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"ext4_ext_put_in_cache" uses __u32 to receive physical block number

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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 <[email protected]>
Cc: Yan Zheng <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mingming Cao 2007-07-31 00:37:46 -07:00 • committed by Linus Torvalds
commit dd54567a83
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/extents.c
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@ -1544,7 +1544,7 @@ int ext4_ext_walk_space(struct inode *inode, unsigned long block,
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);