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block: warn if sharing request queue across gendisks

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Now that the remaining drivers have been converted to one request queue
per gendisk, let's warn if a request queue gets registered more than
once. This will catch future drivers which might do it inadvertently or
any old drivers that I may have missed.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Omar Sandoval
2017-03-28 16:12:15 -07:00
committed by Jens Axboe
parent d3cfb2a0ac
commit 334335d2f7
2 changed files with 8 additions and 0 deletions
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include/linux/blkdev.h
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@@ -617,6 +617,7 @@ struct request_queue {
#define QUEUE_FLAG_STATS 27 /* track rq completion times */
#define QUEUE_FLAG_RESTART 28 /* queue needs restart at completion */
#define QUEUE_FLAG_POLL_STATS 29 /* collecting stats for hybrid polling */
#define QUEUE_FLAG_REGISTERED 30 /* queue has been registered to a disk */
#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
(1 << QUEUE_FLAG_STACKABLE) | \