[patch 08/30] fix UFS superblock alignment issues

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
------------------

From: Eric Sandeen <sandeen@xxxxxxxxxx>

ufs2 fails to mount on x86_64, claiming bad magic.  This is because
ufs_super_block_third's fs_un1 member is padded out by 4 bytes for 8-byte
alignment, pushing down the rest of the struct.

Forcing this to be packed solves it.  I took a quick look over other
on-disk structures and didn't immediately find other problems.  I was able
to mount & ls a populated ufs2 filesystem w/ this change.

Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Cc: Evgeniy Dushistov <dushistov@xxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 include/linux/ufs_fs.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.18.2.orig/include/linux/ufs_fs.h
+++ linux-2.6.18.2/include/linux/ufs_fs.h
@@ -900,7 +900,7 @@ struct ufs_super_block_third {
 			__fs64   fs_csaddr;	/* blk addr of cyl grp summary area */
 			__fs64    fs_pendingblocks;/* blocks in process of being freed */
 			__fs32    fs_pendinginodes;/*inodes in process of being freed */
-		} fs_u2;
+		} __attribute__ ((packed)) fs_u2;
 	} fs_un1;
 	union {
 		struct {

--
-
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