forked from luck/tmp_suning_uos_patched
3e037e5211
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>
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/*
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File: linux/mbcache.h
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(C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
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*/
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struct mb_cache_entry {
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struct list_head e_lru_list;
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struct mb_cache *e_cache;
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unsigned short e_used;
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unsigned short e_queued;
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atomic_t e_refcnt;
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struct block_device *e_bdev;
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sector_t e_block;
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struct hlist_bl_node e_block_list;
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struct {
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struct hlist_bl_node o_list;
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unsigned int o_key;
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} e_index;
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struct hlist_bl_head *e_block_hash_p;
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struct hlist_bl_head *e_index_hash_p;
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};
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struct mb_cache {
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struct list_head c_cache_list;
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const char *c_name;
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atomic_t c_entry_count;
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int c_max_entries;
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int c_bucket_bits;
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struct kmem_cache *c_entry_cache;
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struct hlist_bl_head *c_block_hash;
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struct hlist_bl_head *c_index_hash;
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};
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/* Functions on caches */
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struct mb_cache *mb_cache_create(const char *, int);
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void mb_cache_shrink(struct block_device *);
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void mb_cache_destroy(struct mb_cache *);
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/* Functions on cache entries */
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struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *, gfp_t);
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int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *,
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sector_t, unsigned int);
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void mb_cache_entry_release(struct mb_cache_entry *);
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void mb_cache_entry_free(struct mb_cache_entry *);
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struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *,
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struct block_device *,
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sector_t);
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struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
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struct block_device *,
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unsigned int);
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struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *,
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struct block_device *,
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unsigned int);
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