xfs: flush dirty data and drain directios before scrubbing cow fork

When we're scrubbing the COW fork, we need to take MMAPLOCK_EXCL to
prevent page_mkwrite from modifying any inode state.  The ILOCK should
suffice to avoid confusing online fsck, but let's take the same locks
that we do everywhere else.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c
index 87ab9f9..69bc89d 100644 (file)
--- a/fs/xfs/scrub/bmap.c
+++ b/fs/xfs/scrub/bmap.c
@@ -42,12 +42,12 @@ xchk_setup_inode_bmap(
        xfs_ilock(sc->ip, XFS_IOLOCK_EXCL);
 
        /*
-        * We don't want any ephemeral data fork updates sitting around
+        * We don't want any ephemeral data/cow fork updates sitting around
         * while we inspect block mappings, so wait for directio to finish
         * and flush dirty data if we have delalloc reservations.
         */
        if (S_ISREG(VFS_I(sc->ip)->i_mode) &&
-           sc->sm->sm_type == XFS_SCRUB_TYPE_BMBTD) {
+           sc->sm->sm_type != XFS_SCRUB_TYPE_BMBTA) {
                struct address_space    *mapping = VFS_I(sc->ip)->i_mapping;
 
                sc->ilock_flags |= XFS_MMAPLOCK_EXCL;