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>

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 98a9cb5..6db1fef 100644 (file)
--- 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);
                        /*