xfs: only bother with sync_filesystem during readonly remount

In commit 02b9984d6408, we pushed a sync_filesystem() call from the VFS
into xfs_fs_remount.  The only time that we ever need to push dirty file
data or metadata to disk for a remount is if we're remounting the
filesystem read only, so this really could be moved to xfs_remount_ro.

Once we've moved the call site, actually check the return value from
sync_filesystem.

Fixes: 02b9984d6408 ("fs: push sync_filesystem() down to the file system's remount_fs()")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index e8f37bd..7c2f133 100644 (file)
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1749,6 +1749,11 @@ xfs_remount_ro(
        };
        int                     error;
 
+       /* Flush all the dirty data to disk. */
+       error = sync_filesystem(mp->m_super);
+       if (error)
+               return error;
+
        /*
         * Cancel background eofb scanning so it cannot race with the final
         * log force+buftarg wait and deadlock the remount.
@@ -1827,8 +1832,6 @@ xfs_fs_reconfigure(
        if (error)
                return error;
 
-       sync_filesystem(mp->m_super);
-
        /* inode32 -> inode64 */
        if (xfs_has_small_inums(mp) && !xfs_has_small_inums(new_mp)) {
                mp->m_features &= ~XFS_FEAT_SMALL_INUMS;