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authorMingming Cao <cmm@us.ibm.com>2007-07-31 03:37:46 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-31 18:39:37 -0400
commitdd54567a83057821a667109a5cadec6eed0295de (patch)
tree88e06af13f4ba9db1fb61b2ebb5453e80ccd14c5 /fs/ext4
parent6676ae62822f189e7bca80526eca514c399adcfc (diff)
"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 'fs/ext4')
-rw-r--r--fs/ext4/extents.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 750c46f7d893..78beb096f57d 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1544,7 +1544,7 @@ int ext4_ext_walk_space(struct inode *inode, unsigned long block,
1544 1544
1545static void 1545static void
1546ext4_ext_put_in_cache(struct inode *inode, __u32 block, 1546ext4_ext_put_in_cache(struct inode *inode, __u32 block,
1547 __u32 len, __u32 start, int type) 1547 __u32 len, ext4_fsblk_t start, int type)
1548{ 1548{
1549 struct ext4_ext_cache *cex; 1549 struct ext4_ext_cache *cex;
1550 BUG_ON(len == 0); 1550 BUG_ON(len == 0);