/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#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_internal.h>
+#include <vm/vnode_pager.h>
#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 <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <vm/vm_pageout.h>
#include <sys/kdebug.h>
+#include <libkern/OSAtomic.h>
+#include <sys/sdt.h>
-#define CL_READ 0x01
-#define CL_ASYNC 0x02
-#define CL_COMMIT 0x04
-#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
-#define CL_PRESERVE 0x400
-#define CL_THROTTLE 0x800
-#define CL_KEEPCACHED 0x1000
+#if 0
+#undef KERNEL_DEBUG
+#define KERNEL_DEBUG KERNEL_DEBUG_CONSTANT
+#endif
+#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
+
+#define MAX_VECTOR_UPL_ELEMENTS 8
+#define MAX_VECTOR_UPL_SIZE (2 * MAX_UPL_SIZE) * PAGE_SIZE
+
+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);
+
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 */
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_mtxp;
+static lck_mtx_t *cl_transaction_mtxp;
+
+
+#define IO_UNKNOWN 0
+#define IO_DIRECT 1
+#define IO_CONTIG 2
+#define IO_COPY 3
+
+#define PUSH_DELAY 0x01
+#define PUSH_ALL 0x02
+#define PUSH_SYNC 0x04
+
+
+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);
+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);
-static int cluster_iodone(buf_t bp, void *dummy);
-static int cluster_rd_prefetch(vnode_t vp, off_t f_offset, u_int size, off_t filesize);
-static int cluster_hard_throttle_on(vnode_t vp);
+ 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);
+static int cluster_hard_throttle_on(vnode_t vp, uint32_t);
-static int cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags);
-static int cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF,
- off_t headOff, off_t tailOff, int flags);
-static int cluster_nocopy_read(vnode_t vp, struct uio *uio, off_t filesize);
-static int cluster_nocopy_write(vnode_t vp, struct uio *uio, off_t newEOF);
-static int cluster_phys_read(vnode_t vp, struct uio *uio, off_t filesize);
-static int cluster_phys_write(vnode_t vp, struct uio *uio, off_t newEOF);
-static int cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, int xsize, int flags);
+static void cluster_iostate_wait(struct clios *iostate, u_int target, const char *wait_name);
-static void cluster_rd_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl_readahead *ra);
+static void cluster_syncup(vnode_t vp, off_t newEOF, int (*)(buf_t, void *), void *callback_arg);
-static int cluster_push_x(vnode_t vp, struct cl_extent *, off_t EOF, int flags);
-static void cluster_push_EOF(vnode_t vp, off_t EOF);
+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);
-static int cluster_try_push(struct cl_writebehind *, vnode_t vp, off_t EOF, int can_delay, int push_all);
+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);
-static void sparse_cluster_switch(struct cl_writebehind *, vnode_t vp, off_t EOF);
-static void sparse_cluster_push(struct cl_writebehind *, vnode_t vp, off_t EOF, int push_all);
-static void sparse_cluster_add(struct cl_writebehind *, vnode_t vp, struct cl_extent *, off_t EOF);
+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 kern_return_t vfs_drt_mark_pages(void **cmapp, off_t offset, u_int length, int *setcountp);
+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);
+
+static int cluster_push_now(vnode_t vp, struct cl_extent *, off_t EOF, int flags, int (*)(buf_t, void *), void *callback_arg);
+
+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);
+
+static void sparse_cluster_switch(struct cl_writebehind *, vnode_t vp, off_t EOF, int (*)(buf_t, void *), void *callback_arg);
+static void 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);
+
+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);
-int is_file_clean(vnode_t, off_t);
+
+/*
+ * 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;
+
+
+/*
+ * 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 * PAGE_SIZE)
+#define MAX_VECTS 16
+#define MIN_DIRECT_WRITE_SIZE (4 * PAGE_SIZE)
+
+#define WRITE_THROTTLE 6
+#define WRITE_THROTTLE_SSD 2
+#define WRITE_BEHIND 1
+#define WRITE_BEHIND_SSD 1
+
+#if CONFIG_EMBEDDED
+#define PREFETCH 1
+#define PREFETCH_SSD 1
+uint32_t speculative_prefetch_max = 512; /* maximum number of pages to use for a specluative read-ahead */
+uint32_t speculative_prefetch_max_iosize = (512 * 1024); /* maximum I/O size to use for a specluative read-ahead */
+#else
+#define PREFETCH 3
+#define PREFETCH_SSD 1
+uint32_t speculative_prefetch_max = (MAX_UPL_SIZE * 3);
+uint32_t speculative_prefetch_max_iosize = (512 * 1024); /* maximum I/O size to use for a specluative read-ahead on SSDs*/
+#endif
+
+
+#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)))
+
+int ignore_is_ssd = 0;
+int speculative_reads_disabled = 0;
/*
* throttle the number of async writes that
* before we issue a synchronous write
*/
#define HARD_THROTTLE_MAXCNT 0
-#define HARD_THROTTLE_MAXSIZE (64 * 1024)
+#define HARD_THROTTLE_MAX_IOSIZE (128 * 1024)
+#define LEGACY_HARD_THROTTLE_MAX_IOSIZE (512 * 1024)
+extern int32_t throttle_legacy_process_count;
int hard_throttle_on_root = 0;
+uint32_t hard_throttle_max_iosize = HARD_THROTTLE_MAX_IOSIZE;
+uint32_t legacy_hard_throttle_max_iosize = LEGACY_HARD_THROTTLE_MAX_IOSIZE;
struct timeval priority_IO_timestamp_for_root;
+#if CONFIG_EMBEDDED
+#define THROTTLE_MAX_IOSIZE (hard_throttle_max_iosize)
+#else
+#define THROTTLE_MAX_IOSIZE (throttle_legacy_process_count == 0 ? hard_throttle_max_iosize : legacy_hard_throttle_max_iosize)
+#endif
+
+
+SYSCTL_INT(_debug, OID_AUTO, lowpri_throttle_max_iosize, CTLFLAG_RW | CTLFLAG_LOCKED, &hard_throttle_max_iosize, 0, "");
+SYSCTL_INT(_debug, OID_AUTO, lowpri_legacy_throttle_max_iosize, CTLFLAG_RW | CTLFLAG_LOCKED, &legacy_hard_throttle_max_iosize, 0, "");
+
void
cluster_init(void) {
- /*
+ /*
* allocate lock group attribute and group
*/
- cl_mtx_grp_attr = lck_grp_attr_alloc_init();
+ cl_mtx_grp_attr = lck_grp_attr_alloc_init();
cl_mtx_grp = lck_grp_alloc_init("cluster I/O", cl_mtx_grp_attr);
/*
*/
cl_mtx_attr = lck_attr_alloc_init();
- /*
- * allocate and initialize mutex's used to protect updates and waits
- * on the cluster_io context
- */
- cl_mtxp = lck_mtx_alloc_init(cl_mtx_grp, cl_mtx_attr);
+ cl_transaction_mtxp = lck_mtx_alloc_init(cl_mtx_grp, cl_mtx_attr);
+
+ if (cl_transaction_mtxp == NULL)
+ panic("cluster_init: failed to allocate cl_transaction_mtxp");
+}
+
+
+uint32_t
+cluster_max_io_size(mount_t mp, int type)
+{
+ uint32_t max_io_size;
+ uint32_t segcnt;
+ uint32_t maxcnt;
+
+ switch(type) {
+
+ 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) {
+ /*
+ * don't allow a size beyond the max UPL size we can create
+ */
+ segcnt = MAX_UPL_SIZE;
+ }
+ max_io_size = min((segcnt * PAGE_SIZE), maxcnt);
- if (cl_mtxp == NULL)
- panic("cluster_init: failed to allocate cl_mtxp");
+ if (max_io_size < (MAX_UPL_TRANSFER * PAGE_SIZE)) {
+ /*
+ * don't allow a size smaller than the old fixed limit
+ */
+ max_io_size = (MAX_UPL_TRANSFER * PAGE_SIZE);
+ } else {
+ /*
+ * make sure the size specified is a multiple of PAGE_SIZE
+ */
+ max_io_size &= ~PAGE_MASK;
+ }
+ return (max_io_size);
}
+
#define CLW_ALLOCATE 0x01
#define CLW_RETURNLOCKED 0x02
+#define CLW_IONOCACHE 0x04
+#define CLW_IOPASSIVE 0x08
+
/*
* if the read ahead context doesn't yet exist,
* allocate and initialize it...
else {
lck_mtx_destroy(&rap->cl_lockr, cl_mtx_grp);
FREE_ZONE((void *)rap, sizeof *rap, M_CLRDAHEAD);
- rap = ubc->cl_rahead;
+ rap = ubc->cl_rahead;
}
vnode_unlock(vp);
}
else {
lck_mtx_destroy(&wbp->cl_lockw, cl_mtx_grp);
FREE_ZONE((void *)wbp, sizeof *wbp, M_CLWRBEHIND);
- wbp = ubc->cl_wbehind;
+ wbp = ubc->cl_wbehind;
}
vnode_unlock(vp);
}
}
+static void
+cluster_syncup(vnode_t vp, off_t newEOF, int (*callback)(buf_t, void *), void *callback_arg)
+{
+ struct cl_writebehind *wbp;
+
+ if ((wbp = cluster_get_wbp(vp, 0)) != NULL) {
+
+ if (wbp->cl_number) {
+ lck_mtx_lock(&wbp->cl_lockw);
+
+ cluster_try_push(wbp, vp, newEOF, PUSH_ALL | PUSH_SYNC, 0, callback, callback_arg);
+
+ lck_mtx_unlock(&wbp->cl_lockw);
+ }
+ }
+}
+
+
+static int
+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);
+
+ if (io_size == 0)
+ return (0);
+
+ if (bootcache_check_fn(vp->v_mount->mnt_devvp->v_rdev, blkno))
+ return(1);
+ }
+ return(0);
+}
+
+
static int
-cluster_hard_throttle_on(vnode_t vp)
+cluster_hard_throttle_on(vnode_t vp, uint32_t hard_throttle)
{
- static struct timeval hard_throttle_maxelapsed = { 0, 200000 };
+ int throttle_type = 0;
+
+ if ( (throttle_type = throttle_io_will_be_throttled(-1, vp->v_mount)) )
+ return(throttle_type);
- if (vp->v_mount->mnt_kern_flag & MNTK_ROOTDEV) {
- struct timeval elapsed;
+ if (hard_throttle && (vp->v_mount->mnt_kern_flag & MNTK_ROOTDEV)) {
+ static struct timeval hard_throttle_maxelapsed = { 0, 100000 };
+ struct timeval elapsed;
if (hard_throttle_on_root)
- return(1);
+ return(1);
microuptime(&elapsed);
timevalsub(&elapsed, &priority_IO_timestamp_for_root);
if (timevalcmp(&elapsed, &hard_throttle_maxelapsed, <))
- return(1);
+ return(1);
}
return(0);
}
+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 int
+cluster_ioerror(upl_t upl, int upl_offset, int abort_size, int error, int io_flags)
+{
+ int upl_abort_code = 0;
+ int page_in = 0;
+ int page_out = 0;
+
+ 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))
+ /*
+ * 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;
+
+ ubc_upl_abort_range(upl, upl_offset, abort_size, upl_abort_code);
+ }
+ return (upl_abort_code);
+}
+
+
static int
-cluster_iodone(buf_t bp, __unused void *dummy)
+cluster_iodone(buf_t bp, void *callback_arg)
{
int b_flags;
int error;
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;
struct clios *iostate;
- int commit_size;
- int pg_offset;
+ boolean_t transaction_complete = FALSE;
cbp_head = (buf_t)(bp->b_trans_head);
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_START,
- (int)cbp_head, bp->b_lblkno, bp->b_bcount, bp->b_flags, 0);
+ cbp_head, bp->b_lblkno, bp->b_bcount, bp->b_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_DONE)) {
+ if (cbp_head->b_trans_next || !(cbp_head->b_flags & B_EOT)) {
+ boolean_t need_wakeup = FALSE;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
- (int)cbp_head, (int)cbp, cbp->b_bcount, cbp->b_flags, 0);
+ lck_mtx_lock_spin(cl_transaction_mtxp);
- return 0;
+ bp->b_flags |= B_TDONE;
+
+ if (bp->b_flags & B_TWANTED) {
+ CLR(bp->b_flags, B_TWANTED);
+ need_wakeup = TRUE;
+ }
+ 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)) {
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
+ cbp_head, cbp, cbp->b_bcount, cbp->b_flags, 0);
+
+ lck_mtx_unlock(cl_transaction_mtxp);
+
+ if (need_wakeup == TRUE)
+ wakeup(bp);
+
+ return 0;
+ }
+ if (cbp->b_flags & B_EOT)
+ transaction_complete = TRUE;
+ }
+ lck_mtx_unlock(cl_transaction_mtxp);
+
+ if (need_wakeup == TRUE)
+ wakeup(bp);
+
+ if (transaction_complete == FALSE) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
+ cbp_head, 0, 0, 0, 0);
+ return 0;
}
}
error = 0;
cbp_next = cbp->b_trans_next;
- free_io_buf(cbp);
+ 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;
+
+ if (cbp != cbp_head)
+ free_io_buf(cbp);
cbp = cbp_next;
}
+ if (error == 0 && total_resid)
+ error = EIO;
+
+ if (error == 0) {
+ int (*cliodone_func)(buf_t, void *) = (int (*)(buf_t, void *))(cbp_head->b_cliodone);
+
+ if (cliodone_func != NULL) {
+ cbp_head->b_bcount = transaction_size;
+
+ error = (*cliodone_func)(cbp_head, callback_arg);
+ }
+ }
if (zero_offset)
cluster_zero(upl, zero_offset, PAGE_SIZE - (zero_offset & PAGE_MASK), real_bp);
+ free_io_buf(cbp_head);
+
if (iostate) {
int need_wakeup = 0;
* someone has issued multiple I/Os asynchrounsly
* and is waiting for them to complete (streaming)
*/
- lck_mtx_lock(cl_mtxp);
+ lck_mtx_lock_spin(&iostate->io_mtxp);
if (error && iostate->io_error == 0)
iostate->io_error = error;
iostate->io_wanted = 0;
need_wakeup = 1;
}
- lck_mtx_unlock(cl_mtxp);
+ lck_mtx_unlock(&iostate->io_mtxp);
if (need_wakeup)
wakeup((caddr_t)&iostate->io_wanted);
}
- 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;
-
- buf_biodone(real_bp);
- }
- if (error == 0 && total_resid)
- error = EIO;
if (b_flags & B_COMMIT_UPL) {
- pg_offset = upl_offset & PAGE_MASK;
- commit_size = (pg_offset + total_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
-
- if (error || (b_flags & B_NOCACHE)) {
- int upl_abort_code;
- int page_in = 0;
- int page_out = 0;
-
- if (b_flags & B_PAGEIO) {
- if (b_flags & B_READ)
- page_in = 1;
- else
- page_out = 1;
- }
- if (b_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)) /* transient error */
- 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;
- ubc_upl_abort_range(upl, upl_offset - pg_offset, commit_size,
- upl_abort_code);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
- (int)upl, upl_offset - pg_offset, commit_size,
- 0x80000000|upl_abort_code, 0);
+ pg_offset = upl_offset & PAGE_MASK;
+ commit_size = (pg_offset + transaction_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
- } else {
- int upl_commit_flags = UPL_COMMIT_FREE_ON_EMPTY;
+ if (error)
+ upl_flags = cluster_ioerror(upl, upl_offset - pg_offset, commit_size, error, b_flags);
+ else {
+ upl_flags = UPL_COMMIT_FREE_ON_EMPTY;
if ((b_flags & B_PHYS) && (b_flags & B_READ))
- upl_commit_flags |= UPL_COMMIT_SET_DIRTY;
+ upl_flags |= UPL_COMMIT_SET_DIRTY;
if (b_flags & B_AGE)
- upl_commit_flags |= UPL_COMMIT_INACTIVATE;
+ upl_flags |= UPL_COMMIT_INACTIVATE;
- ubc_upl_commit_range(upl, upl_offset - pg_offset, commit_size,
- upl_commit_flags);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
- (int)upl, upl_offset - pg_offset, commit_size,
- upl_commit_flags, 0);
+ ubc_upl_commit_range(upl, upl_offset - pg_offset, commit_size, upl_flags);
}
- } else {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END,
- (int)upl, upl_offset, 0, error, 0);
}
+ if (real_bp) {
+ if (error) {
+ real_bp->b_flags |= B_ERROR;
+ real_bp->b_error = error;
+ }
+ real_bp->b_resid = total_resid;
+
+ 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);
}
+uint32_t
+cluster_hard_throttle_limit(vnode_t vp, uint32_t *limit, uint32_t hard_throttle)
+{
+ if (cluster_hard_throttle_on(vp, hard_throttle)) {
+ *limit = THROTTLE_MAX_IOSIZE;
+ return 1;
+ }
+ return 0;
+}
+
+
void
-cluster_zero(upl_t upl, vm_offset_t upl_offset, int size, buf_t bp)
+cluster_zero(upl_t upl, upl_offset_t upl_offset, int size, buf_t bp)
{
- upl_page_info_t *pl;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 23)) | DBG_FUNC_START,
- upl_offset, size, (int)bp, 0, 0);
+ upl_offset, size, bp, 0, 0);
if (bp == NULL || bp->b_datap == 0) {
+ upl_page_info_t *pl;
+ addr64_t zero_addr;
pl = ubc_upl_pageinfo(upl);
- while (size) {
- int page_offset;
- int page_index;
- addr64_t zero_addr;
- int zero_cnt;
+ if (upl_device_page(pl) == TRUE) {
+ zero_addr = ((addr64_t)upl_phys_page(pl, 0) << 12) + upl_offset;
+
+ bzero_phys_nc(zero_addr, size);
+ } else {
+ while (size) {
+ int page_offset;
+ int page_index;
+ int zero_cnt;
- page_index = upl_offset / PAGE_SIZE;
- page_offset = upl_offset & PAGE_MASK;
+ page_index = upl_offset / PAGE_SIZE;
+ page_offset = upl_offset & PAGE_MASK;
- zero_addr = ((addr64_t)upl_phys_page(pl, page_index) << 12) + page_offset;
- zero_cnt = min(PAGE_SIZE - page_offset, size);
+ zero_addr = ((addr64_t)upl_phys_page(pl, page_index) << 12) + page_offset;
+ zero_cnt = min(PAGE_SIZE - page_offset, size);
- bzero_phys(zero_addr, zero_cnt);
+ bzero_phys(zero_addr, zero_cnt);
- size -= zero_cnt;
- upl_offset += zero_cnt;
+ size -= zero_cnt;
+ upl_offset += zero_cnt;
+ }
}
} else
bzero((caddr_t)((vm_offset_t)bp->b_datap + upl_offset), size);
}
+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;
+}
+
+static void
+cluster_wait_IO(buf_t cbp_head, int async)
+{
+ buf_t cbp;
+
+ if (async) {
+ /*
+ * async callback completion will not normally
+ * generate a wakeup upon I/O completion...
+ * by setting B_TWANTED, we will force a wakeup
+ * to occur as any outstanding I/Os complete...
+ * I/Os already completed will have B_TDONE already
+ * set and we won't cause us to block
+ * note that we're actually waiting for the bp to have
+ * completed the callback function... only then
+ * can we safely take back ownership of the bp
+ */
+ lck_mtx_lock_spin(cl_transaction_mtxp);
+
+ for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next)
+ cbp->b_flags |= B_TWANTED;
+
+ lck_mtx_unlock(cl_transaction_mtxp);
+ }
+ for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next) {
+
+ if (async) {
+ while (!ISSET(cbp->b_flags, B_TDONE)) {
+
+ lck_mtx_lock_spin(cl_transaction_mtxp);
+
+ if (!ISSET(cbp->b_flags, B_TDONE)) {
+ DTRACE_IO1(wait__start, buf_t, cbp);
+ (void) msleep(cbp, cl_transaction_mtxp, PDROP | (PRIBIO+1), "cluster_wait_IO", NULL);
+ DTRACE_IO1(wait__done, buf_t, cbp);
+ } else
+ lck_mtx_unlock(cl_transaction_mtxp);
+ }
+ } else
+ buf_biowait(cbp);
+ }
+}
+
+static void
+cluster_complete_transaction(buf_t *cbp_head, void *callback_arg, int *retval, int flags, int needwait)
+{
+ buf_t cbp;
+ int error;
+
+ /*
+ * 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;
+
+ error = cluster_iodone(*cbp_head, callback_arg);
+
+ if ( !(flags & CL_ASYNC) && error && *retval == 0) {
+ if (((flags & (CL_PAGEOUT | CL_KEEPCACHED)) != CL_PAGEOUT) || (error != ENXIO))
+ *retval = error;
+ }
+ *cbp_head = (buf_t)NULL;
+}
+
+
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 flags, buf_t real_bp, struct clios *iostate, int (*callback)(buf_t, void *), void *callback_arg)
{
buf_t cbp;
u_int size;
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;
int zero_offset = 0;
int async_throttle = 0;
mount_t mp;
+ vm_offset_t upl_end_offset;
+ boolean_t need_EOT = FALSE;
+
+ /*
+ * we currently don't support buffers larger than a page
+ */
+ 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;
- if (mp->mnt_devblocksize > 1) {
+ /*
+ * 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
*/
size = non_rounded_size;
}
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_START,
- (int)f_offset, size, upl_offset, flags, 0);
+ upl_end_offset = upl_offset + size;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_START, (int)f_offset, size, upl_offset, flags, 0);
+
+ /*
+ * 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 (flags & CL_READ) {
- io_flags = (B_READ);
+ io_flags = B_READ;
bmap_flags = VNODE_READ;
max_iosize = mp->mnt_maxreadcnt;
max_vectors = mp->mnt_segreadcnt;
} else {
- io_flags = 0;
+ io_flags = B_WRITE;
bmap_flags = VNODE_WRITE;
max_iosize = mp->mnt_maxwritecnt;
*/
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_hard_throttle_on(vp)) {
- if (max_iosize > HARD_THROTTLE_MAXSIZE)
- max_iosize = HARD_THROTTLE_MAXSIZE;
+ if ( !(flags & CL_PAGEOUT) && cluster_hard_throttle_on(vp, 1)) {
+ if (max_iosize > THROTTLE_MAX_IOSIZE)
+ max_iosize = THROTTLE_MAX_IOSIZE;
async_throttle = HARD_THROTTLE_MAXCNT;
- } else
- async_throttle = VNODE_ASYNC_THROTTLE;
+ } 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;
+
+ max_cluster_size = MAX_CLUSTER_SIZE(vp);
+
+ if (max_iosize > max_cluster_size)
+ max_cluster = max_cluster_size;
+ else
+ max_cluster = max_iosize;
+
+ if (size < max_cluster)
+ max_cluster = size;
+
+ if ((vp->v_mount->mnt_kern_flag & MNTK_SSD) && !ignore_is_ssd)
+ scale = WRITE_THROTTLE_SSD;
+ else
+ scale = WRITE_THROTTLE;
+
+ if (flags & CL_CLOSE)
+ scale += MAX_CLUSTERS;
+
+ async_throttle = min(IO_SCALE(vp, VNODE_ASYNC_THROTTLE), ((scale * max_cluster_size) / max_cluster) - 1);
+ }
+ }
}
if (flags & CL_AGE)
io_flags |= B_AGE;
- if (flags & CL_DUMP)
- io_flags |= B_NOCACHE;
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_PRESERVE)
+ if (flags & CL_DIRECT_IO)
io_flags |= B_PHYS;
- if (flags & CL_KEEPCACHED)
- io_flags |= B_CACHE;
+ 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))) {
/*
zero_offset = upl_offset + non_rounded_size;
}
while (size) {
- int pg_resid;
daddr64_t blkno;
daddr64_t lblkno;
+ u_int io_size_wanted;
+ size_t io_size_tmp;
if (size > max_iosize)
io_size = max_iosize;
else
io_size = size;
+
+ io_size_wanted = io_size;
+ io_size_tmp = (size_t)io_size;
- if ((error = VNOP_BLOCKMAP(vp, f_offset, io_size, &blkno, (size_t *)&io_size, NULL, bmap_flags, NULL))) {
+ if ((error = VNOP_BLOCKMAP(vp, f_offset, io_size, &blkno, &io_size_tmp, NULL, bmap_flags, NULL)))
break;
- }
+
+ if (io_size_tmp > io_size_wanted)
+ io_size = io_size_wanted;
+ else
+ io_size = (u_int)io_size_tmp;
+
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, io_size, zero_offset, 0);
+ (int)f_offset, (int)(blkno>>32), (int)blkno, io_size, 0);
if (io_size == 0) {
/*
break;
}
if ( !(flags & CL_READ) && blkno == -1) {
- off_t e_offset;
+ off_t e_offset;
+ int pageout_flags;
+ if (upl_get_internal_vectorupl(upl))
+ panic("Vector UPLs should not take this code-path\n");
/*
* we're writing into a 'hole'
*/
error = EINVAL;
break;
}
- if ( !(flags & CL_COMMIT)) {
- /*
- * currently writes always request the commit to happen
- * as part of the io completion... however, if the CL_COMMIT
- * flag isn't specified, than we can't issue the abort_range
- * since the call site is going to abort or commit the same upl..
- * in this case we can only return an error
- */
- error = EINVAL;
- break;
- }
/*
* we can get here if the cluster code happens to
* pick up a page that was dirtied via mmap vs
* 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_sync_range, 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
*/
- ubc_upl_abort_range(upl, trunc_page(upl_offset), PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY);
+ pageout_flags = UPL_MSYNC | UPL_VNODE_PAGER | UPL_NESTED_PAGEOUT;
- e_offset = round_page_64(f_offset + 1);
+ if ( !(flags & CL_ASYNC))
+ pageout_flags |= UPL_IOSYNC;
+ if ( !(flags & CL_COMMIT))
+ pageout_flags |= UPL_NOCOMMIT;
- if (ubc_sync_range(vp, f_offset, e_offset, UBC_PUSHDIRTY) == 0) {
- error = EINVAL;
- break;
- }
- io_size = e_offset - f_offset;
+ if (cbp_head) {
+ buf_t last_cbp;
- f_offset += io_size;
- upl_offset += io_size;
+ /*
+ * 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 just because all of the current
+ * I/O linked to this transaction has completed...
+ */
+ cluster_wait_IO(cbp_head, (flags & CL_ASYNC));
- if (size >= io_size)
- size -= io_size;
- else
+ /*
+ * we've got a transcation that
+ * includes the page we're about to push out through vnode_pageout...
+ * find the last bp in the list which will be the one that
+ * includes the head of this page and round it's iosize down
+ * to a page boundary...
+ */
+ for (last_cbp = cbp = cbp_head; cbp->b_trans_next; cbp = cbp->b_trans_next)
+ last_cbp = cbp;
+
+ cbp->b_bcount &= ~PAGE_MASK;
+
+ if (cbp->b_bcount == 0) {
+ /*
+ * this buf no longer has any I/O associated with it
+ */
+ free_io_buf(cbp);
+
+ if (cbp == cbp_head) {
+ /*
+ * the buf we just freed was the only buf in
+ * this transaction... so there's no I/O to do
+ */
+ cbp_head = NULL;
+ } else {
+ /*
+ * remove the buf we just freed from
+ * the transaction list
+ */
+ last_cbp->b_trans_next = NULL;
+ cbp_tail = last_cbp;
+ }
+ }
+ 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);
+
+ cluster_complete_transaction(&cbp_head, callback_arg, &retval, flags, 0);
+
+ trans_count = 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;
+
+ f_offset += io_size;
+ upl_offset += io_size;
+
+ if (size >= io_size)
+ size -= io_size;
+ else
size = 0;
/*
* keep track of how much of the original request
*/
size = 0;
}
+ if (error) {
+ if (size == 0)
+ flags &= ~CL_COMMIT;
+ break;
+ }
continue;
}
lblkno = (daddr64_t)(f_offset / PAGE_SIZE_64);
pg_offset = upl_offset & PAGE_MASK;
if (flags & CL_DEV_MEMORY) {
- /*
- * currently, can't deal with reading 'holes' in file
- */
- if (blkno == -1) {
- error = EINVAL;
- break;
- }
/*
* treat physical requests as one 'giant' page
*/
pg_count = (io_size + pg_offset + (PAGE_SIZE - 1)) / PAGE_SIZE;
if ((flags & CL_READ) && blkno == -1) {
+ vm_offset_t commit_offset;
int bytes_to_zero;
+ int complete_transaction_now = 0;
/*
* 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 (zero_offset && io_size == size) {
+ if (io_size >= (u_int)non_rounded_size) {
/*
* if this upl contains the EOF and it is not a multiple of PAGE_SIZE
* than 'zero_offset' will be non-zero
* 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
*/
- bytes_to_zero = (((upl_offset + io_size) + (PAGE_SIZE - 1)) & ~PAGE_MASK) - upl_offset;
+ bytes_to_zero = non_rounded_size;
+ if (!(flags & CL_NOZERO))
+ bytes_to_zero = (((upl_offset + io_size) + (PAGE_SIZE - 1)) & ~PAGE_MASK) - upl_offset;
zero_offset = 0;
} else
bytes_to_zero = io_size;
- cluster_zero(upl, upl_offset, bytes_to_zero, real_bp);
+ pg_count = 0;
+
+ cluster_zero(upl, upl_offset, bytes_to_zero, real_bp);
- if (cbp_head)
+ if (cbp_head) {
+ int pg_resid;
+
/*
* 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
*/
- pg_count = (io_size - pg_offset) / PAGE_SIZE;
- else {
- /*
- * no pending I/O to pick up that first page
- * so, we have to make sure it gets committed
- * here.
- * set the pg_offset to 0 so that the upl_commit_range
- * starts with this page
- */
- pg_count = (io_size + pg_offset) / PAGE_SIZE;
- pg_offset = 0;
- }
- if (io_size == size && ((upl_offset + io_size) & PAGE_MASK))
+ commit_offset = (upl_offset + (PAGE_SIZE - 1)) & ~PAGE_MASK;
+
+ 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
+ */
+ 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;
+ }
+ } else {
/*
- * if we're done with the request for this UPL
- * then we have to make sure to commit the last page
- * even if we only partially zero-filled it
+ * 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
*/
- pg_count++;
-
- if (pg_count) {
- if (pg_offset)
- pg_resid = PAGE_SIZE - pg_offset;
+ if ((int)io_size >= non_rounded_size)
+ pg_count = (pg_offset + bytes_to_zero + (PAGE_SIZE - 1)) / PAGE_SIZE;
else
- pg_resid = 0;
+ pg_count = (pg_offset + bytes_to_zero) / PAGE_SIZE;
- if (flags & CL_COMMIT)
- ubc_upl_commit_range(upl,
- (upl_offset + pg_resid) & ~PAGE_MASK,
- pg_count * PAGE_SIZE,
- UPL_COMMIT_CLEAR_DIRTY | UPL_COMMIT_FREE_ON_EMPTY);
+ commit_offset = upl_offset & ~PAGE_MASK;
+ }
+ 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
*/
size = 0;
}
- if (cbp_head && pg_count)
- goto start_io;
- continue;
+ if (cbp_head && (complete_transaction_now || size == 0)) {
+ cluster_wait_IO(cbp_head, (flags & CL_ASYNC));
+
+ cluster_EOT(cbp_head, cbp_tail, size == 0 ? zero_offset : 0);
+
+ cluster_complete_transaction(&cbp_head, callback_arg, &retval, flags, 0);
+ trans_count = 0;
+ }
+ continue;
}
if (pg_count > max_vectors) {
if (((pg_count - max_vectors) * PAGE_SIZE) > io_size) {
pg_count = max_vectors;
}
}
+ /*
+ * 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 (flags & CL_ASYNC) {
- if (buf_setcallback(cbp, (void *)cluster_iodone, NULL))
+ 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;
cbp->b_lblkno = lblkno;
cbp->b_blkno = blkno;
} 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;
+ *(buf_t *)(&cbp->b_trans_head) = cbp_head;
+
trans_count++;
upl_offset += io_size;
*/
size = 0;
}
- if ( (!(upl_offset & PAGE_MASK) && !(flags & CL_DEV_MEMORY) && ((flags & CL_ASYNC) || trans_count > 8)) || 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) ) {
/*
- * if we have no more I/O to issue or
+ * 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
+ * and ...
+ * it's either an ASYNC request or
* we've already accumulated more than 8 I/O's into
- * this transaction and it's not an I/O directed to
- * special DEVICE memory
- * then go ahead and issue the I/O
+ * 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
*/
-start_io:
- if (real_bp) {
- cbp_head->b_flags |= B_NEED_IODONE;
- cbp_head->b_real_bp = real_bp;
- } else
- cbp_head->b_real_bp = (buf_t)NULL;
-
- if (size == 0) {
- /*
- * we're about to issue the last I/O for this upl
- * if this was a read to the eof and the eof doesn't
- * finish on a page boundary, than we need to zero-fill
- * the rest of the page....
- */
- cbp_head->b_validend = zero_offset;
- } else
- cbp_head->b_validend = 0;
-
- if (flags & CL_THROTTLE)
- (void)vnode_waitforwrites(vp, async_throttle, 0, 0, (char *)"cluster_io");
-
- for (cbp = cbp_head; cbp;) {
- buf_t cbp_next;
+ need_EOT = TRUE;
+ }
+ if (need_EOT == TRUE)
+ cluster_EOT(cbp_head, cbp_tail, size == 0 ? zero_offset : 0);
- if ( !(io_flags & B_READ))
- vnode_startwrite(vp);
+ if (flags & CL_THROTTLE)
+ (void)vnode_waitforwrites(vp, async_throttle, 0, 0, "cluster_io");
- cbp_next = cbp->b_trans_next;
+ if ( !(io_flags & B_READ))
+ vnode_startwrite(vp);
- (void) VNOP_STRATEGY(cbp);
- cbp = cbp_next;
- }
- if ( !(flags & CL_ASYNC)) {
- int dummy;
-
- for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next)
- buf_biowait(cbp);
-
- if ((error = cluster_iodone(cbp_head, (void *)&dummy))) {
- if (((flags & (CL_PAGEOUT | CL_KEEPCACHED)) == CL_PAGEOUT) && (error == ENXIO))
- error = 0; /* drop the error */
- else {
- if (retval == 0)
- retval = error;
- error = 0;
- }
- }
- }
- cbp_head = (buf_t)NULL;
- cbp_tail = (buf_t)NULL;
+ 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);
+
+ if (need_EOT == TRUE) {
+ if ( !(flags & CL_ASYNC))
+ cluster_complete_transaction(&cbp_head, callback_arg, &retval, flags, 1);
+ need_EOT = FALSE;
trans_count = 0;
+ cbp_head = NULL;
}
- }
+ }
if (error) {
int abort_size;
io_size = 0;
- for (cbp = cbp_head; cbp;) {
- buf_t cbp_next;
-
- upl_offset -= cbp->b_bcount;
- size += cbp->b_bcount;
- io_size += cbp->b_bcount;
+ if (cbp_head) {
+ /*
+ * first wait until all of the outstanding I/O
+ * for this partial transaction has completed
+ */
+ cluster_wait_IO(cbp_head, (flags & CL_ASYNC));
+
+ /*
+ * Rewind the upl offset to the beginning of the
+ * transaction.
+ */
+ upl_offset = cbp_head->b_uploffset;
+
+ for (cbp = cbp_head; cbp;) {
+ buf_t cbp_next;
+
+ size += cbp->b_bcount;
+ io_size += cbp->b_bcount;
- cbp_next = cbp->b_trans_next;
- free_io_buf(cbp);
- cbp = cbp_next;
+ cbp_next = cbp->b_trans_next;
+ free_io_buf(cbp);
+ cbp = cbp_next;
+ }
}
if (iostate) {
int need_wakeup = 0;
* since we never really issued the io
* just go ahead and adjust it back
*/
- lck_mtx_lock(cl_mtxp);
+ lck_mtx_lock_spin(&iostate->io_mtxp);
if (iostate->io_error == 0)
iostate->io_error = error;
* this io stream to change
*/
iostate->io_wanted = 0;
- need_wakeup = 0;
+ need_wakeup = 1;
}
- lck_mtx_unlock(cl_mtxp);
+ lck_mtx_unlock(&iostate->io_mtxp);
if (need_wakeup)
wakeup((caddr_t)&iostate->io_wanted);
}
- pg_offset = upl_offset & PAGE_MASK;
- abort_size = (size + pg_offset + (PAGE_SIZE - 1)) & ~PAGE_MASK;
-
if (flags & CL_COMMIT) {
- int upl_abort_code;
-
- if (flags & CL_PRESERVE) {
- ubc_upl_commit_range(upl, upl_offset - pg_offset, abort_size,
- UPL_COMMIT_FREE_ON_EMPTY);
- } else {
- if ((flags & CL_PAGEOUT) && (error != ENXIO)) /* transient error */
- 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;
+ int upl_flags;
- ubc_upl_abort_range(upl, upl_offset - pg_offset, abort_size,
- upl_abort_code);
- }
+ pg_offset = upl_offset & PAGE_MASK;
+ abort_size = (upl_end_offset - upl_offset + PAGE_MASK) & ~PAGE_MASK;
+
+ upl_flags = cluster_ioerror(upl, upl_offset - pg_offset, abort_size, error, io_flags);
+
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 28)) | DBG_FUNC_NONE,
- (int)upl, upl_offset - pg_offset, abort_size, error, 0);
- }
- if (real_bp) {
- real_bp->b_flags |= B_ERROR;
- real_bp->b_error = error;
-
- buf_biodone(real_bp);
+ 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__);
+
+ 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
+ */
+ 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);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_END, (int)f_offset, size, upl_offset, retval, 0);
return (retval);
}
+#define reset_vector_run_state() \
+ issueVectorUPL = vector_upl_offset = vector_upl_index = vector_upl_iosize = vector_upl_size = 0;
+
+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);
+
+ 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));
+
+}
static int
-cluster_rd_prefetch(vnode_t vp, off_t f_offset, u_int size, off_t filesize)
+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;
(int)f_offset, 0, 0, 0, 0);
return(0);
}
- if (size > (MAX_UPL_TRANSFER * PAGE_SIZE))
- size = (MAX_UPL_TRANSFER * PAGE_SIZE);
- else
- size = (size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
-
if ((off_t)size > (filesize - f_offset))
size = filesize - f_offset;
pages_in_prefetch = (size + (PAGE_SIZE - 1)) / PAGE_SIZE;
- advisory_read(vp, filesize, f_offset, size);
+ advisory_read_ext(vp, filesize, f_offset, size, callback, callback_arg, bflag);
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_END,
(int)f_offset + size, pages_in_prefetch, 0, 1, 0);
static void
-cluster_rd_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl_readahead *rap)
+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;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_START,
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) &&
- (extent->b_addr != (rap->cl_maxra + 1) || rap->cl_ralen == 0))) {
+ 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;
return;
}
+ max_prefetch = MAX_PREFETCH(vp, cluster_max_io_size(vp->v_mount, CL_READ), (vp->v_mount->mnt_kern_flag & MNTK_SSD));
+
+ if ((max_prefetch / PAGE_SIZE) > speculative_prefetch_max)
+ max_prefetch = (speculative_prefetch_max * PAGE_SIZE);
+
+ 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) {
- if ((rap->cl_maxra - extent->e_addr) > (MAX_UPL_TRANSFER / 4)) {
+ if ((rap->cl_maxra - extent->e_addr) > ((max_prefetch / PAGE_SIZE) / 4)) {
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END,
rap->cl_ralen, (int)rap->cl_maxra, (int)rap->cl_lastr, 2, 0);
if (f_offset < filesize) {
daddr64_t read_size;
- rap->cl_ralen = rap->cl_ralen ? min(MAX_UPL_TRANSFER, rap->cl_ralen << 1) : 1;
+ rap->cl_ralen = rap->cl_ralen ? min(max_prefetch / PAGE_SIZE, rap->cl_ralen << 1) : 1;
read_size = (extent->e_addr + 1) - extent->b_addr;
if (read_size > rap->cl_ralen) {
- if (read_size > MAX_UPL_TRANSFER)
- rap->cl_ralen = MAX_UPL_TRANSFER;
+ if (read_size > max_prefetch / PAGE_SIZE)
+ rap->cl_ralen = max_prefetch / PAGE_SIZE;
else
rap->cl_ralen = read_size;
}
- size_of_prefetch = cluster_rd_prefetch(vp, f_offset, rap->cl_ralen * PAGE_SIZE, filesize);
+ size_of_prefetch = cluster_read_prefetch(vp, f_offset, rap->cl_ralen * PAGE_SIZE, filesize, callback, callback_arg, bflag);
if (size_of_prefetch)
rap->cl_maxra = (r_addr + size_of_prefetch) - 1;
rap->cl_ralen, (int)rap->cl_maxra, (int)rap->cl_lastr, 4, 0);
}
+
int
-cluster_pageout(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset,
+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);
+
+}
+
+
+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;
- struct cl_writebehind *wbp;
- if (vp->v_mount->mnt_kern_flag & MNTK_VIRTUALDEV)
- /*
- * if we know we're issuing this I/O to a virtual device (i.e. disk image)
- * then we don't want to enforce this throttle... if we do, we can
- * potentially deadlock since we're stalling the pageout thread at a time
- * when the disk image might need additional memory (which won't be available
- * if the pageout thread can't run)... instead we'll just depend on the throttle
- * that the pageout thread now has in place to deal with external files
- */
- local_flags = CL_PAGEOUT;
- else
- local_flags = CL_PAGEOUT | CL_THROTTLE;
+ local_flags = CL_PAGEOUT | CL_THROTTLE;
if ((flags & UPL_IOSYNC) == 0)
local_flags |= CL_ASYNC;
local_flags |= CL_COMMIT;
if ((flags & UPL_KEEPCACHED))
local_flags |= CL_KEEPCACHED;
+ if (flags & UPL_PAGING_ENCRYPTED)
+ local_flags |= CL_ENCRYPTED;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 52)) | DBG_FUNC_NONE,
ubc_upl_abort_range(upl, upl_offset + rounded_size, size - rounded_size,
UPL_ABORT_FREE_ON_EMPTY);
}
- if ((wbp = cluster_get_wbp(vp, 0)) != NULL)
- wbp->cl_hasbeenpaged = 1;
-
return (cluster_io(vp, upl, upl_offset, f_offset, io_size,
- local_flags, (buf_t)NULL, (struct clios *)NULL));
+ local_flags, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg));
}
+
int
-cluster_pagein(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset,
+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);
+}
+
+
+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;
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;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 56)) | DBG_FUNC_NONE,
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);
-
- if (retval == 0 && !(flags & UPL_NORDAHEAD) && !(vp->v_flag & VRAOFF)) {
- struct cl_readahead *rap;
+ local_flags | CL_READ | CL_PAGEIN, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg);
- rap = cluster_get_rap(vp);
-
- if (rap != NULL) {
- struct cl_extent extent;
-
- extent.b_addr = (daddr64_t)(f_offset / PAGE_SIZE_64);
- extent.e_addr = (daddr64_t)((f_offset + ((off_t)io_size - 1)) / PAGE_SIZE_64);
-
- if (rounded_size == PAGE_SIZE) {
- /*
- * 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
- */
- cluster_rd_ahead(vp, &extent, filesize, rap);
- }
- rap->cl_lastr = extent.e_addr;
-
- lck_mtx_unlock(&rap->cl_lockr);
- }
- }
return (retval);
}
+
int
cluster_bp(buf_t bp)
+{
+ return cluster_bp_ext(bp, NULL, NULL);
+}
+
+
+int
+cluster_bp_ext(buf_t bp, int (*callback)(buf_t, void *), void *callback_arg)
{
off_t f_offset;
int flags;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 19)) | DBG_FUNC_START,
- (int)bp, (int)bp->b_lblkno, bp->b_bcount, bp->b_flags, 0);
+ bp, (int)bp->b_lblkno, bp->b_bcount, bp->b_flags, 0);
if (bp->b_flags & B_READ)
flags = CL_ASYNC | CL_READ;
else
flags = CL_ASYNC;
+ if (bp->b_flags & B_PASSIVE)
+ flags |= CL_PASSIVE;
f_offset = ubc_blktooff(bp->b_vp, bp->b_lblkno);
- return (cluster_io(bp->b_vp, bp->b_upl, 0, f_offset, bp->b_bcount, flags, bp, (struct clios *)NULL));
+ return (cluster_io(bp->b_vp, bp->b_upl, 0, f_offset, bp->b_bcount, flags, bp, (struct clios *)NULL, callback, callback_arg));
}
+
+
int
cluster_write(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t headOff, off_t tailOff, int xflags)
{
- int prev_resid;
- u_int clip_size;
- off_t max_io_size;
- int upl_size;
- int upl_flags;
- upl_t upl;
- int retval = 0;
- int flags;
+ return cluster_write_ext(vp, uio, oldEOF, newEOF, headOff, tailOff, xflags, NULL, NULL);
+}
+
+
+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 (vp->v_flag & VNOCACHE_DATA)
- flags |= IO_NOCACHE;
+ if (flags & IO_PASSIVE)
+ bflag = CL_PASSIVE;
+ else
+ bflag = 0;
- if ( (!(flags & IO_NOCACHE)) || (!uio) || (!UIO_SEG_IS_USER_SPACE(uio->uio_segflg))) {
+ if (vp->v_flag & VNOCACHE_DATA){
+ flags |= IO_NOCACHE;
+ bflag |= CL_NOCACHE;
+ }
+ if (uio == NULL) {
/*
- * go do a write through the cache if one of the following is true....
- * NOCACHE is not true
- * there is no uio structure or it doesn't target USERSPACE
+ * no user data...
+ * this call is being made to zero-fill some range in the file
*/
- return (cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags));
- }
+ retval = cluster_write_copy(vp, NULL, (u_int32_t)0, oldEOF, newEOF, headOff, tailOff, flags, callback, callback_arg);
-#if LP64_DEBUG
- if (IS_VALID_UIO_SEGFLG(uio->uio_segflg) == 0) {
- panic("%s :%d - invalid uio_segflg\n", __FILE__, __LINE__);
+ return(retval);
}
-#endif /* LP64_DEBUG */
-
- while (uio_resid(uio) && uio->uio_offset < newEOF && retval == 0) {
- user_size_t iov_len;
- user_addr_t iov_base;
-
- /*
- * we know we have a resid, so this is safe
- * skip over any emtpy vectors
- */
- uio_update(uio, (user_size_t)0);
-
- iov_len = uio_curriovlen(uio);
- iov_base = uio_curriovbase(uio);
-
- upl_size = PAGE_SIZE;
- upl_flags = UPL_QUERY_OBJECT_TYPE;
-
- // LP64todo - fix this!
- if ((vm_map_get_upl(current_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
- */
- return (EFAULT);
- }
-
- /*
- * We check every vector target but if it is physically
- * contiguous space, we skip the sanity checks.
+ /*
+ * 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
*/
- if (upl_flags & UPL_PHYS_CONTIG) {
- int zflags;
-
- zflags = flags & ~IO_TAILZEROFILL;
- zflags |= IO_HEADZEROFILL;
-
- if (flags & IO_HEADZEROFILL) {
- /*
- * in case we have additional vectors, we don't want to do this again
- */
- flags &= ~IO_HEADZEROFILL;
+ write_type = IO_COPY;
- if ((retval = cluster_write_x(vp, (struct uio *)0, 0, uio->uio_offset, headOff, 0, zflags)))
- return(retval);
- }
- retval = cluster_phys_write(vp, uio, newEOF);
+ while ((cur_resid = uio_resid(uio)) && uio->uio_offset < newEOF && retval == 0) {
+
+ switch (write_type) {
- if (uio_resid(uio) == 0 && (flags & IO_TAILZEROFILL)) {
- return (cluster_write_x(vp, (struct uio *)0, 0, tailOff, uio->uio_offset, 0, zflags));
- }
- }
- else if ((uio_resid(uio) < PAGE_SIZE) || (flags & (IO_TAILZEROFILL | IO_HEADZEROFILL))) {
+ case IO_COPY:
/*
- * we're here because we're don't have a physically contiguous target buffer
- * go do a write through the cache if one of the following is true....
- * the total xfer size is less than a page...
- * we're being asked to ZEROFILL either the head or the tail of the I/O...
+ * 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
*/
- return (cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags));
- }
- // LP64todo - fix this!
- else if (((int)uio->uio_offset & PAGE_MASK) || (CAST_DOWN(int, iov_base) & PAGE_MASK)) {
- if (((int)uio->uio_offset & PAGE_MASK) == (CAST_DOWN(int, iov_base) & PAGE_MASK)) {
+ if (cur_resid > (user_ssize_t)(MAX_IO_REQUEST_SIZE)) {
/*
- * Bring the file offset write up to a pagesize boundary
- * this will also bring the base address to a page boundary
- * since they both are currently on the same offset within a page
- * note: if we get here, uio->uio_resid is greater than PAGE_SIZE
- * so the computed clip_size must always be less than the current uio_resid
+ * 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
*/
- clip_size = (PAGE_SIZE - (uio->uio_offset & PAGE_MASK_64));
+ zflags = flags & ~IO_TAILZEROFILL;
+ flags &= ~IO_HEADZEROFILL;
- /*
- * Fake the resid going into the cluster_write_x call
- * and restore it on the way out.
+ write_length = MAX_IO_REQUEST_SIZE;
+ } else {
+ /*
+ * last call to cluster_write_copy
*/
- // LP64todo - fix this
- prev_resid = uio_resid(uio);
- uio_setresid(uio, clip_size);
+ 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;
- retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags);
+ case IO_CONTIG:
+ zflags = flags & ~(IO_TAILZEROFILL | IO_HEADZEROFILL);
- uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio)));
- } else {
- /*
- * can't get both the file offset and the buffer offset aligned to a page boundary
- * so fire an I/O through the cache for this entire vector
+ if (flags & IO_HEADZEROFILL) {
+ /*
+ * only do this once per request
*/
- // LP64todo - fix this
- clip_size = iov_len;
- // LP64todo - fix this
- prev_resid = uio_resid(uio);
- uio_setresid(uio, clip_size);
-
- retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags);
+ flags &= ~IO_HEADZEROFILL;
- uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio)));
+ 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;
}
- } else {
- /*
- * If we come in here, we know the offset into
- * the file is on a pagesize boundary and the
- * target buffer address is also on a page boundary
- */
- max_io_size = newEOF - uio->uio_offset;
- // LP64todo - fix this
- clip_size = uio_resid(uio);
- if (iov_len < clip_size)
- // LP64todo - fix this!
- clip_size = 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
+ 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
*/
- // LP64todo - fix this
- prev_resid = uio_resid(uio);
- uio_setresid(uio, clip_size);
-
- retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags);
-
- uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio)));
- } else {
- /* round clip_size down to a multiple of pagesize */
- clip_size = clip_size & ~(PAGE_MASK);
- // LP64todo - fix this
- prev_resid = uio_resid(uio);
- uio_setresid(uio, clip_size);
-
- retval = cluster_nocopy_write(vp, uio, newEOF);
-
- if ((retval == 0) && uio_resid(uio))
- retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags);
-
- uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio)));
+ 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);
}
- } /* end else */
- } /* end while */
+ break;
- return(retval);
+ 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_nocopy_write(vnode_t vp, struct uio *uio, off_t newEOF)
+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_t upl;
upl_page_info_t *pl;
vm_offset_t upl_offset;
- int io_size;
- int io_flag;
- int upl_size;
- int upl_needed_size;
- int pages_in_pl;
+ 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;
int upl_flags;
kern_return_t kret;
- int i;
+ mach_msg_type_number_t i;
int force_data_sync;
- int error = 0;
+ int retval = 0;
+ int first_IO = 1;
struct clios iostate;
- struct cl_writebehind *wbp;
+ 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;
+ 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;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_START,
- (int)uio->uio_offset, (int)uio_resid(uio),
- (int)newEOF, 0, 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
*/
-
- if ((wbp = cluster_get_wbp(vp, CLW_RETURNLOCKED)) != NULL) {
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_START,
+ (int)uio->uio_offset, *write_length, (int)newEOF, 0, 0);
- cluster_try_push(wbp, vp, newEOF, 0, 1);
+ max_upl_size = cluster_max_io_size(vp->v_mount, CL_WRITE);
- lck_mtx_unlock(&wbp->cl_lockw);
- }
+ io_flag = CL_ASYNC | CL_PRESERVE | CL_COMMIT | CL_THROTTLE | CL_DIRECT_IO;
+
+ if (flags & IO_PASSIVE)
+ io_flag |= CL_PASSIVE;
+
+ if (flags & IO_NOCACHE)
+ io_flag |= CL_NOCACHE;
+
iostate.io_completed = 0;
iostate.io_issued = 0;
iostate.io_error = 0;
iostate.io_wanted = 0;
- while (uio_resid(uio) && uio->uio_offset < newEOF && error == 0) {
- user_addr_t iov_base;
+ 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;
+ }
- io_size = uio_resid(uio);
+next_dwrite:
+ io_req_size = *write_length;
+ iov_base = uio_curriovbase(uio);
- if (io_size > (MAX_UPL_TRANSFER * PAGE_SIZE))
- io_size = MAX_UPL_TRANSFER * PAGE_SIZE;
+ offset_in_file = (u_int32_t)uio->uio_offset & PAGE_MASK;
+ offset_in_iovbase = (u_int32_t)iov_base & mem_alignment_mask;
- iov_base = uio_curriovbase(uio);
+ 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;
+ }
- // LP64todo - fix this!
- upl_offset = CAST_DOWN(vm_offset_t, iov_base) & PAGE_MASK;
-
+ while (io_req_size >= PAGE_SIZE && uio->uio_offset < newEOF && retval == 0) {
+ int throttle_type;
+
+ if ( (throttle_type = cluster_hard_throttle_on(vp, 1)) ) {
+ /*
+ * 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 == 2) {
+ /*
+ * 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;
+ }
+
+ if (first_IO) {
+ cluster_syncup(vp, newEOF, callback, callback_arg);
+ first_IO = 0;
+ }
+ io_size = io_req_size & ~PAGE_MASK;
+ iov_base = uio_curriovbase(uio);
+
+ 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.
+ */
+ 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.
+ */
+ }
+
+ 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,
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;
- // LP64todo - fix this!
kret = vm_map_get_upl(current_map(),
(vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)),
&upl_size,
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END,
0, 0, 0, kret, 0);
/*
- * cluster_nocopy_write: failed to get pagelist
+ * 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_writes;
+ goto wait_for_dwrites;
}
pl = UPL_GET_INTERNAL_PAGE_LIST(upl);
pages_in_pl = upl_size / PAGE_SIZE;
* didn't get all the pages back that we
* needed... release this upl and try again
*/
- ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size,
- UPL_ABORT_FREE_ON_EMPTY);
+ ubc_upl_abort(upl, 0);
}
if (force_data_sync >= 3) {
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END,
* off as async requests... we need to wait for the I/O
* to complete before returning
*/
- goto wait_for_writes;
+ goto wait_for_dwrites;
}
/*
* 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 (upl_size < upl_needed_size) {
+ if (upl_size && upl_offset == 0)
+ io_size = upl_size;
+ else
+ io_size = 0;
+ }
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_range(upl, (upl_offset & ~PAGE_MASK), upl_size,
- UPL_ABORT_FREE_ON_EMPTY);
+ ubc_upl_abort(upl, 0);
/*
* 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_writes;
+ goto wait_for_dwrites;
}
+
+ 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.
+ */
+ }
+
/*
* Now look for pages already in the cache
* and throw them away.
* if there are already too many outstanding writes
* wait until some complete before issuing the next
*/
- lck_mtx_lock(cl_mtxp);
-
- while ((iostate.io_issued - iostate.io_completed) > (2 * MAX_UPL_TRANSFER * PAGE_SIZE)) {
- iostate.io_wanted = 1;
- msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_nocopy_write", 0);
- }
- lck_mtx_unlock(cl_mtxp);
+ if (iostate.io_issued > iostate.io_completed)
+ cluster_iostate_wait(&iostate, max_upl_size * IO_SCALE(vp, 2), "cluster_write_direct");
if (iostate.io_error) {
/*
* go wait for all writes that are part of this stream
* to complete before returning the error to the caller
*/
- ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size,
- UPL_ABORT_FREE_ON_EMPTY);
+ ubc_upl_abort(upl, 0);
- goto wait_for_writes;
+ goto wait_for_dwrites;
}
- io_flag = CL_ASYNC | CL_PRESERVE | CL_COMMIT | CL_THROTTLE;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 77)) | DBG_FUNC_START,
(int)upl_offset, (int)uio->uio_offset, io_size, io_flag, 0);
- error = cluster_io(vp, upl, upl_offset, uio->uio_offset,
- io_size, io_flag, (buf_t)NULL, &iostate);
+ 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, (int)uio_resid(uio), error, 0);
+ (int)upl_offset, (int)uio->uio_offset, io_req_size, retval, 0);
} /* end while */
-wait_for_writes:
- /*
- * make sure all async writes issued as part of this stream
- * have completed before we return
- */
- lck_mtx_lock(cl_mtxp);
+ if (retval == 0 && iostate.io_error == 0 && io_req_size == 0) {
- while (iostate.io_issued != iostate.io_completed) {
- iostate.io_wanted = 1;
- msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_nocopy_write", 0);
- }
- lck_mtx_unlock(cl_mtxp);
+ 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();
+ }
+ if (iostate.io_issued > iostate.io_completed) {
+ /*
+ * make sure all async writes issued as part of this stream
+ * have completed before we return
+ */
+ cluster_iostate_wait(&iostate, 0, "cluster_write_direct");
+ }
if (iostate.io_error)
- error = 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, (int)uio->uio_resid, error, 4, 0);
+ (int)uio->uio_offset, io_req_size, retval, 4, 0);
- return (error);
+ return (retval);
}
static int
-cluster_phys_write(vnode_t vp, struct uio *uio, off_t newEOF)
+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;
- addr64_t src_paddr;
- upl_t upl;
+ addr64_t src_paddr = 0;
+ upl_t upl[MAX_VECTS];
vm_offset_t upl_offset;
- int tail_size;
- int io_size;
- int upl_size;
- int upl_needed_size;
- int pages_in_pl;
+ 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;
int 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;
- int devblocksize;
- struct cl_writebehind *wbp;
+ u_int32_t devblocksize;
+ u_int32_t mem_alignment_mask;
- devblocksize = vp->v_mount->mnt_devblocksize;
/*
* When we enter this routine, we know
- * -- the resid will not exceed iov_len
- * -- the vector target address is physcially contiguous
+ * -- the io_req_size will not exceed iov_len
+ * -- the target address is physically contiguous
*/
- if ((wbp = cluster_get_wbp(vp, CLW_RETURNLOCKED)) != NULL) {
+ cluster_syncup(vp, newEOF, callback, callback_arg);
- cluster_try_push(wbp, vp, newEOF, 0, 1);
+ devblocksize = (u_int32_t)vp->v_mount->mnt_devblocksize;
+ mem_alignment_mask = (u_int32_t)vp->v_mount->mnt_alignmentmask;
- lck_mtx_unlock(&wbp->cl_lockw);
- }
-#if LP64_DEBUG
- if (IS_VALID_UIO_SEGFLG(uio->uio_segflg) == 0) {
- panic("%s :%d - invalid uio_segflg\n", __FILE__, __LINE__);
- }
-#endif /* LP64_DEBUG */
+ 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_cwrite:
+ io_size = *write_length;
- // LP64todo - fix this!
- io_size = (int)uio_curriovlen(uio);
iov_base = uio_curriovbase(uio);
- upl_offset = CAST_DOWN(upl_offset_t, iov_base) & PAGE_MASK;
+ upl_offset = (vm_offset_t)((u_int32_t)iov_base & PAGE_MASK);
upl_needed_size = upl_offset + io_size;
pages_in_pl = 0;
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;
- // LP64todo - fix this!
kret = vm_map_get_upl(current_map(),
(vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)),
- &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0);
+ &upl_size, &upl[cur_upl], NULL, &pages_in_pl, &upl_flags, 0);
if (kret != KERN_SUCCESS) {
/*
- * cluster_phys_write: failed to get pagelist
- * note: return kret here
+ * failed to get pagelist
*/
- return(EINVAL);
+ error = EINVAL;
+ goto wait_for_cwrites;
}
+ num_upl++;
+
/*
* Consider the possibility that upl_size wasn't satisfied.
- * This is a failure in the physical memory case.
*/
if (upl_size < upl_needed_size) {
- ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
- return(EINVAL);
+ /*
+ * This is a failure in the physical memory case.
+ */
+ error = EINVAL;
+ goto wait_for_cwrites;
}
- pl = ubc_upl_pageinfo(upl);
+ pl = ubc_upl_pageinfo(upl[cur_upl]);
src_paddr = ((addr64_t)upl_phys_page(pl, 0) << 12) + (addr64_t)upl_offset;
while (((uio->uio_offset & (devblocksize - 1)) || io_size < devblocksize) && io_size) {
- int head_size;
+ u_int32_t head_size;
- head_size = devblocksize - (int)(uio->uio_offset & (devblocksize - 1));
+ 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);
+ error = cluster_align_phys_io(vp, uio, src_paddr, head_size, 0, callback, callback_arg);
- if (error) {
- ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
+ if (error)
+ goto wait_for_cwrites;
- return(EINVAL);
- }
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;
- if (io_size) {
- /*
- * issue a synchronous write to cluster_io
+ 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
*/
- error = cluster_io(vp, upl, upl_offset, uio->uio_offset,
- io_size, CL_DEV_MEMORY, (buf_t)NULL, (struct clios *)NULL);
- }
- if (error == 0) {
+ if (iostate.io_issued > iostate.io_completed)
+ 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;
+ }
/*
- * The cluster_io write completed successfully,
- * update the uio structure
+ * issue an asynchronous write to cluster_io
*/
- uio_update(uio, (user_size_t)io_size);
+ 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);
- src_paddr += io_size;
+ if (error == 0) {
+ /*
+ * The cluster_io write completed successfully,
+ * update the uio structure
+ */
+ uio_update(uio, (user_size_t)xsize);
- if (tail_size)
- error = cluster_align_phys_io(vp, uio, src_paddr, tail_size, 0);
+ 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:
/*
- * just release our hold on the physically contiguous
- * region without changing any state
- */
- ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
+ * make sure all async writes that are part of this stream
+ * have completed before we proceed
+ */
+ if (iostate.io_issued > iostate.io_completed)
+ 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_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t headOff, off_t tailOff, int flags)
+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;
- int upl_size;
+ vm_size_t upl_size;
off_t upl_f_offset;
int pages_in_upl;
int start_offset;
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;
- int intersection;
struct cl_writebehind *wbp;
+ int bflag;
+ u_int max_cluster_pgcount;
+ u_int max_io_size;
- if ((wbp = cluster_get_wbp(vp, 0)) != NULL)
- {
- if (wbp->cl_hasbeenpaged) {
- /*
- * this vnode had pages cleaned to it by
- * the pager which indicates that either
- * it's not very 'hot', or the system is
- * being overwhelmed by a lot of dirty
- * data being delayed in the VM cache...
- * in either event, we'll push our remaining
- * delayed data at this point... this will
- * be more efficient than paging out 1 page at
- * a time, and will also act as a throttle
- * by delaying this client from writing any
- * more data until all his delayed data has
- * at least been queued to the uderlying driver.
- */
- if (wbp->cl_number || wbp->cl_scmap)
- cluster_push_EOF(vp, newEOF);
-
- wbp->cl_hasbeenpaged = 0;
- }
- }
if (uio) {
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_START,
- (int)uio->uio_offset, uio_resid(uio), (int)oldEOF, (int)newEOF, 0);
+ (int)uio->uio_offset, io_req_size, (int)oldEOF, (int)newEOF, 0);
- // LP64todo - fix this
- io_resid = uio_resid(uio);
+ 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;
+
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...
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) {
- // LP64todo - fix this
- zero_off1 = uio->uio_offset + uio_resid(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
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_UPL_TRANSFER * PAGE_SIZE))
- total_size = MAX_UPL_TRANSFER * PAGE_SIZE;
+ 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_NOCACHE | IO_SYNC | IO_HEADZEROFILL | IO_TAILZEROFILL)) == 0)) {
+ 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_UPL_TRANSFER * PAGE_SIZE))
- total_size -= start_offset;
+ if ((start_offset + total_size) > max_io_size)
+ total_size = max_io_size - start_offset;
xfer_resid = total_size;
- retval = cluster_copy_ubc_data(vp, uio, &xfer_resid, 1);
-
+ retval = cluster_copy_ubc_data_internal(vp, uio, &xfer_resid, 1, 1);
+
if (retval)
break;
- io_resid -= (total_size - xfer_resid);
+ 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;
*/
upl_size = (start_offset + total_size + (PAGE_SIZE - 1)) & ~PAGE_MASK;
- if (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE))
- upl_size = MAX_UPL_TRANSFER * PAGE_SIZE;
+ if (upl_size > max_io_size)
+ upl_size = max_io_size;
pages_in_upl = upl_size / PAGE_SIZE;
io_size = upl_size - start_offset;
upl_size,
&upl,
&pl,
- UPL_SET_LITE | UPL_WILL_MODIFY);
+ UPL_SET_LITE | (( uio!=NULL && (uio->uio_flags & UIO_FLAGS_IS_COMPRESSED_FILE)) ? 0 : UPL_WILL_MODIFY));
if (kret != KERN_SUCCESS)
- panic("cluster_write: failed to get pagelist");
+ panic("cluster_write_copy: failed to get pagelist");
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_END,
- (int)upl, (int)upl_f_offset, start_offset, 0, 0);
+ upl, (int)upl_f_offset, start_offset, 0, 0);
- if (start_offset && !upl_valid_page(pl, 0)) {
+ if (start_offset && upl_f_offset < oldEOF && !upl_valid_page(pl, 0)) {
int read_size;
/*
*/
read_size = PAGE_SIZE;
- if ((upl_f_offset + read_size) > newEOF)
- read_size = newEOF - upl_f_offset;
+ 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, (buf_t)NULL, (struct clios *)NULL);
+ 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
* 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);
+ 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,
- (int)upl, 0, 0, retval, 0);
+ upl, 0, 0, retval, 0);
break;
}
}
read_size = PAGE_SIZE;
- if ((upl_f_offset + upl_offset + read_size) > newEOF)
- read_size = newEOF - (upl_f_offset + upl_offset);
+ 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, (buf_t)NULL, (struct clios *)NULL);
+ 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
* 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);
+ 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,
- (int)upl, 0, 0, retval, 0);
+ upl, 0, 0, retval, 0);
break;
}
}
else
bytes_to_zero = xfer_resid;
- if ( !(flags & (IO_NOZEROVALID | IO_NOZERODIRTY))) {
- cluster_zero(upl, io_offset, bytes_to_zero, NULL);
- } else {
- int zero_pg_index;
-
- 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);
+ bytes_to_zero = cluster_zero_range(upl, pl, flags, io_offset, zero_off, upl_f_offset, bytes_to_zero);
- if ( !upl_valid_page(pl, zero_pg_index)) {
- cluster_zero(upl, io_offset, bytes_to_zero, NULL);
-
- } else if ((flags & (IO_NOZERODIRTY | IO_NOZEROVALID)) == IO_NOZERODIRTY &&
- !upl_dirty_page(pl, zero_pg_index)) {
- cluster_zero(upl, io_offset, bytes_to_zero, NULL);
- }
- }
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, 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,
- (int)upl, 0, 0, retval, 0);
+ upl, 0, 0, retval, 0);
} else {
- io_resid -= bytes_to_move;
+ io_resid -= bytes_to_move;
xfer_resid -= bytes_to_move;
io_offset += bytes_to_move;
}
else
bytes_to_zero = xfer_resid;
- if ( !(flags & (IO_NOZEROVALID | IO_NOZERODIRTY))) {
- cluster_zero(upl, io_offset, bytes_to_zero, NULL);
- } else {
- int zero_pg_index;
-
- bytes_to_zero = min(bytes_to_zero, PAGE_SIZE - (int)(zero_off1 & PAGE_MASK_64));
- zero_pg_index = (int)((zero_off1 - upl_f_offset) / PAGE_SIZE_64);
-
- if ( !upl_valid_page(pl, zero_pg_index)) {
- cluster_zero(upl, io_offset, bytes_to_zero, NULL);
- } else if ((flags & (IO_NOZERODIRTY | IO_NOZEROVALID)) == IO_NOZERODIRTY &&
- !upl_dirty_page(pl, zero_pg_index)) {
- cluster_zero(upl, io_offset, bytes_to_zero, NULL);
- }
- }
+ 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 can_delay;
+ int ret_cluster_try_push;
io_size += start_offset;
- if ((upl_f_offset + io_size) >= newEOF && io_size < upl_size) {
+ 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
*/
cluster_zero(upl, io_size, upl_size - io_size, NULL);
}
- if (flags & IO_SYNC)
+ /*
+ * 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;
-check_cluster:
+ }
/*
* take the lock to protect our accesses
* of the writebehind and sparse cluster state
*/
wbp = cluster_get_wbp(vp, CLW_ALLOCATE | CLW_RETURNLOCKED);
- /*
- * 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 (wbp->cl_scmap) {
if ( !(flags & IO_NOCACHE)) {
/*
* we've fallen into the sparse
* cluster method of delaying dirty pages
- * first, we need to release the upl if we hold one
- * since 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
*/
- if (upl_size)
- ubc_upl_commit_range(upl, 0, upl_size,
- UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY);
-
- sparse_cluster_add(wbp, vp, &cl, newEOF);
+ sparse_cluster_add(&(wbp->cl_scmap), vp, &cl, newEOF, callback, callback_arg);
lck_mtx_unlock(&wbp->cl_lockw);
* to uncached writes on the file, so go ahead
* and push whatever's in the sparse map
* and switch back to normal clustering
- *
- * see the comment above concerning a possible deadlock...
*/
- if (upl_size) {
- ubc_upl_commit_range(upl, 0, upl_size,
- UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY);
- /*
- * setting upl_size to 0 keeps us from committing a
- * second time in the start_new_cluster path
- */
- upl_size = 0;
- }
- sparse_cluster_push(wbp, vp, newEOF, 1);
-
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
* to avoid the deadlock with sparse_cluster_push
*/
goto start_new_cluster;
- }
- upl_offset = 0;
+ }
+ 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
/*
* the current write starts at or after the current cluster
*/
- if (cl.e_addr <= (wbp->cl_clusters[cl_index].b_addr + MAX_UPL_TRANSFER)) {
+ 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
wbp->cl_clusters[cl_index].e_addr = cl.e_addr;
break;
}
- if (cl.b_addr < (wbp->cl_clusters[cl_index].b_addr + MAX_UPL_TRANSFER)) {
+ 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
* 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_UPL_TRANSFER;
-
- if (upl_size) {
- daddr64_t start_pg_in_upl;
-
- start_pg_in_upl = (daddr64_t)(upl_f_offset / PAGE_SIZE_64);
-
- if (start_pg_in_upl < wbp->cl_clusters[cl_index].e_addr) {
- intersection = (int)((wbp->cl_clusters[cl_index].e_addr - start_pg_in_upl) * PAGE_SIZE);
-
- ubc_upl_commit_range(upl, upl_offset, intersection,
- UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY);
- upl_f_offset += intersection;
- upl_offset += intersection;
- upl_size -= intersection;
- }
- }
+ 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;
}
/*
/*
* 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_UPL_TRANSFER) {
+ 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
/*
* the current write completely
* envelops the existing cluster and since
- * each write is limited to at most MAX_UPL_TRANSFER bytes
+ * 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
*/
* get an intersection with the current write
*
*/
- if (cl.e_addr > wbp->cl_clusters[cl_index].e_addr - MAX_UPL_TRANSFER) {
+ 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_UPL_TRANSFER;
-
- if (upl_size) {
- intersection = (int)((cl.e_addr - wbp->cl_clusters[cl_index].b_addr) * PAGE_SIZE);
-
- if (intersection > upl_size)
- /*
- * because the current write may consist of a number of pages found in the cache
- * which are not part of the UPL, we may have an intersection that exceeds
- * the size of the UPL that is also part of this write
- */
- intersection = upl_size;
-
- ubc_upl_commit_range(upl, upl_offset + (upl_size - intersection), intersection,
- UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY);
- upl_size -= intersection;
- }
+ 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;
}
/*
*/
goto delay_io;
- if (wbp->cl_number < MAX_CLUSTERS && !(flags & IO_NOCACHE))
+ 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_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);
+ }
+ 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
* number of remaining clusters... and
* returns the number of currently unused clusters
*/
- int ret_cluster_try_push = 0;
- /* if writes are not deferred, call cluster push immediately */
+ ret_cluster_try_push = 0;
+
+ /*
+ * if writes are not deferred, call cluster push immediately
+ */
if (!((unsigned int)vfs_flags(vp->v_mount) & MNT_DEFWRITE)) {
- if (flags & IO_NOCACHE)
- can_delay = 0;
- else
- can_delay = 1;
- ret_cluster_try_push = cluster_try_push(wbp, vp, newEOF, can_delay, 0);
+ ret_cluster_try_push = cluster_try_push(wbp, vp, newEOF, (flags & IO_NOCACHE) ? 0 : PUSH_DELAY, 0, callback, callback_arg);
}
- /* execute following regardless writes are deferred or not */
+ /*
+ * 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....
- * first, we need to release the upl if we hold one
- * since pages in it may be present in the sparse cluster map (after the cluster_switch)
- * 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
*/
- if (upl_size)
- ubc_upl_commit_range(upl, upl_offset, upl_size,
- UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY);
-
- sparse_cluster_switch(wbp, vp, newEOF);
- sparse_cluster_add(wbp, vp, &cl, newEOF);
+ 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;
}
- /*
- * we pushed one cluster successfully, so we must be sequentially writing this file
- * otherwise, we would have failed and fallen into the sparse cluster support
- * so let's take the opportunity to push out additional clusters as long as we
- * remain below the throttle... this will give us better I/O locality if we're
- * in a copy loop (i.e. we won't jump back and forth between the read and write points
- * however, we don't want to push so much out that the write throttle kicks in and
- * hangs this thread up until some of the I/O completes...
- */
- if (!((unsigned int)vfs_flags(vp->v_mount) & MNT_DEFWRITE)) {
- while (wbp->cl_number && (vp->v_numoutput <= (VNODE_ASYNC_THROTTLE / 2)))
- cluster_try_push(wbp, vp, newEOF, 0, 0);
- }
-
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_nocache = 1;
- else
- wbp->cl_clusters[wbp->cl_number].io_nocache = 0;
+ 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:
- if (upl_size)
- ubc_upl_commit_range(upl, upl_offset, upl_size,
- UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY);
-
lck_mtx_unlock(&wbp->cl_lockw);
continue;
issue_io:
/*
- * we don't hold the vnode lock at this point
+ * we don't hold the lock at this point
*
- * 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.
- * in order to maintain some semblance of coherency with mapped writes
- * we need to drop the current upl and pick it back up with COPYOUT_FROM set
+ * 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_x... by passing along the IO_SYNC flag, we force
- * cluster_push_x to wait until all the I/Os have completed... cluster_push_x is also
+ * 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)
*/
- ubc_upl_commit_range(upl, 0, upl_size,
- UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY);
-
- cl.e_addr = (upl_f_offset + (off_t)upl_size) / PAGE_SIZE_64;
-
- retval = cluster_push_x(vp, &cl, newEOF, flags);
+ 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);
+ 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)
{
- int prev_resid;
- u_int clip_size;
- off_t max_io_size;
- int upl_size;
- int upl_flags;
- upl_t upl;
- int retval = 0;
- int flags;
+ return cluster_read_ext(vp, uio, filesize, xflags, NULL, NULL);
+}
- flags = xflags;
- if (vp->v_flag & VNOCACHE_DATA)
- flags |= IO_NOCACHE;
- if (vp->v_flag & VRAOFF)
- flags |= IO_RAOFF;
+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;
- if (!((flags & IO_NOCACHE) && UIO_SEG_IS_USER_SPACE(uio->uio_segflg))) {
- /*
- * go do a read through the cache if one of the following is true....
- * NOCACHE is not true
- * the uio request doesn't target USERSPACE
- */
- return (cluster_read_x(vp, uio, filesize, flags));
- }
+ flags = xflags;
-#if LP64_DEBUG
- if (IS_VALID_UIO_SEGFLG(uio->uio_segflg) == 0) {
- panic("%s :%d - invalid uio_segflg\n", __FILE__, __LINE__);
+ if (vp->v_flag & VNOCACHE_DATA)
+ flags |= IO_NOCACHE;
+ if ((vp->v_flag & VRAOFF) || speculative_reads_disabled)
+ flags |= IO_RAOFF;
+
+ /*
+ * If we're doing an encrypted IO, then first check to see
+ * if the IO requested was page aligned. If not, then bail
+ * out immediately.
+ */
+ if (flags & IO_ENCRYPTED) {
+ if (read_length & PAGE_MASK) {
+ retval = EINVAL;
+ return retval;
+ }
}
-#endif /* LP64_DEBUG */
- while (uio_resid(uio) && uio->uio_offset < filesize && retval == 0) {
- user_size_t iov_len;
- user_addr_t iov_base;
-
- /*
- * we know we have a resid, so this is safe
- * skip over any emtpy vectors
- */
- uio_update(uio, (user_size_t)0);
-
- iov_len = uio_curriovlen(uio);
- iov_base = uio_curriovbase(uio);
+ /*
+ * 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) || (flags & IO_ENCRYPTED)) && UIO_SEG_IS_USER_SPACE(uio->uio_segflg)) {
+ retval = cluster_io_type(uio, &read_type, &read_length, 0);
+ }
+
+ while ((cur_resid = uio_resid(uio)) && uio->uio_offset < filesize && retval == 0) {
- upl_size = PAGE_SIZE;
- upl_flags = UPL_QUERY_OBJECT_TYPE;
-
- // LP64todo - fix this!
- if ((vm_map_get_upl(current_map(),
- (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)),
- &upl_size, &upl, NULL, NULL, &upl_flags, 0)) != KERN_SUCCESS) {
+ switch (read_type) {
+
+ case IO_COPY:
/*
- * the user app must have passed in an invalid address
+ * 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
*/
- return (EFAULT);
- }
+ if (cur_resid > (user_ssize_t)(MAX_IO_REQUEST_SIZE))
+ io_size = MAX_IO_REQUEST_SIZE;
+ else
+ io_size = (u_int32_t)cur_resid;
- /*
- * We check every vector target but if it is physically
- * contiguous space, we skip the sanity checks.
- */
- if (upl_flags & UPL_PHYS_CONTIG) {
- retval = cluster_phys_read(vp, uio, filesize);
- }
- else if (uio_resid(uio) < PAGE_SIZE) {
- /*
- * we're here because we're don't have a physically contiguous target buffer
- * go do a read through the cache if
- * the total xfer size is less than a page...
- */
- return (cluster_read_x(vp, uio, filesize, flags));
- }
- // LP64todo - fix this!
- else if (((int)uio->uio_offset & PAGE_MASK) || (CAST_DOWN(int, iov_base) & PAGE_MASK)) {
- if (((int)uio->uio_offset & PAGE_MASK) == (CAST_DOWN(int, iov_base) & PAGE_MASK)) {
- /*
- * Bring the file offset read up to a pagesize boundary
- * this will also bring the base address to a page boundary
- * since they both are currently on the same offset within a page
- * note: if we get here, uio->uio_resid is greater than PAGE_SIZE
- * so the computed clip_size must always be less than the current uio_resid
- */
- clip_size = (PAGE_SIZE - (int)(uio->uio_offset & PAGE_MASK_64));
-
- /*
- * Fake the resid going into the cluster_read_x call
- * and restore it on the way out.
- */
- prev_resid = uio_resid(uio);
- // LP64todo - fix this
- uio_setresid(uio, clip_size);
-
- retval = cluster_read_x(vp, uio, filesize, flags);
-
- uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio)));
- } else {
- /*
- * can't get both the file offset and the buffer offset aligned to a page boundary
- * so fire an I/O through the cache for this entire vector
- */
- // LP64todo - fix this!
- clip_size = iov_len;
- prev_resid = uio_resid(uio);
- uio_setresid(uio, clip_size);
-
- retval = cluster_read_x(vp, uio, filesize, flags);
-
- uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio)));
- }
- } 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;
- // LP64todo - fix this
- clip_size = uio_resid(uio);
- if (iov_len < clip_size)
- clip_size = 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.
- */
- // LP64todo - fix this
- prev_resid = uio_resid(uio);
- uio_setresid(uio, clip_size);
+ retval = cluster_read_copy(vp, uio, io_size, filesize, flags, callback, callback_arg);
+ break;
- retval = cluster_read_x(vp, uio, filesize, flags);
+ case IO_DIRECT:
+ retval = cluster_read_direct(vp, uio, filesize, &read_type, &read_length, flags, callback, callback_arg);
+ break;
- uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio)));
- } else {
- /* round clip_size down to a multiple of pagesize */
- clip_size = clip_size & ~(PAGE_MASK);
- // LP64todo - fix this
- prev_resid = uio_resid(uio);
- uio_setresid(uio, clip_size);
+ 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);
+}
- retval = cluster_nocopy_read(vp, uio, filesize);
- if ((retval==0) && uio_resid(uio))
- retval = cluster_read_x(vp, uio, filesize, flags);
- uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio)));
- }
- } /* end else */
- } /* end while */
+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;
- return(retval);
+ 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_x(vnode_t vp, struct uio *uio, off_t filesize, int flags)
+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;
- int upl_size;
+ u_int32_t upl_size;
off_t upl_f_offset;
int start_offset;
int start_pg;
off_t max_size;
off_t last_ioread_offset;
off_t last_request_offset;
- u_int size_of_prefetch;
- u_int io_size;
kern_return_t kret;
int error = 0;
int retval = 0;
- u_int max_rd_size = MAX_UPL_TRANSFER * PAGE_SIZE;
+ 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, uio_resid(uio), (int)filesize, 0, 0);
+ (int)uio->uio_offset, io_req_size, (int)filesize, flags, 0);
+
+ if (flags & IO_ENCRYPTED) {
+ panic ("encrypted blocks will hit UBC!");
+ }
- // LP64todo - fix this
- last_request_offset = uio->uio_offset + uio_resid(uio);
+ policy = proc_get_task_selfdiskacc();
+
+ if (policy == IOPOL_THROTTLE || policy == IOPOL_UTILITY || (flags & IO_NOCACHE))
+ take_reference = 0;
+
+ if (flags & IO_PASSIVE)
+ bflag = CL_PASSIVE;
+ else
+ bflag = 0;
+
+ if (flags & IO_NOCACHE)
+ bflag |= CL_NOCACHE;
+
+ 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;
- if ((flags & (IO_RAOFF|IO_NOCACHE)) ||
- ((last_request_offset & ~PAGE_MASK_64) == (uio->uio_offset & ~PAGE_MASK_64))) {
+ 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_hard_throttle_on(vp)) {
+ if (cluster_hard_throttle_on(vp, 1)) {
+ /*
+ * 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 = HARD_THROTTLE_MAXSIZE;
+ 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 (last_request_offset > filesize)
- last_request_offset = filesize;
- 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
} else
last_ioread_offset = (off_t)0;
- while (uio_resid(uio) && 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;
+ while (io_req_size && uio->uio_offset < filesize && retval == 0) {
- // LP64todo - fix this!
- if ((off_t)((unsigned int)uio_resid(uio)) < max_size)
- io_size = uio_resid(uio);
+ 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_int io_resid;
- u_int io_requested;
+ 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_rd_prefetch since it costs CPU cycles
+ * 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 (size_of_prefetch > max_rd_size)
size_of_prefetch = max_rd_size;
- size_of_prefetch = cluster_rd_prefetch(vp, last_ioread_offset, size_of_prefetch, filesize);
+ 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);
* 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_UPL_TRANSFER * PAGE_SIZE) / 4))
- io_resid = ((MAX_UPL_TRANSFER * PAGE_SIZE) / 4);
+ 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(vp, uio, &io_resid, 0);
+ retval = cluster_copy_ubc_data_internal(vp, uio, (int *)&io_resid, 0, take_reference);
+
+ xsize = io_requested - io_resid;
- io_size -= (io_requested - io_resid);
+ io_size -= xsize;
+ io_req_size -= xsize;
if (retval || io_resid)
/*
*/
break;
- if ((io_size == 0 || last_ioread_offset == last_request_offset) && rd_ahead_enabled) {
+ 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_rd_ahead(vp, &extent, filesize, rap);
+ cluster_read_ahead(vp, &extent, filesize, rap, callback, callback_arg, bflag);
}
}
if (retval)
}
break;
}
- 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;
+ /*
+ * 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_hard_throttle_on(vp, 0) == 2) {
+ 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 (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE) / 4)
- upl_size = (MAX_UPL_TRANSFER * PAGE_SIZE) / 4;
+ 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;
+ }
pages_in_upl = upl_size / PAGE_SIZE;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 33)) | DBG_FUNC_START,
- (int)upl, (int)upl_f_offset, upl_size, start_offset, 0);
+ upl, (int)upl_f_offset, upl_size, start_offset, 0);
kret = ubc_create_upl(vp,
upl_f_offset,
upl_size,
&upl,
&pl,
- UPL_SET_LITE);
+ UPL_FILE_IO | UPL_SET_LITE);
if (kret != KERN_SUCCESS)
- panic("cluster_read: failed to get pagelist");
+ panic("cluster_read_copy: failed to get pagelist");
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 33)) | DBG_FUNC_END,
- (int)upl, (int)upl_f_offset, upl_size, start_offset, 0);
+ upl, (int)upl_f_offset, upl_size, start_offset, 0);
/*
* scan from the beginning of the upl looking for the first
if (upl_valid_page(pl, last_pg))
break;
}
- iostate.io_completed = 0;
- iostate.io_issued = 0;
- iostate.io_error = 0;
- iostate.io_wanted = 0;
if (start_pg < last_pg) {
/*
* 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 ((upl_f_offset + upl_offset + io_size) > filesize)
+ if ((off_t)(upl_f_offset + upl_offset + io_size) > filesize)
io_size = filesize - (upl_f_offset + upl_offset);
/*
*/
error = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset,
- io_size, CL_READ | CL_ASYNC, (buf_t)NULL, &iostate);
+ 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 (!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 uio->uio_resid is
+ * 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.
*/
if (val_size > max_size)
val_size = max_size;
- if (val_size > uio_resid(uio))
- // LP64todo - fix this
- val_size = uio_resid(uio);
+ if (val_size > io_req_size)
+ val_size = io_req_size;
- if (last_ioread_offset == 0)
+ 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 there's still I/O left to do for this request, and...
- * we're not in hard throttle mode, then issue a
- * pre-fetch I/O... the I/O latency will overlap
- * with the copying of the data
- */
- size_of_prefetch = cluster_rd_prefetch(vp, last_ioread_offset, size_of_prefetch, filesize);
- last_ioread_offset += (off_t)(size_of_prefetch * PAGE_SIZE);
+ 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;
+ if (last_ioread_offset > last_request_offset)
+ last_ioread_offset = last_request_offset;
+ }
} else if ((uio->uio_offset + val_size) == last_request_offset) {
/*
* explicitly disabled it
*/
if (rd_ahead_enabled)
- cluster_rd_ahead(vp, &extent, filesize, rap);
+ cluster_read_ahead(vp, &extent, filesize, rap, callback, callback_arg, bflag);
if (rap != NULL) {
if (extent.e_addr < rap->cl_lastr)
rap->cl_lastr = extent.e_addr;
}
}
- lck_mtx_lock(cl_mtxp);
-
- while (iostate.io_issued != iostate.io_completed) {
- iostate.io_wanted = 1;
- msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_read_x", 0);
- }
- lck_mtx_unlock(cl_mtxp);
+ if (iostate.io_issued > iostate.io_completed)
+ cluster_iostate_wait(&iostate, 0, "cluster_read_copy");
if (iostate.io_error)
error = iostate.io_error;
- else
- retval = cluster_copy_upl_data(uio, upl, start_offset, val_size);
+ 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 (iostate.io_issued > iostate.io_completed)
+ 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 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,
- (int)upl, start_pg * PAGE_SIZE, io_size, error, 0);
+ 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
- ubc_upl_commit_range(upl, start_pg * PAGE_SIZE, io_size,
- UPL_COMMIT_CLEAR_DIRTY |
- UPL_COMMIT_FREE_ON_EMPTY |
- UPL_COMMIT_INACTIVATE);
+ UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY);
+ else {
+ int commit_flags = UPL_COMMIT_CLEAR_DIRTY | UPL_COMMIT_FREE_ON_EMPTY;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END,
- (int)upl, start_pg * PAGE_SIZE, io_size, error, 0);
+ 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) {
- int cur_pg;
- int commit_flags;
-
/*
* the set of pages that we issued an I/O for did not encompass
* the entire upl... so just release these without modifying
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,
- (int)upl, -1, pages_in_upl - (last_pg - start_pg), 0, 0);
+ upl, -1, pages_in_upl - (last_pg - start_pg), 0, 0);
- 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) && (flags & IO_NOCACHE))
- 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) && (flags & IO_NOCACHE))
- 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_range(upl, uio_last * PAGE_SIZE,
- (pages_in_upl - uio_last) * PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY);
- }
+ /*
+ * 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,
- (int)upl, -1, -1, 0, 0);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END, upl, -1, -1, 0, 0);
}
}
if (retval == 0)
retval = error;
- if ( uio_resid(uio) ) {
- if (cluster_hard_throttle_on(vp)) {
+ if (io_req_size) {
+ if (cluster_hard_throttle_on(vp, 1)) {
+ /*
+ * 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 = HARD_THROTTLE_MAXSIZE;
+ max_rd_size = THROTTLE_MAX_IOSIZE;
} else {
- if (rap != NULL)
- rd_ahead_enabled = 1;
- prefetch_enabled = 1;
-
- max_rd_size = MAX_UPL_TRANSFER * PAGE_SIZE;
+ if (max_rd_size == THROTTLE_MAX_IOSIZE) {
+ /*
+ * coming out of throttled state
+ */
+ if (policy != IOPOL_THROTTLE && policy != IOPOL_UTILITY) {
+ if (rap != NULL)
+ rd_ahead_enabled = 1;
+ prefetch_enabled = 1;
+ }
+ max_rd_size = max_prefetch;
+ last_ioread_offset = 0;
+ }
}
}
}
+ if (iolock_inited == TRUE) {
+ if (iostate.io_issued > iostate.io_completed) {
+ /*
+ * 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, uio_resid(uio), rap->cl_lastr, retval, 0);
+ (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, uio_resid(uio), 0, retval, 0);
+ (int)uio->uio_offset, io_req_size, 0, retval, 0);
}
return (retval);
static int
-cluster_nocopy_read(vnode_t vp, struct uio *uio, off_t filesize)
+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;
- vm_offset_t upl_offset;
- off_t max_io_size;
- int io_size;
- int upl_size;
- int upl_needed_size;
- int pages_in_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;
int upl_flags;
kern_return_t kret;
- int i;
+ unsigned int i;
int force_data_sync;
int retval = 0;
int no_zero_fill = 0;
- int abort_flag = 0;
+ int io_flag = 0;
+ int misaligned = 0;
struct clios iostate;
- u_int max_rd_size = MAX_UPL_TRANSFER * PAGE_SIZE;
- u_int max_rd_ahead = MAX_UPL_TRANSFER * PAGE_SIZE * 2;
-
+ 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;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_START,
- (int)uio->uio_offset, uio_resid(uio), (int)filesize, 0, 0);
+ (int)uio->uio_offset, (int)filesize, *read_type, *read_length, 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
- */
+ 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;
+ }
iostate.io_completed = 0;
iostate.io_issued = 0;
iostate.io_error = 0;
iostate.io_wanted = 0;
- while (uio_resid(uio) && uio->uio_offset < filesize && retval == 0) {
- user_addr_t iov_base;
+ 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);
+
+next_dread:
+ io_req_size = *read_length;
+ iov_base = uio_curriovbase(uio);
+
+ max_io_size = filesize - uio->uio_offset;
- if (cluster_hard_throttle_on(vp)) {
- max_rd_size = HARD_THROTTLE_MAXSIZE;
- max_rd_ahead = HARD_THROTTLE_MAXSIZE - 1;
+ if ((off_t)io_req_size > max_io_size)
+ io_req_size = max_io_size;
+
+ 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;
+ }
+
+ /*
+ * 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) && (misaligned)) {
+ retval = EINVAL;
+ }
+
+ /*
+ * 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_hard_throttle_on(vp, 1)) {
+ /*
+ * 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_TRANSFER * PAGE_SIZE;
- max_rd_ahead = MAX_UPL_TRANSFER * PAGE_SIZE * 8;
+ max_rd_size = max_upl_size;
+ max_rd_ahead = max_rd_size * IO_SCALE(vp, 2);
+ max_vector_size = MAX_VECTOR_UPL_SIZE;
}
- max_io_size = filesize - uio->uio_offset;
-
- // LP64todo - fix this
- if (max_io_size < (off_t)((unsigned int)uio_resid(uio)))
- io_size = max_io_size;
- else
- io_size = uio_resid(uio);
+ io_start = io_size = io_req_size;
/*
* First look for pages already in the cache
- * and move them to user space.
+ * 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
*/
- retval = cluster_copy_ubc_data(vp, uio, &io_size, 0);
-
- if (retval) {
+ 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 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
+ * 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.
*/
- goto wait_for_reads;
+ 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.
+ */
}
+
/*
- * If we are already finished with this read, then return
+ * 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_size == 0) {
- /*
+ 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)) {
+ if (flags & IO_ENCRYPTED) {
+ /*
+ * Normally, we'd round down to the previous page boundary to
+ * let the UBC manage the zero-filling of the file past the EOF.
+ * But if we're doing encrypted IO, we can't let any of
+ * the data hit the UBC. This means we have to do the full
+ * IO to the upper block boundary of the device block that
+ * contains the EOF. The user will be responsible for not
+ * interpreting data PAST the EOF in its buffer.
+ *
+ * So just bump the IO back up to a multiple of devblocksize
+ */
+ io_size = ((io_size + devblocksize) & ~(devblocksize - 1));
+ io_min = io_size;
+ }
+ else {
+ /*
+ * 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_reads;
+ goto wait_for_dreads;
}
- max_io_size = io_size;
- if (max_io_size > max_rd_size)
- max_io_size = max_rd_size;
+ /*
+ * 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)) {
- io_size = 0;
+ if ((xsize = io_size) > max_rd_size)
+ xsize = max_rd_size;
- ubc_range_op(vp, uio->uio_offset, uio->uio_offset + max_io_size, UPL_ROP_ABSENT, &io_size);
+ io_size = 0;
+
+ 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_hard_throttle_on(vp, 0) == 2) {
+ 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;
- if (io_size == 0)
- /*
- * 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_reads;
-
iov_base = uio_curriovbase(uio);
- // LP64todo - fix this!
- upl_offset = CAST_DOWN(vm_offset_t, iov_base) & PAGE_MASK;
+ 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)) {
+ if (upl_offset == 0 && ((io_size & PAGE_MASK) == 0))
no_zero_fill = 1;
- abort_flag = UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY;
- } else {
+ else
no_zero_fill = 0;
- abort_flag = UPL_ABORT_FREE_ON_EMPTY;
- }
+
for (force_data_sync = 0; force_data_sync < 3; force_data_sync++) {
pages_in_pl = 0;
upl_size = upl_needed_size;
if (force_data_sync)
upl_flags |= UPL_FORCE_DATA_SYNC;
- // LP64todo - fix this!
kret = vm_map_create_upl(current_map(),
(vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)),
&upl_size, &upl, NULL, &pages_in_pl, &upl_flags);
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END,
(int)upl_offset, upl_size, io_size, kret, 0);
/*
- * cluster_nocopy_read: failed to get pagelist
+ * 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_reads;
+ 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_valid_page(pl, i))
+ if (!upl_page_present(pl, i))
break;
}
if (i == pages_in_pl)
break;
- ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, abort_flag);
+ 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_reads;
+ goto wait_for_dreads;
}
/*
* 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 (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_range(upl, (upl_offset & ~PAGE_MASK), upl_size, abort_flag);
- goto wait_for_reads;
+ 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.
+ */
}
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END,
- (int)upl_offset, upl_size, io_size, kret, 0);
/*
* request asynchronously so that we can overlap
* if there are already too many outstanding reads
* wait until some have completed before issuing the next read
*/
- lck_mtx_lock(cl_mtxp);
+ if (iostate.io_issued > iostate.io_completed)
+ cluster_iostate_wait(&iostate, max_rd_ahead, "cluster_read_direct");
- while ((iostate.io_issued - iostate.io_completed) > max_rd_ahead) {
- iostate.io_wanted = 1;
- msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_nocopy_read", 0);
- }
- lck_mtx_unlock(cl_mtxp);
-
if (iostate.io_error) {
/*
* one of the earlier reads we issued ran into a hard error
* go wait for any other reads to complete before
* returning the error to the caller
*/
- ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, abort_flag);
+ ubc_upl_abort(upl, 0);
- goto wait_for_reads;
+ goto wait_for_dreads;
}
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_START,
- (int)upl, (int)upl_offset, (int)uio->uio_offset, io_size, 0);
+ 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 {
- retval = cluster_io(vp, upl, upl_offset, uio->uio_offset, io_size,
- CL_PRESERVE | CL_COMMIT | CL_READ | CL_ASYNC | CL_NOZERO,
- (buf_t)NULL, &iostate);
+ 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();
+ }
+ }
/*
* update the uio structure
*/
- uio_update(uio, (user_size_t)io_size);
+ 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);
+ }
+ /*
+ * Under normal circumstances, the io_size should not be
+ * bigger than the io_req_size, but we may have had to round up
+ * to the end of the page in the encrypted IO case. In that case only,
+ * ensure that we only decrement io_req_size to 0.
+ */
+ if ((flags & IO_ENCRYPTED) && (io_size > io_req_size)) {
+ io_req_size = 0;
+ }
+ else {
+ io_req_size -= io_size;
+ }
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_END,
- (int)upl, (int)uio->uio_offset, (int)uio_resid(uio), retval, 0);
+ upl, (int)uio->uio_offset, io_req_size, retval, 0);
} /* end while */
-wait_for_reads:
+ 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();
+ }
/*
* make sure all async reads that are part of this stream
* have completed before we return
*/
- lck_mtx_lock(cl_mtxp);
-
- while (iostate.io_issued != iostate.io_completed) {
- iostate.io_wanted = 1;
- msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_nocopy_read", 0);
- }
- lck_mtx_unlock(cl_mtxp);
+ if (iostate.io_issued > iostate.io_completed)
+ cluster_iostate_wait(&iostate, 0, "cluster_read_direct");
if (iostate.io_error)
- retval = 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
+ */
+ 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), 6, retval, 0);
+ (int)uio->uio_offset, (int)uio_resid(uio), io_req_size, retval, 0);
return (retval);
}
static int
-cluster_phys_read(vnode_t vp, struct uio *uio, off_t filesize)
+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;
+ upl_t upl[MAX_VECTS];
vm_offset_t upl_offset;
- addr64_t dst_paddr;
- off_t max_size;
- int io_size;
- user_size_t iov_len;
+ addr64_t dst_paddr = 0;
user_addr_t iov_base;
- int tail_size;
- int upl_size;
- int upl_needed_size;
- int pages_in_pl;
+ off_t max_size;
+ upl_size_t upl_size;
+ vm_size_t upl_needed_size;
+ mach_msg_type_number_t pages_in_pl;
int upl_flags;
kern_return_t kret;
struct clios iostate;
- int error;
- int devblocksize;
-
- devblocksize = vp->v_mount->mnt_devblocksize;
+ 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 resid will not exceed iov_len
- * -- the target address is physically contiguous
+ * -- 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);
-#if LP64_DEBUG
- if (IS_VALID_UIO_SEGFLG(uio->uio_segflg) == 0) {
- panic("%s :%d - invalid uio_segflg\n", __FILE__, __LINE__);
- }
-#endif /* LP64_DEBUG */
+ devblocksize = (u_int32_t)vp->v_mount->mnt_devblocksize;
+ mem_alignment_mask = (u_int32_t)vp->v_mount->mnt_alignmentmask;
- iov_len = uio_curriovlen(uio);
- iov_base = uio_curriovbase(uio);
+ 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;
- // LP64todo - fix this!
- if (max_size < 0 || (u_int64_t)max_size > iov_len)
- io_size = iov_len;
- else
+ if (io_size > max_size)
io_size = max_size;
- // LP64todo - fix this!
- upl_offset = CAST_DOWN(vm_offset_t, iov_base) & PAGE_MASK;
+ iov_base = uio_curriovbase(uio);
+
+ upl_offset = (vm_offset_t)((u_int32_t)iov_base & PAGE_MASK);
upl_needed_size = upl_offset + io_size;
- error = 0;
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;
+
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 92)) | DBG_FUNC_START,
+ (int)upl_offset, (int)upl_size, (int)iov_base, io_size, 0);
+
kret = vm_map_get_upl(current_map(),
(vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)),
- &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0);
+ &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) {
/*
- * cluster_phys_read: failed to get pagelist
+ * failed to get pagelist
*/
- return(EINVAL);
+ error = EINVAL;
+ goto wait_for_creads;
}
+ num_upl++;
+
if (upl_size < upl_needed_size) {
/*
* The upl_size wasn't satisfied.
*/
- ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
-
- return(EINVAL);
+ error = EINVAL;
+ goto wait_for_creads;
}
- pl = ubc_upl_pageinfo(upl);
+ pl = ubc_upl_pageinfo(upl[cur_upl]);
dst_paddr = ((addr64_t)upl_phys_page(pl, 0) << 12) + (addr64_t)upl_offset;
while (((uio->uio_offset & (devblocksize - 1)) || io_size < devblocksize) && io_size) {
- int head_size;
+ u_int32_t head_size;
- head_size = devblocksize - (int)(uio->uio_offset & (devblocksize - 1));
+ 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);
+ error = cluster_align_phys_io(vp, uio, dst_paddr, head_size, CL_READ, callback, callback_arg);
- if (error) {
- ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
+ if (error)
+ goto wait_for_creads;
- return(EINVAL);
- }
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;
- iostate.io_completed = 0;
- iostate.io_issued = 0;
- iostate.io_error = 0;
- iostate.io_wanted = 0;
+ io_size -= tail_size;
while (io_size && error == 0) {
- int xsize;
- if (io_size > (MAX_UPL_TRANSFER * PAGE_SIZE))
- xsize = MAX_UPL_TRANSFER * PAGE_SIZE;
+ if (io_size > MAX_IO_CONTIG_SIZE)
+ xsize = MAX_IO_CONTIG_SIZE;
else
xsize = io_size;
/*
* if there are already too many outstanding reads
* wait until some have completed before issuing the next
*/
- lck_mtx_lock(cl_mtxp);
-
- while ((iostate.io_issued - iostate.io_completed) > (8 * MAX_UPL_TRANSFER * PAGE_SIZE)) {
- iostate.io_wanted = 1;
- msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_phys_read", 0);
- }
- lck_mtx_unlock(cl_mtxp);
+ if (iostate.io_issued > iostate.io_completed)
+ cluster_iostate_wait(&iostate, MAX_IO_CONTIG_SIZE * IO_SCALE(vp, 2), "cluster_read_contig");
- error = cluster_io(vp, upl, upl_offset, uio->uio_offset, xsize,
- CL_READ | CL_NOZERO | CL_DEV_MEMORY | CL_ASYNC,
- (buf_t)NULL, &iostate);
+ 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
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
*/
- lck_mtx_lock(cl_mtxp);
-
- while (iostate.io_issued != iostate.io_completed) {
- iostate.io_wanted = 1;
- msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_phys_read", 0);
- }
- lck_mtx_unlock(cl_mtxp);
+ if (iostate.io_issued > iostate.io_completed)
+ 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);
+ error = cluster_align_phys_io(vp, uio, dst_paddr, tail_size, CL_READ, callback, callback_arg);
- /*
- * just release our hold on the physically contiguous
- * region without changing any state
- */
- ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY);
+ 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;
+ int 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;
+
+ if ((vm_map_get_upl(current_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;
+ int upl_size;
off_t upl_f_offset;
int start_offset;
int start_pg;
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 CONFIG_EMBEDDED
+ if (max_io_size > speculative_prefetch_max_iosize)
+ max_io_size = speculative_prefetch_max_iosize;
+#else
+ 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;
+ }
+#endif
+
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 60)) | DBG_FUNC_START,
(int)f_offset, resid, (int)filesize, 0, 0);
io_size = max_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;
+ if ((uint32_t)upl_size > max_io_size)
+ upl_size = max_io_size;
skip_range = 0;
/*
pages_in_upl = upl_size / PAGE_SIZE;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 61)) | DBG_FUNC_START,
- (int)upl, (int)upl_f_offset, upl_size, start_offset, 0);
+ upl, (int)upl_f_offset, upl_size, start_offset, 0);
kret = ubc_create_upl(vp,
upl_f_offset,
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 61)) | DBG_FUNC_END,
- (int)upl, (int)upl_f_offset, upl_size, start_offset, 0);
+ upl, (int)upl_f_offset, upl_size, start_offset, 0);
for (last_pg = 0; last_pg < pages_in_upl; ) {
upl_offset = start_pg * PAGE_SIZE;
io_size = (last_pg - start_pg) * PAGE_SIZE;
- if ((upl_f_offset + upl_offset + io_size) > filesize)
+ 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, (buf_t)NULL, (struct clios *)NULL);
+ CL_ASYNC | CL_READ | CL_COMMIT | CL_AGE | bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg);
issued_io = 1;
}
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)
{
int retval;
+ int my_sparse_wait = 0;
struct cl_writebehind *wbp;
if ( !UBCINFOEXISTS(vp)) {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_NONE, (int)vp, flags, 0, -1, 0);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_NONE, vp, flags, 0, -1, 0);
return (0);
}
/* return if deferred write is set */
return (0);
}
if ((wbp = cluster_get_wbp(vp, CLW_RETURNLOCKED)) == NULL) {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_NONE, (int)vp, flags, 0, -2, 0);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_NONE, vp, flags, 0, -2, 0);
return (0);
}
if (wbp->cl_number == 0 && wbp->cl_scmap == NULL) {
lck_mtx_unlock(&wbp->cl_lockw);
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_NONE, (int)vp, flags, 0, -3, 0);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_NONE, vp, flags, 0, -3, 0);
return(0);
}
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_START,
- (int)wbp->cl_scmap, wbp->cl_number, flags, 0, 0);
+ 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, 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, 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, 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, vp, 0, 0, 0, 0);
+ }
+ }
if (wbp->cl_scmap) {
- sparse_cluster_push(wbp, vp, ubc_getsize(vp), 1);
+ void *scmap;
- retval = 1;
- } else
- retval = cluster_try_push(wbp, vp, ubc_getsize(vp), 0, 1);
+ 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);
+ sparse_cluster_push(&scmap, vp, ubc_getsize(vp), PUSH_ALL, flags | IO_PASSIVE, 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 {
+ sparse_cluster_push(&(wbp->cl_scmap), vp, ubc_getsize(vp), PUSH_ALL, flags | IO_PASSIVE, callback, callback_arg);
+ }
+ retval = 1;
+ } else {
+ retval = cluster_try_push(wbp, vp, ubc_getsize(vp), PUSH_ALL, flags | IO_PASSIVE, callback, callback_arg);
+ }
lck_mtx_unlock(&wbp->cl_lockw);
if (flags & IO_SYNC)
- (void)vnode_waitforwrites(vp, 0, 0, 0, (char *)"cluster_push");
+ (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,
- (int)wbp->cl_scmap, wbp->cl_number, retval, 0, 0);
+ wbp->cl_scmap, wbp->cl_number, retval, 0, 0);
return (retval);
}
if ((wbp = ubc->cl_wbehind)) {
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 81)) | DBG_FUNC_START, (int)ubc, (int)wbp->cl_scmap, wbp->cl_scdirty, 0, 0);
+ 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, (int)ubc, 0, 0, 0, 0);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 81)) | DBG_FUNC_START, ubc, 0, 0, 0, 0);
}
rap = ubc->cl_rahead;
ubc->cl_rahead = NULL;
ubc->cl_wbehind = NULL;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 81)) | DBG_FUNC_END, (int)ubc, (int)rap, (int)wbp, 0, 0);
-}
-
-
-static void
-cluster_push_EOF(vnode_t vp, off_t EOF)
-{
- struct cl_writebehind *wbp;
-
- wbp = cluster_get_wbp(vp, CLW_ALLOCATE | CLW_RETURNLOCKED);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_START,
- (int)wbp->cl_scmap, wbp->cl_number, (int)EOF, 0, 0);
-
- if (wbp->cl_scmap)
- sparse_cluster_push(wbp, vp, EOF, 1);
- else
- cluster_try_push(wbp, vp, EOF, 0, 1);
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_END,
- (int)wbp->cl_scmap, wbp->cl_number, 0, 0, 0);
-
- lck_mtx_unlock(&wbp->cl_lockw);
+ 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 can_delay, int push_all)
+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 cl_index;
int cl_index1;
int cl_len;
int cl_pushed = 0;
struct cl_wextent l_clusters[MAX_CLUSTERS];
+ u_int max_cluster_pgcount;
+
+ 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
}
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_nocache = wbp->cl_clusters[min_index].io_nocache;
+ 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;
}
cl_len = cl_index;
- if (can_delay && cl_len == MAX_CLUSTERS) {
+ if ( (push_flag & PUSH_DELAY) && cl_len == MAX_CLUSTERS ) {
int i;
/*
* 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 can_delay true...
+ * 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
* 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_UPL_TRANSFER)
+ 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;
}
}
- /*
- * drop the lock while we're firing off the I/Os...
- * this is safe since I'm working off of a private sorted copy
- * of the clusters, and I'm going to re-evaluate the public
- * state after I retake the lock
- */
- lck_mtx_unlock(&wbp->cl_lockw);
-
for (cl_index = 0; cl_index < cl_len; cl_index++) {
- int flags;
- struct cl_extent cl;
+ int flags;
+ struct cl_extent cl;
+
+ flags = io_flags & (IO_PASSIVE|IO_CLOSE);
/*
* try to push each cluster in turn...
*/
- if (l_clusters[cl_index].io_nocache)
- flags = IO_NOCACHE;
- else
- flags = 0;
+ 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;
- cluster_push_x(vp, &cl, EOF, flags);
+ cluster_push_now(vp, &cl, EOF, flags, callback, callback_arg);
l_clusters[cl_index].b_addr = 0;
l_clusters[cl_index].e_addr = 0;
cl_pushed++;
- if (push_all == 0)
+ if ( !(push_flag & PUSH_ALL) )
break;
}
- lck_mtx_lock(&wbp->cl_lockw);
-
dont_try:
if (cl_len > cl_pushed) {
/*
*
* collect the active public clusters...
*/
- sparse_cluster_switch(wbp, vp, EOF);
+ 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_nocache = l_clusters[cl_index].io_nocache;
+ wbp->cl_clusters[cl_index1].io_flags = l_clusters[cl_index].io_flags;
cl_index1++;
}
* and collect the original clusters that were moved into the
* local storage for sorting purposes
*/
- sparse_cluster_switch(wbp, vp, EOF);
+ sparse_cluster_switch(wbp, vp, EOF, callback, callback_arg);
} else {
/*
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_nocache = l_clusters[cl_index].io_nocache;
+ wbp->cl_clusters[cl_index1].io_flags = l_clusters[cl_index].io_flags;
cl_index1++;
}
wbp->cl_number = cl_index1;
}
}
- return(MAX_CLUSTERS - wbp->cl_number);
+ return (MAX_CLUSTERS - wbp->cl_number);
}
static int
-cluster_push_x(vnode_t vp, struct cl_extent *cl, off_t EOF, int flags)
+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;
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;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_START,
(int)cl->b_addr, (int)cl->e_addr, (int)EOF, flags, 0);
if (kret != KERN_SUCCESS)
panic("cluster_push: failed to get pagelist");
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_END, (int)upl, upl_f_offset, 0, 0, 0);
+ 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
io_size = min(size, (last_pg - start_pg) * PAGE_SIZE);
- io_flags = CL_THROTTLE | CL_COMMIT;
+ 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);
+ io_flags, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg);
if (error == 0 && retval)
error = retval;
* 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)
+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, (int)vp, (int)wbp->cl_scmap, wbp->cl_scdirty, 0, 0);
-
- if (wbp->cl_scmap == NULL)
- wbp->cl_scdirty = 0;
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 78)) | DBG_FUNC_START, vp, wbp->cl_scmap, 0, 0, 0);
for (cl_index = 0; cl_index < wbp->cl_number; cl_index++) {
int flags;
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, 0, &flags) == KERN_SUCCESS) {
+ 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, vp, &cl, EOF);
+ 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, (int)vp, (int)wbp->cl_scmap, wbp->cl_scdirty, 0, 0);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 78)) | DBG_FUNC_END, vp, wbp->cl_scmap, 0, 0, 0);
}
/*
- * sparse_cluster_push is called with the write behind lock held
+ * 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 void
-sparse_cluster_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int push_all)
+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;
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 79)) | DBG_FUNC_START, (int)vp, (int)wbp->cl_scmap, wbp->cl_scdirty, push_all, 0);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 79)) | DBG_FUNC_START, vp, (*scmap), 0, push_flag, 0);
- if (push_all)
- vfs_drt_control(&(wbp->cl_scmap), 1);
+ if (push_flag & PUSH_ALL)
+ vfs_drt_control(scmap, 1);
for (;;) {
- if (vfs_drt_get_cluster(&(wbp->cl_scmap), &offset, &length) != KERN_SUCCESS)
+ 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);
- wbp->cl_scdirty -= (int)(cl.e_addr - cl.b_addr);
+ cluster_push_now(vp, &cl, EOF, io_flags & (IO_PASSIVE|IO_CLOSE), callback, callback_arg);
- cluster_push_x(vp, &cl, EOF, 0);
-
- if (push_all == 0)
+ if ( !(push_flag & PUSH_ALL) )
break;
}
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 79)) | DBG_FUNC_END, (int)vp, (int)wbp->cl_scmap, wbp->cl_scdirty, 0, 0);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 79)) | DBG_FUNC_END, vp, (*scmap), 0, 0, 0);
}
* sparse_cluster_add is called with the write behind lock held
*/
static void
-sparse_cluster_add(struct cl_writebehind *wbp, vnode_t vp, struct cl_extent *cl, off_t EOF)
+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, (int)wbp->cl_scmap, wbp->cl_scdirty, (int)cl->b_addr, (int)cl->e_addr, 0);
+ 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(&(wbp->cl_scmap), offset, length, &new_dirty) != KERN_SUCCESS) {
+ 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
*/
- wbp->cl_scdirty += new_dirty;
-
- sparse_cluster_push(wbp, vp, EOF, 0);
+ sparse_cluster_push(scmap, vp, EOF, 0, 0, callback, callback_arg);
offset += (new_dirty * PAGE_SIZE_64);
length -= (new_dirty * PAGE_SIZE);
}
- wbp->cl_scdirty += new_dirty;
-
- KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 80)) | DBG_FUNC_END, (int)vp, (int)wbp->cl_scmap, wbp->cl_scdirty, 0, 0);
+ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 80)) | DBG_FUNC_END, vp, (*scmap), 0, 0, 0);
}
static int
-cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, int xsize, int flags)
+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;
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)) {
+
+ 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,
* issue a synchronous read to cluster_io
*/
error = cluster_io(vp, upl, 0, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE,
- CL_READ, (buf_t)NULL, (struct clios *)NULL);
+ 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);
* issue a synchronous write to cluster_io
*/
error = cluster_io(vp, upl, 0, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE,
- 0, (buf_t)NULL, (struct clios *)NULL);
+ bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg);
}
- if (error == 0)
+ if (error == 0)
uio_update(uio, (user_size_t)xsize);
if (did_read)
int
-cluster_copy_upl_data(struct uio *uio, upl_t upl, int upl_offset, int xsize)
+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;
+ xsize = *io_resid;
+
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_START,
- (int)uio->uio_offset, uio_resid(uio), upl_offset, xsize, 0);
+ (int)uio->uio_offset, upl_offset, xsize, 0, 0);
segflg = uio->uio_segflg;
uio->uio_segflg = UIO_PHYS_USERSPACE64;
break;
- case UIO_SYSSPACE32:
- uio->uio_segflg = UIO_PHYS_SYSSPACE32;
- break;
-
case UIO_SYSSPACE:
uio->uio_segflg = UIO_PHYS_SYSSPACE;
break;
- case UIO_SYSSPACE64:
- uio->uio_segflg = UIO_PHYS_SYSSPACE64;
- break;
}
pl = ubc_upl_pageinfo(upl);
xsize -= csize;
csize = min(PAGE_SIZE, xsize);
}
+ *io_resid = xsize;
+
uio->uio_segflg = segflg;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END,
- (int)uio->uio_offset, uio_resid(uio), retval, segflg, 0);
+ (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 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, uio_resid(uio), 0, *io_resid, 0);
+ (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, uio_resid(uio), retval, 3, 0);
+ (int)uio->uio_offset, io_size, retval, 3, 0);
return(0);
}
uio->uio_segflg = UIO_PHYS_USERSPACE64;
break;
- case UIO_SYSSPACE32:
- uio->uio_segflg = UIO_PHYS_SYSSPACE32;
- break;
-
- case UIO_SYSSPACE64:
- uio->uio_segflg = UIO_PHYS_SYSSPACE64;
- break;
-
case UIO_USERSPACE:
case UIO_USERISPACE:
uio->uio_segflg = UIO_PHYS_USERSPACE;
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);
+ 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;
}
*io_resid = io_size;
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END,
- (int)uio->uio_offset, uio_resid(uio), retval, 0x80000000 | segflg, 0);
+ (int)uio->uio_offset, io_size, retval, 0x80000000 | segflg, 0);
return(retval);
}
int total_dirty = 0;
for (f_offset = 0; f_offset < filesize; f_offset += PAGE_SIZE_64) {
- if (ubc_page_op(vp, f_offset, 0, 0, &flags) == KERN_SUCCESS) {
+ if (ubc_page_op(vp, f_offset, 0, NULL, &flags) == KERN_SUCCESS) {
if (flags & UPL_POP_DIRTY) {
total_dirty++;
}
#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 */
void **cmapp,
u_int64_t offset,
u_int length,
- int *setcountp,
+ u_int *setcountp,
int dirty);
static void vfs_drt_trace(
struct vfs_drt_clustermap *cmap,
struct vfs_drt_clustermap *cmap, *ocmap;
kern_return_t kret;
u_int64_t offset;
- int nsize, i, active_buckets, index, copycount;
+ u_int32_t i;
+ int nsize, active_buckets, index, copycount;
ocmap = NULL;
if (cmapp != NULL)
* see whether we should grow to the large one.
*/
if (ocmap->scm_modulus == DRT_HASH_SMALL_MODULUS) {
- /* if the ring is nearly full */
- if (active_buckets > (DRT_HASH_SMALL_MODULUS - 5)) {
+ /*
+ * 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;
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);
static kern_return_t
vfs_drt_search_index(struct vfs_drt_clustermap *cmap, u_int64_t offset, int *indexp)
{
- int index, i;
+ int index;
+ u_int32_t i;
offset = DRT_ALIGN_ADDRESS(offset);
index = DRT_HASH(cmap, offset);
{
struct vfs_drt_clustermap *cmap;
kern_return_t kret;
- int index, i;
+ u_int32_t index;
+ u_int32_t i;
cmap = *cmapp;
void **private,
u_int64_t offset,
u_int length,
- int *setcountp,
+ u_int *setcountp,
int dirty)
{
struct vfs_drt_clustermap *cmap, **cmapp;
* 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, int *setcountp)
+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));
struct vfs_drt_clustermap *cmap;
u_int64_t offset;
u_int length;
- int index, i, j, fs, ls;
+ u_int32_t j;
+ int index, i, fs, ls;
/* sanity */
if ((cmapp == NULL) || (*cmapp == NULL))
projects / apple / xnu.git / blobdiff