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) < min_md_device_sectors) {
 898                 retcode = ERR_MD_DISK_TO_SMALL;
 899                 dev_warn(DEV, "refusing attach: md-device too small, "
 900                      "at least %llu sectors needed for this meta-disk type\n",
 901                      (unsigned long long) min_md_device_sectors);
 902                 goto release_bdev2_fail;
 903         }
 904
 905         /* Make sure the new disk is big enough
 906          * (we may currently be R_PRIMARY with no local disk...) */
 907         if (drbd_get_max_capacity(nbc) <
 908             drbd_get_capacity(mdev->this_bdev)) {
 909                 retcode = ERR_DISK_TO_SMALL;
 910                 goto release_bdev2_fail;
 911         }
 912
 913         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
 914
 915         if (nbc->known_size > max_possible_sectors) {
 916                 dev_warn(DEV, "==> truncating very big lower level device "
 917                         "to currently maximum possible %llu sectors <==\n",
 918                         (unsigned long long) max_possible_sectors);
 919                 if (nbc->dc.meta_dev_idx >= 0)
 920                         dev_warn(DEV, "==>> using internal or flexible "
 921                                       "meta data may help <<==\n");
 922         }
 923
 924         drbd_suspend_io(mdev);
 925         /* also wait for the last barrier ack. */
 926         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt));
 927         /* and for any other previously queued work */
 928         drbd_flush_workqueue(mdev);
 929
 930         retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
 931         drbd_resume_io(mdev);
 932         if (retcode < SS_SUCCESS)
 933                 goto release_bdev2_fail;
 934
 935         if (!get_ldev_if_state(mdev, D_ATTACHING))
 936                 goto force_diskless;
 937
 938         drbd_md_set_sector_offsets(mdev, nbc);
 939
 940         if (!mdev->bitmap) {
 941                 if (drbd_bm_init(mdev)) {
 942                         retcode = ERR_NOMEM;
 943                         goto force_diskless_dec;
 944                 }
 945         }
 946
 947         retcode = drbd_md_read(mdev, nbc);
 948         if (retcode != NO_ERROR)
 949                 goto force_diskless_dec;
 950
 951         if (mdev->state.conn < C_CONNECTED &&
 952             mdev->state.role == R_PRIMARY &&
 953             (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
 954                 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
 955                     (unsigned long long)mdev->ed_uuid);
 956                 retcode = ERR_DATA_NOT_CURRENT;
 957                 goto force_diskless_dec;
 958         }
 959
 960         /* Since we are diskless, fix the activity log first... */
 961         if (drbd_check_al_size(mdev)) {
 962                 retcode = ERR_NOMEM;
 963                 goto force_diskless_dec;
 964         }
 965
 966         /* Prevent shrinking of consistent devices ! */
 967         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
 968            drbd_new_dev_size(mdev, nbc) < nbc->md.la_size_sect) {
 969                 dev_warn(DEV, "refusing to truncate a consistent device\n");
 970                 retcode = ERR_DISK_TO_SMALL;
 971                 goto force_diskless_dec;
 972         }
 973
 974         if (!drbd_al_read_log(mdev, nbc)) {
 975                 retcode = ERR_IO_MD_DISK;
 976                 goto force_diskless_dec;
 977         }
 978
 979         /* allocate a second IO page if logical_block_size != 512 */
 980         logical_block_size = bdev_logical_block_size(nbc->md_bdev);
 981         if (logical_block_size == 0)
 982                 logical_block_size = MD_SECTOR_SIZE;
 983
 984         if (logical_block_size != MD_SECTOR_SIZE) {
 985                 if (!mdev->md_io_tmpp) {
 986                         struct page *page = alloc_page(GFP_NOIO);
 987                         if (!page)
 988                                 goto force_diskless_dec;
 989
 990                         dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
 991                              logical_block_size, MD_SECTOR_SIZE);
 992                         dev_warn(DEV, "Workaround engaged (has performance impact).\n");
 993
 994                         mdev->md_io_tmpp = page;
 995                 }
 996         }
 997
 998         /* Reset the "barriers don't work" bits here, then force meta data to
 999          * be written, to ensure we determine if barriers are supported. */
1000         if (nbc->dc.no_md_flush)
1001                 set_bit(MD_NO_BARRIER, &mdev->flags);
1002         else
1003                 clear_bit(MD_NO_BARRIER, &mdev->flags);
1004
1005         /* Point of no return reached.
1006          * Devices and memory are no longer released by error cleanup below.
1007          * now mdev takes over responsibility, and the state engine should
1008          * clean it up somewhere.  */
1009         D_ASSERT(mdev->ldev == NULL);
1010         mdev->ldev = nbc;
1011         mdev->resync = resync_lru;
1012         nbc = NULL;
1013         resync_lru = NULL;
1014
1015         mdev->write_ordering = WO_bio_barrier;
1016         drbd_bump_write_ordering(mdev, WO_bio_barrier);
1017
1018         if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1019                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1020         else
1021                 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1022
1023         if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND)) {
1024                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1025                 cp_discovered = 1;
1026         }
1027
1028         mdev->send_cnt = 0;
1029         mdev->recv_cnt = 0;
1030         mdev->read_cnt = 0;
1031         mdev->writ_cnt = 0;
1032
1033         drbd_setup_queue_param(mdev, DRBD_MAX_SEGMENT_SIZE);
1034
1035         /* If I am currently not R_PRIMARY,
1036          * but meta data primary indicator is set,
1037          * I just now recover from a hard crash,
1038          * and have been R_PRIMARY before that crash.
1039          *
1040          * Now, if I had no connection before that crash
1041          * (have been degraded R_PRIMARY), chances are that
1042          * I won't find my peer now either.
1043          *
1044          * In that case, and _only_ in that case,
1045          * we use the degr-wfc-timeout instead of the default,
1046          * so we can automatically recover from a crash of a
1047          * degraded but active "cluster" after a certain timeout.
1048          */
1049         clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1050         if (mdev->state.role != R_PRIMARY &&
1051              drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1052             !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1053                 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1054
1055         dd = drbd_determin_dev_size(mdev);
1056         if (dd == dev_size_error) {
1057                 retcode = ERR_NOMEM_BITMAP;
1058                 goto force_diskless_dec;
1059         } else if (dd == grew)
1060                 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1061
1062         if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1063                 dev_info(DEV, "Assuming that all blocks are out of sync "
1064                      "(aka FullSync)\n");
1065                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) {
1066                         retcode = ERR_IO_MD_DISK;
1067                         goto force_diskless_dec;
1068                 }
1069         } else {
1070                 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
1071                         retcode = ERR_IO_MD_DISK;
1072                         goto force_diskless_dec;
1073                 }
1074         }
1075
1076         if (cp_discovered) {
1077                 drbd_al_apply_to_bm(mdev);
1078                 drbd_al_to_on_disk_bm(mdev);
1079         }
1080
1081         spin_lock_irq(&mdev->req_lock);
1082         os = mdev->state;
1083         ns.i = os.i;
1084         /* If MDF_CONSISTENT is not set go into inconsistent state,
1085            otherwise investigate MDF_WasUpToDate...
1086            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1087            otherwise into D_CONSISTENT state.
1088         */
1089         if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1090                 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1091                         ns.disk = D_CONSISTENT;
1092                 else
1093                         ns.disk = D_OUTDATED;
1094         } else {
1095                 ns.disk = D_INCONSISTENT;
1096         }
1097
1098         if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1099                 ns.pdsk = D_OUTDATED;
1100
1101         if ( ns.disk == D_CONSISTENT &&
1102             (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1103                 ns.disk = D_UP_TO_DATE;
1104
1105         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1106            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1107            this point, because drbd_request_state() modifies these
1108            flags. */
1109
1110         /* In case we are C_CONNECTED postpone any decision on the new disk
1111            state after the negotiation phase. */
1112         if (mdev->state.conn == C_CONNECTED) {
1113                 mdev->new_state_tmp.i = ns.i;
1114                 ns.i = os.i;
1115                 ns.disk = D_NEGOTIATING;
1116         }
1117
1118         rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1119         ns = mdev->state;
1120         spin_unlock_irq(&mdev->req_lock);
1121
1122         if (rv < SS_SUCCESS)
1123                 goto force_diskless_dec;
1124
1125         if (mdev->state.role == R_PRIMARY)
1126                 mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1127         else
1128                 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1129
1130         drbd_md_mark_dirty(mdev);
1131         drbd_md_sync(mdev);
1132
1133         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1134         put_ldev(mdev);
1135         reply->ret_code = retcode;
1136         drbd_reconfig_done(mdev);
1137         return 0;
1138
1139  force_diskless_dec:
1140         put_ldev(mdev);
1141  force_diskless:
1142         drbd_force_state(mdev, NS(disk, D_DISKLESS));
1143         drbd_md_sync(mdev);
1144  release_bdev2_fail:
1145         if (nbc)
1146                 bd_release(nbc->md_bdev);
1147  release_bdev_fail:
1148         if (nbc)
1149                 bd_release(nbc->backing_bdev);
1150  fail:
1151         if (nbc) {
1152                 if (nbc->lo_file)
1153                         fput(nbc->lo_file);
1154                 if (nbc->md_file)
1155                         fput(nbc->md_file);
1156                 kfree(nbc);
1157         }
1158         lc_destroy(resync_lru);
1159
1160         reply->ret_code = retcode;
1161         drbd_reconfig_done(mdev);
1162         return 0;
1163 }
1164
1165 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1166                           struct drbd_nl_cfg_reply *reply)
1167 {
1168         reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
1169         return 0;
1170 }
1171
1172 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1173                             struct drbd_nl_cfg_reply *reply)
1174 {
1175         int i, ns;
1176         enum drbd_ret_codes retcode;
1177         struct net_conf *new_conf = NULL;
1178         struct crypto_hash *tfm = NULL;
1179         struct crypto_hash *integrity_w_tfm = NULL;
1180         struct crypto_hash *integrity_r_tfm = NULL;
1181         struct hlist_head *new_tl_hash = NULL;
1182         struct hlist_head *new_ee_hash = NULL;
1183         struct drbd_conf *odev;
1184         char hmac_name[CRYPTO_MAX_ALG_NAME];
1185         void *int_dig_out = NULL;
1186         void *int_dig_in = NULL;
1187         void *int_dig_vv = NULL;
1188         struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1189
1190         drbd_reconfig_start(mdev);
1191
1192         if (mdev->state.conn > C_STANDALONE) {
1193                 retcode = ERR_NET_CONFIGURED;
1194                 goto fail;
1195         }
1196
1197         /* allocation not in the IO path, cqueue thread context */
1198         new_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL);
1199         if (!new_conf) {
1200                 retcode = ERR_NOMEM;
1201                 goto fail;
1202         }
1203
1204         memset(new_conf, 0, sizeof(struct net_conf));
1205         new_conf->timeout          = DRBD_TIMEOUT_DEF;
1206         new_conf->try_connect_int  = DRBD_CONNECT_INT_DEF;
1207         new_conf->ping_int         = DRBD_PING_INT_DEF;
1208         new_conf->max_epoch_size   = DRBD_MAX_EPOCH_SIZE_DEF;
1209         new_conf->max_buffers      = DRBD_MAX_BUFFERS_DEF;
1210         new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1211         new_conf->sndbuf_size      = DRBD_SNDBUF_SIZE_DEF;
1212         new_conf->rcvbuf_size      = DRBD_RCVBUF_SIZE_DEF;
1213         new_conf->ko_count         = DRBD_KO_COUNT_DEF;
1214         new_conf->after_sb_0p      = DRBD_AFTER_SB_0P_DEF;
1215         new_conf->after_sb_1p      = DRBD_AFTER_SB_1P_DEF;
1216         new_conf->after_sb_2p      = DRBD_AFTER_SB_2P_DEF;
1217         new_conf->want_lose        = 0;
1218         new_conf->two_primaries    = 0;
1219         new_conf->wire_protocol    = DRBD_PROT_C;
1220         new_conf->ping_timeo       = DRBD_PING_TIMEO_DEF;
1221         new_conf->rr_conflict      = DRBD_RR_CONFLICT_DEF;
1222
1223         if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1224                 retcode = ERR_MANDATORY_TAG;
1225                 goto fail;
1226         }
1227
1228         if (new_conf->two_primaries
1229             && (new_conf->wire_protocol != DRBD_PROT_C)) {
1230                 retcode = ERR_NOT_PROTO_C;
1231                 goto fail;
1232         };
1233
1234         if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1235                 retcode = ERR_DISCARD;
1236                 goto fail;
1237         }
1238
1239         retcode = NO_ERROR;
1240
1241         new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1242         new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1243         for (i = 0; i < minor_count; i++) {
1244                 odev = minor_to_mdev(i);
1245                 if (!odev || odev == mdev)
1246                         continue;
1247                 if (get_net_conf(odev)) {
1248                         taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1249                         if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1250                             !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1251                                 retcode = ERR_LOCAL_ADDR;
1252
1253                         taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1254                         if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1255                             !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1256                                 retcode = ERR_PEER_ADDR;
1257
1258                         put_net_conf(odev);
1259                         if (retcode != NO_ERROR)
1260                                 goto fail;
1261                 }
1262         }
1263
1264         if (new_conf->cram_hmac_alg[0] != 0) {
1265                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1266                         new_conf->cram_hmac_alg);
1267                 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1268                 if (IS_ERR(tfm)) {
1269                         tfm = NULL;
1270                         retcode = ERR_AUTH_ALG;
1271                         goto fail;
1272                 }
1273
1274                 if (crypto_tfm_alg_type(crypto_hash_tfm(tfm))
1275                                                 != CRYPTO_ALG_TYPE_HASH) {
1276                         retcode = ERR_AUTH_ALG_ND;
1277                         goto fail;
1278                 }
1279         }
1280
1281         if (new_conf->integrity_alg[0]) {
1282                 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1283                 if (IS_ERR(integrity_w_tfm)) {
1284                         integrity_w_tfm = NULL;
1285                         retcode=ERR_INTEGRITY_ALG;
1286                         goto fail;
1287                 }
1288
1289                 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1290                         retcode=ERR_INTEGRITY_ALG_ND;
1291                         goto fail;
1292                 }
1293
1294                 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1295                 if (IS_ERR(integrity_r_tfm)) {
1296                         integrity_r_tfm = NULL;
1297                         retcode=ERR_INTEGRITY_ALG;
1298                         goto fail;
1299                 }
1300         }
1301
1302         ns = new_conf->max_epoch_size/8;
1303         if (mdev->tl_hash_s != ns) {
1304                 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1305                 if (!new_tl_hash) {
1306                         retcode = ERR_NOMEM;
1307                         goto fail;
1308                 }
1309         }
1310
1311         ns = new_conf->max_buffers/8;
1312         if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1313                 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1314                 if (!new_ee_hash) {
1315                         retcode = ERR_NOMEM;
1316                         goto fail;
1317                 }
1318         }
1319
1320         ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1321
1322         if (integrity_w_tfm) {
1323                 i = crypto_hash_digestsize(integrity_w_tfm);
1324                 int_dig_out = kmalloc(i, GFP_KERNEL);
1325                 if (!int_dig_out) {
1326                         retcode = ERR_NOMEM;
1327                         goto fail;
1328                 }
1329                 int_dig_in = kmalloc(i, GFP_KERNEL);
1330                 if (!int_dig_in) {
1331                         retcode = ERR_NOMEM;
1332                         goto fail;
1333                 }
1334                 int_dig_vv = kmalloc(i, GFP_KERNEL);
1335                 if (!int_dig_vv) {
1336                         retcode = ERR_NOMEM;
1337                         goto fail;
1338                 }
1339         }
1340
1341         if (!mdev->bitmap) {
1342                 if(drbd_bm_init(mdev)) {
1343                         retcode = ERR_NOMEM;
1344                         goto fail;
1345                 }
1346         }
1347
1348         spin_lock_irq(&mdev->req_lock);
1349         if (mdev->net_conf != NULL) {
1350                 retcode = ERR_NET_CONFIGURED;
1351                 spin_unlock_irq(&mdev->req_lock);
1352                 goto fail;
1353         }
1354         mdev->net_conf = new_conf;
1355
1356         mdev->send_cnt = 0;
1357         mdev->recv_cnt = 0;
1358
1359         if (new_tl_hash) {
1360                 kfree(mdev->tl_hash);
1361                 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1362                 mdev->tl_hash = new_tl_hash;
1363         }
1364
1365         if (new_ee_hash) {
1366                 kfree(mdev->ee_hash);
1367                 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1368                 mdev->ee_hash = new_ee_hash;
1369         }
1370
1371         crypto_free_hash(mdev->cram_hmac_tfm);
1372         mdev->cram_hmac_tfm = tfm;
1373
1374         crypto_free_hash(mdev->integrity_w_tfm);
1375         mdev->integrity_w_tfm = integrity_w_tfm;
1376
1377         crypto_free_hash(mdev->integrity_r_tfm);
1378         mdev->integrity_r_tfm = integrity_r_tfm;
1379
1380         kfree(mdev->int_dig_out);
1381         kfree(mdev->int_dig_in);
1382         kfree(mdev->int_dig_vv);
1383         mdev->int_dig_out=int_dig_out;
1384         mdev->int_dig_in=int_dig_in;
1385         mdev->int_dig_vv=int_dig_vv;
1386         spin_unlock_irq(&mdev->req_lock);
1387
1388         retcode = _drbd_request_state(mdev, NS(conn, C_UNCONNECTED), CS_VERBOSE);
1389
1390         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1391         reply->ret_code = retcode;
1392         drbd_reconfig_done(mdev);
1393         return 0;
1394
1395 fail:
1396         kfree(int_dig_out);
1397         kfree(int_dig_in);
1398         kfree(int_dig_vv);
1399         crypto_free_hash(tfm);
1400         crypto_free_hash(integrity_w_tfm);
1401         crypto_free_hash(integrity_r_tfm);
1402         kfree(new_tl_hash);
1403         kfree(new_ee_hash);
1404         kfree(new_conf);
1405
1406         reply->ret_code = retcode;
1407         drbd_reconfig_done(mdev);
1408         return 0;
1409 }
1410
1411 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1412                               struct drbd_nl_cfg_reply *reply)
1413 {
1414         int retcode;
1415
1416         retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1417
1418         if (retcode == SS_NOTHING_TO_DO)
1419                 goto done;
1420         else if (retcode == SS_ALREADY_STANDALONE)
1421                 goto done;
1422         else if (retcode == SS_PRIMARY_NOP) {
1423                 /* Our statche checking code wants to see the peer outdated. */
1424                 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1425                                                       pdsk, D_OUTDATED));
1426         } else if (retcode == SS_CW_FAILED_BY_PEER) {
1427                 /* The peer probably wants to see us outdated. */
1428                 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1429                                                         disk, D_OUTDATED),
1430                                               CS_ORDERED);
1431                 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1432                         drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1433                         retcode = SS_SUCCESS;
1434                 }
1435         }
1436
1437         if (retcode < SS_SUCCESS)
1438                 goto fail;
1439
1440         if (wait_event_interruptible(mdev->state_wait,
1441                                      mdev->state.conn != C_DISCONNECTING)) {
1442                 /* Do not test for mdev->state.conn == C_STANDALONE, since
1443                    someone else might connect us in the mean time! */
1444                 retcode = ERR_INTR;
1445                 goto fail;
1446         }
1447
1448  done:
1449         retcode = NO_ERROR;
1450  fail:
1451         drbd_md_sync(mdev);
1452         reply->ret_code = retcode;
1453         return 0;
1454 }
1455
1456 void resync_after_online_grow(struct drbd_conf *mdev)
1457 {
1458         int iass; /* I am sync source */
1459
1460         dev_info(DEV, "Resync of new storage after online grow\n");
1461         if (mdev->state.role != mdev->state.peer)
1462                 iass = (mdev->state.role == R_PRIMARY);
1463         else
1464                 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1465
1466         if (iass)
1467                 drbd_start_resync(mdev, C_SYNC_SOURCE);
1468         else
1469                 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1470 }
1471
1472 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1473                           struct drbd_nl_cfg_reply *reply)
1474 {
1475         struct resize rs;
1476         int retcode = NO_ERROR;
1477         int ldsc = 0; /* local disk size changed */
1478         enum determine_dev_size dd;
1479
1480         memset(&rs, 0, sizeof(struct resize));
1481         if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1482                 retcode = ERR_MANDATORY_TAG;
1483                 goto fail;
1484         }
1485
1486         if (mdev->state.conn > C_CONNECTED) {
1487                 retcode = ERR_RESIZE_RESYNC;
1488                 goto fail;
1489         }
1490
1491         if (mdev->state.role == R_SECONDARY &&
1492             mdev->state.peer == R_SECONDARY) {
1493                 retcode = ERR_NO_PRIMARY;
1494                 goto fail;
1495         }
1496
1497         if (!get_ldev(mdev)) {
1498                 retcode = ERR_NO_DISK;
1499                 goto fail;
1500         }
1501
1502         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) {
1503                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
1504                 ldsc = 1;
1505         }
1506
1507         mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
1508         dd = drbd_determin_dev_size(mdev);
1509         drbd_md_sync(mdev);
1510         put_ldev(mdev);
1511         if (dd == dev_size_error) {
1512                 retcode = ERR_NOMEM_BITMAP;
1513                 goto fail;
1514         }
1515
1516         if (mdev->state.conn == C_CONNECTED && (dd != unchanged || ldsc)) {
1517                 if (dd == grew)
1518                         set_bit(RESIZE_PENDING, &mdev->flags);
1519
1520                 drbd_send_uuids(mdev);
1521                 drbd_send_sizes(mdev, 1);
1522         }
1523
1524  fail:
1525         reply->ret_code = retcode;
1526         return 0;
1527 }
1528
1529 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1530                                struct drbd_nl_cfg_reply *reply)
1531 {
1532         int retcode = NO_ERROR;
1533         int err;
1534         int ovr; /* online verify running */
1535         int rsr; /* re-sync running */
1536         struct crypto_hash *verify_tfm = NULL;
1537         struct crypto_hash *csums_tfm = NULL;
1538         struct syncer_conf sc;
1539         cpumask_var_t new_cpu_mask;
1540
1541         if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1542                 retcode = ERR_NOMEM;
1543                 goto fail;
1544         }
1545
1546         if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1547                 memset(&sc, 0, sizeof(struct syncer_conf));
1548                 sc.rate       = DRBD_RATE_DEF;
1549                 sc.after      = DRBD_AFTER_DEF;
1550                 sc.al_extents = DRBD_AL_EXTENTS_DEF;
1551         } else
1552                 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1553
1554         if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1555                 retcode = ERR_MANDATORY_TAG;
1556                 goto fail;
1557         }
1558
1559         /* re-sync running */
1560         rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1561                 mdev->state.conn == C_SYNC_TARGET ||
1562                 mdev->state.conn == C_PAUSED_SYNC_S ||
1563                 mdev->state.conn == C_PAUSED_SYNC_T );
1564
1565         if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1566                 retcode = ERR_CSUMS_RESYNC_RUNNING;
1567                 goto fail;
1568         }
1569
1570         if (!rsr && sc.csums_alg[0]) {
1571                 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1572                 if (IS_ERR(csums_tfm)) {
1573                         csums_tfm = NULL;
1574                         retcode = ERR_CSUMS_ALG;
1575                         goto fail;
1576                 }
1577
1578                 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1579                         retcode = ERR_CSUMS_ALG_ND;
1580                         goto fail;
1581                 }
1582         }
1583
1584         /* online verify running */
1585         ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1586
1587         if (ovr) {
1588                 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1589                         retcode = ERR_VERIFY_RUNNING;
1590                         goto fail;
1591                 }
1592         }
1593
1594         if (!ovr && sc.verify_alg[0]) {
1595                 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1596                 if (IS_ERR(verify_tfm)) {
1597                         verify_tfm = NULL;
1598                         retcode = ERR_VERIFY_ALG;
1599                         goto fail;
1600                 }
1601
1602                 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1603                         retcode = ERR_VERIFY_ALG_ND;
1604                         goto fail;
1605                 }
1606         }
1607
1608         /* silently ignore cpu mask on UP kernel */
1609         if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1610                 err = __bitmap_parse(sc.cpu_mask, 32, 0,
1611                                 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1612                 if (err) {
1613                         dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1614                         retcode = ERR_CPU_MASK_PARSE;
1615                         goto fail;
1616                 }
1617         }
1618
1619         ERR_IF (sc.rate < 1) sc.rate = 1;
1620         ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
1621 #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1622         if (sc.al_extents > AL_MAX) {
1623                 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1624                 sc.al_extents = AL_MAX;
1625         }
1626 #undef AL_MAX
1627
1628         /* most sanity checks done, try to assign the new sync-after
1629          * dependency.  need to hold the global lock in there,
1630          * to avoid a race in the dependency loop check. */
1631         retcode = drbd_alter_sa(mdev, sc.after);
1632         if (retcode != NO_ERROR)
1633                 goto fail;
1634
1635         /* ok, assign the rest of it as well.
1636          * lock against receive_SyncParam() */
1637         spin_lock(&mdev->peer_seq_lock);
1638         mdev->sync_conf = sc;
1639
1640         if (!rsr) {
1641                 crypto_free_hash(mdev->csums_tfm);
1642                 mdev->csums_tfm = csums_tfm;
1643                 csums_tfm = NULL;
1644         }
1645
1646         if (!ovr) {
1647                 crypto_free_hash(mdev->verify_tfm);
1648                 mdev->verify_tfm = verify_tfm;
1649                 verify_tfm = NULL;
1650         }
1651         spin_unlock(&mdev->peer_seq_lock);
1652
1653         if (get_ldev(mdev)) {
1654                 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1655                 drbd_al_shrink(mdev);
1656                 err = drbd_check_al_size(mdev);
1657                 lc_unlock(mdev->act_log);
1658                 wake_up(&mdev->al_wait);
1659
1660                 put_ldev(mdev);
1661                 drbd_md_sync(mdev);
1662
1663                 if (err) {
1664                         retcode = ERR_NOMEM;
1665                         goto fail;
1666                 }
1667         }
1668
1669         if (mdev->state.conn >= C_CONNECTED)
1670                 drbd_send_sync_param(mdev, &sc);
1671
1672         if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
1673                 cpumask_copy(mdev->cpu_mask, new_cpu_mask);
1674                 drbd_calc_cpu_mask(mdev);
1675                 mdev->receiver.reset_cpu_mask = 1;
1676                 mdev->asender.reset_cpu_mask = 1;
1677                 mdev->worker.reset_cpu_mask = 1;
1678         }
1679
1680         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1681 fail:
1682         free_cpumask_var(new_cpu_mask);
1683         crypto_free_hash(csums_tfm);
1684         crypto_free_hash(verify_tfm);
1685         reply->ret_code = retcode;
1686         return 0;
1687 }
1688
1689 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1690                               struct drbd_nl_cfg_reply *reply)
1691 {
1692         int retcode;
1693
1694         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1695
1696         if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1697                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1698
1699         while (retcode == SS_NEED_CONNECTION) {
1700                 spin_lock_irq(&mdev->req_lock);
1701                 if (mdev->state.conn < C_CONNECTED)
1702                         retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1703                 spin_unlock_irq(&mdev->req_lock);
1704
1705                 if (retcode != SS_NEED_CONNECTION)
1706                         break;
1707
1708                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1709         }
1710
1711         reply->ret_code = retcode;
1712         return 0;
1713 }
1714
1715 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1716                                    struct drbd_nl_cfg_reply *reply)
1717 {
1718
1719         reply->ret_code = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1720
1721         return 0;
1722 }
1723
1724 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1725                               struct drbd_nl_cfg_reply *reply)
1726 {
1727         int retcode = NO_ERROR;
1728
1729         if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1730                 retcode = ERR_PAUSE_IS_SET;
1731
1732         reply->ret_code = retcode;
1733         return 0;
1734 }
1735
1736 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1737                                struct drbd_nl_cfg_reply *reply)
1738 {
1739         int retcode = NO_ERROR;
1740
1741         if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO)
1742                 retcode = ERR_PAUSE_IS_CLEAR;
1743
1744         reply->ret_code = retcode;
1745         return 0;
1746 }
1747
1748 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1749                               struct drbd_nl_cfg_reply *reply)
1750 {
1751         reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1752
1753         return 0;
1754 }
1755
1756 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1757                              struct drbd_nl_cfg_reply *reply)
1758 {
1759         reply->ret_code = drbd_request_state(mdev, NS(susp, 0));
1760         return 0;
1761 }
1762
1763 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1764                            struct drbd_nl_cfg_reply *reply)
1765 {
1766         reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
1767         return 0;
1768 }
1769
1770 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1771                            struct drbd_nl_cfg_reply *reply)
1772 {
1773         unsigned short *tl;
1774
1775         tl = reply->tag_list;
1776
1777         if (get_ldev(mdev)) {
1778                 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
1779                 put_ldev(mdev);
1780         }
1781
1782         if (get_net_conf(mdev)) {
1783                 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
1784                 put_net_conf(mdev);
1785         }
1786         tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
1787
1788         put_unaligned(TT_END, tl++); /* Close the tag list */
1789
1790         return (int)((char *)tl - (char *)reply->tag_list);
1791 }
1792
1793 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1794                              struct drbd_nl_cfg_reply *reply)
1795 {
1796         unsigned short *tl = reply->tag_list;
1797         union drbd_state s = mdev->state;
1798         unsigned long rs_left;
1799         unsigned int res;
1800
1801         tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
1802
1803         /* no local ref, no bitmap, no syncer progress. */
1804         if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
1805                 if (get_ldev(mdev)) {
1806                         drbd_get_syncer_progress(mdev, &rs_left, &res);
1807                         tl = tl_add_int(tl, T_sync_progress, &res);
1808                         put_ldev(mdev);
1809                 }
1810         }
1811         put_unaligned(TT_END, tl++); /* Close the tag list */
1812
1813         return (int)((char *)tl - (char *)reply->tag_list);
1814 }
1815
1816 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1817                              struct drbd_nl_cfg_reply *reply)
1818 {
1819         unsigned short *tl;
1820
1821         tl = reply->tag_list;
1822
1823         if (get_ldev(mdev)) {
1824                 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
1825                 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
1826                 put_ldev(mdev);
1827         }
1828         put_unaligned(TT_END, tl++); /* Close the tag list */
1829
1830         return (int)((char *)tl - (char *)reply->tag_list);
1831 }
1832
1833 /**
1834  * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
1835  * @mdev:       DRBD device.
1836  * @nlp:        Netlink/connector packet from drbdsetup
1837  * @reply:      Reply packet for drbdsetup
1838  */
1839 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1840                                     struct drbd_nl_cfg_reply *reply)
1841 {
1842         unsigned short *tl;
1843         char rv;
1844
1845         tl = reply->tag_list;
1846
1847         rv = mdev->state.pdsk == D_OUTDATED        ? UT_PEER_OUTDATED :
1848           test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
1849
1850         tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
1851         put_unaligned(TT_END, tl++); /* Close the tag list */
1852
1853         return (int)((char *)tl - (char *)reply->tag_list);
1854 }
1855
1856 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1857                                     struct drbd_nl_cfg_reply *reply)
1858 {
1859         /* default to resume from last known position, if possible */
1860         struct start_ov args =
1861                 { .start_sector = mdev->ov_start_sector };
1862
1863         if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
1864                 reply->ret_code = ERR_MANDATORY_TAG;
1865                 return 0;
1866         }
1867         /* w_make_ov_request expects position to be aligned */
1868         mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
1869         reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
1870         return 0;
1871 }
1872
1873
1874 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1875                               struct drbd_nl_cfg_reply *reply)
1876 {
1877         int retcode = NO_ERROR;
1878         int skip_initial_sync = 0;
1879         int err;
1880
1881         struct new_c_uuid args;
1882
1883         memset(&args, 0, sizeof(struct new_c_uuid));
1884         if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
1885                 reply->ret_code = ERR_MANDATORY_TAG;
1886                 return 0;
1887         }
1888
1889         mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
1890
1891         if (!get_ldev(mdev)) {
1892                 retcode = ERR_NO_DISK;
1893                 goto out;
1894         }
1895
1896         /* this is "skip initial sync", assume to be clean */
1897         if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
1898             mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
1899                 dev_info(DEV, "Preparing to skip initial sync\n");
1900                 skip_initial_sync = 1;
1901         } else if (mdev->state.conn != C_STANDALONE) {
1902                 retcode = ERR_CONNECTED;
1903                 goto out_dec;
1904         }
1905
1906         drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
1907         drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
1908
1909         if (args.clear_bm) {
1910                 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
1911                 if (err) {
1912                         dev_err(DEV, "Writing bitmap failed with %d\n",err);
1913                         retcode = ERR_IO_MD_DISK;
1914                 }
1915                 if (skip_initial_sync) {
1916                         drbd_send_uuids_skip_initial_sync(mdev);
1917                         _drbd_uuid_set(mdev, UI_BITMAP, 0);
1918                         spin_lock_irq(&mdev->req_lock);
1919                         _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
1920                                         CS_VERBOSE, NULL);
1921                         spin_unlock_irq(&mdev->req_lock);
1922                 }
1923         }
1924
1925         drbd_md_sync(mdev);
1926 out_dec:
1927         put_ldev(mdev);
1928 out:
1929         mutex_unlock(&mdev->state_mutex);
1930
1931         reply->ret_code = retcode;
1932         return 0;
1933 }
1934
1935 static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp)
1936 {
1937         struct drbd_conf *mdev;
1938
1939         if (nlp->drbd_minor >= minor_count)
1940                 return NULL;
1941
1942         mdev = minor_to_mdev(nlp->drbd_minor);
1943
1944         if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) {
1945                 struct gendisk *disk = NULL;
1946                 mdev = drbd_new_device(nlp->drbd_minor);
1947
1948                 spin_lock_irq(&drbd_pp_lock);
1949                 if (minor_table[nlp->drbd_minor] == NULL) {
1950                         minor_table[nlp->drbd_minor] = mdev;
1951                         disk = mdev->vdisk;
1952                         mdev = NULL;
1953                 } /* else: we lost the race */
1954                 spin_unlock_irq(&drbd_pp_lock);
1955
1956                 if (disk) /* we won the race above */
1957                         /* in case we ever add a drbd_delete_device(),
1958                          * don't forget the del_gendisk! */
1959                         add_disk(disk);
1960                 else /* we lost the race above */
1961                         drbd_free_mdev(mdev);
1962
1963                 mdev = minor_to_mdev(nlp->drbd_minor);
1964         }
1965
1966         return mdev;
1967 }
1968
1969 struct cn_handler_struct {
1970         int (*function)(struct drbd_conf *,
1971                          struct drbd_nl_cfg_req *,
1972                          struct drbd_nl_cfg_reply *);
1973         int reply_body_size;
1974 };
1975
1976 static struct cn_handler_struct cnd_table[] = {
1977         [ P_primary ]           = { &drbd_nl_primary,           0 },
1978         [ P_secondary ]         = { &drbd_nl_secondary,         0 },
1979         [ P_disk_conf ]         = { &drbd_nl_disk_conf,         0 },
1980         [ P_detach ]            = { &drbd_nl_detach,            0 },
1981         [ P_net_conf ]          = { &drbd_nl_net_conf,          0 },
1982         [ P_disconnect ]        = { &drbd_nl_disconnect,        0 },
1983         [ P_resize ]            = { &drbd_nl_resize,            0 },
1984         [ P_syncer_conf ]       = { &drbd_nl_syncer_conf,       0 },
1985         [ P_invalidate ]        = { &drbd_nl_invalidate,        0 },
1986         [ P_invalidate_peer ]   = { &drbd_nl_invalidate_peer,   0 },
1987         [ P_pause_sync ]        = { &drbd_nl_pause_sync,        0 },
1988         [ P_resume_sync ]       = { &drbd_nl_resume_sync,       0 },
1989         [ P_suspend_io ]        = { &drbd_nl_suspend_io,        0 },
1990         [ P_resume_io ]         = { &drbd_nl_resume_io,         0 },
1991         [ P_outdate ]           = { &drbd_nl_outdate,           0 },
1992         [ P_get_config ]        = { &drbd_nl_get_config,
1993                                     sizeof(struct syncer_conf_tag_len_struct) +
1994                                     sizeof(struct disk_conf_tag_len_struct) +
1995                                     sizeof(struct net_conf_tag_len_struct) },
1996         [ P_get_state ]         = { &drbd_nl_get_state,
1997                                     sizeof(struct get_state_tag_len_struct) +
1998                                     sizeof(struct sync_progress_tag_len_struct) },
1999         [ P_get_uuids ]         = { &drbd_nl_get_uuids,
2000                                     sizeof(struct get_uuids_tag_len_struct) },
2001         [ P_get_timeout_flag ]  = { &drbd_nl_get_timeout_flag,
2002                                     sizeof(struct get_timeout_flag_tag_len_struct)},
2003         [ P_start_ov ]          = { &drbd_nl_start_ov,          0 },
2004         [ P_new_c_uuid ]        = { &drbd_nl_new_c_uuid,        0 },
2005 };
2006
2007 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
2008 {
2009         struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2010         struct cn_handler_struct *cm;
2011         struct cn_msg *cn_reply;
2012         struct drbd_nl_cfg_reply *reply;
2013         struct drbd_conf *mdev;
2014         int retcode, rr;
2015         int reply_size = sizeof(struct cn_msg)
2016                 + sizeof(struct drbd_nl_cfg_reply)
2017                 + sizeof(short int);
2018
2019         if (!try_module_get(THIS_MODULE)) {
2020                 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2021                 return;
2022         }
2023
2024         if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) {
2025                 retcode = ERR_PERM;
2026                 goto fail;
2027         }
2028
2029         mdev = ensure_mdev(nlp);
2030         if (!mdev) {
2031                 retcode = ERR_MINOR_INVALID;
2032                 goto fail;
2033         }
2034
2035         if (nlp->packet_type >= P_nl_after_last_packet) {
2036                 retcode = ERR_PACKET_NR;
2037                 goto fail;
2038         }
2039
2040         cm = cnd_table + nlp->packet_type;
2041
2042         /* This may happen if packet number is 0: */
2043         if (cm->function == NULL) {
2044                 retcode = ERR_PACKET_NR;
2045                 goto fail;
2046         }
2047
2048         reply_size += cm->reply_body_size;
2049
2050         /* allocation not in the IO path, cqueue thread context */
2051         cn_reply = kmalloc(reply_size, GFP_KERNEL);
2052         if (!cn_reply) {
2053                 retcode = ERR_NOMEM;
2054                 goto fail;
2055         }
2056         reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2057
2058         reply->packet_type =
2059                 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
2060         reply->minor = nlp->drbd_minor;
2061         reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2062         /* reply->tag_list; might be modified by cm->function. */
2063
2064         rr = cm->function(mdev, nlp, reply);
2065
2066         cn_reply->id = req->id;
2067         cn_reply->seq = req->seq;
2068         cn_reply->ack = req->ack  + 1;
2069         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2070         cn_reply->flags = 0;
2071
2072         rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2073         if (rr && rr != -ESRCH)
2074                 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2075
2076         kfree(cn_reply);
2077         module_put(THIS_MODULE);
2078         return;
2079  fail:
2080         drbd_nl_send_reply(req, retcode);
2081         module_put(THIS_MODULE);
2082 }
2083
2084 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2085
2086 static unsigned short *
2087 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2088         unsigned short len, int nul_terminated)
2089 {
2090         unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2091         len = (len < l) ? len :  l;
2092         put_unaligned(tag, tl++);
2093         put_unaligned(len, tl++);
2094         memcpy(tl, data, len);
2095         tl = (unsigned short*)((char*)tl + len);
2096         if (nul_terminated)
2097                 *((char*)tl - 1) = 0;
2098         return tl;
2099 }
2100
2101 static unsigned short *
2102 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2103 {
2104         return __tl_add_blob(tl, tag, data, len, 0);
2105 }
2106
2107 static unsigned short *
2108 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2109 {
2110         return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2111 }
2112
2113 static unsigned short *
2114 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2115 {
2116         put_unaligned(tag, tl++);
2117         switch(tag_type(tag)) {
2118         case TT_INTEGER:
2119                 put_unaligned(sizeof(int), tl++);
2120                 put_unaligned(*(int *)val, (int *)tl);
2121                 tl = (unsigned short*)((char*)tl+sizeof(int));
2122                 break;
2123         case TT_INT64:
2124                 put_unaligned(sizeof(u64), tl++);
2125                 put_unaligned(*(u64 *)val, (u64 *)tl);
2126                 tl = (unsigned short*)((char*)tl+sizeof(u64));
2127                 break;
2128         default:
2129                 /* someone did something stupid. */
2130                 ;
2131         }
2132         return tl;
2133 }
2134
2135 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2136 {
2137         char buffer[sizeof(struct cn_msg)+
2138                     sizeof(struct drbd_nl_cfg_reply)+
2139                     sizeof(struct get_state_tag_len_struct)+
2140                     sizeof(short int)];
2141         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2142         struct drbd_nl_cfg_reply *reply =
2143                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2144         unsigned short *tl = reply->tag_list;
2145
2146         /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2147
2148         tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2149
2150         put_unaligned(TT_END, tl++); /* Close the tag list */
2151
2152         cn_reply->id.idx = CN_IDX_DRBD;
2153         cn_reply->id.val = CN_VAL_DRBD;
2154
2155         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2156         cn_reply->ack = 0; /* not used here. */
2157         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2158                 (int)((char *)tl - (char *)reply->tag_list);
2159         cn_reply->flags = 0;
2160
2161         reply->packet_type = P_get_state;
2162         reply->minor = mdev_to_minor(mdev);
2163         reply->ret_code = NO_ERROR;
2164
2165         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2166 }
2167
2168 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2169 {
2170         char buffer[sizeof(struct cn_msg)+
2171                     sizeof(struct drbd_nl_cfg_reply)+
2172                     sizeof(struct call_helper_tag_len_struct)+
2173                     sizeof(short int)];
2174         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2175         struct drbd_nl_cfg_reply *reply =
2176                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2177         unsigned short *tl = reply->tag_list;
2178
2179         /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2180
2181         tl = tl_add_str(tl, T_helper, helper_name);
2182         put_unaligned(TT_END, tl++); /* Close the tag list */
2183
2184         cn_reply->id.idx = CN_IDX_DRBD;
2185         cn_reply->id.val = CN_VAL_DRBD;
2186
2187         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2188         cn_reply->ack = 0; /* not used here. */
2189         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2190                 (int)((char *)tl - (char *)reply->tag_list);
2191         cn_reply->flags = 0;
2192
2193         reply->packet_type = P_call_helper;
2194         reply->minor = mdev_to_minor(mdev);
2195         reply->ret_code = NO_ERROR;
2196
2197         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2198 }
2199
2200 void drbd_bcast_ee(struct drbd_conf *mdev,
2201                 const char *reason, const int dgs,
2202                 const char* seen_hash, const char* calc_hash,
2203                 const struct drbd_epoch_entry* e)
2204 {
2205         struct cn_msg *cn_reply;
2206         struct drbd_nl_cfg_reply *reply;
2207         struct bio_vec *bvec;
2208         unsigned short *tl;
2209         int i;
2210
2211         if (!e)
2212                 return;
2213         if (!reason || !reason[0])
2214                 return;
2215
2216         /* apparently we have to memcpy twice, first to prepare the data for the
2217          * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2218          * netlink skb. */
2219         /* receiver thread context, which is not in the writeout path (of this node),
2220          * but may be in the writeout path of the _other_ node.
2221          * GFP_NOIO to avoid potential "distributed deadlock". */
2222         cn_reply = kmalloc(
2223                 sizeof(struct cn_msg)+
2224                 sizeof(struct drbd_nl_cfg_reply)+
2225                 sizeof(struct dump_ee_tag_len_struct)+
2226                 sizeof(short int),
2227                 GFP_NOIO);
2228
2229         if (!cn_reply) {
2230                 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2231                                 (unsigned long long)e->sector, e->size);
2232                 return;
2233         }
2234
2235         reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2236         tl = reply->tag_list;
2237
2238         tl = tl_add_str(tl, T_dump_ee_reason, reason);
2239         tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2240         tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2241         tl = tl_add_int(tl, T_ee_sector, &e->sector);
2242         tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2243
2244         put_unaligned(T_ee_data, tl++);
2245         put_unaligned(e->size, tl++);
2246
2247         __bio_for_each_segment(bvec, e->private_bio, i, 0) {
2248                 void *d = kmap(bvec->bv_page);
2249                 memcpy(tl, d + bvec->bv_offset, bvec->bv_len);
2250                 kunmap(bvec->bv_page);
2251                 tl=(unsigned short*)((char*)tl + bvec->bv_len);
2252         }
2253         put_unaligned(TT_END, tl++); /* Close the tag list */
2254
2255         cn_reply->id.idx = CN_IDX_DRBD;
2256         cn_reply->id.val = CN_VAL_DRBD;
2257
2258         cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2259         cn_reply->ack = 0; // not used here.
2260         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2261                 (int)((char*)tl - (char*)reply->tag_list);
2262         cn_reply->flags = 0;
2263
2264         reply->packet_type = P_dump_ee;
2265         reply->minor = mdev_to_minor(mdev);
2266         reply->ret_code = NO_ERROR;
2267
2268         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2269         kfree(cn_reply);
2270 }
2271
2272 void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2273 {
2274         char buffer[sizeof(struct cn_msg)+
2275                     sizeof(struct drbd_nl_cfg_reply)+
2276                     sizeof(struct sync_progress_tag_len_struct)+
2277                     sizeof(short int)];
2278         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2279         struct drbd_nl_cfg_reply *reply =
2280                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2281         unsigned short *tl = reply->tag_list;
2282         unsigned long rs_left;
2283         unsigned int res;
2284
2285         /* no local ref, no bitmap, no syncer progress, no broadcast. */
2286         if (!get_ldev(mdev))
2287                 return;
2288         drbd_get_syncer_progress(mdev, &rs_left, &res);
2289         put_ldev(mdev);
2290
2291         tl = tl_add_int(tl, T_sync_progress, &res);
2292         put_unaligned(TT_END, tl++); /* Close the tag list */
2293
2294         cn_reply->id.idx = CN_IDX_DRBD;
2295         cn_reply->id.val = CN_VAL_DRBD;
2296
2297         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2298         cn_reply->ack = 0; /* not used here. */
2299         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2300                 (int)((char *)tl - (char *)reply->tag_list);
2301         cn_reply->flags = 0;
2302
2303         reply->packet_type = P_sync_progress;
2304         reply->minor = mdev_to_minor(mdev);
2305         reply->ret_code = NO_ERROR;
2306
2307         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2308 }
2309
2310 int __init drbd_nl_init(void)
2311 {
2312         static struct cb_id cn_id_drbd;
2313         int err, try=10;
2314
2315         cn_id_drbd.val = CN_VAL_DRBD;
2316         do {
2317                 cn_id_drbd.idx = cn_idx;
2318                 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2319                 if (!err)
2320                         break;
2321                 cn_idx = (cn_idx + CN_IDX_STEP);
2322         } while (try--);
2323
2324         if (err) {
2325                 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2326                 return err;
2327         }
2328
2329         return 0;
2330 }
2331
2332 void drbd_nl_cleanup(void)
2333 {
2334         static struct cb_id cn_id_drbd;
2335
2336         cn_id_drbd.idx = cn_idx;
2337         cn_id_drbd.val = CN_VAL_DRBD;
2338
2339         cn_del_callback(&cn_id_drbd);
2340 }
2341
2342 void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2343 {
2344         char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2345         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2346         struct drbd_nl_cfg_reply *reply =
2347                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2348         int rr;
2349
2350         cn_reply->id = req->id;
2351
2352         cn_reply->seq = req->seq;
2353         cn_reply->ack = req->ack  + 1;
2354         cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2355         cn_reply->flags = 0;
2356
2357         reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2358         reply->ret_code = ret_code;
2359
2360         rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2361         if (rr && rr != -ESRCH)
2362                 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2363 }
2364