drbd_nl.c revision 62b0da3a244ac33d25a77861ef1cc0080103f2ff
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 291enum drbd_state_rv 292drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force) 293{ 294 const int max_tries = 4; 295 enum drbd_state_rv rv = SS_UNKNOWN_ERROR; 296 int try = 0; 297 int forced = 0; 298 union drbd_state mask, val; 299 enum drbd_disk_state nps; 300 301 if (new_role == R_PRIMARY) 302 request_ping(mdev); /* Detect a dead peer ASAP */ 303 304 mutex_lock(&mdev->state_mutex); 305 306 mask.i = 0; mask.role = R_MASK; 307 val.i = 0; val.role = new_role; 308 309 while (try++ < max_tries) { 310 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE); 311 312 /* in case we first succeeded to outdate, 313 * but now suddenly could establish a connection */ 314 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) { 315 val.pdsk = 0; 316 mask.pdsk = 0; 317 continue; 318 } 319 320 if (rv == SS_NO_UP_TO_DATE_DISK && force && 321 (mdev->state.disk < D_UP_TO_DATE && 322 mdev->state.disk >= D_INCONSISTENT)) { 323 mask.disk = D_MASK; 324 val.disk = D_UP_TO_DATE; 325 forced = 1; 326 continue; 327 } 328 329 if (rv == SS_NO_UP_TO_DATE_DISK && 330 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) { 331 D_ASSERT(mdev->state.pdsk == D_UNKNOWN); 332 nps = drbd_try_outdate_peer(mdev); 333 334 if (nps == D_OUTDATED || nps == D_INCONSISTENT) { 335 val.disk = D_UP_TO_DATE; 336 mask.disk = D_MASK; 337 } 338 339 val.pdsk = nps; 340 mask.pdsk = D_MASK; 341 342 continue; 343 } 344 345 if (rv == SS_NOTHING_TO_DO) 346 goto fail; 347 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) { 348 nps = drbd_try_outdate_peer(mdev); 349 350 if (force && nps > D_OUTDATED) { 351 dev_warn(DEV, "Forced into split brain situation!\n"); 352 nps = D_OUTDATED; 353 } 354 355 mask.pdsk = D_MASK; 356 val.pdsk = nps; 357 358 continue; 359 } 360 if (rv == SS_TWO_PRIMARIES) { 361 /* Maybe the peer is detected as dead very soon... 362 retry at most once more in this case. */ 363 schedule_timeout_interruptible((mdev->net_conf->ping_timeo+1)*HZ/10); 364 if (try < max_tries) 365 try = max_tries - 1; 366 continue; 367 } 368 if (rv < SS_SUCCESS) { 369 rv = _drbd_request_state(mdev, mask, val, 370 CS_VERBOSE + CS_WAIT_COMPLETE); 371 if (rv < SS_SUCCESS) 372 goto fail; 373 } 374 break; 375 } 376 377 if (rv < 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 /* writeout of activity log covered areas of the bitmap 410 * to stable storage done in after state change already */ 411 412 if (mdev->state.conn >= C_WF_REPORT_PARAMS) { 413 /* if this was forced, we should consider sync */ 414 if (forced) 415 drbd_send_uuids(mdev); 416 drbd_send_state(mdev); 417 } 418 419 drbd_md_sync(mdev); 420 421 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 422 fail: 423 mutex_unlock(&mdev->state_mutex); 424 return rv; 425} 426 427static struct drbd_conf *ensure_mdev(int minor, int create) 428{ 429 struct drbd_conf *mdev; 430 431 if (minor >= minor_count) 432 return NULL; 433 434 mdev = minor_to_mdev(minor); 435 436 if (!mdev && create) { 437 struct gendisk *disk = NULL; 438 mdev = drbd_new_device(minor); 439 440 spin_lock_irq(&drbd_pp_lock); 441 if (minor_table[minor] == NULL) { 442 minor_table[minor] = mdev; 443 disk = mdev->vdisk; 444 mdev = NULL; 445 } /* else: we lost the race */ 446 spin_unlock_irq(&drbd_pp_lock); 447 448 if (disk) /* we won the race above */ 449 /* in case we ever add a drbd_delete_device(), 450 * don't forget the del_gendisk! */ 451 add_disk(disk); 452 else /* we lost the race above */ 453 drbd_free_mdev(mdev); 454 455 mdev = minor_to_mdev(minor); 456 } 457 458 return mdev; 459} 460 461static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 462 struct drbd_nl_cfg_reply *reply) 463{ 464 struct primary primary_args; 465 466 memset(&primary_args, 0, sizeof(struct primary)); 467 if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) { 468 reply->ret_code = ERR_MANDATORY_TAG; 469 return 0; 470 } 471 472 reply->ret_code = 473 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force); 474 475 return 0; 476} 477 478static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 479 struct drbd_nl_cfg_reply *reply) 480{ 481 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0); 482 483 return 0; 484} 485 486/* initializes the md.*_offset members, so we are able to find 487 * the on disk meta data */ 488static void drbd_md_set_sector_offsets(struct drbd_conf *mdev, 489 struct drbd_backing_dev *bdev) 490{ 491 sector_t md_size_sect = 0; 492 switch (bdev->dc.meta_dev_idx) { 493 default: 494 /* v07 style fixed size indexed meta data */ 495 bdev->md.md_size_sect = MD_RESERVED_SECT; 496 bdev->md.md_offset = drbd_md_ss__(mdev, bdev); 497 bdev->md.al_offset = MD_AL_OFFSET; 498 bdev->md.bm_offset = MD_BM_OFFSET; 499 break; 500 case DRBD_MD_INDEX_FLEX_EXT: 501 /* just occupy the full device; unit: sectors */ 502 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev); 503 bdev->md.md_offset = 0; 504 bdev->md.al_offset = MD_AL_OFFSET; 505 bdev->md.bm_offset = MD_BM_OFFSET; 506 break; 507 case DRBD_MD_INDEX_INTERNAL: 508 case DRBD_MD_INDEX_FLEX_INT: 509 bdev->md.md_offset = drbd_md_ss__(mdev, bdev); 510 /* al size is still fixed */ 511 bdev->md.al_offset = -MD_AL_MAX_SIZE; 512 /* we need (slightly less than) ~ this much bitmap sectors: */ 513 md_size_sect = drbd_get_capacity(bdev->backing_bdev); 514 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT); 515 md_size_sect = BM_SECT_TO_EXT(md_size_sect); 516 md_size_sect = ALIGN(md_size_sect, 8); 517 518 /* plus the "drbd meta data super block", 519 * and the activity log; */ 520 md_size_sect += MD_BM_OFFSET; 521 522 bdev->md.md_size_sect = md_size_sect; 523 /* bitmap offset is adjusted by 'super' block size */ 524 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET; 525 break; 526 } 527} 528 529/* input size is expected to be in KB */ 530char *ppsize(char *buf, unsigned long long size) 531{ 532 /* Needs 9 bytes at max including trailing NUL: 533 * -1ULL ==> "16384 EB" */ 534 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' }; 535 int base = 0; 536 while (size >= 10000 && base < sizeof(units)-1) { 537 /* shift + round */ 538 size = (size >> 10) + !!(size & (1<<9)); 539 base++; 540 } 541 sprintf(buf, "%u %cB", (unsigned)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 int err; 646 647 drbd_al_shrink(mdev); /* All extents inactive. */ 648 dev_info(DEV, "Writing the whole bitmap, %s\n", 649 la_size_changed && md_moved ? "size changed and md moved" : 650 la_size_changed ? "size changed" : "md moved"); 651 err = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */ 652 if (err) { 653 rv = dev_size_error; 654 goto out; 655 } 656 drbd_md_mark_dirty(mdev); 657 } 658 659 if (size > la_size) 660 rv = grew; 661 if (size < la_size) 662 rv = shrunk; 663out: 664 lc_unlock(mdev->act_log); 665 wake_up(&mdev->al_wait); 666 drbd_resume_io(mdev); 667 668 return rv; 669} 670 671sector_t 672drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space) 673{ 674 sector_t p_size = mdev->p_size; /* partner's disk size. */ 675 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */ 676 sector_t m_size; /* my size */ 677 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */ 678 sector_t size = 0; 679 680 m_size = drbd_get_max_capacity(bdev); 681 682 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) { 683 dev_warn(DEV, "Resize while not connected was forced by the user!\n"); 684 p_size = m_size; 685 } 686 687 if (p_size && m_size) { 688 size = min_t(sector_t, p_size, m_size); 689 } else { 690 if (la_size) { 691 size = la_size; 692 if (m_size && m_size < size) 693 size = m_size; 694 if (p_size && p_size < size) 695 size = p_size; 696 } else { 697 if (m_size) 698 size = m_size; 699 if (p_size) 700 size = p_size; 701 } 702 } 703 704 if (size == 0) 705 dev_err(DEV, "Both nodes diskless!\n"); 706 707 if (u_size) { 708 if (u_size > size) 709 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n", 710 (unsigned long)u_size>>1, (unsigned long)size>>1); 711 else 712 size = u_size; 713 } 714 715 return size; 716} 717 718/** 719 * drbd_check_al_size() - Ensures that the AL is of the right size 720 * @mdev: DRBD device. 721 * 722 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation 723 * failed, and 0 on success. You should call drbd_md_sync() after you called 724 * this function. 725 */ 726static int drbd_check_al_size(struct drbd_conf *mdev) 727{ 728 struct lru_cache *n, *t; 729 struct lc_element *e; 730 unsigned int in_use; 731 int i; 732 733 ERR_IF(mdev->sync_conf.al_extents < 7) 734 mdev->sync_conf.al_extents = 127; 735 736 if (mdev->act_log && 737 mdev->act_log->nr_elements == mdev->sync_conf.al_extents) 738 return 0; 739 740 in_use = 0; 741 t = mdev->act_log; 742 n = lc_create("act_log", drbd_al_ext_cache, 743 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0); 744 745 if (n == NULL) { 746 dev_err(DEV, "Cannot allocate act_log lru!\n"); 747 return -ENOMEM; 748 } 749 spin_lock_irq(&mdev->al_lock); 750 if (t) { 751 for (i = 0; i < t->nr_elements; i++) { 752 e = lc_element_by_index(t, i); 753 if (e->refcnt) 754 dev_err(DEV, "refcnt(%d)==%d\n", 755 e->lc_number, e->refcnt); 756 in_use += e->refcnt; 757 } 758 } 759 if (!in_use) 760 mdev->act_log = n; 761 spin_unlock_irq(&mdev->al_lock); 762 if (in_use) { 763 dev_err(DEV, "Activity log still in use!\n"); 764 lc_destroy(n); 765 return -EBUSY; 766 } else { 767 if (t) 768 lc_destroy(t); 769 } 770 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */ 771 return 0; 772} 773 774void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size) __must_hold(local) 775{ 776 struct request_queue * const q = mdev->rq_queue; 777 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue; 778 int max_segments = mdev->ldev->dc.max_bio_bvecs; 779 int max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9); 780 781 blk_queue_logical_block_size(q, 512); 782 blk_queue_max_hw_sectors(q, max_hw_sectors); 783 /* This is the workaround for "bio would need to, but cannot, be split" */ 784 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS); 785 blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1); 786 blk_queue_stack_limits(q, b); 787 788 dev_info(DEV, "max BIO size = %u\n", queue_max_hw_sectors(q) << 9); 789 790 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) { 791 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n", 792 q->backing_dev_info.ra_pages, 793 b->backing_dev_info.ra_pages); 794 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages; 795 } 796} 797 798/* serialize deconfig (worker exiting, doing cleanup) 799 * and reconfig (drbdsetup disk, drbdsetup net) 800 * 801 * Wait for a potentially exiting worker, then restart it, 802 * or start a new one. Flush any pending work, there may still be an 803 * after_state_change queued. 804 */ 805static void drbd_reconfig_start(struct drbd_conf *mdev) 806{ 807 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags)); 808 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags)); 809 drbd_thread_start(&mdev->worker); 810 drbd_flush_workqueue(mdev); 811} 812 813/* if still unconfigured, stops worker again. 814 * if configured now, clears CONFIG_PENDING. 815 * wakes potential waiters */ 816static void drbd_reconfig_done(struct drbd_conf *mdev) 817{ 818 spin_lock_irq(&mdev->req_lock); 819 if (mdev->state.disk == D_DISKLESS && 820 mdev->state.conn == C_STANDALONE && 821 mdev->state.role == R_SECONDARY) { 822 set_bit(DEVICE_DYING, &mdev->flags); 823 drbd_thread_stop_nowait(&mdev->worker); 824 } else 825 clear_bit(CONFIG_PENDING, &mdev->flags); 826 spin_unlock_irq(&mdev->req_lock); 827 wake_up(&mdev->state_wait); 828} 829 830/* Make sure IO is suspended before calling this function(). */ 831static void drbd_suspend_al(struct drbd_conf *mdev) 832{ 833 int s = 0; 834 835 if (lc_try_lock(mdev->act_log)) { 836 drbd_al_shrink(mdev); 837 lc_unlock(mdev->act_log); 838 } else { 839 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n"); 840 return; 841 } 842 843 spin_lock_irq(&mdev->req_lock); 844 if (mdev->state.conn < C_CONNECTED) 845 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags); 846 847 spin_unlock_irq(&mdev->req_lock); 848 849 if (s) 850 dev_info(DEV, "Suspended AL updates\n"); 851} 852 853/* does always return 0; 854 * interesting return code is in reply->ret_code */ 855static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 856 struct drbd_nl_cfg_reply *reply) 857{ 858 enum drbd_ret_code retcode; 859 enum determine_dev_size dd; 860 sector_t max_possible_sectors; 861 sector_t min_md_device_sectors; 862 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */ 863 struct block_device *bdev; 864 struct lru_cache *resync_lru = NULL; 865 union drbd_state ns, os; 866 unsigned int max_bio_size; 867 enum drbd_state_rv rv; 868 int cp_discovered = 0; 869 int logical_block_size; 870 871 drbd_reconfig_start(mdev); 872 873 /* if you want to reconfigure, please tear down first */ 874 if (mdev->state.disk > D_DISKLESS) { 875 retcode = ERR_DISK_CONFIGURED; 876 goto fail; 877 } 878 /* It may just now have detached because of IO error. Make sure 879 * drbd_ldev_destroy is done already, we may end up here very fast, 880 * e.g. if someone calls attach from the on-io-error handler, 881 * to realize a "hot spare" feature (not that I'd recommend that) */ 882 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt)); 883 884 /* allocation not in the IO path, cqueue thread context */ 885 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL); 886 if (!nbc) { 887 retcode = ERR_NOMEM; 888 goto fail; 889 } 890 891 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF; 892 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF; 893 nbc->dc.fencing = DRBD_FENCING_DEF; 894 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF; 895 896 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) { 897 retcode = ERR_MANDATORY_TAG; 898 goto fail; 899 } 900 901 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) { 902 retcode = ERR_MD_IDX_INVALID; 903 goto fail; 904 } 905 906 if (get_net_conf(mdev)) { 907 int prot = mdev->net_conf->wire_protocol; 908 put_net_conf(mdev); 909 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) { 910 retcode = ERR_STONITH_AND_PROT_A; 911 goto fail; 912 } 913 } 914 915 bdev = blkdev_get_by_path(nbc->dc.backing_dev, 916 FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev); 917 if (IS_ERR(bdev)) { 918 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev, 919 PTR_ERR(bdev)); 920 retcode = ERR_OPEN_DISK; 921 goto fail; 922 } 923 nbc->backing_bdev = bdev; 924 925 /* 926 * meta_dev_idx >= 0: external fixed size, possibly multiple 927 * drbd sharing one meta device. TODO in that case, paranoia 928 * check that [md_bdev, meta_dev_idx] is not yet used by some 929 * other drbd minor! (if you use drbd.conf + drbdadm, that 930 * should check it for you already; but if you don't, or 931 * someone fooled it, we need to double check here) 932 */ 933 bdev = blkdev_get_by_path(nbc->dc.meta_dev, 934 FMODE_READ | FMODE_WRITE | FMODE_EXCL, 935 (nbc->dc.meta_dev_idx < 0) ? 936 (void *)mdev : (void *)drbd_m_holder); 937 if (IS_ERR(bdev)) { 938 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev, 939 PTR_ERR(bdev)); 940 retcode = ERR_OPEN_MD_DISK; 941 goto fail; 942 } 943 nbc->md_bdev = bdev; 944 945 if ((nbc->backing_bdev == nbc->md_bdev) != 946 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL || 947 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) { 948 retcode = ERR_MD_IDX_INVALID; 949 goto fail; 950 } 951 952 resync_lru = lc_create("resync", drbd_bm_ext_cache, 953 61, sizeof(struct bm_extent), 954 offsetof(struct bm_extent, lce)); 955 if (!resync_lru) { 956 retcode = ERR_NOMEM; 957 goto fail; 958 } 959 960 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */ 961 drbd_md_set_sector_offsets(mdev, nbc); 962 963 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) { 964 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n", 965 (unsigned long long) drbd_get_max_capacity(nbc), 966 (unsigned long long) nbc->dc.disk_size); 967 retcode = ERR_DISK_TO_SMALL; 968 goto fail; 969 } 970 971 if (nbc->dc.meta_dev_idx < 0) { 972 max_possible_sectors = DRBD_MAX_SECTORS_FLEX; 973 /* at least one MB, otherwise it does not make sense */ 974 min_md_device_sectors = (2<<10); 975 } else { 976 max_possible_sectors = DRBD_MAX_SECTORS; 977 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1); 978 } 979 980 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) { 981 retcode = ERR_MD_DISK_TO_SMALL; 982 dev_warn(DEV, "refusing attach: md-device too small, " 983 "at least %llu sectors needed for this meta-disk type\n", 984 (unsigned long long) min_md_device_sectors); 985 goto fail; 986 } 987 988 /* Make sure the new disk is big enough 989 * (we may currently be R_PRIMARY with no local disk...) */ 990 if (drbd_get_max_capacity(nbc) < 991 drbd_get_capacity(mdev->this_bdev)) { 992 retcode = ERR_DISK_TO_SMALL; 993 goto fail; 994 } 995 996 nbc->known_size = drbd_get_capacity(nbc->backing_bdev); 997 998 if (nbc->known_size > max_possible_sectors) { 999 dev_warn(DEV, "==> truncating very big lower level device " 1000 "to currently maximum possible %llu sectors <==\n", 1001 (unsigned long long) max_possible_sectors); 1002 if (nbc->dc.meta_dev_idx >= 0) 1003 dev_warn(DEV, "==>> using internal or flexible " 1004 "meta data may help <<==\n"); 1005 } 1006 1007 drbd_suspend_io(mdev); 1008 /* also wait for the last barrier ack. */ 1009 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state)); 1010 /* and for any other previously queued work */ 1011 drbd_flush_workqueue(mdev); 1012 1013 rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE); 1014 retcode = rv; /* FIXME: Type mismatch. */ 1015 drbd_resume_io(mdev); 1016 if (rv < SS_SUCCESS) 1017 goto fail; 1018 1019 if (!get_ldev_if_state(mdev, D_ATTACHING)) 1020 goto force_diskless; 1021 1022 drbd_md_set_sector_offsets(mdev, nbc); 1023 1024 /* allocate a second IO page if logical_block_size != 512 */ 1025 logical_block_size = bdev_logical_block_size(nbc->md_bdev); 1026 if (logical_block_size == 0) 1027 logical_block_size = MD_SECTOR_SIZE; 1028 1029 if (logical_block_size != MD_SECTOR_SIZE) { 1030 if (!mdev->md_io_tmpp) { 1031 struct page *page = alloc_page(GFP_NOIO); 1032 if (!page) 1033 goto force_diskless_dec; 1034 1035 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n", 1036 logical_block_size, MD_SECTOR_SIZE); 1037 dev_warn(DEV, "Workaround engaged (has performance impact).\n"); 1038 1039 mdev->md_io_tmpp = page; 1040 } 1041 } 1042 1043 if (!mdev->bitmap) { 1044 if (drbd_bm_init(mdev)) { 1045 retcode = ERR_NOMEM; 1046 goto force_diskless_dec; 1047 } 1048 } 1049 1050 retcode = drbd_md_read(mdev, nbc); 1051 if (retcode != NO_ERROR) 1052 goto force_diskless_dec; 1053 1054 if (mdev->state.conn < C_CONNECTED && 1055 mdev->state.role == R_PRIMARY && 1056 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) { 1057 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n", 1058 (unsigned long long)mdev->ed_uuid); 1059 retcode = ERR_DATA_NOT_CURRENT; 1060 goto force_diskless_dec; 1061 } 1062 1063 /* Since we are diskless, fix the activity log first... */ 1064 if (drbd_check_al_size(mdev)) { 1065 retcode = ERR_NOMEM; 1066 goto force_diskless_dec; 1067 } 1068 1069 /* Prevent shrinking of consistent devices ! */ 1070 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) && 1071 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) { 1072 dev_warn(DEV, "refusing to truncate a consistent device\n"); 1073 retcode = ERR_DISK_TO_SMALL; 1074 goto force_diskless_dec; 1075 } 1076 1077 if (!drbd_al_read_log(mdev, nbc)) { 1078 retcode = ERR_IO_MD_DISK; 1079 goto force_diskless_dec; 1080 } 1081 1082 /* Reset the "barriers don't work" bits here, then force meta data to 1083 * be written, to ensure we determine if barriers are supported. */ 1084 if (nbc->dc.no_md_flush) 1085 set_bit(MD_NO_FUA, &mdev->flags); 1086 else 1087 clear_bit(MD_NO_FUA, &mdev->flags); 1088 1089 /* Point of no return reached. 1090 * Devices and memory are no longer released by error cleanup below. 1091 * now mdev takes over responsibility, and the state engine should 1092 * clean it up somewhere. */ 1093 D_ASSERT(mdev->ldev == NULL); 1094 mdev->ldev = nbc; 1095 mdev->resync = resync_lru; 1096 nbc = NULL; 1097 resync_lru = NULL; 1098 1099 mdev->write_ordering = WO_bdev_flush; 1100 drbd_bump_write_ordering(mdev, WO_bdev_flush); 1101 1102 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY)) 1103 set_bit(CRASHED_PRIMARY, &mdev->flags); 1104 else 1105 clear_bit(CRASHED_PRIMARY, &mdev->flags); 1106 1107 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && 1108 !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) { 1109 set_bit(CRASHED_PRIMARY, &mdev->flags); 1110 cp_discovered = 1; 1111 } 1112 1113 mdev->send_cnt = 0; 1114 mdev->recv_cnt = 0; 1115 mdev->read_cnt = 0; 1116 mdev->writ_cnt = 0; 1117 1118 max_bio_size = DRBD_MAX_BIO_SIZE; 1119 if (mdev->state.conn == C_CONNECTED) { 1120 /* We are Primary, Connected, and now attach a new local 1121 * backing store. We must not increase the user visible maximum 1122 * bio size on this device to something the peer may not be 1123 * able to handle. */ 1124 if (mdev->agreed_pro_version < 94) 1125 max_bio_size = queue_max_hw_sectors(mdev->rq_queue) << 9; 1126 else if (mdev->agreed_pro_version == 94) 1127 max_bio_size = DRBD_MAX_SIZE_H80_PACKET; 1128 /* else: drbd 8.3.9 and later, stay with default */ 1129 } 1130 1131 drbd_setup_queue_param(mdev, max_bio_size); 1132 1133 /* If I am currently not R_PRIMARY, 1134 * but meta data primary indicator is set, 1135 * I just now recover from a hard crash, 1136 * and have been R_PRIMARY before that crash. 1137 * 1138 * Now, if I had no connection before that crash 1139 * (have been degraded R_PRIMARY), chances are that 1140 * I won't find my peer now either. 1141 * 1142 * In that case, and _only_ in that case, 1143 * we use the degr-wfc-timeout instead of the default, 1144 * so we can automatically recover from a crash of a 1145 * degraded but active "cluster" after a certain timeout. 1146 */ 1147 clear_bit(USE_DEGR_WFC_T, &mdev->flags); 1148 if (mdev->state.role != R_PRIMARY && 1149 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && 1150 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND)) 1151 set_bit(USE_DEGR_WFC_T, &mdev->flags); 1152 1153 dd = drbd_determin_dev_size(mdev, 0); 1154 if (dd == dev_size_error) { 1155 retcode = ERR_NOMEM_BITMAP; 1156 goto force_diskless_dec; 1157 } else if (dd == grew) 1158 set_bit(RESYNC_AFTER_NEG, &mdev->flags); 1159 1160 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { 1161 dev_info(DEV, "Assuming that all blocks are out of sync " 1162 "(aka FullSync)\n"); 1163 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) { 1164 retcode = ERR_IO_MD_DISK; 1165 goto force_diskless_dec; 1166 } 1167 } else { 1168 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) { 1169 retcode = ERR_IO_MD_DISK; 1170 goto force_diskless_dec; 1171 } 1172 } 1173 1174 if (cp_discovered) { 1175 drbd_al_apply_to_bm(mdev); 1176 if (drbd_bitmap_io(mdev, &drbd_bm_write, "crashed primary apply AL")) { 1177 retcode = ERR_IO_MD_DISK; 1178 goto force_diskless_dec; 1179 } 1180 } 1181 1182 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev)) 1183 drbd_suspend_al(mdev); /* IO is still suspended here... */ 1184 1185 spin_lock_irq(&mdev->req_lock); 1186 os = mdev->state; 1187 ns.i = os.i; 1188 /* If MDF_CONSISTENT is not set go into inconsistent state, 1189 otherwise investigate MDF_WasUpToDate... 1190 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state, 1191 otherwise into D_CONSISTENT state. 1192 */ 1193 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) { 1194 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE)) 1195 ns.disk = D_CONSISTENT; 1196 else 1197 ns.disk = D_OUTDATED; 1198 } else { 1199 ns.disk = D_INCONSISTENT; 1200 } 1201 1202 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED)) 1203 ns.pdsk = D_OUTDATED; 1204 1205 if ( ns.disk == D_CONSISTENT && 1206 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE)) 1207 ns.disk = D_UP_TO_DATE; 1208 1209 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND, 1210 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before 1211 this point, because drbd_request_state() modifies these 1212 flags. */ 1213 1214 /* In case we are C_CONNECTED postpone any decision on the new disk 1215 state after the negotiation phase. */ 1216 if (mdev->state.conn == C_CONNECTED) { 1217 mdev->new_state_tmp.i = ns.i; 1218 ns.i = os.i; 1219 ns.disk = D_NEGOTIATING; 1220 1221 /* We expect to receive up-to-date UUIDs soon. 1222 To avoid a race in receive_state, free p_uuid while 1223 holding req_lock. I.e. atomic with the state change */ 1224 kfree(mdev->p_uuid); 1225 mdev->p_uuid = NULL; 1226 } 1227 1228 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 1229 ns = mdev->state; 1230 spin_unlock_irq(&mdev->req_lock); 1231 1232 if (rv < SS_SUCCESS) 1233 goto force_diskless_dec; 1234 1235 if (mdev->state.role == R_PRIMARY) 1236 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1; 1237 else 1238 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; 1239 1240 drbd_md_mark_dirty(mdev); 1241 drbd_md_sync(mdev); 1242 1243 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1244 put_ldev(mdev); 1245 reply->ret_code = retcode; 1246 drbd_reconfig_done(mdev); 1247 return 0; 1248 1249 force_diskless_dec: 1250 put_ldev(mdev); 1251 force_diskless: 1252 drbd_force_state(mdev, NS(disk, D_FAILED)); 1253 drbd_md_sync(mdev); 1254 fail: 1255 if (nbc) { 1256 if (nbc->backing_bdev) 1257 blkdev_put(nbc->backing_bdev, 1258 FMODE_READ | FMODE_WRITE | FMODE_EXCL); 1259 if (nbc->md_bdev) 1260 blkdev_put(nbc->md_bdev, 1261 FMODE_READ | FMODE_WRITE | FMODE_EXCL); 1262 kfree(nbc); 1263 } 1264 lc_destroy(resync_lru); 1265 1266 reply->ret_code = retcode; 1267 drbd_reconfig_done(mdev); 1268 return 0; 1269} 1270 1271/* Detaching the disk is a process in multiple stages. First we need to lock 1272 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io. 1273 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all 1274 * internal references as well. 1275 * Only then we have finally detached. */ 1276static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1277 struct drbd_nl_cfg_reply *reply) 1278{ 1279 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */ 1280 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS)); 1281 if (mdev->state.disk == D_DISKLESS) 1282 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt)); 1283 drbd_resume_io(mdev); 1284 return 0; 1285} 1286 1287static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1288 struct drbd_nl_cfg_reply *reply) 1289{ 1290 int i, ns; 1291 enum drbd_ret_code retcode; 1292 struct net_conf *new_conf = NULL; 1293 struct crypto_hash *tfm = NULL; 1294 struct crypto_hash *integrity_w_tfm = NULL; 1295 struct crypto_hash *integrity_r_tfm = NULL; 1296 struct hlist_head *new_tl_hash = NULL; 1297 struct hlist_head *new_ee_hash = NULL; 1298 struct drbd_conf *odev; 1299 char hmac_name[CRYPTO_MAX_ALG_NAME]; 1300 void *int_dig_out = NULL; 1301 void *int_dig_in = NULL; 1302 void *int_dig_vv = NULL; 1303 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr; 1304 1305 drbd_reconfig_start(mdev); 1306 1307 if (mdev->state.conn > C_STANDALONE) { 1308 retcode = ERR_NET_CONFIGURED; 1309 goto fail; 1310 } 1311 1312 /* allocation not in the IO path, cqueue thread context */ 1313 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 1314 if (!new_conf) { 1315 retcode = ERR_NOMEM; 1316 goto fail; 1317 } 1318 1319 new_conf->timeout = DRBD_TIMEOUT_DEF; 1320 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF; 1321 new_conf->ping_int = DRBD_PING_INT_DEF; 1322 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF; 1323 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF; 1324 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF; 1325 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF; 1326 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF; 1327 new_conf->ko_count = DRBD_KO_COUNT_DEF; 1328 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF; 1329 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF; 1330 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF; 1331 new_conf->want_lose = 0; 1332 new_conf->two_primaries = 0; 1333 new_conf->wire_protocol = DRBD_PROT_C; 1334 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF; 1335 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF; 1336 new_conf->on_congestion = DRBD_ON_CONGESTION_DEF; 1337 new_conf->cong_extents = DRBD_CONG_EXTENTS_DEF; 1338 1339 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) { 1340 retcode = ERR_MANDATORY_TAG; 1341 goto fail; 1342 } 1343 1344 if (new_conf->two_primaries 1345 && (new_conf->wire_protocol != DRBD_PROT_C)) { 1346 retcode = ERR_NOT_PROTO_C; 1347 goto fail; 1348 } 1349 1350 if (get_ldev(mdev)) { 1351 enum drbd_fencing_p fp = mdev->ldev->dc.fencing; 1352 put_ldev(mdev); 1353 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) { 1354 retcode = ERR_STONITH_AND_PROT_A; 1355 goto fail; 1356 } 1357 } 1358 1359 if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A) { 1360 retcode = ERR_CONG_NOT_PROTO_A; 1361 goto fail; 1362 } 1363 1364 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) { 1365 retcode = ERR_DISCARD; 1366 goto fail; 1367 } 1368 1369 retcode = NO_ERROR; 1370 1371 new_my_addr = (struct sockaddr *)&new_conf->my_addr; 1372 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr; 1373 for (i = 0; i < minor_count; i++) { 1374 odev = minor_to_mdev(i); 1375 if (!odev || odev == mdev) 1376 continue; 1377 if (get_net_conf(odev)) { 1378 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr; 1379 if (new_conf->my_addr_len == odev->net_conf->my_addr_len && 1380 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len)) 1381 retcode = ERR_LOCAL_ADDR; 1382 1383 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr; 1384 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len && 1385 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len)) 1386 retcode = ERR_PEER_ADDR; 1387 1388 put_net_conf(odev); 1389 if (retcode != NO_ERROR) 1390 goto fail; 1391 } 1392 } 1393 1394 if (new_conf->cram_hmac_alg[0] != 0) { 1395 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", 1396 new_conf->cram_hmac_alg); 1397 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC); 1398 if (IS_ERR(tfm)) { 1399 tfm = NULL; 1400 retcode = ERR_AUTH_ALG; 1401 goto fail; 1402 } 1403 1404 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 1405 retcode = ERR_AUTH_ALG_ND; 1406 goto fail; 1407 } 1408 } 1409 1410 if (new_conf->integrity_alg[0]) { 1411 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1412 if (IS_ERR(integrity_w_tfm)) { 1413 integrity_w_tfm = NULL; 1414 retcode=ERR_INTEGRITY_ALG; 1415 goto fail; 1416 } 1417 1418 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) { 1419 retcode=ERR_INTEGRITY_ALG_ND; 1420 goto fail; 1421 } 1422 1423 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1424 if (IS_ERR(integrity_r_tfm)) { 1425 integrity_r_tfm = NULL; 1426 retcode=ERR_INTEGRITY_ALG; 1427 goto fail; 1428 } 1429 } 1430 1431 ns = new_conf->max_epoch_size/8; 1432 if (mdev->tl_hash_s != ns) { 1433 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1434 if (!new_tl_hash) { 1435 retcode = ERR_NOMEM; 1436 goto fail; 1437 } 1438 } 1439 1440 ns = new_conf->max_buffers/8; 1441 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) { 1442 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1443 if (!new_ee_hash) { 1444 retcode = ERR_NOMEM; 1445 goto fail; 1446 } 1447 } 1448 1449 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0; 1450 1451 if (integrity_w_tfm) { 1452 i = crypto_hash_digestsize(integrity_w_tfm); 1453 int_dig_out = kmalloc(i, GFP_KERNEL); 1454 if (!int_dig_out) { 1455 retcode = ERR_NOMEM; 1456 goto fail; 1457 } 1458 int_dig_in = kmalloc(i, GFP_KERNEL); 1459 if (!int_dig_in) { 1460 retcode = ERR_NOMEM; 1461 goto fail; 1462 } 1463 int_dig_vv = kmalloc(i, GFP_KERNEL); 1464 if (!int_dig_vv) { 1465 retcode = ERR_NOMEM; 1466 goto fail; 1467 } 1468 } 1469 1470 if (!mdev->bitmap) { 1471 if(drbd_bm_init(mdev)) { 1472 retcode = ERR_NOMEM; 1473 goto fail; 1474 } 1475 } 1476 1477 drbd_flush_workqueue(mdev); 1478 spin_lock_irq(&mdev->req_lock); 1479 if (mdev->net_conf != NULL) { 1480 retcode = ERR_NET_CONFIGURED; 1481 spin_unlock_irq(&mdev->req_lock); 1482 goto fail; 1483 } 1484 mdev->net_conf = new_conf; 1485 1486 mdev->send_cnt = 0; 1487 mdev->recv_cnt = 0; 1488 1489 if (new_tl_hash) { 1490 kfree(mdev->tl_hash); 1491 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8; 1492 mdev->tl_hash = new_tl_hash; 1493 } 1494 1495 if (new_ee_hash) { 1496 kfree(mdev->ee_hash); 1497 mdev->ee_hash_s = mdev->net_conf->max_buffers/8; 1498 mdev->ee_hash = new_ee_hash; 1499 } 1500 1501 crypto_free_hash(mdev->cram_hmac_tfm); 1502 mdev->cram_hmac_tfm = tfm; 1503 1504 crypto_free_hash(mdev->integrity_w_tfm); 1505 mdev->integrity_w_tfm = integrity_w_tfm; 1506 1507 crypto_free_hash(mdev->integrity_r_tfm); 1508 mdev->integrity_r_tfm = integrity_r_tfm; 1509 1510 kfree(mdev->int_dig_out); 1511 kfree(mdev->int_dig_in); 1512 kfree(mdev->int_dig_vv); 1513 mdev->int_dig_out=int_dig_out; 1514 mdev->int_dig_in=int_dig_in; 1515 mdev->int_dig_vv=int_dig_vv; 1516 retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL); 1517 spin_unlock_irq(&mdev->req_lock); 1518 1519 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1520 reply->ret_code = retcode; 1521 drbd_reconfig_done(mdev); 1522 return 0; 1523 1524fail: 1525 kfree(int_dig_out); 1526 kfree(int_dig_in); 1527 kfree(int_dig_vv); 1528 crypto_free_hash(tfm); 1529 crypto_free_hash(integrity_w_tfm); 1530 crypto_free_hash(integrity_r_tfm); 1531 kfree(new_tl_hash); 1532 kfree(new_ee_hash); 1533 kfree(new_conf); 1534 1535 reply->ret_code = retcode; 1536 drbd_reconfig_done(mdev); 1537 return 0; 1538} 1539 1540static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1541 struct drbd_nl_cfg_reply *reply) 1542{ 1543 int retcode; 1544 struct disconnect dc; 1545 1546 memset(&dc, 0, sizeof(struct disconnect)); 1547 if (!disconnect_from_tags(mdev, nlp->tag_list, &dc)) { 1548 retcode = ERR_MANDATORY_TAG; 1549 goto fail; 1550 } 1551 1552 if (dc.force) { 1553 spin_lock_irq(&mdev->req_lock); 1554 if (mdev->state.conn >= C_WF_CONNECTION) 1555 _drbd_set_state(_NS(mdev, conn, C_DISCONNECTING), CS_HARD, NULL); 1556 spin_unlock_irq(&mdev->req_lock); 1557 goto done; 1558 } 1559 1560 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED); 1561 1562 if (retcode == SS_NOTHING_TO_DO) 1563 goto done; 1564 else if (retcode == SS_ALREADY_STANDALONE) 1565 goto done; 1566 else if (retcode == SS_PRIMARY_NOP) { 1567 /* Our statche checking code wants to see the peer outdated. */ 1568 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1569 pdsk, D_OUTDATED)); 1570 } else if (retcode == SS_CW_FAILED_BY_PEER) { 1571 /* The peer probably wants to see us outdated. */ 1572 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1573 disk, D_OUTDATED), 1574 CS_ORDERED); 1575 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) { 1576 drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 1577 retcode = SS_SUCCESS; 1578 } 1579 } 1580 1581 if (retcode < SS_SUCCESS) 1582 goto fail; 1583 1584 if (wait_event_interruptible(mdev->state_wait, 1585 mdev->state.conn != C_DISCONNECTING)) { 1586 /* Do not test for mdev->state.conn == C_STANDALONE, since 1587 someone else might connect us in the mean time! */ 1588 retcode = ERR_INTR; 1589 goto fail; 1590 } 1591 1592 done: 1593 retcode = NO_ERROR; 1594 fail: 1595 drbd_md_sync(mdev); 1596 reply->ret_code = retcode; 1597 return 0; 1598} 1599 1600void resync_after_online_grow(struct drbd_conf *mdev) 1601{ 1602 int iass; /* I am sync source */ 1603 1604 dev_info(DEV, "Resync of new storage after online grow\n"); 1605 if (mdev->state.role != mdev->state.peer) 1606 iass = (mdev->state.role == R_PRIMARY); 1607 else 1608 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1609 1610 if (iass) 1611 drbd_start_resync(mdev, C_SYNC_SOURCE); 1612 else 1613 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE); 1614} 1615 1616static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1617 struct drbd_nl_cfg_reply *reply) 1618{ 1619 struct resize rs; 1620 int retcode = NO_ERROR; 1621 enum determine_dev_size dd; 1622 enum dds_flags ddsf; 1623 1624 memset(&rs, 0, sizeof(struct resize)); 1625 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) { 1626 retcode = ERR_MANDATORY_TAG; 1627 goto fail; 1628 } 1629 1630 if (mdev->state.conn > C_CONNECTED) { 1631 retcode = ERR_RESIZE_RESYNC; 1632 goto fail; 1633 } 1634 1635 if (mdev->state.role == R_SECONDARY && 1636 mdev->state.peer == R_SECONDARY) { 1637 retcode = ERR_NO_PRIMARY; 1638 goto fail; 1639 } 1640 1641 if (!get_ldev(mdev)) { 1642 retcode = ERR_NO_DISK; 1643 goto fail; 1644 } 1645 1646 if (rs.no_resync && mdev->agreed_pro_version < 93) { 1647 retcode = ERR_NEED_APV_93; 1648 goto fail; 1649 } 1650 1651 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) 1652 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 1653 1654 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size; 1655 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0); 1656 dd = drbd_determin_dev_size(mdev, ddsf); 1657 drbd_md_sync(mdev); 1658 put_ldev(mdev); 1659 if (dd == dev_size_error) { 1660 retcode = ERR_NOMEM_BITMAP; 1661 goto fail; 1662 } 1663 1664 if (mdev->state.conn == C_CONNECTED) { 1665 if (dd == grew) 1666 set_bit(RESIZE_PENDING, &mdev->flags); 1667 1668 drbd_send_uuids(mdev); 1669 drbd_send_sizes(mdev, 1, ddsf); 1670 } 1671 1672 fail: 1673 reply->ret_code = retcode; 1674 return 0; 1675} 1676 1677static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1678 struct drbd_nl_cfg_reply *reply) 1679{ 1680 int retcode = NO_ERROR; 1681 int err; 1682 int ovr; /* online verify running */ 1683 int rsr; /* re-sync running */ 1684 struct crypto_hash *verify_tfm = NULL; 1685 struct crypto_hash *csums_tfm = NULL; 1686 struct syncer_conf sc; 1687 cpumask_var_t new_cpu_mask; 1688 int *rs_plan_s = NULL; 1689 int fifo_size; 1690 1691 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) { 1692 retcode = ERR_NOMEM; 1693 goto fail; 1694 } 1695 1696 if (nlp->flags & DRBD_NL_SET_DEFAULTS) { 1697 memset(&sc, 0, sizeof(struct syncer_conf)); 1698 sc.rate = DRBD_RATE_DEF; 1699 sc.after = DRBD_AFTER_DEF; 1700 sc.al_extents = DRBD_AL_EXTENTS_DEF; 1701 sc.on_no_data = DRBD_ON_NO_DATA_DEF; 1702 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF; 1703 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF; 1704 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF; 1705 sc.c_max_rate = DRBD_C_MAX_RATE_DEF; 1706 sc.c_min_rate = DRBD_C_MIN_RATE_DEF; 1707 } else 1708 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf)); 1709 1710 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) { 1711 retcode = ERR_MANDATORY_TAG; 1712 goto fail; 1713 } 1714 1715 /* re-sync running */ 1716 rsr = ( mdev->state.conn == C_SYNC_SOURCE || 1717 mdev->state.conn == C_SYNC_TARGET || 1718 mdev->state.conn == C_PAUSED_SYNC_S || 1719 mdev->state.conn == C_PAUSED_SYNC_T ); 1720 1721 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) { 1722 retcode = ERR_CSUMS_RESYNC_RUNNING; 1723 goto fail; 1724 } 1725 1726 if (!rsr && sc.csums_alg[0]) { 1727 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC); 1728 if (IS_ERR(csums_tfm)) { 1729 csums_tfm = NULL; 1730 retcode = ERR_CSUMS_ALG; 1731 goto fail; 1732 } 1733 1734 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) { 1735 retcode = ERR_CSUMS_ALG_ND; 1736 goto fail; 1737 } 1738 } 1739 1740 /* online verify running */ 1741 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T); 1742 1743 if (ovr) { 1744 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) { 1745 retcode = ERR_VERIFY_RUNNING; 1746 goto fail; 1747 } 1748 } 1749 1750 if (!ovr && sc.verify_alg[0]) { 1751 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC); 1752 if (IS_ERR(verify_tfm)) { 1753 verify_tfm = NULL; 1754 retcode = ERR_VERIFY_ALG; 1755 goto fail; 1756 } 1757 1758 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) { 1759 retcode = ERR_VERIFY_ALG_ND; 1760 goto fail; 1761 } 1762 } 1763 1764 /* silently ignore cpu mask on UP kernel */ 1765 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) { 1766 err = __bitmap_parse(sc.cpu_mask, 32, 0, 1767 cpumask_bits(new_cpu_mask), nr_cpu_ids); 1768 if (err) { 1769 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err); 1770 retcode = ERR_CPU_MASK_PARSE; 1771 goto fail; 1772 } 1773 } 1774 1775 ERR_IF (sc.rate < 1) sc.rate = 1; 1776 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */ 1777#define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT) 1778 if (sc.al_extents > AL_MAX) { 1779 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX); 1780 sc.al_extents = AL_MAX; 1781 } 1782#undef AL_MAX 1783 1784 /* to avoid spurious errors when configuring minors before configuring 1785 * the minors they depend on: if necessary, first create the minor we 1786 * depend on */ 1787 if (sc.after >= 0) 1788 ensure_mdev(sc.after, 1); 1789 1790 /* most sanity checks done, try to assign the new sync-after 1791 * dependency. need to hold the global lock in there, 1792 * to avoid a race in the dependency loop check. */ 1793 retcode = drbd_alter_sa(mdev, sc.after); 1794 if (retcode != NO_ERROR) 1795 goto fail; 1796 1797 fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 1798 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 1799 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 1800 if (!rs_plan_s) { 1801 dev_err(DEV, "kmalloc of fifo_buffer failed"); 1802 retcode = ERR_NOMEM; 1803 goto fail; 1804 } 1805 } 1806 1807 /* ok, assign the rest of it as well. 1808 * lock against receive_SyncParam() */ 1809 spin_lock(&mdev->peer_seq_lock); 1810 mdev->sync_conf = sc; 1811 1812 if (!rsr) { 1813 crypto_free_hash(mdev->csums_tfm); 1814 mdev->csums_tfm = csums_tfm; 1815 csums_tfm = NULL; 1816 } 1817 1818 if (!ovr) { 1819 crypto_free_hash(mdev->verify_tfm); 1820 mdev->verify_tfm = verify_tfm; 1821 verify_tfm = NULL; 1822 } 1823 1824 if (fifo_size != mdev->rs_plan_s.size) { 1825 kfree(mdev->rs_plan_s.values); 1826 mdev->rs_plan_s.values = rs_plan_s; 1827 mdev->rs_plan_s.size = fifo_size; 1828 mdev->rs_planed = 0; 1829 rs_plan_s = NULL; 1830 } 1831 1832 spin_unlock(&mdev->peer_seq_lock); 1833 1834 if (get_ldev(mdev)) { 1835 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); 1836 drbd_al_shrink(mdev); 1837 err = drbd_check_al_size(mdev); 1838 lc_unlock(mdev->act_log); 1839 wake_up(&mdev->al_wait); 1840 1841 put_ldev(mdev); 1842 drbd_md_sync(mdev); 1843 1844 if (err) { 1845 retcode = ERR_NOMEM; 1846 goto fail; 1847 } 1848 } 1849 1850 if (mdev->state.conn >= C_CONNECTED) 1851 drbd_send_sync_param(mdev, &sc); 1852 1853 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) { 1854 cpumask_copy(mdev->cpu_mask, new_cpu_mask); 1855 drbd_calc_cpu_mask(mdev); 1856 mdev->receiver.reset_cpu_mask = 1; 1857 mdev->asender.reset_cpu_mask = 1; 1858 mdev->worker.reset_cpu_mask = 1; 1859 } 1860 1861 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1862fail: 1863 kfree(rs_plan_s); 1864 free_cpumask_var(new_cpu_mask); 1865 crypto_free_hash(csums_tfm); 1866 crypto_free_hash(verify_tfm); 1867 reply->ret_code = retcode; 1868 return 0; 1869} 1870 1871static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1872 struct drbd_nl_cfg_reply *reply) 1873{ 1874 int retcode; 1875 1876 /* If there is still bitmap IO pending, probably because of a previous 1877 * resync just being finished, wait for it before requesting a new resync. */ 1878 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 1879 1880 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED); 1881 1882 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION) 1883 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1884 1885 while (retcode == SS_NEED_CONNECTION) { 1886 spin_lock_irq(&mdev->req_lock); 1887 if (mdev->state.conn < C_CONNECTED) 1888 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL); 1889 spin_unlock_irq(&mdev->req_lock); 1890 1891 if (retcode != SS_NEED_CONNECTION) 1892 break; 1893 1894 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1895 } 1896 1897 reply->ret_code = retcode; 1898 return 0; 1899} 1900 1901static int drbd_bmio_set_susp_al(struct drbd_conf *mdev) 1902{ 1903 int rv; 1904 1905 rv = drbd_bmio_set_n_write(mdev); 1906 drbd_suspend_al(mdev); 1907 return rv; 1908} 1909 1910static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1911 struct drbd_nl_cfg_reply *reply) 1912{ 1913 int retcode; 1914 1915 /* If there is still bitmap IO pending, probably because of a previous 1916 * resync just being finished, wait for it before requesting a new resync. */ 1917 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 1918 1919 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED); 1920 1921 if (retcode < SS_SUCCESS) { 1922 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) { 1923 /* The peer will get a resync upon connect anyways. Just make that 1924 into a full resync. */ 1925 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT)); 1926 if (retcode >= SS_SUCCESS) { 1927 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al, 1928 "set_n_write from invalidate_peer")) 1929 retcode = ERR_IO_MD_DISK; 1930 } 1931 } else 1932 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S)); 1933 } 1934 1935 reply->ret_code = retcode; 1936 return 0; 1937} 1938 1939static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1940 struct drbd_nl_cfg_reply *reply) 1941{ 1942 int retcode = NO_ERROR; 1943 1944 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO) 1945 retcode = ERR_PAUSE_IS_SET; 1946 1947 reply->ret_code = retcode; 1948 return 0; 1949} 1950 1951static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1952 struct drbd_nl_cfg_reply *reply) 1953{ 1954 int retcode = NO_ERROR; 1955 union drbd_state s; 1956 1957 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) { 1958 s = mdev->state; 1959 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) { 1960 retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP : 1961 s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR; 1962 } else { 1963 retcode = ERR_PAUSE_IS_CLEAR; 1964 } 1965 } 1966 1967 reply->ret_code = retcode; 1968 return 0; 1969} 1970 1971static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1972 struct drbd_nl_cfg_reply *reply) 1973{ 1974 reply->ret_code = drbd_request_state(mdev, NS(susp, 1)); 1975 1976 return 0; 1977} 1978 1979static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1980 struct drbd_nl_cfg_reply *reply) 1981{ 1982 if (test_bit(NEW_CUR_UUID, &mdev->flags)) { 1983 drbd_uuid_new_current(mdev); 1984 clear_bit(NEW_CUR_UUID, &mdev->flags); 1985 } 1986 drbd_suspend_io(mdev); 1987 reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0)); 1988 if (reply->ret_code == SS_SUCCESS) { 1989 if (mdev->state.conn < C_CONNECTED) 1990 tl_clear(mdev); 1991 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED) 1992 tl_restart(mdev, fail_frozen_disk_io); 1993 } 1994 drbd_resume_io(mdev); 1995 1996 return 0; 1997} 1998 1999static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2000 struct drbd_nl_cfg_reply *reply) 2001{ 2002 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED)); 2003 return 0; 2004} 2005 2006static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2007 struct drbd_nl_cfg_reply *reply) 2008{ 2009 unsigned short *tl; 2010 2011 tl = reply->tag_list; 2012 2013 if (get_ldev(mdev)) { 2014 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl); 2015 put_ldev(mdev); 2016 } 2017 2018 if (get_net_conf(mdev)) { 2019 tl = net_conf_to_tags(mdev, mdev->net_conf, tl); 2020 put_net_conf(mdev); 2021 } 2022 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl); 2023 2024 put_unaligned(TT_END, tl++); /* Close the tag list */ 2025 2026 return (int)((char *)tl - (char *)reply->tag_list); 2027} 2028 2029static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2030 struct drbd_nl_cfg_reply *reply) 2031{ 2032 unsigned short *tl = reply->tag_list; 2033 union drbd_state s = mdev->state; 2034 unsigned long rs_left; 2035 unsigned int res; 2036 2037 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl); 2038 2039 /* no local ref, no bitmap, no syncer progress. */ 2040 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) { 2041 if (get_ldev(mdev)) { 2042 drbd_get_syncer_progress(mdev, &rs_left, &res); 2043 tl = tl_add_int(tl, T_sync_progress, &res); 2044 put_ldev(mdev); 2045 } 2046 } 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_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2053 struct drbd_nl_cfg_reply *reply) 2054{ 2055 unsigned short *tl; 2056 2057 tl = reply->tag_list; 2058 2059 if (get_ldev(mdev)) { 2060 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64)); 2061 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags); 2062 put_ldev(mdev); 2063 } 2064 put_unaligned(TT_END, tl++); /* Close the tag list */ 2065 2066 return (int)((char *)tl - (char *)reply->tag_list); 2067} 2068 2069/** 2070 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use 2071 * @mdev: DRBD device. 2072 * @nlp: Netlink/connector packet from drbdsetup 2073 * @reply: Reply packet for drbdsetup 2074 */ 2075static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2076 struct drbd_nl_cfg_reply *reply) 2077{ 2078 unsigned short *tl; 2079 char rv; 2080 2081 tl = reply->tag_list; 2082 2083 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED : 2084 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT; 2085 2086 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv)); 2087 put_unaligned(TT_END, tl++); /* Close the tag list */ 2088 2089 return (int)((char *)tl - (char *)reply->tag_list); 2090} 2091 2092static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2093 struct drbd_nl_cfg_reply *reply) 2094{ 2095 /* default to resume from last known position, if possible */ 2096 struct start_ov args = 2097 { .start_sector = mdev->ov_start_sector }; 2098 2099 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) { 2100 reply->ret_code = ERR_MANDATORY_TAG; 2101 return 0; 2102 } 2103 /* w_make_ov_request expects position to be aligned */ 2104 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT; 2105 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S)); 2106 return 0; 2107} 2108 2109 2110static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2111 struct drbd_nl_cfg_reply *reply) 2112{ 2113 int retcode = NO_ERROR; 2114 int skip_initial_sync = 0; 2115 int err; 2116 2117 struct new_c_uuid args; 2118 2119 memset(&args, 0, sizeof(struct new_c_uuid)); 2120 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) { 2121 reply->ret_code = ERR_MANDATORY_TAG; 2122 return 0; 2123 } 2124 2125 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */ 2126 2127 if (!get_ldev(mdev)) { 2128 retcode = ERR_NO_DISK; 2129 goto out; 2130 } 2131 2132 /* this is "skip initial sync", assume to be clean */ 2133 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 && 2134 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) { 2135 dev_info(DEV, "Preparing to skip initial sync\n"); 2136 skip_initial_sync = 1; 2137 } else if (mdev->state.conn != C_STANDALONE) { 2138 retcode = ERR_CONNECTED; 2139 goto out_dec; 2140 } 2141 2142 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */ 2143 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */ 2144 2145 if (args.clear_bm) { 2146 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid"); 2147 if (err) { 2148 dev_err(DEV, "Writing bitmap failed with %d\n",err); 2149 retcode = ERR_IO_MD_DISK; 2150 } 2151 if (skip_initial_sync) { 2152 drbd_send_uuids_skip_initial_sync(mdev); 2153 _drbd_uuid_set(mdev, UI_BITMAP, 0); 2154 drbd_print_uuids(mdev, "cleared bitmap UUID"); 2155 spin_lock_irq(&mdev->req_lock); 2156 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 2157 CS_VERBOSE, NULL); 2158 spin_unlock_irq(&mdev->req_lock); 2159 } 2160 } 2161 2162 drbd_md_sync(mdev); 2163out_dec: 2164 put_ldev(mdev); 2165out: 2166 mutex_unlock(&mdev->state_mutex); 2167 2168 reply->ret_code = retcode; 2169 return 0; 2170} 2171 2172struct cn_handler_struct { 2173 int (*function)(struct drbd_conf *, 2174 struct drbd_nl_cfg_req *, 2175 struct drbd_nl_cfg_reply *); 2176 int reply_body_size; 2177}; 2178 2179static struct cn_handler_struct cnd_table[] = { 2180 [ P_primary ] = { &drbd_nl_primary, 0 }, 2181 [ P_secondary ] = { &drbd_nl_secondary, 0 }, 2182 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 }, 2183 [ P_detach ] = { &drbd_nl_detach, 0 }, 2184 [ P_net_conf ] = { &drbd_nl_net_conf, 0 }, 2185 [ P_disconnect ] = { &drbd_nl_disconnect, 0 }, 2186 [ P_resize ] = { &drbd_nl_resize, 0 }, 2187 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 }, 2188 [ P_invalidate ] = { &drbd_nl_invalidate, 0 }, 2189 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 }, 2190 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 }, 2191 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 }, 2192 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 }, 2193 [ P_resume_io ] = { &drbd_nl_resume_io, 0 }, 2194 [ P_outdate ] = { &drbd_nl_outdate, 0 }, 2195 [ P_get_config ] = { &drbd_nl_get_config, 2196 sizeof(struct syncer_conf_tag_len_struct) + 2197 sizeof(struct disk_conf_tag_len_struct) + 2198 sizeof(struct net_conf_tag_len_struct) }, 2199 [ P_get_state ] = { &drbd_nl_get_state, 2200 sizeof(struct get_state_tag_len_struct) + 2201 sizeof(struct sync_progress_tag_len_struct) }, 2202 [ P_get_uuids ] = { &drbd_nl_get_uuids, 2203 sizeof(struct get_uuids_tag_len_struct) }, 2204 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag, 2205 sizeof(struct get_timeout_flag_tag_len_struct)}, 2206 [ P_start_ov ] = { &drbd_nl_start_ov, 0 }, 2207 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 }, 2208}; 2209 2210static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp) 2211{ 2212 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data; 2213 struct cn_handler_struct *cm; 2214 struct cn_msg *cn_reply; 2215 struct drbd_nl_cfg_reply *reply; 2216 struct drbd_conf *mdev; 2217 int retcode, rr; 2218 int reply_size = sizeof(struct cn_msg) 2219 + sizeof(struct drbd_nl_cfg_reply) 2220 + sizeof(short int); 2221 2222 if (!try_module_get(THIS_MODULE)) { 2223 printk(KERN_ERR "drbd: try_module_get() failed!\n"); 2224 return; 2225 } 2226 2227 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) { 2228 retcode = ERR_PERM; 2229 goto fail; 2230 } 2231 2232 mdev = ensure_mdev(nlp->drbd_minor, 2233 (nlp->flags & DRBD_NL_CREATE_DEVICE)); 2234 if (!mdev) { 2235 retcode = ERR_MINOR_INVALID; 2236 goto fail; 2237 } 2238 2239 if (nlp->packet_type >= P_nl_after_last_packet || 2240 nlp->packet_type == P_return_code_only) { 2241 retcode = ERR_PACKET_NR; 2242 goto fail; 2243 } 2244 2245 cm = cnd_table + nlp->packet_type; 2246 2247 /* This may happen if packet number is 0: */ 2248 if (cm->function == NULL) { 2249 retcode = ERR_PACKET_NR; 2250 goto fail; 2251 } 2252 2253 reply_size += cm->reply_body_size; 2254 2255 /* allocation not in the IO path, cqueue thread context */ 2256 cn_reply = kzalloc(reply_size, GFP_KERNEL); 2257 if (!cn_reply) { 2258 retcode = ERR_NOMEM; 2259 goto fail; 2260 } 2261 reply = (struct drbd_nl_cfg_reply *) cn_reply->data; 2262 2263 reply->packet_type = 2264 cm->reply_body_size ? nlp->packet_type : P_return_code_only; 2265 reply->minor = nlp->drbd_minor; 2266 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */ 2267 /* reply->tag_list; might be modified by cm->function. */ 2268 2269 rr = cm->function(mdev, nlp, reply); 2270 2271 cn_reply->id = req->id; 2272 cn_reply->seq = req->seq; 2273 cn_reply->ack = req->ack + 1; 2274 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr; 2275 cn_reply->flags = 0; 2276 2277 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL); 2278 if (rr && rr != -ESRCH) 2279 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2280 2281 kfree(cn_reply); 2282 module_put(THIS_MODULE); 2283 return; 2284 fail: 2285 drbd_nl_send_reply(req, retcode); 2286 module_put(THIS_MODULE); 2287} 2288 2289static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */ 2290 2291static unsigned short * 2292__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, 2293 unsigned short len, int nul_terminated) 2294{ 2295 unsigned short l = tag_descriptions[tag_number(tag)].max_len; 2296 len = (len < l) ? len : l; 2297 put_unaligned(tag, tl++); 2298 put_unaligned(len, tl++); 2299 memcpy(tl, data, len); 2300 tl = (unsigned short*)((char*)tl + len); 2301 if (nul_terminated) 2302 *((char*)tl - 1) = 0; 2303 return tl; 2304} 2305 2306static unsigned short * 2307tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len) 2308{ 2309 return __tl_add_blob(tl, tag, data, len, 0); 2310} 2311 2312static unsigned short * 2313tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str) 2314{ 2315 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0); 2316} 2317 2318static unsigned short * 2319tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val) 2320{ 2321 put_unaligned(tag, tl++); 2322 switch(tag_type(tag)) { 2323 case TT_INTEGER: 2324 put_unaligned(sizeof(int), tl++); 2325 put_unaligned(*(int *)val, (int *)tl); 2326 tl = (unsigned short*)((char*)tl+sizeof(int)); 2327 break; 2328 case TT_INT64: 2329 put_unaligned(sizeof(u64), tl++); 2330 put_unaligned(*(u64 *)val, (u64 *)tl); 2331 tl = (unsigned short*)((char*)tl+sizeof(u64)); 2332 break; 2333 default: 2334 /* someone did something stupid. */ 2335 ; 2336 } 2337 return tl; 2338} 2339 2340void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state) 2341{ 2342 char buffer[sizeof(struct cn_msg)+ 2343 sizeof(struct drbd_nl_cfg_reply)+ 2344 sizeof(struct get_state_tag_len_struct)+ 2345 sizeof(short int)]; 2346 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2347 struct drbd_nl_cfg_reply *reply = 2348 (struct drbd_nl_cfg_reply *)cn_reply->data; 2349 unsigned short *tl = reply->tag_list; 2350 2351 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2352 2353 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl); 2354 2355 put_unaligned(TT_END, tl++); /* Close the tag list */ 2356 2357 cn_reply->id.idx = CN_IDX_DRBD; 2358 cn_reply->id.val = CN_VAL_DRBD; 2359 2360 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2361 cn_reply->ack = 0; /* not used here. */ 2362 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2363 (int)((char *)tl - (char *)reply->tag_list); 2364 cn_reply->flags = 0; 2365 2366 reply->packet_type = P_get_state; 2367 reply->minor = mdev_to_minor(mdev); 2368 reply->ret_code = NO_ERROR; 2369 2370 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2371} 2372 2373void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name) 2374{ 2375 char buffer[sizeof(struct cn_msg)+ 2376 sizeof(struct drbd_nl_cfg_reply)+ 2377 sizeof(struct call_helper_tag_len_struct)+ 2378 sizeof(short int)]; 2379 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2380 struct drbd_nl_cfg_reply *reply = 2381 (struct drbd_nl_cfg_reply *)cn_reply->data; 2382 unsigned short *tl = reply->tag_list; 2383 2384 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2385 2386 tl = tl_add_str(tl, T_helper, helper_name); 2387 put_unaligned(TT_END, tl++); /* Close the tag list */ 2388 2389 cn_reply->id.idx = CN_IDX_DRBD; 2390 cn_reply->id.val = CN_VAL_DRBD; 2391 2392 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2393 cn_reply->ack = 0; /* not used here. */ 2394 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2395 (int)((char *)tl - (char *)reply->tag_list); 2396 cn_reply->flags = 0; 2397 2398 reply->packet_type = P_call_helper; 2399 reply->minor = mdev_to_minor(mdev); 2400 reply->ret_code = NO_ERROR; 2401 2402 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2403} 2404 2405void drbd_bcast_ee(struct drbd_conf *mdev, 2406 const char *reason, const int dgs, 2407 const char* seen_hash, const char* calc_hash, 2408 const struct drbd_epoch_entry* e) 2409{ 2410 struct cn_msg *cn_reply; 2411 struct drbd_nl_cfg_reply *reply; 2412 unsigned short *tl; 2413 struct page *page; 2414 unsigned len; 2415 2416 if (!e) 2417 return; 2418 if (!reason || !reason[0]) 2419 return; 2420 2421 /* apparently we have to memcpy twice, first to prepare the data for the 2422 * struct cn_msg, then within cn_netlink_send from the cn_msg to the 2423 * netlink skb. */ 2424 /* receiver thread context, which is not in the writeout path (of this node), 2425 * but may be in the writeout path of the _other_ node. 2426 * GFP_NOIO to avoid potential "distributed deadlock". */ 2427 cn_reply = kzalloc( 2428 sizeof(struct cn_msg)+ 2429 sizeof(struct drbd_nl_cfg_reply)+ 2430 sizeof(struct dump_ee_tag_len_struct)+ 2431 sizeof(short int), 2432 GFP_NOIO); 2433 2434 if (!cn_reply) { 2435 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n", 2436 (unsigned long long)e->sector, e->size); 2437 return; 2438 } 2439 2440 reply = (struct drbd_nl_cfg_reply*)cn_reply->data; 2441 tl = reply->tag_list; 2442 2443 tl = tl_add_str(tl, T_dump_ee_reason, reason); 2444 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs); 2445 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs); 2446 tl = tl_add_int(tl, T_ee_sector, &e->sector); 2447 tl = tl_add_int(tl, T_ee_block_id, &e->block_id); 2448 2449 /* dump the first 32k */ 2450 len = min_t(unsigned, e->size, 32 << 10); 2451 put_unaligned(T_ee_data, tl++); 2452 put_unaligned(len, tl++); 2453 2454 page = e->pages; 2455 page_chain_for_each(page) { 2456 void *d = kmap_atomic(page, KM_USER0); 2457 unsigned l = min_t(unsigned, len, PAGE_SIZE); 2458 memcpy(tl, d, l); 2459 kunmap_atomic(d, KM_USER0); 2460 tl = (unsigned short*)((char*)tl + l); 2461 len -= l; 2462 if (len == 0) 2463 break; 2464 } 2465 put_unaligned(TT_END, tl++); /* Close the tag list */ 2466 2467 cn_reply->id.idx = CN_IDX_DRBD; 2468 cn_reply->id.val = CN_VAL_DRBD; 2469 2470 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq); 2471 cn_reply->ack = 0; // not used here. 2472 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2473 (int)((char*)tl - (char*)reply->tag_list); 2474 cn_reply->flags = 0; 2475 2476 reply->packet_type = P_dump_ee; 2477 reply->minor = mdev_to_minor(mdev); 2478 reply->ret_code = NO_ERROR; 2479 2480 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2481 kfree(cn_reply); 2482} 2483 2484void drbd_bcast_sync_progress(struct drbd_conf *mdev) 2485{ 2486 char buffer[sizeof(struct cn_msg)+ 2487 sizeof(struct drbd_nl_cfg_reply)+ 2488 sizeof(struct sync_progress_tag_len_struct)+ 2489 sizeof(short int)]; 2490 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2491 struct drbd_nl_cfg_reply *reply = 2492 (struct drbd_nl_cfg_reply *)cn_reply->data; 2493 unsigned short *tl = reply->tag_list; 2494 unsigned long rs_left; 2495 unsigned int res; 2496 2497 /* no local ref, no bitmap, no syncer progress, no broadcast. */ 2498 if (!get_ldev(mdev)) 2499 return; 2500 drbd_get_syncer_progress(mdev, &rs_left, &res); 2501 put_ldev(mdev); 2502 2503 tl = tl_add_int(tl, T_sync_progress, &res); 2504 put_unaligned(TT_END, tl++); /* Close the tag list */ 2505 2506 cn_reply->id.idx = CN_IDX_DRBD; 2507 cn_reply->id.val = CN_VAL_DRBD; 2508 2509 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2510 cn_reply->ack = 0; /* not used here. */ 2511 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2512 (int)((char *)tl - (char *)reply->tag_list); 2513 cn_reply->flags = 0; 2514 2515 reply->packet_type = P_sync_progress; 2516 reply->minor = mdev_to_minor(mdev); 2517 reply->ret_code = NO_ERROR; 2518 2519 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2520} 2521 2522int __init drbd_nl_init(void) 2523{ 2524 static struct cb_id cn_id_drbd; 2525 int err, try=10; 2526 2527 cn_id_drbd.val = CN_VAL_DRBD; 2528 do { 2529 cn_id_drbd.idx = cn_idx; 2530 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback); 2531 if (!err) 2532 break; 2533 cn_idx = (cn_idx + CN_IDX_STEP); 2534 } while (try--); 2535 2536 if (err) { 2537 printk(KERN_ERR "drbd: cn_drbd failed to register\n"); 2538 return err; 2539 } 2540 2541 return 0; 2542} 2543 2544void drbd_nl_cleanup(void) 2545{ 2546 static struct cb_id cn_id_drbd; 2547 2548 cn_id_drbd.idx = cn_idx; 2549 cn_id_drbd.val = CN_VAL_DRBD; 2550 2551 cn_del_callback(&cn_id_drbd); 2552} 2553 2554void drbd_nl_send_reply(struct cn_msg *req, int ret_code) 2555{ 2556 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)]; 2557 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2558 struct drbd_nl_cfg_reply *reply = 2559 (struct drbd_nl_cfg_reply *)cn_reply->data; 2560 int rr; 2561 2562 memset(buffer, 0, sizeof(buffer)); 2563 cn_reply->id = req->id; 2564 2565 cn_reply->seq = req->seq; 2566 cn_reply->ack = req->ack + 1; 2567 cn_reply->len = sizeof(struct drbd_nl_cfg_reply); 2568 cn_reply->flags = 0; 2569 2570 reply->packet_type = P_return_code_only; 2571 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor; 2572 reply->ret_code = ret_code; 2573 2574 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2575 if (rr && rr != -ESRCH) 2576 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2577} 2578 2579