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| author | Fan Yong <yong.fan@whamcloud.com> | 2012-03-19 03:44:40 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-03-19 03:44:40 +0100 |
| commit | d1f5273e9adb40724a85272f248f210dc4ce919a (patch) | |
| tree | 1ddb119dab8247ab7d7774394094c61161013f2a /fs/ext4/ext4.h | |
| parent | fs: add new FMODE flags: FMODE_32bithash and FMODE_64bithash (diff) | |
| download | linux-d1f5273e9adb40724a85272f248f210dc4ce919a.tar.xz linux-d1f5273e9adb40724a85272f248f210dc4ce919a.zip | |
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/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 513004fc3d84..8b64a00502a0 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1612,7 +1612,11 @@ struct dx_hash_info u32 *seed; }; -#define EXT4_HTREE_EOF 0x7fffffff + +/* 32 and 64 bit signed EOF for dx directories */ +#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) +#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) + /* * Control parameters used by ext4_htree_next_block |