diff options
Diffstat (limited to 'security/selinux/ss/hashtab.h')
-rw-r--r-- | security/selinux/ss/hashtab.h | 63 |
1 files changed, 58 insertions, 5 deletions
diff --git a/security/selinux/ss/hashtab.h b/security/selinux/ss/hashtab.h index 4885234257d4..3c952f0f01f9 100644 --- a/security/selinux/ss/hashtab.h +++ b/security/selinux/ss/hashtab.h @@ -11,7 +11,11 @@ #ifndef _SS_HASHTAB_H_ #define _SS_HASHTAB_H_ -#define HASHTAB_MAX_NODES 0xffffffff +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/sched.h> + +#define HASHTAB_MAX_NODES U32_MAX struct hashtab_key_params { u32 (*hash)(const void *key); /* hash function */ @@ -43,6 +47,9 @@ struct hashtab_info { */ int hashtab_init(struct hashtab *h, u32 nel_hint); +int __hashtab_insert(struct hashtab *h, struct hashtab_node **dst, + void *key, void *datum); + /* * Inserts the specified (key, datum) pair into the specified hash table. * @@ -51,8 +58,34 @@ int hashtab_init(struct hashtab *h, u32 nel_hint); * -EINVAL for general errors or 0 otherwise. */ -int hashtab_insert(struct hashtab *h, void *k, void *d, - struct hashtab_key_params key_params); +static inline int hashtab_insert(struct hashtab *h, void *key, void *datum, + struct hashtab_key_params key_params) +{ + u32 hvalue; + struct hashtab_node *prev, *cur; + + cond_resched(); + + if (!h->size || h->nel == HASHTAB_MAX_NODES) + return -EINVAL; + + hvalue = key_params.hash(key) & (h->size - 1); + prev = NULL; + cur = h->htable[hvalue]; + while (cur) { + int cmp = key_params.cmp(key, cur->key); + + if (cmp == 0) + return -EEXIST; + if (cmp < 0) + break; + prev = cur; + cur = cur->next; + } + + return __hashtab_insert(h, prev ? &prev->next : &h->htable[hvalue], + key, datum); +} /* * Searches for the entry with the specified key in the hash table. @@ -60,8 +93,28 @@ int hashtab_insert(struct hashtab *h, void *k, void *d, * Returns NULL if no entry has the specified key or * the datum of the entry otherwise. */ -void *hashtab_search(struct hashtab *h, const void *k, - struct hashtab_key_params key_params); +static inline void *hashtab_search(struct hashtab *h, const void *key, + struct hashtab_key_params key_params) +{ + u32 hvalue; + struct hashtab_node *cur; + + if (!h->size) + return NULL; + + hvalue = key_params.hash(key) & (h->size - 1); + cur = h->htable[hvalue]; + while (cur) { + int cmp = key_params.cmp(key, cur->key); + + if (cmp == 0) + return cur->datum; + if (cmp < 0) + break; + cur = cur->next; + } + return NULL; +} /* * Destroys the specified hash table. |