dm: allow targets to return output from messages they are sent

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Could be useful for a target to return stats or other information.
If a target does DMEMIT() anything to @result from its .message method
then it must return 1 to the caller.

Signed-off-By: Mike Snitzer <snitzer@redhat.com>

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This commit is contained in:

Mike Snitzer 2018-02-28 15:59:59 -05:00

parent da5dadb4f1

commit 1eb5fa849f

11 changed files with 21 additions and 12 deletions

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3

include/linux/device-mapper.h

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4

include/uapi/linux/dm-ioctl.h

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