diff options
Diffstat (limited to 'block/blk-cgroup.c')
| -rw-r--r-- | block/blk-cgroup.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 2d4d7d6d9ae..f6581a090b9 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -464,17 +464,19 @@ EXPORT_SYMBOL_GPL(blkg_prfill_rwstat); /** * blkg_conf_prep - parse and prepare for per-blkg config update * @blkcg: target block cgroup + * @pol: target policy * @input: input string * @ctx: blkg_conf_ctx to be filled * * Parse per-blkg config update from @input and initialize @ctx with the * result. @ctx->blkg points to the blkg to be updated and @ctx->v the new - * value. This function returns with RCU read locked and must be paired - * with blkg_conf_finish(). + * value. This function returns with RCU read lock and queue lock held and + * must be paired with blkg_conf_finish(). */ -int blkg_conf_prep(struct blkio_cgroup *blkcg, const char *input, +int blkg_conf_prep(struct blkio_cgroup *blkcg, + const struct blkio_policy_type *pol, const char *input, struct blkg_conf_ctx *ctx) - __acquires(rcu) + __acquires(rcu) __acquires(disk->queue->queue_lock) { struct gendisk *disk; struct blkio_group *blkg; @@ -490,14 +492,14 @@ int blkg_conf_prep(struct blkio_cgroup *blkcg, const char *input, return -EINVAL; rcu_read_lock(); - spin_lock_irq(disk->queue->queue_lock); + blkg = blkg_lookup_create(blkcg, disk->queue, false); - spin_unlock_irq(disk->queue->queue_lock); if (IS_ERR(blkg)) { ret = PTR_ERR(blkg); rcu_read_unlock(); + spin_unlock_irq(disk->queue->queue_lock); put_disk(disk); /* * If queue was bypassing, we should retry. Do so after a @@ -527,8 +529,9 @@ EXPORT_SYMBOL_GPL(blkg_conf_prep); * with blkg_conf_prep(). */ void blkg_conf_finish(struct blkg_conf_ctx *ctx) - __releases(rcu) + __releases(ctx->disk->queue->queue_lock) __releases(rcu) { + spin_unlock_irq(ctx->disk->queue->queue_lock); rcu_read_unlock(); put_disk(ctx->disk); } |