drbd_nl.c revision 0778286a133d2d3f81861a4e5db308e359583006
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 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb); 176 177 drbd_bcast_ev_helper(mdev, cmd); 178 ret = call_usermodehelper(usermode_helper, argv, envp, 1); 179 if (ret) 180 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n", 181 usermode_helper, cmd, mb, 182 (ret >> 8) & 0xff, ret); 183 else 184 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n", 185 usermode_helper, cmd, mb, 186 (ret >> 8) & 0xff, ret); 187 188 if (ret < 0) /* Ignore any ERRNOs we got. */ 189 ret = 0; 190 191 return ret; 192} 193 194enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev) 195{ 196 char *ex_to_string; 197 int r; 198 enum drbd_disk_state nps; 199 enum drbd_fencing_p fp; 200 201 D_ASSERT(mdev->state.pdsk == D_UNKNOWN); 202 203 if (get_ldev_if_state(mdev, D_CONSISTENT)) { 204 fp = mdev->ldev->dc.fencing; 205 put_ldev(mdev); 206 } else { 207 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n"); 208 return mdev->state.pdsk; 209 } 210 211 r = drbd_khelper(mdev, "fence-peer"); 212 213 switch ((r>>8) & 0xff) { 214 case 3: /* peer is inconsistent */ 215 ex_to_string = "peer is inconsistent or worse"; 216 nps = D_INCONSISTENT; 217 break; 218 case 4: /* peer got outdated, or was already outdated */ 219 ex_to_string = "peer was fenced"; 220 nps = D_OUTDATED; 221 break; 222 case 5: /* peer was down */ 223 if (mdev->state.disk == D_UP_TO_DATE) { 224 /* we will(have) create(d) a new UUID anyways... */ 225 ex_to_string = "peer is unreachable, assumed to be dead"; 226 nps = D_OUTDATED; 227 } else { 228 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate"; 229 nps = mdev->state.pdsk; 230 } 231 break; 232 case 6: /* Peer is primary, voluntarily outdate myself. 233 * This is useful when an unconnected R_SECONDARY is asked to 234 * become R_PRIMARY, but finds the other peer being active. */ 235 ex_to_string = "peer is active"; 236 dev_warn(DEV, "Peer is primary, outdating myself.\n"); 237 nps = D_UNKNOWN; 238 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE); 239 break; 240 case 7: 241 if (fp != FP_STONITH) 242 dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n"); 243 ex_to_string = "peer was stonithed"; 244 nps = D_OUTDATED; 245 break; 246 default: 247 /* The script is broken ... */ 248 nps = D_UNKNOWN; 249 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff); 250 return nps; 251 } 252 253 dev_info(DEV, "fence-peer helper returned %d (%s)\n", 254 (r>>8) & 0xff, ex_to_string); 255 return nps; 256} 257 258static int _try_outdate_peer_async(void *data) 259{ 260 struct drbd_conf *mdev = (struct drbd_conf *)data; 261 enum drbd_disk_state nps; 262 263 nps = drbd_try_outdate_peer(mdev); 264 drbd_request_state(mdev, NS(pdsk, nps)); 265 266 return 0; 267} 268 269void drbd_try_outdate_peer_async(struct drbd_conf *mdev) 270{ 271 struct task_struct *opa; 272 273 opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev)); 274 if (IS_ERR(opa)) 275 dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n"); 276} 277 278int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force) 279{ 280 const int max_tries = 4; 281 int r = 0; 282 int try = 0; 283 int forced = 0; 284 union drbd_state mask, val; 285 enum drbd_disk_state nps; 286 287 if (new_role == R_PRIMARY) 288 request_ping(mdev); /* Detect a dead peer ASAP */ 289 290 mutex_lock(&mdev->state_mutex); 291 292 mask.i = 0; mask.role = R_MASK; 293 val.i = 0; val.role = new_role; 294 295 while (try++ < max_tries) { 296 r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE); 297 298 /* in case we first succeeded to outdate, 299 * but now suddenly could establish a connection */ 300 if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) { 301 val.pdsk = 0; 302 mask.pdsk = 0; 303 continue; 304 } 305 306 if (r == SS_NO_UP_TO_DATE_DISK && force && 307 (mdev->state.disk < D_UP_TO_DATE && 308 mdev->state.disk >= D_INCONSISTENT)) { 309 mask.disk = D_MASK; 310 val.disk = D_UP_TO_DATE; 311 forced = 1; 312 continue; 313 } 314 315 if (r == SS_NO_UP_TO_DATE_DISK && 316 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) { 317 D_ASSERT(mdev->state.pdsk == D_UNKNOWN); 318 nps = drbd_try_outdate_peer(mdev); 319 320 if (nps == D_OUTDATED || nps == D_INCONSISTENT) { 321 val.disk = D_UP_TO_DATE; 322 mask.disk = D_MASK; 323 } 324 325 val.pdsk = nps; 326 mask.pdsk = D_MASK; 327 328 continue; 329 } 330 331 if (r == SS_NOTHING_TO_DO) 332 goto fail; 333 if (r == SS_PRIMARY_NOP && mask.pdsk == 0) { 334 nps = drbd_try_outdate_peer(mdev); 335 336 if (force && nps > D_OUTDATED) { 337 dev_warn(DEV, "Forced into split brain situation!\n"); 338 nps = D_OUTDATED; 339 } 340 341 mask.pdsk = D_MASK; 342 val.pdsk = nps; 343 344 continue; 345 } 346 if (r == SS_TWO_PRIMARIES) { 347 /* Maybe the peer is detected as dead very soon... 348 retry at most once more in this case. */ 349 __set_current_state(TASK_INTERRUPTIBLE); 350 schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10); 351 if (try < max_tries) 352 try = max_tries - 1; 353 continue; 354 } 355 if (r < SS_SUCCESS) { 356 r = _drbd_request_state(mdev, mask, val, 357 CS_VERBOSE + CS_WAIT_COMPLETE); 358 if (r < SS_SUCCESS) 359 goto fail; 360 } 361 break; 362 } 363 364 if (r < SS_SUCCESS) 365 goto fail; 366 367 if (forced) 368 dev_warn(DEV, "Forced to consider local data as UpToDate!\n"); 369 370 /* Wait until nothing is on the fly :) */ 371 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0); 372 373 if (new_role == R_SECONDARY) { 374 set_disk_ro(mdev->vdisk, TRUE); 375 if (get_ldev(mdev)) { 376 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; 377 put_ldev(mdev); 378 } 379 } else { 380 if (get_net_conf(mdev)) { 381 mdev->net_conf->want_lose = 0; 382 put_net_conf(mdev); 383 } 384 set_disk_ro(mdev->vdisk, FALSE); 385 if (get_ldev(mdev)) { 386 if (((mdev->state.conn < C_CONNECTED || 387 mdev->state.pdsk <= D_FAILED) 388 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced) 389 drbd_uuid_new_current(mdev); 390 391 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1; 392 put_ldev(mdev); 393 } 394 } 395 396 if ((new_role == R_SECONDARY) && get_ldev(mdev)) { 397 drbd_al_to_on_disk_bm(mdev); 398 put_ldev(mdev); 399 } 400 401 if (mdev->state.conn >= C_WF_REPORT_PARAMS) { 402 /* if this was forced, we should consider sync */ 403 if (forced) 404 drbd_send_uuids(mdev); 405 drbd_send_state(mdev); 406 } 407 408 drbd_md_sync(mdev); 409 410 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 411 fail: 412 mutex_unlock(&mdev->state_mutex); 413 return r; 414} 415 416 417static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 418 struct drbd_nl_cfg_reply *reply) 419{ 420 struct primary primary_args; 421 422 memset(&primary_args, 0, sizeof(struct primary)); 423 if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) { 424 reply->ret_code = ERR_MANDATORY_TAG; 425 return 0; 426 } 427 428 reply->ret_code = 429 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force); 430 431 return 0; 432} 433 434static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 435 struct drbd_nl_cfg_reply *reply) 436{ 437 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0); 438 439 return 0; 440} 441 442/* initializes the md.*_offset members, so we are able to find 443 * the on disk meta data */ 444static void drbd_md_set_sector_offsets(struct drbd_conf *mdev, 445 struct drbd_backing_dev *bdev) 446{ 447 sector_t md_size_sect = 0; 448 switch (bdev->dc.meta_dev_idx) { 449 default: 450 /* v07 style fixed size indexed meta data */ 451 bdev->md.md_size_sect = MD_RESERVED_SECT; 452 bdev->md.md_offset = drbd_md_ss__(mdev, bdev); 453 bdev->md.al_offset = MD_AL_OFFSET; 454 bdev->md.bm_offset = MD_BM_OFFSET; 455 break; 456 case DRBD_MD_INDEX_FLEX_EXT: 457 /* just occupy the full device; unit: sectors */ 458 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev); 459 bdev->md.md_offset = 0; 460 bdev->md.al_offset = MD_AL_OFFSET; 461 bdev->md.bm_offset = MD_BM_OFFSET; 462 break; 463 case DRBD_MD_INDEX_INTERNAL: 464 case DRBD_MD_INDEX_FLEX_INT: 465 bdev->md.md_offset = drbd_md_ss__(mdev, bdev); 466 /* al size is still fixed */ 467 bdev->md.al_offset = -MD_AL_MAX_SIZE; 468 /* we need (slightly less than) ~ this much bitmap sectors: */ 469 md_size_sect = drbd_get_capacity(bdev->backing_bdev); 470 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT); 471 md_size_sect = BM_SECT_TO_EXT(md_size_sect); 472 md_size_sect = ALIGN(md_size_sect, 8); 473 474 /* plus the "drbd meta data super block", 475 * and the activity log; */ 476 md_size_sect += MD_BM_OFFSET; 477 478 bdev->md.md_size_sect = md_size_sect; 479 /* bitmap offset is adjusted by 'super' block size */ 480 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET; 481 break; 482 } 483} 484 485char *ppsize(char *buf, unsigned long long size) 486{ 487 /* Needs 9 bytes at max. */ 488 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' }; 489 int base = 0; 490 while (size >= 10000) { 491 /* shift + round */ 492 size = (size >> 10) + !!(size & (1<<9)); 493 base++; 494 } 495 sprintf(buf, "%lu %cB", (long)size, units[base]); 496 497 return buf; 498} 499 500/* there is still a theoretical deadlock when called from receiver 501 * on an D_INCONSISTENT R_PRIMARY: 502 * remote READ does inc_ap_bio, receiver would need to receive answer 503 * packet from remote to dec_ap_bio again. 504 * receiver receive_sizes(), comes here, 505 * waits for ap_bio_cnt == 0. -> deadlock. 506 * but this cannot happen, actually, because: 507 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable 508 * (not connected, or bad/no disk on peer): 509 * see drbd_fail_request_early, ap_bio_cnt is zero. 510 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET: 511 * peer may not initiate a resize. 512 */ 513void drbd_suspend_io(struct drbd_conf *mdev) 514{ 515 set_bit(SUSPEND_IO, &mdev->flags); 516 if (mdev->state.susp) 517 return; 518 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); 519} 520 521void drbd_resume_io(struct drbd_conf *mdev) 522{ 523 clear_bit(SUSPEND_IO, &mdev->flags); 524 wake_up(&mdev->misc_wait); 525} 526 527/** 528 * drbd_determine_dev_size() - Sets the right device size obeying all constraints 529 * @mdev: DRBD device. 530 * 531 * Returns 0 on success, negative return values indicate errors. 532 * You should call drbd_md_sync() after calling this function. 533 */ 534enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local) 535{ 536 sector_t prev_first_sect, prev_size; /* previous meta location */ 537 sector_t la_size; 538 sector_t size; 539 char ppb[10]; 540 541 int md_moved, la_size_changed; 542 enum determine_dev_size rv = unchanged; 543 544 /* race: 545 * application request passes inc_ap_bio, 546 * but then cannot get an AL-reference. 547 * this function later may wait on ap_bio_cnt == 0. -> deadlock. 548 * 549 * to avoid that: 550 * Suspend IO right here. 551 * still lock the act_log to not trigger ASSERTs there. 552 */ 553 drbd_suspend_io(mdev); 554 555 /* no wait necessary anymore, actually we could assert that */ 556 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); 557 558 prev_first_sect = drbd_md_first_sector(mdev->ldev); 559 prev_size = mdev->ldev->md.md_size_sect; 560 la_size = mdev->ldev->md.la_size_sect; 561 562 /* TODO: should only be some assert here, not (re)init... */ 563 drbd_md_set_sector_offsets(mdev, mdev->ldev); 564 565 size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED); 566 567 if (drbd_get_capacity(mdev->this_bdev) != size || 568 drbd_bm_capacity(mdev) != size) { 569 int err; 570 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC)); 571 if (unlikely(err)) { 572 /* currently there is only one error: ENOMEM! */ 573 size = drbd_bm_capacity(mdev)>>1; 574 if (size == 0) { 575 dev_err(DEV, "OUT OF MEMORY! " 576 "Could not allocate bitmap!\n"); 577 } else { 578 dev_err(DEV, "BM resizing failed. " 579 "Leaving size unchanged at size = %lu KB\n", 580 (unsigned long)size); 581 } 582 rv = dev_size_error; 583 } 584 /* racy, see comments above. */ 585 drbd_set_my_capacity(mdev, size); 586 mdev->ldev->md.la_size_sect = size; 587 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1), 588 (unsigned long long)size>>1); 589 } 590 if (rv == dev_size_error) 591 goto out; 592 593 la_size_changed = (la_size != mdev->ldev->md.la_size_sect); 594 595 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev) 596 || prev_size != mdev->ldev->md.md_size_sect; 597 598 if (la_size_changed || md_moved) { 599 drbd_al_shrink(mdev); /* All extents inactive. */ 600 dev_info(DEV, "Writing the whole bitmap, %s\n", 601 la_size_changed && md_moved ? "size changed and md moved" : 602 la_size_changed ? "size changed" : "md moved"); 603 rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */ 604 drbd_md_mark_dirty(mdev); 605 } 606 607 if (size > la_size) 608 rv = grew; 609 if (size < la_size) 610 rv = shrunk; 611out: 612 lc_unlock(mdev->act_log); 613 wake_up(&mdev->al_wait); 614 drbd_resume_io(mdev); 615 616 return rv; 617} 618 619sector_t 620drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space) 621{ 622 sector_t p_size = mdev->p_size; /* partner's disk size. */ 623 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */ 624 sector_t m_size; /* my size */ 625 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */ 626 sector_t size = 0; 627 628 m_size = drbd_get_max_capacity(bdev); 629 630 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) { 631 dev_warn(DEV, "Resize while not connected was forced by the user!\n"); 632 p_size = m_size; 633 } 634 635 if (p_size && m_size) { 636 size = min_t(sector_t, p_size, m_size); 637 } else { 638 if (la_size) { 639 size = la_size; 640 if (m_size && m_size < size) 641 size = m_size; 642 if (p_size && p_size < size) 643 size = p_size; 644 } else { 645 if (m_size) 646 size = m_size; 647 if (p_size) 648 size = p_size; 649 } 650 } 651 652 if (size == 0) 653 dev_err(DEV, "Both nodes diskless!\n"); 654 655 if (u_size) { 656 if (u_size > size) 657 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n", 658 (unsigned long)u_size>>1, (unsigned long)size>>1); 659 else 660 size = u_size; 661 } 662 663 return size; 664} 665 666/** 667 * drbd_check_al_size() - Ensures that the AL is of the right size 668 * @mdev: DRBD device. 669 * 670 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation 671 * failed, and 0 on success. You should call drbd_md_sync() after you called 672 * this function. 673 */ 674static int drbd_check_al_size(struct drbd_conf *mdev) 675{ 676 struct lru_cache *n, *t; 677 struct lc_element *e; 678 unsigned int in_use; 679 int i; 680 681 ERR_IF(mdev->sync_conf.al_extents < 7) 682 mdev->sync_conf.al_extents = 127; 683 684 if (mdev->act_log && 685 mdev->act_log->nr_elements == mdev->sync_conf.al_extents) 686 return 0; 687 688 in_use = 0; 689 t = mdev->act_log; 690 n = lc_create("act_log", drbd_al_ext_cache, 691 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0); 692 693 if (n == NULL) { 694 dev_err(DEV, "Cannot allocate act_log lru!\n"); 695 return -ENOMEM; 696 } 697 spin_lock_irq(&mdev->al_lock); 698 if (t) { 699 for (i = 0; i < t->nr_elements; i++) { 700 e = lc_element_by_index(t, i); 701 if (e->refcnt) 702 dev_err(DEV, "refcnt(%d)==%d\n", 703 e->lc_number, e->refcnt); 704 in_use += e->refcnt; 705 } 706 } 707 if (!in_use) 708 mdev->act_log = n; 709 spin_unlock_irq(&mdev->al_lock); 710 if (in_use) { 711 dev_err(DEV, "Activity log still in use!\n"); 712 lc_destroy(n); 713 return -EBUSY; 714 } else { 715 if (t) 716 lc_destroy(t); 717 } 718 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */ 719 return 0; 720} 721 722void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local) 723{ 724 struct request_queue * const q = mdev->rq_queue; 725 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue; 726 int max_segments = mdev->ldev->dc.max_bio_bvecs; 727 728 max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s); 729 730 blk_queue_max_hw_sectors(q, max_seg_s >> 9); 731 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS); 732 blk_queue_max_segment_size(q, max_seg_s); 733 blk_queue_logical_block_size(q, 512); 734 blk_queue_segment_boundary(q, PAGE_SIZE-1); 735 blk_stack_limits(&q->limits, &b->limits, 0); 736 737 if (b->merge_bvec_fn) 738 dev_warn(DEV, "Backing device's merge_bvec_fn() = %p\n", 739 b->merge_bvec_fn); 740 dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q)); 741 742 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) { 743 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n", 744 q->backing_dev_info.ra_pages, 745 b->backing_dev_info.ra_pages); 746 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages; 747 } 748} 749 750/* serialize deconfig (worker exiting, doing cleanup) 751 * and reconfig (drbdsetup disk, drbdsetup net) 752 * 753 * wait for a potentially exiting worker, then restart it, 754 * or start a new one. 755 */ 756static void drbd_reconfig_start(struct drbd_conf *mdev) 757{ 758 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags)); 759 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags)); 760 drbd_thread_start(&mdev->worker); 761} 762 763/* if still unconfigured, stops worker again. 764 * if configured now, clears CONFIG_PENDING. 765 * wakes potential waiters */ 766static void drbd_reconfig_done(struct drbd_conf *mdev) 767{ 768 spin_lock_irq(&mdev->req_lock); 769 if (mdev->state.disk == D_DISKLESS && 770 mdev->state.conn == C_STANDALONE && 771 mdev->state.role == R_SECONDARY) { 772 set_bit(DEVICE_DYING, &mdev->flags); 773 drbd_thread_stop_nowait(&mdev->worker); 774 } else 775 clear_bit(CONFIG_PENDING, &mdev->flags); 776 spin_unlock_irq(&mdev->req_lock); 777 wake_up(&mdev->state_wait); 778} 779 780/* Make sure IO is suspended before calling this function(). */ 781static void drbd_suspend_al(struct drbd_conf *mdev) 782{ 783 int s = 0; 784 785 if (lc_try_lock(mdev->act_log)) { 786 drbd_al_shrink(mdev); 787 lc_unlock(mdev->act_log); 788 } else { 789 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n"); 790 return; 791 } 792 793 spin_lock_irq(&mdev->req_lock); 794 if (mdev->state.conn < C_CONNECTED) 795 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags); 796 797 spin_unlock_irq(&mdev->req_lock); 798 799 if (s) 800 dev_info(DEV, "Suspended AL updates\n"); 801} 802 803/* does always return 0; 804 * interesting return code is in reply->ret_code */ 805static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 806 struct drbd_nl_cfg_reply *reply) 807{ 808 enum drbd_ret_codes retcode; 809 enum determine_dev_size dd; 810 sector_t max_possible_sectors; 811 sector_t min_md_device_sectors; 812 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */ 813 struct inode *inode, *inode2; 814 struct lru_cache *resync_lru = NULL; 815 union drbd_state ns, os; 816 int rv; 817 int cp_discovered = 0; 818 int logical_block_size; 819 820 drbd_reconfig_start(mdev); 821 822 /* if you want to reconfigure, please tear down first */ 823 if (mdev->state.disk > D_DISKLESS) { 824 retcode = ERR_DISK_CONFIGURED; 825 goto fail; 826 } 827 828 /* allocation not in the IO path, cqueue thread context */ 829 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL); 830 if (!nbc) { 831 retcode = ERR_NOMEM; 832 goto fail; 833 } 834 835 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF; 836 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF; 837 nbc->dc.fencing = DRBD_FENCING_DEF; 838 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF; 839 840 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) { 841 retcode = ERR_MANDATORY_TAG; 842 goto fail; 843 } 844 845 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) { 846 retcode = ERR_MD_IDX_INVALID; 847 goto fail; 848 } 849 850 if (get_net_conf(mdev)) { 851 int prot = mdev->net_conf->wire_protocol; 852 put_net_conf(mdev); 853 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) { 854 retcode = ERR_STONITH_AND_PROT_A; 855 goto fail; 856 } 857 } 858 859 nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0); 860 if (IS_ERR(nbc->lo_file)) { 861 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev, 862 PTR_ERR(nbc->lo_file)); 863 nbc->lo_file = NULL; 864 retcode = ERR_OPEN_DISK; 865 goto fail; 866 } 867 868 inode = nbc->lo_file->f_dentry->d_inode; 869 870 if (!S_ISBLK(inode->i_mode)) { 871 retcode = ERR_DISK_NOT_BDEV; 872 goto fail; 873 } 874 875 nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0); 876 if (IS_ERR(nbc->md_file)) { 877 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev, 878 PTR_ERR(nbc->md_file)); 879 nbc->md_file = NULL; 880 retcode = ERR_OPEN_MD_DISK; 881 goto fail; 882 } 883 884 inode2 = nbc->md_file->f_dentry->d_inode; 885 886 if (!S_ISBLK(inode2->i_mode)) { 887 retcode = ERR_MD_NOT_BDEV; 888 goto fail; 889 } 890 891 nbc->backing_bdev = inode->i_bdev; 892 if (bd_claim(nbc->backing_bdev, mdev)) { 893 printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n", 894 nbc->backing_bdev, mdev, 895 nbc->backing_bdev->bd_holder, 896 nbc->backing_bdev->bd_contains->bd_holder, 897 nbc->backing_bdev->bd_holders); 898 retcode = ERR_BDCLAIM_DISK; 899 goto fail; 900 } 901 902 resync_lru = lc_create("resync", drbd_bm_ext_cache, 903 61, sizeof(struct bm_extent), 904 offsetof(struct bm_extent, lce)); 905 if (!resync_lru) { 906 retcode = ERR_NOMEM; 907 goto release_bdev_fail; 908 } 909 910 /* meta_dev_idx >= 0: external fixed size, 911 * possibly multiple drbd sharing one meta device. 912 * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is 913 * not yet used by some other drbd minor! 914 * (if you use drbd.conf + drbdadm, 915 * that should check it for you already; but if you don't, or someone 916 * fooled it, we need to double check here) */ 917 nbc->md_bdev = inode2->i_bdev; 918 if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev 919 : (void *) drbd_m_holder)) { 920 retcode = ERR_BDCLAIM_MD_DISK; 921 goto release_bdev_fail; 922 } 923 924 if ((nbc->backing_bdev == nbc->md_bdev) != 925 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL || 926 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) { 927 retcode = ERR_MD_IDX_INVALID; 928 goto release_bdev2_fail; 929 } 930 931 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */ 932 drbd_md_set_sector_offsets(mdev, nbc); 933 934 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) { 935 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n", 936 (unsigned long long) drbd_get_max_capacity(nbc), 937 (unsigned long long) nbc->dc.disk_size); 938 retcode = ERR_DISK_TO_SMALL; 939 goto release_bdev2_fail; 940 } 941 942 if (nbc->dc.meta_dev_idx < 0) { 943 max_possible_sectors = DRBD_MAX_SECTORS_FLEX; 944 /* at least one MB, otherwise it does not make sense */ 945 min_md_device_sectors = (2<<10); 946 } else { 947 max_possible_sectors = DRBD_MAX_SECTORS; 948 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1); 949 } 950 951 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) { 952 retcode = ERR_MD_DISK_TO_SMALL; 953 dev_warn(DEV, "refusing attach: md-device too small, " 954 "at least %llu sectors needed for this meta-disk type\n", 955 (unsigned long long) min_md_device_sectors); 956 goto release_bdev2_fail; 957 } 958 959 /* Make sure the new disk is big enough 960 * (we may currently be R_PRIMARY with no local disk...) */ 961 if (drbd_get_max_capacity(nbc) < 962 drbd_get_capacity(mdev->this_bdev)) { 963 retcode = ERR_DISK_TO_SMALL; 964 goto release_bdev2_fail; 965 } 966 967 nbc->known_size = drbd_get_capacity(nbc->backing_bdev); 968 969 if (nbc->known_size > max_possible_sectors) { 970 dev_warn(DEV, "==> truncating very big lower level device " 971 "to currently maximum possible %llu sectors <==\n", 972 (unsigned long long) max_possible_sectors); 973 if (nbc->dc.meta_dev_idx >= 0) 974 dev_warn(DEV, "==>> using internal or flexible " 975 "meta data may help <<==\n"); 976 } 977 978 drbd_suspend_io(mdev); 979 /* also wait for the last barrier ack. */ 980 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || mdev->state.susp); 981 /* and for any other previously queued work */ 982 drbd_flush_workqueue(mdev); 983 984 retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE); 985 drbd_resume_io(mdev); 986 if (retcode < SS_SUCCESS) 987 goto release_bdev2_fail; 988 989 if (!get_ldev_if_state(mdev, D_ATTACHING)) 990 goto force_diskless; 991 992 drbd_md_set_sector_offsets(mdev, nbc); 993 994 /* allocate a second IO page if logical_block_size != 512 */ 995 logical_block_size = bdev_logical_block_size(nbc->md_bdev); 996 if (logical_block_size == 0) 997 logical_block_size = MD_SECTOR_SIZE; 998 999 if (logical_block_size != MD_SECTOR_SIZE) { 1000 if (!mdev->md_io_tmpp) { 1001 struct page *page = alloc_page(GFP_NOIO); 1002 if (!page) 1003 goto force_diskless_dec; 1004 1005 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n", 1006 logical_block_size, MD_SECTOR_SIZE); 1007 dev_warn(DEV, "Workaround engaged (has performance impact).\n"); 1008 1009 mdev->md_io_tmpp = page; 1010 } 1011 } 1012 1013 if (!mdev->bitmap) { 1014 if (drbd_bm_init(mdev)) { 1015 retcode = ERR_NOMEM; 1016 goto force_diskless_dec; 1017 } 1018 } 1019 1020 retcode = drbd_md_read(mdev, nbc); 1021 if (retcode != NO_ERROR) 1022 goto force_diskless_dec; 1023 1024 if (mdev->state.conn < C_CONNECTED && 1025 mdev->state.role == R_PRIMARY && 1026 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) { 1027 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n", 1028 (unsigned long long)mdev->ed_uuid); 1029 retcode = ERR_DATA_NOT_CURRENT; 1030 goto force_diskless_dec; 1031 } 1032 1033 /* Since we are diskless, fix the activity log first... */ 1034 if (drbd_check_al_size(mdev)) { 1035 retcode = ERR_NOMEM; 1036 goto force_diskless_dec; 1037 } 1038 1039 /* Prevent shrinking of consistent devices ! */ 1040 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) && 1041 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) { 1042 dev_warn(DEV, "refusing to truncate a consistent device\n"); 1043 retcode = ERR_DISK_TO_SMALL; 1044 goto force_diskless_dec; 1045 } 1046 1047 if (!drbd_al_read_log(mdev, nbc)) { 1048 retcode = ERR_IO_MD_DISK; 1049 goto force_diskless_dec; 1050 } 1051 1052 /* Reset the "barriers don't work" bits here, then force meta data to 1053 * be written, to ensure we determine if barriers are supported. */ 1054 if (nbc->dc.no_md_flush) 1055 set_bit(MD_NO_BARRIER, &mdev->flags); 1056 else 1057 clear_bit(MD_NO_BARRIER, &mdev->flags); 1058 1059 /* Point of no return reached. 1060 * Devices and memory are no longer released by error cleanup below. 1061 * now mdev takes over responsibility, and the state engine should 1062 * clean it up somewhere. */ 1063 D_ASSERT(mdev->ldev == NULL); 1064 mdev->ldev = nbc; 1065 mdev->resync = resync_lru; 1066 nbc = NULL; 1067 resync_lru = NULL; 1068 1069 mdev->write_ordering = WO_bio_barrier; 1070 drbd_bump_write_ordering(mdev, WO_bio_barrier); 1071 1072 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY)) 1073 set_bit(CRASHED_PRIMARY, &mdev->flags); 1074 else 1075 clear_bit(CRASHED_PRIMARY, &mdev->flags); 1076 1077 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && 1078 !(mdev->state.role == R_PRIMARY && mdev->state.susp && 1079 mdev->sync_conf.on_no_data == OND_SUSPEND_IO)) { 1080 set_bit(CRASHED_PRIMARY, &mdev->flags); 1081 cp_discovered = 1; 1082 } 1083 1084 mdev->send_cnt = 0; 1085 mdev->recv_cnt = 0; 1086 mdev->read_cnt = 0; 1087 mdev->writ_cnt = 0; 1088 1089 drbd_setup_queue_param(mdev, mdev->state.conn == C_CONNECTED && 1090 mdev->agreed_pro_version < 95 ? 1091 DRBD_MAX_SIZE_H80_PACKET : DRBD_MAX_SEGMENT_SIZE); 1092 1093 /* If I am currently not R_PRIMARY, 1094 * but meta data primary indicator is set, 1095 * I just now recover from a hard crash, 1096 * and have been R_PRIMARY before that crash. 1097 * 1098 * Now, if I had no connection before that crash 1099 * (have been degraded R_PRIMARY), chances are that 1100 * I won't find my peer now either. 1101 * 1102 * In that case, and _only_ in that case, 1103 * we use the degr-wfc-timeout instead of the default, 1104 * so we can automatically recover from a crash of a 1105 * degraded but active "cluster" after a certain timeout. 1106 */ 1107 clear_bit(USE_DEGR_WFC_T, &mdev->flags); 1108 if (mdev->state.role != R_PRIMARY && 1109 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && 1110 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND)) 1111 set_bit(USE_DEGR_WFC_T, &mdev->flags); 1112 1113 dd = drbd_determin_dev_size(mdev, 0); 1114 if (dd == dev_size_error) { 1115 retcode = ERR_NOMEM_BITMAP; 1116 goto force_diskless_dec; 1117 } else if (dd == grew) 1118 set_bit(RESYNC_AFTER_NEG, &mdev->flags); 1119 1120 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { 1121 dev_info(DEV, "Assuming that all blocks are out of sync " 1122 "(aka FullSync)\n"); 1123 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) { 1124 retcode = ERR_IO_MD_DISK; 1125 goto force_diskless_dec; 1126 } 1127 } else { 1128 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) { 1129 retcode = ERR_IO_MD_DISK; 1130 goto force_diskless_dec; 1131 } 1132 } 1133 1134 if (cp_discovered) { 1135 drbd_al_apply_to_bm(mdev); 1136 drbd_al_to_on_disk_bm(mdev); 1137 } 1138 1139 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev)) 1140 drbd_suspend_al(mdev); /* IO is still suspended here... */ 1141 1142 spin_lock_irq(&mdev->req_lock); 1143 os = mdev->state; 1144 ns.i = os.i; 1145 /* If MDF_CONSISTENT is not set go into inconsistent state, 1146 otherwise investigate MDF_WasUpToDate... 1147 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state, 1148 otherwise into D_CONSISTENT state. 1149 */ 1150 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) { 1151 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE)) 1152 ns.disk = D_CONSISTENT; 1153 else 1154 ns.disk = D_OUTDATED; 1155 } else { 1156 ns.disk = D_INCONSISTENT; 1157 } 1158 1159 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED)) 1160 ns.pdsk = D_OUTDATED; 1161 1162 if ( ns.disk == D_CONSISTENT && 1163 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE)) 1164 ns.disk = D_UP_TO_DATE; 1165 1166 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND, 1167 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before 1168 this point, because drbd_request_state() modifies these 1169 flags. */ 1170 1171 /* In case we are C_CONNECTED postpone any decision on the new disk 1172 state after the negotiation phase. */ 1173 if (mdev->state.conn == C_CONNECTED) { 1174 mdev->new_state_tmp.i = ns.i; 1175 ns.i = os.i; 1176 ns.disk = D_NEGOTIATING; 1177 1178 /* We expect to receive up-to-date UUIDs soon. 1179 To avoid a race in receive_state, free p_uuid while 1180 holding req_lock. I.e. atomic with the state change */ 1181 kfree(mdev->p_uuid); 1182 mdev->p_uuid = NULL; 1183 } 1184 1185 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 1186 ns = mdev->state; 1187 spin_unlock_irq(&mdev->req_lock); 1188 1189 if (rv < SS_SUCCESS) 1190 goto force_diskless_dec; 1191 1192 if (mdev->state.role == R_PRIMARY) 1193 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1; 1194 else 1195 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; 1196 1197 drbd_md_mark_dirty(mdev); 1198 drbd_md_sync(mdev); 1199 1200 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1201 put_ldev(mdev); 1202 reply->ret_code = retcode; 1203 drbd_reconfig_done(mdev); 1204 return 0; 1205 1206 force_diskless_dec: 1207 put_ldev(mdev); 1208 force_diskless: 1209 drbd_force_state(mdev, NS(disk, D_DISKLESS)); 1210 drbd_md_sync(mdev); 1211 release_bdev2_fail: 1212 if (nbc) 1213 bd_release(nbc->md_bdev); 1214 release_bdev_fail: 1215 if (nbc) 1216 bd_release(nbc->backing_bdev); 1217 fail: 1218 if (nbc) { 1219 if (nbc->lo_file) 1220 fput(nbc->lo_file); 1221 if (nbc->md_file) 1222 fput(nbc->md_file); 1223 kfree(nbc); 1224 } 1225 lc_destroy(resync_lru); 1226 1227 reply->ret_code = retcode; 1228 drbd_reconfig_done(mdev); 1229 return 0; 1230} 1231 1232static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1233 struct drbd_nl_cfg_reply *reply) 1234{ 1235 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS)); 1236 return 0; 1237} 1238 1239static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1240 struct drbd_nl_cfg_reply *reply) 1241{ 1242 int i, ns; 1243 enum drbd_ret_codes retcode; 1244 struct net_conf *new_conf = NULL; 1245 struct crypto_hash *tfm = NULL; 1246 struct crypto_hash *integrity_w_tfm = NULL; 1247 struct crypto_hash *integrity_r_tfm = NULL; 1248 struct hlist_head *new_tl_hash = NULL; 1249 struct hlist_head *new_ee_hash = NULL; 1250 struct drbd_conf *odev; 1251 char hmac_name[CRYPTO_MAX_ALG_NAME]; 1252 void *int_dig_out = NULL; 1253 void *int_dig_in = NULL; 1254 void *int_dig_vv = NULL; 1255 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr; 1256 1257 drbd_reconfig_start(mdev); 1258 1259 if (mdev->state.conn > C_STANDALONE) { 1260 retcode = ERR_NET_CONFIGURED; 1261 goto fail; 1262 } 1263 1264 /* allocation not in the IO path, cqueue thread context */ 1265 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 1266 if (!new_conf) { 1267 retcode = ERR_NOMEM; 1268 goto fail; 1269 } 1270 1271 new_conf->timeout = DRBD_TIMEOUT_DEF; 1272 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF; 1273 new_conf->ping_int = DRBD_PING_INT_DEF; 1274 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF; 1275 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF; 1276 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF; 1277 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF; 1278 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF; 1279 new_conf->ko_count = DRBD_KO_COUNT_DEF; 1280 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF; 1281 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF; 1282 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF; 1283 new_conf->want_lose = 0; 1284 new_conf->two_primaries = 0; 1285 new_conf->wire_protocol = DRBD_PROT_C; 1286 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF; 1287 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF; 1288 1289 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) { 1290 retcode = ERR_MANDATORY_TAG; 1291 goto fail; 1292 } 1293 1294 if (new_conf->two_primaries 1295 && (new_conf->wire_protocol != DRBD_PROT_C)) { 1296 retcode = ERR_NOT_PROTO_C; 1297 goto fail; 1298 } 1299 1300 if (get_ldev(mdev)) { 1301 enum drbd_fencing_p fp = mdev->ldev->dc.fencing; 1302 put_ldev(mdev); 1303 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) { 1304 retcode = ERR_STONITH_AND_PROT_A; 1305 goto fail; 1306 } 1307 } 1308 1309 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) { 1310 retcode = ERR_DISCARD; 1311 goto fail; 1312 } 1313 1314 retcode = NO_ERROR; 1315 1316 new_my_addr = (struct sockaddr *)&new_conf->my_addr; 1317 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr; 1318 for (i = 0; i < minor_count; i++) { 1319 odev = minor_to_mdev(i); 1320 if (!odev || odev == mdev) 1321 continue; 1322 if (get_net_conf(odev)) { 1323 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr; 1324 if (new_conf->my_addr_len == odev->net_conf->my_addr_len && 1325 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len)) 1326 retcode = ERR_LOCAL_ADDR; 1327 1328 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr; 1329 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len && 1330 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len)) 1331 retcode = ERR_PEER_ADDR; 1332 1333 put_net_conf(odev); 1334 if (retcode != NO_ERROR) 1335 goto fail; 1336 } 1337 } 1338 1339 if (new_conf->cram_hmac_alg[0] != 0) { 1340 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", 1341 new_conf->cram_hmac_alg); 1342 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC); 1343 if (IS_ERR(tfm)) { 1344 tfm = NULL; 1345 retcode = ERR_AUTH_ALG; 1346 goto fail; 1347 } 1348 1349 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 1350 retcode = ERR_AUTH_ALG_ND; 1351 goto fail; 1352 } 1353 } 1354 1355 if (new_conf->integrity_alg[0]) { 1356 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1357 if (IS_ERR(integrity_w_tfm)) { 1358 integrity_w_tfm = NULL; 1359 retcode=ERR_INTEGRITY_ALG; 1360 goto fail; 1361 } 1362 1363 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) { 1364 retcode=ERR_INTEGRITY_ALG_ND; 1365 goto fail; 1366 } 1367 1368 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); 1369 if (IS_ERR(integrity_r_tfm)) { 1370 integrity_r_tfm = NULL; 1371 retcode=ERR_INTEGRITY_ALG; 1372 goto fail; 1373 } 1374 } 1375 1376 ns = new_conf->max_epoch_size/8; 1377 if (mdev->tl_hash_s != ns) { 1378 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1379 if (!new_tl_hash) { 1380 retcode = ERR_NOMEM; 1381 goto fail; 1382 } 1383 } 1384 1385 ns = new_conf->max_buffers/8; 1386 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) { 1387 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); 1388 if (!new_ee_hash) { 1389 retcode = ERR_NOMEM; 1390 goto fail; 1391 } 1392 } 1393 1394 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0; 1395 1396 if (integrity_w_tfm) { 1397 i = crypto_hash_digestsize(integrity_w_tfm); 1398 int_dig_out = kmalloc(i, GFP_KERNEL); 1399 if (!int_dig_out) { 1400 retcode = ERR_NOMEM; 1401 goto fail; 1402 } 1403 int_dig_in = kmalloc(i, GFP_KERNEL); 1404 if (!int_dig_in) { 1405 retcode = ERR_NOMEM; 1406 goto fail; 1407 } 1408 int_dig_vv = kmalloc(i, GFP_KERNEL); 1409 if (!int_dig_vv) { 1410 retcode = ERR_NOMEM; 1411 goto fail; 1412 } 1413 } 1414 1415 if (!mdev->bitmap) { 1416 if(drbd_bm_init(mdev)) { 1417 retcode = ERR_NOMEM; 1418 goto fail; 1419 } 1420 } 1421 1422 drbd_flush_workqueue(mdev); 1423 spin_lock_irq(&mdev->req_lock); 1424 if (mdev->net_conf != NULL) { 1425 retcode = ERR_NET_CONFIGURED; 1426 spin_unlock_irq(&mdev->req_lock); 1427 goto fail; 1428 } 1429 mdev->net_conf = new_conf; 1430 1431 mdev->send_cnt = 0; 1432 mdev->recv_cnt = 0; 1433 1434 if (new_tl_hash) { 1435 kfree(mdev->tl_hash); 1436 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8; 1437 mdev->tl_hash = new_tl_hash; 1438 } 1439 1440 if (new_ee_hash) { 1441 kfree(mdev->ee_hash); 1442 mdev->ee_hash_s = mdev->net_conf->max_buffers/8; 1443 mdev->ee_hash = new_ee_hash; 1444 } 1445 1446 crypto_free_hash(mdev->cram_hmac_tfm); 1447 mdev->cram_hmac_tfm = tfm; 1448 1449 crypto_free_hash(mdev->integrity_w_tfm); 1450 mdev->integrity_w_tfm = integrity_w_tfm; 1451 1452 crypto_free_hash(mdev->integrity_r_tfm); 1453 mdev->integrity_r_tfm = integrity_r_tfm; 1454 1455 kfree(mdev->int_dig_out); 1456 kfree(mdev->int_dig_in); 1457 kfree(mdev->int_dig_vv); 1458 mdev->int_dig_out=int_dig_out; 1459 mdev->int_dig_in=int_dig_in; 1460 mdev->int_dig_vv=int_dig_vv; 1461 retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL); 1462 spin_unlock_irq(&mdev->req_lock); 1463 1464 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1465 reply->ret_code = retcode; 1466 drbd_reconfig_done(mdev); 1467 return 0; 1468 1469fail: 1470 kfree(int_dig_out); 1471 kfree(int_dig_in); 1472 kfree(int_dig_vv); 1473 crypto_free_hash(tfm); 1474 crypto_free_hash(integrity_w_tfm); 1475 crypto_free_hash(integrity_r_tfm); 1476 kfree(new_tl_hash); 1477 kfree(new_ee_hash); 1478 kfree(new_conf); 1479 1480 reply->ret_code = retcode; 1481 drbd_reconfig_done(mdev); 1482 return 0; 1483} 1484 1485static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1486 struct drbd_nl_cfg_reply *reply) 1487{ 1488 int retcode; 1489 1490 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED); 1491 1492 if (retcode == SS_NOTHING_TO_DO) 1493 goto done; 1494 else if (retcode == SS_ALREADY_STANDALONE) 1495 goto done; 1496 else if (retcode == SS_PRIMARY_NOP) { 1497 /* Our statche checking code wants to see the peer outdated. */ 1498 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1499 pdsk, D_OUTDATED)); 1500 } else if (retcode == SS_CW_FAILED_BY_PEER) { 1501 /* The peer probably wants to see us outdated. */ 1502 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, 1503 disk, D_OUTDATED), 1504 CS_ORDERED); 1505 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) { 1506 drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 1507 retcode = SS_SUCCESS; 1508 } 1509 } 1510 1511 if (retcode < SS_SUCCESS) 1512 goto fail; 1513 1514 if (wait_event_interruptible(mdev->state_wait, 1515 mdev->state.conn != C_DISCONNECTING)) { 1516 /* Do not test for mdev->state.conn == C_STANDALONE, since 1517 someone else might connect us in the mean time! */ 1518 retcode = ERR_INTR; 1519 goto fail; 1520 } 1521 1522 done: 1523 retcode = NO_ERROR; 1524 fail: 1525 drbd_md_sync(mdev); 1526 reply->ret_code = retcode; 1527 return 0; 1528} 1529 1530void resync_after_online_grow(struct drbd_conf *mdev) 1531{ 1532 int iass; /* I am sync source */ 1533 1534 dev_info(DEV, "Resync of new storage after online grow\n"); 1535 if (mdev->state.role != mdev->state.peer) 1536 iass = (mdev->state.role == R_PRIMARY); 1537 else 1538 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1539 1540 if (iass) 1541 drbd_start_resync(mdev, C_SYNC_SOURCE); 1542 else 1543 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE); 1544} 1545 1546static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1547 struct drbd_nl_cfg_reply *reply) 1548{ 1549 struct resize rs; 1550 int retcode = NO_ERROR; 1551 enum determine_dev_size dd; 1552 enum dds_flags ddsf; 1553 1554 memset(&rs, 0, sizeof(struct resize)); 1555 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) { 1556 retcode = ERR_MANDATORY_TAG; 1557 goto fail; 1558 } 1559 1560 if (mdev->state.conn > C_CONNECTED) { 1561 retcode = ERR_RESIZE_RESYNC; 1562 goto fail; 1563 } 1564 1565 if (mdev->state.role == R_SECONDARY && 1566 mdev->state.peer == R_SECONDARY) { 1567 retcode = ERR_NO_PRIMARY; 1568 goto fail; 1569 } 1570 1571 if (!get_ldev(mdev)) { 1572 retcode = ERR_NO_DISK; 1573 goto fail; 1574 } 1575 1576 if (rs.no_resync && mdev->agreed_pro_version < 93) { 1577 retcode = ERR_NEED_APV_93; 1578 goto fail; 1579 } 1580 1581 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) 1582 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 1583 1584 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size; 1585 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0); 1586 dd = drbd_determin_dev_size(mdev, ddsf); 1587 drbd_md_sync(mdev); 1588 put_ldev(mdev); 1589 if (dd == dev_size_error) { 1590 retcode = ERR_NOMEM_BITMAP; 1591 goto fail; 1592 } 1593 1594 if (mdev->state.conn == C_CONNECTED) { 1595 if (dd == grew) 1596 set_bit(RESIZE_PENDING, &mdev->flags); 1597 1598 drbd_send_uuids(mdev); 1599 drbd_send_sizes(mdev, 1, ddsf); 1600 } 1601 1602 fail: 1603 reply->ret_code = retcode; 1604 return 0; 1605} 1606 1607static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1608 struct drbd_nl_cfg_reply *reply) 1609{ 1610 int retcode = NO_ERROR; 1611 int err; 1612 int ovr; /* online verify running */ 1613 int rsr; /* re-sync running */ 1614 struct crypto_hash *verify_tfm = NULL; 1615 struct crypto_hash *csums_tfm = NULL; 1616 struct syncer_conf sc; 1617 cpumask_var_t new_cpu_mask; 1618 int *rs_plan_s = NULL; 1619 int fifo_size; 1620 1621 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) { 1622 retcode = ERR_NOMEM; 1623 goto fail; 1624 } 1625 1626 if (nlp->flags & DRBD_NL_SET_DEFAULTS) { 1627 memset(&sc, 0, sizeof(struct syncer_conf)); 1628 sc.rate = DRBD_RATE_DEF; 1629 sc.after = DRBD_AFTER_DEF; 1630 sc.al_extents = DRBD_AL_EXTENTS_DEF; 1631 sc.on_no_data = DRBD_ON_NO_DATA_DEF; 1632 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF; 1633 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF; 1634 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF; 1635 sc.c_max_rate = DRBD_C_MAX_RATE_DEF; 1636 sc.c_min_rate = DRBD_C_MIN_RATE_DEF; 1637 } else 1638 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf)); 1639 1640 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) { 1641 retcode = ERR_MANDATORY_TAG; 1642 goto fail; 1643 } 1644 1645 /* re-sync running */ 1646 rsr = ( mdev->state.conn == C_SYNC_SOURCE || 1647 mdev->state.conn == C_SYNC_TARGET || 1648 mdev->state.conn == C_PAUSED_SYNC_S || 1649 mdev->state.conn == C_PAUSED_SYNC_T ); 1650 1651 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) { 1652 retcode = ERR_CSUMS_RESYNC_RUNNING; 1653 goto fail; 1654 } 1655 1656 if (!rsr && sc.csums_alg[0]) { 1657 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC); 1658 if (IS_ERR(csums_tfm)) { 1659 csums_tfm = NULL; 1660 retcode = ERR_CSUMS_ALG; 1661 goto fail; 1662 } 1663 1664 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) { 1665 retcode = ERR_CSUMS_ALG_ND; 1666 goto fail; 1667 } 1668 } 1669 1670 /* online verify running */ 1671 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T); 1672 1673 if (ovr) { 1674 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) { 1675 retcode = ERR_VERIFY_RUNNING; 1676 goto fail; 1677 } 1678 } 1679 1680 if (!ovr && sc.verify_alg[0]) { 1681 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC); 1682 if (IS_ERR(verify_tfm)) { 1683 verify_tfm = NULL; 1684 retcode = ERR_VERIFY_ALG; 1685 goto fail; 1686 } 1687 1688 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) { 1689 retcode = ERR_VERIFY_ALG_ND; 1690 goto fail; 1691 } 1692 } 1693 1694 /* silently ignore cpu mask on UP kernel */ 1695 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) { 1696 err = __bitmap_parse(sc.cpu_mask, 32, 0, 1697 cpumask_bits(new_cpu_mask), nr_cpu_ids); 1698 if (err) { 1699 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err); 1700 retcode = ERR_CPU_MASK_PARSE; 1701 goto fail; 1702 } 1703 } 1704 1705 ERR_IF (sc.rate < 1) sc.rate = 1; 1706 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */ 1707#define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT) 1708 if (sc.al_extents > AL_MAX) { 1709 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX); 1710 sc.al_extents = AL_MAX; 1711 } 1712#undef AL_MAX 1713 1714 /* most sanity checks done, try to assign the new sync-after 1715 * dependency. need to hold the global lock in there, 1716 * to avoid a race in the dependency loop check. */ 1717 retcode = drbd_alter_sa(mdev, sc.after); 1718 if (retcode != NO_ERROR) 1719 goto fail; 1720 1721 fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 1722 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 1723 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 1724 if (!rs_plan_s) { 1725 dev_err(DEV, "kmalloc of fifo_buffer failed"); 1726 retcode = ERR_NOMEM; 1727 goto fail; 1728 } 1729 } 1730 1731 /* ok, assign the rest of it as well. 1732 * lock against receive_SyncParam() */ 1733 spin_lock(&mdev->peer_seq_lock); 1734 mdev->sync_conf = sc; 1735 1736 if (!rsr) { 1737 crypto_free_hash(mdev->csums_tfm); 1738 mdev->csums_tfm = csums_tfm; 1739 csums_tfm = NULL; 1740 } 1741 1742 if (!ovr) { 1743 crypto_free_hash(mdev->verify_tfm); 1744 mdev->verify_tfm = verify_tfm; 1745 verify_tfm = NULL; 1746 } 1747 1748 if (fifo_size != mdev->rs_plan_s.size) { 1749 kfree(mdev->rs_plan_s.values); 1750 mdev->rs_plan_s.values = rs_plan_s; 1751 mdev->rs_plan_s.size = fifo_size; 1752 mdev->rs_planed = 0; 1753 rs_plan_s = NULL; 1754 } 1755 1756 spin_unlock(&mdev->peer_seq_lock); 1757 1758 if (get_ldev(mdev)) { 1759 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); 1760 drbd_al_shrink(mdev); 1761 err = drbd_check_al_size(mdev); 1762 lc_unlock(mdev->act_log); 1763 wake_up(&mdev->al_wait); 1764 1765 put_ldev(mdev); 1766 drbd_md_sync(mdev); 1767 1768 if (err) { 1769 retcode = ERR_NOMEM; 1770 goto fail; 1771 } 1772 } 1773 1774 if (mdev->state.conn >= C_CONNECTED) 1775 drbd_send_sync_param(mdev, &sc); 1776 1777 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) { 1778 cpumask_copy(mdev->cpu_mask, new_cpu_mask); 1779 drbd_calc_cpu_mask(mdev); 1780 mdev->receiver.reset_cpu_mask = 1; 1781 mdev->asender.reset_cpu_mask = 1; 1782 mdev->worker.reset_cpu_mask = 1; 1783 } 1784 1785 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); 1786fail: 1787 kfree(rs_plan_s); 1788 free_cpumask_var(new_cpu_mask); 1789 crypto_free_hash(csums_tfm); 1790 crypto_free_hash(verify_tfm); 1791 reply->ret_code = retcode; 1792 return 0; 1793} 1794 1795static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1796 struct drbd_nl_cfg_reply *reply) 1797{ 1798 int retcode; 1799 1800 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED); 1801 1802 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION) 1803 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1804 1805 while (retcode == SS_NEED_CONNECTION) { 1806 spin_lock_irq(&mdev->req_lock); 1807 if (mdev->state.conn < C_CONNECTED) 1808 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL); 1809 spin_unlock_irq(&mdev->req_lock); 1810 1811 if (retcode != SS_NEED_CONNECTION) 1812 break; 1813 1814 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); 1815 } 1816 1817 reply->ret_code = retcode; 1818 return 0; 1819} 1820 1821static int drbd_bmio_set_susp_al(struct drbd_conf *mdev) 1822{ 1823 int rv; 1824 1825 rv = drbd_bmio_set_n_write(mdev); 1826 drbd_suspend_al(mdev); 1827 return rv; 1828} 1829 1830static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1831 struct drbd_nl_cfg_reply *reply) 1832{ 1833 int retcode; 1834 1835 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED); 1836 1837 if (retcode < SS_SUCCESS) { 1838 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) { 1839 /* The peer will get a resync upon connect anyways. Just make that 1840 into a full resync. */ 1841 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT)); 1842 if (retcode >= SS_SUCCESS) { 1843 /* open coded drbd_bitmap_io() */ 1844 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al, 1845 "set_n_write from invalidate_peer")) 1846 retcode = ERR_IO_MD_DISK; 1847 } 1848 } else 1849 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S)); 1850 } 1851 1852 reply->ret_code = retcode; 1853 return 0; 1854} 1855 1856static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1857 struct drbd_nl_cfg_reply *reply) 1858{ 1859 int retcode = NO_ERROR; 1860 1861 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO) 1862 retcode = ERR_PAUSE_IS_SET; 1863 1864 reply->ret_code = retcode; 1865 return 0; 1866} 1867 1868static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1869 struct drbd_nl_cfg_reply *reply) 1870{ 1871 int retcode = NO_ERROR; 1872 1873 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) 1874 retcode = ERR_PAUSE_IS_CLEAR; 1875 1876 reply->ret_code = retcode; 1877 return 0; 1878} 1879 1880static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1881 struct drbd_nl_cfg_reply *reply) 1882{ 1883 reply->ret_code = drbd_request_state(mdev, NS(susp, 1)); 1884 1885 return 0; 1886} 1887 1888static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1889 struct drbd_nl_cfg_reply *reply) 1890{ 1891 if (test_bit(NEW_CUR_UUID, &mdev->flags)) { 1892 drbd_uuid_new_current(mdev); 1893 clear_bit(NEW_CUR_UUID, &mdev->flags); 1894 drbd_md_sync(mdev); 1895 } 1896 drbd_suspend_io(mdev); 1897 reply->ret_code = drbd_request_state(mdev, NS(susp, 0)); 1898 if (reply->ret_code == SS_SUCCESS) { 1899 if (mdev->state.conn < C_CONNECTED) 1900 tl_clear(mdev); 1901 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED) 1902 tl_restart(mdev, fail_frozen_disk_io); 1903 } 1904 drbd_resume_io(mdev); 1905 1906 return 0; 1907} 1908 1909static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1910 struct drbd_nl_cfg_reply *reply) 1911{ 1912 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED)); 1913 return 0; 1914} 1915 1916static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1917 struct drbd_nl_cfg_reply *reply) 1918{ 1919 unsigned short *tl; 1920 1921 tl = reply->tag_list; 1922 1923 if (get_ldev(mdev)) { 1924 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl); 1925 put_ldev(mdev); 1926 } 1927 1928 if (get_net_conf(mdev)) { 1929 tl = net_conf_to_tags(mdev, mdev->net_conf, tl); 1930 put_net_conf(mdev); 1931 } 1932 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl); 1933 1934 put_unaligned(TT_END, tl++); /* Close the tag list */ 1935 1936 return (int)((char *)tl - (char *)reply->tag_list); 1937} 1938 1939static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1940 struct drbd_nl_cfg_reply *reply) 1941{ 1942 unsigned short *tl = reply->tag_list; 1943 union drbd_state s = mdev->state; 1944 unsigned long rs_left; 1945 unsigned int res; 1946 1947 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl); 1948 1949 /* no local ref, no bitmap, no syncer progress. */ 1950 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) { 1951 if (get_ldev(mdev)) { 1952 drbd_get_syncer_progress(mdev, &rs_left, &res); 1953 tl = tl_add_int(tl, T_sync_progress, &res); 1954 put_ldev(mdev); 1955 } 1956 } 1957 put_unaligned(TT_END, tl++); /* Close the tag list */ 1958 1959 return (int)((char *)tl - (char *)reply->tag_list); 1960} 1961 1962static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1963 struct drbd_nl_cfg_reply *reply) 1964{ 1965 unsigned short *tl; 1966 1967 tl = reply->tag_list; 1968 1969 if (get_ldev(mdev)) { 1970 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64)); 1971 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags); 1972 put_ldev(mdev); 1973 } 1974 put_unaligned(TT_END, tl++); /* Close the tag list */ 1975 1976 return (int)((char *)tl - (char *)reply->tag_list); 1977} 1978 1979/** 1980 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use 1981 * @mdev: DRBD device. 1982 * @nlp: Netlink/connector packet from drbdsetup 1983 * @reply: Reply packet for drbdsetup 1984 */ 1985static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 1986 struct drbd_nl_cfg_reply *reply) 1987{ 1988 unsigned short *tl; 1989 char rv; 1990 1991 tl = reply->tag_list; 1992 1993 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED : 1994 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT; 1995 1996 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv)); 1997 put_unaligned(TT_END, tl++); /* Close the tag list */ 1998 1999 return (int)((char *)tl - (char *)reply->tag_list); 2000} 2001 2002static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2003 struct drbd_nl_cfg_reply *reply) 2004{ 2005 /* default to resume from last known position, if possible */ 2006 struct start_ov args = 2007 { .start_sector = mdev->ov_start_sector }; 2008 2009 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) { 2010 reply->ret_code = ERR_MANDATORY_TAG; 2011 return 0; 2012 } 2013 /* w_make_ov_request expects position to be aligned */ 2014 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT; 2015 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S)); 2016 return 0; 2017} 2018 2019 2020static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 2021 struct drbd_nl_cfg_reply *reply) 2022{ 2023 int retcode = NO_ERROR; 2024 int skip_initial_sync = 0; 2025 int err; 2026 2027 struct new_c_uuid args; 2028 2029 memset(&args, 0, sizeof(struct new_c_uuid)); 2030 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) { 2031 reply->ret_code = ERR_MANDATORY_TAG; 2032 return 0; 2033 } 2034 2035 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */ 2036 2037 if (!get_ldev(mdev)) { 2038 retcode = ERR_NO_DISK; 2039 goto out; 2040 } 2041 2042 /* this is "skip initial sync", assume to be clean */ 2043 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 && 2044 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) { 2045 dev_info(DEV, "Preparing to skip initial sync\n"); 2046 skip_initial_sync = 1; 2047 } else if (mdev->state.conn != C_STANDALONE) { 2048 retcode = ERR_CONNECTED; 2049 goto out_dec; 2050 } 2051 2052 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */ 2053 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */ 2054 2055 if (args.clear_bm) { 2056 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid"); 2057 if (err) { 2058 dev_err(DEV, "Writing bitmap failed with %d\n",err); 2059 retcode = ERR_IO_MD_DISK; 2060 } 2061 if (skip_initial_sync) { 2062 drbd_send_uuids_skip_initial_sync(mdev); 2063 _drbd_uuid_set(mdev, UI_BITMAP, 0); 2064 spin_lock_irq(&mdev->req_lock); 2065 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 2066 CS_VERBOSE, NULL); 2067 spin_unlock_irq(&mdev->req_lock); 2068 } 2069 } 2070 2071 drbd_md_sync(mdev); 2072out_dec: 2073 put_ldev(mdev); 2074out: 2075 mutex_unlock(&mdev->state_mutex); 2076 2077 reply->ret_code = retcode; 2078 return 0; 2079} 2080 2081static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp) 2082{ 2083 struct drbd_conf *mdev; 2084 2085 if (nlp->drbd_minor >= minor_count) 2086 return NULL; 2087 2088 mdev = minor_to_mdev(nlp->drbd_minor); 2089 2090 if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) { 2091 struct gendisk *disk = NULL; 2092 mdev = drbd_new_device(nlp->drbd_minor); 2093 2094 spin_lock_irq(&drbd_pp_lock); 2095 if (minor_table[nlp->drbd_minor] == NULL) { 2096 minor_table[nlp->drbd_minor] = mdev; 2097 disk = mdev->vdisk; 2098 mdev = NULL; 2099 } /* else: we lost the race */ 2100 spin_unlock_irq(&drbd_pp_lock); 2101 2102 if (disk) /* we won the race above */ 2103 /* in case we ever add a drbd_delete_device(), 2104 * don't forget the del_gendisk! */ 2105 add_disk(disk); 2106 else /* we lost the race above */ 2107 drbd_free_mdev(mdev); 2108 2109 mdev = minor_to_mdev(nlp->drbd_minor); 2110 } 2111 2112 return mdev; 2113} 2114 2115struct cn_handler_struct { 2116 int (*function)(struct drbd_conf *, 2117 struct drbd_nl_cfg_req *, 2118 struct drbd_nl_cfg_reply *); 2119 int reply_body_size; 2120}; 2121 2122static struct cn_handler_struct cnd_table[] = { 2123 [ P_primary ] = { &drbd_nl_primary, 0 }, 2124 [ P_secondary ] = { &drbd_nl_secondary, 0 }, 2125 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 }, 2126 [ P_detach ] = { &drbd_nl_detach, 0 }, 2127 [ P_net_conf ] = { &drbd_nl_net_conf, 0 }, 2128 [ P_disconnect ] = { &drbd_nl_disconnect, 0 }, 2129 [ P_resize ] = { &drbd_nl_resize, 0 }, 2130 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 }, 2131 [ P_invalidate ] = { &drbd_nl_invalidate, 0 }, 2132 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 }, 2133 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 }, 2134 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 }, 2135 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 }, 2136 [ P_resume_io ] = { &drbd_nl_resume_io, 0 }, 2137 [ P_outdate ] = { &drbd_nl_outdate, 0 }, 2138 [ P_get_config ] = { &drbd_nl_get_config, 2139 sizeof(struct syncer_conf_tag_len_struct) + 2140 sizeof(struct disk_conf_tag_len_struct) + 2141 sizeof(struct net_conf_tag_len_struct) }, 2142 [ P_get_state ] = { &drbd_nl_get_state, 2143 sizeof(struct get_state_tag_len_struct) + 2144 sizeof(struct sync_progress_tag_len_struct) }, 2145 [ P_get_uuids ] = { &drbd_nl_get_uuids, 2146 sizeof(struct get_uuids_tag_len_struct) }, 2147 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag, 2148 sizeof(struct get_timeout_flag_tag_len_struct)}, 2149 [ P_start_ov ] = { &drbd_nl_start_ov, 0 }, 2150 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 }, 2151}; 2152 2153static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp) 2154{ 2155 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data; 2156 struct cn_handler_struct *cm; 2157 struct cn_msg *cn_reply; 2158 struct drbd_nl_cfg_reply *reply; 2159 struct drbd_conf *mdev; 2160 int retcode, rr; 2161 int reply_size = sizeof(struct cn_msg) 2162 + sizeof(struct drbd_nl_cfg_reply) 2163 + sizeof(short int); 2164 2165 if (!try_module_get(THIS_MODULE)) { 2166 printk(KERN_ERR "drbd: try_module_get() failed!\n"); 2167 return; 2168 } 2169 2170 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) { 2171 retcode = ERR_PERM; 2172 goto fail; 2173 } 2174 2175 mdev = ensure_mdev(nlp); 2176 if (!mdev) { 2177 retcode = ERR_MINOR_INVALID; 2178 goto fail; 2179 } 2180 2181 if (nlp->packet_type >= P_nl_after_last_packet) { 2182 retcode = ERR_PACKET_NR; 2183 goto fail; 2184 } 2185 2186 cm = cnd_table + nlp->packet_type; 2187 2188 /* This may happen if packet number is 0: */ 2189 if (cm->function == NULL) { 2190 retcode = ERR_PACKET_NR; 2191 goto fail; 2192 } 2193 2194 reply_size += cm->reply_body_size; 2195 2196 /* allocation not in the IO path, cqueue thread context */ 2197 cn_reply = kmalloc(reply_size, GFP_KERNEL); 2198 if (!cn_reply) { 2199 retcode = ERR_NOMEM; 2200 goto fail; 2201 } 2202 reply = (struct drbd_nl_cfg_reply *) cn_reply->data; 2203 2204 reply->packet_type = 2205 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet; 2206 reply->minor = nlp->drbd_minor; 2207 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */ 2208 /* reply->tag_list; might be modified by cm->function. */ 2209 2210 rr = cm->function(mdev, nlp, reply); 2211 2212 cn_reply->id = req->id; 2213 cn_reply->seq = req->seq; 2214 cn_reply->ack = req->ack + 1; 2215 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr; 2216 cn_reply->flags = 0; 2217 2218 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL); 2219 if (rr && rr != -ESRCH) 2220 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2221 2222 kfree(cn_reply); 2223 module_put(THIS_MODULE); 2224 return; 2225 fail: 2226 drbd_nl_send_reply(req, retcode); 2227 module_put(THIS_MODULE); 2228} 2229 2230static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */ 2231 2232static unsigned short * 2233__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, 2234 unsigned short len, int nul_terminated) 2235{ 2236 unsigned short l = tag_descriptions[tag_number(tag)].max_len; 2237 len = (len < l) ? len : l; 2238 put_unaligned(tag, tl++); 2239 put_unaligned(len, tl++); 2240 memcpy(tl, data, len); 2241 tl = (unsigned short*)((char*)tl + len); 2242 if (nul_terminated) 2243 *((char*)tl - 1) = 0; 2244 return tl; 2245} 2246 2247static unsigned short * 2248tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len) 2249{ 2250 return __tl_add_blob(tl, tag, data, len, 0); 2251} 2252 2253static unsigned short * 2254tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str) 2255{ 2256 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0); 2257} 2258 2259static unsigned short * 2260tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val) 2261{ 2262 put_unaligned(tag, tl++); 2263 switch(tag_type(tag)) { 2264 case TT_INTEGER: 2265 put_unaligned(sizeof(int), tl++); 2266 put_unaligned(*(int *)val, (int *)tl); 2267 tl = (unsigned short*)((char*)tl+sizeof(int)); 2268 break; 2269 case TT_INT64: 2270 put_unaligned(sizeof(u64), tl++); 2271 put_unaligned(*(u64 *)val, (u64 *)tl); 2272 tl = (unsigned short*)((char*)tl+sizeof(u64)); 2273 break; 2274 default: 2275 /* someone did something stupid. */ 2276 ; 2277 } 2278 return tl; 2279} 2280 2281void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state) 2282{ 2283 char buffer[sizeof(struct cn_msg)+ 2284 sizeof(struct drbd_nl_cfg_reply)+ 2285 sizeof(struct get_state_tag_len_struct)+ 2286 sizeof(short int)]; 2287 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2288 struct drbd_nl_cfg_reply *reply = 2289 (struct drbd_nl_cfg_reply *)cn_reply->data; 2290 unsigned short *tl = reply->tag_list; 2291 2292 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2293 2294 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl); 2295 2296 put_unaligned(TT_END, tl++); /* Close the tag list */ 2297 2298 cn_reply->id.idx = CN_IDX_DRBD; 2299 cn_reply->id.val = CN_VAL_DRBD; 2300 2301 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2302 cn_reply->ack = 0; /* not used here. */ 2303 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2304 (int)((char *)tl - (char *)reply->tag_list); 2305 cn_reply->flags = 0; 2306 2307 reply->packet_type = P_get_state; 2308 reply->minor = mdev_to_minor(mdev); 2309 reply->ret_code = NO_ERROR; 2310 2311 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2312} 2313 2314void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name) 2315{ 2316 char buffer[sizeof(struct cn_msg)+ 2317 sizeof(struct drbd_nl_cfg_reply)+ 2318 sizeof(struct call_helper_tag_len_struct)+ 2319 sizeof(short int)]; 2320 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2321 struct drbd_nl_cfg_reply *reply = 2322 (struct drbd_nl_cfg_reply *)cn_reply->data; 2323 unsigned short *tl = reply->tag_list; 2324 2325 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ 2326 2327 tl = tl_add_str(tl, T_helper, helper_name); 2328 put_unaligned(TT_END, tl++); /* Close the tag list */ 2329 2330 cn_reply->id.idx = CN_IDX_DRBD; 2331 cn_reply->id.val = CN_VAL_DRBD; 2332 2333 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2334 cn_reply->ack = 0; /* not used here. */ 2335 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2336 (int)((char *)tl - (char *)reply->tag_list); 2337 cn_reply->flags = 0; 2338 2339 reply->packet_type = P_call_helper; 2340 reply->minor = mdev_to_minor(mdev); 2341 reply->ret_code = NO_ERROR; 2342 2343 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2344} 2345 2346void drbd_bcast_ee(struct drbd_conf *mdev, 2347 const char *reason, const int dgs, 2348 const char* seen_hash, const char* calc_hash, 2349 const struct drbd_epoch_entry* e) 2350{ 2351 struct cn_msg *cn_reply; 2352 struct drbd_nl_cfg_reply *reply; 2353 unsigned short *tl; 2354 struct page *page; 2355 unsigned len; 2356 2357 if (!e) 2358 return; 2359 if (!reason || !reason[0]) 2360 return; 2361 2362 /* apparently we have to memcpy twice, first to prepare the data for the 2363 * struct cn_msg, then within cn_netlink_send from the cn_msg to the 2364 * netlink skb. */ 2365 /* receiver thread context, which is not in the writeout path (of this node), 2366 * but may be in the writeout path of the _other_ node. 2367 * GFP_NOIO to avoid potential "distributed deadlock". */ 2368 cn_reply = kmalloc( 2369 sizeof(struct cn_msg)+ 2370 sizeof(struct drbd_nl_cfg_reply)+ 2371 sizeof(struct dump_ee_tag_len_struct)+ 2372 sizeof(short int), 2373 GFP_NOIO); 2374 2375 if (!cn_reply) { 2376 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n", 2377 (unsigned long long)e->sector, e->size); 2378 return; 2379 } 2380 2381 reply = (struct drbd_nl_cfg_reply*)cn_reply->data; 2382 tl = reply->tag_list; 2383 2384 tl = tl_add_str(tl, T_dump_ee_reason, reason); 2385 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs); 2386 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs); 2387 tl = tl_add_int(tl, T_ee_sector, &e->sector); 2388 tl = tl_add_int(tl, T_ee_block_id, &e->block_id); 2389 2390 put_unaligned(T_ee_data, tl++); 2391 put_unaligned(e->size, tl++); 2392 2393 len = e->size; 2394 page = e->pages; 2395 page_chain_for_each(page) { 2396 void *d = kmap_atomic(page, KM_USER0); 2397 unsigned l = min_t(unsigned, len, PAGE_SIZE); 2398 memcpy(tl, d, l); 2399 kunmap_atomic(d, KM_USER0); 2400 tl = (unsigned short*)((char*)tl + l); 2401 len -= l; 2402 } 2403 put_unaligned(TT_END, tl++); /* Close the tag list */ 2404 2405 cn_reply->id.idx = CN_IDX_DRBD; 2406 cn_reply->id.val = CN_VAL_DRBD; 2407 2408 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq); 2409 cn_reply->ack = 0; // not used here. 2410 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2411 (int)((char*)tl - (char*)reply->tag_list); 2412 cn_reply->flags = 0; 2413 2414 reply->packet_type = P_dump_ee; 2415 reply->minor = mdev_to_minor(mdev); 2416 reply->ret_code = NO_ERROR; 2417 2418 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2419 kfree(cn_reply); 2420} 2421 2422void drbd_bcast_sync_progress(struct drbd_conf *mdev) 2423{ 2424 char buffer[sizeof(struct cn_msg)+ 2425 sizeof(struct drbd_nl_cfg_reply)+ 2426 sizeof(struct sync_progress_tag_len_struct)+ 2427 sizeof(short int)]; 2428 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2429 struct drbd_nl_cfg_reply *reply = 2430 (struct drbd_nl_cfg_reply *)cn_reply->data; 2431 unsigned short *tl = reply->tag_list; 2432 unsigned long rs_left; 2433 unsigned int res; 2434 2435 /* no local ref, no bitmap, no syncer progress, no broadcast. */ 2436 if (!get_ldev(mdev)) 2437 return; 2438 drbd_get_syncer_progress(mdev, &rs_left, &res); 2439 put_ldev(mdev); 2440 2441 tl = tl_add_int(tl, T_sync_progress, &res); 2442 put_unaligned(TT_END, tl++); /* Close the tag list */ 2443 2444 cn_reply->id.idx = CN_IDX_DRBD; 2445 cn_reply->id.val = CN_VAL_DRBD; 2446 2447 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); 2448 cn_reply->ack = 0; /* not used here. */ 2449 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + 2450 (int)((char *)tl - (char *)reply->tag_list); 2451 cn_reply->flags = 0; 2452 2453 reply->packet_type = P_sync_progress; 2454 reply->minor = mdev_to_minor(mdev); 2455 reply->ret_code = NO_ERROR; 2456 2457 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2458} 2459 2460int __init drbd_nl_init(void) 2461{ 2462 static struct cb_id cn_id_drbd; 2463 int err, try=10; 2464 2465 cn_id_drbd.val = CN_VAL_DRBD; 2466 do { 2467 cn_id_drbd.idx = cn_idx; 2468 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback); 2469 if (!err) 2470 break; 2471 cn_idx = (cn_idx + CN_IDX_STEP); 2472 } while (try--); 2473 2474 if (err) { 2475 printk(KERN_ERR "drbd: cn_drbd failed to register\n"); 2476 return err; 2477 } 2478 2479 return 0; 2480} 2481 2482void drbd_nl_cleanup(void) 2483{ 2484 static struct cb_id cn_id_drbd; 2485 2486 cn_id_drbd.idx = cn_idx; 2487 cn_id_drbd.val = CN_VAL_DRBD; 2488 2489 cn_del_callback(&cn_id_drbd); 2490} 2491 2492void drbd_nl_send_reply(struct cn_msg *req, int ret_code) 2493{ 2494 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)]; 2495 struct cn_msg *cn_reply = (struct cn_msg *) buffer; 2496 struct drbd_nl_cfg_reply *reply = 2497 (struct drbd_nl_cfg_reply *)cn_reply->data; 2498 int rr; 2499 2500 cn_reply->id = req->id; 2501 2502 cn_reply->seq = req->seq; 2503 cn_reply->ack = req->ack + 1; 2504 cn_reply->len = sizeof(struct drbd_nl_cfg_reply); 2505 cn_reply->flags = 0; 2506 2507 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor; 2508 reply->ret_code = ret_code; 2509 2510 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); 2511 if (rr && rr != -ESRCH) 2512 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); 2513} 2514 2515