X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=fs%2Fsync.c;h=c08467a5d7cb73d2988157c8c5fa4ab33ee2f48d;hb=32a88aa1b6dfb901cec64e1898cac78d0f25028a;hp=192340930bb477f506eeee2eb132db06a1a6309f;hpb=c4a77a6c7dcff04a2abc7fe4b6b2ae605be41c5b;p=linux-2.6-block.git

diff --git a/fs/sync.c b/fs/sync.c
index 192340930bb4..c08467a5d7cb 100644
--- 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);