/*
- * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2020 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
-/*
+/*
* Mach Operating System
* Copyright (c) 1987 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
#include <sys/uio.h>
#include <sys/vnode_internal.h>
#include <sys/namei.h>
-#include <sys/mount_internal.h> /* needs internal due to fhandle_t */
+#include <sys/mount_internal.h> /* needs internal due to fhandle_t */
#include <sys/ubc_internal.h>
#include <sys/lock.h>
-#include <sys/disk.h> /* For DKIOC calls */
+#include <sys/disk.h> /* For DKIOC calls */
#include <mach/mach_types.h>
#include <mach/memory_object_types.h>
-#include <mach/memory_object_control.h>
#include <mach/vm_map.h>
#include <mach/mach_vm.h>
#include <mach/upl.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <kern/zalloc.h>
-#include <kern/kalloc.h>
#include <libkern/libkern.h>
#include <vm/vnode_pager.h>
#include <kern/assert.h>
#include <sys/kdebug.h>
-#include <machine/spl.h>
-
+#include <nfs/nfs_conf.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <vm/vm_protos.h>
+#include <vfs/vfs_disk_conditioner.h>
void
-vnode_pager_throttle()
+vnode_pager_throttle(void)
{
struct uthread *ut;
ut = get_bsdthread_info(current_thread());
- if (ut->uu_lowpri_window)
- throttle_lowpri_io(TRUE);
+ if (ut->uu_lowpri_window) {
+ throttle_lowpri_io(1);
+ }
}
-
boolean_t
vnode_pager_isSSD(vnode_t vp)
{
- if (vp->v_mount->mnt_kern_flag & MNTK_SSD)
- return (TRUE);
- return (FALSE);
+ return disk_conditioner_mount_is_ssd(vp->v_mount);
}
+#if CONFIG_IOSCHED
+void
+vnode_pager_issue_reprioritize_io(struct vnode *devvp, uint64_t blkno, uint32_t len, int priority)
+{
+ u_int32_t blocksize = 0;
+ dk_extent_t extent;
+ dk_set_tier_t set_tier;
+ int error = 0;
+
+ error = VNOP_IOCTL(devvp, DKIOCGETBLOCKSIZE, (caddr_t)&blocksize, 0, vfs_context_kernel());
+ if (error) {
+ return;
+ }
+
+ memset(&extent, 0, sizeof(dk_extent_t));
+ memset(&set_tier, 0, sizeof(dk_set_tier_t));
+
+ extent.offset = blkno * (u_int64_t) blocksize;
+ extent.length = len;
+
+ set_tier.extents = &extent;
+ set_tier.extentsCount = 1;
+ set_tier.tier = (uint8_t)priority;
+
+ error = VNOP_IOCTL(devvp, DKIOCSETTIER, (caddr_t)&set_tier, 0, vfs_context_kernel());
+ return;
+}
+#endif
+
+void
+vnode_pager_was_dirtied(
+ struct vnode *vp,
+ vm_object_offset_t s_offset,
+ vm_object_offset_t e_offset)
+{
+ cluster_update_state(vp, s_offset, e_offset, TRUE);
+}
uint32_t
vnode_pager_isinuse(struct vnode *vp)
{
- if (vp->v_usecount > vp->v_kusecount)
- return (1);
- return (0);
+ if (vp->v_usecount > vp->v_kusecount) {
+ return 1;
+ }
+ return 0;
}
uint32_t
-vnode_pager_return_hard_throttle_limit(struct vnode *vp, uint32_t *limit, uint32_t hard_throttle)
+vnode_pager_return_throttle_io_limit(struct vnode *vp, uint32_t *limit)
{
- return(cluster_hard_throttle_limit(vp, limit, hard_throttle));
+ return cluster_throttle_io_limit(vp, limit);
}
vm_object_offset_t
vnode_pager_get_filesize(struct vnode *vp)
{
-
return (vm_object_offset_t) ubc_getsize(vp);
}
+extern int safe_getpath(struct vnode *dvp, char *leafname, char *path, int _len, int *truncated_path);
+
kern_return_t
-vnode_pager_get_pathname(
- struct vnode *vp,
- char *pathname,
- vm_size_t *length_p)
+vnode_pager_get_name(
+ struct vnode *vp,
+ char *pathname,
+ vm_size_t pathname_len,
+ char *filename,
+ vm_size_t filename_len,
+ boolean_t *truncated_path_p)
{
- int error, len;
-
- len = (int) *length_p;
- error = vn_getpath(vp, pathname, &len);
- if (error != 0) {
- return KERN_FAILURE;
+ *truncated_path_p = FALSE;
+ if (pathname != NULL) {
+ /* get the path name */
+ safe_getpath(vp, NULL,
+ pathname, (int) pathname_len,
+ truncated_path_p);
+ }
+ if ((pathname == NULL || *truncated_path_p) &&
+ filename != NULL) {
+ /* get the file name */
+ const char *name;
+
+ name = vnode_getname_printable(vp);
+ strlcpy(filename, name, (size_t) filename_len);
+ vnode_putname_printable(name);
}
- *length_p = (vm_size_t) len;
return KERN_SUCCESS;
}
kern_return_t
-vnode_pager_get_filename(
- struct vnode *vp,
- const char **filename)
+vnode_pager_get_mtime(
+ struct vnode *vp,
+ struct timespec *current_mtime,
+ struct timespec *cs_mtime)
{
- *filename = vp->v_name;
+ vnode_mtime(vp, current_mtime, vfs_context_current());
+ if (cs_mtime != NULL) {
+ ubc_get_cs_mtime(vp, cs_mtime);
+ }
return KERN_SUCCESS;
}
kern_return_t
vnode_pager_get_cs_blobs(
- struct vnode *vp,
- void **blobs)
+ struct vnode *vp,
+ void **blobs)
{
*blobs = ubc_get_cs_blobs(vp);
return KERN_SUCCESS;
}
-/*
+/*
* vnode_trim:
* Used to call the DKIOCUNMAP ioctl on the underlying disk device for the specified vnode.
* Trims the region at offset bytes into the file, for length bytes.
* This function is non-idempotent in error cases; We cannot un-discard the blocks if only some of them
* are successfully discarded.
*/
-u_int32_t vnode_trim (
- struct vnode *vp,
- off_t offset,
- size_t length)
+u_int32_t
+vnode_trim(
+ struct vnode *vp,
+ off_t offset,
+ size_t length)
{
- daddr64_t io_blockno; /* Block number corresponding to the start of the extent */
- size_t io_bytecount; /* Number of bytes in current extent for the specified range */
+ daddr64_t io_blockno; /* Block number corresponding to the start of the extent */
+ size_t io_bytecount; /* Number of bytes in current extent for the specified range */
size_t trimmed = 0;
- off_t current_offset = offset;
+ off_t current_offset = offset;
size_t remaining_length = length;
int error = 0;
u_int32_t blocksize = 0;
goto trim_exit;
}
- /*
+ /*
* We may not get the entire range from offset -> offset+length in a single
* extent from the blockmap call. Keep looping/going until we are sure we've hit
* the whole range or if we encounter an error.
while (trimmed < length) {
/*
* VNOP_BLOCKMAP will tell us the logical to physical block number mapping for the
- * specified offset. It returns blocks in contiguous chunks, so if the logical range is
+ * specified offset. It returns blocks in contiguous chunks, so if the logical range is
* broken into multiple extents, it must be called multiple times, increasing the offset
* in each call to ensure that the entire range is covered.
*/
- error = VNOP_BLOCKMAP (vp, current_offset, remaining_length,
- &io_blockno, &io_bytecount, NULL, VNODE_READ, NULL);
+ error = VNOP_BLOCKMAP(vp, current_offset, remaining_length,
+ &io_blockno, &io_bytecount, NULL, VNODE_READ | VNODE_BLOCKMAP_NO_TRACK, NULL);
if (error) {
goto trim_exit;
}
- /*
+ /*
* We have a contiguous run. Prepare & issue the ioctl for the device.
* the DKIOCUNMAP ioctl takes offset in bytes from the start of the device.
*/
- memset (&extent, 0, sizeof(dk_extent_t));
- memset (&unmap, 0, sizeof(dk_unmap_t));
+ memset(&extent, 0, sizeof(dk_extent_t));
+ memset(&unmap, 0, sizeof(dk_unmap_t));
extent.offset = (uint64_t) io_blockno * (u_int64_t) blocksize;
extent.length = io_bytecount;
unmap.extents = &extent;
trim_exit:
return error;
-
}
pager_return_t
vnode_pageout(struct vnode *vp,
- upl_t upl,
- upl_offset_t upl_offset,
- vm_object_offset_t f_offset,
- upl_size_t size,
- int flags,
- int *errorp)
+ upl_t upl,
+ upl_offset_t upl_offset,
+ vm_object_offset_t f_offset,
+ upl_size_t size,
+ int flags,
+ int *errorp)
{
- int result = PAGER_SUCCESS;
- int error = 0;
- int error_ret = 0;
+ int result = PAGER_SUCCESS;
+ int error = 0;
+ int error_ret = 0;
daddr64_t blkno;
int isize;
int pg_index;
int base_index;
upl_offset_t offset;
upl_page_info_t *pl;
- vfs_context_t ctx = vfs_context_current(); /* pager context */
+ vfs_context_t ctx = vfs_context_current(); /* pager context */
isize = (int)size;
+ /*
+ * This call is non-blocking and does not ever fail but it can
+ * only be made when there is other explicit synchronization
+ * with reclaiming of the vnode which, in this path, is provided
+ * by the paging in progress counter.
+ *
+ * In addition, this may also be entered via explicit ubc_msync
+ * calls or vm_swapfile_io where the existing iocount provides
+ * the necessary synchronization. Ideally we would not take an
+ * additional iocount here in the cases where an explcit iocount
+ * has already been taken but this call doesn't cause a deadlock
+ * as other forms of vnode_get* might if this thread has already
+ * taken an iocount.
+ */
+ error = vnode_getalways_from_pager(vp);
+ if (error != 0) {
+ /* This can't happen */
+ panic("vnode_getalways returned %d for vp %p", error, vp);
+ }
+
if (isize <= 0) {
- result = PAGER_ERROR;
+ result = PAGER_ERROR;
error_ret = EINVAL;
goto out;
}
result = PAGER_ERROR;
error_ret = EINVAL;
- if (upl && !(flags & UPL_NOCOMMIT))
- ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY);
+ if (upl && !(flags & UPL_NOCOMMIT)) {
+ ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY);
+ }
goto out;
}
- if ( !(flags & UPL_VNODE_PAGER)) {
+ if (!(flags & UPL_VNODE_PAGER)) {
/*
* This is a pageout from the default pager,
* just go ahead and call vnop_pageout since
* it has already sorted out the dirty ranges
*/
- KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START,
- size, 1, 0, 0, 0);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START,
+ size, 1, 0, 0, 0);
- if ( (error_ret = VNOP_PAGEOUT(vp, upl, upl_offset, (off_t)f_offset,
- (size_t)size, flags, ctx)) )
+ if ((error_ret = VNOP_PAGEOUT(vp, upl, upl_offset, (off_t)f_offset,
+ (size_t)size, flags, ctx))) {
result = PAGER_ERROR;
+ }
- KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END,
- size, 1, 0, 0, 0);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END,
+ size, 1, 0, 0, 0);
goto out;
}
if (upl == NULL) {
- int request_flags;
+ int request_flags;
if (vp->v_mount->mnt_vtable->vfc_vfsflags & VFC_VFSVNOP_PAGEOUTV2) {
/*
* via 'f_offset' and 'size' into a UPL... this allows the filesystem to first
* take any locks it needs, before effectively locking the pages into a UPL...
*/
- KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START,
- size, (int)f_offset, 0, 0, 0);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START,
+ size, (int)f_offset, 0, 0, 0);
- if ( (error_ret = VNOP_PAGEOUT(vp, NULL, upl_offset, (off_t)f_offset,
- size, flags, ctx)) ) {
+ if ((error_ret = VNOP_PAGEOUT(vp, NULL, upl_offset, (off_t)f_offset,
+ size, flags, ctx))) {
result = PAGER_ERROR;
}
- KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END,
- size, 0, 0, 0, 0);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END,
+ size, 0, 0, 0, 0);
goto out;
}
- if (flags & UPL_MSYNC)
+ if (flags & UPL_MSYNC) {
request_flags = UPL_UBC_MSYNC | UPL_RET_ONLY_DIRTY;
- else
+ } else {
request_flags = UPL_UBC_PAGEOUT | UPL_RET_ONLY_DIRTY;
-
- if (ubc_create_upl(vp, f_offset, size, &upl, &pl, request_flags) != KERN_SUCCESS) {
+ }
+
+ if (ubc_create_upl_kernel(vp, f_offset, size, &upl, &pl, request_flags, VM_KERN_MEMORY_FILE) != KERN_SUCCESS) {
result = PAGER_ERROR;
error_ret = EINVAL;
goto out;
}
upl_offset = 0;
- } else
+ } else {
pl = ubc_upl_pageinfo(upl);
+ }
+
+ /*
+ * Ignore any non-present pages at the end of the
+ * UPL so that we aren't looking at a upl that
+ * may already have been freed by the preceeding
+ * aborts/completions.
+ */
+ base_index = upl_offset / PAGE_SIZE;
+
+ for (pg_index = (upl_offset + isize) / PAGE_SIZE; pg_index > base_index;) {
+ if (upl_page_present(pl, --pg_index)) {
+ break;
+ }
+ if (pg_index == base_index) {
+ /*
+ * no pages were returned, so release
+ * our hold on the upl and leave
+ */
+ if (!(flags & UPL_NOCOMMIT)) {
+ ubc_upl_abort_range(upl, upl_offset, isize, UPL_ABORT_FREE_ON_EMPTY);
+ }
+
+ goto out;
+ }
+ }
+ isize = ((pg_index + 1) - base_index) * PAGE_SIZE;
/*
* we come here for pageouts to 'real' files and
* through it and find the 'runs' of dirty pages
* to call VNOP_PAGEOUT on...
*/
+
if (ubc_getsize(vp) == 0) {
- /*
+ /*
* if the file has been effectively deleted, then
* we need to go through the UPL and invalidate any
* buffer headers we might have that reference any
* of it's pages
*/
for (offset = upl_offset; isize; isize -= PAGE_SIZE, offset += PAGE_SIZE) {
-#if NFSCLIENT
- if (vp->v_tag == VT_NFS)
+#if CONFIG_NFS_CLIENT
+ if (vp->v_tag == VT_NFS) {
/* check with nfs if page is OK to drop */
error = nfs_buf_page_inval(vp, (off_t)f_offset);
- else
-#endif
+ } else
+#endif /* CONFIG_NFS_CLIENT */
{
- blkno = ubc_offtoblk(vp, (off_t)f_offset);
- error = buf_invalblkno(vp, blkno, 0);
+ blkno = ubc_offtoblk(vp, (off_t)f_offset);
+ error = buf_invalblkno(vp, blkno, 0);
}
if (error) {
- if ( !(flags & UPL_NOCOMMIT))
- ubc_upl_abort_range(upl, offset, PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY);
- if (error_ret == 0)
- error_ret = error;
+ if (!(flags & UPL_NOCOMMIT)) {
+ ubc_upl_abort_range(upl, offset, PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY);
+ }
+ if (error_ret == 0) {
+ error_ret = error;
+ }
result = PAGER_ERROR;
-
- } else if ( !(flags & UPL_NOCOMMIT)) {
- ubc_upl_commit_range(upl, offset, PAGE_SIZE, UPL_COMMIT_FREE_ON_EMPTY);
+ } else if (!(flags & UPL_NOCOMMIT)) {
+ ubc_upl_commit_range(upl, offset, PAGE_SIZE, UPL_COMMIT_FREE_ON_EMPTY);
}
f_offset += PAGE_SIZE;
}
goto out;
}
- /*
- * Ignore any non-present pages at the end of the
- * UPL so that we aren't looking at a upl that
- * may already have been freed by the preceeding
- * aborts/completions.
- */
- base_index = upl_offset / PAGE_SIZE;
-
- for (pg_index = (upl_offset + isize) / PAGE_SIZE; pg_index > base_index;) {
- if (upl_page_present(pl, --pg_index))
- break;
- if (pg_index == base_index) {
- /*
- * no pages were returned, so release
- * our hold on the upl and leave
- */
- if ( !(flags & UPL_NOCOMMIT))
- ubc_upl_abort_range(upl, upl_offset, isize, UPL_ABORT_FREE_ON_EMPTY);
-
- goto out;
- }
- }
- isize = ((pg_index + 1) - base_index) * PAGE_SIZE;
offset = upl_offset;
pg_index = base_index;
int xsize;
int num_of_pages;
- if ( !upl_page_present(pl, pg_index)) {
- /*
+ if (!upl_page_present(pl, pg_index)) {
+ /*
* we asked for RET_ONLY_DIRTY, so it's possible
* to get back empty slots in the UPL
* just skip over them
*/
- f_offset += PAGE_SIZE;
+ f_offset += PAGE_SIZE;
offset += PAGE_SIZE;
isize -= PAGE_SIZE;
pg_index++;
continue;
}
- if ( !upl_dirty_page(pl, pg_index)) {
+ if (!upl_dirty_page(pl, pg_index)) {
/*
* if the page is not dirty and reached here it is
* marked precious or it is due to invalidation in
* Note we must not sleep here if the buffer is busy - that is
* a lock inversion which causes deadlock.
*/
-#if NFSCLIENT
- if (vp->v_tag == VT_NFS)
+#if CONFIG_NFS_CLIENT
+ if (vp->v_tag == VT_NFS) {
/* check with nfs if page is OK to drop */
error = nfs_buf_page_inval(vp, (off_t)f_offset);
- else
-#endif
+ } else
+#endif /* CONFIG_NFS_CLIENT */
{
- blkno = ubc_offtoblk(vp, (off_t)f_offset);
- error = buf_invalblkno(vp, blkno, 0);
+ blkno = ubc_offtoblk(vp, (off_t)f_offset);
+ error = buf_invalblkno(vp, blkno, 0);
}
if (error) {
- if ( !(flags & UPL_NOCOMMIT))
- ubc_upl_abort_range(upl, offset, PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY);
- if (error_ret == 0)
- error_ret = error;
+ if (!(flags & UPL_NOCOMMIT)) {
+ ubc_upl_abort_range(upl, offset, PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY);
+ }
+ if (error_ret == 0) {
+ error_ret = error;
+ }
result = PAGER_ERROR;
-
- } else if ( !(flags & UPL_NOCOMMIT)) {
- ubc_upl_commit_range(upl, offset, PAGE_SIZE, UPL_COMMIT_FREE_ON_EMPTY);
+ } else if (!(flags & UPL_NOCOMMIT)) {
+ ubc_upl_commit_range(upl, offset, PAGE_SIZE, UPL_COMMIT_FREE_ON_EMPTY);
}
- f_offset += PAGE_SIZE;
+ f_offset += PAGE_SIZE;
offset += PAGE_SIZE;
isize -= PAGE_SIZE;
pg_index++;
xsize = isize - PAGE_SIZE;
while (xsize) {
- if ( !upl_dirty_page(pl, pg_index + num_of_pages))
+ if (!upl_dirty_page(pl, pg_index + num_of_pages)) {
break;
+ }
num_of_pages++;
xsize -= PAGE_SIZE;
}
xsize = num_of_pages * PAGE_SIZE;
- KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START,
- xsize, (int)f_offset, 0, 0, 0);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START,
+ xsize, (int)f_offset, 0, 0, 0);
- if ( (error = VNOP_PAGEOUT(vp, upl, offset, (off_t)f_offset,
- xsize, flags, ctx)) ) {
- if (error_ret == 0)
- error_ret = error;
+ if ((error = VNOP_PAGEOUT(vp, upl, offset, (off_t)f_offset,
+ xsize, flags, ctx))) {
+ if (error_ret == 0) {
+ error_ret = error;
+ }
result = PAGER_ERROR;
}
- KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END,
- xsize, 0, 0, 0, 0);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END,
+ xsize, 0, 0, 0, 0);
- f_offset += xsize;
+ f_offset += xsize;
offset += xsize;
isize -= xsize;
pg_index += num_of_pages;
}
out:
- if (errorp)
+ vnode_put_from_pager(vp);
+
+ if (errorp) {
*errorp = error_ret;
+ }
- return (result);
+ return result;
}
pager_return_t
vnode_pagein(
- struct vnode *vp,
- upl_t upl,
- upl_offset_t upl_offset,
- vm_object_offset_t f_offset,
- upl_size_t size,
- int flags,
- int *errorp)
+ struct vnode *vp,
+ upl_t upl,
+ upl_offset_t upl_offset,
+ vm_object_offset_t f_offset,
+ upl_size_t size,
+ int flags,
+ int *errorp)
{
- struct uthread *ut;
- upl_page_info_t *pl;
- int result = PAGER_SUCCESS;
- int error = 0;
- int pages_in_upl;
- int start_pg;
- int last_pg;
+ upl_page_info_t *pl;
+ int result = PAGER_SUCCESS;
+ int error = 0;
+ int pages_in_upl;
+ int start_pg;
+ int last_pg;
int first_pg;
- int xsize;
- int must_commit = 1;
+ int xsize;
+ int must_commit = 1;
+ int ignore_valid_page_check = 0;
+
+ if (flags & UPL_NOCOMMIT) {
+ must_commit = 0;
+ }
+
+ if (flags & UPL_IGNORE_VALID_PAGE_CHECK) {
+ ignore_valid_page_check = 1;
+ }
- if (flags & UPL_NOCOMMIT)
- must_commit = 0;
+ /*
+ * This call is non-blocking and does not ever fail but it can
+ * only be made when there is other explicit synchronization
+ * with reclaiming of the vnode which, in this path, is provided
+ * by the paging in progress counter.
+ *
+ * In addition, this may also be entered via vm_swapfile_io
+ * where the existing iocount provides the necessary synchronization.
+ * Ideally we would not take an additional iocount here in the cases
+ * where an explcit iocount has already been taken but this call
+ * doesn't cause a deadlock as other forms of vnode_get* might if
+ * this thread has already taken an iocount.
+ */
+ error = vnode_getalways_from_pager(vp);
+ if (error != 0) {
+ /* This can't happen */
+ panic("vnode_getalways returned %d for vp %p", error, vp);
+ }
if (UBCINFOEXISTS(vp) == 0) {
result = PAGER_ERROR;
error = PAGER_ERROR;
- if (upl && must_commit)
+ if (upl && must_commit) {
ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR);
+ }
goto out;
}
if (upl == (upl_t)NULL) {
flags &= ~UPL_NOCOMMIT;
- if (size > (MAX_UPL_SIZE * PAGE_SIZE)) {
- result = PAGER_ERROR;
+ if (size > MAX_UPL_SIZE_BYTES) {
+ result = PAGER_ERROR;
error = PAGER_ERROR;
goto out;
}
* take any locks it needs, before effectively locking the pages into a UPL...
* so we pass a NULL into the filesystem instead of a UPL pointer... the 'upl_offset'
* is used to identify the "must have" page in the extent... the filesystem is free
- * to clip the extent to better fit the underlying FS blocksize if it desires as
+ * to clip the extent to better fit the underlying FS blocksize if it desires as
* long as it continues to include the "must have" page... 'f_offset' + 'upl_offset'
* identifies that page
*/
- if ( (error = VNOP_PAGEIN(vp, NULL, upl_offset, (off_t)f_offset,
- size, flags, vfs_context_current())) ) {
+ if ((error = VNOP_PAGEIN(vp, NULL, upl_offset, (off_t)f_offset,
+ size, flags, vfs_context_current()))) {
+ set_thread_pagein_error(current_thread(), error);
result = PAGER_ERROR;
error = PAGER_ERROR;
}
goto out;
}
- ubc_create_upl(vp, f_offset, size, &upl, &pl, UPL_UBC_PAGEIN | UPL_RET_ONLY_ABSENT);
+ ubc_create_upl_kernel(vp, f_offset, size, &upl, &pl, UPL_UBC_PAGEIN | UPL_RET_ONLY_ABSENT, VM_KERN_MEMORY_FILE);
if (upl == (upl_t)NULL) {
- result = PAGER_ABSENT;
+ result = PAGER_ABSENT;
error = PAGER_ABSENT;
goto out;
}
+ ubc_upl_range_needed(upl, upl_offset / PAGE_SIZE, 1);
+
upl_offset = 0;
first_pg = 0;
-
+
/*
* if we get here, we've created the upl and
* are responsible for commiting/aborting it
*/
must_commit = 1;
} else {
- pl = ubc_upl_pageinfo(upl);
+ pl = ubc_upl_pageinfo(upl);
first_pg = upl_offset / PAGE_SIZE;
}
pages_in_upl = size / PAGE_SIZE;
DTRACE_VM2(pgpgin, int, pages_in_upl, (uint64_t *), NULL);
/*
- * before we start marching forward, we must make sure we end on
+ * before we start marching forward, we must make sure we end on
* a present page, otherwise we will be working with a freed
- * upl
+ * upl
*/
for (last_pg = pages_in_upl - 1; last_pg >= first_pg; last_pg--) {
- if (upl_page_present(pl, last_pg))
+ if (upl_page_present(pl, last_pg)) {
break;
+ }
if (last_pg == first_pg) {
- /*
+ /*
* empty UPL, no pages are present
*/
- if (must_commit)
- ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY);
+ if (must_commit) {
+ ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY);
+ }
goto out;
}
}
last_pg = first_pg;
while (last_pg < pages_in_upl) {
- /*
+ /*
* skip over missing pages...
*/
- for ( ; last_pg < pages_in_upl; last_pg++) {
- if (upl_page_present(pl, last_pg))
- break;
+ for (; last_pg < pages_in_upl; last_pg++) {
+ if (upl_page_present(pl, last_pg)) {
+ break;
+ }
}
- /*
- * skip over 'valid' pages... we don't want to issue I/O for these
- */
- for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) {
- if (!upl_valid_page(pl, last_pg))
- break;
+
+ if (ignore_valid_page_check == 1) {
+ start_pg = last_pg;
+ } else {
+ /*
+ * skip over 'valid' pages... we don't want to issue I/O for these
+ */
+ for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) {
+ if (!upl_valid_page(pl, last_pg)) {
+ break;
+ }
+ }
}
+
if (last_pg > start_pg) {
- /*
+ /*
* we've found a range of valid pages
* if we've got COMMIT responsibility
* commit this range of pages back to the
* cache unchanged
*/
- xsize = (last_pg - start_pg) * PAGE_SIZE;
+ xsize = (last_pg - start_pg) * PAGE_SIZE;
- if (must_commit)
- ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, xsize, UPL_ABORT_FREE_ON_EMPTY);
+ if (must_commit) {
+ ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, xsize, UPL_ABORT_FREE_ON_EMPTY);
+ }
}
- if (last_pg == pages_in_upl)
- /*
+ if (last_pg == pages_in_upl) {
+ /*
* we're done... all pages that were present
- * have either had I/O issued on them or
+ * have either had I/O issued on them or
* were aborted unchanged...
*/
- break;
+ break;
+ }
if (!upl_page_present(pl, last_pg)) {
- /*
- * we found a range of valid pages
+ /*
+ * we found a range of valid pages
* terminated by a missing page...
* bump index to the next page and continue on
*/
- last_pg++;
- continue;
+ last_pg++;
+ continue;
}
/*
* scan from the found invalid page looking for a valid
* 'cluster_io'
*/
for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) {
- if (upl_valid_page(pl, last_pg) || !upl_page_present(pl, last_pg))
- break;
+ if ((!ignore_valid_page_check && upl_valid_page(pl, last_pg)) || !upl_page_present(pl, last_pg)) {
+ break;
+ }
}
if (last_pg > start_pg) {
- int xoff;
- xsize = (last_pg - start_pg) * PAGE_SIZE;
+ int xoff;
+ xsize = (last_pg - start_pg) * PAGE_SIZE;
xoff = start_pg * PAGE_SIZE;
- if ( (error = VNOP_PAGEIN(vp, upl, (upl_offset_t) xoff,
- (off_t)f_offset + xoff,
- xsize, flags, vfs_context_current())) ) {
- /*
+ if ((error = VNOP_PAGEIN(vp, upl, (upl_offset_t) xoff,
+ (off_t)f_offset + xoff,
+ xsize, flags, vfs_context_current()))) {
+ /*
* Usually this UPL will be aborted/committed by the lower cluster layer.
*
* a) In the case of decmpfs, however, we may return an error (EAGAIN) to avoid
- * a deadlock with another thread already inflating the file.
+ * a deadlock with another thread already inflating the file.
*
* b) In the case of content protection, EPERM is a valid error and we should respect it.
*
* In those cases, we must take care of our UPL at this layer itself.
*/
if (must_commit) {
- if(error == EAGAIN) {
- ubc_upl_abort_range(upl, (upl_offset_t) xoff, xsize, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_RESTART);
+ if (error == EAGAIN) {
+ ubc_upl_abort_range(upl, (upl_offset_t) xoff, xsize, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_RESTART);
}
-#if CONFIG_PROTECT
- if(error == EPERM) {
- ubc_upl_abort_range(upl, (upl_offset_t) xoff, xsize, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR);
+ if (error == EPERM) {
+ ubc_upl_abort_range(upl, (upl_offset_t) xoff, xsize, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR);
}
-#endif
}
+ set_thread_pagein_error(current_thread(), error);
result = PAGER_ERROR;
error = PAGER_ERROR;
-
}
}
- }
+ }
out:
- if (errorp)
- *errorp = result;
+ vnode_put_from_pager(vp);
- ut = get_bsdthread_info(current_thread());
-
- if (ut->uu_lowpri_window) {
- /*
- * task is marked as a low priority I/O type
- * and the I/O we issued while in this page fault
- * collided with normal I/O operations... we'll
- * delay in order to mitigate the impact of this
- * task on the normal operation of the system
- */
- throttle_lowpri_io(TRUE);
+ if (errorp) {
+ *errorp = result;
}
- return (error);
-}
-
-void
-vnode_pager_shutdown(void)
-{
- int i;
- vnode_t vp;
-
- for(i = 0; i < MAX_BACKING_STORE; i++) {
- vp = (vnode_t)(bs_port_table[i]).vp;
- if (vp) {
- (bs_port_table[i]).vp = 0;
- /* get rid of macx_swapon() reference */
- vnode_rele(vp);
- }
- }
+ return error;
}
-
void *
upl_get_internal_page_list(upl_t upl)
{
- return(UPL_GET_INTERNAL_PAGE_LIST(upl));
-
+ return UPL_GET_INTERNAL_PAGE_LIST(upl);
}
projects / apple / xnu.git / blobdiff