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ext4: each filesystem creates and uses its own mb_cache

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This patch adds new interfaces to create and destory cache,
ext4_xattr_create_cache() and ext4_xattr_destroy_cache(), and remove
the cache creation and destory calls from ex4_init_xattr() and
ext4_exitxattr() in fs/ext4/xattr.c.

fs/ext4/super.c has been changed so that when a filesystem is mounted
a cache is allocated and attched to its ext4_sb_info structure.

fs/mbcache.c has been changed so that only one slab allocator is
allocated and used by all mbcache structures.

Signed-off-by: T. Makphaibulchoke <tmac@hp.com>
This commit is contained in:
T Makphaibulchoke
2014-03-18 19:24:49 -04:00
committed by Theodore Ts'o
parent 1f3e55fe02
commit 9c191f701c
5 changed files with 62 additions and 39 deletions
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18
fs/mbcache.c
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@@ -99,6 +99,7 @@
static DECLARE_WAIT_QUEUE_HEAD(mb_cache_queue);
static struct blockgroup_lock *mb_cache_bg_lock;
static struct kmem_cache *mb_cache_kmem_cache;
MODULE_AUTHOR("Andreas Gruenbacher <a.gruenbacher@computer.org>");
MODULE_DESCRIPTION("Meta block cache (for extended attributes)");
@@ -351,11 +352,14 @@ mb_cache_create(const char *name, int bucket_bits)
goto fail;
for (n=0; n<bucket_count; 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);
if (!cache->c_entry_cache)
goto fail2;
if (!mb_cache_kmem_cache) {
mb_cache_kmem_cache = kmem_cache_create(name,
sizeof(struct mb_cache_entry), 0,
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
if (!mb_cache_kmem_cache)
goto fail2;
}
cache->c_entry_cache = mb_cache_kmem_cache;
/*
* Set an upper limit on the number of cache entries so that the hash
@@ -476,6 +480,10 @@ mb_cache_destroy(struct mb_cache *cache)
atomic_read(&cache->c_entry_count));
}
if (list_empty(&mb_cache_list)) {
kmem_cache_destroy(mb_cache_kmem_cache);
mb_cache_kmem_cache = NULL;
}
kfree(cache->c_index_hash);
kfree(cache->c_block_hash);
kfree(cache);