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dm rq: change ->rq_end_io calling conventions

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Instead of returning either a DM_ENDIO_* constant or an error code, add
a new DM_ENDIO_DONE value that means keep errno as is.  This allows us
to easily keep the existing error code in case where we can't push back,
and it also preparares for the new block level status codes with strict
type checking.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Christoph Hellwig 2017-04-26 09:40:37 +02:00 • committed by Mike Snitzer
parent b79f10eefd
commit 7ed8578a96
3 changed files with 20 additions and 11 deletions
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1
include/linux/device-mapper.h
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@ -593,6 +593,7 @@ extern struct ratelimit_state dm_ratelimit_state;
/*
* Definitions of return values from target end_io function.
*/
#define DM_ENDIO_DONE 0
#define DM_ENDIO_INCOMPLETE 1
#define DM_ENDIO_REQUEUE 2