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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>
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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4
include/uapi/linux/dm-ioctl.h
View file

@ -270,9 +270,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
#define DM_VERSION_MINOR 37
#define DM_VERSION_MINOR 38
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2017-09-20)"
#define DM_VERSION_EXTRA "-ioctl (2018-02-28)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */