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| author | Christoph Hellwig | 2018-07-18 01:51:52 +0200 |
|---|---|---|
| committer | Darrick J. Wong | 2018-07-31 22:18:09 +0200 |
| commit | e666aa37f4330cb93a5004a89b7a938312e74e36 (patch) | |
| tree | 321bb7db899b5c9f76b6164f8aeaa0ae4f0dad55 /fs/xfs/xfs_iomap.c | |
| parent | xfs: maintain a sequence count for inode fork manipulations (diff) | |
| download | kernel-qcow2-linux-e666aa37f4330cb93a5004a89b7a938312e74e36.tar.gz kernel-qcow2-linux-e666aa37f4330cb93a5004a89b7a938312e74e36.tar.xz kernel-qcow2-linux-e666aa37f4330cb93a5004a89b7a938312e74e36.zip | |
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.c | 5 |
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); } |