drivers/block/drbd/drbd_nl.c

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