[PATCH] fix for get_sb_bdev() bug

	Grr...  When loop in get_sb_bdev() had been switched from
global list of superblock to per-type one, we should have switched
from sb_entry(p) (aka. list_entry(p, struct super_block, s_list)) to
list_entry(p, struct super_block, s_instances).

	As it is, we end up with false negatives all the time.  I.e.
second mount from the same block device with the same type gices
a new superblock.  With obvious nasty results...

	This fixes that.

diff --git a/fs/super.c b/fs/super.c
index 149e89ec125cc3d922e89b9235a6f5cccd6a08a1..e83164f1063441d43d6e30b1951096912f46fcb5 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -728,7 +728,8 @@ restart:
        spin_lock(&sb_lock);
 
        list_for_each(p, &fs_type->fs_supers) {
-               struct super_block *old = sb_entry(p);
+               struct super_block *old;
+               old = list_entry(p, struct super_block, s_instances);
                if (old->s_bdev != bdev)
                        continue;
                if (!grab_super(old))