diff options
| author | Bart Van Assche <bart.vanassche@sandisk.com> | 2017-06-01 17:55:11 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-06-01 21:02:58 +0200 |
| commit | 8ef1a191038c138d5675933cd69d47747d0d396b (patch) | |
| tree | 2c4827b922d95f6b7a06a4dd4803b73ca82be993 | |
| parent | blk-mq-debugfs: Show atomic request flags (diff) | |
| download | linux-8ef1a191038c138d5675933cd69d47747d0d396b.tar.xz linux-8ef1a191038c138d5675933cd69d47747d0d396b.zip | |
blk-mq-debugfs: Show requeue list
When verifying whether or not a blk-mq driver forgot to kick the
requeue list after having requeued a request it is important to
be able to verify the contents of the requeue list. Hence export
that list through debugfs.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Eduardo Valentin <eduval@amazon.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-mq-debugfs.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index d56ddd7a1285..8b06a12c1461 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -308,6 +308,37 @@ int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) } EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); +static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) + __acquires(&q->requeue_lock) +{ + struct request_queue *q = m->private; + + spin_lock_irq(&q->requeue_lock); + return seq_list_start(&q->requeue_list, *pos); +} + +static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct request_queue *q = m->private; + + return seq_list_next(v, &q->requeue_list, pos); +} + +static void queue_requeue_list_stop(struct seq_file *m, void *v) + __releases(&q->requeue_lock) +{ + struct request_queue *q = m->private; + + spin_unlock_irq(&q->requeue_lock); +} + +static const struct seq_operations queue_requeue_list_seq_ops = { + .start = queue_requeue_list_start, + .next = queue_requeue_list_next, + .stop = queue_requeue_list_stop, + .show = blk_mq_debugfs_rq_show, +}; + static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) __acquires(&hctx->lock) { @@ -665,6 +696,7 @@ const struct file_operations blk_mq_debugfs_fops = { static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { {"poll_stat", 0400, queue_poll_stat_show}, + {"requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops}, {"state", 0600, queue_state_show, queue_state_write}, {}, }; |