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mbcache: Remove unused features

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The mbcache code was written to support a variable number of indexes,
but all the existing users use exactly one index.  Simplify to code to
support only that case.

There are also no users of the cache entry free operation, and none of
the users keep extra data in cache entries.  Remove those features as
well.

Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher 2010-07-19 18:19:41 +02:00 • committed by Al Viro
parent 365b181897
commit 2aec7c5232
5 changed files with 60 additions and 137 deletions
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20
include/linux/mbcache.h
View file

@ -4,9 +4,6 @@
(C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/
/* Hardwire the number of additional indexes */
#define MB_CACHE_INDEXES_COUNT 1
struct mb_cache_entry {
struct list_head e_lru_list;
struct mb_cache *e_cache;
@ -18,17 +15,12 @@ struct mb_cache_entry {
struct {
struct list_head o_list;
unsigned int o_key;
} e_indexes[0];
};
struct mb_cache_op {
int (*free)(struct mb_cache_entry *, gfp_t);
} e_index;
};
/* Functions on caches */
struct mb_cache * mb_cache_create(const char *, struct mb_cache_op *, size_t,
int, int);
struct mb_cache *mb_cache_create(const char *, int);
void mb_cache_shrink(struct block_device *);
void mb_cache_destroy(struct mb_cache *);
@ -36,17 +28,15 @@ void mb_cache_destroy(struct mb_cache *);
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[]);
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);
#if !defined(MB_CACHE_INDEXES_COUNT) || (MB_CACHE_INDEXES_COUNT > 0)
struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache, int,
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 *, int,
struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *,
struct block_device *,
unsigned int);
#endif