drbd_nl.c revision 1816a2b47afae838e53a177d5d166cc7be97d6b5
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 44static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int); 45static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *); 46static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *); 47 48/* see get_sb_bdev and bd_claim */ 49static 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) \ 53static int name ## _from_tags(struct drbd_conf *mdev, \ 54 unsigned short *tags, struct name *arg) __attribute__ ((unused)); \ 55static 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) \ 101static unsigned short* \ 102name ## _to_tags(struct drbd_conf *mdev, \ 103 struct name *arg, unsigned short *tags) __attribute__ ((unused)); \ 104static unsigned short* \ 105name ## _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 134void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name); 135void drbd_nl_send_reply(struct cn_msg *, int); 136 137int 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 198enum 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 261out: 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 271static 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 282void 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 291int 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 429static 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 463static 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 480static 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 */ 490static 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 531char *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 */ 559void 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 567void 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 */ 580enum 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; 657out: 658 lc_unlock(mdev->act_log); 659 wake_up(&mdev->al_wait); 660 drbd_resume_io(mdev); 661 662 return rv; 663} 664 665sector_t 666drbd_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 */ 720static 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 768void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size) __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 int max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9); 774 775 blk_queue_logical_block_size(q, 512); 776 blk_queue_max_hw_sectors(q, max_hw_sectors); 777 /* This is the workaround for "bio would need to, but cannot, be split" */ 778 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS); 779 blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1); 780 blk_queue_stack_limits(q, b); 781 782 dev_info(DEV, "max BIO size = %u\n", queue_max_hw_sectors(q) << 9); 783 784 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) { 785 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n", 786 q->backing_dev_info.ra_pages, 787 b->backing_dev_info.ra_pages); 788 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages; 789 } 790} 791 792/* serialize deconfig (worker exiting, doing cleanup) 793 * and reconfig (drbdsetup disk, drbdsetup net) 794 * 795 * Wait for a potentially exiting worker, then restart it, 796 * or start a new one. Flush any pending work, there may still be an 797 * after_state_change queued. 798 */ 799static void drbd_reconfig_start(struct drbd_conf *mdev) 800{ 801 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags)); 802 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags)); 803 drbd_thread_start(&mdev->worker); 804 drbd_flush_workqueue(mdev); 805} 806 807/* if still unconfigured, stops worker again. 808 * if configured now, clears CONFIG_PENDING. 809 * wakes potential waiters */ 810static void drbd_reconfig_done(struct drbd_conf *mdev) 811{ 812 spin_lock_irq(&mdev->req_lock); 813 if (mdev->state.disk == D_DISKLESS && 814 mdev->state.conn == C_STANDALONE && 815 mdev->state.role == R_SECONDARY) { 816 set_bit(DEVICE_DYING, &mdev->flags); 817 drbd_thread_stop_nowait(&mdev->worker); 818 } else 819 clear_bit(CONFIG_PENDING, &mdev->flags); 820 spin_unlock_irq(&mdev->req_lock); 821 wake_up(&mdev->state_wait); 822} 823 824/* Make sure IO is suspended before calling this function(). */ 825static void drbd_suspend_al(struct drbd_conf *mdev) 826{ 827 int s = 0; 828 829 if (lc_try_lock(mdev->act_log)) { 830 drbd_al_shrink(mdev); 831 lc_unlock(mdev->act_log); 832 } else { 833 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n"); 834 return; 835 } 836 837 spin_lock_irq(&mdev->req_lock); 838 if (mdev->state.conn < C_CONNECTED) 839 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags); 840 841 spin_unlock_irq(&mdev->req_lock); 842 843 if (s) 844 dev_info(DEV, "Suspended AL updates\n"); 845} 846 847/* does always return 0; 848 * interesting return code is in reply->ret_code */ 849static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 850 struct drbd_nl_cfg_reply *reply) 851{ 852 enum drbd_ret_codes retcode; 853 enum determine_dev_size dd; 854 sector_t max_possible_sectors; 855 sector_t min_md_device_sectors; 856 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */ 857 struct block_device *bdev; 858 struct lru_cache *resync_lru = NULL; 859 union drbd_state ns, os; 860 unsigned int max_bio_size; 861 int rv; 862 int cp_discovered = 0; 863 int logical_block_size; 864 865 drbd_reconfig_start(mdev); 866 867 /* if you want to reconfigure, please tear down first */ 868 if (mdev->state.disk > D_DISKLESS) { 869 retcode = ERR_DISK_CONFIGURED; 870 goto fail; 871 } 872 /* It may just now have detached because of IO error. Make sure 873 * drbd_ldev_destroy is done already, we may end up here very fast, 874 * e.g. if someone calls attach from the on-io-error handler, 875 * to realize a "hot spare" feature (not that I'd recommend that) */ 876 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt)); 877 878 /* allocation not in the IO path, cqueue thread context */ 879 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL); 880 if (!nbc) { 881 retcode = ERR_NOMEM; 882 goto fail; 883 } 884 885 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF; 886 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF; 887 nbc->dc.fencing = DRBD_FENCING_DEF; 888 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF; 889 890 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) { 891 retcode = ERR_MANDATORY_TAG; 892 goto fail; 893 } 894 895 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) { 896 retcode = ERR_MD_IDX_INVALID; 897 goto fail; 898 } 899 900 if (get_net_conf(mdev)) { 901 int prot = mdev->net_conf->wire_protocol; 902 put_net_conf(mdev); 903 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) { 904 retcode = ERR_STONITH_AND_PROT_A; 905 goto fail; 906 } 907 } 908 909 bdev = blkdev_get_by_path(nbc->dc.backing_dev, 910 FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev); 911 if (IS_ERR(bdev)) { 912 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev, 913 PTR_ERR(bdev)); 914 retcode = ERR_OPEN_DISK; 915 goto fail; 916 } 917 nbc->backing_bdev = bdev; 918 919 /* 920 * meta_dev_idx >= 0: external fixed size, possibly multiple 921 * drbd sharing one meta device. TODO in that case, paranoia 922 * check that [md_bdev, meta_dev_idx] is not yet used by some 923 * other drbd minor! (if you use drbd.conf + drbdadm, that 924 * should check it for you already; but if you don't, or 925 * someone fooled it, we need to double check here) 926 */ 927 bdev = blkdev_get_by_path(nbc->dc.meta_dev, 928 FMODE_READ | FMODE_WRITE | FMODE_EXCL, 929 (nbc->dc.meta_dev_idx < 0) ? 930 (void *)mdev : (void *)drbd_m_holder); 931 if (IS_ERR(bdev)) { 932 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev, 933 PTR_ERR(bdev)); 934 retcode = ERR_OPEN_MD_DISK; 935 goto fail; 936 } 937 nbc->md_bdev = bdev; 938 939 if ((nbc->backing_bdev == nbc->md_bdev) != 940 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL || 941 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) { 942 retcode = ERR_MD_IDX_INVALID; 943 goto fail; 944 } 945 946 resync_lru = lc_create("resync", drbd_bm_ext_cache, 947 61, sizeof(struct bm_extent), 948 offsetof(struct bm_extent, lce)); 949 if (!resync_lru) { 950 retcode = ERR_NOMEM; 951 goto fail; 952 } 953 954 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */ 955 drbd_md_set_sector_offsets(mdev, nbc); 956 957 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) { 958 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n", 959 (unsigned long long) drbd_get_max_capacity(nbc), 960 (unsigned long long) nbc->dc.disk_size); 961 retcode = ERR_DISK_TO_SMALL; 962 goto fail; 963 } 964 965 if (nbc->dc.meta_dev_idx < 0) { 966 max_possible_sectors = DRBD_MAX_SECTORS_FLEX; 967 /* at least one MB, otherwise it does not make sense */ 968 min_md_device_sectors = (2<<10); 969 } else { 970 max_possible_sectors = DRBD_MAX_SECTORS; 971 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1); 972 } 973 974 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) { 975 retcode = ERR_MD_DISK_TO_SMALL; 976 dev_warn(DEV, "refusing attach: md-device too small, " 977 "at least %llu sectors needed for this meta-disk type\n", 978 (unsigned long long) min_md_device_sectors); 979 goto fail; 980 } 981 982 /* Make sure the new disk is big enough 983 * (we may currently be R_PRIMARY with no local disk...) */ 984 if (drbd_get_max_capacity(nbc) < 985 drbd_get_capacity(mdev->this_bdev)) { 986 retcode = ERR_DISK_TO_SMALL; 987 goto fail; 988 } 989 990 nbc->known_size = drbd_get_capacity(nbc->backing_bdev); 991 992 if (nbc->known_size > max_possible_sectors) { 993 dev_warn(DEV, "==> truncating very big lower level device " 994 "to currently maximum possible %llu sectors <==\n", 995 (unsigned long long) max_possible_sectors); 996 if (nbc->dc.meta_dev_idx >= 0) 997 dev_warn(DEV, "==>> using internal or flexible " 998 "meta data may help <<==\n"); 999 } 1000 1001 drbd_suspend_io(mdev); 1002 /* also wait for the last barrier ack. */ 1003 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state)); 1004 /* and for any other previously queued work */ 1005 drbd_flush_workqueue(mdev); 1006 1007 retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE); 1008 drbd_resume_io(mdev); 1009 if (retcode < SS_SUCCESS) 1010 goto fail; 1011 1012 if (!get_ldev_if_state(mdev, D_ATTACHING)) 1013 goto force_diskless; 1014 1015 drbd_md_set_sector_offsets(mdev, nbc); 1016 1017 /* allocate a second IO page if logical_block_size != 512 */ 1018 logical_block_size = bdev_logical_block_size(nbc->md_bdev); 1019 if (logical_block_size == 0) 1020 logical_block_size = MD_SECTOR_SIZE; 1021 1022 if (logical_block_size != MD_SECTOR_SIZE) { 1023 if (!mdev->md_io_tmpp) { 1024 struct page *page = alloc_page(GFP_NOIO); 1025 if (!page) 1026 goto force_diskless_dec; 1027 1028 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n", 1029 logical_block_size, MD_SECTOR_SIZE); 1030 dev_warn(DEV, "Workaround engaged (has performance impact).\n"); 1031 1032 mdev->md_io_tmpp = page; 1033 } 1034 } 1035 1036 if (!mdev->bitmap) { 1037 if (drbd_bm_init(mdev)) { 1038 retcode = ERR_NOMEM; 1039 goto force_diskless_dec; 1040 } 1041 } 1042 1043 retcode = drbd_md_read(mdev, nbc); 1044 if (retcode != NO_ERROR) 1045 goto force_diskless_dec; 1046 1047 if (mdev->state.conn < C_CONNECTED && 1048 mdev->state.role == R_PRIMARY && 1049 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) { 1050 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n", 1051 (unsigned long long)mdev->ed_uuid); 1052 retcode = ERR_DATA_NOT_CURRENT; 1053 goto force_diskless_dec; 1054 } 1055 1056 /* Since we are diskless, fix the activity log first... */ 1057 if (drbd_check_al_size(mdev)) { 1058 retcode = ERR_NOMEM; 1059 goto force_diskless_dec; 1060 } 1061 1062 /* Prevent shrinking of consistent devices ! */ 1063 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) && 1064 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) { 1065 dev_warn(DEV, "refusing to truncate a consistent device\n"); 1066 retcode = ERR_DISK_TO_SMALL; 1067 goto force_diskless_dec; 1068 } 1069 1070 if (!drbd_al_read_log(mdev, nbc)) { 1071 retcode = ERR_IO_MD_DISK; 1072 goto force_diskless_dec; 1073 } 1074 1075 /* Reset the "barriers don't work" bits here, then force meta data to 1076 * be written, to ensure we determine if barriers are supported. */ 1077 if (nbc->dc.no_md_flush) 1078 set_bit(MD_NO_FUA, &mdev->flags); 1079 else 1080 clear_bit(MD_NO_FUA, &mdev->flags); 1081 1082 /* Point of no return reached. 1083 * Devices and memory are no longer released by error cleanup below. 1084 * now mdev takes over responsibility, and the state engine should 1085 * clean it up somewhere. */ 1086 D_ASSERT(mdev->ldev == NULL); 1087 mdev->ldev = nbc; 1088 mdev->resync = resync_lru; 1089 nbc = NULL; 1090 resync_lru = NULL; 1091 1092 mdev->write_ordering = WO_bdev_flush; 1093 drbd_bump_write_ordering(mdev, WO_bdev_flush); 1094 1095 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY)) 1096 set_bit(CRASHED_PRIMARY, &mdev->flags); 1097 else 1098 clear_bit(CRASHED_PRIMARY, &mdev->flags); 1099 1100 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && 1101 !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) { 1102 set_bit(CRASHED_PRIMARY, &mdev->flags); 1103 cp_discovered = 1; 1104 } 1105 1106 mdev->send_cnt = 0; 1107 mdev->recv_cnt = 0; 1108 mdev->read_cnt = 0; 1109 mdev->writ_cnt = 0; 1110 1111 max_bio_size = DRBD_MAX_BIO_SIZE; 1112 if (mdev->state.conn == C_CONNECTED) { 1113 /* We are Primary, Connected, and now attach a new local 1114 * backing store. We must not increase the user visible maximum 1115 * bio size on this device to something the peer may not be 1116 * able to handle. */ 1117 if (mdev->agreed_pro_version < 94) 1118 max_bio_size = queue_max_hw_sectors(mdev->rq_queue) << 9; 1119 else if (mdev->agreed_pro_version == 94) 1120 max_bio_size = DRBD_MAX_SIZE_H80_PACKET; 1121 /* else: drbd 8.3.9 and later, stay with default */ 1122 } 1123 1124 drbd_setup_queue_param(mdev, max_bio_size); 1125 1126 /* If I am currently not R_PRIMARY, 1127 * but meta data primary indicator is set, 1128 * I just now recover from a hard crash, 1129 * and have been R_PRIMARY before that crash. 1130 * 1131 * Now, if I had no connection before that crash 1132 * (have been degraded R_PRIMARY), chances are that 1133 * I won't find my peer now either. 1134 * 1135 * In that case, and _only_ in that case, 1136 * we use the degr-wfc-timeout instead of the default, 1137 * so we can automatically recover from a crash of a 1138 * degraded but active "cluster" after a certain timeout. 1139 */ 1140 clear_bit(USE_DEGR_WFC_T, &mdev->flags); 1141 if (mdev->state.role != R_PRIMARY && 1142 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && 1143 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND)) 1144 set_bit(USE_DEGR_WFC_T, &mdev->flags); 1145 1146 dd = drbd_determin_dev_size(mdev, 0); 1147 if (dd == dev_size_error) { 1148 retcode = ERR_NOMEM_BITMAP; 1149 goto force_diskless_dec; 1150 } else if (dd == grew) 1151 set_bit(RESYNC_AFTER_NEG, &mdev->flags); 1152 1153 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { 1154 dev_info(DEV, "Assuming that all blocks are out of sync " 1155 "(aka FullSync)\n"); 1156 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) { 1157 retcode = ERR_IO_MD_DISK; 1158 goto force_diskless_dec; 1159 } 1160 } else { 1161 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) { 1162 retcode = ERR_IO_MD_DISK; 1163 goto force_diskless_dec; 1164 } 1165 } 1166 1167 if (cp_discovered) { 1168 drbd_al_apply_to_bm(mdev); 1169 drbd_al_to_on_disk_bm(mdev); 1170 } 1171 1172 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev)) 1173 drbd_suspend_al(mdev); /* IO is still suspended here... */ 1174 1175 spin_lock_irq(&mdev->req_lock); 1176 os = mdev->state; 1177 ns.i = os.i; 1178 /* If MDF_CONSISTENT is not set go into inconsistent state, 1179 otherwise investigate MDF_WasUpToDate... 1180 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state, 1181 otherwise into D_CONSISTENT state. 1182 */ 1183 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) { 1184 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE)) 1185 ns.disk = D_CONSISTENT; 1186 else 1187 ns.disk = D_OUTDATED; 1188 } else { 1189 ns.disk = D_INCONSISTENT; 1190 } 1191 1192 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED)) 1193 ns.pdsk = D_OUTDATED; 1194 1195 if ( ns.disk == D_CONSISTENT && 1196 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE)) 1197 ns.disk = D_UP_TO_DATE; 1198 1199 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND, 1200 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before 1201 this point, because drbd_request_state() modifies these 1202 flags. */ 1203 1204 /* In case we are C_CONNECTED postpone any decision on the new disk 1205 state after the negotiation phase. */ 1206 if (mdev->state.conn == C_CONNECTED) { 1207 mdev->new_state_tmp.i = ns.i; 1208 ns.i = os.i; 1209 ns.disk = D_NEGOTIATING; 1210 1211 /* We expect to receive up-to-date UUIDs soon. 1212 To avoid a race in receive_state, free p_uuid while 1213 holding req_lock. I.e. atomic with the state change */ 1214 kfree(mdev->p_uuid); 1215 mdev->p_uuid = NULL; 1216 } 1217 1218 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 1219 ns = mdev->state; 1220 spin_unlock_irq(&mdev->req_lock); 1221 1222 if (rv < SS_SUCCESS) 1223 goto force_diskless_dec; 1224 1225 if (mdev->state.role == R_PRIMARY) 1226 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1; 1227 else 1228 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; 1229 1230 drbd_md_mark_dirty(mdev); 1231 drbd_md_sync(mdev); 1232 1233 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1234 put_ldev(mdev); 1235 reply->ret_code = retcode; 1236 drbd_reconfig_done(mdev); 1237 return 0; 1238 1239 force_diskless_dec: 1240 put_ldev(mdev); 1241 force_diskless: 1242 drbd_force_state(mdev, NS(disk, D_FAILED)); 1243 drbd_md_sync(mdev); 1244 fail: 1245 if (nbc) { 1246 if (nbc->backing_bdev) 1247 blkdev_put(nbc->backing_bdev, 1248 FMODE_READ | FMODE_WRITE | FMODE_EXCL); 1249 if (nbc->md_bdev) 1250 blkdev_put(nbc->md_bdev, 1251 FMODE_READ | FMODE_WRITE | FMODE_EXCL); 1252 kfree(nbc); 1253 } 1254 lc_destroy(resync_lru); 1255 1256 reply->ret_code = retcode; 1257 drbd_reconfig_done(mdev); 1258 return 0; 1259} 1260 1261/* Detaching the disk is a process in multiple stages. First we need to lock 1262 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io. 1263 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all 1264 * internal references as well. 1265 * Only then we have finally detached. */ 1266static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1267 struct drbd_nl_cfg_reply *reply) 1268{ 1269 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */ 1270 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS)); 1271 if (mdev->state.disk == D_DISKLESS) 1272 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt)); 1273 drbd_resume_io(mdev); 1274 return 0; 1275} 1276 1277static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1278 struct drbd_nl_cfg_reply *reply) 1279{ 1280 int i, ns; 1281 enum drbd_ret_codes retcode; 1282 struct net_conf *new_conf = NULL; 1283 struct crypto_hash *tfm = NULL; 1284 struct crypto_hash *integrity_w_tfm = NULL; 1285 struct crypto_hash *integrity_r_tfm = NULL; 1286 struct hlist_head *new_tl_hash = NULL; 1287 struct hlist_head *new_ee_hash = NULL; 1288 struct drbd_conf *odev; 1289 char hmac_name[CRYPTO_MAX_ALG_NAME]; 1290 void *int_dig_out = NULL; 1291 void *int_dig_in = NULL; 1292 void *int_dig_vv = NULL; 1293 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr; 1294 1295 drbd_reconfig_start(mdev); 1296 1297 if (mdev->state.conn > C_STANDALONE) { 1298 retcode = ERR_NET_CONFIGURED; 1299 goto fail; 1300 } 1301 1302 /* allocation not in the IO path, cqueue thread context */ 1303 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 1304 if (!new_conf) { 1305 retcode = ERR_NOMEM; 1306 goto fail; 1307 } 1308 1309 new_conf->timeout = DRBD_TIMEOUT_DEF; 1310 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF; 1311 new_conf->ping_int = DRBD_PING_INT_DEF; 1312 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF; 1313 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF; 1314 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF; 1315 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF; 1316 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF; 1317 new_conf->ko_count = DRBD_KO_COUNT_DEF; 1318 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF; 1319 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF; 1320 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF; 1321 new_conf->want_lose = 0; 1322 new_conf->two_primaries = 0; 1323 new_conf->wire_protocol = DRBD_PROT_C; 1324 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF; 1325 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF; 1326 1327 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) { 1328 retcode = ERR_MANDATORY_TAG; 1329 goto fail; 1330 } 1331 1332 if (new_conf->two_primaries 1333 && (new_conf->wire_protocol != DRBD_PROT_C)) { 1334 retcode = ERR_NOT_PROTO_C; 1335 goto fail; 1336 } 1337 1338 if (get_ldev(mdev)) { 1339 enum drbd_fencing_p fp = mdev->ldev->dc.fencing; 1340 put_ldev(mdev); 1341 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) { 1342 retcode = ERR_STONITH_AND_PROT_A; 1343 goto fail; 1344 } 1345 } 1346 1347 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) { 1348 retcode = ERR_DISCARD; 1349 goto fail; 1350 } 1351 1352 retcode = NO_ERROR; 1353 1354 new_my_addr = (struct sockaddr *)&new_conf->my_addr; 1355 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr; 1356 for (i = 0; i < minor_count; i++) { 1357 odev = minor_to_mdev(i); 1358 if (!odev || odev == mdev) 1359 continue; 1360 if (get_net_conf(odev)) { 1361 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr; 1362 if (new_conf->my_addr_len == odev->net_conf->my_addr_len && 1363 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len)) 1364 retcode = ERR_LOCAL_ADDR; 1365 1366 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr; 1367 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len && 1368 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len)) 1369 retcode = ERR_PEER_ADDR; 1370 1371 put_net_conf(odev); 1372 if (retcode != NO_ERROR) 1373 goto fail; 1374 } 1375 } 1376 1377 if (new_conf->cram_hmac_alg[0] != 0) { 1378 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", 1379 new_conf->cram_hmac_alg); 1380 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC); 1381 if (IS_ERR(tfm)) { 1382 tfm = NULL; 1383 retcode = ERR_AUTH_ALG; 1384 goto fail; 1385 } 1386 1387 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 1388 retcode = ERR_AUTH_ALG_ND; 1389 goto fail; 1390 } 1391 } 1392 1393 if (new_conf->integrity_alg[0]) { 1394 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1395 if (IS_ERR(integrity_w_tfm)) { 1396 integrity_w_tfm = NULL; 1397 retcode=ERR_INTEGRITY_ALG; 1398 goto fail; 1399 } 1400 1401 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) { 1402 retcode=ERR_INTEGRITY_ALG_ND; 1403 goto fail; 1404 } 1405 1406 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1407 if (IS_ERR(integrity_r_tfm)) { 1408 integrity_r_tfm = NULL; 1409 retcode=ERR_INTEGRITY_ALG; 1410 goto fail; 1411 } 1412 } 1413 1414 ns = new_conf->max_epoch_size/8; 1415 if (mdev->tl_hash_s != ns) { 1416 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1417 if (!new_tl_hash) { 1418 retcode = ERR_NOMEM; 1419 goto fail; 1420 } 1421 } 1422 1423 ns = new_conf->max_buffers/8; 1424 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) { 1425 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1426 if (!new_ee_hash) { 1427 retcode = ERR_NOMEM; 1428 goto fail; 1429 } 1430 } 1431 1432 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0; 1433 1434 if (integrity_w_tfm) { 1435 i = crypto_hash_digestsize(integrity_w_tfm); 1436 int_dig_out = kmalloc(i, GFP_KERNEL); 1437 if (!int_dig_out) { 1438 retcode = ERR_NOMEM; 1439 goto fail; 1440 } 1441 int_dig_in = kmalloc(i, GFP_KERNEL); 1442 if (!int_dig_in) { 1443 retcode = ERR_NOMEM; 1444 goto fail; 1445 } 1446 int_dig_vv = kmalloc(i, GFP_KERNEL); 1447 if (!int_dig_vv) { 1448 retcode = ERR_NOMEM; 1449 goto fail; 1450 } 1451 } 1452 1453 if (!mdev->bitmap) { 1454 if(drbd_bm_init(mdev)) { 1455 retcode = ERR_NOMEM; 1456 goto fail; 1457 } 1458 } 1459 1460 drbd_flush_workqueue(mdev); 1461 spin_lock_irq(&mdev->req_lock); 1462 if (mdev->net_conf != NULL) { 1463 retcode = ERR_NET_CONFIGURED; 1464 spin_unlock_irq(&mdev->req_lock); 1465 goto fail; 1466 } 1467 mdev->net_conf = new_conf; 1468 1469 mdev->send_cnt = 0; 1470 mdev->recv_cnt = 0; 1471 1472 if (new_tl_hash) { 1473 kfree(mdev->tl_hash); 1474 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8; 1475 mdev->tl_hash = new_tl_hash; 1476 } 1477 1478 if (new_ee_hash) { 1479 kfree(mdev->ee_hash); 1480 mdev->ee_hash_s = mdev->net_conf->max_buffers/8; 1481 mdev->ee_hash = new_ee_hash; 1482 } 1483 1484 crypto_free_hash(mdev->cram_hmac_tfm); 1485 mdev->cram_hmac_tfm = tfm; 1486 1487 crypto_free_hash(mdev->integrity_w_tfm); 1488 mdev->integrity_w_tfm = integrity_w_tfm; 1489 1490 crypto_free_hash(mdev->integrity_r_tfm); 1491 mdev->integrity_r_tfm = integrity_r_tfm; 1492 1493 kfree(mdev->int_dig_out); 1494 kfree(mdev->int_dig_in); 1495 kfree(mdev->int_dig_vv); 1496 mdev->int_dig_out=int_dig_out; 1497 mdev->int_dig_in=int_dig_in; 1498 mdev->int_dig_vv=int_dig_vv; 1499 retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL); 1500 spin_unlock_irq(&mdev->req_lock); 1501 1502 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1503 reply->ret_code = retcode; 1504 drbd_reconfig_done(mdev); 1505 return 0; 1506 1507fail: 1508 kfree(int_dig_out); 1509 kfree(int_dig_in); 1510 kfree(int_dig_vv); 1511 crypto_free_hash(tfm); 1512 crypto_free_hash(integrity_w_tfm); 1513 crypto_free_hash(integrity_r_tfm); 1514 kfree(new_tl_hash); 1515 kfree(new_ee_hash); 1516 kfree(new_conf); 1517 1518 reply->ret_code = retcode; 1519 drbd_reconfig_done(mdev); 1520 return 0; 1521} 1522 1523static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1524 struct drbd_nl_cfg_reply *reply) 1525{ 1526 int retcode; 1527 1528 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED); 1529 1530 if (retcode == SS_NOTHING_TO_DO) 1531 goto done; 1532 else if (retcode == SS_ALREADY_STANDALONE) 1533 goto done; 1534 else if (retcode == SS_PRIMARY_NOP) { 1535 /* Our statche checking code wants to see the peer outdated. */ 1536 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1537 pdsk, D_OUTDATED)); 1538 } else if (retcode == SS_CW_FAILED_BY_PEER) { 1539 /* The peer probably wants to see us outdated. */ 1540 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1541 disk, D_OUTDATED), 1542 CS_ORDERED); 1543 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) { 1544 drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 1545 retcode = SS_SUCCESS; 1546 } 1547 } 1548 1549 if (retcode < SS_SUCCESS) 1550 goto fail; 1551 1552 if (wait_event_interruptible(mdev->state_wait, 1553 mdev->state.conn != C_DISCONNECTING)) { 1554 /* Do not test for mdev->state.conn == C_STANDALONE, since 1555 someone else might connect us in the mean time! */ 1556 retcode = ERR_INTR; 1557 goto fail; 1558 } 1559 1560 done: 1561 retcode = NO_ERROR; 1562 fail: 1563 drbd_md_sync(mdev); 1564 reply->ret_code = retcode; 1565 return 0; 1566} 1567 1568void resync_after_online_grow(struct drbd_conf *mdev) 1569{ 1570 int iass; /* I am sync source */ 1571 1572 dev_info(DEV, "Resync of new storage after online grow\n"); 1573 if (mdev->state.role != mdev->state.peer) 1574 iass = (mdev->state.role == R_PRIMARY); 1575 else 1576 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1577 1578 if (iass) 1579 drbd_start_resync(mdev, C_SYNC_SOURCE); 1580 else 1581 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE); 1582} 1583 1584static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1585 struct drbd_nl_cfg_reply *reply) 1586{ 1587 struct resize rs; 1588 int retcode = NO_ERROR; 1589 enum determine_dev_size dd; 1590 enum dds_flags ddsf; 1591 1592 memset(&rs, 0, sizeof(struct resize)); 1593 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) { 1594 retcode = ERR_MANDATORY_TAG; 1595 goto fail; 1596 } 1597 1598 if (mdev->state.conn > C_CONNECTED) { 1599 retcode = ERR_RESIZE_RESYNC; 1600 goto fail; 1601 } 1602 1603 if (mdev->state.role == R_SECONDARY && 1604 mdev->state.peer == R_SECONDARY) { 1605 retcode = ERR_NO_PRIMARY; 1606 goto fail; 1607 } 1608 1609 if (!get_ldev(mdev)) { 1610 retcode = ERR_NO_DISK; 1611 goto fail; 1612 } 1613 1614 if (rs.no_resync && mdev->agreed_pro_version < 93) { 1615 retcode = ERR_NEED_APV_93; 1616 goto fail; 1617 } 1618 1619 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) 1620 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 1621 1622 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size; 1623 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0); 1624 dd = drbd_determin_dev_size(mdev, ddsf); 1625 drbd_md_sync(mdev); 1626 put_ldev(mdev); 1627 if (dd == dev_size_error) { 1628 retcode = ERR_NOMEM_BITMAP; 1629 goto fail; 1630 } 1631 1632 if (mdev->state.conn == C_CONNECTED) { 1633 if (dd == grew) 1634 set_bit(RESIZE_PENDING, &mdev->flags); 1635 1636 drbd_send_uuids(mdev); 1637 drbd_send_sizes(mdev, 1, ddsf); 1638 } 1639 1640 fail: 1641 reply->ret_code = retcode; 1642 return 0; 1643} 1644 1645static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1646 struct drbd_nl_cfg_reply *reply) 1647{ 1648 int retcode = NO_ERROR; 1649 int err; 1650 int ovr; /* online verify running */ 1651 int rsr; /* re-sync running */ 1652 struct crypto_hash *verify_tfm = NULL; 1653 struct crypto_hash *csums_tfm = NULL; 1654 struct syncer_conf sc; 1655 cpumask_var_t new_cpu_mask; 1656 int *rs_plan_s = NULL; 1657 int fifo_size; 1658 1659 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) { 1660 retcode = ERR_NOMEM; 1661 goto fail; 1662 } 1663 1664 if (nlp->flags & DRBD_NL_SET_DEFAULTS) { 1665 memset(&sc, 0, sizeof(struct syncer_conf)); 1666 sc.rate = DRBD_RATE_DEF; 1667 sc.after = DRBD_AFTER_DEF; 1668 sc.al_extents = DRBD_AL_EXTENTS_DEF; 1669 sc.on_no_data = DRBD_ON_NO_DATA_DEF; 1670 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF; 1671 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF; 1672 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF; 1673 sc.c_max_rate = DRBD_C_MAX_RATE_DEF; 1674 sc.c_min_rate = DRBD_C_MIN_RATE_DEF; 1675 } else 1676 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf)); 1677 1678 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) { 1679 retcode = ERR_MANDATORY_TAG; 1680 goto fail; 1681 } 1682 1683 /* re-sync running */ 1684 rsr = ( mdev->state.conn == C_SYNC_SOURCE || 1685 mdev->state.conn == C_SYNC_TARGET || 1686 mdev->state.conn == C_PAUSED_SYNC_S || 1687 mdev->state.conn == C_PAUSED_SYNC_T ); 1688 1689 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) { 1690 retcode = ERR_CSUMS_RESYNC_RUNNING; 1691 goto fail; 1692 } 1693 1694 if (!rsr && sc.csums_alg[0]) { 1695 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC); 1696 if (IS_ERR(csums_tfm)) { 1697 csums_tfm = NULL; 1698 retcode = ERR_CSUMS_ALG; 1699 goto fail; 1700 } 1701 1702 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) { 1703 retcode = ERR_CSUMS_ALG_ND; 1704 goto fail; 1705 } 1706 } 1707 1708 /* online verify running */ 1709 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T); 1710 1711 if (ovr) { 1712 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) { 1713 retcode = ERR_VERIFY_RUNNING; 1714 goto fail; 1715 } 1716 } 1717 1718 if (!ovr && sc.verify_alg[0]) { 1719 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC); 1720 if (IS_ERR(verify_tfm)) { 1721 verify_tfm = NULL; 1722 retcode = ERR_VERIFY_ALG; 1723 goto fail; 1724 } 1725 1726 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) { 1727 retcode = ERR_VERIFY_ALG_ND; 1728 goto fail; 1729 } 1730 } 1731 1732 /* silently ignore cpu mask on UP kernel */ 1733 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) { 1734 err = __bitmap_parse(sc.cpu_mask, 32, 0, 1735 cpumask_bits(new_cpu_mask), nr_cpu_ids); 1736 if (err) { 1737 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err); 1738 retcode = ERR_CPU_MASK_PARSE; 1739 goto fail; 1740 } 1741 } 1742 1743 ERR_IF (sc.rate < 1) sc.rate = 1; 1744 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */ 1745#define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT) 1746 if (sc.al_extents > AL_MAX) { 1747 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX); 1748 sc.al_extents = AL_MAX; 1749 } 1750#undef AL_MAX 1751 1752 /* to avoid spurious errors when configuring minors before configuring 1753 * the minors they depend on: if necessary, first create the minor we 1754 * depend on */ 1755 if (sc.after >= 0) 1756 ensure_mdev(sc.after, 1); 1757 1758 /* most sanity checks done, try to assign the new sync-after 1759 * dependency. need to hold the global lock in there, 1760 * to avoid a race in the dependency loop check. */ 1761 retcode = drbd_alter_sa(mdev, sc.after); 1762 if (retcode != NO_ERROR) 1763 goto fail; 1764 1765 fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 1766 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 1767 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 1768 if (!rs_plan_s) { 1769 dev_err(DEV, "kmalloc of fifo_buffer failed"); 1770 retcode = ERR_NOMEM; 1771 goto fail; 1772 } 1773 } 1774 1775 /* ok, assign the rest of it as well. 1776 * lock against receive_SyncParam() */ 1777 spin_lock(&mdev->peer_seq_lock); 1778 mdev->sync_conf = sc; 1779 1780 if (!rsr) { 1781 crypto_free_hash(mdev->csums_tfm); 1782 mdev->csums_tfm = csums_tfm; 1783 csums_tfm = NULL; 1784 } 1785 1786 if (!ovr) { 1787 crypto_free_hash(mdev->verify_tfm); 1788 mdev->verify_tfm = verify_tfm; 1789 verify_tfm = NULL; 1790 } 1791 1792 if (fifo_size != mdev->rs_plan_s.size) { 1793 kfree(mdev->rs_plan_s.values); 1794 mdev->rs_plan_s.values = rs_plan_s; 1795 mdev->rs_plan_s.size = fifo_size; 1796 mdev->rs_planed = 0; 1797 rs_plan_s = NULL; 1798 } 1799 1800 spin_unlock(&mdev->peer_seq_lock); 1801 1802 if (get_ldev(mdev)) { 1803 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); 1804 drbd_al_shrink(mdev); 1805 err = drbd_check_al_size(mdev); 1806 lc_unlock(mdev->act_log); 1807 wake_up(&mdev->al_wait); 1808 1809 put_ldev(mdev); 1810 drbd_md_sync(mdev); 1811 1812 if (err) { 1813 retcode = ERR_NOMEM; 1814 goto fail; 1815 } 1816 } 1817 1818 if (mdev->state.conn >= C_CONNECTED) 1819 drbd_send_sync_param(mdev, &sc); 1820 1821 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) { 1822 cpumask_copy(mdev->cpu_mask, new_cpu_mask); 1823 drbd_calc_cpu_mask(mdev); 1824 mdev->receiver.reset_cpu_mask = 1; 1825 mdev->asender.reset_cpu_mask = 1; 1826 mdev->worker.reset_cpu_mask = 1; 1827 } 1828 1829 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1830fail: 1831 kfree(rs_plan_s); 1832 free_cpumask_var(new_cpu_mask); 1833 crypto_free_hash(csums_tfm); 1834 crypto_free_hash(verify_tfm); 1835 reply->ret_code = retcode; 1836 return 0; 1837} 1838 1839static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1840 struct drbd_nl_cfg_reply *reply) 1841{ 1842 int retcode; 1843 1844 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED); 1845 1846 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION) 1847 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1848 1849 while (retcode == SS_NEED_CONNECTION) { 1850 spin_lock_irq(&mdev->req_lock); 1851 if (mdev->state.conn < C_CONNECTED) 1852 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL); 1853 spin_unlock_irq(&mdev->req_lock); 1854 1855 if (retcode != SS_NEED_CONNECTION) 1856 break; 1857 1858 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1859 } 1860 1861 reply->ret_code = retcode; 1862 return 0; 1863} 1864 1865static int drbd_bmio_set_susp_al(struct drbd_conf *mdev) 1866{ 1867 int rv; 1868 1869 rv = drbd_bmio_set_n_write(mdev); 1870 drbd_suspend_al(mdev); 1871 return rv; 1872} 1873 1874static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1875 struct drbd_nl_cfg_reply *reply) 1876{ 1877 int retcode; 1878 1879 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED); 1880 1881 if (retcode < SS_SUCCESS) { 1882 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) { 1883 /* The peer will get a resync upon connect anyways. Just make that 1884 into a full resync. */ 1885 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT)); 1886 if (retcode >= SS_SUCCESS) { 1887 /* open coded drbd_bitmap_io() */ 1888 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al, 1889 "set_n_write from invalidate_peer")) 1890 retcode = ERR_IO_MD_DISK; 1891 } 1892 } else 1893 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S)); 1894 } 1895 1896 reply->ret_code = retcode; 1897 return 0; 1898} 1899 1900static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1901 struct drbd_nl_cfg_reply *reply) 1902{ 1903 int retcode = NO_ERROR; 1904 1905 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO) 1906 retcode = ERR_PAUSE_IS_SET; 1907 1908 reply->ret_code = retcode; 1909 return 0; 1910} 1911 1912static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1913 struct drbd_nl_cfg_reply *reply) 1914{ 1915 int retcode = NO_ERROR; 1916 1917 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) 1918 retcode = ERR_PAUSE_IS_CLEAR; 1919 1920 reply->ret_code = retcode; 1921 return 0; 1922} 1923 1924static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1925 struct drbd_nl_cfg_reply *reply) 1926{ 1927 reply->ret_code = drbd_request_state(mdev, NS(susp, 1)); 1928 1929 return 0; 1930} 1931 1932static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1933 struct drbd_nl_cfg_reply *reply) 1934{ 1935 if (test_bit(NEW_CUR_UUID, &mdev->flags)) { 1936 drbd_uuid_new_current(mdev); 1937 clear_bit(NEW_CUR_UUID, &mdev->flags); 1938 } 1939 drbd_suspend_io(mdev); 1940 reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0)); 1941 if (reply->ret_code == SS_SUCCESS) { 1942 if (mdev->state.conn < C_CONNECTED) 1943 tl_clear(mdev); 1944 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED) 1945 tl_restart(mdev, fail_frozen_disk_io); 1946 } 1947 drbd_resume_io(mdev); 1948 1949 return 0; 1950} 1951 1952static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1953 struct drbd_nl_cfg_reply *reply) 1954{ 1955 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED)); 1956 return 0; 1957} 1958 1959static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1960 struct drbd_nl_cfg_reply *reply) 1961{ 1962 unsigned short *tl; 1963 1964 tl = reply->tag_list; 1965 1966 if (get_ldev(mdev)) { 1967 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl); 1968 put_ldev(mdev); 1969 } 1970 1971 if (get_net_conf(mdev)) { 1972 tl = net_conf_to_tags(mdev, mdev->net_conf, tl); 1973 put_net_conf(mdev); 1974 } 1975 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl); 1976 1977 put_unaligned(TT_END, tl++); /* Close the tag list */ 1978 1979 return (int)((char *)tl - (char *)reply->tag_list); 1980} 1981 1982static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1983 struct drbd_nl_cfg_reply *reply) 1984{ 1985 unsigned short *tl = reply->tag_list; 1986 union drbd_state s = mdev->state; 1987 unsigned long rs_left; 1988 unsigned int res; 1989 1990 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl); 1991 1992 /* no local ref, no bitmap, no syncer progress. */ 1993 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) { 1994 if (get_ldev(mdev)) { 1995 drbd_get_syncer_progress(mdev, &rs_left, &res); 1996 tl = tl_add_int(tl, T_sync_progress, &res); 1997 put_ldev(mdev); 1998 } 1999 } 2000 put_unaligned(TT_END, tl++); /* Close the tag list */ 2001 2002 return (int)((char *)tl - (char *)reply->tag_list); 2003} 2004 2005static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2006 struct drbd_nl_cfg_reply *reply) 2007{ 2008 unsigned short *tl; 2009 2010 tl = reply->tag_list; 2011 2012 if (get_ldev(mdev)) { 2013 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64)); 2014 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags); 2015 put_ldev(mdev); 2016 } 2017 put_unaligned(TT_END, tl++); /* Close the tag list */ 2018 2019 return (int)((char *)tl - (char *)reply->tag_list); 2020} 2021 2022/** 2023 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use 2024 * @mdev: DRBD device. 2025 * @nlp: Netlink/connector packet from drbdsetup 2026 * @reply: Reply packet for drbdsetup 2027 */ 2028static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2029 struct drbd_nl_cfg_reply *reply) 2030{ 2031 unsigned short *tl; 2032 char rv; 2033 2034 tl = reply->tag_list; 2035 2036 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED : 2037 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT; 2038 2039 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv)); 2040 put_unaligned(TT_END, tl++); /* Close the tag list */ 2041 2042 return (int)((char *)tl - (char *)reply->tag_list); 2043} 2044 2045static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2046 struct drbd_nl_cfg_reply *reply) 2047{ 2048 /* default to resume from last known position, if possible */ 2049 struct start_ov args = 2050 { .start_sector = mdev->ov_start_sector }; 2051 2052 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) { 2053 reply->ret_code = ERR_MANDATORY_TAG; 2054 return 0; 2055 } 2056 /* w_make_ov_request expects position to be aligned */ 2057 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT; 2058 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S)); 2059 return 0; 2060} 2061 2062 2063static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2064 struct drbd_nl_cfg_reply *reply) 2065{ 2066 int retcode = NO_ERROR; 2067 int skip_initial_sync = 0; 2068 int err; 2069 2070 struct new_c_uuid args; 2071 2072 memset(&args, 0, sizeof(struct new_c_uuid)); 2073 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) { 2074 reply->ret_code = ERR_MANDATORY_TAG; 2075 return 0; 2076 } 2077 2078 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */ 2079 2080 if (!get_ldev(mdev)) { 2081 retcode = ERR_NO_DISK; 2082 goto out; 2083 } 2084 2085 /* this is "skip initial sync", assume to be clean */ 2086 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 && 2087 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) { 2088 dev_info(DEV, "Preparing to skip initial sync\n"); 2089 skip_initial_sync = 1; 2090 } else if (mdev->state.conn != C_STANDALONE) { 2091 retcode = ERR_CONNECTED; 2092 goto out_dec; 2093 } 2094 2095 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */ 2096 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */ 2097 2098 if (args.clear_bm) { 2099 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid"); 2100 if (err) { 2101 dev_err(DEV, "Writing bitmap failed with %d\n",err); 2102 retcode = ERR_IO_MD_DISK; 2103 } 2104 if (skip_initial_sync) { 2105 drbd_send_uuids_skip_initial_sync(mdev); 2106 _drbd_uuid_set(mdev, UI_BITMAP, 0); 2107 spin_lock_irq(&mdev->req_lock); 2108 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 2109 CS_VERBOSE, NULL); 2110 spin_unlock_irq(&mdev->req_lock); 2111 } 2112 } 2113 2114 drbd_md_sync(mdev); 2115out_dec: 2116 put_ldev(mdev); 2117out: 2118 mutex_unlock(&mdev->state_mutex); 2119 2120 reply->ret_code = retcode; 2121 return 0; 2122} 2123 2124struct cn_handler_struct { 2125 int (*function)(struct drbd_conf *, 2126 struct drbd_nl_cfg_req *, 2127 struct drbd_nl_cfg_reply *); 2128 int reply_body_size; 2129}; 2130 2131static struct cn_handler_struct cnd_table[] = { 2132 [ P_primary ] = { &drbd_nl_primary, 0 }, 2133 [ P_secondary ] = { &drbd_nl_secondary, 0 }, 2134 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 }, 2135 [ P_detach ] = { &drbd_nl_detach, 0 }, 2136 [ P_net_conf ] = { &drbd_nl_net_conf, 0 }, 2137 [ P_disconnect ] = { &drbd_nl_disconnect, 0 }, 2138 [ P_resize ] = { &drbd_nl_resize, 0 }, 2139 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 }, 2140 [ P_invalidate ] = { &drbd_nl_invalidate, 0 }, 2141 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 }, 2142 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 }, 2143 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 }, 2144 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 }, 2145 [ P_resume_io ] = { &drbd_nl_resume_io, 0 }, 2146 [ P_outdate ] = { &drbd_nl_outdate, 0 }, 2147 [ P_get_config ] = { &drbd_nl_get_config, 2148 sizeof(struct syncer_conf_tag_len_struct) + 2149 sizeof(struct disk_conf_tag_len_struct) + 2150 sizeof(struct net_conf_tag_len_struct) }, 2151 [ P_get_state ] = { &drbd_nl_get_state, 2152 sizeof(struct get_state_tag_len_struct) + 2153 sizeof(struct sync_progress_tag_len_struct) }, 2154 [ P_get_uuids ] = { &drbd_nl_get_uuids, 2155 sizeof(struct get_uuids_tag_len_struct) }, 2156 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag, 2157 sizeof(struct get_timeout_flag_tag_len_struct)}, 2158 [ P_start_ov ] = { &drbd_nl_start_ov, 0 }, 2159 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 }, 2160}; 2161 2162static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp) 2163{ 2164 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data; 2165 struct cn_handler_struct *cm; 2166 struct cn_msg *cn_reply; 2167 struct drbd_nl_cfg_reply *reply; 2168 struct drbd_conf *mdev; 2169 int retcode, rr; 2170 int reply_size = sizeof(struct cn_msg) 2171 + sizeof(struct drbd_nl_cfg_reply) 2172 + sizeof(short int); 2173 2174 if (!try_module_get(THIS_MODULE)) { 2175 printk(KERN_ERR "drbd: try_module_get() failed!\n"); 2176 return; 2177 } 2178 2179 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) { 2180 retcode = ERR_PERM; 2181 goto fail; 2182 } 2183 2184 mdev = ensure_mdev(nlp->drbd_minor, 2185 (nlp->flags & DRBD_NL_CREATE_DEVICE)); 2186 if (!mdev) { 2187 retcode = ERR_MINOR_INVALID; 2188 goto fail; 2189 } 2190 2191 if (nlp->packet_type >= P_nl_after_last_packet) { 2192 retcode = ERR_PACKET_NR; 2193 goto fail; 2194 } 2195 2196 cm = cnd_table + nlp->packet_type; 2197 2198 /* This may happen if packet number is 0: */ 2199 if (cm->function == NULL) { 2200 retcode = ERR_PACKET_NR; 2201 goto fail; 2202 } 2203 2204 reply_size += cm->reply_body_size; 2205 2206 /* allocation not in the IO path, cqueue thread context */ 2207 cn_reply = kmalloc(reply_size, GFP_KERNEL); 2208 if (!cn_reply) { 2209 retcode = ERR_NOMEM; 2210 goto fail; 2211 } 2212 reply = (struct drbd_nl_cfg_reply *) cn_reply->data; 2213 2214 reply->packet_type = 2215 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet; 2216 reply->minor = nlp->drbd_minor; 2217 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */ 2218 /* reply->tag_list; might be modified by cm->function. */ 2219 2220 rr = cm->function(mdev, nlp, reply); 2221 2222 cn_reply->id = req->id; 2223 cn_reply->seq = req->seq; 2224 cn_reply->ack = req->ack + 1; 2225 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr; 2226 cn_reply->flags = 0; 2227 2228 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL); 2229 if (rr && rr != -ESRCH) 2230 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2231 2232 kfree(cn_reply); 2233 module_put(THIS_MODULE); 2234 return; 2235 fail: 2236 drbd_nl_send_reply(req, retcode); 2237 module_put(THIS_MODULE); 2238} 2239 2240static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */ 2241 2242static unsigned short * 2243__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, 2244 unsigned short len, int nul_terminated) 2245{ 2246 unsigned short l = tag_descriptions[tag_number(tag)].max_len; 2247 len = (len < l) ? len : l; 2248 put_unaligned(tag, tl++); 2249 put_unaligned(len, tl++); 2250 memcpy(tl, data, len); 2251 tl = (unsigned short*)((char*)tl + len); 2252 if (nul_terminated) 2253 *((char*)tl - 1) = 0; 2254 return tl; 2255} 2256 2257static unsigned short * 2258tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len) 2259{ 2260 return __tl_add_blob(tl, tag, data, len, 0); 2261} 2262 2263static unsigned short * 2264tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str) 2265{ 2266 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0); 2267} 2268 2269static unsigned short * 2270tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val) 2271{ 2272 put_unaligned(tag, tl++); 2273 switch(tag_type(tag)) { 2274 case TT_INTEGER: 2275 put_unaligned(sizeof(int), tl++); 2276 put_unaligned(*(int *)val, (int *)tl); 2277 tl = (unsigned short*)((char*)tl+sizeof(int)); 2278 break; 2279 case TT_INT64: 2280 put_unaligned(sizeof(u64), tl++); 2281 put_unaligned(*(u64 *)val, (u64 *)tl); 2282 tl = (unsigned short*)((char*)tl+sizeof(u64)); 2283 break; 2284 default: 2285 /* someone did something stupid. */ 2286 ; 2287 } 2288 return tl; 2289} 2290 2291void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state) 2292{ 2293 char buffer[sizeof(struct cn_msg)+ 2294 sizeof(struct drbd_nl_cfg_reply)+ 2295 sizeof(struct get_state_tag_len_struct)+ 2296 sizeof(short int)]; 2297 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2298 struct drbd_nl_cfg_reply *reply = 2299 (struct drbd_nl_cfg_reply *)cn_reply->data; 2300 unsigned short *tl = reply->tag_list; 2301 2302 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2303 2304 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl); 2305 2306 put_unaligned(TT_END, tl++); /* Close the tag list */ 2307 2308 cn_reply->id.idx = CN_IDX_DRBD; 2309 cn_reply->id.val = CN_VAL_DRBD; 2310 2311 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2312 cn_reply->ack = 0; /* not used here. */ 2313 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2314 (int)((char *)tl - (char *)reply->tag_list); 2315 cn_reply->flags = 0; 2316 2317 reply->packet_type = P_get_state; 2318 reply->minor = mdev_to_minor(mdev); 2319 reply->ret_code = NO_ERROR; 2320 2321 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2322} 2323 2324void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name) 2325{ 2326 char buffer[sizeof(struct cn_msg)+ 2327 sizeof(struct drbd_nl_cfg_reply)+ 2328 sizeof(struct call_helper_tag_len_struct)+ 2329 sizeof(short int)]; 2330 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2331 struct drbd_nl_cfg_reply *reply = 2332 (struct drbd_nl_cfg_reply *)cn_reply->data; 2333 unsigned short *tl = reply->tag_list; 2334 2335 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2336 2337 tl = tl_add_str(tl, T_helper, helper_name); 2338 put_unaligned(TT_END, tl++); /* Close the tag list */ 2339 2340 cn_reply->id.idx = CN_IDX_DRBD; 2341 cn_reply->id.val = CN_VAL_DRBD; 2342 2343 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2344 cn_reply->ack = 0; /* not used here. */ 2345 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2346 (int)((char *)tl - (char *)reply->tag_list); 2347 cn_reply->flags = 0; 2348 2349 reply->packet_type = P_call_helper; 2350 reply->minor = mdev_to_minor(mdev); 2351 reply->ret_code = NO_ERROR; 2352 2353 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2354} 2355 2356void drbd_bcast_ee(struct drbd_conf *mdev, 2357 const char *reason, const int dgs, 2358 const char* seen_hash, const char* calc_hash, 2359 const struct drbd_epoch_entry* e) 2360{ 2361 struct cn_msg *cn_reply; 2362 struct drbd_nl_cfg_reply *reply; 2363 unsigned short *tl; 2364 struct page *page; 2365 unsigned len; 2366 2367 if (!e) 2368 return; 2369 if (!reason || !reason[0]) 2370 return; 2371 2372 /* apparently we have to memcpy twice, first to prepare the data for the 2373 * struct cn_msg, then within cn_netlink_send from the cn_msg to the 2374 * netlink skb. */ 2375 /* receiver thread context, which is not in the writeout path (of this node), 2376 * but may be in the writeout path of the _other_ node. 2377 * GFP_NOIO to avoid potential "distributed deadlock". */ 2378 cn_reply = kmalloc( 2379 sizeof(struct cn_msg)+ 2380 sizeof(struct drbd_nl_cfg_reply)+ 2381 sizeof(struct dump_ee_tag_len_struct)+ 2382 sizeof(short int), 2383 GFP_NOIO); 2384 2385 if (!cn_reply) { 2386 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n", 2387 (unsigned long long)e->sector, e->size); 2388 return; 2389 } 2390 2391 reply = (struct drbd_nl_cfg_reply*)cn_reply->data; 2392 tl = reply->tag_list; 2393 2394 tl = tl_add_str(tl, T_dump_ee_reason, reason); 2395 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs); 2396 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs); 2397 tl = tl_add_int(tl, T_ee_sector, &e->sector); 2398 tl = tl_add_int(tl, T_ee_block_id, &e->block_id); 2399 2400 /* dump the first 32k */ 2401 len = min_t(unsigned, e->size, 32 << 10); 2402 put_unaligned(T_ee_data, tl++); 2403 put_unaligned(len, tl++); 2404 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 if (len == 0) 2414 break; 2415 } 2416 put_unaligned(TT_END, tl++); /* Close the tag list */ 2417 2418 cn_reply->id.idx = CN_IDX_DRBD; 2419 cn_reply->id.val = CN_VAL_DRBD; 2420 2421 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq); 2422 cn_reply->ack = 0; // not used here. 2423 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2424 (int)((char*)tl - (char*)reply->tag_list); 2425 cn_reply->flags = 0; 2426 2427 reply->packet_type = P_dump_ee; 2428 reply->minor = mdev_to_minor(mdev); 2429 reply->ret_code = NO_ERROR; 2430 2431 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2432 kfree(cn_reply); 2433} 2434 2435void drbd_bcast_sync_progress(struct drbd_conf *mdev) 2436{ 2437 char buffer[sizeof(struct cn_msg)+ 2438 sizeof(struct drbd_nl_cfg_reply)+ 2439 sizeof(struct sync_progress_tag_len_struct)+ 2440 sizeof(short int)]; 2441 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2442 struct drbd_nl_cfg_reply *reply = 2443 (struct drbd_nl_cfg_reply *)cn_reply->data; 2444 unsigned short *tl = reply->tag_list; 2445 unsigned long rs_left; 2446 unsigned int res; 2447 2448 /* no local ref, no bitmap, no syncer progress, no broadcast. */ 2449 if (!get_ldev(mdev)) 2450 return; 2451 drbd_get_syncer_progress(mdev, &rs_left, &res); 2452 put_ldev(mdev); 2453 2454 tl = tl_add_int(tl, T_sync_progress, &res); 2455 put_unaligned(TT_END, tl++); /* Close the tag list */ 2456 2457 cn_reply->id.idx = CN_IDX_DRBD; 2458 cn_reply->id.val = CN_VAL_DRBD; 2459 2460 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2461 cn_reply->ack = 0; /* not used here. */ 2462 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2463 (int)((char *)tl - (char *)reply->tag_list); 2464 cn_reply->flags = 0; 2465 2466 reply->packet_type = P_sync_progress; 2467 reply->minor = mdev_to_minor(mdev); 2468 reply->ret_code = NO_ERROR; 2469 2470 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2471} 2472 2473int __init drbd_nl_init(void) 2474{ 2475 static struct cb_id cn_id_drbd; 2476 int err, try=10; 2477 2478 cn_id_drbd.val = CN_VAL_DRBD; 2479 do { 2480 cn_id_drbd.idx = cn_idx; 2481 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback); 2482 if (!err) 2483 break; 2484 cn_idx = (cn_idx + CN_IDX_STEP); 2485 } while (try--); 2486 2487 if (err) { 2488 printk(KERN_ERR "drbd: cn_drbd failed to register\n"); 2489 return err; 2490 } 2491 2492 return 0; 2493} 2494 2495void drbd_nl_cleanup(void) 2496{ 2497 static struct cb_id cn_id_drbd; 2498 2499 cn_id_drbd.idx = cn_idx; 2500 cn_id_drbd.val = CN_VAL_DRBD; 2501 2502 cn_del_callback(&cn_id_drbd); 2503} 2504 2505void drbd_nl_send_reply(struct cn_msg *req, int ret_code) 2506{ 2507 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)]; 2508 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2509 struct drbd_nl_cfg_reply *reply = 2510 (struct drbd_nl_cfg_reply *)cn_reply->data; 2511 int rr; 2512 2513 cn_reply->id = req->id; 2514 2515 cn_reply->seq = req->seq; 2516 cn_reply->ack = req->ack + 1; 2517 cn_reply->len = sizeof(struct drbd_nl_cfg_reply); 2518 cn_reply->flags = 0; 2519 2520 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor; 2521 reply->ret_code = ret_code; 2522 2523 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2524 if (rr && rr != -ESRCH) 2525 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2526} 2527 2528