diff options
| -rw-r--r-- | fs/mbcache.c | 117 | ||||
| -rw-r--r-- | include/linux/mbcache.h | 12 |
2 files changed, 85 insertions, 44 deletions
diff --git a/fs/mbcache.c b/fs/mbcache.c index e519e45bf673..55db0daaca74 100644 --- a/fs/mbcache.c +++ b/fs/mbcache.c @@ -34,9 +34,9 @@ #include <linux/mm.h> #include <linux/slab.h> #include <linux/sched.h> -#include <linux/init.h> +#include <linux/list_bl.h> #include <linux/mbcache.h> - +#include <linux/init.h> #ifdef MB_CACHE_DEBUG # define mb_debug(f...) do { \ @@ -87,21 +87,38 @@ static LIST_HEAD(mb_cache_lru_list); static DEFINE_SPINLOCK(mb_cache_spinlock); static inline int -__mb_cache_entry_is_hashed(struct mb_cache_entry *ce) +__mb_cache_entry_is_block_hashed(struct mb_cache_entry *ce) { - return !list_empty(&ce->e_block_list); + return !hlist_bl_unhashed(&ce->e_block_list); } -static void -__mb_cache_entry_unhash(struct mb_cache_entry *ce) +static inline void +__mb_cache_entry_unhash_block(struct mb_cache_entry *ce) { - if (__mb_cache_entry_is_hashed(ce)) { - list_del_init(&ce->e_block_list); - list_del(&ce->e_index.o_list); - } + if (__mb_cache_entry_is_block_hashed(ce)) + hlist_bl_del_init(&ce->e_block_list); +} + +static inline int +__mb_cache_entry_is_index_hashed(struct mb_cache_entry *ce) +{ + return !hlist_bl_unhashed(&ce->e_index.o_list); } +static inline void +__mb_cache_entry_unhash_index(struct mb_cache_entry *ce) +{ + if (__mb_cache_entry_is_index_hashed(ce)) + hlist_bl_del_init(&ce->e_index.o_list); +} + +static inline void +__mb_cache_entry_unhash(struct mb_cache_entry *ce) +{ + __mb_cache_entry_unhash_index(ce); + __mb_cache_entry_unhash_block(ce); +} static void __mb_cache_entry_forget(struct mb_cache_entry *ce, gfp_t gfp_mask) @@ -125,7 +142,7 @@ __mb_cache_entry_release_unlock(struct mb_cache_entry *ce) ce->e_used -= MB_CACHE_WRITER; ce->e_used--; if (!(ce->e_used || ce->e_queued)) { - if (!__mb_cache_entry_is_hashed(ce)) + if (!__mb_cache_entry_is_block_hashed(ce)) goto forget; mb_assert(list_empty(&ce->e_lru_list)); list_add_tail(&ce->e_lru_list, &mb_cache_lru_list); @@ -221,18 +238,18 @@ mb_cache_create(const char *name, int bucket_bits) cache->c_name = name; atomic_set(&cache->c_entry_count, 0); cache->c_bucket_bits = bucket_bits; - cache->c_block_hash = kmalloc(bucket_count * sizeof(struct list_head), - GFP_KERNEL); + cache->c_block_hash = kmalloc(bucket_count * + sizeof(struct hlist_bl_head), GFP_KERNEL); if (!cache->c_block_hash) goto fail; for (n=0; n<bucket_count; n++) - INIT_LIST_HEAD(&cache->c_block_hash[n]); - cache->c_index_hash = kmalloc(bucket_count * sizeof(struct list_head), - GFP_KERNEL); + INIT_HLIST_BL_HEAD(&cache->c_block_hash[n]); + cache->c_index_hash = kmalloc(bucket_count * + sizeof(struct hlist_bl_head), GFP_KERNEL); if (!cache->c_index_hash) goto fail; for (n=0; n<bucket_count; n++) - INIT_LIST_HEAD(&cache->c_index_hash[n]); + INIT_HLIST_BL_HEAD(&cache->c_index_hash[n]); cache->c_entry_cache = kmem_cache_create(name, sizeof(struct mb_cache_entry), 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL); @@ -364,10 +381,13 @@ mb_cache_entry_alloc(struct mb_cache *cache, gfp_t gfp_flags) return NULL; atomic_inc(&cache->c_entry_count); INIT_LIST_HEAD(&ce->e_lru_list); - INIT_LIST_HEAD(&ce->e_block_list); + INIT_HLIST_BL_NODE(&ce->e_block_list); + INIT_HLIST_BL_NODE(&ce->e_index.o_list); ce->e_cache = cache; ce->e_queued = 0; } + ce->e_block_hash_p = &cache->c_block_hash[0]; + ce->e_index_hash_p = &cache->c_index_hash[0]; ce->e_used = 1 + MB_CACHE_WRITER; return ce; } @@ -393,25 +413,32 @@ mb_cache_entry_insert(struct mb_cache_entry *ce, struct block_device *bdev, { struct mb_cache *cache = ce->e_cache; unsigned int bucket; - struct list_head *l; + struct hlist_bl_node *l; int error = -EBUSY; + struct hlist_bl_head *block_hash_p; + struct hlist_bl_head *index_hash_p; + struct mb_cache_entry *lce; + mb_assert(ce); bucket = hash_long((unsigned long)bdev + (block & 0xffffffff), cache->c_bucket_bits); + block_hash_p = &cache->c_block_hash[bucket]; spin_lock(&mb_cache_spinlock); - list_for_each_prev(l, &cache->c_block_hash[bucket]) { - struct mb_cache_entry *ce = - list_entry(l, struct mb_cache_entry, e_block_list); - if (ce->e_bdev == bdev && ce->e_block == block) + hlist_bl_for_each_entry(lce, l, block_hash_p, e_block_list) { + if (lce->e_bdev == bdev && lce->e_block == block) goto out; } + mb_assert(!__mb_cache_entry_is_block_hashed(ce)); __mb_cache_entry_unhash(ce); ce->e_bdev = bdev; ce->e_block = block; - list_add(&ce->e_block_list, &cache->c_block_hash[bucket]); + ce->e_block_hash_p = block_hash_p; ce->e_index.o_key = key; bucket = hash_long(key, cache->c_bucket_bits); - list_add(&ce->e_index.o_list, &cache->c_index_hash[bucket]); + index_hash_p = &cache->c_index_hash[bucket]; + ce->e_index_hash_p = index_hash_p; + hlist_bl_add_head(&ce->e_index.o_list, index_hash_p); + hlist_bl_add_head(&ce->e_block_list, block_hash_p); error = 0; out: spin_unlock(&mb_cache_spinlock); @@ -463,14 +490,16 @@ mb_cache_entry_get(struct mb_cache *cache, struct block_device *bdev, sector_t block) { unsigned int bucket; - struct list_head *l; + struct hlist_bl_node *l; struct mb_cache_entry *ce; + struct hlist_bl_head *block_hash_p; bucket = hash_long((unsigned long)bdev + (block & 0xffffffff), cache->c_bucket_bits); + block_hash_p = &cache->c_block_hash[bucket]; spin_lock(&mb_cache_spinlock); - list_for_each(l, &cache->c_block_hash[bucket]) { - ce = list_entry(l, struct mb_cache_entry, e_block_list); + hlist_bl_for_each_entry(ce, l, block_hash_p, e_block_list) { + mb_assert(ce->e_block_hash_p == block_hash_p); if (ce->e_bdev == bdev && ce->e_block == block) { DEFINE_WAIT(wait); @@ -489,7 +518,7 @@ mb_cache_entry_get(struct mb_cache *cache, struct block_device *bdev, finish_wait(&mb_cache_queue, &wait); ce->e_used += 1 + MB_CACHE_WRITER; - if (!__mb_cache_entry_is_hashed(ce)) { + if (!__mb_cache_entry_is_block_hashed(ce)) { __mb_cache_entry_release_unlock(ce); return NULL; } @@ -506,12 +535,14 @@ cleanup: #if !defined(MB_CACHE_INDEXES_COUNT) || (MB_CACHE_INDEXES_COUNT > 0) static struct mb_cache_entry * -__mb_cache_entry_find(struct list_head *l, struct list_head *head, +__mb_cache_entry_find(struct hlist_bl_node *l, struct hlist_bl_head *head, struct block_device *bdev, unsigned int key) { - while (l != head) { + while (l != NULL) { struct mb_cache_entry *ce = - list_entry(l, struct mb_cache_entry, e_index.o_list); + hlist_bl_entry(l, struct mb_cache_entry, + e_index.o_list); + mb_assert(ce->e_index_hash_p == head); if (ce->e_bdev == bdev && ce->e_index.o_key == key) { DEFINE_WAIT(wait); @@ -532,7 +563,7 @@ __mb_cache_entry_find(struct list_head *l, struct list_head *head, } finish_wait(&mb_cache_queue, &wait); - if (!__mb_cache_entry_is_hashed(ce)) { + if (!__mb_cache_entry_is_block_hashed(ce)) { __mb_cache_entry_release_unlock(ce); spin_lock(&mb_cache_spinlock); return ERR_PTR(-EAGAIN); @@ -562,12 +593,16 @@ mb_cache_entry_find_first(struct mb_cache *cache, struct block_device *bdev, unsigned int key) { unsigned int bucket = hash_long(key, cache->c_bucket_bits); - struct list_head *l; - struct mb_cache_entry *ce; + struct hlist_bl_node *l; + struct mb_cache_entry *ce = NULL; + struct hlist_bl_head *index_hash_p; + index_hash_p = &cache->c_index_hash[bucket]; spin_lock(&mb_cache_spinlock); - l = cache->c_index_hash[bucket].next; - ce = __mb_cache_entry_find(l, &cache->c_index_hash[bucket], bdev, key); + if (!hlist_bl_empty(index_hash_p)) { + l = hlist_bl_first(index_hash_p); + ce = __mb_cache_entry_find(l, index_hash_p, bdev, key); + } spin_unlock(&mb_cache_spinlock); return ce; } @@ -597,12 +632,16 @@ mb_cache_entry_find_next(struct mb_cache_entry *prev, { struct mb_cache *cache = prev->e_cache; unsigned int bucket = hash_long(key, cache->c_bucket_bits); - struct list_head *l; + struct hlist_bl_node *l; struct mb_cache_entry *ce; + struct hlist_bl_head *index_hash_p; + index_hash_p = &cache->c_index_hash[bucket]; + mb_assert(prev->e_index_hash_p == index_hash_p); spin_lock(&mb_cache_spinlock); + mb_assert(!hlist_bl_empty(index_hash_p)); l = prev->e_index.o_list.next; - ce = __mb_cache_entry_find(l, &cache->c_index_hash[bucket], bdev, key); + ce = __mb_cache_entry_find(l, index_hash_p, bdev, key); __mb_cache_entry_release_unlock(prev); return ce; } diff --git a/include/linux/mbcache.h b/include/linux/mbcache.h index 5525d370701d..6a392e7a723a 100644 --- a/include/linux/mbcache.h +++ b/include/linux/mbcache.h @@ -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 */ |