From cc6cbe141a20f6d876b161b60af38d93935bfa85 Mon Sep 17 00:00:00 2001 From: Alasdair G Kergon Date: Mon, 31 Oct 2011 20:19:02 +0000 Subject: dm table: add always writeable feature Add a target feature flag DM_TARGET_ALWAYS_WRITEABLE to indicate that a target does not support read-only mode. The initial implementation of the thin provisioning target uses this. Signed-off-by: Alasdair G Kergon --- include/linux/device-mapper.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include/linux/device-mapper.h') diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 294e78a7fcc..cc58e2d7c03 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -166,6 +166,13 @@ struct target_type { #define DM_TARGET_SINGLETON 0x00000001 #define dm_target_needs_singleton(type) ((type)->features & DM_TARGET_SINGLETON) +/* + * Indicates that a target does not support read-only devices. + */ +#define DM_TARGET_ALWAYS_WRITEABLE 0x00000002 +#define dm_target_always_writeable(type) \ + ((type)->features & DM_TARGET_ALWAYS_WRITEABLE) + struct dm_target { struct dm_table *table; struct target_type *type; -- cgit v1.2.3