tomoyo: improve hash bucket dispersion
When examining the network device name hash, it was discovered that
the low order bits of full_name_hash() are not very well dispersed
across the possible values. When used by filesystem code, this is handled
by folding with the function hash_long().
The only other non-filesystem usage of full_name_hash() at this time
appears to be in TOMOYO. This patch should fix that.
I do not use TOMOYO at this time, so this patch is build tested only.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index 5f2e332..917f564 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -13,6 +13,8 @@
#include <linux/mount.h>
#include <linux/mnt_namespace.h>
#include <linux/fs_struct.h>
+#include <linux/hash.h>
+
#include "common.h"
#include "realpath.h"
@@ -263,7 +265,8 @@
* table. Frequency of appending strings is very low. So we don't need
* large (e.g. 64k) hash size. 256 will be sufficient.
*/
-#define TOMOYO_MAX_HASH 256
+#define TOMOYO_HASH_BITS 8
+#define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS)
/*
* tomoyo_name_entry is a structure which is used for linking
@@ -315,6 +318,7 @@
struct tomoyo_free_memory_block_list *fmb;
int len;
char *cp;
+ struct list_head *head;
if (!name)
return NULL;
@@ -325,9 +329,10 @@
return NULL;
}
hash = full_name_hash((const unsigned char *) name, len - 1);
+ head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)];
+
mutex_lock(&lock);
- list_for_each_entry(ptr, &tomoyo_name_list[hash % TOMOYO_MAX_HASH],
- list) {
+ list_for_each_entry(ptr, head, list) {
if (hash == ptr->entry.hash && !strcmp(name, ptr->entry.name))
goto out;
}
@@ -365,7 +370,7 @@
tomoyo_fill_path_info(&ptr->entry);
fmb->ptr += len;
fmb->len -= len;
- list_add_tail(&ptr->list, &tomoyo_name_list[hash % TOMOYO_MAX_HASH]);
+ list_add_tail(&ptr->list, head);
if (fmb->len == 0) {
list_del(&fmb->list);
kfree(fmb);