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Merge branch 'bkl/procfs' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic...
[linux-2.6-block.git] / include / linux / drbd.h
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b411b363
PR		 1/*
2 drbd.h
3 Kernel module for 2.6.x Kernels
4
5 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
6
7 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
8 Copyright (C) 2001-2008, Philipp Reisner <philipp.reisner@linbit.com>.
9 Copyright (C) 2001-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
10
11 drbd is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2, or (at your option)
14 any later version.
15
16 drbd is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
20
21 You should have received a copy of the GNU General Public License
22 along with drbd; see the file COPYING. If not, write to
23 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24
25*/
26#ifndef DRBD_H
27#define DRBD_H
28#include <linux/connector.h>
29#include <asm/types.h>
30
31#ifdef __KERNEL__
32#include <linux/types.h>
33#include <asm/byteorder.h>
34#else
35#include <sys/types.h>
36#include <sys/wait.h>
37#include <limits.h>
38
39/* Altough the Linux source code makes a difference between
40 generic endianness and the bitfields' endianness, there is no
41 architecture as of Linux-2.6.24-rc4 where the bitfileds' endianness
42 does not match the generic endianness. */
43
44#if __BYTE_ORDER == __LITTLE_ENDIAN
45#define __LITTLE_ENDIAN_BITFIELD
46#elif __BYTE_ORDER == __BIG_ENDIAN
47#define __BIG_ENDIAN_BITFIELD
48#else
49# error "sorry, weird endianness on this box"
50#endif
51
52#endif
53
54
55extern const char *drbd_buildtag(void);
2ebccd71 56#define REL_VERSION "8.3.7"
b411b363
PR		 57#define API_VERSION 88
58#define PRO_VERSION_MIN 86
cf14c2e9 59#define PRO_VERSION_MAX 92
b411b363
PR		 60
61
62enum drbd_io_error_p {
63 EP_PASS_ON, /* FIXME should the better be named "Ignore"? */
64 EP_CALL_HELPER,
65 EP_DETACH
66};
67
68enum drbd_fencing_p {
69 FP_DONT_CARE,
70 FP_RESOURCE,
71 FP_STONITH
72};
73
74enum drbd_disconnect_p {
75 DP_RECONNECT,
76 DP_DROP_NET_CONF,
77 DP_FREEZE_IO
78};
79
80enum drbd_after_sb_p {
81 ASB_DISCONNECT,
82 ASB_DISCARD_YOUNGER_PRI,
83 ASB_DISCARD_OLDER_PRI,
84 ASB_DISCARD_ZERO_CHG,
85 ASB_DISCARD_LEAST_CHG,
86 ASB_DISCARD_LOCAL,
87 ASB_DISCARD_REMOTE,
88 ASB_CONSENSUS,
89 ASB_DISCARD_SECONDARY,
90 ASB_CALL_HELPER,
91 ASB_VIOLENTLY
92};
93
94/* KEEP the order, do not delete or insert. Only append. */
95enum drbd_ret_codes {
96 ERR_CODE_BASE = 100,
97 NO_ERROR = 101,
98 ERR_LOCAL_ADDR = 102,
99 ERR_PEER_ADDR = 103,
100 ERR_OPEN_DISK = 104,
101 ERR_OPEN_MD_DISK = 105,
102 ERR_DISK_NOT_BDEV = 107,
103 ERR_MD_NOT_BDEV = 108,
104 ERR_DISK_TO_SMALL = 111,
105 ERR_MD_DISK_TO_SMALL = 112,
106 ERR_BDCLAIM_DISK = 114,
107 ERR_BDCLAIM_MD_DISK = 115,
108 ERR_MD_IDX_INVALID = 116,
109 ERR_IO_MD_DISK = 118,
110 ERR_MD_INVALID = 119,
111 ERR_AUTH_ALG = 120,
112 ERR_AUTH_ALG_ND = 121,
113 ERR_NOMEM = 122,
114 ERR_DISCARD = 123,
115 ERR_DISK_CONFIGURED = 124,
116 ERR_NET_CONFIGURED = 125,
117 ERR_MANDATORY_TAG = 126,
118 ERR_MINOR_INVALID = 127,
119 ERR_INTR = 129, /* EINTR */
120 ERR_RESIZE_RESYNC = 130,
121 ERR_NO_PRIMARY = 131,
122 ERR_SYNC_AFTER = 132,
123 ERR_SYNC_AFTER_CYCLE = 133,
124 ERR_PAUSE_IS_SET = 134,
125 ERR_PAUSE_IS_CLEAR = 135,
126 ERR_PACKET_NR = 137,
127 ERR_NO_DISK = 138,
128 ERR_NOT_PROTO_C = 139,
129 ERR_NOMEM_BITMAP = 140,
130 ERR_INTEGRITY_ALG = 141, /* DRBD 8.2 only */
131 ERR_INTEGRITY_ALG_ND = 142, /* DRBD 8.2 only */
132 ERR_CPU_MASK_PARSE = 143, /* DRBD 8.2 only */
133 ERR_CSUMS_ALG = 144, /* DRBD 8.2 only */
134 ERR_CSUMS_ALG_ND = 145, /* DRBD 8.2 only */
135 ERR_VERIFY_ALG = 146, /* DRBD 8.2 only */
136 ERR_VERIFY_ALG_ND = 147, /* DRBD 8.2 only */
137 ERR_CSUMS_RESYNC_RUNNING= 148, /* DRBD 8.2 only */
138 ERR_VERIFY_RUNNING = 149, /* DRBD 8.2 only */
139 ERR_DATA_NOT_CURRENT = 150,
140 ERR_CONNECTED = 151, /* DRBD 8.3 only */
9f5180e5 141 ERR_PERM = 152,
b411b363
PR		 142
143 /* insert new ones above this line */
144 AFTER_LAST_ERR_CODE
145};
146
147#define DRBD_PROT_A 1
148#define DRBD_PROT_B 2
149#define DRBD_PROT_C 3
150
151enum drbd_role {
152 R_UNKNOWN = 0,
153 R_PRIMARY = 1, /* role */
154 R_SECONDARY = 2, /* role */
155 R_MASK = 3,
156};
157
158/* The order of these constants is important.
159 * The lower ones (<C_WF_REPORT_PARAMS) indicate
160 * that there is no socket!
161 * >=C_WF_REPORT_PARAMS ==> There is a socket
162 */
163enum drbd_conns {
164 C_STANDALONE,
165 C_DISCONNECTING, /* Temporal state on the way to StandAlone. */
166 C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */
167
168 /* These temporal states are all used on the way
169 * from >= C_CONNECTED to Unconnected.
170 * The 'disconnect reason' states
171 * I do not allow to change beween them. */
172 C_TIMEOUT,
173 C_BROKEN_PIPE,
174 C_NETWORK_FAILURE,
175 C_PROTOCOL_ERROR,
176 C_TEAR_DOWN,
177
178 C_WF_CONNECTION,
179 C_WF_REPORT_PARAMS, /* we have a socket */
180 C_CONNECTED, /* we have introduced each other */
181 C_STARTING_SYNC_S, /* starting full sync by admin request. */
182 C_STARTING_SYNC_T, /* stariing full sync by admin request. */
183 C_WF_BITMAP_S,
184 C_WF_BITMAP_T,
185 C_WF_SYNC_UUID,
186
187 /* All SyncStates are tested with this comparison
188 * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */
189 C_SYNC_SOURCE,
190 C_SYNC_TARGET,
191 C_VERIFY_S,
192 C_VERIFY_T,
193 C_PAUSED_SYNC_S,
194 C_PAUSED_SYNC_T,
195 C_MASK = 31
196};
197
198enum drbd_disk_state {
199 D_DISKLESS,
200 D_ATTACHING, /* In the process of reading the meta-data */
201 D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */
202 /* when >= D_FAILED it is legal to access mdev->bc */
203 D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */
204 D_INCONSISTENT,
205 D_OUTDATED,
206 D_UNKNOWN, /* Only used for the peer, never for myself */
207 D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */
208 D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */
209 D_MASK = 15
210};
211
212union drbd_state {
213/* According to gcc's docs is the ...
214 * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1).
215 * Determined by ABI.
216 * pointed out by Maxim Uvarov q<muvarov@ru.mvista.com>
217 * even though we transmit as "cpu_to_be32(state)",
218 * the offsets of the bitfields still need to be swapped
219 * on different endianess.
220 */
221 struct {
222#if defined(__LITTLE_ENDIAN_BITFIELD)
223 unsigned role:2 ; /* 3/4 primary/secondary/unknown */
224 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
225 unsigned conn:5 ; /* 17/32 cstates */
226 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
227 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
228 unsigned susp:1 ; /* 2/2 IO suspended no/yes */
229 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
230 unsigned peer_isp:1 ;
231 unsigned user_isp:1 ;
232 unsigned _pad:11; /* 0 unused */
233#elif defined(__BIG_ENDIAN_BITFIELD)
234 unsigned _pad:11; /* 0 unused */
235 unsigned user_isp:1 ;
236 unsigned peer_isp:1 ;
237 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
238 unsigned susp:1 ; /* 2/2 IO suspended no/yes */
239 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
240 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
241 unsigned conn:5 ; /* 17/32 cstates */
242 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
243 unsigned role:2 ; /* 3/4 primary/secondary/unknown */
244#else
245# error "this endianess is not supported"
246#endif
247 };
248 unsigned int i;
249};
250
251enum drbd_state_ret_codes {
252 SS_CW_NO_NEED = 4,
253 SS_CW_SUCCESS = 3,
254 SS_NOTHING_TO_DO = 2,
255 SS_SUCCESS = 1,
256 SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */
257 SS_TWO_PRIMARIES = -1,
258 SS_NO_UP_TO_DATE_DISK = -2,
259 SS_NO_LOCAL_DISK = -4,
260 SS_NO_REMOTE_DISK = -5,
261 SS_CONNECTED_OUTDATES = -6,
262 SS_PRIMARY_NOP = -7,
263 SS_RESYNC_RUNNING = -8,
264 SS_ALREADY_STANDALONE = -9,
265 SS_CW_FAILED_BY_PEER = -10,
266 SS_IS_DISKLESS = -11,
267 SS_DEVICE_IN_USE = -12,
268 SS_NO_NET_CONFIG = -13,
269 SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */
270 SS_NEED_CONNECTION = -15, /* drbd-8.2 only */
271 SS_LOWER_THAN_OUTDATED = -16,
272 SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */
273 SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */
274 SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */
275 SS_AFTER_LAST_ERROR = -20, /* Keep this at bottom */
276};
277
278/* from drbd_strings.c */
279extern const char *drbd_conn_str(enum drbd_conns);
280extern const char *drbd_role_str(enum drbd_role);
281extern const char *drbd_disk_str(enum drbd_disk_state);
282extern const char *drbd_set_st_err_str(enum drbd_state_ret_codes);
283
284#define SHARED_SECRET_MAX 64
285
286#define MDF_CONSISTENT (1 << 0)
287#define MDF_PRIMARY_IND (1 << 1)
288#define MDF_CONNECTED_IND (1 << 2)
289#define MDF_FULL_SYNC (1 << 3)
290#define MDF_WAS_UP_TO_DATE (1 << 4)
291#define MDF_PEER_OUT_DATED (1 << 5)
292#define MDF_CRASHED_PRIMARY (1 << 6)
293
294enum drbd_uuid_index {
295 UI_CURRENT,
296 UI_BITMAP,
297 UI_HISTORY_START,
298 UI_HISTORY_END,
299 UI_SIZE, /* nl-packet: number of dirty bits */
300 UI_FLAGS, /* nl-packet: flags */
301 UI_EXTENDED_SIZE /* Everything. */
302};
303
304enum drbd_timeout_flag {
305 UT_DEFAULT = 0,
306 UT_DEGRADED = 1,
307 UT_PEER_OUTDATED = 2,
308};
309
310#define UUID_JUST_CREATED ((__u64)4)
311
312#define DRBD_MAGIC 0x83740267
313#define BE_DRBD_MAGIC __constant_cpu_to_be32(DRBD_MAGIC)
314
315/* these are of type "int" */
316#define DRBD_MD_INDEX_INTERNAL -1
317#define DRBD_MD_INDEX_FLEX_EXT -2
318#define DRBD_MD_INDEX_FLEX_INT -3
319
320/* Start of the new netlink/connector stuff */
321
322#define DRBD_NL_CREATE_DEVICE 0x01
323#define DRBD_NL_SET_DEFAULTS 0x02
324
b411b363
PR		 325
326/* For searching a vacant cn_idx value */
327#define CN_IDX_STEP 6977
328
329struct drbd_nl_cfg_req {
330 int packet_type;
331 unsigned int drbd_minor;
332 int flags;
333 unsigned short tag_list[];
334};
335
336struct drbd_nl_cfg_reply {
337 int packet_type;
338 unsigned int minor;
339 int ret_code; /* enum ret_code or set_st_err_t */
340 unsigned short tag_list[]; /* only used with get_* calls */
341};
342
343#endif
Linux 6.x block layer and io_uring tree(s)