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authorMingming Cao <cmm@us.ibm.com>2007-07-31 00:37:46 -0700
committerWilly Tarreau <w@1wt.eu>2007-08-25 17:24:08 +0200
commit61675a5e1944525dba8421aa1fb0f2d075dba4b6 (patch)
treeb3ce563fa6b31ee2375b6105e21028fbdbf589ce
parent017ec3f52da373ba92db9537c9f1487363810a99 (diff)
[PATCH] "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: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Willy Tarreau <w@1wt.eu>
-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 dc2724fa7622..14b0b4991c64 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1397,7 +1397,7 @@ 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);