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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/linux/drbd.h
3 Kernel module for 2.6.x Kernels
5 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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>.
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)
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.
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.
28 #include <linux/connector.h>
29 #include <asm/types.h>
32 #include <linux/types.h>
33 #include <asm/byteorder.h>
35 #include <sys/types.h>
39 /* Although 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 bitfields' endianness
42 does not match the generic endianness. */
44 #if __BYTE_ORDER == __LITTLE_ENDIAN
45 #define __LITTLE_ENDIAN_BITFIELD
46 #elif __BYTE_ORDER == __BIG_ENDIAN
47 #define __BIG_ENDIAN_BITFIELD
49 # error "sorry, weird endianness on this box"
54 extern const char *drbd_buildtag(void);
55 #define REL_VERSION "8.4.2"
57 #define PRO_VERSION_MIN 86
58 #define PRO_VERSION_MAX 101
61 enum drbd_io_error_p
{
62 EP_PASS_ON
, /* FIXME should the better be named "Ignore"? */
68 FP_NOT_AVAIL
= -1, /* Not a policy */
74 enum drbd_disconnect_p
{
80 enum drbd_after_sb_p
{
82 ASB_DISCARD_YOUNGER_PRI
,
83 ASB_DISCARD_OLDER_PRI
,
85 ASB_DISCARD_LEAST_CHG
,
89 ASB_DISCARD_SECONDARY
,
94 enum drbd_on_no_data
{
99 enum drbd_on_congestion
{
105 enum drbd_read_balancing
{
119 /* KEEP the order, do not delete or insert. Only append. */
123 ERR_LOCAL_ADDR
= 102,
126 ERR_OPEN_MD_DISK
= 105,
127 ERR_DISK_NOT_BDEV
= 107,
128 ERR_MD_NOT_BDEV
= 108,
129 ERR_DISK_TOO_SMALL
= 111,
130 ERR_MD_DISK_TOO_SMALL
= 112,
131 ERR_BDCLAIM_DISK
= 114,
132 ERR_BDCLAIM_MD_DISK
= 115,
133 ERR_MD_IDX_INVALID
= 116,
134 ERR_IO_MD_DISK
= 118,
135 ERR_MD_INVALID
= 119,
137 ERR_AUTH_ALG_ND
= 121,
139 ERR_DISCARD_IMPOSSIBLE
= 123,
140 ERR_DISK_CONFIGURED
= 124,
141 ERR_NET_CONFIGURED
= 125,
142 ERR_MANDATORY_TAG
= 126,
143 ERR_MINOR_INVALID
= 127,
144 ERR_INTR
= 129, /* EINTR */
145 ERR_RESIZE_RESYNC
= 130,
146 ERR_NO_PRIMARY
= 131,
147 ERR_RESYNC_AFTER
= 132,
148 ERR_RESYNC_AFTER_CYCLE
= 133,
149 ERR_PAUSE_IS_SET
= 134,
150 ERR_PAUSE_IS_CLEAR
= 135,
153 ERR_NOT_PROTO_C
= 139,
154 ERR_NOMEM_BITMAP
= 140,
155 ERR_INTEGRITY_ALG
= 141, /* DRBD 8.2 only */
156 ERR_INTEGRITY_ALG_ND
= 142, /* DRBD 8.2 only */
157 ERR_CPU_MASK_PARSE
= 143, /* DRBD 8.2 only */
158 ERR_CSUMS_ALG
= 144, /* DRBD 8.2 only */
159 ERR_CSUMS_ALG_ND
= 145, /* DRBD 8.2 only */
160 ERR_VERIFY_ALG
= 146, /* DRBD 8.2 only */
161 ERR_VERIFY_ALG_ND
= 147, /* DRBD 8.2 only */
162 ERR_CSUMS_RESYNC_RUNNING
= 148, /* DRBD 8.2 only */
163 ERR_VERIFY_RUNNING
= 149, /* DRBD 8.2 only */
164 ERR_DATA_NOT_CURRENT
= 150,
165 ERR_CONNECTED
= 151, /* DRBD 8.3 only */
167 ERR_NEED_APV_93
= 153,
168 ERR_STONITH_AND_PROT_A
= 154,
169 ERR_CONG_NOT_PROTO_A
= 155,
170 ERR_PIC_AFTER_DEP
= 156,
171 ERR_PIC_PEER_DEP
= 157,
172 ERR_RES_NOT_KNOWN
= 158,
173 ERR_RES_IN_USE
= 159,
174 ERR_MINOR_CONFIGURED
= 160,
175 ERR_MINOR_EXISTS
= 161,
176 ERR_INVALID_REQUEST
= 162,
177 ERR_NEED_APV_100
= 163,
178 ERR_NEED_ALLOW_TWO_PRI
= 164,
179 ERR_MD_UNCLEAN
= 165,
181 /* insert new ones above this line */
185 #define DRBD_PROT_A 1
186 #define DRBD_PROT_B 2
187 #define DRBD_PROT_C 3
191 R_PRIMARY
= 1, /* role */
192 R_SECONDARY
= 2, /* role */
196 /* The order of these constants is important.
197 * The lower ones (<C_WF_REPORT_PARAMS) indicate
198 * that there is no socket!
199 * >=C_WF_REPORT_PARAMS ==> There is a socket
203 C_DISCONNECTING
, /* Temporal state on the way to StandAlone. */
204 C_UNCONNECTED
, /* >= C_UNCONNECTED -> inc_net() succeeds */
206 /* These temporal states are all used on the way
207 * from >= C_CONNECTED to Unconnected.
208 * The 'disconnect reason' states
209 * I do not allow to change between them. */
217 C_WF_REPORT_PARAMS
, /* we have a socket */
218 C_CONNECTED
, /* we have introduced each other */
219 C_STARTING_SYNC_S
, /* starting full sync by admin request. */
220 C_STARTING_SYNC_T
, /* starting full sync by admin request. */
225 /* All SyncStates are tested with this comparison
226 * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */
240 enum drbd_disk_state
{
242 D_ATTACHING
, /* In the process of reading the meta-data */
243 D_FAILED
, /* Becomes D_DISKLESS as soon as we told it the peer */
244 /* when >= D_FAILED it is legal to access mdev->bc */
245 D_NEGOTIATING
, /* Late attaching state, we need to talk to the peer */
248 D_UNKNOWN
, /* Only used for the peer, never for myself */
249 D_CONSISTENT
, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */
250 D_UP_TO_DATE
, /* Only this disk state allows applications' IO ! */
255 /* According to gcc's docs is the ...
256 * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1).
258 * pointed out by Maxim Uvarov q<muvarov@ru.mvista.com>
259 * even though we transmit as "cpu_to_be32(state)",
260 * the offsets of the bitfields still need to be swapped
261 * on different endianness.
264 #if defined(__LITTLE_ENDIAN_BITFIELD)
265 unsigned role
:2 ; /* 3/4 primary/secondary/unknown */
266 unsigned peer
:2 ; /* 3/4 primary/secondary/unknown */
267 unsigned conn
:5 ; /* 17/32 cstates */
268 unsigned disk
:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
269 unsigned pdsk
:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
270 unsigned susp
:1 ; /* 2/2 IO suspended no/yes (by user) */
271 unsigned aftr_isp
:1 ; /* isp .. imposed sync pause */
272 unsigned peer_isp
:1 ;
273 unsigned user_isp
:1 ;
274 unsigned susp_nod
:1 ; /* IO suspended because no data */
275 unsigned susp_fen
:1 ; /* IO suspended because fence peer handler runs*/
276 unsigned _pad
:9; /* 0 unused */
277 #elif defined(__BIG_ENDIAN_BITFIELD)
279 unsigned susp_fen
:1 ;
280 unsigned susp_nod
:1 ;
281 unsigned user_isp
:1 ;
282 unsigned peer_isp
:1 ;
283 unsigned aftr_isp
:1 ; /* isp .. imposed sync pause */
284 unsigned susp
:1 ; /* 2/2 IO suspended no/yes */
285 unsigned pdsk
:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
286 unsigned disk
:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
287 unsigned conn
:5 ; /* 17/32 cstates */
288 unsigned peer
:2 ; /* 3/4 primary/secondary/unknown */
289 unsigned role
:2 ; /* 3/4 primary/secondary/unknown */
291 # error "this endianness is not supported"
300 SS_NOTHING_TO_DO
= 2,
302 SS_UNKNOWN_ERROR
= 0, /* Used to sleep longer in _drbd_request_state */
303 SS_TWO_PRIMARIES
= -1,
304 SS_NO_UP_TO_DATE_DISK
= -2,
305 SS_NO_LOCAL_DISK
= -4,
306 SS_NO_REMOTE_DISK
= -5,
307 SS_CONNECTED_OUTDATES
= -6,
309 SS_RESYNC_RUNNING
= -8,
310 SS_ALREADY_STANDALONE
= -9,
311 SS_CW_FAILED_BY_PEER
= -10,
312 SS_IS_DISKLESS
= -11,
313 SS_DEVICE_IN_USE
= -12,
314 SS_NO_NET_CONFIG
= -13,
315 SS_NO_VERIFY_ALG
= -14, /* drbd-8.2 only */
316 SS_NEED_CONNECTION
= -15, /* drbd-8.2 only */
317 SS_LOWER_THAN_OUTDATED
= -16,
318 SS_NOT_SUPPORTED
= -17, /* drbd-8.2 only */
319 SS_IN_TRANSIENT_STATE
= -18, /* Retry after the next state change */
320 SS_CONCURRENT_ST_CHG
= -19, /* Concurrent cluster side state change! */
321 SS_O_VOL_PEER_PRI
= -20,
322 SS_AFTER_LAST_ERROR
= -21, /* Keep this at bottom */
325 /* from drbd_strings.c */
326 extern const char *drbd_conn_str(enum drbd_conns
);
327 extern const char *drbd_role_str(enum drbd_role
);
328 extern const char *drbd_disk_str(enum drbd_disk_state
);
329 extern const char *drbd_set_st_err_str(enum drbd_state_rv
);
331 #define SHARED_SECRET_MAX 64
333 #define MDF_CONSISTENT (1 << 0)
334 #define MDF_PRIMARY_IND (1 << 1)
335 #define MDF_CONNECTED_IND (1 << 2)
336 #define MDF_FULL_SYNC (1 << 3)
337 #define MDF_WAS_UP_TO_DATE (1 << 4)
338 #define MDF_PEER_OUT_DATED (1 << 5)
339 #define MDF_CRASHED_PRIMARY (1 << 6)
340 #define MDF_AL_CLEAN (1 << 7)
341 #define MDF_AL_DISABLED (1 << 8)
343 enum drbd_uuid_index
{
348 UI_SIZE
, /* nl-packet: number of dirty bits */
349 UI_FLAGS
, /* nl-packet: flags */
350 UI_EXTENDED_SIZE
/* Everything. */
353 enum drbd_timeout_flag
{
356 UT_PEER_OUTDATED
= 2,
359 #define UUID_JUST_CREATED ((__u64)4)
361 /* magic numbers used in meta data and network packets */
362 #define DRBD_MAGIC 0x83740267
363 #define DRBD_MAGIC_BIG 0x835a
364 #define DRBD_MAGIC_100 0x8620ec20
366 #define DRBD_MD_MAGIC_07 (DRBD_MAGIC+3)
367 #define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4)
368 #define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5)
371 /* how I came up with this magic?
372 * base64 decode "actlog==" ;) */
373 #define DRBD_AL_MAGIC 0x69cb65a2
375 /* these are of type "int" */
376 #define DRBD_MD_INDEX_INTERNAL -1
377 #define DRBD_MD_INDEX_FLEX_EXT -2
378 #define DRBD_MD_INDEX_FLEX_INT -3