1 /* 2 drbd_nl.c 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 #include <linux/module.h> 27 #include <linux/drbd.h> 28 #include <linux/in.h> 29 #include <linux/fs.h> 30 #include <linux/file.h> 31 #include <linux/slab.h> 32 #include <linux/connector.h> 33 #include <linux/blkpg.h> 34 #include <linux/cpumask.h> 35 #include "drbd_int.h" 36 #include "drbd_req.h" 37 #include "drbd_wrappers.h" 38 #include <asm/unaligned.h> 39 #include <linux/drbd_tag_magic.h> 40 #include <linux/drbd_limits.h> 41 #include <linux/compiler.h> 42 #include <linux/kthread.h> 43 44 static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int); 45 static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *); 46 static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *); 47 48 /* see get_sb_bdev and bd_claim */ 49 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device."; 50 51 /* Generate the tag_list to struct functions */ 52 #define NL_PACKET(name, number, fields) \ 53 static int name ## _from_tags(struct drbd_conf *mdev, \ 54 unsigned short *tags, struct name *arg) __attribute__ ((unused)); \ 55 static int name ## _from_tags(struct drbd_conf *mdev, \ 56 unsigned short *tags, struct name *arg) \ 57 { \ 58 int tag; \ 59 int dlen; \ 60 \ 61 while ((tag = get_unaligned(tags++)) != TT_END) { \ 62 dlen = get_unaligned(tags++); \ 63 switch (tag_number(tag)) { \ 64 fields \ 65 default: \ 66 if (tag & T_MANDATORY) { \ 67 dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \ 68 return 0; \ 69 } \ 70 } \ 71 tags = (unsigned short *)((char *)tags + dlen); \ 72 } \ 73 return 1; \ 74 } 75 #define NL_INTEGER(pn, pr, member) \ 76 case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \ 77 arg->member = get_unaligned((int *)(tags)); \ 78 break; 79 #define NL_INT64(pn, pr, member) \ 80 case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \ 81 arg->member = get_unaligned((u64 *)(tags)); \ 82 break; 83 #define NL_BIT(pn, pr, member) \ 84 case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \ 85 arg->member = *(char *)(tags) ? 1 : 0; \ 86 break; 87 #define NL_STRING(pn, pr, member, len) \ 88 case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \ 89 if (dlen > len) { \ 90 dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \ 91 #member, dlen, (unsigned int)len); \ 92 return 0; \ 93 } \ 94 arg->member ## _len = dlen; \ 95 memcpy(arg->member, tags, min_t(size_t, dlen, len)); \ 96 break; 97 #include "linux/drbd_nl.h" 98 99 /* Generate the struct to tag_list functions */ 100 #define NL_PACKET(name, number, fields) \ 101 static unsigned short* \ 102 name ## _to_tags(struct drbd_conf *mdev, \ 103 struct name *arg, unsigned short *tags) __attribute__ ((unused)); \ 104 static unsigned short* \ 105 name ## _to_tags(struct drbd_conf *mdev, \ 106 struct name *arg, unsigned short *tags) \ 107 { \ 108 fields \ 109 return tags; \ 110 } 111 112 #define NL_INTEGER(pn, pr, member) \ 113 put_unaligned(pn | pr | TT_INTEGER, tags++); \ 114 put_unaligned(sizeof(int), tags++); \ 115 put_unaligned(arg->member, (int *)tags); \ 116 tags = (unsigned short *)((char *)tags+sizeof(int)); 117 #define NL_INT64(pn, pr, member) \ 118 put_unaligned(pn | pr | TT_INT64, tags++); \ 119 put_unaligned(sizeof(u64), tags++); \ 120 put_unaligned(arg->member, (u64 *)tags); \ 121 tags = (unsigned short *)((char *)tags+sizeof(u64)); 122 #define NL_BIT(pn, pr, member) \ 123 put_unaligned(pn | pr | TT_BIT, tags++); \ 124 put_unaligned(sizeof(char), tags++); \ 125 *(char *)tags = arg->member; \ 126 tags = (unsigned short *)((char *)tags+sizeof(char)); 127 #define NL_STRING(pn, pr, member, len) \ 128 put_unaligned(pn | pr | TT_STRING, tags++); \ 129 put_unaligned(arg->member ## _len, tags++); \ 130 memcpy(tags, arg->member, arg->member ## _len); \ 131 tags = (unsigned short *)((char *)tags + arg->member ## _len); 132 #include "linux/drbd_nl.h" 133 134 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name); 135 void drbd_nl_send_reply(struct cn_msg *, int); 136 137 int drbd_khelper(struct drbd_conf *mdev, char *cmd) 138 { 139 char *envp[] = { "HOME=/", 140 "TERM=linux", 141 "PATH=/sbin:/usr/sbin:/bin:/usr/bin", 142 NULL, /* Will be set to address family */ 143 NULL, /* Will be set to address */ 144 NULL }; 145 146 char mb[12], af[20], ad[60], *afs; 147 char *argv[] = {usermode_helper, cmd, mb, NULL }; 148 int ret; 149 150 snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev)); 151 152 if (get_net_conf(mdev)) { 153 switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) { 154 case AF_INET6: 155 afs = "ipv6"; 156 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6", 157 &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr); 158 break; 159 case AF_INET: 160 afs = "ipv4"; 161 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4", 162 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr); 163 break; 164 default: 165 afs = "ssocks"; 166 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4", 167 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr); 168 } 169 snprintf(af, 20, "DRBD_PEER_AF=%s", afs); 170 envp[3]=af; 171 envp[4]=ad; 172 put_net_conf(mdev); 173 } 174 175 /* The helper may take some time. 176 * write out any unsynced meta data changes now */ 177 drbd_md_sync(mdev); 178 179 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb); 180 181 drbd_bcast_ev_helper(mdev, cmd); 182 ret = call_usermodehelper(usermode_helper, argv, envp, 1); 183 if (ret) 184 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n", 185 usermode_helper, cmd, mb, 186 (ret >> 8) & 0xff, ret); 187 else 188 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n", 189 usermode_helper, cmd, mb, 190 (ret >> 8) & 0xff, ret); 191 192 if (ret < 0) /* Ignore any ERRNOs we got. */ 193 ret = 0; 194 195 return ret; 196 } 197 198 enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev) 199 { 200 char *ex_to_string; 201 int r; 202 enum drbd_disk_state nps; 203 enum drbd_fencing_p fp; 204 205 D_ASSERT(mdev->state.pdsk == D_UNKNOWN); 206 207 if (get_ldev_if_state(mdev, D_CONSISTENT)) { 208 fp = mdev->ldev->dc.fencing; 209 put_ldev(mdev); 210 } else { 211 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n"); 212 nps = mdev->state.pdsk; 213 goto out; 214 } 215 216 r = drbd_khelper(mdev, "fence-peer"); 217 218 switch ((r>>8) & 0xff) { 219 case 3: /* peer is inconsistent */ 220 ex_to_string = "peer is inconsistent or worse"; 221 nps = D_INCONSISTENT; 222 break; 223 case 4: /* peer got outdated, or was already outdated */ 224 ex_to_string = "peer was fenced"; 225 nps = D_OUTDATED; 226 break; 227 case 5: /* peer was down */ 228 if (mdev->state.disk == D_UP_TO_DATE) { 229 /* we will(have) create(d) a new UUID anyways... */ 230 ex_to_string = "peer is unreachable, assumed to be dead"; 231 nps = D_OUTDATED; 232 } else { 233 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate"; 234 nps = mdev->state.pdsk; 235 } 236 break; 237 case 6: /* Peer is primary, voluntarily outdate myself. 238 * This is useful when an unconnected R_SECONDARY is asked to 239 * become R_PRIMARY, but finds the other peer being active. */ 240 ex_to_string = "peer is active"; 241 dev_warn(DEV, "Peer is primary, outdating myself.\n"); 242 nps = D_UNKNOWN; 243 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE); 244 break; 245 case 7: 246 if (fp != FP_STONITH) 247 dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n"); 248 ex_to_string = "peer was stonithed"; 249 nps = D_OUTDATED; 250 break; 251 default: 252 /* The script is broken ... */ 253 nps = D_UNKNOWN; 254 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff); 255 return nps; 256 } 257 258 dev_info(DEV, "fence-peer helper returned %d (%s)\n", 259 (r>>8) & 0xff, ex_to_string); 260 261 out: 262 if (mdev->state.susp_fen && nps >= D_UNKNOWN) { 263 /* The handler was not successful... unfreeze here, the 264 state engine can not unfreeze... */ 265 _drbd_request_state(mdev, NS(susp_fen, 0), CS_VERBOSE); 266 } 267 268 return nps; 269 } 270 271 static int _try_outdate_peer_async(void *data) 272 { 273 struct drbd_conf *mdev = (struct drbd_conf *)data; 274 enum drbd_disk_state nps; 275 276 nps = drbd_try_outdate_peer(mdev); 277 drbd_request_state(mdev, NS(pdsk, nps)); 278 279 return 0; 280 } 281 282 void drbd_try_outdate_peer_async(struct drbd_conf *mdev) 283 { 284 struct task_struct *opa; 285 286 opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev)); 287 if (IS_ERR(opa)) 288 dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n"); 289 } 290 291 int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force) 292 { 293 const int max_tries = 4; 294 int r = 0; 295 int try = 0; 296 int forced = 0; 297 union drbd_state mask, val; 298 enum drbd_disk_state nps; 299 300 if (new_role == R_PRIMARY) 301 request_ping(mdev); /* Detect a dead peer ASAP */ 302 303 mutex_lock(&mdev->state_mutex); 304 305 mask.i = 0; mask.role = R_MASK; 306 val.i = 0; val.role = new_role; 307 308 while (try++ < max_tries) { 309 r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE); 310 311 /* in case we first succeeded to outdate, 312 * but now suddenly could establish a connection */ 313 if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) { 314 val.pdsk = 0; 315 mask.pdsk = 0; 316 continue; 317 } 318 319 if (r == SS_NO_UP_TO_DATE_DISK && force && 320 (mdev->state.disk < D_UP_TO_DATE && 321 mdev->state.disk >= D_INCONSISTENT)) { 322 mask.disk = D_MASK; 323 val.disk = D_UP_TO_DATE; 324 forced = 1; 325 continue; 326 } 327 328 if (r == SS_NO_UP_TO_DATE_DISK && 329 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) { 330 D_ASSERT(mdev->state.pdsk == D_UNKNOWN); 331 nps = drbd_try_outdate_peer(mdev); 332 333 if (nps == D_OUTDATED || nps == D_INCONSISTENT) { 334 val.disk = D_UP_TO_DATE; 335 mask.disk = D_MASK; 336 } 337 338 val.pdsk = nps; 339 mask.pdsk = D_MASK; 340 341 continue; 342 } 343 344 if (r == SS_NOTHING_TO_DO) 345 goto fail; 346 if (r == SS_PRIMARY_NOP && mask.pdsk == 0) { 347 nps = drbd_try_outdate_peer(mdev); 348 349 if (force && nps > D_OUTDATED) { 350 dev_warn(DEV, "Forced into split brain situation!\n"); 351 nps = D_OUTDATED; 352 } 353 354 mask.pdsk = D_MASK; 355 val.pdsk = nps; 356 357 continue; 358 } 359 if (r == SS_TWO_PRIMARIES) { 360 /* Maybe the peer is detected as dead very soon... 361 retry at most once more in this case. */ 362 __set_current_state(TASK_INTERRUPTIBLE); 363 schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10); 364 if (try < max_tries) 365 try = max_tries - 1; 366 continue; 367 } 368 if (r < SS_SUCCESS) { 369 r = _drbd_request_state(mdev, mask, val, 370 CS_VERBOSE + CS_WAIT_COMPLETE); 371 if (r < SS_SUCCESS) 372 goto fail; 373 } 374 break; 375 } 376 377 if (r < SS_SUCCESS) 378 goto fail; 379 380 if (forced) 381 dev_warn(DEV, "Forced to consider local data as UpToDate!\n"); 382 383 /* Wait until nothing is on the fly :) */ 384 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0); 385 386 if (new_role == R_SECONDARY) { 387 set_disk_ro(mdev->vdisk, TRUE); 388 if (get_ldev(mdev)) { 389 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; 390 put_ldev(mdev); 391 } 392 } else { 393 if (get_net_conf(mdev)) { 394 mdev->net_conf->want_lose = 0; 395 put_net_conf(mdev); 396 } 397 set_disk_ro(mdev->vdisk, FALSE); 398 if (get_ldev(mdev)) { 399 if (((mdev->state.conn < C_CONNECTED || 400 mdev->state.pdsk <= D_FAILED) 401 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced) 402 drbd_uuid_new_current(mdev); 403 404 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1; 405 put_ldev(mdev); 406 } 407 } 408 409 if ((new_role == R_SECONDARY) && get_ldev(mdev)) { 410 drbd_al_to_on_disk_bm(mdev); 411 put_ldev(mdev); 412 } 413 414 if (mdev->state.conn >= C_WF_REPORT_PARAMS) { 415 /* if this was forced, we should consider sync */ 416 if (forced) 417 drbd_send_uuids(mdev); 418 drbd_send_state(mdev); 419 } 420 421 drbd_md_sync(mdev); 422 423 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 424 fail: 425 mutex_unlock(&mdev->state_mutex); 426 return r; 427 } 428 429 static struct drbd_conf *ensure_mdev(int minor, int create) 430 { 431 struct drbd_conf *mdev; 432 433 if (minor >= minor_count) 434 return NULL; 435 436 mdev = minor_to_mdev(minor); 437 438 if (!mdev && create) { 439 struct gendisk *disk = NULL; 440 mdev = drbd_new_device(minor); 441 442 spin_lock_irq(&drbd_pp_lock); 443 if (minor_table[minor] == NULL) { 444 minor_table[minor] = mdev; 445 disk = mdev->vdisk; 446 mdev = NULL; 447 } /* else: we lost the race */ 448 spin_unlock_irq(&drbd_pp_lock); 449 450 if (disk) /* we won the race above */ 451 /* in case we ever add a drbd_delete_device(), 452 * don't forget the del_gendisk! */ 453 add_disk(disk); 454 else /* we lost the race above */ 455 drbd_free_mdev(mdev); 456 457 mdev = minor_to_mdev(minor); 458 } 459 460 return mdev; 461 } 462 463 static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 464 struct drbd_nl_cfg_reply *reply) 465 { 466 struct primary primary_args; 467 468 memset(&primary_args, 0, sizeof(struct primary)); 469 if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) { 470 reply->ret_code = ERR_MANDATORY_TAG; 471 return 0; 472 } 473 474 reply->ret_code = 475 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force); 476 477 return 0; 478 } 479 480 static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 481 struct drbd_nl_cfg_reply *reply) 482 { 483 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0); 484 485 return 0; 486 } 487 488 /* initializes the md.*_offset members, so we are able to find 489 * the on disk meta data */ 490 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev, 491 struct drbd_backing_dev *bdev) 492 { 493 sector_t md_size_sect = 0; 494 switch (bdev->dc.meta_dev_idx) { 495 default: 496 /* v07 style fixed size indexed meta data */ 497 bdev->md.md_size_sect = MD_RESERVED_SECT; 498 bdev->md.md_offset = drbd_md_ss__(mdev, bdev); 499 bdev->md.al_offset = MD_AL_OFFSET; 500 bdev->md.bm_offset = MD_BM_OFFSET; 501 break; 502 case DRBD_MD_INDEX_FLEX_EXT: 503 /* just occupy the full device; unit: sectors */ 504 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev); 505 bdev->md.md_offset = 0; 506 bdev->md.al_offset = MD_AL_OFFSET; 507 bdev->md.bm_offset = MD_BM_OFFSET; 508 break; 509 case DRBD_MD_INDEX_INTERNAL: 510 case DRBD_MD_INDEX_FLEX_INT: 511 bdev->md.md_offset = drbd_md_ss__(mdev, bdev); 512 /* al size is still fixed */ 513 bdev->md.al_offset = -MD_AL_MAX_SIZE; 514 /* we need (slightly less than) ~ this much bitmap sectors: */ 515 md_size_sect = drbd_get_capacity(bdev->backing_bdev); 516 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT); 517 md_size_sect = BM_SECT_TO_EXT(md_size_sect); 518 md_size_sect = ALIGN(md_size_sect, 8); 519 520 /* plus the "drbd meta data super block", 521 * and the activity log; */ 522 md_size_sect += MD_BM_OFFSET; 523 524 bdev->md.md_size_sect = md_size_sect; 525 /* bitmap offset is adjusted by 'super' block size */ 526 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET; 527 break; 528 } 529 } 530 531 char *ppsize(char *buf, unsigned long long size) 532 { 533 /* Needs 9 bytes at max. */ 534 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' }; 535 int base = 0; 536 while (size >= 10000) { 537 /* shift + round */ 538 size = (size >> 10) + !!(size & (1<<9)); 539 base++; 540 } 541 sprintf(buf, "%lu %cB", (long)size, units[base]); 542 543 return buf; 544 } 545 546 /* there is still a theoretical deadlock when called from receiver 547 * on an D_INCONSISTENT R_PRIMARY: 548 * remote READ does inc_ap_bio, receiver would need to receive answer 549 * packet from remote to dec_ap_bio again. 550 * receiver receive_sizes(), comes here, 551 * waits for ap_bio_cnt == 0. -> deadlock. 552 * but this cannot happen, actually, because: 553 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable 554 * (not connected, or bad/no disk on peer): 555 * see drbd_fail_request_early, ap_bio_cnt is zero. 556 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET: 557 * peer may not initiate a resize. 558 */ 559 void drbd_suspend_io(struct drbd_conf *mdev) 560 { 561 set_bit(SUSPEND_IO, &mdev->flags); 562 if (is_susp(mdev->state)) 563 return; 564 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); 565 } 566 567 void drbd_resume_io(struct drbd_conf *mdev) 568 { 569 clear_bit(SUSPEND_IO, &mdev->flags); 570 wake_up(&mdev->misc_wait); 571 } 572 573 /** 574 * drbd_determine_dev_size() - Sets the right device size obeying all constraints 575 * @mdev: DRBD device. 576 * 577 * Returns 0 on success, negative return values indicate errors. 578 * You should call drbd_md_sync() after calling this function. 579 */ 580 enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local) 581 { 582 sector_t prev_first_sect, prev_size; /* previous meta location */ 583 sector_t la_size; 584 sector_t size; 585 char ppb[10]; 586 587 int md_moved, la_size_changed; 588 enum determine_dev_size rv = unchanged; 589 590 /* race: 591 * application request passes inc_ap_bio, 592 * but then cannot get an AL-reference. 593 * this function later may wait on ap_bio_cnt == 0. -> deadlock. 594 * 595 * to avoid that: 596 * Suspend IO right here. 597 * still lock the act_log to not trigger ASSERTs there. 598 */ 599 drbd_suspend_io(mdev); 600 601 /* no wait necessary anymore, actually we could assert that */ 602 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); 603 604 prev_first_sect = drbd_md_first_sector(mdev->ldev); 605 prev_size = mdev->ldev->md.md_size_sect; 606 la_size = mdev->ldev->md.la_size_sect; 607 608 /* TODO: should only be some assert here, not (re)init... */ 609 drbd_md_set_sector_offsets(mdev, mdev->ldev); 610 611 size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED); 612 613 if (drbd_get_capacity(mdev->this_bdev) != size || 614 drbd_bm_capacity(mdev) != size) { 615 int err; 616 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC)); 617 if (unlikely(err)) { 618 /* currently there is only one error: ENOMEM! */ 619 size = drbd_bm_capacity(mdev)>>1; 620 if (size == 0) { 621 dev_err(DEV, "OUT OF MEMORY! " 622 "Could not allocate bitmap!\n"); 623 } else { 624 dev_err(DEV, "BM resizing failed. " 625 "Leaving size unchanged at size = %lu KB\n", 626 (unsigned long)size); 627 } 628 rv = dev_size_error; 629 } 630 /* racy, see comments above. */ 631 drbd_set_my_capacity(mdev, size); 632 mdev->ldev->md.la_size_sect = size; 633 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1), 634 (unsigned long long)size>>1); 635 } 636 if (rv == dev_size_error) 637 goto out; 638 639 la_size_changed = (la_size != mdev->ldev->md.la_size_sect); 640 641 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev) 642 || prev_size != mdev->ldev->md.md_size_sect; 643 644 if (la_size_changed || md_moved) { 645 drbd_al_shrink(mdev); /* All extents inactive. */ 646 dev_info(DEV, "Writing the whole bitmap, %s\n", 647 la_size_changed && md_moved ? "size changed and md moved" : 648 la_size_changed ? "size changed" : "md moved"); 649 rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */ 650 drbd_md_mark_dirty(mdev); 651 } 652 653 if (size > la_size) 654 rv = grew; 655 if (size < la_size) 656 rv = shrunk; 657 out: 658 lc_unlock(mdev->act_log); 659 wake_up(&mdev->al_wait); 660 drbd_resume_io(mdev); 661 662 return rv; 663 } 664 665 sector_t 666 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space) 667 { 668 sector_t p_size = mdev->p_size; /* partner's disk size. */ 669 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */ 670 sector_t m_size; /* my size */ 671 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */ 672 sector_t size = 0; 673 674 m_size = drbd_get_max_capacity(bdev); 675 676 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) { 677 dev_warn(DEV, "Resize while not connected was forced by the user!\n"); 678 p_size = m_size; 679 } 680 681 if (p_size && m_size) { 682 size = min_t(sector_t, p_size, m_size); 683 } else { 684 if (la_size) { 685 size = la_size; 686 if (m_size && m_size < size) 687 size = m_size; 688 if (p_size && p_size < size) 689 size = p_size; 690 } else { 691 if (m_size) 692 size = m_size; 693 if (p_size) 694 size = p_size; 695 } 696 } 697 698 if (size == 0) 699 dev_err(DEV, "Both nodes diskless!\n"); 700 701 if (u_size) { 702 if (u_size > size) 703 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n", 704 (unsigned long)u_size>>1, (unsigned long)size>>1); 705 else 706 size = u_size; 707 } 708 709 return size; 710 } 711 712 /** 713 * drbd_check_al_size() - Ensures that the AL is of the right size 714 * @mdev: DRBD device. 715 * 716 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation 717 * failed, and 0 on success. You should call drbd_md_sync() after you called 718 * this function. 719 */ 720 static int drbd_check_al_size(struct drbd_conf *mdev) 721 { 722 struct lru_cache *n, *t; 723 struct lc_element *e; 724 unsigned int in_use; 725 int i; 726 727 ERR_IF(mdev->sync_conf.al_extents < 7) 728 mdev->sync_conf.al_extents = 127; 729 730 if (mdev->act_log && 731 mdev->act_log->nr_elements == mdev->sync_conf.al_extents) 732 return 0; 733 734 in_use = 0; 735 t = mdev->act_log; 736 n = lc_create("act_log", drbd_al_ext_cache, 737 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0); 738 739 if (n == NULL) { 740 dev_err(DEV, "Cannot allocate act_log lru!\n"); 741 return -ENOMEM; 742 } 743 spin_lock_irq(&mdev->al_lock); 744 if (t) { 745 for (i = 0; i < t->nr_elements; i++) { 746 e = lc_element_by_index(t, i); 747 if (e->refcnt) 748 dev_err(DEV, "refcnt(%d)==%d\n", 749 e->lc_number, e->refcnt); 750 in_use += e->refcnt; 751 } 752 } 753 if (!in_use) 754 mdev->act_log = n; 755 spin_unlock_irq(&mdev->al_lock); 756 if (in_use) { 757 dev_err(DEV, "Activity log still in use!\n"); 758 lc_destroy(n); 759 return -EBUSY; 760 } else { 761 if (t) 762 lc_destroy(t); 763 } 764 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */ 765 return 0; 766 } 767 768 void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local) 769 { 770 struct request_queue * const q = mdev->rq_queue; 771 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue; 772 int max_segments = mdev->ldev->dc.max_bio_bvecs; 773 774 max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s); 775 776 blk_queue_max_hw_sectors(q, max_seg_s >> 9); 777 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS); 778 blk_queue_max_segment_size(q, max_seg_s); 779 blk_queue_logical_block_size(q, 512); 780 blk_queue_segment_boundary(q, PAGE_SIZE-1); 781 blk_stack_limits(&q->limits, &b->limits, 0); 782 783 dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q)); 784 785 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) { 786 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n", 787 q->backing_dev_info.ra_pages, 788 b->backing_dev_info.ra_pages); 789 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages; 790 } 791 } 792 793 /* serialize deconfig (worker exiting, doing cleanup) 794 * and reconfig (drbdsetup disk, drbdsetup net) 795 * 796 * Wait for a potentially exiting worker, then restart it, 797 * or start a new one. Flush any pending work, there may still be an 798 * after_state_change queued. 799 */ 800 static void drbd_reconfig_start(struct drbd_conf *mdev) 801 { 802 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags)); 803 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags)); 804 drbd_thread_start(&mdev->worker); 805 drbd_flush_workqueue(mdev); 806 } 807 808 /* if still unconfigured, stops worker again. 809 * if configured now, clears CONFIG_PENDING. 810 * wakes potential waiters */ 811 static void drbd_reconfig_done(struct drbd_conf *mdev) 812 { 813 spin_lock_irq(&mdev->req_lock); 814 if (mdev->state.disk == D_DISKLESS && 815 mdev->state.conn == C_STANDALONE && 816 mdev->state.role == R_SECONDARY) { 817 set_bit(DEVICE_DYING, &mdev->flags); 818 drbd_thread_stop_nowait(&mdev->worker); 819 } else 820 clear_bit(CONFIG_PENDING, &mdev->flags); 821 spin_unlock_irq(&mdev->req_lock); 822 wake_up(&mdev->state_wait); 823 } 824 825 /* Make sure IO is suspended before calling this function(). */ 826 static void drbd_suspend_al(struct drbd_conf *mdev) 827 { 828 int s = 0; 829 830 if (lc_try_lock(mdev->act_log)) { 831 drbd_al_shrink(mdev); 832 lc_unlock(mdev->act_log); 833 } else { 834 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n"); 835 return; 836 } 837 838 spin_lock_irq(&mdev->req_lock); 839 if (mdev->state.conn < C_CONNECTED) 840 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags); 841 842 spin_unlock_irq(&mdev->req_lock); 843 844 if (s) 845 dev_info(DEV, "Suspended AL updates\n"); 846 } 847 848 /* does always return 0; 849 * interesting return code is in reply->ret_code */ 850 static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 851 struct drbd_nl_cfg_reply *reply) 852 { 853 enum drbd_ret_codes retcode; 854 enum determine_dev_size dd; 855 sector_t max_possible_sectors; 856 sector_t min_md_device_sectors; 857 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */ 858 struct inode *inode, *inode2; 859 struct lru_cache *resync_lru = NULL; 860 union drbd_state ns, os; 861 unsigned int max_seg_s; 862 int rv; 863 int cp_discovered = 0; 864 int logical_block_size; 865 866 drbd_reconfig_start(mdev); 867 868 /* if you want to reconfigure, please tear down first */ 869 if (mdev->state.disk > D_DISKLESS) { 870 retcode = ERR_DISK_CONFIGURED; 871 goto fail; 872 } 873 /* It may just now have detached because of IO error. Make sure 874 * drbd_ldev_destroy is done already, we may end up here very fast, 875 * e.g. if someone calls attach from the on-io-error handler, 876 * to realize a "hot spare" feature (not that I'd recommend that) */ 877 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt)); 878 879 /* allocation not in the IO path, cqueue thread context */ 880 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL); 881 if (!nbc) { 882 retcode = ERR_NOMEM; 883 goto fail; 884 } 885 886 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF; 887 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF; 888 nbc->dc.fencing = DRBD_FENCING_DEF; 889 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF; 890 891 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) { 892 retcode = ERR_MANDATORY_TAG; 893 goto fail; 894 } 895 896 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) { 897 retcode = ERR_MD_IDX_INVALID; 898 goto fail; 899 } 900 901 if (get_net_conf(mdev)) { 902 int prot = mdev->net_conf->wire_protocol; 903 put_net_conf(mdev); 904 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) { 905 retcode = ERR_STONITH_AND_PROT_A; 906 goto fail; 907 } 908 } 909 910 nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0); 911 if (IS_ERR(nbc->lo_file)) { 912 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev, 913 PTR_ERR(nbc->lo_file)); 914 nbc->lo_file = NULL; 915 retcode = ERR_OPEN_DISK; 916 goto fail; 917 } 918 919 inode = nbc->lo_file->f_dentry->d_inode; 920 921 if (!S_ISBLK(inode->i_mode)) { 922 retcode = ERR_DISK_NOT_BDEV; 923 goto fail; 924 } 925 926 nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0); 927 if (IS_ERR(nbc->md_file)) { 928 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev, 929 PTR_ERR(nbc->md_file)); 930 nbc->md_file = NULL; 931 retcode = ERR_OPEN_MD_DISK; 932 goto fail; 933 } 934 935 inode2 = nbc->md_file->f_dentry->d_inode; 936 937 if (!S_ISBLK(inode2->i_mode)) { 938 retcode = ERR_MD_NOT_BDEV; 939 goto fail; 940 } 941 942 nbc->backing_bdev = inode->i_bdev; 943 if (bd_claim(nbc->backing_bdev, mdev)) { 944 printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n", 945 nbc->backing_bdev, mdev, 946 nbc->backing_bdev->bd_holder, 947 nbc->backing_bdev->bd_contains->bd_holder, 948 nbc->backing_bdev->bd_holders); 949 retcode = ERR_BDCLAIM_DISK; 950 goto fail; 951 } 952 953 resync_lru = lc_create("resync", drbd_bm_ext_cache, 954 61, sizeof(struct bm_extent), 955 offsetof(struct bm_extent, lce)); 956 if (!resync_lru) { 957 retcode = ERR_NOMEM; 958 goto release_bdev_fail; 959 } 960 961 /* meta_dev_idx >= 0: external fixed size, 962 * possibly multiple drbd sharing one meta device. 963 * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is 964 * not yet used by some other drbd minor! 965 * (if you use drbd.conf + drbdadm, 966 * that should check it for you already; but if you don't, or someone 967 * fooled it, we need to double check here) */ 968 nbc->md_bdev = inode2->i_bdev; 969 if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev 970 : (void *) drbd_m_holder)) { 971 retcode = ERR_BDCLAIM_MD_DISK; 972 goto release_bdev_fail; 973 } 974 975 if ((nbc->backing_bdev == nbc->md_bdev) != 976 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL || 977 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) { 978 retcode = ERR_MD_IDX_INVALID; 979 goto release_bdev2_fail; 980 } 981 982 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */ 983 drbd_md_set_sector_offsets(mdev, nbc); 984 985 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) { 986 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n", 987 (unsigned long long) drbd_get_max_capacity(nbc), 988 (unsigned long long) nbc->dc.disk_size); 989 retcode = ERR_DISK_TO_SMALL; 990 goto release_bdev2_fail; 991 } 992 993 if (nbc->dc.meta_dev_idx < 0) { 994 max_possible_sectors = DRBD_MAX_SECTORS_FLEX; 995 /* at least one MB, otherwise it does not make sense */ 996 min_md_device_sectors = (2<<10); 997 } else { 998 max_possible_sectors = DRBD_MAX_SECTORS; 999 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1); 1000 } 1001 1002 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) { 1003 retcode = ERR_MD_DISK_TO_SMALL; 1004 dev_warn(DEV, "refusing attach: md-device too small, " 1005 "at least %llu sectors needed for this meta-disk type\n", 1006 (unsigned long long) min_md_device_sectors); 1007 goto release_bdev2_fail; 1008 } 1009 1010 /* Make sure the new disk is big enough 1011 * (we may currently be R_PRIMARY with no local disk...) */ 1012 if (drbd_get_max_capacity(nbc) < 1013 drbd_get_capacity(mdev->this_bdev)) { 1014 retcode = ERR_DISK_TO_SMALL; 1015 goto release_bdev2_fail; 1016 } 1017 1018 nbc->known_size = drbd_get_capacity(nbc->backing_bdev); 1019 1020 if (nbc->known_size > max_possible_sectors) { 1021 dev_warn(DEV, "==> truncating very big lower level device " 1022 "to currently maximum possible %llu sectors <==\n", 1023 (unsigned long long) max_possible_sectors); 1024 if (nbc->dc.meta_dev_idx >= 0) 1025 dev_warn(DEV, "==>> using internal or flexible " 1026 "meta data may help <<==\n"); 1027 } 1028 1029 drbd_suspend_io(mdev); 1030 /* also wait for the last barrier ack. */ 1031 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state)); 1032 /* and for any other previously queued work */ 1033 drbd_flush_workqueue(mdev); 1034 1035 retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE); 1036 drbd_resume_io(mdev); 1037 if (retcode < SS_SUCCESS) 1038 goto release_bdev2_fail; 1039 1040 if (!get_ldev_if_state(mdev, D_ATTACHING)) 1041 goto force_diskless; 1042 1043 drbd_md_set_sector_offsets(mdev, nbc); 1044 1045 /* allocate a second IO page if logical_block_size != 512 */ 1046 logical_block_size = bdev_logical_block_size(nbc->md_bdev); 1047 if (logical_block_size == 0) 1048 logical_block_size = MD_SECTOR_SIZE; 1049 1050 if (logical_block_size != MD_SECTOR_SIZE) { 1051 if (!mdev->md_io_tmpp) { 1052 struct page *page = alloc_page(GFP_NOIO); 1053 if (!page) 1054 goto force_diskless_dec; 1055 1056 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n", 1057 logical_block_size, MD_SECTOR_SIZE); 1058 dev_warn(DEV, "Workaround engaged (has performance impact).\n"); 1059 1060 mdev->md_io_tmpp = page; 1061 } 1062 } 1063 1064 if (!mdev->bitmap) { 1065 if (drbd_bm_init(mdev)) { 1066 retcode = ERR_NOMEM; 1067 goto force_diskless_dec; 1068 } 1069 } 1070 1071 retcode = drbd_md_read(mdev, nbc); 1072 if (retcode != NO_ERROR) 1073 goto force_diskless_dec; 1074 1075 if (mdev->state.conn < C_CONNECTED && 1076 mdev->state.role == R_PRIMARY && 1077 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) { 1078 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n", 1079 (unsigned long long)mdev->ed_uuid); 1080 retcode = ERR_DATA_NOT_CURRENT; 1081 goto force_diskless_dec; 1082 } 1083 1084 /* Since we are diskless, fix the activity log first... */ 1085 if (drbd_check_al_size(mdev)) { 1086 retcode = ERR_NOMEM; 1087 goto force_diskless_dec; 1088 } 1089 1090 /* Prevent shrinking of consistent devices ! */ 1091 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) && 1092 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) { 1093 dev_warn(DEV, "refusing to truncate a consistent device\n"); 1094 retcode = ERR_DISK_TO_SMALL; 1095 goto force_diskless_dec; 1096 } 1097 1098 if (!drbd_al_read_log(mdev, nbc)) { 1099 retcode = ERR_IO_MD_DISK; 1100 goto force_diskless_dec; 1101 } 1102 1103 /* Reset the "barriers don't work" bits here, then force meta data to 1104 * be written, to ensure we determine if barriers are supported. */ 1105 if (nbc->dc.no_md_flush) 1106 set_bit(MD_NO_FUA, &mdev->flags); 1107 else 1108 clear_bit(MD_NO_FUA, &mdev->flags); 1109 1110 /* Point of no return reached. 1111 * Devices and memory are no longer released by error cleanup below. 1112 * now mdev takes over responsibility, and the state engine should 1113 * clean it up somewhere. */ 1114 D_ASSERT(mdev->ldev == NULL); 1115 mdev->ldev = nbc; 1116 mdev->resync = resync_lru; 1117 nbc = NULL; 1118 resync_lru = NULL; 1119 1120 mdev->write_ordering = WO_bdev_flush; 1121 drbd_bump_write_ordering(mdev, WO_bdev_flush); 1122 1123 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY)) 1124 set_bit(CRASHED_PRIMARY, &mdev->flags); 1125 else 1126 clear_bit(CRASHED_PRIMARY, &mdev->flags); 1127 1128 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && 1129 !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) { 1130 set_bit(CRASHED_PRIMARY, &mdev->flags); 1131 cp_discovered = 1; 1132 } 1133 1134 mdev->send_cnt = 0; 1135 mdev->recv_cnt = 0; 1136 mdev->read_cnt = 0; 1137 mdev->writ_cnt = 0; 1138 1139 max_seg_s = DRBD_MAX_SEGMENT_SIZE; 1140 if (mdev->state.conn == C_CONNECTED) { 1141 /* We are Primary, Connected, and now attach a new local 1142 * backing store. We must not increase the user visible maximum 1143 * bio size on this device to something the peer may not be 1144 * able to handle. */ 1145 if (mdev->agreed_pro_version < 94) 1146 max_seg_s = queue_max_segment_size(mdev->rq_queue); 1147 else if (mdev->agreed_pro_version == 94) 1148 max_seg_s = DRBD_MAX_SIZE_H80_PACKET; 1149 /* else: drbd 8.3.9 and later, stay with default */ 1150 } 1151 1152 drbd_setup_queue_param(mdev, max_seg_s); 1153 1154 /* If I am currently not R_PRIMARY, 1155 * but meta data primary indicator is set, 1156 * I just now recover from a hard crash, 1157 * and have been R_PRIMARY before that crash. 1158 * 1159 * Now, if I had no connection before that crash 1160 * (have been degraded R_PRIMARY), chances are that 1161 * I won't find my peer now either. 1162 * 1163 * In that case, and _only_ in that case, 1164 * we use the degr-wfc-timeout instead of the default, 1165 * so we can automatically recover from a crash of a 1166 * degraded but active "cluster" after a certain timeout. 1167 */ 1168 clear_bit(USE_DEGR_WFC_T, &mdev->flags); 1169 if (mdev->state.role != R_PRIMARY && 1170 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && 1171 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND)) 1172 set_bit(USE_DEGR_WFC_T, &mdev->flags); 1173 1174 dd = drbd_determin_dev_size(mdev, 0); 1175 if (dd == dev_size_error) { 1176 retcode = ERR_NOMEM_BITMAP; 1177 goto force_diskless_dec; 1178 } else if (dd == grew) 1179 set_bit(RESYNC_AFTER_NEG, &mdev->flags); 1180 1181 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { 1182 dev_info(DEV, "Assuming that all blocks are out of sync " 1183 "(aka FullSync)\n"); 1184 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) { 1185 retcode = ERR_IO_MD_DISK; 1186 goto force_diskless_dec; 1187 } 1188 } else { 1189 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) { 1190 retcode = ERR_IO_MD_DISK; 1191 goto force_diskless_dec; 1192 } 1193 } 1194 1195 if (cp_discovered) { 1196 drbd_al_apply_to_bm(mdev); 1197 drbd_al_to_on_disk_bm(mdev); 1198 } 1199 1200 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev)) 1201 drbd_suspend_al(mdev); /* IO is still suspended here... */ 1202 1203 spin_lock_irq(&mdev->req_lock); 1204 os = mdev->state; 1205 ns.i = os.i; 1206 /* If MDF_CONSISTENT is not set go into inconsistent state, 1207 otherwise investigate MDF_WasUpToDate... 1208 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state, 1209 otherwise into D_CONSISTENT state. 1210 */ 1211 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) { 1212 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE)) 1213 ns.disk = D_CONSISTENT; 1214 else 1215 ns.disk = D_OUTDATED; 1216 } else { 1217 ns.disk = D_INCONSISTENT; 1218 } 1219 1220 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED)) 1221 ns.pdsk = D_OUTDATED; 1222 1223 if ( ns.disk == D_CONSISTENT && 1224 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE)) 1225 ns.disk = D_UP_TO_DATE; 1226 1227 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND, 1228 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before 1229 this point, because drbd_request_state() modifies these 1230 flags. */ 1231 1232 /* In case we are C_CONNECTED postpone any decision on the new disk 1233 state after the negotiation phase. */ 1234 if (mdev->state.conn == C_CONNECTED) { 1235 mdev->new_state_tmp.i = ns.i; 1236 ns.i = os.i; 1237 ns.disk = D_NEGOTIATING; 1238 1239 /* We expect to receive up-to-date UUIDs soon. 1240 To avoid a race in receive_state, free p_uuid while 1241 holding req_lock. I.e. atomic with the state change */ 1242 kfree(mdev->p_uuid); 1243 mdev->p_uuid = NULL; 1244 } 1245 1246 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 1247 ns = mdev->state; 1248 spin_unlock_irq(&mdev->req_lock); 1249 1250 if (rv < SS_SUCCESS) 1251 goto force_diskless_dec; 1252 1253 if (mdev->state.role == R_PRIMARY) 1254 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1; 1255 else 1256 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; 1257 1258 drbd_md_mark_dirty(mdev); 1259 drbd_md_sync(mdev); 1260 1261 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1262 put_ldev(mdev); 1263 reply->ret_code = retcode; 1264 drbd_reconfig_done(mdev); 1265 return 0; 1266 1267 force_diskless_dec: 1268 put_ldev(mdev); 1269 force_diskless: 1270 drbd_force_state(mdev, NS(disk, D_FAILED)); 1271 drbd_md_sync(mdev); 1272 release_bdev2_fail: 1273 if (nbc) 1274 bd_release(nbc->md_bdev); 1275 release_bdev_fail: 1276 if (nbc) 1277 bd_release(nbc->backing_bdev); 1278 fail: 1279 if (nbc) { 1280 if (nbc->lo_file) 1281 fput(nbc->lo_file); 1282 if (nbc->md_file) 1283 fput(nbc->md_file); 1284 kfree(nbc); 1285 } 1286 lc_destroy(resync_lru); 1287 1288 reply->ret_code = retcode; 1289 drbd_reconfig_done(mdev); 1290 return 0; 1291 } 1292 1293 /* Detaching the disk is a process in multiple stages. First we need to lock 1294 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io. 1295 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all 1296 * internal references as well. 1297 * Only then we have finally detached. */ 1298 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1299 struct drbd_nl_cfg_reply *reply) 1300 { 1301 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */ 1302 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS)); 1303 if (mdev->state.disk == D_DISKLESS) 1304 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt)); 1305 drbd_resume_io(mdev); 1306 return 0; 1307 } 1308 1309 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1310 struct drbd_nl_cfg_reply *reply) 1311 { 1312 int i, ns; 1313 enum drbd_ret_codes retcode; 1314 struct net_conf *new_conf = NULL; 1315 struct crypto_hash *tfm = NULL; 1316 struct crypto_hash *integrity_w_tfm = NULL; 1317 struct crypto_hash *integrity_r_tfm = NULL; 1318 struct hlist_head *new_tl_hash = NULL; 1319 struct hlist_head *new_ee_hash = NULL; 1320 struct drbd_conf *odev; 1321 char hmac_name[CRYPTO_MAX_ALG_NAME]; 1322 void *int_dig_out = NULL; 1323 void *int_dig_in = NULL; 1324 void *int_dig_vv = NULL; 1325 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr; 1326 1327 drbd_reconfig_start(mdev); 1328 1329 if (mdev->state.conn > C_STANDALONE) { 1330 retcode = ERR_NET_CONFIGURED; 1331 goto fail; 1332 } 1333 1334 /* allocation not in the IO path, cqueue thread context */ 1335 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 1336 if (!new_conf) { 1337 retcode = ERR_NOMEM; 1338 goto fail; 1339 } 1340 1341 new_conf->timeout = DRBD_TIMEOUT_DEF; 1342 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF; 1343 new_conf->ping_int = DRBD_PING_INT_DEF; 1344 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF; 1345 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF; 1346 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF; 1347 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF; 1348 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF; 1349 new_conf->ko_count = DRBD_KO_COUNT_DEF; 1350 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF; 1351 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF; 1352 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF; 1353 new_conf->want_lose = 0; 1354 new_conf->two_primaries = 0; 1355 new_conf->wire_protocol = DRBD_PROT_C; 1356 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF; 1357 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF; 1358 1359 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) { 1360 retcode = ERR_MANDATORY_TAG; 1361 goto fail; 1362 } 1363 1364 if (new_conf->two_primaries 1365 && (new_conf->wire_protocol != DRBD_PROT_C)) { 1366 retcode = ERR_NOT_PROTO_C; 1367 goto fail; 1368 } 1369 1370 if (get_ldev(mdev)) { 1371 enum drbd_fencing_p fp = mdev->ldev->dc.fencing; 1372 put_ldev(mdev); 1373 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) { 1374 retcode = ERR_STONITH_AND_PROT_A; 1375 goto fail; 1376 } 1377 } 1378 1379 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) { 1380 retcode = ERR_DISCARD; 1381 goto fail; 1382 } 1383 1384 retcode = NO_ERROR; 1385 1386 new_my_addr = (struct sockaddr *)&new_conf->my_addr; 1387 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr; 1388 for (i = 0; i < minor_count; i++) { 1389 odev = minor_to_mdev(i); 1390 if (!odev || odev == mdev) 1391 continue; 1392 if (get_net_conf(odev)) { 1393 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr; 1394 if (new_conf->my_addr_len == odev->net_conf->my_addr_len && 1395 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len)) 1396 retcode = ERR_LOCAL_ADDR; 1397 1398 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr; 1399 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len && 1400 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len)) 1401 retcode = ERR_PEER_ADDR; 1402 1403 put_net_conf(odev); 1404 if (retcode != NO_ERROR) 1405 goto fail; 1406 } 1407 } 1408 1409 if (new_conf->cram_hmac_alg[0] != 0) { 1410 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", 1411 new_conf->cram_hmac_alg); 1412 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC); 1413 if (IS_ERR(tfm)) { 1414 tfm = NULL; 1415 retcode = ERR_AUTH_ALG; 1416 goto fail; 1417 } 1418 1419 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 1420 retcode = ERR_AUTH_ALG_ND; 1421 goto fail; 1422 } 1423 } 1424 1425 if (new_conf->integrity_alg[0]) { 1426 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1427 if (IS_ERR(integrity_w_tfm)) { 1428 integrity_w_tfm = NULL; 1429 retcode=ERR_INTEGRITY_ALG; 1430 goto fail; 1431 } 1432 1433 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) { 1434 retcode=ERR_INTEGRITY_ALG_ND; 1435 goto fail; 1436 } 1437 1438 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1439 if (IS_ERR(integrity_r_tfm)) { 1440 integrity_r_tfm = NULL; 1441 retcode=ERR_INTEGRITY_ALG; 1442 goto fail; 1443 } 1444 } 1445 1446 ns = new_conf->max_epoch_size/8; 1447 if (mdev->tl_hash_s != ns) { 1448 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1449 if (!new_tl_hash) { 1450 retcode = ERR_NOMEM; 1451 goto fail; 1452 } 1453 } 1454 1455 ns = new_conf->max_buffers/8; 1456 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) { 1457 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1458 if (!new_ee_hash) { 1459 retcode = ERR_NOMEM; 1460 goto fail; 1461 } 1462 } 1463 1464 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0; 1465 1466 if (integrity_w_tfm) { 1467 i = crypto_hash_digestsize(integrity_w_tfm); 1468 int_dig_out = kmalloc(i, GFP_KERNEL); 1469 if (!int_dig_out) { 1470 retcode = ERR_NOMEM; 1471 goto fail; 1472 } 1473 int_dig_in = kmalloc(i, GFP_KERNEL); 1474 if (!int_dig_in) { 1475 retcode = ERR_NOMEM; 1476 goto fail; 1477 } 1478 int_dig_vv = kmalloc(i, GFP_KERNEL); 1479 if (!int_dig_vv) { 1480 retcode = ERR_NOMEM; 1481 goto fail; 1482 } 1483 } 1484 1485 if (!mdev->bitmap) { 1486 if(drbd_bm_init(mdev)) { 1487 retcode = ERR_NOMEM; 1488 goto fail; 1489 } 1490 } 1491 1492 drbd_flush_workqueue(mdev); 1493 spin_lock_irq(&mdev->req_lock); 1494 if (mdev->net_conf != NULL) { 1495 retcode = ERR_NET_CONFIGURED; 1496 spin_unlock_irq(&mdev->req_lock); 1497 goto fail; 1498 } 1499 mdev->net_conf = new_conf; 1500 1501 mdev->send_cnt = 0; 1502 mdev->recv_cnt = 0; 1503 1504 if (new_tl_hash) { 1505 kfree(mdev->tl_hash); 1506 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8; 1507 mdev->tl_hash = new_tl_hash; 1508 } 1509 1510 if (new_ee_hash) { 1511 kfree(mdev->ee_hash); 1512 mdev->ee_hash_s = mdev->net_conf->max_buffers/8; 1513 mdev->ee_hash = new_ee_hash; 1514 } 1515 1516 crypto_free_hash(mdev->cram_hmac_tfm); 1517 mdev->cram_hmac_tfm = tfm; 1518 1519 crypto_free_hash(mdev->integrity_w_tfm); 1520 mdev->integrity_w_tfm = integrity_w_tfm; 1521 1522 crypto_free_hash(mdev->integrity_r_tfm); 1523 mdev->integrity_r_tfm = integrity_r_tfm; 1524 1525 kfree(mdev->int_dig_out); 1526 kfree(mdev->int_dig_in); 1527 kfree(mdev->int_dig_vv); 1528 mdev->int_dig_out=int_dig_out; 1529 mdev->int_dig_in=int_dig_in; 1530 mdev->int_dig_vv=int_dig_vv; 1531 retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL); 1532 spin_unlock_irq(&mdev->req_lock); 1533 1534 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1535 reply->ret_code = retcode; 1536 drbd_reconfig_done(mdev); 1537 return 0; 1538 1539 fail: 1540 kfree(int_dig_out); 1541 kfree(int_dig_in); 1542 kfree(int_dig_vv); 1543 crypto_free_hash(tfm); 1544 crypto_free_hash(integrity_w_tfm); 1545 crypto_free_hash(integrity_r_tfm); 1546 kfree(new_tl_hash); 1547 kfree(new_ee_hash); 1548 kfree(new_conf); 1549 1550 reply->ret_code = retcode; 1551 drbd_reconfig_done(mdev); 1552 return 0; 1553 } 1554 1555 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1556 struct drbd_nl_cfg_reply *reply) 1557 { 1558 int retcode; 1559 1560 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED); 1561 1562 if (retcode == SS_NOTHING_TO_DO) 1563 goto done; 1564 else if (retcode == SS_ALREADY_STANDALONE) 1565 goto done; 1566 else if (retcode == SS_PRIMARY_NOP) { 1567 /* Our statche checking code wants to see the peer outdated. */ 1568 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1569 pdsk, D_OUTDATED)); 1570 } else if (retcode == SS_CW_FAILED_BY_PEER) { 1571 /* The peer probably wants to see us outdated. */ 1572 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1573 disk, D_OUTDATED), 1574 CS_ORDERED); 1575 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) { 1576 drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 1577 retcode = SS_SUCCESS; 1578 } 1579 } 1580 1581 if (retcode < SS_SUCCESS) 1582 goto fail; 1583 1584 if (wait_event_interruptible(mdev->state_wait, 1585 mdev->state.conn != C_DISCONNECTING)) { 1586 /* Do not test for mdev->state.conn == C_STANDALONE, since 1587 someone else might connect us in the mean time! */ 1588 retcode = ERR_INTR; 1589 goto fail; 1590 } 1591 1592 done: 1593 retcode = NO_ERROR; 1594 fail: 1595 drbd_md_sync(mdev); 1596 reply->ret_code = retcode; 1597 return 0; 1598 } 1599 1600 void resync_after_online_grow(struct drbd_conf *mdev) 1601 { 1602 int iass; /* I am sync source */ 1603 1604 dev_info(DEV, "Resync of new storage after online grow\n"); 1605 if (mdev->state.role != mdev->state.peer) 1606 iass = (mdev->state.role == R_PRIMARY); 1607 else 1608 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1609 1610 if (iass) 1611 drbd_start_resync(mdev, C_SYNC_SOURCE); 1612 else 1613 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE); 1614 } 1615 1616 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1617 struct drbd_nl_cfg_reply *reply) 1618 { 1619 struct resize rs; 1620 int retcode = NO_ERROR; 1621 enum determine_dev_size dd; 1622 enum dds_flags ddsf; 1623 1624 memset(&rs, 0, sizeof(struct resize)); 1625 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) { 1626 retcode = ERR_MANDATORY_TAG; 1627 goto fail; 1628 } 1629 1630 if (mdev->state.conn > C_CONNECTED) { 1631 retcode = ERR_RESIZE_RESYNC; 1632 goto fail; 1633 } 1634 1635 if (mdev->state.role == R_SECONDARY && 1636 mdev->state.peer == R_SECONDARY) { 1637 retcode = ERR_NO_PRIMARY; 1638 goto fail; 1639 } 1640 1641 if (!get_ldev(mdev)) { 1642 retcode = ERR_NO_DISK; 1643 goto fail; 1644 } 1645 1646 if (rs.no_resync && mdev->agreed_pro_version < 93) { 1647 retcode = ERR_NEED_APV_93; 1648 goto fail; 1649 } 1650 1651 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) 1652 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 1653 1654 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size; 1655 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0); 1656 dd = drbd_determin_dev_size(mdev, ddsf); 1657 drbd_md_sync(mdev); 1658 put_ldev(mdev); 1659 if (dd == dev_size_error) { 1660 retcode = ERR_NOMEM_BITMAP; 1661 goto fail; 1662 } 1663 1664 if (mdev->state.conn == C_CONNECTED) { 1665 if (dd == grew) 1666 set_bit(RESIZE_PENDING, &mdev->flags); 1667 1668 drbd_send_uuids(mdev); 1669 drbd_send_sizes(mdev, 1, ddsf); 1670 } 1671 1672 fail: 1673 reply->ret_code = retcode; 1674 return 0; 1675 } 1676 1677 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1678 struct drbd_nl_cfg_reply *reply) 1679 { 1680 int retcode = NO_ERROR; 1681 int err; 1682 int ovr; /* online verify running */ 1683 int rsr; /* re-sync running */ 1684 struct crypto_hash *verify_tfm = NULL; 1685 struct crypto_hash *csums_tfm = NULL; 1686 struct syncer_conf sc; 1687 cpumask_var_t new_cpu_mask; 1688 int *rs_plan_s = NULL; 1689 int fifo_size; 1690 1691 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) { 1692 retcode = ERR_NOMEM; 1693 goto fail; 1694 } 1695 1696 if (nlp->flags & DRBD_NL_SET_DEFAULTS) { 1697 memset(&sc, 0, sizeof(struct syncer_conf)); 1698 sc.rate = DRBD_RATE_DEF; 1699 sc.after = DRBD_AFTER_DEF; 1700 sc.al_extents = DRBD_AL_EXTENTS_DEF; 1701 sc.on_no_data = DRBD_ON_NO_DATA_DEF; 1702 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF; 1703 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF; 1704 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF; 1705 sc.c_max_rate = DRBD_C_MAX_RATE_DEF; 1706 sc.c_min_rate = DRBD_C_MIN_RATE_DEF; 1707 } else 1708 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf)); 1709 1710 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) { 1711 retcode = ERR_MANDATORY_TAG; 1712 goto fail; 1713 } 1714 1715 /* re-sync running */ 1716 rsr = ( mdev->state.conn == C_SYNC_SOURCE || 1717 mdev->state.conn == C_SYNC_TARGET || 1718 mdev->state.conn == C_PAUSED_SYNC_S || 1719 mdev->state.conn == C_PAUSED_SYNC_T ); 1720 1721 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) { 1722 retcode = ERR_CSUMS_RESYNC_RUNNING; 1723 goto fail; 1724 } 1725 1726 if (!rsr && sc.csums_alg[0]) { 1727 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC); 1728 if (IS_ERR(csums_tfm)) { 1729 csums_tfm = NULL; 1730 retcode = ERR_CSUMS_ALG; 1731 goto fail; 1732 } 1733 1734 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) { 1735 retcode = ERR_CSUMS_ALG_ND; 1736 goto fail; 1737 } 1738 } 1739 1740 /* online verify running */ 1741 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T); 1742 1743 if (ovr) { 1744 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) { 1745 retcode = ERR_VERIFY_RUNNING; 1746 goto fail; 1747 } 1748 } 1749 1750 if (!ovr && sc.verify_alg[0]) { 1751 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC); 1752 if (IS_ERR(verify_tfm)) { 1753 verify_tfm = NULL; 1754 retcode = ERR_VERIFY_ALG; 1755 goto fail; 1756 } 1757 1758 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) { 1759 retcode = ERR_VERIFY_ALG_ND; 1760 goto fail; 1761 } 1762 } 1763 1764 /* silently ignore cpu mask on UP kernel */ 1765 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) { 1766 err = __bitmap_parse(sc.cpu_mask, 32, 0, 1767 cpumask_bits(new_cpu_mask), nr_cpu_ids); 1768 if (err) { 1769 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err); 1770 retcode = ERR_CPU_MASK_PARSE; 1771 goto fail; 1772 } 1773 } 1774 1775 ERR_IF (sc.rate < 1) sc.rate = 1; 1776 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */ 1777 #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT) 1778 if (sc.al_extents > AL_MAX) { 1779 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX); 1780 sc.al_extents = AL_MAX; 1781 } 1782 #undef AL_MAX 1783 1784 /* to avoid spurious errors when configuring minors before configuring 1785 * the minors they depend on: if necessary, first create the minor we 1786 * depend on */ 1787 if (sc.after >= 0) 1788 ensure_mdev(sc.after, 1); 1789 1790 /* most sanity checks done, try to assign the new sync-after 1791 * dependency. need to hold the global lock in there, 1792 * to avoid a race in the dependency loop check. */ 1793 retcode = drbd_alter_sa(mdev, sc.after); 1794 if (retcode != NO_ERROR) 1795 goto fail; 1796 1797 fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 1798 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 1799 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 1800 if (!rs_plan_s) { 1801 dev_err(DEV, "kmalloc of fifo_buffer failed"); 1802 retcode = ERR_NOMEM; 1803 goto fail; 1804 } 1805 } 1806 1807 /* ok, assign the rest of it as well. 1808 * lock against receive_SyncParam() */ 1809 spin_lock(&mdev->peer_seq_lock); 1810 mdev->sync_conf = sc; 1811 1812 if (!rsr) { 1813 crypto_free_hash(mdev->csums_tfm); 1814 mdev->csums_tfm = csums_tfm; 1815 csums_tfm = NULL; 1816 } 1817 1818 if (!ovr) { 1819 crypto_free_hash(mdev->verify_tfm); 1820 mdev->verify_tfm = verify_tfm; 1821 verify_tfm = NULL; 1822 } 1823 1824 if (fifo_size != mdev->rs_plan_s.size) { 1825 kfree(mdev->rs_plan_s.values); 1826 mdev->rs_plan_s.values = rs_plan_s; 1827 mdev->rs_plan_s.size = fifo_size; 1828 mdev->rs_planed = 0; 1829 rs_plan_s = NULL; 1830 } 1831 1832 spin_unlock(&mdev->peer_seq_lock); 1833 1834 if (get_ldev(mdev)) { 1835 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); 1836 drbd_al_shrink(mdev); 1837 err = drbd_check_al_size(mdev); 1838 lc_unlock(mdev->act_log); 1839 wake_up(&mdev->al_wait); 1840 1841 put_ldev(mdev); 1842 drbd_md_sync(mdev); 1843 1844 if (err) { 1845 retcode = ERR_NOMEM; 1846 goto fail; 1847 } 1848 } 1849 1850 if (mdev->state.conn >= C_CONNECTED) 1851 drbd_send_sync_param(mdev, &sc); 1852 1853 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) { 1854 cpumask_copy(mdev->cpu_mask, new_cpu_mask); 1855 drbd_calc_cpu_mask(mdev); 1856 mdev->receiver.reset_cpu_mask = 1; 1857 mdev->asender.reset_cpu_mask = 1; 1858 mdev->worker.reset_cpu_mask = 1; 1859 } 1860 1861 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1862 fail: 1863 kfree(rs_plan_s); 1864 free_cpumask_var(new_cpu_mask); 1865 crypto_free_hash(csums_tfm); 1866 crypto_free_hash(verify_tfm); 1867 reply->ret_code = retcode; 1868 return 0; 1869 } 1870 1871 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1872 struct drbd_nl_cfg_reply *reply) 1873 { 1874 int retcode; 1875 1876 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED); 1877 1878 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION) 1879 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1880 1881 while (retcode == SS_NEED_CONNECTION) { 1882 spin_lock_irq(&mdev->req_lock); 1883 if (mdev->state.conn < C_CONNECTED) 1884 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL); 1885 spin_unlock_irq(&mdev->req_lock); 1886 1887 if (retcode != SS_NEED_CONNECTION) 1888 break; 1889 1890 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1891 } 1892 1893 reply->ret_code = retcode; 1894 return 0; 1895 } 1896 1897 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev) 1898 { 1899 int rv; 1900 1901 rv = drbd_bmio_set_n_write(mdev); 1902 drbd_suspend_al(mdev); 1903 return rv; 1904 } 1905 1906 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1907 struct drbd_nl_cfg_reply *reply) 1908 { 1909 int retcode; 1910 1911 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED); 1912 1913 if (retcode < SS_SUCCESS) { 1914 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) { 1915 /* The peer will get a resync upon connect anyways. Just make that 1916 into a full resync. */ 1917 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT)); 1918 if (retcode >= SS_SUCCESS) { 1919 /* open coded drbd_bitmap_io() */ 1920 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al, 1921 "set_n_write from invalidate_peer")) 1922 retcode = ERR_IO_MD_DISK; 1923 } 1924 } else 1925 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S)); 1926 } 1927 1928 reply->ret_code = retcode; 1929 return 0; 1930 } 1931 1932 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1933 struct drbd_nl_cfg_reply *reply) 1934 { 1935 int retcode = NO_ERROR; 1936 1937 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO) 1938 retcode = ERR_PAUSE_IS_SET; 1939 1940 reply->ret_code = retcode; 1941 return 0; 1942 } 1943 1944 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1945 struct drbd_nl_cfg_reply *reply) 1946 { 1947 int retcode = NO_ERROR; 1948 1949 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) 1950 retcode = ERR_PAUSE_IS_CLEAR; 1951 1952 reply->ret_code = retcode; 1953 return 0; 1954 } 1955 1956 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1957 struct drbd_nl_cfg_reply *reply) 1958 { 1959 reply->ret_code = drbd_request_state(mdev, NS(susp, 1)); 1960 1961 return 0; 1962 } 1963 1964 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1965 struct drbd_nl_cfg_reply *reply) 1966 { 1967 if (test_bit(NEW_CUR_UUID, &mdev->flags)) { 1968 drbd_uuid_new_current(mdev); 1969 clear_bit(NEW_CUR_UUID, &mdev->flags); 1970 } 1971 drbd_suspend_io(mdev); 1972 reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0)); 1973 if (reply->ret_code == SS_SUCCESS) { 1974 if (mdev->state.conn < C_CONNECTED) 1975 tl_clear(mdev); 1976 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED) 1977 tl_restart(mdev, fail_frozen_disk_io); 1978 } 1979 drbd_resume_io(mdev); 1980 1981 return 0; 1982 } 1983 1984 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1985 struct drbd_nl_cfg_reply *reply) 1986 { 1987 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED)); 1988 return 0; 1989 } 1990 1991 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1992 struct drbd_nl_cfg_reply *reply) 1993 { 1994 unsigned short *tl; 1995 1996 tl = reply->tag_list; 1997 1998 if (get_ldev(mdev)) { 1999 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl); 2000 put_ldev(mdev); 2001 } 2002 2003 if (get_net_conf(mdev)) { 2004 tl = net_conf_to_tags(mdev, mdev->net_conf, tl); 2005 put_net_conf(mdev); 2006 } 2007 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl); 2008 2009 put_unaligned(TT_END, tl++); /* Close the tag list */ 2010 2011 return (int)((char *)tl - (char *)reply->tag_list); 2012 } 2013 2014 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2015 struct drbd_nl_cfg_reply *reply) 2016 { 2017 unsigned short *tl = reply->tag_list; 2018 union drbd_state s = mdev->state; 2019 unsigned long rs_left; 2020 unsigned int res; 2021 2022 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl); 2023 2024 /* no local ref, no bitmap, no syncer progress. */ 2025 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) { 2026 if (get_ldev(mdev)) { 2027 drbd_get_syncer_progress(mdev, &rs_left, &res); 2028 tl = tl_add_int(tl, T_sync_progress, &res); 2029 put_ldev(mdev); 2030 } 2031 } 2032 put_unaligned(TT_END, tl++); /* Close the tag list */ 2033 2034 return (int)((char *)tl - (char *)reply->tag_list); 2035 } 2036 2037 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2038 struct drbd_nl_cfg_reply *reply) 2039 { 2040 unsigned short *tl; 2041 2042 tl = reply->tag_list; 2043 2044 if (get_ldev(mdev)) { 2045 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64)); 2046 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags); 2047 put_ldev(mdev); 2048 } 2049 put_unaligned(TT_END, tl++); /* Close the tag list */ 2050 2051 return (int)((char *)tl - (char *)reply->tag_list); 2052 } 2053 2054 /** 2055 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use 2056 * @mdev: DRBD device. 2057 * @nlp: Netlink/connector packet from drbdsetup 2058 * @reply: Reply packet for drbdsetup 2059 */ 2060 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2061 struct drbd_nl_cfg_reply *reply) 2062 { 2063 unsigned short *tl; 2064 char rv; 2065 2066 tl = reply->tag_list; 2067 2068 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED : 2069 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT; 2070 2071 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv)); 2072 put_unaligned(TT_END, tl++); /* Close the tag list */ 2073 2074 return (int)((char *)tl - (char *)reply->tag_list); 2075 } 2076 2077 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2078 struct drbd_nl_cfg_reply *reply) 2079 { 2080 /* default to resume from last known position, if possible */ 2081 struct start_ov args = 2082 { .start_sector = mdev->ov_start_sector }; 2083 2084 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) { 2085 reply->ret_code = ERR_MANDATORY_TAG; 2086 return 0; 2087 } 2088 /* w_make_ov_request expects position to be aligned */ 2089 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT; 2090 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S)); 2091 return 0; 2092 } 2093 2094 2095 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2096 struct drbd_nl_cfg_reply *reply) 2097 { 2098 int retcode = NO_ERROR; 2099 int skip_initial_sync = 0; 2100 int err; 2101 2102 struct new_c_uuid args; 2103 2104 memset(&args, 0, sizeof(struct new_c_uuid)); 2105 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) { 2106 reply->ret_code = ERR_MANDATORY_TAG; 2107 return 0; 2108 } 2109 2110 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */ 2111 2112 if (!get_ldev(mdev)) { 2113 retcode = ERR_NO_DISK; 2114 goto out; 2115 } 2116 2117 /* this is "skip initial sync", assume to be clean */ 2118 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 && 2119 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) { 2120 dev_info(DEV, "Preparing to skip initial sync\n"); 2121 skip_initial_sync = 1; 2122 } else if (mdev->state.conn != C_STANDALONE) { 2123 retcode = ERR_CONNECTED; 2124 goto out_dec; 2125 } 2126 2127 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */ 2128 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */ 2129 2130 if (args.clear_bm) { 2131 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid"); 2132 if (err) { 2133 dev_err(DEV, "Writing bitmap failed with %d\n",err); 2134 retcode = ERR_IO_MD_DISK; 2135 } 2136 if (skip_initial_sync) { 2137 drbd_send_uuids_skip_initial_sync(mdev); 2138 _drbd_uuid_set(mdev, UI_BITMAP, 0); 2139 spin_lock_irq(&mdev->req_lock); 2140 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 2141 CS_VERBOSE, NULL); 2142 spin_unlock_irq(&mdev->req_lock); 2143 } 2144 } 2145 2146 drbd_md_sync(mdev); 2147 out_dec: 2148 put_ldev(mdev); 2149 out: 2150 mutex_unlock(&mdev->state_mutex); 2151 2152 reply->ret_code = retcode; 2153 return 0; 2154 } 2155 2156 struct cn_handler_struct { 2157 int (*function)(struct drbd_conf *, 2158 struct drbd_nl_cfg_req *, 2159 struct drbd_nl_cfg_reply *); 2160 int reply_body_size; 2161 }; 2162 2163 static struct cn_handler_struct cnd_table[] = { 2164 [ P_primary ] = { &drbd_nl_primary, 0 }, 2165 [ P_secondary ] = { &drbd_nl_secondary, 0 }, 2166 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 }, 2167 [ P_detach ] = { &drbd_nl_detach, 0 }, 2168 [ P_net_conf ] = { &drbd_nl_net_conf, 0 }, 2169 [ P_disconnect ] = { &drbd_nl_disconnect, 0 }, 2170 [ P_resize ] = { &drbd_nl_resize, 0 }, 2171 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 }, 2172 [ P_invalidate ] = { &drbd_nl_invalidate, 0 }, 2173 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 }, 2174 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 }, 2175 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 }, 2176 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 }, 2177 [ P_resume_io ] = { &drbd_nl_resume_io, 0 }, 2178 [ P_outdate ] = { &drbd_nl_outdate, 0 }, 2179 [ P_get_config ] = { &drbd_nl_get_config, 2180 sizeof(struct syncer_conf_tag_len_struct) + 2181 sizeof(struct disk_conf_tag_len_struct) + 2182 sizeof(struct net_conf_tag_len_struct) }, 2183 [ P_get_state ] = { &drbd_nl_get_state, 2184 sizeof(struct get_state_tag_len_struct) + 2185 sizeof(struct sync_progress_tag_len_struct) }, 2186 [ P_get_uuids ] = { &drbd_nl_get_uuids, 2187 sizeof(struct get_uuids_tag_len_struct) }, 2188 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag, 2189 sizeof(struct get_timeout_flag_tag_len_struct)}, 2190 [ P_start_ov ] = { &drbd_nl_start_ov, 0 }, 2191 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 }, 2192 }; 2193 2194 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp) 2195 { 2196 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data; 2197 struct cn_handler_struct *cm; 2198 struct cn_msg *cn_reply; 2199 struct drbd_nl_cfg_reply *reply; 2200 struct drbd_conf *mdev; 2201 int retcode, rr; 2202 int reply_size = sizeof(struct cn_msg) 2203 + sizeof(struct drbd_nl_cfg_reply) 2204 + sizeof(short int); 2205 2206 if (!try_module_get(THIS_MODULE)) { 2207 printk(KERN_ERR "drbd: try_module_get() failed!\n"); 2208 return; 2209 } 2210 2211 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) { 2212 retcode = ERR_PERM; 2213 goto fail; 2214 } 2215 2216 mdev = ensure_mdev(nlp->drbd_minor, 2217 (nlp->flags & DRBD_NL_CREATE_DEVICE)); 2218 if (!mdev) { 2219 retcode = ERR_MINOR_INVALID; 2220 goto fail; 2221 } 2222 2223 if (nlp->packet_type >= P_nl_after_last_packet) { 2224 retcode = ERR_PACKET_NR; 2225 goto fail; 2226 } 2227 2228 cm = cnd_table + nlp->packet_type; 2229 2230 /* This may happen if packet number is 0: */ 2231 if (cm->function == NULL) { 2232 retcode = ERR_PACKET_NR; 2233 goto fail; 2234 } 2235 2236 reply_size += cm->reply_body_size; 2237 2238 /* allocation not in the IO path, cqueue thread context */ 2239 cn_reply = kmalloc(reply_size, GFP_KERNEL); 2240 if (!cn_reply) { 2241 retcode = ERR_NOMEM; 2242 goto fail; 2243 } 2244 reply = (struct drbd_nl_cfg_reply *) cn_reply->data; 2245 2246 reply->packet_type = 2247 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet; 2248 reply->minor = nlp->drbd_minor; 2249 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */ 2250 /* reply->tag_list; might be modified by cm->function. */ 2251 2252 rr = cm->function(mdev, nlp, reply); 2253 2254 cn_reply->id = req->id; 2255 cn_reply->seq = req->seq; 2256 cn_reply->ack = req->ack + 1; 2257 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr; 2258 cn_reply->flags = 0; 2259 2260 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL); 2261 if (rr && rr != -ESRCH) 2262 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2263 2264 kfree(cn_reply); 2265 module_put(THIS_MODULE); 2266 return; 2267 fail: 2268 drbd_nl_send_reply(req, retcode); 2269 module_put(THIS_MODULE); 2270 } 2271 2272 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */ 2273 2274 static unsigned short * 2275 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, 2276 unsigned short len, int nul_terminated) 2277 { 2278 unsigned short l = tag_descriptions[tag_number(tag)].max_len; 2279 len = (len < l) ? len : l; 2280 put_unaligned(tag, tl++); 2281 put_unaligned(len, tl++); 2282 memcpy(tl, data, len); 2283 tl = (unsigned short*)((char*)tl + len); 2284 if (nul_terminated) 2285 *((char*)tl - 1) = 0; 2286 return tl; 2287 } 2288 2289 static unsigned short * 2290 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len) 2291 { 2292 return __tl_add_blob(tl, tag, data, len, 0); 2293 } 2294 2295 static unsigned short * 2296 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str) 2297 { 2298 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0); 2299 } 2300 2301 static unsigned short * 2302 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val) 2303 { 2304 put_unaligned(tag, tl++); 2305 switch(tag_type(tag)) { 2306 case TT_INTEGER: 2307 put_unaligned(sizeof(int), tl++); 2308 put_unaligned(*(int *)val, (int *)tl); 2309 tl = (unsigned short*)((char*)tl+sizeof(int)); 2310 break; 2311 case TT_INT64: 2312 put_unaligned(sizeof(u64), tl++); 2313 put_unaligned(*(u64 *)val, (u64 *)tl); 2314 tl = (unsigned short*)((char*)tl+sizeof(u64)); 2315 break; 2316 default: 2317 /* someone did something stupid. */ 2318 ; 2319 } 2320 return tl; 2321 } 2322 2323 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state) 2324 { 2325 char buffer[sizeof(struct cn_msg)+ 2326 sizeof(struct drbd_nl_cfg_reply)+ 2327 sizeof(struct get_state_tag_len_struct)+ 2328 sizeof(short int)]; 2329 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2330 struct drbd_nl_cfg_reply *reply = 2331 (struct drbd_nl_cfg_reply *)cn_reply->data; 2332 unsigned short *tl = reply->tag_list; 2333 2334 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2335 2336 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl); 2337 2338 put_unaligned(TT_END, tl++); /* Close the tag list */ 2339 2340 cn_reply->id.idx = CN_IDX_DRBD; 2341 cn_reply->id.val = CN_VAL_DRBD; 2342 2343 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2344 cn_reply->ack = 0; /* not used here. */ 2345 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2346 (int)((char *)tl - (char *)reply->tag_list); 2347 cn_reply->flags = 0; 2348 2349 reply->packet_type = P_get_state; 2350 reply->minor = mdev_to_minor(mdev); 2351 reply->ret_code = NO_ERROR; 2352 2353 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2354 } 2355 2356 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name) 2357 { 2358 char buffer[sizeof(struct cn_msg)+ 2359 sizeof(struct drbd_nl_cfg_reply)+ 2360 sizeof(struct call_helper_tag_len_struct)+ 2361 sizeof(short int)]; 2362 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2363 struct drbd_nl_cfg_reply *reply = 2364 (struct drbd_nl_cfg_reply *)cn_reply->data; 2365 unsigned short *tl = reply->tag_list; 2366 2367 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2368 2369 tl = tl_add_str(tl, T_helper, helper_name); 2370 put_unaligned(TT_END, tl++); /* Close the tag list */ 2371 2372 cn_reply->id.idx = CN_IDX_DRBD; 2373 cn_reply->id.val = CN_VAL_DRBD; 2374 2375 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2376 cn_reply->ack = 0; /* not used here. */ 2377 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2378 (int)((char *)tl - (char *)reply->tag_list); 2379 cn_reply->flags = 0; 2380 2381 reply->packet_type = P_call_helper; 2382 reply->minor = mdev_to_minor(mdev); 2383 reply->ret_code = NO_ERROR; 2384 2385 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2386 } 2387 2388 void drbd_bcast_ee(struct drbd_conf *mdev, 2389 const char *reason, const int dgs, 2390 const char* seen_hash, const char* calc_hash, 2391 const struct drbd_epoch_entry* e) 2392 { 2393 struct cn_msg *cn_reply; 2394 struct drbd_nl_cfg_reply *reply; 2395 unsigned short *tl; 2396 struct page *page; 2397 unsigned len; 2398 2399 if (!e) 2400 return; 2401 if (!reason || !reason[0]) 2402 return; 2403 2404 /* apparently we have to memcpy twice, first to prepare the data for the 2405 * struct cn_msg, then within cn_netlink_send from the cn_msg to the 2406 * netlink skb. */ 2407 /* receiver thread context, which is not in the writeout path (of this node), 2408 * but may be in the writeout path of the _other_ node. 2409 * GFP_NOIO to avoid potential "distributed deadlock". */ 2410 cn_reply = kmalloc( 2411 sizeof(struct cn_msg)+ 2412 sizeof(struct drbd_nl_cfg_reply)+ 2413 sizeof(struct dump_ee_tag_len_struct)+ 2414 sizeof(short int), 2415 GFP_NOIO); 2416 2417 if (!cn_reply) { 2418 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n", 2419 (unsigned long long)e->sector, e->size); 2420 return; 2421 } 2422 2423 reply = (struct drbd_nl_cfg_reply*)cn_reply->data; 2424 tl = reply->tag_list; 2425 2426 tl = tl_add_str(tl, T_dump_ee_reason, reason); 2427 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs); 2428 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs); 2429 tl = tl_add_int(tl, T_ee_sector, &e->sector); 2430 tl = tl_add_int(tl, T_ee_block_id, &e->block_id); 2431 2432 put_unaligned(T_ee_data, tl++); 2433 put_unaligned(e->size, tl++); 2434 2435 len = e->size; 2436 page = e->pages; 2437 page_chain_for_each(page) { 2438 void *d = kmap_atomic(page, KM_USER0); 2439 unsigned l = min_t(unsigned, len, PAGE_SIZE); 2440 memcpy(tl, d, l); 2441 kunmap_atomic(d, KM_USER0); 2442 tl = (unsigned short*)((char*)tl + l); 2443 len -= l; 2444 } 2445 put_unaligned(TT_END, tl++); /* Close the tag list */ 2446 2447 cn_reply->id.idx = CN_IDX_DRBD; 2448 cn_reply->id.val = CN_VAL_DRBD; 2449 2450 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq); 2451 cn_reply->ack = 0; // not used here. 2452 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2453 (int)((char*)tl - (char*)reply->tag_list); 2454 cn_reply->flags = 0; 2455 2456 reply->packet_type = P_dump_ee; 2457 reply->minor = mdev_to_minor(mdev); 2458 reply->ret_code = NO_ERROR; 2459 2460 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2461 kfree(cn_reply); 2462 } 2463 2464 void drbd_bcast_sync_progress(struct drbd_conf *mdev) 2465 { 2466 char buffer[sizeof(struct cn_msg)+ 2467 sizeof(struct drbd_nl_cfg_reply)+ 2468 sizeof(struct sync_progress_tag_len_struct)+ 2469 sizeof(short int)]; 2470 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2471 struct drbd_nl_cfg_reply *reply = 2472 (struct drbd_nl_cfg_reply *)cn_reply->data; 2473 unsigned short *tl = reply->tag_list; 2474 unsigned long rs_left; 2475 unsigned int res; 2476 2477 /* no local ref, no bitmap, no syncer progress, no broadcast. */ 2478 if (!get_ldev(mdev)) 2479 return; 2480 drbd_get_syncer_progress(mdev, &rs_left, &res); 2481 put_ldev(mdev); 2482 2483 tl = tl_add_int(tl, T_sync_progress, &res); 2484 put_unaligned(TT_END, tl++); /* Close the tag list */ 2485 2486 cn_reply->id.idx = CN_IDX_DRBD; 2487 cn_reply->id.val = CN_VAL_DRBD; 2488 2489 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2490 cn_reply->ack = 0; /* not used here. */ 2491 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2492 (int)((char *)tl - (char *)reply->tag_list); 2493 cn_reply->flags = 0; 2494 2495 reply->packet_type = P_sync_progress; 2496 reply->minor = mdev_to_minor(mdev); 2497 reply->ret_code = NO_ERROR; 2498 2499 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2500 } 2501 2502 int __init drbd_nl_init(void) 2503 { 2504 static struct cb_id cn_id_drbd; 2505 int err, try=10; 2506 2507 cn_id_drbd.val = CN_VAL_DRBD; 2508 do { 2509 cn_id_drbd.idx = cn_idx; 2510 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback); 2511 if (!err) 2512 break; 2513 cn_idx = (cn_idx + CN_IDX_STEP); 2514 } while (try--); 2515 2516 if (err) { 2517 printk(KERN_ERR "drbd: cn_drbd failed to register\n"); 2518 return err; 2519 } 2520 2521 return 0; 2522 } 2523 2524 void drbd_nl_cleanup(void) 2525 { 2526 static struct cb_id cn_id_drbd; 2527 2528 cn_id_drbd.idx = cn_idx; 2529 cn_id_drbd.val = CN_VAL_DRBD; 2530 2531 cn_del_callback(&cn_id_drbd); 2532 } 2533 2534 void drbd_nl_send_reply(struct cn_msg *req, int ret_code) 2535 { 2536 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)]; 2537 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2538 struct drbd_nl_cfg_reply *reply = 2539 (struct drbd_nl_cfg_reply *)cn_reply->data; 2540 int rr; 2541 2542 cn_reply->id = req->id; 2543 2544 cn_reply->seq = req->seq; 2545 cn_reply->ack = req->ack + 1; 2546 cn_reply->len = sizeof(struct drbd_nl_cfg_reply); 2547 cn_reply->flags = 0; 2548 2549 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor; 2550 reply->ret_code = ret_code; 2551 2552 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2553 if (rr && rr != -ESRCH) 2554 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2555 } 2556 2557