From a3f74ffb6d1448d9a8f482e593b80ec15f1695d4 Mon Sep 17 00:00:00 2001 From: David Chinner Date: Thu, 6 Mar 2008 13:43:42 +1100 Subject: [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 Signed-off-by: Lachlan McIlroy --- fs/xfs/xfs_inode.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'fs/xfs/xfs_inode.h') diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index eaa01895ff93..c3bfffca9214 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -457,6 +457,7 @@ xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags) #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_finish_reclaim_all(struct xfs_mount *, int); */ 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); -- cgit v1.2.3