diff options
| author | Alasdair G Kergon <agk@redhat.com> | 2011-10-31 20:19:04 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2011-10-31 20:19:04 +0000 |
| commit | 36a0456fbf2d9680bf9af81b39daf4a8e22cb1b8 (patch) | |
| tree | a19af18640d538e8357c195e6b4c77d0f6c92391 /include/linux | |
| parent | cc6cbe141a20f6d876b161b60af38d93935bfa85 (diff) | |
dm table: add immutable feature
Introduce DM_TARGET_IMMUTABLE to indicate that the target type cannot be mixed
with any other target type, and once loaded into a device, it cannot be
replaced with a table containing a different type.
The thin provisioning pool device will use this.
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/device-mapper.h | 7 | ||||
| -rw-r--r-- | include/linux/dm-ioctl.h | 4 |
2 files changed, 9 insertions, 2 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index cc58e2d7c032..98f34b886f95 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -173,6 +173,13 @@ struct target_type { #define dm_target_always_writeable(type) \ ((type)->features & DM_TARGET_ALWAYS_WRITEABLE) +/* + * Any device that contains a table with an instance of this target may never + * have tables containing any different target type. + */ +#define DM_TARGET_IMMUTABLE 0x00000004 +#define dm_target_is_immutable(type) ((type)->features & DM_TARGET_IMMUTABLE) + struct dm_target { struct dm_table *table; struct target_type *type; diff --git a/include/linux/dm-ioctl.h b/include/linux/dm-ioctl.h index 0cb8eff76bd6..75fd5573516e 100644 --- a/include/linux/dm-ioctl.h +++ b/include/linux/dm-ioctl.h @@ -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 21 +#define DM_VERSION_MINOR 22 #define DM_VERSION_PATCHLEVEL 0 -#define DM_VERSION_EXTRA "-ioctl (2011-07-06)" +#define DM_VERSION_EXTRA "-ioctl (2011-10-19)" /* Status bits */ #define DM_READONLY_FLAG (1 << 0) /* In/Out */ |