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authorTejun Heo <tj@kernel.org>2012-03-06 01:15:03 +0400
committerJens Axboe <axboe@kernel.dk>2012-03-07 00:27:22 +0400
commitca32aefc7f2539ed88d42763330d54ee3e61769a (patch)
tree791d2ac1c11b738ce34629653090b6e971fc11b5 /block/cfq-iosched.c
parent0a5a7d0e32be6643b881f0e7cd9d0d06fadde27a (diff)
downloadlinux-ca32aefc7f2539ed88d42763330d54ee3e61769a.tar.xz
blkcg: use q and plid instead of opaque void * for blkio_group association
blkgio_group is association between a block cgroup and a queue for a given policy. Using opaque void * for association makes things confusing and hinders factoring of common code. Use request_queue * and, if necessary, policy id instead. This will help block cgroup API cleanup. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/cfq-iosched.c')
-rw-r--r--block/cfq-iosched.c30
1 files changed, 16 insertions, 14 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 0f7a81fc7c73..37e2da9cbb09 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1020,7 +1020,8 @@ static inline struct cfq_group *cfqg_of_blkg(struct blkio_group *blkg)
return NULL;
}
-static void cfq_update_blkio_group_weight(void *key, struct blkio_group *blkg,
+static void cfq_update_blkio_group_weight(struct request_queue *q,
+ struct blkio_group *blkg,
unsigned int weight)
{
struct cfq_group *cfqg = cfqg_of_blkg(blkg);
@@ -1043,10 +1044,10 @@ static void cfq_init_add_cfqg_lists(struct cfq_data *cfqd,
if (bdi->dev) {
sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);
cfq_blkiocg_add_blkio_group(blkcg, &cfqg->blkg,
- (void *)cfqd, MKDEV(major, minor));
+ cfqd->queue, MKDEV(major, minor));
} else
cfq_blkiocg_add_blkio_group(blkcg, &cfqg->blkg,
- (void *)cfqd, 0);
+ cfqd->queue, 0);
cfqd->nr_blkcg_linked_grps++;
cfqg->weight = blkcg_get_weight(blkcg, cfqg->blkg.dev);
@@ -1097,7 +1098,6 @@ static struct cfq_group *
cfq_find_cfqg(struct cfq_data *cfqd, struct blkio_cgroup *blkcg)
{
struct cfq_group *cfqg = NULL;
- void *key = cfqd;
struct backing_dev_info *bdi = &cfqd->queue->backing_dev_info;
unsigned int major, minor;
@@ -1108,7 +1108,8 @@ cfq_find_cfqg(struct cfq_data *cfqd, struct blkio_cgroup *blkcg)
if (blkcg == &blkio_root_cgroup)
cfqg = &cfqd->root_group;
else
- cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key));
+ cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, cfqd->queue,
+ BLKIO_POLICY_PROP));
if (cfqg && !cfqg->blkg.dev && bdi->dev && dev_name(bdi->dev)) {
sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);
@@ -1247,21 +1248,22 @@ static bool cfq_release_cfq_groups(struct cfq_data *cfqd)
* any pending IO in the group is finished.
*
* This function is called under rcu_read_lock(). key is the rcu protected
- * pointer. That means "key" is a valid cfq_data pointer as long as we are rcu
- * read lock.
+ * pointer. That means @q is a valid request_queue pointer as long as we
+ * are rcu read lock.
*
- * "key" was fetched from blkio_group under blkio_cgroup->lock. That means
+ * @q was fetched from blkio_group under blkio_cgroup->lock. That means
* it should not be NULL as even if elevator was exiting, cgroup deltion
* path got to it first.
*/
-static void cfq_unlink_blkio_group(void *key, struct blkio_group *blkg)
+static void cfq_unlink_blkio_group(struct request_queue *q,
+ struct blkio_group *blkg)
{
- unsigned long flags;
- struct cfq_data *cfqd = key;
+ struct cfq_data *cfqd = q->elevator->elevator_data;
+ unsigned long flags;
- spin_lock_irqsave(cfqd->queue->queue_lock, flags);
+ spin_lock_irqsave(q->queue_lock, flags);
cfq_destroy_cfqg(cfqd, cfqg_of_blkg(blkg));
- spin_unlock_irqrestore(cfqd->queue->queue_lock, flags);
+ spin_unlock_irqrestore(q->queue_lock, flags);
}
static struct elevator_type iosched_cfq;
@@ -3718,7 +3720,7 @@ static int cfq_init_queue(struct request_queue *q)
rcu_read_lock();
cfq_blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg,
- (void *)cfqd, 0);
+ cfqd->queue, 0);
rcu_read_unlock();
cfqd->nr_blkcg_linked_grps++;