fs: Assign bdi in super_block

[linux-2.6-block.git] / fs / sync.c

diff --git a/fs/sync.c b/fs/sync.c
index 192340930bb477f506eeee2eb132db06a1a6309f..c08467a5d7cb73d2988157c8c5fa4ab33ee2f48d 100644 (file)
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -27,6 +27,13 @@
  */
 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)
+               return 0;
+
        /* Avoid doing twice syncing and cache pruning for quota sync */
        if (!wait) {
                writeout_quota_sb(sb, -1);
@@ -101,7 +108,7 @@ restart:
                spin_unlock(&sb_lock);
 
                down_read(&sb->s_umount);
-               if (!(sb->s_flags & MS_RDONLY) && sb->s_root)
+               if (!(sb->s_flags & MS_RDONLY) && sb->s_root && sb->s_bdi)
                        __sync_filesystem(sb, wait);
                up_read(&sb->s_umount);