scsi: always assign block layer tags if enabled

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Allow a driver to ask for block layer tags by setting .use_blk_tags in the
host template, in which case it will always see a valid value in
request->tag, similar to the behavior when using blk-mq.  This means even
SCSI "untagged" commands will now have a tag, which is especially useful
when using a host-wide tag map.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>

...

This commit is contained in:

Christoph Hellwig 2014-11-03 14:09:02 +01:00

parent e2eddf4d53

commit 2ecb204d07

33 changed files with 86 additions and 168 deletions

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5

include/scsi/scsi_host.h

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34

include/scsi/scsi_tcq.h

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