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xfs: Add async buffered write support

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This adds the async buffered write support to XFS. For async buffered
write requests, the request will return -EAGAIN if the ilock cannot be
obtained immediately.

Signed-off-by: Stefan Roesch <shr@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20220623175157.1715274-15-shr@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stefan Roesch 2022-06-23 10:51:57 -07:00 committed by Jens Axboe
parent 9641506b2d
commit 1aa91d9c99
2 changed files with 9 additions and 7 deletions
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11
fs/xfs/xfs_file.c
View File

@ -410,7 +410,7 @@ restart:
spin_unlock(&ip->i_flags_lock);
out:
return file_modified(file);
return kiocb_modified(iocb);
}
static int
@ -700,12 +700,11 @@ xfs_file_buffered_write(
bool cleared_space = false;
unsigned int iolock;
if (iocb->ki_flags & IOCB_NOWAIT)
return -EOPNOTSUPP;
write_retry:
iolock = XFS_IOLOCK_EXCL;
xfs_ilock(ip, iolock);
ret = xfs_ilock_iocb(iocb, iolock);
if (ret)
return ret;
ret = xfs_file_write_checks(iocb, from, &iolock);
if (ret)
@ -1165,7 +1164,7 @@ xfs_file_open(
{
if (xfs_is_shutdown(XFS_M(inode->i_sb)))
return -EIO;
file->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC;
file->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC | FMODE_BUF_WASYNC;
return generic_file_open(inode, file);
}

5
fs/xfs/xfs_iomap.c
View File

@ -886,6 +886,7 @@ xfs_buffered_write_iomap_begin(
bool eof = false, cow_eof = false, shared = false;
int allocfork = XFS_DATA_FORK;
int error = 0;
unsigned int lockmode = XFS_ILOCK_EXCL;
if (xfs_is_shutdown(mp))
return -EIO;
@ -897,7 +898,9 @@ xfs_buffered_write_iomap_begin(
ASSERT(!XFS_IS_REALTIME_INODE(ip));
xfs_ilock(ip, XFS_ILOCK_EXCL);
error = xfs_ilock_for_iomap(ip, flags, &lockmode);
if (error)
return error;
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(&ip->i_df)) ||
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {