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author | Mingming Cao <cmm@us.ibm.com> | 2007-07-31 07:37:46 (GMT) |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-31 22:39:37 (GMT) |
commit | dd54567a83057821a667109a5cadec6eed0295de (patch) | |
tree | 88e06af13f4ba9db1fb61b2ebb5453e80ccd14c5 /Documentation/DocBook/kernel-api.tmpl | |
parent | 6676ae62822f189e7bca80526eca514c399adcfc (diff) | |
download | linux-dd54567a83057821a667109a5cadec6eed0295de.tar.xz |
"ext4_ext_put_in_cache" uses __u32 to receive physical block number
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@us.ibm.com>
Cc: Yan Zheng <yanzheng@21cn.com>
Cc: <stable@kernel.org>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/DocBook/kernel-api.tmpl')
0 files changed, 0 insertions, 0 deletions