mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 11:56:40 +07:00
9637d51734
-----BEGIN PGP SIGNATURE----- iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAl0s1ZEQHGF4Ym9lQGtl cm5lbC5kawAKCRD301j7KXHgpiCEEACE9H/pXoegTTWIVPVajMlsa19UHIeilk4N GI7oKSiirQEMZnAOmrEzgB4/0zyYQsVypys0gZlYUD3GJVsXDT3zzjNXL5NpVg/O nqwSGWMHBSjWkLbaM40Pb2QLXsYgveptNL+9PtxrgtoYPoT5/+TyrJMFrRfi72EK WFeNDKOu6aJxpJ26JSsckJ0gluKeeEpRoEqsgHGIwaMIGHQf+b+ikk7tel5FAIgA uDwwD+Oxsdgh/ChsXL0d90GkcbcSp6GQ7GybxVmw/tPijx6mpeIY72xY3Zx+t8zF b71UNk6NmCKjOPO/6fiuYKKTYw+KhzlyEKO0j675HKfx2AhchEwKw0irp4yUlydA zxWYmz4U7iRgktJtymv3J4FEQQ3S6d1EnuQkQNX1LwiOsEsfzhkWi+7jy7KFhZoJ AqtYzqnOXvLx92q0vloj06HtK6zo+I/MINldy0+qn9lq0N0VF+dctyztAHLsF7P6 pUtS6i7l1JSFKAmMhC31sIj5TImaehM2e/TWMUPEDZaO96oKCmQwOF1oiloc6vlW h4xWsxP/9zOFcWNyPzy6Vo3JUXWRvFA7K+jV3Hsukw6rVHiNCGVYGSlTv8Roi5b7 I4ggu9R2JOGyku7UIlL50IRxEyjAp11LaO8yHhcCnRB65rmyBuNMQNcfOsfxpZ5Y 1mtSNhm5TQ== =g8xI -----END PGP SIGNATURE----- Merge tag 'for-linus-20190715' of git://git.kernel.dk/linux-block Pull more block updates from Jens Axboe: "A later pull request with some followup items. I had some vacation coming up to the merge window, so certain things items were delayed a bit. This pull request also contains fixes that came in within the last few days of the merge window, which I didn't want to push right before sending you a pull request. This contains: - NVMe pull request, mostly fixes, but also a few minor items on the feature side that were timing constrained (Christoph et al) - Report zones fixes (Damien) - Removal of dead code (Damien) - Turn on cgroup psi memstall (Josef) - block cgroup MAINTAINERS entry (Konstantin) - Flush init fix (Josef) - blk-throttle low iops timing fix (Konstantin) - nbd resize fixes (Mike) - nbd 0 blocksize crash fix (Xiubo) - block integrity error leak fix (Wenwen) - blk-cgroup writeback and priority inheritance fixes (Tejun)" * tag 'for-linus-20190715' of git://git.kernel.dk/linux-block: (42 commits) MAINTAINERS: add entry for block io cgroup null_blk: fixup ->report_zones() for !CONFIG_BLK_DEV_ZONED block: Limit zone array allocation size sd_zbc: Fix report zones buffer allocation block: Kill gfp_t argument of blkdev_report_zones() block: Allow mapping of vmalloc-ed buffers block/bio-integrity: fix a memory leak bug nvme: fix NULL deref for fabrics options nbd: add netlink reconfigure resize support nbd: fix crash when the blksize is zero block: Disable write plugging for zoned block devices block: Fix elevator name declaration block: Remove unused definitions nvme: fix regression upon hot device removal and insertion blk-throttle: fix zero wait time for iops throttled group block: Fix potential overflow in blk_report_zones() blkcg: implement REQ_CGROUP_PUNT blkcg, writeback: Implement wbc_blkcg_css() blkcg, writeback: Add wbc->no_cgroup_owner blkcg, writeback: Rename wbc_account_io() to wbc_account_cgroup_owner() ...
1211 lines
34 KiB
C
1211 lines
34 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
|
|
* Copyright (c) 2016-2018 Christoph Hellwig.
|
|
* All Rights Reserved.
|
|
*/
|
|
#include "xfs.h"
|
|
#include "xfs_shared.h"
|
|
#include "xfs_format.h"
|
|
#include "xfs_log_format.h"
|
|
#include "xfs_trans_resv.h"
|
|
#include "xfs_mount.h"
|
|
#include "xfs_inode.h"
|
|
#include "xfs_trans.h"
|
|
#include "xfs_iomap.h"
|
|
#include "xfs_trace.h"
|
|
#include "xfs_bmap.h"
|
|
#include "xfs_bmap_util.h"
|
|
#include "xfs_reflink.h"
|
|
|
|
/*
|
|
* structure owned by writepages passed to individual writepage calls
|
|
*/
|
|
struct xfs_writepage_ctx {
|
|
struct xfs_bmbt_irec imap;
|
|
int fork;
|
|
unsigned int data_seq;
|
|
unsigned int cow_seq;
|
|
struct xfs_ioend *ioend;
|
|
};
|
|
|
|
struct block_device *
|
|
xfs_find_bdev_for_inode(
|
|
struct inode *inode)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
|
|
if (XFS_IS_REALTIME_INODE(ip))
|
|
return mp->m_rtdev_targp->bt_bdev;
|
|
else
|
|
return mp->m_ddev_targp->bt_bdev;
|
|
}
|
|
|
|
struct dax_device *
|
|
xfs_find_daxdev_for_inode(
|
|
struct inode *inode)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
|
|
if (XFS_IS_REALTIME_INODE(ip))
|
|
return mp->m_rtdev_targp->bt_daxdev;
|
|
else
|
|
return mp->m_ddev_targp->bt_daxdev;
|
|
}
|
|
|
|
static void
|
|
xfs_finish_page_writeback(
|
|
struct inode *inode,
|
|
struct bio_vec *bvec,
|
|
int error)
|
|
{
|
|
struct iomap_page *iop = to_iomap_page(bvec->bv_page);
|
|
|
|
if (error) {
|
|
SetPageError(bvec->bv_page);
|
|
mapping_set_error(inode->i_mapping, -EIO);
|
|
}
|
|
|
|
ASSERT(iop || i_blocksize(inode) == PAGE_SIZE);
|
|
ASSERT(!iop || atomic_read(&iop->write_count) > 0);
|
|
|
|
if (!iop || atomic_dec_and_test(&iop->write_count))
|
|
end_page_writeback(bvec->bv_page);
|
|
}
|
|
|
|
/*
|
|
* We're now finished for good with this ioend structure. Update the page
|
|
* state, release holds on bios, and finally free up memory. Do not use the
|
|
* ioend after this.
|
|
*/
|
|
STATIC void
|
|
xfs_destroy_ioend(
|
|
struct xfs_ioend *ioend,
|
|
int error)
|
|
{
|
|
struct inode *inode = ioend->io_inode;
|
|
struct bio *bio = &ioend->io_inline_bio;
|
|
struct bio *last = ioend->io_bio, *next;
|
|
u64 start = bio->bi_iter.bi_sector;
|
|
bool quiet = bio_flagged(bio, BIO_QUIET);
|
|
|
|
for (bio = &ioend->io_inline_bio; bio; bio = next) {
|
|
struct bio_vec *bvec;
|
|
struct bvec_iter_all iter_all;
|
|
|
|
/*
|
|
* For the last bio, bi_private points to the ioend, so we
|
|
* need to explicitly end the iteration here.
|
|
*/
|
|
if (bio == last)
|
|
next = NULL;
|
|
else
|
|
next = bio->bi_private;
|
|
|
|
/* walk each page on bio, ending page IO on them */
|
|
bio_for_each_segment_all(bvec, bio, iter_all)
|
|
xfs_finish_page_writeback(inode, bvec, error);
|
|
bio_put(bio);
|
|
}
|
|
|
|
if (unlikely(error && !quiet)) {
|
|
xfs_err_ratelimited(XFS_I(inode)->i_mount,
|
|
"writeback error on sector %llu", start);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Fast and loose check if this write could update the on-disk inode size.
|
|
*/
|
|
static inline bool xfs_ioend_is_append(struct xfs_ioend *ioend)
|
|
{
|
|
return ioend->io_offset + ioend->io_size >
|
|
XFS_I(ioend->io_inode)->i_d.di_size;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_setfilesize_trans_alloc(
|
|
struct xfs_ioend *ioend)
|
|
{
|
|
struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount;
|
|
struct xfs_trans *tp;
|
|
int error;
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
|
|
if (error)
|
|
return error;
|
|
|
|
ioend->io_append_trans = tp;
|
|
|
|
/*
|
|
* We may pass freeze protection with a transaction. So tell lockdep
|
|
* we released it.
|
|
*/
|
|
__sb_writers_release(ioend->io_inode->i_sb, SB_FREEZE_FS);
|
|
/*
|
|
* We hand off the transaction to the completion thread now, so
|
|
* clear the flag here.
|
|
*/
|
|
current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update on-disk file size now that data has been written to disk.
|
|
*/
|
|
STATIC int
|
|
__xfs_setfilesize(
|
|
struct xfs_inode *ip,
|
|
struct xfs_trans *tp,
|
|
xfs_off_t offset,
|
|
size_t size)
|
|
{
|
|
xfs_fsize_t isize;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
isize = xfs_new_eof(ip, offset + size);
|
|
if (!isize) {
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_cancel(tp);
|
|
return 0;
|
|
}
|
|
|
|
trace_xfs_setfilesize(ip, offset, size);
|
|
|
|
ip->i_d.di_size = isize;
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
return xfs_trans_commit(tp);
|
|
}
|
|
|
|
int
|
|
xfs_setfilesize(
|
|
struct xfs_inode *ip,
|
|
xfs_off_t offset,
|
|
size_t size)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_trans *tp;
|
|
int error;
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
|
|
if (error)
|
|
return error;
|
|
|
|
return __xfs_setfilesize(ip, tp, offset, size);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_setfilesize_ioend(
|
|
struct xfs_ioend *ioend,
|
|
int error)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(ioend->io_inode);
|
|
struct xfs_trans *tp = ioend->io_append_trans;
|
|
|
|
/*
|
|
* The transaction may have been allocated in the I/O submission thread,
|
|
* thus we need to mark ourselves as being in a transaction manually.
|
|
* Similarly for freeze protection.
|
|
*/
|
|
current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
|
|
__sb_writers_acquired(VFS_I(ip)->i_sb, SB_FREEZE_FS);
|
|
|
|
/* we abort the update if there was an IO error */
|
|
if (error) {
|
|
xfs_trans_cancel(tp);
|
|
return error;
|
|
}
|
|
|
|
return __xfs_setfilesize(ip, tp, ioend->io_offset, ioend->io_size);
|
|
}
|
|
|
|
/*
|
|
* IO write completion.
|
|
*/
|
|
STATIC void
|
|
xfs_end_ioend(
|
|
struct xfs_ioend *ioend)
|
|
{
|
|
struct list_head ioend_list;
|
|
struct xfs_inode *ip = XFS_I(ioend->io_inode);
|
|
xfs_off_t offset = ioend->io_offset;
|
|
size_t size = ioend->io_size;
|
|
unsigned int nofs_flag;
|
|
int error;
|
|
|
|
/*
|
|
* We can allocate memory here while doing writeback on behalf of
|
|
* memory reclaim. To avoid memory allocation deadlocks set the
|
|
* task-wide nofs context for the following operations.
|
|
*/
|
|
nofs_flag = memalloc_nofs_save();
|
|
|
|
/*
|
|
* Just clean up the in-memory strutures if the fs has been shut down.
|
|
*/
|
|
if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
|
|
error = -EIO;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Clean up any COW blocks on an I/O error.
|
|
*/
|
|
error = blk_status_to_errno(ioend->io_bio->bi_status);
|
|
if (unlikely(error)) {
|
|
if (ioend->io_fork == XFS_COW_FORK)
|
|
xfs_reflink_cancel_cow_range(ip, offset, size, true);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Success: commit the COW or unwritten blocks if needed.
|
|
*/
|
|
if (ioend->io_fork == XFS_COW_FORK)
|
|
error = xfs_reflink_end_cow(ip, offset, size);
|
|
else if (ioend->io_state == XFS_EXT_UNWRITTEN)
|
|
error = xfs_iomap_write_unwritten(ip, offset, size, false);
|
|
else
|
|
ASSERT(!xfs_ioend_is_append(ioend) || ioend->io_append_trans);
|
|
|
|
done:
|
|
if (ioend->io_append_trans)
|
|
error = xfs_setfilesize_ioend(ioend, error);
|
|
list_replace_init(&ioend->io_list, &ioend_list);
|
|
xfs_destroy_ioend(ioend, error);
|
|
|
|
while (!list_empty(&ioend_list)) {
|
|
ioend = list_first_entry(&ioend_list, struct xfs_ioend,
|
|
io_list);
|
|
list_del_init(&ioend->io_list);
|
|
xfs_destroy_ioend(ioend, error);
|
|
}
|
|
|
|
memalloc_nofs_restore(nofs_flag);
|
|
}
|
|
|
|
/*
|
|
* We can merge two adjacent ioends if they have the same set of work to do.
|
|
*/
|
|
static bool
|
|
xfs_ioend_can_merge(
|
|
struct xfs_ioend *ioend,
|
|
struct xfs_ioend *next)
|
|
{
|
|
if (ioend->io_bio->bi_status != next->io_bio->bi_status)
|
|
return false;
|
|
if ((ioend->io_fork == XFS_COW_FORK) ^ (next->io_fork == XFS_COW_FORK))
|
|
return false;
|
|
if ((ioend->io_state == XFS_EXT_UNWRITTEN) ^
|
|
(next->io_state == XFS_EXT_UNWRITTEN))
|
|
return false;
|
|
if (ioend->io_offset + ioend->io_size != next->io_offset)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* If the to be merged ioend has a preallocated transaction for file
|
|
* size updates we need to ensure the ioend it is merged into also
|
|
* has one. If it already has one we can simply cancel the transaction
|
|
* as it is guaranteed to be clean.
|
|
*/
|
|
static void
|
|
xfs_ioend_merge_append_transactions(
|
|
struct xfs_ioend *ioend,
|
|
struct xfs_ioend *next)
|
|
{
|
|
if (!ioend->io_append_trans) {
|
|
ioend->io_append_trans = next->io_append_trans;
|
|
next->io_append_trans = NULL;
|
|
} else {
|
|
xfs_setfilesize_ioend(next, -ECANCELED);
|
|
}
|
|
}
|
|
|
|
/* Try to merge adjacent completions. */
|
|
STATIC void
|
|
xfs_ioend_try_merge(
|
|
struct xfs_ioend *ioend,
|
|
struct list_head *more_ioends)
|
|
{
|
|
struct xfs_ioend *next_ioend;
|
|
|
|
while (!list_empty(more_ioends)) {
|
|
next_ioend = list_first_entry(more_ioends, struct xfs_ioend,
|
|
io_list);
|
|
if (!xfs_ioend_can_merge(ioend, next_ioend))
|
|
break;
|
|
list_move_tail(&next_ioend->io_list, &ioend->io_list);
|
|
ioend->io_size += next_ioend->io_size;
|
|
if (next_ioend->io_append_trans)
|
|
xfs_ioend_merge_append_transactions(ioend, next_ioend);
|
|
}
|
|
}
|
|
|
|
/* list_sort compare function for ioends */
|
|
static int
|
|
xfs_ioend_compare(
|
|
void *priv,
|
|
struct list_head *a,
|
|
struct list_head *b)
|
|
{
|
|
struct xfs_ioend *ia;
|
|
struct xfs_ioend *ib;
|
|
|
|
ia = container_of(a, struct xfs_ioend, io_list);
|
|
ib = container_of(b, struct xfs_ioend, io_list);
|
|
if (ia->io_offset < ib->io_offset)
|
|
return -1;
|
|
else if (ia->io_offset > ib->io_offset)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Finish all pending io completions. */
|
|
void
|
|
xfs_end_io(
|
|
struct work_struct *work)
|
|
{
|
|
struct xfs_inode *ip;
|
|
struct xfs_ioend *ioend;
|
|
struct list_head completion_list;
|
|
unsigned long flags;
|
|
|
|
ip = container_of(work, struct xfs_inode, i_ioend_work);
|
|
|
|
spin_lock_irqsave(&ip->i_ioend_lock, flags);
|
|
list_replace_init(&ip->i_ioend_list, &completion_list);
|
|
spin_unlock_irqrestore(&ip->i_ioend_lock, flags);
|
|
|
|
list_sort(NULL, &completion_list, xfs_ioend_compare);
|
|
|
|
while (!list_empty(&completion_list)) {
|
|
ioend = list_first_entry(&completion_list, struct xfs_ioend,
|
|
io_list);
|
|
list_del_init(&ioend->io_list);
|
|
xfs_ioend_try_merge(ioend, &completion_list);
|
|
xfs_end_ioend(ioend);
|
|
}
|
|
}
|
|
|
|
STATIC void
|
|
xfs_end_bio(
|
|
struct bio *bio)
|
|
{
|
|
struct xfs_ioend *ioend = bio->bi_private;
|
|
struct xfs_inode *ip = XFS_I(ioend->io_inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
unsigned long flags;
|
|
|
|
if (ioend->io_fork == XFS_COW_FORK ||
|
|
ioend->io_state == XFS_EXT_UNWRITTEN ||
|
|
ioend->io_append_trans != NULL) {
|
|
spin_lock_irqsave(&ip->i_ioend_lock, flags);
|
|
if (list_empty(&ip->i_ioend_list))
|
|
WARN_ON_ONCE(!queue_work(mp->m_unwritten_workqueue,
|
|
&ip->i_ioend_work));
|
|
list_add_tail(&ioend->io_list, &ip->i_ioend_list);
|
|
spin_unlock_irqrestore(&ip->i_ioend_lock, flags);
|
|
} else
|
|
xfs_destroy_ioend(ioend, blk_status_to_errno(bio->bi_status));
|
|
}
|
|
|
|
/*
|
|
* Fast revalidation of the cached writeback mapping. Return true if the current
|
|
* mapping is valid, false otherwise.
|
|
*/
|
|
static bool
|
|
xfs_imap_valid(
|
|
struct xfs_writepage_ctx *wpc,
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t offset_fsb)
|
|
{
|
|
if (offset_fsb < wpc->imap.br_startoff ||
|
|
offset_fsb >= wpc->imap.br_startoff + wpc->imap.br_blockcount)
|
|
return false;
|
|
/*
|
|
* If this is a COW mapping, it is sufficient to check that the mapping
|
|
* covers the offset. Be careful to check this first because the caller
|
|
* can revalidate a COW mapping without updating the data seqno.
|
|
*/
|
|
if (wpc->fork == XFS_COW_FORK)
|
|
return true;
|
|
|
|
/*
|
|
* This is not a COW mapping. Check the sequence number of the data fork
|
|
* because concurrent changes could have invalidated the extent. Check
|
|
* the COW fork because concurrent changes since the last time we
|
|
* checked (and found nothing at this offset) could have added
|
|
* overlapping blocks.
|
|
*/
|
|
if (wpc->data_seq != READ_ONCE(ip->i_df.if_seq))
|
|
return false;
|
|
if (xfs_inode_has_cow_data(ip) &&
|
|
wpc->cow_seq != READ_ONCE(ip->i_cowfp->if_seq))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Pass in a dellalloc extent and convert it to real extents, return the real
|
|
* extent that maps offset_fsb in wpc->imap.
|
|
*
|
|
* The current page is held locked so nothing could have removed the block
|
|
* backing offset_fsb, although it could have moved from the COW to the data
|
|
* fork by another thread.
|
|
*/
|
|
static int
|
|
xfs_convert_blocks(
|
|
struct xfs_writepage_ctx *wpc,
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t offset_fsb)
|
|
{
|
|
int error;
|
|
|
|
/*
|
|
* Attempt to allocate whatever delalloc extent currently backs
|
|
* offset_fsb and put the result into wpc->imap. Allocate in a loop
|
|
* because it may take several attempts to allocate real blocks for a
|
|
* contiguous delalloc extent if free space is sufficiently fragmented.
|
|
*/
|
|
do {
|
|
error = xfs_bmapi_convert_delalloc(ip, wpc->fork, offset_fsb,
|
|
&wpc->imap, wpc->fork == XFS_COW_FORK ?
|
|
&wpc->cow_seq : &wpc->data_seq);
|
|
if (error)
|
|
return error;
|
|
} while (wpc->imap.br_startoff + wpc->imap.br_blockcount <= offset_fsb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_map_blocks(
|
|
struct xfs_writepage_ctx *wpc,
|
|
struct inode *inode,
|
|
loff_t offset)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
ssize_t count = i_blocksize(inode);
|
|
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + count);
|
|
xfs_fileoff_t cow_fsb = NULLFILEOFF;
|
|
struct xfs_bmbt_irec imap;
|
|
struct xfs_iext_cursor icur;
|
|
int retries = 0;
|
|
int error = 0;
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return -EIO;
|
|
|
|
/*
|
|
* COW fork blocks can overlap data fork blocks even if the blocks
|
|
* aren't shared. COW I/O always takes precedent, so we must always
|
|
* check for overlap on reflink inodes unless the mapping is already a
|
|
* COW one, or the COW fork hasn't changed from the last time we looked
|
|
* at it.
|
|
*
|
|
* It's safe to check the COW fork if_seq here without the ILOCK because
|
|
* we've indirectly protected against concurrent updates: writeback has
|
|
* the page locked, which prevents concurrent invalidations by reflink
|
|
* and directio and prevents concurrent buffered writes to the same
|
|
* page. Changes to if_seq always happen under i_lock, which protects
|
|
* against concurrent updates and provides a memory barrier on the way
|
|
* out that ensures that we always see the current value.
|
|
*/
|
|
if (xfs_imap_valid(wpc, ip, offset_fsb))
|
|
return 0;
|
|
|
|
/*
|
|
* If we don't have a valid map, now it's time to get a new one for this
|
|
* offset. This will convert delayed allocations (including COW ones)
|
|
* into real extents. If we return without a valid map, it means we
|
|
* landed in a hole and we skip the block.
|
|
*/
|
|
retry:
|
|
xfs_ilock(ip, XFS_ILOCK_SHARED);
|
|
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
|
|
(ip->i_df.if_flags & XFS_IFEXTENTS));
|
|
|
|
/*
|
|
* Check if this is offset is covered by a COW extents, and if yes use
|
|
* it directly instead of looking up anything in the data fork.
|
|
*/
|
|
if (xfs_inode_has_cow_data(ip) &&
|
|
xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &imap))
|
|
cow_fsb = imap.br_startoff;
|
|
if (cow_fsb != NULLFILEOFF && cow_fsb <= offset_fsb) {
|
|
wpc->cow_seq = READ_ONCE(ip->i_cowfp->if_seq);
|
|
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
|
|
wpc->fork = XFS_COW_FORK;
|
|
goto allocate_blocks;
|
|
}
|
|
|
|
/*
|
|
* No COW extent overlap. Revalidate now that we may have updated
|
|
* ->cow_seq. If the data mapping is still valid, we're done.
|
|
*/
|
|
if (xfs_imap_valid(wpc, ip, offset_fsb)) {
|
|
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If we don't have a valid map, now it's time to get a new one for this
|
|
* offset. This will convert delayed allocations (including COW ones)
|
|
* into real extents.
|
|
*/
|
|
if (!xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap))
|
|
imap.br_startoff = end_fsb; /* fake a hole past EOF */
|
|
wpc->data_seq = READ_ONCE(ip->i_df.if_seq);
|
|
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
|
|
wpc->fork = XFS_DATA_FORK;
|
|
|
|
/* landed in a hole or beyond EOF? */
|
|
if (imap.br_startoff > offset_fsb) {
|
|
imap.br_blockcount = imap.br_startoff - offset_fsb;
|
|
imap.br_startoff = offset_fsb;
|
|
imap.br_startblock = HOLESTARTBLOCK;
|
|
imap.br_state = XFS_EXT_NORM;
|
|
}
|
|
|
|
/*
|
|
* Truncate to the next COW extent if there is one. This is the only
|
|
* opportunity to do this because we can skip COW fork lookups for the
|
|
* subsequent blocks in the mapping; however, the requirement to treat
|
|
* the COW range separately remains.
|
|
*/
|
|
if (cow_fsb != NULLFILEOFF &&
|
|
cow_fsb < imap.br_startoff + imap.br_blockcount)
|
|
imap.br_blockcount = cow_fsb - imap.br_startoff;
|
|
|
|
/* got a delalloc extent? */
|
|
if (imap.br_startblock != HOLESTARTBLOCK &&
|
|
isnullstartblock(imap.br_startblock))
|
|
goto allocate_blocks;
|
|
|
|
wpc->imap = imap;
|
|
trace_xfs_map_blocks_found(ip, offset, count, wpc->fork, &imap);
|
|
return 0;
|
|
allocate_blocks:
|
|
error = xfs_convert_blocks(wpc, ip, offset_fsb);
|
|
if (error) {
|
|
/*
|
|
* If we failed to find the extent in the COW fork we might have
|
|
* raced with a COW to data fork conversion or truncate.
|
|
* Restart the lookup to catch the extent in the data fork for
|
|
* the former case, but prevent additional retries to avoid
|
|
* looping forever for the latter case.
|
|
*/
|
|
if (error == -EAGAIN && wpc->fork == XFS_COW_FORK && !retries++)
|
|
goto retry;
|
|
ASSERT(error != -EAGAIN);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Due to merging the return real extent might be larger than the
|
|
* original delalloc one. Trim the return extent to the next COW
|
|
* boundary again to force a re-lookup.
|
|
*/
|
|
if (wpc->fork != XFS_COW_FORK && cow_fsb != NULLFILEOFF &&
|
|
cow_fsb < wpc->imap.br_startoff + wpc->imap.br_blockcount)
|
|
wpc->imap.br_blockcount = cow_fsb - wpc->imap.br_startoff;
|
|
|
|
ASSERT(wpc->imap.br_startoff <= offset_fsb);
|
|
ASSERT(wpc->imap.br_startoff + wpc->imap.br_blockcount > offset_fsb);
|
|
trace_xfs_map_blocks_alloc(ip, offset, count, wpc->fork, &imap);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Submit the bio for an ioend. We are passed an ioend with a bio attached to
|
|
* it, and we submit that bio. The ioend may be used for multiple bio
|
|
* submissions, so we only want to allocate an append transaction for the ioend
|
|
* once. In the case of multiple bio submission, each bio will take an IO
|
|
* reference to the ioend to ensure that the ioend completion is only done once
|
|
* all bios have been submitted and the ioend is really done.
|
|
*
|
|
* If @status is non-zero, it means that we have a situation where some part of
|
|
* the submission process has failed after we have marked paged for writeback
|
|
* and unlocked them. In this situation, we need to fail the bio and ioend
|
|
* rather than submit it to IO. This typically only happens on a filesystem
|
|
* shutdown.
|
|
*/
|
|
STATIC int
|
|
xfs_submit_ioend(
|
|
struct writeback_control *wbc,
|
|
struct xfs_ioend *ioend,
|
|
int status)
|
|
{
|
|
unsigned int nofs_flag;
|
|
|
|
/*
|
|
* We can allocate memory here while doing writeback on behalf of
|
|
* memory reclaim. To avoid memory allocation deadlocks set the
|
|
* task-wide nofs context for the following operations.
|
|
*/
|
|
nofs_flag = memalloc_nofs_save();
|
|
|
|
/* Convert CoW extents to regular */
|
|
if (!status && ioend->io_fork == XFS_COW_FORK) {
|
|
status = xfs_reflink_convert_cow(XFS_I(ioend->io_inode),
|
|
ioend->io_offset, ioend->io_size);
|
|
}
|
|
|
|
/* Reserve log space if we might write beyond the on-disk inode size. */
|
|
if (!status &&
|
|
(ioend->io_fork == XFS_COW_FORK ||
|
|
ioend->io_state != XFS_EXT_UNWRITTEN) &&
|
|
xfs_ioend_is_append(ioend) &&
|
|
!ioend->io_append_trans)
|
|
status = xfs_setfilesize_trans_alloc(ioend);
|
|
|
|
memalloc_nofs_restore(nofs_flag);
|
|
|
|
ioend->io_bio->bi_private = ioend;
|
|
ioend->io_bio->bi_end_io = xfs_end_bio;
|
|
|
|
/*
|
|
* If we are failing the IO now, just mark the ioend with an
|
|
* error and finish it. This will run IO completion immediately
|
|
* as there is only one reference to the ioend at this point in
|
|
* time.
|
|
*/
|
|
if (status) {
|
|
ioend->io_bio->bi_status = errno_to_blk_status(status);
|
|
bio_endio(ioend->io_bio);
|
|
return status;
|
|
}
|
|
|
|
submit_bio(ioend->io_bio);
|
|
return 0;
|
|
}
|
|
|
|
static struct xfs_ioend *
|
|
xfs_alloc_ioend(
|
|
struct inode *inode,
|
|
int fork,
|
|
xfs_exntst_t state,
|
|
xfs_off_t offset,
|
|
struct block_device *bdev,
|
|
sector_t sector,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct xfs_ioend *ioend;
|
|
struct bio *bio;
|
|
|
|
bio = bio_alloc_bioset(GFP_NOFS, BIO_MAX_PAGES, &xfs_ioend_bioset);
|
|
bio_set_dev(bio, bdev);
|
|
bio->bi_iter.bi_sector = sector;
|
|
bio->bi_opf = REQ_OP_WRITE | wbc_to_write_flags(wbc);
|
|
bio->bi_write_hint = inode->i_write_hint;
|
|
wbc_init_bio(wbc, bio);
|
|
|
|
ioend = container_of(bio, struct xfs_ioend, io_inline_bio);
|
|
INIT_LIST_HEAD(&ioend->io_list);
|
|
ioend->io_fork = fork;
|
|
ioend->io_state = state;
|
|
ioend->io_inode = inode;
|
|
ioend->io_size = 0;
|
|
ioend->io_offset = offset;
|
|
ioend->io_append_trans = NULL;
|
|
ioend->io_bio = bio;
|
|
return ioend;
|
|
}
|
|
|
|
/*
|
|
* Allocate a new bio, and chain the old bio to the new one.
|
|
*
|
|
* Note that we have to do perform the chaining in this unintuitive order
|
|
* so that the bi_private linkage is set up in the right direction for the
|
|
* traversal in xfs_destroy_ioend().
|
|
*/
|
|
static struct bio *
|
|
xfs_chain_bio(
|
|
struct bio *prev)
|
|
{
|
|
struct bio *new;
|
|
|
|
new = bio_alloc(GFP_NOFS, BIO_MAX_PAGES);
|
|
bio_copy_dev(new, prev);/* also copies over blkcg information */
|
|
new->bi_iter.bi_sector = bio_end_sector(prev);
|
|
new->bi_opf = prev->bi_opf;
|
|
new->bi_write_hint = prev->bi_write_hint;
|
|
|
|
bio_chain(prev, new);
|
|
bio_get(prev); /* for xfs_destroy_ioend */
|
|
submit_bio(prev);
|
|
return new;
|
|
}
|
|
|
|
/*
|
|
* Test to see if we have an existing ioend structure that we could append to
|
|
* first, otherwise finish off the current ioend and start another.
|
|
*/
|
|
STATIC void
|
|
xfs_add_to_ioend(
|
|
struct inode *inode,
|
|
xfs_off_t offset,
|
|
struct page *page,
|
|
struct iomap_page *iop,
|
|
struct xfs_writepage_ctx *wpc,
|
|
struct writeback_control *wbc,
|
|
struct list_head *iolist)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct block_device *bdev = xfs_find_bdev_for_inode(inode);
|
|
unsigned len = i_blocksize(inode);
|
|
unsigned poff = offset & (PAGE_SIZE - 1);
|
|
bool merged, same_page = false;
|
|
sector_t sector;
|
|
|
|
sector = xfs_fsb_to_db(ip, wpc->imap.br_startblock) +
|
|
((offset - XFS_FSB_TO_B(mp, wpc->imap.br_startoff)) >> 9);
|
|
|
|
if (!wpc->ioend ||
|
|
wpc->fork != wpc->ioend->io_fork ||
|
|
wpc->imap.br_state != wpc->ioend->io_state ||
|
|
sector != bio_end_sector(wpc->ioend->io_bio) ||
|
|
offset != wpc->ioend->io_offset + wpc->ioend->io_size) {
|
|
if (wpc->ioend)
|
|
list_add(&wpc->ioend->io_list, iolist);
|
|
wpc->ioend = xfs_alloc_ioend(inode, wpc->fork,
|
|
wpc->imap.br_state, offset, bdev, sector, wbc);
|
|
}
|
|
|
|
merged = __bio_try_merge_page(wpc->ioend->io_bio, page, len, poff,
|
|
&same_page);
|
|
|
|
if (iop && !same_page)
|
|
atomic_inc(&iop->write_count);
|
|
|
|
if (!merged) {
|
|
if (bio_full(wpc->ioend->io_bio, len))
|
|
wpc->ioend->io_bio = xfs_chain_bio(wpc->ioend->io_bio);
|
|
bio_add_page(wpc->ioend->io_bio, page, len, poff);
|
|
}
|
|
|
|
wpc->ioend->io_size += len;
|
|
wbc_account_cgroup_owner(wbc, page, len);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_vm_invalidatepage(
|
|
struct page *page,
|
|
unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
trace_xfs_invalidatepage(page->mapping->host, page, offset, length);
|
|
iomap_invalidatepage(page, offset, length);
|
|
}
|
|
|
|
/*
|
|
* If the page has delalloc blocks on it, we need to punch them out before we
|
|
* invalidate the page. If we don't, we leave a stale delalloc mapping on the
|
|
* inode that can trip up a later direct I/O read operation on the same region.
|
|
*
|
|
* We prevent this by truncating away the delalloc regions on the page. Because
|
|
* they are delalloc, we can do this without needing a transaction. Indeed - if
|
|
* we get ENOSPC errors, we have to be able to do this truncation without a
|
|
* transaction as there is no space left for block reservation (typically why we
|
|
* see a ENOSPC in writeback).
|
|
*/
|
|
STATIC void
|
|
xfs_aops_discard_page(
|
|
struct page *page)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
loff_t offset = page_offset(page);
|
|
xfs_fileoff_t start_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
int error;
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
goto out_invalidate;
|
|
|
|
xfs_alert(mp,
|
|
"page discard on page "PTR_FMT", inode 0x%llx, offset %llu.",
|
|
page, ip->i_ino, offset);
|
|
|
|
error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
|
|
PAGE_SIZE / i_blocksize(inode));
|
|
if (error && !XFS_FORCED_SHUTDOWN(mp))
|
|
xfs_alert(mp, "page discard unable to remove delalloc mapping.");
|
|
out_invalidate:
|
|
xfs_vm_invalidatepage(page, 0, PAGE_SIZE);
|
|
}
|
|
|
|
/*
|
|
* We implement an immediate ioend submission policy here to avoid needing to
|
|
* chain multiple ioends and hence nest mempool allocations which can violate
|
|
* forward progress guarantees we need to provide. The current ioend we are
|
|
* adding blocks to is cached on the writepage context, and if the new block
|
|
* does not append to the cached ioend it will create a new ioend and cache that
|
|
* instead.
|
|
*
|
|
* If a new ioend is created and cached, the old ioend is returned and queued
|
|
* locally for submission once the entire page is processed or an error has been
|
|
* detected. While ioends are submitted immediately after they are completed,
|
|
* batching optimisations are provided by higher level block plugging.
|
|
*
|
|
* At the end of a writeback pass, there will be a cached ioend remaining on the
|
|
* writepage context that the caller will need to submit.
|
|
*/
|
|
static int
|
|
xfs_writepage_map(
|
|
struct xfs_writepage_ctx *wpc,
|
|
struct writeback_control *wbc,
|
|
struct inode *inode,
|
|
struct page *page,
|
|
uint64_t end_offset)
|
|
{
|
|
LIST_HEAD(submit_list);
|
|
struct iomap_page *iop = to_iomap_page(page);
|
|
unsigned len = i_blocksize(inode);
|
|
struct xfs_ioend *ioend, *next;
|
|
uint64_t file_offset; /* file offset of page */
|
|
int error = 0, count = 0, i;
|
|
|
|
ASSERT(iop || i_blocksize(inode) == PAGE_SIZE);
|
|
ASSERT(!iop || atomic_read(&iop->write_count) == 0);
|
|
|
|
/*
|
|
* Walk through the page to find areas to write back. If we run off the
|
|
* end of the current map or find the current map invalid, grab a new
|
|
* one.
|
|
*/
|
|
for (i = 0, file_offset = page_offset(page);
|
|
i < (PAGE_SIZE >> inode->i_blkbits) && file_offset < end_offset;
|
|
i++, file_offset += len) {
|
|
if (iop && !test_bit(i, iop->uptodate))
|
|
continue;
|
|
|
|
error = xfs_map_blocks(wpc, inode, file_offset);
|
|
if (error)
|
|
break;
|
|
if (wpc->imap.br_startblock == HOLESTARTBLOCK)
|
|
continue;
|
|
xfs_add_to_ioend(inode, file_offset, page, iop, wpc, wbc,
|
|
&submit_list);
|
|
count++;
|
|
}
|
|
|
|
ASSERT(wpc->ioend || list_empty(&submit_list));
|
|
ASSERT(PageLocked(page));
|
|
ASSERT(!PageWriteback(page));
|
|
|
|
/*
|
|
* On error, we have to fail the ioend here because we may have set
|
|
* pages under writeback, we have to make sure we run IO completion to
|
|
* mark the error state of the IO appropriately, so we can't cancel the
|
|
* ioend directly here. That means we have to mark this page as under
|
|
* writeback if we included any blocks from it in the ioend chain so
|
|
* that completion treats it correctly.
|
|
*
|
|
* If we didn't include the page in the ioend, the on error we can
|
|
* simply discard and unlock it as there are no other users of the page
|
|
* now. The caller will still need to trigger submission of outstanding
|
|
* ioends on the writepage context so they are treated correctly on
|
|
* error.
|
|
*/
|
|
if (unlikely(error)) {
|
|
if (!count) {
|
|
xfs_aops_discard_page(page);
|
|
ClearPageUptodate(page);
|
|
unlock_page(page);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* If the page was not fully cleaned, we need to ensure that the
|
|
* higher layers come back to it correctly. That means we need
|
|
* to keep the page dirty, and for WB_SYNC_ALL writeback we need
|
|
* to ensure the PAGECACHE_TAG_TOWRITE index mark is not removed
|
|
* so another attempt to write this page in this writeback sweep
|
|
* will be made.
|
|
*/
|
|
set_page_writeback_keepwrite(page);
|
|
} else {
|
|
clear_page_dirty_for_io(page);
|
|
set_page_writeback(page);
|
|
}
|
|
|
|
unlock_page(page);
|
|
|
|
/*
|
|
* Preserve the original error if there was one, otherwise catch
|
|
* submission errors here and propagate into subsequent ioend
|
|
* submissions.
|
|
*/
|
|
list_for_each_entry_safe(ioend, next, &submit_list, io_list) {
|
|
int error2;
|
|
|
|
list_del_init(&ioend->io_list);
|
|
error2 = xfs_submit_ioend(wbc, ioend, error);
|
|
if (error2 && !error)
|
|
error = error2;
|
|
}
|
|
|
|
/*
|
|
* We can end up here with no error and nothing to write only if we race
|
|
* with a partial page truncate on a sub-page block sized filesystem.
|
|
*/
|
|
if (!count)
|
|
end_page_writeback(page);
|
|
done:
|
|
mapping_set_error(page->mapping, error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Write out a dirty page.
|
|
*
|
|
* For delalloc space on the page we need to allocate space and flush it.
|
|
* For unwritten space on the page we need to start the conversion to
|
|
* regular allocated space.
|
|
*/
|
|
STATIC int
|
|
xfs_do_writepage(
|
|
struct page *page,
|
|
struct writeback_control *wbc,
|
|
void *data)
|
|
{
|
|
struct xfs_writepage_ctx *wpc = data;
|
|
struct inode *inode = page->mapping->host;
|
|
loff_t offset;
|
|
uint64_t end_offset;
|
|
pgoff_t end_index;
|
|
|
|
trace_xfs_writepage(inode, page, 0, 0);
|
|
|
|
/*
|
|
* Refuse to write the page out if we are called from reclaim context.
|
|
*
|
|
* This avoids stack overflows when called from deeply used stacks in
|
|
* random callers for direct reclaim or memcg reclaim. We explicitly
|
|
* allow reclaim from kswapd as the stack usage there is relatively low.
|
|
*
|
|
* This should never happen except in the case of a VM regression so
|
|
* warn about it.
|
|
*/
|
|
if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) ==
|
|
PF_MEMALLOC))
|
|
goto redirty;
|
|
|
|
/*
|
|
* Given that we do not allow direct reclaim to call us, we should
|
|
* never be called while in a filesystem transaction.
|
|
*/
|
|
if (WARN_ON_ONCE(current->flags & PF_MEMALLOC_NOFS))
|
|
goto redirty;
|
|
|
|
/*
|
|
* Is this page beyond the end of the file?
|
|
*
|
|
* The page index is less than the end_index, adjust the end_offset
|
|
* to the highest offset that this page should represent.
|
|
* -----------------------------------------------------
|
|
* | file mapping | <EOF> |
|
|
* -----------------------------------------------------
|
|
* | Page ... | Page N-2 | Page N-1 | Page N | |
|
|
* ^--------------------------------^----------|--------
|
|
* | desired writeback range | see else |
|
|
* ---------------------------------^------------------|
|
|
*/
|
|
offset = i_size_read(inode);
|
|
end_index = offset >> PAGE_SHIFT;
|
|
if (page->index < end_index)
|
|
end_offset = (xfs_off_t)(page->index + 1) << PAGE_SHIFT;
|
|
else {
|
|
/*
|
|
* Check whether the page to write out is beyond or straddles
|
|
* i_size or not.
|
|
* -------------------------------------------------------
|
|
* | file mapping | <EOF> |
|
|
* -------------------------------------------------------
|
|
* | Page ... | Page N-2 | Page N-1 | Page N | Beyond |
|
|
* ^--------------------------------^-----------|---------
|
|
* | | Straddles |
|
|
* ---------------------------------^-----------|--------|
|
|
*/
|
|
unsigned offset_into_page = offset & (PAGE_SIZE - 1);
|
|
|
|
/*
|
|
* Skip the page if it is fully outside i_size, e.g. due to a
|
|
* truncate operation that is in progress. We must redirty the
|
|
* page so that reclaim stops reclaiming it. Otherwise
|
|
* xfs_vm_releasepage() is called on it and gets confused.
|
|
*
|
|
* Note that the end_index is unsigned long, it would overflow
|
|
* if the given offset is greater than 16TB on 32-bit system
|
|
* and if we do check the page is fully outside i_size or not
|
|
* via "if (page->index >= end_index + 1)" as "end_index + 1"
|
|
* will be evaluated to 0. Hence this page will be redirtied
|
|
* and be written out repeatedly which would result in an
|
|
* infinite loop, the user program that perform this operation
|
|
* will hang. Instead, we can verify this situation by checking
|
|
* if the page to write is totally beyond the i_size or if it's
|
|
* offset is just equal to the EOF.
|
|
*/
|
|
if (page->index > end_index ||
|
|
(page->index == end_index && offset_into_page == 0))
|
|
goto redirty;
|
|
|
|
/*
|
|
* The page straddles i_size. It must be zeroed out on each
|
|
* and every writepage invocation because it may be mmapped.
|
|
* "A file is mapped in multiples of the page size. For a file
|
|
* that is not a multiple of the page size, the remaining
|
|
* memory is zeroed when mapped, and writes to that region are
|
|
* not written out to the file."
|
|
*/
|
|
zero_user_segment(page, offset_into_page, PAGE_SIZE);
|
|
|
|
/* Adjust the end_offset to the end of file */
|
|
end_offset = offset;
|
|
}
|
|
|
|
return xfs_writepage_map(wpc, wbc, inode, page, end_offset);
|
|
|
|
redirty:
|
|
redirty_page_for_writepage(wbc, page);
|
|
unlock_page(page);
|
|
return 0;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_writepage(
|
|
struct page *page,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct xfs_writepage_ctx wpc = { };
|
|
int ret;
|
|
|
|
ret = xfs_do_writepage(page, wbc, &wpc);
|
|
if (wpc.ioend)
|
|
ret = xfs_submit_ioend(wbc, wpc.ioend, ret);
|
|
return ret;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_writepages(
|
|
struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct xfs_writepage_ctx wpc = { };
|
|
int ret;
|
|
|
|
xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED);
|
|
ret = write_cache_pages(mapping, wbc, xfs_do_writepage, &wpc);
|
|
if (wpc.ioend)
|
|
ret = xfs_submit_ioend(wbc, wpc.ioend, ret);
|
|
return ret;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_dax_writepages(
|
|
struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED);
|
|
return dax_writeback_mapping_range(mapping,
|
|
xfs_find_bdev_for_inode(mapping->host), wbc);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_releasepage(
|
|
struct page *page,
|
|
gfp_t gfp_mask)
|
|
{
|
|
trace_xfs_releasepage(page->mapping->host, page, 0, 0);
|
|
return iomap_releasepage(page, gfp_mask);
|
|
}
|
|
|
|
STATIC sector_t
|
|
xfs_vm_bmap(
|
|
struct address_space *mapping,
|
|
sector_t block)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(mapping->host);
|
|
|
|
trace_xfs_vm_bmap(ip);
|
|
|
|
/*
|
|
* The swap code (ab-)uses ->bmap to get a block mapping and then
|
|
* bypasses the file system for actual I/O. We really can't allow
|
|
* that on reflinks inodes, so we have to skip out here. And yes,
|
|
* 0 is the magic code for a bmap error.
|
|
*
|
|
* Since we don't pass back blockdev info, we can't return bmap
|
|
* information for rt files either.
|
|
*/
|
|
if (xfs_is_cow_inode(ip) || XFS_IS_REALTIME_INODE(ip))
|
|
return 0;
|
|
return iomap_bmap(mapping, block, &xfs_iomap_ops);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_readpage(
|
|
struct file *unused,
|
|
struct page *page)
|
|
{
|
|
trace_xfs_vm_readpage(page->mapping->host, 1);
|
|
return iomap_readpage(page, &xfs_iomap_ops);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_readpages(
|
|
struct file *unused,
|
|
struct address_space *mapping,
|
|
struct list_head *pages,
|
|
unsigned nr_pages)
|
|
{
|
|
trace_xfs_vm_readpages(mapping->host, nr_pages);
|
|
return iomap_readpages(mapping, pages, nr_pages, &xfs_iomap_ops);
|
|
}
|
|
|
|
static int
|
|
xfs_iomap_swapfile_activate(
|
|
struct swap_info_struct *sis,
|
|
struct file *swap_file,
|
|
sector_t *span)
|
|
{
|
|
sis->bdev = xfs_find_bdev_for_inode(file_inode(swap_file));
|
|
return iomap_swapfile_activate(sis, swap_file, span, &xfs_iomap_ops);
|
|
}
|
|
|
|
const struct address_space_operations xfs_address_space_operations = {
|
|
.readpage = xfs_vm_readpage,
|
|
.readpages = xfs_vm_readpages,
|
|
.writepage = xfs_vm_writepage,
|
|
.writepages = xfs_vm_writepages,
|
|
.set_page_dirty = iomap_set_page_dirty,
|
|
.releasepage = xfs_vm_releasepage,
|
|
.invalidatepage = xfs_vm_invalidatepage,
|
|
.bmap = xfs_vm_bmap,
|
|
.direct_IO = noop_direct_IO,
|
|
.migratepage = iomap_migrate_page,
|
|
.is_partially_uptodate = iomap_is_partially_uptodate,
|
|
.error_remove_page = generic_error_remove_page,
|
|
.swap_activate = xfs_iomap_swapfile_activate,
|
|
};
|
|
|
|
const struct address_space_operations xfs_dax_aops = {
|
|
.writepages = xfs_dax_writepages,
|
|
.direct_IO = noop_direct_IO,
|
|
.set_page_dirty = noop_set_page_dirty,
|
|
.invalidatepage = noop_invalidatepage,
|
|
.swap_activate = xfs_iomap_swapfile_activate,
|
|
};
|