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block: Replace SG_GAPS with new queue limits mask

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The SG_GAPS queue flag caused checks for bio vector alignment against
PAGE_SIZE, but the device may have different constraints. This patch
adds a queue limits so a driver with such constraints can set to allow
requests that would have been unnecessarily split. The new gaps check
takes the request_queue as a parameter to simplify the logic around
invoking this function.

This new limit makes the queue flag redundant, so removing it and
all usage. Device-mappers will inherit the correct settings through
blk_stack_limits().

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch
2015-08-19 14:24:05 -07:00
committed by Jens Axboe
parent d2be537c3b
commit 03100aada9
7 changed files with 43 additions and 42 deletions
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block/bio.c
+1 -2
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@@ -742,8 +742,7 @@ int bio_add_pc_page(struct request_queue *q, struct bio *bio, struct page
* If the queue doesn't support SG gaps and adding this
* offset would create a gap, disallow it.
*/
if (q->queue_flags & (1 << QUEUE_FLAG_SG_GAPS) &&
bvec_gap_to_prev(prev, offset))
if (bvec_gap_to_prev(q, prev, offset))
return 0;
}