diff options
| author | Christoph Hellwig <hch@lst.de> | 2022-06-19 08:05:51 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-06-28 06:30:26 -0600 |
| commit | 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 (patch) | |
| tree | 6d945fbe71814027c249acb00b86c6f35e6adfda /block/blk-mq.c | |
| parent | 0e3534022f26ae51f7cf28347a253230604b6f4e (diff) | |
block: simplify disk shutdown
Set the queue dying flag and call blk_mq_exit_queue from del_gendisk for
all disks that do not have separately allocated queues, and thus remove
the need to call blk_cleanup_queue for them.
Rename blk_cleanup_disk to blk_mq_destroy_queue to make it clear that
this function is intended only for separately allocated blk-mq queues.
This saves an extra queue freeze for devices without a separately
allocated queue.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20220619060552.1850436-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.c')
| -rw-r--r-- | block/blk-mq.c | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 92aae03103b7..b1dbc4b2c2c9 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3902,7 +3902,7 @@ static struct request_queue *blk_mq_init_queue_data(struct blk_mq_tag_set *set, q->queuedata = queuedata; ret = blk_mq_init_allocated_queue(set, q); if (ret) { - blk_cleanup_queue(q); + blk_put_queue(q); return ERR_PTR(ret); } return q; @@ -3914,6 +3914,35 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set) } EXPORT_SYMBOL(blk_mq_init_queue); +/** + * blk_mq_destroy_queue - shutdown a request queue + * @q: request queue to shutdown + * + * This shuts down a request queue allocated by blk_mq_init_queue() and drops + * the initial reference. All future requests will failed with -ENODEV. + * + * Context: can sleep + */ +void blk_mq_destroy_queue(struct request_queue *q) +{ + WARN_ON_ONCE(!queue_is_mq(q)); + WARN_ON_ONCE(blk_queue_registered(q)); + + might_sleep(); + + blk_queue_flag_set(QUEUE_FLAG_DYING, q); + blk_queue_start_drain(q); + blk_freeze_queue(q); + + blk_sync_queue(q); + blk_mq_cancel_work_sync(q); + blk_mq_exit_queue(q); + + /* @q is and will stay empty, shutdown and put */ + blk_put_queue(q); +} +EXPORT_SYMBOL(blk_mq_destroy_queue); + struct gendisk *__blk_mq_alloc_disk(struct blk_mq_tag_set *set, void *queuedata, struct lock_class_key *lkclass) { @@ -3926,13 +3955,23 @@ struct gendisk *__blk_mq_alloc_disk(struct blk_mq_tag_set *set, void *queuedata, disk = __alloc_disk_node(q, set->numa_node, lkclass); if (!disk) { - blk_cleanup_queue(q); + blk_put_queue(q); return ERR_PTR(-ENOMEM); } + set_bit(GD_OWNS_QUEUE, &disk->state); return disk; } EXPORT_SYMBOL(__blk_mq_alloc_disk); +struct gendisk *blk_mq_alloc_disk_for_queue(struct request_queue *q, + struct lock_class_key *lkclass) +{ + if (!blk_get_queue(q)) + return NULL; + return __alloc_disk_node(q, NUMA_NO_NODE, lkclass); +} +EXPORT_SYMBOL(blk_mq_alloc_disk_for_queue); + static struct blk_mq_hw_ctx *blk_mq_alloc_and_init_hctx( struct blk_mq_tag_set *set, struct request_queue *q, int hctx_idx, int node) |