linux-ext4 - [patch 023/109] "ext4_ext_put_in_cache" uses _

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Message-Id: <200707310737.l6V7bk50021902@imap1.linux-foundation.org>
Date:	Tue, 31 Jul 2007 00:37:46 -0700
From:	akpm@...ux-foundation.org
To:	torvalds@...ux-foundation.org
Cc:	akpm@...ux-foundation.org, cmm@...ibm.com,
	linux-ext4@...r.kernel.org, stable@...nel.org, yanzheng@...n.com
Subject: [patch 023/109] "ext4_ext_put_in_cache" uses __u32 to receive physical block number

From: Mingming Cao <cmm@...ibm.com>

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 <cmm@...ibm.com>
Cc: Yan Zheng <yanzheng@...n.com>
Cc: <stable@...nel.org>
Cc: <linux-ext4@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 fs/ext4/extents.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN fs/ext4/extents.c~ext4_ext_put_in_cache-uses-__u32-to-receive-physical fs/ext4/extents.c
--- 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);
_
-
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