diff options
| author | Gui Jianfeng <guijianfeng@cn.fujitsu.com> | 2010-02-26 08:56:15 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2010-02-26 08:56:15 +0100 |
| commit | 024f9066165ffe9c8284431c78adcbcddd309831 (patch) | |
| tree | 11b64dd7861985aca57bd7624cd25c804afd4b1a /block | |
| parent | 7f03292ee16e68be96aa88904afc6152f8d37736 (diff) | |
| download | linux-024f9066165ffe9c8284431c78adcbcddd309831.tar.gz linux-024f9066165ffe9c8284431c78adcbcddd309831.tar.bz2 linux-024f9066165ffe9c8284431c78adcbcddd309831.zip | |
cfq: Remove useless css reference get
There's no need to take css reference here, for the caller
has already called rcu_read_lock() to prevent cgroup from
being removed.
Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-cgroup.c | 14 | ||||
| -rw-r--r-- | block/blk-cgroup.h | 3 | ||||
| -rw-r--r-- | block/cfq-iosched.c | 5 |
3 files changed, 0 insertions, 22 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index e7dbbaf5fb3e..c85d74cae200 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -23,20 +23,6 @@ static LIST_HEAD(blkio_list); struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT }; EXPORT_SYMBOL_GPL(blkio_root_cgroup); -bool blkiocg_css_tryget(struct blkio_cgroup *blkcg) -{ - if (!css_tryget(&blkcg->css)) - return false; - return true; -} -EXPORT_SYMBOL_GPL(blkiocg_css_tryget); - -void blkiocg_css_put(struct blkio_cgroup *blkcg) -{ - css_put(&blkcg->css); -} -EXPORT_SYMBOL_GPL(blkiocg_css_put); - struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id), diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index 4d316df863b4..84bf745fa775 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -43,9 +43,6 @@ struct blkio_group { unsigned long sectors; }; -extern bool blkiocg_css_tryget(struct blkio_cgroup *blkcg); -extern void blkiocg_css_put(struct blkio_cgroup *blkcg); - typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg); typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg, unsigned int weight); diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index e3dedfd3bcb4..10eb286f1f49 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -951,10 +951,6 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create) struct backing_dev_info *bdi = &cfqd->queue->backing_dev_info; unsigned int major, minor; - /* Do we need to take this reference */ - if (!blkiocg_css_tryget(blkcg)) - return NULL;; - cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key)); if (cfqg || !create) goto done; @@ -985,7 +981,6 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create) hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list); done: - blkiocg_css_put(blkcg); return cfqg; } |