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authorDavid Chinner <dgc@sgi.com>2008-03-06 13:43:42 +1100
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-04-18 11:37:32 +1000
commita3f74ffb6d1448d9a8f482e593b80ec15f1695d4 (patch)
treee7a9ea7ba4032340e771605000002da4349719cb /fs/xfs/xfs_trans_buf.c
parent4ae29b4321b99b711bcfde5527c4fbf249eac60f (diff)
[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>
Diffstat (limited to 'fs/xfs/xfs_trans_buf.c')
-rw-r--r--fs/xfs/xfs_trans_buf.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c
index 60b6b898022b..4e5c010f5040 100644
--- a/fs/xfs/xfs_trans_buf.c
+++ b/fs/xfs/xfs_trans_buf.c
@@ -304,7 +304,8 @@ xfs_trans_read_buf(
if (tp == NULL) {
bp = xfs_buf_read_flags(target, blkno, len, flags | BUF_BUSY);
if (!bp)
- return XFS_ERROR(ENOMEM);
+ return (flags & XFS_BUF_TRYLOCK) ?
+ EAGAIN : XFS_ERROR(ENOMEM);
if ((bp != NULL) && (XFS_BUF_GETERROR(bp) != 0)) {
xfs_ioerror_alert("xfs_trans_read_buf", mp,