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-rw-r--r--block/blk-cgroup.c48
-rw-r--r--include/linux/blkdev.h3
2 files changed, 50 insertions, 1 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index b302ce1..266c070 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -27,6 +27,9 @@
static DEFINE_SPINLOCK(blkio_list_lock);
static LIST_HEAD(blkio_list);
+static DEFINE_MUTEX(all_q_mutex);
+static LIST_HEAD(all_q_list);
+
struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT };
EXPORT_SYMBOL_GPL(blkio_root_cgroup);
@@ -1472,9 +1475,20 @@ done:
*/
int blkcg_init_queue(struct request_queue *q)
{
+ int ret;
+
might_sleep();
- return blk_throtl_init(q);
+ ret = blk_throtl_init(q);
+ if (ret)
+ return ret;
+
+ mutex_lock(&all_q_mutex);
+ INIT_LIST_HEAD(&q->all_q_node);
+ list_add_tail(&q->all_q_node, &all_q_list);
+ mutex_unlock(&all_q_mutex);
+
+ return 0;
}
/**
@@ -1498,6 +1512,10 @@ void blkcg_drain_queue(struct request_queue *q)
*/
void blkcg_exit_queue(struct request_queue *q)
{
+ mutex_lock(&all_q_mutex);
+ list_del_init(&q->all_q_node);
+ mutex_unlock(&all_q_mutex);
+
blk_throtl_exit(q);
}
@@ -1543,8 +1561,33 @@ static void blkiocg_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
}
}
+static void blkcg_bypass_start(void)
+ __acquires(&all_q_mutex)
+{
+ struct request_queue *q;
+
+ mutex_lock(&all_q_mutex);
+
+ list_for_each_entry(q, &all_q_list, all_q_node) {
+ blk_queue_bypass_start(q);
+ blkg_destroy_all(q);
+ }
+}
+
+static void blkcg_bypass_end(void)
+ __releases(&all_q_mutex)
+{
+ struct request_queue *q;
+
+ list_for_each_entry(q, &all_q_list, all_q_node)
+ blk_queue_bypass_end(q);
+
+ mutex_unlock(&all_q_mutex);
+}
+
void blkio_policy_register(struct blkio_policy_type *blkiop)
{
+ blkcg_bypass_start();
spin_lock(&blkio_list_lock);
BUG_ON(blkio_policy[blkiop->plid]);
@@ -1552,11 +1595,13 @@ void blkio_policy_register(struct blkio_policy_type *blkiop)
list_add_tail(&blkiop->list, &blkio_list);
spin_unlock(&blkio_list_lock);
+ blkcg_bypass_end();
}
EXPORT_SYMBOL_GPL(blkio_policy_register);
void blkio_policy_unregister(struct blkio_policy_type *blkiop)
{
+ blkcg_bypass_start();
spin_lock(&blkio_list_lock);
BUG_ON(blkio_policy[blkiop->plid] != blkiop);
@@ -1564,5 +1609,6 @@ void blkio_policy_unregister(struct blkio_policy_type *blkiop)
list_del_init(&blkiop->list);
spin_unlock(&blkio_list_lock);
+ blkcg_bypass_end();
}
EXPORT_SYMBOL_GPL(blkio_policy_unregister);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 315db1d..e8c0bbd 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -397,6 +397,9 @@ struct request_queue {
struct bsg_class_device bsg_dev;
#endif
+#ifdef CONFIG_BLK_CGROUP
+ struct list_head all_q_node;
+#endif
#ifdef CONFIG_BLK_DEV_THROTTLING
/* Throttle data */
struct throtl_data *td;
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