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authorDave Chinner <dchinner@redhat.com>2012-03-22 05:15:11 +0000
committerBen Myers <bpm@sgi.com>2012-03-26 17:47:24 -0500
commit3948659e30808fbaa7673bbe89de2ae9769e20a7 (patch)
tree06ff528be9bd33a4f2579fb05514460b7fa1ec8a /fs/xfs
parent5132ba8f2b7705fb6b06fa6ad3d009233c816b67 (diff)
downloadop-kernel-dev-3948659e30808fbaa7673bbe89de2ae9769e20a7.zip
op-kernel-dev-3948659e30808fbaa7673bbe89de2ae9769e20a7.tar.gz
xfs: Account log unmount transaction correctly
There have been a few reports of this warning appearing recently: XFS (dm-4): xlog_space_left: head behind tail tail_cycle = 129, tail_bytes = 20163072 GH cycle = 129, GH bytes = 20162880 The common cause appears to be lots of freeze and unfreeze cycles, and the output from the warnings indicates that we are leaking around 8 bytes of log space per freeze/unfreeze cycle. When we freeze the filesystem, we write an unmount record and that uses xlog_write directly - a special type of transaction, effectively. What it doesn't do, however, is correctly account for the log space it uses. The unmount record writes an 8 byte structure with a special magic number into the log, and the space this consumes is not accounted for in the log ticket tracking the operation. Hence we leak 8 bytes every unmount record that is written. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_log.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 98a9cb5..6db1fef 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -726,8 +726,9 @@ xfs_log_unmount_write(xfs_mount_t *mp)
.lv_iovecp = &reg,
};
- /* remove inited flag */
+ /* remove inited flag, and account for space used */
tic->t_flags = 0;
+ tic->t_curr_res -= sizeof(magic);
error = xlog_write(log, &vec, tic, &lsn,
NULL, XLOG_UNMOUNT_TRANS);
/*
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