block/rq_qos: protect rq_qos apis with a new lock

commit 50e34d78815e ("block: disable the elevator int del_gendisk")
move rq_qos_exit() from disk_release() to del_gendisk(), this will
introduce some problems:

1) If rq_qos_add() is triggered by enabling iocost/iolatency through
   cgroupfs, then it can concurrent with del_gendisk(), it's not safe to
   write 'q->rq_qos' concurrently.

2) Activate cgroup policy that is relied on rq_qos will call
   rq_qos_add() and blkcg_activate_policy(), and if rq_qos_exit() is
   called in the middle, null-ptr-dereference will be triggered in
   blkcg_activate_policy().

3) blkg_conf_open_bdev() can call blkdev_get_no_open() first to find the
   disk, then if rq_qos_exit() from del_gendisk() is done before
   rq_qos_add(), then memory will be leaked.

This patch add a new disk level mutex 'rq_qos_mutex':

1) The lock will protect rq_qos_exit() directly.

2) For wbt that doesn't relied on blk-cgroup, rq_qos_add() can only be
   called from disk initialization for now because wbt can't be
   destructed until rq_qos_exit(), so it's safe not to protect wbt for
   now. Hoever, in case that rq_qos dynamically destruction is supported
   in the furture, this patch also protect rq_qos_add() from wbt_init()
   directly, this is enough because blk-sysfs already synchronize
   writers with disk removal.

3) For iocost and iolatency, in order to synchronize disk removal and
   cgroup configuration, the lock is held after blkdev_get_no_open()
   from blkg_conf_open_bdev(), and is released in blkg_conf_exit().
   In order to fix the above memory leak, disk_live() is checked after
   holding the new lock.

Fixes: 50e34d78815e ("block: disable the elevator int del_gendisk")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20230414084008.2085155-1-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 0ce64dd..1c6716f 100644 (file)
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -748,6 +748,13 @@ int blkg_conf_open_bdev(struct blkg_conf_ctx *ctx)
                return -ENODEV;
        }
 
+       mutex_lock(&bdev->bd_queue->rq_qos_mutex);
+       if (!disk_live(bdev->bd_disk)) {
+               blkdev_put_no_open(bdev);
+               mutex_unlock(&bdev->bd_queue->rq_qos_mutex);
+               return -ENODEV;
+       }
+
        ctx->body = input;
        ctx->bdev = bdev;
        return 0;
@@ -892,6 +899,7 @@ EXPORT_SYMBOL_GPL(blkg_conf_prep);
  */
 void blkg_conf_exit(struct blkg_conf_ctx *ctx)
        __releases(&ctx->bdev->bd_queue->queue_lock)
+       __releases(&ctx->bdev->bd_queue->rq_qos_mutex)
 {
        if (ctx->blkg) {
                spin_unlock_irq(&bdev_get_queue(ctx->bdev)->queue_lock);
@@ -899,6 +907,7 @@ void blkg_conf_exit(struct blkg_conf_ctx *ctx)
        }
 
        if (ctx->bdev) {
+               mutex_unlock(&ctx->bdev->bd_queue->rq_qos_mutex);
                blkdev_put_no_open(ctx->bdev);
                ctx->body = NULL;
                ctx->bdev = NULL;

diff --git a/block/blk-core.c b/block/blk-core.c
index 00c7433..2ae22be 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -420,6 +420,7 @@ struct request_queue *blk_alloc_queue(int node_id)
        mutex_init(&q->debugfs_mutex);
        mutex_init(&q->sysfs_lock);
        mutex_init(&q->sysfs_dir_lock);
+       mutex_init(&q->rq_qos_mutex);
        spin_lock_init(&q->queue_lock);
 
        init_waitqueue_head(&q->mq_freeze_wq);

diff --git a/block/blk-rq-qos.c b/block/blk-rq-qos.c
index d8cc820..167be74 100644 (file)
--- a/block/blk-rq-qos.c
+++ b/block/blk-rq-qos.c
@@ -288,11 +288,13 @@ void rq_qos_wait(struct rq_wait *rqw, void *private_data,
 
 void rq_qos_exit(struct request_queue *q)
 {
+       mutex_lock(&q->rq_qos_mutex);
        while (q->rq_qos) {
                struct rq_qos *rqos = q->rq_qos;
                q->rq_qos = rqos->next;
                rqos->ops->exit(rqos);
        }
+       mutex_unlock(&q->rq_qos_mutex);
 }
 
 int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
@@ -300,6 +302,8 @@ int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
 {
        struct request_queue *q = disk->queue;
 
+       lockdep_assert_held(&q->rq_qos_mutex);
+
        rqos->disk = disk;
        rqos->id = id;
        rqos->ops = ops;
@@ -307,18 +311,13 @@ int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
        /*
         * No IO can be in-flight when adding rqos, so freeze queue, which
         * is fine since we only support rq_qos for blk-mq queue.
-        *
-        * Reuse ->queue_lock for protecting against other concurrent
-        * rq_qos adding/deleting
         */
        blk_mq_freeze_queue(q);
 
-       spin_lock_irq(&q->queue_lock);
        if (rq_qos_id(q, rqos->id))
                goto ebusy;
        rqos->next = q->rq_qos;
        q->rq_qos = rqos;
-       spin_unlock_irq(&q->queue_lock);
 
        blk_mq_unfreeze_queue(q);
 
@@ -330,7 +329,6 @@ int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
 
        return 0;
 ebusy:
-       spin_unlock_irq(&q->queue_lock);
        blk_mq_unfreeze_queue(q);
        return -EBUSY;
 }
@@ -340,21 +338,15 @@ void rq_qos_del(struct rq_qos *rqos)
        struct request_queue *q = rqos->disk->queue;
        struct rq_qos **cur;
 
-       /*
-        * See comment in rq_qos_add() about freezing queue & using
-        * ->queue_lock.
-        */
-       blk_mq_freeze_queue(q);
+       lockdep_assert_held(&q->rq_qos_mutex);
 
-       spin_lock_irq(&q->queue_lock);
+       blk_mq_freeze_queue(q);
        for (cur = &q->rq_qos; *cur; cur = &(*cur)->next) {
                if (*cur == rqos) {
                        *cur = rqos->next;
                        break;
                }
        }
-       spin_unlock_irq(&q->queue_lock);
-
        blk_mq_unfreeze_queue(q);
 
        mutex_lock(&q->debugfs_mutex);

diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index e49a486..53bf5aa 100644 (file)
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -942,7 +942,9 @@ int wbt_init(struct gendisk *disk)
        /*
         * Assign rwb and add the stats callback.
         */
+       mutex_lock(&q->rq_qos_mutex);
        ret = rq_qos_add(&rwb->rqos, disk, RQ_QOS_WBT, &wbt_rqos_ops);
+       mutex_unlock(&q->rq_qos_mutex);
        if (ret)
                goto err_free;
 

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index fe99948..b2ac587 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -392,6 +392,7 @@ struct request_queue {
 
        struct blk_queue_stats  *stats;
        struct rq_qos           *rq_qos;
+       struct mutex            rq_qos_mutex;
 
        const struct blk_mq_ops *mq_ops;