drbd_nl.c revision 3e3a7766c2e6995ac98e7855017abc3544d54e08
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 new_conf->on_congestion = DRBD_ON_CONGESTION_DEF; 1327 new_conf->cong_extents = DRBD_CONG_EXTENTS_DEF; 1328 1329 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) { 1330 retcode = ERR_MANDATORY_TAG; 1331 goto fail; 1332 } 1333 1334 if (new_conf->two_primaries 1335 && (new_conf->wire_protocol != DRBD_PROT_C)) { 1336 retcode = ERR_NOT_PROTO_C; 1337 goto fail; 1338 } 1339 1340 if (get_ldev(mdev)) { 1341 enum drbd_fencing_p fp = mdev->ldev->dc.fencing; 1342 put_ldev(mdev); 1343 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) { 1344 retcode = ERR_STONITH_AND_PROT_A; 1345 goto fail; 1346 } 1347 } 1348 1349 if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A) { 1350 retcode = ERR_CONG_NOT_PROTO_A; 1351 goto fail; 1352 } 1353 1354 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) { 1355 retcode = ERR_DISCARD; 1356 goto fail; 1357 } 1358 1359 retcode = NO_ERROR; 1360 1361 new_my_addr = (struct sockaddr *)&new_conf->my_addr; 1362 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr; 1363 for (i = 0; i < minor_count; i++) { 1364 odev = minor_to_mdev(i); 1365 if (!odev || odev == mdev) 1366 continue; 1367 if (get_net_conf(odev)) { 1368 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr; 1369 if (new_conf->my_addr_len == odev->net_conf->my_addr_len && 1370 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len)) 1371 retcode = ERR_LOCAL_ADDR; 1372 1373 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr; 1374 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len && 1375 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len)) 1376 retcode = ERR_PEER_ADDR; 1377 1378 put_net_conf(odev); 1379 if (retcode != NO_ERROR) 1380 goto fail; 1381 } 1382 } 1383 1384 if (new_conf->cram_hmac_alg[0] != 0) { 1385 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", 1386 new_conf->cram_hmac_alg); 1387 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC); 1388 if (IS_ERR(tfm)) { 1389 tfm = NULL; 1390 retcode = ERR_AUTH_ALG; 1391 goto fail; 1392 } 1393 1394 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 1395 retcode = ERR_AUTH_ALG_ND; 1396 goto fail; 1397 } 1398 } 1399 1400 if (new_conf->integrity_alg[0]) { 1401 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1402 if (IS_ERR(integrity_w_tfm)) { 1403 integrity_w_tfm = NULL; 1404 retcode=ERR_INTEGRITY_ALG; 1405 goto fail; 1406 } 1407 1408 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) { 1409 retcode=ERR_INTEGRITY_ALG_ND; 1410 goto fail; 1411 } 1412 1413 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1414 if (IS_ERR(integrity_r_tfm)) { 1415 integrity_r_tfm = NULL; 1416 retcode=ERR_INTEGRITY_ALG; 1417 goto fail; 1418 } 1419 } 1420 1421 ns = new_conf->max_epoch_size/8; 1422 if (mdev->tl_hash_s != ns) { 1423 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1424 if (!new_tl_hash) { 1425 retcode = ERR_NOMEM; 1426 goto fail; 1427 } 1428 } 1429 1430 ns = new_conf->max_buffers/8; 1431 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) { 1432 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1433 if (!new_ee_hash) { 1434 retcode = ERR_NOMEM; 1435 goto fail; 1436 } 1437 } 1438 1439 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0; 1440 1441 if (integrity_w_tfm) { 1442 i = crypto_hash_digestsize(integrity_w_tfm); 1443 int_dig_out = kmalloc(i, GFP_KERNEL); 1444 if (!int_dig_out) { 1445 retcode = ERR_NOMEM; 1446 goto fail; 1447 } 1448 int_dig_in = kmalloc(i, GFP_KERNEL); 1449 if (!int_dig_in) { 1450 retcode = ERR_NOMEM; 1451 goto fail; 1452 } 1453 int_dig_vv = kmalloc(i, GFP_KERNEL); 1454 if (!int_dig_vv) { 1455 retcode = ERR_NOMEM; 1456 goto fail; 1457 } 1458 } 1459 1460 if (!mdev->bitmap) { 1461 if(drbd_bm_init(mdev)) { 1462 retcode = ERR_NOMEM; 1463 goto fail; 1464 } 1465 } 1466 1467 drbd_flush_workqueue(mdev); 1468 spin_lock_irq(&mdev->req_lock); 1469 if (mdev->net_conf != NULL) { 1470 retcode = ERR_NET_CONFIGURED; 1471 spin_unlock_irq(&mdev->req_lock); 1472 goto fail; 1473 } 1474 mdev->net_conf = new_conf; 1475 1476 mdev->send_cnt = 0; 1477 mdev->recv_cnt = 0; 1478 1479 if (new_tl_hash) { 1480 kfree(mdev->tl_hash); 1481 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8; 1482 mdev->tl_hash = new_tl_hash; 1483 } 1484 1485 if (new_ee_hash) { 1486 kfree(mdev->ee_hash); 1487 mdev->ee_hash_s = mdev->net_conf->max_buffers/8; 1488 mdev->ee_hash = new_ee_hash; 1489 } 1490 1491 crypto_free_hash(mdev->cram_hmac_tfm); 1492 mdev->cram_hmac_tfm = tfm; 1493 1494 crypto_free_hash(mdev->integrity_w_tfm); 1495 mdev->integrity_w_tfm = integrity_w_tfm; 1496 1497 crypto_free_hash(mdev->integrity_r_tfm); 1498 mdev->integrity_r_tfm = integrity_r_tfm; 1499 1500 kfree(mdev->int_dig_out); 1501 kfree(mdev->int_dig_in); 1502 kfree(mdev->int_dig_vv); 1503 mdev->int_dig_out=int_dig_out; 1504 mdev->int_dig_in=int_dig_in; 1505 mdev->int_dig_vv=int_dig_vv; 1506 retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL); 1507 spin_unlock_irq(&mdev->req_lock); 1508 1509 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1510 reply->ret_code = retcode; 1511 drbd_reconfig_done(mdev); 1512 return 0; 1513 1514fail: 1515 kfree(int_dig_out); 1516 kfree(int_dig_in); 1517 kfree(int_dig_vv); 1518 crypto_free_hash(tfm); 1519 crypto_free_hash(integrity_w_tfm); 1520 crypto_free_hash(integrity_r_tfm); 1521 kfree(new_tl_hash); 1522 kfree(new_ee_hash); 1523 kfree(new_conf); 1524 1525 reply->ret_code = retcode; 1526 drbd_reconfig_done(mdev); 1527 return 0; 1528} 1529 1530static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1531 struct drbd_nl_cfg_reply *reply) 1532{ 1533 int retcode; 1534 1535 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED); 1536 1537 if (retcode == SS_NOTHING_TO_DO) 1538 goto done; 1539 else if (retcode == SS_ALREADY_STANDALONE) 1540 goto done; 1541 else if (retcode == SS_PRIMARY_NOP) { 1542 /* Our statche checking code wants to see the peer outdated. */ 1543 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1544 pdsk, D_OUTDATED)); 1545 } else if (retcode == SS_CW_FAILED_BY_PEER) { 1546 /* The peer probably wants to see us outdated. */ 1547 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1548 disk, D_OUTDATED), 1549 CS_ORDERED); 1550 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) { 1551 drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 1552 retcode = SS_SUCCESS; 1553 } 1554 } 1555 1556 if (retcode < SS_SUCCESS) 1557 goto fail; 1558 1559 if (wait_event_interruptible(mdev->state_wait, 1560 mdev->state.conn != C_DISCONNECTING)) { 1561 /* Do not test for mdev->state.conn == C_STANDALONE, since 1562 someone else might connect us in the mean time! */ 1563 retcode = ERR_INTR; 1564 goto fail; 1565 } 1566 1567 done: 1568 retcode = NO_ERROR; 1569 fail: 1570 drbd_md_sync(mdev); 1571 reply->ret_code = retcode; 1572 return 0; 1573} 1574 1575void resync_after_online_grow(struct drbd_conf *mdev) 1576{ 1577 int iass; /* I am sync source */ 1578 1579 dev_info(DEV, "Resync of new storage after online grow\n"); 1580 if (mdev->state.role != mdev->state.peer) 1581 iass = (mdev->state.role == R_PRIMARY); 1582 else 1583 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1584 1585 if (iass) 1586 drbd_start_resync(mdev, C_SYNC_SOURCE); 1587 else 1588 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE); 1589} 1590 1591static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1592 struct drbd_nl_cfg_reply *reply) 1593{ 1594 struct resize rs; 1595 int retcode = NO_ERROR; 1596 enum determine_dev_size dd; 1597 enum dds_flags ddsf; 1598 1599 memset(&rs, 0, sizeof(struct resize)); 1600 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) { 1601 retcode = ERR_MANDATORY_TAG; 1602 goto fail; 1603 } 1604 1605 if (mdev->state.conn > C_CONNECTED) { 1606 retcode = ERR_RESIZE_RESYNC; 1607 goto fail; 1608 } 1609 1610 if (mdev->state.role == R_SECONDARY && 1611 mdev->state.peer == R_SECONDARY) { 1612 retcode = ERR_NO_PRIMARY; 1613 goto fail; 1614 } 1615 1616 if (!get_ldev(mdev)) { 1617 retcode = ERR_NO_DISK; 1618 goto fail; 1619 } 1620 1621 if (rs.no_resync && mdev->agreed_pro_version < 93) { 1622 retcode = ERR_NEED_APV_93; 1623 goto fail; 1624 } 1625 1626 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) 1627 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 1628 1629 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size; 1630 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0); 1631 dd = drbd_determin_dev_size(mdev, ddsf); 1632 drbd_md_sync(mdev); 1633 put_ldev(mdev); 1634 if (dd == dev_size_error) { 1635 retcode = ERR_NOMEM_BITMAP; 1636 goto fail; 1637 } 1638 1639 if (mdev->state.conn == C_CONNECTED) { 1640 if (dd == grew) 1641 set_bit(RESIZE_PENDING, &mdev->flags); 1642 1643 drbd_send_uuids(mdev); 1644 drbd_send_sizes(mdev, 1, ddsf); 1645 } 1646 1647 fail: 1648 reply->ret_code = retcode; 1649 return 0; 1650} 1651 1652static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1653 struct drbd_nl_cfg_reply *reply) 1654{ 1655 int retcode = NO_ERROR; 1656 int err; 1657 int ovr; /* online verify running */ 1658 int rsr; /* re-sync running */ 1659 struct crypto_hash *verify_tfm = NULL; 1660 struct crypto_hash *csums_tfm = NULL; 1661 struct syncer_conf sc; 1662 cpumask_var_t new_cpu_mask; 1663 int *rs_plan_s = NULL; 1664 int fifo_size; 1665 1666 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) { 1667 retcode = ERR_NOMEM; 1668 goto fail; 1669 } 1670 1671 if (nlp->flags & DRBD_NL_SET_DEFAULTS) { 1672 memset(&sc, 0, sizeof(struct syncer_conf)); 1673 sc.rate = DRBD_RATE_DEF; 1674 sc.after = DRBD_AFTER_DEF; 1675 sc.al_extents = DRBD_AL_EXTENTS_DEF; 1676 sc.on_no_data = DRBD_ON_NO_DATA_DEF; 1677 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF; 1678 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF; 1679 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF; 1680 sc.c_max_rate = DRBD_C_MAX_RATE_DEF; 1681 sc.c_min_rate = DRBD_C_MIN_RATE_DEF; 1682 } else 1683 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf)); 1684 1685 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) { 1686 retcode = ERR_MANDATORY_TAG; 1687 goto fail; 1688 } 1689 1690 /* re-sync running */ 1691 rsr = ( mdev->state.conn == C_SYNC_SOURCE || 1692 mdev->state.conn == C_SYNC_TARGET || 1693 mdev->state.conn == C_PAUSED_SYNC_S || 1694 mdev->state.conn == C_PAUSED_SYNC_T ); 1695 1696 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) { 1697 retcode = ERR_CSUMS_RESYNC_RUNNING; 1698 goto fail; 1699 } 1700 1701 if (!rsr && sc.csums_alg[0]) { 1702 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC); 1703 if (IS_ERR(csums_tfm)) { 1704 csums_tfm = NULL; 1705 retcode = ERR_CSUMS_ALG; 1706 goto fail; 1707 } 1708 1709 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) { 1710 retcode = ERR_CSUMS_ALG_ND; 1711 goto fail; 1712 } 1713 } 1714 1715 /* online verify running */ 1716 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T); 1717 1718 if (ovr) { 1719 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) { 1720 retcode = ERR_VERIFY_RUNNING; 1721 goto fail; 1722 } 1723 } 1724 1725 if (!ovr && sc.verify_alg[0]) { 1726 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC); 1727 if (IS_ERR(verify_tfm)) { 1728 verify_tfm = NULL; 1729 retcode = ERR_VERIFY_ALG; 1730 goto fail; 1731 } 1732 1733 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) { 1734 retcode = ERR_VERIFY_ALG_ND; 1735 goto fail; 1736 } 1737 } 1738 1739 /* silently ignore cpu mask on UP kernel */ 1740 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) { 1741 err = __bitmap_parse(sc.cpu_mask, 32, 0, 1742 cpumask_bits(new_cpu_mask), nr_cpu_ids); 1743 if (err) { 1744 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err); 1745 retcode = ERR_CPU_MASK_PARSE; 1746 goto fail; 1747 } 1748 } 1749 1750 ERR_IF (sc.rate < 1) sc.rate = 1; 1751 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */ 1752#define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT) 1753 if (sc.al_extents > AL_MAX) { 1754 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX); 1755 sc.al_extents = AL_MAX; 1756 } 1757#undef AL_MAX 1758 1759 /* to avoid spurious errors when configuring minors before configuring 1760 * the minors they depend on: if necessary, first create the minor we 1761 * depend on */ 1762 if (sc.after >= 0) 1763 ensure_mdev(sc.after, 1); 1764 1765 /* most sanity checks done, try to assign the new sync-after 1766 * dependency. need to hold the global lock in there, 1767 * to avoid a race in the dependency loop check. */ 1768 retcode = drbd_alter_sa(mdev, sc.after); 1769 if (retcode != NO_ERROR) 1770 goto fail; 1771 1772 fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 1773 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 1774 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 1775 if (!rs_plan_s) { 1776 dev_err(DEV, "kmalloc of fifo_buffer failed"); 1777 retcode = ERR_NOMEM; 1778 goto fail; 1779 } 1780 } 1781 1782 /* ok, assign the rest of it as well. 1783 * lock against receive_SyncParam() */ 1784 spin_lock(&mdev->peer_seq_lock); 1785 mdev->sync_conf = sc; 1786 1787 if (!rsr) { 1788 crypto_free_hash(mdev->csums_tfm); 1789 mdev->csums_tfm = csums_tfm; 1790 csums_tfm = NULL; 1791 } 1792 1793 if (!ovr) { 1794 crypto_free_hash(mdev->verify_tfm); 1795 mdev->verify_tfm = verify_tfm; 1796 verify_tfm = NULL; 1797 } 1798 1799 if (fifo_size != mdev->rs_plan_s.size) { 1800 kfree(mdev->rs_plan_s.values); 1801 mdev->rs_plan_s.values = rs_plan_s; 1802 mdev->rs_plan_s.size = fifo_size; 1803 mdev->rs_planed = 0; 1804 rs_plan_s = NULL; 1805 } 1806 1807 spin_unlock(&mdev->peer_seq_lock); 1808 1809 if (get_ldev(mdev)) { 1810 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); 1811 drbd_al_shrink(mdev); 1812 err = drbd_check_al_size(mdev); 1813 lc_unlock(mdev->act_log); 1814 wake_up(&mdev->al_wait); 1815 1816 put_ldev(mdev); 1817 drbd_md_sync(mdev); 1818 1819 if (err) { 1820 retcode = ERR_NOMEM; 1821 goto fail; 1822 } 1823 } 1824 1825 if (mdev->state.conn >= C_CONNECTED) 1826 drbd_send_sync_param(mdev, &sc); 1827 1828 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) { 1829 cpumask_copy(mdev->cpu_mask, new_cpu_mask); 1830 drbd_calc_cpu_mask(mdev); 1831 mdev->receiver.reset_cpu_mask = 1; 1832 mdev->asender.reset_cpu_mask = 1; 1833 mdev->worker.reset_cpu_mask = 1; 1834 } 1835 1836 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1837fail: 1838 kfree(rs_plan_s); 1839 free_cpumask_var(new_cpu_mask); 1840 crypto_free_hash(csums_tfm); 1841 crypto_free_hash(verify_tfm); 1842 reply->ret_code = retcode; 1843 return 0; 1844} 1845 1846static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1847 struct drbd_nl_cfg_reply *reply) 1848{ 1849 int retcode; 1850 1851 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED); 1852 1853 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION) 1854 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1855 1856 while (retcode == SS_NEED_CONNECTION) { 1857 spin_lock_irq(&mdev->req_lock); 1858 if (mdev->state.conn < C_CONNECTED) 1859 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL); 1860 spin_unlock_irq(&mdev->req_lock); 1861 1862 if (retcode != SS_NEED_CONNECTION) 1863 break; 1864 1865 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1866 } 1867 1868 reply->ret_code = retcode; 1869 return 0; 1870} 1871 1872static int drbd_bmio_set_susp_al(struct drbd_conf *mdev) 1873{ 1874 int rv; 1875 1876 rv = drbd_bmio_set_n_write(mdev); 1877 drbd_suspend_al(mdev); 1878 return rv; 1879} 1880 1881static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1882 struct drbd_nl_cfg_reply *reply) 1883{ 1884 int retcode; 1885 1886 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED); 1887 1888 if (retcode < SS_SUCCESS) { 1889 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) { 1890 /* The peer will get a resync upon connect anyways. Just make that 1891 into a full resync. */ 1892 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT)); 1893 if (retcode >= SS_SUCCESS) { 1894 /* open coded drbd_bitmap_io() */ 1895 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al, 1896 "set_n_write from invalidate_peer")) 1897 retcode = ERR_IO_MD_DISK; 1898 } 1899 } else 1900 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S)); 1901 } 1902 1903 reply->ret_code = retcode; 1904 return 0; 1905} 1906 1907static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1908 struct drbd_nl_cfg_reply *reply) 1909{ 1910 int retcode = NO_ERROR; 1911 1912 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO) 1913 retcode = ERR_PAUSE_IS_SET; 1914 1915 reply->ret_code = retcode; 1916 return 0; 1917} 1918 1919static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1920 struct drbd_nl_cfg_reply *reply) 1921{ 1922 int retcode = NO_ERROR; 1923 1924 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) 1925 retcode = ERR_PAUSE_IS_CLEAR; 1926 1927 reply->ret_code = retcode; 1928 return 0; 1929} 1930 1931static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1932 struct drbd_nl_cfg_reply *reply) 1933{ 1934 reply->ret_code = drbd_request_state(mdev, NS(susp, 1)); 1935 1936 return 0; 1937} 1938 1939static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1940 struct drbd_nl_cfg_reply *reply) 1941{ 1942 if (test_bit(NEW_CUR_UUID, &mdev->flags)) { 1943 drbd_uuid_new_current(mdev); 1944 clear_bit(NEW_CUR_UUID, &mdev->flags); 1945 } 1946 drbd_suspend_io(mdev); 1947 reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0)); 1948 if (reply->ret_code == SS_SUCCESS) { 1949 if (mdev->state.conn < C_CONNECTED) 1950 tl_clear(mdev); 1951 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED) 1952 tl_restart(mdev, fail_frozen_disk_io); 1953 } 1954 drbd_resume_io(mdev); 1955 1956 return 0; 1957} 1958 1959static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1960 struct drbd_nl_cfg_reply *reply) 1961{ 1962 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED)); 1963 return 0; 1964} 1965 1966static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1967 struct drbd_nl_cfg_reply *reply) 1968{ 1969 unsigned short *tl; 1970 1971 tl = reply->tag_list; 1972 1973 if (get_ldev(mdev)) { 1974 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl); 1975 put_ldev(mdev); 1976 } 1977 1978 if (get_net_conf(mdev)) { 1979 tl = net_conf_to_tags(mdev, mdev->net_conf, tl); 1980 put_net_conf(mdev); 1981 } 1982 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl); 1983 1984 put_unaligned(TT_END, tl++); /* Close the tag list */ 1985 1986 return (int)((char *)tl - (char *)reply->tag_list); 1987} 1988 1989static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1990 struct drbd_nl_cfg_reply *reply) 1991{ 1992 unsigned short *tl = reply->tag_list; 1993 union drbd_state s = mdev->state; 1994 unsigned long rs_left; 1995 unsigned int res; 1996 1997 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl); 1998 1999 /* no local ref, no bitmap, no syncer progress. */ 2000 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) { 2001 if (get_ldev(mdev)) { 2002 drbd_get_syncer_progress(mdev, &rs_left, &res); 2003 tl = tl_add_int(tl, T_sync_progress, &res); 2004 put_ldev(mdev); 2005 } 2006 } 2007 put_unaligned(TT_END, tl++); /* Close the tag list */ 2008 2009 return (int)((char *)tl - (char *)reply->tag_list); 2010} 2011 2012static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2013 struct drbd_nl_cfg_reply *reply) 2014{ 2015 unsigned short *tl; 2016 2017 tl = reply->tag_list; 2018 2019 if (get_ldev(mdev)) { 2020 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64)); 2021 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags); 2022 put_ldev(mdev); 2023 } 2024 put_unaligned(TT_END, tl++); /* Close the tag list */ 2025 2026 return (int)((char *)tl - (char *)reply->tag_list); 2027} 2028 2029/** 2030 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use 2031 * @mdev: DRBD device. 2032 * @nlp: Netlink/connector packet from drbdsetup 2033 * @reply: Reply packet for drbdsetup 2034 */ 2035static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2036 struct drbd_nl_cfg_reply *reply) 2037{ 2038 unsigned short *tl; 2039 char rv; 2040 2041 tl = reply->tag_list; 2042 2043 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED : 2044 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT; 2045 2046 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv)); 2047 put_unaligned(TT_END, tl++); /* Close the tag list */ 2048 2049 return (int)((char *)tl - (char *)reply->tag_list); 2050} 2051 2052static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2053 struct drbd_nl_cfg_reply *reply) 2054{ 2055 /* default to resume from last known position, if possible */ 2056 struct start_ov args = 2057 { .start_sector = mdev->ov_start_sector }; 2058 2059 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) { 2060 reply->ret_code = ERR_MANDATORY_TAG; 2061 return 0; 2062 } 2063 /* w_make_ov_request expects position to be aligned */ 2064 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT; 2065 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S)); 2066 return 0; 2067} 2068 2069 2070static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2071 struct drbd_nl_cfg_reply *reply) 2072{ 2073 int retcode = NO_ERROR; 2074 int skip_initial_sync = 0; 2075 int err; 2076 2077 struct new_c_uuid args; 2078 2079 memset(&args, 0, sizeof(struct new_c_uuid)); 2080 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) { 2081 reply->ret_code = ERR_MANDATORY_TAG; 2082 return 0; 2083 } 2084 2085 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */ 2086 2087 if (!get_ldev(mdev)) { 2088 retcode = ERR_NO_DISK; 2089 goto out; 2090 } 2091 2092 /* this is "skip initial sync", assume to be clean */ 2093 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 && 2094 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) { 2095 dev_info(DEV, "Preparing to skip initial sync\n"); 2096 skip_initial_sync = 1; 2097 } else if (mdev->state.conn != C_STANDALONE) { 2098 retcode = ERR_CONNECTED; 2099 goto out_dec; 2100 } 2101 2102 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */ 2103 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */ 2104 2105 if (args.clear_bm) { 2106 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid"); 2107 if (err) { 2108 dev_err(DEV, "Writing bitmap failed with %d\n",err); 2109 retcode = ERR_IO_MD_DISK; 2110 } 2111 if (skip_initial_sync) { 2112 drbd_send_uuids_skip_initial_sync(mdev); 2113 _drbd_uuid_set(mdev, UI_BITMAP, 0); 2114 spin_lock_irq(&mdev->req_lock); 2115 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 2116 CS_VERBOSE, NULL); 2117 spin_unlock_irq(&mdev->req_lock); 2118 } 2119 } 2120 2121 drbd_md_sync(mdev); 2122out_dec: 2123 put_ldev(mdev); 2124out: 2125 mutex_unlock(&mdev->state_mutex); 2126 2127 reply->ret_code = retcode; 2128 return 0; 2129} 2130 2131struct cn_handler_struct { 2132 int (*function)(struct drbd_conf *, 2133 struct drbd_nl_cfg_req *, 2134 struct drbd_nl_cfg_reply *); 2135 int reply_body_size; 2136}; 2137 2138static struct cn_handler_struct cnd_table[] = { 2139 [ P_primary ] = { &drbd_nl_primary, 0 }, 2140 [ P_secondary ] = { &drbd_nl_secondary, 0 }, 2141 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 }, 2142 [ P_detach ] = { &drbd_nl_detach, 0 }, 2143 [ P_net_conf ] = { &drbd_nl_net_conf, 0 }, 2144 [ P_disconnect ] = { &drbd_nl_disconnect, 0 }, 2145 [ P_resize ] = { &drbd_nl_resize, 0 }, 2146 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 }, 2147 [ P_invalidate ] = { &drbd_nl_invalidate, 0 }, 2148 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 }, 2149 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 }, 2150 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 }, 2151 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 }, 2152 [ P_resume_io ] = { &drbd_nl_resume_io, 0 }, 2153 [ P_outdate ] = { &drbd_nl_outdate, 0 }, 2154 [ P_get_config ] = { &drbd_nl_get_config, 2155 sizeof(struct syncer_conf_tag_len_struct) + 2156 sizeof(struct disk_conf_tag_len_struct) + 2157 sizeof(struct net_conf_tag_len_struct) }, 2158 [ P_get_state ] = { &drbd_nl_get_state, 2159 sizeof(struct get_state_tag_len_struct) + 2160 sizeof(struct sync_progress_tag_len_struct) }, 2161 [ P_get_uuids ] = { &drbd_nl_get_uuids, 2162 sizeof(struct get_uuids_tag_len_struct) }, 2163 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag, 2164 sizeof(struct get_timeout_flag_tag_len_struct)}, 2165 [ P_start_ov ] = { &drbd_nl_start_ov, 0 }, 2166 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 }, 2167}; 2168 2169static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp) 2170{ 2171 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data; 2172 struct cn_handler_struct *cm; 2173 struct cn_msg *cn_reply; 2174 struct drbd_nl_cfg_reply *reply; 2175 struct drbd_conf *mdev; 2176 int retcode, rr; 2177 int reply_size = sizeof(struct cn_msg) 2178 + sizeof(struct drbd_nl_cfg_reply) 2179 + sizeof(short int); 2180 2181 if (!try_module_get(THIS_MODULE)) { 2182 printk(KERN_ERR "drbd: try_module_get() failed!\n"); 2183 return; 2184 } 2185 2186 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) { 2187 retcode = ERR_PERM; 2188 goto fail; 2189 } 2190 2191 mdev = ensure_mdev(nlp->drbd_minor, 2192 (nlp->flags & DRBD_NL_CREATE_DEVICE)); 2193 if (!mdev) { 2194 retcode = ERR_MINOR_INVALID; 2195 goto fail; 2196 } 2197 2198 if (nlp->packet_type >= P_nl_after_last_packet) { 2199 retcode = ERR_PACKET_NR; 2200 goto fail; 2201 } 2202 2203 cm = cnd_table + nlp->packet_type; 2204 2205 /* This may happen if packet number is 0: */ 2206 if (cm->function == NULL) { 2207 retcode = ERR_PACKET_NR; 2208 goto fail; 2209 } 2210 2211 reply_size += cm->reply_body_size; 2212 2213 /* allocation not in the IO path, cqueue thread context */ 2214 cn_reply = kzalloc(reply_size, GFP_KERNEL); 2215 if (!cn_reply) { 2216 retcode = ERR_NOMEM; 2217 goto fail; 2218 } 2219 reply = (struct drbd_nl_cfg_reply *) cn_reply->data; 2220 2221 reply->packet_type = 2222 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet; 2223 reply->minor = nlp->drbd_minor; 2224 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */ 2225 /* reply->tag_list; might be modified by cm->function. */ 2226 2227 rr = cm->function(mdev, nlp, reply); 2228 2229 cn_reply->id = req->id; 2230 cn_reply->seq = req->seq; 2231 cn_reply->ack = req->ack + 1; 2232 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr; 2233 cn_reply->flags = 0; 2234 2235 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL); 2236 if (rr && rr != -ESRCH) 2237 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2238 2239 kfree(cn_reply); 2240 module_put(THIS_MODULE); 2241 return; 2242 fail: 2243 drbd_nl_send_reply(req, retcode); 2244 module_put(THIS_MODULE); 2245} 2246 2247static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */ 2248 2249static unsigned short * 2250__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, 2251 unsigned short len, int nul_terminated) 2252{ 2253 unsigned short l = tag_descriptions[tag_number(tag)].max_len; 2254 len = (len < l) ? len : l; 2255 put_unaligned(tag, tl++); 2256 put_unaligned(len, tl++); 2257 memcpy(tl, data, len); 2258 tl = (unsigned short*)((char*)tl + len); 2259 if (nul_terminated) 2260 *((char*)tl - 1) = 0; 2261 return tl; 2262} 2263 2264static unsigned short * 2265tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len) 2266{ 2267 return __tl_add_blob(tl, tag, data, len, 0); 2268} 2269 2270static unsigned short * 2271tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str) 2272{ 2273 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0); 2274} 2275 2276static unsigned short * 2277tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val) 2278{ 2279 put_unaligned(tag, tl++); 2280 switch(tag_type(tag)) { 2281 case TT_INTEGER: 2282 put_unaligned(sizeof(int), tl++); 2283 put_unaligned(*(int *)val, (int *)tl); 2284 tl = (unsigned short*)((char*)tl+sizeof(int)); 2285 break; 2286 case TT_INT64: 2287 put_unaligned(sizeof(u64), tl++); 2288 put_unaligned(*(u64 *)val, (u64 *)tl); 2289 tl = (unsigned short*)((char*)tl+sizeof(u64)); 2290 break; 2291 default: 2292 /* someone did something stupid. */ 2293 ; 2294 } 2295 return tl; 2296} 2297 2298void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state) 2299{ 2300 char buffer[sizeof(struct cn_msg)+ 2301 sizeof(struct drbd_nl_cfg_reply)+ 2302 sizeof(struct get_state_tag_len_struct)+ 2303 sizeof(short int)]; 2304 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2305 struct drbd_nl_cfg_reply *reply = 2306 (struct drbd_nl_cfg_reply *)cn_reply->data; 2307 unsigned short *tl = reply->tag_list; 2308 2309 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2310 2311 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl); 2312 2313 put_unaligned(TT_END, tl++); /* Close the tag list */ 2314 2315 cn_reply->id.idx = CN_IDX_DRBD; 2316 cn_reply->id.val = CN_VAL_DRBD; 2317 2318 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2319 cn_reply->ack = 0; /* not used here. */ 2320 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2321 (int)((char *)tl - (char *)reply->tag_list); 2322 cn_reply->flags = 0; 2323 2324 reply->packet_type = P_get_state; 2325 reply->minor = mdev_to_minor(mdev); 2326 reply->ret_code = NO_ERROR; 2327 2328 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2329} 2330 2331void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name) 2332{ 2333 char buffer[sizeof(struct cn_msg)+ 2334 sizeof(struct drbd_nl_cfg_reply)+ 2335 sizeof(struct call_helper_tag_len_struct)+ 2336 sizeof(short int)]; 2337 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2338 struct drbd_nl_cfg_reply *reply = 2339 (struct drbd_nl_cfg_reply *)cn_reply->data; 2340 unsigned short *tl = reply->tag_list; 2341 2342 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2343 2344 tl = tl_add_str(tl, T_helper, helper_name); 2345 put_unaligned(TT_END, tl++); /* Close the tag list */ 2346 2347 cn_reply->id.idx = CN_IDX_DRBD; 2348 cn_reply->id.val = CN_VAL_DRBD; 2349 2350 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2351 cn_reply->ack = 0; /* not used here. */ 2352 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2353 (int)((char *)tl - (char *)reply->tag_list); 2354 cn_reply->flags = 0; 2355 2356 reply->packet_type = P_call_helper; 2357 reply->minor = mdev_to_minor(mdev); 2358 reply->ret_code = NO_ERROR; 2359 2360 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2361} 2362 2363void drbd_bcast_ee(struct drbd_conf *mdev, 2364 const char *reason, const int dgs, 2365 const char* seen_hash, const char* calc_hash, 2366 const struct drbd_epoch_entry* e) 2367{ 2368 struct cn_msg *cn_reply; 2369 struct drbd_nl_cfg_reply *reply; 2370 unsigned short *tl; 2371 struct page *page; 2372 unsigned len; 2373 2374 if (!e) 2375 return; 2376 if (!reason || !reason[0]) 2377 return; 2378 2379 /* apparently we have to memcpy twice, first to prepare the data for the 2380 * struct cn_msg, then within cn_netlink_send from the cn_msg to the 2381 * netlink skb. */ 2382 /* receiver thread context, which is not in the writeout path (of this node), 2383 * but may be in the writeout path of the _other_ node. 2384 * GFP_NOIO to avoid potential "distributed deadlock". */ 2385 cn_reply = kzalloc( 2386 sizeof(struct cn_msg)+ 2387 sizeof(struct drbd_nl_cfg_reply)+ 2388 sizeof(struct dump_ee_tag_len_struct)+ 2389 sizeof(short int), 2390 GFP_NOIO); 2391 2392 if (!cn_reply) { 2393 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n", 2394 (unsigned long long)e->sector, e->size); 2395 return; 2396 } 2397 2398 reply = (struct drbd_nl_cfg_reply*)cn_reply->data; 2399 tl = reply->tag_list; 2400 2401 tl = tl_add_str(tl, T_dump_ee_reason, reason); 2402 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs); 2403 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs); 2404 tl = tl_add_int(tl, T_ee_sector, &e->sector); 2405 tl = tl_add_int(tl, T_ee_block_id, &e->block_id); 2406 2407 /* dump the first 32k */ 2408 len = min_t(unsigned, e->size, 32 << 10); 2409 put_unaligned(T_ee_data, tl++); 2410 put_unaligned(len, tl++); 2411 2412 page = e->pages; 2413 page_chain_for_each(page) { 2414 void *d = kmap_atomic(page, KM_USER0); 2415 unsigned l = min_t(unsigned, len, PAGE_SIZE); 2416 memcpy(tl, d, l); 2417 kunmap_atomic(d, KM_USER0); 2418 tl = (unsigned short*)((char*)tl + l); 2419 len -= l; 2420 if (len == 0) 2421 break; 2422 } 2423 put_unaligned(TT_END, tl++); /* Close the tag list */ 2424 2425 cn_reply->id.idx = CN_IDX_DRBD; 2426 cn_reply->id.val = CN_VAL_DRBD; 2427 2428 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq); 2429 cn_reply->ack = 0; // not used here. 2430 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2431 (int)((char*)tl - (char*)reply->tag_list); 2432 cn_reply->flags = 0; 2433 2434 reply->packet_type = P_dump_ee; 2435 reply->minor = mdev_to_minor(mdev); 2436 reply->ret_code = NO_ERROR; 2437 2438 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2439 kfree(cn_reply); 2440} 2441 2442void drbd_bcast_sync_progress(struct drbd_conf *mdev) 2443{ 2444 char buffer[sizeof(struct cn_msg)+ 2445 sizeof(struct drbd_nl_cfg_reply)+ 2446 sizeof(struct sync_progress_tag_len_struct)+ 2447 sizeof(short int)]; 2448 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2449 struct drbd_nl_cfg_reply *reply = 2450 (struct drbd_nl_cfg_reply *)cn_reply->data; 2451 unsigned short *tl = reply->tag_list; 2452 unsigned long rs_left; 2453 unsigned int res; 2454 2455 /* no local ref, no bitmap, no syncer progress, no broadcast. */ 2456 if (!get_ldev(mdev)) 2457 return; 2458 drbd_get_syncer_progress(mdev, &rs_left, &res); 2459 put_ldev(mdev); 2460 2461 tl = tl_add_int(tl, T_sync_progress, &res); 2462 put_unaligned(TT_END, tl++); /* Close the tag list */ 2463 2464 cn_reply->id.idx = CN_IDX_DRBD; 2465 cn_reply->id.val = CN_VAL_DRBD; 2466 2467 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2468 cn_reply->ack = 0; /* not used here. */ 2469 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2470 (int)((char *)tl - (char *)reply->tag_list); 2471 cn_reply->flags = 0; 2472 2473 reply->packet_type = P_sync_progress; 2474 reply->minor = mdev_to_minor(mdev); 2475 reply->ret_code = NO_ERROR; 2476 2477 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2478} 2479 2480int __init drbd_nl_init(void) 2481{ 2482 static struct cb_id cn_id_drbd; 2483 int err, try=10; 2484 2485 cn_id_drbd.val = CN_VAL_DRBD; 2486 do { 2487 cn_id_drbd.idx = cn_idx; 2488 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback); 2489 if (!err) 2490 break; 2491 cn_idx = (cn_idx + CN_IDX_STEP); 2492 } while (try--); 2493 2494 if (err) { 2495 printk(KERN_ERR "drbd: cn_drbd failed to register\n"); 2496 return err; 2497 } 2498 2499 return 0; 2500} 2501 2502void drbd_nl_cleanup(void) 2503{ 2504 static struct cb_id cn_id_drbd; 2505 2506 cn_id_drbd.idx = cn_idx; 2507 cn_id_drbd.val = CN_VAL_DRBD; 2508 2509 cn_del_callback(&cn_id_drbd); 2510} 2511 2512void drbd_nl_send_reply(struct cn_msg *req, int ret_code) 2513{ 2514 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)]; 2515 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2516 struct drbd_nl_cfg_reply *reply = 2517 (struct drbd_nl_cfg_reply *)cn_reply->data; 2518 int rr; 2519 2520 memset(buffer, 0, sizeof(buffer)); 2521 cn_reply->id = req->id; 2522 2523 cn_reply->seq = req->seq; 2524 cn_reply->ack = req->ack + 1; 2525 cn_reply->len = sizeof(struct drbd_nl_cfg_reply); 2526 cn_reply->flags = 0; 2527 2528 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor; 2529 reply->ret_code = ret_code; 2530 2531 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2532 if (rr && rr != -ESRCH) 2533 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2534} 2535 2536