X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fsync.c;h=d104591b066bf474f62f665e87e04154c4da5da1;hb=066b3aa8454bee3cdc665d86b5de812d8d0513b3;hp=192340930bb477f506eeee2eb132db06a1a6309f;hpb=2daea67e966dc0c42067ebea015ddac6834cef88;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/sync.c b/fs/sync.c
index 1923409..d104591 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);
 
@@ -176,6 +183,7 @@ int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
 		ret = err;
 	return ret;
 }
+EXPORT_SYMBOL(file_fsync);
 
 /**
  * vfs_fsync_range - helper to sync a range of data & metadata to disk