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-rw-r--r--block/blk-cgroup.c224
-rw-r--r--block/blk-cgroup.h15
-rw-r--r--block/blk-core.c3
-rw-r--r--block/blk-sysfs.c4
-rw-r--r--block/blk-throttle.c9
-rw-r--r--block/cfq-iosched.c5
-rw-r--r--block/elevator.c5
7 files changed, 154 insertions, 111 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 2ca9a15db0f7..cad5f15cf49b 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -461,16 +461,20 @@ EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats);
*/
static void blkg_free(struct blkio_group *blkg)
{
- struct blkg_policy_data *pd;
+ int i;
if (!blkg)
return;
- pd = blkg->pd[blkg->plid];
- if (pd) {
- free_percpu(pd->stats_cpu);
- kfree(pd);
+ for (i = 0; i < BLKIO_NR_POLICIES; i++) {
+ struct blkg_policy_data *pd = blkg->pd[i];
+
+ if (pd) {
+ free_percpu(pd->stats_cpu);
+ kfree(pd);
+ }
}
+
kfree(blkg);
}
@@ -478,19 +482,17 @@ static void blkg_free(struct blkio_group *blkg)
* blkg_alloc - allocate a blkg
* @blkcg: block cgroup the new blkg is associated with
* @q: request_queue the new blkg is associated with
- * @pol: policy the new blkg is associated with
*
- * Allocate a new blkg assocating @blkcg and @q for @pol.
+ * Allocate a new blkg assocating @blkcg and @q.
*
* FIXME: Should be called with queue locked but currently isn't due to
* percpu stat breakage.
*/
static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
- struct request_queue *q,
- struct blkio_policy_type *pol)
+ struct request_queue *q)
{
struct blkio_group *blkg;
- struct blkg_policy_data *pd;
+ int i;
/* alloc and init base part */
blkg = kzalloc_node(sizeof(*blkg), GFP_ATOMIC, q->node);
@@ -499,34 +501,45 @@ static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
spin_lock_init(&blkg->stats_lock);
rcu_assign_pointer(blkg->q, q);
- INIT_LIST_HEAD(&blkg->q_node[0]);
- INIT_LIST_HEAD(&blkg->q_node[1]);
+ INIT_LIST_HEAD(&blkg->q_node);
blkg->blkcg = blkcg;
- blkg->plid = pol->plid;
blkg->refcnt = 1;
cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path));
- /* alloc per-policy data and attach it to blkg */
- pd = kzalloc_node(sizeof(*pd) + pol->pdata_size, GFP_ATOMIC,
- q->node);
- if (!pd) {
- blkg_free(blkg);
- return NULL;
- }
+ for (i = 0; i < BLKIO_NR_POLICIES; i++) {
+ struct blkio_policy_type *pol = blkio_policy[i];
+ struct blkg_policy_data *pd;
- blkg->pd[pol->plid] = pd;
- pd->blkg = blkg;
+ if (!pol)
+ continue;
+
+ /* alloc per-policy data and attach it to blkg */
+ pd = kzalloc_node(sizeof(*pd) + pol->pdata_size, GFP_ATOMIC,
+ q->node);
+ if (!pd) {
+ blkg_free(blkg);
+ return NULL;
+ }
- /* broken, read comment in the callsite */
+ blkg->pd[i] = pd;
+ pd->blkg = blkg;
- pd->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu);
- if (!pd->stats_cpu) {
- blkg_free(blkg);
- return NULL;
+ /* broken, read comment in the callsite */
+ pd->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu);
+ if (!pd->stats_cpu) {
+ blkg_free(blkg);
+ return NULL;
+ }
}
/* invoke per-policy init */
- pol->ops.blkio_init_group_fn(blkg);
+ for (i = 0; i < BLKIO_NR_POLICIES; i++) {
+ struct blkio_policy_type *pol = blkio_policy[i];
+
+ if (pol)
+ pol->ops.blkio_init_group_fn(blkg);
+ }
+
return blkg;
}
@@ -536,7 +549,6 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
bool for_root)
__releases(q->queue_lock) __acquires(q->queue_lock)
{
- struct blkio_policy_type *pol = blkio_policy[plid];
struct blkio_group *blkg, *new_blkg;
WARN_ON_ONCE(!rcu_read_lock_held());
@@ -551,7 +563,7 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
if (unlikely(blk_queue_bypass(q)) && !for_root)
return ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY);
- blkg = blkg_lookup(blkcg, q, plid);
+ blkg = blkg_lookup(blkcg, q);
if (blkg)
return blkg;
@@ -571,7 +583,7 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
spin_unlock_irq(q->queue_lock);
rcu_read_unlock();
- new_blkg = blkg_alloc(blkcg, q, pol);
+ new_blkg = blkg_alloc(blkcg, q);
rcu_read_lock();
spin_lock_irq(q->queue_lock);
@@ -583,7 +595,7 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
}
/* did someone beat us to it? */
- blkg = blkg_lookup(blkcg, q, plid);
+ blkg = blkg_lookup(blkcg, q);
if (unlikely(blkg))
goto out;
@@ -598,8 +610,8 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
swap(blkg, new_blkg);
hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list);
- list_add(&blkg->q_node[plid], &q->blkg_list[plid]);
- q->nr_blkgs[plid]++;
+ list_add(&blkg->q_node, &q->blkg_list);
+ q->nr_blkgs++;
spin_unlock(&blkcg->lock);
out:
@@ -636,31 +648,30 @@ EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group);
/* called under rcu_read_lock(). */
struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
- struct request_queue *q,
- enum blkio_policy_id plid)
+ struct request_queue *q)
{
struct blkio_group *blkg;
struct hlist_node *n;
hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node)
- if (blkg->q == q && blkg->plid == plid)
+ if (blkg->q == q)
return blkg;
return NULL;
}
EXPORT_SYMBOL_GPL(blkg_lookup);
-static void blkg_destroy(struct blkio_group *blkg, enum blkio_policy_id plid)
+static void blkg_destroy(struct blkio_group *blkg)
{
struct request_queue *q = blkg->q;
lockdep_assert_held(q->queue_lock);
/* Something wrong if we are trying to remove same group twice */
- WARN_ON_ONCE(list_empty(&blkg->q_node[plid]));
- list_del_init(&blkg->q_node[plid]);
+ WARN_ON_ONCE(list_empty(&blkg->q_node));
+ list_del_init(&blkg->q_node);
- WARN_ON_ONCE(q->nr_blkgs[plid] <= 0);
- q->nr_blkgs[plid]--;
+ WARN_ON_ONCE(q->nr_blkgs <= 0);
+ q->nr_blkgs--;
/*
* Put the reference taken at the time of creation so that when all
@@ -669,8 +680,40 @@ static void blkg_destroy(struct blkio_group *blkg, enum blkio_policy_id plid)
blkg_put(blkg);
}
-void blkg_destroy_all(struct request_queue *q, enum blkio_policy_id plid,
- bool destroy_root)
+/*
+ * XXX: This updates blkg policy data in-place for root blkg, which is
+ * necessary across elevator switch and policy registration as root blkgs
+ * aren't shot down. This broken and racy implementation is temporary.
+ * Eventually, blkg shoot down will be replaced by proper in-place update.
+ */
+void update_root_blkg_pd(struct request_queue *q, enum blkio_policy_id plid)
+{
+ struct blkio_policy_type *pol = blkio_policy[plid];
+ struct blkio_group *blkg = blkg_lookup(&blkio_root_cgroup, q);
+ struct blkg_policy_data *pd;
+
+ if (!blkg)
+ return;
+
+ kfree(blkg->pd[plid]);
+ blkg->pd[plid] = NULL;
+
+ if (!pol)
+ return;
+
+ pd = kzalloc(sizeof(*pd) + pol->pdata_size, GFP_KERNEL);
+ WARN_ON_ONCE(!pd);
+
+ pd->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu);
+ WARN_ON_ONCE(!pd->stats_cpu);
+
+ blkg->pd[plid] = pd;
+ pd->blkg = blkg;
+ pol->ops.blkio_init_group_fn(blkg);
+}
+EXPORT_SYMBOL_GPL(update_root_blkg_pd);
+
+void blkg_destroy_all(struct request_queue *q, bool destroy_root)
{
struct blkio_group *blkg, *n;
@@ -679,8 +722,7 @@ void blkg_destroy_all(struct request_queue *q, enum blkio_policy_id plid,
spin_lock_irq(q->queue_lock);
- list_for_each_entry_safe(blkg, n, &q->blkg_list[plid],
- q_node[plid]) {
+ list_for_each_entry_safe(blkg, n, &q->blkg_list, q_node) {
/* skip root? */
if (!destroy_root && blkg->blkcg == &blkio_root_cgroup)
continue;
@@ -691,7 +733,7 @@ void blkg_destroy_all(struct request_queue *q, enum blkio_policy_id plid,
* take care of destroying cfqg also.
*/
if (!blkiocg_del_blkio_group(blkg))
- blkg_destroy(blkg, plid);
+ blkg_destroy(blkg);
else
done = false;
}
@@ -776,43 +818,49 @@ blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val)
#endif
blkcg = cgroup_to_blkio_cgroup(cgroup);
+ spin_lock(&blkio_list_lock);
spin_lock_irq(&blkcg->lock);
hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
- struct blkg_policy_data *pd = blkg->pd[blkg->plid];
+ struct blkio_policy_type *pol;
- spin_lock(&blkg->stats_lock);
- stats = &pd->stats;
+ list_for_each_entry(pol, &blkio_list, list) {
+ struct blkg_policy_data *pd = blkg->pd[pol->plid];
+
+ spin_lock(&blkg->stats_lock);
+ stats = &pd->stats;
#ifdef CONFIG_DEBUG_BLK_CGROUP
- idling = blkio_blkg_idling(stats);
- waiting = blkio_blkg_waiting(stats);
- empty = blkio_blkg_empty(stats);
+ idling = blkio_blkg_idling(stats);
+ waiting = blkio_blkg_waiting(stats);
+ empty = blkio_blkg_empty(stats);
#endif
- for (i = 0; i < BLKIO_STAT_TOTAL; i++)
- queued[i] = stats->stat_arr[BLKIO_STAT_QUEUED][i];
- memset(stats, 0, sizeof(struct blkio_group_stats));
- for (i = 0; i < BLKIO_STAT_TOTAL; i++)
- stats->stat_arr[BLKIO_STAT_QUEUED][i] = queued[i];
+ for (i = 0; i < BLKIO_STAT_TOTAL; i++)
+ queued[i] = stats->stat_arr[BLKIO_STAT_QUEUED][i];
+ memset(stats, 0, sizeof(struct blkio_group_stats));
+ for (i = 0; i < BLKIO_STAT_TOTAL; i++)
+ stats->stat_arr[BLKIO_STAT_QUEUED][i] = queued[i];
#ifdef CONFIG_DEBUG_BLK_CGROUP
- if (idling) {
- blkio_mark_blkg_idling(stats);
- stats->start_idle_time = now;
- }
- if (waiting) {
- blkio_mark_blkg_waiting(stats);
- stats->start_group_wait_time = now;
- }
- if (empty) {
- blkio_mark_blkg_empty(stats);
- stats->start_empty_time = now;
- }
+ if (idling) {
+ blkio_mark_blkg_idling(stats);
+ stats->start_idle_time = now;
+ }
+ if (waiting) {
+ blkio_mark_blkg_waiting(stats);
+ stats->start_group_wait_time = now;
+ }
+ if (empty) {
+ blkio_mark_blkg_empty(stats);
+ stats->start_empty_time = now;
+ }
#endif
- spin_unlock(&blkg->stats_lock);
+ spin_unlock(&blkg->stats_lock);
- /* Reset Per cpu stats which don't take blkg->stats_lock */
- blkio_reset_stats_cpu(blkg, blkg->plid);
+ /* Reset Per cpu stats which don't take blkg->stats_lock */
+ blkio_reset_stats_cpu(blkg, pol->plid);
+ }
}
spin_unlock_irq(&blkcg->lock);
+ spin_unlock(&blkio_list_lock);
return 0;
}
@@ -1168,8 +1216,7 @@ static void blkio_read_conf(struct cftype *cft, struct blkio_cgroup *blkcg,
spin_lock_irq(&blkcg->lock);
hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node)
- if (BLKIOFILE_POLICY(cft->private) == blkg->plid)
- blkio_print_group_conf(cft, blkg, m);
+ blkio_print_group_conf(cft, blkg, m);
spin_unlock_irq(&blkcg->lock);
}
@@ -1224,7 +1271,7 @@ static int blkio_read_blkg_stats(struct blkio_cgroup *blkcg,
const char *dname = blkg_dev_name(blkg);
int plid = BLKIOFILE_POLICY(cft->private);
- if (!dname || plid != blkg->plid)
+ if (!dname)
continue;
if (pcpu) {
cgroup_total += blkio_get_stat_cpu(blkg, plid,
@@ -1335,9 +1382,9 @@ static int blkio_weight_write(struct blkio_cgroup *blkcg, int plid, u64 val)
blkcg->weight = (unsigned int)val;
hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
- struct blkg_policy_data *pd = blkg->pd[blkg->plid];
+ struct blkg_policy_data *pd = blkg->pd[plid];
- if (blkg->plid == plid && !pd->conf.weight)
+ if (!pd->conf.weight)
blkio_update_group_weight(blkg, plid, blkcg->weight);
}
@@ -1560,7 +1607,6 @@ static int blkiocg_pre_destroy(struct cgroup_subsys *subsys,
unsigned long flags;
struct blkio_group *blkg;
struct request_queue *q;
- struct blkio_policy_type *blkiop;
rcu_read_lock();
@@ -1586,11 +1632,7 @@ static int blkiocg_pre_destroy(struct cgroup_subsys *subsys,
*/
spin_lock(&blkio_list_lock);
spin_lock_irqsave(q->queue_lock, flags);
- list_for_each_entry(blkiop, &blkio_list, list) {
- if (blkiop->plid != blkg->plid)
- continue;
- blkg_destroy(blkg, blkiop->plid);
- }
+ blkg_destroy(blkg);
spin_unlock_irqrestore(q->queue_lock, flags);
spin_unlock(&blkio_list_lock);
} while (1);
@@ -1684,6 +1726,8 @@ void blkcg_exit_queue(struct request_queue *q)
list_del_init(&q->all_q_node);
mutex_unlock(&all_q_mutex);
+ blkg_destroy_all(q, true);
+
blk_throtl_exit(q);
}
@@ -1733,14 +1777,12 @@ static void blkcg_bypass_start(void)
__acquires(&all_q_mutex)
{
struct request_queue *q;
- int i;
mutex_lock(&all_q_mutex);
list_for_each_entry(q, &all_q_list, all_q_node) {
blk_queue_bypass_start(q);
- for (i = 0; i < BLKIO_NR_POLICIES; i++)
- blkg_destroy_all(q, i, false);
+ blkg_destroy_all(q, false);
}
}
@@ -1757,6 +1799,8 @@ static void blkcg_bypass_end(void)
void blkio_policy_register(struct blkio_policy_type *blkiop)
{
+ struct request_queue *q;
+
blkcg_bypass_start();
spin_lock(&blkio_list_lock);
@@ -1765,12 +1809,16 @@ void blkio_policy_register(struct blkio_policy_type *blkiop)
list_add_tail(&blkiop->list, &blkio_list);
spin_unlock(&blkio_list_lock);
+ list_for_each_entry(q, &all_q_list, all_q_node)
+ update_root_blkg_pd(q, blkiop->plid);
blkcg_bypass_end();
}
EXPORT_SYMBOL_GPL(blkio_policy_register);
void blkio_policy_unregister(struct blkio_policy_type *blkiop)
{
+ struct request_queue *q;
+
blkcg_bypass_start();
spin_lock(&blkio_list_lock);
@@ -1779,6 +1827,8 @@ void blkio_policy_unregister(struct blkio_policy_type *blkiop)
list_del_init(&blkiop->list);
spin_unlock(&blkio_list_lock);
+ list_for_each_entry(q, &all_q_list, all_q_node)
+ update_root_blkg_pd(q, blkiop->plid);
blkcg_bypass_end();
}
EXPORT_SYMBOL_GPL(blkio_policy_unregister);
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 83ce5fa0a604..6e8ee86a2870 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -178,13 +178,11 @@ struct blkg_policy_data {
struct blkio_group {
/* Pointer to the associated request_queue, RCU protected */
struct request_queue __rcu *q;
- struct list_head q_node[BLKIO_NR_POLICIES];
+ struct list_head q_node;
struct hlist_node blkcg_node;
struct blkio_cgroup *blkcg;
/* Store cgroup path */
char path[128];
- /* policy which owns this blk group */
- enum blkio_policy_id plid;
/* reference count */
int refcnt;
@@ -230,8 +228,9 @@ extern void blkcg_exit_queue(struct request_queue *q);
/* Blkio controller policy registration */
extern void blkio_policy_register(struct blkio_policy_type *);
extern void blkio_policy_unregister(struct blkio_policy_type *);
-extern void blkg_destroy_all(struct request_queue *q,
- enum blkio_policy_id plid, bool destroy_root);
+extern void blkg_destroy_all(struct request_queue *q, bool destroy_root);
+extern void update_root_blkg_pd(struct request_queue *q,
+ enum blkio_policy_id plid);
/**
* blkg_to_pdata - get policy private data
@@ -313,8 +312,9 @@ static inline void blkcg_exit_queue(struct request_queue *q) { }
static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
static inline void blkg_destroy_all(struct request_queue *q,
- enum blkio_policy_id plid,
bool destory_root) { }
+static inline void update_root_blkg_pd(struct request_queue *q,
+ enum blkio_policy_id plid) { }
static inline void *blkg_to_pdata(struct blkio_group *blkg,
struct blkio_policy_type *pol) { return NULL; }
@@ -382,8 +382,7 @@ extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
extern struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk);
extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
- struct request_queue *q,
- enum blkio_policy_id plid);
+ struct request_queue *q);
struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
struct request_queue *q,
enum blkio_policy_id plid,
diff --git a/block/blk-core.c b/block/blk-core.c
index 83a47fcf5946..05693f403e46 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -548,8 +548,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
INIT_LIST_HEAD(&q->timeout_list);
INIT_LIST_HEAD(&q->icq_list);
#ifdef CONFIG_BLK_CGROUP
- INIT_LIST_HEAD(&q->blkg_list[0]);
- INIT_LIST_HEAD(&q->blkg_list[1]);
+ INIT_LIST_HEAD(&q->blkg_list);
#endif
INIT_LIST_HEAD(&q->flush_queue[0]);
INIT_LIST_HEAD(&q->flush_queue[1]);
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 00cdc987b525..aa41b47c22d2 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -480,6 +480,8 @@ static void blk_release_queue(struct kobject *kobj)
blk_sync_queue(q);
+ blkcg_exit_queue(q);
+
if (q->elevator) {
spin_lock_irq(q->queue_lock);
ioc_clear_queue(q);
@@ -487,8 +489,6 @@ static void blk_release_queue(struct kobject *kobj)
elevator_exit(q->elevator);
}
- blkcg_exit_queue(q);
-
if (rl->rq_pool)
mempool_destroy(rl->rq_pool);
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 132941260e58..e35ee7aeea69 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -167,7 +167,7 @@ throtl_grp *throtl_lookup_tg(struct throtl_data *td, struct blkio_cgroup *blkcg)
if (blkcg == &blkio_root_cgroup)
return td->root_tg;
- return blkg_to_tg(blkg_lookup(blkcg, td->queue, BLKIO_POLICY_THROTL));
+ return blkg_to_tg(blkg_lookup(blkcg, td->queue));
}
static struct throtl_grp *throtl_lookup_create_tg(struct throtl_data *td,
@@ -704,8 +704,7 @@ static void throtl_process_limit_change(struct throtl_data *td)
throtl_log(td, "limits changed");
- list_for_each_entry_safe(blkg, n, &q->blkg_list[BLKIO_POLICY_THROTL],
- q_node[BLKIO_POLICY_THROTL]) {
+ list_for_each_entry_safe(blkg, n, &q->blkg_list, q_node) {
struct throtl_grp *tg = blkg_to_tg(blkg);
if (!tg->limits_changed)
@@ -1054,11 +1053,9 @@ void blk_throtl_exit(struct request_queue *q)
throtl_shutdown_wq(q);
- blkg_destroy_all(q, BLKIO_POLICY_THROTL, true);
-
/* If there are other groups */
spin_lock_irq(q->queue_lock);
- wait = q->nr_blkgs[BLKIO_POLICY_THROTL];
+ wait = q->nr_blkgs;
spin_unlock_irq(q->queue_lock);
/*
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index dc73690dec44..393eaa59913b 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -3462,15 +3462,13 @@ static void cfq_exit_queue(struct elevator_queue *e)
spin_unlock_irq(q->queue_lock);
- blkg_destroy_all(q, BLKIO_POLICY_PROP, true);
-
#ifdef CONFIG_BLK_CGROUP
/*
* If there are groups which we could not unlink from blkcg list,
* wait for a rcu period for them to be freed.
*/
spin_lock_irq(q->queue_lock);
- wait = q->nr_blkgs[BLKIO_POLICY_PROP];
+ wait = q->nr_blkgs;
spin_unlock_irq(q->queue_lock);
#endif
cfq_shutdown_timer_wq(cfqd);
@@ -3492,6 +3490,7 @@ static void cfq_exit_queue(struct elevator_queue *e)
#ifndef CONFIG_CFQ_GROUP_IOSCHED
kfree(cfqd->root_group);
#endif
+ update_root_blkg_pd(q, BLKIO_POLICY_PROP);
kfree(cfqd);
}
diff --git a/block/elevator.c b/block/elevator.c
index d4d39dab841a..451654fadab0 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -876,7 +876,7 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
{
struct elevator_queue *old = q->elevator;
bool registered = old->registered;
- int i, err;
+ int err;
/*
* Turn on BYPASS and drain all requests w/ elevator private data.
@@ -895,8 +895,7 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
ioc_clear_queue(q);
spin_unlock_irq(q->queue_lock);
- for (i = 0; i < BLKIO_NR_POLICIES; i++)
- blkg_destroy_all(q, i, false);
+ blkg_destroy_all(q, false);
/* allocate, init and register new elevator */
err = -ENOMEM;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 06:36:58 +0000