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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-06-10 07:51:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-06-10 20:21:46 -0700 |
| commit | 8387ff2577eb9ed245df9a39947f66976c6bcd02 (patch) | |
| tree | 79fafcb5777f16e520d1c39e9389039f866b4c6d /drivers/staging | |
| parent | 147d9e7bcad3b8d5465f6eea6292731e7f35dee8 (diff) | |
| download | linux-stable-8387ff2577eb9ed245df9a39947f66976c6bcd02.tar.gz linux-stable-8387ff2577eb9ed245df9a39947f66976c6bcd02.tar.bz2 linux-stable-8387ff2577eb9ed245df9a39947f66976c6bcd02.zip | |
vfs: make the string hashes salt the hash
We always mixed in the parent pointer into the dentry name hash, but we
did it late at lookup time. It turns out that we can simplify that
lookup-time action by salting the hash with the parent pointer early
instead of late.
A few other users of our string hashes also wanted to mix in their own
pointers into the hash, and those are updated to use the same mechanism.
Hash users that don't have any particular initial salt can just use the
NULL pointer as a no-salt.
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: George Spelvin <linux@sciencehorizons.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/lustre/lustre/llite/statahead.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/staging/lustre/lustre/llite/statahead.c b/drivers/staging/lustre/lustre/llite/statahead.c index 6322f88661e8..79d9830b2997 100644 --- a/drivers/staging/lustre/lustre/llite/statahead.c +++ b/drivers/staging/lustre/lustre/llite/statahead.c @@ -174,7 +174,8 @@ static inline int is_omitted_entry(struct ll_statahead_info *sai, __u64 index) * Insert it into sai_entries tail when init. */ static struct ll_sa_entry * -ll_sa_entry_alloc(struct ll_statahead_info *sai, __u64 index, +ll_sa_entry_alloc(struct dentry *parent, + struct ll_statahead_info *sai, __u64 index, const char *name, int len) { struct ll_inode_info *lli; @@ -221,7 +222,8 @@ ll_sa_entry_alloc(struct ll_statahead_info *sai, __u64 index, dname = (char *)entry + sizeof(struct ll_sa_entry); memcpy(dname, name, len); dname[len] = 0; - entry->se_qstr.hash = full_name_hash(name, len); + + entry->se_qstr.hash = full_name_hash(parent, name, len); entry->se_qstr.len = len; entry->se_qstr.name = dname; @@ -902,7 +904,7 @@ static void ll_statahead_one(struct dentry *parent, const char *entry_name, int rc; int rc1; - entry = ll_sa_entry_alloc(sai, sai->sai_index, entry_name, + entry = ll_sa_entry_alloc(parent, sai, sai->sai_index, entry_name, entry_name_len); if (IS_ERR(entry)) return; |