summaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_iomap.c
diff options
context:
space:
mode:
authorChristoph Hellwig <hch@lst.de>2018-07-17 16:51:52 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2018-07-31 13:18:09 -0700
commite666aa37f4330cb93a5004a89b7a938312e74e36 (patch)
tree321bb7db899b5c9f76b6164f8aeaa0ae4f0dad55 /fs/xfs/xfs_iomap.c
parent745b3f76d1c889d738a1c4537a3c491bc1ecac4d (diff)
downloadlinux-e666aa37f4330cb93a5004a89b7a938312e74e36.tar.bz2
xfs: avoid COW fork extent lookups in writeback if the fork didn't change
Used the per-fork sequence counter to avoid lookups in the writeback code unless the COW fork actually changed. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs/xfs_iomap.c')
-rw-r--r--fs/xfs/xfs_iomap.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 8e8ca9f03f0e..3282575e2df4 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -651,7 +651,8 @@ xfs_iomap_write_allocate(
xfs_inode_t *ip,
int whichfork,
xfs_off_t offset,
- xfs_bmbt_irec_t *imap)
+ xfs_bmbt_irec_t *imap,
+ unsigned int *cow_seq)
{
xfs_mount_t *mp = ip->i_mount;
xfs_fileoff_t offset_fsb, last_block;
@@ -766,6 +767,8 @@ xfs_iomap_write_allocate(
if (error)
goto error0;
+ if (whichfork == XFS_COW_FORK)
+ *cow_seq = XFS_IFORK_PTR(ip, whichfork)->if_seq;
xfs_iunlock(ip, XFS_ILOCK_EXCL);
}