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| author | Fan Yong <yong.fan@whamcloud.com> | 2012-03-18 22:44:40 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-03-18 22:44:40 -0400 |
| commit | d1f5273e9adb40724a85272f248f210dc4ce919a (patch) | |
| tree | 1ddb119dab8247ab7d7774394094c61161013f2a /fs/ext4/hash.c | |
| parent | 6a8a13e03861c0ab83ab07d573ca793cff0e5d00 (diff) | |
| download | linux-d1f5273e9adb40724a85272f248f210dc4ce919a.tar.gz | |
ext4: return 32/64-bit dir name hash according to usage type
Traditionally ext2/3/4 has returned a 32-bit hash value from llseek() to appease NFSv2, which can only handle a 32-bit cookie for seekdir() and telldir(). However, this causes problems if there are 32-bit hash collisions, since the NFSv2 server can get stuck resending the same entries from the directory repeatedly. Allow ext4 to return a full 64-bit hash (both major and minor) for telldir to decrease the chance of hash collisions. This still needs integration on the NFS side. Patch-updated-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de> (blame me if something is not correct) Signed-off-by: Fan Yong <yong.fan@whamcloud.com> Signed-off-by: Andreas Dilger <adilger@whamcloud.com> Signed-off-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/hash.c')
| -rw-r--r-- | fs/ext4/hash.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/hash.c b/fs/ext4/hash.c index ac8f168c8ab4..fa8e4911d354 100644 --- a/fs/ext4/hash.c +++ b/fs/ext4/hash.c @@ -200,8 +200,8 @@ int ext4fs_dirhash(const char *name, int len, struct dx_hash_info *hinfo) return -1; } hash = hash & ~1; - if (hash == (EXT4_HTREE_EOF << 1)) - hash = (EXT4_HTREE_EOF-1) << 1; + if (hash == (EXT4_HTREE_EOF_32BIT << 1)) + hash = (EXT4_HTREE_EOF_32BIT - 1) << 1; hinfo->hash = hash; hinfo->minor_hash = minor_hash; return 0; |