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scsi,block: update SCSI to handle mixed merge failures

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Update scsi_io_completion() such that it only fails requests till the
next error boundary and retry the leftover.  This enables block layer
to merge requests with different failfast settings and still behave
correctly on errors.  Allow merge of requests of different failfast
settings.

As SCSI is currently the only subsystem which follows failfast status,
there's no need to worry about other block drivers for now.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Niel Lambrechts <niel.lambrechts@gmail.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Tejun Heo
2009-09-11 14:26:40 +02:00
committed by Jens Axboe
parent 80a761fd33
commit da6c5c720c
3 changed files with 4 additions and 21 deletions
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block/blk-merge.c
-6
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@@ -380,12 +380,6 @@ static int attempt_merge(struct request_queue *q, struct request *req,
if (blk_integrity_rq(req) != blk_integrity_rq(next))
return 0;
/* don't merge requests of different failfast settings */
if (blk_failfast_dev(req) != blk_failfast_dev(next) ||
blk_failfast_transport(req) != blk_failfast_transport(next) ||
blk_failfast_driver(req) != blk_failfast_driver(next))
return 0;
/*
* If we are allowed to merge, then append bio list
* from next to rq and release next. merge_requests_fn