Commit f2101842 authored Mar 03, 2016 by Christoph Hellwig Committed by Jens Axboe Mar 03, 2016

block: fix blk_rq_get_max_sectors for driver private requests



Driver private request types should not get the artifical cap for the
FS requests.  This is important to use the full device capabilities
for internal command or NVMe pass through commands.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Jeff Lien <Jeff.Lien@hgst.com>
Tested-by: Jeff Lien <Jeff.Lien@hgst.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>

Updated by me to use an explicit check for the one command type that
does support extended checking, instead of relying on the ordering
of the enum command values - as suggested by Keith.

Signed-off-by: Jens Axboe <axboe@fb.com>

parent 45686b61

include/linux/blkdev.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -895,7 +895,7 @@ static inline unsigned int blk_rq_get_max_sectors(struct request *rq)
		{
		struct request_queue *q = rq->q;

		if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC))
		if (unlikely(rq->cmd_type != REQ_TYPE_FS))
		return q->limits.max_hw_sectors;

		if (!q->limits.chunk_sectors \|\| (rq->cmd_flags & REQ_DISCARD))

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