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block: handle partial completions for special payload requests 

SCSI devices can return short writes on Write Same just like for normal
writes, so we need to handle this case for our special payload requests
as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Tested-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2017-05-11 12:34:38 +02:00 committed by Jens Axboe
parent f36ea50ca0
commit ed6565e734
1 changed files with 12 additions and 12 deletions
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24
block/blk-core.c
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@ -2644,8 +2644,6 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
return false;
}
WARN_ON_ONCE(req->rq_flags & RQF_SPECIAL_PAYLOAD);
req->__data_len -= total_bytes;
/* update sector only for requests with clear definition of sector */
@ -2658,17 +2656,19 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
req->cmd_flags |= req->bio->bi_opf & REQ_FAILFAST_MASK;
}
/*
* If total number of sectors is less than the first segment
* size, something has gone terribly wrong.
*/
if (blk_rq_bytes(req) < blk_rq_cur_bytes(req)) {
blk_dump_rq_flags(req, "request botched");
req->__data_len = blk_rq_cur_bytes(req);
}
if (!(req->rq_flags & RQF_SPECIAL_PAYLOAD)) {
/*
* If total number of sectors is less than the first segment
* size, something has gone terribly wrong.
*/
if (blk_rq_bytes(req) < blk_rq_cur_bytes(req)) {
blk_dump_rq_flags(req, "request botched");
req->__data_len = blk_rq_cur_bytes(req);
}
/* recalculate the number of segments */
blk_recalc_rq_segments(req);
/* recalculate the number of segments */
blk_recalc_rq_segments(req);
}
return true;
}