diff options
author | Tejun Heo <tj@kernel.org> | 2012-03-05 13:15:03 -0800 |
---|---|---|
committer | Jens Axboe <axboe@kernel.dk> | 2012-03-06 21:27:22 +0100 |
commit | ca32aefc7f2539ed88d42763330d54ee3e61769a (patch) | |
tree | 791d2ac1c11b738ce34629653090b6e971fc11b5 /block/cfq-iosched.c | |
parent | 0a5a7d0e32be6643b881f0e7cd9d0d06fadde27a (diff) | |
download | linux-ca32aefc7f2539ed88d42763330d54ee3e61769a.tar.bz2 |
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.c | 30 |
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++; |