This is a note to let you know that we have just queued up the patch titled

     Subject: "ext4_ext_put_in_cache" uses __u32 to receive physical block number

to the 2.6.22-stable tree.  Its filename is

     ext4_ext_put_in_cache-uses-__u32-to-receive-physical-block-number.patch

A git repo of this tree can be found at 
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

From stable-bounces@linux.kernel.org Tue Jul 31 00:48:13 2007

From: Mingming Cao <redacted>
Date: Tue, 31 Jul 2007 00:37:46 -0700
Subject: "ext4_ext_put_in_cache" uses __u32 to receive physical block number
To: torvalds@linux-foundation.org
Cc: akpm@linux-foundation.org, linux-ext4@vger.kernel.org, cmm@us.ibm.com, stable@kernel.org, yanzheng@21cn.com
Message-ID: [ref]


From: Mingming Cao <redacted>

Yan Zheng wrote:

I think I found a bug in ext4/extents.c, "ext4_ext_put_in_cache" uses
"__u32" to receive physical block number.  "ext4_ext_put_in_cache" is
used in "ext4_ext_get_blocks", it sets ext4 inode's extent cache
according most recently tree lookup (higher 16 bits of saved physical
block number are always zero). when serving a mapping request,
"ext4_ext_get_blocks" first check whether the logical block is in
inode's extent cache. if the logical block is in the cache and the
cached region isn't a gap, "ext4_ext_get_blocks" gets physical block
number by using cached region's physical block number and offset in
the cached region.  as described above, "ext4_ext_get_blocks" may
return wrong result when there are physical block numbers bigger than
0xffffffff.

You are right.  Thanks for reporting this!

Signed-off-by: Mingming Cao <redacted>
Cc: Yan Zheng <redacted>
Cc: <redacted>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

--- a/fs/ext4/extents.c~ext4_ext_put_in_cache-uses-__u32-to-receive-physical
+++ a/fs/ext4/extents.c

@@ -1544,7 +1544,7 @@ int ext4_ext_walk_space(struct inode *in
 
 static void
 ext4_ext_put_in_cache(struct inode *inode, __u32 block,
-			__u32 len, __u32 start, int type)
+			__u32 len, ext4_fsblk_t start, int type)
 {
 	struct ext4_ext_cache *cex;
 	BUG_ON(len == 0);

_

_______________________________________________
stable mailing list
stable@linux.kernel.org
http://linux.kernel.org/mailman/listinfo/stable



Patches currently in stable-queue which might be from cmm@us.ibm.com are

queue-2.6.22/ext4_ext_put_in_cache-uses-__u32-to-receive-physical-block-number.patch