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authorDan Streetman <ddstreet@ieee.org>2015-06-25 15:00:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-25 17:00:37 -0700
commit479305fd7172503772575997eb6f1b0a2bb4a107 (patch)
tree134e5910aa691a12002a95b47c5ea2ee2b148123 /mm/zpool.c
parentcf41f5f496d68f2ced1fc77871c63d1c526fa100 (diff)
zpool: remove zpool_evict()
Remove zpool_evict() helper function. As zbud is currently the only zpool implementation that supports eviction, add zpool and zpool_ops references to struct zbud_pool and directly call zpool_ops->evict(zpool, handle) on eviction. Currently zpool provides the zpool_evict helper which locks the zpool list lock and searches through all pools to find the specific one matching the caller, and call the corresponding zpool_ops->evict function. However, this is unnecessary, as the zbud pool can simply keep a reference to the zpool that created it, as well as the zpool_ops, and directly call the zpool_ops->evict function, when it needs to evict a page. This avoids a spinlock and list search in zpool for each eviction. Signed-off-by: Dan Streetman <ddstreet@ieee.org> Cc: Seth Jennings <sjennings@variantweb.net> Cc: Minchan Kim <minchan@kernel.org> Cc: Nitin Gupta <ngupta@vflare.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/zpool.c')
-rw-r--r--mm/zpool.c29
1 files changed, 1 insertions, 28 deletions
diff --git a/mm/zpool.c b/mm/zpool.c
index 6b1f1035cd99..722a4f60e90b 100644
--- a/mm/zpool.c
+++ b/mm/zpool.c
@@ -73,33 +73,6 @@ int zpool_unregister_driver(struct zpool_driver *driver)
}
EXPORT_SYMBOL(zpool_unregister_driver);
-/**
- * zpool_evict() - evict callback from a zpool implementation.
- * @pool: pool to evict from.
- * @handle: handle to evict.
- *
- * This can be used by zpool implementations to call the
- * user's evict zpool_ops struct evict callback.
- */
-int zpool_evict(void *pool, unsigned long handle)
-{
- struct zpool *zpool;
-
- spin_lock(&pools_lock);
- list_for_each_entry(zpool, &pools_head, list) {
- if (zpool->pool == pool) {
- spin_unlock(&pools_lock);
- if (!zpool->ops || !zpool->ops->evict)
- return -EINVAL;
- return zpool->ops->evict(zpool, handle);
- }
- }
- spin_unlock(&pools_lock);
-
- return -ENOENT;
-}
-EXPORT_SYMBOL(zpool_evict);
-
static struct zpool_driver *zpool_get_driver(char *type)
{
struct zpool_driver *driver;
@@ -170,7 +143,7 @@ struct zpool *zpool_create_pool(char *type, char *name, gfp_t gfp,
zpool->type = driver->type;
zpool->driver = driver;
- zpool->pool = driver->create(name, gfp, ops);
+ zpool->pool = driver->create(name, gfp, ops, zpool);
zpool->ops = ops;
if (!zpool->pool) {