Messages in this thread Patch in this message | | | Subject | [PATCH 1/4] blkio_group key change: void * -> request_queue * | From | Chad Talbott <> | Date | Thu, 25 Mar 2010 11:04:23 -0700 |
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Use request_queue to find the blkio_group of a device, rather than a cfq_data pointer. Additionally, it allows the blk-cgroup code to depend on the queue pointer itself. This avoids doing lookups for dev_t and facilitates looking up the device's human-readable name in later patches. --- block/blk-cgroup.c | 17 ++++++++--------- block/blk-cgroup.h | 13 +++++++------ block/cfq-iosched.c | 22 ++++++++++------------ 3 files changed, 25 insertions(+), 27 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 4b686ad..917957d 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -15,6 +15,7 @@ #include <linux/kdev_t.h> #include <linux/module.h> #include <linux/err.h> +#include <linux/genhd.h> #include "blk-cgroup.h" static DEFINE_SPINLOCK(blkio_list_lock); @@ -64,12 +65,12 @@ void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, EXPORT_SYMBOL_GPL(blkiocg_update_blkio_group_stats); void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, - struct blkio_group *blkg, void *key, dev_t dev) + struct blkio_group *blkg, struct request_queue *queue, dev_t dev) { unsigned long flags; spin_lock_irqsave(&blkcg->lock, flags); - rcu_assign_pointer(blkg->key, key); + rcu_assign_pointer(blkg->queue, queue); blkg->blkcg_id = css_id(&blkcg->css); hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list); spin_unlock_irqrestore(&blkcg->lock, flags); @@ -117,15 +118,15 @@ out: EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group); /* called under rcu_read_lock(). */ -struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) +struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, struct request_queue *queue) { struct blkio_group *blkg; struct hlist_node *n; - void *__key; + struct request_queue *__queue; hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { - __key = blkg->key; - if (__key == key) + __queue = blkg->queue; + if (__queue == queue) return blkg; } @@ -243,7 +244,6 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); unsigned long flags; struct blkio_group *blkg; - void *key; struct blkio_policy_type *blkiop; rcu_read_lock(); @@ -257,7 +257,6 @@ remove_entry: blkg = hlist_entry(blkcg->blkg_list.first, struct blkio_group, blkcg_node); - key = rcu_dereference(blkg->key); __blkiocg_del_blkio_group(blkg); spin_unlock_irqrestore(&blkcg->lock, flags); @@ -272,7 +271,7 @@ remove_entry: */ spin_lock(&blkio_list_lock); list_for_each_entry(blkiop, &blkio_list, list) - blkiop->ops.blkio_unlink_group_fn(key, blkg); + blkiop->ops.blkio_unlink_group_fn(blkg); spin_unlock(&blkio_list_lock); goto remove_entry; done: diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index 8ccc204..9e70c03 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -14,6 +14,7 @@ */ #include <linux/cgroup.h> +#include <linux/blkdev.h> #if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE) @@ -32,7 +33,7 @@ struct blkio_cgroup { struct blkio_group { /* An rcu protected unique identifier for the group */ - void *key; + struct request_queue *queue; struct hlist_node blkcg_node; unsigned short blkcg_id; #ifdef CONFIG_DEBUG_BLK_CGROUP @@ -49,7 +50,7 @@ struct blkio_group { unsigned long sectors; }; -typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg); +typedef void (blkio_unlink_group_fn) (struct blkio_group *blkg); typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg, unsigned int weight); @@ -101,10 +102,10 @@ static inline void blkiocg_update_blkio_group_dequeue_stats( extern struct blkio_cgroup blkio_root_cgroup; extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, - struct blkio_group *blkg, void *key, dev_t dev); + struct blkio_group *blkg, struct request_queue *queue, dev_t dev); extern int blkiocg_del_blkio_group(struct blkio_group *blkg); extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, - void *key); + struct request_queue *queue); void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, unsigned long time, unsigned long sectors); #else @@ -113,7 +114,7 @@ static inline struct blkio_cgroup * cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, - struct blkio_group *blkg, void *key, dev_t dev) + struct blkio_group *blkg, struct request_queue *queue, dev_t dev) { } @@ -121,7 +122,7 @@ static inline int blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; } static inline struct blkio_group * -blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; } +blkiocg_lookup_group(struct blkio_cgroup *blkcg, struct request_queue *queue) { return NULL; } static inline void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, unsigned long time, unsigned long sectors) { diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index dee9d93..864b39a 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -940,13 +940,13 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create) { struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); struct cfq_group *cfqg = NULL; - void *key = cfqd; + struct request_queue *queue = cfqd->queue; int i, j; struct cfq_rb_root *st; struct backing_dev_info *bdi = &cfqd->queue->backing_dev_info; unsigned int major, minor; - cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key)); + cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, queue)); if (cfqg || !create) goto done; @@ -969,7 +969,7 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create) /* Add group onto cgroup list */ sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor); - blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd, + blkiocg_add_blkio_group(blkcg, &cfqg->blkg, cfqd->queue, MKDEV(major, minor)); /* Add group on cfqd list */ @@ -1021,7 +1021,7 @@ static void cfq_put_cfqg(struct cfq_group *cfqg) kfree(cfqg); } -static void cfq_destroy_cfqg(struct cfq_data *cfqd, struct cfq_group *cfqg) +static void cfq_destroy_cfqg(struct cfq_group *cfqg) { /* Something wrong if we are trying to remove same group twice */ BUG_ON(hlist_unhashed(&cfqg->cfqd_node)); @@ -1047,7 +1047,7 @@ static void cfq_release_cfq_groups(struct cfq_data *cfqd) * cfqg also. */ if (!blkiocg_del_blkio_group(&cfqg->blkg)) - cfq_destroy_cfqg(cfqd, cfqg); + cfq_destroy_cfqg(cfqg); } } @@ -1065,14 +1065,13 @@ static void cfq_release_cfq_groups(struct cfq_data *cfqd) * it should not be NULL as even if elevator was exiting, cgroup deltion * path got to it first. */ -void cfq_unlink_blkio_group(void *key, struct blkio_group *blkg) +void cfq_unlink_blkio_group(struct blkio_group *blkg) { unsigned long flags; - struct cfq_data *cfqd = key; - spin_lock_irqsave(cfqd->queue->queue_lock, flags); - cfq_destroy_cfqg(cfqd, cfqg_of_blkg(blkg)); - spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); + spin_lock_irqsave(blkg->queue->queue_lock, flags); + cfq_destroy_cfqg(cfqg_of_blkg(blkg)); + spin_unlock_irqrestore(blkg->queue->queue_lock, flags); } #else /* GROUP_IOSCHED */ @@ -3672,8 +3671,7 @@ static void *cfq_init_queue(struct request_queue *q) * to make sure that cfq_put_cfqg() does not try to kfree root group */ atomic_set(&cfqg->ref, 1); - blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg, (void *)cfqd, - 0); + blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg, q, 0); #endif /* * Not strictly needed (since RB_ROOT just clears the node and we
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