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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 <[email protected]>
Cc: Niel Lambrechts <[email protected]>
Cc: James Bottomley <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2009-09-11 14:26:40 +02:00 • committed by Jens Axboe
commit da6c5c720c
3 changed files with 4 additions and 21 deletions
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6
drivers/scsi/scsi_lib.c
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@ -897,8 +897,10 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
if (driver_byte(result) & DRIVER_SENSE)
scsi_print_sense("", cmd);
}
blk_end_request_all(req, -EIO);
scsi_next_command(cmd);
if (blk_end_request_err(req, -EIO))
scsi_requeue_command(q, cmd);
else
scsi_next_command(cmd);
break;
case ACTION_REPREP:
/* Unprep the request and put it back at the head of the queue.