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| author | Eric Sandeen <sandeen@redhat.com> | 2012-04-26 13:10:39 -0500 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2012-05-15 23:34:39 +0200 |
| commit | d7dab39b6e16d5eea78ed3c705d2a2d0772b4f06 (patch) | |
| tree | a2b201b2afd8cd1d278947f7e080ce7457e88814 /fs/ext3/ext3.h | |
| parent | a80b12c3d08dbbf15e6a551e481c32a2df4911f3 (diff) | |
| download | linux-d7dab39b6e16d5eea78ed3c705d2a2d0772b4f06.tar.bz2 | |
ext3: return 32/64-bit dir name hash according to usage type
This is based on commit d1f5273e9adb40724a85272f248f210dc4ce919a
ext4: return 32/64-bit dir name hash according to usage type
by Fan Yong <yong.fan@whamcloud.com>
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 ext3 to return a full 64-bit hash (both major and minor) for
telldir to decrease the chance of hash collisions.
This patch does implement a new ext3_dir_llseek op, because with 64-bit
hashes, nfs will attempt to seek to a hash "offset" which is much
larger than ext3's s_maxbytes. So for dx dirs, we call
generic_file_llseek_size() with the appropriate max hash value as the
maximum seekable size. Otherwise we just pass through to
generic_file_llseek().
Patch-updated-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Patch-updated-by: Eric Sandeen <sandeen@redhat.com>
(blame us if something is not correct)
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext3/ext3.h')
| -rw-r--r-- | fs/ext3/ext3.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ext3/ext3.h b/fs/ext3/ext3.h index b6515fd7e56c..fe5bef7914ea 100644 --- a/fs/ext3/ext3.h +++ b/fs/ext3/ext3.h @@ -920,7 +920,11 @@ struct dx_hash_info u32 *seed; }; -#define EXT3_HTREE_EOF 0x7fffffff + +/* 32 and 64 bit signed EOF for dx directories */ +#define EXT3_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) +#define EXT3_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) + /* * Control parameters used by ext3_htree_next_block |