drbd_nl.c revision b411b3637fa71fce9cf2acf0639009500f5892fe
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/autoconf.h> 27#include <linux/module.h> 28#include <linux/drbd.h> 29#include <linux/in.h> 30#include <linux/fs.h> 31#include <linux/file.h> 32#include <linux/slab.h> 33#include <linux/connector.h> 34#include <linux/blkpg.h> 35#include <linux/cpumask.h> 36#include "drbd_int.h" 37#include "drbd_tracing.h" 38#include "drbd_wrappers.h" 39#include <asm/unaligned.h> 40#include <linux/drbd_tag_magic.h> 41#include <linux/drbd_limits.h> 42 43static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int); 44static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *); 45static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *); 46 47/* see get_sb_bdev and bd_claim */ 48static char *drbd_m_holder = "Hands off! this is DRBD's meta data device."; 49 50/* Generate the tag_list to struct functions */ 51#define NL_PACKET(name, number, fields) \ 52static int name ## _from_tags(struct drbd_conf *mdev, \ 53 unsigned short *tags, struct name *arg) __attribute__ ((unused)); \ 54static int name ## _from_tags(struct drbd_conf *mdev, \ 55 unsigned short *tags, struct name *arg) \ 56{ \ 57 int tag; \ 58 int dlen; \ 59 \ 60 while ((tag = get_unaligned(tags++)) != TT_END) { \ 61 dlen = get_unaligned(tags++); \ 62 switch (tag_number(tag)) { \ 63 fields \ 64 default: \ 65 if (tag & T_MANDATORY) { \ 66 dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \ 67 return 0; \ 68 } \ 69 } \ 70 tags = (unsigned short *)((char *)tags + dlen); \ 71 } \ 72 return 1; \ 73} 74#define NL_INTEGER(pn, pr, member) \ 75 case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \ 76 arg->member = get_unaligned((int *)(tags)); \ 77 break; 78#define NL_INT64(pn, pr, member) \ 79 case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \ 80 arg->member = get_unaligned((u64 *)(tags)); \ 81 break; 82#define NL_BIT(pn, pr, member) \ 83 case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \ 84 arg->member = *(char *)(tags) ? 1 : 0; \ 85 break; 86#define NL_STRING(pn, pr, member, len) \ 87 case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \ 88 if (dlen > len) { \ 89 dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \ 90 #member, dlen, (unsigned int)len); \ 91 return 0; \ 92 } \ 93 arg->member ## _len = dlen; \ 94 memcpy(arg->member, tags, min_t(size_t, dlen, len)); \ 95 break; 96#include "linux/drbd_nl.h" 97 98/* Generate the struct to tag_list functions */ 99#define NL_PACKET(name, number, fields) \ 100static unsigned short* \ 101name ## _to_tags(struct drbd_conf *mdev, \ 102 struct name *arg, unsigned short *tags) __attribute__ ((unused)); \ 103static unsigned short* \ 104name ## _to_tags(struct drbd_conf *mdev, \ 105 struct name *arg, unsigned short *tags) \ 106{ \ 107 fields \ 108 return tags; \ 109} 110 111#define NL_INTEGER(pn, pr, member) \ 112 put_unaligned(pn | pr | TT_INTEGER, tags++); \ 113 put_unaligned(sizeof(int), tags++); \ 114 put_unaligned(arg->member, (int *)tags); \ 115 tags = (unsigned short *)((char *)tags+sizeof(int)); 116#define NL_INT64(pn, pr, member) \ 117 put_unaligned(pn | pr | TT_INT64, tags++); \ 118 put_unaligned(sizeof(u64), tags++); \ 119 put_unaligned(arg->member, (u64 *)tags); \ 120 tags = (unsigned short *)((char *)tags+sizeof(u64)); 121#define NL_BIT(pn, pr, member) \ 122 put_unaligned(pn | pr | TT_BIT, tags++); \ 123 put_unaligned(sizeof(char), tags++); \ 124 *(char *)tags = arg->member; \ 125 tags = (unsigned short *)((char *)tags+sizeof(char)); 126#define NL_STRING(pn, pr, member, len) \ 127 put_unaligned(pn | pr | TT_STRING, tags++); \ 128 put_unaligned(arg->member ## _len, tags++); \ 129 memcpy(tags, arg->member, arg->member ## _len); \ 130 tags = (unsigned short *)((char *)tags + arg->member ## _len); 131#include "linux/drbd_nl.h" 132 133void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name); 134void drbd_nl_send_reply(struct cn_msg *, int); 135 136int drbd_khelper(struct drbd_conf *mdev, char *cmd) 137{ 138 char *envp[] = { "HOME=/", 139 "TERM=linux", 140 "PATH=/sbin:/usr/sbin:/bin:/usr/bin", 141 NULL, /* Will be set to address family */ 142 NULL, /* Will be set to address */ 143 NULL }; 144 145 char mb[12], af[20], ad[60], *afs; 146 char *argv[] = {usermode_helper, cmd, mb, NULL }; 147 int ret; 148 149 snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev)); 150 151 if (get_net_conf(mdev)) { 152 switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) { 153 case AF_INET6: 154 afs = "ipv6"; 155 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6", 156 &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr); 157 break; 158 case AF_INET: 159 afs = "ipv4"; 160 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4", 161 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr); 162 break; 163 default: 164 afs = "ssocks"; 165 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4", 166 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr); 167 } 168 snprintf(af, 20, "DRBD_PEER_AF=%s", afs); 169 envp[3]=af; 170 envp[4]=ad; 171 put_net_conf(mdev); 172 } 173 174 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb); 175 176 drbd_bcast_ev_helper(mdev, cmd); 177 ret = call_usermodehelper(usermode_helper, argv, envp, 1); 178 if (ret) 179 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n", 180 usermode_helper, cmd, mb, 181 (ret >> 8) & 0xff, ret); 182 else 183 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n", 184 usermode_helper, cmd, mb, 185 (ret >> 8) & 0xff, ret); 186 187 if (ret < 0) /* Ignore any ERRNOs we got. */ 188 ret = 0; 189 190 return ret; 191} 192 193enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev) 194{ 195 char *ex_to_string; 196 int r; 197 enum drbd_disk_state nps; 198 enum drbd_fencing_p fp; 199 200 D_ASSERT(mdev->state.pdsk == D_UNKNOWN); 201 202 if (get_ldev_if_state(mdev, D_CONSISTENT)) { 203 fp = mdev->ldev->dc.fencing; 204 put_ldev(mdev); 205 } else { 206 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n"); 207 return mdev->state.pdsk; 208 } 209 210 if (fp == FP_STONITH) 211 _drbd_request_state(mdev, NS(susp, 1), CS_WAIT_COMPLETE); 212 213 r = drbd_khelper(mdev, "fence-peer"); 214 215 switch ((r>>8) & 0xff) { 216 case 3: /* peer is inconsistent */ 217 ex_to_string = "peer is inconsistent or worse"; 218 nps = D_INCONSISTENT; 219 break; 220 case 4: /* peer got outdated, or was already outdated */ 221 ex_to_string = "peer was fenced"; 222 nps = D_OUTDATED; 223 break; 224 case 5: /* peer was down */ 225 if (mdev->state.disk == D_UP_TO_DATE) { 226 /* we will(have) create(d) a new UUID anyways... */ 227 ex_to_string = "peer is unreachable, assumed to be dead"; 228 nps = D_OUTDATED; 229 } else { 230 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate"; 231 nps = mdev->state.pdsk; 232 } 233 break; 234 case 6: /* Peer is primary, voluntarily outdate myself. 235 * This is useful when an unconnected R_SECONDARY is asked to 236 * become R_PRIMARY, but finds the other peer being active. */ 237 ex_to_string = "peer is active"; 238 dev_warn(DEV, "Peer is primary, outdating myself.\n"); 239 nps = D_UNKNOWN; 240 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE); 241 break; 242 case 7: 243 if (fp != FP_STONITH) 244 dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n"); 245 ex_to_string = "peer was stonithed"; 246 nps = D_OUTDATED; 247 break; 248 default: 249 /* The script is broken ... */ 250 nps = D_UNKNOWN; 251 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff); 252 return nps; 253 } 254 255 dev_info(DEV, "fence-peer helper returned %d (%s)\n", 256 (r>>8) & 0xff, ex_to_string); 257 return nps; 258} 259 260 261int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force) 262{ 263 const int max_tries = 4; 264 int r = 0; 265 int try = 0; 266 int forced = 0; 267 union drbd_state mask, val; 268 enum drbd_disk_state nps; 269 270 if (new_role == R_PRIMARY) 271 request_ping(mdev); /* Detect a dead peer ASAP */ 272 273 mutex_lock(&mdev->state_mutex); 274 275 mask.i = 0; mask.role = R_MASK; 276 val.i = 0; val.role = new_role; 277 278 while (try++ < max_tries) { 279 r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE); 280 281 /* in case we first succeeded to outdate, 282 * but now suddenly could establish a connection */ 283 if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) { 284 val.pdsk = 0; 285 mask.pdsk = 0; 286 continue; 287 } 288 289 if (r == SS_NO_UP_TO_DATE_DISK && force && 290 (mdev->state.disk == D_INCONSISTENT || 291 mdev->state.disk == D_OUTDATED)) { 292 mask.disk = D_MASK; 293 val.disk = D_UP_TO_DATE; 294 forced = 1; 295 continue; 296 } 297 298 if (r == SS_NO_UP_TO_DATE_DISK && 299 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) { 300 D_ASSERT(mdev->state.pdsk == D_UNKNOWN); 301 nps = drbd_try_outdate_peer(mdev); 302 303 if (nps == D_OUTDATED || nps == D_INCONSISTENT) { 304 val.disk = D_UP_TO_DATE; 305 mask.disk = D_MASK; 306 } 307 308 val.pdsk = nps; 309 mask.pdsk = D_MASK; 310 311 continue; 312 } 313 314 if (r == SS_NOTHING_TO_DO) 315 goto fail; 316 if (r == SS_PRIMARY_NOP && mask.pdsk == 0) { 317 nps = drbd_try_outdate_peer(mdev); 318 319 if (force && nps > D_OUTDATED) { 320 dev_warn(DEV, "Forced into split brain situation!\n"); 321 nps = D_OUTDATED; 322 } 323 324 mask.pdsk = D_MASK; 325 val.pdsk = nps; 326 327 continue; 328 } 329 if (r == SS_TWO_PRIMARIES) { 330 /* Maybe the peer is detected as dead very soon... 331 retry at most once more in this case. */ 332 __set_current_state(TASK_INTERRUPTIBLE); 333 schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10); 334 if (try < max_tries) 335 try = max_tries - 1; 336 continue; 337 } 338 if (r < SS_SUCCESS) { 339 r = _drbd_request_state(mdev, mask, val, 340 CS_VERBOSE + CS_WAIT_COMPLETE); 341 if (r < SS_SUCCESS) 342 goto fail; 343 } 344 break; 345 } 346 347 if (r < SS_SUCCESS) 348 goto fail; 349 350 if (forced) 351 dev_warn(DEV, "Forced to consider local data as UpToDate!\n"); 352 353 /* Wait until nothing is on the fly :) */ 354 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0); 355 356 if (new_role == R_SECONDARY) { 357 set_disk_ro(mdev->vdisk, TRUE); 358 if (get_ldev(mdev)) { 359 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; 360 put_ldev(mdev); 361 } 362 } else { 363 if (get_net_conf(mdev)) { 364 mdev->net_conf->want_lose = 0; 365 put_net_conf(mdev); 366 } 367 set_disk_ro(mdev->vdisk, FALSE); 368 if (get_ldev(mdev)) { 369 if (((mdev->state.conn < C_CONNECTED || 370 mdev->state.pdsk <= D_FAILED) 371 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced) 372 drbd_uuid_new_current(mdev); 373 374 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1; 375 put_ldev(mdev); 376 } 377 } 378 379 if ((new_role == R_SECONDARY) && get_ldev(mdev)) { 380 drbd_al_to_on_disk_bm(mdev); 381 put_ldev(mdev); 382 } 383 384 if (mdev->state.conn >= C_WF_REPORT_PARAMS) { 385 /* if this was forced, we should consider sync */ 386 if (forced) 387 drbd_send_uuids(mdev); 388 drbd_send_state(mdev); 389 } 390 391 drbd_md_sync(mdev); 392 393 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 394 fail: 395 mutex_unlock(&mdev->state_mutex); 396 return r; 397} 398 399 400static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 401 struct drbd_nl_cfg_reply *reply) 402{ 403 struct primary primary_args; 404 405 memset(&primary_args, 0, sizeof(struct primary)); 406 if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) { 407 reply->ret_code = ERR_MANDATORY_TAG; 408 return 0; 409 } 410 411 reply->ret_code = 412 drbd_set_role(mdev, R_PRIMARY, primary_args.overwrite_peer); 413 414 return 0; 415} 416 417static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 418 struct drbd_nl_cfg_reply *reply) 419{ 420 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0); 421 422 return 0; 423} 424 425/* initializes the md.*_offset members, so we are able to find 426 * the on disk meta data */ 427static void drbd_md_set_sector_offsets(struct drbd_conf *mdev, 428 struct drbd_backing_dev *bdev) 429{ 430 sector_t md_size_sect = 0; 431 switch (bdev->dc.meta_dev_idx) { 432 default: 433 /* v07 style fixed size indexed meta data */ 434 bdev->md.md_size_sect = MD_RESERVED_SECT; 435 bdev->md.md_offset = drbd_md_ss__(mdev, bdev); 436 bdev->md.al_offset = MD_AL_OFFSET; 437 bdev->md.bm_offset = MD_BM_OFFSET; 438 break; 439 case DRBD_MD_INDEX_FLEX_EXT: 440 /* just occupy the full device; unit: sectors */ 441 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev); 442 bdev->md.md_offset = 0; 443 bdev->md.al_offset = MD_AL_OFFSET; 444 bdev->md.bm_offset = MD_BM_OFFSET; 445 break; 446 case DRBD_MD_INDEX_INTERNAL: 447 case DRBD_MD_INDEX_FLEX_INT: 448 bdev->md.md_offset = drbd_md_ss__(mdev, bdev); 449 /* al size is still fixed */ 450 bdev->md.al_offset = -MD_AL_MAX_SIZE; 451 /* we need (slightly less than) ~ this much bitmap sectors: */ 452 md_size_sect = drbd_get_capacity(bdev->backing_bdev); 453 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT); 454 md_size_sect = BM_SECT_TO_EXT(md_size_sect); 455 md_size_sect = ALIGN(md_size_sect, 8); 456 457 /* plus the "drbd meta data super block", 458 * and the activity log; */ 459 md_size_sect += MD_BM_OFFSET; 460 461 bdev->md.md_size_sect = md_size_sect; 462 /* bitmap offset is adjusted by 'super' block size */ 463 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET; 464 break; 465 } 466} 467 468char *ppsize(char *buf, unsigned long long size) 469{ 470 /* Needs 9 bytes at max. */ 471 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' }; 472 int base = 0; 473 while (size >= 10000) { 474 /* shift + round */ 475 size = (size >> 10) + !!(size & (1<<9)); 476 base++; 477 } 478 sprintf(buf, "%lu %cB", (long)size, units[base]); 479 480 return buf; 481} 482 483/* there is still a theoretical deadlock when called from receiver 484 * on an D_INCONSISTENT R_PRIMARY: 485 * remote READ does inc_ap_bio, receiver would need to receive answer 486 * packet from remote to dec_ap_bio again. 487 * receiver receive_sizes(), comes here, 488 * waits for ap_bio_cnt == 0. -> deadlock. 489 * but this cannot happen, actually, because: 490 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable 491 * (not connected, or bad/no disk on peer): 492 * see drbd_fail_request_early, ap_bio_cnt is zero. 493 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET: 494 * peer may not initiate a resize. 495 */ 496void drbd_suspend_io(struct drbd_conf *mdev) 497{ 498 set_bit(SUSPEND_IO, &mdev->flags); 499 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); 500} 501 502void drbd_resume_io(struct drbd_conf *mdev) 503{ 504 clear_bit(SUSPEND_IO, &mdev->flags); 505 wake_up(&mdev->misc_wait); 506} 507 508/** 509 * drbd_determine_dev_size() - Sets the right device size obeying all constraints 510 * @mdev: DRBD device. 511 * 512 * Returns 0 on success, negative return values indicate errors. 513 * You should call drbd_md_sync() after calling this function. 514 */ 515enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev) __must_hold(local) 516{ 517 sector_t prev_first_sect, prev_size; /* previous meta location */ 518 sector_t la_size; 519 sector_t size; 520 char ppb[10]; 521 522 int md_moved, la_size_changed; 523 enum determine_dev_size rv = unchanged; 524 525 /* race: 526 * application request passes inc_ap_bio, 527 * but then cannot get an AL-reference. 528 * this function later may wait on ap_bio_cnt == 0. -> deadlock. 529 * 530 * to avoid that: 531 * Suspend IO right here. 532 * still lock the act_log to not trigger ASSERTs there. 533 */ 534 drbd_suspend_io(mdev); 535 536 /* no wait necessary anymore, actually we could assert that */ 537 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); 538 539 prev_first_sect = drbd_md_first_sector(mdev->ldev); 540 prev_size = mdev->ldev->md.md_size_sect; 541 la_size = mdev->ldev->md.la_size_sect; 542 543 /* TODO: should only be some assert here, not (re)init... */ 544 drbd_md_set_sector_offsets(mdev, mdev->ldev); 545 546 size = drbd_new_dev_size(mdev, mdev->ldev); 547 548 if (drbd_get_capacity(mdev->this_bdev) != size || 549 drbd_bm_capacity(mdev) != size) { 550 int err; 551 err = drbd_bm_resize(mdev, size); 552 if (unlikely(err)) { 553 /* currently there is only one error: ENOMEM! */ 554 size = drbd_bm_capacity(mdev)>>1; 555 if (size == 0) { 556 dev_err(DEV, "OUT OF MEMORY! " 557 "Could not allocate bitmap!\n"); 558 } else { 559 dev_err(DEV, "BM resizing failed. " 560 "Leaving size unchanged at size = %lu KB\n", 561 (unsigned long)size); 562 } 563 rv = dev_size_error; 564 } 565 /* racy, see comments above. */ 566 drbd_set_my_capacity(mdev, size); 567 mdev->ldev->md.la_size_sect = size; 568 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1), 569 (unsigned long long)size>>1); 570 } 571 if (rv == dev_size_error) 572 goto out; 573 574 la_size_changed = (la_size != mdev->ldev->md.la_size_sect); 575 576 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev) 577 || prev_size != mdev->ldev->md.md_size_sect; 578 579 if (la_size_changed || md_moved) { 580 drbd_al_shrink(mdev); /* All extents inactive. */ 581 dev_info(DEV, "Writing the whole bitmap, %s\n", 582 la_size_changed && md_moved ? "size changed and md moved" : 583 la_size_changed ? "size changed" : "md moved"); 584 rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */ 585 drbd_md_mark_dirty(mdev); 586 } 587 588 if (size > la_size) 589 rv = grew; 590 if (size < la_size) 591 rv = shrunk; 592out: 593 lc_unlock(mdev->act_log); 594 wake_up(&mdev->al_wait); 595 drbd_resume_io(mdev); 596 597 return rv; 598} 599 600sector_t 601drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) 602{ 603 sector_t p_size = mdev->p_size; /* partner's disk size. */ 604 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */ 605 sector_t m_size; /* my size */ 606 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */ 607 sector_t size = 0; 608 609 m_size = drbd_get_max_capacity(bdev); 610 611 if (p_size && m_size) { 612 size = min_t(sector_t, p_size, m_size); 613 } else { 614 if (la_size) { 615 size = la_size; 616 if (m_size && m_size < size) 617 size = m_size; 618 if (p_size && p_size < size) 619 size = p_size; 620 } else { 621 if (m_size) 622 size = m_size; 623 if (p_size) 624 size = p_size; 625 } 626 } 627 628 if (size == 0) 629 dev_err(DEV, "Both nodes diskless!\n"); 630 631 if (u_size) { 632 if (u_size > size) 633 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n", 634 (unsigned long)u_size>>1, (unsigned long)size>>1); 635 else 636 size = u_size; 637 } 638 639 return size; 640} 641 642/** 643 * drbd_check_al_size() - Ensures that the AL is of the right size 644 * @mdev: DRBD device. 645 * 646 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation 647 * failed, and 0 on success. You should call drbd_md_sync() after you called 648 * this function. 649 */ 650static int drbd_check_al_size(struct drbd_conf *mdev) 651{ 652 struct lru_cache *n, *t; 653 struct lc_element *e; 654 unsigned int in_use; 655 int i; 656 657 ERR_IF(mdev->sync_conf.al_extents < 7) 658 mdev->sync_conf.al_extents = 127; 659 660 if (mdev->act_log && 661 mdev->act_log->nr_elements == mdev->sync_conf.al_extents) 662 return 0; 663 664 in_use = 0; 665 t = mdev->act_log; 666 n = lc_create("act_log", drbd_al_ext_cache, 667 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0); 668 669 if (n == NULL) { 670 dev_err(DEV, "Cannot allocate act_log lru!\n"); 671 return -ENOMEM; 672 } 673 spin_lock_irq(&mdev->al_lock); 674 if (t) { 675 for (i = 0; i < t->nr_elements; i++) { 676 e = lc_element_by_index(t, i); 677 if (e->refcnt) 678 dev_err(DEV, "refcnt(%d)==%d\n", 679 e->lc_number, e->refcnt); 680 in_use += e->refcnt; 681 } 682 } 683 if (!in_use) 684 mdev->act_log = n; 685 spin_unlock_irq(&mdev->al_lock); 686 if (in_use) { 687 dev_err(DEV, "Activity log still in use!\n"); 688 lc_destroy(n); 689 return -EBUSY; 690 } else { 691 if (t) 692 lc_destroy(t); 693 } 694 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */ 695 return 0; 696} 697 698void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local) 699{ 700 struct request_queue * const q = mdev->rq_queue; 701 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue; 702 int max_segments = mdev->ldev->dc.max_bio_bvecs; 703 704 if (b->merge_bvec_fn && !mdev->ldev->dc.use_bmbv) 705 max_seg_s = PAGE_SIZE; 706 707 max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s); 708 709 blk_queue_max_sectors(q, max_seg_s >> 9); 710 blk_queue_max_phys_segments(q, max_segments ? max_segments : MAX_PHYS_SEGMENTS); 711 blk_queue_max_hw_segments(q, max_segments ? max_segments : MAX_HW_SEGMENTS); 712 blk_queue_max_segment_size(q, max_seg_s); 713 blk_queue_logical_block_size(q, 512); 714 blk_queue_segment_boundary(q, PAGE_SIZE-1); 715 blk_stack_limits(&q->limits, &b->limits, 0); 716 717 if (b->merge_bvec_fn) 718 dev_warn(DEV, "Backing device's merge_bvec_fn() = %p\n", 719 b->merge_bvec_fn); 720 dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q)); 721 722 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) { 723 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n", 724 q->backing_dev_info.ra_pages, 725 b->backing_dev_info.ra_pages); 726 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages; 727 } 728} 729 730/* serialize deconfig (worker exiting, doing cleanup) 731 * and reconfig (drbdsetup disk, drbdsetup net) 732 * 733 * wait for a potentially exiting worker, then restart it, 734 * or start a new one. 735 */ 736static void drbd_reconfig_start(struct drbd_conf *mdev) 737{ 738 wait_event(mdev->state_wait, test_and_set_bit(CONFIG_PENDING, &mdev->flags)); 739 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags)); 740 drbd_thread_start(&mdev->worker); 741} 742 743/* if still unconfigured, stops worker again. 744 * if configured now, clears CONFIG_PENDING. 745 * wakes potential waiters */ 746static void drbd_reconfig_done(struct drbd_conf *mdev) 747{ 748 spin_lock_irq(&mdev->req_lock); 749 if (mdev->state.disk == D_DISKLESS && 750 mdev->state.conn == C_STANDALONE && 751 mdev->state.role == R_SECONDARY) { 752 set_bit(DEVICE_DYING, &mdev->flags); 753 drbd_thread_stop_nowait(&mdev->worker); 754 } else 755 clear_bit(CONFIG_PENDING, &mdev->flags); 756 spin_unlock_irq(&mdev->req_lock); 757 wake_up(&mdev->state_wait); 758} 759 760/* does always return 0; 761 * interesting return code is in reply->ret_code */ 762static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 763 struct drbd_nl_cfg_reply *reply) 764{ 765 enum drbd_ret_codes retcode; 766 enum determine_dev_size dd; 767 sector_t max_possible_sectors; 768 sector_t min_md_device_sectors; 769 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */ 770 struct inode *inode, *inode2; 771 struct lru_cache *resync_lru = NULL; 772 union drbd_state ns, os; 773 int rv; 774 int cp_discovered = 0; 775 int logical_block_size; 776 777 drbd_reconfig_start(mdev); 778 779 /* if you want to reconfigure, please tear down first */ 780 if (mdev->state.disk > D_DISKLESS) { 781 retcode = ERR_DISK_CONFIGURED; 782 goto fail; 783 } 784 785 /* allocation not in the IO path, cqueue thread context */ 786 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL); 787 if (!nbc) { 788 retcode = ERR_NOMEM; 789 goto fail; 790 } 791 792 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF; 793 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF; 794 nbc->dc.fencing = DRBD_FENCING_DEF; 795 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF; 796 797 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) { 798 retcode = ERR_MANDATORY_TAG; 799 goto fail; 800 } 801 802 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) { 803 retcode = ERR_MD_IDX_INVALID; 804 goto fail; 805 } 806 807 nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0); 808 if (IS_ERR(nbc->lo_file)) { 809 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev, 810 PTR_ERR(nbc->lo_file)); 811 nbc->lo_file = NULL; 812 retcode = ERR_OPEN_DISK; 813 goto fail; 814 } 815 816 inode = nbc->lo_file->f_dentry->d_inode; 817 818 if (!S_ISBLK(inode->i_mode)) { 819 retcode = ERR_DISK_NOT_BDEV; 820 goto fail; 821 } 822 823 nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0); 824 if (IS_ERR(nbc->md_file)) { 825 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev, 826 PTR_ERR(nbc->md_file)); 827 nbc->md_file = NULL; 828 retcode = ERR_OPEN_MD_DISK; 829 goto fail; 830 } 831 832 inode2 = nbc->md_file->f_dentry->d_inode; 833 834 if (!S_ISBLK(inode2->i_mode)) { 835 retcode = ERR_MD_NOT_BDEV; 836 goto fail; 837 } 838 839 nbc->backing_bdev = inode->i_bdev; 840 if (bd_claim(nbc->backing_bdev, mdev)) { 841 printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n", 842 nbc->backing_bdev, mdev, 843 nbc->backing_bdev->bd_holder, 844 nbc->backing_bdev->bd_contains->bd_holder, 845 nbc->backing_bdev->bd_holders); 846 retcode = ERR_BDCLAIM_DISK; 847 goto fail; 848 } 849 850 resync_lru = lc_create("resync", drbd_bm_ext_cache, 851 61, sizeof(struct bm_extent), 852 offsetof(struct bm_extent, lce)); 853 if (!resync_lru) { 854 retcode = ERR_NOMEM; 855 goto release_bdev_fail; 856 } 857 858 /* meta_dev_idx >= 0: external fixed size, 859 * possibly multiple drbd sharing one meta device. 860 * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is 861 * not yet used by some other drbd minor! 862 * (if you use drbd.conf + drbdadm, 863 * that should check it for you already; but if you don't, or someone 864 * fooled it, we need to double check here) */ 865 nbc->md_bdev = inode2->i_bdev; 866 if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev 867 : (void *) drbd_m_holder)) { 868 retcode = ERR_BDCLAIM_MD_DISK; 869 goto release_bdev_fail; 870 } 871 872 if ((nbc->backing_bdev == nbc->md_bdev) != 873 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL || 874 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) { 875 retcode = ERR_MD_IDX_INVALID; 876 goto release_bdev2_fail; 877 } 878 879 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */ 880 drbd_md_set_sector_offsets(mdev, nbc); 881 882 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) { 883 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n", 884 (unsigned long long) drbd_get_max_capacity(nbc), 885 (unsigned long long) nbc->dc.disk_size); 886 retcode = ERR_DISK_TO_SMALL; 887 goto release_bdev2_fail; 888 } 889 890 if (nbc->dc.meta_dev_idx < 0) { 891 max_possible_sectors = DRBD_MAX_SECTORS_FLEX; 892 /* at least one MB, otherwise it does not make sense */ 893 min_md_device_sectors = (2<<10); 894 } else { 895 max_possible_sectors = DRBD_MAX_SECTORS; 896 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1); 897 } 898 899 if (drbd_get_capacity(nbc->md_bdev) > max_possible_sectors) 900 dev_warn(DEV, "truncating very big lower level device " 901 "to currently maximum possible %llu sectors\n", 902 (unsigned long long) max_possible_sectors); 903 904 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) { 905 retcode = ERR_MD_DISK_TO_SMALL; 906 dev_warn(DEV, "refusing attach: md-device too small, " 907 "at least %llu sectors needed for this meta-disk type\n", 908 (unsigned long long) min_md_device_sectors); 909 goto release_bdev2_fail; 910 } 911 912 /* Make sure the new disk is big enough 913 * (we may currently be R_PRIMARY with no local disk...) */ 914 if (drbd_get_max_capacity(nbc) < 915 drbd_get_capacity(mdev->this_bdev)) { 916 retcode = ERR_DISK_TO_SMALL; 917 goto release_bdev2_fail; 918 } 919 920 nbc->known_size = drbd_get_capacity(nbc->backing_bdev); 921 922 drbd_suspend_io(mdev); 923 /* also wait for the last barrier ack. */ 924 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt)); 925 /* and for any other previously queued work */ 926 drbd_flush_workqueue(mdev); 927 928 retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE); 929 drbd_resume_io(mdev); 930 if (retcode < SS_SUCCESS) 931 goto release_bdev2_fail; 932 933 if (!get_ldev_if_state(mdev, D_ATTACHING)) 934 goto force_diskless; 935 936 drbd_md_set_sector_offsets(mdev, nbc); 937 938 if (!mdev->bitmap) { 939 if (drbd_bm_init(mdev)) { 940 retcode = ERR_NOMEM; 941 goto force_diskless_dec; 942 } 943 } 944 945 retcode = drbd_md_read(mdev, nbc); 946 if (retcode != NO_ERROR) 947 goto force_diskless_dec; 948 949 if (mdev->state.conn < C_CONNECTED && 950 mdev->state.role == R_PRIMARY && 951 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) { 952 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n", 953 (unsigned long long)mdev->ed_uuid); 954 retcode = ERR_DATA_NOT_CURRENT; 955 goto force_diskless_dec; 956 } 957 958 /* Since we are diskless, fix the activity log first... */ 959 if (drbd_check_al_size(mdev)) { 960 retcode = ERR_NOMEM; 961 goto force_diskless_dec; 962 } 963 964 /* Prevent shrinking of consistent devices ! */ 965 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) && 966 drbd_new_dev_size(mdev, nbc) < nbc->md.la_size_sect) { 967 dev_warn(DEV, "refusing to truncate a consistent device\n"); 968 retcode = ERR_DISK_TO_SMALL; 969 goto force_diskless_dec; 970 } 971 972 if (!drbd_al_read_log(mdev, nbc)) { 973 retcode = ERR_IO_MD_DISK; 974 goto force_diskless_dec; 975 } 976 977 /* allocate a second IO page if logical_block_size != 512 */ 978 logical_block_size = bdev_logical_block_size(nbc->md_bdev); 979 if (logical_block_size == 0) 980 logical_block_size = MD_SECTOR_SIZE; 981 982 if (logical_block_size != MD_SECTOR_SIZE) { 983 if (!mdev->md_io_tmpp) { 984 struct page *page = alloc_page(GFP_NOIO); 985 if (!page) 986 goto force_diskless_dec; 987 988 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n", 989 logical_block_size, MD_SECTOR_SIZE); 990 dev_warn(DEV, "Workaround engaged (has performance impact).\n"); 991 992 mdev->md_io_tmpp = page; 993 } 994 } 995 996 /* Reset the "barriers don't work" bits here, then force meta data to 997 * be written, to ensure we determine if barriers are supported. */ 998 if (nbc->dc.no_md_flush) 999 set_bit(MD_NO_BARRIER, &mdev->flags); 1000 else 1001 clear_bit(MD_NO_BARRIER, &mdev->flags); 1002 1003 /* Point of no return reached. 1004 * Devices and memory are no longer released by error cleanup below. 1005 * now mdev takes over responsibility, and the state engine should 1006 * clean it up somewhere. */ 1007 D_ASSERT(mdev->ldev == NULL); 1008 mdev->ldev = nbc; 1009 mdev->resync = resync_lru; 1010 nbc = NULL; 1011 resync_lru = NULL; 1012 1013 mdev->write_ordering = WO_bio_barrier; 1014 drbd_bump_write_ordering(mdev, WO_bio_barrier); 1015 1016 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY)) 1017 set_bit(CRASHED_PRIMARY, &mdev->flags); 1018 else 1019 clear_bit(CRASHED_PRIMARY, &mdev->flags); 1020 1021 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND)) { 1022 set_bit(CRASHED_PRIMARY, &mdev->flags); 1023 cp_discovered = 1; 1024 } 1025 1026 mdev->send_cnt = 0; 1027 mdev->recv_cnt = 0; 1028 mdev->read_cnt = 0; 1029 mdev->writ_cnt = 0; 1030 1031 drbd_setup_queue_param(mdev, DRBD_MAX_SEGMENT_SIZE); 1032 1033 /* If I am currently not R_PRIMARY, 1034 * but meta data primary indicator is set, 1035 * I just now recover from a hard crash, 1036 * and have been R_PRIMARY before that crash. 1037 * 1038 * Now, if I had no connection before that crash 1039 * (have been degraded R_PRIMARY), chances are that 1040 * I won't find my peer now either. 1041 * 1042 * In that case, and _only_ in that case, 1043 * we use the degr-wfc-timeout instead of the default, 1044 * so we can automatically recover from a crash of a 1045 * degraded but active "cluster" after a certain timeout. 1046 */ 1047 clear_bit(USE_DEGR_WFC_T, &mdev->flags); 1048 if (mdev->state.role != R_PRIMARY && 1049 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && 1050 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND)) 1051 set_bit(USE_DEGR_WFC_T, &mdev->flags); 1052 1053 dd = drbd_determin_dev_size(mdev); 1054 if (dd == dev_size_error) { 1055 retcode = ERR_NOMEM_BITMAP; 1056 goto force_diskless_dec; 1057 } else if (dd == grew) 1058 set_bit(RESYNC_AFTER_NEG, &mdev->flags); 1059 1060 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { 1061 dev_info(DEV, "Assuming that all blocks are out of sync " 1062 "(aka FullSync)\n"); 1063 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) { 1064 retcode = ERR_IO_MD_DISK; 1065 goto force_diskless_dec; 1066 } 1067 } else { 1068 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) { 1069 retcode = ERR_IO_MD_DISK; 1070 goto force_diskless_dec; 1071 } 1072 } 1073 1074 if (cp_discovered) { 1075 drbd_al_apply_to_bm(mdev); 1076 drbd_al_to_on_disk_bm(mdev); 1077 } 1078 1079 spin_lock_irq(&mdev->req_lock); 1080 os = mdev->state; 1081 ns.i = os.i; 1082 /* If MDF_CONSISTENT is not set go into inconsistent state, 1083 otherwise investigate MDF_WasUpToDate... 1084 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state, 1085 otherwise into D_CONSISTENT state. 1086 */ 1087 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) { 1088 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE)) 1089 ns.disk = D_CONSISTENT; 1090 else 1091 ns.disk = D_OUTDATED; 1092 } else { 1093 ns.disk = D_INCONSISTENT; 1094 } 1095 1096 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED)) 1097 ns.pdsk = D_OUTDATED; 1098 1099 if ( ns.disk == D_CONSISTENT && 1100 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE)) 1101 ns.disk = D_UP_TO_DATE; 1102 1103 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND, 1104 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before 1105 this point, because drbd_request_state() modifies these 1106 flags. */ 1107 1108 /* In case we are C_CONNECTED postpone any decision on the new disk 1109 state after the negotiation phase. */ 1110 if (mdev->state.conn == C_CONNECTED) { 1111 mdev->new_state_tmp.i = ns.i; 1112 ns.i = os.i; 1113 ns.disk = D_NEGOTIATING; 1114 } 1115 1116 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 1117 ns = mdev->state; 1118 spin_unlock_irq(&mdev->req_lock); 1119 1120 if (rv < SS_SUCCESS) 1121 goto force_diskless_dec; 1122 1123 if (mdev->state.role == R_PRIMARY) 1124 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1; 1125 else 1126 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; 1127 1128 drbd_md_mark_dirty(mdev); 1129 drbd_md_sync(mdev); 1130 1131 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1132 put_ldev(mdev); 1133 reply->ret_code = retcode; 1134 drbd_reconfig_done(mdev); 1135 return 0; 1136 1137 force_diskless_dec: 1138 put_ldev(mdev); 1139 force_diskless: 1140 drbd_force_state(mdev, NS(disk, D_DISKLESS)); 1141 drbd_md_sync(mdev); 1142 release_bdev2_fail: 1143 if (nbc) 1144 bd_release(nbc->md_bdev); 1145 release_bdev_fail: 1146 if (nbc) 1147 bd_release(nbc->backing_bdev); 1148 fail: 1149 if (nbc) { 1150 if (nbc->lo_file) 1151 fput(nbc->lo_file); 1152 if (nbc->md_file) 1153 fput(nbc->md_file); 1154 kfree(nbc); 1155 } 1156 lc_destroy(resync_lru); 1157 1158 reply->ret_code = retcode; 1159 drbd_reconfig_done(mdev); 1160 return 0; 1161} 1162 1163static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1164 struct drbd_nl_cfg_reply *reply) 1165{ 1166 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS)); 1167 return 0; 1168} 1169 1170static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1171 struct drbd_nl_cfg_reply *reply) 1172{ 1173 int i, ns; 1174 enum drbd_ret_codes retcode; 1175 struct net_conf *new_conf = NULL; 1176 struct crypto_hash *tfm = NULL; 1177 struct crypto_hash *integrity_w_tfm = NULL; 1178 struct crypto_hash *integrity_r_tfm = NULL; 1179 struct hlist_head *new_tl_hash = NULL; 1180 struct hlist_head *new_ee_hash = NULL; 1181 struct drbd_conf *odev; 1182 char hmac_name[CRYPTO_MAX_ALG_NAME]; 1183 void *int_dig_out = NULL; 1184 void *int_dig_in = NULL; 1185 void *int_dig_vv = NULL; 1186 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr; 1187 1188 drbd_reconfig_start(mdev); 1189 1190 if (mdev->state.conn > C_STANDALONE) { 1191 retcode = ERR_NET_CONFIGURED; 1192 goto fail; 1193 } 1194 1195 /* allocation not in the IO path, cqueue thread context */ 1196 new_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); 1197 if (!new_conf) { 1198 retcode = ERR_NOMEM; 1199 goto fail; 1200 } 1201 1202 memset(new_conf, 0, sizeof(struct net_conf)); 1203 new_conf->timeout = DRBD_TIMEOUT_DEF; 1204 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF; 1205 new_conf->ping_int = DRBD_PING_INT_DEF; 1206 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF; 1207 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF; 1208 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF; 1209 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF; 1210 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF; 1211 new_conf->ko_count = DRBD_KO_COUNT_DEF; 1212 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF; 1213 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF; 1214 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF; 1215 new_conf->want_lose = 0; 1216 new_conf->two_primaries = 0; 1217 new_conf->wire_protocol = DRBD_PROT_C; 1218 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF; 1219 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF; 1220 1221 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) { 1222 retcode = ERR_MANDATORY_TAG; 1223 goto fail; 1224 } 1225 1226 if (new_conf->two_primaries 1227 && (new_conf->wire_protocol != DRBD_PROT_C)) { 1228 retcode = ERR_NOT_PROTO_C; 1229 goto fail; 1230 }; 1231 1232 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) { 1233 retcode = ERR_DISCARD; 1234 goto fail; 1235 } 1236 1237 retcode = NO_ERROR; 1238 1239 new_my_addr = (struct sockaddr *)&new_conf->my_addr; 1240 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr; 1241 for (i = 0; i < minor_count; i++) { 1242 odev = minor_to_mdev(i); 1243 if (!odev || odev == mdev) 1244 continue; 1245 if (get_net_conf(odev)) { 1246 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr; 1247 if (new_conf->my_addr_len == odev->net_conf->my_addr_len && 1248 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len)) 1249 retcode = ERR_LOCAL_ADDR; 1250 1251 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr; 1252 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len && 1253 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len)) 1254 retcode = ERR_PEER_ADDR; 1255 1256 put_net_conf(odev); 1257 if (retcode != NO_ERROR) 1258 goto fail; 1259 } 1260 } 1261 1262 if (new_conf->cram_hmac_alg[0] != 0) { 1263 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", 1264 new_conf->cram_hmac_alg); 1265 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC); 1266 if (IS_ERR(tfm)) { 1267 tfm = NULL; 1268 retcode = ERR_AUTH_ALG; 1269 goto fail; 1270 } 1271 1272 if (crypto_tfm_alg_type(crypto_hash_tfm(tfm)) 1273 != CRYPTO_ALG_TYPE_HASH) { 1274 retcode = ERR_AUTH_ALG_ND; 1275 goto fail; 1276 } 1277 } 1278 1279 if (new_conf->integrity_alg[0]) { 1280 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1281 if (IS_ERR(integrity_w_tfm)) { 1282 integrity_w_tfm = NULL; 1283 retcode=ERR_INTEGRITY_ALG; 1284 goto fail; 1285 } 1286 1287 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) { 1288 retcode=ERR_INTEGRITY_ALG_ND; 1289 goto fail; 1290 } 1291 1292 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1293 if (IS_ERR(integrity_r_tfm)) { 1294 integrity_r_tfm = NULL; 1295 retcode=ERR_INTEGRITY_ALG; 1296 goto fail; 1297 } 1298 } 1299 1300 ns = new_conf->max_epoch_size/8; 1301 if (mdev->tl_hash_s != ns) { 1302 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1303 if (!new_tl_hash) { 1304 retcode = ERR_NOMEM; 1305 goto fail; 1306 } 1307 } 1308 1309 ns = new_conf->max_buffers/8; 1310 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) { 1311 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1312 if (!new_ee_hash) { 1313 retcode = ERR_NOMEM; 1314 goto fail; 1315 } 1316 } 1317 1318 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0; 1319 1320 if (integrity_w_tfm) { 1321 i = crypto_hash_digestsize(integrity_w_tfm); 1322 int_dig_out = kmalloc(i, GFP_KERNEL); 1323 if (!int_dig_out) { 1324 retcode = ERR_NOMEM; 1325 goto fail; 1326 } 1327 int_dig_in = kmalloc(i, GFP_KERNEL); 1328 if (!int_dig_in) { 1329 retcode = ERR_NOMEM; 1330 goto fail; 1331 } 1332 int_dig_vv = kmalloc(i, GFP_KERNEL); 1333 if (!int_dig_vv) { 1334 retcode = ERR_NOMEM; 1335 goto fail; 1336 } 1337 } 1338 1339 if (!mdev->bitmap) { 1340 if(drbd_bm_init(mdev)) { 1341 retcode = ERR_NOMEM; 1342 goto fail; 1343 } 1344 } 1345 1346 spin_lock_irq(&mdev->req_lock); 1347 if (mdev->net_conf != NULL) { 1348 retcode = ERR_NET_CONFIGURED; 1349 spin_unlock_irq(&mdev->req_lock); 1350 goto fail; 1351 } 1352 mdev->net_conf = new_conf; 1353 1354 mdev->send_cnt = 0; 1355 mdev->recv_cnt = 0; 1356 1357 if (new_tl_hash) { 1358 kfree(mdev->tl_hash); 1359 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8; 1360 mdev->tl_hash = new_tl_hash; 1361 } 1362 1363 if (new_ee_hash) { 1364 kfree(mdev->ee_hash); 1365 mdev->ee_hash_s = mdev->net_conf->max_buffers/8; 1366 mdev->ee_hash = new_ee_hash; 1367 } 1368 1369 crypto_free_hash(mdev->cram_hmac_tfm); 1370 mdev->cram_hmac_tfm = tfm; 1371 1372 crypto_free_hash(mdev->integrity_w_tfm); 1373 mdev->integrity_w_tfm = integrity_w_tfm; 1374 1375 crypto_free_hash(mdev->integrity_r_tfm); 1376 mdev->integrity_r_tfm = integrity_r_tfm; 1377 1378 kfree(mdev->int_dig_out); 1379 kfree(mdev->int_dig_in); 1380 kfree(mdev->int_dig_vv); 1381 mdev->int_dig_out=int_dig_out; 1382 mdev->int_dig_in=int_dig_in; 1383 mdev->int_dig_vv=int_dig_vv; 1384 spin_unlock_irq(&mdev->req_lock); 1385 1386 retcode = _drbd_request_state(mdev, NS(conn, C_UNCONNECTED), CS_VERBOSE); 1387 1388 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1389 reply->ret_code = retcode; 1390 drbd_reconfig_done(mdev); 1391 return 0; 1392 1393fail: 1394 kfree(int_dig_out); 1395 kfree(int_dig_in); 1396 kfree(int_dig_vv); 1397 crypto_free_hash(tfm); 1398 crypto_free_hash(integrity_w_tfm); 1399 crypto_free_hash(integrity_r_tfm); 1400 kfree(new_tl_hash); 1401 kfree(new_ee_hash); 1402 kfree(new_conf); 1403 1404 reply->ret_code = retcode; 1405 drbd_reconfig_done(mdev); 1406 return 0; 1407} 1408 1409static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1410 struct drbd_nl_cfg_reply *reply) 1411{ 1412 int retcode; 1413 1414 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED); 1415 1416 if (retcode == SS_NOTHING_TO_DO) 1417 goto done; 1418 else if (retcode == SS_ALREADY_STANDALONE) 1419 goto done; 1420 else if (retcode == SS_PRIMARY_NOP) { 1421 /* Our statche checking code wants to see the peer outdated. */ 1422 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1423 pdsk, D_OUTDATED)); 1424 } else if (retcode == SS_CW_FAILED_BY_PEER) { 1425 /* The peer probably wants to see us outdated. */ 1426 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1427 disk, D_OUTDATED), 1428 CS_ORDERED); 1429 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) { 1430 drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 1431 retcode = SS_SUCCESS; 1432 } 1433 } 1434 1435 if (retcode < SS_SUCCESS) 1436 goto fail; 1437 1438 if (wait_event_interruptible(mdev->state_wait, 1439 mdev->state.conn != C_DISCONNECTING)) { 1440 /* Do not test for mdev->state.conn == C_STANDALONE, since 1441 someone else might connect us in the mean time! */ 1442 retcode = ERR_INTR; 1443 goto fail; 1444 } 1445 1446 done: 1447 retcode = NO_ERROR; 1448 fail: 1449 drbd_md_sync(mdev); 1450 reply->ret_code = retcode; 1451 return 0; 1452} 1453 1454void resync_after_online_grow(struct drbd_conf *mdev) 1455{ 1456 int iass; /* I am sync source */ 1457 1458 dev_info(DEV, "Resync of new storage after online grow\n"); 1459 if (mdev->state.role != mdev->state.peer) 1460 iass = (mdev->state.role == R_PRIMARY); 1461 else 1462 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1463 1464 if (iass) 1465 drbd_start_resync(mdev, C_SYNC_SOURCE); 1466 else 1467 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE); 1468} 1469 1470static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1471 struct drbd_nl_cfg_reply *reply) 1472{ 1473 struct resize rs; 1474 int retcode = NO_ERROR; 1475 int ldsc = 0; /* local disk size changed */ 1476 enum determine_dev_size dd; 1477 1478 memset(&rs, 0, sizeof(struct resize)); 1479 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) { 1480 retcode = ERR_MANDATORY_TAG; 1481 goto fail; 1482 } 1483 1484 if (mdev->state.conn > C_CONNECTED) { 1485 retcode = ERR_RESIZE_RESYNC; 1486 goto fail; 1487 } 1488 1489 if (mdev->state.role == R_SECONDARY && 1490 mdev->state.peer == R_SECONDARY) { 1491 retcode = ERR_NO_PRIMARY; 1492 goto fail; 1493 } 1494 1495 if (!get_ldev(mdev)) { 1496 retcode = ERR_NO_DISK; 1497 goto fail; 1498 } 1499 1500 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 1501 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 1502 ldsc = 1; 1503 } 1504 1505 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size; 1506 dd = drbd_determin_dev_size(mdev); 1507 drbd_md_sync(mdev); 1508 put_ldev(mdev); 1509 if (dd == dev_size_error) { 1510 retcode = ERR_NOMEM_BITMAP; 1511 goto fail; 1512 } 1513 1514 if (mdev->state.conn == C_CONNECTED && (dd != unchanged || ldsc)) { 1515 if (dd == grew) 1516 set_bit(RESIZE_PENDING, &mdev->flags); 1517 1518 drbd_send_uuids(mdev); 1519 drbd_send_sizes(mdev, 1); 1520 } 1521 1522 fail: 1523 reply->ret_code = retcode; 1524 return 0; 1525} 1526 1527static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1528 struct drbd_nl_cfg_reply *reply) 1529{ 1530 int retcode = NO_ERROR; 1531 int err; 1532 int ovr; /* online verify running */ 1533 int rsr; /* re-sync running */ 1534 struct crypto_hash *verify_tfm = NULL; 1535 struct crypto_hash *csums_tfm = NULL; 1536 struct syncer_conf sc; 1537 cpumask_var_t new_cpu_mask; 1538 1539 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) { 1540 retcode = ERR_NOMEM; 1541 goto fail; 1542 } 1543 1544 if (nlp->flags & DRBD_NL_SET_DEFAULTS) { 1545 memset(&sc, 0, sizeof(struct syncer_conf)); 1546 sc.rate = DRBD_RATE_DEF; 1547 sc.after = DRBD_AFTER_DEF; 1548 sc.al_extents = DRBD_AL_EXTENTS_DEF; 1549 } else 1550 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf)); 1551 1552 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) { 1553 retcode = ERR_MANDATORY_TAG; 1554 goto fail; 1555 } 1556 1557 /* re-sync running */ 1558 rsr = ( mdev->state.conn == C_SYNC_SOURCE || 1559 mdev->state.conn == C_SYNC_TARGET || 1560 mdev->state.conn == C_PAUSED_SYNC_S || 1561 mdev->state.conn == C_PAUSED_SYNC_T ); 1562 1563 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) { 1564 retcode = ERR_CSUMS_RESYNC_RUNNING; 1565 goto fail; 1566 } 1567 1568 if (!rsr && sc.csums_alg[0]) { 1569 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC); 1570 if (IS_ERR(csums_tfm)) { 1571 csums_tfm = NULL; 1572 retcode = ERR_CSUMS_ALG; 1573 goto fail; 1574 } 1575 1576 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) { 1577 retcode = ERR_CSUMS_ALG_ND; 1578 goto fail; 1579 } 1580 } 1581 1582 /* online verify running */ 1583 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T); 1584 1585 if (ovr) { 1586 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) { 1587 retcode = ERR_VERIFY_RUNNING; 1588 goto fail; 1589 } 1590 } 1591 1592 if (!ovr && sc.verify_alg[0]) { 1593 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC); 1594 if (IS_ERR(verify_tfm)) { 1595 verify_tfm = NULL; 1596 retcode = ERR_VERIFY_ALG; 1597 goto fail; 1598 } 1599 1600 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) { 1601 retcode = ERR_VERIFY_ALG_ND; 1602 goto fail; 1603 } 1604 } 1605 1606 /* silently ignore cpu mask on UP kernel */ 1607 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) { 1608 err = __bitmap_parse(sc.cpu_mask, 32, 0, 1609 cpumask_bits(new_cpu_mask), nr_cpu_ids); 1610 if (err) { 1611 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err); 1612 retcode = ERR_CPU_MASK_PARSE; 1613 goto fail; 1614 } 1615 } 1616 1617 ERR_IF (sc.rate < 1) sc.rate = 1; 1618 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */ 1619#define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT) 1620 if (sc.al_extents > AL_MAX) { 1621 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX); 1622 sc.al_extents = AL_MAX; 1623 } 1624#undef AL_MAX 1625 1626 /* most sanity checks done, try to assign the new sync-after 1627 * dependency. need to hold the global lock in there, 1628 * to avoid a race in the dependency loop check. */ 1629 retcode = drbd_alter_sa(mdev, sc.after); 1630 if (retcode != NO_ERROR) 1631 goto fail; 1632 1633 /* ok, assign the rest of it as well. 1634 * lock against receive_SyncParam() */ 1635 spin_lock(&mdev->peer_seq_lock); 1636 mdev->sync_conf = sc; 1637 1638 if (!rsr) { 1639 crypto_free_hash(mdev->csums_tfm); 1640 mdev->csums_tfm = csums_tfm; 1641 csums_tfm = NULL; 1642 } 1643 1644 if (!ovr) { 1645 crypto_free_hash(mdev->verify_tfm); 1646 mdev->verify_tfm = verify_tfm; 1647 verify_tfm = NULL; 1648 } 1649 spin_unlock(&mdev->peer_seq_lock); 1650 1651 if (get_ldev(mdev)) { 1652 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); 1653 drbd_al_shrink(mdev); 1654 err = drbd_check_al_size(mdev); 1655 lc_unlock(mdev->act_log); 1656 wake_up(&mdev->al_wait); 1657 1658 put_ldev(mdev); 1659 drbd_md_sync(mdev); 1660 1661 if (err) { 1662 retcode = ERR_NOMEM; 1663 goto fail; 1664 } 1665 } 1666 1667 if (mdev->state.conn >= C_CONNECTED) 1668 drbd_send_sync_param(mdev, &sc); 1669 1670 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) { 1671 cpumask_copy(mdev->cpu_mask, new_cpu_mask); 1672 drbd_calc_cpu_mask(mdev); 1673 mdev->receiver.reset_cpu_mask = 1; 1674 mdev->asender.reset_cpu_mask = 1; 1675 mdev->worker.reset_cpu_mask = 1; 1676 } 1677 1678 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1679fail: 1680 free_cpumask_var(new_cpu_mask); 1681 crypto_free_hash(csums_tfm); 1682 crypto_free_hash(verify_tfm); 1683 reply->ret_code = retcode; 1684 return 0; 1685} 1686 1687static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1688 struct drbd_nl_cfg_reply *reply) 1689{ 1690 int retcode; 1691 1692 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED); 1693 1694 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION) 1695 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1696 1697 while (retcode == SS_NEED_CONNECTION) { 1698 spin_lock_irq(&mdev->req_lock); 1699 if (mdev->state.conn < C_CONNECTED) 1700 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL); 1701 spin_unlock_irq(&mdev->req_lock); 1702 1703 if (retcode != SS_NEED_CONNECTION) 1704 break; 1705 1706 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1707 } 1708 1709 reply->ret_code = retcode; 1710 return 0; 1711} 1712 1713static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1714 struct drbd_nl_cfg_reply *reply) 1715{ 1716 1717 reply->ret_code = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S)); 1718 1719 return 0; 1720} 1721 1722static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1723 struct drbd_nl_cfg_reply *reply) 1724{ 1725 int retcode = NO_ERROR; 1726 1727 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO) 1728 retcode = ERR_PAUSE_IS_SET; 1729 1730 reply->ret_code = retcode; 1731 return 0; 1732} 1733 1734static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1735 struct drbd_nl_cfg_reply *reply) 1736{ 1737 int retcode = NO_ERROR; 1738 1739 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) 1740 retcode = ERR_PAUSE_IS_CLEAR; 1741 1742 reply->ret_code = retcode; 1743 return 0; 1744} 1745 1746static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1747 struct drbd_nl_cfg_reply *reply) 1748{ 1749 reply->ret_code = drbd_request_state(mdev, NS(susp, 1)); 1750 1751 return 0; 1752} 1753 1754static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1755 struct drbd_nl_cfg_reply *reply) 1756{ 1757 reply->ret_code = drbd_request_state(mdev, NS(susp, 0)); 1758 return 0; 1759} 1760 1761static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1762 struct drbd_nl_cfg_reply *reply) 1763{ 1764 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED)); 1765 return 0; 1766} 1767 1768static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1769 struct drbd_nl_cfg_reply *reply) 1770{ 1771 unsigned short *tl; 1772 1773 tl = reply->tag_list; 1774 1775 if (get_ldev(mdev)) { 1776 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl); 1777 put_ldev(mdev); 1778 } 1779 1780 if (get_net_conf(mdev)) { 1781 tl = net_conf_to_tags(mdev, mdev->net_conf, tl); 1782 put_net_conf(mdev); 1783 } 1784 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl); 1785 1786 put_unaligned(TT_END, tl++); /* Close the tag list */ 1787 1788 return (int)((char *)tl - (char *)reply->tag_list); 1789} 1790 1791static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1792 struct drbd_nl_cfg_reply *reply) 1793{ 1794 unsigned short *tl = reply->tag_list; 1795 union drbd_state s = mdev->state; 1796 unsigned long rs_left; 1797 unsigned int res; 1798 1799 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl); 1800 1801 /* no local ref, no bitmap, no syncer progress. */ 1802 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) { 1803 if (get_ldev(mdev)) { 1804 drbd_get_syncer_progress(mdev, &rs_left, &res); 1805 tl = tl_add_int(tl, T_sync_progress, &res); 1806 put_ldev(mdev); 1807 } 1808 } 1809 put_unaligned(TT_END, tl++); /* Close the tag list */ 1810 1811 return (int)((char *)tl - (char *)reply->tag_list); 1812} 1813 1814static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1815 struct drbd_nl_cfg_reply *reply) 1816{ 1817 unsigned short *tl; 1818 1819 tl = reply->tag_list; 1820 1821 if (get_ldev(mdev)) { 1822 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64)); 1823 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags); 1824 put_ldev(mdev); 1825 } 1826 put_unaligned(TT_END, tl++); /* Close the tag list */ 1827 1828 return (int)((char *)tl - (char *)reply->tag_list); 1829} 1830 1831/** 1832 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use 1833 * @mdev: DRBD device. 1834 * @nlp: Netlink/connector packet from drbdsetup 1835 * @reply: Reply packet for drbdsetup 1836 */ 1837static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1838 struct drbd_nl_cfg_reply *reply) 1839{ 1840 unsigned short *tl; 1841 char rv; 1842 1843 tl = reply->tag_list; 1844 1845 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED : 1846 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT; 1847 1848 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv)); 1849 put_unaligned(TT_END, tl++); /* Close the tag list */ 1850 1851 return (int)((char *)tl - (char *)reply->tag_list); 1852} 1853 1854static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1855 struct drbd_nl_cfg_reply *reply) 1856{ 1857 /* default to resume from last known position, if possible */ 1858 struct start_ov args = 1859 { .start_sector = mdev->ov_start_sector }; 1860 1861 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) { 1862 reply->ret_code = ERR_MANDATORY_TAG; 1863 return 0; 1864 } 1865 /* w_make_ov_request expects position to be aligned */ 1866 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT; 1867 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S)); 1868 return 0; 1869} 1870 1871 1872static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1873 struct drbd_nl_cfg_reply *reply) 1874{ 1875 int retcode = NO_ERROR; 1876 int skip_initial_sync = 0; 1877 int err; 1878 1879 struct new_c_uuid args; 1880 1881 memset(&args, 0, sizeof(struct new_c_uuid)); 1882 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) { 1883 reply->ret_code = ERR_MANDATORY_TAG; 1884 return 0; 1885 } 1886 1887 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */ 1888 1889 if (!get_ldev(mdev)) { 1890 retcode = ERR_NO_DISK; 1891 goto out; 1892 } 1893 1894 /* this is "skip initial sync", assume to be clean */ 1895 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 && 1896 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) { 1897 dev_info(DEV, "Preparing to skip initial sync\n"); 1898 skip_initial_sync = 1; 1899 } else if (mdev->state.conn != C_STANDALONE) { 1900 retcode = ERR_CONNECTED; 1901 goto out_dec; 1902 } 1903 1904 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */ 1905 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */ 1906 1907 if (args.clear_bm) { 1908 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid"); 1909 if (err) { 1910 dev_err(DEV, "Writing bitmap failed with %d\n",err); 1911 retcode = ERR_IO_MD_DISK; 1912 } 1913 if (skip_initial_sync) { 1914 drbd_send_uuids_skip_initial_sync(mdev); 1915 _drbd_uuid_set(mdev, UI_BITMAP, 0); 1916 spin_lock_irq(&mdev->req_lock); 1917 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 1918 CS_VERBOSE, NULL); 1919 spin_unlock_irq(&mdev->req_lock); 1920 } 1921 } 1922 1923 drbd_md_sync(mdev); 1924out_dec: 1925 put_ldev(mdev); 1926out: 1927 mutex_unlock(&mdev->state_mutex); 1928 1929 reply->ret_code = retcode; 1930 return 0; 1931} 1932 1933static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp) 1934{ 1935 struct drbd_conf *mdev; 1936 1937 if (nlp->drbd_minor >= minor_count) 1938 return NULL; 1939 1940 mdev = minor_to_mdev(nlp->drbd_minor); 1941 1942 if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) { 1943 struct gendisk *disk = NULL; 1944 mdev = drbd_new_device(nlp->drbd_minor); 1945 1946 spin_lock_irq(&drbd_pp_lock); 1947 if (minor_table[nlp->drbd_minor] == NULL) { 1948 minor_table[nlp->drbd_minor] = mdev; 1949 disk = mdev->vdisk; 1950 mdev = NULL; 1951 } /* else: we lost the race */ 1952 spin_unlock_irq(&drbd_pp_lock); 1953 1954 if (disk) /* we won the race above */ 1955 /* in case we ever add a drbd_delete_device(), 1956 * don't forget the del_gendisk! */ 1957 add_disk(disk); 1958 else /* we lost the race above */ 1959 drbd_free_mdev(mdev); 1960 1961 mdev = minor_to_mdev(nlp->drbd_minor); 1962 } 1963 1964 return mdev; 1965} 1966 1967struct cn_handler_struct { 1968 int (*function)(struct drbd_conf *, 1969 struct drbd_nl_cfg_req *, 1970 struct drbd_nl_cfg_reply *); 1971 int reply_body_size; 1972}; 1973 1974static struct cn_handler_struct cnd_table[] = { 1975 [ P_primary ] = { &drbd_nl_primary, 0 }, 1976 [ P_secondary ] = { &drbd_nl_secondary, 0 }, 1977 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 }, 1978 [ P_detach ] = { &drbd_nl_detach, 0 }, 1979 [ P_net_conf ] = { &drbd_nl_net_conf, 0 }, 1980 [ P_disconnect ] = { &drbd_nl_disconnect, 0 }, 1981 [ P_resize ] = { &drbd_nl_resize, 0 }, 1982 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 }, 1983 [ P_invalidate ] = { &drbd_nl_invalidate, 0 }, 1984 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 }, 1985 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 }, 1986 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 }, 1987 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 }, 1988 [ P_resume_io ] = { &drbd_nl_resume_io, 0 }, 1989 [ P_outdate ] = { &drbd_nl_outdate, 0 }, 1990 [ P_get_config ] = { &drbd_nl_get_config, 1991 sizeof(struct syncer_conf_tag_len_struct) + 1992 sizeof(struct disk_conf_tag_len_struct) + 1993 sizeof(struct net_conf_tag_len_struct) }, 1994 [ P_get_state ] = { &drbd_nl_get_state, 1995 sizeof(struct get_state_tag_len_struct) + 1996 sizeof(struct sync_progress_tag_len_struct) }, 1997 [ P_get_uuids ] = { &drbd_nl_get_uuids, 1998 sizeof(struct get_uuids_tag_len_struct) }, 1999 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag, 2000 sizeof(struct get_timeout_flag_tag_len_struct)}, 2001 [ P_start_ov ] = { &drbd_nl_start_ov, 0 }, 2002 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 }, 2003}; 2004 2005static void drbd_connector_callback(struct cn_msg *req) 2006{ 2007 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data; 2008 struct cn_handler_struct *cm; 2009 struct cn_msg *cn_reply; 2010 struct drbd_nl_cfg_reply *reply; 2011 struct drbd_conf *mdev; 2012 int retcode, rr; 2013 int reply_size = sizeof(struct cn_msg) 2014 + sizeof(struct drbd_nl_cfg_reply) 2015 + sizeof(short int); 2016 2017 if (!try_module_get(THIS_MODULE)) { 2018 printk(KERN_ERR "drbd: try_module_get() failed!\n"); 2019 return; 2020 } 2021 2022 mdev = ensure_mdev(nlp); 2023 if (!mdev) { 2024 retcode = ERR_MINOR_INVALID; 2025 goto fail; 2026 } 2027 2028 trace_drbd_netlink(req, 1); 2029 2030 if (nlp->packet_type >= P_nl_after_last_packet) { 2031 retcode = ERR_PACKET_NR; 2032 goto fail; 2033 } 2034 2035 cm = cnd_table + nlp->packet_type; 2036 2037 /* This may happen if packet number is 0: */ 2038 if (cm->function == NULL) { 2039 retcode = ERR_PACKET_NR; 2040 goto fail; 2041 } 2042 2043 reply_size += cm->reply_body_size; 2044 2045 /* allocation not in the IO path, cqueue thread context */ 2046 cn_reply = kmalloc(reply_size, GFP_KERNEL); 2047 if (!cn_reply) { 2048 retcode = ERR_NOMEM; 2049 goto fail; 2050 } 2051 reply = (struct drbd_nl_cfg_reply *) cn_reply->data; 2052 2053 reply->packet_type = 2054 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet; 2055 reply->minor = nlp->drbd_minor; 2056 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */ 2057 /* reply->tag_list; might be modified by cm->function. */ 2058 2059 rr = cm->function(mdev, nlp, reply); 2060 2061 cn_reply->id = req->id; 2062 cn_reply->seq = req->seq; 2063 cn_reply->ack = req->ack + 1; 2064 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr; 2065 cn_reply->flags = 0; 2066 2067 trace_drbd_netlink(cn_reply, 0); 2068 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL); 2069 if (rr && rr != -ESRCH) 2070 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2071 2072 kfree(cn_reply); 2073 module_put(THIS_MODULE); 2074 return; 2075 fail: 2076 drbd_nl_send_reply(req, retcode); 2077 module_put(THIS_MODULE); 2078} 2079 2080static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */ 2081 2082static unsigned short * 2083__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, 2084 unsigned short len, int nul_terminated) 2085{ 2086 unsigned short l = tag_descriptions[tag_number(tag)].max_len; 2087 len = (len < l) ? len : l; 2088 put_unaligned(tag, tl++); 2089 put_unaligned(len, tl++); 2090 memcpy(tl, data, len); 2091 tl = (unsigned short*)((char*)tl + len); 2092 if (nul_terminated) 2093 *((char*)tl - 1) = 0; 2094 return tl; 2095} 2096 2097static unsigned short * 2098tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len) 2099{ 2100 return __tl_add_blob(tl, tag, data, len, 0); 2101} 2102 2103static unsigned short * 2104tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str) 2105{ 2106 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0); 2107} 2108 2109static unsigned short * 2110tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val) 2111{ 2112 put_unaligned(tag, tl++); 2113 switch(tag_type(tag)) { 2114 case TT_INTEGER: 2115 put_unaligned(sizeof(int), tl++); 2116 put_unaligned(*(int *)val, (int *)tl); 2117 tl = (unsigned short*)((char*)tl+sizeof(int)); 2118 break; 2119 case TT_INT64: 2120 put_unaligned(sizeof(u64), tl++); 2121 put_unaligned(*(u64 *)val, (u64 *)tl); 2122 tl = (unsigned short*)((char*)tl+sizeof(u64)); 2123 break; 2124 default: 2125 /* someone did something stupid. */ 2126 ; 2127 } 2128 return tl; 2129} 2130 2131void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state) 2132{ 2133 char buffer[sizeof(struct cn_msg)+ 2134 sizeof(struct drbd_nl_cfg_reply)+ 2135 sizeof(struct get_state_tag_len_struct)+ 2136 sizeof(short int)]; 2137 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2138 struct drbd_nl_cfg_reply *reply = 2139 (struct drbd_nl_cfg_reply *)cn_reply->data; 2140 unsigned short *tl = reply->tag_list; 2141 2142 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2143 2144 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl); 2145 2146 put_unaligned(TT_END, tl++); /* Close the tag list */ 2147 2148 cn_reply->id.idx = CN_IDX_DRBD; 2149 cn_reply->id.val = CN_VAL_DRBD; 2150 2151 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2152 cn_reply->ack = 0; /* not used here. */ 2153 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2154 (int)((char *)tl - (char *)reply->tag_list); 2155 cn_reply->flags = 0; 2156 2157 reply->packet_type = P_get_state; 2158 reply->minor = mdev_to_minor(mdev); 2159 reply->ret_code = NO_ERROR; 2160 2161 trace_drbd_netlink(cn_reply, 0); 2162 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2163} 2164 2165void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name) 2166{ 2167 char buffer[sizeof(struct cn_msg)+ 2168 sizeof(struct drbd_nl_cfg_reply)+ 2169 sizeof(struct call_helper_tag_len_struct)+ 2170 sizeof(short int)]; 2171 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2172 struct drbd_nl_cfg_reply *reply = 2173 (struct drbd_nl_cfg_reply *)cn_reply->data; 2174 unsigned short *tl = reply->tag_list; 2175 2176 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2177 2178 tl = tl_add_str(tl, T_helper, helper_name); 2179 put_unaligned(TT_END, tl++); /* Close the tag list */ 2180 2181 cn_reply->id.idx = CN_IDX_DRBD; 2182 cn_reply->id.val = CN_VAL_DRBD; 2183 2184 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2185 cn_reply->ack = 0; /* not used here. */ 2186 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2187 (int)((char *)tl - (char *)reply->tag_list); 2188 cn_reply->flags = 0; 2189 2190 reply->packet_type = P_call_helper; 2191 reply->minor = mdev_to_minor(mdev); 2192 reply->ret_code = NO_ERROR; 2193 2194 trace_drbd_netlink(cn_reply, 0); 2195 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2196} 2197 2198void drbd_bcast_ee(struct drbd_conf *mdev, 2199 const char *reason, const int dgs, 2200 const char* seen_hash, const char* calc_hash, 2201 const struct drbd_epoch_entry* e) 2202{ 2203 struct cn_msg *cn_reply; 2204 struct drbd_nl_cfg_reply *reply; 2205 struct bio_vec *bvec; 2206 unsigned short *tl; 2207 int i; 2208 2209 if (!e) 2210 return; 2211 if (!reason || !reason[0]) 2212 return; 2213 2214 /* apparently we have to memcpy twice, first to prepare the data for the 2215 * struct cn_msg, then within cn_netlink_send from the cn_msg to the 2216 * netlink skb. */ 2217 /* receiver thread context, which is not in the writeout path (of this node), 2218 * but may be in the writeout path of the _other_ node. 2219 * GFP_NOIO to avoid potential "distributed deadlock". */ 2220 cn_reply = kmalloc( 2221 sizeof(struct cn_msg)+ 2222 sizeof(struct drbd_nl_cfg_reply)+ 2223 sizeof(struct dump_ee_tag_len_struct)+ 2224 sizeof(short int), 2225 GFP_NOIO); 2226 2227 if (!cn_reply) { 2228 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n", 2229 (unsigned long long)e->sector, e->size); 2230 return; 2231 } 2232 2233 reply = (struct drbd_nl_cfg_reply*)cn_reply->data; 2234 tl = reply->tag_list; 2235 2236 tl = tl_add_str(tl, T_dump_ee_reason, reason); 2237 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs); 2238 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs); 2239 tl = tl_add_int(tl, T_ee_sector, &e->sector); 2240 tl = tl_add_int(tl, T_ee_block_id, &e->block_id); 2241 2242 put_unaligned(T_ee_data, tl++); 2243 put_unaligned(e->size, tl++); 2244 2245 __bio_for_each_segment(bvec, e->private_bio, i, 0) { 2246 void *d = kmap(bvec->bv_page); 2247 memcpy(tl, d + bvec->bv_offset, bvec->bv_len); 2248 kunmap(bvec->bv_page); 2249 tl=(unsigned short*)((char*)tl + bvec->bv_len); 2250 } 2251 put_unaligned(TT_END, tl++); /* Close the tag list */ 2252 2253 cn_reply->id.idx = CN_IDX_DRBD; 2254 cn_reply->id.val = CN_VAL_DRBD; 2255 2256 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq); 2257 cn_reply->ack = 0; // not used here. 2258 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2259 (int)((char*)tl - (char*)reply->tag_list); 2260 cn_reply->flags = 0; 2261 2262 reply->packet_type = P_dump_ee; 2263 reply->minor = mdev_to_minor(mdev); 2264 reply->ret_code = NO_ERROR; 2265 2266 trace_drbd_netlink(cn_reply, 0); 2267 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2268 kfree(cn_reply); 2269} 2270 2271void drbd_bcast_sync_progress(struct drbd_conf *mdev) 2272{ 2273 char buffer[sizeof(struct cn_msg)+ 2274 sizeof(struct drbd_nl_cfg_reply)+ 2275 sizeof(struct sync_progress_tag_len_struct)+ 2276 sizeof(short int)]; 2277 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2278 struct drbd_nl_cfg_reply *reply = 2279 (struct drbd_nl_cfg_reply *)cn_reply->data; 2280 unsigned short *tl = reply->tag_list; 2281 unsigned long rs_left; 2282 unsigned int res; 2283 2284 /* no local ref, no bitmap, no syncer progress, no broadcast. */ 2285 if (!get_ldev(mdev)) 2286 return; 2287 drbd_get_syncer_progress(mdev, &rs_left, &res); 2288 put_ldev(mdev); 2289 2290 tl = tl_add_int(tl, T_sync_progress, &res); 2291 put_unaligned(TT_END, tl++); /* Close the tag list */ 2292 2293 cn_reply->id.idx = CN_IDX_DRBD; 2294 cn_reply->id.val = CN_VAL_DRBD; 2295 2296 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2297 cn_reply->ack = 0; /* not used here. */ 2298 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2299 (int)((char *)tl - (char *)reply->tag_list); 2300 cn_reply->flags = 0; 2301 2302 reply->packet_type = P_sync_progress; 2303 reply->minor = mdev_to_minor(mdev); 2304 reply->ret_code = NO_ERROR; 2305 2306 trace_drbd_netlink(cn_reply, 0); 2307 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2308} 2309 2310int __init drbd_nl_init(void) 2311{ 2312 static struct cb_id cn_id_drbd; 2313 int err, try=10; 2314 2315 cn_id_drbd.val = CN_VAL_DRBD; 2316 do { 2317 cn_id_drbd.idx = cn_idx; 2318 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback); 2319 if (!err) 2320 break; 2321 cn_idx = (cn_idx + CN_IDX_STEP); 2322 } while (try--); 2323 2324 if (err) { 2325 printk(KERN_ERR "drbd: cn_drbd failed to register\n"); 2326 return err; 2327 } 2328 2329 return 0; 2330} 2331 2332void drbd_nl_cleanup(void) 2333{ 2334 static struct cb_id cn_id_drbd; 2335 2336 cn_id_drbd.idx = cn_idx; 2337 cn_id_drbd.val = CN_VAL_DRBD; 2338 2339 cn_del_callback(&cn_id_drbd); 2340} 2341 2342void drbd_nl_send_reply(struct cn_msg *req, int ret_code) 2343{ 2344 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)]; 2345 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2346 struct drbd_nl_cfg_reply *reply = 2347 (struct drbd_nl_cfg_reply *)cn_reply->data; 2348 int rr; 2349 2350 cn_reply->id = req->id; 2351 2352 cn_reply->seq = req->seq; 2353 cn_reply->ack = req->ack + 1; 2354 cn_reply->len = sizeof(struct drbd_nl_cfg_reply); 2355 cn_reply->flags = 0; 2356 2357 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor; 2358 reply->ret_code = ret_code; 2359 2360 trace_drbd_netlink(cn_reply, 0); 2361 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2362 if (rr && rr != -ESRCH) 2363 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2364} 2365 2366