Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | drbd_int.h |
| 3 | |
| 4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
| 5 | |
| 6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. |
| 7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. |
| 8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. |
| 9 | |
| 10 | drbd is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2, or (at your option) |
| 13 | any later version. |
| 14 | |
| 15 | drbd is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with drbd; see the file COPYING. If not, write to |
| 22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 | |
| 24 | */ |
| 25 | |
| 26 | #ifndef _DRBD_INT_H |
| 27 | #define _DRBD_INT_H |
| 28 | |
| 29 | #include <linux/compiler.h> |
| 30 | #include <linux/types.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 31 | #include <linux/list.h> |
| 32 | #include <linux/sched.h> |
| 33 | #include <linux/bitops.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/crypto.h> |
Randy Dunlap | 132cc53 | 2009-10-07 19:26:00 +0200 | [diff] [blame] | 36 | #include <linux/ratelimit.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 37 | #include <linux/tcp.h> |
| 38 | #include <linux/mutex.h> |
| 39 | #include <linux/major.h> |
| 40 | #include <linux/blkdev.h> |
| 41 | #include <linux/genhd.h> |
| 42 | #include <net/tcp.h> |
| 43 | #include <linux/lru_cache.h> |
Paul Gortmaker | 70c7160 | 2011-05-22 16:47:17 -0400 | [diff] [blame] | 44 | #include <linux/prefetch.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 45 | |
| 46 | #ifdef __CHECKER__ |
| 47 | # define __protected_by(x) __attribute__((require_context(x,1,999,"rdwr"))) |
| 48 | # define __protected_read_by(x) __attribute__((require_context(x,1,999,"read"))) |
| 49 | # define __protected_write_by(x) __attribute__((require_context(x,1,999,"write"))) |
| 50 | # define __must_hold(x) __attribute__((context(x,1,1), require_context(x,1,999,"call"))) |
| 51 | #else |
| 52 | # define __protected_by(x) |
| 53 | # define __protected_read_by(x) |
| 54 | # define __protected_write_by(x) |
| 55 | # define __must_hold(x) |
| 56 | #endif |
| 57 | |
| 58 | #define __no_warn(lock, stmt) do { __acquire(lock); stmt; __release(lock); } while (0) |
| 59 | |
| 60 | /* module parameter, defined in drbd_main.c */ |
| 61 | extern unsigned int minor_count; |
Rusty Russell | 90ab5ee | 2012-01-13 09:32:20 +1030 | [diff] [blame] | 62 | extern bool disable_sendpage; |
| 63 | extern bool allow_oos; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 64 | extern unsigned int cn_idx; |
| 65 | |
| 66 | #ifdef CONFIG_DRBD_FAULT_INJECTION |
| 67 | extern int enable_faults; |
| 68 | extern int fault_rate; |
| 69 | extern int fault_devs; |
| 70 | #endif |
| 71 | |
| 72 | extern char usermode_helper[]; |
| 73 | |
| 74 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 75 | /* I don't remember why XCPU ... |
| 76 | * This is used to wake the asender, |
| 77 | * and to interrupt sending the sending task |
| 78 | * on disconnect. |
| 79 | */ |
| 80 | #define DRBD_SIG SIGXCPU |
| 81 | |
| 82 | /* This is used to stop/restart our threads. |
| 83 | * Cannot use SIGTERM nor SIGKILL, since these |
| 84 | * are sent out by init on runlevel changes |
| 85 | * I choose SIGHUP for now. |
| 86 | */ |
| 87 | #define DRBD_SIGKILL SIGHUP |
| 88 | |
| 89 | /* All EEs on the free list should have ID_VACANT (== 0) |
| 90 | * freshly allocated EEs get !ID_VACANT (== 1) |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 91 | * so if it says "cannot dereference null pointer at address 0x00000001", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 92 | * it is most likely one of these :( */ |
| 93 | |
| 94 | #define ID_IN_SYNC (4711ULL) |
| 95 | #define ID_OUT_OF_SYNC (4712ULL) |
| 96 | |
| 97 | #define ID_SYNCER (-1ULL) |
| 98 | #define ID_VACANT 0 |
| 99 | #define is_syncer_block_id(id) ((id) == ID_SYNCER) |
Philipp Reisner | 4a23f26 | 2011-01-11 17:42:17 +0100 | [diff] [blame] | 100 | #define UUID_NEW_BM_OFFSET ((u64)0x0001000000000000ULL) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 101 | |
| 102 | struct drbd_conf; |
| 103 | |
| 104 | |
| 105 | /* to shorten dev_warn(DEV, "msg"); and relatives statements */ |
| 106 | #define DEV (disk_to_dev(mdev->vdisk)) |
| 107 | |
| 108 | #define D_ASSERT(exp) if (!(exp)) \ |
| 109 | dev_err(DEV, "ASSERT( " #exp " ) in %s:%d\n", __FILE__, __LINE__) |
| 110 | |
Lars Ellenberg | 3beec1d | 2010-10-14 13:31:48 +0200 | [diff] [blame] | 111 | #define ERR_IF(exp) if (({ \ |
| 112 | int _b = (exp) != 0; \ |
| 113 | if (_b) dev_err(DEV, "ASSERT FAILED: %s: (%s) in %s:%d\n", \ |
| 114 | __func__, #exp, __FILE__, __LINE__); \ |
| 115 | _b; \ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 116 | })) |
| 117 | |
| 118 | /* Defines to control fault insertion */ |
| 119 | enum { |
| 120 | DRBD_FAULT_MD_WR = 0, /* meta data write */ |
| 121 | DRBD_FAULT_MD_RD = 1, /* read */ |
| 122 | DRBD_FAULT_RS_WR = 2, /* resync */ |
| 123 | DRBD_FAULT_RS_RD = 3, |
| 124 | DRBD_FAULT_DT_WR = 4, /* data */ |
| 125 | DRBD_FAULT_DT_RD = 5, |
| 126 | DRBD_FAULT_DT_RA = 6, /* data read ahead */ |
| 127 | DRBD_FAULT_BM_ALLOC = 7, /* bitmap allocation */ |
| 128 | DRBD_FAULT_AL_EE = 8, /* alloc ee */ |
Philipp Reisner | 6b4388a | 2010-04-26 14:11:45 +0200 | [diff] [blame] | 129 | DRBD_FAULT_RECEIVE = 9, /* Changes some bytes upon receiving a [rs]data block */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 130 | |
| 131 | DRBD_FAULT_MAX, |
| 132 | }; |
| 133 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 134 | extern unsigned int |
| 135 | _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type); |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 136 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 137 | static inline int |
| 138 | drbd_insert_fault(struct drbd_conf *mdev, unsigned int type) { |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 139 | #ifdef CONFIG_DRBD_FAULT_INJECTION |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 140 | return fault_rate && |
| 141 | (enable_faults & (1<<type)) && |
| 142 | _drbd_insert_fault(mdev, type); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 143 | #else |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 144 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 145 | #endif |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 146 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 147 | |
| 148 | /* integer division, round _UP_ to the next integer */ |
| 149 | #define div_ceil(A, B) ((A)/(B) + ((A)%(B) ? 1 : 0)) |
| 150 | /* usual integer division */ |
| 151 | #define div_floor(A, B) ((A)/(B)) |
| 152 | |
| 153 | /* drbd_meta-data.c (still in drbd_main.c) */ |
| 154 | /* 4th incarnation of the disk layout. */ |
| 155 | #define DRBD_MD_MAGIC (DRBD_MAGIC+4) |
| 156 | |
| 157 | extern struct drbd_conf **minor_table; |
| 158 | extern struct ratelimit_state drbd_ratelimit_state; |
| 159 | |
| 160 | /* on the wire */ |
| 161 | enum drbd_packets { |
| 162 | /* receiver (data socket) */ |
| 163 | P_DATA = 0x00, |
| 164 | P_DATA_REPLY = 0x01, /* Response to P_DATA_REQUEST */ |
| 165 | P_RS_DATA_REPLY = 0x02, /* Response to P_RS_DATA_REQUEST */ |
| 166 | P_BARRIER = 0x03, |
| 167 | P_BITMAP = 0x04, |
| 168 | P_BECOME_SYNC_TARGET = 0x05, |
| 169 | P_BECOME_SYNC_SOURCE = 0x06, |
| 170 | P_UNPLUG_REMOTE = 0x07, /* Used at various times to hint the peer */ |
| 171 | P_DATA_REQUEST = 0x08, /* Used to ask for a data block */ |
| 172 | P_RS_DATA_REQUEST = 0x09, /* Used to ask for a data block for resync */ |
| 173 | P_SYNC_PARAM = 0x0a, |
| 174 | P_PROTOCOL = 0x0b, |
| 175 | P_UUIDS = 0x0c, |
| 176 | P_SIZES = 0x0d, |
| 177 | P_STATE = 0x0e, |
| 178 | P_SYNC_UUID = 0x0f, |
| 179 | P_AUTH_CHALLENGE = 0x10, |
| 180 | P_AUTH_RESPONSE = 0x11, |
| 181 | P_STATE_CHG_REQ = 0x12, |
| 182 | |
| 183 | /* asender (meta socket */ |
| 184 | P_PING = 0x13, |
| 185 | P_PING_ACK = 0x14, |
| 186 | P_RECV_ACK = 0x15, /* Used in protocol B */ |
| 187 | P_WRITE_ACK = 0x16, /* Used in protocol C */ |
| 188 | P_RS_WRITE_ACK = 0x17, /* Is a P_WRITE_ACK, additionally call set_in_sync(). */ |
| 189 | P_DISCARD_ACK = 0x18, /* Used in proto C, two-primaries conflict detection */ |
| 190 | P_NEG_ACK = 0x19, /* Sent if local disk is unusable */ |
| 191 | P_NEG_DREPLY = 0x1a, /* Local disk is broken... */ |
| 192 | P_NEG_RS_DREPLY = 0x1b, /* Local disk is broken... */ |
| 193 | P_BARRIER_ACK = 0x1c, |
| 194 | P_STATE_CHG_REPLY = 0x1d, |
| 195 | |
| 196 | /* "new" commands, no longer fitting into the ordering scheme above */ |
| 197 | |
| 198 | P_OV_REQUEST = 0x1e, /* data socket */ |
| 199 | P_OV_REPLY = 0x1f, |
| 200 | P_OV_RESULT = 0x20, /* meta socket */ |
| 201 | P_CSUM_RS_REQUEST = 0x21, /* data socket */ |
| 202 | P_RS_IS_IN_SYNC = 0x22, /* meta socket */ |
| 203 | P_SYNC_PARAM89 = 0x23, /* data socket, protocol version 89 replacement for P_SYNC_PARAM */ |
| 204 | P_COMPRESSED_BITMAP = 0x24, /* compressed or otherwise encoded bitmap transfer */ |
Philipp Reisner | 0ced55a | 2010-04-30 15:26:20 +0200 | [diff] [blame] | 205 | /* P_CKPT_FENCE_REQ = 0x25, * currently reserved for protocol D */ |
| 206 | /* P_CKPT_DISABLE_REQ = 0x26, * currently reserved for protocol D */ |
| 207 | P_DELAY_PROBE = 0x27, /* is used on BOTH sockets */ |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 208 | P_OUT_OF_SYNC = 0x28, /* Mark as out of sync (Outrunning), data socket */ |
Philipp Reisner | d612d30 | 2010-12-27 10:53:28 +0100 | [diff] [blame] | 209 | P_RS_CANCEL = 0x29, /* meta: Used to cancel RS_DATA_REQUEST packet by SyncSource */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 210 | |
Philipp Reisner | d612d30 | 2010-12-27 10:53:28 +0100 | [diff] [blame] | 211 | P_MAX_CMD = 0x2A, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 212 | P_MAY_IGNORE = 0x100, /* Flag to test if (cmd > P_MAY_IGNORE) ... */ |
| 213 | P_MAX_OPT_CMD = 0x101, |
| 214 | |
| 215 | /* special command ids for handshake */ |
| 216 | |
| 217 | P_HAND_SHAKE_M = 0xfff1, /* First Packet on the MetaSock */ |
| 218 | P_HAND_SHAKE_S = 0xfff2, /* First Packet on the Socket */ |
| 219 | |
| 220 | P_HAND_SHAKE = 0xfffe /* FIXED for the next century! */ |
| 221 | }; |
| 222 | |
| 223 | static inline const char *cmdname(enum drbd_packets cmd) |
| 224 | { |
| 225 | /* THINK may need to become several global tables |
| 226 | * when we want to support more than |
| 227 | * one PRO_VERSION */ |
| 228 | static const char *cmdnames[] = { |
| 229 | [P_DATA] = "Data", |
| 230 | [P_DATA_REPLY] = "DataReply", |
| 231 | [P_RS_DATA_REPLY] = "RSDataReply", |
| 232 | [P_BARRIER] = "Barrier", |
| 233 | [P_BITMAP] = "ReportBitMap", |
| 234 | [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget", |
| 235 | [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource", |
| 236 | [P_UNPLUG_REMOTE] = "UnplugRemote", |
| 237 | [P_DATA_REQUEST] = "DataRequest", |
| 238 | [P_RS_DATA_REQUEST] = "RSDataRequest", |
| 239 | [P_SYNC_PARAM] = "SyncParam", |
| 240 | [P_SYNC_PARAM89] = "SyncParam89", |
| 241 | [P_PROTOCOL] = "ReportProtocol", |
| 242 | [P_UUIDS] = "ReportUUIDs", |
| 243 | [P_SIZES] = "ReportSizes", |
| 244 | [P_STATE] = "ReportState", |
| 245 | [P_SYNC_UUID] = "ReportSyncUUID", |
| 246 | [P_AUTH_CHALLENGE] = "AuthChallenge", |
| 247 | [P_AUTH_RESPONSE] = "AuthResponse", |
| 248 | [P_PING] = "Ping", |
| 249 | [P_PING_ACK] = "PingAck", |
| 250 | [P_RECV_ACK] = "RecvAck", |
| 251 | [P_WRITE_ACK] = "WriteAck", |
| 252 | [P_RS_WRITE_ACK] = "RSWriteAck", |
| 253 | [P_DISCARD_ACK] = "DiscardAck", |
| 254 | [P_NEG_ACK] = "NegAck", |
| 255 | [P_NEG_DREPLY] = "NegDReply", |
| 256 | [P_NEG_RS_DREPLY] = "NegRSDReply", |
| 257 | [P_BARRIER_ACK] = "BarrierAck", |
| 258 | [P_STATE_CHG_REQ] = "StateChgRequest", |
| 259 | [P_STATE_CHG_REPLY] = "StateChgReply", |
| 260 | [P_OV_REQUEST] = "OVRequest", |
| 261 | [P_OV_REPLY] = "OVReply", |
| 262 | [P_OV_RESULT] = "OVResult", |
Lars Ellenberg | c42b6cf | 2010-03-03 02:44:11 +0100 | [diff] [blame] | 263 | [P_CSUM_RS_REQUEST] = "CsumRSRequest", |
| 264 | [P_RS_IS_IN_SYNC] = "CsumRSIsInSync", |
| 265 | [P_COMPRESSED_BITMAP] = "CBitmap", |
Philipp Reisner | a8cdfd8 | 2010-05-05 20:53:33 +0200 | [diff] [blame] | 266 | [P_DELAY_PROBE] = "DelayProbe", |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 267 | [P_OUT_OF_SYNC] = "OutOfSync", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 268 | [P_MAX_CMD] = NULL, |
| 269 | }; |
| 270 | |
| 271 | if (cmd == P_HAND_SHAKE_M) |
| 272 | return "HandShakeM"; |
| 273 | if (cmd == P_HAND_SHAKE_S) |
| 274 | return "HandShakeS"; |
| 275 | if (cmd == P_HAND_SHAKE) |
| 276 | return "HandShake"; |
| 277 | if (cmd >= P_MAX_CMD) |
| 278 | return "Unknown"; |
| 279 | return cmdnames[cmd]; |
| 280 | } |
| 281 | |
| 282 | /* for sending/receiving the bitmap, |
| 283 | * possibly in some encoding scheme */ |
| 284 | struct bm_xfer_ctx { |
| 285 | /* "const" |
| 286 | * stores total bits and long words |
| 287 | * of the bitmap, so we don't need to |
| 288 | * call the accessor functions over and again. */ |
| 289 | unsigned long bm_bits; |
| 290 | unsigned long bm_words; |
| 291 | /* during xfer, current position within the bitmap */ |
| 292 | unsigned long bit_offset; |
| 293 | unsigned long word_offset; |
| 294 | |
| 295 | /* statistics; index: (h->command == P_BITMAP) */ |
| 296 | unsigned packets[2]; |
| 297 | unsigned bytes[2]; |
| 298 | }; |
| 299 | |
| 300 | extern void INFO_bm_xfer_stats(struct drbd_conf *mdev, |
| 301 | const char *direction, struct bm_xfer_ctx *c); |
| 302 | |
| 303 | static inline void bm_xfer_ctx_bit_to_word_offset(struct bm_xfer_ctx *c) |
| 304 | { |
| 305 | /* word_offset counts "native long words" (32 or 64 bit), |
| 306 | * aligned at 64 bit. |
| 307 | * Encoded packet may end at an unaligned bit offset. |
| 308 | * In case a fallback clear text packet is transmitted in |
| 309 | * between, we adjust this offset back to the last 64bit |
| 310 | * aligned "native long word", which makes coding and decoding |
| 311 | * the plain text bitmap much more convenient. */ |
| 312 | #if BITS_PER_LONG == 64 |
| 313 | c->word_offset = c->bit_offset >> 6; |
| 314 | #elif BITS_PER_LONG == 32 |
| 315 | c->word_offset = c->bit_offset >> 5; |
| 316 | c->word_offset &= ~(1UL); |
| 317 | #else |
| 318 | # error "unsupported BITS_PER_LONG" |
| 319 | #endif |
| 320 | } |
| 321 | |
| 322 | #ifndef __packed |
| 323 | #define __packed __attribute__((packed)) |
| 324 | #endif |
| 325 | |
| 326 | /* This is the layout for a packet on the wire. |
| 327 | * The byteorder is the network byte order. |
| 328 | * (except block_id and barrier fields. |
| 329 | * these are pointers to local structs |
| 330 | * and have no relevance for the partner, |
| 331 | * which just echoes them as received.) |
| 332 | * |
| 333 | * NOTE that the payload starts at a long aligned offset, |
| 334 | * regardless of 32 or 64 bit arch! |
| 335 | */ |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 336 | struct p_header80 { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 337 | u32 magic; |
| 338 | u16 command; |
| 339 | u16 length; /* bytes of data after this header */ |
| 340 | u8 payload[0]; |
| 341 | } __packed; |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 342 | |
| 343 | /* Header for big packets, Used for data packets exceeding 64kB */ |
| 344 | struct p_header95 { |
| 345 | u16 magic; /* use DRBD_MAGIC_BIG here */ |
| 346 | u16 command; |
Philipp Reisner | 00b4253 | 2010-10-05 11:19:39 +0200 | [diff] [blame] | 347 | u32 length; /* Use only 24 bits of that. Ignore the highest 8 bit. */ |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 348 | u8 payload[0]; |
| 349 | } __packed; |
| 350 | |
| 351 | union p_header { |
| 352 | struct p_header80 h80; |
| 353 | struct p_header95 h95; |
| 354 | }; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 355 | |
| 356 | /* |
| 357 | * short commands, packets without payload, plain p_header: |
| 358 | * P_PING |
| 359 | * P_PING_ACK |
| 360 | * P_BECOME_SYNC_TARGET |
| 361 | * P_BECOME_SYNC_SOURCE |
| 362 | * P_UNPLUG_REMOTE |
| 363 | */ |
| 364 | |
| 365 | /* |
| 366 | * commands with out-of-struct payload: |
| 367 | * P_BITMAP (no additional fields) |
| 368 | * P_DATA, P_DATA_REPLY (see p_data) |
| 369 | * P_COMPRESSED_BITMAP (see receive_compressed_bitmap) |
| 370 | */ |
| 371 | |
| 372 | /* these defines must not be changed without changing the protocol version */ |
Philipp Reisner | 76d2e7e | 2010-08-25 11:58:05 +0200 | [diff] [blame] | 373 | #define DP_HARDBARRIER 1 /* depricated */ |
| 374 | #define DP_RW_SYNC 2 /* equals REQ_SYNC */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 375 | #define DP_MAY_SET_IN_SYNC 4 |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 376 | #define DP_UNPLUG 8 /* not used anymore */ |
Philipp Reisner | 76d2e7e | 2010-08-25 11:58:05 +0200 | [diff] [blame] | 377 | #define DP_FUA 16 /* equals REQ_FUA */ |
| 378 | #define DP_FLUSH 32 /* equals REQ_FLUSH */ |
| 379 | #define DP_DISCARD 64 /* equals REQ_DISCARD */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 380 | |
| 381 | struct p_data { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 382 | union p_header head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 383 | u64 sector; /* 64 bits sector number */ |
| 384 | u64 block_id; /* to identify the request in protocol B&C */ |
| 385 | u32 seq_num; |
| 386 | u32 dp_flags; |
| 387 | } __packed; |
| 388 | |
| 389 | /* |
| 390 | * commands which share a struct: |
| 391 | * p_block_ack: |
| 392 | * P_RECV_ACK (proto B), P_WRITE_ACK (proto C), |
| 393 | * P_DISCARD_ACK (proto C, two-primaries conflict detection) |
| 394 | * p_block_req: |
| 395 | * P_DATA_REQUEST, P_RS_DATA_REQUEST |
| 396 | */ |
| 397 | struct p_block_ack { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 398 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 399 | u64 sector; |
| 400 | u64 block_id; |
| 401 | u32 blksize; |
| 402 | u32 seq_num; |
| 403 | } __packed; |
| 404 | |
| 405 | |
| 406 | struct p_block_req { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 407 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 408 | u64 sector; |
| 409 | u64 block_id; |
| 410 | u32 blksize; |
| 411 | u32 pad; /* to multiple of 8 Byte */ |
| 412 | } __packed; |
| 413 | |
| 414 | /* |
| 415 | * commands with their own struct for additional fields: |
| 416 | * P_HAND_SHAKE |
| 417 | * P_BARRIER |
| 418 | * P_BARRIER_ACK |
| 419 | * P_SYNC_PARAM |
| 420 | * ReportParams |
| 421 | */ |
| 422 | |
| 423 | struct p_handshake { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 424 | struct p_header80 head; /* 8 bytes */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 425 | u32 protocol_min; |
| 426 | u32 feature_flags; |
| 427 | u32 protocol_max; |
| 428 | |
| 429 | /* should be more than enough for future enhancements |
| 430 | * for now, feature_flags and the reserverd array shall be zero. |
| 431 | */ |
| 432 | |
| 433 | u32 _pad; |
| 434 | u64 reserverd[7]; |
| 435 | } __packed; |
| 436 | /* 80 bytes, FIXED for the next century */ |
| 437 | |
| 438 | struct p_barrier { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 439 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 440 | u32 barrier; /* barrier number _handle_ only */ |
| 441 | u32 pad; /* to multiple of 8 Byte */ |
| 442 | } __packed; |
| 443 | |
| 444 | struct p_barrier_ack { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 445 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 446 | u32 barrier; |
| 447 | u32 set_size; |
| 448 | } __packed; |
| 449 | |
| 450 | struct p_rs_param { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 451 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 452 | u32 rate; |
| 453 | |
| 454 | /* Since protocol version 88 and higher. */ |
| 455 | char verify_alg[0]; |
| 456 | } __packed; |
| 457 | |
| 458 | struct p_rs_param_89 { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 459 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 460 | u32 rate; |
| 461 | /* protocol version 89: */ |
| 462 | char verify_alg[SHARED_SECRET_MAX]; |
| 463 | char csums_alg[SHARED_SECRET_MAX]; |
| 464 | } __packed; |
| 465 | |
Philipp Reisner | 8e26f9c | 2010-07-06 17:25:54 +0200 | [diff] [blame] | 466 | struct p_rs_param_95 { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 467 | struct p_header80 head; |
Philipp Reisner | 8e26f9c | 2010-07-06 17:25:54 +0200 | [diff] [blame] | 468 | u32 rate; |
| 469 | char verify_alg[SHARED_SECRET_MAX]; |
| 470 | char csums_alg[SHARED_SECRET_MAX]; |
| 471 | u32 c_plan_ahead; |
| 472 | u32 c_delay_target; |
| 473 | u32 c_fill_target; |
| 474 | u32 c_max_rate; |
| 475 | } __packed; |
| 476 | |
Philipp Reisner | cf14c2e | 2010-02-02 21:03:50 +0100 | [diff] [blame] | 477 | enum drbd_conn_flags { |
| 478 | CF_WANT_LOSE = 1, |
| 479 | CF_DRY_RUN = 2, |
| 480 | }; |
| 481 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 482 | struct p_protocol { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 483 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 484 | u32 protocol; |
| 485 | u32 after_sb_0p; |
| 486 | u32 after_sb_1p; |
| 487 | u32 after_sb_2p; |
Philipp Reisner | cf14c2e | 2010-02-02 21:03:50 +0100 | [diff] [blame] | 488 | u32 conn_flags; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 489 | u32 two_primaries; |
| 490 | |
| 491 | /* Since protocol version 87 and higher. */ |
| 492 | char integrity_alg[0]; |
| 493 | |
| 494 | } __packed; |
| 495 | |
| 496 | struct p_uuids { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 497 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 498 | u64 uuid[UI_EXTENDED_SIZE]; |
| 499 | } __packed; |
| 500 | |
| 501 | struct p_rs_uuid { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 502 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 503 | u64 uuid; |
| 504 | } __packed; |
| 505 | |
| 506 | struct p_sizes { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 507 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 508 | u64 d_size; /* size of disk */ |
| 509 | u64 u_size; /* user requested size */ |
| 510 | u64 c_size; /* current exported size */ |
Lars Ellenberg | 1816a2b | 2010-11-11 15:19:07 +0100 | [diff] [blame] | 511 | u32 max_bio_size; /* Maximal size of a BIO */ |
Philipp Reisner | e89b591 | 2010-03-24 17:11:33 +0100 | [diff] [blame] | 512 | u16 queue_order_type; /* not yet implemented in DRBD*/ |
| 513 | u16 dds_flags; /* use enum dds_flags here. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 514 | } __packed; |
| 515 | |
| 516 | struct p_state { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 517 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 518 | u32 state; |
| 519 | } __packed; |
| 520 | |
| 521 | struct p_req_state { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 522 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 523 | u32 mask; |
| 524 | u32 val; |
| 525 | } __packed; |
| 526 | |
| 527 | struct p_req_state_reply { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 528 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 529 | u32 retcode; |
| 530 | } __packed; |
| 531 | |
| 532 | struct p_drbd06_param { |
| 533 | u64 size; |
| 534 | u32 state; |
| 535 | u32 blksize; |
| 536 | u32 protocol; |
| 537 | u32 version; |
| 538 | u32 gen_cnt[5]; |
| 539 | u32 bit_map_gen[5]; |
| 540 | } __packed; |
| 541 | |
| 542 | struct p_discard { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 543 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 544 | u64 block_id; |
| 545 | u32 seq_num; |
| 546 | u32 pad; |
| 547 | } __packed; |
| 548 | |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 549 | struct p_block_desc { |
| 550 | struct p_header80 head; |
| 551 | u64 sector; |
| 552 | u32 blksize; |
| 553 | u32 pad; /* to multiple of 8 Byte */ |
| 554 | } __packed; |
| 555 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 556 | /* Valid values for the encoding field. |
| 557 | * Bump proto version when changing this. */ |
| 558 | enum drbd_bitmap_code { |
| 559 | /* RLE_VLI_Bytes = 0, |
| 560 | * and other bit variants had been defined during |
| 561 | * algorithm evaluation. */ |
| 562 | RLE_VLI_Bits = 2, |
| 563 | }; |
| 564 | |
| 565 | struct p_compressed_bm { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 566 | struct p_header80 head; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 567 | /* (encoding & 0x0f): actual encoding, see enum drbd_bitmap_code |
| 568 | * (encoding & 0x80): polarity (set/unset) of first runlength |
| 569 | * ((encoding >> 4) & 0x07): pad_bits, number of trailing zero bits |
| 570 | * used to pad up to head.length bytes |
| 571 | */ |
| 572 | u8 encoding; |
| 573 | |
| 574 | u8 code[0]; |
| 575 | } __packed; |
| 576 | |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 577 | struct p_delay_probe93 { |
| 578 | struct p_header80 head; |
| 579 | u32 seq_num; /* sequence number to match the two probe packets */ |
| 580 | u32 offset; /* usecs the probe got sent after the reference time point */ |
Philipp Reisner | 0ced55a | 2010-04-30 15:26:20 +0200 | [diff] [blame] | 581 | } __packed; |
| 582 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 583 | /* DCBP: Drbd Compressed Bitmap Packet ... */ |
| 584 | static inline enum drbd_bitmap_code |
| 585 | DCBP_get_code(struct p_compressed_bm *p) |
| 586 | { |
| 587 | return (enum drbd_bitmap_code)(p->encoding & 0x0f); |
| 588 | } |
| 589 | |
| 590 | static inline void |
| 591 | DCBP_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code) |
| 592 | { |
| 593 | BUG_ON(code & ~0xf); |
| 594 | p->encoding = (p->encoding & ~0xf) | code; |
| 595 | } |
| 596 | |
| 597 | static inline int |
| 598 | DCBP_get_start(struct p_compressed_bm *p) |
| 599 | { |
| 600 | return (p->encoding & 0x80) != 0; |
| 601 | } |
| 602 | |
| 603 | static inline void |
| 604 | DCBP_set_start(struct p_compressed_bm *p, int set) |
| 605 | { |
| 606 | p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0); |
| 607 | } |
| 608 | |
| 609 | static inline int |
| 610 | DCBP_get_pad_bits(struct p_compressed_bm *p) |
| 611 | { |
| 612 | return (p->encoding >> 4) & 0x7; |
| 613 | } |
| 614 | |
| 615 | static inline void |
| 616 | DCBP_set_pad_bits(struct p_compressed_bm *p, int n) |
| 617 | { |
| 618 | BUG_ON(n & ~0x7); |
| 619 | p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4); |
| 620 | } |
| 621 | |
| 622 | /* one bitmap packet, including the p_header, |
| 623 | * should fit within one _architecture independend_ page. |
| 624 | * so we need to use the fixed size 4KiB page size |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 625 | * most architectures have used for a long time. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 626 | */ |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 627 | #define BM_PACKET_PAYLOAD_BYTES (4096 - sizeof(struct p_header80)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 628 | #define BM_PACKET_WORDS (BM_PACKET_PAYLOAD_BYTES/sizeof(long)) |
| 629 | #define BM_PACKET_VLI_BYTES_MAX (4096 - sizeof(struct p_compressed_bm)) |
| 630 | #if (PAGE_SIZE < 4096) |
| 631 | /* drbd_send_bitmap / receive_bitmap would break horribly */ |
| 632 | #error "PAGE_SIZE too small" |
| 633 | #endif |
| 634 | |
| 635 | union p_polymorph { |
Philipp Reisner | 02918be | 2010-08-20 14:35:10 +0200 | [diff] [blame] | 636 | union p_header header; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 637 | struct p_handshake handshake; |
| 638 | struct p_data data; |
| 639 | struct p_block_ack block_ack; |
| 640 | struct p_barrier barrier; |
| 641 | struct p_barrier_ack barrier_ack; |
| 642 | struct p_rs_param_89 rs_param_89; |
Philipp Reisner | 8e26f9c | 2010-07-06 17:25:54 +0200 | [diff] [blame] | 643 | struct p_rs_param_95 rs_param_95; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 644 | struct p_protocol protocol; |
| 645 | struct p_sizes sizes; |
| 646 | struct p_uuids uuids; |
| 647 | struct p_state state; |
| 648 | struct p_req_state req_state; |
| 649 | struct p_req_state_reply req_state_reply; |
| 650 | struct p_block_req block_req; |
Philipp Reisner | 02918be | 2010-08-20 14:35:10 +0200 | [diff] [blame] | 651 | struct p_delay_probe93 delay_probe93; |
| 652 | struct p_rs_uuid rs_uuid; |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 653 | struct p_block_desc block_desc; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 654 | } __packed; |
| 655 | |
| 656 | /**********************************************************************/ |
| 657 | enum drbd_thread_state { |
| 658 | None, |
| 659 | Running, |
| 660 | Exiting, |
| 661 | Restarting |
| 662 | }; |
| 663 | |
| 664 | struct drbd_thread { |
| 665 | spinlock_t t_lock; |
| 666 | struct task_struct *task; |
| 667 | struct completion stop; |
| 668 | enum drbd_thread_state t_state; |
| 669 | int (*function) (struct drbd_thread *); |
| 670 | struct drbd_conf *mdev; |
| 671 | int reset_cpu_mask; |
| 672 | }; |
| 673 | |
| 674 | static inline enum drbd_thread_state get_t_state(struct drbd_thread *thi) |
| 675 | { |
| 676 | /* THINK testing the t_state seems to be uncritical in all cases |
| 677 | * (but thread_{start,stop}), so we can read it *without* the lock. |
| 678 | * --lge */ |
| 679 | |
| 680 | smp_rmb(); |
| 681 | return thi->t_state; |
| 682 | } |
| 683 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 684 | struct drbd_work; |
| 685 | typedef int (*drbd_work_cb)(struct drbd_conf *, struct drbd_work *, int cancel); |
| 686 | struct drbd_work { |
| 687 | struct list_head list; |
| 688 | drbd_work_cb cb; |
| 689 | }; |
| 690 | |
| 691 | struct drbd_tl_epoch; |
| 692 | struct drbd_request { |
| 693 | struct drbd_work w; |
| 694 | struct drbd_conf *mdev; |
| 695 | |
| 696 | /* if local IO is not allowed, will be NULL. |
| 697 | * if local IO _is_ allowed, holds the locally submitted bio clone, |
| 698 | * or, after local IO completion, the ERR_PTR(error). |
| 699 | * see drbd_endio_pri(). */ |
| 700 | struct bio *private_bio; |
| 701 | |
Bart Van Assche | 24c4830 | 2011-05-21 18:32:29 +0200 | [diff] [blame] | 702 | struct hlist_node collision; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 703 | sector_t sector; |
| 704 | unsigned int size; |
| 705 | unsigned int epoch; /* barrier_nr */ |
| 706 | |
| 707 | /* barrier_nr: used to check on "completion" whether this req was in |
| 708 | * the current epoch, and we therefore have to close it, |
| 709 | * starting a new epoch... |
| 710 | */ |
| 711 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 712 | struct list_head tl_requests; /* ring list in the transfer log */ |
| 713 | struct bio *master_bio; /* master bio pointer */ |
| 714 | unsigned long rq_state; /* see comments above _req_mod() */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 715 | unsigned long start_time; |
| 716 | }; |
| 717 | |
| 718 | struct drbd_tl_epoch { |
| 719 | struct drbd_work w; |
| 720 | struct list_head requests; /* requests before */ |
| 721 | struct drbd_tl_epoch *next; /* pointer to the next barrier */ |
| 722 | unsigned int br_number; /* the barriers identifier. */ |
Philipp Reisner | 7e602c0 | 2010-05-27 14:49:27 +0200 | [diff] [blame] | 723 | int n_writes; /* number of requests attached before this barrier */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 724 | }; |
| 725 | |
| 726 | struct drbd_request; |
| 727 | |
| 728 | /* These Tl_epoch_entries may be in one of 6 lists: |
| 729 | active_ee .. data packet being written |
| 730 | sync_ee .. syncer block being written |
| 731 | done_ee .. block written, need to send P_WRITE_ACK |
| 732 | read_ee .. [RS]P_DATA_REQUEST being read |
| 733 | */ |
| 734 | |
| 735 | struct drbd_epoch { |
| 736 | struct list_head list; |
| 737 | unsigned int barrier_nr; |
| 738 | atomic_t epoch_size; /* increased on every request added. */ |
| 739 | atomic_t active; /* increased on every req. added, and dec on every finished. */ |
| 740 | unsigned long flags; |
| 741 | }; |
| 742 | |
| 743 | /* drbd_epoch flag bits */ |
| 744 | enum { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 745 | DE_HAVE_BARRIER_NUMBER, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 746 | }; |
| 747 | |
| 748 | enum epoch_event { |
| 749 | EV_PUT, |
| 750 | EV_GOT_BARRIER_NR, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 751 | EV_BECAME_LAST, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 752 | EV_CLEANUP = 32, /* used as flag */ |
| 753 | }; |
| 754 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 755 | struct drbd_wq_barrier { |
| 756 | struct drbd_work w; |
| 757 | struct completion done; |
| 758 | }; |
| 759 | |
| 760 | struct digest_info { |
| 761 | int digest_size; |
| 762 | void *digest; |
| 763 | }; |
| 764 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 765 | struct drbd_epoch_entry { |
| 766 | struct drbd_work w; |
Bart Van Assche | 24c4830 | 2011-05-21 18:32:29 +0200 | [diff] [blame] | 767 | struct hlist_node collision; |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 768 | struct drbd_epoch *epoch; /* for writes */ |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 769 | struct drbd_conf *mdev; |
| 770 | struct page *pages; |
| 771 | atomic_t pending_bios; |
| 772 | unsigned int size; |
| 773 | /* see comments on ee flag bits below */ |
| 774 | unsigned long flags; |
| 775 | sector_t sector; |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 776 | union { |
| 777 | u64 block_id; |
| 778 | struct digest_info *digest; |
| 779 | }; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 780 | }; |
| 781 | |
| 782 | /* ee flag bits. |
| 783 | * While corresponding bios are in flight, the only modification will be |
| 784 | * set_bit WAS_ERROR, which has to be atomic. |
| 785 | * If no bios are in flight yet, or all have been completed, |
| 786 | * non-atomic modification to ee->flags is ok. |
| 787 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 788 | enum { |
| 789 | __EE_CALL_AL_COMPLETE_IO, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 790 | __EE_MAY_SET_IN_SYNC, |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 791 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 792 | /* In case a barrier failed, |
| 793 | * we need to resubmit without the barrier flag. */ |
| 794 | __EE_RESUBMITTED, |
| 795 | |
| 796 | /* we may have several bios per epoch entry. |
| 797 | * if any of those fail, we set this flag atomically |
| 798 | * from the endio callback */ |
| 799 | __EE_WAS_ERROR, |
Lars Ellenberg | c36c3ce | 2010-08-11 20:42:55 +0200 | [diff] [blame] | 800 | |
| 801 | /* This ee has a pointer to a digest instead of a block id */ |
| 802 | __EE_HAS_DIGEST, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 803 | }; |
| 804 | #define EE_CALL_AL_COMPLETE_IO (1<<__EE_CALL_AL_COMPLETE_IO) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 805 | #define EE_MAY_SET_IN_SYNC (1<<__EE_MAY_SET_IN_SYNC) |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 806 | #define EE_RESUBMITTED (1<<__EE_RESUBMITTED) |
| 807 | #define EE_WAS_ERROR (1<<__EE_WAS_ERROR) |
Lars Ellenberg | c36c3ce | 2010-08-11 20:42:55 +0200 | [diff] [blame] | 808 | #define EE_HAS_DIGEST (1<<__EE_HAS_DIGEST) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 809 | |
| 810 | /* global flag bits */ |
| 811 | enum { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 812 | CREATE_BARRIER, /* next P_DATA is preceded by a P_BARRIER */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 813 | SIGNAL_ASENDER, /* whether asender wants to be interrupted */ |
| 814 | SEND_PING, /* whether asender should send a ping asap */ |
| 815 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 816 | UNPLUG_REMOTE, /* sending a "UnplugRemote" could help */ |
| 817 | MD_DIRTY, /* current uuids and flags not yet on disk */ |
| 818 | DISCARD_CONCURRENT, /* Set on one node, cleared on the peer! */ |
| 819 | USE_DEGR_WFC_T, /* degr-wfc-timeout instead of wfc-timeout. */ |
| 820 | CLUSTER_ST_CHANGE, /* Cluster wide state change going on... */ |
| 821 | CL_ST_CHG_SUCCESS, |
| 822 | CL_ST_CHG_FAIL, |
| 823 | CRASHED_PRIMARY, /* This node was a crashed primary. |
| 824 | * Gets cleared when the state.conn |
| 825 | * goes into C_CONNECTED state. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 826 | CONSIDER_RESYNC, |
| 827 | |
Philipp Reisner | a8a4e51 | 2010-08-25 10:21:04 +0200 | [diff] [blame] | 828 | MD_NO_FUA, /* Users wants us to not use FUA/FLUSH on meta data dev */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 829 | SUSPEND_IO, /* suspend application io */ |
| 830 | BITMAP_IO, /* suspend application io; |
| 831 | once no more io in flight, start bitmap io */ |
| 832 | BITMAP_IO_QUEUED, /* Started bitmap IO */ |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 833 | GO_DISKLESS, /* Disk is being detached, on io-error or admin request. */ |
| 834 | WAS_IO_ERROR, /* Local disk failed returned IO error */ |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 835 | FORCE_DETACH, /* Force-detach from local disk, aborting any pending local IO */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 836 | RESYNC_AFTER_NEG, /* Resync after online grow after the attach&negotiate finished. */ |
| 837 | NET_CONGESTED, /* The data socket is congested */ |
| 838 | |
| 839 | CONFIG_PENDING, /* serialization of (re)configuration requests. |
| 840 | * if set, also prevents the device from dying */ |
| 841 | DEVICE_DYING, /* device became unconfigured, |
| 842 | * but worker thread is still handling the cleanup. |
| 843 | * reconfiguring (nl_disk_conf, nl_net_conf) is dissalowed, |
| 844 | * while this is set. */ |
| 845 | RESIZE_PENDING, /* Size change detected locally, waiting for the response from |
| 846 | * the peer, if it changed there as well. */ |
Philipp Reisner | cf14c2e | 2010-02-02 21:03:50 +0100 | [diff] [blame] | 847 | CONN_DRY_RUN, /* Expect disconnect after resync handshake. */ |
Philipp Reisner | 309d160 | 2010-03-02 15:03:44 +0100 | [diff] [blame] | 848 | GOT_PING_ACK, /* set when we receive a ping_ack packet, misc wait gets woken */ |
Philipp Reisner | 43a5182 | 2010-06-11 11:26:34 +0200 | [diff] [blame] | 849 | NEW_CUR_UUID, /* Create new current UUID when thawing IO */ |
Philipp Reisner | 0778286 | 2010-08-31 12:00:50 +0200 | [diff] [blame] | 850 | AL_SUSPENDED, /* Activity logging is currently suspended. */ |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 851 | AHEAD_TO_SYNC_SOURCE, /* Ahead -> SyncSource queued */ |
Philipp Reisner | 197296f | 2012-03-26 16:47:11 +0200 | [diff] [blame] | 852 | STATE_SENT, /* Do not change state/UUIDs while this is set */ |
Lars Ellenberg | c2ba686 | 2012-06-14 15:14:06 +0200 | [diff] [blame] | 853 | |
| 854 | CALLBACK_PENDING, /* Whether we have a call_usermodehelper(, UMH_WAIT_PROC) |
| 855 | * pending, from drbd worker context. |
| 856 | * If set, bdi_write_congested() returns true, |
| 857 | * so shrink_page_list() would not recurse into, |
| 858 | * and potentially deadlock on, this drbd worker. |
| 859 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 860 | }; |
| 861 | |
| 862 | struct drbd_bitmap; /* opaque for drbd_conf */ |
| 863 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 864 | /* definition of bits in bm_flags to be used in drbd_bm_lock |
| 865 | * and drbd_bitmap_io and friends. */ |
| 866 | enum bm_flag { |
| 867 | /* do we need to kfree, or vfree bm_pages? */ |
| 868 | BM_P_VMALLOCED = 0x10000, /* internal use only, will be masked out */ |
| 869 | |
| 870 | /* currently locked for bulk operation */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 871 | BM_LOCKED_MASK = 0xf, |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 872 | |
| 873 | /* in detail, that is: */ |
| 874 | BM_DONT_CLEAR = 0x1, |
| 875 | BM_DONT_SET = 0x2, |
| 876 | BM_DONT_TEST = 0x4, |
| 877 | |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 878 | /* so we can mark it locked for bulk operation, |
| 879 | * and still allow all non-bulk operations */ |
| 880 | BM_IS_LOCKED = 0x8, |
| 881 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 882 | /* (test bit, count bit) allowed (common case) */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 883 | BM_LOCKED_TEST_ALLOWED = BM_DONT_CLEAR | BM_DONT_SET | BM_IS_LOCKED, |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 884 | |
| 885 | /* testing bits, as well as setting new bits allowed, but clearing bits |
| 886 | * would be unexpected. Used during bitmap receive. Setting new bits |
| 887 | * requires sending of "out-of-sync" information, though. */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 888 | BM_LOCKED_SET_ALLOWED = BM_DONT_CLEAR | BM_IS_LOCKED, |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 889 | |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 890 | /* for drbd_bm_write_copy_pages, everything is allowed, |
| 891 | * only concurrent bulk operations are locked out. */ |
| 892 | BM_LOCKED_CHANGE_ALLOWED = BM_IS_LOCKED, |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 893 | }; |
| 894 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 895 | struct drbd_work_queue { |
| 896 | struct list_head q; |
| 897 | struct semaphore s; /* producers up it, worker down()s it */ |
| 898 | spinlock_t q_lock; /* to protect the list. */ |
| 899 | }; |
| 900 | |
| 901 | struct drbd_socket { |
| 902 | struct drbd_work_queue work; |
| 903 | struct mutex mutex; |
| 904 | struct socket *socket; |
| 905 | /* this way we get our |
| 906 | * send/receive buffers off the stack */ |
| 907 | union p_polymorph sbuf; |
| 908 | union p_polymorph rbuf; |
| 909 | }; |
| 910 | |
| 911 | struct drbd_md { |
| 912 | u64 md_offset; /* sector offset to 'super' block */ |
| 913 | |
| 914 | u64 la_size_sect; /* last agreed size, unit sectors */ |
| 915 | u64 uuid[UI_SIZE]; |
| 916 | u64 device_uuid; |
| 917 | u32 flags; |
| 918 | u32 md_size_sect; |
| 919 | |
| 920 | s32 al_offset; /* signed relative sector offset to al area */ |
| 921 | s32 bm_offset; /* signed relative sector offset to bitmap */ |
| 922 | |
| 923 | /* u32 al_nr_extents; important for restoring the AL |
| 924 | * is stored into sync_conf.al_extents, which in turn |
| 925 | * gets applied to act_log->nr_elements |
| 926 | */ |
| 927 | }; |
| 928 | |
| 929 | /* for sync_conf and other types... */ |
| 930 | #define NL_PACKET(name, number, fields) struct name { fields }; |
| 931 | #define NL_INTEGER(pn,pr,member) int member; |
| 932 | #define NL_INT64(pn,pr,member) __u64 member; |
| 933 | #define NL_BIT(pn,pr,member) unsigned member:1; |
| 934 | #define NL_STRING(pn,pr,member,len) unsigned char member[len]; int member ## _len; |
Joe Perches | 1d273b9 | 2011-06-03 02:28:46 -0700 | [diff] [blame] | 935 | #include <linux/drbd_nl.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 936 | |
| 937 | struct drbd_backing_dev { |
| 938 | struct block_device *backing_bdev; |
| 939 | struct block_device *md_bdev; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 940 | struct drbd_md md; |
| 941 | struct disk_conf dc; /* The user provided config... */ |
| 942 | sector_t known_size; /* last known size of that backing device */ |
| 943 | }; |
| 944 | |
| 945 | struct drbd_md_io { |
Philipp Reisner | 0c46442 | 2011-06-26 22:26:31 +0200 | [diff] [blame] | 946 | unsigned int done; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 947 | int error; |
| 948 | }; |
| 949 | |
| 950 | struct bm_io_work { |
| 951 | struct drbd_work w; |
| 952 | char *why; |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 953 | enum bm_flag flags; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 954 | int (*io_fn)(struct drbd_conf *mdev); |
| 955 | void (*done)(struct drbd_conf *mdev, int rv); |
| 956 | }; |
| 957 | |
| 958 | enum write_ordering_e { |
| 959 | WO_none, |
| 960 | WO_drain_io, |
| 961 | WO_bdev_flush, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 962 | }; |
| 963 | |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 964 | struct fifo_buffer { |
| 965 | int *values; |
| 966 | unsigned int head_index; |
| 967 | unsigned int size; |
| 968 | }; |
| 969 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 970 | struct drbd_conf { |
| 971 | /* things that are stored as / read from meta data on disk */ |
| 972 | unsigned long flags; |
| 973 | |
| 974 | /* configured by drbdsetup */ |
| 975 | struct net_conf *net_conf; /* protected by get_net_conf() and put_net_conf() */ |
| 976 | struct syncer_conf sync_conf; |
| 977 | struct drbd_backing_dev *ldev __protected_by(local); |
| 978 | |
| 979 | sector_t p_size; /* partner's disk size */ |
| 980 | struct request_queue *rq_queue; |
| 981 | struct block_device *this_bdev; |
| 982 | struct gendisk *vdisk; |
| 983 | |
| 984 | struct drbd_socket data; /* data/barrier/cstate/parameter packets */ |
| 985 | struct drbd_socket meta; /* ping/ack (metadata) packets */ |
| 986 | int agreed_pro_version; /* actually used protocol version */ |
| 987 | unsigned long last_received; /* in jiffies, either socket */ |
| 988 | unsigned int ko_count; |
| 989 | struct drbd_work resync_work, |
| 990 | unplug_work, |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 991 | go_diskless, |
Philipp Reisner | c4752ef | 2010-10-27 17:32:36 +0200 | [diff] [blame] | 992 | md_sync_work, |
| 993 | start_resync_work; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 994 | struct timer_list resync_timer; |
| 995 | struct timer_list md_sync_timer; |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 996 | struct timer_list start_resync_timer; |
Philipp Reisner | 7fde2be | 2011-03-01 11:08:28 +0100 | [diff] [blame] | 997 | struct timer_list request_timer; |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 998 | #ifdef DRBD_DEBUG_MD_SYNC |
| 999 | struct { |
| 1000 | unsigned int line; |
| 1001 | const char* func; |
| 1002 | } last_md_mark_dirty; |
| 1003 | #endif |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1004 | |
| 1005 | /* Used after attach while negotiating new disk state. */ |
| 1006 | union drbd_state new_state_tmp; |
| 1007 | |
| 1008 | union drbd_state state; |
| 1009 | wait_queue_head_t misc_wait; |
| 1010 | wait_queue_head_t state_wait; /* upon each state change. */ |
Philipp Reisner | 84dfb9f | 2010-06-23 11:20:05 +0200 | [diff] [blame] | 1011 | wait_queue_head_t net_cnt_wait; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1012 | unsigned int send_cnt; |
| 1013 | unsigned int recv_cnt; |
| 1014 | unsigned int read_cnt; |
| 1015 | unsigned int writ_cnt; |
| 1016 | unsigned int al_writ_cnt; |
| 1017 | unsigned int bm_writ_cnt; |
| 1018 | atomic_t ap_bio_cnt; /* Requests we need to complete */ |
| 1019 | atomic_t ap_pending_cnt; /* AP data packets on the wire, ack expected */ |
| 1020 | atomic_t rs_pending_cnt; /* RS request/data packets on the wire */ |
| 1021 | atomic_t unacked_cnt; /* Need to send replys for */ |
| 1022 | atomic_t local_cnt; /* Waiting for local completion */ |
| 1023 | atomic_t net_cnt; /* Users of net_conf */ |
| 1024 | spinlock_t req_lock; |
| 1025 | struct drbd_tl_epoch *unused_spare_tle; /* for pre-allocation */ |
| 1026 | struct drbd_tl_epoch *newest_tle; |
| 1027 | struct drbd_tl_epoch *oldest_tle; |
| 1028 | struct list_head out_of_sequence_requests; |
Philipp Reisner | 6d7e32f | 2011-03-15 10:25:18 +0100 | [diff] [blame] | 1029 | struct list_head barrier_acked_requests; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1030 | struct hlist_head *tl_hash; |
| 1031 | unsigned int tl_hash_s; |
| 1032 | |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1033 | /* blocks to resync in this run [unit BM_BLOCK_SIZE] */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1034 | unsigned long rs_total; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1035 | /* number of resync blocks that failed in this run */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1036 | unsigned long rs_failed; |
| 1037 | /* Syncer's start time [unit jiffies] */ |
| 1038 | unsigned long rs_start; |
| 1039 | /* cumulated time in PausedSyncX state [unit jiffies] */ |
| 1040 | unsigned long rs_paused; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 1041 | /* skipped because csum was equal [unit BM_BLOCK_SIZE] */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1042 | unsigned long rs_same_csum; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 1043 | #define DRBD_SYNC_MARKS 8 |
| 1044 | #define DRBD_SYNC_MARK_STEP (3*HZ) |
| 1045 | /* block not up-to-date at mark [unit BM_BLOCK_SIZE] */ |
| 1046 | unsigned long rs_mark_left[DRBD_SYNC_MARKS]; |
| 1047 | /* marks's time [unit jiffies] */ |
| 1048 | unsigned long rs_mark_time[DRBD_SYNC_MARKS]; |
| 1049 | /* current index into rs_mark_{left,time} */ |
| 1050 | int rs_last_mark; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1051 | |
| 1052 | /* where does the admin want us to start? (sector) */ |
| 1053 | sector_t ov_start_sector; |
| 1054 | /* where are we now? (sector) */ |
| 1055 | sector_t ov_position; |
| 1056 | /* Start sector of out of sync range (to merge printk reporting). */ |
| 1057 | sector_t ov_last_oos_start; |
| 1058 | /* size of out-of-sync range in sectors. */ |
| 1059 | sector_t ov_last_oos_size; |
| 1060 | unsigned long ov_left; /* in bits */ |
| 1061 | struct crypto_hash *csums_tfm; |
| 1062 | struct crypto_hash *verify_tfm; |
| 1063 | |
Lars Ellenberg | ba280c0 | 2012-04-25 11:46:14 +0200 | [diff] [blame] | 1064 | unsigned long last_reattach_jif; |
| 1065 | unsigned long last_reconnect_jif; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1066 | struct drbd_thread receiver; |
| 1067 | struct drbd_thread worker; |
| 1068 | struct drbd_thread asender; |
| 1069 | struct drbd_bitmap *bitmap; |
| 1070 | unsigned long bm_resync_fo; /* bit offset for drbd_bm_find_next */ |
| 1071 | |
| 1072 | /* Used to track operations of resync... */ |
| 1073 | struct lru_cache *resync; |
| 1074 | /* Number of locked elements in resync LRU */ |
| 1075 | unsigned int resync_locked; |
| 1076 | /* resync extent number waiting for application requests */ |
| 1077 | unsigned int resync_wenr; |
| 1078 | |
| 1079 | int open_cnt; |
| 1080 | u64 *p_uuid; |
| 1081 | struct drbd_epoch *current_epoch; |
| 1082 | spinlock_t epoch_lock; |
| 1083 | unsigned int epochs; |
| 1084 | enum write_ordering_e write_ordering; |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 1085 | struct list_head active_ee; /* IO in progress (P_DATA gets written to disk) */ |
| 1086 | struct list_head sync_ee; /* IO in progress (P_RS_DATA_REPLY gets written to disk) */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1087 | struct list_head done_ee; /* send ack */ |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 1088 | struct list_head read_ee; /* IO in progress (any read) */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1089 | struct list_head net_ee; /* zero-copy network send in progress */ |
| 1090 | struct hlist_head *ee_hash; /* is proteced by req_lock! */ |
| 1091 | unsigned int ee_hash_s; |
| 1092 | |
| 1093 | /* this one is protected by ee_lock, single thread */ |
| 1094 | struct drbd_epoch_entry *last_write_w_barrier; |
| 1095 | |
| 1096 | int next_barrier_nr; |
| 1097 | struct hlist_head *app_reads_hash; /* is proteced by req_lock */ |
| 1098 | struct list_head resync_reads; |
Lars Ellenberg | 435f074 | 2010-09-06 12:30:25 +0200 | [diff] [blame] | 1099 | atomic_t pp_in_use; /* allocated from page pool */ |
| 1100 | atomic_t pp_in_use_by_net; /* sendpage()d, still referenced by tcp */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1101 | wait_queue_head_t ee_wait; |
| 1102 | struct page *md_io_page; /* one page buffer for md_io */ |
| 1103 | struct page *md_io_tmpp; /* for logical_block_size != 512 */ |
Philipp Reisner | cc94c65 | 2011-06-26 11:20:27 +0200 | [diff] [blame] | 1104 | struct drbd_md_io md_io; |
Philipp Reisner | e171173 | 2011-06-27 11:51:46 +0200 | [diff] [blame] | 1105 | atomic_t md_io_in_use; /* protects the md_io, md_io_page and md_io_tmpp */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1106 | spinlock_t al_lock; |
| 1107 | wait_queue_head_t al_wait; |
| 1108 | struct lru_cache *act_log; /* activity log */ |
| 1109 | unsigned int al_tr_number; |
| 1110 | int al_tr_cycle; |
| 1111 | int al_tr_pos; /* position of the next transaction in the journal */ |
| 1112 | struct crypto_hash *cram_hmac_tfm; |
| 1113 | struct crypto_hash *integrity_w_tfm; /* to be used by the worker thread */ |
| 1114 | struct crypto_hash *integrity_r_tfm; /* to be used by the receiver thread */ |
| 1115 | void *int_dig_out; |
| 1116 | void *int_dig_in; |
| 1117 | void *int_dig_vv; |
| 1118 | wait_queue_head_t seq_wait; |
| 1119 | atomic_t packet_seq; |
| 1120 | unsigned int peer_seq; |
| 1121 | spinlock_t peer_seq_lock; |
| 1122 | unsigned int minor; |
| 1123 | unsigned long comm_bm_set; /* communicated number of set bits. */ |
| 1124 | cpumask_var_t cpu_mask; |
| 1125 | struct bm_io_work bm_io_work; |
| 1126 | u64 ed_uuid; /* UUID of the exposed data */ |
| 1127 | struct mutex state_mutex; |
| 1128 | char congestion_reason; /* Why we where congested... */ |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 1129 | atomic_t rs_sect_in; /* for incoming resync data rate, SyncTarget */ |
| 1130 | atomic_t rs_sect_ev; /* for submitted resync data rate, both */ |
| 1131 | int rs_last_sect_ev; /* counter to compare with */ |
| 1132 | int rs_last_events; /* counter of read or write "events" (unit sectors) |
| 1133 | * on the lower level device when we last looked. */ |
| 1134 | int c_sync_rate; /* current resync rate after syncer throttle magic */ |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 1135 | struct fifo_buffer rs_plan_s; /* correction values of resync planer */ |
| 1136 | int rs_in_flight; /* resync sectors in flight (to proxy, in proxy and from proxy) */ |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1137 | int rs_planed; /* resync sectors already planned */ |
Philipp Reisner | 759fbdf | 2010-10-26 16:02:27 +0200 | [diff] [blame] | 1138 | atomic_t ap_in_flight; /* App sectors in flight (waiting for ack) */ |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 1139 | unsigned int peer_max_bio_size; |
| 1140 | unsigned int local_max_bio_size; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1141 | }; |
| 1142 | |
| 1143 | static inline struct drbd_conf *minor_to_mdev(unsigned int minor) |
| 1144 | { |
| 1145 | struct drbd_conf *mdev; |
| 1146 | |
| 1147 | mdev = minor < minor_count ? minor_table[minor] : NULL; |
| 1148 | |
| 1149 | return mdev; |
| 1150 | } |
| 1151 | |
| 1152 | static inline unsigned int mdev_to_minor(struct drbd_conf *mdev) |
| 1153 | { |
| 1154 | return mdev->minor; |
| 1155 | } |
| 1156 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1157 | /* returns 1 if it was successful, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1158 | * returns 0 if there was no data socket. |
| 1159 | * so wherever you are going to use the data.socket, e.g. do |
| 1160 | * if (!drbd_get_data_sock(mdev)) |
| 1161 | * return 0; |
| 1162 | * CODE(); |
| 1163 | * drbd_put_data_sock(mdev); |
| 1164 | */ |
| 1165 | static inline int drbd_get_data_sock(struct drbd_conf *mdev) |
| 1166 | { |
| 1167 | mutex_lock(&mdev->data.mutex); |
| 1168 | /* drbd_disconnect() could have called drbd_free_sock() |
| 1169 | * while we were waiting in down()... */ |
| 1170 | if (unlikely(mdev->data.socket == NULL)) { |
| 1171 | mutex_unlock(&mdev->data.mutex); |
| 1172 | return 0; |
| 1173 | } |
| 1174 | return 1; |
| 1175 | } |
| 1176 | |
| 1177 | static inline void drbd_put_data_sock(struct drbd_conf *mdev) |
| 1178 | { |
| 1179 | mutex_unlock(&mdev->data.mutex); |
| 1180 | } |
| 1181 | |
| 1182 | /* |
| 1183 | * function declarations |
| 1184 | *************************/ |
| 1185 | |
| 1186 | /* drbd_main.c */ |
| 1187 | |
| 1188 | enum chg_state_flags { |
| 1189 | CS_HARD = 1, |
| 1190 | CS_VERBOSE = 2, |
| 1191 | CS_WAIT_COMPLETE = 4, |
| 1192 | CS_SERIALIZE = 8, |
| 1193 | CS_ORDERED = CS_WAIT_COMPLETE + CS_SERIALIZE, |
| 1194 | }; |
| 1195 | |
Philipp Reisner | e89b591 | 2010-03-24 17:11:33 +0100 | [diff] [blame] | 1196 | enum dds_flags { |
| 1197 | DDSF_FORCED = 1, |
| 1198 | DDSF_NO_RESYNC = 2, /* Do not run a resync for the new space */ |
| 1199 | }; |
| 1200 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1201 | extern void drbd_init_set_defaults(struct drbd_conf *mdev); |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1202 | extern enum drbd_state_rv drbd_change_state(struct drbd_conf *mdev, |
| 1203 | enum chg_state_flags f, |
| 1204 | union drbd_state mask, |
| 1205 | union drbd_state val); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1206 | extern void drbd_force_state(struct drbd_conf *, union drbd_state, |
| 1207 | union drbd_state); |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1208 | extern enum drbd_state_rv _drbd_request_state(struct drbd_conf *, |
| 1209 | union drbd_state, |
| 1210 | union drbd_state, |
| 1211 | enum chg_state_flags); |
| 1212 | extern enum drbd_state_rv __drbd_set_state(struct drbd_conf *, union drbd_state, |
| 1213 | enum chg_state_flags, |
| 1214 | struct completion *done); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1215 | extern void print_st_err(struct drbd_conf *, union drbd_state, |
| 1216 | union drbd_state, int); |
| 1217 | extern int drbd_thread_start(struct drbd_thread *thi); |
| 1218 | extern void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait); |
| 1219 | #ifdef CONFIG_SMP |
| 1220 | extern void drbd_thread_current_set_cpu(struct drbd_conf *mdev); |
| 1221 | extern void drbd_calc_cpu_mask(struct drbd_conf *mdev); |
| 1222 | #else |
| 1223 | #define drbd_thread_current_set_cpu(A) ({}) |
| 1224 | #define drbd_calc_cpu_mask(A) ({}) |
| 1225 | #endif |
| 1226 | extern void drbd_free_resources(struct drbd_conf *mdev); |
| 1227 | extern void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr, |
| 1228 | unsigned int set_size); |
| 1229 | extern void tl_clear(struct drbd_conf *mdev); |
| 1230 | extern void _tl_add_barrier(struct drbd_conf *, struct drbd_tl_epoch *); |
| 1231 | extern void drbd_free_sock(struct drbd_conf *mdev); |
| 1232 | extern int drbd_send(struct drbd_conf *mdev, struct socket *sock, |
| 1233 | void *buf, size_t size, unsigned msg_flags); |
| 1234 | extern int drbd_send_protocol(struct drbd_conf *mdev); |
| 1235 | extern int drbd_send_uuids(struct drbd_conf *mdev); |
| 1236 | extern int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev); |
Lars Ellenberg | 5a22db8 | 2010-12-17 21:14:23 +0100 | [diff] [blame] | 1237 | extern int drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev); |
Philipp Reisner | e89b591 | 2010-03-24 17:11:33 +0100 | [diff] [blame] | 1238 | extern int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags); |
Lars Ellenberg | f479ea0 | 2011-10-27 16:52:30 +0200 | [diff] [blame] | 1239 | extern int drbd_send_state(struct drbd_conf *mdev, union drbd_state s); |
| 1240 | extern int drbd_send_current_state(struct drbd_conf *mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1241 | extern int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock, |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 1242 | enum drbd_packets cmd, struct p_header80 *h, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1243 | size_t size, unsigned msg_flags); |
| 1244 | #define USE_DATA_SOCKET 1 |
| 1245 | #define USE_META_SOCKET 0 |
| 1246 | extern int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket, |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 1247 | enum drbd_packets cmd, struct p_header80 *h, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1248 | size_t size); |
| 1249 | extern int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, |
| 1250 | char *data, size_t size); |
| 1251 | extern int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc); |
| 1252 | extern int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, |
| 1253 | u32 set_size); |
| 1254 | extern int drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd, |
| 1255 | struct drbd_epoch_entry *e); |
| 1256 | extern int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd, |
| 1257 | struct p_block_req *rp); |
| 1258 | extern int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd, |
Lars Ellenberg | 2b2bf21 | 2010-10-06 11:46:55 +0200 | [diff] [blame] | 1259 | struct p_data *dp, int data_size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1260 | extern int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd, |
| 1261 | sector_t sector, int blksize, u64 block_id); |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 1262 | extern int drbd_send_oos(struct drbd_conf *mdev, struct drbd_request *req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1263 | extern int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd, |
| 1264 | struct drbd_epoch_entry *e); |
| 1265 | extern int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1266 | extern int drbd_send_drequest(struct drbd_conf *mdev, int cmd, |
| 1267 | sector_t sector, int size, u64 block_id); |
| 1268 | extern int drbd_send_drequest_csum(struct drbd_conf *mdev, |
| 1269 | sector_t sector,int size, |
| 1270 | void *digest, int digest_size, |
| 1271 | enum drbd_packets cmd); |
| 1272 | extern int drbd_send_ov_request(struct drbd_conf *mdev,sector_t sector,int size); |
| 1273 | |
| 1274 | extern int drbd_send_bitmap(struct drbd_conf *mdev); |
| 1275 | extern int _drbd_send_bitmap(struct drbd_conf *mdev); |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1276 | extern int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1277 | extern void drbd_free_bc(struct drbd_backing_dev *ldev); |
| 1278 | extern void drbd_mdev_cleanup(struct drbd_conf *mdev); |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 1279 | void drbd_print_uuids(struct drbd_conf *mdev, const char *text); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1280 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1281 | extern void drbd_md_sync(struct drbd_conf *mdev); |
| 1282 | extern int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1283 | extern void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local); |
| 1284 | extern void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local); |
| 1285 | extern void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local); |
| 1286 | extern void _drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local); |
| 1287 | extern void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local); |
| 1288 | extern void drbd_md_set_flag(struct drbd_conf *mdev, int flags) __must_hold(local); |
| 1289 | extern void drbd_md_clear_flag(struct drbd_conf *mdev, int flags)__must_hold(local); |
| 1290 | extern int drbd_md_test_flag(struct drbd_backing_dev *, int); |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 1291 | #ifndef DRBD_DEBUG_MD_SYNC |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1292 | extern void drbd_md_mark_dirty(struct drbd_conf *mdev); |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 1293 | #else |
| 1294 | #define drbd_md_mark_dirty(m) drbd_md_mark_dirty_(m, __LINE__ , __func__ ) |
| 1295 | extern void drbd_md_mark_dirty_(struct drbd_conf *mdev, |
| 1296 | unsigned int line, const char *func); |
| 1297 | #endif |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1298 | extern void drbd_queue_bitmap_io(struct drbd_conf *mdev, |
| 1299 | int (*io_fn)(struct drbd_conf *), |
| 1300 | void (*done)(struct drbd_conf *, int), |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 1301 | char *why, enum bm_flag flags); |
| 1302 | extern int drbd_bitmap_io(struct drbd_conf *mdev, |
| 1303 | int (*io_fn)(struct drbd_conf *), |
| 1304 | char *why, enum bm_flag flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1305 | extern int drbd_bmio_set_n_write(struct drbd_conf *mdev); |
| 1306 | extern int drbd_bmio_clear_n_write(struct drbd_conf *mdev); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 1307 | extern void drbd_go_diskless(struct drbd_conf *mdev); |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 1308 | extern void drbd_ldev_destroy(struct drbd_conf *mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1309 | |
| 1310 | |
| 1311 | /* Meta data layout |
| 1312 | We reserve a 128MB Block (4k aligned) |
| 1313 | * either at the end of the backing device |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 1314 | * or on a separate meta data device. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1315 | |
| 1316 | #define MD_RESERVED_SECT (128LU << 11) /* 128 MB, unit sectors */ |
| 1317 | /* The following numbers are sectors */ |
| 1318 | #define MD_AL_OFFSET 8 /* 8 Sectors after start of meta area */ |
| 1319 | #define MD_AL_MAX_SIZE 64 /* = 32 kb LOG ~ 3776 extents ~ 14 GB Storage */ |
| 1320 | /* Allows up to about 3.8TB */ |
| 1321 | #define MD_BM_OFFSET (MD_AL_OFFSET + MD_AL_MAX_SIZE) |
| 1322 | |
| 1323 | /* Since the smalles IO unit is usually 512 byte */ |
| 1324 | #define MD_SECTOR_SHIFT 9 |
| 1325 | #define MD_SECTOR_SIZE (1<<MD_SECTOR_SHIFT) |
| 1326 | |
| 1327 | /* activity log */ |
| 1328 | #define AL_EXTENTS_PT ((MD_SECTOR_SIZE-12)/8-1) /* 61 ; Extents per 512B sector */ |
| 1329 | #define AL_EXTENT_SHIFT 22 /* One extent represents 4M Storage */ |
| 1330 | #define AL_EXTENT_SIZE (1<<AL_EXTENT_SHIFT) |
| 1331 | |
| 1332 | #if BITS_PER_LONG == 32 |
| 1333 | #define LN2_BPL 5 |
| 1334 | #define cpu_to_lel(A) cpu_to_le32(A) |
| 1335 | #define lel_to_cpu(A) le32_to_cpu(A) |
| 1336 | #elif BITS_PER_LONG == 64 |
| 1337 | #define LN2_BPL 6 |
| 1338 | #define cpu_to_lel(A) cpu_to_le64(A) |
| 1339 | #define lel_to_cpu(A) le64_to_cpu(A) |
| 1340 | #else |
| 1341 | #error "LN2 of BITS_PER_LONG unknown!" |
| 1342 | #endif |
| 1343 | |
| 1344 | /* resync bitmap */ |
| 1345 | /* 16MB sized 'bitmap extent' to track syncer usage */ |
| 1346 | struct bm_extent { |
| 1347 | int rs_left; /* number of bits set (out of sync) in this extent. */ |
| 1348 | int rs_failed; /* number of failed resync requests in this extent. */ |
| 1349 | unsigned long flags; |
| 1350 | struct lc_element lce; |
| 1351 | }; |
| 1352 | |
| 1353 | #define BME_NO_WRITES 0 /* bm_extent.flags: no more requests on this one! */ |
| 1354 | #define BME_LOCKED 1 /* bm_extent.flags: syncer active on this one. */ |
Philipp Reisner | e3555d8 | 2010-11-07 15:56:29 +0100 | [diff] [blame] | 1355 | #define BME_PRIORITY 2 /* finish resync IO on this extent ASAP! App IO waiting! */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1356 | |
| 1357 | /* drbd_bitmap.c */ |
| 1358 | /* |
| 1359 | * We need to store one bit for a block. |
| 1360 | * Example: 1GB disk @ 4096 byte blocks ==> we need 32 KB bitmap. |
| 1361 | * Bit 0 ==> local node thinks this block is binary identical on both nodes |
| 1362 | * Bit 1 ==> local node thinks this block needs to be synced. |
| 1363 | */ |
| 1364 | |
Philipp Reisner | 8e26f9c | 2010-07-06 17:25:54 +0200 | [diff] [blame] | 1365 | #define SLEEP_TIME (HZ/10) |
| 1366 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1367 | #define BM_BLOCK_SHIFT 12 /* 4k per bit */ |
| 1368 | #define BM_BLOCK_SIZE (1<<BM_BLOCK_SHIFT) |
| 1369 | /* (9+3) : 512 bytes @ 8 bits; representing 16M storage |
| 1370 | * per sector of on disk bitmap */ |
| 1371 | #define BM_EXT_SHIFT (BM_BLOCK_SHIFT + MD_SECTOR_SHIFT + 3) /* = 24 */ |
| 1372 | #define BM_EXT_SIZE (1<<BM_EXT_SHIFT) |
| 1373 | |
| 1374 | #if (BM_EXT_SHIFT != 24) || (BM_BLOCK_SHIFT != 12) |
| 1375 | #error "HAVE YOU FIXED drbdmeta AS WELL??" |
| 1376 | #endif |
| 1377 | |
| 1378 | /* thus many _storage_ sectors are described by one bit */ |
| 1379 | #define BM_SECT_TO_BIT(x) ((x)>>(BM_BLOCK_SHIFT-9)) |
| 1380 | #define BM_BIT_TO_SECT(x) ((sector_t)(x)<<(BM_BLOCK_SHIFT-9)) |
| 1381 | #define BM_SECT_PER_BIT BM_BIT_TO_SECT(1) |
| 1382 | |
| 1383 | /* bit to represented kilo byte conversion */ |
| 1384 | #define Bit2KB(bits) ((bits)<<(BM_BLOCK_SHIFT-10)) |
| 1385 | |
| 1386 | /* in which _bitmap_ extent (resp. sector) the bit for a certain |
| 1387 | * _storage_ sector is located in */ |
| 1388 | #define BM_SECT_TO_EXT(x) ((x)>>(BM_EXT_SHIFT-9)) |
| 1389 | |
| 1390 | /* how much _storage_ sectors we have per bitmap sector */ |
| 1391 | #define BM_EXT_TO_SECT(x) ((sector_t)(x) << (BM_EXT_SHIFT-9)) |
| 1392 | #define BM_SECT_PER_EXT BM_EXT_TO_SECT(1) |
| 1393 | |
| 1394 | /* in one sector of the bitmap, we have this many activity_log extents. */ |
| 1395 | #define AL_EXT_PER_BM_SECT (1 << (BM_EXT_SHIFT - AL_EXTENT_SHIFT)) |
| 1396 | #define BM_WORDS_PER_AL_EXT (1 << (AL_EXTENT_SHIFT-BM_BLOCK_SHIFT-LN2_BPL)) |
| 1397 | |
| 1398 | #define BM_BLOCKS_PER_BM_EXT_B (BM_EXT_SHIFT - BM_BLOCK_SHIFT) |
| 1399 | #define BM_BLOCKS_PER_BM_EXT_MASK ((1<<BM_BLOCKS_PER_BM_EXT_B) - 1) |
| 1400 | |
| 1401 | /* the extent in "PER_EXTENT" below is an activity log extent |
| 1402 | * we need that many (long words/bytes) to store the bitmap |
| 1403 | * of one AL_EXTENT_SIZE chunk of storage. |
| 1404 | * we can store the bitmap for that many AL_EXTENTS within |
| 1405 | * one sector of the _on_disk_ bitmap: |
| 1406 | * bit 0 bit 37 bit 38 bit (512*8)-1 |
| 1407 | * ...|........|........|.. // ..|........| |
| 1408 | * sect. 0 `296 `304 ^(512*8*8)-1 |
| 1409 | * |
| 1410 | #define BM_WORDS_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / BITS_PER_LONG ) |
| 1411 | #define BM_BYTES_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / 8 ) // 128 |
| 1412 | #define BM_EXT_PER_SECT ( 512 / BM_BYTES_PER_EXTENT ) // 4 |
| 1413 | */ |
| 1414 | |
| 1415 | #define DRBD_MAX_SECTORS_32 (0xffffffffLU) |
| 1416 | #define DRBD_MAX_SECTORS_BM \ |
| 1417 | ((MD_RESERVED_SECT - MD_BM_OFFSET) * (1LL<<(BM_EXT_SHIFT-9))) |
| 1418 | #if DRBD_MAX_SECTORS_BM < DRBD_MAX_SECTORS_32 |
| 1419 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_BM |
| 1420 | #define DRBD_MAX_SECTORS_FLEX DRBD_MAX_SECTORS_BM |
Lars Ellenberg | 36bfc7e | 2010-01-05 19:33:54 +0100 | [diff] [blame] | 1421 | #elif !defined(CONFIG_LBDAF) && BITS_PER_LONG == 32 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1422 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_32 |
| 1423 | #define DRBD_MAX_SECTORS_FLEX DRBD_MAX_SECTORS_32 |
| 1424 | #else |
| 1425 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_BM |
| 1426 | /* 16 TB in units of sectors */ |
| 1427 | #if BITS_PER_LONG == 32 |
| 1428 | /* adjust by one page worth of bitmap, |
| 1429 | * so we won't wrap around in drbd_bm_find_next_bit. |
| 1430 | * you should use 64bit OS for that much storage, anyways. */ |
| 1431 | #define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0xffff7fff) |
| 1432 | #else |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1433 | /* we allow up to 1 PiB now on 64bit architecture with "flexible" meta data */ |
| 1434 | #define DRBD_MAX_SECTORS_FLEX (1UL << 51) |
| 1435 | /* corresponds to (1UL << 38) bits right now. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1436 | #endif |
| 1437 | #endif |
| 1438 | |
| 1439 | /* Sector shift value for the "hash" functions of tl_hash and ee_hash tables. |
Philipp Reisner | d537338 | 2010-08-23 15:18:33 +0200 | [diff] [blame] | 1440 | * With a value of 8 all IO in one 128K block make it to the same slot of the |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1441 | * hash table. */ |
Philipp Reisner | d537338 | 2010-08-23 15:18:33 +0200 | [diff] [blame] | 1442 | #define HT_SHIFT 8 |
Lars Ellenberg | 1816a2b | 2010-11-11 15:19:07 +0100 | [diff] [blame] | 1443 | #define DRBD_MAX_BIO_SIZE (1U<<(9+HT_SHIFT)) |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 1444 | #define DRBD_MAX_BIO_SIZE_SAFE (1U << 12) /* Works always = 4k */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1445 | |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 1446 | #define DRBD_MAX_SIZE_H80_PACKET (1U << 15) /* The old header only allows packets up to 32Kib data */ |
Philipp Reisner | d537338 | 2010-08-23 15:18:33 +0200 | [diff] [blame] | 1447 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1448 | /* Number of elements in the app_reads_hash */ |
| 1449 | #define APP_R_HSIZE 15 |
| 1450 | |
| 1451 | extern int drbd_bm_init(struct drbd_conf *mdev); |
Philipp Reisner | 02d9a94 | 2010-03-24 16:23:03 +0100 | [diff] [blame] | 1452 | extern int drbd_bm_resize(struct drbd_conf *mdev, sector_t sectors, int set_new_bits); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1453 | extern void drbd_bm_cleanup(struct drbd_conf *mdev); |
| 1454 | extern void drbd_bm_set_all(struct drbd_conf *mdev); |
| 1455 | extern void drbd_bm_clear_all(struct drbd_conf *mdev); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1456 | /* set/clear/test only a few bits at a time */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1457 | extern int drbd_bm_set_bits( |
| 1458 | struct drbd_conf *mdev, unsigned long s, unsigned long e); |
| 1459 | extern int drbd_bm_clear_bits( |
| 1460 | struct drbd_conf *mdev, unsigned long s, unsigned long e); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1461 | extern int drbd_bm_count_bits( |
| 1462 | struct drbd_conf *mdev, const unsigned long s, const unsigned long e); |
| 1463 | /* bm_set_bits variant for use while holding drbd_bm_lock, |
| 1464 | * may process the whole bitmap in one go */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1465 | extern void _drbd_bm_set_bits(struct drbd_conf *mdev, |
| 1466 | const unsigned long s, const unsigned long e); |
| 1467 | extern int drbd_bm_test_bit(struct drbd_conf *mdev, unsigned long bitnr); |
| 1468 | extern int drbd_bm_e_weight(struct drbd_conf *mdev, unsigned long enr); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1469 | extern int drbd_bm_write_page(struct drbd_conf *mdev, unsigned int idx) __must_hold(local); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1470 | extern int drbd_bm_read(struct drbd_conf *mdev) __must_hold(local); |
| 1471 | extern int drbd_bm_write(struct drbd_conf *mdev) __must_hold(local); |
Philipp Reisner | d1aa4d0 | 2012-08-08 21:19:09 +0200 | [diff] [blame] | 1472 | extern int drbd_bm_write_all(struct drbd_conf *mdev) __must_hold(local); |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 1473 | extern int drbd_bm_write_copy_pages(struct drbd_conf *mdev) __must_hold(local); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1474 | extern unsigned long drbd_bm_ALe_set_all(struct drbd_conf *mdev, |
| 1475 | unsigned long al_enr); |
| 1476 | extern size_t drbd_bm_words(struct drbd_conf *mdev); |
| 1477 | extern unsigned long drbd_bm_bits(struct drbd_conf *mdev); |
| 1478 | extern sector_t drbd_bm_capacity(struct drbd_conf *mdev); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1479 | |
| 1480 | #define DRBD_END_OF_BITMAP (~(unsigned long)0) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1481 | extern unsigned long drbd_bm_find_next(struct drbd_conf *mdev, unsigned long bm_fo); |
| 1482 | /* bm_find_next variants for use while you hold drbd_bm_lock() */ |
| 1483 | extern unsigned long _drbd_bm_find_next(struct drbd_conf *mdev, unsigned long bm_fo); |
| 1484 | extern unsigned long _drbd_bm_find_next_zero(struct drbd_conf *mdev, unsigned long bm_fo); |
Philipp Reisner | 0778286 | 2010-08-31 12:00:50 +0200 | [diff] [blame] | 1485 | extern unsigned long _drbd_bm_total_weight(struct drbd_conf *mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1486 | extern unsigned long drbd_bm_total_weight(struct drbd_conf *mdev); |
| 1487 | extern int drbd_bm_rs_done(struct drbd_conf *mdev); |
| 1488 | /* for receive_bitmap */ |
| 1489 | extern void drbd_bm_merge_lel(struct drbd_conf *mdev, size_t offset, |
| 1490 | size_t number, unsigned long *buffer); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1491 | /* for _drbd_send_bitmap */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1492 | extern void drbd_bm_get_lel(struct drbd_conf *mdev, size_t offset, |
| 1493 | size_t number, unsigned long *buffer); |
| 1494 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 1495 | extern void drbd_bm_lock(struct drbd_conf *mdev, char *why, enum bm_flag flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1496 | extern void drbd_bm_unlock(struct drbd_conf *mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1497 | /* drbd_main.c */ |
| 1498 | |
| 1499 | extern struct kmem_cache *drbd_request_cache; |
| 1500 | extern struct kmem_cache *drbd_ee_cache; /* epoch entries */ |
| 1501 | extern struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ |
| 1502 | extern struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ |
| 1503 | extern mempool_t *drbd_request_mempool; |
| 1504 | extern mempool_t *drbd_ee_mempool; |
| 1505 | |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 1506 | /* drbd's page pool, used to buffer data received from the peer, |
| 1507 | * or data requested by the peer. |
| 1508 | * |
| 1509 | * This does not have an emergency reserve. |
| 1510 | * |
| 1511 | * When allocating from this pool, it first takes pages from the pool. |
| 1512 | * Only if the pool is depleted will try to allocate from the system. |
| 1513 | * |
| 1514 | * The assumption is that pages taken from this pool will be processed, |
| 1515 | * and given back, "quickly", and then can be recycled, so we can avoid |
| 1516 | * frequent calls to alloc_page(), and still will be able to make progress even |
| 1517 | * under memory pressure. |
| 1518 | */ |
| 1519 | extern struct page *drbd_pp_pool; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1520 | extern spinlock_t drbd_pp_lock; |
| 1521 | extern int drbd_pp_vacant; |
| 1522 | extern wait_queue_head_t drbd_pp_wait; |
| 1523 | |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 1524 | /* We also need a standard (emergency-reserve backed) page pool |
| 1525 | * for meta data IO (activity log, bitmap). |
| 1526 | * We can keep it global, as long as it is used as "N pages at a time". |
| 1527 | * 128 should be plenty, currently we probably can get away with as few as 1. |
| 1528 | */ |
| 1529 | #define DRBD_MIN_POOL_PAGES 128 |
| 1530 | extern mempool_t *drbd_md_io_page_pool; |
| 1531 | |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 1532 | /* We also need to make sure we get a bio |
| 1533 | * when we need it for housekeeping purposes */ |
| 1534 | extern struct bio_set *drbd_md_io_bio_set; |
| 1535 | /* to allocate from that set */ |
| 1536 | extern struct bio *bio_alloc_drbd(gfp_t gfp_mask); |
| 1537 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1538 | extern rwlock_t global_state_lock; |
| 1539 | |
| 1540 | extern struct drbd_conf *drbd_new_device(unsigned int minor); |
| 1541 | extern void drbd_free_mdev(struct drbd_conf *mdev); |
| 1542 | |
| 1543 | extern int proc_details; |
| 1544 | |
| 1545 | /* drbd_req */ |
Christoph Hellwig | 5a7bbad | 2011-09-12 12:12:01 +0200 | [diff] [blame] | 1546 | extern void drbd_make_request(struct request_queue *q, struct bio *bio); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1547 | extern int drbd_read_remote(struct drbd_conf *mdev, struct drbd_request *req); |
| 1548 | extern int drbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct bio_vec *bvec); |
| 1549 | extern int is_valid_ar_handle(struct drbd_request *, sector_t); |
| 1550 | |
| 1551 | |
| 1552 | /* drbd_nl.c */ |
| 1553 | extern void drbd_suspend_io(struct drbd_conf *mdev); |
| 1554 | extern void drbd_resume_io(struct drbd_conf *mdev); |
| 1555 | extern char *ppsize(char *buf, unsigned long long size); |
Philipp Reisner | a393db6 | 2009-12-22 13:35:52 +0100 | [diff] [blame] | 1556 | extern sector_t drbd_new_dev_size(struct drbd_conf *, struct drbd_backing_dev *, int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1557 | enum determine_dev_size { dev_size_error = -1, unchanged = 0, shrunk = 1, grew = 2 }; |
Bart Van Assche | 24c4830 | 2011-05-21 18:32:29 +0200 | [diff] [blame] | 1558 | extern enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *, enum dds_flags) __must_hold(local); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1559 | extern void resync_after_online_grow(struct drbd_conf *); |
Philipp Reisner | 99432fc | 2011-05-20 16:39:13 +0200 | [diff] [blame] | 1560 | extern void drbd_reconsider_max_bio_size(struct drbd_conf *mdev); |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1561 | extern enum drbd_state_rv drbd_set_role(struct drbd_conf *mdev, |
| 1562 | enum drbd_role new_role, |
| 1563 | int force); |
Philipp Reisner | 87f7be4 | 2010-06-11 13:56:33 +0200 | [diff] [blame] | 1564 | extern enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev); |
| 1565 | extern void drbd_try_outdate_peer_async(struct drbd_conf *mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1566 | extern int drbd_khelper(struct drbd_conf *mdev, char *cmd); |
| 1567 | |
| 1568 | /* drbd_worker.c */ |
| 1569 | extern int drbd_worker(struct drbd_thread *thi); |
| 1570 | extern int drbd_alter_sa(struct drbd_conf *mdev, int na); |
| 1571 | extern void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side); |
| 1572 | extern void resume_next_sg(struct drbd_conf *mdev); |
| 1573 | extern void suspend_other_sg(struct drbd_conf *mdev); |
| 1574 | extern int drbd_resync_finished(struct drbd_conf *mdev); |
| 1575 | /* maybe rather drbd_main.c ? */ |
Philipp Reisner | e171173 | 2011-06-27 11:51:46 +0200 | [diff] [blame] | 1576 | extern void *drbd_md_get_buffer(struct drbd_conf *mdev); |
| 1577 | extern void drbd_md_put_buffer(struct drbd_conf *mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1578 | extern int drbd_md_sync_page_io(struct drbd_conf *mdev, |
Philipp Reisner | e171173 | 2011-06-27 11:51:46 +0200 | [diff] [blame] | 1579 | struct drbd_backing_dev *bdev, sector_t sector, int rw); |
Philipp Reisner | 7caacb6 | 2011-12-14 18:01:21 +0100 | [diff] [blame] | 1580 | extern void wait_until_done_or_disk_failure(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, |
| 1581 | unsigned int *done); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1582 | extern void drbd_ov_oos_found(struct drbd_conf*, sector_t, int); |
Lars Ellenberg | 9bd28d3 | 2010-11-05 09:55:18 +0100 | [diff] [blame] | 1583 | extern void drbd_rs_controller_reset(struct drbd_conf *mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1584 | |
| 1585 | static inline void ov_oos_print(struct drbd_conf *mdev) |
| 1586 | { |
| 1587 | if (mdev->ov_last_oos_size) { |
| 1588 | dev_err(DEV, "Out of sync: start=%llu, size=%lu (sectors)\n", |
| 1589 | (unsigned long long)mdev->ov_last_oos_start, |
| 1590 | (unsigned long)mdev->ov_last_oos_size); |
| 1591 | } |
| 1592 | mdev->ov_last_oos_size=0; |
| 1593 | } |
| 1594 | |
| 1595 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1596 | extern void drbd_csum_bio(struct drbd_conf *, struct crypto_hash *, struct bio *, void *); |
| 1597 | extern void drbd_csum_ee(struct drbd_conf *, struct crypto_hash *, struct drbd_epoch_entry *, void *); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1598 | /* worker callbacks */ |
| 1599 | extern int w_req_cancel_conflict(struct drbd_conf *, struct drbd_work *, int); |
| 1600 | extern int w_read_retry_remote(struct drbd_conf *, struct drbd_work *, int); |
| 1601 | extern int w_e_end_data_req(struct drbd_conf *, struct drbd_work *, int); |
| 1602 | extern int w_e_end_rsdata_req(struct drbd_conf *, struct drbd_work *, int); |
| 1603 | extern int w_e_end_csum_rs_req(struct drbd_conf *, struct drbd_work *, int); |
| 1604 | extern int w_e_end_ov_reply(struct drbd_conf *, struct drbd_work *, int); |
| 1605 | extern int w_e_end_ov_req(struct drbd_conf *, struct drbd_work *, int); |
| 1606 | extern int w_ov_finished(struct drbd_conf *, struct drbd_work *, int); |
Philipp Reisner | 794abb7 | 2010-12-27 11:51:23 +0100 | [diff] [blame] | 1607 | extern int w_resync_timer(struct drbd_conf *, struct drbd_work *, int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1608 | extern int w_resume_next_sg(struct drbd_conf *, struct drbd_work *, int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1609 | extern int w_send_write_hint(struct drbd_conf *, struct drbd_work *, int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1610 | extern int w_send_dblock(struct drbd_conf *, struct drbd_work *, int); |
| 1611 | extern int w_send_barrier(struct drbd_conf *, struct drbd_work *, int); |
| 1612 | extern int w_send_read_req(struct drbd_conf *, struct drbd_work *, int); |
| 1613 | extern int w_prev_work_done(struct drbd_conf *, struct drbd_work *, int); |
| 1614 | extern int w_e_reissue(struct drbd_conf *, struct drbd_work *, int); |
Philipp Reisner | 265be2d | 2010-05-31 10:14:17 +0200 | [diff] [blame] | 1615 | extern int w_restart_disk_io(struct drbd_conf *, struct drbd_work *, int); |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 1616 | extern int w_send_oos(struct drbd_conf *, struct drbd_work *, int); |
Philipp Reisner | c4752ef | 2010-10-27 17:32:36 +0200 | [diff] [blame] | 1617 | extern int w_start_resync(struct drbd_conf *, struct drbd_work *, int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1618 | |
| 1619 | extern void resync_timer_fn(unsigned long data); |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 1620 | extern void start_resync_timer_fn(unsigned long data); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1621 | |
| 1622 | /* drbd_receiver.c */ |
Philipp Reisner | e3555d8 | 2010-11-07 15:56:29 +0100 | [diff] [blame] | 1623 | extern int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1624 | extern int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, |
| 1625 | const unsigned rw, const int fault_type); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1626 | extern int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list); |
| 1627 | extern struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev, |
| 1628 | u64 id, |
| 1629 | sector_t sector, |
| 1630 | unsigned int data_size, |
| 1631 | gfp_t gfp_mask) __must_hold(local); |
Lars Ellenberg | 435f074 | 2010-09-06 12:30:25 +0200 | [diff] [blame] | 1632 | extern void drbd_free_some_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, |
| 1633 | int is_net); |
| 1634 | #define drbd_free_ee(m,e) drbd_free_some_ee(m, e, 0) |
| 1635 | #define drbd_free_net_ee(m,e) drbd_free_some_ee(m, e, 1) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1636 | extern void drbd_wait_ee_list_empty(struct drbd_conf *mdev, |
| 1637 | struct list_head *head); |
| 1638 | extern void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, |
| 1639 | struct list_head *head); |
| 1640 | extern void drbd_set_recv_tcq(struct drbd_conf *mdev, int tcq_enabled); |
| 1641 | extern void _drbd_clear_done_ee(struct drbd_conf *mdev, struct list_head *to_be_freed); |
| 1642 | extern void drbd_flush_workqueue(struct drbd_conf *mdev); |
Philipp Reisner | f70b3511 | 2010-06-24 14:34:40 +0200 | [diff] [blame] | 1643 | extern void drbd_free_tl_hash(struct drbd_conf *mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1644 | |
| 1645 | /* yes, there is kernel_setsockopt, but only since 2.6.18. we don't need to |
| 1646 | * mess with get_fs/set_fs, we know we are KERNEL_DS always. */ |
| 1647 | static inline int drbd_setsockopt(struct socket *sock, int level, int optname, |
| 1648 | char __user *optval, int optlen) |
| 1649 | { |
| 1650 | int err; |
| 1651 | if (level == SOL_SOCKET) |
| 1652 | err = sock_setsockopt(sock, level, optname, optval, optlen); |
| 1653 | else |
| 1654 | err = sock->ops->setsockopt(sock, level, optname, optval, |
| 1655 | optlen); |
| 1656 | return err; |
| 1657 | } |
| 1658 | |
| 1659 | static inline void drbd_tcp_cork(struct socket *sock) |
| 1660 | { |
| 1661 | int __user val = 1; |
| 1662 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_CORK, |
| 1663 | (char __user *)&val, sizeof(val)); |
| 1664 | } |
| 1665 | |
| 1666 | static inline void drbd_tcp_uncork(struct socket *sock) |
| 1667 | { |
| 1668 | int __user val = 0; |
| 1669 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_CORK, |
| 1670 | (char __user *)&val, sizeof(val)); |
| 1671 | } |
| 1672 | |
| 1673 | static inline void drbd_tcp_nodelay(struct socket *sock) |
| 1674 | { |
| 1675 | int __user val = 1; |
| 1676 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_NODELAY, |
| 1677 | (char __user *)&val, sizeof(val)); |
| 1678 | } |
| 1679 | |
| 1680 | static inline void drbd_tcp_quickack(struct socket *sock) |
| 1681 | { |
Lars Ellenberg | 344fa46 | 2010-05-25 14:23:57 +0200 | [diff] [blame] | 1682 | int __user val = 2; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1683 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_QUICKACK, |
| 1684 | (char __user *)&val, sizeof(val)); |
| 1685 | } |
| 1686 | |
| 1687 | void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo); |
| 1688 | |
| 1689 | /* drbd_proc.c */ |
| 1690 | extern struct proc_dir_entry *drbd_proc; |
Emese Revfy | 7d4e9d0 | 2009-12-14 00:59:30 +0100 | [diff] [blame] | 1691 | extern const struct file_operations drbd_proc_fops; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1692 | extern const char *drbd_conn_str(enum drbd_conns s); |
| 1693 | extern const char *drbd_role_str(enum drbd_role s); |
| 1694 | |
| 1695 | /* drbd_actlog.c */ |
| 1696 | extern void drbd_al_begin_io(struct drbd_conf *mdev, sector_t sector); |
| 1697 | extern void drbd_al_complete_io(struct drbd_conf *mdev, sector_t sector); |
| 1698 | extern void drbd_rs_complete_io(struct drbd_conf *mdev, sector_t sector); |
| 1699 | extern int drbd_rs_begin_io(struct drbd_conf *mdev, sector_t sector); |
| 1700 | extern int drbd_try_rs_begin_io(struct drbd_conf *mdev, sector_t sector); |
| 1701 | extern void drbd_rs_cancel_all(struct drbd_conf *mdev); |
| 1702 | extern int drbd_rs_del_all(struct drbd_conf *mdev); |
| 1703 | extern void drbd_rs_failed_io(struct drbd_conf *mdev, |
| 1704 | sector_t sector, int size); |
| 1705 | extern int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *); |
Lars Ellenberg | ea5442a | 2010-11-05 09:48:01 +0100 | [diff] [blame] | 1706 | extern void drbd_advance_rs_marks(struct drbd_conf *mdev, unsigned long still_to_go); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1707 | extern void __drbd_set_in_sync(struct drbd_conf *mdev, sector_t sector, |
| 1708 | int size, const char *file, const unsigned int line); |
| 1709 | #define drbd_set_in_sync(mdev, sector, size) \ |
| 1710 | __drbd_set_in_sync(mdev, sector, size, __FILE__, __LINE__) |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 1711 | extern int __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1712 | int size, const char *file, const unsigned int line); |
| 1713 | #define drbd_set_out_of_sync(mdev, sector, size) \ |
| 1714 | __drbd_set_out_of_sync(mdev, sector, size, __FILE__, __LINE__) |
| 1715 | extern void drbd_al_apply_to_bm(struct drbd_conf *mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1716 | extern void drbd_al_shrink(struct drbd_conf *mdev); |
| 1717 | |
| 1718 | |
| 1719 | /* drbd_nl.c */ |
| 1720 | |
| 1721 | void drbd_nl_cleanup(void); |
| 1722 | int __init drbd_nl_init(void); |
| 1723 | void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state); |
| 1724 | void drbd_bcast_sync_progress(struct drbd_conf *mdev); |
| 1725 | void drbd_bcast_ee(struct drbd_conf *mdev, |
| 1726 | const char *reason, const int dgs, |
| 1727 | const char* seen_hash, const char* calc_hash, |
| 1728 | const struct drbd_epoch_entry* e); |
| 1729 | |
| 1730 | |
| 1731 | /** |
| 1732 | * DOC: DRBD State macros |
| 1733 | * |
| 1734 | * These macros are used to express state changes in easily readable form. |
| 1735 | * |
| 1736 | * The NS macros expand to a mask and a value, that can be bit ored onto the |
| 1737 | * current state as soon as the spinlock (req_lock) was taken. |
| 1738 | * |
| 1739 | * The _NS macros are used for state functions that get called with the |
| 1740 | * spinlock. These macros expand directly to the new state value. |
| 1741 | * |
| 1742 | * Besides the basic forms NS() and _NS() additional _?NS[23] are defined |
| 1743 | * to express state changes that affect more than one aspect of the state. |
| 1744 | * |
| 1745 | * E.g. NS2(conn, C_CONNECTED, peer, R_SECONDARY) |
| 1746 | * Means that the network connection was established and that the peer |
| 1747 | * is in secondary role. |
| 1748 | */ |
| 1749 | #define role_MASK R_MASK |
| 1750 | #define peer_MASK R_MASK |
| 1751 | #define disk_MASK D_MASK |
| 1752 | #define pdsk_MASK D_MASK |
| 1753 | #define conn_MASK C_MASK |
| 1754 | #define susp_MASK 1 |
| 1755 | #define user_isp_MASK 1 |
| 1756 | #define aftr_isp_MASK 1 |
Philipp Reisner | fb22c40 | 2010-09-08 23:20:21 +0200 | [diff] [blame] | 1757 | #define susp_nod_MASK 1 |
| 1758 | #define susp_fen_MASK 1 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1759 | |
| 1760 | #define NS(T, S) \ |
| 1761 | ({ union drbd_state mask; mask.i = 0; mask.T = T##_MASK; mask; }), \ |
| 1762 | ({ union drbd_state val; val.i = 0; val.T = (S); val; }) |
| 1763 | #define NS2(T1, S1, T2, S2) \ |
| 1764 | ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \ |
| 1765 | mask.T2 = T2##_MASK; mask; }), \ |
| 1766 | ({ union drbd_state val; val.i = 0; val.T1 = (S1); \ |
| 1767 | val.T2 = (S2); val; }) |
| 1768 | #define NS3(T1, S1, T2, S2, T3, S3) \ |
| 1769 | ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \ |
| 1770 | mask.T2 = T2##_MASK; mask.T3 = T3##_MASK; mask; }), \ |
| 1771 | ({ union drbd_state val; val.i = 0; val.T1 = (S1); \ |
| 1772 | val.T2 = (S2); val.T3 = (S3); val; }) |
| 1773 | |
| 1774 | #define _NS(D, T, S) \ |
| 1775 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T = (S); __ns; }) |
| 1776 | #define _NS2(D, T1, S1, T2, S2) \ |
| 1777 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \ |
| 1778 | __ns.T2 = (S2); __ns; }) |
| 1779 | #define _NS3(D, T1, S1, T2, S2, T3, S3) \ |
| 1780 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \ |
| 1781 | __ns.T2 = (S2); __ns.T3 = (S3); __ns; }) |
| 1782 | |
| 1783 | /* |
| 1784 | * inline helper functions |
| 1785 | *************************/ |
| 1786 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1787 | /* see also page_chain_add and friends in drbd_receiver.c */ |
| 1788 | static inline struct page *page_chain_next(struct page *page) |
| 1789 | { |
| 1790 | return (struct page *)page_private(page); |
| 1791 | } |
| 1792 | #define page_chain_for_each(page) \ |
| 1793 | for (; page && ({ prefetch(page_chain_next(page)); 1; }); \ |
| 1794 | page = page_chain_next(page)) |
| 1795 | #define page_chain_for_each_safe(page, n) \ |
| 1796 | for (; page && ({ n = page_chain_next(page); 1; }); page = n) |
| 1797 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1798 | static inline int drbd_ee_has_active_page(struct drbd_epoch_entry *e) |
| 1799 | { |
| 1800 | struct page *page = e->pages; |
| 1801 | page_chain_for_each(page) { |
| 1802 | if (page_count(page) > 1) |
| 1803 | return 1; |
| 1804 | } |
| 1805 | return 0; |
| 1806 | } |
| 1807 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1808 | static inline void drbd_state_lock(struct drbd_conf *mdev) |
| 1809 | { |
| 1810 | wait_event(mdev->misc_wait, |
| 1811 | !test_and_set_bit(CLUSTER_ST_CHANGE, &mdev->flags)); |
| 1812 | } |
| 1813 | |
| 1814 | static inline void drbd_state_unlock(struct drbd_conf *mdev) |
| 1815 | { |
| 1816 | clear_bit(CLUSTER_ST_CHANGE, &mdev->flags); |
| 1817 | wake_up(&mdev->misc_wait); |
| 1818 | } |
| 1819 | |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1820 | static inline enum drbd_state_rv |
| 1821 | _drbd_set_state(struct drbd_conf *mdev, union drbd_state ns, |
| 1822 | enum chg_state_flags flags, struct completion *done) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1823 | { |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1824 | enum drbd_state_rv rv; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1825 | |
| 1826 | read_lock(&global_state_lock); |
| 1827 | rv = __drbd_set_state(mdev, ns, flags, done); |
| 1828 | read_unlock(&global_state_lock); |
| 1829 | |
| 1830 | return rv; |
| 1831 | } |
| 1832 | |
| 1833 | /** |
| 1834 | * drbd_request_state() - Reqest a state change |
| 1835 | * @mdev: DRBD device. |
| 1836 | * @mask: mask of state bits to change. |
| 1837 | * @val: value of new state bits. |
| 1838 | * |
| 1839 | * This is the most graceful way of requesting a state change. It is verbose |
| 1840 | * quite verbose in case the state change is not possible, and all those |
| 1841 | * state changes are globally serialized. |
| 1842 | */ |
| 1843 | static inline int drbd_request_state(struct drbd_conf *mdev, |
| 1844 | union drbd_state mask, |
| 1845 | union drbd_state val) |
| 1846 | { |
| 1847 | return _drbd_request_state(mdev, mask, val, CS_VERBOSE + CS_ORDERED); |
| 1848 | } |
| 1849 | |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1850 | enum drbd_force_detach_flags { |
| 1851 | DRBD_IO_ERROR, |
| 1852 | DRBD_META_IO_ERROR, |
| 1853 | DRBD_FORCE_DETACH, |
| 1854 | }; |
| 1855 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1856 | #define __drbd_chk_io_error(m,f) __drbd_chk_io_error_(m,f, __func__) |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1857 | static inline void __drbd_chk_io_error_(struct drbd_conf *mdev, |
| 1858 | enum drbd_force_detach_flags forcedetach, |
| 1859 | const char *where) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1860 | { |
| 1861 | switch (mdev->ldev->dc.on_io_error) { |
| 1862 | case EP_PASS_ON: |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1863 | if (forcedetach == DRBD_IO_ERROR) { |
Lars Ellenberg | 7383506 | 2010-05-27 11:51:56 +0200 | [diff] [blame] | 1864 | if (__ratelimit(&drbd_ratelimit_state)) |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 1865 | dev_err(DEV, "Local IO failed in %s.\n", where); |
Philipp Reisner | d2e1780 | 2011-03-14 11:54:47 +0100 | [diff] [blame] | 1866 | if (mdev->state.disk > D_INCONSISTENT) |
| 1867 | _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_HARD, NULL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1868 | break; |
| 1869 | } |
| 1870 | /* NOTE fall through to detach case if forcedetach set */ |
| 1871 | case EP_DETACH: |
| 1872 | case EP_CALL_HELPER: |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 1873 | set_bit(WAS_IO_ERROR, &mdev->flags); |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1874 | if (forcedetach == DRBD_FORCE_DETACH) |
| 1875 | set_bit(FORCE_DETACH, &mdev->flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1876 | if (mdev->state.disk > D_FAILED) { |
| 1877 | _drbd_set_state(_NS(mdev, disk, D_FAILED), CS_HARD, NULL); |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 1878 | dev_err(DEV, |
| 1879 | "Local IO failed in %s. Detaching...\n", where); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1880 | } |
| 1881 | break; |
| 1882 | } |
| 1883 | } |
| 1884 | |
| 1885 | /** |
| 1886 | * drbd_chk_io_error: Handle the on_io_error setting, should be called from all io completion handlers |
| 1887 | * @mdev: DRBD device. |
| 1888 | * @error: Error code passed to the IO completion callback |
| 1889 | * @forcedetach: Force detach. I.e. the error happened while accessing the meta data |
| 1890 | * |
| 1891 | * See also drbd_main.c:after_state_ch() if (os.disk > D_FAILED && ns.disk == D_FAILED) |
| 1892 | */ |
| 1893 | #define drbd_chk_io_error(m,e,f) drbd_chk_io_error_(m,e,f, __func__) |
| 1894 | static inline void drbd_chk_io_error_(struct drbd_conf *mdev, |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1895 | int error, enum drbd_force_detach_flags forcedetach, const char *where) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1896 | { |
| 1897 | if (error) { |
| 1898 | unsigned long flags; |
| 1899 | spin_lock_irqsave(&mdev->req_lock, flags); |
| 1900 | __drbd_chk_io_error_(mdev, forcedetach, where); |
| 1901 | spin_unlock_irqrestore(&mdev->req_lock, flags); |
| 1902 | } |
| 1903 | } |
| 1904 | |
| 1905 | |
| 1906 | /** |
| 1907 | * drbd_md_first_sector() - Returns the first sector number of the meta data area |
| 1908 | * @bdev: Meta data block device. |
| 1909 | * |
| 1910 | * BTW, for internal meta data, this happens to be the maximum capacity |
| 1911 | * we could agree upon with our peer node. |
| 1912 | */ |
| 1913 | static inline sector_t drbd_md_first_sector(struct drbd_backing_dev *bdev) |
| 1914 | { |
| 1915 | switch (bdev->dc.meta_dev_idx) { |
| 1916 | case DRBD_MD_INDEX_INTERNAL: |
| 1917 | case DRBD_MD_INDEX_FLEX_INT: |
| 1918 | return bdev->md.md_offset + bdev->md.bm_offset; |
| 1919 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1920 | default: |
| 1921 | return bdev->md.md_offset; |
| 1922 | } |
| 1923 | } |
| 1924 | |
| 1925 | /** |
| 1926 | * drbd_md_last_sector() - Return the last sector number of the meta data area |
| 1927 | * @bdev: Meta data block device. |
| 1928 | */ |
| 1929 | static inline sector_t drbd_md_last_sector(struct drbd_backing_dev *bdev) |
| 1930 | { |
| 1931 | switch (bdev->dc.meta_dev_idx) { |
| 1932 | case DRBD_MD_INDEX_INTERNAL: |
| 1933 | case DRBD_MD_INDEX_FLEX_INT: |
| 1934 | return bdev->md.md_offset + MD_AL_OFFSET - 1; |
| 1935 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1936 | default: |
| 1937 | return bdev->md.md_offset + bdev->md.md_size_sect; |
| 1938 | } |
| 1939 | } |
| 1940 | |
| 1941 | /* Returns the number of 512 byte sectors of the device */ |
| 1942 | static inline sector_t drbd_get_capacity(struct block_device *bdev) |
| 1943 | { |
| 1944 | /* return bdev ? get_capacity(bdev->bd_disk) : 0; */ |
Mike Snitzer | 77304d2 | 2010-11-08 14:39:12 +0100 | [diff] [blame] | 1945 | return bdev ? i_size_read(bdev->bd_inode) >> 9 : 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1946 | } |
| 1947 | |
| 1948 | /** |
| 1949 | * drbd_get_max_capacity() - Returns the capacity we announce to out peer |
| 1950 | * @bdev: Meta data block device. |
| 1951 | * |
| 1952 | * returns the capacity we announce to out peer. we clip ourselves at the |
| 1953 | * various MAX_SECTORS, because if we don't, current implementation will |
| 1954 | * oops sooner or later |
| 1955 | */ |
| 1956 | static inline sector_t drbd_get_max_capacity(struct drbd_backing_dev *bdev) |
| 1957 | { |
| 1958 | sector_t s; |
| 1959 | switch (bdev->dc.meta_dev_idx) { |
| 1960 | case DRBD_MD_INDEX_INTERNAL: |
| 1961 | case DRBD_MD_INDEX_FLEX_INT: |
| 1962 | s = drbd_get_capacity(bdev->backing_bdev) |
| 1963 | ? min_t(sector_t, DRBD_MAX_SECTORS_FLEX, |
| 1964 | drbd_md_first_sector(bdev)) |
| 1965 | : 0; |
| 1966 | break; |
| 1967 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1968 | s = min_t(sector_t, DRBD_MAX_SECTORS_FLEX, |
| 1969 | drbd_get_capacity(bdev->backing_bdev)); |
| 1970 | /* clip at maximum size the meta device can support */ |
| 1971 | s = min_t(sector_t, s, |
| 1972 | BM_EXT_TO_SECT(bdev->md.md_size_sect |
| 1973 | - bdev->md.bm_offset)); |
| 1974 | break; |
| 1975 | default: |
| 1976 | s = min_t(sector_t, DRBD_MAX_SECTORS, |
| 1977 | drbd_get_capacity(bdev->backing_bdev)); |
| 1978 | } |
| 1979 | return s; |
| 1980 | } |
| 1981 | |
| 1982 | /** |
| 1983 | * drbd_md_ss__() - Return the sector number of our meta data super block |
| 1984 | * @mdev: DRBD device. |
| 1985 | * @bdev: Meta data block device. |
| 1986 | */ |
| 1987 | static inline sector_t drbd_md_ss__(struct drbd_conf *mdev, |
| 1988 | struct drbd_backing_dev *bdev) |
| 1989 | { |
| 1990 | switch (bdev->dc.meta_dev_idx) { |
| 1991 | default: /* external, some index */ |
| 1992 | return MD_RESERVED_SECT * bdev->dc.meta_dev_idx; |
| 1993 | case DRBD_MD_INDEX_INTERNAL: |
| 1994 | /* with drbd08, internal meta data is always "flexible" */ |
| 1995 | case DRBD_MD_INDEX_FLEX_INT: |
| 1996 | /* sizeof(struct md_on_disk_07) == 4k |
| 1997 | * position: last 4k aligned block of 4k size */ |
| 1998 | if (!bdev->backing_bdev) { |
| 1999 | if (__ratelimit(&drbd_ratelimit_state)) { |
| 2000 | dev_err(DEV, "bdev->backing_bdev==NULL\n"); |
| 2001 | dump_stack(); |
| 2002 | } |
| 2003 | return 0; |
| 2004 | } |
| 2005 | return (drbd_get_capacity(bdev->backing_bdev) & ~7ULL) |
| 2006 | - MD_AL_OFFSET; |
| 2007 | case DRBD_MD_INDEX_FLEX_EXT: |
| 2008 | return 0; |
| 2009 | } |
| 2010 | } |
| 2011 | |
| 2012 | static inline void |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2013 | drbd_queue_work_front(struct drbd_work_queue *q, struct drbd_work *w) |
| 2014 | { |
| 2015 | unsigned long flags; |
| 2016 | spin_lock_irqsave(&q->q_lock, flags); |
| 2017 | list_add(&w->list, &q->q); |
| 2018 | up(&q->s); /* within the spinlock, |
| 2019 | see comment near end of drbd_worker() */ |
| 2020 | spin_unlock_irqrestore(&q->q_lock, flags); |
| 2021 | } |
| 2022 | |
| 2023 | static inline void |
| 2024 | drbd_queue_work(struct drbd_work_queue *q, struct drbd_work *w) |
| 2025 | { |
| 2026 | unsigned long flags; |
| 2027 | spin_lock_irqsave(&q->q_lock, flags); |
| 2028 | list_add_tail(&w->list, &q->q); |
| 2029 | up(&q->s); /* within the spinlock, |
| 2030 | see comment near end of drbd_worker() */ |
| 2031 | spin_unlock_irqrestore(&q->q_lock, flags); |
| 2032 | } |
| 2033 | |
| 2034 | static inline void wake_asender(struct drbd_conf *mdev) |
| 2035 | { |
| 2036 | if (test_bit(SIGNAL_ASENDER, &mdev->flags)) |
| 2037 | force_sig(DRBD_SIG, mdev->asender.task); |
| 2038 | } |
| 2039 | |
| 2040 | static inline void request_ping(struct drbd_conf *mdev) |
| 2041 | { |
| 2042 | set_bit(SEND_PING, &mdev->flags); |
| 2043 | wake_asender(mdev); |
| 2044 | } |
| 2045 | |
| 2046 | static inline int drbd_send_short_cmd(struct drbd_conf *mdev, |
| 2047 | enum drbd_packets cmd) |
| 2048 | { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 2049 | struct p_header80 h; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2050 | return drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd, &h, sizeof(h)); |
| 2051 | } |
| 2052 | |
| 2053 | static inline int drbd_send_ping(struct drbd_conf *mdev) |
| 2054 | { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 2055 | struct p_header80 h; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2056 | return drbd_send_cmd(mdev, USE_META_SOCKET, P_PING, &h, sizeof(h)); |
| 2057 | } |
| 2058 | |
| 2059 | static inline int drbd_send_ping_ack(struct drbd_conf *mdev) |
| 2060 | { |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 2061 | struct p_header80 h; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2062 | return drbd_send_cmd(mdev, USE_META_SOCKET, P_PING_ACK, &h, sizeof(h)); |
| 2063 | } |
| 2064 | |
| 2065 | static inline void drbd_thread_stop(struct drbd_thread *thi) |
| 2066 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 2067 | _drbd_thread_stop(thi, false, true); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2068 | } |
| 2069 | |
| 2070 | static inline void drbd_thread_stop_nowait(struct drbd_thread *thi) |
| 2071 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 2072 | _drbd_thread_stop(thi, false, false); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2073 | } |
| 2074 | |
| 2075 | static inline void drbd_thread_restart_nowait(struct drbd_thread *thi) |
| 2076 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 2077 | _drbd_thread_stop(thi, true, false); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2078 | } |
| 2079 | |
| 2080 | /* counts how many answer packets packets we expect from our peer, |
| 2081 | * for either explicit application requests, |
| 2082 | * or implicit barrier packets as necessary. |
| 2083 | * increased: |
| 2084 | * w_send_barrier |
| 2085 | * _req_mod(req, queue_for_net_write or queue_for_net_read); |
| 2086 | * it is much easier and equally valid to count what we queue for the |
| 2087 | * worker, even before it actually was queued or send. |
| 2088 | * (drbd_make_request_common; recovery path on read io-error) |
| 2089 | * decreased: |
| 2090 | * got_BarrierAck (respective tl_clear, tl_clear_barrier) |
| 2091 | * _req_mod(req, data_received) |
| 2092 | * [from receive_DataReply] |
| 2093 | * _req_mod(req, write_acked_by_peer or recv_acked_by_peer or neg_acked) |
| 2094 | * [from got_BlockAck (P_WRITE_ACK, P_RECV_ACK)] |
| 2095 | * for some reason it is NOT decreased in got_NegAck, |
| 2096 | * but in the resulting cleanup code from report_params. |
| 2097 | * we should try to remember the reason for that... |
| 2098 | * _req_mod(req, send_failed or send_canceled) |
| 2099 | * _req_mod(req, connection_lost_while_pending) |
| 2100 | * [from tl_clear_barrier] |
| 2101 | */ |
| 2102 | static inline void inc_ap_pending(struct drbd_conf *mdev) |
| 2103 | { |
| 2104 | atomic_inc(&mdev->ap_pending_cnt); |
| 2105 | } |
| 2106 | |
| 2107 | #define ERR_IF_CNT_IS_NEGATIVE(which) \ |
| 2108 | if (atomic_read(&mdev->which) < 0) \ |
| 2109 | dev_err(DEV, "in %s:%d: " #which " = %d < 0 !\n", \ |
| 2110 | __func__ , __LINE__ , \ |
| 2111 | atomic_read(&mdev->which)) |
| 2112 | |
| 2113 | #define dec_ap_pending(mdev) do { \ |
| 2114 | typecheck(struct drbd_conf *, mdev); \ |
| 2115 | if (atomic_dec_and_test(&mdev->ap_pending_cnt)) \ |
| 2116 | wake_up(&mdev->misc_wait); \ |
| 2117 | ERR_IF_CNT_IS_NEGATIVE(ap_pending_cnt); } while (0) |
| 2118 | |
| 2119 | /* counts how many resync-related answers we still expect from the peer |
| 2120 | * increase decrease |
| 2121 | * C_SYNC_TARGET sends P_RS_DATA_REQUEST (and expects P_RS_DATA_REPLY) |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2122 | * C_SYNC_SOURCE sends P_RS_DATA_REPLY (and expects P_WRITE_ACK with ID_SYNCER) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2123 | * (or P_NEG_ACK with ID_SYNCER) |
| 2124 | */ |
| 2125 | static inline void inc_rs_pending(struct drbd_conf *mdev) |
| 2126 | { |
| 2127 | atomic_inc(&mdev->rs_pending_cnt); |
| 2128 | } |
| 2129 | |
| 2130 | #define dec_rs_pending(mdev) do { \ |
| 2131 | typecheck(struct drbd_conf *, mdev); \ |
| 2132 | atomic_dec(&mdev->rs_pending_cnt); \ |
| 2133 | ERR_IF_CNT_IS_NEGATIVE(rs_pending_cnt); } while (0) |
| 2134 | |
| 2135 | /* counts how many answers we still need to send to the peer. |
| 2136 | * increased on |
| 2137 | * receive_Data unless protocol A; |
| 2138 | * we need to send a P_RECV_ACK (proto B) |
| 2139 | * or P_WRITE_ACK (proto C) |
| 2140 | * receive_RSDataReply (recv_resync_read) we need to send a P_WRITE_ACK |
| 2141 | * receive_DataRequest (receive_RSDataRequest) we need to send back P_DATA |
| 2142 | * receive_Barrier_* we need to send a P_BARRIER_ACK |
| 2143 | */ |
| 2144 | static inline void inc_unacked(struct drbd_conf *mdev) |
| 2145 | { |
| 2146 | atomic_inc(&mdev->unacked_cnt); |
| 2147 | } |
| 2148 | |
| 2149 | #define dec_unacked(mdev) do { \ |
| 2150 | typecheck(struct drbd_conf *, mdev); \ |
| 2151 | atomic_dec(&mdev->unacked_cnt); \ |
| 2152 | ERR_IF_CNT_IS_NEGATIVE(unacked_cnt); } while (0) |
| 2153 | |
| 2154 | #define sub_unacked(mdev, n) do { \ |
| 2155 | typecheck(struct drbd_conf *, mdev); \ |
| 2156 | atomic_sub(n, &mdev->unacked_cnt); \ |
| 2157 | ERR_IF_CNT_IS_NEGATIVE(unacked_cnt); } while (0) |
| 2158 | |
| 2159 | |
| 2160 | static inline void put_net_conf(struct drbd_conf *mdev) |
| 2161 | { |
| 2162 | if (atomic_dec_and_test(&mdev->net_cnt)) |
Philipp Reisner | 84dfb9f | 2010-06-23 11:20:05 +0200 | [diff] [blame] | 2163 | wake_up(&mdev->net_cnt_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2164 | } |
| 2165 | |
| 2166 | /** |
| 2167 | * get_net_conf() - Increase ref count on mdev->net_conf; Returns 0 if nothing there |
| 2168 | * @mdev: DRBD device. |
| 2169 | * |
| 2170 | * You have to call put_net_conf() when finished working with mdev->net_conf. |
| 2171 | */ |
| 2172 | static inline int get_net_conf(struct drbd_conf *mdev) |
| 2173 | { |
| 2174 | int have_net_conf; |
| 2175 | |
| 2176 | atomic_inc(&mdev->net_cnt); |
| 2177 | have_net_conf = mdev->state.conn >= C_UNCONNECTED; |
| 2178 | if (!have_net_conf) |
| 2179 | put_net_conf(mdev); |
| 2180 | return have_net_conf; |
| 2181 | } |
| 2182 | |
| 2183 | /** |
| 2184 | * get_ldev() - Increase the ref count on mdev->ldev. Returns 0 if there is no ldev |
| 2185 | * @M: DRBD device. |
| 2186 | * |
| 2187 | * You have to call put_ldev() when finished working with mdev->ldev. |
| 2188 | */ |
| 2189 | #define get_ldev(M) __cond_lock(local, _get_ldev_if_state(M,D_INCONSISTENT)) |
| 2190 | #define get_ldev_if_state(M,MINS) __cond_lock(local, _get_ldev_if_state(M,MINS)) |
| 2191 | |
| 2192 | static inline void put_ldev(struct drbd_conf *mdev) |
| 2193 | { |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 2194 | int i = atomic_dec_return(&mdev->local_cnt); |
Lars Ellenberg | 9a0d9d0 | 2011-05-02 11:51:31 +0200 | [diff] [blame] | 2195 | |
| 2196 | /* This may be called from some endio handler, |
| 2197 | * so we must not sleep here. */ |
| 2198 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2199 | __release(local); |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 2200 | D_ASSERT(i >= 0); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 2201 | if (i == 0) { |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 2202 | if (mdev->state.disk == D_DISKLESS) |
| 2203 | /* even internal references gone, safe to destroy */ |
| 2204 | drbd_ldev_destroy(mdev); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 2205 | if (mdev->state.disk == D_FAILED) |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 2206 | /* all application IO references gone. */ |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 2207 | drbd_go_diskless(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2208 | wake_up(&mdev->misc_wait); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 2209 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2210 | } |
| 2211 | |
| 2212 | #ifndef __CHECKER__ |
| 2213 | static inline int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins) |
| 2214 | { |
| 2215 | int io_allowed; |
| 2216 | |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 2217 | /* never get a reference while D_DISKLESS */ |
| 2218 | if (mdev->state.disk == D_DISKLESS) |
| 2219 | return 0; |
| 2220 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2221 | atomic_inc(&mdev->local_cnt); |
| 2222 | io_allowed = (mdev->state.disk >= mins); |
| 2223 | if (!io_allowed) |
| 2224 | put_ldev(mdev); |
| 2225 | return io_allowed; |
| 2226 | } |
| 2227 | #else |
| 2228 | extern int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins); |
| 2229 | #endif |
| 2230 | |
| 2231 | /* you must have an "get_ldev" reference */ |
| 2232 | static inline void drbd_get_syncer_progress(struct drbd_conf *mdev, |
| 2233 | unsigned long *bits_left, unsigned int *per_mil_done) |
| 2234 | { |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 2235 | /* this is to break it at compile time when we change that, in case we |
| 2236 | * want to support more than (1<<32) bits on a 32bit arch. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2237 | typecheck(unsigned long, mdev->rs_total); |
| 2238 | |
| 2239 | /* note: both rs_total and rs_left are in bits, i.e. in |
| 2240 | * units of BM_BLOCK_SIZE. |
| 2241 | * for the percentage, we don't care. */ |
| 2242 | |
Lars Ellenberg | 439d595 | 2010-11-05 09:52:46 +0100 | [diff] [blame] | 2243 | if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) |
| 2244 | *bits_left = mdev->ov_left; |
| 2245 | else |
| 2246 | *bits_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2247 | /* >> 10 to prevent overflow, |
| 2248 | * +1 to prevent division by zero */ |
| 2249 | if (*bits_left > mdev->rs_total) { |
| 2250 | /* doh. maybe a logic bug somewhere. |
| 2251 | * may also be just a race condition |
| 2252 | * between this and a disconnect during sync. |
| 2253 | * for now, just prevent in-kernel buffer overflow. |
| 2254 | */ |
| 2255 | smp_rmb(); |
| 2256 | dev_warn(DEV, "cs:%s rs_left=%lu > rs_total=%lu (rs_failed %lu)\n", |
| 2257 | drbd_conn_str(mdev->state.conn), |
| 2258 | *bits_left, mdev->rs_total, mdev->rs_failed); |
| 2259 | *per_mil_done = 0; |
| 2260 | } else { |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 2261 | /* Make sure the division happens in long context. |
| 2262 | * We allow up to one petabyte storage right now, |
| 2263 | * at a granularity of 4k per bit that is 2**38 bits. |
| 2264 | * After shift right and multiplication by 1000, |
| 2265 | * this should still fit easily into a 32bit long, |
| 2266 | * so we don't need a 64bit division on 32bit arch. |
| 2267 | * Note: currently we don't support such large bitmaps on 32bit |
| 2268 | * arch anyways, but no harm done to be prepared for it here. |
| 2269 | */ |
David Howells | 5f138ce | 2011-06-15 00:59:04 +0100 | [diff] [blame] | 2270 | unsigned int shift = mdev->rs_total > UINT_MAX ? 16 : 10; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 2271 | unsigned long left = *bits_left >> shift; |
| 2272 | unsigned long total = 1UL + (mdev->rs_total >> shift); |
| 2273 | unsigned long tmp = 1000UL - left * 1000UL/total; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2274 | *per_mil_done = tmp; |
| 2275 | } |
| 2276 | } |
| 2277 | |
| 2278 | |
| 2279 | /* this throttles on-the-fly application requests |
| 2280 | * according to max_buffers settings; |
| 2281 | * maybe re-implement using semaphores? */ |
| 2282 | static inline int drbd_get_max_buffers(struct drbd_conf *mdev) |
| 2283 | { |
| 2284 | int mxb = 1000000; /* arbitrary limit on open requests */ |
| 2285 | if (get_net_conf(mdev)) { |
| 2286 | mxb = mdev->net_conf->max_buffers; |
| 2287 | put_net_conf(mdev); |
| 2288 | } |
| 2289 | return mxb; |
| 2290 | } |
| 2291 | |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2292 | static inline int drbd_state_is_stable(struct drbd_conf *mdev) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2293 | { |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2294 | union drbd_state s = mdev->state; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2295 | |
| 2296 | /* DO NOT add a default clause, we want the compiler to warn us |
| 2297 | * for any newly introduced state we may have forgotten to add here */ |
| 2298 | |
| 2299 | switch ((enum drbd_conns)s.conn) { |
| 2300 | /* new io only accepted when there is no connection, ... */ |
| 2301 | case C_STANDALONE: |
| 2302 | case C_WF_CONNECTION: |
| 2303 | /* ... or there is a well established connection. */ |
| 2304 | case C_CONNECTED: |
| 2305 | case C_SYNC_SOURCE: |
| 2306 | case C_SYNC_TARGET: |
| 2307 | case C_VERIFY_S: |
| 2308 | case C_VERIFY_T: |
| 2309 | case C_PAUSED_SYNC_S: |
| 2310 | case C_PAUSED_SYNC_T: |
Philipp Reisner | 6753171 | 2010-10-27 12:21:30 +0200 | [diff] [blame] | 2311 | case C_AHEAD: |
| 2312 | case C_BEHIND: |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2313 | /* transitional states, IO allowed */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2314 | case C_DISCONNECTING: |
| 2315 | case C_UNCONNECTED: |
| 2316 | case C_TIMEOUT: |
| 2317 | case C_BROKEN_PIPE: |
| 2318 | case C_NETWORK_FAILURE: |
| 2319 | case C_PROTOCOL_ERROR: |
| 2320 | case C_TEAR_DOWN: |
| 2321 | case C_WF_REPORT_PARAMS: |
| 2322 | case C_STARTING_SYNC_S: |
| 2323 | case C_STARTING_SYNC_T: |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2324 | break; |
| 2325 | |
| 2326 | /* Allow IO in BM exchange states with new protocols */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2327 | case C_WF_BITMAP_S: |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2328 | if (mdev->agreed_pro_version < 96) |
| 2329 | return 0; |
| 2330 | break; |
| 2331 | |
| 2332 | /* no new io accepted in these states */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2333 | case C_WF_BITMAP_T: |
| 2334 | case C_WF_SYNC_UUID: |
| 2335 | case C_MASK: |
| 2336 | /* not "stable" */ |
| 2337 | return 0; |
| 2338 | } |
| 2339 | |
| 2340 | switch ((enum drbd_disk_state)s.disk) { |
| 2341 | case D_DISKLESS: |
| 2342 | case D_INCONSISTENT: |
| 2343 | case D_OUTDATED: |
| 2344 | case D_CONSISTENT: |
| 2345 | case D_UP_TO_DATE: |
Philipp Reisner | 5ca1de0 | 2011-06-28 17:01:19 +0200 | [diff] [blame] | 2346 | case D_FAILED: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2347 | /* disk state is stable as well. */ |
| 2348 | break; |
| 2349 | |
| 2350 | /* no new io accepted during tansitional states */ |
| 2351 | case D_ATTACHING: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2352 | case D_NEGOTIATING: |
| 2353 | case D_UNKNOWN: |
| 2354 | case D_MASK: |
| 2355 | /* not "stable" */ |
| 2356 | return 0; |
| 2357 | } |
| 2358 | |
| 2359 | return 1; |
| 2360 | } |
| 2361 | |
Philipp Reisner | fb22c40 | 2010-09-08 23:20:21 +0200 | [diff] [blame] | 2362 | static inline int is_susp(union drbd_state s) |
| 2363 | { |
| 2364 | return s.susp || s.susp_nod || s.susp_fen; |
| 2365 | } |
| 2366 | |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2367 | static inline bool may_inc_ap_bio(struct drbd_conf *mdev) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2368 | { |
| 2369 | int mxb = drbd_get_max_buffers(mdev); |
| 2370 | |
Philipp Reisner | fb22c40 | 2010-09-08 23:20:21 +0200 | [diff] [blame] | 2371 | if (is_susp(mdev->state)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2372 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2373 | if (test_bit(SUSPEND_IO, &mdev->flags)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2374 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2375 | |
| 2376 | /* to avoid potential deadlock or bitmap corruption, |
| 2377 | * in various places, we only allow new application io |
| 2378 | * to start during "stable" states. */ |
| 2379 | |
| 2380 | /* no new io accepted when attaching or detaching the disk */ |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2381 | if (!drbd_state_is_stable(mdev)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2382 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2383 | |
| 2384 | /* since some older kernels don't have atomic_add_unless, |
| 2385 | * and we are within the spinlock anyways, we have this workaround. */ |
| 2386 | if (atomic_read(&mdev->ap_bio_cnt) > mxb) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2387 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2388 | if (test_bit(BITMAP_IO, &mdev->flags)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2389 | return false; |
| 2390 | return true; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2391 | } |
| 2392 | |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2393 | static inline bool inc_ap_bio_cond(struct drbd_conf *mdev, int count) |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2394 | { |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2395 | bool rv = false; |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2396 | |
| 2397 | spin_lock_irq(&mdev->req_lock); |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2398 | rv = may_inc_ap_bio(mdev); |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2399 | if (rv) |
| 2400 | atomic_add(count, &mdev->ap_bio_cnt); |
| 2401 | spin_unlock_irq(&mdev->req_lock); |
| 2402 | |
| 2403 | return rv; |
| 2404 | } |
| 2405 | |
Philipp Reisner | 9a25a04 | 2010-05-10 16:42:23 +0200 | [diff] [blame] | 2406 | static inline void inc_ap_bio(struct drbd_conf *mdev, int count) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2407 | { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2408 | /* we wait here |
| 2409 | * as long as the device is suspended |
| 2410 | * until the bitmap is no longer on the fly during connection |
| 2411 | * handshake as long as we would exeed the max_buffer limit. |
| 2412 | * |
| 2413 | * to avoid races with the reconnect code, |
| 2414 | * we need to atomic_inc within the spinlock. */ |
| 2415 | |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2416 | wait_event(mdev->misc_wait, inc_ap_bio_cond(mdev, count)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2417 | } |
| 2418 | |
| 2419 | static inline void dec_ap_bio(struct drbd_conf *mdev) |
| 2420 | { |
| 2421 | int mxb = drbd_get_max_buffers(mdev); |
| 2422 | int ap_bio = atomic_dec_return(&mdev->ap_bio_cnt); |
| 2423 | |
| 2424 | D_ASSERT(ap_bio >= 0); |
Lars Ellenberg | 7ee1fb9 | 2012-06-19 10:27:58 +0200 | [diff] [blame] | 2425 | |
| 2426 | if (ap_bio == 0 && test_bit(BITMAP_IO, &mdev->flags)) { |
| 2427 | if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags)) |
| 2428 | drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w); |
| 2429 | } |
| 2430 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2431 | /* this currently does wake_up for every dec_ap_bio! |
| 2432 | * maybe rather introduce some type of hysteresis? |
| 2433 | * e.g. (ap_bio == mxb/2 || ap_bio == 0) ? */ |
| 2434 | if (ap_bio < mxb) |
| 2435 | wake_up(&mdev->misc_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2436 | } |
| 2437 | |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 2438 | static inline int drbd_set_ed_uuid(struct drbd_conf *mdev, u64 val) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2439 | { |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 2440 | int changed = mdev->ed_uuid != val; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2441 | mdev->ed_uuid = val; |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 2442 | return changed; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2443 | } |
| 2444 | |
| 2445 | static inline int seq_cmp(u32 a, u32 b) |
| 2446 | { |
| 2447 | /* we assume wrap around at 32bit. |
| 2448 | * for wrap around at 24bit (old atomic_t), |
| 2449 | * we'd have to |
| 2450 | * a <<= 8; b <<= 8; |
| 2451 | */ |
| 2452 | return (s32)(a) - (s32)(b); |
| 2453 | } |
| 2454 | #define seq_lt(a, b) (seq_cmp((a), (b)) < 0) |
| 2455 | #define seq_gt(a, b) (seq_cmp((a), (b)) > 0) |
| 2456 | #define seq_ge(a, b) (seq_cmp((a), (b)) >= 0) |
| 2457 | #define seq_le(a, b) (seq_cmp((a), (b)) <= 0) |
| 2458 | /* CAUTION: please no side effects in arguments! */ |
| 2459 | #define seq_max(a, b) ((u32)(seq_gt((a), (b)) ? (a) : (b))) |
| 2460 | |
| 2461 | static inline void update_peer_seq(struct drbd_conf *mdev, unsigned int new_seq) |
| 2462 | { |
| 2463 | unsigned int m; |
| 2464 | spin_lock(&mdev->peer_seq_lock); |
| 2465 | m = seq_max(mdev->peer_seq, new_seq); |
| 2466 | mdev->peer_seq = m; |
| 2467 | spin_unlock(&mdev->peer_seq_lock); |
| 2468 | if (m == new_seq) |
| 2469 | wake_up(&mdev->seq_wait); |
| 2470 | } |
| 2471 | |
| 2472 | static inline void drbd_update_congested(struct drbd_conf *mdev) |
| 2473 | { |
| 2474 | struct sock *sk = mdev->data.socket->sk; |
| 2475 | if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5) |
| 2476 | set_bit(NET_CONGESTED, &mdev->flags); |
| 2477 | } |
| 2478 | |
| 2479 | static inline int drbd_queue_order_type(struct drbd_conf *mdev) |
| 2480 | { |
| 2481 | /* sorry, we currently have no working implementation |
| 2482 | * of distributed TCQ stuff */ |
| 2483 | #ifndef QUEUE_ORDERED_NONE |
| 2484 | #define QUEUE_ORDERED_NONE 0 |
| 2485 | #endif |
| 2486 | return QUEUE_ORDERED_NONE; |
| 2487 | } |
| 2488 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2489 | static inline void drbd_md_flush(struct drbd_conf *mdev) |
| 2490 | { |
| 2491 | int r; |
| 2492 | |
Philipp Reisner | a8a4e51 | 2010-08-25 10:21:04 +0200 | [diff] [blame] | 2493 | if (test_bit(MD_NO_FUA, &mdev->flags)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2494 | return; |
| 2495 | |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 2496 | r = blkdev_issue_flush(mdev->ldev->md_bdev, GFP_KERNEL, NULL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2497 | if (r) { |
Philipp Reisner | a8a4e51 | 2010-08-25 10:21:04 +0200 | [diff] [blame] | 2498 | set_bit(MD_NO_FUA, &mdev->flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2499 | dev_err(DEV, "meta data flush failed with status %d, disabling md-flushes\n", r); |
| 2500 | } |
| 2501 | } |
| 2502 | |
| 2503 | #endif |