X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/0b4e3aa066abc0728aacb4bbeb86f53f9737156e..4d15aeb193b2c68f1d38666c317f8d3734f5f083:/bsd/vfs/vfs_cluster.c?ds=inline
diff --git a/bsd/vfs/vfs_cluster.c b/bsd/vfs/vfs_cluster.c
index 763ecc533..70eecc5ff 100644
--- a/bsd/vfs/vfs_cluster.c
+++ b/bsd/vfs/vfs_cluster.c
@@ -1,23 +1,29 @@
/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2014 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
@@ -56,2935 +62,6899 @@
*/
#include <sys/param.h>
-#include <sys/proc.h>
-#include <sys/buf.h>
-#include <sys/vnode.h>
-#include <sys/mount.h>
+#include <sys/proc_internal.h>
+#include <sys/buf_internal.h>
+#include <sys/mount_internal.h>
+#include <sys/vnode_internal.h>
#include <sys/trace.h>
#include <sys/malloc.h>
+#include <sys/time.h>
+#include <sys/kernel.h>
#include <sys/resourcevar.h>
+#include <miscfs/specfs/specdev.h>
+#include <sys/uio_internal.h>
#include <libkern/libkern.h>
+#include <machine/machine_routines.h>
-#include <sys/ubc.h>
-#include <vm/vm_pageout.h>
-
-#include <sys/kdebug.h>
-
-#define CL_READ 0x01
-#define CL_ASYNC 0x02
-#define CL_COMMIT 0x04
-#define CL_NOMAP 0x08
-#define CL_PAGEOUT 0x10
-#define CL_AGE 0x20
-#define CL_DUMP 0x40
-#define CL_NOZERO 0x80
-#define CL_PAGEIN 0x100
-#define CL_DEV_MEMORY 0x200
-
-/*
- * throttle the number of async writes that
- * can be outstanding on a single vnode
- * before we issue a synchronous write
- */
-#define ASYNC_THROTTLE 6
+#include <sys/ubc_internal.h>
+#include <vm/vnode_pager.h>
-static int
-cluster_iodone(bp)
- struct buf *bp;
-{
- int b_flags;
- int error;
- int total_size;
- int total_resid;
- int upl_offset;
- upl_t upl;
- struct buf *cbp;
- struct buf *cbp_head;
- struct buf *cbp_next;
- struct buf *real_bp;
- struct vnode *vp;
- int commit_size;
- int pg_offset;
-
-
- cbp_head = (struct buf *)(bp->b_trans_head);
+#include <mach/mach_types.h>
+#include <mach/memory_object_types.h>
+#include <mach/vm_map.h>
+#include <mach/upl.h>
+#include <kern/task.h>
+#include <kern/policy_internal.h>
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_START,
- cbp_head, bp->b_lblkno, bp->b_bcount, bp->b_flags, 0);
+#include <vm/vm_kern.h>
+#include <vm/vm_map.h>
+#include <vm/vm_pageout.h>
+#include <vm/vm_fault.h>
- for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next) {
- /*
- * all I/O requests that are part of this transaction
- * have to complete before we can process it
- */
- if ( !(cbp->b_flags & B_DONE)) {
+#include <sys/kdebug.h>
+#include <libkern/OSAtomic.h>
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
- cbp_head, cbp, cbp->b_bcount, cbp->b_flags, 0);
+#include <sys/sdt.h>
- return 0;
- }
- }
- error = 0;
- total_size = 0;
- total_resid = 0;
+#include <stdbool.h>
- cbp = cbp_head;
- upl_offset = cbp->b_uploffset;
- upl = cbp->b_pagelist;
- b_flags = cbp->b_flags;
- real_bp = cbp->b_real_bp;
- vp = cbp->b_vp;
+#if 0
+#undef KERNEL_DEBUG
+#define KERNEL_DEBUG KERNEL_DEBUG_CONSTANT
+#endif
- while (cbp) {
- if (cbp->b_vectorcount > 1)
- _FREE(cbp->b_vectorlist, M_SEGMENT);
- if ((cbp->b_flags & B_ERROR) && error == 0)
- error = cbp->b_error;
+#define CL_READ 0x01
+#define CL_WRITE 0x02
+#define CL_ASYNC 0x04
+#define CL_COMMIT 0x08
+#define CL_PAGEOUT 0x10
+#define CL_AGE 0x20
+#define CL_NOZERO 0x40
+#define CL_PAGEIN 0x80
+#define CL_DEV_MEMORY 0x100
+#define CL_PRESERVE 0x200
+#define CL_THROTTLE 0x400
+#define CL_KEEPCACHED 0x800
+#define CL_DIRECT_IO 0x1000
+#define CL_PASSIVE 0x2000
+#define CL_IOSTREAMING 0x4000
+#define CL_CLOSE 0x8000
+#define CL_ENCRYPTED 0x10000
+#define CL_RAW_ENCRYPTED 0x20000
+#define CL_NOCACHE 0x40000
- total_resid += cbp->b_resid;
- total_size += cbp->b_bcount;
+#define MAX_VECTOR_UPL_ELEMENTS 8
+#define MAX_VECTOR_UPL_SIZE (2 * MAX_UPL_SIZE_BYTES)
- cbp_next = cbp->b_trans_next;
+#define CLUSTER_IO_WAITING ((buf_t)1)
- free_io_buf(cbp);
+extern upl_t vector_upl_create(vm_offset_t);
+extern boolean_t vector_upl_is_valid(upl_t);
+extern boolean_t vector_upl_set_subupl(upl_t,upl_t, u_int32_t);
+extern void vector_upl_set_pagelist(upl_t);
+extern void vector_upl_set_iostate(upl_t, upl_t, vm_offset_t, u_int32_t);
- cbp = cbp_next;
- }
- if ((vp->v_flag & VTHROTTLED) && (vp->v_numoutput <= (ASYNC_THROTTLE / 3))) {
- vp->v_flag &= ~VTHROTTLED;
- wakeup((caddr_t)&vp->v_numoutput);
- }
- if ((b_flags & B_NEED_IODONE) && real_bp) {
- if (error) {
- real_bp->b_flags |= B_ERROR;
- real_bp->b_error = error;
- }
- real_bp->b_resid = total_resid;
+struct clios {
+ lck_mtx_t io_mtxp;
+ u_int io_completed; /* amount of io that has currently completed */
+ u_int io_issued; /* amount of io that was successfully issued */
+ int io_error; /* error code of first error encountered */
+ int io_wanted; /* someone is sleeping waiting for a change in state */
+};
- biodone(real_bp);
- }
- if (error == 0 && total_resid)
- error = EIO;
+struct cl_direct_read_lock {
+ LIST_ENTRY(cl_direct_read_lock) chain;
+ int32_t ref_count;
+ vnode_t vp;
+ lck_rw_t rw_lock;
+};
- if (b_flags & B_COMMIT_UPL) {
- pg_offset = upl_offset & PAGE_MASK;
- commit_size = (((pg_offset + total_size) + (PAGE_SIZE - 1)) / PAGE_SIZE) * PAGE_SIZE;
+#define CL_DIRECT_READ_LOCK_BUCKETS 61
- if (error || (b_flags & B_NOCACHE)) {
- int upl_abort_code;
+static LIST_HEAD(cl_direct_read_locks, cl_direct_read_lock)
+ cl_direct_read_locks[CL_DIRECT_READ_LOCK_BUCKETS];
- if (b_flags & B_PAGEOUT)
- upl_abort_code = UPL_ABORT_FREE_ON_EMPTY;
- else if (b_flags & B_PGIN)
- upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR;
- else
- upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_DUMP_PAGES;
+static lck_spin_t cl_direct_read_spin_lock;
- ubc_upl_abort_range(upl, upl_offset - pg_offset, commit_size,
- upl_abort_code);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
- upl, upl_offset - pg_offset, commit_size,
- 0x80000000|upl_abort_code, 0);
+static lck_grp_t *cl_mtx_grp;
+static lck_attr_t *cl_mtx_attr;
+static lck_grp_attr_t *cl_mtx_grp_attr;
+static lck_mtx_t *cl_transaction_mtxp;
- } else {
- int upl_commit_flags = UPL_COMMIT_FREE_ON_EMPTY;
+#define IO_UNKNOWN 0
+#define IO_DIRECT 1
+#define IO_CONTIG 2
+#define IO_COPY 3
- if ( !(b_flags & B_PAGEOUT))
- upl_commit_flags |= UPL_COMMIT_CLEAR_DIRTY;
- if (b_flags & B_AGE)
- upl_commit_flags |= UPL_COMMIT_INACTIVATE;
+#define PUSH_DELAY 0x01
+#define PUSH_ALL 0x02
+#define PUSH_SYNC 0x04
- ubc_upl_commit_range(upl, upl_offset - pg_offset, commit_size,
- upl_commit_flags);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
- upl, upl_offset - pg_offset, commit_size,
- upl_commit_flags, 0);
- }
- } else
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
- upl, upl_offset, 0, error, 0);
+static void cluster_EOT(buf_t cbp_head, buf_t cbp_tail, int zero_offset);
+static void cluster_wait_IO(buf_t cbp_head, int async);
+static void cluster_complete_transaction(buf_t *cbp_head, void *callback_arg, int *retval, int flags, int needwait);
- return (error);
-}
+static int cluster_io_type(struct uio *uio, int *io_type, u_int32_t *io_length, u_int32_t min_length);
+static int cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int non_rounded_size,
+ int flags, buf_t real_bp, struct clios *iostate, int (*)(buf_t, void *), void *callback_arg);
+static int cluster_iodone(buf_t bp, void *callback_arg);
+static int cluster_ioerror(upl_t upl, int upl_offset, int abort_size, int error, int io_flags, vnode_t vp);
+static int cluster_is_throttled(vnode_t vp);
-static void
-cluster_zero(upl, upl_offset, size, flags, bp)
- upl_t upl;
- vm_offset_t upl_offset;
- int size;
- int flags;
- struct buf *bp;
-{
- vm_offset_t io_addr = 0;
- kern_return_t kret;
-
- if ( !(flags & CL_NOMAP)) {
- kret = ubc_upl_map(upl, &io_addr);
-
- if (kret != KERN_SUCCESS)
- panic("cluster_zero: ubc_upl_map() failed with (%d)", kret);
- if (io_addr == 0)
- panic("cluster_zero: ubc_upl_map() mapped 0");
- } else
- io_addr = (vm_offset_t)bp->b_data;
- bzero((caddr_t)(io_addr + upl_offset), size);
-
- if ( !(flags & CL_NOMAP)) {
- kret = ubc_upl_unmap(upl);
+static void cluster_iostate_wait(struct clios *iostate, u_int target, const char *wait_name);
- if (kret != KERN_SUCCESS)
- panic("cluster_zero: kernel_upl_unmap failed");
- }
-}
+static void cluster_syncup(vnode_t vp, off_t newEOF, int (*)(buf_t, void *), void *callback_arg, int flags);
-static int
-cluster_io(vp, upl, upl_offset, f_offset, size, flags, real_bp)
- struct vnode *vp;
- upl_t upl;
- vm_offset_t upl_offset;
- off_t f_offset;
- int size;
- int flags;
- struct buf *real_bp;
-{
- struct buf *cbp;
- struct iovec *iovp;
- int io_flags;
- int error = 0;
- int retval = 0;
- struct buf *cbp_head = 0;
- struct buf *cbp_tail = 0;
- upl_page_info_t *pl;
- int pg_count;
- int pg_offset;
- int max_iosize;
- int max_vectors;
- int priv;
+static void cluster_read_upl_release(upl_t upl, int start_pg, int last_pg, int take_reference);
+static int cluster_copy_ubc_data_internal(vnode_t vp, struct uio *uio, int *io_resid, int mark_dirty, int take_reference);
- if (flags & CL_READ) {
- io_flags = (B_VECTORLIST | B_READ);
+static int cluster_read_copy(vnode_t vp, struct uio *uio, u_int32_t io_req_size, off_t filesize, int flags,
+ int (*)(buf_t, void *), void *callback_arg);
+static int cluster_read_direct(vnode_t vp, struct uio *uio, off_t filesize, int *read_type, u_int32_t *read_length,
+ int flags, int (*)(buf_t, void *), void *callback_arg);
+static int cluster_read_contig(vnode_t vp, struct uio *uio, off_t filesize, int *read_type, u_int32_t *read_length,
+ int (*)(buf_t, void *), void *callback_arg, int flags);
- vfs_io_attributes(vp, B_READ, &max_iosize, &max_vectors);
- } else {
- io_flags = (B_VECTORLIST | B_WRITEINPROG);
+static int cluster_write_copy(vnode_t vp, struct uio *uio, u_int32_t io_req_size, off_t oldEOF, off_t newEOF,
+ off_t headOff, off_t tailOff, int flags, int (*)(buf_t, void *), void *callback_arg);
+static int cluster_write_direct(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF,
+ int *write_type, u_int32_t *write_length, int flags, int (*)(buf_t, void *), void *callback_arg);
+static int cluster_write_contig(vnode_t vp, struct uio *uio, off_t newEOF,
+ int *write_type, u_int32_t *write_length, int (*)(buf_t, void *), void *callback_arg, int bflag);
+
+static int cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, u_int32_t xsize, int flags, int (*)(buf_t, void *), void *callback_arg);
+
+static int cluster_read_prefetch(vnode_t vp, off_t f_offset, u_int size, off_t filesize, int (*callback)(buf_t, void *), void *callback_arg, int bflag);
+static void cluster_read_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl_readahead *ra, int (*callback)(buf_t, void *), void *callback_arg, int bflag);
- vfs_io_attributes(vp, B_WRITE, &max_iosize, &max_vectors);
- }
- pl = ubc_upl_pageinfo(upl);
+static int cluster_push_now(vnode_t vp, struct cl_extent *, off_t EOF, int flags, int (*)(buf_t, void *), void *callback_arg);
- if (flags & CL_ASYNC)
- io_flags |= (B_CALL | B_ASYNC);
- if (flags & CL_AGE)
- io_flags |= B_AGE;
- if (flags & CL_DUMP)
- io_flags |= B_NOCACHE;
- if (flags & CL_PAGEIN)
- io_flags |= B_PGIN;
+static int cluster_try_push(struct cl_writebehind *, vnode_t vp, off_t EOF, int push_flag, int flags, int (*)(buf_t, void *), void *callback_arg, int *err);
+static void sparse_cluster_switch(struct cl_writebehind *, vnode_t vp, off_t EOF, int (*)(buf_t, void *), void *callback_arg);
+static int sparse_cluster_push(void **cmapp, vnode_t vp, off_t EOF, int push_flag, int io_flags, int (*)(buf_t, void *), void *callback_arg);
+static void sparse_cluster_add(void **cmapp, vnode_t vp, struct cl_extent *, off_t EOF, int (*)(buf_t, void *), void *callback_arg);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_START,
- (int)f_offset, size, upl_offset, flags, 0);
+static kern_return_t vfs_drt_mark_pages(void **cmapp, off_t offset, u_int length, u_int *setcountp);
+static kern_return_t vfs_drt_get_cluster(void **cmapp, off_t *offsetp, u_int *lengthp);
+static kern_return_t vfs_drt_control(void **cmapp, int op_type);
- if ((flags & CL_READ) && ((upl_offset + size) & PAGE_MASK) && (!(flags & CL_NOZERO))) {
- /*
- * then we are going to end up
- * with a page that we can't complete (the file size wasn't a multiple
- * of PAGE_SIZE and we're trying to read to the end of the file
- * so we'll go ahead and zero out the portion of the page we can't
- * read in from the file
- */
- cluster_zero(upl, upl_offset + size, PAGE_SIZE - ((upl_offset + size) & PAGE_MASK), flags, real_bp);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 23)) | DBG_FUNC_NONE,
- upl_offset + size, PAGE_SIZE - ((upl_offset + size) & PAGE_MASK),
- flags, real_bp, 0);
- }
- while (size) {
- size_t io_size;
- int vsize;
- int i;
- int pl_index;
- int pg_resid;
- int num_contig;
- daddr_t lblkno;
- daddr_t blkno;
+/*
+ * For throttled IO to check whether
+ * a block is cached by the boot cache
+ * and thus it can avoid delaying the IO.
+ *
+ * bootcache_contains_block is initially
+ * NULL. The BootCache will set it while
+ * the cache is active and clear it when
+ * the cache is jettisoned.
+ *
+ * Returns 0 if the block is not
+ * contained in the cache, 1 if it is
+ * contained.
+ *
+ * The function pointer remains valid
+ * after the cache has been evicted even
+ * if bootcache_contains_block has been
+ * cleared.
+ *
+ * See rdar://9974130 The new throttling mechanism breaks the boot cache for throttled IOs
+ */
+int (*bootcache_contains_block)(dev_t device, u_int64_t blkno) = NULL;
- if (size > max_iosize)
- io_size = max_iosize;
- else
- io_size = size;
- if (error = VOP_CMAP(vp, f_offset, io_size, &blkno, &io_size, NULL)) {
- if (error == EOPNOTSUPP)
- panic("VOP_CMAP Unimplemented");
- break;
- }
+/*
+ * limit the internal I/O size so that we
+ * can represent it in a 32 bit int
+ */
+#define MAX_IO_REQUEST_SIZE (1024 * 1024 * 512)
+#define MAX_IO_CONTIG_SIZE MAX_UPL_SIZE_BYTES
+#define MAX_VECTS 16
+/*
+ * The MIN_DIRECT_WRITE_SIZE governs how much I/O should be issued before we consider
+ * allowing the caller to bypass the buffer cache. For small I/Os (less than 16k),
+ * we have not historically allowed the write to bypass the UBC.
+ */
+#define MIN_DIRECT_WRITE_SIZE (16384)
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 24)) | DBG_FUNC_NONE,
- (int)f_offset, (int)blkno, io_size, 0, 0);
+#define WRITE_THROTTLE 6
+#define WRITE_THROTTLE_SSD 2
+#define WRITE_BEHIND 1
+#define WRITE_BEHIND_SSD 1
- if ( (!(flags & CL_READ) && (long)blkno == -1) || io_size == 0) {
- if (flags & CL_PAGEOUT) {
- error = EINVAL;
- break;
- };
-
- /* Try paging out the page individually before
- giving up entirely and dumping it (it could
- be mapped in a "hole" and require allocation
- before the I/O:
- */
- ubc_upl_abort_range(upl, upl_offset, PAGE_SIZE_64, UPL_ABORT_FREE_ON_EMPTY);
- if (ubc_pushdirty_range(vp, f_offset, PAGE_SIZE_64) == 0) {
- error = EINVAL;
- break;
- };
-
- upl_offset += PAGE_SIZE_64;
- f_offset += PAGE_SIZE_64;
- size -= PAGE_SIZE_64;
- continue;
- }
- lblkno = (daddr_t)(f_offset / PAGE_SIZE_64);
- /*
- * we have now figured out how much I/O we can do - this is in 'io_size'
- * pl_index represents the first page in the 'upl' that the I/O will occur for
- * pg_offset is the starting point in the first page for the I/O
- * pg_count is the number of full and partial pages that 'io_size' encompasses
- */
- pl_index = upl_offset / PAGE_SIZE;
- pg_offset = upl_offset & PAGE_MASK;
- pg_count = (io_size + pg_offset + (PAGE_SIZE - 1)) / PAGE_SIZE;
+#define PREFETCH 3
+#define PREFETCH_SSD 2
+uint32_t speculative_prefetch_max = (MAX_UPL_SIZE_BYTES * 3); /* maximum bytes in a specluative read-ahead */
+uint32_t speculative_prefetch_max_iosize = (512 * 1024); /* maximum I/O size to use in a specluative read-ahead on SSDs*/
- if (flags & CL_DEV_MEMORY) {
- /*
- * currently, can't deal with reading 'holes' in file
- */
- if ((long)blkno == -1) {
- error = EINVAL;
- break;
- }
- /*
- * treat physical requests as one 'giant' page
- */
- pg_count = 1;
- }
- if ((flags & CL_READ) && (long)blkno == -1) {
- /*
- * if we're reading and blkno == -1, then we've got a
- * 'hole' in the file that we need to deal with by zeroing
- * out the affected area in the upl
- */
- cluster_zero(upl, upl_offset, io_size, flags, real_bp);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 23)) | DBG_FUNC_NONE,
- upl_offset, io_size, flags, real_bp, 0);
+#define IO_SCALE(vp, base) (vp->v_mount->mnt_ioscale * (base))
+#define MAX_CLUSTER_SIZE(vp) (cluster_max_io_size(vp->v_mount, CL_WRITE))
+#define MAX_PREFETCH(vp, size, is_ssd) (size * IO_SCALE(vp, ((is_ssd && !ignore_is_ssd) ? PREFETCH_SSD : PREFETCH)))
- pg_count = (io_size - pg_offset) / PAGE_SIZE;
+int ignore_is_ssd = 0;
+int speculative_reads_disabled = 0;
- if (io_size == size && ((upl_offset + io_size) & PAGE_MASK))
- pg_count++;
+/*
+ * throttle the number of async writes that
+ * can be outstanding on a single vnode
+ * before we issue a synchronous write
+ */
+#define THROTTLE_MAXCNT 0
- if (pg_count) {
- if (pg_offset)
- pg_resid = PAGE_SIZE - pg_offset;
- else
- pg_resid = 0;
- if (flags & CL_COMMIT)
- ubc_upl_commit_range(upl,
- upl_offset + pg_resid,
- pg_count * PAGE_SIZE,
- UPL_COMMIT_CLEAR_DIRTY | UPL_COMMIT_FREE_ON_EMPTY);
- }
- upl_offset += io_size;
- f_offset += io_size;
- size -= io_size;
+uint32_t throttle_max_iosize = (128 * 1024);
- if (cbp_head && pg_count)
- goto start_io;
- continue;
- } else if (real_bp && (real_bp->b_blkno == real_bp->b_lblkno)) {
- real_bp->b_blkno = blkno;
- }
+#define THROTTLE_MAX_IOSIZE (throttle_max_iosize)
- if (pg_count > 1) {
- if (pg_count > max_vectors) {
- io_size -= (pg_count - max_vectors) * PAGE_SIZE;
+SYSCTL_INT(_debug, OID_AUTO, lowpri_throttle_max_iosize, CTLFLAG_RW | CTLFLAG_LOCKED, &throttle_max_iosize, 0, "");
- if (io_size < 0) {
- io_size = PAGE_SIZE - pg_offset;
- pg_count = 1;
- } else
- pg_count = max_vectors;
- }
- /*
- * we need to allocate space for the vector list
- */
- if (pg_count > 1) {
- iovp = (struct iovec *)_MALLOC(sizeof(struct iovec) * pg_count,
- M_SEGMENT, M_NOWAIT);
-
- if (iovp == (struct iovec *) 0) {
- /*
- * if the allocation fails, then throttle down to a single page
- */
- io_size = PAGE_SIZE - pg_offset;
- pg_count = 1;
- }
- }
- }
- /* Throttle the speculative IO */
- if ((flags & CL_ASYNC) && !(flags & CL_PAGEOUT))
- priv = 0;
- else
- priv = 1;
+void
+cluster_init(void) {
+ /*
+ * allocate lock group attribute and group
+ */
+ cl_mtx_grp_attr = lck_grp_attr_alloc_init();
+ cl_mtx_grp = lck_grp_alloc_init("cluster I/O", cl_mtx_grp_attr);
+
+ /*
+ * allocate the lock attribute
+ */
+ cl_mtx_attr = lck_attr_alloc_init();
- cbp = alloc_io_buf(vp, priv);
+ cl_transaction_mtxp = lck_mtx_alloc_init(cl_mtx_grp, cl_mtx_attr);
- if (pg_count == 1)
- /*
- * we use the io vector that's reserved in the buffer header
- * this insures we can always issue an I/O even in a low memory
- * condition that prevents the _MALLOC from succeeding... this
- * is necessary to prevent deadlocks with the pager
- */
- iovp = (struct iovec *)(&cbp->b_vects[0]);
+ if (cl_transaction_mtxp == NULL)
+ panic("cluster_init: failed to allocate cl_transaction_mtxp");
- cbp->b_vectorlist = (void *)iovp;
- cbp->b_vectorcount = pg_count;
+ lck_spin_init(&cl_direct_read_spin_lock, cl_mtx_grp, cl_mtx_attr);
- if (flags & CL_DEV_MEMORY) {
+ for (int i = 0; i < CL_DIRECT_READ_LOCK_BUCKETS; ++i)
+ LIST_INIT(&cl_direct_read_locks[i]);
+}
- iovp->iov_len = io_size;
- iovp->iov_base = (caddr_t)upl_phys_page(pl, 0);
- if (iovp->iov_base == (caddr_t) 0) {
- free_io_buf(cbp);
- error = EINVAL;
- } else
- iovp->iov_base += upl_offset;
- } else {
+uint32_t
+cluster_max_io_size(mount_t mp, int type)
+{
+ uint32_t max_io_size;
+ uint32_t segcnt;
+ uint32_t maxcnt;
- for (i = 0, vsize = io_size; i < pg_count; i++, iovp++) {
- int psize;
+ switch(type) {
- psize = PAGE_SIZE - pg_offset;
+ case CL_READ:
+ segcnt = mp->mnt_segreadcnt;
+ maxcnt = mp->mnt_maxreadcnt;
+ break;
+ case CL_WRITE:
+ segcnt = mp->mnt_segwritecnt;
+ maxcnt = mp->mnt_maxwritecnt;
+ break;
+ default:
+ segcnt = min(mp->mnt_segreadcnt, mp->mnt_segwritecnt);
+ maxcnt = min(mp->mnt_maxreadcnt, mp->mnt_maxwritecnt);
+ break;
+ }
+ if (segcnt > (MAX_UPL_SIZE_BYTES >> PAGE_SHIFT)) {
+ /*
+ * don't allow a size beyond the max UPL size we can create
+ */
+ segcnt = MAX_UPL_SIZE_BYTES >> PAGE_SHIFT;
+ }
+ max_io_size = min((segcnt * PAGE_SIZE), maxcnt);
+
+ if (max_io_size < MAX_UPL_TRANSFER_BYTES) {
+ /*
+ * don't allow a size smaller than the old fixed limit
+ */
+ max_io_size = MAX_UPL_TRANSFER_BYTES;
+ } else {
+ /*
+ * make sure the size specified is a multiple of PAGE_SIZE
+ */
+ max_io_size &= ~PAGE_MASK;
+ }
+ return (max_io_size);
+}
- if (psize > vsize)
- psize = vsize;
- iovp->iov_len = psize;
- iovp->iov_base = (caddr_t)upl_phys_page(pl, pl_index + i);
- if (iovp->iov_base == (caddr_t) 0) {
- if (pg_count > 1)
- _FREE(cbp->b_vectorlist, M_SEGMENT);
- free_io_buf(cbp);
- error = EINVAL;
- break;
- }
- iovp->iov_base += pg_offset;
- pg_offset = 0;
+#define CLW_ALLOCATE 0x01
+#define CLW_RETURNLOCKED 0x02
+#define CLW_IONOCACHE 0x04
+#define CLW_IOPASSIVE 0x08
- if (flags & CL_PAGEOUT) {
- int s;
- struct buf *bp;
-
- s = splbio();
- if (bp = incore(vp, lblkno + i)) {
- if (!ISSET(bp->b_flags, B_BUSY)) {
- bremfree(bp);
- SET(bp->b_flags, (B_BUSY | B_INVAL));
- splx(s);
- brelse(bp);
- } else
- panic("BUSY bp found in cluster_io");
- }
- splx(s);
- }
- vsize -= psize;
- }
- }
- if (error)
- break;
+/*
+ * if the read ahead context doesn't yet exist,
+ * allocate and initialize it...
+ * the vnode lock serializes multiple callers
+ * during the actual assignment... first one
+ * to grab the lock wins... the other callers
+ * will release the now unnecessary storage
+ *
+ * once the context is present, try to grab (but don't block on)
+ * the lock associated with it... if someone
+ * else currently owns it, than the read
+ * will run without read-ahead. this allows
+ * multiple readers to run in parallel and
+ * since there's only 1 read ahead context,
+ * there's no real loss in only allowing 1
+ * reader to have read-ahead enabled.
+ */
+static struct cl_readahead *
+cluster_get_rap(vnode_t vp)
+{
+ struct ubc_info *ubc;
+ struct cl_readahead *rap;
- if (flags & CL_ASYNC)
- cbp->b_iodone = (void *)cluster_iodone;
- cbp->b_flags |= io_flags;
+ ubc = vp->v_ubcinfo;
- cbp->b_lblkno = lblkno;
- cbp->b_blkno = blkno;
- cbp->b_bcount = io_size;
- cbp->b_pagelist = upl;
- cbp->b_uploffset = upl_offset;
- cbp->b_trans_next = (struct buf *)0;
+ if ((rap = ubc->cl_rahead) == NULL) {
+ MALLOC_ZONE(rap, struct cl_readahead *, sizeof *rap, M_CLRDAHEAD, M_WAITOK);
- if (flags & CL_READ)
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 26)) | DBG_FUNC_NONE,
- cbp->b_lblkno, cbp->b_blkno, upl_offset, io_size, 0);
- else
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 27)) | DBG_FUNC_NONE,
- cbp->b_lblkno, cbp->b_blkno, upl_offset, io_size, 0);
+ bzero(rap, sizeof *rap);
+ rap->cl_lastr = -1;
+ lck_mtx_init(&rap->cl_lockr, cl_mtx_grp, cl_mtx_attr);
- if (cbp_head) {
- cbp_tail->b_trans_next = cbp;
- cbp_tail = cbp;
- } else {
- cbp_head = cbp;
- cbp_tail = cbp;
+ vnode_lock(vp);
+
+ if (ubc->cl_rahead == NULL)
+ ubc->cl_rahead = rap;
+ else {
+ lck_mtx_destroy(&rap->cl_lockr, cl_mtx_grp);
+ FREE_ZONE((void *)rap, sizeof *rap, M_CLRDAHEAD);
+ rap = ubc->cl_rahead;
}
- (struct buf *)(cbp->b_trans_head) = cbp_head;
+ vnode_unlock(vp);
+ }
+ if (lck_mtx_try_lock(&rap->cl_lockr) == TRUE)
+ return(rap);
+
+ return ((struct cl_readahead *)NULL);
+}
- upl_offset += io_size;
- f_offset += io_size;
- size -= io_size;
- if ( (!(upl_offset & PAGE_MASK) && !(flags & CL_DEV_MEMORY)) || size == 0) {
- /*
- * if we have no more I/O to issue or
- * the current I/O we've prepared fully
- * completes the last page in this request
- * or it's been completed via a zero-fill
- * due to a 'hole' in the file
- * then go ahead and issue the I/O
- */
-start_io:
- if (flags & CL_COMMIT)
- cbp_head->b_flags |= B_COMMIT_UPL;
- if (flags & CL_PAGEOUT)
- cbp_head->b_flags |= B_PAGEOUT;
- if (flags & CL_PAGEIN)
- cbp_head->b_flags |= B_PGIN;
+/*
+ * if the write behind context doesn't yet exist,
+ * and CLW_ALLOCATE is specified, allocate and initialize it...
+ * the vnode lock serializes multiple callers
+ * during the actual assignment... first one
+ * to grab the lock wins... the other callers
+ * will release the now unnecessary storage
+ *
+ * if CLW_RETURNLOCKED is set, grab (blocking if necessary)
+ * the lock associated with the write behind context before
+ * returning
+ */
- if (real_bp) {
- cbp_head->b_flags |= B_NEED_IODONE;
- cbp_head->b_real_bp = real_bp;
- }
+static struct cl_writebehind *
+cluster_get_wbp(vnode_t vp, int flags)
+{
+ struct ubc_info *ubc;
+ struct cl_writebehind *wbp;
- for (cbp = cbp_head; cbp;) {
- struct buf * cbp_next;
+ ubc = vp->v_ubcinfo;
- if (io_flags & B_WRITEINPROG)
- cbp->b_vp->v_numoutput++;
+ if ((wbp = ubc->cl_wbehind) == NULL) {
- cbp_next = cbp->b_trans_next;
+ if ( !(flags & CLW_ALLOCATE))
+ return ((struct cl_writebehind *)NULL);
+
+ MALLOC_ZONE(wbp, struct cl_writebehind *, sizeof *wbp, M_CLWRBEHIND, M_WAITOK);
- (void) VOP_STRATEGY(cbp);
- cbp = cbp_next;
- }
- if ( !(flags & CL_ASYNC)) {
- for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next)
- biowait(cbp);
+ bzero(wbp, sizeof *wbp);
+ lck_mtx_init(&wbp->cl_lockw, cl_mtx_grp, cl_mtx_attr);
- if (error = cluster_iodone(cbp_head)) {
- retval = error;
- error = 0;
- }
- }
- cbp_head = (struct buf *)0;
- cbp_tail = (struct buf *)0;
+ vnode_lock(vp);
+
+ if (ubc->cl_wbehind == NULL)
+ ubc->cl_wbehind = wbp;
+ else {
+ lck_mtx_destroy(&wbp->cl_lockw, cl_mtx_grp);
+ FREE_ZONE((void *)wbp, sizeof *wbp, M_CLWRBEHIND);
+ wbp = ubc->cl_wbehind;
}
+ vnode_unlock(vp);
}
- if (error) {
- int abort_size;
-
- for (cbp = cbp_head; cbp;) {
- struct buf * cbp_next;
-
- if (cbp->b_vectorcount > 1)
- _FREE(cbp->b_vectorlist, M_SEGMENT);
- upl_offset -= cbp->b_bcount;
- size += cbp->b_bcount;
+ if (flags & CLW_RETURNLOCKED)
+ lck_mtx_lock(&wbp->cl_lockw);
- cbp_next = cbp->b_trans_next;
- free_io_buf(cbp);
- cbp = cbp_next;
- }
- pg_offset = upl_offset & PAGE_MASK;
- abort_size = ((size + pg_offset + (PAGE_SIZE - 1)) / PAGE_SIZE) * PAGE_SIZE;
+ return (wbp);
+}
- if (flags & CL_COMMIT) {
- int upl_abort_code;
- if (flags & CL_PAGEOUT)
- upl_abort_code = UPL_ABORT_FREE_ON_EMPTY;
- else if (flags & CL_PAGEIN)
- upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR;
- else
- upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_DUMP_PAGES;
+static void
+cluster_syncup(vnode_t vp, off_t newEOF, int (*callback)(buf_t, void *), void *callback_arg, int flags)
+{
+ struct cl_writebehind *wbp;
- ubc_upl_abort_range(upl, upl_offset - pg_offset, abort_size,
- upl_abort_code);
+ if ((wbp = cluster_get_wbp(vp, 0)) != NULL) {
+
+ if (wbp->cl_number) {
+ lck_mtx_lock(&wbp->cl_lockw);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 28)) | DBG_FUNC_NONE,
- upl, upl_offset - pg_offset, abort_size, error, 0);
- }
- if (real_bp) {
- real_bp->b_flags |= B_ERROR;
- real_bp->b_error = error;
+ cluster_try_push(wbp, vp, newEOF, PUSH_ALL | flags, 0, callback, callback_arg, NULL);
- biodone(real_bp);
+ lck_mtx_unlock(&wbp->cl_lockw);
}
- if (retval == 0)
- retval = error;
}
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_END,
- (int)f_offset, size, upl_offset, retval, 0);
-
- return (retval);
}
static int
-cluster_rd_prefetch(vp, f_offset, size, filesize, devblocksize)
- struct vnode *vp;
- off_t f_offset;
- u_int size;
- off_t filesize;
- int devblocksize;
-{
- upl_t upl;
- upl_page_info_t *pl;
- int pages_in_upl;
- int start_pg;
- int last_pg;
- int last_valid;
- int io_size;
-
+cluster_io_present_in_BC(vnode_t vp, off_t f_offset)
+{
+ daddr64_t blkno;
+ size_t io_size;
+ int (*bootcache_check_fn)(dev_t device, u_int64_t blkno) = bootcache_contains_block;
+
+ if (bootcache_check_fn) {
+ if (VNOP_BLOCKMAP(vp, f_offset, PAGE_SIZE, &blkno, &io_size, NULL, VNODE_READ, NULL))
+ return(0);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_START,
- (int)f_offset, size, (int)filesize, 0, 0);
+ if (io_size == 0)
+ return (0);
- if (f_offset >= filesize) {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_END,
- (int)f_offset, 0, 0, 0, 0);
- return(0);
- }
- if (ubc_page_op(vp, f_offset, 0, 0, 0) == KERN_SUCCESS) {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_END,
- (int)f_offset, 0, 0, 0, 0);
- return(0);
+ if (bootcache_check_fn(vp->v_mount->mnt_devvp->v_rdev, blkno))
+ return(1);
}
- if (size > (MAX_UPL_TRANSFER * PAGE_SIZE))
- size = MAX_UPL_TRANSFER * PAGE_SIZE;
- else
- size = (size + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
+ return(0);
+}
- if ((off_t)size > (filesize - f_offset))
- size = ((filesize - f_offset) + (devblocksize - 1)) & ~(devblocksize - 1);
-
- pages_in_upl = (size + (PAGE_SIZE - 1)) / PAGE_SIZE;
- ubc_create_upl(vp,
- f_offset,
- pages_in_upl * PAGE_SIZE,
- &upl,
- &pl,
- UPL_FLAGS_NONE);
+static int
+cluster_is_throttled(vnode_t vp)
+{
+ return (throttle_io_will_be_throttled(-1, vp->v_mount));
+}
- if (upl == (upl_t) 0)
- return(0);
- /*
- * scan from the beginning of the upl looking for the first
- * non-valid page.... this will become the first page in
- * the request we're going to make to 'cluster_io'... if all
- * of the pages are valid, we won't call through to 'cluster_io'
- */
- for (start_pg = 0; start_pg < pages_in_upl; start_pg++) {
- if (!upl_valid_page(pl, start_pg))
- break;
- }
+static void
+cluster_iostate_wait(struct clios *iostate, u_int target, const char *wait_name)
+{
+
+ lck_mtx_lock(&iostate->io_mtxp);
+
+ while ((iostate->io_issued - iostate->io_completed) > target) {
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_START,
+ iostate->io_issued, iostate->io_completed, target, 0, 0);
+
+ iostate->io_wanted = 1;
+ msleep((caddr_t)&iostate->io_wanted, &iostate->io_mtxp, PRIBIO + 1, wait_name, NULL);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_END,
+ iostate->io_issued, iostate->io_completed, target, 0, 0);
+ }
+ lck_mtx_unlock(&iostate->io_mtxp);
+}
+
+static void cluster_handle_associated_upl(struct clios *iostate, upl_t upl,
+ upl_offset_t upl_offset, upl_size_t size)
+{
+ if (!size)
+ return;
+
+ upl_t associated_upl = upl_associated_upl(upl);
+
+ if (!associated_upl)
+ return;
+
+#if 0
+ printf("1: %d %d\n", upl_offset, upl_offset + size);
+#endif
/*
- * scan from the starting invalid page looking for a valid
- * page before the end of the upl is reached, if we
- * find one, then it will be the last page of the request to
- * 'cluster_io'
+ * The associated UPL is page aligned to file offsets whereas the
+ * UPL it's attached to has different alignment requirements. The
+ * upl_offset that we have refers to @upl. The code that follows
+ * has to deal with the first and last pages in this transaction
+ * which might straddle pages in the associated UPL. To keep
+ * track of these pages, we use the mark bits: if the mark bit is
+ * set, we know another transaction has completed its part of that
+ * page and so we can unlock that page here.
+ *
+ * The following illustrates what we have to deal with:
+ *
+ * MEM u <------------ 1 PAGE ------------> e
+ * +-------------+----------------------+-----------------
+ * | |######################|#################
+ * +-------------+----------------------+-----------------
+ * FILE | <--- a ---> o <------------ 1 PAGE ------------>
+ *
+ * So here we show a write to offset @o. The data that is to be
+ * written is in a buffer that is not page aligned; it has offset
+ * @a in the page. The upl that carries the data starts in memory
+ * at @u. The associated upl starts in the file at offset @o. A
+ * transaction will always end on a page boundary (like @e above)
+ * except for the very last transaction in the group. We cannot
+ * unlock the page at @o in the associated upl until both the
+ * transaction ending at @e and the following transaction (that
+ * starts at @e) has completed.
*/
- for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) {
- if (upl_valid_page(pl, last_pg))
- break;
- }
/*
- * if we find any more free valid pages at the tail of the upl
- * than update maxra accordingly....
+ * We record whether or not the two UPLs are aligned as the mark
+ * bit in the first page of @upl.
*/
- for (last_valid = last_pg; last_valid < pages_in_upl; last_valid++) {
- if (!upl_valid_page(pl, last_valid))
- break;
- }
- if (start_pg < last_pg) {
- vm_offset_t upl_offset;
+ upl_page_info_t *pl = UPL_GET_INTERNAL_PAGE_LIST(upl);
+ bool is_unaligned = upl_page_get_mark(pl, 0);
- /*
- * we found a range of 'invalid' pages that must be filled
- * 'size' has already been clipped to the LEOF
- * make sure it's at least a multiple of the device block size
- */
- upl_offset = start_pg * PAGE_SIZE;
- io_size = (last_pg - start_pg) * PAGE_SIZE;
+ if (is_unaligned) {
+ upl_page_info_t *assoc_pl = UPL_GET_INTERNAL_PAGE_LIST(associated_upl);
- if ((upl_offset + io_size) > size) {
- io_size = size - upl_offset;
+ upl_offset_t upl_end = upl_offset + size;
+ assert(upl_end >= PAGE_SIZE);
- KERNEL_DEBUG(0xd001000, upl_offset, size, io_size, 0, 0);
- }
- cluster_io(vp, upl, upl_offset, f_offset + upl_offset, io_size,
- CL_READ | CL_COMMIT | CL_ASYNC | CL_AGE, (struct buf *)0);
- }
- if (start_pg) {
- /*
- * start_pg of non-zero indicates we found some already valid pages
- * at the beginning of the upl.... we need to release these without
- * modifying there state
- */
- ubc_upl_abort_range(upl, 0, start_pg * PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY);
+ upl_size_t assoc_upl_size = upl_get_size(associated_upl);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 50)) | DBG_FUNC_NONE,
- upl, 0, start_pg * PAGE_SIZE, 0, 0);
- }
- if (last_pg < pages_in_upl) {
/*
- * the set of pages that we issued an I/O for did not extend all the
- * way to the end of the upl... so just release them without modifying
- * there state
+ * In the very first transaction in the group, upl_offset will
+ * not be page aligned, but after that it will be and in that
+ * case we want the preceding page in the associated UPL hence
+ * the minus one.
*/
- ubc_upl_abort_range(upl, last_pg * PAGE_SIZE, (pages_in_upl - last_pg) * PAGE_SIZE,
- UPL_ABORT_FREE_ON_EMPTY);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 50)) | DBG_FUNC_NONE,
- upl, last_pg * PAGE_SIZE, (pages_in_upl - last_pg) * PAGE_SIZE, 0, 0);
- }
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_END,
- (int)f_offset + (last_valid * PAGE_SIZE), 0, 0, 0, 0);
+ assert(upl_offset);
+ if (upl_offset)
+ upl_offset = trunc_page_32(upl_offset - 1);
- return(last_valid);
-}
+ lck_mtx_lock_spin(&iostate->io_mtxp);
+ // Look at the first page...
+ if (upl_offset
+ && !upl_page_get_mark(assoc_pl, upl_offset >> PAGE_SHIFT)) {
+ /*
+ * The first page isn't marked so let another transaction
+ * completion handle it.
+ */
+ upl_page_set_mark(assoc_pl, upl_offset >> PAGE_SHIFT, true);
+ upl_offset += PAGE_SIZE;
+ }
+ // And now the last page...
-static void
-cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize)
- struct vnode *vp;
- daddr_t b_lblkno;
- daddr_t e_lblkno;
- off_t filesize;
- int devblocksize;
-{
- daddr_t r_lblkno;
- off_t f_offset;
- int size_of_prefetch;
- int max_iosize;
- int max_pages;
+ /*
+ * This needs to be > rather than >= because if it's equal, it
+ * means there's another transaction that is sharing the last
+ * page.
+ */
+ if (upl_end > assoc_upl_size)
+ upl_end = assoc_upl_size;
+ else {
+ upl_end = trunc_page_32(upl_end);
+ const int last_pg = (upl_end >> PAGE_SHIFT) - 1;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_START,
- b_lblkno, e_lblkno, vp->v_lastr, 0, 0);
+ if (!upl_page_get_mark(assoc_pl, last_pg)) {
+ /*
+ * The last page isn't marked so mark the page and let another
+ * transaction completion handle it.
+ */
+ upl_page_set_mark(assoc_pl, last_pg, true);
+ upl_end -= PAGE_SIZE;
+ }
+ }
- if (b_lblkno == vp->v_lastr && b_lblkno == e_lblkno) {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END,
- vp->v_ralen, vp->v_maxra, vp->v_lastr, 0, 0);
- return;
- }
+ lck_mtx_unlock(&iostate->io_mtxp);
- if (vp->v_lastr == -1 || (b_lblkno != vp->v_lastr && b_lblkno != (vp->v_lastr + 1) && b_lblkno != (vp->v_maxra + 1))) {
- vp->v_ralen = 0;
- vp->v_maxra = 0;
+#if 0
+ printf("2: %d %d\n", upl_offset, upl_end);
+#endif
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END,
- vp->v_ralen, vp->v_maxra, vp->v_lastr, 1, 0);
+ if (upl_end <= upl_offset)
+ return;
- return;
+ size = upl_end - upl_offset;
+ } else {
+ assert(!(upl_offset & PAGE_MASK));
+ assert(!(size & PAGE_MASK));
}
- vfs_io_attributes(vp, B_READ, &max_iosize, &max_pages);
-
- if ((max_iosize / PAGE_SIZE) < max_pages)
- max_pages = max_iosize / PAGE_SIZE;
- if (max_pages > MAX_UPL_TRANSFER)
- max_pages = MAX_UPL_TRANSFER;
- vp->v_ralen = vp->v_ralen ? min(max_pages, vp->v_ralen << 1) : 1;
+ boolean_t empty;
- if (((e_lblkno + 1) - b_lblkno) > vp->v_ralen)
- vp->v_ralen = min(max_pages, (e_lblkno + 1) - b_lblkno);
+ /*
+ * We can unlock these pages now and as this is for a
+ * direct/uncached write, we want to dump the pages too.
+ */
+ kern_return_t kr = upl_abort_range(associated_upl, upl_offset, size,
+ UPL_ABORT_DUMP_PAGES, &empty);
- if (e_lblkno < vp->v_maxra) {
- if ((vp->v_maxra - e_lblkno) > (max_pages / 4)) {
+ assert(!kr);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END,
- vp->v_ralen, vp->v_maxra, vp->v_lastr, 2, 0);
- return;
- }
+ if (!kr && empty) {
+ upl_set_associated_upl(upl, NULL);
+ upl_deallocate(associated_upl);
}
- r_lblkno = max(e_lblkno, vp->v_maxra) + 1;
- f_offset = (off_t)r_lblkno * PAGE_SIZE_64;
+}
- size_of_prefetch = cluster_rd_prefetch(vp, f_offset, vp->v_ralen * PAGE_SIZE, filesize, devblocksize);
+static int
+cluster_ioerror(upl_t upl, int upl_offset, int abort_size, int error, int io_flags, vnode_t vp)
+{
+ int upl_abort_code = 0;
+ int page_in = 0;
+ int page_out = 0;
- if (size_of_prefetch)
- vp->v_maxra = r_lblkno + (size_of_prefetch - 1);
+ if ((io_flags & (B_PHYS | B_CACHE)) == (B_PHYS | B_CACHE))
+ /*
+ * direct write of any flavor, or a direct read that wasn't aligned
+ */
+ ubc_upl_commit_range(upl, upl_offset, abort_size, UPL_COMMIT_FREE_ON_EMPTY);
+ else {
+ if (io_flags & B_PAGEIO) {
+ if (io_flags & B_READ)
+ page_in = 1;
+ else
+ page_out = 1;
+ }
+ if (io_flags & B_CACHE)
+ /*
+ * leave pages in the cache unchanged on error
+ */
+ upl_abort_code = UPL_ABORT_FREE_ON_EMPTY;
+ else if (page_out && ((error != ENXIO) || vnode_isswap(vp)))
+ /*
+ * transient error... leave pages unchanged
+ */
+ upl_abort_code = UPL_ABORT_FREE_ON_EMPTY;
+ else if (page_in)
+ upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR;
+ else
+ upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_DUMP_PAGES;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END,
- vp->v_ralen, vp->v_maxra, vp->v_lastr, 3, 0);
+ ubc_upl_abort_range(upl, upl_offset, abort_size, upl_abort_code);
+ }
+ return (upl_abort_code);
}
-cluster_pageout(vp, upl, upl_offset, f_offset, size, filesize, devblocksize, flags)
- struct vnode *vp;
- upl_t upl;
- vm_offset_t upl_offset;
- off_t f_offset;
- int size;
- off_t filesize;
- int devblocksize;
- int flags;
+static int
+cluster_iodone(buf_t bp, void *callback_arg)
{
- int io_size;
- int pg_size;
- off_t max_size;
- int local_flags = CL_PAGEOUT;
+ int b_flags;
+ int error;
+ int total_size;
+ int total_resid;
+ int upl_offset;
+ int zero_offset;
+ int pg_offset = 0;
+ int commit_size = 0;
+ int upl_flags = 0;
+ int transaction_size = 0;
+ upl_t upl;
+ buf_t cbp;
+ buf_t cbp_head;
+ buf_t cbp_next;
+ buf_t real_bp;
+ vnode_t vp;
+ struct clios *iostate;
+ boolean_t transaction_complete = FALSE;
+
+ __IGNORE_WCASTALIGN(cbp_head = (buf_t)(bp->b_trans_head));
- if ((flags & UPL_IOSYNC) == 0)
- local_flags |= CL_ASYNC;
- if ((flags & UPL_NOCOMMIT) == 0)
- local_flags |= CL_COMMIT;
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_START,
+ cbp_head, bp->b_lblkno, bp->b_bcount, bp->b_flags, 0);
- if (upl == (upl_t) 0)
- panic("cluster_pageout: can't handle NULL upl yet\n");
+ if (cbp_head->b_trans_next || !(cbp_head->b_flags & B_EOT)) {
+ lck_mtx_lock_spin(cl_transaction_mtxp);
+ bp->b_flags |= B_TDONE;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 52)) | DBG_FUNC_NONE,
- (int)f_offset, size, (int)filesize, local_flags, 0);
+ for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next) {
+ /*
+ * all I/O requests that are part of this transaction
+ * have to complete before we can process it
+ */
+ if ( !(cbp->b_flags & B_TDONE)) {
- /*
- * If they didn't specify any I/O, then we are done...
- * we can't issue an abort because we don't know how
- * big the upl really is
- */
- if (size <= 0)
- return (EINVAL);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
+ cbp_head, cbp, cbp->b_bcount, cbp->b_flags, 0);
- if (vp->v_mount->mnt_flag & MNT_RDONLY) {
- if (local_flags & CL_COMMIT)
- ubc_upl_abort_range(upl, upl_offset, size,
- UPL_ABORT_FREE_ON_EMPTY);
- return (EROFS);
- }
- /*
- * can't page-in from a negative offset
- * or if we're starting beyond the EOF
- * or if the file offset isn't page aligned
- * or the size requested isn't a multiple of PAGE_SIZE
- */
- if (f_offset < 0 || f_offset >= filesize ||
- (f_offset & PAGE_MASK_64) || (size & PAGE_MASK)) {
- if (local_flags & CL_COMMIT)
- ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY);
- return (EINVAL);
- }
- max_size = filesize - f_offset;
+ lck_mtx_unlock(cl_transaction_mtxp);
- if (size < max_size)
- io_size = size;
- else
- io_size = (max_size + (devblocksize - 1)) & ~(devblocksize - 1);
+ return 0;
+ }
- pg_size = (io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
+ if (cbp->b_trans_next == CLUSTER_IO_WAITING) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
+ cbp_head, cbp, cbp->b_bcount, cbp->b_flags, 0);
- if (size > pg_size) {
- if (local_flags & CL_COMMIT)
- ubc_upl_abort_range(upl, upl_offset + pg_size, size - pg_size,
- UPL_ABORT_FREE_ON_EMPTY);
- }
- while (vp->v_numoutput >= ASYNC_THROTTLE) {
- vp->v_flag |= VTHROTTLED;
- tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "cluster_pageout", 0);
+ lck_mtx_unlock(cl_transaction_mtxp);
+ wakeup(cbp);
+
+ return 0;
+ }
+
+ if (cbp->b_flags & B_EOT)
+ transaction_complete = TRUE;
+ }
+ lck_mtx_unlock(cl_transaction_mtxp);
+
+ if (transaction_complete == FALSE) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
+ cbp_head, 0, 0, 0, 0);
+ return 0;
+ }
}
+ error = 0;
+ total_size = 0;
+ total_resid = 0;
- return (cluster_io(vp, upl, upl_offset, f_offset, io_size,
- local_flags, (struct buf *)0));
-}
+ cbp = cbp_head;
+ vp = cbp->b_vp;
+ upl_offset = cbp->b_uploffset;
+ upl = cbp->b_upl;
+ b_flags = cbp->b_flags;
+ real_bp = cbp->b_real_bp;
+ zero_offset= cbp->b_validend;
+ iostate = (struct clios *)cbp->b_iostate;
+ if (real_bp)
+ real_bp->b_dev = cbp->b_dev;
-cluster_pagein(vp, upl, upl_offset, f_offset, size, filesize, devblocksize, flags)
- struct vnode *vp;
- upl_t upl;
- vm_offset_t upl_offset;
- off_t f_offset;
- int size;
- off_t filesize;
- int devblocksize;
- int flags;
-{
- u_int io_size;
- int pg_size;
- off_t max_size;
- int retval;
- int local_flags = 0;
+ while (cbp) {
+ if ((cbp->b_flags & B_ERROR) && error == 0)
+ error = cbp->b_error;
+ total_resid += cbp->b_resid;
+ total_size += cbp->b_bcount;
- /*
- * If they didn't ask for any data, then we are done...
- * we can't issue an abort because we don't know how
- * big the upl really is
- */
- if (size <= 0)
- return (EINVAL);
+ cbp_next = cbp->b_trans_next;
- if ((flags & UPL_NOCOMMIT) == 0)
- local_flags = CL_COMMIT;
+ if (cbp_next == NULL)
+ /*
+ * compute the overall size of the transaction
+ * in case we created one that has 'holes' in it
+ * 'total_size' represents the amount of I/O we
+ * did, not the span of the transaction w/r to the UPL
+ */
+ transaction_size = cbp->b_uploffset + cbp->b_bcount - upl_offset;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 56)) | DBG_FUNC_NONE,
- (int)f_offset, size, (int)filesize, local_flags, 0);
+ if (cbp != cbp_head)
+ free_io_buf(cbp);
- /*
- * can't page-in from a negative offset
- * or if we're starting beyond the EOF
- * or if the file offset isn't page aligned
- * or the size requested isn't a multiple of PAGE_SIZE
- */
- if (f_offset < 0 || f_offset >= filesize ||
- (f_offset & PAGE_MASK_64) || (size & PAGE_MASK)) {
- if (local_flags & CL_COMMIT)
- ubc_upl_abort_range(upl, upl_offset, size,
- UPL_ABORT_ERROR | UPL_ABORT_FREE_ON_EMPTY);
- return (EINVAL);
+ cbp = cbp_next;
}
- max_size = filesize - f_offset;
- if (size < max_size)
- io_size = size;
- else
- io_size = (max_size + (devblocksize - 1)) & ~(devblocksize - 1);
+ if (ISSET(b_flags, B_COMMIT_UPL)) {
+ cluster_handle_associated_upl(iostate,
+ cbp_head->b_upl,
+ upl_offset,
+ transaction_size);
+ }
- pg_size = (io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
+ if (error == 0 && total_resid)
+ error = EIO;
- if (upl == (upl_t) 0) {
- ubc_create_upl( vp,
- f_offset,
- pg_size,
- &upl,
- NULL,
- UPL_FLAGS_NONE);
+ if (error == 0) {
+ int (*cliodone_func)(buf_t, void *) = (int (*)(buf_t, void *))(cbp_head->b_cliodone);
- if (upl == (upl_t) 0)
- return (EINVAL);
+ if (cliodone_func != NULL) {
+ cbp_head->b_bcount = transaction_size;
- upl_offset = (vm_offset_t)0;
- size = pg_size;
- }
- if (size > pg_size) {
- if (local_flags & CL_COMMIT)
- ubc_upl_abort_range(upl, upl_offset + pg_size, size - pg_size,
- UPL_ABORT_FREE_ON_EMPTY);
+ error = (*cliodone_func)(cbp_head, callback_arg);
+ }
}
+ if (zero_offset)
+ cluster_zero(upl, zero_offset, PAGE_SIZE - (zero_offset & PAGE_MASK), real_bp);
- retval = cluster_io(vp, upl, upl_offset, f_offset, io_size,
- local_flags | CL_READ | CL_PAGEIN, (struct buf *)0);
+ free_io_buf(cbp_head);
- if (retval == 0) {
- int b_lblkno;
- int e_lblkno;
+ if (iostate) {
+ int need_wakeup = 0;
- b_lblkno = (int)(f_offset / PAGE_SIZE_64);
- e_lblkno = (int)
- ((f_offset + ((off_t)io_size - 1)) / PAGE_SIZE_64);
+ /*
+ * someone has issued multiple I/Os asynchrounsly
+ * and is waiting for them to complete (streaming)
+ */
+ lck_mtx_lock_spin(&iostate->io_mtxp);
+
+ if (error && iostate->io_error == 0)
+ iostate->io_error = error;
+
+ iostate->io_completed += total_size;
- if (!(flags & UPL_NORDAHEAD) && !(vp->v_flag & VRAOFF)) {
+ if (iostate->io_wanted) {
/*
- * we haven't read the last page in of the file yet
- * so let's try to read ahead if we're in
- * a sequential access pattern
+ * someone is waiting for the state of
+ * this io stream to change
*/
- cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize);
+ iostate->io_wanted = 0;
+ need_wakeup = 1;
}
- vp->v_lastr = e_lblkno;
+ lck_mtx_unlock(&iostate->io_mtxp);
+
+ if (need_wakeup)
+ wakeup((caddr_t)&iostate->io_wanted);
}
- return (retval);
-}
+ if (b_flags & B_COMMIT_UPL) {
+ pg_offset = upl_offset & PAGE_MASK;
+ commit_size = (pg_offset + transaction_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
-cluster_bp(bp)
- struct buf *bp;
-{
- off_t f_offset;
- int flags;
+ if (error)
+ upl_flags = cluster_ioerror(upl, upl_offset - pg_offset, commit_size, error, b_flags, vp);
+ else {
+ upl_flags = UPL_COMMIT_FREE_ON_EMPTY;
- if (bp->b_pagelist == (upl_t) 0)
- panic("cluster_bp: can't handle NULL upl yet\n");
- if (bp->b_flags & B_READ)
- flags = CL_ASYNC | CL_NOMAP | CL_READ;
- else
- flags = CL_ASYNC | CL_NOMAP;
+ if ((b_flags & B_PHYS) && (b_flags & B_READ))
+ upl_flags |= UPL_COMMIT_SET_DIRTY;
- f_offset = ubc_blktooff(bp->b_vp, bp->b_lblkno);
+ if (b_flags & B_AGE)
+ upl_flags |= UPL_COMMIT_INACTIVATE;
+
+ ubc_upl_commit_range(upl, upl_offset - pg_offset, commit_size, upl_flags);
+ }
+ }
+ if (real_bp) {
+ if (error) {
+ real_bp->b_flags |= B_ERROR;
+ real_bp->b_error = error;
+ }
+ real_bp->b_resid = total_resid;
- return (cluster_io(bp->b_vp, bp->b_pagelist, 0, f_offset, bp->b_bcount, flags, bp));
+ buf_biodone(real_bp);
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
+ upl, upl_offset - pg_offset, commit_size, (error << 24) | upl_flags, 0);
+
+ return (error);
}
-cluster_write(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags)
- struct vnode *vp;
- struct uio *uio;
- off_t oldEOF;
- off_t newEOF;
- off_t headOff;
- off_t tailOff;
- int devblocksize;
- int flags;
+uint32_t
+cluster_throttle_io_limit(vnode_t vp, uint32_t *limit)
{
- int prev_resid;
- int clip_size;
- off_t max_io_size;
- struct iovec *iov;
- vm_offset_t upl_offset;
- int upl_size;
- int pages_in_pl;
- upl_page_info_t *pl;
- int upl_flags;
- upl_t upl;
- int retval = 0;
+ if (cluster_is_throttled(vp)) {
+ *limit = THROTTLE_MAX_IOSIZE;
+ return 1;
+ }
+ return 0;
+}
- if ((!uio) || (uio->uio_segflg != UIO_USERSPACE) || (!(vp->v_flag & VNOCACHE_DATA)))
- {
- retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags);
- return(retval);
- }
-
- while (uio->uio_resid && uio->uio_offset < newEOF && retval == 0)
- {
- /* we know we have a resid, so this is safe */
- iov = uio->uio_iov;
- while (iov->iov_len == 0) {
- uio->uio_iov++;
- uio->uio_iovcnt--;
- iov = uio->uio_iov;
- }
-
- /*
- * We check every vector target and if it is physically
- * contiguous space, we skip the sanity checks.
- */
-
- upl_offset = (vm_offset_t)iov->iov_base & ~PAGE_MASK;
- upl_size = (upl_offset + PAGE_SIZE +(PAGE_SIZE -1)) & ~PAGE_MASK;
- pages_in_pl = 0;
- upl_flags = UPL_QUERY_OBJECT_TYPE;
- if ((vm_map_get_upl(current_map(),
- (vm_offset_t)iov->iov_base & ~PAGE_MASK,
- &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0)) != KERN_SUCCESS)
- {
- /*
- * the user app must have passed in an invalid address
- */
- return (EFAULT);
- }
+void
+cluster_zero(upl_t upl, upl_offset_t upl_offset, int size, buf_t bp)
+{
- if (upl_flags & UPL_PHYS_CONTIG)
- {
- /*
- * since the interface to the IOKit below us uses physical block #'s and
- * block counts to specify the I/O, we can't handle anything that isn't
- * devblocksize aligned
- */
- if ((uio->uio_offset & (devblocksize - 1)) || (uio->uio_resid & (devblocksize - 1)))
- return(EINVAL);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 23)) | DBG_FUNC_START,
+ upl_offset, size, bp, 0, 0);
- if (flags & IO_HEADZEROFILL)
- {
- flags &= ~IO_HEADZEROFILL;
+ if (bp == NULL || bp->b_datap == 0) {
+ upl_page_info_t *pl;
+ addr64_t zero_addr;
- if (retval = cluster_write_x(vp, (struct uio *)0, 0, uio->uio_offset, headOff, 0, devblocksize, IO_HEADZEROFILL))
- return(retval);
- }
-
- retval = cluster_phys_write(vp, uio);
-
- if (uio->uio_resid == 0 && (flags & IO_TAILZEROFILL))
- {
- retval = cluster_write_x(vp, (struct uio *)0, 0, tailOff, uio->uio_offset, 0, devblocksize, IO_HEADZEROFILL);
- return(retval);
- }
- }
- else if ((uio->uio_resid < 4 * PAGE_SIZE) || (flags & (IO_TAILZEROFILL | IO_HEADZEROFILL)))
- {
- /*
- * We set a threshhold of 4 pages to decide if the nocopy
- * write loop is worth the trouble...
- * we also come here if we're trying to zero the head and/or tail
- * of a partially written page, and the user source is not a physically contiguous region
- */
- retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags);
- return(retval);
- }
- else if (uio->uio_offset & PAGE_MASK_64)
- {
- /* Bring the file offset write up to a pagesize boundary */
- clip_size = (PAGE_SIZE - (uio->uio_offset & PAGE_MASK_64));
- if (uio->uio_resid < clip_size)
- clip_size = uio->uio_resid;
- /*
- * Fake the resid going into the cluster_write_x call
- * and restore it on the way out.
- */
- prev_resid = uio->uio_resid;
- uio->uio_resid = clip_size;
- retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags);
- uio->uio_resid = prev_resid - (clip_size - uio->uio_resid);
- }
- else if ((int)iov->iov_base & PAGE_MASK_64)
- {
- clip_size = iov->iov_len;
- prev_resid = uio->uio_resid;
- uio->uio_resid = clip_size;
- retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags);
- uio->uio_resid = prev_resid - (clip_size - uio->uio_resid);
- }
- else
- {
- /*
- * If we come in here, we know the offset into
- * the file is on a pagesize boundary
- */
-
- max_io_size = newEOF - uio->uio_offset;
- clip_size = uio->uio_resid;
- if (iov->iov_len < clip_size)
- clip_size = iov->iov_len;
- if (max_io_size < clip_size)
- clip_size = max_io_size;
-
- if (clip_size < PAGE_SIZE)
- {
- /*
- * Take care of tail end of write in this vector
- */
- prev_resid = uio->uio_resid;
- uio->uio_resid = clip_size;
- retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags);
- uio->uio_resid = prev_resid - (clip_size - uio->uio_resid);
- }
- else
- {
- /* round clip_size down to a multiple of pagesize */
- clip_size = clip_size & ~(PAGE_MASK);
- prev_resid = uio->uio_resid;
- uio->uio_resid = clip_size;
- retval = cluster_nocopy_write(vp, uio, newEOF, devblocksize, flags);
- if ((retval == 0) && uio->uio_resid)
- retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags);
- uio->uio_resid = prev_resid - (clip_size - uio->uio_resid);
- }
- } /* end else */
- } /* end while */
- return(retval);
-}
+ pl = ubc_upl_pageinfo(upl);
-static
-cluster_nocopy_write(vp, uio, newEOF, devblocksize, flags)
- struct vnode *vp;
- struct uio *uio;
- off_t newEOF;
- int devblocksize;
- int flags;
-{
- upl_t upl;
- upl_page_info_t *pl;
- off_t upl_f_offset;
- vm_offset_t upl_offset;
- off_t max_io_size;
- int io_size;
- int upl_size;
- int upl_needed_size;
- int pages_in_pl;
- int upl_flags;
- kern_return_t kret;
- struct iovec *iov;
- int i;
- int force_data_sync;
- int error = 0;
+ if (upl_device_page(pl) == TRUE) {
+ zero_addr = ((addr64_t)upl_phys_page(pl, 0) << PAGE_SHIFT) + upl_offset;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_START,
- (int)uio->uio_offset, (int)uio->uio_resid,
- (int)newEOF, devblocksize, 0);
+ bzero_phys_nc(zero_addr, size);
+ } else {
+ while (size) {
+ int page_offset;
+ int page_index;
+ int zero_cnt;
- /*
- * When we enter this routine, we know
- * -- the offset into the file is on a pagesize boundary
- * -- the resid is a page multiple
- * -- the resid will not exceed iov_len
- */
+ page_index = upl_offset / PAGE_SIZE;
+ page_offset = upl_offset & PAGE_MASK;
- iov = uio->uio_iov;
+ zero_addr = ((addr64_t)upl_phys_page(pl, page_index) << PAGE_SHIFT) + page_offset;
+ zero_cnt = min(PAGE_SIZE - page_offset, size);
- while (uio->uio_resid && uio->uio_offset < newEOF && error == 0) {
- io_size = uio->uio_resid;
+ bzero_phys(zero_addr, zero_cnt);
- if (io_size > (MAX_UPL_TRANSFER * PAGE_SIZE))
- io_size = MAX_UPL_TRANSFER * PAGE_SIZE;
+ size -= zero_cnt;
+ upl_offset += zero_cnt;
+ }
+ }
+ } else
+ bzero((caddr_t)((vm_offset_t)bp->b_datap + upl_offset), size);
- upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK_64;
- upl_needed_size = (upl_offset + io_size + (PAGE_SIZE -1)) & ~PAGE_MASK;
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 23)) | DBG_FUNC_END,
+ upl_offset, size, 0, 0, 0);
+}
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_START,
- (int)upl_offset, upl_needed_size, iov->iov_base, io_size, 0);
- for (force_data_sync = 0; force_data_sync < 3; force_data_sync++)
- {
- pages_in_pl = 0;
- upl_size = upl_needed_size;
- upl_flags = UPL_COPYOUT_FROM | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL;
+static void
+cluster_EOT(buf_t cbp_head, buf_t cbp_tail, int zero_offset)
+{
+ cbp_head->b_validend = zero_offset;
+ cbp_tail->b_flags |= B_EOT;
+}
- kret = vm_map_get_upl(current_map(),
- (vm_offset_t)iov->iov_base & ~PAGE_MASK,
- &upl_size,
- &upl,
- NULL,
- &pages_in_pl,
- &upl_flags,
- force_data_sync);
+static void
+cluster_wait_IO(buf_t cbp_head, int async)
+{
+ buf_t cbp;
- if (kret != KERN_SUCCESS)
- {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END,
- 0, 0, 0, kret, 0);
+ if (async) {
+ /*
+ * Async callback completion will not normally generate a
+ * wakeup upon I/O completion. To get woken up, we set
+ * b_trans_next (which is safe for us to modify) on the last
+ * buffer to CLUSTER_IO_WAITING so that cluster_iodone knows
+ * to wake us up when all buffers as part of this transaction
+ * are completed. This is done under the umbrella of
+ * cl_transaction_mtxp which is also taken in cluster_iodone.
+ */
+ bool done = true;
+ buf_t last = NULL;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_END,
- (int)uio->uio_offset, (int)uio->uio_resid, kret, 1, 0);
+ lck_mtx_lock_spin(cl_transaction_mtxp);
- /* cluster_nocopy_write: failed to get pagelist */
- /* do not return kret here */
- return(0);
+ for (cbp = cbp_head; cbp; last = cbp, cbp = cbp->b_trans_next) {
+ if (!ISSET(cbp->b_flags, B_TDONE))
+ done = false;
}
- pl = UPL_GET_INTERNAL_PAGE_LIST(upl);
- pages_in_pl = upl_size / PAGE_SIZE;
-
- for(i=0; i < pages_in_pl; i++)
- {
- if (!upl_valid_page(pl, i))
- break;
- }
+ if (!done) {
+ last->b_trans_next = CLUSTER_IO_WAITING;
- if (i == pages_in_pl)
- break;
+ DTRACE_IO1(wait__start, buf_t, last);
+ do {
+ msleep(last, cl_transaction_mtxp, PSPIN | (PRIBIO+1), "cluster_wait_IO", NULL);
- ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size,
- UPL_ABORT_FREE_ON_EMPTY);
- }
-
- if (force_data_sync >= 3)
- {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END,
- i, pages_in_pl, upl_size, kret, 0);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_END,
- (int)uio->uio_offset, (int)uio->uio_resid, kret, 2, 0);
- return(0);
- }
-
- /*
- * Consider the possibility that upl_size wasn't satisfied.
- */
- if (upl_size != upl_needed_size)
- io_size = (upl_size - (int)upl_offset) & ~PAGE_MASK;
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END,
- (int)upl_offset, upl_size, iov->iov_base, io_size, 0);
-
- if (io_size == 0)
- {
- ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size,
- UPL_ABORT_FREE_ON_EMPTY);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_END,
- (int)uio->uio_offset, uio->uio_resid, 0, 3, 0);
-
- return(0);
- }
-
- /*
- * Now look for pages already in the cache
- * and throw them away.
- */
-
- upl_f_offset = uio->uio_offset; /* this is page aligned in the file */
- max_io_size = io_size;
-
- while (max_io_size) {
-
- /*
- * Flag UPL_POP_DUMP says if the page is found
- * in the page cache it must be thrown away.
- */
- ubc_page_op(vp,
- upl_f_offset,
- UPL_POP_SET | UPL_POP_BUSY | UPL_POP_DUMP,
- 0, 0);
- max_io_size -= PAGE_SIZE;
- upl_f_offset += PAGE_SIZE;
- }
-
- /*
- * issue a synchronous write to cluster_io
- */
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 77)) | DBG_FUNC_START,
- (int)upl_offset, (int)uio->uio_offset, io_size, 0, 0);
-
- error = cluster_io(vp, upl, upl_offset, uio->uio_offset,
- io_size, 0, (struct buf *)0);
-
- if (error == 0) {
- /*
- * The cluster_io write completed successfully,
- * update the uio structure and commit.
- */
-
- ubc_upl_commit_range(upl, (upl_offset & ~PAGE_MASK), upl_size,
- UPL_COMMIT_FREE_ON_EMPTY);
-
- iov->iov_base += io_size;
- iov->iov_len -= io_size;
- uio->uio_resid -= io_size;
- uio->uio_offset += io_size;
- }
- else {
- ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size,
- UPL_ABORT_FREE_ON_EMPTY);
- }
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 77)) | DBG_FUNC_END,
- (int)upl_offset, (int)uio->uio_offset, (int)uio->uio_resid, error, 0);
+ /*
+ * We should only have been woken up if all the
+ * buffers are completed, but just in case...
+ */
+ done = true;
+ for (cbp = cbp_head; cbp != CLUSTER_IO_WAITING; cbp = cbp->b_trans_next) {
+ if (!ISSET(cbp->b_flags, B_TDONE)) {
+ done = false;
+ break;
+ }
+ }
+ } while (!done);
+ DTRACE_IO1(wait__done, buf_t, last);
- } /* end while */
+ last->b_trans_next = NULL;
+ }
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_END,
- (int)uio->uio_offset, (int)uio->uio_resid, error, 4, 0);
-
- return (error);
+ lck_mtx_unlock(cl_transaction_mtxp);
+ } else { // !async
+ for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next)
+ buf_biowait(cbp);
+ }
}
-static
-cluster_phys_write(vp, uio)
- struct vnode *vp;
- struct uio *uio;
+static void
+cluster_complete_transaction(buf_t *cbp_head, void *callback_arg, int *retval, int flags, int needwait)
{
- upl_t upl;
- vm_offset_t upl_offset;
- int io_size;
- int upl_size;
- int upl_needed_size;
- int pages_in_pl;
- int upl_flags;
- kern_return_t kret;
- struct iovec *iov;
- int error = 0;
+ buf_t cbp;
+ int error;
+ boolean_t isswapout = FALSE;
/*
- * When we enter this routine, we know
- * -- the resid will not exceed iov_len
- * -- the vector target address is physcially contiguous
+ * cluster_complete_transaction will
+ * only be called if we've issued a complete chain in synchronous mode
+ * or, we've already done a cluster_wait_IO on an incomplete chain
+ */
+ if (needwait) {
+ for (cbp = *cbp_head; cbp; cbp = cbp->b_trans_next)
+ buf_biowait(cbp);
+ }
+ /*
+ * we've already waited on all of the I/Os in this transaction,
+ * so mark all of the buf_t's in this transaction as B_TDONE
+ * so that cluster_iodone sees the transaction as completed
*/
+ for (cbp = *cbp_head; cbp; cbp = cbp->b_trans_next)
+ cbp->b_flags |= B_TDONE;
+ cbp = *cbp_head;
- iov = uio->uio_iov;
- io_size = iov->iov_len;
- upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK_64;
- upl_needed_size = upl_offset + io_size;
+ if ((flags & (CL_ASYNC | CL_PAGEOUT)) == CL_PAGEOUT && vnode_isswap(cbp->b_vp))
+ isswapout = TRUE;
- pages_in_pl = 0;
- upl_size = upl_needed_size;
- upl_flags = UPL_COPYOUT_FROM | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL;
+ error = cluster_iodone(cbp, callback_arg);
- kret = vm_map_get_upl(current_map(),
- (vm_offset_t)iov->iov_base & ~PAGE_MASK,
- &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0);
+ if ( !(flags & CL_ASYNC) && error && *retval == 0) {
+ if (((flags & (CL_PAGEOUT | CL_KEEPCACHED)) != CL_PAGEOUT) || (error != ENXIO))
+ *retval = error;
+ else if (isswapout == TRUE)
+ *retval = error;
+ }
+ *cbp_head = (buf_t)NULL;
+}
- if (kret != KERN_SUCCESS)
- {
- /* cluster_phys_write: failed to get pagelist */
- /* note: return kret here */
- return(EINVAL);
- }
+
+static int
+cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int non_rounded_size,
+ int flags, buf_t real_bp, struct clios *iostate, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ buf_t cbp;
+ u_int size;
+ u_int io_size;
+ int io_flags;
+ int bmap_flags;
+ int error = 0;
+ int retval = 0;
+ buf_t cbp_head = NULL;
+ buf_t cbp_tail = NULL;
+ int trans_count = 0;
+ int max_trans_count;
+ u_int pg_count;
+ int pg_offset;
+ u_int max_iosize;
+ u_int max_vectors;
+ int priv;
+ int zero_offset = 0;
+ int async_throttle = 0;
+ mount_t mp;
+ vm_offset_t upl_end_offset;
+ boolean_t need_EOT = FALSE;
/*
- * Consider the possibility that upl_size wasn't satisfied.
- * This is a failure in the physical memory case.
+ * we currently don't support buffers larger than a page
*/
- if (upl_size < upl_needed_size)
- {
- kernel_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
- return(EINVAL);
- }
+ if (real_bp && non_rounded_size > PAGE_SIZE)
+ panic("%s(): Called with real buffer of size %d bytes which "
+ "is greater than the maximum allowed size of "
+ "%d bytes (the system PAGE_SIZE).\n",
+ __FUNCTION__, non_rounded_size, PAGE_SIZE);
+
+ mp = vp->v_mount;
/*
- * issue a synchronous write to cluster_io
+ * we don't want to do any funny rounding of the size for IO requests
+ * coming through the DIRECT or CONTIGUOUS paths... those pages don't
+ * belong to us... we can't extend (nor do we need to) the I/O to fill
+ * out a page
*/
+ if (mp->mnt_devblocksize > 1 && !(flags & (CL_DEV_MEMORY | CL_DIRECT_IO))) {
+ /*
+ * round the requested size up so that this I/O ends on a
+ * page boundary in case this is a 'write'... if the filesystem
+ * has blocks allocated to back the page beyond the EOF, we want to
+ * make sure to write out the zero's that are sitting beyond the EOF
+ * so that in case the filesystem doesn't explicitly zero this area
+ * if a hole is created via a lseek/write beyond the current EOF,
+ * it will return zeros when it's read back from the disk. If the
+ * physical allocation doesn't extend for the whole page, we'll
+ * only write/read from the disk up to the end of this allocation
+ * via the extent info returned from the VNOP_BLOCKMAP call.
+ */
+ pg_offset = upl_offset & PAGE_MASK;
- error = cluster_io(vp, upl, upl_offset, uio->uio_offset,
- io_size, CL_DEV_MEMORY, (struct buf *)0);
-
- if (error == 0) {
- /*
- * The cluster_io write completed successfully,
- * update the uio structure and commit.
- */
-
- ubc_upl_commit_range(upl, 0, upl_size, UPL_COMMIT_FREE_ON_EMPTY);
-
- iov->iov_base += io_size;
- iov->iov_len -= io_size;
- uio->uio_resid -= io_size;
- uio->uio_offset += io_size;
+ size = (((non_rounded_size + pg_offset) + (PAGE_SIZE - 1)) & ~PAGE_MASK) - pg_offset;
+ } else {
+ /*
+ * anyone advertising a blocksize of 1 byte probably
+ * can't deal with us rounding up the request size
+ * AFP is one such filesystem/device
+ */
+ size = non_rounded_size;
}
- else
- ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
+ upl_end_offset = upl_offset + size;
- return (error);
-}
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_START, (int)f_offset, size, upl_offset, flags, 0);
-static
-cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags)
- struct vnode *vp;
- struct uio *uio;
- off_t oldEOF;
- off_t newEOF;
- off_t headOff;
- off_t tailOff;
- int devblocksize;
- int flags;
-{
- upl_page_info_t *pl;
- upl_t upl;
- vm_offset_t upl_offset;
- int upl_size;
- off_t upl_f_offset;
- int pages_in_upl;
- int start_offset;
- int xfer_resid;
- int io_size;
- int io_size_before_rounding;
- int io_flags;
- vm_offset_t io_address;
- int io_offset;
- int bytes_to_zero;
- int bytes_to_move;
- kern_return_t kret;
- int retval = 0;
- int uio_resid;
- long long total_size;
- long long zero_cnt;
- off_t zero_off;
- long long zero_cnt1;
- off_t zero_off1;
- daddr_t start_blkno;
- daddr_t last_blkno;
+ /*
+ * Set the maximum transaction size to the maximum desired number of
+ * buffers.
+ */
+ max_trans_count = 8;
+ if (flags & CL_DEV_MEMORY)
+ max_trans_count = 16;
- if (uio) {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_START,
- (int)uio->uio_offset, uio->uio_resid, (int)oldEOF, (int)newEOF, 0);
+ if (flags & CL_READ) {
+ io_flags = B_READ;
+ bmap_flags = VNODE_READ;
- uio_resid = uio->uio_resid;
+ max_iosize = mp->mnt_maxreadcnt;
+ max_vectors = mp->mnt_segreadcnt;
} else {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_START,
- 0, 0, (int)oldEOF, (int)newEOF, 0);
+ io_flags = B_WRITE;
+ bmap_flags = VNODE_WRITE;
- uio_resid = 0;
+ max_iosize = mp->mnt_maxwritecnt;
+ max_vectors = mp->mnt_segwritecnt;
}
- zero_cnt = 0;
- zero_cnt1 = 0;
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_NONE, max_iosize, max_vectors, mp->mnt_devblocksize, 0, 0);
- if (flags & IO_HEADZEROFILL) {
- /*
- * some filesystems (HFS is one) don't support unallocated holes within a file...
- * so we zero fill the intervening space between the old EOF and the offset
- * where the next chunk of real data begins.... ftruncate will also use this
- * routine to zero fill to the new EOF when growing a file... in this case, the
- * uio structure will not be provided
- */
- if (uio) {
- if (headOff < uio->uio_offset) {
- zero_cnt = uio->uio_offset - headOff;
- zero_off = headOff;
+ /*
+ * make sure the maximum iosize is a
+ * multiple of the page size
+ */
+ max_iosize &= ~PAGE_MASK;
+
+ /*
+ * Ensure the maximum iosize is sensible.
+ */
+ if (!max_iosize)
+ max_iosize = PAGE_SIZE;
+
+ if (flags & CL_THROTTLE) {
+ if ( !(flags & CL_PAGEOUT) && cluster_is_throttled(vp)) {
+ if (max_iosize > THROTTLE_MAX_IOSIZE)
+ max_iosize = THROTTLE_MAX_IOSIZE;
+ async_throttle = THROTTLE_MAXCNT;
+ } else {
+ if ( (flags & CL_DEV_MEMORY) )
+ async_throttle = IO_SCALE(vp, VNODE_ASYNC_THROTTLE);
+ else {
+ u_int max_cluster;
+ u_int max_cluster_size;
+ u_int scale;
+
+ if (vp->v_mount->mnt_minsaturationbytecount) {
+ max_cluster_size = vp->v_mount->mnt_minsaturationbytecount;
+
+ scale = 1;
+ } else {
+ max_cluster_size = MAX_CLUSTER_SIZE(vp);
+
+ if ((vp->v_mount->mnt_kern_flag & MNTK_SSD) && !ignore_is_ssd)
+ scale = WRITE_THROTTLE_SSD;
+ else
+ scale = WRITE_THROTTLE;
+ }
+ if (max_iosize > max_cluster_size)
+ max_cluster = max_cluster_size;
+ else
+ max_cluster = max_iosize;
+
+ if (size < max_cluster)
+ max_cluster = size;
+
+ if (flags & CL_CLOSE)
+ scale += MAX_CLUSTERS;
+
+ async_throttle = min(IO_SCALE(vp, VNODE_ASYNC_THROTTLE), ((scale * max_cluster_size) / max_cluster) - 1);
}
- } else if (headOff < newEOF) {
- zero_cnt = newEOF - headOff;
- zero_off = headOff;
}
}
- if (flags & IO_TAILZEROFILL) {
- if (uio) {
- zero_off1 = uio->uio_offset + uio->uio_resid;
-
- if (zero_off1 < tailOff)
- zero_cnt1 = tailOff - zero_off1;
- }
- }
- if (zero_cnt == 0 && uio == (struct uio *) 0)
- {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_END,
- retval, 0, 0, 0, 0);
- return (0);
- }
-
- while ((total_size = (uio_resid + zero_cnt + zero_cnt1)) && retval == 0) {
+ if (flags & CL_AGE)
+ io_flags |= B_AGE;
+ if (flags & (CL_PAGEIN | CL_PAGEOUT))
+ io_flags |= B_PAGEIO;
+ if (flags & (CL_IOSTREAMING))
+ io_flags |= B_IOSTREAMING;
+ if (flags & CL_COMMIT)
+ io_flags |= B_COMMIT_UPL;
+ if (flags & CL_DIRECT_IO)
+ io_flags |= B_PHYS;
+ if (flags & (CL_PRESERVE | CL_KEEPCACHED))
+ io_flags |= B_CACHE;
+ if (flags & CL_PASSIVE)
+ io_flags |= B_PASSIVE;
+ if (flags & CL_ENCRYPTED)
+ io_flags |= B_ENCRYPTED_IO;
+
+ if (vp->v_flag & VSYSTEM)
+ io_flags |= B_META;
+
+ if ((flags & CL_READ) && ((upl_offset + non_rounded_size) & PAGE_MASK) && (!(flags & CL_NOZERO))) {
/*
- * for this iteration of the loop, figure out where our starting point is
+ * then we are going to end up
+ * with a page that we can't complete (the file size wasn't a multiple
+ * of PAGE_SIZE and we're trying to read to the end of the file
+ * so we'll go ahead and zero out the portion of the page we can't
+ * read in from the file
*/
- if (zero_cnt) {
- start_offset = (int)(zero_off & PAGE_MASK_64);
- upl_f_offset = zero_off - start_offset;
- } else if (uio_resid) {
- start_offset = (int)(uio->uio_offset & PAGE_MASK_64);
- upl_f_offset = uio->uio_offset - start_offset;
- } else {
- start_offset = (int)(zero_off1 & PAGE_MASK_64);
- upl_f_offset = zero_off1 - start_offset;
- }
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 46)) | DBG_FUNC_NONE,
- (int)zero_off, (int)zero_cnt, (int)zero_off1, (int)zero_cnt1, 0);
+ zero_offset = upl_offset + non_rounded_size;
+ } else if (!ISSET(flags, CL_READ) && ISSET(flags, CL_DIRECT_IO)) {
+ assert(ISSET(flags, CL_COMMIT));
+
+ // For a direct/uncached write, we need to lock pages...
- if (total_size > (MAX_UPL_TRANSFER * PAGE_SIZE))
- total_size = MAX_UPL_TRANSFER * PAGE_SIZE;
+ upl_t cached_upl;
/*
- * compute the size of the upl needed to encompass
- * the requested write... limit each call to cluster_io
- * to the maximum UPL size... cluster_io will clip if
- * this exceeds the maximum io_size for the device,
- * make sure to account for
- * a starting offset that's not page aligned
+ * Create a UPL to lock the pages in the cache whilst the
+ * write is in progress.
*/
- upl_size = (start_offset + total_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
+ ubc_create_upl(vp, f_offset, non_rounded_size, &cached_upl,
+ NULL, UPL_SET_LITE);
- if (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE))
- upl_size = MAX_UPL_TRANSFER * PAGE_SIZE;
+ /*
+ * Attach this UPL to the other UPL so that we can find it
+ * later.
+ */
+ upl_set_associated_upl(upl, cached_upl);
- pages_in_upl = upl_size / PAGE_SIZE;
- io_size = upl_size - start_offset;
-
- if ((long long)io_size > total_size)
- io_size = total_size;
+ if (upl_offset & PAGE_MASK) {
+ /*
+ * The two UPLs are not aligned, so mark the first page in
+ * @upl so that cluster_handle_associated_upl can handle
+ * it accordingly.
+ */
+ upl_page_info_t *pl = UPL_GET_INTERNAL_PAGE_LIST(upl);
+ upl_page_set_mark(pl, 0, true);
+ }
+ }
- start_blkno = (daddr_t)(upl_f_offset / PAGE_SIZE_64);
- last_blkno = start_blkno + pages_in_upl;
+ while (size) {
+ daddr64_t blkno;
+ daddr64_t lblkno;
+ u_int io_size_wanted;
+ size_t io_size_tmp;
- kret = ubc_create_upl(vp,
- upl_f_offset,
- upl_size,
- &upl,
- &pl,
- UPL_FLAGS_NONE);
- if (kret != KERN_SUCCESS)
- panic("cluster_write: failed to get pagelist");
+ if (size > max_iosize)
+ io_size = max_iosize;
+ else
+ io_size = size;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_NONE,
- upl, (int)upl_f_offset, upl_size, start_offset, 0);
+ io_size_wanted = io_size;
+ io_size_tmp = (size_t)io_size;
+
+ if ((error = VNOP_BLOCKMAP(vp, f_offset, io_size, &blkno, &io_size_tmp, NULL, bmap_flags, NULL)))
+ break;
- if (start_offset && !upl_valid_page(pl, 0)) {
- int read_size;
+ if (io_size_tmp > io_size_wanted)
+ io_size = io_size_wanted;
+ else
+ io_size = (u_int)io_size_tmp;
- /*
- * we're starting in the middle of the first page of the upl
- * and the page isn't currently valid, so we're going to have
- * to read it in first... this is a synchronous operation
+ if (real_bp && (real_bp->b_blkno == real_bp->b_lblkno))
+ real_bp->b_blkno = blkno;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 24)) | DBG_FUNC_NONE,
+ (int)f_offset, (int)(blkno>>32), (int)blkno, io_size, 0);
+
+ if (io_size == 0) {
+ /*
+ * vnop_blockmap didn't return an error... however, it did
+ * return an extent size of 0 which means we can't
+ * make forward progress on this I/O... a hole in the
+ * file would be returned as a blkno of -1 with a non-zero io_size
+ * a real extent is returned with a blkno != -1 and a non-zero io_size
*/
- read_size = PAGE_SIZE;
+ error = EINVAL;
+ break;
+ }
+ if ( !(flags & CL_READ) && blkno == -1) {
+ off_t e_offset;
+ int pageout_flags;
- if ((upl_f_offset + read_size) > newEOF) {
- read_size = newEOF - upl_f_offset;
- read_size = (read_size + (devblocksize - 1)) & ~(devblocksize - 1);
- }
- retval = cluster_io(vp, upl, 0, upl_f_offset, read_size,
- CL_READ, (struct buf *)0);
- if (retval) {
- /*
- * we had an error during the read which causes us to abort
- * the current cluster_write request... before we do, we need
- * to release the rest of the pages in the upl without modifying
- * there state and mark the failed page in error
+ if (upl_get_internal_vectorupl(upl))
+ panic("Vector UPLs should not take this code-path\n");
+ /*
+ * we're writing into a 'hole'
+ */
+ if (flags & CL_PAGEOUT) {
+ /*
+ * if we got here via cluster_pageout
+ * then just error the request and return
+ * the 'hole' should already have been covered
*/
- ubc_upl_abort_range(upl, 0, PAGE_SIZE, UPL_ABORT_DUMP_PAGES);
- ubc_upl_abort(upl, 0);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE,
- upl, 0, 0, retval, 0);
+ error = EINVAL;
break;
}
- }
- if ((start_offset == 0 || upl_size > PAGE_SIZE) && ((start_offset + io_size) & PAGE_MASK)) {
- /*
- * the last offset we're writing to in this upl does not end on a page
- * boundary... if it's not beyond the old EOF, then we'll also need to
- * pre-read this page in if it isn't already valid
+ /*
+ * we can get here if the cluster code happens to
+ * pick up a page that was dirtied via mmap vs
+ * a 'write' and the page targets a 'hole'...
+ * i.e. the writes to the cluster were sparse
+ * and the file was being written for the first time
+ *
+ * we can also get here if the filesystem supports
+ * 'holes' that are less than PAGE_SIZE.... because
+ * we can't know if the range in the page that covers
+ * the 'hole' has been dirtied via an mmap or not,
+ * we have to assume the worst and try to push the
+ * entire page to storage.
+ *
+ * Try paging out the page individually before
+ * giving up entirely and dumping it (the pageout
+ * path will insure that the zero extent accounting
+ * has been taken care of before we get back into cluster_io)
+ *
+ * go direct to vnode_pageout so that we don't have to
+ * unbusy the page from the UPL... we used to do this
+ * so that we could call ubc_msync, but that results
+ * in a potential deadlock if someone else races us to acquire
+ * that page and wins and in addition needs one of the pages
+ * we're continuing to hold in the UPL
*/
- upl_offset = upl_size - PAGE_SIZE;
+ pageout_flags = UPL_MSYNC | UPL_VNODE_PAGER | UPL_NESTED_PAGEOUT;
- if ((upl_f_offset + start_offset + io_size) < oldEOF &&
- !upl_valid_page(pl, upl_offset / PAGE_SIZE)) {
- int read_size;
+ if ( !(flags & CL_ASYNC))
+ pageout_flags |= UPL_IOSYNC;
+ if ( !(flags & CL_COMMIT))
+ pageout_flags |= UPL_NOCOMMIT;
- read_size = PAGE_SIZE;
+ if (cbp_head) {
+ buf_t prev_cbp;
+ int bytes_in_last_page;
- if ((upl_f_offset + upl_offset + read_size) > newEOF) {
- read_size = newEOF - (upl_f_offset + upl_offset);
- read_size = (read_size + (devblocksize - 1)) & ~(devblocksize - 1);
- }
- retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, read_size,
- CL_READ, (struct buf *)0);
- if (retval) {
+ /*
+ * first we have to wait for the the current outstanding I/Os
+ * to complete... EOT hasn't been set yet on this transaction
+ * so the pages won't be released
+ */
+ cluster_wait_IO(cbp_head, (flags & CL_ASYNC));
+
+ bytes_in_last_page = cbp_head->b_uploffset & PAGE_MASK;
+ for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next)
+ bytes_in_last_page += cbp->b_bcount;
+ bytes_in_last_page &= PAGE_MASK;
+
+ while (bytes_in_last_page) {
/*
- * we had an error during the read which causes us to abort
- * the current cluster_write request... before we do, we
- * need to release the rest of the pages in the upl without
- * modifying there state and mark the failed page in error
+ * we've got a transcation that
+ * includes the page we're about to push out through vnode_pageout...
+ * find the bp's in the list which intersect this page and either
+ * remove them entirely from the transaction (there could be multiple bp's), or
+ * round it's iosize down to the page boundary (there can only be one)...
+ *
+ * find the last bp in the list and act on it
*/
- ubc_upl_abort_range(upl, upl_offset, PAGE_SIZE,
- UPL_ABORT_DUMP_PAGES);
- ubc_upl_abort(upl, 0);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE,
- upl, 0, 0, retval, 0);
- break;
- }
- }
- }
- if ((kret = ubc_upl_map(upl, &io_address)) != KERN_SUCCESS)
- panic("cluster_write: ubc_upl_map failed\n");
- xfer_resid = io_size;
- io_offset = start_offset;
-
- while (zero_cnt && xfer_resid) {
+ for (prev_cbp = cbp = cbp_head; cbp->b_trans_next; cbp = cbp->b_trans_next)
+ prev_cbp = cbp;
- if (zero_cnt < (long long)xfer_resid)
- bytes_to_zero = zero_cnt;
- else
- bytes_to_zero = xfer_resid;
+ if (bytes_in_last_page >= cbp->b_bcount) {
+ /*
+ * this buf no longer has any I/O associated with it
+ */
+ bytes_in_last_page -= cbp->b_bcount;
+ cbp->b_bcount = 0;
- if ( !(flags & IO_NOZEROVALID)) {
- bzero((caddr_t)(io_address + io_offset), bytes_to_zero);
+ free_io_buf(cbp);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE,
- (int)upl_f_offset + io_offset, bytes_to_zero,
- (int)zero_cnt, xfer_resid, 0);
- } else {
- bytes_to_zero = min(bytes_to_zero, PAGE_SIZE - (int)(zero_off & PAGE_MASK_64));
+ if (cbp == cbp_head) {
+ assert(bytes_in_last_page == 0);
+ /*
+ * the buf we just freed was the only buf in
+ * this transaction... so there's no I/O to do
+ */
+ cbp_head = NULL;
+ cbp_tail = NULL;
+ } else {
+ /*
+ * remove the buf we just freed from
+ * the transaction list
+ */
+ prev_cbp->b_trans_next = NULL;
+ cbp_tail = prev_cbp;
+ }
+ } else {
+ /*
+ * this is the last bp that has I/O
+ * intersecting the page of interest
+ * only some of the I/O is in the intersection
+ * so clip the size but keep it in the transaction list
+ */
+ cbp->b_bcount -= bytes_in_last_page;
+ cbp_tail = cbp;
+ bytes_in_last_page = 0;
+ }
+ }
+ if (cbp_head) {
+ /*
+ * there was more to the current transaction
+ * than just the page we are pushing out via vnode_pageout...
+ * mark it as finished and complete it... we've already
+ * waited for the I/Os to complete above in the call to cluster_wait_IO
+ */
+ cluster_EOT(cbp_head, cbp_tail, 0);
- if ( !upl_valid_page(pl, (int)(zero_off / PAGE_SIZE_64))) {
- bzero((caddr_t)(io_address + io_offset), bytes_to_zero);
+ cluster_complete_transaction(&cbp_head, callback_arg, &retval, flags, 0);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE,
- (int)upl_f_offset + io_offset, bytes_to_zero,
- (int)zero_cnt, xfer_resid, 0);
+ trans_count = 0;
}
}
- xfer_resid -= bytes_to_zero;
- zero_cnt -= bytes_to_zero;
- zero_off += bytes_to_zero;
- io_offset += bytes_to_zero;
- }
- if (xfer_resid && uio_resid) {
- bytes_to_move = min(uio_resid, xfer_resid);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 42)) | DBG_FUNC_NONE,
- (int)uio->uio_offset, bytes_to_move, uio_resid, xfer_resid, 0);
+ if (vnode_pageout(vp, upl, trunc_page(upl_offset), trunc_page_64(f_offset), PAGE_SIZE, pageout_flags, NULL) != PAGER_SUCCESS) {
+ error = EINVAL;
+ }
+ e_offset = round_page_64(f_offset + 1);
+ io_size = e_offset - f_offset;
- retval = uiomove((caddr_t)(io_address + io_offset), bytes_to_move, uio);
+ f_offset += io_size;
+ upl_offset += io_size;
- if (retval) {
- if ((kret = ubc_upl_unmap(upl)) != KERN_SUCCESS)
- panic("cluster_write: kernel_upl_unmap failed\n");
- ubc_upl_abort(upl, UPL_ABORT_DUMP_PAGES);
+ if (size >= io_size)
+ size -= io_size;
+ else
+ size = 0;
+ /*
+ * keep track of how much of the original request
+ * that we've actually completed... non_rounded_size
+ * may go negative due to us rounding the request
+ * to a page size multiple (i.e. size > non_rounded_size)
+ */
+ non_rounded_size -= io_size;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE,
- upl, 0, 0, retval, 0);
- } else {
- uio_resid -= bytes_to_move;
- xfer_resid -= bytes_to_move;
- io_offset += bytes_to_move;
+ if (non_rounded_size <= 0) {
+ /*
+ * we've transferred all of the data in the original
+ * request, but we were unable to complete the tail
+ * of the last page because the file didn't have
+ * an allocation to back that portion... this is ok.
+ */
+ size = 0;
}
- }
- while (xfer_resid && zero_cnt1 && retval == 0) {
-
- if (zero_cnt1 < (long long)xfer_resid)
- bytes_to_zero = zero_cnt1;
- else
- bytes_to_zero = xfer_resid;
-
- if ( !(flags & IO_NOZEROVALID)) {
- bzero((caddr_t)(io_address + io_offset), bytes_to_zero);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE,
- (int)upl_f_offset + io_offset,
- bytes_to_zero, (int)zero_cnt1, xfer_resid, 0);
- } else {
- bytes_to_zero = min(bytes_to_zero, PAGE_SIZE - (int)(zero_off1 & PAGE_MASK_64));
- if ( !upl_valid_page(pl, (int)(zero_off1 / PAGE_SIZE_64))) {
- bzero((caddr_t)(io_address + io_offset), bytes_to_zero);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE,
- (int)upl_f_offset + io_offset,
- bytes_to_zero, (int)zero_cnt1, xfer_resid, 0);
- }
+ if (error) {
+ if (size == 0)
+ flags &= ~CL_COMMIT;
+ break;
}
- xfer_resid -= bytes_to_zero;
- zero_cnt1 -= bytes_to_zero;
- zero_off1 += bytes_to_zero;
- io_offset += bytes_to_zero;
+ continue;
}
+ lblkno = (daddr64_t)(f_offset / 0x1000);
+ /*
+ * we have now figured out how much I/O we can do - this is in 'io_size'
+ * pg_offset is the starting point in the first page for the I/O
+ * pg_count is the number of full and partial pages that 'io_size' encompasses
+ */
+ pg_offset = upl_offset & PAGE_MASK;
- if (retval == 0) {
- int must_push;
- int can_delay;
+ if (flags & CL_DEV_MEMORY) {
+ /*
+ * treat physical requests as one 'giant' page
+ */
+ pg_count = 1;
+ } else
+ pg_count = (io_size + pg_offset + (PAGE_SIZE - 1)) / PAGE_SIZE;
- io_size += start_offset;
+ if ((flags & CL_READ) && blkno == -1) {
+ vm_offset_t commit_offset;
+ int bytes_to_zero;
+ int complete_transaction_now = 0;
- if ((upl_f_offset + io_size) == newEOF && io_size < upl_size) {
+ /*
+ * if we're reading and blkno == -1, then we've got a
+ * 'hole' in the file that we need to deal with by zeroing
+ * out the affected area in the upl
+ */
+ if (io_size >= (u_int)non_rounded_size) {
/*
- * if we're extending the file with this write
- * we'll zero fill the rest of the page so that
- * if the file gets extended again in such a way as to leave a
- * hole starting at this EOF, we'll have zero's in the correct spot
+ * if this upl contains the EOF and it is not a multiple of PAGE_SIZE
+ * than 'zero_offset' will be non-zero
+ * if the 'hole' returned by vnop_blockmap extends all the way to the eof
+ * (indicated by the io_size finishing off the I/O request for this UPL)
+ * than we're not going to issue an I/O for the
+ * last page in this upl... we need to zero both the hole and the tail
+ * of the page beyond the EOF, since the delayed zero-fill won't kick in
*/
- bzero((caddr_t)(io_address + io_size), upl_size - io_size);
+ bytes_to_zero = non_rounded_size;
+ if (!(flags & CL_NOZERO))
+ bytes_to_zero = (((upl_offset + io_size) + (PAGE_SIZE - 1)) & ~PAGE_MASK) - upl_offset;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE,
- (int)upl_f_offset + io_size,
- upl_size - io_size, 0, 0, 0);
- }
- if ((kret = ubc_upl_unmap(upl)) != KERN_SUCCESS)
- panic("cluster_write: kernel_upl_unmap failed\n");
-
- io_size_before_rounding = io_size;
-
- if (io_size & (devblocksize - 1))
- io_size = (io_size + (devblocksize - 1)) & ~(devblocksize - 1);
+ zero_offset = 0;
+ } else
+ bytes_to_zero = io_size;
- must_push = 0;
- can_delay = 0;
+ pg_count = 0;
- if (vp->v_clen) {
- int newsize;
+ cluster_zero(upl, upl_offset, bytes_to_zero, real_bp);
+
+ if (cbp_head) {
+ int pg_resid;
/*
- * we have an existing cluster... see if this write will extend it nicely
+ * if there is a current I/O chain pending
+ * then the first page of the group we just zero'd
+ * will be handled by the I/O completion if the zero
+ * fill started in the middle of the page
*/
- if (start_blkno >= vp->v_cstart) {
- if (last_blkno <= (vp->v_cstart + vp->v_clen)) {
- /*
- * we have a write that fits entirely
- * within the existing cluster limits
- */
- if (last_blkno >= vp->v_lastw) {
- /*
- * if we're extending the dirty region within the cluster
- * we need to update the cluster info... we check for blkno
- * equality because we may be extending the file with a
- * partial write.... this in turn changes our idea of how
- * much data to write out (v_ciosiz) for the last page
- */
- vp->v_lastw = last_blkno;
- newsize = io_size + ((start_blkno - vp->v_cstart) * PAGE_SIZE);
+ commit_offset = (upl_offset + (PAGE_SIZE - 1)) & ~PAGE_MASK;
- if (newsize > vp->v_ciosiz)
- vp->v_ciosiz = newsize;
- }
- can_delay = 1;
- goto finish_io;
- }
- if (start_blkno < (vp->v_cstart + vp->v_clen)) {
- /*
- * we have a write that starts in the middle of the current cluster
- * but extends beyond the cluster's limit
- * we'll clip the current cluster if we actually
- * overlap with the new write and then push it out
- * and start a new cluster with the current write
- */
- if (vp->v_lastw > start_blkno) {
- vp->v_lastw = start_blkno;
- vp->v_ciosiz = (vp->v_lastw - vp->v_cstart) * PAGE_SIZE;
- }
- }
- /*
- * we also get here for the case where the current write starts
- * beyond the limit of the existing cluster
+ pg_resid = commit_offset - upl_offset;
+
+ if (bytes_to_zero >= pg_resid) {
+ /*
+ * the last page of the current I/O
+ * has been completed...
+ * compute the number of fully zero'd
+ * pages that are beyond it
+ * plus the last page if its partial
+ * and we have no more I/O to issue...
+ * otherwise a partial page is left
+ * to begin the next I/O
*/
- must_push = 1;
- goto check_delay;
+ if ((int)io_size >= non_rounded_size)
+ pg_count = (bytes_to_zero - pg_resid + (PAGE_SIZE - 1)) / PAGE_SIZE;
+ else
+ pg_count = (bytes_to_zero - pg_resid) / PAGE_SIZE;
+
+ complete_transaction_now = 1;
}
- /*
- * the current write starts in front of the current cluster
+ } else {
+ /*
+ * no pending I/O to deal with
+ * so, commit all of the fully zero'd pages
+ * plus the last page if its partial
+ * and we have no more I/O to issue...
+ * otherwise a partial page is left
+ * to begin the next I/O
*/
- if (last_blkno > vp->v_cstart) {
- /*
- * the current write extends into the existing cluster
- */
- if ((vp->v_lastw - start_blkno) > vp->v_clen) {
- /*
- * if we were to combine this write with the current cluster
- * we would exceed the cluster size limit....
- * clip the current cluster by moving the start position
- * to where the current write ends, and then push it
- */
- vp->v_ciosiz -= (last_blkno - vp->v_cstart) * PAGE_SIZE;
- vp->v_cstart = last_blkno;
+ if ((int)io_size >= non_rounded_size)
+ pg_count = (pg_offset + bytes_to_zero + (PAGE_SIZE - 1)) / PAGE_SIZE;
+ else
+ pg_count = (pg_offset + bytes_to_zero) / PAGE_SIZE;
- /*
- * round up the io_size to the nearest page size
- * since we've coalesced with at least 1 pre-existing
- * page in the current cluster... this write may have ended in the
- * middle of the page which would cause io_size to give us an
- * inaccurate view of how much I/O we actually need to do
- */
- io_size = (io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
+ commit_offset = upl_offset & ~PAGE_MASK;
+ }
- must_push = 1;
- goto check_delay;
- }
- /*
- * we can coalesce the current write with the existing cluster
- * adjust the cluster info to reflect this
- */
- if (last_blkno > vp->v_lastw) {
- /*
- * the current write completey overlaps
- * the existing cluster
- */
- vp->v_lastw = last_blkno;
- vp->v_ciosiz = io_size;
- } else {
- vp->v_ciosiz += (vp->v_cstart - start_blkno) * PAGE_SIZE;
+ // Associated UPL is currently only used in the direct write path
+ assert(!upl_associated_upl(upl));
- if (io_size > vp->v_ciosiz)
- vp->v_ciosiz = io_size;
- }
- vp->v_cstart = start_blkno;
- can_delay = 1;
- goto finish_io;
- }
- /*
- * this I/O range is entirely in front of the current cluster
- * so we need to push the current cluster out before beginning
- * a new one
+ if ( (flags & CL_COMMIT) && pg_count) {
+ ubc_upl_commit_range(upl, commit_offset, pg_count * PAGE_SIZE,
+ UPL_COMMIT_CLEAR_DIRTY | UPL_COMMIT_FREE_ON_EMPTY);
+ }
+ upl_offset += io_size;
+ f_offset += io_size;
+ size -= io_size;
+
+ /*
+ * keep track of how much of the original request
+ * that we've actually completed... non_rounded_size
+ * may go negative due to us rounding the request
+ * to a page size multiple (i.e. size > non_rounded_size)
+ */
+ non_rounded_size -= io_size;
+
+ if (non_rounded_size <= 0) {
+ /*
+ * we've transferred all of the data in the original
+ * request, but we were unable to complete the tail
+ * of the last page because the file didn't have
+ * an allocation to back that portion... this is ok.
*/
- must_push = 1;
+ size = 0;
}
-check_delay:
- if (must_push)
- cluster_push(vp);
+ if (cbp_head && (complete_transaction_now || size == 0)) {
+ cluster_wait_IO(cbp_head, (flags & CL_ASYNC));
- if (io_size_before_rounding < (MAX_UPL_TRANSFER * PAGE_SIZE) && !(flags & IO_SYNC)) {
- vp->v_clen = MAX_UPL_TRANSFER;
- vp->v_cstart = start_blkno;
- vp->v_lastw = last_blkno;
- vp->v_ciosiz = io_size;
-
- can_delay = 1;
+ cluster_EOT(cbp_head, cbp_tail, size == 0 ? zero_offset : 0);
+
+ cluster_complete_transaction(&cbp_head, callback_arg, &retval, flags, 0);
+
+ trans_count = 0;
}
-finish_io:
- if (can_delay) {
- ubc_upl_commit_range(upl, 0, upl_size,
- UPL_COMMIT_SET_DIRTY | UPL_COMMIT_FREE_ON_EMPTY);
- continue;
+ continue;
+ }
+ if (pg_count > max_vectors) {
+ if (((pg_count - max_vectors) * PAGE_SIZE) > io_size) {
+ io_size = PAGE_SIZE - pg_offset;
+ pg_count = 1;
+ } else {
+ io_size -= (pg_count - max_vectors) * PAGE_SIZE;
+ pg_count = max_vectors;
}
- if (flags & IO_SYNC)
- io_flags = CL_COMMIT | CL_AGE;
- else
- io_flags = CL_COMMIT | CL_AGE | CL_ASYNC;
+ }
+ /*
+ * If the transaction is going to reach the maximum number of
+ * desired elements, truncate the i/o to the nearest page so
+ * that the actual i/o is initiated after this buffer is
+ * created and added to the i/o chain.
+ *
+ * I/O directed to physically contiguous memory
+ * doesn't have a requirement to make sure we 'fill' a page
+ */
+ if ( !(flags & CL_DEV_MEMORY) && trans_count >= max_trans_count &&
+ ((upl_offset + io_size) & PAGE_MASK)) {
+ vm_offset_t aligned_ofs;
+
+ aligned_ofs = (upl_offset + io_size) & ~PAGE_MASK;
+ /*
+ * If the io_size does not actually finish off even a
+ * single page we have to keep adding buffers to the
+ * transaction despite having reached the desired limit.
+ *
+ * Eventually we get here with the page being finished
+ * off (and exceeded) and then we truncate the size of
+ * this i/o request so that it is page aligned so that
+ * we can finally issue the i/o on the transaction.
+ */
+ if (aligned_ofs > upl_offset) {
+ io_size = aligned_ofs - upl_offset;
+ pg_count--;
+ }
+ }
+
+ if ( !(mp->mnt_kern_flag & MNTK_VIRTUALDEV))
+ /*
+ * if we're not targeting a virtual device i.e. a disk image
+ * it's safe to dip into the reserve pool since real devices
+ * can complete this I/O request without requiring additional
+ * bufs from the alloc_io_buf pool
+ */
+ priv = 1;
+ else if ((flags & CL_ASYNC) && !(flags & CL_PAGEOUT))
+ /*
+ * Throttle the speculative IO
+ */
+ priv = 0;
+ else
+ priv = 1;
+
+ cbp = alloc_io_buf(vp, priv);
- if (vp->v_flag & VNOCACHE_DATA)
- io_flags |= CL_DUMP;
+ if (flags & CL_PAGEOUT) {
+ u_int i;
- while (vp->v_numoutput >= ASYNC_THROTTLE) {
- vp->v_flag |= VTHROTTLED;
- tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "cluster_write", 0);
- }
- retval = cluster_io(vp, upl, 0, upl_f_offset, io_size,
- io_flags, (struct buf *)0);
+ /*
+ * since blocks are in offsets of 0x1000, scale
+ * iteration to (PAGE_SIZE * pg_count) of blks.
+ */
+ for (i = 0; i < (PAGE_SIZE * pg_count)/0x1000; i++) {
+ if (buf_invalblkno(vp, lblkno + i, 0) == EBUSY)
+ panic("BUSY bp found in cluster_io");
+ }
}
- }
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_END,
- retval, 0, 0, 0, 0);
+ if (flags & CL_ASYNC) {
+ if (buf_setcallback(cbp, (void *)cluster_iodone, callback_arg))
+ panic("buf_setcallback failed\n");
+ }
+ cbp->b_cliodone = (void *)callback;
+ cbp->b_flags |= io_flags;
+ if (flags & CL_NOCACHE)
+ cbp->b_attr.ba_flags |= BA_NOCACHE;
- return (retval);
-}
+ cbp->b_lblkno = lblkno;
+ cbp->b_blkno = blkno;
+ cbp->b_bcount = io_size;
-cluster_read(vp, uio, filesize, devblocksize, flags)
- struct vnode *vp;
- struct uio *uio;
- off_t filesize;
- int devblocksize;
- int flags;
-{
- int prev_resid;
- int clip_size;
- off_t max_io_size;
- struct iovec *iov;
- vm_offset_t upl_offset;
- int upl_size;
- int pages_in_pl;
- upl_page_info_t *pl;
- int upl_flags;
- upl_t upl;
- int retval = 0;
+ if (buf_setupl(cbp, upl, upl_offset))
+ panic("buf_setupl failed\n");
+#if CONFIG_IOSCHED
+ upl_set_blkno(upl, upl_offset, io_size, blkno);
+#endif
+ cbp->b_trans_next = (buf_t)NULL;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_START,
- (int)uio->uio_offset, uio->uio_resid, (int)filesize, devblocksize, 0);
+ if ((cbp->b_iostate = (void *)iostate))
+ /*
+ * caller wants to track the state of this
+ * io... bump the amount issued against this stream
+ */
+ iostate->io_issued += io_size;
- /*
- * We set a threshhold of 4 pages to decide if the nocopy
- * read loop is worth the trouble...
- */
+ if (flags & CL_READ) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 26)) | DBG_FUNC_NONE,
+ (int)cbp->b_lblkno, (int)cbp->b_blkno, upl_offset, io_size, 0);
+ }
+ else {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 27)) | DBG_FUNC_NONE,
+ (int)cbp->b_lblkno, (int)cbp->b_blkno, upl_offset, io_size, 0);
+ }
- if (!((vp->v_flag & VNOCACHE_DATA) && (uio->uio_segflg == UIO_USERSPACE)))
- {
- retval = cluster_read_x(vp, uio, filesize, devblocksize, flags);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_END,
- (int)uio->uio_offset, uio->uio_resid, vp->v_lastr, retval, 0);
- return(retval);
- }
-
- while (uio->uio_resid && uio->uio_offset < filesize && retval == 0)
- {
- /* we know we have a resid, so this is safe */
- iov = uio->uio_iov;
- while (iov->iov_len == 0) {
- uio->uio_iov++;
- uio->uio_iovcnt--;
- iov = uio->uio_iov;
- }
-
- /*
- * We check every vector target and if it is physically
- * contiguous space, we skip the sanity checks.
- */
-
- upl_offset = (vm_offset_t)iov->iov_base & ~PAGE_MASK;
- upl_size = (upl_offset + PAGE_SIZE +(PAGE_SIZE -1)) & ~PAGE_MASK;
- pages_in_pl = 0;
- upl_flags = UPL_QUERY_OBJECT_TYPE;
- if((vm_map_get_upl(current_map(),
- (vm_offset_t)iov->iov_base & ~PAGE_MASK,
- &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0)) != KERN_SUCCESS)
- {
- /*
- * the user app must have passed in an invalid address
- */
- return (EFAULT);
- }
+ if (cbp_head) {
+ cbp_tail->b_trans_next = cbp;
+ cbp_tail = cbp;
+ } else {
+ cbp_head = cbp;
+ cbp_tail = cbp;
+
+ if ( (cbp_head->b_real_bp = real_bp) )
+ real_bp = (buf_t)NULL;
+ }
+ *(buf_t *)(&cbp->b_trans_head) = cbp_head;
+
+ trans_count++;
- if (upl_flags & UPL_PHYS_CONTIG)
- {
- retval = cluster_phys_read(vp, uio, filesize);
- }
- else if (uio->uio_resid < 4 * PAGE_SIZE)
- {
+ upl_offset += io_size;
+ f_offset += io_size;
+ size -= io_size;
/*
- * We set a threshhold of 4 pages to decide if the nocopy
- * read loop is worth the trouble...
+ * keep track of how much of the original request
+ * that we've actually completed... non_rounded_size
+ * may go negative due to us rounding the request
+ * to a page size multiple (i.e. size > non_rounded_size)
*/
- retval = cluster_read_x(vp, uio, filesize, devblocksize, flags);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_END,
- (int)uio->uio_offset, uio->uio_resid, vp->v_lastr, retval, 0);
- return(retval);
- }
- else if (uio->uio_offset & PAGE_MASK_64)
- {
- /* Bring the file offset read up to a pagesize boundary */
- clip_size = (PAGE_SIZE - (int)(uio->uio_offset & PAGE_MASK_64));
- if (uio->uio_resid < clip_size)
- clip_size = uio->uio_resid;
- /*
- * Fake the resid going into the cluster_read_x call
- * and restore it on the way out.
- */
- prev_resid = uio->uio_resid;
- uio->uio_resid = clip_size;
- retval = cluster_read_x(vp, uio, filesize, devblocksize, flags);
- uio->uio_resid = prev_resid - (clip_size - uio->uio_resid);
- }
- else if ((int)iov->iov_base & PAGE_MASK_64)
- {
- clip_size = iov->iov_len;
- prev_resid = uio->uio_resid;
- uio->uio_resid = clip_size;
- retval = cluster_read_x(vp, uio, filesize, devblocksize, flags);
- uio->uio_resid = prev_resid - (clip_size - uio->uio_resid);
- }
- else
- {
- /*
- * If we come in here, we know the offset into
- * the file is on a pagesize boundary
- */
-
- max_io_size = filesize - uio->uio_offset;
- clip_size = uio->uio_resid;
- if (iov->iov_len < clip_size)
- clip_size = iov->iov_len;
- if (max_io_size < clip_size)
- clip_size = (int)max_io_size;
-
- if (clip_size < PAGE_SIZE)
- {
- /*
- * Take care of the tail end of the read in this vector.
- */
- prev_resid = uio->uio_resid;
- uio->uio_resid = clip_size;
- retval = cluster_read_x(vp, uio, filesize, devblocksize, flags);
- uio->uio_resid = prev_resid - (clip_size - uio->uio_resid);
- }
- else
- {
- /* round clip_size down to a multiple of pagesize */
- clip_size = clip_size & ~(PAGE_MASK);
- prev_resid = uio->uio_resid;
- uio->uio_resid = clip_size;
- retval = cluster_nocopy_read(vp, uio, filesize, devblocksize, flags);
- if ((retval==0) && uio->uio_resid)
- retval = cluster_read_x(vp, uio, filesize, devblocksize, flags);
- uio->uio_resid = prev_resid - (clip_size - uio->uio_resid);
- }
- } /* end else */
- } /* end while */
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_END,
- (int)uio->uio_offset, uio->uio_resid, vp->v_lastr, retval, 0);
+ non_rounded_size -= io_size;
- return(retval);
-}
+ if (non_rounded_size <= 0) {
+ /*
+ * we've transferred all of the data in the original
+ * request, but we were unable to complete the tail
+ * of the last page because the file didn't have
+ * an allocation to back that portion... this is ok.
+ */
+ size = 0;
+ }
+ if (size == 0) {
+ /*
+ * we have no more I/O to issue, so go
+ * finish the final transaction
+ */
+ need_EOT = TRUE;
+ } else if ( ((flags & CL_DEV_MEMORY) || (upl_offset & PAGE_MASK) == 0) &&
+ ((flags & CL_ASYNC) || trans_count > max_trans_count) ) {
+ /*
+ * I/O directed to physically contiguous memory...
+ * which doesn't have a requirement to make sure we 'fill' a page
+ * or...
+ * the current I/O we've prepared fully
+ * completes the last page in this request
+ * and ...
+ * it's either an ASYNC request or
+ * we've already accumulated more than 8 I/O's into
+ * this transaction so mark it as complete so that
+ * it can finish asynchronously or via the cluster_complete_transaction
+ * below if the request is synchronous
+ */
+ need_EOT = TRUE;
+ }
+ if (need_EOT == TRUE)
+ cluster_EOT(cbp_head, cbp_tail, size == 0 ? zero_offset : 0);
-static
-cluster_read_x(vp, uio, filesize, devblocksize, flags)
- struct vnode *vp;
- struct uio *uio;
- off_t filesize;
- int devblocksize;
- int flags;
-{
- upl_page_info_t *pl;
- upl_t upl;
- vm_offset_t upl_offset;
- int upl_size;
- off_t upl_f_offset;
- int start_offset;
- int start_pg;
- int last_pg;
- int uio_last;
- int pages_in_upl;
- off_t max_size;
- int io_size;
- vm_offset_t io_address;
- kern_return_t kret;
- int segflg;
- int error = 0;
- int retval = 0;
- int b_lblkno;
- int e_lblkno;
+ if (flags & CL_THROTTLE)
+ (void)vnode_waitforwrites(vp, async_throttle, 0, 0, "cluster_io");
- b_lblkno = (int)(uio->uio_offset / PAGE_SIZE_64);
+ if ( !(io_flags & B_READ))
+ vnode_startwrite(vp);
+
+ if (flags & CL_RAW_ENCRYPTED) {
+ /*
+ * User requested raw encrypted bytes.
+ * Twiddle the bit in the ba_flags for the buffer
+ */
+ cbp->b_attr.ba_flags |= BA_RAW_ENCRYPTED_IO;
+ }
+
+ (void) VNOP_STRATEGY(cbp);
- while (uio->uio_resid && uio->uio_offset < filesize && retval == 0) {
- /*
- * compute the size of the upl needed to encompass
- * the requested read... limit each call to cluster_io
- * to the maximum UPL size... cluster_io will clip if
- * this exceeds the maximum io_size for the device,
- * make sure to account for
- * a starting offset that's not page aligned
- */
- start_offset = (int)(uio->uio_offset & PAGE_MASK_64);
- upl_f_offset = uio->uio_offset - (off_t)start_offset;
- max_size = filesize - uio->uio_offset;
+ if (need_EOT == TRUE) {
+ if ( !(flags & CL_ASYNC))
+ cluster_complete_transaction(&cbp_head, callback_arg, &retval, flags, 1);
- if ((off_t)((unsigned int)uio->uio_resid) < max_size)
- io_size = uio->uio_resid;
- else
- io_size = max_size;
-#ifdef ppc
- if (uio->uio_segflg == UIO_USERSPACE && !(vp->v_flag & VNOCACHE_DATA)) {
- segflg = uio->uio_segflg;
+ need_EOT = FALSE;
+ trans_count = 0;
+ cbp_head = NULL;
+ }
+ }
+ if (error) {
+ int abort_size;
- uio->uio_segflg = UIO_PHYS_USERSPACE;
+ io_size = 0;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_START,
- (int)uio->uio_offset, io_size, uio->uio_resid, 0, 0);
+ if (cbp_head) {
+ /*
+ * Wait until all of the outstanding I/O
+ * for this partial transaction has completed
+ */
+ cluster_wait_IO(cbp_head, (flags & CL_ASYNC));
- while (io_size && retval == 0) {
- int xsize;
- vm_offset_t paddr;
+ /*
+ * Rewind the upl offset to the beginning of the
+ * transaction.
+ */
+ upl_offset = cbp_head->b_uploffset;
+ }
- if (ubc_page_op(vp,
- upl_f_offset,
- UPL_POP_SET | UPL_POP_BUSY,
- &paddr, 0) != KERN_SUCCESS)
- break;
+ if (ISSET(flags, CL_COMMIT)) {
+ cluster_handle_associated_upl(iostate, upl, upl_offset,
+ upl_end_offset - upl_offset);
+ }
- xsize = PAGE_SIZE - start_offset;
-
- if (xsize > io_size)
- xsize = io_size;
+ // Free all the IO buffers in this transaction
+ for (cbp = cbp_head; cbp;) {
+ buf_t cbp_next;
+
+ size += cbp->b_bcount;
+ io_size += cbp->b_bcount;
- retval = uiomove((caddr_t)(paddr + start_offset), xsize, uio);
+ cbp_next = cbp->b_trans_next;
+ free_io_buf(cbp);
+ cbp = cbp_next;
+ }
- ubc_page_op(vp, upl_f_offset,
- UPL_POP_CLR | UPL_POP_BUSY, 0, 0);
+ if (iostate) {
+ int need_wakeup = 0;
- io_size -= xsize;
- start_offset = (int)
- (uio->uio_offset & PAGE_MASK_64);
- upl_f_offset = uio->uio_offset - start_offset;
- }
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END,
- (int)uio->uio_offset, io_size, uio->uio_resid, 0, 0);
+ /*
+ * update the error condition for this stream
+ * since we never really issued the io
+ * just go ahead and adjust it back
+ */
+ lck_mtx_lock_spin(&iostate->io_mtxp);
- uio->uio_segflg = segflg;
-
- if (retval)
- break;
+ if (iostate->io_error == 0)
+ iostate->io_error = error;
+ iostate->io_issued -= io_size;
- if (io_size == 0) {
+ if (iostate->io_wanted) {
/*
- * we're already finished with this read request
- * let's see if we should do a read-ahead
+ * someone is waiting for the state of
+ * this io stream to change
*/
- e_lblkno = (int)
- ((uio->uio_offset - 1) / PAGE_SIZE_64);
-
- if (!(vp->v_flag & VRAOFF))
- /*
- * let's try to read ahead if we're in
- * a sequential access pattern
- */
- cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize);
- vp->v_lastr = e_lblkno;
-
- break;
+ iostate->io_wanted = 0;
+ need_wakeup = 1;
}
- max_size = filesize - uio->uio_offset;
+ lck_mtx_unlock(&iostate->io_mtxp);
+
+ if (need_wakeup)
+ wakeup((caddr_t)&iostate->io_wanted);
}
-#endif
- upl_size = (start_offset + io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
- if (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE))
- upl_size = MAX_UPL_TRANSFER * PAGE_SIZE;
- pages_in_upl = upl_size / PAGE_SIZE;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 33)) | DBG_FUNC_START,
- upl, (int)upl_f_offset, upl_size, start_offset, 0);
+ if (flags & CL_COMMIT) {
+ int upl_flags;
- kret = ubc_create_upl(vp,
- upl_f_offset,
- upl_size,
- &upl,
- &pl,
- UPL_FLAGS_NONE);
- if (kret != KERN_SUCCESS)
- panic("cluster_read: failed to get pagelist");
+ pg_offset = upl_offset & PAGE_MASK;
+ abort_size = (upl_end_offset - upl_offset + PAGE_MASK) & ~PAGE_MASK;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 33)) | DBG_FUNC_END,
- upl, (int)upl_f_offset, upl_size, start_offset, 0);
+ upl_flags = cluster_ioerror(upl, upl_offset - pg_offset, abort_size, error, io_flags, vp);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 28)) | DBG_FUNC_NONE,
+ upl, upl_offset - pg_offset, abort_size, (error << 24) | upl_flags, 0);
+ }
+ if (retval == 0)
+ retval = error;
+ } else if (cbp_head)
+ panic("%s(): cbp_head is not NULL.\n", __FUNCTION__);
- /*
- * scan from the beginning of the upl looking for the first
- * non-valid page.... this will become the first page in
- * the request we're going to make to 'cluster_io'... if all
- * of the pages are valid, we won't call through to 'cluster_io'
+ if (real_bp) {
+ /*
+ * can get here if we either encountered an error
+ * or we completely zero-filled the request and
+ * no I/O was issued
*/
- for (start_pg = 0; start_pg < pages_in_upl; start_pg++) {
- if (!upl_valid_page(pl, start_pg))
- break;
+ if (error) {
+ real_bp->b_flags |= B_ERROR;
+ real_bp->b_error = error;
}
+ buf_biodone(real_bp);
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_END, (int)f_offset, size, upl_offset, retval, 0);
- /*
- * scan from the starting invalid page looking for a valid
- * page before the end of the upl is reached, if we
- * find one, then it will be the last page of the request to
- * 'cluster_io'
- */
- for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) {
- if (upl_valid_page(pl, last_pg))
- break;
- }
+ return (retval);
+}
- if (start_pg < last_pg) {
- /*
- * we found a range of 'invalid' pages that must be filled
- * if the last page in this range is the last page of the file
- * we may have to clip the size of it to keep from reading past
- * the end of the last physical block associated with the file
- */
- upl_offset = start_pg * PAGE_SIZE;
- io_size = (last_pg - start_pg) * PAGE_SIZE;
+#define reset_vector_run_state() \
+ issueVectorUPL = vector_upl_offset = vector_upl_index = vector_upl_iosize = vector_upl_size = 0;
- if ((upl_f_offset + upl_offset + io_size) > filesize) {
- io_size = filesize - (upl_f_offset + upl_offset);
- io_size = (io_size + (devblocksize - 1)) & ~(devblocksize - 1);
- }
- /*
- * issue a synchronous read to cluster_io
- */
+static int
+vector_cluster_io(vnode_t vp, upl_t vector_upl, vm_offset_t vector_upl_offset, off_t v_upl_uio_offset, int vector_upl_iosize,
+ int io_flag, buf_t real_bp, struct clios *iostate, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ vector_upl_set_pagelist(vector_upl);
- error = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset,
- io_size, CL_READ, (struct buf *)0);
- }
- if (error == 0) {
- /*
- * if the read completed successfully, or there was no I/O request
- * issued, than map the upl into kernel address space and
- * move the data into user land.... we'll first add on any 'valid'
- * pages that were present in the upl when we acquired it.
- */
- u_int val_size;
- u_int size_of_prefetch;
+ if(io_flag & CL_READ) {
+ if(vector_upl_offset == 0 && ((vector_upl_iosize & PAGE_MASK)==0))
+ io_flag &= ~CL_PRESERVE; /*don't zero fill*/
+ else
+ io_flag |= CL_PRESERVE; /*zero fill*/
+ }
+ return (cluster_io(vp, vector_upl, vector_upl_offset, v_upl_uio_offset, vector_upl_iosize, io_flag, real_bp, iostate, callback, callback_arg));
- for (uio_last = last_pg; uio_last < pages_in_upl; uio_last++) {
- if (!upl_valid_page(pl, uio_last))
- break;
- }
- /*
- * compute size to transfer this round, if uio->uio_resid is
- * still non-zero after this uiomove, we'll loop around and
- * set up for another I/O.
- */
- val_size = (uio_last * PAGE_SIZE) - start_offset;
-
- if (max_size < val_size)
- val_size = max_size;
+}
- if (uio->uio_resid < val_size)
- val_size = uio->uio_resid;
+static int
+cluster_read_prefetch(vnode_t vp, off_t f_offset, u_int size, off_t filesize, int (*callback)(buf_t, void *), void *callback_arg, int bflag)
+{
+ int pages_in_prefetch;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_START,
+ (int)f_offset, size, (int)filesize, 0, 0);
- e_lblkno = (int)((uio->uio_offset + ((off_t)val_size - 1)) / PAGE_SIZE_64);
+ if (f_offset >= filesize) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_END,
+ (int)f_offset, 0, 0, 0, 0);
+ return(0);
+ }
+ if ((off_t)size > (filesize - f_offset))
+ size = filesize - f_offset;
+ pages_in_prefetch = (size + (PAGE_SIZE - 1)) / PAGE_SIZE;
- if (size_of_prefetch = (uio->uio_resid - val_size)) {
- /*
- * if there's still I/O left to do for this request, then issue a
- * pre-fetch I/O... the I/O wait time will overlap
- * with the copying of the data
- */
- cluster_rd_prefetch(vp, uio->uio_offset + val_size, size_of_prefetch, filesize, devblocksize);
- } else {
- if (!(vp->v_flag & VRAOFF) && !(vp->v_flag & VNOCACHE_DATA))
- /*
- * let's try to read ahead if we're in
- * a sequential access pattern
- */
- cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize);
- vp->v_lastr = e_lblkno;
- }
-#ifdef ppc
- if (uio->uio_segflg == UIO_USERSPACE) {
- int offset;
+ advisory_read_ext(vp, filesize, f_offset, size, callback, callback_arg, bflag);
- segflg = uio->uio_segflg;
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_END,
+ (int)f_offset + size, pages_in_prefetch, 0, 1, 0);
- uio->uio_segflg = UIO_PHYS_USERSPACE;
+ return (pages_in_prefetch);
+}
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_START,
- (int)uio->uio_offset, val_size, uio->uio_resid, 0, 0);
- offset = start_offset;
+static void
+cluster_read_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl_readahead *rap, int (*callback)(buf_t, void *), void *callback_arg,
+ int bflag)
+{
+ daddr64_t r_addr;
+ off_t f_offset;
+ int size_of_prefetch;
+ u_int max_prefetch;
- while (val_size && retval == 0) {
- int csize;
- int i;
- caddr_t paddr;
- i = offset / PAGE_SIZE;
- csize = min(PAGE_SIZE - start_offset, val_size);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_START,
+ (int)extent->b_addr, (int)extent->e_addr, (int)rap->cl_lastr, 0, 0);
- paddr = (caddr_t)upl_phys_page(pl, i) + start_offset;
+ if (extent->b_addr == rap->cl_lastr && extent->b_addr == extent->e_addr) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END,
+ rap->cl_ralen, (int)rap->cl_maxra, (int)rap->cl_lastr, 0, 0);
+ return;
+ }
+ if (rap->cl_lastr == -1 || (extent->b_addr != rap->cl_lastr && extent->b_addr != (rap->cl_lastr + 1))) {
+ rap->cl_ralen = 0;
+ rap->cl_maxra = 0;
- retval = uiomove(paddr, csize, uio);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END,
+ rap->cl_ralen, (int)rap->cl_maxra, (int)rap->cl_lastr, 1, 0);
- val_size -= csize;
- offset += csize;
- start_offset = offset & PAGE_MASK;
- }
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END,
- (int)uio->uio_offset, val_size, uio->uio_resid, 0, 0);
+ return;
+ }
+ max_prefetch = MAX_PREFETCH(vp, cluster_max_io_size(vp->v_mount, CL_READ), (vp->v_mount->mnt_kern_flag & MNTK_SSD));
- uio->uio_segflg = segflg;
- } else
-#endif
- {
- if ((kret = ubc_upl_map(upl, &io_address)) != KERN_SUCCESS)
- panic("cluster_read: ubc_upl_map() failed\n");
+ if (max_prefetch > speculative_prefetch_max)
+ max_prefetch = speculative_prefetch_max;
- retval = uiomove((caddr_t)(io_address + start_offset), val_size, uio);
+ if (max_prefetch <= PAGE_SIZE) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END,
+ rap->cl_ralen, (int)rap->cl_maxra, (int)rap->cl_lastr, 6, 0);
+ return;
+ }
+ if (extent->e_addr < rap->cl_maxra && rap->cl_ralen >= 4) {
+ if ((rap->cl_maxra - extent->e_addr) > (rap->cl_ralen / 4)) {
- if ((kret = ubc_upl_unmap(upl)) != KERN_SUCCESS)
- panic("cluster_read: ubc_upl_unmap() failed\n");
- }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END,
+ rap->cl_ralen, (int)rap->cl_maxra, (int)rap->cl_lastr, 2, 0);
+ return;
}
- if (start_pg < last_pg) {
- /*
- * compute the range of pages that we actually issued an I/O for
- * and either commit them as valid if the I/O succeeded
- * or abort them if the I/O failed
- */
- io_size = (last_pg - start_pg) * PAGE_SIZE;
+ }
+ r_addr = max(extent->e_addr, rap->cl_maxra) + 1;
+ f_offset = (off_t)(r_addr * PAGE_SIZE_64);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_START,
- upl, start_pg * PAGE_SIZE, io_size, error, 0);
+ size_of_prefetch = 0;
- if (error || (vp->v_flag & VNOCACHE_DATA))
- ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, io_size,
- UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY);
- else
- ubc_upl_commit_range(upl, start_pg * PAGE_SIZE, io_size,
- UPL_COMMIT_CLEAR_DIRTY
- | UPL_COMMIT_FREE_ON_EMPTY
- | UPL_COMMIT_INACTIVATE);
+ ubc_range_op(vp, f_offset, f_offset + PAGE_SIZE_64, UPL_ROP_PRESENT, &size_of_prefetch);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END,
- upl, start_pg * PAGE_SIZE, io_size, error, 0);
- }
- if ((last_pg - start_pg) < pages_in_upl) {
- int cur_pg;
- int commit_flags;
+ if (size_of_prefetch) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END,
+ rap->cl_ralen, (int)rap->cl_maxra, (int)rap->cl_lastr, 3, 0);
+ return;
+ }
+ if (f_offset < filesize) {
+ daddr64_t read_size;
- /*
- * the set of pages that we issued an I/O for did not encompass
- * the entire upl... so just release these without modifying
- * there state
- */
- if (error)
- ubc_upl_abort(upl, 0);
- else {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_START,
- upl, -1, pages_in_upl - (last_pg - start_pg), 0, 0);
+ rap->cl_ralen = rap->cl_ralen ? min(max_prefetch / PAGE_SIZE, rap->cl_ralen << 1) : 1;
- if (start_pg) {
- /*
- * we found some already valid pages at the beginning of
- * the upl commit these back to the inactive list with
- * reference cleared
- */
- for (cur_pg = 0; cur_pg < start_pg; cur_pg++) {
- commit_flags = UPL_COMMIT_FREE_ON_EMPTY
- | UPL_COMMIT_INACTIVATE;
-
- if (upl_dirty_page(pl, cur_pg))
- commit_flags |= UPL_COMMIT_SET_DIRTY;
-
- if ( !(commit_flags & UPL_COMMIT_SET_DIRTY) && (vp->v_flag & VNOCACHE_DATA))
- ubc_upl_abort_range(upl, cur_pg * PAGE_SIZE, PAGE_SIZE,
- UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY);
- else
- ubc_upl_commit_range(upl, cur_pg * PAGE_SIZE,
- PAGE_SIZE, commit_flags);
- }
- }
- if (last_pg < uio_last) {
- /*
- * we found some already valid pages immediately after the
- * pages we issued I/O for, commit these back to the
- * inactive list with reference cleared
- */
- for (cur_pg = last_pg; cur_pg < uio_last; cur_pg++) {
- commit_flags = UPL_COMMIT_FREE_ON_EMPTY
- | UPL_COMMIT_INACTIVATE;
-
- if (upl_dirty_page(pl, cur_pg))
- commit_flags |= UPL_COMMIT_SET_DIRTY;
-
- if ( !(commit_flags & UPL_COMMIT_SET_DIRTY) && (vp->v_flag & VNOCACHE_DATA))
- ubc_upl_abort_range(upl, cur_pg * PAGE_SIZE, PAGE_SIZE,
- UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY);
- else
- ubc_upl_commit_range(upl, cur_pg * PAGE_SIZE,
- PAGE_SIZE, commit_flags);
- }
- }
- if (uio_last < pages_in_upl) {
- /*
- * there were some invalid pages beyond the valid pages
- * that we didn't issue an I/O for, just release them
- * unchanged
- */
- ubc_upl_abort(upl, 0);
- }
+ read_size = (extent->e_addr + 1) - extent->b_addr;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END,
- upl, -1, -1, 0, 0);
- }
+ if (read_size > rap->cl_ralen) {
+ if (read_size > max_prefetch / PAGE_SIZE)
+ rap->cl_ralen = max_prefetch / PAGE_SIZE;
+ else
+ rap->cl_ralen = read_size;
}
- if (retval == 0)
- retval = error;
- }
+ size_of_prefetch = cluster_read_prefetch(vp, f_offset, rap->cl_ralen * PAGE_SIZE, filesize, callback, callback_arg, bflag);
- return (retval);
+ if (size_of_prefetch)
+ rap->cl_maxra = (r_addr + size_of_prefetch) - 1;
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END,
+ rap->cl_ralen, (int)rap->cl_maxra, (int)rap->cl_lastr, 4, 0);
}
-static
-cluster_nocopy_read(vp, uio, filesize, devblocksize, flags)
- struct vnode *vp;
- struct uio *uio;
- off_t filesize;
- int devblocksize;
- int flags;
-{
- upl_t upl;
- upl_page_info_t *pl;
- off_t upl_f_offset;
- vm_offset_t upl_offset;
- off_t start_upl_f_offset;
- off_t max_io_size;
- int io_size;
- int upl_size;
- int upl_needed_size;
- int pages_in_pl;
- vm_offset_t paddr;
- int upl_flags;
- kern_return_t kret;
- int segflg;
- struct iovec *iov;
- int i;
- int force_data_sync;
- int error = 0;
- int retval = 0;
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_START,
- (int)uio->uio_offset, uio->uio_resid, (int)filesize, devblocksize, 0);
-
- /*
- * When we enter this routine, we know
- * -- the offset into the file is on a pagesize boundary
- * -- the resid is a page multiple
- * -- the resid will not exceed iov_len
- */
- iov = uio->uio_iov;
- while (uio->uio_resid && uio->uio_offset < filesize && retval == 0) {
+int
+cluster_pageout(vnode_t vp, upl_t upl, upl_offset_t upl_offset, off_t f_offset,
+ int size, off_t filesize, int flags)
+{
+ return cluster_pageout_ext(vp, upl, upl_offset, f_offset, size, filesize, flags, NULL, NULL);
- max_io_size = filesize - uio->uio_offset;
+}
- if (max_io_size < (off_t)((unsigned int)uio->uio_resid))
- io_size = max_io_size;
- else
- io_size = uio->uio_resid;
- /*
- * We don't come into this routine unless
- * UIO_USERSPACE is set.
- */
- segflg = uio->uio_segflg;
+int
+cluster_pageout_ext(vnode_t vp, upl_t upl, upl_offset_t upl_offset, off_t f_offset,
+ int size, off_t filesize, int flags, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ int io_size;
+ int rounded_size;
+ off_t max_size;
+ int local_flags;
- uio->uio_segflg = UIO_PHYS_USERSPACE;
+ local_flags = CL_PAGEOUT | CL_THROTTLE;
- /*
- * First look for pages already in the cache
- * and move them to user space.
- */
- while (io_size && (retval == 0)) {
- upl_f_offset = uio->uio_offset;
+ if ((flags & UPL_IOSYNC) == 0)
+ local_flags |= CL_ASYNC;
+ if ((flags & UPL_NOCOMMIT) == 0)
+ local_flags |= CL_COMMIT;
+ if ((flags & UPL_KEEPCACHED))
+ local_flags |= CL_KEEPCACHED;
+ if (flags & UPL_PAGING_ENCRYPTED)
+ local_flags |= CL_ENCRYPTED;
- /*
- * If this call fails, it means the page is not
- * in the page cache.
- */
- if (ubc_page_op(vp, upl_f_offset,
- UPL_POP_SET | UPL_POP_BUSY, &paddr, 0) != KERN_SUCCESS)
- break;
- retval = uiomove((caddr_t)(paddr), PAGE_SIZE, uio);
-
- ubc_page_op(vp, upl_f_offset,
- UPL_POP_CLR | UPL_POP_BUSY, 0, 0);
-
- io_size -= PAGE_SIZE;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 71)) | DBG_FUNC_NONE,
- (int)uio->uio_offset, io_size, uio->uio_resid, 0, 0);
- }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 52)) | DBG_FUNC_NONE,
+ (int)f_offset, size, (int)filesize, local_flags, 0);
- uio->uio_segflg = segflg;
-
- if (retval)
- {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_END,
- (int)uio->uio_offset, uio->uio_resid, 2, retval, 0);
- return(retval);
- }
-
- /* If we are already finished with this read, then return */
- if (io_size == 0)
- {
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_END,
- (int)uio->uio_offset, uio->uio_resid, 3, io_size, 0);
- return(0);
- }
-
- max_io_size = io_size;
- if (max_io_size > (MAX_UPL_TRANSFER * PAGE_SIZE))
- max_io_size = MAX_UPL_TRANSFER * PAGE_SIZE;
-
- start_upl_f_offset = uio->uio_offset; /* this is page aligned in the file */
- upl_f_offset = start_upl_f_offset;
- io_size = 0;
-
- while(io_size < max_io_size)
- {
-
- if(ubc_page_op(vp, upl_f_offset,
- UPL_POP_SET | UPL_POP_BUSY, &paddr, 0) == KERN_SUCCESS)
- {
- ubc_page_op(vp, upl_f_offset,
- UPL_POP_CLR | UPL_POP_BUSY, 0, 0);
- break;
- }
+ /*
+ * If they didn't specify any I/O, then we are done...
+ * we can't issue an abort because we don't know how
+ * big the upl really is
+ */
+ if (size <= 0)
+ return (EINVAL);
- /*
- * Build up the io request parameters.
- */
+ if (vp->v_mount->mnt_flag & MNT_RDONLY) {
+ if (local_flags & CL_COMMIT)
+ ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY);
+ return (EROFS);
+ }
+ /*
+ * can't page-in from a negative offset
+ * or if we're starting beyond the EOF
+ * or if the file offset isn't page aligned
+ * or the size requested isn't a multiple of PAGE_SIZE
+ */
+ if (f_offset < 0 || f_offset >= filesize ||
+ (f_offset & PAGE_MASK_64) || (size & PAGE_MASK)) {
+ if (local_flags & CL_COMMIT)
+ ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY);
+ return (EINVAL);
+ }
+ max_size = filesize - f_offset;
- io_size += PAGE_SIZE;
- upl_f_offset += PAGE_SIZE;
- }
+ if (size < max_size)
+ io_size = size;
+ else
+ io_size = max_size;
- if (io_size == 0)
- return(retval);
+ rounded_size = (io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
- upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK_64;
- upl_needed_size = (upl_offset + io_size + (PAGE_SIZE -1)) & ~PAGE_MASK;
+ if (size > rounded_size) {
+ if (local_flags & CL_COMMIT)
+ ubc_upl_abort_range(upl, upl_offset + rounded_size, size - rounded_size,
+ UPL_ABORT_FREE_ON_EMPTY);
+ }
+ return (cluster_io(vp, upl, upl_offset, f_offset, io_size,
+ local_flags, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg));
+}
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_START,
- (int)upl_offset, upl_needed_size, iov->iov_base, io_size, 0);
- for (force_data_sync = 0; force_data_sync < 3; force_data_sync++)
- {
- pages_in_pl = 0;
- upl_size = upl_needed_size;
- upl_flags = UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL;
+int
+cluster_pagein(vnode_t vp, upl_t upl, upl_offset_t upl_offset, off_t f_offset,
+ int size, off_t filesize, int flags)
+{
+ return cluster_pagein_ext(vp, upl, upl_offset, f_offset, size, filesize, flags, NULL, NULL);
+}
- kret = vm_map_get_upl(current_map(),
- (vm_offset_t)iov->iov_base & ~PAGE_MASK,
- &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, force_data_sync);
- if (kret != KERN_SUCCESS)
- {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END,
- (int)upl_offset, upl_size, io_size, kret, 0);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_END,
- (int)uio->uio_offset, uio->uio_resid, 4, retval, 0);
+int
+cluster_pagein_ext(vnode_t vp, upl_t upl, upl_offset_t upl_offset, off_t f_offset,
+ int size, off_t filesize, int flags, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ u_int io_size;
+ int rounded_size;
+ off_t max_size;
+ int retval;
+ int local_flags = 0;
- /* cluster_nocopy_read: failed to get pagelist */
- /* do not return kret here */
- return(retval);
- }
+ if (upl == NULL || size < 0)
+ panic("cluster_pagein: NULL upl passed in");
- pages_in_pl = upl_size / PAGE_SIZE;
- pl = UPL_GET_INTERNAL_PAGE_LIST(upl);
+ if ((flags & UPL_IOSYNC) == 0)
+ local_flags |= CL_ASYNC;
+ if ((flags & UPL_NOCOMMIT) == 0)
+ local_flags |= CL_COMMIT;
+ if (flags & UPL_IOSTREAMING)
+ local_flags |= CL_IOSTREAMING;
+ if (flags & UPL_PAGING_ENCRYPTED)
+ local_flags |= CL_ENCRYPTED;
- for(i=0; i < pages_in_pl; i++)
- {
- if (!upl_valid_page(pl, i))
- break;
- }
- if (i == pages_in_pl)
- break;
- ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size,
- UPL_ABORT_FREE_ON_EMPTY);
- }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 56)) | DBG_FUNC_NONE,
+ (int)f_offset, size, (int)filesize, local_flags, 0);
- if (force_data_sync >= 3)
- {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END,
- (int)upl_offset, upl_size, io_size, kret, 0);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_END,
- (int)uio->uio_offset, uio->uio_resid, 5, retval, 0);
- return(retval);
- }
- /*
- * Consider the possibility that upl_size wasn't satisfied.
- */
- if (upl_size != upl_needed_size)
- io_size = (upl_size - (int)upl_offset) & ~PAGE_MASK;
-
- if (io_size == 0)
- {
- ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size,
- UPL_ABORT_FREE_ON_EMPTY);
- return(retval);
- }
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END,
- (int)upl_offset, upl_size, io_size, kret, 0);
-
- /*
- * issue a synchronous read to cluster_io
- */
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_START,
- upl, (int)upl_offset, (int)start_upl_f_offset, io_size, 0);
-
- error = cluster_io(vp, upl, upl_offset, start_upl_f_offset,
- io_size, CL_READ| CL_NOZERO, (struct buf *)0);
-
- if (error == 0) {
- /*
- * The cluster_io read completed successfully,
- * update the uio structure and commit.
- */
-
- ubc_upl_commit_range(upl, (upl_offset & ~PAGE_MASK), upl_size,
- UPL_COMMIT_SET_DIRTY | UPL_COMMIT_FREE_ON_EMPTY);
-
- iov->iov_base += io_size;
- iov->iov_len -= io_size;
- uio->uio_resid -= io_size;
- uio->uio_offset += io_size;
- }
- else {
- ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size,
- UPL_ABORT_FREE_ON_EMPTY);
- }
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_END,
- upl, (int)uio->uio_offset, (int)uio->uio_resid, error, 0);
-
- if (retval == 0)
- retval = error;
+ /*
+ * can't page-in from a negative offset
+ * or if we're starting beyond the EOF
+ * or if the file offset isn't page aligned
+ * or the size requested isn't a multiple of PAGE_SIZE
+ */
+ if (f_offset < 0 || f_offset >= filesize ||
+ (f_offset & PAGE_MASK_64) || (size & PAGE_MASK) || (upl_offset & PAGE_MASK)) {
+ if (local_flags & CL_COMMIT)
+ ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR);
+ return (EINVAL);
+ }
+ max_size = filesize - f_offset;
- } /* end while */
+ if (size < max_size)
+ io_size = size;
+ else
+ io_size = max_size;
+ rounded_size = (io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_END,
- (int)uio->uio_offset, (int)uio->uio_resid, 6, retval, 0);
+ if (size > rounded_size && (local_flags & CL_COMMIT))
+ ubc_upl_abort_range(upl, upl_offset + rounded_size,
+ size - rounded_size, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR);
+
+ retval = cluster_io(vp, upl, upl_offset, f_offset, io_size,
+ local_flags | CL_READ | CL_PAGEIN, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg);
return (retval);
}
-static
-cluster_phys_read(vp, uio, filesize)
- struct vnode *vp;
- struct uio *uio;
- off_t filesize;
+int
+cluster_bp(buf_t bp)
{
- upl_t upl;
- vm_offset_t upl_offset;
- off_t max_size;
- int io_size;
- int upl_size;
- int upl_needed_size;
- int pages_in_pl;
- int upl_flags;
- kern_return_t kret;
- struct iovec *iov;
- int error;
+ return cluster_bp_ext(bp, NULL, NULL);
+}
- /*
- * When we enter this routine, we know
- * -- the resid will not exceed iov_len
- * -- the target address is physically contiguous
- */
- iov = uio->uio_iov;
+int
+cluster_bp_ext(buf_t bp, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ off_t f_offset;
+ int flags;
- max_size = filesize - uio->uio_offset;
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 19)) | DBG_FUNC_START,
+ bp, (int)bp->b_lblkno, bp->b_bcount, bp->b_flags, 0);
- if (max_size < (off_t)((unsigned int)iov->iov_len))
- io_size = max_size;
+ if (bp->b_flags & B_READ)
+ flags = CL_ASYNC | CL_READ;
else
- io_size = iov->iov_len;
+ flags = CL_ASYNC;
+ if (bp->b_flags & B_PASSIVE)
+ flags |= CL_PASSIVE;
- upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK_64;
- upl_needed_size = upl_offset + io_size;
+ f_offset = ubc_blktooff(bp->b_vp, bp->b_lblkno);
- pages_in_pl = 0;
- upl_size = upl_needed_size;
- upl_flags = UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL;
+ return (cluster_io(bp->b_vp, bp->b_upl, 0, f_offset, bp->b_bcount, flags, bp, (struct clios *)NULL, callback, callback_arg));
+}
- kret = vm_map_get_upl(current_map(),
- (vm_offset_t)iov->iov_base & ~PAGE_MASK,
- &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0);
- if (kret != KERN_SUCCESS)
- {
- /* cluster_phys_read: failed to get pagelist */
- return(EINVAL);
- }
- /*
- * Consider the possibility that upl_size wasn't satisfied.
- */
- if (upl_size < upl_needed_size)
- {
- ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
- return(EINVAL);
- }
+int
+cluster_write(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t headOff, off_t tailOff, int xflags)
+{
+ return cluster_write_ext(vp, uio, oldEOF, newEOF, headOff, tailOff, xflags, NULL, NULL);
+}
- /*
- * issue a synchronous read to cluster_io
- */
- error = cluster_io(vp, upl, upl_offset, uio->uio_offset,
- io_size, CL_READ| CL_NOZERO | CL_DEV_MEMORY, (struct buf *)0);
-
- if (error == 0)
- {
- /*
- * The cluster_io read completed successfully,
- * update the uio structure and commit.
- */
-
- ubc_upl_commit_range(upl, 0, upl_size, UPL_COMMIT_FREE_ON_EMPTY);
-
- iov->iov_base += io_size;
- iov->iov_len -= io_size;
- uio->uio_resid -= io_size;
- uio->uio_offset += io_size;
- }
+int
+cluster_write_ext(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t headOff, off_t tailOff,
+ int xflags, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ user_ssize_t cur_resid;
+ int retval = 0;
+ int flags;
+ int zflags;
+ int bflag;
+ int write_type = IO_COPY;
+ u_int32_t write_length;
+
+ flags = xflags;
+
+ if (flags & IO_PASSIVE)
+ bflag = CL_PASSIVE;
else
- ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
-
- return (error);
-}
+ bflag = 0;
-/*
- * generate advisory I/O's in the largest chunks possible
- * the completed pages will be released into the VM cache
- */
-advisory_read(vp, filesize, f_offset, resid, devblocksize)
- struct vnode *vp;
- off_t filesize;
- off_t f_offset;
- int resid;
- int devblocksize;
+ if (vp->v_flag & VNOCACHE_DATA){
+ flags |= IO_NOCACHE;
+ bflag |= CL_NOCACHE;
+ }
+ if (uio == NULL) {
+ /*
+ * no user data...
+ * this call is being made to zero-fill some range in the file
+ */
+ retval = cluster_write_copy(vp, NULL, (u_int32_t)0, oldEOF, newEOF, headOff, tailOff, flags, callback, callback_arg);
+
+ return(retval);
+ }
+ /*
+ * do a write through the cache if one of the following is true....
+ * NOCACHE is not true or NODIRECT is true
+ * the uio request doesn't target USERSPACE
+ * otherwise, find out if we want the direct or contig variant for
+ * the first vector in the uio request
+ */
+ if ( ((flags & (IO_NOCACHE | IO_NODIRECT)) == IO_NOCACHE) && UIO_SEG_IS_USER_SPACE(uio->uio_segflg) )
+ retval = cluster_io_type(uio, &write_type, &write_length, MIN_DIRECT_WRITE_SIZE);
+
+ if ( (flags & (IO_TAILZEROFILL | IO_HEADZEROFILL)) && write_type == IO_DIRECT)
+ /*
+ * must go through the cached variant in this case
+ */
+ write_type = IO_COPY;
+
+ while ((cur_resid = uio_resid(uio)) && uio->uio_offset < newEOF && retval == 0) {
+
+ switch (write_type) {
+
+ case IO_COPY:
+ /*
+ * make sure the uio_resid isn't too big...
+ * internally, we want to handle all of the I/O in
+ * chunk sizes that fit in a 32 bit int
+ */
+ if (cur_resid > (user_ssize_t)(MAX_IO_REQUEST_SIZE)) {
+ /*
+ * we're going to have to call cluster_write_copy
+ * more than once...
+ *
+ * only want the last call to cluster_write_copy to
+ * have the IO_TAILZEROFILL flag set and only the
+ * first call should have IO_HEADZEROFILL
+ */
+ zflags = flags & ~IO_TAILZEROFILL;
+ flags &= ~IO_HEADZEROFILL;
+
+ write_length = MAX_IO_REQUEST_SIZE;
+ } else {
+ /*
+ * last call to cluster_write_copy
+ */
+ zflags = flags;
+
+ write_length = (u_int32_t)cur_resid;
+ }
+ retval = cluster_write_copy(vp, uio, write_length, oldEOF, newEOF, headOff, tailOff, zflags, callback, callback_arg);
+ break;
+
+ case IO_CONTIG:
+ zflags = flags & ~(IO_TAILZEROFILL | IO_HEADZEROFILL);
+
+ if (flags & IO_HEADZEROFILL) {
+ /*
+ * only do this once per request
+ */
+ flags &= ~IO_HEADZEROFILL;
+
+ retval = cluster_write_copy(vp, (struct uio *)0, (u_int32_t)0, (off_t)0, uio->uio_offset,
+ headOff, (off_t)0, zflags | IO_HEADZEROFILL | IO_SYNC, callback, callback_arg);
+ if (retval)
+ break;
+ }
+ retval = cluster_write_contig(vp, uio, newEOF, &write_type, &write_length, callback, callback_arg, bflag);
+
+ if (retval == 0 && (flags & IO_TAILZEROFILL) && uio_resid(uio) == 0) {
+ /*
+ * we're done with the data from the user specified buffer(s)
+ * and we've been requested to zero fill at the tail
+ * treat this as an IO_HEADZEROFILL which doesn't require a uio
+ * by rearranging the args and passing in IO_HEADZEROFILL
+ */
+ retval = cluster_write_copy(vp, (struct uio *)0, (u_int32_t)0, (off_t)0, tailOff, uio->uio_offset,
+ (off_t)0, zflags | IO_HEADZEROFILL | IO_SYNC, callback, callback_arg);
+ }
+ break;
+
+ case IO_DIRECT:
+ /*
+ * cluster_write_direct is never called with IO_TAILZEROFILL || IO_HEADZEROFILL
+ */
+ retval = cluster_write_direct(vp, uio, oldEOF, newEOF, &write_type, &write_length, flags, callback, callback_arg);
+ break;
+
+ case IO_UNKNOWN:
+ retval = cluster_io_type(uio, &write_type, &write_length, MIN_DIRECT_WRITE_SIZE);
+ break;
+ }
+ /*
+ * in case we end up calling cluster_write_copy (from cluster_write_direct)
+ * multiple times to service a multi-vector request that is not aligned properly
+ * we need to update the oldEOF so that we
+ * don't zero-fill the head of a page if we've successfully written
+ * data to that area... 'cluster_write_copy' will zero-fill the head of a
+ * page that is beyond the oldEOF if the write is unaligned... we only
+ * want that to happen for the very first page of the cluster_write,
+ * NOT the first page of each vector making up a multi-vector write.
+ */
+ if (uio->uio_offset > oldEOF)
+ oldEOF = uio->uio_offset;
+ }
+ return (retval);
+}
+
+
+static int
+cluster_write_direct(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, int *write_type, u_int32_t *write_length,
+ int flags, int (*callback)(buf_t, void *), void *callback_arg)
{
- upl_page_info_t *pl;
upl_t upl;
+ upl_page_info_t *pl;
vm_offset_t upl_offset;
- int upl_size;
- off_t upl_f_offset;
- int start_offset;
- int start_pg;
- int last_pg;
- int pages_in_upl;
- off_t max_size;
- int io_size;
+ vm_offset_t vector_upl_offset = 0;
+ u_int32_t io_req_size;
+ u_int32_t offset_in_file;
+ u_int32_t offset_in_iovbase;
+ u_int32_t io_size;
+ int io_flag = 0;
+ upl_size_t upl_size, vector_upl_size = 0;
+ vm_size_t upl_needed_size;
+ mach_msg_type_number_t pages_in_pl;
+ upl_control_flags_t upl_flags;
kern_return_t kret;
+ mach_msg_type_number_t i;
+ int force_data_sync;
int retval = 0;
+ int first_IO = 1;
+ struct clios iostate;
+ user_addr_t iov_base;
+ u_int32_t mem_alignment_mask;
+ u_int32_t devblocksize;
+ u_int32_t max_io_size;
+ u_int32_t max_upl_size;
+ u_int32_t max_vector_size;
+ u_int32_t bytes_outstanding_limit;
+ boolean_t io_throttled = FALSE;
+
+ u_int32_t vector_upl_iosize = 0;
+ int issueVectorUPL = 0,useVectorUPL = (uio->uio_iovcnt > 1);
+ off_t v_upl_uio_offset = 0;
+ int vector_upl_index=0;
+ upl_t vector_upl = NULL;
- if (!UBCINFOEXISTS(vp))
- return(EINVAL);
+ /*
+ * When we enter this routine, we know
+ * -- the resid will not exceed iov_len
+ */
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_START,
+ (int)uio->uio_offset, *write_length, (int)newEOF, 0, 0);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 60)) | DBG_FUNC_START,
- (int)f_offset, resid, (int)filesize, devblocksize, 0);
+ max_upl_size = cluster_max_io_size(vp->v_mount, CL_WRITE);
- while (resid && f_offset < filesize && retval == 0) {
- /*
- * compute the size of the upl needed to encompass
- * the requested read... limit each call to cluster_io
- * to the maximum UPL size... cluster_io will clip if
- * this exceeds the maximum io_size for the device,
- * make sure to account for
- * a starting offset that's not page aligned
- */
- start_offset = (int)(f_offset & PAGE_MASK_64);
- upl_f_offset = f_offset - (off_t)start_offset;
- max_size = filesize - f_offset;
+ io_flag = CL_ASYNC | CL_PRESERVE | CL_COMMIT | CL_THROTTLE | CL_DIRECT_IO;
- if (resid < max_size)
- io_size = resid;
- else
- io_size = max_size;
+ if (flags & IO_PASSIVE)
+ io_flag |= CL_PASSIVE;
+
+ if (flags & IO_NOCACHE)
+ io_flag |= CL_NOCACHE;
+
+ if (flags & IO_SKIP_ENCRYPTION)
+ io_flag |= CL_ENCRYPTED;
+
+ iostate.io_completed = 0;
+ iostate.io_issued = 0;
+ iostate.io_error = 0;
+ iostate.io_wanted = 0;
+
+ lck_mtx_init(&iostate.io_mtxp, cl_mtx_grp, cl_mtx_attr);
+
+ mem_alignment_mask = (u_int32_t)vp->v_mount->mnt_alignmentmask;
+ devblocksize = (u_int32_t)vp->v_mount->mnt_devblocksize;
+
+ if (devblocksize == 1) {
+ /*
+ * the AFP client advertises a devblocksize of 1
+ * however, its BLOCKMAP routine maps to physical
+ * blocks that are PAGE_SIZE in size...
+ * therefore we can't ask for I/Os that aren't page aligned
+ * or aren't multiples of PAGE_SIZE in size
+ * by setting devblocksize to PAGE_SIZE, we re-instate
+ * the old behavior we had before the mem_alignment_mask
+ * changes went in...
+ */
+ devblocksize = PAGE_SIZE;
+ }
- upl_size = (start_offset + io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
- if (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE))
- upl_size = MAX_UPL_TRANSFER * PAGE_SIZE;
- pages_in_upl = upl_size / PAGE_SIZE;
+next_dwrite:
+ io_req_size = *write_length;
+ iov_base = uio_curriovbase(uio);
- kret = ubc_create_upl(vp,
- upl_f_offset,
- upl_size,
- &upl,
- &pl,
- UPL_FLAGS_NONE);
- if (kret != KERN_SUCCESS)
- panic("advisory_read: failed to get pagelist");
+ offset_in_file = (u_int32_t)uio->uio_offset & PAGE_MASK;
+ offset_in_iovbase = (u_int32_t)iov_base & mem_alignment_mask;
+ if (offset_in_file || offset_in_iovbase) {
+ /*
+ * one of the 2 important offsets is misaligned
+ * so fire an I/O through the cache for this entire vector
+ */
+ goto wait_for_dwrites;
+ }
+ if (iov_base & (devblocksize - 1)) {
+ /*
+ * the offset in memory must be on a device block boundary
+ * so that we can guarantee that we can generate an
+ * I/O that ends on a page boundary in cluster_io
+ */
+ goto wait_for_dwrites;
+ }
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 61)) | DBG_FUNC_NONE,
- upl, (int)upl_f_offset, upl_size, start_offset, 0);
+ task_update_logical_writes(current_task(), (io_req_size & ~PAGE_MASK), TASK_WRITE_IMMEDIATE, vp);
+ while (io_req_size >= PAGE_SIZE && uio->uio_offset < newEOF && retval == 0) {
+ int throttle_type;
- /*
- * scan from the beginning of the upl looking for the first
- * non-valid page.... this will become the first page in
- * the request we're going to make to 'cluster_io'... if all
- * of the pages are valid, we won't call through to 'cluster_io'
- */
- for (start_pg = 0; start_pg < pages_in_upl; start_pg++) {
- if (!upl_valid_page(pl, start_pg))
- break;
+ if ( (throttle_type = cluster_is_throttled(vp)) ) {
+ /*
+ * we're in the throttle window, at the very least
+ * we want to limit the size of the I/O we're about
+ * to issue
+ */
+ if ( (flags & IO_RETURN_ON_THROTTLE) && throttle_type == THROTTLE_NOW) {
+ /*
+ * we're in the throttle window and at least 1 I/O
+ * has already been issued by a throttleable thread
+ * in this window, so return with EAGAIN to indicate
+ * to the FS issuing the cluster_write call that it
+ * should now throttle after dropping any locks
+ */
+ throttle_info_update_by_mount(vp->v_mount);
+
+ io_throttled = TRUE;
+ goto wait_for_dwrites;
+ }
+ max_vector_size = THROTTLE_MAX_IOSIZE;
+ max_io_size = THROTTLE_MAX_IOSIZE;
+ } else {
+ max_vector_size = MAX_VECTOR_UPL_SIZE;
+ max_io_size = max_upl_size;
}
- /*
- * scan from the starting invalid page looking for a valid
- * page before the end of the upl is reached, if we
- * find one, then it will be the last page of the request to
- * 'cluster_io'
- */
- for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) {
- if (upl_valid_page(pl, last_pg))
- break;
+ if (first_IO) {
+ cluster_syncup(vp, newEOF, callback, callback_arg, callback ? PUSH_SYNC : 0);
+ first_IO = 0;
}
+ io_size = io_req_size & ~PAGE_MASK;
+ iov_base = uio_curriovbase(uio);
- if (start_pg < last_pg) {
- /*
- * we found a range of 'invalid' pages that must be filled
- * if the last page in this range is the last page of the file
- * we may have to clip the size of it to keep from reading past
- * the end of the last physical block associated with the file
+ if (io_size > max_io_size)
+ io_size = max_io_size;
+
+ if(useVectorUPL && (iov_base & PAGE_MASK)) {
+ /*
+ * We have an iov_base that's not page-aligned.
+ * Issue all I/O's that have been collected within
+ * this Vectored UPL.
*/
- upl_offset = start_pg * PAGE_SIZE;
- io_size = (last_pg - start_pg) * PAGE_SIZE;
+ if(vector_upl_index) {
+ retval = vector_cluster_io(vp, vector_upl, vector_upl_offset, v_upl_uio_offset, vector_upl_iosize, io_flag, (buf_t)NULL, &iostate, callback, callback_arg);
+ reset_vector_run_state();
+ }
+
+ /*
+ * After this point, if we are using the Vector UPL path and the base is
+ * not page-aligned then the UPL with that base will be the first in the vector UPL.
+ */
+ }
- if ((upl_f_offset + upl_offset + io_size) > filesize) {
- io_size = filesize - (upl_f_offset + upl_offset);
- io_size = (io_size + (devblocksize - 1)) & ~(devblocksize - 1);
+ upl_offset = (vm_offset_t)((u_int32_t)iov_base & PAGE_MASK);
+ upl_needed_size = (upl_offset + io_size + (PAGE_SIZE -1)) & ~PAGE_MASK;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_START,
+ (int)upl_offset, upl_needed_size, (int)iov_base, io_size, 0);
+
+ vm_map_t map = UIO_SEG_IS_USER_SPACE(uio->uio_segflg) ? current_map() : kernel_map;
+ for (force_data_sync = 0; force_data_sync < 3; force_data_sync++) {
+ pages_in_pl = 0;
+ upl_size = upl_needed_size;
+ upl_flags = UPL_FILE_IO | UPL_COPYOUT_FROM | UPL_NO_SYNC |
+ UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL | UPL_SET_LITE | UPL_SET_IO_WIRE
+ | UPL_MEMORY_TAG_MAKE(VM_KERN_MEMORY_FILE);
+
+ kret = vm_map_get_upl(map,
+ (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)),
+ &upl_size,
+ &upl,
+ NULL,
+ &pages_in_pl,
+ &upl_flags,
+ force_data_sync);
+
+ if (kret != KERN_SUCCESS) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END,
+ 0, 0, 0, kret, 0);
+ /*
+ * failed to get pagelist
+ *
+ * we may have already spun some portion of this request
+ * off as async requests... we need to wait for the I/O
+ * to complete before returning
+ */
+ goto wait_for_dwrites;
+ }
+ pl = UPL_GET_INTERNAL_PAGE_LIST(upl);
+ pages_in_pl = upl_size / PAGE_SIZE;
+
+ for (i = 0; i < pages_in_pl; i++) {
+ if (!upl_valid_page(pl, i))
+ break;
}
+ if (i == pages_in_pl)
+ break;
+
/*
- * issue an asynchronous read to cluster_io
+ * didn't get all the pages back that we
+ * needed... release this upl and try again
*/
- retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size,
- CL_ASYNC | CL_READ | CL_COMMIT | CL_AGE, (struct buf *)0);
+ ubc_upl_abort(upl, 0);
}
- if (start_pg) {
+ if (force_data_sync >= 3) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END,
+ i, pages_in_pl, upl_size, kret, 0);
/*
- * start_pg of non-zero indicates we found some already valid pages
- * at the beginning of the upl.... we need to release these without
- * modifying there state
+ * for some reason, we couldn't acquire a hold on all
+ * the pages needed in the user's address space
+ *
+ * we may have already spun some portion of this request
+ * off as async requests... we need to wait for the I/O
+ * to complete before returning
*/
- ubc_upl_abort_range(upl, 0, start_pg * PAGE_SIZE,
- UPL_ABORT_FREE_ON_EMPTY);
+ goto wait_for_dwrites;
+ }
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 62)) | DBG_FUNC_NONE,
- upl, 0, start_pg * PAGE_SIZE, 0, 0);
+ /*
+ * Consider the possibility that upl_size wasn't satisfied.
+ */
+ if (upl_size < upl_needed_size) {
+ if (upl_size && upl_offset == 0)
+ io_size = upl_size;
+ else
+ io_size = 0;
}
- if (last_pg < pages_in_upl) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END,
+ (int)upl_offset, upl_size, (int)iov_base, io_size, 0);
+
+ if (io_size == 0) {
+ ubc_upl_abort(upl, 0);
/*
- * the set of pages that we issued an I/O for did not extend all the
- * way to the end of the upl..so just release them without modifying
- * there state
+ * we may have already spun some portion of this request
+ * off as async requests... we need to wait for the I/O
+ * to complete before returning
*/
- ubc_upl_abort_range(upl, last_pg * PAGE_SIZE, (pages_in_upl - last_pg) * PAGE_SIZE,
- UPL_ABORT_FREE_ON_EMPTY);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 63)) | DBG_FUNC_NONE,
- upl, last_pg * PAGE_SIZE,
- (pages_in_upl - last_pg) * PAGE_SIZE, 0, 0);
+ goto wait_for_dwrites;
}
- io_size = (last_pg * PAGE_SIZE) - start_offset;
- if (io_size > resid)
- io_size = resid;
- f_offset += io_size;
- resid -= io_size;
+ if(useVectorUPL) {
+ vm_offset_t end_off = ((iov_base + io_size) & PAGE_MASK);
+ if(end_off)
+ issueVectorUPL = 1;
+ /*
+ * After this point, if we are using a vector UPL, then
+ * either all the UPL elements end on a page boundary OR
+ * this UPL is the last element because it does not end
+ * on a page boundary.
+ */
+ }
+
+ /*
+ * we want push out these writes asynchronously so that we can overlap
+ * the preparation of the next I/O
+ * if there are already too many outstanding writes
+ * wait until some complete before issuing the next
+ */
+ if (vp->v_mount->mnt_minsaturationbytecount)
+ bytes_outstanding_limit = vp->v_mount->mnt_minsaturationbytecount;
+ else
+ bytes_outstanding_limit = max_upl_size * IO_SCALE(vp, 2);
+
+ cluster_iostate_wait(&iostate, bytes_outstanding_limit, "cluster_write_direct");
+
+ if (iostate.io_error) {
+ /*
+ * one of the earlier writes we issued ran into a hard error
+ * don't issue any more writes, cleanup the UPL
+ * that was just created but not used, then
+ * go wait for all writes that are part of this stream
+ * to complete before returning the error to the caller
+ */
+ ubc_upl_abort(upl, 0);
+
+ goto wait_for_dwrites;
+ }
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 77)) | DBG_FUNC_START,
+ (int)upl_offset, (int)uio->uio_offset, io_size, io_flag, 0);
+
+ if(!useVectorUPL)
+ retval = cluster_io(vp, upl, upl_offset, uio->uio_offset,
+ io_size, io_flag, (buf_t)NULL, &iostate, callback, callback_arg);
+
+ else {
+ if(!vector_upl_index) {
+ vector_upl = vector_upl_create(upl_offset);
+ v_upl_uio_offset = uio->uio_offset;
+ vector_upl_offset = upl_offset;
+ }
+
+ vector_upl_set_subupl(vector_upl,upl,upl_size);
+ vector_upl_set_iostate(vector_upl, upl, vector_upl_size, upl_size);
+ vector_upl_index++;
+ vector_upl_iosize += io_size;
+ vector_upl_size += upl_size;
+
+ if(issueVectorUPL || vector_upl_index == MAX_VECTOR_UPL_ELEMENTS || vector_upl_size >= max_vector_size) {
+ retval = vector_cluster_io(vp, vector_upl, vector_upl_offset, v_upl_uio_offset, vector_upl_iosize, io_flag, (buf_t)NULL, &iostate, callback, callback_arg);
+ reset_vector_run_state();
+ }
+ }
+
+ /*
+ * update the uio structure to
+ * reflect the I/O that we just issued
+ */
+ uio_update(uio, (user_size_t)io_size);
+
+ /*
+ * in case we end up calling through to cluster_write_copy to finish
+ * the tail of this request, we need to update the oldEOF so that we
+ * don't zero-fill the head of a page if we've successfully written
+ * data to that area... 'cluster_write_copy' will zero-fill the head of a
+ * page that is beyond the oldEOF if the write is unaligned... we only
+ * want that to happen for the very first page of the cluster_write,
+ * NOT the first page of each vector making up a multi-vector write.
+ */
+ if (uio->uio_offset > oldEOF)
+ oldEOF = uio->uio_offset;
+
+ io_req_size -= io_size;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 77)) | DBG_FUNC_END,
+ (int)upl_offset, (int)uio->uio_offset, io_req_size, retval, 0);
+
+ } /* end while */
+
+ if (retval == 0 && iostate.io_error == 0 && io_req_size == 0) {
+
+ retval = cluster_io_type(uio, write_type, write_length, MIN_DIRECT_WRITE_SIZE);
+
+ if (retval == 0 && *write_type == IO_DIRECT) {
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_NONE,
+ (int)uio->uio_offset, *write_length, (int)newEOF, 0, 0);
+
+ goto next_dwrite;
+ }
+ }
+
+wait_for_dwrites:
+
+ if (retval == 0 && iostate.io_error == 0 && useVectorUPL && vector_upl_index) {
+ retval = vector_cluster_io(vp, vector_upl, vector_upl_offset, v_upl_uio_offset, vector_upl_iosize, io_flag, (buf_t)NULL, &iostate, callback, callback_arg);
+ reset_vector_run_state();
}
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 60)) | DBG_FUNC_END,
- (int)f_offset, resid, retval, 0, 0);
+ /*
+ * make sure all async writes issued as part of this stream
+ * have completed before we return
+ */
+ cluster_iostate_wait(&iostate, 0, "cluster_write_direct");
- return(retval);
+ if (iostate.io_error)
+ retval = iostate.io_error;
+
+ lck_mtx_destroy(&iostate.io_mtxp, cl_mtx_grp);
+
+ if (io_throttled == TRUE && retval == 0)
+ retval = EAGAIN;
+
+ if (io_req_size && retval == 0) {
+ /*
+ * we couldn't handle the tail of this request in DIRECT mode
+ * so fire it through the copy path
+ *
+ * note that flags will never have IO_HEADZEROFILL or IO_TAILZEROFILL set
+ * so we can just pass 0 in for the headOff and tailOff
+ */
+ if (uio->uio_offset > oldEOF)
+ oldEOF = uio->uio_offset;
+
+ retval = cluster_write_copy(vp, uio, io_req_size, oldEOF, newEOF, (off_t)0, (off_t)0, flags, callback, callback_arg);
+
+ *write_type = IO_UNKNOWN;
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_END,
+ (int)uio->uio_offset, io_req_size, retval, 4, 0);
+
+ return (retval);
}
-cluster_push(vp)
- struct vnode *vp;
+static int
+cluster_write_contig(vnode_t vp, struct uio *uio, off_t newEOF, int *write_type, u_int32_t *write_length,
+ int (*callback)(buf_t, void *), void *callback_arg, int bflag)
{
upl_page_info_t *pl;
- upl_t upl;
+ addr64_t src_paddr = 0;
+ upl_t upl[MAX_VECTS];
vm_offset_t upl_offset;
- int upl_size;
- off_t upl_f_offset;
- int pages_in_upl;
- int start_pg;
- int last_pg;
- int io_size;
- int io_flags;
- int size;
+ u_int32_t tail_size = 0;
+ u_int32_t io_size;
+ u_int32_t xsize;
+ upl_size_t upl_size;
+ vm_size_t upl_needed_size;
+ mach_msg_type_number_t pages_in_pl;
+ upl_control_flags_t upl_flags;
kern_return_t kret;
+ struct clios iostate;
+ int error = 0;
+ int cur_upl = 0;
+ int num_upl = 0;
+ int n;
+ user_addr_t iov_base;
+ u_int32_t devblocksize;
+ u_int32_t mem_alignment_mask;
+ /*
+ * When we enter this routine, we know
+ * -- the io_req_size will not exceed iov_len
+ * -- the target address is physically contiguous
+ */
+ cluster_syncup(vp, newEOF, callback, callback_arg, callback ? PUSH_SYNC : 0);
- if (!UBCINFOEXISTS(vp))
- return(0);
+ devblocksize = (u_int32_t)vp->v_mount->mnt_devblocksize;
+ mem_alignment_mask = (u_int32_t)vp->v_mount->mnt_alignmentmask;
- if (vp->v_clen == 0 || (pages_in_upl = vp->v_lastw - vp->v_cstart) == 0)
- return (0);
- upl_size = pages_in_upl * PAGE_SIZE;
- upl_f_offset = ((off_t)vp->v_cstart) * PAGE_SIZE_64;
- size = vp->v_ciosiz;
- vp->v_clen = 0;
+ iostate.io_completed = 0;
+ iostate.io_issued = 0;
+ iostate.io_error = 0;
+ iostate.io_wanted = 0;
- if (size > upl_size || (upl_size - size) > PAGE_SIZE)
- panic("cluster_push: v_ciosiz doesn't match size of cluster\n");
+ lck_mtx_init(&iostate.io_mtxp, cl_mtx_grp, cl_mtx_attr);
- kret = ubc_create_upl(vp,
- upl_f_offset,
- upl_size,
- &upl,
- &pl,
- UPL_FLAGS_NONE);
- if (kret != KERN_SUCCESS)
- panic("cluster_push: failed to get pagelist");
+next_cwrite:
+ io_size = *write_length;
- last_pg = 0;
+ iov_base = uio_curriovbase(uio);
- while (size) {
+ upl_offset = (vm_offset_t)((u_int32_t)iov_base & PAGE_MASK);
+ upl_needed_size = upl_offset + io_size;
- for (start_pg = last_pg; start_pg < pages_in_upl; start_pg++) {
- if (upl_valid_page(pl, start_pg) && upl_dirty_page(pl, start_pg))
- break;
- }
- if (start_pg > last_pg) {
- io_size = (start_pg - last_pg) * PAGE_SIZE;
+ pages_in_pl = 0;
+ upl_size = upl_needed_size;
+ upl_flags = UPL_FILE_IO | UPL_COPYOUT_FROM | UPL_NO_SYNC |
+ UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL | UPL_SET_LITE | UPL_SET_IO_WIRE
+ | UPL_MEMORY_TAG_MAKE(VM_KERN_MEMORY_FILE);
- ubc_upl_abort_range(upl, last_pg * PAGE_SIZE, io_size,
- UPL_ABORT_FREE_ON_EMPTY);
+ vm_map_t map = UIO_SEG_IS_USER_SPACE(uio->uio_segflg) ? current_map() : kernel_map;
+ kret = vm_map_get_upl(map,
+ (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)),
+ &upl_size, &upl[cur_upl], NULL, &pages_in_pl, &upl_flags, 0);
- if (io_size < size)
- size -= io_size;
- else
- break;
- }
- for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) {
- if (!upl_valid_page(pl, last_pg) || !upl_dirty_page(pl, last_pg))
- break;
- }
- upl_offset = start_pg * PAGE_SIZE;
+ if (kret != KERN_SUCCESS) {
+ /*
+ * failed to get pagelist
+ */
+ error = EINVAL;
+ goto wait_for_cwrites;
+ }
+ num_upl++;
- io_size = min(size, (last_pg - start_pg) * PAGE_SIZE);
+ /*
+ * Consider the possibility that upl_size wasn't satisfied.
+ */
+ if (upl_size < upl_needed_size) {
+ /*
+ * This is a failure in the physical memory case.
+ */
+ error = EINVAL;
+ goto wait_for_cwrites;
+ }
+ pl = ubc_upl_pageinfo(upl[cur_upl]);
- if (vp->v_flag & VNOCACHE_DATA)
- io_flags = CL_COMMIT | CL_AGE | CL_ASYNC | CL_DUMP;
- else
- io_flags = CL_COMMIT | CL_AGE | CL_ASYNC;
+ src_paddr = ((addr64_t)upl_phys_page(pl, 0) << PAGE_SHIFT) + (addr64_t)upl_offset;
- while (vp->v_numoutput >= ASYNC_THROTTLE) {
- vp->v_flag |= VTHROTTLED;
- tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "cluster_push", 0);
+ while (((uio->uio_offset & (devblocksize - 1)) || io_size < devblocksize) && io_size) {
+ u_int32_t head_size;
+
+ head_size = devblocksize - (u_int32_t)(uio->uio_offset & (devblocksize - 1));
+
+ if (head_size > io_size)
+ head_size = io_size;
+
+ error = cluster_align_phys_io(vp, uio, src_paddr, head_size, 0, callback, callback_arg);
+
+ if (error)
+ goto wait_for_cwrites;
+
+ upl_offset += head_size;
+ src_paddr += head_size;
+ io_size -= head_size;
+
+ iov_base += head_size;
+ }
+ if ((u_int32_t)iov_base & mem_alignment_mask) {
+ /*
+ * request doesn't set up on a memory boundary
+ * the underlying DMA engine can handle...
+ * return an error instead of going through
+ * the slow copy path since the intent of this
+ * path is direct I/O from device memory
+ */
+ error = EINVAL;
+ goto wait_for_cwrites;
+ }
+
+ tail_size = io_size & (devblocksize - 1);
+ io_size -= tail_size;
+
+ while (io_size && error == 0) {
+
+ if (io_size > MAX_IO_CONTIG_SIZE)
+ xsize = MAX_IO_CONTIG_SIZE;
+ else
+ xsize = io_size;
+ /*
+ * request asynchronously so that we can overlap
+ * the preparation of the next I/O... we'll do
+ * the commit after all the I/O has completed
+ * since its all issued against the same UPL
+ * if there are already too many outstanding writes
+ * wait until some have completed before issuing the next
+ */
+ cluster_iostate_wait(&iostate, MAX_IO_CONTIG_SIZE * IO_SCALE(vp, 2), "cluster_write_contig");
+
+ if (iostate.io_error) {
+ /*
+ * one of the earlier writes we issued ran into a hard error
+ * don't issue any more writes...
+ * go wait for all writes that are part of this stream
+ * to complete before returning the error to the caller
+ */
+ goto wait_for_cwrites;
+ }
+ /*
+ * issue an asynchronous write to cluster_io
+ */
+ error = cluster_io(vp, upl[cur_upl], upl_offset, uio->uio_offset,
+ xsize, CL_DEV_MEMORY | CL_ASYNC | bflag, (buf_t)NULL, (struct clios *)&iostate, callback, callback_arg);
+
+ if (error == 0) {
+ /*
+ * The cluster_io write completed successfully,
+ * update the uio structure
+ */
+ uio_update(uio, (user_size_t)xsize);
+
+ upl_offset += xsize;
+ src_paddr += xsize;
+ io_size -= xsize;
+ }
+ }
+ if (error == 0 && iostate.io_error == 0 && tail_size == 0 && num_upl < MAX_VECTS) {
+
+ error = cluster_io_type(uio, write_type, write_length, 0);
+
+ if (error == 0 && *write_type == IO_CONTIG) {
+ cur_upl++;
+ goto next_cwrite;
+ }
+ } else
+ *write_type = IO_UNKNOWN;
+
+wait_for_cwrites:
+ /*
+ * make sure all async writes that are part of this stream
+ * have completed before we proceed
+ */
+ cluster_iostate_wait(&iostate, 0, "cluster_write_contig");
+
+ if (iostate.io_error)
+ error = iostate.io_error;
+
+ lck_mtx_destroy(&iostate.io_mtxp, cl_mtx_grp);
+
+ if (error == 0 && tail_size)
+ error = cluster_align_phys_io(vp, uio, src_paddr, tail_size, 0, callback, callback_arg);
+
+ for (n = 0; n < num_upl; n++)
+ /*
+ * just release our hold on each physically contiguous
+ * region without changing any state
+ */
+ ubc_upl_abort(upl[n], 0);
+
+ return (error);
+}
+
+
+/*
+ * need to avoid a race between an msync of a range of pages dirtied via mmap
+ * vs a filesystem such as HFS deciding to write a 'hole' to disk via cluster_write's
+ * zerofill mechanism before it has seen the VNOP_PAGEOUTs for the pages being msync'd
+ *
+ * we should never force-zero-fill pages that are already valid in the cache...
+ * the entire page contains valid data (either from disk, zero-filled or dirtied
+ * via an mmap) so we can only do damage by trying to zero-fill
+ *
+ */
+static int
+cluster_zero_range(upl_t upl, upl_page_info_t *pl, int flags, int io_offset, off_t zero_off, off_t upl_f_offset, int bytes_to_zero)
+{
+ int zero_pg_index;
+ boolean_t need_cluster_zero = TRUE;
+
+ if ((flags & (IO_NOZEROVALID | IO_NOZERODIRTY))) {
+
+ bytes_to_zero = min(bytes_to_zero, PAGE_SIZE - (int)(zero_off & PAGE_MASK_64));
+ zero_pg_index = (int)((zero_off - upl_f_offset) / PAGE_SIZE_64);
+
+ if (upl_valid_page(pl, zero_pg_index)) {
+ /*
+ * never force zero valid pages - dirty or clean
+ * we'll leave these in the UPL for cluster_write_copy to deal with
+ */
+ need_cluster_zero = FALSE;
+ }
+ }
+ if (need_cluster_zero == TRUE)
+ cluster_zero(upl, io_offset, bytes_to_zero, NULL);
+
+ return (bytes_to_zero);
+}
+
+
+static int
+cluster_write_copy(vnode_t vp, struct uio *uio, u_int32_t io_req_size, off_t oldEOF, off_t newEOF, off_t headOff,
+ off_t tailOff, int flags, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ upl_page_info_t *pl;
+ upl_t upl;
+ vm_offset_t upl_offset = 0;
+ vm_size_t upl_size;
+ off_t upl_f_offset;
+ int pages_in_upl;
+ int start_offset;
+ int xfer_resid;
+ int io_size;
+ int io_offset;
+ int bytes_to_zero;
+ int bytes_to_move;
+ kern_return_t kret;
+ int retval = 0;
+ int io_resid;
+ long long total_size;
+ long long zero_cnt;
+ off_t zero_off;
+ long long zero_cnt1;
+ off_t zero_off1;
+ off_t write_off = 0;
+ int write_cnt = 0;
+ boolean_t first_pass = FALSE;
+ struct cl_extent cl;
+ struct cl_writebehind *wbp;
+ int bflag;
+ u_int max_cluster_pgcount;
+ u_int max_io_size;
+
+ if (uio) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_START,
+ (int)uio->uio_offset, io_req_size, (int)oldEOF, (int)newEOF, 0);
+
+ io_resid = io_req_size;
+ } else {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_START,
+ 0, 0, (int)oldEOF, (int)newEOF, 0);
+
+ io_resid = 0;
+ }
+ if (flags & IO_PASSIVE)
+ bflag = CL_PASSIVE;
+ else
+ bflag = 0;
+ if (flags & IO_NOCACHE)
+ bflag |= CL_NOCACHE;
+
+ if (flags & IO_SKIP_ENCRYPTION)
+ bflag |= CL_ENCRYPTED;
+
+ zero_cnt = 0;
+ zero_cnt1 = 0;
+ zero_off = 0;
+ zero_off1 = 0;
+
+ max_cluster_pgcount = MAX_CLUSTER_SIZE(vp) / PAGE_SIZE;
+ max_io_size = cluster_max_io_size(vp->v_mount, CL_WRITE);
+
+ if (flags & IO_HEADZEROFILL) {
+ /*
+ * some filesystems (HFS is one) don't support unallocated holes within a file...
+ * so we zero fill the intervening space between the old EOF and the offset
+ * where the next chunk of real data begins.... ftruncate will also use this
+ * routine to zero fill to the new EOF when growing a file... in this case, the
+ * uio structure will not be provided
+ */
+ if (uio) {
+ if (headOff < uio->uio_offset) {
+ zero_cnt = uio->uio_offset - headOff;
+ zero_off = headOff;
+ }
+ } else if (headOff < newEOF) {
+ zero_cnt = newEOF - headOff;
+ zero_off = headOff;
+ }
+ } else {
+ if (uio && uio->uio_offset > oldEOF) {
+ zero_off = uio->uio_offset & ~PAGE_MASK_64;
+
+ if (zero_off >= oldEOF) {
+ zero_cnt = uio->uio_offset - zero_off;
+
+ flags |= IO_HEADZEROFILL;
+ }
+ }
+ }
+ if (flags & IO_TAILZEROFILL) {
+ if (uio) {
+ zero_off1 = uio->uio_offset + io_req_size;
+
+ if (zero_off1 < tailOff)
+ zero_cnt1 = tailOff - zero_off1;
+ }
+ } else {
+ if (uio && newEOF > oldEOF) {
+ zero_off1 = uio->uio_offset + io_req_size;
+
+ if (zero_off1 == newEOF && (zero_off1 & PAGE_MASK_64)) {
+ zero_cnt1 = PAGE_SIZE_64 - (zero_off1 & PAGE_MASK_64);
+
+ flags |= IO_TAILZEROFILL;
+ }
+ }
+ }
+ if (zero_cnt == 0 && uio == (struct uio *) 0) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_END,
+ retval, 0, 0, 0, 0);
+ return (0);
+ }
+ if (uio) {
+ write_off = uio->uio_offset;
+ write_cnt = uio_resid(uio);
+ /*
+ * delay updating the sequential write info
+ * in the control block until we've obtained
+ * the lock for it
+ */
+ first_pass = TRUE;
+ }
+ while ((total_size = (io_resid + zero_cnt + zero_cnt1)) && retval == 0) {
+ /*
+ * for this iteration of the loop, figure out where our starting point is
+ */
+ if (zero_cnt) {
+ start_offset = (int)(zero_off & PAGE_MASK_64);
+ upl_f_offset = zero_off - start_offset;
+ } else if (io_resid) {
+ start_offset = (int)(uio->uio_offset & PAGE_MASK_64);
+ upl_f_offset = uio->uio_offset - start_offset;
+ } else {
+ start_offset = (int)(zero_off1 & PAGE_MASK_64);
+ upl_f_offset = zero_off1 - start_offset;
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 46)) | DBG_FUNC_NONE,
+ (int)zero_off, (int)zero_cnt, (int)zero_off1, (int)zero_cnt1, 0);
+
+ if (total_size > max_io_size)
+ total_size = max_io_size;
+
+ cl.b_addr = (daddr64_t)(upl_f_offset / PAGE_SIZE_64);
+
+ if (uio && ((flags & (IO_SYNC | IO_HEADZEROFILL | IO_TAILZEROFILL)) == 0)) {
+ /*
+ * assumption... total_size <= io_resid
+ * because IO_HEADZEROFILL and IO_TAILZEROFILL not set
+ */
+ if ((start_offset + total_size) > max_io_size)
+ total_size = max_io_size - start_offset;
+ xfer_resid = total_size;
+
+ retval = cluster_copy_ubc_data_internal(vp, uio, &xfer_resid, 1, 1);
+
+ if (retval)
+ break;
+
+ io_resid -= (total_size - xfer_resid);
+ total_size = xfer_resid;
+ start_offset = (int)(uio->uio_offset & PAGE_MASK_64);
+ upl_f_offset = uio->uio_offset - start_offset;
+
+ if (total_size == 0) {
+ if (start_offset) {
+ /*
+ * the write did not finish on a page boundary
+ * which will leave upl_f_offset pointing to the
+ * beginning of the last page written instead of
+ * the page beyond it... bump it in this case
+ * so that the cluster code records the last page
+ * written as dirty
+ */
+ upl_f_offset += PAGE_SIZE_64;
+ }
+ upl_size = 0;
+
+ goto check_cluster;
+ }
+ }
+ /*
+ * compute the size of the upl needed to encompass
+ * the requested write... limit each call to cluster_io
+ * to the maximum UPL size... cluster_io will clip if
+ * this exceeds the maximum io_size for the device,
+ * make sure to account for
+ * a starting offset that's not page aligned
+ */
+ upl_size = (start_offset + total_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
+
+ if (upl_size > max_io_size)
+ upl_size = max_io_size;
+
+ pages_in_upl = upl_size / PAGE_SIZE;
+ io_size = upl_size - start_offset;
+
+ if ((long long)io_size > total_size)
+ io_size = total_size;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_START, upl_size, io_size, total_size, 0, 0);
+
+
+ /*
+ * Gather the pages from the buffer cache.
+ * The UPL_WILL_MODIFY flag lets the UPL subsystem know
+ * that we intend to modify these pages.
+ */
+ kret = ubc_create_upl(vp,
+ upl_f_offset,
+ upl_size,
+ &upl,
+ &pl,
+ UPL_SET_LITE | (( uio!=NULL && (uio->uio_flags & UIO_FLAGS_IS_COMPRESSED_FILE)) ? 0 : UPL_WILL_MODIFY));
+ if (kret != KERN_SUCCESS)
+ panic("cluster_write_copy: failed to get pagelist");
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_END,
+ upl, (int)upl_f_offset, start_offset, 0, 0);
+
+ if (start_offset && upl_f_offset < oldEOF && !upl_valid_page(pl, 0)) {
+ int read_size;
+
+ /*
+ * we're starting in the middle of the first page of the upl
+ * and the page isn't currently valid, so we're going to have
+ * to read it in first... this is a synchronous operation
+ */
+ read_size = PAGE_SIZE;
+
+ if ((upl_f_offset + read_size) > oldEOF)
+ read_size = oldEOF - upl_f_offset;
+
+ retval = cluster_io(vp, upl, 0, upl_f_offset, read_size,
+ CL_READ | bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg);
+ if (retval) {
+ /*
+ * we had an error during the read which causes us to abort
+ * the current cluster_write request... before we do, we need
+ * to release the rest of the pages in the upl without modifying
+ * there state and mark the failed page in error
+ */
+ ubc_upl_abort_range(upl, 0, PAGE_SIZE, UPL_ABORT_DUMP_PAGES|UPL_ABORT_FREE_ON_EMPTY);
+
+ if (upl_size > PAGE_SIZE)
+ ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE,
+ upl, 0, 0, retval, 0);
+ break;
+ }
+ }
+ if ((start_offset == 0 || upl_size > PAGE_SIZE) && ((start_offset + io_size) & PAGE_MASK)) {
+ /*
+ * the last offset we're writing to in this upl does not end on a page
+ * boundary... if it's not beyond the old EOF, then we'll also need to
+ * pre-read this page in if it isn't already valid
+ */
+ upl_offset = upl_size - PAGE_SIZE;
+
+ if ((upl_f_offset + start_offset + io_size) < oldEOF &&
+ !upl_valid_page(pl, upl_offset / PAGE_SIZE)) {
+ int read_size;
+
+ read_size = PAGE_SIZE;
+
+ if ((off_t)(upl_f_offset + upl_offset + read_size) > oldEOF)
+ read_size = oldEOF - (upl_f_offset + upl_offset);
+
+ retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, read_size,
+ CL_READ | bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg);
+ if (retval) {
+ /*
+ * we had an error during the read which causes us to abort
+ * the current cluster_write request... before we do, we
+ * need to release the rest of the pages in the upl without
+ * modifying there state and mark the failed page in error
+ */
+ ubc_upl_abort_range(upl, upl_offset, PAGE_SIZE, UPL_ABORT_DUMP_PAGES|UPL_ABORT_FREE_ON_EMPTY);
+
+ if (upl_size > PAGE_SIZE)
+ ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE,
+ upl, 0, 0, retval, 0);
+ break;
+ }
+ }
+ }
+ xfer_resid = io_size;
+ io_offset = start_offset;
+
+ while (zero_cnt && xfer_resid) {
+
+ if (zero_cnt < (long long)xfer_resid)
+ bytes_to_zero = zero_cnt;
+ else
+ bytes_to_zero = xfer_resid;
+
+ bytes_to_zero = cluster_zero_range(upl, pl, flags, io_offset, zero_off, upl_f_offset, bytes_to_zero);
+
+ xfer_resid -= bytes_to_zero;
+ zero_cnt -= bytes_to_zero;
+ zero_off += bytes_to_zero;
+ io_offset += bytes_to_zero;
+ }
+ if (xfer_resid && io_resid) {
+ u_int32_t io_requested;
+
+ bytes_to_move = min(io_resid, xfer_resid);
+ io_requested = bytes_to_move;
+
+ retval = cluster_copy_upl_data(uio, upl, io_offset, (int *)&io_requested);
+
+ if (retval) {
+ ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE,
+ upl, 0, 0, retval, 0);
+ } else {
+ io_resid -= bytes_to_move;
+ xfer_resid -= bytes_to_move;
+ io_offset += bytes_to_move;
+ }
+ }
+ while (xfer_resid && zero_cnt1 && retval == 0) {
+
+ if (zero_cnt1 < (long long)xfer_resid)
+ bytes_to_zero = zero_cnt1;
+ else
+ bytes_to_zero = xfer_resid;
+
+ bytes_to_zero = cluster_zero_range(upl, pl, flags, io_offset, zero_off1, upl_f_offset, bytes_to_zero);
+
+ xfer_resid -= bytes_to_zero;
+ zero_cnt1 -= bytes_to_zero;
+ zero_off1 += bytes_to_zero;
+ io_offset += bytes_to_zero;
+ }
+ if (retval == 0) {
+ int cl_index;
+ int ret_cluster_try_push;
+
+ io_size += start_offset;
+
+ if ((upl_f_offset + io_size) >= newEOF && (u_int)io_size < upl_size) {
+ /*
+ * if we're extending the file with this write
+ * we'll zero fill the rest of the page so that
+ * if the file gets extended again in such a way as to leave a
+ * hole starting at this EOF, we'll have zero's in the correct spot
+ */
+ cluster_zero(upl, io_size, upl_size - io_size, NULL);
+ }
+ /*
+ * release the upl now if we hold one since...
+ * 1) pages in it may be present in the sparse cluster map
+ * and may span 2 separate buckets there... if they do and
+ * we happen to have to flush a bucket to make room and it intersects
+ * this upl, a deadlock may result on page BUSY
+ * 2) we're delaying the I/O... from this point forward we're just updating
+ * the cluster state... no need to hold the pages, so commit them
+ * 3) IO_SYNC is set...
+ * because we had to ask for a UPL that provides currenty non-present pages, the
+ * UPL has been automatically set to clear the dirty flags (both software and hardware)
+ * upon committing it... this is not the behavior we want since it's possible for
+ * pages currently present as part of a mapped file to be dirtied while the I/O is in flight.
+ * we'll pick these pages back up later with the correct behavior specified.
+ * 4) we don't want to hold pages busy in a UPL and then block on the cluster lock... if a flush
+ * of this vnode is in progress, we will deadlock if the pages being flushed intersect the pages
+ * we hold since the flushing context is holding the cluster lock.
+ */
+ ubc_upl_commit_range(upl, 0, upl_size,
+ UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY);
+check_cluster:
+ /*
+ * calculate the last logical block number
+ * that this delayed I/O encompassed
+ */
+ cl.e_addr = (daddr64_t)((upl_f_offset + (off_t)upl_size) / PAGE_SIZE_64);
+
+ if (flags & IO_SYNC) {
+ /*
+ * if the IO_SYNC flag is set than we need to
+ * bypass any clusters and immediately issue
+ * the I/O
+ */
+ goto issue_io;
+ }
+ /*
+ * take the lock to protect our accesses
+ * of the writebehind and sparse cluster state
+ */
+ wbp = cluster_get_wbp(vp, CLW_ALLOCATE | CLW_RETURNLOCKED);
+
+ if (wbp->cl_scmap) {
+
+ if ( !(flags & IO_NOCACHE)) {
+ /*
+ * we've fallen into the sparse
+ * cluster method of delaying dirty pages
+ */
+ sparse_cluster_add(&(wbp->cl_scmap), vp, &cl, newEOF, callback, callback_arg);
+
+ lck_mtx_unlock(&wbp->cl_lockw);
+
+ continue;
+ }
+ /*
+ * must have done cached writes that fell into
+ * the sparse cluster mechanism... we've switched
+ * to uncached writes on the file, so go ahead
+ * and push whatever's in the sparse map
+ * and switch back to normal clustering
+ */
+ wbp->cl_number = 0;
+
+ sparse_cluster_push(&(wbp->cl_scmap), vp, newEOF, PUSH_ALL, 0, callback, callback_arg);
+ /*
+ * no clusters of either type present at this point
+ * so just go directly to start_new_cluster since
+ * we know we need to delay this I/O since we've
+ * already released the pages back into the cache
+ * to avoid the deadlock with sparse_cluster_push
+ */
+ goto start_new_cluster;
+ }
+ if (first_pass) {
+ if (write_off == wbp->cl_last_write)
+ wbp->cl_seq_written += write_cnt;
+ else
+ wbp->cl_seq_written = write_cnt;
+
+ wbp->cl_last_write = write_off + write_cnt;
+
+ first_pass = FALSE;
+ }
+ if (wbp->cl_number == 0)
+ /*
+ * no clusters currently present
+ */
+ goto start_new_cluster;
+
+ for (cl_index = 0; cl_index < wbp->cl_number; cl_index++) {
+ /*
+ * check each cluster that we currently hold
+ * try to merge some or all of this write into
+ * one or more of the existing clusters... if
+ * any portion of the write remains, start a
+ * new cluster
+ */
+ if (cl.b_addr >= wbp->cl_clusters[cl_index].b_addr) {
+ /*
+ * the current write starts at or after the current cluster
+ */
+ if (cl.e_addr <= (wbp->cl_clusters[cl_index].b_addr + max_cluster_pgcount)) {
+ /*
+ * we have a write that fits entirely
+ * within the existing cluster limits
+ */
+ if (cl.e_addr > wbp->cl_clusters[cl_index].e_addr)
+ /*
+ * update our idea of where the cluster ends
+ */
+ wbp->cl_clusters[cl_index].e_addr = cl.e_addr;
+ break;
+ }
+ if (cl.b_addr < (wbp->cl_clusters[cl_index].b_addr + max_cluster_pgcount)) {
+ /*
+ * we have a write that starts in the middle of the current cluster
+ * but extends beyond the cluster's limit... we know this because
+ * of the previous checks
+ * we'll extend the current cluster to the max
+ * and update the b_addr for the current write to reflect that
+ * the head of it was absorbed into this cluster...
+ * note that we'll always have a leftover tail in this case since
+ * full absorbtion would have occurred in the clause above
+ */
+ wbp->cl_clusters[cl_index].e_addr = wbp->cl_clusters[cl_index].b_addr + max_cluster_pgcount;
+
+ cl.b_addr = wbp->cl_clusters[cl_index].e_addr;
+ }
+ /*
+ * we come here for the case where the current write starts
+ * beyond the limit of the existing cluster or we have a leftover
+ * tail after a partial absorbtion
+ *
+ * in either case, we'll check the remaining clusters before
+ * starting a new one
+ */
+ } else {
+ /*
+ * the current write starts in front of the cluster we're currently considering
+ */
+ if ((wbp->cl_clusters[cl_index].e_addr - cl.b_addr) <= max_cluster_pgcount) {
+ /*
+ * we can just merge the new request into
+ * this cluster and leave it in the cache
+ * since the resulting cluster is still
+ * less than the maximum allowable size
+ */
+ wbp->cl_clusters[cl_index].b_addr = cl.b_addr;
+
+ if (cl.e_addr > wbp->cl_clusters[cl_index].e_addr) {
+ /*
+ * the current write completely
+ * envelops the existing cluster and since
+ * each write is limited to at most max_cluster_pgcount pages
+ * we can just use the start and last blocknos of the write
+ * to generate the cluster limits
+ */
+ wbp->cl_clusters[cl_index].e_addr = cl.e_addr;
+ }
+ break;
+ }
+
+ /*
+ * if we were to combine this write with the current cluster
+ * we would exceed the cluster size limit.... so,
+ * let's see if there's any overlap of the new I/O with
+ * the cluster we're currently considering... in fact, we'll
+ * stretch the cluster out to it's full limit and see if we
+ * get an intersection with the current write
+ *
+ */
+ if (cl.e_addr > wbp->cl_clusters[cl_index].e_addr - max_cluster_pgcount) {
+ /*
+ * the current write extends into the proposed cluster
+ * clip the length of the current write after first combining it's
+ * tail with the newly shaped cluster
+ */
+ wbp->cl_clusters[cl_index].b_addr = wbp->cl_clusters[cl_index].e_addr - max_cluster_pgcount;
+
+ cl.e_addr = wbp->cl_clusters[cl_index].b_addr;
+ }
+ /*
+ * if we get here, there was no way to merge
+ * any portion of this write with this cluster
+ * or we could only merge part of it which
+ * will leave a tail...
+ * we'll check the remaining clusters before starting a new one
+ */
+ }
+ }
+ if (cl_index < wbp->cl_number)
+ /*
+ * we found an existing cluster(s) that we
+ * could entirely merge this I/O into
+ */
+ goto delay_io;
+
+ if (!((unsigned int)vfs_flags(vp->v_mount) & MNT_DEFWRITE) &&
+ wbp->cl_number == MAX_CLUSTERS &&
+ wbp->cl_seq_written >= (MAX_CLUSTERS * (max_cluster_pgcount * PAGE_SIZE))) {
+ uint32_t n;
+
+ if (vp->v_mount->mnt_minsaturationbytecount) {
+ n = vp->v_mount->mnt_minsaturationbytecount / MAX_CLUSTER_SIZE(vp);
+
+ if (n > MAX_CLUSTERS)
+ n = MAX_CLUSTERS;
+ } else
+ n = 0;
+
+ if (n == 0) {
+ if (vp->v_mount->mnt_kern_flag & MNTK_SSD)
+ n = WRITE_BEHIND_SSD;
+ else
+ n = WRITE_BEHIND;
+ }
+ while (n--)
+ cluster_try_push(wbp, vp, newEOF, 0, 0, callback, callback_arg, NULL);
+ }
+ if (wbp->cl_number < MAX_CLUSTERS) {
+ /*
+ * we didn't find an existing cluster to
+ * merge into, but there's room to start
+ * a new one
+ */
+ goto start_new_cluster;
+ }
+ /*
+ * no exisitng cluster to merge with and no
+ * room to start a new one... we'll try
+ * pushing one of the existing ones... if none of
+ * them are able to be pushed, we'll switch
+ * to the sparse cluster mechanism
+ * cluster_try_push updates cl_number to the
+ * number of remaining clusters... and
+ * returns the number of currently unused clusters
+ */
+ ret_cluster_try_push = 0;
+
+ /*
+ * if writes are not deferred, call cluster push immediately
+ */
+ if (!((unsigned int)vfs_flags(vp->v_mount) & MNT_DEFWRITE)) {
+
+ ret_cluster_try_push = cluster_try_push(wbp, vp, newEOF, (flags & IO_NOCACHE) ? 0 : PUSH_DELAY, 0, callback, callback_arg, NULL);
+ }
+
+ /*
+ * execute following regardless of writes being deferred or not
+ */
+ if (ret_cluster_try_push == 0) {
+ /*
+ * no more room in the normal cluster mechanism
+ * so let's switch to the more expansive but expensive
+ * sparse mechanism....
+ */
+ sparse_cluster_switch(wbp, vp, newEOF, callback, callback_arg);
+ sparse_cluster_add(&(wbp->cl_scmap), vp, &cl, newEOF, callback, callback_arg);
+
+ lck_mtx_unlock(&wbp->cl_lockw);
+
+ continue;
+ }
+start_new_cluster:
+ wbp->cl_clusters[wbp->cl_number].b_addr = cl.b_addr;
+ wbp->cl_clusters[wbp->cl_number].e_addr = cl.e_addr;
+
+ wbp->cl_clusters[wbp->cl_number].io_flags = 0;
+
+ if (flags & IO_NOCACHE)
+ wbp->cl_clusters[wbp->cl_number].io_flags |= CLW_IONOCACHE;
+
+ if (bflag & CL_PASSIVE)
+ wbp->cl_clusters[wbp->cl_number].io_flags |= CLW_IOPASSIVE;
+
+ wbp->cl_number++;
+delay_io:
+ lck_mtx_unlock(&wbp->cl_lockw);
+
+ continue;
+issue_io:
+ /*
+ * we don't hold the lock at this point
+ *
+ * we've already dropped the current upl, so pick it back up with COPYOUT_FROM set
+ * so that we correctly deal with a change in state of the hardware modify bit...
+ * we do this via cluster_push_now... by passing along the IO_SYNC flag, we force
+ * cluster_push_now to wait until all the I/Os have completed... cluster_push_now is also
+ * responsible for generating the correct sized I/O(s)
+ */
+ retval = cluster_push_now(vp, &cl, newEOF, flags, callback, callback_arg);
+ }
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_END, retval, 0, io_resid, 0, 0);
+
+ return (retval);
+}
+
+
+
+int
+cluster_read(vnode_t vp, struct uio *uio, off_t filesize, int xflags)
+{
+ return cluster_read_ext(vp, uio, filesize, xflags, NULL, NULL);
+}
+
+
+int
+cluster_read_ext(vnode_t vp, struct uio *uio, off_t filesize, int xflags, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ int retval = 0;
+ int flags;
+ user_ssize_t cur_resid;
+ u_int32_t io_size;
+ u_int32_t read_length = 0;
+ int read_type = IO_COPY;
+
+ flags = xflags;
+
+ if (vp->v_flag & VNOCACHE_DATA)
+ flags |= IO_NOCACHE;
+ if ((vp->v_flag & VRAOFF) || speculative_reads_disabled)
+ flags |= IO_RAOFF;
+
+ if (flags & IO_SKIP_ENCRYPTION)
+ flags |= IO_ENCRYPTED;
+
+ /*
+ * do a read through the cache if one of the following is true....
+ * NOCACHE is not true
+ * the uio request doesn't target USERSPACE
+ * Alternatively, if IO_ENCRYPTED is set, then we want to bypass the cache as well.
+ * Reading encrypted data from a CP filesystem should never result in the data touching
+ * the UBC.
+ *
+ * otherwise, find out if we want the direct or contig variant for
+ * the first vector in the uio request
+ */
+ if ( ((flags & IO_NOCACHE) && UIO_SEG_IS_USER_SPACE(uio->uio_segflg)) || (flags & IO_ENCRYPTED) ) {
+
+ retval = cluster_io_type(uio, &read_type, &read_length, 0);
+ }
+
+ while ((cur_resid = uio_resid(uio)) && uio->uio_offset < filesize && retval == 0) {
+
+ switch (read_type) {
+
+ case IO_COPY:
+ /*
+ * make sure the uio_resid isn't too big...
+ * internally, we want to handle all of the I/O in
+ * chunk sizes that fit in a 32 bit int
+ */
+ if (cur_resid > (user_ssize_t)(MAX_IO_REQUEST_SIZE))
+ io_size = MAX_IO_REQUEST_SIZE;
+ else
+ io_size = (u_int32_t)cur_resid;
+
+ retval = cluster_read_copy(vp, uio, io_size, filesize, flags, callback, callback_arg);
+ break;
+
+ case IO_DIRECT:
+ retval = cluster_read_direct(vp, uio, filesize, &read_type, &read_length, flags, callback, callback_arg);
+ break;
+
+ case IO_CONTIG:
+ retval = cluster_read_contig(vp, uio, filesize, &read_type, &read_length, callback, callback_arg, flags);
+ break;
+
+ case IO_UNKNOWN:
+ retval = cluster_io_type(uio, &read_type, &read_length, 0);
+ break;
+ }
+ }
+ return (retval);
+}
+
+
+
+static void
+cluster_read_upl_release(upl_t upl, int start_pg, int last_pg, int take_reference)
+{
+ int range;
+ int abort_flags = UPL_ABORT_FREE_ON_EMPTY;
+
+ if ((range = last_pg - start_pg)) {
+ if (take_reference)
+ abort_flags |= UPL_ABORT_REFERENCE;
+
+ ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, range * PAGE_SIZE, abort_flags);
+ }
+}
+
+
+static int
+cluster_read_copy(vnode_t vp, struct uio *uio, u_int32_t io_req_size, off_t filesize, int flags, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ upl_page_info_t *pl;
+ upl_t upl;
+ vm_offset_t upl_offset;
+ u_int32_t upl_size;
+ off_t upl_f_offset;
+ int start_offset;
+ int start_pg;
+ int last_pg;
+ int uio_last = 0;
+ int pages_in_upl;
+ off_t max_size;
+ off_t last_ioread_offset;
+ off_t last_request_offset;
+ kern_return_t kret;
+ int error = 0;
+ int retval = 0;
+ u_int32_t size_of_prefetch;
+ u_int32_t xsize;
+ u_int32_t io_size;
+ u_int32_t max_rd_size;
+ u_int32_t max_io_size;
+ u_int32_t max_prefetch;
+ u_int rd_ahead_enabled = 1;
+ u_int prefetch_enabled = 1;
+ struct cl_readahead * rap;
+ struct clios iostate;
+ struct cl_extent extent;
+ int bflag;
+ int take_reference = 1;
+ int policy = IOPOL_DEFAULT;
+ boolean_t iolock_inited = FALSE;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_START,
+ (int)uio->uio_offset, io_req_size, (int)filesize, flags, 0);
+
+ if (flags & IO_ENCRYPTED) {
+ panic ("encrypted blocks will hit UBC!");
+ }
+
+ policy = throttle_get_io_policy(NULL);
+
+ if (policy == THROTTLE_LEVEL_TIER3 || policy == THROTTLE_LEVEL_TIER2 || (flags & IO_NOCACHE))
+ take_reference = 0;
+
+ if (flags & IO_PASSIVE)
+ bflag = CL_PASSIVE;
+ else
+ bflag = 0;
+
+ if (flags & IO_NOCACHE)
+ bflag |= CL_NOCACHE;
+
+ if (flags & IO_SKIP_ENCRYPTION)
+ bflag |= CL_ENCRYPTED;
+
+ max_io_size = cluster_max_io_size(vp->v_mount, CL_READ);
+ max_prefetch = MAX_PREFETCH(vp, max_io_size, (vp->v_mount->mnt_kern_flag & MNTK_SSD));
+ max_rd_size = max_prefetch;
+
+ last_request_offset = uio->uio_offset + io_req_size;
+
+ if (last_request_offset > filesize)
+ last_request_offset = filesize;
+
+ if ((flags & (IO_RAOFF|IO_NOCACHE)) || ((last_request_offset & ~PAGE_MASK_64) == (uio->uio_offset & ~PAGE_MASK_64))) {
+ rd_ahead_enabled = 0;
+ rap = NULL;
+ } else {
+ if (cluster_is_throttled(vp)) {
+ /*
+ * we're in the throttle window, at the very least
+ * we want to limit the size of the I/O we're about
+ * to issue
+ */
+ rd_ahead_enabled = 0;
+ prefetch_enabled = 0;
+
+ max_rd_size = THROTTLE_MAX_IOSIZE;
+ }
+ if ((rap = cluster_get_rap(vp)) == NULL)
+ rd_ahead_enabled = 0;
+ else {
+ extent.b_addr = uio->uio_offset / PAGE_SIZE_64;
+ extent.e_addr = (last_request_offset - 1) / PAGE_SIZE_64;
+ }
+ }
+ if (rap != NULL && rap->cl_ralen && (rap->cl_lastr == extent.b_addr || (rap->cl_lastr + 1) == extent.b_addr)) {
+ /*
+ * determine if we already have a read-ahead in the pipe courtesy of the
+ * last read systemcall that was issued...
+ * if so, pick up it's extent to determine where we should start
+ * with respect to any read-ahead that might be necessary to
+ * garner all the data needed to complete this read systemcall
+ */
+ last_ioread_offset = (rap->cl_maxra * PAGE_SIZE_64) + PAGE_SIZE_64;
+
+ if (last_ioread_offset < uio->uio_offset)
+ last_ioread_offset = (off_t)0;
+ else if (last_ioread_offset > last_request_offset)
+ last_ioread_offset = last_request_offset;
+ } else
+ last_ioread_offset = (off_t)0;
+
+ while (io_req_size && uio->uio_offset < filesize && retval == 0) {
+
+ max_size = filesize - uio->uio_offset;
+
+ if ((off_t)(io_req_size) < max_size)
+ io_size = io_req_size;
+ else
+ io_size = max_size;
+
+ if (!(flags & IO_NOCACHE)) {
+
+ while (io_size) {
+ u_int32_t io_resid;
+ u_int32_t io_requested;
+
+ /*
+ * if we keep finding the pages we need already in the cache, then
+ * don't bother to call cluster_read_prefetch since it costs CPU cycles
+ * to determine that we have all the pages we need... once we miss in
+ * the cache and have issued an I/O, than we'll assume that we're likely
+ * to continue to miss in the cache and it's to our advantage to try and prefetch
+ */
+ if (last_request_offset && last_ioread_offset && (size_of_prefetch = (last_request_offset - last_ioread_offset))) {
+ if ((last_ioread_offset - uio->uio_offset) <= max_rd_size && prefetch_enabled) {
+ /*
+ * we've already issued I/O for this request and
+ * there's still work to do and
+ * our prefetch stream is running dry, so issue a
+ * pre-fetch I/O... the I/O latency will overlap
+ * with the copying of the data
+ */
+ if (size_of_prefetch > max_rd_size)
+ size_of_prefetch = max_rd_size;
+
+ size_of_prefetch = cluster_read_prefetch(vp, last_ioread_offset, size_of_prefetch, filesize, callback, callback_arg, bflag);
+
+ last_ioread_offset += (off_t)(size_of_prefetch * PAGE_SIZE);
+
+ if (last_ioread_offset > last_request_offset)
+ last_ioread_offset = last_request_offset;
+ }
+ }
+ /*
+ * limit the size of the copy we're about to do so that
+ * we can notice that our I/O pipe is running dry and
+ * get the next I/O issued before it does go dry
+ */
+ if (last_ioread_offset && io_size > (max_io_size / 4))
+ io_resid = (max_io_size / 4);
+ else
+ io_resid = io_size;
+
+ io_requested = io_resid;
+
+ retval = cluster_copy_ubc_data_internal(vp, uio, (int *)&io_resid, 0, take_reference);
+
+ xsize = io_requested - io_resid;
+
+ io_size -= xsize;
+ io_req_size -= xsize;
+
+ if (retval || io_resid)
+ /*
+ * if we run into a real error or
+ * a page that is not in the cache
+ * we need to leave streaming mode
+ */
+ break;
+
+ if (rd_ahead_enabled && (io_size == 0 || last_ioread_offset == last_request_offset)) {
+ /*
+ * we're already finished the I/O for this read request
+ * let's see if we should do a read-ahead
+ */
+ cluster_read_ahead(vp, &extent, filesize, rap, callback, callback_arg, bflag);
+ }
+ }
+ if (retval)
+ break;
+ if (io_size == 0) {
+ if (rap != NULL) {
+ if (extent.e_addr < rap->cl_lastr)
+ rap->cl_maxra = 0;
+ rap->cl_lastr = extent.e_addr;
+ }
+ break;
+ }
+ /*
+ * recompute max_size since cluster_copy_ubc_data_internal
+ * may have advanced uio->uio_offset
+ */
+ max_size = filesize - uio->uio_offset;
+ }
+
+ iostate.io_completed = 0;
+ iostate.io_issued = 0;
+ iostate.io_error = 0;
+ iostate.io_wanted = 0;
+
+ if ( (flags & IO_RETURN_ON_THROTTLE) ) {
+ if (cluster_is_throttled(vp) == THROTTLE_NOW) {
+ if ( !cluster_io_present_in_BC(vp, uio->uio_offset)) {
+ /*
+ * we're in the throttle window and at least 1 I/O
+ * has already been issued by a throttleable thread
+ * in this window, so return with EAGAIN to indicate
+ * to the FS issuing the cluster_read call that it
+ * should now throttle after dropping any locks
+ */
+ throttle_info_update_by_mount(vp->v_mount);
+
+ retval = EAGAIN;
+ break;
+ }
+ }
+ }
+
+ /*
+ * compute the size of the upl needed to encompass
+ * the requested read... limit each call to cluster_io
+ * to the maximum UPL size... cluster_io will clip if
+ * this exceeds the maximum io_size for the device,
+ * make sure to account for
+ * a starting offset that's not page aligned
+ */
+ start_offset = (int)(uio->uio_offset & PAGE_MASK_64);
+ upl_f_offset = uio->uio_offset - (off_t)start_offset;
+
+ if (io_size > max_rd_size)
+ io_size = max_rd_size;
+
+ upl_size = (start_offset + io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
+
+ if (flags & IO_NOCACHE) {
+ if (upl_size > max_io_size)
+ upl_size = max_io_size;
+ } else {
+ if (upl_size > max_io_size / 4) {
+ upl_size = max_io_size / 4;
+ upl_size &= ~PAGE_MASK;
+
+ if (upl_size == 0)
+ upl_size = PAGE_SIZE;
+ }
+ }
+ pages_in_upl = upl_size / PAGE_SIZE;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 33)) | DBG_FUNC_START,
+ upl, (int)upl_f_offset, upl_size, start_offset, 0);
+
+ kret = ubc_create_upl(vp,
+ upl_f_offset,
+ upl_size,
+ &upl,
+ &pl,
+ UPL_FILE_IO | UPL_SET_LITE);
+ if (kret != KERN_SUCCESS)
+ panic("cluster_read_copy: failed to get pagelist");
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 33)) | DBG_FUNC_END,
+ upl, (int)upl_f_offset, upl_size, start_offset, 0);
+
+ /*
+ * scan from the beginning of the upl looking for the first
+ * non-valid page.... this will become the first page in
+ * the request we're going to make to 'cluster_io'... if all
+ * of the pages are valid, we won't call through to 'cluster_io'
+ */
+ for (start_pg = 0; start_pg < pages_in_upl; start_pg++) {
+ if (!upl_valid_page(pl, start_pg))
+ break;
+ }
+
+ /*
+ * scan from the starting invalid page looking for a valid
+ * page before the end of the upl is reached, if we
+ * find one, then it will be the last page of the request to
+ * 'cluster_io'
+ */
+ for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) {
+ if (upl_valid_page(pl, last_pg))
+ break;
+ }
+
+ if (start_pg < last_pg) {
+ /*
+ * we found a range of 'invalid' pages that must be filled
+ * if the last page in this range is the last page of the file
+ * we may have to clip the size of it to keep from reading past
+ * the end of the last physical block associated with the file
+ */
+ if (iolock_inited == FALSE) {
+ lck_mtx_init(&iostate.io_mtxp, cl_mtx_grp, cl_mtx_attr);
+
+ iolock_inited = TRUE;
+ }
+ upl_offset = start_pg * PAGE_SIZE;
+ io_size = (last_pg - start_pg) * PAGE_SIZE;
+
+ if ((off_t)(upl_f_offset + upl_offset + io_size) > filesize)
+ io_size = filesize - (upl_f_offset + upl_offset);
+
+ /*
+ * issue an asynchronous read to cluster_io
+ */
+
+ error = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset,
+ io_size, CL_READ | CL_ASYNC | bflag, (buf_t)NULL, &iostate, callback, callback_arg);
+
+ if (rap) {
+ if (extent.e_addr < rap->cl_maxra) {
+ /*
+ * we've just issued a read for a block that should have been
+ * in the cache courtesy of the read-ahead engine... something
+ * has gone wrong with the pipeline, so reset the read-ahead
+ * logic which will cause us to restart from scratch
+ */
+ rap->cl_maxra = 0;
+ }
+ }
+ }
+ if (error == 0) {
+ /*
+ * if the read completed successfully, or there was no I/O request
+ * issued, than copy the data into user land via 'cluster_upl_copy_data'
+ * we'll first add on any 'valid'
+ * pages that were present in the upl when we acquired it.
+ */
+ u_int val_size;
+
+ for (uio_last = last_pg; uio_last < pages_in_upl; uio_last++) {
+ if (!upl_valid_page(pl, uio_last))
+ break;
+ }
+ if (uio_last < pages_in_upl) {
+ /*
+ * there were some invalid pages beyond the valid pages
+ * that we didn't issue an I/O for, just release them
+ * unchanged now, so that any prefetch/readahed can
+ * include them
+ */
+ ubc_upl_abort_range(upl, uio_last * PAGE_SIZE,
+ (pages_in_upl - uio_last) * PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY);
+ }
+
+ /*
+ * compute size to transfer this round, if io_req_size is
+ * still non-zero after this attempt, we'll loop around and
+ * set up for another I/O.
+ */
+ val_size = (uio_last * PAGE_SIZE) - start_offset;
+
+ if (val_size > max_size)
+ val_size = max_size;
+
+ if (val_size > io_req_size)
+ val_size = io_req_size;
+
+ if ((uio->uio_offset + val_size) > last_ioread_offset)
+ last_ioread_offset = uio->uio_offset + val_size;
+
+ if ((size_of_prefetch = (last_request_offset - last_ioread_offset)) && prefetch_enabled) {
+
+ if ((last_ioread_offset - (uio->uio_offset + val_size)) <= upl_size) {
+ /*
+ * if there's still I/O left to do for this request, and...
+ * we're not in hard throttle mode, and...
+ * we're close to using up the previous prefetch, then issue a
+ * new pre-fetch I/O... the I/O latency will overlap
+ * with the copying of the data
+ */
+ if (size_of_prefetch > max_rd_size)
+ size_of_prefetch = max_rd_size;
+
+ size_of_prefetch = cluster_read_prefetch(vp, last_ioread_offset, size_of_prefetch, filesize, callback, callback_arg, bflag);
+
+ last_ioread_offset += (off_t)(size_of_prefetch * PAGE_SIZE);
+
+ if (last_ioread_offset > last_request_offset)
+ last_ioread_offset = last_request_offset;
+ }
+
+ } else if ((uio->uio_offset + val_size) == last_request_offset) {
+ /*
+ * this transfer will finish this request, so...
+ * let's try to read ahead if we're in
+ * a sequential access pattern and we haven't
+ * explicitly disabled it
+ */
+ if (rd_ahead_enabled)
+ cluster_read_ahead(vp, &extent, filesize, rap, callback, callback_arg, bflag);
+
+ if (rap != NULL) {
+ if (extent.e_addr < rap->cl_lastr)
+ rap->cl_maxra = 0;
+ rap->cl_lastr = extent.e_addr;
+ }
+ }
+ if (iolock_inited == TRUE)
+ cluster_iostate_wait(&iostate, 0, "cluster_read_copy");
+
+ if (iostate.io_error)
+ error = iostate.io_error;
+ else {
+ u_int32_t io_requested;
+
+ io_requested = val_size;
+
+ retval = cluster_copy_upl_data(uio, upl, start_offset, (int *)&io_requested);
+
+ io_req_size -= (val_size - io_requested);
+ }
+ } else {
+ if (iolock_inited == TRUE)
+ cluster_iostate_wait(&iostate, 0, "cluster_read_copy");
+ }
+ if (start_pg < last_pg) {
+ /*
+ * compute the range of pages that we actually issued an I/O for
+ * and either commit them as valid if the I/O succeeded
+ * or abort them if the I/O failed or we're not supposed to
+ * keep them in the cache
+ */
+ io_size = (last_pg - start_pg) * PAGE_SIZE;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_START, upl, start_pg * PAGE_SIZE, io_size, error, 0);
+
+ if (error || (flags & IO_NOCACHE))
+ ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, io_size,
+ UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY);
+ else {
+ int commit_flags = UPL_COMMIT_CLEAR_DIRTY | UPL_COMMIT_FREE_ON_EMPTY;
+
+ if (take_reference)
+ commit_flags |= UPL_COMMIT_INACTIVATE;
+ else
+ commit_flags |= UPL_COMMIT_SPECULATE;
+
+ ubc_upl_commit_range(upl, start_pg * PAGE_SIZE, io_size, commit_flags);
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END, upl, start_pg * PAGE_SIZE, io_size, error, 0);
+ }
+ if ((last_pg - start_pg) < pages_in_upl) {
+ /*
+ * the set of pages that we issued an I/O for did not encompass
+ * the entire upl... so just release these without modifying
+ * their state
+ */
+ if (error)
+ ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
+ else {
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_START,
+ upl, -1, pages_in_upl - (last_pg - start_pg), 0, 0);
+
+ /*
+ * handle any valid pages at the beginning of
+ * the upl... release these appropriately
+ */
+ cluster_read_upl_release(upl, 0, start_pg, take_reference);
+
+ /*
+ * handle any valid pages immediately after the
+ * pages we issued I/O for... ... release these appropriately
+ */
+ cluster_read_upl_release(upl, last_pg, uio_last, take_reference);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END, upl, -1, -1, 0, 0);
+ }
+ }
+ if (retval == 0)
+ retval = error;
+
+ if (io_req_size) {
+ if (cluster_is_throttled(vp)) {
+ /*
+ * we're in the throttle window, at the very least
+ * we want to limit the size of the I/O we're about
+ * to issue
+ */
+ rd_ahead_enabled = 0;
+ prefetch_enabled = 0;
+ max_rd_size = THROTTLE_MAX_IOSIZE;
+ } else {
+ if (max_rd_size == THROTTLE_MAX_IOSIZE) {
+ /*
+ * coming out of throttled state
+ */
+ if (policy != THROTTLE_LEVEL_TIER3 && policy != THROTTLE_LEVEL_TIER2) {
+ if (rap != NULL)
+ rd_ahead_enabled = 1;
+ prefetch_enabled = 1;
+ }
+ max_rd_size = max_prefetch;
+ last_ioread_offset = 0;
+ }
+ }
+ }
+ }
+ if (iolock_inited == TRUE) {
+ /*
+ * cluster_io returned an error after it
+ * had already issued some I/O. we need
+ * to wait for that I/O to complete before
+ * we can destroy the iostate mutex...
+ * 'retval' already contains the early error
+ * so no need to pick it up from iostate.io_error
+ */
+ cluster_iostate_wait(&iostate, 0, "cluster_read_copy");
+
+ lck_mtx_destroy(&iostate.io_mtxp, cl_mtx_grp);
+ }
+ if (rap != NULL) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_END,
+ (int)uio->uio_offset, io_req_size, rap->cl_lastr, retval, 0);
+
+ lck_mtx_unlock(&rap->cl_lockr);
+ } else {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_END,
+ (int)uio->uio_offset, io_req_size, 0, retval, 0);
+ }
+
+ return (retval);
+}
+
+/*
+ * We don't want another read/write lock for every vnode in the system
+ * so we keep a hash of them here. There should never be very many of
+ * these around at any point in time.
+ */
+cl_direct_read_lock_t *cluster_lock_direct_read(vnode_t vp, lck_rw_type_t type)
+{
+ struct cl_direct_read_locks *head
+ = &cl_direct_read_locks[(uintptr_t)vp / sizeof(*vp)
+ % CL_DIRECT_READ_LOCK_BUCKETS];
+
+ struct cl_direct_read_lock *lck, *new_lck = NULL;
+
+ for (;;) {
+ lck_spin_lock(&cl_direct_read_spin_lock);
+
+ LIST_FOREACH(lck, head, chain) {
+ if (lck->vp == vp) {
+ ++lck->ref_count;
+ lck_spin_unlock(&cl_direct_read_spin_lock);
+ if (new_lck) {
+ // Someone beat us to it, ditch the allocation
+ lck_rw_destroy(&new_lck->rw_lock, cl_mtx_grp);
+ FREE(new_lck, M_TEMP);
+ }
+ lck_rw_lock(&lck->rw_lock, type);
+ return lck;
+ }
+ }
+
+ if (new_lck) {
+ // Use the lock we allocated
+ LIST_INSERT_HEAD(head, new_lck, chain);
+ lck_spin_unlock(&cl_direct_read_spin_lock);
+ lck_rw_lock(&new_lck->rw_lock, type);
+ return new_lck;
+ }
+
+ lck_spin_unlock(&cl_direct_read_spin_lock);
+
+ // Allocate a new lock
+ MALLOC(new_lck, cl_direct_read_lock_t *, sizeof(*new_lck),
+ M_TEMP, M_WAITOK);
+ lck_rw_init(&new_lck->rw_lock, cl_mtx_grp, cl_mtx_attr);
+ new_lck->vp = vp;
+ new_lck->ref_count = 1;
+
+ // Got to go round again
+ }
+}
+
+void cluster_unlock_direct_read(cl_direct_read_lock_t *lck)
+{
+ lck_rw_done(&lck->rw_lock);
+
+ lck_spin_lock(&cl_direct_read_spin_lock);
+ if (lck->ref_count == 1) {
+ LIST_REMOVE(lck, chain);
+ lck_spin_unlock(&cl_direct_read_spin_lock);
+ lck_rw_destroy(&lck->rw_lock, cl_mtx_grp);
+ FREE(lck, M_TEMP);
+ } else {
+ --lck->ref_count;
+ lck_spin_unlock(&cl_direct_read_spin_lock);
+ }
+}
+
+static int
+cluster_read_direct(vnode_t vp, struct uio *uio, off_t filesize, int *read_type, u_int32_t *read_length,
+ int flags, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ upl_t upl;
+ upl_page_info_t *pl;
+ off_t max_io_size;
+ vm_offset_t upl_offset, vector_upl_offset = 0;
+ upl_size_t upl_size, vector_upl_size = 0;
+ vm_size_t upl_needed_size;
+ unsigned int pages_in_pl;
+ upl_control_flags_t upl_flags;
+ kern_return_t kret;
+ unsigned int i;
+ int force_data_sync;
+ int retval = 0;
+ int no_zero_fill = 0;
+ int io_flag = 0;
+ int misaligned = 0;
+ struct clios iostate;
+ user_addr_t iov_base;
+ u_int32_t io_req_size;
+ u_int32_t offset_in_file;
+ u_int32_t offset_in_iovbase;
+ u_int32_t io_size;
+ u_int32_t io_min;
+ u_int32_t xsize;
+ u_int32_t devblocksize;
+ u_int32_t mem_alignment_mask;
+ u_int32_t max_upl_size;
+ u_int32_t max_rd_size;
+ u_int32_t max_rd_ahead;
+ u_int32_t max_vector_size;
+ boolean_t strict_uncached_IO = FALSE;
+ boolean_t io_throttled = FALSE;
+
+ u_int32_t vector_upl_iosize = 0;
+ int issueVectorUPL = 0,useVectorUPL = (uio->uio_iovcnt > 1);
+ off_t v_upl_uio_offset = 0;
+ int vector_upl_index=0;
+ upl_t vector_upl = NULL;
+ cl_direct_read_lock_t *lock = NULL;
+
+ user_addr_t orig_iov_base = 0;
+ user_addr_t last_iov_base = 0;
+ user_addr_t next_iov_base = 0;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_START,
+ (int)uio->uio_offset, (int)filesize, *read_type, *read_length, 0);
+
+ max_upl_size = cluster_max_io_size(vp->v_mount, CL_READ);
+
+ max_rd_size = max_upl_size;
+ max_rd_ahead = max_rd_size * IO_SCALE(vp, 2);
+
+ io_flag = CL_COMMIT | CL_READ | CL_ASYNC | CL_NOZERO | CL_DIRECT_IO;
+
+ if (flags & IO_PASSIVE)
+ io_flag |= CL_PASSIVE;
+
+ if (flags & IO_ENCRYPTED) {
+ io_flag |= CL_RAW_ENCRYPTED;
+ }
+
+ if (flags & IO_NOCACHE) {
+ io_flag |= CL_NOCACHE;
+ }
+
+ if (flags & IO_SKIP_ENCRYPTION)
+ io_flag |= CL_ENCRYPTED;
+
+ iostate.io_completed = 0;
+ iostate.io_issued = 0;
+ iostate.io_error = 0;
+ iostate.io_wanted = 0;
+
+ lck_mtx_init(&iostate.io_mtxp, cl_mtx_grp, cl_mtx_attr);
+
+ devblocksize = (u_int32_t)vp->v_mount->mnt_devblocksize;
+ mem_alignment_mask = (u_int32_t)vp->v_mount->mnt_alignmentmask;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_NONE,
+ (int)devblocksize, (int)mem_alignment_mask, 0, 0, 0);
+
+ if (devblocksize == 1) {
+ /*
+ * the AFP client advertises a devblocksize of 1
+ * however, its BLOCKMAP routine maps to physical
+ * blocks that are PAGE_SIZE in size...
+ * therefore we can't ask for I/Os that aren't page aligned
+ * or aren't multiples of PAGE_SIZE in size
+ * by setting devblocksize to PAGE_SIZE, we re-instate
+ * the old behavior we had before the mem_alignment_mask
+ * changes went in...
+ */
+ devblocksize = PAGE_SIZE;
+ }
+
+ strict_uncached_IO = ubc_strict_uncached_IO(vp);
+
+ orig_iov_base = uio_curriovbase(uio);
+ last_iov_base = orig_iov_base;
+
+next_dread:
+ io_req_size = *read_length;
+ iov_base = uio_curriovbase(uio);
+
+ offset_in_file = (u_int32_t)uio->uio_offset & (devblocksize - 1);
+ offset_in_iovbase = (u_int32_t)iov_base & mem_alignment_mask;
+
+ if (offset_in_file || offset_in_iovbase) {
+ /*
+ * one of the 2 important offsets is misaligned
+ * so fire an I/O through the cache for this entire vector
+ */
+ misaligned = 1;
+ }
+ if (iov_base & (devblocksize - 1)) {
+ /*
+ * the offset in memory must be on a device block boundary
+ * so that we can guarantee that we can generate an
+ * I/O that ends on a page boundary in cluster_io
+ */
+ misaligned = 1;
+ }
+
+ max_io_size = filesize - uio->uio_offset;
+
+ /*
+ * The user must request IO in aligned chunks. If the
+ * offset into the file is bad, or the userland pointer
+ * is non-aligned, then we cannot service the encrypted IO request.
+ */
+ if (flags & IO_ENCRYPTED) {
+ if (misaligned || (io_req_size & (devblocksize - 1)))
+ retval = EINVAL;
+
+ max_io_size = roundup(max_io_size, devblocksize);
+ }
+
+ if ((off_t)io_req_size > max_io_size)
+ io_req_size = max_io_size;
+
+ /*
+ * When we get to this point, we know...
+ * -- the offset into the file is on a devblocksize boundary
+ */
+
+ while (io_req_size && retval == 0) {
+ u_int32_t io_start;
+
+ if (cluster_is_throttled(vp)) {
+ /*
+ * we're in the throttle window, at the very least
+ * we want to limit the size of the I/O we're about
+ * to issue
+ */
+ max_rd_size = THROTTLE_MAX_IOSIZE;
+ max_rd_ahead = THROTTLE_MAX_IOSIZE - 1;
+ max_vector_size = THROTTLE_MAX_IOSIZE;
+ } else {
+ max_rd_size = max_upl_size;
+ max_rd_ahead = max_rd_size * IO_SCALE(vp, 2);
+ max_vector_size = MAX_VECTOR_UPL_SIZE;
+ }
+ io_start = io_size = io_req_size;
+
+ /*
+ * First look for pages already in the cache
+ * and move them to user space. But only do this
+ * check if we are not retrieving encrypted data directly
+ * from the filesystem; those blocks should never
+ * be in the UBC.
+ *
+ * cluster_copy_ubc_data returns the resid
+ * in io_size
+ */
+ if ((strict_uncached_IO == FALSE) && ((flags & IO_ENCRYPTED) == 0)) {
+ retval = cluster_copy_ubc_data_internal(vp, uio, (int *)&io_size, 0, 0);
+ }
+ /*
+ * calculate the number of bytes actually copied
+ * starting size - residual
+ */
+ xsize = io_start - io_size;
+
+ io_req_size -= xsize;
+
+ if(useVectorUPL && (xsize || (iov_base & PAGE_MASK))) {
+ /*
+ * We found something in the cache or we have an iov_base that's not
+ * page-aligned.
+ *
+ * Issue all I/O's that have been collected within this Vectored UPL.
+ */
+ if(vector_upl_index) {
+ retval = vector_cluster_io(vp, vector_upl, vector_upl_offset, v_upl_uio_offset, vector_upl_iosize, io_flag, (buf_t)NULL, &iostate, callback, callback_arg);
+ reset_vector_run_state();
+ }
+
+ if(xsize)
+ useVectorUPL = 0;
+
+ /*
+ * After this point, if we are using the Vector UPL path and the base is
+ * not page-aligned then the UPL with that base will be the first in the vector UPL.
+ */
+ }
+
+ /*
+ * check to see if we are finished with this request.
+ *
+ * If we satisfied this IO already, then io_req_size will be 0.
+ * Otherwise, see if the IO was mis-aligned and needs to go through
+ * the UBC to deal with the 'tail'.
+ *
+ */
+ if (io_req_size == 0 || (misaligned)) {
+ /*
+ * see if there's another uio vector to
+ * process that's of type IO_DIRECT
+ *
+ * break out of while loop to get there
+ */
+ break;
+ }
+ /*
+ * assume the request ends on a device block boundary
+ */
+ io_min = devblocksize;
+
+ /*
+ * we can handle I/O's in multiples of the device block size
+ * however, if io_size isn't a multiple of devblocksize we
+ * want to clip it back to the nearest page boundary since
+ * we are going to have to go through cluster_read_copy to
+ * deal with the 'overhang'... by clipping it to a PAGE_SIZE
+ * multiple, we avoid asking the drive for the same physical
+ * blocks twice.. once for the partial page at the end of the
+ * request and a 2nd time for the page we read into the cache
+ * (which overlaps the end of the direct read) in order to
+ * get at the overhang bytes
+ */
+ if (io_size & (devblocksize - 1)) {
+ assert(!(flags & IO_ENCRYPTED));
+ /*
+ * Clip the request to the previous page size boundary
+ * since request does NOT end on a device block boundary
+ */
+ io_size &= ~PAGE_MASK;
+ io_min = PAGE_SIZE;
+ }
+ if (retval || io_size < io_min) {
+ /*
+ * either an error or we only have the tail left to
+ * complete via the copy path...
+ * we may have already spun some portion of this request
+ * off as async requests... we need to wait for the I/O
+ * to complete before returning
+ */
+ goto wait_for_dreads;
+ }
+
+ /*
+ * Don't re-check the UBC data if we are looking for uncached IO
+ * or asking for encrypted blocks.
+ */
+ if ((strict_uncached_IO == FALSE) && ((flags & IO_ENCRYPTED) == 0)) {
+
+ if ((xsize = io_size) > max_rd_size)
+ xsize = max_rd_size;
+
+ io_size = 0;
+
+ if (!lock) {
+ /*
+ * We hold a lock here between the time we check the
+ * cache and the time we issue I/O. This saves us
+ * from having to lock the pages in the cache. Not
+ * all clients will care about this lock but some
+ * clients may want to guarantee stability between
+ * here and when the I/O is issued in which case they
+ * will take the lock exclusively.
+ */
+ lock = cluster_lock_direct_read(vp, LCK_RW_TYPE_SHARED);
+ }
+
+ ubc_range_op(vp, uio->uio_offset, uio->uio_offset + xsize, UPL_ROP_ABSENT, (int *)&io_size);
+
+ if (io_size == 0) {
+ /*
+ * a page must have just come into the cache
+ * since the first page in this range is no
+ * longer absent, go back and re-evaluate
+ */
+ continue;
+ }
+ }
+ if ( (flags & IO_RETURN_ON_THROTTLE) ) {
+ if (cluster_is_throttled(vp) == THROTTLE_NOW) {
+ if ( !cluster_io_present_in_BC(vp, uio->uio_offset)) {
+ /*
+ * we're in the throttle window and at least 1 I/O
+ * has already been issued by a throttleable thread
+ * in this window, so return with EAGAIN to indicate
+ * to the FS issuing the cluster_read call that it
+ * should now throttle after dropping any locks
+ */
+ throttle_info_update_by_mount(vp->v_mount);
+
+ io_throttled = TRUE;
+ goto wait_for_dreads;
+ }
+ }
+ }
+ if (io_size > max_rd_size)
+ io_size = max_rd_size;
+
+ iov_base = uio_curriovbase(uio);
+
+ upl_offset = (vm_offset_t)((u_int32_t)iov_base & PAGE_MASK);
+ upl_needed_size = (upl_offset + io_size + (PAGE_SIZE -1)) & ~PAGE_MASK;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_START,
+ (int)upl_offset, upl_needed_size, (int)iov_base, io_size, 0);
+
+ if (upl_offset == 0 && ((io_size & PAGE_MASK) == 0))
+ no_zero_fill = 1;
+ else
+ no_zero_fill = 0;
+
+ vm_map_t map = UIO_SEG_IS_USER_SPACE(uio->uio_segflg) ? current_map() : kernel_map;
+ for (force_data_sync = 0; force_data_sync < 3; force_data_sync++) {
+ pages_in_pl = 0;
+ upl_size = upl_needed_size;
+ upl_flags = UPL_FILE_IO | UPL_NO_SYNC | UPL_SET_INTERNAL | UPL_SET_LITE | UPL_SET_IO_WIRE
+ | UPL_MEMORY_TAG_MAKE(VM_KERN_MEMORY_FILE);
+ if (no_zero_fill)
+ upl_flags |= UPL_NOZEROFILL;
+ if (force_data_sync)
+ upl_flags |= UPL_FORCE_DATA_SYNC;
+
+ kret = vm_map_create_upl(map,
+ (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)),
+ &upl_size, &upl, NULL, &pages_in_pl, &upl_flags);
+
+ if (kret != KERN_SUCCESS) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END,
+ (int)upl_offset, upl_size, io_size, kret, 0);
+ /*
+ * failed to get pagelist
+ *
+ * we may have already spun some portion of this request
+ * off as async requests... we need to wait for the I/O
+ * to complete before returning
+ */
+ goto wait_for_dreads;
+ }
+ pages_in_pl = upl_size / PAGE_SIZE;
+ pl = UPL_GET_INTERNAL_PAGE_LIST(upl);
+
+ for (i = 0; i < pages_in_pl; i++) {
+ if (!upl_page_present(pl, i))
+ break;
+ }
+ if (i == pages_in_pl)
+ break;
+
+ ubc_upl_abort(upl, 0);
+ }
+ if (force_data_sync >= 3) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END,
+ (int)upl_offset, upl_size, io_size, kret, 0);
+
+ goto wait_for_dreads;
+ }
+ /*
+ * Consider the possibility that upl_size wasn't satisfied.
+ */
+ if (upl_size < upl_needed_size) {
+ if (upl_size && upl_offset == 0)
+ io_size = upl_size;
+ else
+ io_size = 0;
+ }
+ if (io_size == 0) {
+ ubc_upl_abort(upl, 0);
+ goto wait_for_dreads;
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END,
+ (int)upl_offset, upl_size, io_size, kret, 0);
+
+ if(useVectorUPL) {
+ vm_offset_t end_off = ((iov_base + io_size) & PAGE_MASK);
+ if(end_off)
+ issueVectorUPL = 1;
+ /*
+ * After this point, if we are using a vector UPL, then
+ * either all the UPL elements end on a page boundary OR
+ * this UPL is the last element because it does not end
+ * on a page boundary.
+ */
+ }
+
+ /*
+ * request asynchronously so that we can overlap
+ * the preparation of the next I/O
+ * if there are already too many outstanding reads
+ * wait until some have completed before issuing the next read
+ */
+ cluster_iostate_wait(&iostate, max_rd_ahead, "cluster_read_direct");
+
+ if (iostate.io_error) {
+ /*
+ * one of the earlier reads we issued ran into a hard error
+ * don't issue any more reads, cleanup the UPL
+ * that was just created but not used, then
+ * go wait for any other reads to complete before
+ * returning the error to the caller
+ */
+ ubc_upl_abort(upl, 0);
+
+ goto wait_for_dreads;
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_START,
+ upl, (int)upl_offset, (int)uio->uio_offset, io_size, 0);
+
+ if(!useVectorUPL) {
+ if (no_zero_fill)
+ io_flag &= ~CL_PRESERVE;
+ else
+ io_flag |= CL_PRESERVE;
+
+ retval = cluster_io(vp, upl, upl_offset, uio->uio_offset, io_size, io_flag, (buf_t)NULL, &iostate, callback, callback_arg);
+
+ } else {
+
+ if(!vector_upl_index) {
+ vector_upl = vector_upl_create(upl_offset);
+ v_upl_uio_offset = uio->uio_offset;
+ vector_upl_offset = upl_offset;
+ }
+
+ vector_upl_set_subupl(vector_upl,upl, upl_size);
+ vector_upl_set_iostate(vector_upl, upl, vector_upl_size, upl_size);
+ vector_upl_index++;
+ vector_upl_size += upl_size;
+ vector_upl_iosize += io_size;
+
+ if(issueVectorUPL || vector_upl_index == MAX_VECTOR_UPL_ELEMENTS || vector_upl_size >= max_vector_size) {
+ retval = vector_cluster_io(vp, vector_upl, vector_upl_offset, v_upl_uio_offset, vector_upl_iosize, io_flag, (buf_t)NULL, &iostate, callback, callback_arg);
+ reset_vector_run_state();
+ }
+ }
+ last_iov_base = iov_base + io_size;
+
+ if (lock) {
+ // We don't need to wait for the I/O to complete
+ cluster_unlock_direct_read(lock);
+ lock = NULL;
+ }
+
+ /*
+ * update the uio structure
+ */
+ if ((flags & IO_ENCRYPTED) && (max_io_size < io_size)) {
+ uio_update(uio, (user_size_t)max_io_size);
+ }
+ else {
+ uio_update(uio, (user_size_t)io_size);
+ }
+
+ io_req_size -= io_size;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_END,
+ upl, (int)uio->uio_offset, io_req_size, retval, 0);
+
+ } /* end while */
+
+ if (retval == 0 && iostate.io_error == 0 && io_req_size == 0 && uio->uio_offset < filesize) {
+
+ retval = cluster_io_type(uio, read_type, read_length, 0);
+
+ if (retval == 0 && *read_type == IO_DIRECT) {
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_NONE,
+ (int)uio->uio_offset, (int)filesize, *read_type, *read_length, 0);
+
+ goto next_dread;
+ }
+ }
+
+wait_for_dreads:
+
+ if(retval == 0 && iostate.io_error == 0 && useVectorUPL && vector_upl_index) {
+ retval = vector_cluster_io(vp, vector_upl, vector_upl_offset, v_upl_uio_offset, vector_upl_iosize, io_flag, (buf_t)NULL, &iostate, callback, callback_arg);
+ reset_vector_run_state();
+ }
+
+ // We don't need to wait for the I/O to complete
+ if (lock)
+ cluster_unlock_direct_read(lock);
+
+ /*
+ * make sure all async reads that are part of this stream
+ * have completed before we return
+ */
+ cluster_iostate_wait(&iostate, 0, "cluster_read_direct");
+
+ if (iostate.io_error)
+ retval = iostate.io_error;
+
+ lck_mtx_destroy(&iostate.io_mtxp, cl_mtx_grp);
+
+ if (io_throttled == TRUE && retval == 0)
+ retval = EAGAIN;
+
+ for (next_iov_base = orig_iov_base; next_iov_base < last_iov_base; next_iov_base += PAGE_SIZE) {
+ /*
+ * This is specifically done for pmap accounting purposes.
+ * vm_pre_fault() will call vm_fault() to enter the page into
+ * the pmap if there isn't _a_ physical page for that VA already.
+ */
+ vm_pre_fault(vm_map_trunc_page(next_iov_base, PAGE_MASK));
+ }
+
+ if (io_req_size && retval == 0) {
+ /*
+ * we couldn't handle the tail of this request in DIRECT mode
+ * so fire it through the copy path
+ */
+ retval = cluster_read_copy(vp, uio, io_req_size, filesize, flags, callback, callback_arg);
+
+ *read_type = IO_UNKNOWN;
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_END,
+ (int)uio->uio_offset, (int)uio_resid(uio), io_req_size, retval, 0);
+
+ return (retval);
+}
+
+
+static int
+cluster_read_contig(vnode_t vp, struct uio *uio, off_t filesize, int *read_type, u_int32_t *read_length,
+ int (*callback)(buf_t, void *), void *callback_arg, int flags)
+{
+ upl_page_info_t *pl;
+ upl_t upl[MAX_VECTS];
+ vm_offset_t upl_offset;
+ addr64_t dst_paddr = 0;
+ user_addr_t iov_base;
+ off_t max_size;
+ upl_size_t upl_size;
+ vm_size_t upl_needed_size;
+ mach_msg_type_number_t pages_in_pl;
+ upl_control_flags_t upl_flags;
+ kern_return_t kret;
+ struct clios iostate;
+ int error= 0;
+ int cur_upl = 0;
+ int num_upl = 0;
+ int n;
+ u_int32_t xsize;
+ u_int32_t io_size;
+ u_int32_t devblocksize;
+ u_int32_t mem_alignment_mask;
+ u_int32_t tail_size = 0;
+ int bflag;
+
+ if (flags & IO_PASSIVE)
+ bflag = CL_PASSIVE;
+ else
+ bflag = 0;
+
+ if (flags & IO_NOCACHE)
+ bflag |= CL_NOCACHE;
+
+ /*
+ * When we enter this routine, we know
+ * -- the read_length will not exceed the current iov_len
+ * -- the target address is physically contiguous for read_length
+ */
+ cluster_syncup(vp, filesize, callback, callback_arg, PUSH_SYNC);
+
+ devblocksize = (u_int32_t)vp->v_mount->mnt_devblocksize;
+ mem_alignment_mask = (u_int32_t)vp->v_mount->mnt_alignmentmask;
+
+ iostate.io_completed = 0;
+ iostate.io_issued = 0;
+ iostate.io_error = 0;
+ iostate.io_wanted = 0;
+
+ lck_mtx_init(&iostate.io_mtxp, cl_mtx_grp, cl_mtx_attr);
+
+next_cread:
+ io_size = *read_length;
+
+ max_size = filesize - uio->uio_offset;
+
+ if (io_size > max_size)
+ io_size = max_size;
+
+ iov_base = uio_curriovbase(uio);
+
+ upl_offset = (vm_offset_t)((u_int32_t)iov_base & PAGE_MASK);
+ upl_needed_size = upl_offset + io_size;
+
+ pages_in_pl = 0;
+ upl_size = upl_needed_size;
+ upl_flags = UPL_FILE_IO | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL | UPL_SET_LITE | UPL_SET_IO_WIRE
+ | UPL_MEMORY_TAG_MAKE(VM_KERN_MEMORY_FILE);
+
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 92)) | DBG_FUNC_START,
+ (int)upl_offset, (int)upl_size, (int)iov_base, io_size, 0);
+
+ vm_map_t map = UIO_SEG_IS_USER_SPACE(uio->uio_segflg) ? current_map() : kernel_map;
+ kret = vm_map_get_upl(map,
+ (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)),
+ &upl_size, &upl[cur_upl], NULL, &pages_in_pl, &upl_flags, 0);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 92)) | DBG_FUNC_END,
+ (int)upl_offset, upl_size, io_size, kret, 0);
+
+ if (kret != KERN_SUCCESS) {
+ /*
+ * failed to get pagelist
+ */
+ error = EINVAL;
+ goto wait_for_creads;
+ }
+ num_upl++;
+
+ if (upl_size < upl_needed_size) {
+ /*
+ * The upl_size wasn't satisfied.
+ */
+ error = EINVAL;
+ goto wait_for_creads;
+ }
+ pl = ubc_upl_pageinfo(upl[cur_upl]);
+
+ dst_paddr = ((addr64_t)upl_phys_page(pl, 0) << PAGE_SHIFT) + (addr64_t)upl_offset;
+
+ while (((uio->uio_offset & (devblocksize - 1)) || io_size < devblocksize) && io_size) {
+ u_int32_t head_size;
+
+ head_size = devblocksize - (u_int32_t)(uio->uio_offset & (devblocksize - 1));
+
+ if (head_size > io_size)
+ head_size = io_size;
+
+ error = cluster_align_phys_io(vp, uio, dst_paddr, head_size, CL_READ, callback, callback_arg);
+
+ if (error)
+ goto wait_for_creads;
+
+ upl_offset += head_size;
+ dst_paddr += head_size;
+ io_size -= head_size;
+
+ iov_base += head_size;
+ }
+ if ((u_int32_t)iov_base & mem_alignment_mask) {
+ /*
+ * request doesn't set up on a memory boundary
+ * the underlying DMA engine can handle...
+ * return an error instead of going through
+ * the slow copy path since the intent of this
+ * path is direct I/O to device memory
+ */
+ error = EINVAL;
+ goto wait_for_creads;
+ }
+
+ tail_size = io_size & (devblocksize - 1);
+
+ io_size -= tail_size;
+
+ while (io_size && error == 0) {
+
+ if (io_size > MAX_IO_CONTIG_SIZE)
+ xsize = MAX_IO_CONTIG_SIZE;
+ else
+ xsize = io_size;
+ /*
+ * request asynchronously so that we can overlap
+ * the preparation of the next I/O... we'll do
+ * the commit after all the I/O has completed
+ * since its all issued against the same UPL
+ * if there are already too many outstanding reads
+ * wait until some have completed before issuing the next
+ */
+ cluster_iostate_wait(&iostate, MAX_IO_CONTIG_SIZE * IO_SCALE(vp, 2), "cluster_read_contig");
+
+ if (iostate.io_error) {
+ /*
+ * one of the earlier reads we issued ran into a hard error
+ * don't issue any more reads...
+ * go wait for any other reads to complete before
+ * returning the error to the caller
+ */
+ goto wait_for_creads;
+ }
+ error = cluster_io(vp, upl[cur_upl], upl_offset, uio->uio_offset, xsize,
+ CL_READ | CL_NOZERO | CL_DEV_MEMORY | CL_ASYNC | bflag,
+ (buf_t)NULL, &iostate, callback, callback_arg);
+ /*
+ * The cluster_io read was issued successfully,
+ * update the uio structure
+ */
+ if (error == 0) {
+ uio_update(uio, (user_size_t)xsize);
+
+ dst_paddr += xsize;
+ upl_offset += xsize;
+ io_size -= xsize;
+ }
+ }
+ if (error == 0 && iostate.io_error == 0 && tail_size == 0 && num_upl < MAX_VECTS && uio->uio_offset < filesize) {
+
+ error = cluster_io_type(uio, read_type, read_length, 0);
+
+ if (error == 0 && *read_type == IO_CONTIG) {
+ cur_upl++;
+ goto next_cread;
+ }
+ } else
+ *read_type = IO_UNKNOWN;
+
+wait_for_creads:
+ /*
+ * make sure all async reads that are part of this stream
+ * have completed before we proceed
+ */
+ cluster_iostate_wait(&iostate, 0, "cluster_read_contig");
+
+ if (iostate.io_error)
+ error = iostate.io_error;
+
+ lck_mtx_destroy(&iostate.io_mtxp, cl_mtx_grp);
+
+ if (error == 0 && tail_size)
+ error = cluster_align_phys_io(vp, uio, dst_paddr, tail_size, CL_READ, callback, callback_arg);
+
+ for (n = 0; n < num_upl; n++)
+ /*
+ * just release our hold on each physically contiguous
+ * region without changing any state
+ */
+ ubc_upl_abort(upl[n], 0);
+
+ return (error);
+}
+
+
+static int
+cluster_io_type(struct uio *uio, int *io_type, u_int32_t *io_length, u_int32_t min_length)
+{
+ user_size_t iov_len;
+ user_addr_t iov_base = 0;
+ upl_t upl;
+ upl_size_t upl_size;
+ upl_control_flags_t upl_flags;
+ int retval = 0;
+
+ /*
+ * skip over any emtpy vectors
+ */
+ uio_update(uio, (user_size_t)0);
+
+ iov_len = uio_curriovlen(uio);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 94)) | DBG_FUNC_START, uio, (int)iov_len, 0, 0, 0);
+
+ if (iov_len) {
+ iov_base = uio_curriovbase(uio);
+ /*
+ * make sure the size of the vector isn't too big...
+ * internally, we want to handle all of the I/O in
+ * chunk sizes that fit in a 32 bit int
+ */
+ if (iov_len > (user_size_t)MAX_IO_REQUEST_SIZE)
+ upl_size = MAX_IO_REQUEST_SIZE;
+ else
+ upl_size = (u_int32_t)iov_len;
+
+ upl_flags = UPL_QUERY_OBJECT_TYPE | UPL_MEMORY_TAG_MAKE(VM_KERN_MEMORY_FILE);
+
+ vm_map_t map = UIO_SEG_IS_USER_SPACE(uio->uio_segflg) ? current_map() : kernel_map;
+ if ((vm_map_get_upl(map,
+ (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)),
+ &upl_size, &upl, NULL, NULL, &upl_flags, 0)) != KERN_SUCCESS) {
+ /*
+ * the user app must have passed in an invalid address
+ */
+ retval = EFAULT;
+ }
+ if (upl_size == 0)
+ retval = EFAULT;
+
+ *io_length = upl_size;
+
+ if (upl_flags & UPL_PHYS_CONTIG)
+ *io_type = IO_CONTIG;
+ else if (iov_len >= min_length)
+ *io_type = IO_DIRECT;
+ else
+ *io_type = IO_COPY;
+ } else {
+ /*
+ * nothing left to do for this uio
+ */
+ *io_length = 0;
+ *io_type = IO_UNKNOWN;
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 94)) | DBG_FUNC_END, iov_base, *io_type, *io_length, retval, 0);
+
+ return (retval);
+}
+
+
+/*
+ * generate advisory I/O's in the largest chunks possible
+ * the completed pages will be released into the VM cache
+ */
+int
+advisory_read(vnode_t vp, off_t filesize, off_t f_offset, int resid)
+{
+ return advisory_read_ext(vp, filesize, f_offset, resid, NULL, NULL, CL_PASSIVE);
+}
+
+int
+advisory_read_ext(vnode_t vp, off_t filesize, off_t f_offset, int resid, int (*callback)(buf_t, void *), void *callback_arg, int bflag)
+{
+ upl_page_info_t *pl;
+ upl_t upl;
+ vm_offset_t upl_offset;
+ int upl_size;
+ off_t upl_f_offset;
+ int start_offset;
+ int start_pg;
+ int last_pg;
+ int pages_in_upl;
+ off_t max_size;
+ int io_size;
+ kern_return_t kret;
+ int retval = 0;
+ int issued_io;
+ int skip_range;
+ uint32_t max_io_size;
+
+
+ if ( !UBCINFOEXISTS(vp))
+ return(EINVAL);
+
+ if (resid < 0)
+ return(EINVAL);
+
+ max_io_size = cluster_max_io_size(vp->v_mount, CL_READ);
+
+ if ((vp->v_mount->mnt_kern_flag & MNTK_SSD) && !ignore_is_ssd) {
+ if (max_io_size > speculative_prefetch_max_iosize)
+ max_io_size = speculative_prefetch_max_iosize;
+ }
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 60)) | DBG_FUNC_START,
+ (int)f_offset, resid, (int)filesize, 0, 0);
+
+ while (resid && f_offset < filesize && retval == 0) {
+ /*
+ * compute the size of the upl needed to encompass
+ * the requested read... limit each call to cluster_io
+ * to the maximum UPL size... cluster_io will clip if
+ * this exceeds the maximum io_size for the device,
+ * make sure to account for
+ * a starting offset that's not page aligned
+ */
+ start_offset = (int)(f_offset & PAGE_MASK_64);
+ upl_f_offset = f_offset - (off_t)start_offset;
+ max_size = filesize - f_offset;
+
+ if (resid < max_size)
+ io_size = resid;
+ else
+ io_size = max_size;
+
+ upl_size = (start_offset + io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
+ if ((uint32_t)upl_size > max_io_size)
+ upl_size = max_io_size;
+
+ skip_range = 0;
+ /*
+ * return the number of contiguously present pages in the cache
+ * starting at upl_f_offset within the file
+ */
+ ubc_range_op(vp, upl_f_offset, upl_f_offset + upl_size, UPL_ROP_PRESENT, &skip_range);
+
+ if (skip_range) {
+ /*
+ * skip over pages already present in the cache
+ */
+ io_size = skip_range - start_offset;
+
+ f_offset += io_size;
+ resid -= io_size;
+
+ if (skip_range == upl_size)
+ continue;
+ /*
+ * have to issue some real I/O
+ * at this point, we know it's starting on a page boundary
+ * because we've skipped over at least the first page in the request
+ */
+ start_offset = 0;
+ upl_f_offset += skip_range;
+ upl_size -= skip_range;
+ }
+ pages_in_upl = upl_size / PAGE_SIZE;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 61)) | DBG_FUNC_START,
+ upl, (int)upl_f_offset, upl_size, start_offset, 0);
+
+ kret = ubc_create_upl(vp,
+ upl_f_offset,
+ upl_size,
+ &upl,
+ &pl,
+ UPL_RET_ONLY_ABSENT | UPL_SET_LITE);
+ if (kret != KERN_SUCCESS)
+ return(retval);
+ issued_io = 0;
+
+ /*
+ * before we start marching forward, we must make sure we end on
+ * a present page, otherwise we will be working with a freed
+ * upl
+ */
+ for (last_pg = pages_in_upl - 1; last_pg >= 0; last_pg--) {
+ if (upl_page_present(pl, last_pg))
+ break;
+ }
+ pages_in_upl = last_pg + 1;
+
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 61)) | DBG_FUNC_END,
+ upl, (int)upl_f_offset, upl_size, start_offset, 0);
+
+
+ for (last_pg = 0; last_pg < pages_in_upl; ) {
+ /*
+ * scan from the beginning of the upl looking for the first
+ * page that is present.... this will become the first page in
+ * the request we're going to make to 'cluster_io'... if all
+ * of the pages are absent, we won't call through to 'cluster_io'
+ */
+ for (start_pg = last_pg; start_pg < pages_in_upl; start_pg++) {
+ if (upl_page_present(pl, start_pg))
+ break;
+ }
+
+ /*
+ * scan from the starting present page looking for an absent
+ * page before the end of the upl is reached, if we
+ * find one, then it will terminate the range of pages being
+ * presented to 'cluster_io'
+ */
+ for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) {
+ if (!upl_page_present(pl, last_pg))
+ break;
+ }
+
+ if (last_pg > start_pg) {
+ /*
+ * we found a range of pages that must be filled
+ * if the last page in this range is the last page of the file
+ * we may have to clip the size of it to keep from reading past
+ * the end of the last physical block associated with the file
+ */
+ upl_offset = start_pg * PAGE_SIZE;
+ io_size = (last_pg - start_pg) * PAGE_SIZE;
+
+ if ((off_t)(upl_f_offset + upl_offset + io_size) > filesize)
+ io_size = filesize - (upl_f_offset + upl_offset);
+
+ /*
+ * issue an asynchronous read to cluster_io
+ */
+ retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size,
+ CL_ASYNC | CL_READ | CL_COMMIT | CL_AGE | bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg);
+
+ issued_io = 1;
+ }
+ }
+ if (issued_io == 0)
+ ubc_upl_abort(upl, 0);
+
+ io_size = upl_size - start_offset;
+
+ if (io_size > resid)
+ io_size = resid;
+ f_offset += io_size;
+ resid -= io_size;
+ }
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 60)) | DBG_FUNC_END,
+ (int)f_offset, resid, retval, 0, 0);
+
+ return(retval);
+}
+
+
+int
+cluster_push(vnode_t vp, int flags)
+{
+ return cluster_push_ext(vp, flags, NULL, NULL);
+}
+
+
+int
+cluster_push_ext(vnode_t vp, int flags, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ return cluster_push_err(vp, flags, callback, callback_arg, NULL);
+}
+
+/* write errors via err, but return the number of clusters written */
+int
+cluster_push_err(vnode_t vp, int flags, int (*callback)(buf_t, void *), void *callback_arg, int *err)
+{
+ int retval;
+ int my_sparse_wait = 0;
+ struct cl_writebehind *wbp;
+
+ if (err)
+ *err = 0;
+
+ if ( !UBCINFOEXISTS(vp)) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_NONE, kdebug_vnode(vp), flags, 0, -1, 0);
+ return (0);
+ }
+ /* return if deferred write is set */
+ if (((unsigned int)vfs_flags(vp->v_mount) & MNT_DEFWRITE) && (flags & IO_DEFWRITE)) {
+ return (0);
+ }
+ if ((wbp = cluster_get_wbp(vp, CLW_RETURNLOCKED)) == NULL) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_NONE, kdebug_vnode(vp), flags, 0, -2, 0);
+ return (0);
+ }
+ if (!ISSET(flags, IO_SYNC) && wbp->cl_number == 0 && wbp->cl_scmap == NULL) {
+ lck_mtx_unlock(&wbp->cl_lockw);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_NONE, kdebug_vnode(vp), flags, 0, -3, 0);
+ return(0);
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_START,
+ wbp->cl_scmap, wbp->cl_number, flags, 0, 0);
+
+ /*
+ * if we have an fsync in progress, we don't want to allow any additional
+ * sync/fsync/close(s) to occur until it finishes.
+ * note that its possible for writes to continue to occur to this file
+ * while we're waiting and also once the fsync starts to clean if we're
+ * in the sparse map case
+ */
+ while (wbp->cl_sparse_wait) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 97)) | DBG_FUNC_START, kdebug_vnode(vp), 0, 0, 0, 0);
+
+ msleep((caddr_t)&wbp->cl_sparse_wait, &wbp->cl_lockw, PRIBIO + 1, "cluster_push_ext", NULL);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 97)) | DBG_FUNC_END, kdebug_vnode(vp), 0, 0, 0, 0);
+ }
+ if (flags & IO_SYNC) {
+ my_sparse_wait = 1;
+ wbp->cl_sparse_wait = 1;
+
+ /*
+ * this is an fsync (or equivalent)... we must wait for any existing async
+ * cleaning operations to complete before we evaulate the current state
+ * and finish cleaning... this insures that all writes issued before this
+ * fsync actually get cleaned to the disk before this fsync returns
+ */
+ while (wbp->cl_sparse_pushes) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 98)) | DBG_FUNC_START, kdebug_vnode(vp), 0, 0, 0, 0);
+
+ msleep((caddr_t)&wbp->cl_sparse_pushes, &wbp->cl_lockw, PRIBIO + 1, "cluster_push_ext", NULL);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 98)) | DBG_FUNC_END, kdebug_vnode(vp), 0, 0, 0, 0);
+ }
+ }
+ if (wbp->cl_scmap) {
+ void *scmap;
+
+ if (wbp->cl_sparse_pushes < SPARSE_PUSH_LIMIT) {
+
+ scmap = wbp->cl_scmap;
+ wbp->cl_scmap = NULL;
+
+ wbp->cl_sparse_pushes++;
+
+ lck_mtx_unlock(&wbp->cl_lockw);
+
+ retval = sparse_cluster_push(&scmap, vp, ubc_getsize(vp), PUSH_ALL, flags, callback, callback_arg);
+
+ lck_mtx_lock(&wbp->cl_lockw);
+
+ wbp->cl_sparse_pushes--;
+
+ if (wbp->cl_sparse_wait && wbp->cl_sparse_pushes == 0)
+ wakeup((caddr_t)&wbp->cl_sparse_pushes);
+ } else {
+ retval = sparse_cluster_push(&(wbp->cl_scmap), vp, ubc_getsize(vp), PUSH_ALL, flags, callback, callback_arg);
+ }
+ if (err)
+ *err = retval;
+ retval = 1;
+ } else {
+ retval = cluster_try_push(wbp, vp, ubc_getsize(vp), PUSH_ALL, flags, callback, callback_arg, err);
+ }
+ lck_mtx_unlock(&wbp->cl_lockw);
+
+ if (flags & IO_SYNC)
+ (void)vnode_waitforwrites(vp, 0, 0, 0, "cluster_push");
+
+ if (my_sparse_wait) {
+ /*
+ * I'm the owner of the serialization token
+ * clear it and wakeup anyone that is waiting
+ * for me to finish
+ */
+ lck_mtx_lock(&wbp->cl_lockw);
+
+ wbp->cl_sparse_wait = 0;
+ wakeup((caddr_t)&wbp->cl_sparse_wait);
+
+ lck_mtx_unlock(&wbp->cl_lockw);
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_END,
+ wbp->cl_scmap, wbp->cl_number, retval, 0, 0);
+
+ return (retval);
+}
+
+
+__private_extern__ void
+cluster_release(struct ubc_info *ubc)
+{
+ struct cl_writebehind *wbp;
+ struct cl_readahead *rap;
+
+ if ((wbp = ubc->cl_wbehind)) {
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 81)) | DBG_FUNC_START, ubc, wbp->cl_scmap, 0, 0, 0);
+
+ if (wbp->cl_scmap)
+ vfs_drt_control(&(wbp->cl_scmap), 0);
+ } else {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 81)) | DBG_FUNC_START, ubc, 0, 0, 0, 0);
+ }
+
+ rap = ubc->cl_rahead;
+
+ if (wbp != NULL) {
+ lck_mtx_destroy(&wbp->cl_lockw, cl_mtx_grp);
+ FREE_ZONE((void *)wbp, sizeof *wbp, M_CLWRBEHIND);
+ }
+ if ((rap = ubc->cl_rahead)) {
+ lck_mtx_destroy(&rap->cl_lockr, cl_mtx_grp);
+ FREE_ZONE((void *)rap, sizeof *rap, M_CLRDAHEAD);
+ }
+ ubc->cl_rahead = NULL;
+ ubc->cl_wbehind = NULL;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 81)) | DBG_FUNC_END, ubc, rap, wbp, 0, 0);
+}
+
+
+static int
+cluster_try_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int push_flag, int io_flags, int (*callback)(buf_t, void *), void *callback_arg, int *err)
+{
+ int cl_index;
+ int cl_index1;
+ int min_index;
+ int cl_len;
+ int cl_pushed = 0;
+ struct cl_wextent l_clusters[MAX_CLUSTERS];
+ u_int max_cluster_pgcount;
+ int error = 0;
+
+ max_cluster_pgcount = MAX_CLUSTER_SIZE(vp) / PAGE_SIZE;
+ /*
+ * the write behind context exists and has
+ * already been locked...
+ */
+ if (wbp->cl_number == 0)
+ /*
+ * no clusters to push
+ * return number of empty slots
+ */
+ return (MAX_CLUSTERS);
+
+ /*
+ * make a local 'sorted' copy of the clusters
+ * and clear wbp->cl_number so that new clusters can
+ * be developed
+ */
+ for (cl_index = 0; cl_index < wbp->cl_number; cl_index++) {
+ for (min_index = -1, cl_index1 = 0; cl_index1 < wbp->cl_number; cl_index1++) {
+ if (wbp->cl_clusters[cl_index1].b_addr == wbp->cl_clusters[cl_index1].e_addr)
+ continue;
+ if (min_index == -1)
+ min_index = cl_index1;
+ else if (wbp->cl_clusters[cl_index1].b_addr < wbp->cl_clusters[min_index].b_addr)
+ min_index = cl_index1;
+ }
+ if (min_index == -1)
+ break;
+
+ l_clusters[cl_index].b_addr = wbp->cl_clusters[min_index].b_addr;
+ l_clusters[cl_index].e_addr = wbp->cl_clusters[min_index].e_addr;
+ l_clusters[cl_index].io_flags = wbp->cl_clusters[min_index].io_flags;
+
+ wbp->cl_clusters[min_index].b_addr = wbp->cl_clusters[min_index].e_addr;
+ }
+ wbp->cl_number = 0;
+
+ cl_len = cl_index;
+
+ /* skip switching to the sparse cluster mechanism if on diskimage */
+ if ( ((push_flag & PUSH_DELAY) && cl_len == MAX_CLUSTERS ) &&
+ !(vp->v_mount->mnt_kern_flag & MNTK_VIRTUALDEV) ) {
+ int i;
+
+ /*
+ * determine if we appear to be writing the file sequentially
+ * if not, by returning without having pushed any clusters
+ * we will cause this vnode to be pushed into the sparse cluster mechanism
+ * used for managing more random I/O patterns
+ *
+ * we know that we've got all clusters currently in use and the next write doesn't fit into one of them...
+ * that's why we're in try_push with PUSH_DELAY...
+ *
+ * check to make sure that all the clusters except the last one are 'full'... and that each cluster
+ * is adjacent to the next (i.e. we're looking for sequential writes) they were sorted above
+ * so we can just make a simple pass through, up to, but not including the last one...
+ * note that e_addr is not inclusive, so it will be equal to the b_addr of the next cluster if they
+ * are sequential
+ *
+ * we let the last one be partial as long as it was adjacent to the previous one...
+ * we need to do this to deal with multi-threaded servers that might write an I/O or 2 out
+ * of order... if this occurs at the tail of the last cluster, we don't want to fall into the sparse cluster world...
+ */
+ for (i = 0; i < MAX_CLUSTERS - 1; i++) {
+ if ((l_clusters[i].e_addr - l_clusters[i].b_addr) != max_cluster_pgcount)
+ goto dont_try;
+ if (l_clusters[i].e_addr != l_clusters[i+1].b_addr)
+ goto dont_try;
+ }
+ }
+ for (cl_index = 0; cl_index < cl_len; cl_index++) {
+ int flags;
+ struct cl_extent cl;
+ int retval;
+
+ flags = io_flags & (IO_PASSIVE|IO_CLOSE);
+
+ /*
+ * try to push each cluster in turn...
+ */
+ if (l_clusters[cl_index].io_flags & CLW_IONOCACHE)
+ flags |= IO_NOCACHE;
+
+ if (l_clusters[cl_index].io_flags & CLW_IOPASSIVE)
+ flags |= IO_PASSIVE;
+
+ if (push_flag & PUSH_SYNC)
+ flags |= IO_SYNC;
+
+ cl.b_addr = l_clusters[cl_index].b_addr;
+ cl.e_addr = l_clusters[cl_index].e_addr;
+
+ retval = cluster_push_now(vp, &cl, EOF, flags, callback, callback_arg);
+
+ if (error == 0 && retval)
+ error = retval;
+
+ l_clusters[cl_index].b_addr = 0;
+ l_clusters[cl_index].e_addr = 0;
+
+ cl_pushed++;
+
+ if ( !(push_flag & PUSH_ALL) )
+ break;
+ }
+ if (err)
+ *err = error;
+
+dont_try:
+ if (cl_len > cl_pushed) {
+ /*
+ * we didn't push all of the clusters, so
+ * lets try to merge them back in to the vnode
+ */
+ if ((MAX_CLUSTERS - wbp->cl_number) < (cl_len - cl_pushed)) {
+ /*
+ * we picked up some new clusters while we were trying to
+ * push the old ones... this can happen because I've dropped
+ * the vnode lock... the sum of the
+ * leftovers plus the new cluster count exceeds our ability
+ * to represent them, so switch to the sparse cluster mechanism
+ *
+ * collect the active public clusters...
+ */
+ sparse_cluster_switch(wbp, vp, EOF, callback, callback_arg);
+
+ for (cl_index = 0, cl_index1 = 0; cl_index < cl_len; cl_index++) {
+ if (l_clusters[cl_index].b_addr == l_clusters[cl_index].e_addr)
+ continue;
+ wbp->cl_clusters[cl_index1].b_addr = l_clusters[cl_index].b_addr;
+ wbp->cl_clusters[cl_index1].e_addr = l_clusters[cl_index].e_addr;
+ wbp->cl_clusters[cl_index1].io_flags = l_clusters[cl_index].io_flags;
+
+ cl_index1++;
+ }
+ /*
+ * update the cluster count
+ */
+ wbp->cl_number = cl_index1;
+
+ /*
+ * and collect the original clusters that were moved into the
+ * local storage for sorting purposes
+ */
+ sparse_cluster_switch(wbp, vp, EOF, callback, callback_arg);
+
+ } else {
+ /*
+ * we've got room to merge the leftovers back in
+ * just append them starting at the next 'hole'
+ * represented by wbp->cl_number
+ */
+ for (cl_index = 0, cl_index1 = wbp->cl_number; cl_index < cl_len; cl_index++) {
+ if (l_clusters[cl_index].b_addr == l_clusters[cl_index].e_addr)
+ continue;
+
+ wbp->cl_clusters[cl_index1].b_addr = l_clusters[cl_index].b_addr;
+ wbp->cl_clusters[cl_index1].e_addr = l_clusters[cl_index].e_addr;
+ wbp->cl_clusters[cl_index1].io_flags = l_clusters[cl_index].io_flags;
+
+ cl_index1++;
+ }
+ /*
+ * update the cluster count
+ */
+ wbp->cl_number = cl_index1;
+ }
+ }
+ return (MAX_CLUSTERS - wbp->cl_number);
+}
+
+
+
+static int
+cluster_push_now(vnode_t vp, struct cl_extent *cl, off_t EOF, int flags, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ upl_page_info_t *pl;
+ upl_t upl;
+ vm_offset_t upl_offset;
+ int upl_size;
+ off_t upl_f_offset;
+ int pages_in_upl;
+ int start_pg;
+ int last_pg;
+ int io_size;
+ int io_flags;
+ int upl_flags;
+ int bflag;
+ int size;
+ int error = 0;
+ int retval;
+ kern_return_t kret;
+
+ if (flags & IO_PASSIVE)
+ bflag = CL_PASSIVE;
+ else
+ bflag = 0;
+
+ if (flags & IO_SKIP_ENCRYPTION)
+ bflag |= CL_ENCRYPTED;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_START,
+ (int)cl->b_addr, (int)cl->e_addr, (int)EOF, flags, 0);
+
+ if ((pages_in_upl = (int)(cl->e_addr - cl->b_addr)) == 0) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 1, 0, 0, 0, 0);
+
+ return (0);
+ }
+ upl_size = pages_in_upl * PAGE_SIZE;
+ upl_f_offset = (off_t)(cl->b_addr * PAGE_SIZE_64);
+
+ if (upl_f_offset + upl_size >= EOF) {
+
+ if (upl_f_offset >= EOF) {
+ /*
+ * must have truncated the file and missed
+ * clearing a dangling cluster (i.e. it's completely
+ * beyond the new EOF
+ */
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 1, 1, 0, 0, 0);
+
+ return(0);
+ }
+ size = EOF - upl_f_offset;
+
+ upl_size = (size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
+ pages_in_upl = upl_size / PAGE_SIZE;
+ } else
+ size = upl_size;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_START, upl_size, size, 0, 0, 0);
+
+ /*
+ * by asking for UPL_COPYOUT_FROM and UPL_RET_ONLY_DIRTY, we get the following desirable behavior
+ *
+ * - only pages that are currently dirty are returned... these are the ones we need to clean
+ * - the hardware dirty bit is cleared when the page is gathered into the UPL... the software dirty bit is set
+ * - if we have to abort the I/O for some reason, the software dirty bit is left set since we didn't clean the page
+ * - when we commit the page, the software dirty bit is cleared... the hardware dirty bit is untouched so that if
+ * someone dirties this page while the I/O is in progress, we don't lose track of the new state
+ *
+ * when the I/O completes, we no longer ask for an explicit clear of the DIRTY state (either soft or hard)
+ */
+
+ if ((vp->v_flag & VNOCACHE_DATA) || (flags & IO_NOCACHE))
+ upl_flags = UPL_COPYOUT_FROM | UPL_RET_ONLY_DIRTY | UPL_SET_LITE | UPL_WILL_BE_DUMPED;
+ else
+ upl_flags = UPL_COPYOUT_FROM | UPL_RET_ONLY_DIRTY | UPL_SET_LITE;
+
+ kret = ubc_create_upl(vp,
+ upl_f_offset,
+ upl_size,
+ &upl,
+ &pl,
+ upl_flags);
+ if (kret != KERN_SUCCESS)
+ panic("cluster_push: failed to get pagelist");
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_END, upl, upl_f_offset, 0, 0, 0);
+
+ /*
+ * since we only asked for the dirty pages back
+ * it's possible that we may only get a few or even none, so...
+ * before we start marching forward, we must make sure we know
+ * where the last present page is in the UPL, otherwise we could
+ * end up working with a freed upl due to the FREE_ON_EMPTY semantics
+ * employed by commit_range and abort_range.
+ */
+ for (last_pg = pages_in_upl - 1; last_pg >= 0; last_pg--) {
+ if (upl_page_present(pl, last_pg))
+ break;
+ }
+ pages_in_upl = last_pg + 1;
+
+ if (pages_in_upl == 0) {
+ ubc_upl_abort(upl, 0);
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 1, 2, 0, 0, 0);
+ return(0);
+ }
+
+ for (last_pg = 0; last_pg < pages_in_upl; ) {
+ /*
+ * find the next dirty page in the UPL
+ * this will become the first page in the
+ * next I/O to generate
+ */
+ for (start_pg = last_pg; start_pg < pages_in_upl; start_pg++) {
+ if (upl_dirty_page(pl, start_pg))
+ break;
+ if (upl_page_present(pl, start_pg))
+ /*
+ * RET_ONLY_DIRTY will return non-dirty 'precious' pages
+ * just release these unchanged since we're not going
+ * to steal them or change their state
+ */
+ ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY);
+ }
+ if (start_pg >= pages_in_upl)
+ /*
+ * done... no more dirty pages to push
+ */
+ break;
+ if (start_pg > last_pg)
+ /*
+ * skipped over some non-dirty pages
+ */
+ size -= ((start_pg - last_pg) * PAGE_SIZE);
+
+ /*
+ * find a range of dirty pages to write
+ */
+ for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) {
+ if (!upl_dirty_page(pl, last_pg))
+ break;
+ }
+ upl_offset = start_pg * PAGE_SIZE;
+
+ io_size = min(size, (last_pg - start_pg) * PAGE_SIZE);
+
+ io_flags = CL_THROTTLE | CL_COMMIT | CL_AGE | bflag;
+
+ if ( !(flags & IO_SYNC))
+ io_flags |= CL_ASYNC;
+
+ if (flags & IO_CLOSE)
+ io_flags |= CL_CLOSE;
+
+ if (flags & IO_NOCACHE)
+ io_flags |= CL_NOCACHE;
+
+ retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size,
+ io_flags, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg);
+
+ if (error == 0 && retval)
+ error = retval;
+
+ size -= io_size;
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 1, 3, 0, 0, 0);
+
+ return(error);
+}
+
+
+/*
+ * sparse_cluster_switch is called with the write behind lock held
+ */
+static void
+sparse_cluster_switch(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ int cl_index;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 78)) | DBG_FUNC_START, kdebug_vnode(vp), wbp->cl_scmap, 0, 0, 0);
+
+ for (cl_index = 0; cl_index < wbp->cl_number; cl_index++) {
+ int flags;
+ struct cl_extent cl;
+
+ for (cl.b_addr = wbp->cl_clusters[cl_index].b_addr; cl.b_addr < wbp->cl_clusters[cl_index].e_addr; cl.b_addr++) {
+
+ if (ubc_page_op(vp, (off_t)(cl.b_addr * PAGE_SIZE_64), 0, NULL, &flags) == KERN_SUCCESS) {
+ if (flags & UPL_POP_DIRTY) {
+ cl.e_addr = cl.b_addr + 1;
+
+ sparse_cluster_add(&(wbp->cl_scmap), vp, &cl, EOF, callback, callback_arg);
+ }
+ }
+ }
+ }
+ wbp->cl_number = 0;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 78)) | DBG_FUNC_END, kdebug_vnode(vp), wbp->cl_scmap, 0, 0, 0);
+}
+
+
+/*
+ * sparse_cluster_push must be called with the write-behind lock held if the scmap is
+ * still associated with the write-behind context... however, if the scmap has been disassociated
+ * from the write-behind context (the cluster_push case), the wb lock is not held
+ */
+static int
+sparse_cluster_push(void **scmap, vnode_t vp, off_t EOF, int push_flag, int io_flags, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ struct cl_extent cl;
+ off_t offset;
+ u_int length;
+ int error = 0;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 79)) | DBG_FUNC_START, kdebug_vnode(vp), (*scmap), 0, push_flag, 0);
+
+ if (push_flag & PUSH_ALL)
+ vfs_drt_control(scmap, 1);
+
+ for (;;) {
+ int retval;
+ if (vfs_drt_get_cluster(scmap, &offset, &length) != KERN_SUCCESS)
+ break;
+
+ cl.b_addr = (daddr64_t)(offset / PAGE_SIZE_64);
+ cl.e_addr = (daddr64_t)((offset + length) / PAGE_SIZE_64);
+
+ retval = cluster_push_now(vp, &cl, EOF, io_flags & (IO_PASSIVE|IO_CLOSE), callback, callback_arg);
+ if (error == 0 && retval)
+ error = retval;
+
+ if ( !(push_flag & PUSH_ALL) )
+ break;
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 79)) | DBG_FUNC_END, kdebug_vnode(vp), (*scmap), 0, 0, 0);
+
+ return error;
+}
+
+
+/*
+ * sparse_cluster_add is called with the write behind lock held
+ */
+static void
+sparse_cluster_add(void **scmap, vnode_t vp, struct cl_extent *cl, off_t EOF, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ u_int new_dirty;
+ u_int length;
+ off_t offset;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 80)) | DBG_FUNC_START, (*scmap), 0, cl->b_addr, (int)cl->e_addr, 0);
+
+ offset = (off_t)(cl->b_addr * PAGE_SIZE_64);
+ length = ((u_int)(cl->e_addr - cl->b_addr)) * PAGE_SIZE;
+
+ while (vfs_drt_mark_pages(scmap, offset, length, &new_dirty) != KERN_SUCCESS) {
+ /*
+ * no room left in the map
+ * only a partial update was done
+ * push out some pages and try again
+ */
+ sparse_cluster_push(scmap, vp, EOF, 0, 0, callback, callback_arg);
+
+ offset += (new_dirty * PAGE_SIZE_64);
+ length -= (new_dirty * PAGE_SIZE);
+ }
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 80)) | DBG_FUNC_END, kdebug_vnode(vp), (*scmap), 0, 0, 0);
+}
+
+
+static int
+cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, u_int32_t xsize, int flags, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ upl_page_info_t *pl;
+ upl_t upl;
+ addr64_t ubc_paddr;
+ kern_return_t kret;
+ int error = 0;
+ int did_read = 0;
+ int abort_flags;
+ int upl_flags;
+ int bflag;
+
+ if (flags & IO_PASSIVE)
+ bflag = CL_PASSIVE;
+ else
+ bflag = 0;
+
+ if (flags & IO_NOCACHE)
+ bflag |= CL_NOCACHE;
+
+ upl_flags = UPL_SET_LITE;
+
+ if ( !(flags & CL_READ) ) {
+ /*
+ * "write" operation: let the UPL subsystem know
+ * that we intend to modify the buffer cache pages
+ * we're gathering.
+ */
+ upl_flags |= UPL_WILL_MODIFY;
+ } else {
+ /*
+ * indicate that there is no need to pull the
+ * mapping for this page... we're only going
+ * to read from it, not modify it.
+ */
+ upl_flags |= UPL_FILE_IO;
+ }
+ kret = ubc_create_upl(vp,
+ uio->uio_offset & ~PAGE_MASK_64,
+ PAGE_SIZE,
+ &upl,
+ &pl,
+ upl_flags);
+
+ if (kret != KERN_SUCCESS)
+ return(EINVAL);
+
+ if (!upl_valid_page(pl, 0)) {
+ /*
+ * issue a synchronous read to cluster_io
+ */
+ error = cluster_io(vp, upl, 0, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE,
+ CL_READ | bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg);
+ if (error) {
+ ubc_upl_abort_range(upl, 0, PAGE_SIZE, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY);
+
+ return(error);
+ }
+ did_read = 1;
+ }
+ ubc_paddr = ((addr64_t)upl_phys_page(pl, 0) << PAGE_SHIFT) + (addr64_t)(uio->uio_offset & PAGE_MASK_64);
+
+/*
+ * NOTE: There is no prototype for the following in BSD. It, and the definitions
+ * of the defines for cppvPsrc, cppvPsnk, cppvFsnk, and cppvFsrc will be found in
+ * osfmk/ppc/mappings.h. They are not included here because there appears to be no
+ * way to do so without exporting them to kexts as well.
+ */
+ if (flags & CL_READ)
+// copypv(ubc_paddr, usr_paddr, xsize, cppvPsrc | cppvPsnk | cppvFsnk); /* Copy physical to physical and flush the destination */
+ copypv(ubc_paddr, usr_paddr, xsize, 2 | 1 | 4); /* Copy physical to physical and flush the destination */
+ else
+// copypv(usr_paddr, ubc_paddr, xsize, cppvPsrc | cppvPsnk | cppvFsrc); /* Copy physical to physical and flush the source */
+ copypv(usr_paddr, ubc_paddr, xsize, 2 | 1 | 8); /* Copy physical to physical and flush the source */
+
+ if ( !(flags & CL_READ) || (upl_valid_page(pl, 0) && upl_dirty_page(pl, 0))) {
+ /*
+ * issue a synchronous write to cluster_io
+ */
+ error = cluster_io(vp, upl, 0, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE,
+ bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg);
+ }
+ if (error == 0)
+ uio_update(uio, (user_size_t)xsize);
+
+ if (did_read)
+ abort_flags = UPL_ABORT_FREE_ON_EMPTY;
+ else
+ abort_flags = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_DUMP_PAGES;
+
+ ubc_upl_abort_range(upl, 0, PAGE_SIZE, abort_flags);
+
+ return (error);
+}
+
+int
+cluster_copy_upl_data(struct uio *uio, upl_t upl, int upl_offset, int *io_resid)
+{
+ int pg_offset;
+ int pg_index;
+ int csize;
+ int segflg;
+ int retval = 0;
+ int xsize;
+ upl_page_info_t *pl;
+ int dirty_count;
+
+ xsize = *io_resid;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_START,
+ (int)uio->uio_offset, upl_offset, xsize, 0, 0);
+
+ segflg = uio->uio_segflg;
+
+ switch(segflg) {
+
+ case UIO_USERSPACE32:
+ case UIO_USERISPACE32:
+ uio->uio_segflg = UIO_PHYS_USERSPACE32;
+ break;
+
+ case UIO_USERSPACE:
+ case UIO_USERISPACE:
+ uio->uio_segflg = UIO_PHYS_USERSPACE;
+ break;
+
+ case UIO_USERSPACE64:
+ case UIO_USERISPACE64:
+ uio->uio_segflg = UIO_PHYS_USERSPACE64;
+ break;
+
+ case UIO_SYSSPACE:
+ uio->uio_segflg = UIO_PHYS_SYSSPACE;
+ break;
+
+ }
+ pl = ubc_upl_pageinfo(upl);
+
+ pg_index = upl_offset / PAGE_SIZE;
+ pg_offset = upl_offset & PAGE_MASK;
+ csize = min(PAGE_SIZE - pg_offset, xsize);
+
+ dirty_count = 0;
+ while (xsize && retval == 0) {
+ addr64_t paddr;
+
+ paddr = ((addr64_t)upl_phys_page(pl, pg_index) << PAGE_SHIFT) + pg_offset;
+ if ((uio->uio_rw == UIO_WRITE) && (upl_dirty_page(pl, pg_index) == FALSE))
+ dirty_count++;
+
+ retval = uiomove64(paddr, csize, uio);
+
+ pg_index += 1;
+ pg_offset = 0;
+ xsize -= csize;
+ csize = min(PAGE_SIZE, xsize);
+ }
+ *io_resid = xsize;
+
+ uio->uio_segflg = segflg;
+
+ task_update_logical_writes(current_task(), (dirty_count * PAGE_SIZE), TASK_WRITE_DEFERRED, upl_lookup_vnode(upl));
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END,
+ (int)uio->uio_offset, xsize, retval, segflg, 0);
+
+ return (retval);
+}
+
+
+int
+cluster_copy_ubc_data(vnode_t vp, struct uio *uio, int *io_resid, int mark_dirty)
+{
+
+ return (cluster_copy_ubc_data_internal(vp, uio, io_resid, mark_dirty, 1));
+}
+
+
+static int
+cluster_copy_ubc_data_internal(vnode_t vp, struct uio *uio, int *io_resid, int mark_dirty, int take_reference)
+{
+ int segflg;
+ int io_size;
+ int xsize;
+ int start_offset;
+ int retval = 0;
+ memory_object_control_t control;
+
+ io_size = *io_resid;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_START,
+ (int)uio->uio_offset, io_size, mark_dirty, take_reference, 0);
+
+ control = ubc_getobject(vp, UBC_FLAGS_NONE);
+
+ if (control == MEMORY_OBJECT_CONTROL_NULL) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END,
+ (int)uio->uio_offset, io_size, retval, 3, 0);
+
+ return(0);
+ }
+ segflg = uio->uio_segflg;
+
+ switch(segflg) {
+
+ case UIO_USERSPACE32:
+ case UIO_USERISPACE32:
+ uio->uio_segflg = UIO_PHYS_USERSPACE32;
+ break;
+
+ case UIO_USERSPACE64:
+ case UIO_USERISPACE64:
+ uio->uio_segflg = UIO_PHYS_USERSPACE64;
+ break;
+
+ case UIO_USERSPACE:
+ case UIO_USERISPACE:
+ uio->uio_segflg = UIO_PHYS_USERSPACE;
+ break;
+
+ case UIO_SYSSPACE:
+ uio->uio_segflg = UIO_PHYS_SYSSPACE;
+ break;
+ }
+
+ if ( (io_size = *io_resid) ) {
+ start_offset = (int)(uio->uio_offset & PAGE_MASK_64);
+ xsize = uio_resid(uio);
+
+ retval = memory_object_control_uiomove(control, uio->uio_offset - start_offset, uio,
+ start_offset, io_size, mark_dirty, take_reference);
+ xsize -= uio_resid(uio);
+ io_size -= xsize;
+ }
+ uio->uio_segflg = segflg;
+ *io_resid = io_size;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END,
+ (int)uio->uio_offset, io_size, retval, 0x80000000 | segflg, 0);
+
+ return(retval);
+}
+
+
+int
+is_file_clean(vnode_t vp, off_t filesize)
+{
+ off_t f_offset;
+ int flags;
+ int total_dirty = 0;
+
+ for (f_offset = 0; f_offset < filesize; f_offset += PAGE_SIZE_64) {
+ if (ubc_page_op(vp, f_offset, 0, NULL, &flags) == KERN_SUCCESS) {
+ if (flags & UPL_POP_DIRTY) {
+ total_dirty++;
+ }
}
- cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size, io_flags, (struct buf *)0);
+ }
+ if (total_dirty)
+ return(EINVAL);
- size -= io_size;
+ return (0);
+}
+
+
+
+/*
+ * Dirty region tracking/clustering mechanism.
+ *
+ * This code (vfs_drt_*) provides a mechanism for tracking and clustering
+ * dirty regions within a larger space (file). It is primarily intended to
+ * support clustering in large files with many dirty areas.
+ *
+ * The implementation assumes that the dirty regions are pages.
+ *
+ * To represent dirty pages within the file, we store bit vectors in a
+ * variable-size circular hash.
+ */
+
+/*
+ * Bitvector size. This determines the number of pages we group in a
+ * single hashtable entry. Each hashtable entry is aligned to this
+ * size within the file.
+ */
+#define DRT_BITVECTOR_PAGES ((1024 * 1024) / PAGE_SIZE)
+
+/*
+ * File offset handling.
+ *
+ * DRT_ADDRESS_MASK is dependent on DRT_BITVECTOR_PAGES;
+ * the correct formula is (~((DRT_BITVECTOR_PAGES * PAGE_SIZE) - 1))
+ */
+#define DRT_ADDRESS_MASK (~((DRT_BITVECTOR_PAGES * PAGE_SIZE) - 1))
+#define DRT_ALIGN_ADDRESS(addr) ((addr) & DRT_ADDRESS_MASK)
+
+/*
+ * Hashtable address field handling.
+ *
+ * The low-order bits of the hashtable address are used to conserve
+ * space.
+ *
+ * DRT_HASH_COUNT_MASK must be large enough to store the range
+ * 0-DRT_BITVECTOR_PAGES inclusive, as well as have one value
+ * to indicate that the bucket is actually unoccupied.
+ */
+#define DRT_HASH_GET_ADDRESS(scm, i) ((scm)->scm_hashtable[(i)].dhe_control & DRT_ADDRESS_MASK)
+#define DRT_HASH_SET_ADDRESS(scm, i, a) \
+ do { \
+ (scm)->scm_hashtable[(i)].dhe_control = \
+ ((scm)->scm_hashtable[(i)].dhe_control & ~DRT_ADDRESS_MASK) | DRT_ALIGN_ADDRESS(a); \
+ } while (0)
+#define DRT_HASH_COUNT_MASK 0x1ff
+#define DRT_HASH_GET_COUNT(scm, i) ((scm)->scm_hashtable[(i)].dhe_control & DRT_HASH_COUNT_MASK)
+#define DRT_HASH_SET_COUNT(scm, i, c) \
+ do { \
+ (scm)->scm_hashtable[(i)].dhe_control = \
+ ((scm)->scm_hashtable[(i)].dhe_control & ~DRT_HASH_COUNT_MASK) | ((c) & DRT_HASH_COUNT_MASK); \
+ } while (0)
+#define DRT_HASH_CLEAR(scm, i) \
+ do { \
+ (scm)->scm_hashtable[(i)].dhe_control = 0; \
+ } while (0)
+#define DRT_HASH_VACATE(scm, i) DRT_HASH_SET_COUNT((scm), (i), DRT_HASH_COUNT_MASK)
+#define DRT_HASH_VACANT(scm, i) (DRT_HASH_GET_COUNT((scm), (i)) == DRT_HASH_COUNT_MASK)
+#define DRT_HASH_COPY(oscm, oi, scm, i) \
+ do { \
+ (scm)->scm_hashtable[(i)].dhe_control = (oscm)->scm_hashtable[(oi)].dhe_control; \
+ DRT_BITVECTOR_COPY(oscm, oi, scm, i); \
+ } while(0);
+
+
+/*
+ * Hash table moduli.
+ *
+ * Since the hashtable entry's size is dependent on the size of
+ * the bitvector, and since the hashtable size is constrained to
+ * both being prime and fitting within the desired allocation
+ * size, these values need to be manually determined.
+ *
+ * For DRT_BITVECTOR_SIZE = 256, the entry size is 40 bytes.
+ *
+ * The small hashtable allocation is 1024 bytes, so the modulus is 23.
+ * The large hashtable allocation is 16384 bytes, so the modulus is 401.
+ */
+#define DRT_HASH_SMALL_MODULUS 23
+#define DRT_HASH_LARGE_MODULUS 401
+
+/*
+ * Physical memory required before the large hash modulus is permitted.
+ *
+ * On small memory systems, the large hash modulus can lead to phsyical
+ * memory starvation, so we avoid using it there.
+ */
+#define DRT_HASH_LARGE_MEMORY_REQUIRED (1024LL * 1024LL * 1024LL) /* 1GiB */
+
+#define DRT_SMALL_ALLOCATION 1024 /* 104 bytes spare */
+#define DRT_LARGE_ALLOCATION 16384 /* 344 bytes spare */
+
+/* *** nothing below here has secret dependencies on DRT_BITVECTOR_PAGES *** */
+
+/*
+ * Hashtable bitvector handling.
+ *
+ * Bitvector fields are 32 bits long.
+ */
+
+#define DRT_HASH_SET_BIT(scm, i, bit) \
+ (scm)->scm_hashtable[(i)].dhe_bitvector[(bit) / 32] |= (1 << ((bit) % 32))
+
+#define DRT_HASH_CLEAR_BIT(scm, i, bit) \
+ (scm)->scm_hashtable[(i)].dhe_bitvector[(bit) / 32] &= ~(1 << ((bit) % 32))
+
+#define DRT_HASH_TEST_BIT(scm, i, bit) \
+ ((scm)->scm_hashtable[(i)].dhe_bitvector[(bit) / 32] & (1 << ((bit) % 32)))
+
+#define DRT_BITVECTOR_CLEAR(scm, i) \
+ bzero(&(scm)->scm_hashtable[(i)].dhe_bitvector[0], (DRT_BITVECTOR_PAGES / 32) * sizeof(u_int32_t))
+
+#define DRT_BITVECTOR_COPY(oscm, oi, scm, i) \
+ bcopy(&(oscm)->scm_hashtable[(oi)].dhe_bitvector[0], \
+ &(scm)->scm_hashtable[(i)].dhe_bitvector[0], \
+ (DRT_BITVECTOR_PAGES / 32) * sizeof(u_int32_t))
+
+
+
+/*
+ * Hashtable entry.
+ */
+struct vfs_drt_hashentry {
+ u_int64_t dhe_control;
+/*
+* dhe_bitvector was declared as dhe_bitvector[DRT_BITVECTOR_PAGES / 32];
+* DRT_BITVECTOR_PAGES is defined as ((1024 * 1024) / PAGE_SIZE)
+* Since PAGE_SIZE is only known at boot time,
+* -define MAX_DRT_BITVECTOR_PAGES for smallest supported page size (4k)
+* -declare dhe_bitvector array for largest possible length
+*/
+#define MAX_DRT_BITVECTOR_PAGES (1024 * 1024)/( 4 * 1024)
+ u_int32_t dhe_bitvector[MAX_DRT_BITVECTOR_PAGES/32];
+};
+
+/*
+ * Dirty Region Tracking structure.
+ *
+ * The hashtable is allocated entirely inside the DRT structure.
+ *
+ * The hash is a simple circular prime modulus arrangement, the structure
+ * is resized from small to large if it overflows.
+ */
+
+struct vfs_drt_clustermap {
+ u_int32_t scm_magic; /* sanity/detection */
+#define DRT_SCM_MAGIC 0x12020003
+ u_int32_t scm_modulus; /* current ring size */
+ u_int32_t scm_buckets; /* number of occupied buckets */
+ u_int32_t scm_lastclean; /* last entry we cleaned */
+ u_int32_t scm_iskips; /* number of slot skips */
+
+ struct vfs_drt_hashentry scm_hashtable[0];
+};
+
+
+#define DRT_HASH(scm, addr) ((addr) % (scm)->scm_modulus)
+#define DRT_HASH_NEXT(scm, addr) (((addr) + 1) % (scm)->scm_modulus)
+
+/*
+ * Debugging codes and arguments.
+ */
+#define DRT_DEBUG_EMPTYFREE (FSDBG_CODE(DBG_FSRW, 82)) /* nil */
+#define DRT_DEBUG_RETCLUSTER (FSDBG_CODE(DBG_FSRW, 83)) /* offset, length */
+#define DRT_DEBUG_ALLOC (FSDBG_CODE(DBG_FSRW, 84)) /* copycount */
+#define DRT_DEBUG_INSERT (FSDBG_CODE(DBG_FSRW, 85)) /* offset, iskip */
+#define DRT_DEBUG_MARK (FSDBG_CODE(DBG_FSRW, 86)) /* offset, length,
+ * dirty */
+ /* 0, setcount */
+ /* 1 (clean, no map) */
+ /* 2 (map alloc fail) */
+ /* 3, resid (partial) */
+#define DRT_DEBUG_6 (FSDBG_CODE(DBG_FSRW, 87))
+#define DRT_DEBUG_SCMDATA (FSDBG_CODE(DBG_FSRW, 88)) /* modulus, buckets,
+ * lastclean, iskips */
+
+
+static kern_return_t vfs_drt_alloc_map(struct vfs_drt_clustermap **cmapp);
+static kern_return_t vfs_drt_free_map(struct vfs_drt_clustermap *cmap);
+static kern_return_t vfs_drt_search_index(struct vfs_drt_clustermap *cmap,
+ u_int64_t offset, int *indexp);
+static kern_return_t vfs_drt_get_index(struct vfs_drt_clustermap **cmapp,
+ u_int64_t offset,
+ int *indexp,
+ int recursed);
+static kern_return_t vfs_drt_do_mark_pages(
+ void **cmapp,
+ u_int64_t offset,
+ u_int length,
+ u_int *setcountp,
+ int dirty);
+static void vfs_drt_trace(
+ struct vfs_drt_clustermap *cmap,
+ int code,
+ int arg1,
+ int arg2,
+ int arg3,
+ int arg4);
+
+
+/*
+ * Allocate and initialise a sparse cluster map.
+ *
+ * Will allocate a new map, resize or compact an existing map.
+ *
+ * XXX we should probably have at least one intermediate map size,
+ * as the 1:16 ratio seems a bit drastic.
+ */
+static kern_return_t
+vfs_drt_alloc_map(struct vfs_drt_clustermap **cmapp)
+{
+ struct vfs_drt_clustermap *cmap, *ocmap;
+ kern_return_t kret;
+ u_int64_t offset;
+ u_int32_t i;
+ int nsize, active_buckets, index, copycount;
+
+ ocmap = NULL;
+ if (cmapp != NULL)
+ ocmap = *cmapp;
+
+ /*
+ * Decide on the size of the new map.
+ */
+ if (ocmap == NULL) {
+ nsize = DRT_HASH_SMALL_MODULUS;
+ } else {
+ /* count the number of active buckets in the old map */
+ active_buckets = 0;
+ for (i = 0; i < ocmap->scm_modulus; i++) {
+ if (!DRT_HASH_VACANT(ocmap, i) &&
+ (DRT_HASH_GET_COUNT(ocmap, i) != 0))
+ active_buckets++;
+ }
+ /*
+ * If we're currently using the small allocation, check to
+ * see whether we should grow to the large one.
+ */
+ if (ocmap->scm_modulus == DRT_HASH_SMALL_MODULUS) {
+ /*
+ * If the ring is nearly full and we are allowed to
+ * use the large modulus, upgrade.
+ */
+ if ((active_buckets > (DRT_HASH_SMALL_MODULUS - 5)) &&
+ (max_mem >= DRT_HASH_LARGE_MEMORY_REQUIRED)) {
+ nsize = DRT_HASH_LARGE_MODULUS;
+ } else {
+ nsize = DRT_HASH_SMALL_MODULUS;
+ }
+ } else {
+ /* already using the large modulus */
+ nsize = DRT_HASH_LARGE_MODULUS;
+ /*
+ * If the ring is completely full, there's
+ * nothing useful for us to do. Behave as
+ * though we had compacted into the new
+ * array and return.
+ */
+ if (active_buckets >= DRT_HASH_LARGE_MODULUS)
+ return(KERN_SUCCESS);
+ }
+ }
+
+ /*
+ * Allocate and initialise the new map.
+ */
+
+ kret = kmem_alloc(kernel_map, (vm_offset_t *)&cmap,
+ (nsize == DRT_HASH_SMALL_MODULUS) ? DRT_SMALL_ALLOCATION : DRT_LARGE_ALLOCATION, VM_KERN_MEMORY_FILE);
+ if (kret != KERN_SUCCESS)
+ return(kret);
+ cmap->scm_magic = DRT_SCM_MAGIC;
+ cmap->scm_modulus = nsize;
+ cmap->scm_buckets = 0;
+ cmap->scm_lastclean = 0;
+ cmap->scm_iskips = 0;
+ for (i = 0; i < cmap->scm_modulus; i++) {
+ DRT_HASH_CLEAR(cmap, i);
+ DRT_HASH_VACATE(cmap, i);
+ DRT_BITVECTOR_CLEAR(cmap, i);
+ }
+
+ /*
+ * If there's an old map, re-hash entries from it into the new map.
+ */
+ copycount = 0;
+ if (ocmap != NULL) {
+ for (i = 0; i < ocmap->scm_modulus; i++) {
+ /* skip empty buckets */
+ if (DRT_HASH_VACANT(ocmap, i) ||
+ (DRT_HASH_GET_COUNT(ocmap, i) == 0))
+ continue;
+ /* get new index */
+ offset = DRT_HASH_GET_ADDRESS(ocmap, i);
+ kret = vfs_drt_get_index(&cmap, offset, &index, 1);
+ if (kret != KERN_SUCCESS) {
+ /* XXX need to bail out gracefully here */
+ panic("vfs_drt: new cluster map mysteriously too small");
+ index = 0;
+ }
+ /* copy */
+ DRT_HASH_COPY(ocmap, i, cmap, index);
+ copycount++;
+ }
+ }
+
+ /* log what we've done */
+ vfs_drt_trace(cmap, DRT_DEBUG_ALLOC, copycount, 0, 0, 0);
+
+ /*
+ * It's important to ensure that *cmapp always points to
+ * a valid map, so we must overwrite it before freeing
+ * the old map.
+ */
+ *cmapp = cmap;
+ if (ocmap != NULL) {
+ /* emit stats into trace buffer */
+ vfs_drt_trace(ocmap, DRT_DEBUG_SCMDATA,
+ ocmap->scm_modulus,
+ ocmap->scm_buckets,
+ ocmap->scm_lastclean,
+ ocmap->scm_iskips);
+
+ vfs_drt_free_map(ocmap);
+ }
+ return(KERN_SUCCESS);
+}
+
+
+/*
+ * Free a sparse cluster map.
+ */
+static kern_return_t
+vfs_drt_free_map(struct vfs_drt_clustermap *cmap)
+{
+ kmem_free(kernel_map, (vm_offset_t)cmap,
+ (cmap->scm_modulus == DRT_HASH_SMALL_MODULUS) ? DRT_SMALL_ALLOCATION : DRT_LARGE_ALLOCATION);
+ return(KERN_SUCCESS);
+}
+
+
+/*
+ * Find the hashtable slot currently occupied by an entry for the supplied offset.
+ */
+static kern_return_t
+vfs_drt_search_index(struct vfs_drt_clustermap *cmap, u_int64_t offset, int *indexp)
+{
+ int index;
+ u_int32_t i;
+
+ offset = DRT_ALIGN_ADDRESS(offset);
+ index = DRT_HASH(cmap, offset);
+
+ /* traverse the hashtable */
+ for (i = 0; i < cmap->scm_modulus; i++) {
+
+ /*
+ * If the slot is vacant, we can stop.
+ */
+ if (DRT_HASH_VACANT(cmap, index))
+ break;
+
+ /*
+ * If the address matches our offset, we have success.
+ */
+ if (DRT_HASH_GET_ADDRESS(cmap, index) == offset) {
+ *indexp = index;
+ return(KERN_SUCCESS);
+ }
+
+ /*
+ * Move to the next slot, try again.
+ */
+ index = DRT_HASH_NEXT(cmap, index);
+ }
+ /*
+ * It's not there.
+ */
+ return(KERN_FAILURE);
+}
+
+/*
+ * Find the hashtable slot for the supplied offset. If we haven't allocated
+ * one yet, allocate one and populate the address field. Note that it will
+ * not have a nonzero page count and thus will still technically be free, so
+ * in the case where we are called to clean pages, the slot will remain free.
+ */
+static kern_return_t
+vfs_drt_get_index(struct vfs_drt_clustermap **cmapp, u_int64_t offset, int *indexp, int recursed)
+{
+ struct vfs_drt_clustermap *cmap;
+ kern_return_t kret;
+ u_int32_t index;
+ u_int32_t i;
+
+ cmap = *cmapp;
+
+ /* look for an existing entry */
+ kret = vfs_drt_search_index(cmap, offset, indexp);
+ if (kret == KERN_SUCCESS)
+ return(kret);
+
+ /* need to allocate an entry */
+ offset = DRT_ALIGN_ADDRESS(offset);
+ index = DRT_HASH(cmap, offset);
+
+ /* scan from the index forwards looking for a vacant slot */
+ for (i = 0; i < cmap->scm_modulus; i++) {
+ /* slot vacant? */
+ if (DRT_HASH_VACANT(cmap, index) || DRT_HASH_GET_COUNT(cmap,index) == 0) {
+ cmap->scm_buckets++;
+ if (index < cmap->scm_lastclean)
+ cmap->scm_lastclean = index;
+ DRT_HASH_SET_ADDRESS(cmap, index, offset);
+ DRT_HASH_SET_COUNT(cmap, index, 0);
+ DRT_BITVECTOR_CLEAR(cmap, index);
+ *indexp = index;
+ vfs_drt_trace(cmap, DRT_DEBUG_INSERT, (int)offset, i, 0, 0);
+ return(KERN_SUCCESS);
+ }
+ cmap->scm_iskips += i;
+ index = DRT_HASH_NEXT(cmap, index);
+ }
+
+ /*
+ * We haven't found a vacant slot, so the map is full. If we're not
+ * already recursed, try reallocating/compacting it.
+ */
+ if (recursed)
+ return(KERN_FAILURE);
+ kret = vfs_drt_alloc_map(cmapp);
+ if (kret == KERN_SUCCESS) {
+ /* now try to insert again */
+ kret = vfs_drt_get_index(cmapp, offset, indexp, 1);
+ }
+ return(kret);
+}
+
+/*
+ * Implementation of set dirty/clean.
+ *
+ * In the 'clean' case, not finding a map is OK.
+ */
+static kern_return_t
+vfs_drt_do_mark_pages(
+ void **private,
+ u_int64_t offset,
+ u_int length,
+ u_int *setcountp,
+ int dirty)
+{
+ struct vfs_drt_clustermap *cmap, **cmapp;
+ kern_return_t kret;
+ int i, index, pgoff, pgcount, setcount, ecount;
+
+ cmapp = (struct vfs_drt_clustermap **)private;
+ cmap = *cmapp;
+
+ vfs_drt_trace(cmap, DRT_DEBUG_MARK | DBG_FUNC_START, (int)offset, (int)length, dirty, 0);
+
+ if (setcountp != NULL)
+ *setcountp = 0;
+
+ /* allocate a cluster map if we don't already have one */
+ if (cmap == NULL) {
+ /* no cluster map, nothing to clean */
+ if (!dirty) {
+ vfs_drt_trace(cmap, DRT_DEBUG_MARK | DBG_FUNC_END, 1, 0, 0, 0);
+ return(KERN_SUCCESS);
+ }
+ kret = vfs_drt_alloc_map(cmapp);
+ if (kret != KERN_SUCCESS) {
+ vfs_drt_trace(cmap, DRT_DEBUG_MARK | DBG_FUNC_END, 2, 0, 0, 0);
+ return(kret);
+ }
+ }
+ setcount = 0;
+
+ /*
+ * Iterate over the length of the region.
+ */
+ while (length > 0) {
+ /*
+ * Get the hashtable index for this offset.
+ *
+ * XXX this will add blank entries if we are clearing a range
+ * that hasn't been dirtied.
+ */
+ kret = vfs_drt_get_index(cmapp, offset, &index, 0);
+ cmap = *cmapp; /* may have changed! */
+ /* this may be a partial-success return */
+ if (kret != KERN_SUCCESS) {
+ if (setcountp != NULL)
+ *setcountp = setcount;
+ vfs_drt_trace(cmap, DRT_DEBUG_MARK | DBG_FUNC_END, 3, (int)length, 0, 0);
+
+ return(kret);
+ }
+
+ /*
+ * Work out how many pages we're modifying in this
+ * hashtable entry.
+ */
+ pgoff = (offset - DRT_ALIGN_ADDRESS(offset)) / PAGE_SIZE;
+ pgcount = min((length / PAGE_SIZE), (DRT_BITVECTOR_PAGES - pgoff));
+
+ /*
+ * Iterate over pages, dirty/clearing as we go.
+ */
+ ecount = DRT_HASH_GET_COUNT(cmap, index);
+ for (i = 0; i < pgcount; i++) {
+ if (dirty) {
+ if (!DRT_HASH_TEST_BIT(cmap, index, pgoff + i)) {
+ DRT_HASH_SET_BIT(cmap, index, pgoff + i);
+ ecount++;
+ setcount++;
+ }
+ } else {
+ if (DRT_HASH_TEST_BIT(cmap, index, pgoff + i)) {
+ DRT_HASH_CLEAR_BIT(cmap, index, pgoff + i);
+ ecount--;
+ setcount++;
+ }
+ }
+ }
+ DRT_HASH_SET_COUNT(cmap, index, ecount);
+
+ offset += pgcount * PAGE_SIZE;
+ length -= pgcount * PAGE_SIZE;
+ }
+ if (setcountp != NULL)
+ *setcountp = setcount;
+
+ vfs_drt_trace(cmap, DRT_DEBUG_MARK | DBG_FUNC_END, 0, setcount, 0, 0);
+
+ return(KERN_SUCCESS);
+}
+
+/*
+ * Mark a set of pages as dirty/clean.
+ *
+ * This is a public interface.
+ *
+ * cmapp
+ * Pointer to storage suitable for holding a pointer. Note that
+ * this must either be NULL or a value set by this function.
+ *
+ * size
+ * Current file size in bytes.
+ *
+ * offset
+ * Offset of the first page to be marked as dirty, in bytes. Must be
+ * page-aligned.
+ *
+ * length
+ * Length of dirty region, in bytes. Must be a multiple of PAGE_SIZE.
+ *
+ * setcountp
+ * Number of pages newly marked dirty by this call (optional).
+ *
+ * Returns KERN_SUCCESS if all the pages were successfully marked.
+ */
+static kern_return_t
+vfs_drt_mark_pages(void **cmapp, off_t offset, u_int length, u_int *setcountp)
+{
+ /* XXX size unused, drop from interface */
+ return(vfs_drt_do_mark_pages(cmapp, offset, length, setcountp, 1));
+}
+
+#if 0
+static kern_return_t
+vfs_drt_unmark_pages(void **cmapp, off_t offset, u_int length)
+{
+ return(vfs_drt_do_mark_pages(cmapp, offset, length, NULL, 0));
+}
+#endif
+
+/*
+ * Get a cluster of dirty pages.
+ *
+ * This is a public interface.
+ *
+ * cmapp
+ * Pointer to storage managed by drt_mark_pages. Note that this must
+ * be NULL or a value set by drt_mark_pages.
+ *
+ * offsetp
+ * Returns the byte offset into the file of the first page in the cluster.
+ *
+ * lengthp
+ * Returns the length in bytes of the cluster of dirty pages.
+ *
+ * Returns success if a cluster was found. If KERN_FAILURE is returned, there
+ * are no dirty pages meeting the minmum size criteria. Private storage will
+ * be released if there are no more dirty pages left in the map
+ *
+ */
+static kern_return_t
+vfs_drt_get_cluster(void **cmapp, off_t *offsetp, u_int *lengthp)
+{
+ struct vfs_drt_clustermap *cmap;
+ u_int64_t offset;
+ u_int length;
+ u_int32_t j;
+ int index, i, fs, ls;
+
+ /* sanity */
+ if ((cmapp == NULL) || (*cmapp == NULL))
+ return(KERN_FAILURE);
+ cmap = *cmapp;
+
+ /* walk the hashtable */
+ for (offset = 0, j = 0; j < cmap->scm_modulus; offset += (DRT_BITVECTOR_PAGES * PAGE_SIZE), j++) {
+ index = DRT_HASH(cmap, offset);
+
+ if (DRT_HASH_VACANT(cmap, index) || (DRT_HASH_GET_COUNT(cmap, index) == 0))
+ continue;
+
+ /* scan the bitfield for a string of bits */
+ fs = -1;
+
+ for (i = 0; i < DRT_BITVECTOR_PAGES; i++) {
+ if (DRT_HASH_TEST_BIT(cmap, index, i)) {
+ fs = i;
+ break;
+ }
+ }
+ if (fs == -1) {
+ /* didn't find any bits set */
+ panic("vfs_drt: entry summary count > 0 but no bits set in map");
+ }
+ for (ls = 0; i < DRT_BITVECTOR_PAGES; i++, ls++) {
+ if (!DRT_HASH_TEST_BIT(cmap, index, i))
+ break;
+ }
+
+ /* compute offset and length, mark pages clean */
+ offset = DRT_HASH_GET_ADDRESS(cmap, index) + (PAGE_SIZE * fs);
+ length = ls * PAGE_SIZE;
+ vfs_drt_do_mark_pages(cmapp, offset, length, NULL, 0);
+ cmap->scm_lastclean = index;
+
+ /* return successful */
+ *offsetp = (off_t)offset;
+ *lengthp = length;
+
+ vfs_drt_trace(cmap, DRT_DEBUG_RETCLUSTER, (int)offset, (int)length, 0, 0);
+ return(KERN_SUCCESS);
+ }
+ /*
+ * We didn't find anything... hashtable is empty
+ * emit stats into trace buffer and
+ * then free it
+ */
+ vfs_drt_trace(cmap, DRT_DEBUG_SCMDATA,
+ cmap->scm_modulus,
+ cmap->scm_buckets,
+ cmap->scm_lastclean,
+ cmap->scm_iskips);
+
+ vfs_drt_free_map(cmap);
+ *cmapp = NULL;
+
+ return(KERN_FAILURE);
+}
+
+
+static kern_return_t
+vfs_drt_control(void **cmapp, int op_type)
+{
+ struct vfs_drt_clustermap *cmap;
+
+ /* sanity */
+ if ((cmapp == NULL) || (*cmapp == NULL))
+ return(KERN_FAILURE);
+ cmap = *cmapp;
+
+ switch (op_type) {
+ case 0:
+ /* emit stats into trace buffer */
+ vfs_drt_trace(cmap, DRT_DEBUG_SCMDATA,
+ cmap->scm_modulus,
+ cmap->scm_buckets,
+ cmap->scm_lastclean,
+ cmap->scm_iskips);
+
+ vfs_drt_free_map(cmap);
+ *cmapp = NULL;
+ break;
+
+ case 1:
+ cmap->scm_lastclean = 0;
+ break;
}
- return(1);
+ return(KERN_SUCCESS);
+}
+
+
+
+/*
+ * Emit a summary of the state of the clustermap into the trace buffer
+ * along with some caller-provided data.
+ */
+#if KDEBUG
+static void
+vfs_drt_trace(__unused struct vfs_drt_clustermap *cmap, int code, int arg1, int arg2, int arg3, int arg4)
+{
+ KERNEL_DEBUG(code, arg1, arg2, arg3, arg4, 0);
+}
+#else
+static void
+vfs_drt_trace(__unused struct vfs_drt_clustermap *cmap, __unused int code,
+ __unused int arg1, __unused int arg2, __unused int arg3,
+ __unused int arg4)
+{
+}
+#endif
+
+#if 0
+/*
+ * Perform basic sanity check on the hash entry summary count
+ * vs. the actual bits set in the entry.
+ */
+static void
+vfs_drt_sanity(struct vfs_drt_clustermap *cmap)
+{
+ int index, i;
+ int bits_on;
+
+ for (index = 0; index < cmap->scm_modulus; index++) {
+ if (DRT_HASH_VACANT(cmap, index))
+ continue;
+
+ for (bits_on = 0, i = 0; i < DRT_BITVECTOR_PAGES; i++) {
+ if (DRT_HASH_TEST_BIT(cmap, index, i))
+ bits_on++;
+ }
+ if (bits_on != DRT_HASH_GET_COUNT(cmap, index))
+ panic("bits_on = %d, index = %d\n", bits_on, index);
+ }
}
+#endif