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btrfs: plumb NOWAIT through the write path

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We have everywhere setup for nowait, plumb NOWAIT through the write path.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Stefan Roesch <shr@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Stefan Roesch 2022-09-12 12:27:49 -07:00 committed by David Sterba
parent 2fcab928cc
commit 304e45acdb
1 changed files with 13 additions and 6 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

19
fs/btrfs/file.c
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@ -1652,8 +1652,9 @@ static noinline ssize_t btrfs_buffered_write(struct kiocb *iocb,
bool force_page_uptodate = false;
loff_t old_isize = i_size_read(inode);
unsigned int ilock_flags = 0;
const bool nowait = (iocb->ki_flags & IOCB_NOWAIT);
if (iocb->ki_flags & IOCB_NOWAIT)
if (nowait)
ilock_flags |= BTRFS_ILOCK_TRY;
ret = btrfs_inode_lock(inode, ilock_flags);
@ -1709,17 +1710,22 @@ static noinline ssize_t btrfs_buffered_write(struct kiocb *iocb,
extent_changeset_release(data_reserved);
ret = btrfs_check_data_free_space(BTRFS_I(inode),
&data_reserved, pos,
write_bytes, false);
write_bytes, nowait);
if (ret < 0) {
int can_nocow;
if (nowait && (ret == -ENOSPC || ret == -EAGAIN)) {
ret = -EAGAIN;
break;
}
/*
* If we don't have to COW at the offset, reserve
* metadata only. write_bytes may get smaller than
* requested here.
*/
can_nocow = btrfs_check_nocow_lock(BTRFS_I(inode), pos,
&write_bytes, false);
&write_bytes, nowait);
if (can_nocow < 0)
ret = can_nocow;
if (can_nocow > 0)
@ -1736,7 +1742,7 @@ static noinline ssize_t btrfs_buffered_write(struct kiocb *iocb,
WARN_ON(reserve_bytes == 0);
ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode),
reserve_bytes,
reserve_bytes, false);
reserve_bytes, nowait);
if (ret) {
if (!only_release_metadata)
btrfs_free_reserved_data_space(BTRFS_I(inode),
@ -1765,10 +1771,11 @@ static noinline ssize_t btrfs_buffered_write(struct kiocb *iocb,
extents_locked = lock_and_cleanup_extent_if_need(
BTRFS_I(inode), pages,
num_pages, pos, write_bytes, &lockstart,
&lockend, false, &cached_state);
&lockend, nowait, &cached_state);
if (extents_locked < 0) {
if (extents_locked == -EAGAIN)
if (!nowait && extents_locked == -EAGAIN)
goto again;
btrfs_delalloc_release_extents(BTRFS_I(inode),
reserve_bytes);
ret = extents_locked;