xref: /linux/include/linux/drbd_genl_api.h (revision 9a87ffc99ec8eb8d35eed7c4f816d75f5cc9662e)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef DRBD_GENL_STRUCT_H
3 #define DRBD_GENL_STRUCT_H
4 
5 /**
6  * struct drbd_genlmsghdr - DRBD specific header used in NETLINK_GENERIC requests
7  * @minor:
8  *     For admin requests (user -> kernel): which minor device to operate on.
9  *     For (unicast) replies or informational (broadcast) messages
10  *     (kernel -> user): which minor device the information is about.
11  *     If we do not operate on minors, but on connections or resources,
12  *     the minor value shall be (~0), and the attribute DRBD_NLA_CFG_CONTEXT
13  *     is used instead.
14  * @flags: possible operation modifiers (relevant only for user->kernel):
15  *     DRBD_GENL_F_SET_DEFAULTS
16  * @volume:
17  *     When creating a new minor (adding it to a resource), the resource needs
18  *     to know which volume number within the resource this is supposed to be.
19  *     The volume number corresponds to the same volume number on the remote side,
20  *     whereas the minor number on the remote side may be different
21  *     (union with flags).
22  * @ret_code: kernel->userland unicast cfg reply return code (union with flags);
23  */
24 struct drbd_genlmsghdr {
25 	__u32 minor;
26 	union {
27 	__u32 flags;
28 	__s32 ret_code;
29 	};
30 };
31 
32 /* To be used in drbd_genlmsghdr.flags */
33 enum {
34 	DRBD_GENL_F_SET_DEFAULTS = 1,
35 };
36 
37 enum drbd_state_info_bcast_reason {
38 	SIB_GET_STATUS_REPLY = 1,
39 	SIB_STATE_CHANGE = 2,
40 	SIB_HELPER_PRE = 3,
41 	SIB_HELPER_POST = 4,
42 	SIB_SYNC_PROGRESS = 5,
43 };
44 
45 /* hack around predefined gcc/cpp "linux=1",
46  * we cannot possibly include <1/drbd_genl.h> */
47 #undef linux
48 
49 #include <linux/drbd.h>
50 #define GENL_MAGIC_VERSION	1
51 #define GENL_MAGIC_FAMILY	drbd
52 #define GENL_MAGIC_FAMILY_HDRSZ	sizeof(struct drbd_genlmsghdr)
53 #define GENL_MAGIC_INCLUDE_FILE <linux/drbd_genl.h>
54 #include <linux/genl_magic_struct.h>
55 
56 #endif
57