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authorDavid Chinner <david@fromorbit.com>2008-10-30 17:07:20 +1100
committerLachlan McIlroy <lachlan@sgi.com>2008-10-30 17:07:20 +1100
commit2f8a3ce1c20f20e6494cdb77fed76bc474ca3ca5 (patch)
tree01322bcb3c1d3bb9f8fd6e170414e5c748b6f77c /fs/xfs
parent75c68f411b1242c8fdaf731078fdd4e77b14981d (diff)
[XFS] don't block in xfs_qm_dqflush() during async writeback.
Normally dquots are written back via delayed write mechanisms. They are flushed to their backing buffer by xfssyncd, which is then pushed out by either AIL or xfsbufd flushing. The flush from the xfssyncd is supposed to be non-blocking, but xfs_qm_dqflush() always waits for pinned duots, which means that it will block for the length of time it takes to do a synchronous log force. This causes unnecessary extra log I/O to be issued whenever we try to flush a busy dquot. Avoid the log forces and blocking xfssyncd by making xfs_qm_dqflush() pay attention to what type of sync it is doing when it sees a pinned dquot and not waiting when doing non-blocking flushes. SGI-PV: 988147 SGI-Modid: xfs-linux-melb:xfs-kern:32287a Signed-off-by: David Chinner <david@fromorbit.com> Signed-off-by: Peter Leckie <pleckie@sgi.com> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/quota/xfs_dquot.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/fs/xfs/quota/xfs_dquot.c b/fs/xfs/quota/xfs_dquot.c
index d3f4fbbe248..1e6bf392564 100644
--- a/fs/xfs/quota/xfs_dquot.c
+++ b/fs/xfs/quota/xfs_dquot.c
@@ -1221,16 +1221,14 @@ xfs_qm_dqflush(
xfs_dqtrace_entry(dqp, "DQFLUSH");
/*
- * If not dirty, nada.
+ * If not dirty, or it's pinned and we are not supposed to
+ * block, nada.
*/
- if (!XFS_DQ_IS_DIRTY(dqp)) {
+ if (!XFS_DQ_IS_DIRTY(dqp) ||
+ (!(flags & XFS_QMOPT_SYNC) && atomic_read(&dqp->q_pincount) > 0)) {
xfs_dqfunlock(dqp);
- return (0);
+ return 0;
}
-
- /*
- * Cant flush a pinned dquot. Wait for it.
- */
xfs_qm_dqunpin_wait(dqp);
/*