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_UP_TO_DATE &&
 289                      mdev->state.disk >= D_INCONSISTENT)) {
 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.primary_force);
 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, enum dds_flags flags) __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, flags & DDSF_FORCED);
 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, !(flags & DDSF_NO_RESYNC));
 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, int assume_peer_has_space)
 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 (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
 610                 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
 611                 p_size = m_size;
 612         }
 613
 614         if (p_size && m_size) {
 615                 size = min_t(sector_t, p_size, m_size);
 616         } else {
 617                 if (la_size) {
 618                         size = la_size;
 619                         if (m_size && m_size < size)
 620                                 size = m_size;
 621                         if (p_size && p_size < size)
 622                                 size = p_size;
 623                 } else {
 624                         if (m_size)
 625                                 size = m_size;
 626                         if (p_size)
 627                                 size = p_size;
 628                 }
 629         }
 630
 631         if (size == 0)
 632                 dev_err(DEV, "Both nodes diskless!\n");
 633
 634         if (u_size) {
 635                 if (u_size > size)
 636                         dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
 637                             (unsigned long)u_size>>1, (unsigned long)size>>1);
 638                 else
 639                         size = u_size;
 640         }
 641
 642         return size;
 643 }
 644
 645 /**
 646  * drbd_check_al_size() - Ensures that the AL is of the right size
 647  * @mdev:       DRBD device.
 648  *
 649  * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
 650  * failed, and 0 on success. You should call drbd_md_sync() after you called
 651  * this function.
 652  */
 653 static int drbd_check_al_size(struct drbd_conf *mdev)
 654 {
 655         struct lru_cache *n, *t;
 656         struct lc_element *e;
 657         unsigned int in_use;
 658         int i;
 659
 660         ERR_IF(mdev->sync_conf.al_extents < 7)
 661                 mdev->sync_conf.al_extents = 127;
 662
 663         if (mdev->act_log &&
 664             mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
 665                 return 0;
 666
 667         in_use = 0;
 668         t = mdev->act_log;
 669         n = lc_create("act_log", drbd_al_ext_cache,
 670                 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
 671
 672         if (n == NULL) {
 673                 dev_err(DEV, "Cannot allocate act_log lru!\n");
 674                 return -ENOMEM;
 675         }
 676         spin_lock_irq(&mdev->al_lock);
 677         if (t) {
 678                 for (i = 0; i < t->nr_elements; i++) {
 679                         e = lc_element_by_index(t, i);
 680                         if (e->refcnt)
 681                                 dev_err(DEV, "refcnt(%d)==%d\n",
 682                                     e->lc_number, e->refcnt);
 683                         in_use += e->refcnt;
 684                 }
 685         }
 686         if (!in_use)
 687                 mdev->act_log = n;
 688         spin_unlock_irq(&mdev->al_lock);
 689         if (in_use) {
 690                 dev_err(DEV, "Activity log still in use!\n");
 691                 lc_destroy(n);
 692                 return -EBUSY;
 693         } else {
 694                 if (t)
 695                         lc_destroy(t);
 696         }
 697         drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
 698         return 0;
 699 }
 700
 701 void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local)
 702 {
 703         struct request_queue * const q = mdev->rq_queue;
 704         struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
 705         int max_segments = mdev->ldev->dc.max_bio_bvecs;
 706
 707         max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
 708
 709         blk_queue_max_hw_sectors(q, max_seg_s >> 9);
 710         blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
 711         blk_queue_max_segment_size(q, max_seg_s);
 712         blk_queue_logical_block_size(q, 512);
 713         blk_queue_segment_boundary(q, PAGE_SIZE-1);
 714         blk_stack_limits(&q->limits, &b->limits, 0);
 715
 716         if (b->merge_bvec_fn)
 717                 dev_warn(DEV, "Backing device's merge_bvec_fn() = %p\n",
 718                      b->merge_bvec_fn);
 719         dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q));
 720
 721         if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
 722                 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
 723                      q->backing_dev_info.ra_pages,
 724                      b->backing_dev_info.ra_pages);
 725                 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
 726         }
 727 }
 728
 729 /* serialize deconfig (worker exiting, doing cleanup)
 730  * and reconfig (drbdsetup disk, drbdsetup net)
 731  *
 732  * wait for a potentially exiting worker, then restart it,
 733  * or start a new one.
 734  */
 735 static void drbd_reconfig_start(struct drbd_conf *mdev)
 736 {
 737         wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
 738         wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
 739         drbd_thread_start(&mdev->worker);
 740 }
 741
 742 /* if still unconfigured, stops worker again.
 743  * if configured now, clears CONFIG_PENDING.
 744  * wakes potential waiters */
 745 static void drbd_reconfig_done(struct drbd_conf *mdev)
 746 {
 747         spin_lock_irq(&mdev->req_lock);
 748         if (mdev->state.disk == D_DISKLESS &&
 749             mdev->state.conn == C_STANDALONE &&
 750             mdev->state.role == R_SECONDARY) {
 751                 set_bit(DEVICE_DYING, &mdev->flags);
 752                 drbd_thread_stop_nowait(&mdev->worker);
 753         } else
 754                 clear_bit(CONFIG_PENDING, &mdev->flags);
 755         spin_unlock_irq(&mdev->req_lock);
 756         wake_up(&mdev->state_wait);
 757 }
 758
 759 /* does always return 0;
 760  * interesting return code is in reply->ret_code */
 761 static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
 762                              struct drbd_nl_cfg_reply *reply)
 763 {
 764         enum drbd_ret_codes retcode;
 765         enum determine_dev_size dd;
 766         sector_t max_possible_sectors;
 767         sector_t min_md_device_sectors;
 768         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
 769         struct inode *inode, *inode2;
 770         struct lru_cache *resync_lru = NULL;
 771         union drbd_state ns, os;
 772         int rv;
 773         int cp_discovered = 0;
 774         int logical_block_size;
 775
 776         drbd_reconfig_start(mdev);
 777
 778         /* if you want to reconfigure, please tear down first */
 779         if (mdev->state.disk > D_DISKLESS) {
 780                 retcode = ERR_DISK_CONFIGURED;
 781                 goto fail;
 782         }
 783
 784         /* allocation not in the IO path, cqueue thread context */
 785         nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
 786         if (!nbc) {
 787                 retcode = ERR_NOMEM;
 788                 goto fail;
 789         }
 790
 791         nbc->dc.disk_size     = DRBD_DISK_SIZE_SECT_DEF;
 792         nbc->dc.on_io_error   = DRBD_ON_IO_ERROR_DEF;
 793         nbc->dc.fencing       = DRBD_FENCING_DEF;
 794         nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
 795
 796         if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
 797                 retcode = ERR_MANDATORY_TAG;
 798                 goto fail;
 799         }
 800
 801         if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
 802                 retcode = ERR_MD_IDX_INVALID;
 803                 goto fail;
 804         }
 805
 806         nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0);
 807         if (IS_ERR(nbc->lo_file)) {
 808                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
 809                     PTR_ERR(nbc->lo_file));
 810                 nbc->lo_file = NULL;
 811                 retcode = ERR_OPEN_DISK;
 812                 goto fail;
 813         }
 814
 815         inode = nbc->lo_file->f_dentry->d_inode;
 816
 817         if (!S_ISBLK(inode->i_mode)) {
 818                 retcode = ERR_DISK_NOT_BDEV;
 819                 goto fail;
 820         }
 821
 822         nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0);
 823         if (IS_ERR(nbc->md_file)) {
 824                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
 825                     PTR_ERR(nbc->md_file));
 826                 nbc->md_file = NULL;
 827                 retcode = ERR_OPEN_MD_DISK;
 828                 goto fail;
 829         }
 830
 831         inode2 = nbc->md_file->f_dentry->d_inode;
 832
 833         if (!S_ISBLK(inode2->i_mode)) {
 834                 retcode = ERR_MD_NOT_BDEV;
 835                 goto fail;
 836         }
 837
 838         nbc->backing_bdev = inode->i_bdev;
 839         if (bd_claim(nbc->backing_bdev, mdev)) {
 840                 printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n",
 841                        nbc->backing_bdev, mdev,
 842                        nbc->backing_bdev->bd_holder,
 843                        nbc->backing_bdev->bd_contains->bd_holder,
 844                        nbc->backing_bdev->bd_holders);
 845                 retcode = ERR_BDCLAIM_DISK;
 846                 goto fail;
 847         }
 848
 849         resync_lru = lc_create("resync", drbd_bm_ext_cache,
 850                         61, sizeof(struct bm_extent),
 851                         offsetof(struct bm_extent, lce));
 852         if (!resync_lru) {
 853                 retcode = ERR_NOMEM;
 854                 goto release_bdev_fail;
 855         }
 856
 857         /* meta_dev_idx >= 0: external fixed size,
 858          * possibly multiple drbd sharing one meta device.
 859          * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is
 860          * not yet used by some other drbd minor!
 861          * (if you use drbd.conf + drbdadm,
 862          * that should check it for you already; but if you don't, or someone
 863          * fooled it, we need to double check here) */
 864         nbc->md_bdev = inode2->i_bdev;
 865         if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev
 866                                 : (void *) drbd_m_holder)) {
 867                 retcode = ERR_BDCLAIM_MD_DISK;
 868                 goto release_bdev_fail;
 869         }
 870
 871         if ((nbc->backing_bdev == nbc->md_bdev) !=
 872             (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
 873              nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
 874                 retcode = ERR_MD_IDX_INVALID;
 875                 goto release_bdev2_fail;
 876         }
 877
 878         /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
 879         drbd_md_set_sector_offsets(mdev, nbc);
 880
 881         if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
 882                 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
 883                         (unsigned long long) drbd_get_max_capacity(nbc),
 884                         (unsigned long long) nbc->dc.disk_size);
 885                 retcode = ERR_DISK_TO_SMALL;
 886                 goto release_bdev2_fail;
 887         }
 888
 889         if (nbc->dc.meta_dev_idx < 0) {
 890                 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
 891                 /* at least one MB, otherwise it does not make sense */
 892                 min_md_device_sectors = (2<<10);
 893         } else {
 894                 max_possible_sectors = DRBD_MAX_SECTORS;
 895                 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
 896         }
 897
 898         if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
 899                 retcode = ERR_MD_DISK_TO_SMALL;
 900                 dev_warn(DEV, "refusing attach: md-device too small, "
 901                      "at least %llu sectors needed for this meta-disk type\n",
 902                      (unsigned long long) min_md_device_sectors);
 903                 goto release_bdev2_fail;
 904         }
 905
 906         /* Make sure the new disk is big enough
 907          * (we may currently be R_PRIMARY with no local disk...) */
 908         if (drbd_get_max_capacity(nbc) <
 909             drbd_get_capacity(mdev->this_bdev)) {
 910                 retcode = ERR_DISK_TO_SMALL;
 911                 goto release_bdev2_fail;
 912         }
 913
 914         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
 915
 916         if (nbc->known_size > max_possible_sectors) {
 917                 dev_warn(DEV, "==> truncating very big lower level device "
 918                         "to currently maximum possible %llu sectors <==\n",
 919                         (unsigned long long) max_possible_sectors);
 920                 if (nbc->dc.meta_dev_idx >= 0)
 921                         dev_warn(DEV, "==>> using internal or flexible "
 922                                       "meta data may help <<==\n");
 923         }
 924
 925         drbd_suspend_io(mdev);
 926         /* also wait for the last barrier ack. */
 927         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt));
 928         /* and for any other previously queued work */
 929         drbd_flush_workqueue(mdev);
 930
 931         retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
 932         drbd_resume_io(mdev);
 933         if (retcode < SS_SUCCESS)
 934                 goto release_bdev2_fail;
 935
 936         if (!get_ldev_if_state(mdev, D_ATTACHING))
 937                 goto force_diskless;
 938
 939         drbd_md_set_sector_offsets(mdev, nbc);
 940
 941         /* allocate a second IO page if logical_block_size != 512 */
 942         logical_block_size = bdev_logical_block_size(nbc->md_bdev);
 943         if (logical_block_size == 0)
 944                 logical_block_size = MD_SECTOR_SIZE;
 945
 946         if (logical_block_size != MD_SECTOR_SIZE) {
 947                 if (!mdev->md_io_tmpp) {
 948                         struct page *page = alloc_page(GFP_NOIO);
 949                         if (!page)
 950                                 goto force_diskless_dec;
 951
 952                         dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
 953                              logical_block_size, MD_SECTOR_SIZE);
 954                         dev_warn(DEV, "Workaround engaged (has performance impact).\n");
 955
 956                         mdev->md_io_tmpp = page;
 957                 }
 958         }
 959
 960         if (!mdev->bitmap) {
 961                 if (drbd_bm_init(mdev)) {
 962                         retcode = ERR_NOMEM;
 963                         goto force_diskless_dec;
 964                 }
 965         }
 966
 967         retcode = drbd_md_read(mdev, nbc);
 968         if (retcode != NO_ERROR)
 969                 goto force_diskless_dec;
 970
 971         if (mdev->state.conn < C_CONNECTED &&
 972             mdev->state.role == R_PRIMARY &&
 973             (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
 974                 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
 975                     (unsigned long long)mdev->ed_uuid);
 976                 retcode = ERR_DATA_NOT_CURRENT;
 977                 goto force_diskless_dec;
 978         }
 979
 980         /* Since we are diskless, fix the activity log first... */
 981         if (drbd_check_al_size(mdev)) {
 982                 retcode = ERR_NOMEM;
 983                 goto force_diskless_dec;
 984         }
 985
 986         /* Prevent shrinking of consistent devices ! */
 987         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
 988             drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
 989                 dev_warn(DEV, "refusing to truncate a consistent device\n");
 990                 retcode = ERR_DISK_TO_SMALL;
 991                 goto force_diskless_dec;
 992         }
 993
 994         if (!drbd_al_read_log(mdev, nbc)) {
 995                 retcode = ERR_IO_MD_DISK;
 996                 goto force_diskless_dec;
 997         }
 998
 999         /* Reset the "barriers don't work" bits here, then force meta data to
1000          * be written, to ensure we determine if barriers are supported. */
1001         if (nbc->dc.no_md_flush)
1002                 set_bit(MD_NO_BARRIER, &mdev->flags);
1003         else
1004                 clear_bit(MD_NO_BARRIER, &mdev->flags);
1005
1006         /* Point of no return reached.
1007          * Devices and memory are no longer released by error cleanup below.
1008          * now mdev takes over responsibility, and the state engine should
1009          * clean it up somewhere.  */
1010         D_ASSERT(mdev->ldev == NULL);
1011         mdev->ldev = nbc;
1012         mdev->resync = resync_lru;
1013         nbc = NULL;
1014         resync_lru = NULL;
1015
1016         mdev->write_ordering = WO_bio_barrier;
1017         drbd_bump_write_ordering(mdev, WO_bio_barrier);
1018
1019         if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1020                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1021         else
1022                 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1023
1024         if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND)) {
1025                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1026                 cp_discovered = 1;
1027         }
1028
1029         mdev->send_cnt = 0;
1030         mdev->recv_cnt = 0;
1031         mdev->read_cnt = 0;
1032         mdev->writ_cnt = 0;
1033
1034         drbd_setup_queue_param(mdev, DRBD_MAX_SEGMENT_SIZE);
1035
1036         /* If I am currently not R_PRIMARY,
1037          * but meta data primary indicator is set,
1038          * I just now recover from a hard crash,
1039          * and have been R_PRIMARY before that crash.
1040          *
1041          * Now, if I had no connection before that crash
1042          * (have been degraded R_PRIMARY), chances are that
1043          * I won't find my peer now either.
1044          *
1045          * In that case, and _only_ in that case,
1046          * we use the degr-wfc-timeout instead of the default,
1047          * so we can automatically recover from a crash of a
1048          * degraded but active "cluster" after a certain timeout.
1049          */
1050         clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1051         if (mdev->state.role != R_PRIMARY &&
1052              drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1053             !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1054                 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1055
1056         dd = drbd_determin_dev_size(mdev, 0);
1057         if (dd == dev_size_error) {
1058                 retcode = ERR_NOMEM_BITMAP;
1059                 goto force_diskless_dec;
1060         } else if (dd == grew)
1061                 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1062
1063         if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1064                 dev_info(DEV, "Assuming that all blocks are out of sync "
1065                      "(aka FullSync)\n");
1066                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) {
1067                         retcode = ERR_IO_MD_DISK;
1068                         goto force_diskless_dec;
1069                 }
1070         } else {
1071                 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
1072                         retcode = ERR_IO_MD_DISK;
1073                         goto force_diskless_dec;
1074                 }
1075         }
1076
1077         if (cp_discovered) {
1078                 drbd_al_apply_to_bm(mdev);
1079                 drbd_al_to_on_disk_bm(mdev);
1080         }
1081
1082         spin_lock_irq(&mdev->req_lock);
1083         os = mdev->state;
1084         ns.i = os.i;
1085         /* If MDF_CONSISTENT is not set go into inconsistent state,
1086            otherwise investigate MDF_WasUpToDate...
1087            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1088            otherwise into D_CONSISTENT state.
1089         */
1090         if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1091                 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1092                         ns.disk = D_CONSISTENT;
1093                 else
1094                         ns.disk = D_OUTDATED;
1095         } else {
1096                 ns.disk = D_INCONSISTENT;
1097         }
1098
1099         if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1100                 ns.pdsk = D_OUTDATED;
1101
1102         if ( ns.disk == D_CONSISTENT &&
1103             (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1104                 ns.disk = D_UP_TO_DATE;
1105
1106         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1107            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1108            this point, because drbd_request_state() modifies these
1109            flags. */
1110
1111         /* In case we are C_CONNECTED postpone any decision on the new disk
1112            state after the negotiation phase. */
1113         if (mdev->state.conn == C_CONNECTED) {
1114                 mdev->new_state_tmp.i = ns.i;
1115                 ns.i = os.i;
1116                 ns.disk = D_NEGOTIATING;
1117
1118                 /* We expect to receive up-to-date UUIDs soon.
1119                    To avoid a race in receive_state, free p_uuid while
1120                    holding req_lock. I.e. atomic with the state change */
1121                 kfree(mdev->p_uuid);
1122                 mdev->p_uuid = NULL;
1123         }
1124
1125         rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1126         ns = mdev->state;
1127         spin_unlock_irq(&mdev->req_lock);
1128
1129         if (rv < SS_SUCCESS)
1130                 goto force_diskless_dec;
1131
1132         if (mdev->state.role == R_PRIMARY)
1133                 mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1134         else
1135                 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1136
1137         drbd_md_mark_dirty(mdev);
1138         drbd_md_sync(mdev);
1139
1140         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1141         put_ldev(mdev);
1142         reply->ret_code = retcode;
1143         drbd_reconfig_done(mdev);
1144         return 0;
1145
1146  force_diskless_dec:
1147         put_ldev(mdev);
1148  force_diskless:
1149         drbd_force_state(mdev, NS(disk, D_DISKLESS));
1150         drbd_md_sync(mdev);
1151  release_bdev2_fail:
1152         if (nbc)
1153                 bd_release(nbc->md_bdev);
1154  release_bdev_fail:
1155         if (nbc)
1156                 bd_release(nbc->backing_bdev);
1157  fail:
1158         if (nbc) {
1159                 if (nbc->lo_file)
1160                         fput(nbc->lo_file);
1161                 if (nbc->md_file)
1162                         fput(nbc->md_file);
1163                 kfree(nbc);
1164         }
1165         lc_destroy(resync_lru);
1166
1167         reply->ret_code = retcode;
1168         drbd_reconfig_done(mdev);
1169         return 0;
1170 }
1171
1172 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1173                           struct drbd_nl_cfg_reply *reply)
1174 {
1175         reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
1176         return 0;
1177 }
1178
1179 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1180                             struct drbd_nl_cfg_reply *reply)
1181 {
1182         int i, ns;
1183         enum drbd_ret_codes retcode;
1184         struct net_conf *new_conf = NULL;
1185         struct crypto_hash *tfm = NULL;
1186         struct crypto_hash *integrity_w_tfm = NULL;
1187         struct crypto_hash *integrity_r_tfm = NULL;
1188         struct hlist_head *new_tl_hash = NULL;
1189         struct hlist_head *new_ee_hash = NULL;
1190         struct drbd_conf *odev;
1191         char hmac_name[CRYPTO_MAX_ALG_NAME];
1192         void *int_dig_out = NULL;
1193         void *int_dig_in = NULL;
1194         void *int_dig_vv = NULL;
1195         struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1196
1197         drbd_reconfig_start(mdev);
1198
1199         if (mdev->state.conn > C_STANDALONE) {
1200                 retcode = ERR_NET_CONFIGURED;
1201                 goto fail;
1202         }
1203
1204         /* allocation not in the IO path, cqueue thread context */
1205         new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1206         if (!new_conf) {
1207                 retcode = ERR_NOMEM;
1208                 goto fail;
1209         }
1210
1211         new_conf->timeout          = DRBD_TIMEOUT_DEF;
1212         new_conf->try_connect_int  = DRBD_CONNECT_INT_DEF;
1213         new_conf->ping_int         = DRBD_PING_INT_DEF;
1214         new_conf->max_epoch_size   = DRBD_MAX_EPOCH_SIZE_DEF;
1215         new_conf->max_buffers      = DRBD_MAX_BUFFERS_DEF;
1216         new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1217         new_conf->sndbuf_size      = DRBD_SNDBUF_SIZE_DEF;
1218         new_conf->rcvbuf_size      = DRBD_RCVBUF_SIZE_DEF;
1219         new_conf->ko_count         = DRBD_KO_COUNT_DEF;
1220         new_conf->after_sb_0p      = DRBD_AFTER_SB_0P_DEF;
1221         new_conf->after_sb_1p      = DRBD_AFTER_SB_1P_DEF;
1222         new_conf->after_sb_2p      = DRBD_AFTER_SB_2P_DEF;
1223         new_conf->want_lose        = 0;
1224         new_conf->two_primaries    = 0;
1225         new_conf->wire_protocol    = DRBD_PROT_C;
1226         new_conf->ping_timeo       = DRBD_PING_TIMEO_DEF;
1227         new_conf->rr_conflict      = DRBD_RR_CONFLICT_DEF;
1228
1229         if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1230                 retcode = ERR_MANDATORY_TAG;
1231                 goto fail;
1232         }
1233
1234         if (new_conf->two_primaries
1235             && (new_conf->wire_protocol != DRBD_PROT_C)) {
1236                 retcode = ERR_NOT_PROTO_C;
1237                 goto fail;
1238         };
1239
1240         if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1241                 retcode = ERR_DISCARD;
1242                 goto fail;
1243         }
1244
1245         retcode = NO_ERROR;
1246
1247         new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1248         new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1249         for (i = 0; i < minor_count; i++) {
1250                 odev = minor_to_mdev(i);
1251                 if (!odev || odev == mdev)
1252                         continue;
1253                 if (get_net_conf(odev)) {
1254                         taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1255                         if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1256                             !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1257                                 retcode = ERR_LOCAL_ADDR;
1258
1259                         taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1260                         if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1261                             !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1262                                 retcode = ERR_PEER_ADDR;
1263
1264                         put_net_conf(odev);
1265                         if (retcode != NO_ERROR)
1266                                 goto fail;
1267                 }
1268         }
1269
1270         if (new_conf->cram_hmac_alg[0] != 0) {
1271                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1272                         new_conf->cram_hmac_alg);
1273                 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1274                 if (IS_ERR(tfm)) {
1275                         tfm = NULL;
1276                         retcode = ERR_AUTH_ALG;
1277                         goto fail;
1278                 }
1279
1280                 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
1281                         retcode = ERR_AUTH_ALG_ND;
1282                         goto fail;
1283                 }
1284         }
1285
1286         if (new_conf->integrity_alg[0]) {
1287                 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1288                 if (IS_ERR(integrity_w_tfm)) {
1289                         integrity_w_tfm = NULL;
1290                         retcode=ERR_INTEGRITY_ALG;
1291                         goto fail;
1292                 }
1293
1294                 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1295                         retcode=ERR_INTEGRITY_ALG_ND;
1296                         goto fail;
1297                 }
1298
1299                 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1300                 if (IS_ERR(integrity_r_tfm)) {
1301                         integrity_r_tfm = NULL;
1302                         retcode=ERR_INTEGRITY_ALG;
1303                         goto fail;
1304                 }
1305         }
1306
1307         ns = new_conf->max_epoch_size/8;
1308         if (mdev->tl_hash_s != ns) {
1309                 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1310                 if (!new_tl_hash) {
1311                         retcode = ERR_NOMEM;
1312                         goto fail;
1313                 }
1314         }
1315
1316         ns = new_conf->max_buffers/8;
1317         if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1318                 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1319                 if (!new_ee_hash) {
1320                         retcode = ERR_NOMEM;
1321                         goto fail;
1322                 }
1323         }
1324
1325         ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1326
1327         if (integrity_w_tfm) {
1328                 i = crypto_hash_digestsize(integrity_w_tfm);
1329                 int_dig_out = kmalloc(i, GFP_KERNEL);
1330                 if (!int_dig_out) {
1331                         retcode = ERR_NOMEM;
1332                         goto fail;
1333                 }
1334                 int_dig_in = kmalloc(i, GFP_KERNEL);
1335                 if (!int_dig_in) {
1336                         retcode = ERR_NOMEM;
1337                         goto fail;
1338                 }
1339                 int_dig_vv = kmalloc(i, GFP_KERNEL);
1340                 if (!int_dig_vv) {
1341                         retcode = ERR_NOMEM;
1342                         goto fail;
1343                 }
1344         }
1345
1346         if (!mdev->bitmap) {
1347                 if(drbd_bm_init(mdev)) {
1348                         retcode = ERR_NOMEM;
1349                         goto fail;
1350                 }
1351         }
1352
1353         spin_lock_irq(&mdev->req_lock);
1354         if (mdev->net_conf != NULL) {
1355                 retcode = ERR_NET_CONFIGURED;
1356                 spin_unlock_irq(&mdev->req_lock);
1357                 goto fail;
1358         }
1359         mdev->net_conf = new_conf;
1360
1361         mdev->send_cnt = 0;
1362         mdev->recv_cnt = 0;
1363
1364         if (new_tl_hash) {
1365                 kfree(mdev->tl_hash);
1366                 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1367                 mdev->tl_hash = new_tl_hash;
1368         }
1369
1370         if (new_ee_hash) {
1371                 kfree(mdev->ee_hash);
1372                 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1373                 mdev->ee_hash = new_ee_hash;
1374         }
1375
1376         crypto_free_hash(mdev->cram_hmac_tfm);
1377         mdev->cram_hmac_tfm = tfm;
1378
1379         crypto_free_hash(mdev->integrity_w_tfm);
1380         mdev->integrity_w_tfm = integrity_w_tfm;
1381
1382         crypto_free_hash(mdev->integrity_r_tfm);
1383         mdev->integrity_r_tfm = integrity_r_tfm;
1384
1385         kfree(mdev->int_dig_out);
1386         kfree(mdev->int_dig_in);
1387         kfree(mdev->int_dig_vv);
1388         mdev->int_dig_out=int_dig_out;
1389         mdev->int_dig_in=int_dig_in;
1390         mdev->int_dig_vv=int_dig_vv;
1391         spin_unlock_irq(&mdev->req_lock);
1392
1393         retcode = _drbd_request_state(mdev, NS(conn, C_UNCONNECTED), CS_VERBOSE);
1394
1395         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1396         reply->ret_code = retcode;
1397         drbd_reconfig_done(mdev);
1398         return 0;
1399
1400 fail:
1401         kfree(int_dig_out);
1402         kfree(int_dig_in);
1403         kfree(int_dig_vv);
1404         crypto_free_hash(tfm);
1405         crypto_free_hash(integrity_w_tfm);
1406         crypto_free_hash(integrity_r_tfm);
1407         kfree(new_tl_hash);
1408         kfree(new_ee_hash);
1409         kfree(new_conf);
1410
1411         reply->ret_code = retcode;
1412         drbd_reconfig_done(mdev);
1413         return 0;
1414 }
1415
1416 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1417                               struct drbd_nl_cfg_reply *reply)
1418 {
1419         int retcode;
1420
1421         retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1422
1423         if (retcode == SS_NOTHING_TO_DO)
1424                 goto done;
1425         else if (retcode == SS_ALREADY_STANDALONE)
1426                 goto done;
1427         else if (retcode == SS_PRIMARY_NOP) {
1428                 /* Our statche checking code wants to see the peer outdated. */
1429                 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1430                                                       pdsk, D_OUTDATED));
1431         } else if (retcode == SS_CW_FAILED_BY_PEER) {
1432                 /* The peer probably wants to see us outdated. */
1433                 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1434                                                         disk, D_OUTDATED),
1435                                               CS_ORDERED);
1436                 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1437                         drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1438                         retcode = SS_SUCCESS;
1439                 }
1440         }
1441
1442         if (retcode < SS_SUCCESS)
1443                 goto fail;
1444
1445         if (wait_event_interruptible(mdev->state_wait,
1446                                      mdev->state.conn != C_DISCONNECTING)) {
1447                 /* Do not test for mdev->state.conn == C_STANDALONE, since
1448                    someone else might connect us in the mean time! */
1449                 retcode = ERR_INTR;
1450                 goto fail;
1451         }
1452
1453  done:
1454         retcode = NO_ERROR;
1455  fail:
1456         drbd_md_sync(mdev);
1457         reply->ret_code = retcode;
1458         return 0;
1459 }
1460
1461 void resync_after_online_grow(struct drbd_conf *mdev)
1462 {
1463         int iass; /* I am sync source */
1464
1465         dev_info(DEV, "Resync of new storage after online grow\n");
1466         if (mdev->state.role != mdev->state.peer)
1467                 iass = (mdev->state.role == R_PRIMARY);
1468         else
1469                 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1470
1471         if (iass)
1472                 drbd_start_resync(mdev, C_SYNC_SOURCE);
1473         else
1474                 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1475 }
1476
1477 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1478                           struct drbd_nl_cfg_reply *reply)
1479 {
1480         struct resize rs;
1481         int retcode = NO_ERROR;
1482         enum determine_dev_size dd;
1483         enum dds_flags ddsf;
1484
1485         memset(&rs, 0, sizeof(struct resize));
1486         if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1487                 retcode = ERR_MANDATORY_TAG;
1488                 goto fail;
1489         }
1490
1491         if (mdev->state.conn > C_CONNECTED) {
1492                 retcode = ERR_RESIZE_RESYNC;
1493                 goto fail;
1494         }
1495
1496         if (mdev->state.role == R_SECONDARY &&
1497             mdev->state.peer == R_SECONDARY) {
1498                 retcode = ERR_NO_PRIMARY;
1499                 goto fail;
1500         }
1501
1502         if (!get_ldev(mdev)) {
1503                 retcode = ERR_NO_DISK;
1504                 goto fail;
1505         }
1506
1507         if (rs.no_resync && mdev->agreed_pro_version < 93) {
1508                 retcode = ERR_NEED_APV_93;
1509                 goto fail;
1510         }
1511
1512         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
1513                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
1514
1515         mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
1516         ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
1517         dd = drbd_determin_dev_size(mdev, ddsf);
1518         drbd_md_sync(mdev);
1519         put_ldev(mdev);
1520         if (dd == dev_size_error) {
1521                 retcode = ERR_NOMEM_BITMAP;
1522                 goto fail;
1523         }
1524
1525         if (mdev->state.conn == C_CONNECTED) {
1526                 if (dd == grew)
1527                         set_bit(RESIZE_PENDING, &mdev->flags);
1528
1529                 drbd_send_uuids(mdev);
1530                 drbd_send_sizes(mdev, 1, ddsf);
1531         }
1532
1533  fail:
1534         reply->ret_code = retcode;
1535         return 0;
1536 }
1537
1538 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1539                                struct drbd_nl_cfg_reply *reply)
1540 {
1541         int retcode = NO_ERROR;
1542         int err;
1543         int ovr; /* online verify running */
1544         int rsr; /* re-sync running */
1545         struct crypto_hash *verify_tfm = NULL;
1546         struct crypto_hash *csums_tfm = NULL;
1547         struct syncer_conf sc;
1548         cpumask_var_t new_cpu_mask;
1549
1550         if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1551                 retcode = ERR_NOMEM;
1552                 goto fail;
1553         }
1554
1555         if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1556                 memset(&sc, 0, sizeof(struct syncer_conf));
1557                 sc.rate       = DRBD_RATE_DEF;
1558                 sc.after      = DRBD_AFTER_DEF;
1559                 sc.al_extents = DRBD_AL_EXTENTS_DEF;
1560         } else
1561                 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1562
1563         if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1564                 retcode = ERR_MANDATORY_TAG;
1565                 goto fail;
1566         }
1567
1568         /* re-sync running */
1569         rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1570                 mdev->state.conn == C_SYNC_TARGET ||
1571                 mdev->state.conn == C_PAUSED_SYNC_S ||
1572                 mdev->state.conn == C_PAUSED_SYNC_T );
1573
1574         if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1575                 retcode = ERR_CSUMS_RESYNC_RUNNING;
1576                 goto fail;
1577         }
1578
1579         if (!rsr && sc.csums_alg[0]) {
1580                 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1581                 if (IS_ERR(csums_tfm)) {
1582                         csums_tfm = NULL;
1583                         retcode = ERR_CSUMS_ALG;
1584                         goto fail;
1585                 }
1586
1587                 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1588                         retcode = ERR_CSUMS_ALG_ND;
1589                         goto fail;
1590                 }
1591         }
1592
1593         /* online verify running */
1594         ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1595
1596         if (ovr) {
1597                 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1598                         retcode = ERR_VERIFY_RUNNING;
1599                         goto fail;
1600                 }
1601         }
1602
1603         if (!ovr && sc.verify_alg[0]) {
1604                 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1605                 if (IS_ERR(verify_tfm)) {
1606                         verify_tfm = NULL;
1607                         retcode = ERR_VERIFY_ALG;
1608                         goto fail;
1609                 }
1610
1611                 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1612                         retcode = ERR_VERIFY_ALG_ND;
1613                         goto fail;
1614                 }
1615         }
1616
1617         /* silently ignore cpu mask on UP kernel */
1618         if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1619                 err = __bitmap_parse(sc.cpu_mask, 32, 0,
1620                                 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1621                 if (err) {
1622                         dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1623                         retcode = ERR_CPU_MASK_PARSE;
1624                         goto fail;
1625                 }
1626         }
1627
1628         ERR_IF (sc.rate < 1) sc.rate = 1;
1629         ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
1630 #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1631         if (sc.al_extents > AL_MAX) {
1632                 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1633                 sc.al_extents = AL_MAX;
1634         }
1635 #undef AL_MAX
1636
1637         /* most sanity checks done, try to assign the new sync-after
1638          * dependency.  need to hold the global lock in there,
1639          * to avoid a race in the dependency loop check. */
1640         retcode = drbd_alter_sa(mdev, sc.after);
1641         if (retcode != NO_ERROR)
1642                 goto fail;
1643
1644         /* ok, assign the rest of it as well.
1645          * lock against receive_SyncParam() */
1646         spin_lock(&mdev->peer_seq_lock);
1647         mdev->sync_conf = sc;
1648
1649         if (!rsr) {
1650                 crypto_free_hash(mdev->csums_tfm);
1651                 mdev->csums_tfm = csums_tfm;
1652                 csums_tfm = NULL;
1653         }
1654
1655         if (!ovr) {
1656                 crypto_free_hash(mdev->verify_tfm);
1657                 mdev->verify_tfm = verify_tfm;
1658                 verify_tfm = NULL;
1659         }
1660         spin_unlock(&mdev->peer_seq_lock);
1661
1662         if (get_ldev(mdev)) {
1663                 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1664                 drbd_al_shrink(mdev);
1665                 err = drbd_check_al_size(mdev);
1666                 lc_unlock(mdev->act_log);
1667                 wake_up(&mdev->al_wait);
1668
1669                 put_ldev(mdev);
1670                 drbd_md_sync(mdev);
1671
1672                 if (err) {
1673                         retcode = ERR_NOMEM;
1674                         goto fail;
1675                 }
1676         }
1677
1678         if (mdev->state.conn >= C_CONNECTED)
1679                 drbd_send_sync_param(mdev, &sc);
1680
1681         if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
1682                 cpumask_copy(mdev->cpu_mask, new_cpu_mask);
1683                 drbd_calc_cpu_mask(mdev);
1684                 mdev->receiver.reset_cpu_mask = 1;
1685                 mdev->asender.reset_cpu_mask = 1;
1686                 mdev->worker.reset_cpu_mask = 1;
1687         }
1688
1689         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1690 fail:
1691         free_cpumask_var(new_cpu_mask);
1692         crypto_free_hash(csums_tfm);
1693         crypto_free_hash(verify_tfm);
1694         reply->ret_code = retcode;
1695         return 0;
1696 }
1697
1698 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1699                               struct drbd_nl_cfg_reply *reply)
1700 {
1701         int retcode;
1702
1703         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1704
1705         if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1706                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1707
1708         while (retcode == SS_NEED_CONNECTION) {
1709                 spin_lock_irq(&mdev->req_lock);
1710                 if (mdev->state.conn < C_CONNECTED)
1711                         retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1712                 spin_unlock_irq(&mdev->req_lock);
1713
1714                 if (retcode != SS_NEED_CONNECTION)
1715                         break;
1716
1717                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1718         }
1719
1720         reply->ret_code = retcode;
1721         return 0;
1722 }
1723
1724 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1725                                    struct drbd_nl_cfg_reply *reply)
1726 {
1727
1728         reply->ret_code = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1729
1730         return 0;
1731 }
1732
1733 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1734                               struct drbd_nl_cfg_reply *reply)
1735 {
1736         int retcode = NO_ERROR;
1737
1738         if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1739                 retcode = ERR_PAUSE_IS_SET;
1740
1741         reply->ret_code = retcode;
1742         return 0;
1743 }
1744
1745 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1746                                struct drbd_nl_cfg_reply *reply)
1747 {
1748         int retcode = NO_ERROR;
1749
1750         if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO)
1751                 retcode = ERR_PAUSE_IS_CLEAR;
1752
1753         reply->ret_code = retcode;
1754         return 0;
1755 }
1756
1757 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1758                               struct drbd_nl_cfg_reply *reply)
1759 {
1760         reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1761
1762         return 0;
1763 }
1764
1765 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1766                              struct drbd_nl_cfg_reply *reply)
1767 {
1768         reply->ret_code = drbd_request_state(mdev, NS(susp, 0));
1769         return 0;
1770 }
1771
1772 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1773                            struct drbd_nl_cfg_reply *reply)
1774 {
1775         reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
1776         return 0;
1777 }
1778
1779 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1780                            struct drbd_nl_cfg_reply *reply)
1781 {
1782         unsigned short *tl;
1783
1784         tl = reply->tag_list;
1785
1786         if (get_ldev(mdev)) {
1787                 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
1788                 put_ldev(mdev);
1789         }
1790
1791         if (get_net_conf(mdev)) {
1792                 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
1793                 put_net_conf(mdev);
1794         }
1795         tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
1796
1797         put_unaligned(TT_END, tl++); /* Close the tag list */
1798
1799         return (int)((char *)tl - (char *)reply->tag_list);
1800 }
1801
1802 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1803                              struct drbd_nl_cfg_reply *reply)
1804 {
1805         unsigned short *tl = reply->tag_list;
1806         union drbd_state s = mdev->state;
1807         unsigned long rs_left;
1808         unsigned int res;
1809
1810         tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
1811
1812         /* no local ref, no bitmap, no syncer progress. */
1813         if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
1814                 if (get_ldev(mdev)) {
1815                         drbd_get_syncer_progress(mdev, &rs_left, &res);
1816                         tl = tl_add_int(tl, T_sync_progress, &res);
1817                         put_ldev(mdev);
1818                 }
1819         }
1820         put_unaligned(TT_END, tl++); /* Close the tag list */
1821
1822         return (int)((char *)tl - (char *)reply->tag_list);
1823 }
1824
1825 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1826                              struct drbd_nl_cfg_reply *reply)
1827 {
1828         unsigned short *tl;
1829
1830         tl = reply->tag_list;
1831
1832         if (get_ldev(mdev)) {
1833                 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
1834                 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
1835                 put_ldev(mdev);
1836         }
1837         put_unaligned(TT_END, tl++); /* Close the tag list */
1838
1839         return (int)((char *)tl - (char *)reply->tag_list);
1840 }
1841
1842 /**
1843  * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
1844  * @mdev:       DRBD device.
1845  * @nlp:        Netlink/connector packet from drbdsetup
1846  * @reply:      Reply packet for drbdsetup
1847  */
1848 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1849                                     struct drbd_nl_cfg_reply *reply)
1850 {
1851         unsigned short *tl;
1852         char rv;
1853
1854         tl = reply->tag_list;
1855
1856         rv = mdev->state.pdsk == D_OUTDATED        ? UT_PEER_OUTDATED :
1857           test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
1858
1859         tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
1860         put_unaligned(TT_END, tl++); /* Close the tag list */
1861
1862         return (int)((char *)tl - (char *)reply->tag_list);
1863 }
1864
1865 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1866                                     struct drbd_nl_cfg_reply *reply)
1867 {
1868         /* default to resume from last known position, if possible */
1869         struct start_ov args =
1870                 { .start_sector = mdev->ov_start_sector };
1871
1872         if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
1873                 reply->ret_code = ERR_MANDATORY_TAG;
1874                 return 0;
1875         }
1876         /* w_make_ov_request expects position to be aligned */
1877         mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
1878         reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
1879         return 0;
1880 }
1881
1882
1883 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1884                               struct drbd_nl_cfg_reply *reply)
1885 {
1886         int retcode = NO_ERROR;
1887         int skip_initial_sync = 0;
1888         int err;
1889
1890         struct new_c_uuid args;
1891
1892         memset(&args, 0, sizeof(struct new_c_uuid));
1893         if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
1894                 reply->ret_code = ERR_MANDATORY_TAG;
1895                 return 0;
1896         }
1897
1898         mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
1899
1900         if (!get_ldev(mdev)) {
1901                 retcode = ERR_NO_DISK;
1902                 goto out;
1903         }
1904
1905         /* this is "skip initial sync", assume to be clean */
1906         if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
1907             mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
1908                 dev_info(DEV, "Preparing to skip initial sync\n");
1909                 skip_initial_sync = 1;
1910         } else if (mdev->state.conn != C_STANDALONE) {
1911                 retcode = ERR_CONNECTED;
1912                 goto out_dec;
1913         }
1914
1915         drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
1916         drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
1917
1918         if (args.clear_bm) {
1919                 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
1920                 if (err) {
1921                         dev_err(DEV, "Writing bitmap failed with %d\n",err);
1922                         retcode = ERR_IO_MD_DISK;
1923                 }
1924                 if (skip_initial_sync) {
1925                         drbd_send_uuids_skip_initial_sync(mdev);
1926                         _drbd_uuid_set(mdev, UI_BITMAP, 0);
1927                         spin_lock_irq(&mdev->req_lock);
1928                         _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
1929                                         CS_VERBOSE, NULL);
1930                         spin_unlock_irq(&mdev->req_lock);
1931                 }
1932         }
1933
1934         drbd_md_sync(mdev);
1935 out_dec:
1936         put_ldev(mdev);
1937 out:
1938         mutex_unlock(&mdev->state_mutex);
1939
1940         reply->ret_code = retcode;
1941         return 0;
1942 }
1943
1944 static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp)
1945 {
1946         struct drbd_conf *mdev;
1947
1948         if (nlp->drbd_minor >= minor_count)
1949                 return NULL;
1950
1951         mdev = minor_to_mdev(nlp->drbd_minor);
1952
1953         if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) {
1954                 struct gendisk *disk = NULL;
1955                 mdev = drbd_new_device(nlp->drbd_minor);
1956
1957                 spin_lock_irq(&drbd_pp_lock);
1958                 if (minor_table[nlp->drbd_minor] == NULL) {
1959                         minor_table[nlp->drbd_minor] = mdev;
1960                         disk = mdev->vdisk;
1961                         mdev = NULL;
1962                 } /* else: we lost the race */
1963                 spin_unlock_irq(&drbd_pp_lock);
1964
1965                 if (disk) /* we won the race above */
1966                         /* in case we ever add a drbd_delete_device(),
1967                          * don't forget the del_gendisk! */
1968                         add_disk(disk);
1969                 else /* we lost the race above */
1970                         drbd_free_mdev(mdev);
1971
1972                 mdev = minor_to_mdev(nlp->drbd_minor);
1973         }
1974
1975         return mdev;
1976 }
1977
1978 struct cn_handler_struct {
1979         int (*function)(struct drbd_conf *,
1980                          struct drbd_nl_cfg_req *,
1981                          struct drbd_nl_cfg_reply *);
1982         int reply_body_size;
1983 };
1984
1985 static struct cn_handler_struct cnd_table[] = {
1986         [ P_primary ]           = { &drbd_nl_primary,           0 },
1987         [ P_secondary ]         = { &drbd_nl_secondary,         0 },
1988         [ P_disk_conf ]         = { &drbd_nl_disk_conf,         0 },
1989         [ P_detach ]            = { &drbd_nl_detach,            0 },
1990         [ P_net_conf ]          = { &drbd_nl_net_conf,          0 },
1991         [ P_disconnect ]        = { &drbd_nl_disconnect,        0 },
1992         [ P_resize ]            = { &drbd_nl_resize,            0 },
1993         [ P_syncer_conf ]       = { &drbd_nl_syncer_conf,       0 },
1994         [ P_invalidate ]        = { &drbd_nl_invalidate,        0 },
1995         [ P_invalidate_peer ]   = { &drbd_nl_invalidate_peer,   0 },
1996         [ P_pause_sync ]        = { &drbd_nl_pause_sync,        0 },
1997         [ P_resume_sync ]       = { &drbd_nl_resume_sync,       0 },
1998         [ P_suspend_io ]        = { &drbd_nl_suspend_io,        0 },
1999         [ P_resume_io ]         = { &drbd_nl_resume_io,         0 },
2000         [ P_outdate ]           = { &drbd_nl_outdate,           0 },
2001         [ P_get_config ]        = { &drbd_nl_get_config,
2002                                     sizeof(struct syncer_conf_tag_len_struct) +
2003                                     sizeof(struct disk_conf_tag_len_struct) +
2004                                     sizeof(struct net_conf_tag_len_struct) },
2005         [ P_get_state ]         = { &drbd_nl_get_state,
2006                                     sizeof(struct get_state_tag_len_struct) +
2007                                     sizeof(struct sync_progress_tag_len_struct) },
2008         [ P_get_uuids ]         = { &drbd_nl_get_uuids,
2009                                     sizeof(struct get_uuids_tag_len_struct) },
2010         [ P_get_timeout_flag ]  = { &drbd_nl_get_timeout_flag,
2011                                     sizeof(struct get_timeout_flag_tag_len_struct)},
2012         [ P_start_ov ]          = { &drbd_nl_start_ov,          0 },
2013         [ P_new_c_uuid ]        = { &drbd_nl_new_c_uuid,        0 },
2014 };
2015
2016 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
2017 {
2018         struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2019         struct cn_handler_struct *cm;
2020         struct cn_msg *cn_reply;
2021         struct drbd_nl_cfg_reply *reply;
2022         struct drbd_conf *mdev;
2023         int retcode, rr;
2024         int reply_size = sizeof(struct cn_msg)
2025                 + sizeof(struct drbd_nl_cfg_reply)
2026                 + sizeof(short int);
2027
2028         if (!try_module_get(THIS_MODULE)) {
2029                 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2030                 return;
2031         }
2032
2033         if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) {
2034                 retcode = ERR_PERM;
2035                 goto fail;
2036         }
2037
2038         mdev = ensure_mdev(nlp);
2039         if (!mdev) {
2040                 retcode = ERR_MINOR_INVALID;
2041                 goto fail;
2042         }
2043
2044         if (nlp->packet_type >= P_nl_after_last_packet) {
2045                 retcode = ERR_PACKET_NR;
2046                 goto fail;
2047         }
2048
2049         cm = cnd_table + nlp->packet_type;
2050
2051         /* This may happen if packet number is 0: */
2052         if (cm->function == NULL) {
2053                 retcode = ERR_PACKET_NR;
2054                 goto fail;
2055         }
2056
2057         reply_size += cm->reply_body_size;
2058
2059         /* allocation not in the IO path, cqueue thread context */
2060         cn_reply = kmalloc(reply_size, GFP_KERNEL);
2061         if (!cn_reply) {
2062                 retcode = ERR_NOMEM;
2063                 goto fail;
2064         }
2065         reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2066
2067         reply->packet_type =
2068                 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
2069         reply->minor = nlp->drbd_minor;
2070         reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2071         /* reply->tag_list; might be modified by cm->function. */
2072
2073         rr = cm->function(mdev, nlp, reply);
2074
2075         cn_reply->id = req->id;
2076         cn_reply->seq = req->seq;
2077         cn_reply->ack = req->ack  + 1;
2078         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2079         cn_reply->flags = 0;
2080
2081         rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2082         if (rr && rr != -ESRCH)
2083                 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2084
2085         kfree(cn_reply);
2086         module_put(THIS_MODULE);
2087         return;
2088  fail:
2089         drbd_nl_send_reply(req, retcode);
2090         module_put(THIS_MODULE);
2091 }
2092
2093 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2094
2095 static unsigned short *
2096 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2097         unsigned short len, int nul_terminated)
2098 {
2099         unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2100         len = (len < l) ? len :  l;
2101         put_unaligned(tag, tl++);
2102         put_unaligned(len, tl++);
2103         memcpy(tl, data, len);
2104         tl = (unsigned short*)((char*)tl + len);
2105         if (nul_terminated)
2106                 *((char*)tl - 1) = 0;
2107         return tl;
2108 }
2109
2110 static unsigned short *
2111 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2112 {
2113         return __tl_add_blob(tl, tag, data, len, 0);
2114 }
2115
2116 static unsigned short *
2117 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2118 {
2119         return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2120 }
2121
2122 static unsigned short *
2123 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2124 {
2125         put_unaligned(tag, tl++);
2126         switch(tag_type(tag)) {
2127         case TT_INTEGER:
2128                 put_unaligned(sizeof(int), tl++);
2129                 put_unaligned(*(int *)val, (int *)tl);
2130                 tl = (unsigned short*)((char*)tl+sizeof(int));
2131                 break;
2132         case TT_INT64:
2133                 put_unaligned(sizeof(u64), tl++);
2134                 put_unaligned(*(u64 *)val, (u64 *)tl);
2135                 tl = (unsigned short*)((char*)tl+sizeof(u64));
2136                 break;
2137         default:
2138                 /* someone did something stupid. */
2139                 ;
2140         }
2141         return tl;
2142 }
2143
2144 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2145 {
2146         char buffer[sizeof(struct cn_msg)+
2147                     sizeof(struct drbd_nl_cfg_reply)+
2148                     sizeof(struct get_state_tag_len_struct)+
2149                     sizeof(short int)];
2150         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2151         struct drbd_nl_cfg_reply *reply =
2152                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2153         unsigned short *tl = reply->tag_list;
2154
2155         /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2156
2157         tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2158
2159         put_unaligned(TT_END, tl++); /* Close the tag list */
2160
2161         cn_reply->id.idx = CN_IDX_DRBD;
2162         cn_reply->id.val = CN_VAL_DRBD;
2163
2164         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2165         cn_reply->ack = 0; /* not used here. */
2166         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2167                 (int)((char *)tl - (char *)reply->tag_list);
2168         cn_reply->flags = 0;
2169
2170         reply->packet_type = P_get_state;
2171         reply->minor = mdev_to_minor(mdev);
2172         reply->ret_code = NO_ERROR;
2173
2174         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2175 }
2176
2177 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2178 {
2179         char buffer[sizeof(struct cn_msg)+
2180                     sizeof(struct drbd_nl_cfg_reply)+
2181                     sizeof(struct call_helper_tag_len_struct)+
2182                     sizeof(short int)];
2183         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2184         struct drbd_nl_cfg_reply *reply =
2185                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2186         unsigned short *tl = reply->tag_list;
2187
2188         /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2189
2190         tl = tl_add_str(tl, T_helper, helper_name);
2191         put_unaligned(TT_END, tl++); /* Close the tag list */
2192
2193         cn_reply->id.idx = CN_IDX_DRBD;
2194         cn_reply->id.val = CN_VAL_DRBD;
2195
2196         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2197         cn_reply->ack = 0; /* not used here. */
2198         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2199                 (int)((char *)tl - (char *)reply->tag_list);
2200         cn_reply->flags = 0;
2201
2202         reply->packet_type = P_call_helper;
2203         reply->minor = mdev_to_minor(mdev);
2204         reply->ret_code = NO_ERROR;
2205
2206         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2207 }
2208
2209 void drbd_bcast_ee(struct drbd_conf *mdev,
2210                 const char *reason, const int dgs,
2211                 const char* seen_hash, const char* calc_hash,
2212                 const struct drbd_epoch_entry* e)
2213 {
2214         struct cn_msg *cn_reply;
2215         struct drbd_nl_cfg_reply *reply;
2216         unsigned short *tl;
2217         struct page *page;
2218         unsigned len;
2219
2220         if (!e)
2221                 return;
2222         if (!reason || !reason[0])
2223                 return;
2224
2225         /* apparently we have to memcpy twice, first to prepare the data for the
2226          * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2227          * netlink skb. */
2228         /* receiver thread context, which is not in the writeout path (of this node),
2229          * but may be in the writeout path of the _other_ node.
2230          * GFP_NOIO to avoid potential "distributed deadlock". */
2231         cn_reply = kmalloc(
2232                 sizeof(struct cn_msg)+
2233                 sizeof(struct drbd_nl_cfg_reply)+
2234                 sizeof(struct dump_ee_tag_len_struct)+
2235                 sizeof(short int),
2236                 GFP_NOIO);
2237
2238         if (!cn_reply) {
2239                 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2240                                 (unsigned long long)e->sector, e->size);
2241                 return;
2242         }
2243
2244         reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2245         tl = reply->tag_list;
2246
2247         tl = tl_add_str(tl, T_dump_ee_reason, reason);
2248         tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2249         tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2250         tl = tl_add_int(tl, T_ee_sector, &e->sector);
2251         tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2252
2253         put_unaligned(T_ee_data, tl++);
2254         put_unaligned(e->size, tl++);
2255
2256         len = e->size;
2257         page = e->pages;
2258         page_chain_for_each(page) {
2259                 void *d = kmap_atomic(page, KM_USER0);
2260                 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2261                 memcpy(tl, d, l);
2262                 kunmap_atomic(d, KM_USER0);
2263                 tl = (unsigned short*)((char*)tl + l);
2264                 len -= l;
2265         }
2266         put_unaligned(TT_END, tl++); /* Close the tag list */
2267
2268         cn_reply->id.idx = CN_IDX_DRBD;
2269         cn_reply->id.val = CN_VAL_DRBD;
2270
2271         cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2272         cn_reply->ack = 0; // not used here.
2273         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2274                 (int)((char*)tl - (char*)reply->tag_list);
2275         cn_reply->flags = 0;
2276
2277         reply->packet_type = P_dump_ee;
2278         reply->minor = mdev_to_minor(mdev);
2279         reply->ret_code = NO_ERROR;
2280
2281         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2282         kfree(cn_reply);
2283 }
2284
2285 void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2286 {
2287         char buffer[sizeof(struct cn_msg)+
2288                     sizeof(struct drbd_nl_cfg_reply)+
2289                     sizeof(struct sync_progress_tag_len_struct)+
2290                     sizeof(short int)];
2291         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2292         struct drbd_nl_cfg_reply *reply =
2293                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2294         unsigned short *tl = reply->tag_list;
2295         unsigned long rs_left;
2296         unsigned int res;
2297
2298         /* no local ref, no bitmap, no syncer progress, no broadcast. */
2299         if (!get_ldev(mdev))
2300                 return;
2301         drbd_get_syncer_progress(mdev, &rs_left, &res);
2302         put_ldev(mdev);
2303
2304         tl = tl_add_int(tl, T_sync_progress, &res);
2305         put_unaligned(TT_END, tl++); /* Close the tag list */
2306
2307         cn_reply->id.idx = CN_IDX_DRBD;
2308         cn_reply->id.val = CN_VAL_DRBD;
2309
2310         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2311         cn_reply->ack = 0; /* not used here. */
2312         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2313                 (int)((char *)tl - (char *)reply->tag_list);
2314         cn_reply->flags = 0;
2315
2316         reply->packet_type = P_sync_progress;
2317         reply->minor = mdev_to_minor(mdev);
2318         reply->ret_code = NO_ERROR;
2319
2320         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2321 }
2322
2323 int __init drbd_nl_init(void)
2324 {
2325         static struct cb_id cn_id_drbd;
2326         int err, try=10;
2327
2328         cn_id_drbd.val = CN_VAL_DRBD;
2329         do {
2330                 cn_id_drbd.idx = cn_idx;
2331                 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2332                 if (!err)
2333                         break;
2334                 cn_idx = (cn_idx + CN_IDX_STEP);
2335         } while (try--);
2336
2337         if (err) {
2338                 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2339                 return err;
2340         }
2341
2342         return 0;
2343 }
2344
2345 void drbd_nl_cleanup(void)
2346 {
2347         static struct cb_id cn_id_drbd;
2348
2349         cn_id_drbd.idx = cn_idx;
2350         cn_id_drbd.val = CN_VAL_DRBD;
2351
2352         cn_del_callback(&cn_id_drbd);
2353 }
2354
2355 void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2356 {
2357         char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2358         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2359         struct drbd_nl_cfg_reply *reply =
2360                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2361         int rr;
2362
2363         cn_reply->id = req->id;
2364
2365         cn_reply->seq = req->seq;
2366         cn_reply->ack = req->ack  + 1;
2367         cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2368         cn_reply->flags = 0;
2369
2370         reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2371         reply->ret_code = ret_code;
2372
2373         rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2374         if (rr && rr != -ESRCH)
2375                 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2376 }
2377