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Convert uid hash to hlist 

Surprisingly, but (spotted by Alexey Dobriyan) the uid hash still uses
list_heads, thus occupying twice as much place as it could.  Convert it to
hlist_heads.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pavel Emelyanov 2007-09-18 22:46:44 -07:00 committed by Linus Torvalds
parent d8a4821dca
commit 735de2230f
4 changed files with 11 additions and 10 deletions
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2
include/linux/sched.h
View File

@ -593,7 +593,7 @@ struct user_struct {
#endif
/* Hash table maintenance information */
struct list_head uidhash_list;
struct hlist_node uidhash_node;
uid_t uid;
};

2
include/linux/user_namespace.h
View File

@ -11,7 +11,7 @@
struct user_namespace {
struct kref kref;
struct list_head uidhash_table[UIDHASH_SZ];
struct hlist_head uidhash_table[UIDHASH_SZ];
struct user_struct *root_user;
};

15
kernel/user.c
View File

@ -55,21 +55,22 @@ struct user_struct root_user = {
/*
* These routines must be called with the uidhash spinlock held!
*/
static inline void uid_hash_insert(struct user_struct *up, struct list_head *hashent)
static inline void uid_hash_insert(struct user_struct *up, struct hlist_head *hashent)
{
list_add(&up->uidhash_list, hashent);
hlist_add_head(&up->uidhash_node, hashent);
}
static inline void uid_hash_remove(struct user_struct *up)
{
list_del(&up->uidhash_list);
hlist_del(&up->uidhash_node);
}
static inline struct user_struct *uid_hash_find(uid_t uid, struct list_head *hashent)
static inline struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
{
struct user_struct *user;
struct hlist_node *h;
list_for_each_entry(user, hashent, uidhash_list) {
hlist_for_each_entry(user, h, hashent, uidhash_node) {
if(user->uid == uid) {
atomic_inc(&user->__count);
return user;
@ -118,7 +119,7 @@ void free_uid(struct user_struct *up)
struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid)
{
struct list_head *hashent = uidhashentry(ns, uid);
struct hlist_head *hashent = uidhashentry(ns, uid);
struct user_struct *up;
spin_lock_irq(&uidhash_lock);
@ -207,7 +208,7 @@ static int __init uid_cache_init(void)
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
for(n = 0; n < UIDHASH_SZ; ++n)
INIT_LIST_HEAD(init_user_ns.uidhash_table + n);
INIT_HLIST_HEAD(init_user_ns.uidhash_table + n);
/* Insert the root user immediately (init already runs as root) */
spin_lock_irq(&uidhash_lock);

2
kernel/user_namespace.c
View File

@ -39,7 +39,7 @@ static struct user_namespace *clone_user_ns(struct user_namespace *old_ns)
kref_init(&ns->kref);
for (n = 0; n < UIDHASH_SZ; ++n)
INIT_LIST_HEAD(ns->uidhash_table + n);
INIT_HLIST_HEAD(ns->uidhash_table + n);
/* Insert new root user. */
ns->root_user = alloc_uid(ns, 0);