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fs/mbcache.c: change block and index hash chain to hlist_bl_node

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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>
This commit is contained in:
T Makphaibulchoke 2014-03-18 19:19:41 -04:00 • committed by Theodore Ts'o
parent b8a8684502
commit 3e037e5211
2 changed files with 85 additions and 44 deletions
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12
include/linux/mbcache.h
View file

@ -3,19 +3,21 @@
(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 list_head e_block_list;
struct hlist_bl_node e_block_list;
struct {
struct list_head o_list;
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 {
@ -25,8 +27,8 @@ struct mb_cache {
int c_max_entries;
int c_bucket_bits;
struct kmem_cache *c_entry_cache;
struct list_head *c_block_hash;
struct list_head *c_index_hash;
struct hlist_bl_head *c_block_hash;
struct hlist_bl_head *c_index_hash;
};
/* Functions on caches */