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authorT Makphaibulchoke <tmac@hp.com>2014-03-18 19:24:49 -0400
committerTheodore Ts'o <tytso@mit.edu>2014-03-18 19:24:49 -0400
commit9c191f701ce9f9bc604e88a5dc69cd943daa5d3b (patch)
tree2e7a0ffa25f89e6dab1719deeb6a710405517afc /fs/mbcache.c
parent1f3e55fe02d12213f87869768aa2b0bad3ba9a7d (diff)
downloadlinux-stericsson-9c191f701ce9f9bc604e88a5dc69cd943daa5d3b.tar.gz
ext4: each filesystem creates and uses its own mb_cache
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>
Diffstat (limited to 'fs/mbcache.c')
-rw-r--r--fs/mbcache.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/fs/mbcache.c b/fs/mbcache.c
index 786ecab81c99..bf166e388f0d 100644
--- a/fs/mbcache.c
+++ b/fs/mbcache.c
@@ -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);