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authorEric Sandeen <sandeen@sandeen.net>2017-08-08 18:19:47 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2017-08-22 09:22:23 -0700
commit757a69ef6cf2bf839bd4088e5609ddddd663b0c4 (patch)
tree801c716342adc835f8400b3b057f02124b12bea6 /fs/xfs
parent6470812e22261d2342ef1597be62e63a0423d691 (diff)
xfs: write unmount record for ro mounts
There are dueling comments in the xfs code about intent for log writes when unmounting a readonly filesystem. In xfs_mountfs, we see the intent: /* * Now the log is fully replayed, we can transition to full read-only * mode for read-only mounts. This will sync all the metadata and clean * the log so that the recovery we just performed does not have to be * replayed again on the next mount. */ and it calls xfs_quiesce_attr(), but by the time we get to xfs_log_unmount_write(), it returns early for a RDONLY mount: * Don't write out unmount record on read-only mounts. Because of this, sequential ro mounts of a filesystem with a dirty log will replay the log each time, which seems odd. Fix this by writing an unmount record even for RO mounts, as long as norecovery wasn't specified (don't write a clean log record if a dirty log may still be there!) and the log device is writable. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_log.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 4ebd0bafc914..972eda87db2b 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -812,11 +812,14 @@ xfs_log_unmount_write(xfs_mount_t *mp)
int error;
/*
- * Don't write out unmount record on read-only mounts.
+ * Don't write out unmount record on norecovery mounts or ro devices.
* Or, if we are doing a forced umount (typically because of IO errors).
*/
- if (mp->m_flags & XFS_MOUNT_RDONLY)
+ if (mp->m_flags & XFS_MOUNT_NORECOVERY ||
+ xfs_readonly_buftarg(log->l_mp->m_logdev_targp)) {
+ ASSERT(mp->m_flags & XFS_MOUNT_RDONLY);
return 0;
+ }
error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL);
ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log)));