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 } 873 874 /* allocation not in the IO path, cqueue thread context */ 875 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL); 876 if (!nbc) { 877 retcode = ERR_NOMEM; 878 goto fail; 879 } 880 881 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF; 882 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF; 883 nbc->dc.fencing = DRBD_FENCING_DEF; 884 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF; 885 886 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) { 887 retcode = ERR_MANDATORY_TAG; 888 goto fail; 889 } 890 891 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) { 892 retcode = ERR_MD_IDX_INVALID; 893 goto fail; 894 } 895 896 if (get_net_conf(mdev)) { 897 int prot = mdev->net_conf->wire_protocol; 898 put_net_conf(mdev); 899 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) { 900 retcode = ERR_STONITH_AND_PROT_A; 901 goto fail; 902 } 903 } 904 905 nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0); 906 if (IS_ERR(nbc->lo_file)) { 907 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev, 908 PTR_ERR(nbc->lo_file)); 909 nbc->lo_file = NULL; 910 retcode = ERR_OPEN_DISK; 911 goto fail; 912 } 913 914 inode = nbc->lo_file->f_dentry->d_inode; 915 916 if (!S_ISBLK(inode->i_mode)) { 917 retcode = ERR_DISK_NOT_BDEV; 918 goto fail; 919 } 920 921 nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0); 922 if (IS_ERR(nbc->md_file)) { 923 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev, 924 PTR_ERR(nbc->md_file)); 925 nbc->md_file = NULL; 926 retcode = ERR_OPEN_MD_DISK; 927 goto fail; 928 } 929 930 inode2 = nbc->md_file->f_dentry->d_inode; 931 932 if (!S_ISBLK(inode2->i_mode)) { 933 retcode = ERR_MD_NOT_BDEV; 934 goto fail; 935 } 936 937 nbc->backing_bdev = inode->i_bdev; 938 if (bd_claim(nbc->backing_bdev, mdev)) { 939 printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n", 940 nbc->backing_bdev, mdev, 941 nbc->backing_bdev->bd_holder, 942 nbc->backing_bdev->bd_contains->bd_holder, 943 nbc->backing_bdev->bd_holders); 944 retcode = ERR_BDCLAIM_DISK; 945 goto fail; 946 } 947 948 resync_lru = lc_create("resync", drbd_bm_ext_cache, 949 61, sizeof(struct bm_extent), 950 offsetof(struct bm_extent, lce)); 951 if (!resync_lru) { 952 retcode = ERR_NOMEM; 953 goto release_bdev_fail; 954 } 955 956 /* meta_dev_idx >= 0: external fixed size, 957 * possibly multiple drbd sharing one meta device. 958 * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is 959 * not yet used by some other drbd minor! 960 * (if you use drbd.conf + drbdadm, 961 * that should check it for you already; but if you don't, or someone 962 * fooled it, we need to double check here) */ 963 nbc->md_bdev = inode2->i_bdev; 964 if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev 965 : (void *) drbd_m_holder)) { 966 retcode = ERR_BDCLAIM_MD_DISK; 967 goto release_bdev_fail; 968 } 969 970 if ((nbc->backing_bdev == nbc->md_bdev) != 971 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL || 972 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) { 973 retcode = ERR_MD_IDX_INVALID; 974 goto release_bdev2_fail; 975 } 976 977 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */ 978 drbd_md_set_sector_offsets(mdev, nbc); 979 980 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) { 981 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n", 982 (unsigned long long) drbd_get_max_capacity(nbc), 983 (unsigned long long) nbc->dc.disk_size); 984 retcode = ERR_DISK_TO_SMALL; 985 goto release_bdev2_fail; 986 } 987 988 if (nbc->dc.meta_dev_idx < 0) { 989 max_possible_sectors = DRBD_MAX_SECTORS_FLEX; 990 /* at least one MB, otherwise it does not make sense */ 991 min_md_device_sectors = (2<<10); 992 } else { 993 max_possible_sectors = DRBD_MAX_SECTORS; 994 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1); 995 } 996 997 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) { 998 retcode = ERR_MD_DISK_TO_SMALL; 999 dev_warn(DEV, "refusing attach: md-device too small, " 1000 "at least %llu sectors needed for this meta-disk type\n", 1001 (unsigned long long) min_md_device_sectors); 1002 goto release_bdev2_fail; 1003 } 1004 1005 /* Make sure the new disk is big enough 1006 * (we may currently be R_PRIMARY with no local disk...) */ 1007 if (drbd_get_max_capacity(nbc) < 1008 drbd_get_capacity(mdev->this_bdev)) { 1009 retcode = ERR_DISK_TO_SMALL; 1010 goto release_bdev2_fail; 1011 } 1012 1013 nbc->known_size = drbd_get_capacity(nbc->backing_bdev); 1014 1015 if (nbc->known_size > max_possible_sectors) { 1016 dev_warn(DEV, "==> truncating very big lower level device " 1017 "to currently maximum possible %llu sectors <==\n", 1018 (unsigned long long) max_possible_sectors); 1019 if (nbc->dc.meta_dev_idx >= 0) 1020 dev_warn(DEV, "==>> using internal or flexible " 1021 "meta data may help <<==\n"); 1022 } 1023 1024 drbd_suspend_io(mdev); 1025 /* also wait for the last barrier ack. */ 1026 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state)); 1027 /* and for any other previously queued work */ 1028 drbd_flush_workqueue(mdev); 1029 1030 retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE); 1031 drbd_resume_io(mdev); 1032 if (retcode < SS_SUCCESS) 1033 goto release_bdev2_fail; 1034 1035 if (!get_ldev_if_state(mdev, D_ATTACHING)) 1036 goto force_diskless; 1037 1038 drbd_md_set_sector_offsets(mdev, nbc); 1039 1040 /* allocate a second IO page if logical_block_size != 512 */ 1041 logical_block_size = bdev_logical_block_size(nbc->md_bdev); 1042 if (logical_block_size == 0) 1043 logical_block_size = MD_SECTOR_SIZE; 1044 1045 if (logical_block_size != MD_SECTOR_SIZE) { 1046 if (!mdev->md_io_tmpp) { 1047 struct page *page = alloc_page(GFP_NOIO); 1048 if (!page) 1049 goto force_diskless_dec; 1050 1051 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n", 1052 logical_block_size, MD_SECTOR_SIZE); 1053 dev_warn(DEV, "Workaround engaged (has performance impact).\n"); 1054 1055 mdev->md_io_tmpp = page; 1056 } 1057 } 1058 1059 if (!mdev->bitmap) { 1060 if (drbd_bm_init(mdev)) { 1061 retcode = ERR_NOMEM; 1062 goto force_diskless_dec; 1063 } 1064 } 1065 1066 retcode = drbd_md_read(mdev, nbc); 1067 if (retcode != NO_ERROR) 1068 goto force_diskless_dec; 1069 1070 if (mdev->state.conn < C_CONNECTED && 1071 mdev->state.role == R_PRIMARY && 1072 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) { 1073 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n", 1074 (unsigned long long)mdev->ed_uuid); 1075 retcode = ERR_DATA_NOT_CURRENT; 1076 goto force_diskless_dec; 1077 } 1078 1079 /* Since we are diskless, fix the activity log first... */ 1080 if (drbd_check_al_size(mdev)) { 1081 retcode = ERR_NOMEM; 1082 goto force_diskless_dec; 1083 } 1084 1085 /* Prevent shrinking of consistent devices ! */ 1086 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) && 1087 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) { 1088 dev_warn(DEV, "refusing to truncate a consistent device\n"); 1089 retcode = ERR_DISK_TO_SMALL; 1090 goto force_diskless_dec; 1091 } 1092 1093 if (!drbd_al_read_log(mdev, nbc)) { 1094 retcode = ERR_IO_MD_DISK; 1095 goto force_diskless_dec; 1096 } 1097 1098 /* Reset the "barriers don't work" bits here, then force meta data to 1099 * be written, to ensure we determine if barriers are supported. */ 1100 if (nbc->dc.no_md_flush) 1101 set_bit(MD_NO_BARRIER, &mdev->flags); 1102 else 1103 clear_bit(MD_NO_BARRIER, &mdev->flags); 1104 1105 /* Point of no return reached. 1106 * Devices and memory are no longer released by error cleanup below. 1107 * now mdev takes over responsibility, and the state engine should 1108 * clean it up somewhere. */ 1109 D_ASSERT(mdev->ldev == NULL); 1110 mdev->ldev = nbc; 1111 mdev->resync = resync_lru; 1112 nbc = NULL; 1113 resync_lru = NULL; 1114 1115 mdev->write_ordering = WO_bio_barrier; 1116 drbd_bump_write_ordering(mdev, WO_bio_barrier); 1117 1118 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY)) 1119 set_bit(CRASHED_PRIMARY, &mdev->flags); 1120 else 1121 clear_bit(CRASHED_PRIMARY, &mdev->flags); 1122 1123 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && 1124 !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) { 1125 set_bit(CRASHED_PRIMARY, &mdev->flags); 1126 cp_discovered = 1; 1127 } 1128 1129 mdev->send_cnt = 0; 1130 mdev->recv_cnt = 0; 1131 mdev->read_cnt = 0; 1132 mdev->writ_cnt = 0; 1133 1134 max_seg_s = DRBD_MAX_SEGMENT_SIZE; 1135 if (mdev->state.conn == C_CONNECTED) { 1136 /* We are Primary, Connected, and now attach a new local 1137 * backing store. We must not increase the user visible maximum 1138 * bio size on this device to something the peer may not be 1139 * able to handle. */ 1140 if (mdev->agreed_pro_version < 94) 1141 max_seg_s = queue_max_segment_size(mdev->rq_queue); 1142 else if (mdev->agreed_pro_version == 94) 1143 max_seg_s = DRBD_MAX_SIZE_H80_PACKET; 1144 /* else: drbd 8.3.9 and later, stay with default */ 1145 } 1146 1147 drbd_setup_queue_param(mdev, max_seg_s); 1148 1149 /* If I am currently not R_PRIMARY, 1150 * but meta data primary indicator is set, 1151 * I just now recover from a hard crash, 1152 * and have been R_PRIMARY before that crash. 1153 * 1154 * Now, if I had no connection before that crash 1155 * (have been degraded R_PRIMARY), chances are that 1156 * I won't find my peer now either. 1157 * 1158 * In that case, and _only_ in that case, 1159 * we use the degr-wfc-timeout instead of the default, 1160 * so we can automatically recover from a crash of a 1161 * degraded but active "cluster" after a certain timeout. 1162 */ 1163 clear_bit(USE_DEGR_WFC_T, &mdev->flags); 1164 if (mdev->state.role != R_PRIMARY && 1165 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && 1166 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND)) 1167 set_bit(USE_DEGR_WFC_T, &mdev->flags); 1168 1169 dd = drbd_determin_dev_size(mdev, 0); 1170 if (dd == dev_size_error) { 1171 retcode = ERR_NOMEM_BITMAP; 1172 goto force_diskless_dec; 1173 } else if (dd == grew) 1174 set_bit(RESYNC_AFTER_NEG, &mdev->flags); 1175 1176 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { 1177 dev_info(DEV, "Assuming that all blocks are out of sync " 1178 "(aka FullSync)\n"); 1179 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) { 1180 retcode = ERR_IO_MD_DISK; 1181 goto force_diskless_dec; 1182 } 1183 } else { 1184 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) { 1185 retcode = ERR_IO_MD_DISK; 1186 goto force_diskless_dec; 1187 } 1188 } 1189 1190 if (cp_discovered) { 1191 drbd_al_apply_to_bm(mdev); 1192 drbd_al_to_on_disk_bm(mdev); 1193 } 1194 1195 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev)) 1196 drbd_suspend_al(mdev); /* IO is still suspended here... */ 1197 1198 spin_lock_irq(&mdev->req_lock); 1199 os = mdev->state; 1200 ns.i = os.i; 1201 /* If MDF_CONSISTENT is not set go into inconsistent state, 1202 otherwise investigate MDF_WasUpToDate... 1203 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state, 1204 otherwise into D_CONSISTENT state. 1205 */ 1206 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) { 1207 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE)) 1208 ns.disk = D_CONSISTENT; 1209 else 1210 ns.disk = D_OUTDATED; 1211 } else { 1212 ns.disk = D_INCONSISTENT; 1213 } 1214 1215 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED)) 1216 ns.pdsk = D_OUTDATED; 1217 1218 if ( ns.disk == D_CONSISTENT && 1219 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE)) 1220 ns.disk = D_UP_TO_DATE; 1221 1222 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND, 1223 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before 1224 this point, because drbd_request_state() modifies these 1225 flags. */ 1226 1227 /* In case we are C_CONNECTED postpone any decision on the new disk 1228 state after the negotiation phase. */ 1229 if (mdev->state.conn == C_CONNECTED) { 1230 mdev->new_state_tmp.i = ns.i; 1231 ns.i = os.i; 1232 ns.disk = D_NEGOTIATING; 1233 1234 /* We expect to receive up-to-date UUIDs soon. 1235 To avoid a race in receive_state, free p_uuid while 1236 holding req_lock. I.e. atomic with the state change */ 1237 kfree(mdev->p_uuid); 1238 mdev->p_uuid = NULL; 1239 } 1240 1241 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 1242 ns = mdev->state; 1243 spin_unlock_irq(&mdev->req_lock); 1244 1245 if (rv < SS_SUCCESS) 1246 goto force_diskless_dec; 1247 1248 if (mdev->state.role == R_PRIMARY) 1249 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1; 1250 else 1251 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; 1252 1253 drbd_md_mark_dirty(mdev); 1254 drbd_md_sync(mdev); 1255 1256 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1257 put_ldev(mdev); 1258 reply->ret_code = retcode; 1259 drbd_reconfig_done(mdev); 1260 return 0; 1261 1262 force_diskless_dec: 1263 put_ldev(mdev); 1264 force_diskless: 1265 drbd_force_state(mdev, NS(disk, D_DISKLESS)); 1266 drbd_md_sync(mdev); 1267 release_bdev2_fail: 1268 if (nbc) 1269 bd_release(nbc->md_bdev); 1270 release_bdev_fail: 1271 if (nbc) 1272 bd_release(nbc->backing_bdev); 1273 fail: 1274 if (nbc) { 1275 if (nbc->lo_file) 1276 fput(nbc->lo_file); 1277 if (nbc->md_file) 1278 fput(nbc->md_file); 1279 kfree(nbc); 1280 } 1281 lc_destroy(resync_lru); 1282 1283 reply->ret_code = retcode; 1284 drbd_reconfig_done(mdev); 1285 return 0; 1286 } 1287 1288 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1289 struct drbd_nl_cfg_reply *reply) 1290 { 1291 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS)); 1292 return 0; 1293 } 1294 1295 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1296 struct drbd_nl_cfg_reply *reply) 1297 { 1298 int i, ns; 1299 enum drbd_ret_codes retcode; 1300 struct net_conf *new_conf = NULL; 1301 struct crypto_hash *tfm = NULL; 1302 struct crypto_hash *integrity_w_tfm = NULL; 1303 struct crypto_hash *integrity_r_tfm = NULL; 1304 struct hlist_head *new_tl_hash = NULL; 1305 struct hlist_head *new_ee_hash = NULL; 1306 struct drbd_conf *odev; 1307 char hmac_name[CRYPTO_MAX_ALG_NAME]; 1308 void *int_dig_out = NULL; 1309 void *int_dig_in = NULL; 1310 void *int_dig_vv = NULL; 1311 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr; 1312 1313 drbd_reconfig_start(mdev); 1314 1315 if (mdev->state.conn > C_STANDALONE) { 1316 retcode = ERR_NET_CONFIGURED; 1317 goto fail; 1318 } 1319 1320 /* allocation not in the IO path, cqueue thread context */ 1321 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 1322 if (!new_conf) { 1323 retcode = ERR_NOMEM; 1324 goto fail; 1325 } 1326 1327 new_conf->timeout = DRBD_TIMEOUT_DEF; 1328 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF; 1329 new_conf->ping_int = DRBD_PING_INT_DEF; 1330 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF; 1331 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF; 1332 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF; 1333 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF; 1334 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF; 1335 new_conf->ko_count = DRBD_KO_COUNT_DEF; 1336 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF; 1337 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF; 1338 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF; 1339 new_conf->want_lose = 0; 1340 new_conf->two_primaries = 0; 1341 new_conf->wire_protocol = DRBD_PROT_C; 1342 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF; 1343 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF; 1344 1345 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) { 1346 retcode = ERR_MANDATORY_TAG; 1347 goto fail; 1348 } 1349 1350 if (new_conf->two_primaries 1351 && (new_conf->wire_protocol != DRBD_PROT_C)) { 1352 retcode = ERR_NOT_PROTO_C; 1353 goto fail; 1354 } 1355 1356 if (get_ldev(mdev)) { 1357 enum drbd_fencing_p fp = mdev->ldev->dc.fencing; 1358 put_ldev(mdev); 1359 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) { 1360 retcode = ERR_STONITH_AND_PROT_A; 1361 goto fail; 1362 } 1363 } 1364 1365 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) { 1366 retcode = ERR_DISCARD; 1367 goto fail; 1368 } 1369 1370 retcode = NO_ERROR; 1371 1372 new_my_addr = (struct sockaddr *)&new_conf->my_addr; 1373 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr; 1374 for (i = 0; i < minor_count; i++) { 1375 odev = minor_to_mdev(i); 1376 if (!odev || odev == mdev) 1377 continue; 1378 if (get_net_conf(odev)) { 1379 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr; 1380 if (new_conf->my_addr_len == odev->net_conf->my_addr_len && 1381 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len)) 1382 retcode = ERR_LOCAL_ADDR; 1383 1384 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr; 1385 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len && 1386 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len)) 1387 retcode = ERR_PEER_ADDR; 1388 1389 put_net_conf(odev); 1390 if (retcode != NO_ERROR) 1391 goto fail; 1392 } 1393 } 1394 1395 if (new_conf->cram_hmac_alg[0] != 0) { 1396 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", 1397 new_conf->cram_hmac_alg); 1398 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC); 1399 if (IS_ERR(tfm)) { 1400 tfm = NULL; 1401 retcode = ERR_AUTH_ALG; 1402 goto fail; 1403 } 1404 1405 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 1406 retcode = ERR_AUTH_ALG_ND; 1407 goto fail; 1408 } 1409 } 1410 1411 if (new_conf->integrity_alg[0]) { 1412 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1413 if (IS_ERR(integrity_w_tfm)) { 1414 integrity_w_tfm = NULL; 1415 retcode=ERR_INTEGRITY_ALG; 1416 goto fail; 1417 } 1418 1419 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) { 1420 retcode=ERR_INTEGRITY_ALG_ND; 1421 goto fail; 1422 } 1423 1424 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1425 if (IS_ERR(integrity_r_tfm)) { 1426 integrity_r_tfm = NULL; 1427 retcode=ERR_INTEGRITY_ALG; 1428 goto fail; 1429 } 1430 } 1431 1432 ns = new_conf->max_epoch_size/8; 1433 if (mdev->tl_hash_s != ns) { 1434 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1435 if (!new_tl_hash) { 1436 retcode = ERR_NOMEM; 1437 goto fail; 1438 } 1439 } 1440 1441 ns = new_conf->max_buffers/8; 1442 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) { 1443 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1444 if (!new_ee_hash) { 1445 retcode = ERR_NOMEM; 1446 goto fail; 1447 } 1448 } 1449 1450 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0; 1451 1452 if (integrity_w_tfm) { 1453 i = crypto_hash_digestsize(integrity_w_tfm); 1454 int_dig_out = kmalloc(i, GFP_KERNEL); 1455 if (!int_dig_out) { 1456 retcode = ERR_NOMEM; 1457 goto fail; 1458 } 1459 int_dig_in = kmalloc(i, GFP_KERNEL); 1460 if (!int_dig_in) { 1461 retcode = ERR_NOMEM; 1462 goto fail; 1463 } 1464 int_dig_vv = kmalloc(i, GFP_KERNEL); 1465 if (!int_dig_vv) { 1466 retcode = ERR_NOMEM; 1467 goto fail; 1468 } 1469 } 1470 1471 if (!mdev->bitmap) { 1472 if(drbd_bm_init(mdev)) { 1473 retcode = ERR_NOMEM; 1474 goto fail; 1475 } 1476 } 1477 1478 drbd_flush_workqueue(mdev); 1479 spin_lock_irq(&mdev->req_lock); 1480 if (mdev->net_conf != NULL) { 1481 retcode = ERR_NET_CONFIGURED; 1482 spin_unlock_irq(&mdev->req_lock); 1483 goto fail; 1484 } 1485 mdev->net_conf = new_conf; 1486 1487 mdev->send_cnt = 0; 1488 mdev->recv_cnt = 0; 1489 1490 if (new_tl_hash) { 1491 kfree(mdev->tl_hash); 1492 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8; 1493 mdev->tl_hash = new_tl_hash; 1494 } 1495 1496 if (new_ee_hash) { 1497 kfree(mdev->ee_hash); 1498 mdev->ee_hash_s = mdev->net_conf->max_buffers/8; 1499 mdev->ee_hash = new_ee_hash; 1500 } 1501 1502 crypto_free_hash(mdev->cram_hmac_tfm); 1503 mdev->cram_hmac_tfm = tfm; 1504 1505 crypto_free_hash(mdev->integrity_w_tfm); 1506 mdev->integrity_w_tfm = integrity_w_tfm; 1507 1508 crypto_free_hash(mdev->integrity_r_tfm); 1509 mdev->integrity_r_tfm = integrity_r_tfm; 1510 1511 kfree(mdev->int_dig_out); 1512 kfree(mdev->int_dig_in); 1513 kfree(mdev->int_dig_vv); 1514 mdev->int_dig_out=int_dig_out; 1515 mdev->int_dig_in=int_dig_in; 1516 mdev->int_dig_vv=int_dig_vv; 1517 retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL); 1518 spin_unlock_irq(&mdev->req_lock); 1519 1520 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1521 reply->ret_code = retcode; 1522 drbd_reconfig_done(mdev); 1523 return 0; 1524 1525 fail: 1526 kfree(int_dig_out); 1527 kfree(int_dig_in); 1528 kfree(int_dig_vv); 1529 crypto_free_hash(tfm); 1530 crypto_free_hash(integrity_w_tfm); 1531 crypto_free_hash(integrity_r_tfm); 1532 kfree(new_tl_hash); 1533 kfree(new_ee_hash); 1534 kfree(new_conf); 1535 1536 reply->ret_code = retcode; 1537 drbd_reconfig_done(mdev); 1538 return 0; 1539 } 1540 1541 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1542 struct drbd_nl_cfg_reply *reply) 1543 { 1544 int retcode; 1545 1546 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED); 1547 1548 if (retcode == SS_NOTHING_TO_DO) 1549 goto done; 1550 else if (retcode == SS_ALREADY_STANDALONE) 1551 goto done; 1552 else if (retcode == SS_PRIMARY_NOP) { 1553 /* Our statche checking code wants to see the peer outdated. */ 1554 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1555 pdsk, D_OUTDATED)); 1556 } else if (retcode == SS_CW_FAILED_BY_PEER) { 1557 /* The peer probably wants to see us outdated. */ 1558 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1559 disk, D_OUTDATED), 1560 CS_ORDERED); 1561 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) { 1562 drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 1563 retcode = SS_SUCCESS; 1564 } 1565 } 1566 1567 if (retcode < SS_SUCCESS) 1568 goto fail; 1569 1570 if (wait_event_interruptible(mdev->state_wait, 1571 mdev->state.conn != C_DISCONNECTING)) { 1572 /* Do not test for mdev->state.conn == C_STANDALONE, since 1573 someone else might connect us in the mean time! */ 1574 retcode = ERR_INTR; 1575 goto fail; 1576 } 1577 1578 done: 1579 retcode = NO_ERROR; 1580 fail: 1581 drbd_md_sync(mdev); 1582 reply->ret_code = retcode; 1583 return 0; 1584 } 1585 1586 void resync_after_online_grow(struct drbd_conf *mdev) 1587 { 1588 int iass; /* I am sync source */ 1589 1590 dev_info(DEV, "Resync of new storage after online grow\n"); 1591 if (mdev->state.role != mdev->state.peer) 1592 iass = (mdev->state.role == R_PRIMARY); 1593 else 1594 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1595 1596 if (iass) 1597 drbd_start_resync(mdev, C_SYNC_SOURCE); 1598 else 1599 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE); 1600 } 1601 1602 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1603 struct drbd_nl_cfg_reply *reply) 1604 { 1605 struct resize rs; 1606 int retcode = NO_ERROR; 1607 enum determine_dev_size dd; 1608 enum dds_flags ddsf; 1609 1610 memset(&rs, 0, sizeof(struct resize)); 1611 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) { 1612 retcode = ERR_MANDATORY_TAG; 1613 goto fail; 1614 } 1615 1616 if (mdev->state.conn > C_CONNECTED) { 1617 retcode = ERR_RESIZE_RESYNC; 1618 goto fail; 1619 } 1620 1621 if (mdev->state.role == R_SECONDARY && 1622 mdev->state.peer == R_SECONDARY) { 1623 retcode = ERR_NO_PRIMARY; 1624 goto fail; 1625 } 1626 1627 if (!get_ldev(mdev)) { 1628 retcode = ERR_NO_DISK; 1629 goto fail; 1630 } 1631 1632 if (rs.no_resync && mdev->agreed_pro_version < 93) { 1633 retcode = ERR_NEED_APV_93; 1634 goto fail; 1635 } 1636 1637 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) 1638 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 1639 1640 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size; 1641 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0); 1642 dd = drbd_determin_dev_size(mdev, ddsf); 1643 drbd_md_sync(mdev); 1644 put_ldev(mdev); 1645 if (dd == dev_size_error) { 1646 retcode = ERR_NOMEM_BITMAP; 1647 goto fail; 1648 } 1649 1650 if (mdev->state.conn == C_CONNECTED) { 1651 if (dd == grew) 1652 set_bit(RESIZE_PENDING, &mdev->flags); 1653 1654 drbd_send_uuids(mdev); 1655 drbd_send_sizes(mdev, 1, ddsf); 1656 } 1657 1658 fail: 1659 reply->ret_code = retcode; 1660 return 0; 1661 } 1662 1663 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1664 struct drbd_nl_cfg_reply *reply) 1665 { 1666 int retcode = NO_ERROR; 1667 int err; 1668 int ovr; /* online verify running */ 1669 int rsr; /* re-sync running */ 1670 struct crypto_hash *verify_tfm = NULL; 1671 struct crypto_hash *csums_tfm = NULL; 1672 struct syncer_conf sc; 1673 cpumask_var_t new_cpu_mask; 1674 int *rs_plan_s = NULL; 1675 int fifo_size; 1676 1677 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) { 1678 retcode = ERR_NOMEM; 1679 goto fail; 1680 } 1681 1682 if (nlp->flags & DRBD_NL_SET_DEFAULTS) { 1683 memset(&sc, 0, sizeof(struct syncer_conf)); 1684 sc.rate = DRBD_RATE_DEF; 1685 sc.after = DRBD_AFTER_DEF; 1686 sc.al_extents = DRBD_AL_EXTENTS_DEF; 1687 sc.on_no_data = DRBD_ON_NO_DATA_DEF; 1688 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF; 1689 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF; 1690 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF; 1691 sc.c_max_rate = DRBD_C_MAX_RATE_DEF; 1692 sc.c_min_rate = DRBD_C_MIN_RATE_DEF; 1693 } else 1694 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf)); 1695 1696 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) { 1697 retcode = ERR_MANDATORY_TAG; 1698 goto fail; 1699 } 1700 1701 /* re-sync running */ 1702 rsr = ( mdev->state.conn == C_SYNC_SOURCE || 1703 mdev->state.conn == C_SYNC_TARGET || 1704 mdev->state.conn == C_PAUSED_SYNC_S || 1705 mdev->state.conn == C_PAUSED_SYNC_T ); 1706 1707 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) { 1708 retcode = ERR_CSUMS_RESYNC_RUNNING; 1709 goto fail; 1710 } 1711 1712 if (!rsr && sc.csums_alg[0]) { 1713 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC); 1714 if (IS_ERR(csums_tfm)) { 1715 csums_tfm = NULL; 1716 retcode = ERR_CSUMS_ALG; 1717 goto fail; 1718 } 1719 1720 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) { 1721 retcode = ERR_CSUMS_ALG_ND; 1722 goto fail; 1723 } 1724 } 1725 1726 /* online verify running */ 1727 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T); 1728 1729 if (ovr) { 1730 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) { 1731 retcode = ERR_VERIFY_RUNNING; 1732 goto fail; 1733 } 1734 } 1735 1736 if (!ovr && sc.verify_alg[0]) { 1737 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC); 1738 if (IS_ERR(verify_tfm)) { 1739 verify_tfm = NULL; 1740 retcode = ERR_VERIFY_ALG; 1741 goto fail; 1742 } 1743 1744 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) { 1745 retcode = ERR_VERIFY_ALG_ND; 1746 goto fail; 1747 } 1748 } 1749 1750 /* silently ignore cpu mask on UP kernel */ 1751 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) { 1752 err = __bitmap_parse(sc.cpu_mask, 32, 0, 1753 cpumask_bits(new_cpu_mask), nr_cpu_ids); 1754 if (err) { 1755 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err); 1756 retcode = ERR_CPU_MASK_PARSE; 1757 goto fail; 1758 } 1759 } 1760 1761 ERR_IF (sc.rate < 1) sc.rate = 1; 1762 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */ 1763 #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT) 1764 if (sc.al_extents > AL_MAX) { 1765 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX); 1766 sc.al_extents = AL_MAX; 1767 } 1768 #undef AL_MAX 1769 1770 /* to avoid spurious errors when configuring minors before configuring 1771 * the minors they depend on: if necessary, first create the minor we 1772 * depend on */ 1773 if (sc.after >= 0) 1774 ensure_mdev(sc.after, 1); 1775 1776 /* most sanity checks done, try to assign the new sync-after 1777 * dependency. need to hold the global lock in there, 1778 * to avoid a race in the dependency loop check. */ 1779 retcode = drbd_alter_sa(mdev, sc.after); 1780 if (retcode != NO_ERROR) 1781 goto fail; 1782 1783 fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 1784 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 1785 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 1786 if (!rs_plan_s) { 1787 dev_err(DEV, "kmalloc of fifo_buffer failed"); 1788 retcode = ERR_NOMEM; 1789 goto fail; 1790 } 1791 } 1792 1793 /* ok, assign the rest of it as well. 1794 * lock against receive_SyncParam() */ 1795 spin_lock(&mdev->peer_seq_lock); 1796 mdev->sync_conf = sc; 1797 1798 if (!rsr) { 1799 crypto_free_hash(mdev->csums_tfm); 1800 mdev->csums_tfm = csums_tfm; 1801 csums_tfm = NULL; 1802 } 1803 1804 if (!ovr) { 1805 crypto_free_hash(mdev->verify_tfm); 1806 mdev->verify_tfm = verify_tfm; 1807 verify_tfm = NULL; 1808 } 1809 1810 if (fifo_size != mdev->rs_plan_s.size) { 1811 kfree(mdev->rs_plan_s.values); 1812 mdev->rs_plan_s.values = rs_plan_s; 1813 mdev->rs_plan_s.size = fifo_size; 1814 mdev->rs_planed = 0; 1815 rs_plan_s = NULL; 1816 } 1817 1818 spin_unlock(&mdev->peer_seq_lock); 1819 1820 if (get_ldev(mdev)) { 1821 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); 1822 drbd_al_shrink(mdev); 1823 err = drbd_check_al_size(mdev); 1824 lc_unlock(mdev->act_log); 1825 wake_up(&mdev->al_wait); 1826 1827 put_ldev(mdev); 1828 drbd_md_sync(mdev); 1829 1830 if (err) { 1831 retcode = ERR_NOMEM; 1832 goto fail; 1833 } 1834 } 1835 1836 if (mdev->state.conn >= C_CONNECTED) 1837 drbd_send_sync_param(mdev, &sc); 1838 1839 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) { 1840 cpumask_copy(mdev->cpu_mask, new_cpu_mask); 1841 drbd_calc_cpu_mask(mdev); 1842 mdev->receiver.reset_cpu_mask = 1; 1843 mdev->asender.reset_cpu_mask = 1; 1844 mdev->worker.reset_cpu_mask = 1; 1845 } 1846 1847 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1848 fail: 1849 kfree(rs_plan_s); 1850 free_cpumask_var(new_cpu_mask); 1851 crypto_free_hash(csums_tfm); 1852 crypto_free_hash(verify_tfm); 1853 reply->ret_code = retcode; 1854 return 0; 1855 } 1856 1857 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1858 struct drbd_nl_cfg_reply *reply) 1859 { 1860 int retcode; 1861 1862 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED); 1863 1864 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION) 1865 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1866 1867 while (retcode == SS_NEED_CONNECTION) { 1868 spin_lock_irq(&mdev->req_lock); 1869 if (mdev->state.conn < C_CONNECTED) 1870 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL); 1871 spin_unlock_irq(&mdev->req_lock); 1872 1873 if (retcode != SS_NEED_CONNECTION) 1874 break; 1875 1876 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1877 } 1878 1879 reply->ret_code = retcode; 1880 return 0; 1881 } 1882 1883 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev) 1884 { 1885 int rv; 1886 1887 rv = drbd_bmio_set_n_write(mdev); 1888 drbd_suspend_al(mdev); 1889 return rv; 1890 } 1891 1892 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1893 struct drbd_nl_cfg_reply *reply) 1894 { 1895 int retcode; 1896 1897 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED); 1898 1899 if (retcode < SS_SUCCESS) { 1900 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) { 1901 /* The peer will get a resync upon connect anyways. Just make that 1902 into a full resync. */ 1903 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT)); 1904 if (retcode >= SS_SUCCESS) { 1905 /* open coded drbd_bitmap_io() */ 1906 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al, 1907 "set_n_write from invalidate_peer")) 1908 retcode = ERR_IO_MD_DISK; 1909 } 1910 } else 1911 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S)); 1912 } 1913 1914 reply->ret_code = retcode; 1915 return 0; 1916 } 1917 1918 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1919 struct drbd_nl_cfg_reply *reply) 1920 { 1921 int retcode = NO_ERROR; 1922 1923 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO) 1924 retcode = ERR_PAUSE_IS_SET; 1925 1926 reply->ret_code = retcode; 1927 return 0; 1928 } 1929 1930 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1931 struct drbd_nl_cfg_reply *reply) 1932 { 1933 int retcode = NO_ERROR; 1934 1935 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) 1936 retcode = ERR_PAUSE_IS_CLEAR; 1937 1938 reply->ret_code = retcode; 1939 return 0; 1940 } 1941 1942 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1943 struct drbd_nl_cfg_reply *reply) 1944 { 1945 reply->ret_code = drbd_request_state(mdev, NS(susp, 1)); 1946 1947 return 0; 1948 } 1949 1950 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1951 struct drbd_nl_cfg_reply *reply) 1952 { 1953 if (test_bit(NEW_CUR_UUID, &mdev->flags)) { 1954 drbd_uuid_new_current(mdev); 1955 clear_bit(NEW_CUR_UUID, &mdev->flags); 1956 drbd_md_sync(mdev); 1957 } 1958 drbd_suspend_io(mdev); 1959 reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0)); 1960 if (reply->ret_code == SS_SUCCESS) { 1961 if (mdev->state.conn < C_CONNECTED) 1962 tl_clear(mdev); 1963 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED) 1964 tl_restart(mdev, fail_frozen_disk_io); 1965 } 1966 drbd_resume_io(mdev); 1967 1968 return 0; 1969 } 1970 1971 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1972 struct drbd_nl_cfg_reply *reply) 1973 { 1974 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED)); 1975 return 0; 1976 } 1977 1978 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1979 struct drbd_nl_cfg_reply *reply) 1980 { 1981 unsigned short *tl; 1982 1983 tl = reply->tag_list; 1984 1985 if (get_ldev(mdev)) { 1986 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl); 1987 put_ldev(mdev); 1988 } 1989 1990 if (get_net_conf(mdev)) { 1991 tl = net_conf_to_tags(mdev, mdev->net_conf, tl); 1992 put_net_conf(mdev); 1993 } 1994 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl); 1995 1996 put_unaligned(TT_END, tl++); /* Close the tag list */ 1997 1998 return (int)((char *)tl - (char *)reply->tag_list); 1999 } 2000 2001 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2002 struct drbd_nl_cfg_reply *reply) 2003 { 2004 unsigned short *tl = reply->tag_list; 2005 union drbd_state s = mdev->state; 2006 unsigned long rs_left; 2007 unsigned int res; 2008 2009 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl); 2010 2011 /* no local ref, no bitmap, no syncer progress. */ 2012 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) { 2013 if (get_ldev(mdev)) { 2014 drbd_get_syncer_progress(mdev, &rs_left, &res); 2015 tl = tl_add_int(tl, T_sync_progress, &res); 2016 put_ldev(mdev); 2017 } 2018 } 2019 put_unaligned(TT_END, tl++); /* Close the tag list */ 2020 2021 return (int)((char *)tl - (char *)reply->tag_list); 2022 } 2023 2024 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2025 struct drbd_nl_cfg_reply *reply) 2026 { 2027 unsigned short *tl; 2028 2029 tl = reply->tag_list; 2030 2031 if (get_ldev(mdev)) { 2032 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64)); 2033 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags); 2034 put_ldev(mdev); 2035 } 2036 put_unaligned(TT_END, tl++); /* Close the tag list */ 2037 2038 return (int)((char *)tl - (char *)reply->tag_list); 2039 } 2040 2041 /** 2042 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use 2043 * @mdev: DRBD device. 2044 * @nlp: Netlink/connector packet from drbdsetup 2045 * @reply: Reply packet for drbdsetup 2046 */ 2047 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2048 struct drbd_nl_cfg_reply *reply) 2049 { 2050 unsigned short *tl; 2051 char rv; 2052 2053 tl = reply->tag_list; 2054 2055 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED : 2056 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT; 2057 2058 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv)); 2059 put_unaligned(TT_END, tl++); /* Close the tag list */ 2060 2061 return (int)((char *)tl - (char *)reply->tag_list); 2062 } 2063 2064 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2065 struct drbd_nl_cfg_reply *reply) 2066 { 2067 /* default to resume from last known position, if possible */ 2068 struct start_ov args = 2069 { .start_sector = mdev->ov_start_sector }; 2070 2071 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) { 2072 reply->ret_code = ERR_MANDATORY_TAG; 2073 return 0; 2074 } 2075 /* w_make_ov_request expects position to be aligned */ 2076 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT; 2077 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S)); 2078 return 0; 2079 } 2080 2081 2082 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2083 struct drbd_nl_cfg_reply *reply) 2084 { 2085 int retcode = NO_ERROR; 2086 int skip_initial_sync = 0; 2087 int err; 2088 2089 struct new_c_uuid args; 2090 2091 memset(&args, 0, sizeof(struct new_c_uuid)); 2092 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) { 2093 reply->ret_code = ERR_MANDATORY_TAG; 2094 return 0; 2095 } 2096 2097 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */ 2098 2099 if (!get_ldev(mdev)) { 2100 retcode = ERR_NO_DISK; 2101 goto out; 2102 } 2103 2104 /* this is "skip initial sync", assume to be clean */ 2105 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 && 2106 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) { 2107 dev_info(DEV, "Preparing to skip initial sync\n"); 2108 skip_initial_sync = 1; 2109 } else if (mdev->state.conn != C_STANDALONE) { 2110 retcode = ERR_CONNECTED; 2111 goto out_dec; 2112 } 2113 2114 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */ 2115 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */ 2116 2117 if (args.clear_bm) { 2118 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid"); 2119 if (err) { 2120 dev_err(DEV, "Writing bitmap failed with %d\n",err); 2121 retcode = ERR_IO_MD_DISK; 2122 } 2123 if (skip_initial_sync) { 2124 drbd_send_uuids_skip_initial_sync(mdev); 2125 _drbd_uuid_set(mdev, UI_BITMAP, 0); 2126 spin_lock_irq(&mdev->req_lock); 2127 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 2128 CS_VERBOSE, NULL); 2129 spin_unlock_irq(&mdev->req_lock); 2130 } 2131 } 2132 2133 drbd_md_sync(mdev); 2134 out_dec: 2135 put_ldev(mdev); 2136 out: 2137 mutex_unlock(&mdev->state_mutex); 2138 2139 reply->ret_code = retcode; 2140 return 0; 2141 } 2142 2143 struct cn_handler_struct { 2144 int (*function)(struct drbd_conf *, 2145 struct drbd_nl_cfg_req *, 2146 struct drbd_nl_cfg_reply *); 2147 int reply_body_size; 2148 }; 2149 2150 static struct cn_handler_struct cnd_table[] = { 2151 [ P_primary ] = { &drbd_nl_primary, 0 }, 2152 [ P_secondary ] = { &drbd_nl_secondary, 0 }, 2153 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 }, 2154 [ P_detach ] = { &drbd_nl_detach, 0 }, 2155 [ P_net_conf ] = { &drbd_nl_net_conf, 0 }, 2156 [ P_disconnect ] = { &drbd_nl_disconnect, 0 }, 2157 [ P_resize ] = { &drbd_nl_resize, 0 }, 2158 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 }, 2159 [ P_invalidate ] = { &drbd_nl_invalidate, 0 }, 2160 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 }, 2161 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 }, 2162 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 }, 2163 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 }, 2164 [ P_resume_io ] = { &drbd_nl_resume_io, 0 }, 2165 [ P_outdate ] = { &drbd_nl_outdate, 0 }, 2166 [ P_get_config ] = { &drbd_nl_get_config, 2167 sizeof(struct syncer_conf_tag_len_struct) + 2168 sizeof(struct disk_conf_tag_len_struct) + 2169 sizeof(struct net_conf_tag_len_struct) }, 2170 [ P_get_state ] = { &drbd_nl_get_state, 2171 sizeof(struct get_state_tag_len_struct) + 2172 sizeof(struct sync_progress_tag_len_struct) }, 2173 [ P_get_uuids ] = { &drbd_nl_get_uuids, 2174 sizeof(struct get_uuids_tag_len_struct) }, 2175 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag, 2176 sizeof(struct get_timeout_flag_tag_len_struct)}, 2177 [ P_start_ov ] = { &drbd_nl_start_ov, 0 }, 2178 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 }, 2179 }; 2180 2181 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp) 2182 { 2183 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data; 2184 struct cn_handler_struct *cm; 2185 struct cn_msg *cn_reply; 2186 struct drbd_nl_cfg_reply *reply; 2187 struct drbd_conf *mdev; 2188 int retcode, rr; 2189 int reply_size = sizeof(struct cn_msg) 2190 + sizeof(struct drbd_nl_cfg_reply) 2191 + sizeof(short int); 2192 2193 if (!try_module_get(THIS_MODULE)) { 2194 printk(KERN_ERR "drbd: try_module_get() failed!\n"); 2195 return; 2196 } 2197 2198 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) { 2199 retcode = ERR_PERM; 2200 goto fail; 2201 } 2202 2203 mdev = ensure_mdev(nlp->drbd_minor, 2204 (nlp->flags & DRBD_NL_CREATE_DEVICE)); 2205 if (!mdev) { 2206 retcode = ERR_MINOR_INVALID; 2207 goto fail; 2208 } 2209 2210 if (nlp->packet_type >= P_nl_after_last_packet) { 2211 retcode = ERR_PACKET_NR; 2212 goto fail; 2213 } 2214 2215 cm = cnd_table + nlp->packet_type; 2216 2217 /* This may happen if packet number is 0: */ 2218 if (cm->function == NULL) { 2219 retcode = ERR_PACKET_NR; 2220 goto fail; 2221 } 2222 2223 reply_size += cm->reply_body_size; 2224 2225 /* allocation not in the IO path, cqueue thread context */ 2226 cn_reply = kmalloc(reply_size, GFP_KERNEL); 2227 if (!cn_reply) { 2228 retcode = ERR_NOMEM; 2229 goto fail; 2230 } 2231 reply = (struct drbd_nl_cfg_reply *) cn_reply->data; 2232 2233 reply->packet_type = 2234 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet; 2235 reply->minor = nlp->drbd_minor; 2236 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */ 2237 /* reply->tag_list; might be modified by cm->function. */ 2238 2239 rr = cm->function(mdev, nlp, reply); 2240 2241 cn_reply->id = req->id; 2242 cn_reply->seq = req->seq; 2243 cn_reply->ack = req->ack + 1; 2244 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr; 2245 cn_reply->flags = 0; 2246 2247 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL); 2248 if (rr && rr != -ESRCH) 2249 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2250 2251 kfree(cn_reply); 2252 module_put(THIS_MODULE); 2253 return; 2254 fail: 2255 drbd_nl_send_reply(req, retcode); 2256 module_put(THIS_MODULE); 2257 } 2258 2259 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */ 2260 2261 static unsigned short * 2262 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, 2263 unsigned short len, int nul_terminated) 2264 { 2265 unsigned short l = tag_descriptions[tag_number(tag)].max_len; 2266 len = (len < l) ? len : l; 2267 put_unaligned(tag, tl++); 2268 put_unaligned(len, tl++); 2269 memcpy(tl, data, len); 2270 tl = (unsigned short*)((char*)tl + len); 2271 if (nul_terminated) 2272 *((char*)tl - 1) = 0; 2273 return tl; 2274 } 2275 2276 static unsigned short * 2277 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len) 2278 { 2279 return __tl_add_blob(tl, tag, data, len, 0); 2280 } 2281 2282 static unsigned short * 2283 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str) 2284 { 2285 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0); 2286 } 2287 2288 static unsigned short * 2289 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val) 2290 { 2291 put_unaligned(tag, tl++); 2292 switch(tag_type(tag)) { 2293 case TT_INTEGER: 2294 put_unaligned(sizeof(int), tl++); 2295 put_unaligned(*(int *)val, (int *)tl); 2296 tl = (unsigned short*)((char*)tl+sizeof(int)); 2297 break; 2298 case TT_INT64: 2299 put_unaligned(sizeof(u64), tl++); 2300 put_unaligned(*(u64 *)val, (u64 *)tl); 2301 tl = (unsigned short*)((char*)tl+sizeof(u64)); 2302 break; 2303 default: 2304 /* someone did something stupid. */ 2305 ; 2306 } 2307 return tl; 2308 } 2309 2310 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state) 2311 { 2312 char buffer[sizeof(struct cn_msg)+ 2313 sizeof(struct drbd_nl_cfg_reply)+ 2314 sizeof(struct get_state_tag_len_struct)+ 2315 sizeof(short int)]; 2316 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2317 struct drbd_nl_cfg_reply *reply = 2318 (struct drbd_nl_cfg_reply *)cn_reply->data; 2319 unsigned short *tl = reply->tag_list; 2320 2321 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2322 2323 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl); 2324 2325 put_unaligned(TT_END, tl++); /* Close the tag list */ 2326 2327 cn_reply->id.idx = CN_IDX_DRBD; 2328 cn_reply->id.val = CN_VAL_DRBD; 2329 2330 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2331 cn_reply->ack = 0; /* not used here. */ 2332 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2333 (int)((char *)tl - (char *)reply->tag_list); 2334 cn_reply->flags = 0; 2335 2336 reply->packet_type = P_get_state; 2337 reply->minor = mdev_to_minor(mdev); 2338 reply->ret_code = NO_ERROR; 2339 2340 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2341 } 2342 2343 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name) 2344 { 2345 char buffer[sizeof(struct cn_msg)+ 2346 sizeof(struct drbd_nl_cfg_reply)+ 2347 sizeof(struct call_helper_tag_len_struct)+ 2348 sizeof(short int)]; 2349 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2350 struct drbd_nl_cfg_reply *reply = 2351 (struct drbd_nl_cfg_reply *)cn_reply->data; 2352 unsigned short *tl = reply->tag_list; 2353 2354 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2355 2356 tl = tl_add_str(tl, T_helper, helper_name); 2357 put_unaligned(TT_END, tl++); /* Close the tag list */ 2358 2359 cn_reply->id.idx = CN_IDX_DRBD; 2360 cn_reply->id.val = CN_VAL_DRBD; 2361 2362 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2363 cn_reply->ack = 0; /* not used here. */ 2364 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2365 (int)((char *)tl - (char *)reply->tag_list); 2366 cn_reply->flags = 0; 2367 2368 reply->packet_type = P_call_helper; 2369 reply->minor = mdev_to_minor(mdev); 2370 reply->ret_code = NO_ERROR; 2371 2372 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2373 } 2374 2375 void drbd_bcast_ee(struct drbd_conf *mdev, 2376 const char *reason, const int dgs, 2377 const char* seen_hash, const char* calc_hash, 2378 const struct drbd_epoch_entry* e) 2379 { 2380 struct cn_msg *cn_reply; 2381 struct drbd_nl_cfg_reply *reply; 2382 unsigned short *tl; 2383 struct page *page; 2384 unsigned len; 2385 2386 if (!e) 2387 return; 2388 if (!reason || !reason[0]) 2389 return; 2390 2391 /* apparently we have to memcpy twice, first to prepare the data for the 2392 * struct cn_msg, then within cn_netlink_send from the cn_msg to the 2393 * netlink skb. */ 2394 /* receiver thread context, which is not in the writeout path (of this node), 2395 * but may be in the writeout path of the _other_ node. 2396 * GFP_NOIO to avoid potential "distributed deadlock". */ 2397 cn_reply = kmalloc( 2398 sizeof(struct cn_msg)+ 2399 sizeof(struct drbd_nl_cfg_reply)+ 2400 sizeof(struct dump_ee_tag_len_struct)+ 2401 sizeof(short int), 2402 GFP_NOIO); 2403 2404 if (!cn_reply) { 2405 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n", 2406 (unsigned long long)e->sector, e->size); 2407 return; 2408 } 2409 2410 reply = (struct drbd_nl_cfg_reply*)cn_reply->data; 2411 tl = reply->tag_list; 2412 2413 tl = tl_add_str(tl, T_dump_ee_reason, reason); 2414 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs); 2415 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs); 2416 tl = tl_add_int(tl, T_ee_sector, &e->sector); 2417 tl = tl_add_int(tl, T_ee_block_id, &e->block_id); 2418 2419 put_unaligned(T_ee_data, tl++); 2420 put_unaligned(e->size, tl++); 2421 2422 len = e->size; 2423 page = e->pages; 2424 page_chain_for_each(page) { 2425 void *d = kmap_atomic(page, KM_USER0); 2426 unsigned l = min_t(unsigned, len, PAGE_SIZE); 2427 memcpy(tl, d, l); 2428 kunmap_atomic(d, KM_USER0); 2429 tl = (unsigned short*)((char*)tl + l); 2430 len -= l; 2431 } 2432 put_unaligned(TT_END, tl++); /* Close the tag list */ 2433 2434 cn_reply->id.idx = CN_IDX_DRBD; 2435 cn_reply->id.val = CN_VAL_DRBD; 2436 2437 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq); 2438 cn_reply->ack = 0; // not used here. 2439 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2440 (int)((char*)tl - (char*)reply->tag_list); 2441 cn_reply->flags = 0; 2442 2443 reply->packet_type = P_dump_ee; 2444 reply->minor = mdev_to_minor(mdev); 2445 reply->ret_code = NO_ERROR; 2446 2447 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2448 kfree(cn_reply); 2449 } 2450 2451 void drbd_bcast_sync_progress(struct drbd_conf *mdev) 2452 { 2453 char buffer[sizeof(struct cn_msg)+ 2454 sizeof(struct drbd_nl_cfg_reply)+ 2455 sizeof(struct sync_progress_tag_len_struct)+ 2456 sizeof(short int)]; 2457 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2458 struct drbd_nl_cfg_reply *reply = 2459 (struct drbd_nl_cfg_reply *)cn_reply->data; 2460 unsigned short *tl = reply->tag_list; 2461 unsigned long rs_left; 2462 unsigned int res; 2463 2464 /* no local ref, no bitmap, no syncer progress, no broadcast. */ 2465 if (!get_ldev(mdev)) 2466 return; 2467 drbd_get_syncer_progress(mdev, &rs_left, &res); 2468 put_ldev(mdev); 2469 2470 tl = tl_add_int(tl, T_sync_progress, &res); 2471 put_unaligned(TT_END, tl++); /* Close the tag list */ 2472 2473 cn_reply->id.idx = CN_IDX_DRBD; 2474 cn_reply->id.val = CN_VAL_DRBD; 2475 2476 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2477 cn_reply->ack = 0; /* not used here. */ 2478 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2479 (int)((char *)tl - (char *)reply->tag_list); 2480 cn_reply->flags = 0; 2481 2482 reply->packet_type = P_sync_progress; 2483 reply->minor = mdev_to_minor(mdev); 2484 reply->ret_code = NO_ERROR; 2485 2486 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2487 } 2488 2489 int __init drbd_nl_init(void) 2490 { 2491 static struct cb_id cn_id_drbd; 2492 int err, try=10; 2493 2494 cn_id_drbd.val = CN_VAL_DRBD; 2495 do { 2496 cn_id_drbd.idx = cn_idx; 2497 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback); 2498 if (!err) 2499 break; 2500 cn_idx = (cn_idx + CN_IDX_STEP); 2501 } while (try--); 2502 2503 if (err) { 2504 printk(KERN_ERR "drbd: cn_drbd failed to register\n"); 2505 return err; 2506 } 2507 2508 return 0; 2509 } 2510 2511 void drbd_nl_cleanup(void) 2512 { 2513 static struct cb_id cn_id_drbd; 2514 2515 cn_id_drbd.idx = cn_idx; 2516 cn_id_drbd.val = CN_VAL_DRBD; 2517 2518 cn_del_callback(&cn_id_drbd); 2519 } 2520 2521 void drbd_nl_send_reply(struct cn_msg *req, int ret_code) 2522 { 2523 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)]; 2524 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2525 struct drbd_nl_cfg_reply *reply = 2526 (struct drbd_nl_cfg_reply *)cn_reply->data; 2527 int rr; 2528 2529 cn_reply->id = req->id; 2530 2531 cn_reply->seq = req->seq; 2532 cn_reply->ack = req->ack + 1; 2533 cn_reply->len = sizeof(struct drbd_nl_cfg_reply); 2534 cn_reply->flags = 0; 2535 2536 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor; 2537 reply->ret_code = ret_code; 2538 2539 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2540 if (rr && rr != -ESRCH) 2541 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2542 } 2543 2544