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