1 /* SPDX-License-Identifier: GPL-2.0-or-later */
4 Kernel module for 2.6.x Kernels
6 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
8 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
9 Copyright (C) 2001-2008, Philipp Reisner <philipp.reisner@linbit.com>.
10 Copyright (C) 2001-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
16 #include <asm/types.h>
19 #include <linux/types.h>
20 #include <asm/byteorder.h>
22 #include <sys/types.h>
26 /* Although the Linux source code makes a difference between
27 generic endianness and the bitfields' endianness, there is no
28 architecture as of Linux-2.6.24-rc4 where the bitfields' endianness
29 does not match the generic endianness. */
31 #if __BYTE_ORDER == __LITTLE_ENDIAN
32 #define __LITTLE_ENDIAN_BITFIELD
33 #elif __BYTE_ORDER == __BIG_ENDIAN
34 #define __BIG_ENDIAN_BITFIELD
36 # error "sorry, weird endianness on this box"
41 extern const char *drbd_buildtag(void);
42 #define REL_VERSION "8.4.11"
44 #define PRO_VERSION_MIN 86
45 #define PRO_VERSION_MAX 101
48 enum drbd_io_error_p {
49 EP_PASS_ON, /* FIXME should the better be named "Ignore"? */
55 FP_NOT_AVAIL = -1, /* Not a policy */
61 enum drbd_disconnect_p {
67 enum drbd_after_sb_p {
69 ASB_DISCARD_YOUNGER_PRI,
70 ASB_DISCARD_OLDER_PRI,
72 ASB_DISCARD_LEAST_CHG,
76 ASB_DISCARD_SECONDARY,
81 enum drbd_on_no_data {
86 enum drbd_on_congestion {
92 enum drbd_read_balancing {
106 /* KEEP the order, do not delete or insert. Only append. */
110 ERR_LOCAL_ADDR = 102,
113 ERR_OPEN_MD_DISK = 105,
114 ERR_DISK_NOT_BDEV = 107,
115 ERR_MD_NOT_BDEV = 108,
116 ERR_DISK_TOO_SMALL = 111,
117 ERR_MD_DISK_TOO_SMALL = 112,
118 ERR_BDCLAIM_DISK = 114,
119 ERR_BDCLAIM_MD_DISK = 115,
120 ERR_MD_IDX_INVALID = 116,
121 ERR_IO_MD_DISK = 118,
122 ERR_MD_INVALID = 119,
124 ERR_AUTH_ALG_ND = 121,
126 ERR_DISCARD_IMPOSSIBLE = 123,
127 ERR_DISK_CONFIGURED = 124,
128 ERR_NET_CONFIGURED = 125,
129 ERR_MANDATORY_TAG = 126,
130 ERR_MINOR_INVALID = 127,
131 ERR_INTR = 129, /* EINTR */
132 ERR_RESIZE_RESYNC = 130,
133 ERR_NO_PRIMARY = 131,
134 ERR_RESYNC_AFTER = 132,
135 ERR_RESYNC_AFTER_CYCLE = 133,
136 ERR_PAUSE_IS_SET = 134,
137 ERR_PAUSE_IS_CLEAR = 135,
140 ERR_NOT_PROTO_C = 139,
141 ERR_NOMEM_BITMAP = 140,
142 ERR_INTEGRITY_ALG = 141, /* DRBD 8.2 only */
143 ERR_INTEGRITY_ALG_ND = 142, /* DRBD 8.2 only */
144 ERR_CPU_MASK_PARSE = 143, /* DRBD 8.2 only */
145 ERR_CSUMS_ALG = 144, /* DRBD 8.2 only */
146 ERR_CSUMS_ALG_ND = 145, /* DRBD 8.2 only */
147 ERR_VERIFY_ALG = 146, /* DRBD 8.2 only */
148 ERR_VERIFY_ALG_ND = 147, /* DRBD 8.2 only */
149 ERR_CSUMS_RESYNC_RUNNING= 148, /* DRBD 8.2 only */
150 ERR_VERIFY_RUNNING = 149, /* DRBD 8.2 only */
151 ERR_DATA_NOT_CURRENT = 150,
152 ERR_CONNECTED = 151, /* DRBD 8.3 only */
154 ERR_NEED_APV_93 = 153,
155 ERR_STONITH_AND_PROT_A = 154,
156 ERR_CONG_NOT_PROTO_A = 155,
157 ERR_PIC_AFTER_DEP = 156,
158 ERR_PIC_PEER_DEP = 157,
159 ERR_RES_NOT_KNOWN = 158,
160 ERR_RES_IN_USE = 159,
161 ERR_MINOR_CONFIGURED = 160,
162 ERR_MINOR_OR_VOLUME_EXISTS = 161,
163 ERR_INVALID_REQUEST = 162,
164 ERR_NEED_APV_100 = 163,
165 ERR_NEED_ALLOW_TWO_PRI = 164,
166 ERR_MD_UNCLEAN = 165,
167 ERR_MD_LAYOUT_CONNECTED = 166,
168 ERR_MD_LAYOUT_TOO_BIG = 167,
169 ERR_MD_LAYOUT_TOO_SMALL = 168,
170 ERR_MD_LAYOUT_NO_FIT = 169,
171 ERR_IMPLICIT_SHRINK = 170,
172 /* insert new ones above this line */
176 #define DRBD_PROT_A 1
177 #define DRBD_PROT_B 2
178 #define DRBD_PROT_C 3
182 R_PRIMARY = 1, /* role */
183 R_SECONDARY = 2, /* role */
187 /* The order of these constants is important.
188 * The lower ones (<C_WF_REPORT_PARAMS) indicate
189 * that there is no socket!
190 * >=C_WF_REPORT_PARAMS ==> There is a socket
194 C_DISCONNECTING, /* Temporal state on the way to StandAlone. */
195 C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */
197 /* These temporal states are all used on the way
198 * from >= C_CONNECTED to Unconnected.
199 * The 'disconnect reason' states
200 * I do not allow to change between them. */
208 C_WF_REPORT_PARAMS, /* we have a socket */
209 C_CONNECTED, /* we have introduced each other */
210 C_STARTING_SYNC_S, /* starting full sync by admin request. */
211 C_STARTING_SYNC_T, /* starting full sync by admin request. */
216 /* All SyncStates are tested with this comparison
217 * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */
231 enum drbd_disk_state {
233 D_ATTACHING, /* In the process of reading the meta-data */
234 D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */
235 /* when >= D_FAILED it is legal to access mdev->ldev */
236 D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */
239 D_UNKNOWN, /* Only used for the peer, never for myself */
240 D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */
241 D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */
246 /* According to gcc's docs is the ...
247 * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1).
249 * pointed out by Maxim Uvarov q<muvarov@ru.mvista.com>
250 * even though we transmit as "cpu_to_be32(state)",
251 * the offsets of the bitfields still need to be swapped
252 * on different endianness.
255 #if defined(__LITTLE_ENDIAN_BITFIELD)
256 unsigned role:2 ; /* 3/4 primary/secondary/unknown */
257 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
258 unsigned conn:5 ; /* 17/32 cstates */
259 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
260 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
261 unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */
262 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
263 unsigned peer_isp:1 ;
264 unsigned user_isp:1 ;
265 unsigned susp_nod:1 ; /* IO suspended because no data */
266 unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/
267 unsigned _pad:9; /* 0 unused */
268 #elif defined(__BIG_ENDIAN_BITFIELD)
270 unsigned susp_fen:1 ;
271 unsigned susp_nod:1 ;
272 unsigned user_isp:1 ;
273 unsigned peer_isp:1 ;
274 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
275 unsigned susp:1 ; /* 2/2 IO suspended no/yes */
276 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
277 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
278 unsigned conn:5 ; /* 17/32 cstates */
279 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
280 unsigned role:2 ; /* 3/4 primary/secondary/unknown */
282 # error "this endianness is not supported"
291 SS_NOTHING_TO_DO = 2,
293 SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */
294 SS_TWO_PRIMARIES = -1,
295 SS_NO_UP_TO_DATE_DISK = -2,
296 SS_NO_LOCAL_DISK = -4,
297 SS_NO_REMOTE_DISK = -5,
298 SS_CONNECTED_OUTDATES = -6,
300 SS_RESYNC_RUNNING = -8,
301 SS_ALREADY_STANDALONE = -9,
302 SS_CW_FAILED_BY_PEER = -10,
303 SS_IS_DISKLESS = -11,
304 SS_DEVICE_IN_USE = -12,
305 SS_NO_NET_CONFIG = -13,
306 SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */
307 SS_NEED_CONNECTION = -15, /* drbd-8.2 only */
308 SS_LOWER_THAN_OUTDATED = -16,
309 SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */
310 SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */
311 SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */
312 SS_O_VOL_PEER_PRI = -20,
313 SS_OUTDATE_WO_CONN = -21,
314 SS_AFTER_LAST_ERROR = -22, /* Keep this at bottom */
317 #define SHARED_SECRET_MAX 64
319 #define MDF_CONSISTENT (1 << 0)
320 #define MDF_PRIMARY_IND (1 << 1)
321 #define MDF_CONNECTED_IND (1 << 2)
322 #define MDF_FULL_SYNC (1 << 3)
323 #define MDF_WAS_UP_TO_DATE (1 << 4)
324 #define MDF_PEER_OUT_DATED (1 << 5)
325 #define MDF_CRASHED_PRIMARY (1 << 6)
326 #define MDF_AL_CLEAN (1 << 7)
327 #define MDF_AL_DISABLED (1 << 8)
331 enum drbd_uuid_index {
336 UI_SIZE, /* nl-packet: number of dirty bits */
337 UI_FLAGS, /* nl-packet: flags */
338 UI_EXTENDED_SIZE /* Everything. */
341 #define HISTORY_UUIDS MAX_PEERS
343 enum drbd_timeout_flag {
346 UT_PEER_OUTDATED = 2,
349 enum drbd_notification_type {
357 NOTIFY_CONTINUES = 0x8000,
358 NOTIFY_FLAGS = NOTIFY_CONTINUES,
361 enum drbd_peer_state {
369 #define UUID_JUST_CREATED ((__u64)4)
371 enum write_ordering_e {
378 /* magic numbers used in meta data and network packets */
379 #define DRBD_MAGIC 0x83740267
380 #define DRBD_MAGIC_BIG 0x835a
381 #define DRBD_MAGIC_100 0x8620ec20
383 #define DRBD_MD_MAGIC_07 (DRBD_MAGIC+3)
384 #define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4)
385 #define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5)
388 /* how I came up with this magic?
389 * base64 decode "actlog==" ;) */
390 #define DRBD_AL_MAGIC 0x69cb65a2
392 /* these are of type "int" */
393 #define DRBD_MD_INDEX_INTERNAL -1
394 #define DRBD_MD_INDEX_FLEX_EXT -2
395 #define DRBD_MD_INDEX_FLEX_INT -3
397 #define DRBD_CPU_MASK_SIZE 32