vfs: Move noop_backing_dev_info check from sync into writeback

In principle, a filesystem may want to have ->sync_fs() called during sync(1)
although it does not have a bdi (i.e. s_bdi is set to noop_backing_dev_info).
Only writeback code really needs bdi set to something reasonable. So move the
checks where they are more logical.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 7 deletions

diff --git a/fs/sync.c b/fs/sync.c
index 11e3d1c44901..b3d2a001293f 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -29,13 +29,6 @@
  */
 static int __sync_filesystem(struct super_block *sb, int wait)
 {
-        /*
-         * This should be safe, as we require bdi backing to actually
-         * write out data in the first place
-         */
-        if (sb->s_bdi == &noop_backing_dev_info)
-                return 0;
-
         if (sb->s_qcop && sb->s_qcop->quota_sync)
                 sb->s_qcop->quota_sync(sb, -1, wait);