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linux-next/include/linux/mbcache.h
T Makphaibulchoke 3e037e5211 fs/mbcache.c: change block and index hash chain to hlist_bl_node
This patch changes each mb_cache's both block and index hash chains to
use a hlist_bl_node, which contains a built-in lock.  This is the
first step in decoupling of locks serializing accesses to mb_cache
global data and each mb_cache_entry local data.

Signed-off-by: T. Makphaibulchoke <tmac@hp.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2014-03-18 19:19:41 -04:00

56 lines
1.6 KiB
C

/*
File: linux/mbcache.h
(C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/
struct mb_cache_entry {
struct list_head e_lru_list;
struct mb_cache *e_cache;
unsigned short e_used;
unsigned short e_queued;
atomic_t e_refcnt;
struct block_device *e_bdev;
sector_t e_block;
struct hlist_bl_node e_block_list;
struct {
struct hlist_bl_node o_list;
unsigned int o_key;
} e_index;
struct hlist_bl_head *e_block_hash_p;
struct hlist_bl_head *e_index_hash_p;
};
struct mb_cache {
struct list_head c_cache_list;
const char *c_name;
atomic_t c_entry_count;
int c_max_entries;
int c_bucket_bits;
struct kmem_cache *c_entry_cache;
struct hlist_bl_head *c_block_hash;
struct hlist_bl_head *c_index_hash;
};
/* Functions on caches */
struct mb_cache *mb_cache_create(const char *, int);
void mb_cache_shrink(struct block_device *);
void mb_cache_destroy(struct mb_cache *);
/* Functions on cache entries */
struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *, gfp_t);
int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *,
sector_t, unsigned int);
void mb_cache_entry_release(struct mb_cache_entry *);
void mb_cache_entry_free(struct mb_cache_entry *);
struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *,
struct block_device *,
sector_t);
struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
struct block_device *,
unsigned int);
struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *,
struct block_device *,
unsigned int);