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authorDarrick J. Wong <darrick.wong@oracle.com>2019-04-17 08:49:36 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2019-04-23 08:36:23 -0700
commit1fdeaea4d92c69fb9f871a787af6ad00f32eeea7 (patch)
treee98d1575435dd511b7dc778b1010f867ea6a5ea5 /fs/xfs
parent362f5e745ae2ee2be9cf181b3a22917d619b81a1 (diff)
downloadlinux-1fdeaea4d92c69fb9f871a787af6ad00f32eeea7.tar.bz2
xfs: abort unaligned nowait directio early
Dave Chinner noticed that xfs_file_dio_aio_write returns EAGAIN without dropping the IOLOCK when its deciding not to wait, which means that we leak the IOLOCK there. Since we now make unaligned directio always wait, we have the opportunity to bail out before trying to take the lock, which should reduce the overhead of this never-gonna-work case considerably while also solving the dropped lock problem. Reported-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_file.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index a7ceae90110e..76748255f843 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -517,6 +517,9 @@ xfs_file_dio_aio_write(
}
if (iocb->ki_flags & IOCB_NOWAIT) {
+ /* unaligned dio always waits, bail */
+ if (unaligned_io)
+ return -EAGAIN;
if (!xfs_ilock_nowait(ip, iolock))
return -EAGAIN;
} else {
@@ -536,9 +539,6 @@ xfs_file_dio_aio_write(
* xfs_file_aio_write_checks() for other reasons.
*/
if (unaligned_io) {
- /* unaligned dio always waits, bail */
- if (iocb->ki_flags & IOCB_NOWAIT)
- return -EAGAIN;
inode_dio_wait(inode);
} else if (iolock == XFS_IOLOCK_EXCL) {
xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);