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dm: add support for passing through persistent reservations

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This adds support to pass through persistent reservation requests
similar to the existing ioctl handling, and with the same limitations,
e.g. devices may only have a single target attached.

This is mostly intended for multipathing.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Christoph Hellwig
2015-10-15 14:10:51 +02:00
committed by Mike Snitzer
parent e56f81e0b0
commit 71cdb6978a
3 changed files with 126 additions and 3 deletions
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4
include/uapi/linux/dm-ioctl.h
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@@ -267,9 +267,9 @@ 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 33
#define DM_VERSION_MINOR 34
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2015-8-18)"
#define DM_VERSION_EXTRA "-ioctl (2015-10-28)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */