[XFS] Don't block pdflush when writing back inodes
When pdflush is writing back inodes, it can get stuck on inode cluster
buffers that are currently under I/O. This occurs when we write data to
multiple inodes in the same inode cluster at the same time.
Effectively, delayed allocation marks the inode dirty during the data
writeback. Hence if the inode cluster was flushed during the writeback of
the first inode, the writeback of the second inode will block waiting for
the inode cluster write to complete before writing it again for the newly
dirtied inode.
Basically, we want to avoid this from happening so we don't block pdflush
and slow down all of writeback. Hence we introduce a non-blocking async
inode flush flag that pdflush uses. If this flag is set, we use
non-blocking operations (e.g. try locks) whereever we can to avoid
blocking or extra I/O being issued.
SGI-PV: 970925
SGI-Modid: xfs-linux-melb:xfs-kern:30501a
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index eaa0189..c3bfffc 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -457,6 +457,7 @@
#define XFS_IFLUSH_SYNC 3
#define XFS_IFLUSH_ASYNC 4
#define XFS_IFLUSH_DELWRI 5
+#define XFS_IFLUSH_ASYNC_NOBLOCK 6
/*
* Flags for xfs_itruncate_start().
@@ -511,7 +512,7 @@
*/
int xfs_itobp(struct xfs_mount *, struct xfs_trans *,
xfs_inode_t *, struct xfs_dinode **, struct xfs_buf **,
- xfs_daddr_t, uint);
+ xfs_daddr_t, uint, uint);
int xfs_iread(struct xfs_mount *, struct xfs_trans *, xfs_ino_t,
xfs_inode_t **, xfs_daddr_t, uint);
int xfs_iread_extents(struct xfs_trans *, xfs_inode_t *, int);