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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016-2025 Christoph Hellwig.
* All Rights Reserved.
*/
#include "xfs_platform.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_iomap.h"
#include "xfs_trace.h"
#include "xfs_bmap_util.h"
#include "xfs_reflink.h"
#include "xfs_zone_alloc.h"
#include "xfs_ioend.h"
static void
xfs_ioend_put_open_zones(
struct iomap_ioend *ioend)
{
struct iomap_ioend *tmp;
/*
* Put the open zone for all ioends merged into this one (if any).
*/
list_for_each_entry(tmp, &ioend->io_list, io_list)
xfs_open_zone_put(tmp->io_private);
/*
* The main ioend might not have an open zone if the submission failed
* before xfs_zone_alloc_and_submit got called.
*/
if (ioend->io_private)
xfs_open_zone_put(ioend->io_private);
}
static void
xfs_end_ioend_write(
struct iomap_ioend *ioend)
{
struct xfs_inode *ip = XFS_I(ioend->io_inode);
struct xfs_mount *mp = ip->i_mount;
bool is_zoned = xfs_is_zoned_inode(ip);
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 structures if the fs has been shut down.
*/
if (xfs_is_shutdown(mp)) {
error = -EIO;
goto done;
}
/*
* Clean up all COW blocks and underlying data fork delalloc blocks on
* I/O error. The delalloc punch is required because this ioend was
* mapped to blocks in the COW fork and the associated pages are no
* longer dirty. If we don't remove delalloc blocks here, they become
* stale and can corrupt free space accounting on unmount.
*/
error = blk_status_to_errno(ioend->io_bio.bi_status);
if (unlikely(error)) {
/*
* Zoned writes update the in-core open zone accounting before
* I/O submission. A failed write leaves that state
* inconsistent, so shut down the filesystem instead of letting
* later writers wait forever for open zone space to become
* available.
*/
if (is_zoned) {
xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
goto done;
}
if (ioend->io_flags & IOMAP_IOEND_SHARED) {
ASSERT(!is_zoned);
xfs_reflink_cancel_cow_range(ip, offset, size, true);
xfs_bmap_punch_delalloc_range(ip, XFS_DATA_FORK, offset,
offset + size, NULL);
}
goto done;
}
/*
* Success: commit the COW or unwritten blocks if needed.
*/
if (is_zoned)
error = xfs_zoned_end_io(ip, offset, size, ioend->io_sector,
ioend->io_private, NULLFSBLOCK);
else if (ioend->io_flags & IOMAP_IOEND_SHARED)
error = xfs_reflink_end_cow(ip, offset, size);
else if (ioend->io_flags & IOMAP_IOEND_UNWRITTEN)
error = xfs_iomap_write_unwritten(ip, offset, size, false);
if (!error &&
!(ioend->io_flags & IOMAP_IOEND_DIRECT) &&
xfs_ioend_is_append(ioend))
error = xfs_setfilesize(ip, offset, size);
done:
if (is_zoned)
xfs_ioend_put_open_zones(ioend);
iomap_finish_ioends(ioend, error);
memalloc_nofs_restore(nofs_flag);
}
/*
* Finish all pending IO completions that require transactional modifications.
*
* We try to merge physical and logically contiguous ioends before completion to
* minimise the number of transactions we need to perform during IO completion.
* Both unwritten extent conversion and COW remapping need to iterate and modify
* one physical extent at a time, so we gain nothing by merging physically
* discontiguous extents here.
*
* The ioend chain length that we can be processing here is largely unbound in
* length and we may have to perform significant amounts of work on each ioend
* to complete it. Hence we have to be careful about holding the CPU for too
* long in this loop.
*/
void
xfs_end_io(
struct work_struct *work)
{
struct xfs_inode *ip =
container_of(work, struct xfs_inode, i_ioend_work);
struct iomap_ioend *ioend;
struct list_head tmp;
unsigned long flags;
spin_lock_irqsave(&ip->i_ioend_lock, flags);
list_replace_init(&ip->i_ioend_list, &tmp);
spin_unlock_irqrestore(&ip->i_ioend_lock, flags);
iomap_sort_ioends(&tmp);
while ((ioend = list_first_entry_or_null(&tmp, struct iomap_ioend,
io_list))) {
list_del_init(&ioend->io_list);
iomap_ioend_try_merge(ioend, &tmp);
if (bio_op(&ioend->io_bio) == REQ_OP_READ)
iomap_finish_ioends(ioend,
blk_status_to_errno(ioend->io_bio.bi_status));
else
xfs_end_ioend_write(ioend);
cond_resched();
}
}
void
xfs_end_bio(
struct bio *bio)
{
struct iomap_ioend *ioend = iomap_ioend_from_bio(bio);
struct xfs_inode *ip = XFS_I(ioend->io_inode);
struct xfs_mount *mp = ip->i_mount;
unsigned long flags;
/*
* For Appends record the actually written block number and set the
* boundary flag if needed.
*/
if (IS_ENABLED(CONFIG_XFS_RT) && bio_is_zone_append(bio)) {
ioend->io_sector = bio->bi_iter.bi_sector;
xfs_mark_rtg_boundary(ioend);
}
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);
}
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