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_req.h"
  37 #include "drbd_wrappers.h"
  38 #include <asm/unaligned.h>
  39 #include <linux/drbd_tag_magic.h>
  40 #include <linux/drbd_limits.h>
  41 #include <linux/compiler.h>
  42 #include <linux/kthread.h>
  43
  44 static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int);
  45 static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *);
  46 static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *);
  47
  48 /* see get_sb_bdev and bd_claim */
  49 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
  50
  51 /* Generate the tag_list to struct functions */
  52 #define NL_PACKET(name, number, fields) \
  53 static int name ## _from_tags(struct drbd_conf *mdev, \
  54         unsigned short *tags, struct name *arg) __attribute__ ((unused)); \
  55 static int name ## _from_tags(struct drbd_conf *mdev, \
  56         unsigned short *tags, struct name *arg) \
  57 { \
  58         int tag; \
  59         int dlen; \
  60         \
  61         while ((tag = get_unaligned(tags++)) != TT_END) {       \
  62                 dlen = get_unaligned(tags++);                   \
  63                 switch (tag_number(tag)) { \
  64                 fields \
  65                 default: \
  66                         if (tag & T_MANDATORY) { \
  67                                 dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \
  68                                 return 0; \
  69                         } \
  70                 } \
  71                 tags = (unsigned short *)((char *)tags + dlen); \
  72         } \
  73         return 1; \
  74 }
  75 #define NL_INTEGER(pn, pr, member) \
  76         case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \
  77                 arg->member = get_unaligned((int *)(tags));     \
  78                 break;
  79 #define NL_INT64(pn, pr, member) \
  80         case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \
  81                 arg->member = get_unaligned((u64 *)(tags));     \
  82                 break;
  83 #define NL_BIT(pn, pr, member) \
  84         case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \
  85                 arg->member = *(char *)(tags) ? 1 : 0; \
  86                 break;
  87 #define NL_STRING(pn, pr, member, len) \
  88         case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \
  89                 if (dlen > len) { \
  90                         dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \
  91                                 #member, dlen, (unsigned int)len); \
  92                         return 0; \
  93                 } \
  94                  arg->member ## _len = dlen; \
  95                  memcpy(arg->member, tags, min_t(size_t, dlen, len)); \
  96                  break;
  97 #include <linux/drbd_nl.h>
  98
  99 /* Generate the struct to tag_list functions */
 100 #define NL_PACKET(name, number, fields) \
 101 static unsigned short* \
 102 name ## _to_tags(struct drbd_conf *mdev, \
 103         struct name *arg, unsigned short *tags) __attribute__ ((unused)); \
 104 static unsigned short* \
 105 name ## _to_tags(struct drbd_conf *mdev, \
 106         struct name *arg, unsigned short *tags) \
 107 { \
 108         fields \
 109         return tags; \
 110 }
 111
 112 #define NL_INTEGER(pn, pr, member) \
 113         put_unaligned(pn | pr | TT_INTEGER, tags++);    \
 114         put_unaligned(sizeof(int), tags++);             \
 115         put_unaligned(arg->member, (int *)tags);        \
 116         tags = (unsigned short *)((char *)tags+sizeof(int));
 117 #define NL_INT64(pn, pr, member) \
 118         put_unaligned(pn | pr | TT_INT64, tags++);      \
 119         put_unaligned(sizeof(u64), tags++);             \
 120         put_unaligned(arg->member, (u64 *)tags);        \
 121         tags = (unsigned short *)((char *)tags+sizeof(u64));
 122 #define NL_BIT(pn, pr, member) \
 123         put_unaligned(pn | pr | TT_BIT, tags++);        \
 124         put_unaligned(sizeof(char), tags++);            \
 125         *(char *)tags = arg->member; \
 126         tags = (unsigned short *)((char *)tags+sizeof(char));
 127 #define NL_STRING(pn, pr, member, len) \
 128         put_unaligned(pn | pr | TT_STRING, tags++);     \
 129         put_unaligned(arg->member ## _len, tags++);     \
 130         memcpy(tags, arg->member, arg->member ## _len); \
 131         tags = (unsigned short *)((char *)tags + arg->member ## _len);
 132 #include <linux/drbd_nl.h>
 133
 134 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name);
 135 void drbd_nl_send_reply(struct cn_msg *, int);
 136
 137 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
 138 {
 139         char *envp[] = { "HOME=/",
 140                         "TERM=linux",
 141                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 142                         NULL, /* Will be set to address family */
 143                         NULL, /* Will be set to address */
 144                         NULL };
 145
 146         char mb[12], af[20], ad[60], *afs;
 147         char *argv[] = {usermode_helper, cmd, mb, NULL };
 148         int ret;
 149
 150         snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
 151
 152         if (get_net_conf(mdev)) {
 153                 switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) {
 154                 case AF_INET6:
 155                         afs = "ipv6";
 156                         snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6",
 157                                  &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr);
 158                         break;
 159                 case AF_INET:
 160                         afs = "ipv4";
 161                         snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
 162                                  &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
 163                         break;
 164                 default:
 165                         afs = "ssocks";
 166                         snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
 167                                  &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
 168                 }
 169                 snprintf(af, 20, "DRBD_PEER_AF=%s", afs);
 170                 envp[3]=af;
 171                 envp[4]=ad;
 172                 put_net_conf(mdev);
 173         }
 174
 175         /* The helper may take some time.
 176          * write out any unsynced meta data changes now */
 177         drbd_md_sync(mdev);
 178
 179         dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
 180
 181         drbd_bcast_ev_helper(mdev, cmd);
 182         ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
 183         if (ret)
 184                 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 185                                 usermode_helper, cmd, mb,
 186                                 (ret >> 8) & 0xff, ret);
 187         else
 188                 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 189                                 usermode_helper, cmd, mb,
 190                                 (ret >> 8) & 0xff, ret);
 191
 192         if (ret < 0) /* Ignore any ERRNOs we got. */
 193                 ret = 0;
 194
 195         return ret;
 196 }
 197
 198 enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
 199 {
 200         char *ex_to_string;
 201         int r;
 202         enum drbd_disk_state nps;
 203         enum drbd_fencing_p fp;
 204
 205         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 206
 207         if (get_ldev_if_state(mdev, D_CONSISTENT)) {
 208                 fp = mdev->ldev->dc.fencing;
 209                 put_ldev(mdev);
 210         } else {
 211                 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
 212                 nps = mdev->state.pdsk;
 213                 goto out;
 214         }
 215
 216         r = drbd_khelper(mdev, "fence-peer");
 217
 218         switch ((r>>8) & 0xff) {
 219         case 3: /* peer is inconsistent */
 220                 ex_to_string = "peer is inconsistent or worse";
 221                 nps = D_INCONSISTENT;
 222                 break;
 223         case 4: /* peer got outdated, or was already outdated */
 224                 ex_to_string = "peer was fenced";
 225                 nps = D_OUTDATED;
 226                 break;
 227         case 5: /* peer was down */
 228                 if (mdev->state.disk == D_UP_TO_DATE) {
 229                         /* we will(have) create(d) a new UUID anyways... */
 230                         ex_to_string = "peer is unreachable, assumed to be dead";
 231                         nps = D_OUTDATED;
 232                 } else {
 233                         ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
 234                         nps = mdev->state.pdsk;
 235                 }
 236                 break;
 237         case 6: /* Peer is primary, voluntarily outdate myself.
 238                  * This is useful when an unconnected R_SECONDARY is asked to
 239                  * become R_PRIMARY, but finds the other peer being active. */
 240                 ex_to_string = "peer is active";
 241                 dev_warn(DEV, "Peer is primary, outdating myself.\n");
 242                 nps = D_UNKNOWN;
 243                 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
 244                 break;
 245         case 7:
 246                 if (fp != FP_STONITH)
 247                         dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
 248                 ex_to_string = "peer was stonithed";
 249                 nps = D_OUTDATED;
 250                 break;
 251         default:
 252                 /* The script is broken ... */
 253                 nps = D_UNKNOWN;
 254                 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
 255                 return nps;
 256         }
 257
 258         dev_info(DEV, "fence-peer helper returned %d (%s)\n",
 259                         (r>>8) & 0xff, ex_to_string);
 260
 261 out:
 262         if (mdev->state.susp_fen && nps >= D_UNKNOWN) {
 263                 /* The handler was not successful... unfreeze here, the
 264                    state engine can not unfreeze... */
 265                 _drbd_request_state(mdev, NS(susp_fen, 0), CS_VERBOSE);
 266         }
 267
 268         return nps;
 269 }
 270
 271 static int _try_outdate_peer_async(void *data)
 272 {
 273         struct drbd_conf *mdev = (struct drbd_conf *)data;
 274         enum drbd_disk_state nps;
 275         union drbd_state ns;
 276
 277         nps = drbd_try_outdate_peer(mdev);
 278
 279         /* Not using
 280            drbd_request_state(mdev, NS(pdsk, nps));
 281            here, because we might were able to re-establish the connection
 282            in the meantime. This can only partially be solved in the state's
 283            engine is_valid_state() and is_valid_state_transition()
 284            functions.
 285
 286            nps can be D_INCONSISTENT, D_OUTDATED or D_UNKNOWN.
 287            pdsk == D_INCONSISTENT while conn >= C_CONNECTED is valid,
 288            therefore we have to have the pre state change check here.
 289         */
 290         spin_lock_irq(&mdev->req_lock);
 291         ns = mdev->state;
 292         if (ns.conn < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &mdev->flags)) {
 293                 ns.pdsk = nps;
 294                 _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
 295         }
 296         spin_unlock_irq(&mdev->req_lock);
 297
 298         return 0;
 299 }
 300
 301 void drbd_try_outdate_peer_async(struct drbd_conf *mdev)
 302 {
 303         struct task_struct *opa;
 304
 305         opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev));
 306         if (IS_ERR(opa))
 307                 dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n");
 308 }
 309
 310 enum drbd_state_rv
 311 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
 312 {
 313         const int max_tries = 4;
 314         enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
 315         int try = 0;
 316         int forced = 0;
 317         union drbd_state mask, val;
 318         enum drbd_disk_state nps;
 319
 320         if (new_role == R_PRIMARY)
 321                 request_ping(mdev); /* Detect a dead peer ASAP */
 322
 323         mutex_lock(&mdev->state_mutex);
 324
 325         mask.i = 0; mask.role = R_MASK;
 326         val.i  = 0; val.role  = new_role;
 327
 328         while (try++ < max_tries) {
 329                 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
 330
 331                 /* in case we first succeeded to outdate,
 332                  * but now suddenly could establish a connection */
 333                 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
 334                         val.pdsk = 0;
 335                         mask.pdsk = 0;
 336                         continue;
 337                 }
 338
 339                 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
 340                     (mdev->state.disk < D_UP_TO_DATE &&
 341                      mdev->state.disk >= D_INCONSISTENT)) {
 342                         mask.disk = D_MASK;
 343                         val.disk  = D_UP_TO_DATE;
 344                         forced = 1;
 345                         continue;
 346                 }
 347
 348                 if (rv == SS_NO_UP_TO_DATE_DISK &&
 349                     mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
 350                         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 351                         nps = drbd_try_outdate_peer(mdev);
 352
 353                         if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
 354                                 val.disk = D_UP_TO_DATE;
 355                                 mask.disk = D_MASK;
 356                         }
 357
 358                         val.pdsk = nps;
 359                         mask.pdsk = D_MASK;
 360
 361                         continue;
 362                 }
 363
 364                 if (rv == SS_NOTHING_TO_DO)
 365                         goto fail;
 366                 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
 367                         nps = drbd_try_outdate_peer(mdev);
 368
 369                         if (force && nps > D_OUTDATED) {
 370                                 dev_warn(DEV, "Forced into split brain situation!\n");
 371                                 nps = D_OUTDATED;
 372                         }
 373
 374                         mask.pdsk = D_MASK;
 375                         val.pdsk  = nps;
 376
 377                         continue;
 378                 }
 379                 if (rv == SS_TWO_PRIMARIES) {
 380                         /* Maybe the peer is detected as dead very soon...
 381                            retry at most once more in this case. */
 382                         schedule_timeout_interruptible((mdev->net_conf->ping_timeo+1)*HZ/10);
 383                         if (try < max_tries)
 384                                 try = max_tries - 1;
 385                         continue;
 386                 }
 387                 if (rv < SS_SUCCESS) {
 388                         rv = _drbd_request_state(mdev, mask, val,
 389                                                 CS_VERBOSE + CS_WAIT_COMPLETE);
 390                         if (rv < SS_SUCCESS)
 391                                 goto fail;
 392                 }
 393                 break;
 394         }
 395
 396         if (rv < SS_SUCCESS)
 397                 goto fail;
 398
 399         if (forced)
 400                 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
 401
 402         /* Wait until nothing is on the fly :) */
 403         wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
 404
 405         if (new_role == R_SECONDARY) {
 406                 set_disk_ro(mdev->vdisk, true);
 407                 if (get_ldev(mdev)) {
 408                         mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
 409                         put_ldev(mdev);
 410                 }
 411         } else {
 412                 if (get_net_conf(mdev)) {
 413                         mdev->net_conf->want_lose = 0;
 414                         put_net_conf(mdev);
 415                 }
 416                 set_disk_ro(mdev->vdisk, false);
 417                 if (get_ldev(mdev)) {
 418                         if (((mdev->state.conn < C_CONNECTED ||
 419                                mdev->state.pdsk <= D_FAILED)
 420                               && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
 421                                 drbd_uuid_new_current(mdev);
 422
 423                         mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
 424                         put_ldev(mdev);
 425                 }
 426         }
 427
 428         /* writeout of activity log covered areas of the bitmap
 429          * to stable storage done in after state change already */
 430
 431         if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
 432                 /* if this was forced, we should consider sync */
 433                 if (forced)
 434                         drbd_send_uuids(mdev);
 435                 drbd_send_current_state(mdev);
 436         }
 437
 438         drbd_md_sync(mdev);
 439
 440         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
 441  fail:
 442         mutex_unlock(&mdev->state_mutex);
 443         return rv;
 444 }
 445
 446 static struct drbd_conf *ensure_mdev(int minor, int create)
 447 {
 448         struct drbd_conf *mdev;
 449
 450         if (minor >= minor_count)
 451                 return NULL;
 452
 453         mdev = minor_to_mdev(minor);
 454
 455         if (!mdev && create) {
 456                 struct gendisk *disk = NULL;
 457                 mdev = drbd_new_device(minor);
 458
 459                 spin_lock_irq(&drbd_pp_lock);
 460                 if (minor_table[minor] == NULL) {
 461                         minor_table[minor] = mdev;
 462                         disk = mdev->vdisk;
 463                         mdev = NULL;
 464                 } /* else: we lost the race */
 465                 spin_unlock_irq(&drbd_pp_lock);
 466
 467                 if (disk) /* we won the race above */
 468                         /* in case we ever add a drbd_delete_device(),
 469                          * don't forget the del_gendisk! */
 470                         add_disk(disk);
 471                 else /* we lost the race above */
 472                         drbd_free_mdev(mdev);
 473
 474                 mdev = minor_to_mdev(minor);
 475         }
 476
 477         return mdev;
 478 }
 479
 480 static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
 481                            struct drbd_nl_cfg_reply *reply)
 482 {
 483         struct primary primary_args;
 484
 485         memset(&primary_args, 0, sizeof(struct primary));
 486         if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
 487                 reply->ret_code = ERR_MANDATORY_TAG;
 488                 return 0;
 489         }
 490
 491         reply->ret_code =
 492                 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force);
 493
 494         return 0;
 495 }
 496
 497 static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
 498                              struct drbd_nl_cfg_reply *reply)
 499 {
 500         reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
 501
 502         return 0;
 503 }
 504
 505 /* initializes the md.*_offset members, so we are able to find
 506  * the on disk meta data */
 507 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
 508                                        struct drbd_backing_dev *bdev)
 509 {
 510         sector_t md_size_sect = 0;
 511         switch (bdev->dc.meta_dev_idx) {
 512         default:
 513                 /* v07 style fixed size indexed meta data */
 514                 bdev->md.md_size_sect = MD_RESERVED_SECT;
 515                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 516                 bdev->md.al_offset = MD_AL_OFFSET;
 517                 bdev->md.bm_offset = MD_BM_OFFSET;
 518                 break;
 519         case DRBD_MD_INDEX_FLEX_EXT:
 520                 /* just occupy the full device; unit: sectors */
 521                 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
 522                 bdev->md.md_offset = 0;
 523                 bdev->md.al_offset = MD_AL_OFFSET;
 524                 bdev->md.bm_offset = MD_BM_OFFSET;
 525                 break;
 526         case DRBD_MD_INDEX_INTERNAL:
 527         case DRBD_MD_INDEX_FLEX_INT:
 528                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 529                 /* al size is still fixed */
 530                 bdev->md.al_offset = -MD_AL_MAX_SIZE;
 531                 /* we need (slightly less than) ~ this much bitmap sectors: */
 532                 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
 533                 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
 534                 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
 535                 md_size_sect = ALIGN(md_size_sect, 8);
 536
 537                 /* plus the "drbd meta data super block",
 538                  * and the activity log; */
 539                 md_size_sect += MD_BM_OFFSET;
 540
 541                 bdev->md.md_size_sect = md_size_sect;
 542                 /* bitmap offset is adjusted by 'super' block size */
 543                 bdev->md.bm_offset   = -md_size_sect + MD_AL_OFFSET;
 544                 break;
 545         }
 546 }
 547
 548 /* input size is expected to be in KB */
 549 char *ppsize(char *buf, unsigned long long size)
 550 {
 551         /* Needs 9 bytes at max including trailing NUL:
 552          * -1ULL ==> "16384 EB" */
 553         static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
 554         int base = 0;
 555         while (size >= 10000 && base < sizeof(units)-1) {
 556                 /* shift + round */
 557                 size = (size >> 10) + !!(size & (1<<9));
 558                 base++;
 559         }
 560         sprintf(buf, "%u %cB", (unsigned)size, units[base]);
 561
 562         return buf;
 563 }
 564
 565 /* there is still a theoretical deadlock when called from receiver
 566  * on an D_INCONSISTENT R_PRIMARY:
 567  *  remote READ does inc_ap_bio, receiver would need to receive answer
 568  *  packet from remote to dec_ap_bio again.
 569  *  receiver receive_sizes(), comes here,
 570  *  waits for ap_bio_cnt == 0. -> deadlock.
 571  * but this cannot happen, actually, because:
 572  *  R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
 573  *  (not connected, or bad/no disk on peer):
 574  *  see drbd_fail_request_early, ap_bio_cnt is zero.
 575  *  R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
 576  *  peer may not initiate a resize.
 577  */
 578 void drbd_suspend_io(struct drbd_conf *mdev)
 579 {
 580         set_bit(SUSPEND_IO, &mdev->flags);
 581         if (is_susp(mdev->state))
 582                 return;
 583         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
 584 }
 585
 586 void drbd_resume_io(struct drbd_conf *mdev)
 587 {
 588         clear_bit(SUSPEND_IO, &mdev->flags);
 589         wake_up(&mdev->misc_wait);
 590 }
 591
 592 /**
 593  * drbd_determine_dev_size() -  Sets the right device size obeying all constraints
 594  * @mdev:       DRBD device.
 595  *
 596  * Returns 0 on success, negative return values indicate errors.
 597  * You should call drbd_md_sync() after calling this function.
 598  */
 599 enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
 600 {
 601         sector_t prev_first_sect, prev_size; /* previous meta location */
 602         sector_t la_size;
 603         sector_t size;
 604         char ppb[10];
 605
 606         int md_moved, la_size_changed;
 607         enum determine_dev_size rv = unchanged;
 608
 609         /* race:
 610          * application request passes inc_ap_bio,
 611          * but then cannot get an AL-reference.
 612          * this function later may wait on ap_bio_cnt == 0. -> deadlock.
 613          *
 614          * to avoid that:
 615          * Suspend IO right here.
 616          * still lock the act_log to not trigger ASSERTs there.
 617          */
 618         drbd_suspend_io(mdev);
 619
 620         /* no wait necessary anymore, actually we could assert that */
 621         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
 622
 623         prev_first_sect = drbd_md_first_sector(mdev->ldev);
 624         prev_size = mdev->ldev->md.md_size_sect;
 625         la_size = mdev->ldev->md.la_size_sect;
 626
 627         /* TODO: should only be some assert here, not (re)init... */
 628         drbd_md_set_sector_offsets(mdev, mdev->ldev);
 629
 630         size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED);
 631
 632         if (drbd_get_capacity(mdev->this_bdev) != size ||
 633             drbd_bm_capacity(mdev) != size) {
 634                 int err;
 635                 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
 636                 if (unlikely(err)) {
 637                         /* currently there is only one error: ENOMEM! */
 638                         size = drbd_bm_capacity(mdev)>>1;
 639                         if (size == 0) {
 640                                 dev_err(DEV, "OUT OF MEMORY! "
 641                                     "Could not allocate bitmap!\n");
 642                         } else {
 643                                 dev_err(DEV, "BM resizing failed. "
 644                                     "Leaving size unchanged at size = %lu KB\n",
 645                                     (unsigned long)size);
 646                         }
 647                         rv = dev_size_error;
 648                 }
 649                 /* racy, see comments above. */
 650                 drbd_set_my_capacity(mdev, size);
 651                 mdev->ldev->md.la_size_sect = size;
 652                 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
 653                      (unsigned long long)size>>1);
 654         }
 655         if (rv == dev_size_error)
 656                 goto out;
 657
 658         la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
 659
 660         md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
 661                 || prev_size       != mdev->ldev->md.md_size_sect;
 662
 663         if (la_size_changed || md_moved) {
 664                 int err;
 665
 666                 drbd_al_shrink(mdev); /* All extents inactive. */
 667                 dev_info(DEV, "Writing the whole bitmap, %s\n",
 668                          la_size_changed && md_moved ? "size changed and md moved" :
 669                          la_size_changed ? "size changed" : "md moved");
 670                 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
 671                 err = drbd_bitmap_io(mdev, &drbd_bm_write,
 672                                 "size changed", BM_LOCKED_MASK);
 673                 if (err) {
 674                         rv = dev_size_error;
 675                         goto out;
 676                 }
 677                 drbd_md_mark_dirty(mdev);
 678         }
 679
 680         if (size > la_size)
 681                 rv = grew;
 682         if (size < la_size)
 683                 rv = shrunk;
 684 out:
 685         lc_unlock(mdev->act_log);
 686         wake_up(&mdev->al_wait);
 687         drbd_resume_io(mdev);
 688
 689         return rv;
 690 }
 691
 692 sector_t
 693 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
 694 {
 695         sector_t p_size = mdev->p_size;   /* partner's disk size. */
 696         sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
 697         sector_t m_size; /* my size */
 698         sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
 699         sector_t size = 0;
 700
 701         m_size = drbd_get_max_capacity(bdev);
 702
 703         if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
 704                 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
 705                 p_size = m_size;
 706         }
 707
 708         if (p_size && m_size) {
 709                 size = min_t(sector_t, p_size, m_size);
 710         } else {
 711                 if (la_size) {
 712                         size = la_size;
 713                         if (m_size && m_size < size)
 714                                 size = m_size;
 715                         if (p_size && p_size < size)
 716                                 size = p_size;
 717                 } else {
 718                         if (m_size)
 719                                 size = m_size;
 720                         if (p_size)
 721                                 size = p_size;
 722                 }
 723         }
 724
 725         if (size == 0)
 726                 dev_err(DEV, "Both nodes diskless!\n");
 727
 728         if (u_size) {
 729                 if (u_size > size)
 730                         dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
 731                             (unsigned long)u_size>>1, (unsigned long)size>>1);
 732                 else
 733                         size = u_size;
 734         }
 735
 736         return size;
 737 }
 738
 739 /**
 740  * drbd_check_al_size() - Ensures that the AL is of the right size
 741  * @mdev:       DRBD device.
 742  *
 743  * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
 744  * failed, and 0 on success. You should call drbd_md_sync() after you called
 745  * this function.
 746  */
 747 static int drbd_check_al_size(struct drbd_conf *mdev)
 748 {
 749         struct lru_cache *n, *t;
 750         struct lc_element *e;
 751         unsigned int in_use;
 752         int i;
 753
 754         ERR_IF(mdev->sync_conf.al_extents < 7)
 755                 mdev->sync_conf.al_extents = 127;
 756
 757         if (mdev->act_log &&
 758             mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
 759                 return 0;
 760
 761         in_use = 0;
 762         t = mdev->act_log;
 763         n = lc_create("act_log", drbd_al_ext_cache,
 764                 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
 765
 766         if (n == NULL) {
 767                 dev_err(DEV, "Cannot allocate act_log lru!\n");
 768                 return -ENOMEM;
 769         }
 770         spin_lock_irq(&mdev->al_lock);
 771         if (t) {
 772                 for (i = 0; i < t->nr_elements; i++) {
 773                         e = lc_element_by_index(t, i);
 774                         if (e->refcnt)
 775                                 dev_err(DEV, "refcnt(%d)==%d\n",
 776                                     e->lc_number, e->refcnt);
 777                         in_use += e->refcnt;
 778                 }
 779         }
 780         if (!in_use)
 781                 mdev->act_log = n;
 782         spin_unlock_irq(&mdev->al_lock);
 783         if (in_use) {
 784                 dev_err(DEV, "Activity log still in use!\n");
 785                 lc_destroy(n);
 786                 return -EBUSY;
 787         } else {
 788                 if (t)
 789                         lc_destroy(t);
 790         }
 791         drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
 792         return 0;
 793 }
 794
 795 static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
 796 {
 797         struct request_queue * const q = mdev->rq_queue;
 798         int max_hw_sectors = max_bio_size >> 9;
 799         int max_segments = 0;
 800
 801         if (get_ldev_if_state(mdev, D_ATTACHING)) {
 802                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
 803
 804                 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
 805                 max_segments = mdev->ldev->dc.max_bio_bvecs;
 806                 put_ldev(mdev);
 807         }
 808
 809         blk_queue_logical_block_size(q, 512);
 810         blk_queue_max_hw_sectors(q, max_hw_sectors);
 811         /* This is the workaround for "bio would need to, but cannot, be split" */
 812         blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
 813         blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
 814
 815         if (get_ldev_if_state(mdev, D_ATTACHING)) {
 816                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
 817
 818                 blk_queue_stack_limits(q, b);
 819
 820                 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
 821                         dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
 822                                  q->backing_dev_info.ra_pages,
 823                                  b->backing_dev_info.ra_pages);
 824                         q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
 825                 }
 826                 put_ldev(mdev);
 827         }
 828 }
 829
 830 void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
 831 {
 832         int now, new, local, peer;
 833
 834         now = queue_max_hw_sectors(mdev->rq_queue) << 9;
 835         local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
 836         peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
 837
 838         if (get_ldev_if_state(mdev, D_ATTACHING)) {
 839                 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
 840                 mdev->local_max_bio_size = local;
 841                 put_ldev(mdev);
 842         }
 843
 844         /* We may ignore peer limits if the peer is modern enough.
 845            Because new from 8.3.8 onwards the peer can use multiple
 846            BIOs for a single peer_request */
 847         if (mdev->state.conn >= C_CONNECTED) {
 848                 if (mdev->agreed_pro_version < 94) {
 849                         peer = min_t(int, mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
 850                         /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
 851                 } else if (mdev->agreed_pro_version == 94)
 852                         peer = DRBD_MAX_SIZE_H80_PACKET;
 853                 else /* drbd 8.3.8 onwards */
 854                         peer = DRBD_MAX_BIO_SIZE;
 855         }
 856
 857         new = min_t(int, local, peer);
 858
 859         if (mdev->state.role == R_PRIMARY && new < now)
 860                 dev_err(DEV, "ASSERT FAILED new < now; (%d < %d)\n", new, now);
 861
 862         if (new != now)
 863                 dev_info(DEV, "max BIO size = %u\n", new);
 864
 865         drbd_setup_queue_param(mdev, new);
 866 }
 867
 868 /* serialize deconfig (worker exiting, doing cleanup)
 869  * and reconfig (drbdsetup disk, drbdsetup net)
 870  *
 871  * Wait for a potentially exiting worker, then restart it,
 872  * or start a new one.  Flush any pending work, there may still be an
 873  * after_state_change queued.
 874  */
 875 static void drbd_reconfig_start(struct drbd_conf *mdev)
 876 {
 877         wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
 878         wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
 879         drbd_thread_start(&mdev->worker);
 880         drbd_flush_workqueue(mdev);
 881 }
 882
 883 /* if still unconfigured, stops worker again.
 884  * if configured now, clears CONFIG_PENDING.
 885  * wakes potential waiters */
 886 static void drbd_reconfig_done(struct drbd_conf *mdev)
 887 {
 888         spin_lock_irq(&mdev->req_lock);
 889         if (mdev->state.disk == D_DISKLESS &&
 890             mdev->state.conn == C_STANDALONE &&
 891             mdev->state.role == R_SECONDARY) {
 892                 set_bit(DEVICE_DYING, &mdev->flags);
 893                 drbd_thread_stop_nowait(&mdev->worker);
 894         } else
 895                 clear_bit(CONFIG_PENDING, &mdev->flags);
 896         spin_unlock_irq(&mdev->req_lock);
 897         wake_up(&mdev->state_wait);
 898 }
 899
 900 /* Make sure IO is suspended before calling this function(). */
 901 static void drbd_suspend_al(struct drbd_conf *mdev)
 902 {
 903         int s = 0;
 904
 905         if (lc_try_lock(mdev->act_log)) {
 906                 drbd_al_shrink(mdev);
 907                 lc_unlock(mdev->act_log);
 908         } else {
 909                 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
 910                 return;
 911         }
 912
 913         spin_lock_irq(&mdev->req_lock);
 914         if (mdev->state.conn < C_CONNECTED)
 915                 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
 916
 917         spin_unlock_irq(&mdev->req_lock);
 918
 919         if (s)
 920                 dev_info(DEV, "Suspended AL updates\n");
 921 }
 922
 923 /* does always return 0;
 924  * interesting return code is in reply->ret_code */
 925 static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
 926                              struct drbd_nl_cfg_reply *reply)
 927 {
 928         enum drbd_ret_code retcode;
 929         enum determine_dev_size dd;
 930         sector_t max_possible_sectors;
 931         sector_t min_md_device_sectors;
 932         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
 933         struct block_device *bdev;
 934         struct lru_cache *resync_lru = NULL;
 935         union drbd_state ns, os;
 936         enum drbd_state_rv rv;
 937         int cp_discovered = 0;
 938         int logical_block_size;
 939
 940         drbd_reconfig_start(mdev);
 941
 942         /* if you want to reconfigure, please tear down first */
 943         if (mdev->state.disk > D_DISKLESS) {
 944                 retcode = ERR_DISK_CONFIGURED;
 945                 goto fail;
 946         }
 947         /* It may just now have detached because of IO error.  Make sure
 948          * drbd_ldev_destroy is done already, we may end up here very fast,
 949          * e.g. if someone calls attach from the on-io-error handler,
 950          * to realize a "hot spare" feature (not that I'd recommend that) */
 951         wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
 952
 953         /* allocation not in the IO path, cqueue thread context */
 954         nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
 955         if (!nbc) {
 956                 retcode = ERR_NOMEM;
 957                 goto fail;
 958         }
 959
 960         nbc->dc.disk_size     = DRBD_DISK_SIZE_SECT_DEF;
 961         nbc->dc.on_io_error   = DRBD_ON_IO_ERROR_DEF;
 962         nbc->dc.fencing       = DRBD_FENCING_DEF;
 963         nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
 964
 965         if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
 966                 retcode = ERR_MANDATORY_TAG;
 967                 goto fail;
 968         }
 969
 970         if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
 971                 retcode = ERR_MD_IDX_INVALID;
 972                 goto fail;
 973         }
 974
 975         if (get_net_conf(mdev)) {
 976                 int prot = mdev->net_conf->wire_protocol;
 977                 put_net_conf(mdev);
 978                 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) {
 979                         retcode = ERR_STONITH_AND_PROT_A;
 980                         goto fail;
 981                 }
 982         }
 983
 984         bdev = blkdev_get_by_path(nbc->dc.backing_dev,
 985                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
 986         if (IS_ERR(bdev)) {
 987                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
 988                         PTR_ERR(bdev));
 989                 retcode = ERR_OPEN_DISK;
 990                 goto fail;
 991         }
 992         nbc->backing_bdev = bdev;
 993
 994         /*
 995          * meta_dev_idx >= 0: external fixed size, possibly multiple
 996          * drbd sharing one meta device.  TODO in that case, paranoia
 997          * check that [md_bdev, meta_dev_idx] is not yet used by some
 998          * other drbd minor!  (if you use drbd.conf + drbdadm, that
 999          * should check it for you already; but if you don't, or
1000          * someone fooled it, we need to double check here)
1001          */
1002         bdev = blkdev_get_by_path(nbc->dc.meta_dev,
1003                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1004                                   (nbc->dc.meta_dev_idx < 0) ?
1005                                   (void *)mdev : (void *)drbd_m_holder);
1006         if (IS_ERR(bdev)) {
1007                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
1008                         PTR_ERR(bdev));
1009                 retcode = ERR_OPEN_MD_DISK;
1010                 goto fail;
1011         }
1012         nbc->md_bdev = bdev;
1013
1014         if ((nbc->backing_bdev == nbc->md_bdev) !=
1015             (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1016              nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1017                 retcode = ERR_MD_IDX_INVALID;
1018                 goto fail;
1019         }
1020
1021         resync_lru = lc_create("resync", drbd_bm_ext_cache,
1022                         61, sizeof(struct bm_extent),
1023                         offsetof(struct bm_extent, lce));
1024         if (!resync_lru) {
1025                 retcode = ERR_NOMEM;
1026                 goto fail;
1027         }
1028
1029         /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1030         drbd_md_set_sector_offsets(mdev, nbc);
1031
1032         if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
1033                 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1034                         (unsigned long long) drbd_get_max_capacity(nbc),
1035                         (unsigned long long) nbc->dc.disk_size);
1036                 retcode = ERR_DISK_TOO_SMALL;
1037                 goto fail;
1038         }
1039
1040         if (nbc->dc.meta_dev_idx < 0) {
1041                 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1042                 /* at least one MB, otherwise it does not make sense */
1043                 min_md_device_sectors = (2<<10);
1044         } else {
1045                 max_possible_sectors = DRBD_MAX_SECTORS;
1046                 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
1047         }
1048
1049         if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1050                 retcode = ERR_MD_DISK_TOO_SMALL;
1051                 dev_warn(DEV, "refusing attach: md-device too small, "
1052                      "at least %llu sectors needed for this meta-disk type\n",
1053                      (unsigned long long) min_md_device_sectors);
1054                 goto fail;
1055         }
1056
1057         /* Make sure the new disk is big enough
1058          * (we may currently be R_PRIMARY with no local disk...) */
1059         if (drbd_get_max_capacity(nbc) <
1060             drbd_get_capacity(mdev->this_bdev)) {
1061                 retcode = ERR_DISK_TOO_SMALL;
1062                 goto fail;
1063         }
1064
1065         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1066
1067         if (nbc->known_size > max_possible_sectors) {
1068                 dev_warn(DEV, "==> truncating very big lower level device "
1069                         "to currently maximum possible %llu sectors <==\n",
1070                         (unsigned long long) max_possible_sectors);
1071                 if (nbc->dc.meta_dev_idx >= 0)
1072                         dev_warn(DEV, "==>> using internal or flexible "
1073                                       "meta data may help <<==\n");
1074         }
1075
1076         drbd_suspend_io(mdev);
1077         /* also wait for the last barrier ack. */
1078         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state));
1079         /* and for any other previously queued work */
1080         drbd_flush_workqueue(mdev);
1081
1082         rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1083         retcode = rv;  /* FIXME: Type mismatch. */
1084         drbd_resume_io(mdev);
1085         if (rv < SS_SUCCESS)
1086                 goto fail;
1087
1088         if (!get_ldev_if_state(mdev, D_ATTACHING))
1089                 goto force_diskless;
1090
1091         drbd_md_set_sector_offsets(mdev, nbc);
1092
1093         /* allocate a second IO page if logical_block_size != 512 */
1094         logical_block_size = bdev_logical_block_size(nbc->md_bdev);
1095         if (logical_block_size == 0)
1096                 logical_block_size = MD_SECTOR_SIZE;
1097
1098         if (logical_block_size != MD_SECTOR_SIZE) {
1099                 if (!mdev->md_io_tmpp) {
1100                         struct page *page = alloc_page(GFP_NOIO);
1101                         if (!page)
1102                                 goto force_diskless_dec;
1103
1104                         dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
1105                              logical_block_size, MD_SECTOR_SIZE);
1106                         dev_warn(DEV, "Workaround engaged (has performance impact).\n");
1107
1108                         mdev->md_io_tmpp = page;
1109                 }
1110         }
1111
1112         if (!mdev->bitmap) {
1113                 if (drbd_bm_init(mdev)) {
1114                         retcode = ERR_NOMEM;
1115                         goto force_diskless_dec;
1116                 }
1117         }
1118
1119         retcode = drbd_md_read(mdev, nbc);
1120         if (retcode != NO_ERROR)
1121                 goto force_diskless_dec;
1122
1123         if (mdev->state.conn < C_CONNECTED &&
1124             mdev->state.role == R_PRIMARY &&
1125             (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1126                 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1127                     (unsigned long long)mdev->ed_uuid);
1128                 retcode = ERR_DATA_NOT_CURRENT;
1129                 goto force_diskless_dec;
1130         }
1131
1132         /* Since we are diskless, fix the activity log first... */
1133         if (drbd_check_al_size(mdev)) {
1134                 retcode = ERR_NOMEM;
1135                 goto force_diskless_dec;
1136         }
1137
1138         /* Prevent shrinking of consistent devices ! */
1139         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1140             drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
1141                 dev_warn(DEV, "refusing to truncate a consistent device\n");
1142                 retcode = ERR_DISK_TOO_SMALL;
1143                 goto force_diskless_dec;
1144         }
1145
1146         if (!drbd_al_read_log(mdev, nbc)) {
1147                 retcode = ERR_IO_MD_DISK;
1148                 goto force_diskless_dec;
1149         }
1150
1151         /* Reset the "barriers don't work" bits here, then force meta data to
1152          * be written, to ensure we determine if barriers are supported. */
1153         if (nbc->dc.no_md_flush)
1154                 set_bit(MD_NO_FUA, &mdev->flags);
1155         else
1156                 clear_bit(MD_NO_FUA, &mdev->flags);
1157
1158         /* Point of no return reached.
1159          * Devices and memory are no longer released by error cleanup below.
1160          * now mdev takes over responsibility, and the state engine should
1161          * clean it up somewhere.  */
1162         D_ASSERT(mdev->ldev == NULL);
1163         mdev->ldev = nbc;
1164         mdev->resync = resync_lru;
1165         nbc = NULL;
1166         resync_lru = NULL;
1167
1168         mdev->write_ordering = WO_bdev_flush;
1169         drbd_bump_write_ordering(mdev, WO_bdev_flush);
1170
1171         if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1172                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1173         else
1174                 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1175
1176         if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1177             !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) {
1178                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1179                 cp_discovered = 1;
1180         }
1181
1182         mdev->send_cnt = 0;
1183         mdev->recv_cnt = 0;
1184         mdev->read_cnt = 0;
1185         mdev->writ_cnt = 0;
1186
1187         drbd_reconsider_max_bio_size(mdev);
1188
1189         /* If I am currently not R_PRIMARY,
1190          * but meta data primary indicator is set,
1191          * I just now recover from a hard crash,
1192          * and have been R_PRIMARY before that crash.
1193          *
1194          * Now, if I had no connection before that crash
1195          * (have been degraded R_PRIMARY), chances are that
1196          * I won't find my peer now either.
1197          *
1198          * In that case, and _only_ in that case,
1199          * we use the degr-wfc-timeout instead of the default,
1200          * so we can automatically recover from a crash of a
1201          * degraded but active "cluster" after a certain timeout.
1202          */
1203         clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1204         if (mdev->state.role != R_PRIMARY &&
1205              drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1206             !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1207                 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1208
1209         dd = drbd_determine_dev_size(mdev, 0);
1210         if (dd == dev_size_error) {
1211                 retcode = ERR_NOMEM_BITMAP;
1212                 goto force_diskless_dec;
1213         } else if (dd == grew)
1214                 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1215
1216         if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1217                 dev_info(DEV, "Assuming that all blocks are out of sync "
1218                      "(aka FullSync)\n");
1219                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1220                         "set_n_write from attaching", BM_LOCKED_MASK)) {
1221                         retcode = ERR_IO_MD_DISK;
1222                         goto force_diskless_dec;
1223                 }
1224         } else {
1225                 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1226                         "read from attaching", BM_LOCKED_MASK) < 0) {
1227                         retcode = ERR_IO_MD_DISK;
1228                         goto force_diskless_dec;
1229                 }
1230         }
1231
1232         if (cp_discovered) {
1233                 drbd_al_apply_to_bm(mdev);
1234                 if (drbd_bitmap_io(mdev, &drbd_bm_write,
1235                         "crashed primary apply AL", BM_LOCKED_MASK)) {
1236                         retcode = ERR_IO_MD_DISK;
1237                         goto force_diskless_dec;
1238                 }
1239         }
1240
1241         if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1242                 drbd_suspend_al(mdev); /* IO is still suspended here... */
1243
1244         spin_lock_irq(&mdev->req_lock);
1245         os = mdev->state;
1246         ns.i = os.i;
1247         /* If MDF_CONSISTENT is not set go into inconsistent state,
1248            otherwise investigate MDF_WasUpToDate...
1249            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1250            otherwise into D_CONSISTENT state.
1251         */
1252         if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1253                 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1254                         ns.disk = D_CONSISTENT;
1255                 else
1256                         ns.disk = D_OUTDATED;
1257         } else {
1258                 ns.disk = D_INCONSISTENT;
1259         }
1260
1261         if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1262                 ns.pdsk = D_OUTDATED;
1263
1264         if ( ns.disk == D_CONSISTENT &&
1265             (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1266                 ns.disk = D_UP_TO_DATE;
1267
1268         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1269            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1270            this point, because drbd_request_state() modifies these
1271            flags. */
1272
1273         /* In case we are C_CONNECTED postpone any decision on the new disk
1274            state after the negotiation phase. */
1275         if (mdev->state.conn == C_CONNECTED) {
1276                 mdev->new_state_tmp.i = ns.i;
1277                 ns.i = os.i;
1278                 ns.disk = D_NEGOTIATING;
1279
1280                 /* We expect to receive up-to-date UUIDs soon.
1281                    To avoid a race in receive_state, free p_uuid while
1282                    holding req_lock. I.e. atomic with the state change */
1283                 kfree(mdev->p_uuid);
1284                 mdev->p_uuid = NULL;
1285         }
1286
1287         rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1288         ns = mdev->state;
1289         spin_unlock_irq(&mdev->req_lock);
1290
1291         if (rv < SS_SUCCESS)
1292                 goto force_diskless_dec;
1293
1294         if (mdev->state.role == R_PRIMARY)
1295                 mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1296         else
1297                 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1298
1299         drbd_md_mark_dirty(mdev);
1300         drbd_md_sync(mdev);
1301
1302         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1303         put_ldev(mdev);
1304         reply->ret_code = retcode;
1305         drbd_reconfig_done(mdev);
1306         return 0;
1307
1308  force_diskless_dec:
1309         put_ldev(mdev);
1310  force_diskless:
1311         drbd_force_state(mdev, NS(disk, D_FAILED));
1312         drbd_md_sync(mdev);
1313  fail:
1314         if (nbc) {
1315                 if (nbc->backing_bdev)
1316                         blkdev_put(nbc->backing_bdev,
1317                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1318                 if (nbc->md_bdev)
1319                         blkdev_put(nbc->md_bdev,
1320                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1321                 kfree(nbc);
1322         }
1323         lc_destroy(resync_lru);
1324
1325         reply->ret_code = retcode;
1326         drbd_reconfig_done(mdev);
1327         return 0;
1328 }
1329
1330 /* Detaching the disk is a process in multiple stages.  First we need to lock
1331  * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1332  * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1333  * internal references as well.
1334  * Only then we have finally detached. */
1335 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1336                           struct drbd_nl_cfg_reply *reply)
1337 {
1338         enum drbd_ret_code retcode;
1339         int ret;
1340         struct detach dt = {};
1341
1342         if (!detach_from_tags(mdev, nlp->tag_list, &dt)) {
1343                 reply->ret_code = ERR_MANDATORY_TAG;
1344                 goto out;
1345         }
1346
1347         if (dt.detach_force) {
1348                 drbd_force_state(mdev, NS(disk, D_FAILED));
1349                 reply->ret_code = SS_SUCCESS;
1350                 goto out;
1351         }
1352
1353         drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1354         drbd_md_get_buffer(mdev); /* make sure there is no in-flight meta-data IO */
1355         retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1356         drbd_md_put_buffer(mdev);
1357         /* D_FAILED will transition to DISKLESS. */
1358         ret = wait_event_interruptible(mdev->misc_wait,
1359                         mdev->state.disk != D_FAILED);
1360         drbd_resume_io(mdev);
1361
1362         if ((int)retcode == (int)SS_IS_DISKLESS)
1363                 retcode = SS_NOTHING_TO_DO;
1364         if (ret)
1365                 retcode = ERR_INTR;
1366         reply->ret_code = retcode;
1367 out:
1368         return 0;
1369 }
1370
1371 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1372                             struct drbd_nl_cfg_reply *reply)
1373 {
1374         int i, ns;
1375         enum drbd_ret_code retcode;
1376         struct net_conf *new_conf = NULL;
1377         struct crypto_hash *tfm = NULL;
1378         struct crypto_hash *integrity_w_tfm = NULL;
1379         struct crypto_hash *integrity_r_tfm = NULL;
1380         struct hlist_head *new_tl_hash = NULL;
1381         struct hlist_head *new_ee_hash = NULL;
1382         struct drbd_conf *odev;
1383         char hmac_name[CRYPTO_MAX_ALG_NAME];
1384         void *int_dig_out = NULL;
1385         void *int_dig_in = NULL;
1386         void *int_dig_vv = NULL;
1387         struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1388
1389         drbd_reconfig_start(mdev);
1390
1391         if (mdev->state.conn > C_STANDALONE) {
1392                 retcode = ERR_NET_CONFIGURED;
1393                 goto fail;
1394         }
1395
1396         /* allocation not in the IO path, cqueue thread context */
1397         new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1398         if (!new_conf) {
1399                 retcode = ERR_NOMEM;
1400                 goto fail;
1401         }
1402
1403         new_conf->timeout          = DRBD_TIMEOUT_DEF;
1404         new_conf->try_connect_int  = DRBD_CONNECT_INT_DEF;
1405         new_conf->ping_int         = DRBD_PING_INT_DEF;
1406         new_conf->max_epoch_size   = DRBD_MAX_EPOCH_SIZE_DEF;
1407         new_conf->max_buffers      = DRBD_MAX_BUFFERS_DEF;
1408         new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1409         new_conf->sndbuf_size      = DRBD_SNDBUF_SIZE_DEF;
1410         new_conf->rcvbuf_size      = DRBD_RCVBUF_SIZE_DEF;
1411         new_conf->ko_count         = DRBD_KO_COUNT_DEF;
1412         new_conf->after_sb_0p      = DRBD_AFTER_SB_0P_DEF;
1413         new_conf->after_sb_1p      = DRBD_AFTER_SB_1P_DEF;
1414         new_conf->after_sb_2p      = DRBD_AFTER_SB_2P_DEF;
1415         new_conf->want_lose        = 0;
1416         new_conf->two_primaries    = 0;
1417         new_conf->wire_protocol    = DRBD_PROT_C;
1418         new_conf->ping_timeo       = DRBD_PING_TIMEO_DEF;
1419         new_conf->rr_conflict      = DRBD_RR_CONFLICT_DEF;
1420         new_conf->on_congestion    = DRBD_ON_CONGESTION_DEF;
1421         new_conf->cong_extents     = DRBD_CONG_EXTENTS_DEF;
1422
1423         if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1424                 retcode = ERR_MANDATORY_TAG;
1425                 goto fail;
1426         }
1427
1428         if (new_conf->two_primaries
1429             && (new_conf->wire_protocol != DRBD_PROT_C)) {
1430                 retcode = ERR_NOT_PROTO_C;
1431                 goto fail;
1432         }
1433
1434         if (get_ldev(mdev)) {
1435                 enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
1436                 put_ldev(mdev);
1437                 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) {
1438                         retcode = ERR_STONITH_AND_PROT_A;
1439                         goto fail;
1440                 }
1441         }
1442
1443         if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A) {
1444                 retcode = ERR_CONG_NOT_PROTO_A;
1445                 goto fail;
1446         }
1447
1448         if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1449                 retcode = ERR_DISCARD;
1450                 goto fail;
1451         }
1452
1453         retcode = NO_ERROR;
1454
1455         new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1456         new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1457         for (i = 0; i < minor_count; i++) {
1458                 odev = minor_to_mdev(i);
1459                 if (!odev || odev == mdev)
1460                         continue;
1461                 if (get_net_conf(odev)) {
1462                         taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1463                         if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1464                             !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1465                                 retcode = ERR_LOCAL_ADDR;
1466
1467                         taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1468                         if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1469                             !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1470                                 retcode = ERR_PEER_ADDR;
1471
1472                         put_net_conf(odev);
1473                         if (retcode != NO_ERROR)
1474                                 goto fail;
1475                 }
1476         }
1477
1478         if (new_conf->cram_hmac_alg[0] != 0) {
1479                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1480                         new_conf->cram_hmac_alg);
1481                 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1482                 if (IS_ERR(tfm)) {
1483                         tfm = NULL;
1484                         retcode = ERR_AUTH_ALG;
1485                         goto fail;
1486                 }
1487
1488                 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
1489                         retcode = ERR_AUTH_ALG_ND;
1490                         goto fail;
1491                 }
1492         }
1493
1494         if (new_conf->integrity_alg[0]) {
1495                 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1496                 if (IS_ERR(integrity_w_tfm)) {
1497                         integrity_w_tfm = NULL;
1498                         retcode=ERR_INTEGRITY_ALG;
1499                         goto fail;
1500                 }
1501
1502                 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1503                         retcode=ERR_INTEGRITY_ALG_ND;
1504                         goto fail;
1505                 }
1506
1507                 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1508                 if (IS_ERR(integrity_r_tfm)) {
1509                         integrity_r_tfm = NULL;
1510                         retcode=ERR_INTEGRITY_ALG;
1511                         goto fail;
1512                 }
1513         }
1514
1515         ns = new_conf->max_epoch_size/8;
1516         if (mdev->tl_hash_s != ns) {
1517                 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1518                 if (!new_tl_hash) {
1519                         retcode = ERR_NOMEM;
1520                         goto fail;
1521                 }
1522         }
1523
1524         ns = new_conf->max_buffers/8;
1525         if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1526                 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1527                 if (!new_ee_hash) {
1528                         retcode = ERR_NOMEM;
1529                         goto fail;
1530                 }
1531         }
1532
1533         ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1534
1535         if (integrity_w_tfm) {
1536                 i = crypto_hash_digestsize(integrity_w_tfm);
1537                 int_dig_out = kmalloc(i, GFP_KERNEL);
1538                 if (!int_dig_out) {
1539                         retcode = ERR_NOMEM;
1540                         goto fail;
1541                 }
1542                 int_dig_in = kmalloc(i, GFP_KERNEL);
1543                 if (!int_dig_in) {
1544                         retcode = ERR_NOMEM;
1545                         goto fail;
1546                 }
1547                 int_dig_vv = kmalloc(i, GFP_KERNEL);
1548                 if (!int_dig_vv) {
1549                         retcode = ERR_NOMEM;
1550                         goto fail;
1551                 }
1552         }
1553
1554         if (!mdev->bitmap) {
1555                 if(drbd_bm_init(mdev)) {
1556                         retcode = ERR_NOMEM;
1557                         goto fail;
1558                 }
1559         }
1560
1561         drbd_flush_workqueue(mdev);
1562         spin_lock_irq(&mdev->req_lock);
1563         if (mdev->net_conf != NULL) {
1564                 retcode = ERR_NET_CONFIGURED;
1565                 spin_unlock_irq(&mdev->req_lock);
1566                 goto fail;
1567         }
1568         mdev->net_conf = new_conf;
1569
1570         mdev->send_cnt = 0;
1571         mdev->recv_cnt = 0;
1572
1573         if (new_tl_hash) {
1574                 kfree(mdev->tl_hash);
1575                 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1576                 mdev->tl_hash = new_tl_hash;
1577         }
1578
1579         if (new_ee_hash) {
1580                 kfree(mdev->ee_hash);
1581                 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1582                 mdev->ee_hash = new_ee_hash;
1583         }
1584
1585         crypto_free_hash(mdev->cram_hmac_tfm);
1586         mdev->cram_hmac_tfm = tfm;
1587
1588         crypto_free_hash(mdev->integrity_w_tfm);
1589         mdev->integrity_w_tfm = integrity_w_tfm;
1590
1591         crypto_free_hash(mdev->integrity_r_tfm);
1592         mdev->integrity_r_tfm = integrity_r_tfm;
1593
1594         kfree(mdev->int_dig_out);
1595         kfree(mdev->int_dig_in);
1596         kfree(mdev->int_dig_vv);
1597         mdev->int_dig_out=int_dig_out;
1598         mdev->int_dig_in=int_dig_in;
1599         mdev->int_dig_vv=int_dig_vv;
1600         retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL);
1601         spin_unlock_irq(&mdev->req_lock);
1602
1603         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1604         reply->ret_code = retcode;
1605         drbd_reconfig_done(mdev);
1606         return 0;
1607
1608 fail:
1609         kfree(int_dig_out);
1610         kfree(int_dig_in);
1611         kfree(int_dig_vv);
1612         crypto_free_hash(tfm);
1613         crypto_free_hash(integrity_w_tfm);
1614         crypto_free_hash(integrity_r_tfm);
1615         kfree(new_tl_hash);
1616         kfree(new_ee_hash);
1617         kfree(new_conf);
1618
1619         reply->ret_code = retcode;
1620         drbd_reconfig_done(mdev);
1621         return 0;
1622 }
1623
1624 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1625                               struct drbd_nl_cfg_reply *reply)
1626 {
1627         int retcode;
1628         struct disconnect dc;
1629
1630         memset(&dc, 0, sizeof(struct disconnect));
1631         if (!disconnect_from_tags(mdev, nlp->tag_list, &dc)) {
1632                 retcode = ERR_MANDATORY_TAG;
1633                 goto fail;
1634         }
1635
1636         if (dc.force) {
1637                 spin_lock_irq(&mdev->req_lock);
1638                 if (mdev->state.conn >= C_WF_CONNECTION)
1639                         _drbd_set_state(_NS(mdev, conn, C_DISCONNECTING), CS_HARD, NULL);
1640                 spin_unlock_irq(&mdev->req_lock);
1641                 goto done;
1642         }
1643
1644         retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1645
1646         if (retcode == SS_NOTHING_TO_DO)
1647                 goto done;
1648         else if (retcode == SS_ALREADY_STANDALONE)
1649                 goto done;
1650         else if (retcode == SS_PRIMARY_NOP) {
1651                 /* Our statche checking code wants to see the peer outdated. */
1652                 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1653                                                       pdsk, D_OUTDATED));
1654         } else if (retcode == SS_CW_FAILED_BY_PEER) {
1655                 /* The peer probably wants to see us outdated. */
1656                 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1657                                                         disk, D_OUTDATED),
1658                                               CS_ORDERED);
1659                 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1660                         drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1661                         retcode = SS_SUCCESS;
1662                 }
1663         }
1664
1665         if (retcode < SS_SUCCESS)
1666                 goto fail;
1667
1668         if (wait_event_interruptible(mdev->state_wait,
1669                                      mdev->state.conn != C_DISCONNECTING)) {
1670                 /* Do not test for mdev->state.conn == C_STANDALONE, since
1671                    someone else might connect us in the mean time! */
1672                 retcode = ERR_INTR;
1673                 goto fail;
1674         }
1675
1676  done:
1677         retcode = NO_ERROR;
1678  fail:
1679         drbd_md_sync(mdev);
1680         reply->ret_code = retcode;
1681         return 0;
1682 }
1683
1684 void resync_after_online_grow(struct drbd_conf *mdev)
1685 {
1686         int iass; /* I am sync source */
1687
1688         dev_info(DEV, "Resync of new storage after online grow\n");
1689         if (mdev->state.role != mdev->state.peer)
1690                 iass = (mdev->state.role == R_PRIMARY);
1691         else
1692                 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1693
1694         if (iass)
1695                 drbd_start_resync(mdev, C_SYNC_SOURCE);
1696         else
1697                 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1698 }
1699
1700 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1701                           struct drbd_nl_cfg_reply *reply)
1702 {
1703         struct resize rs;
1704         int retcode = NO_ERROR;
1705         enum determine_dev_size dd;
1706         enum dds_flags ddsf;
1707
1708         memset(&rs, 0, sizeof(struct resize));
1709         if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1710                 retcode = ERR_MANDATORY_TAG;
1711                 goto fail;
1712         }
1713
1714         if (mdev->state.conn > C_CONNECTED) {
1715                 retcode = ERR_RESIZE_RESYNC;
1716                 goto fail;
1717         }
1718
1719         if (mdev->state.role == R_SECONDARY &&
1720             mdev->state.peer == R_SECONDARY) {
1721                 retcode = ERR_NO_PRIMARY;
1722                 goto fail;
1723         }
1724
1725         if (!get_ldev(mdev)) {
1726                 retcode = ERR_NO_DISK;
1727                 goto fail;
1728         }
1729
1730         if (rs.no_resync && mdev->agreed_pro_version < 93) {
1731                 retcode = ERR_NEED_APV_93;
1732                 goto fail_ldev;
1733         }
1734
1735         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
1736                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
1737
1738         mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
1739         ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
1740         dd = drbd_determine_dev_size(mdev, ddsf);
1741         drbd_md_sync(mdev);
1742         put_ldev(mdev);
1743         if (dd == dev_size_error) {
1744                 retcode = ERR_NOMEM_BITMAP;
1745                 goto fail;
1746         }
1747
1748         if (mdev->state.conn == C_CONNECTED) {
1749                 if (dd == grew)
1750                         set_bit(RESIZE_PENDING, &mdev->flags);
1751
1752                 drbd_send_uuids(mdev);
1753                 drbd_send_sizes(mdev, 1, ddsf);
1754         }
1755
1756  fail:
1757         reply->ret_code = retcode;
1758         return 0;
1759
1760  fail_ldev:
1761         put_ldev(mdev);
1762         goto fail;
1763 }
1764
1765 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1766                                struct drbd_nl_cfg_reply *reply)
1767 {
1768         int retcode = NO_ERROR;
1769         int err;
1770         int ovr; /* online verify running */
1771         int rsr; /* re-sync running */
1772         struct crypto_hash *verify_tfm = NULL;
1773         struct crypto_hash *csums_tfm = NULL;
1774         struct syncer_conf sc;
1775         cpumask_var_t new_cpu_mask;
1776         int *rs_plan_s = NULL;
1777         int fifo_size;
1778
1779         if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1780                 retcode = ERR_NOMEM;
1781                 goto fail;
1782         }
1783
1784         if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1785                 memset(&sc, 0, sizeof(struct syncer_conf));
1786                 sc.rate       = DRBD_RATE_DEF;
1787                 sc.after      = DRBD_AFTER_DEF;
1788                 sc.al_extents = DRBD_AL_EXTENTS_DEF;
1789                 sc.on_no_data  = DRBD_ON_NO_DATA_DEF;
1790                 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF;
1791                 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF;
1792                 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF;
1793                 sc.c_max_rate = DRBD_C_MAX_RATE_DEF;
1794                 sc.c_min_rate = DRBD_C_MIN_RATE_DEF;
1795         } else
1796                 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1797
1798         if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1799                 retcode = ERR_MANDATORY_TAG;
1800                 goto fail;
1801         }
1802
1803         /* re-sync running */
1804         rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1805                 mdev->state.conn == C_SYNC_TARGET ||
1806                 mdev->state.conn == C_PAUSED_SYNC_S ||
1807                 mdev->state.conn == C_PAUSED_SYNC_T );
1808
1809         if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1810                 retcode = ERR_CSUMS_RESYNC_RUNNING;
1811                 goto fail;
1812         }
1813
1814         if (!rsr && sc.csums_alg[0]) {
1815                 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1816                 if (IS_ERR(csums_tfm)) {
1817                         csums_tfm = NULL;
1818                         retcode = ERR_CSUMS_ALG;
1819                         goto fail;
1820                 }
1821
1822                 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1823                         retcode = ERR_CSUMS_ALG_ND;
1824                         goto fail;
1825                 }
1826         }
1827
1828         /* online verify running */
1829         ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1830
1831         if (ovr) {
1832                 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1833                         retcode = ERR_VERIFY_RUNNING;
1834                         goto fail;
1835                 }
1836         }
1837
1838         if (!ovr && sc.verify_alg[0]) {
1839                 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1840                 if (IS_ERR(verify_tfm)) {
1841                         verify_tfm = NULL;
1842                         retcode = ERR_VERIFY_ALG;
1843                         goto fail;
1844                 }
1845
1846                 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1847                         retcode = ERR_VERIFY_ALG_ND;
1848                         goto fail;
1849                 }
1850         }
1851
1852         /* silently ignore cpu mask on UP kernel */
1853         if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1854                 err = bitmap_parse(sc.cpu_mask, 32,
1855                                 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1856                 if (err) {
1857                         dev_warn(DEV, "bitmap_parse() failed with %d\n", err);
1858                         retcode = ERR_CPU_MASK_PARSE;
1859                         goto fail;
1860                 }
1861         }
1862
1863         ERR_IF (sc.rate < 1) sc.rate = 1;
1864         ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
1865 #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1866         if (sc.al_extents > AL_MAX) {
1867                 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1868                 sc.al_extents = AL_MAX;
1869         }
1870 #undef AL_MAX
1871
1872         /* to avoid spurious errors when configuring minors before configuring
1873          * the minors they depend on: if necessary, first create the minor we
1874          * depend on */
1875         if (sc.after >= 0)
1876                 ensure_mdev(sc.after, 1);
1877
1878         /* most sanity checks done, try to assign the new sync-after
1879          * dependency.  need to hold the global lock in there,
1880          * to avoid a race in the dependency loop check. */
1881         retcode = drbd_alter_sa(mdev, sc.after);
1882         if (retcode != NO_ERROR)
1883                 goto fail;
1884
1885         fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1886         if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
1887                 rs_plan_s   = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
1888                 if (!rs_plan_s) {
1889                         dev_err(DEV, "kmalloc of fifo_buffer failed");
1890                         retcode = ERR_NOMEM;
1891                         goto fail;
1892                 }
1893         }
1894
1895         /* ok, assign the rest of it as well.
1896          * lock against receive_SyncParam() */
1897         spin_lock(&mdev->peer_seq_lock);
1898         mdev->sync_conf = sc;
1899
1900         if (!rsr) {
1901                 crypto_free_hash(mdev->csums_tfm);
1902                 mdev->csums_tfm = csums_tfm;
1903                 csums_tfm = NULL;
1904         }
1905
1906         if (!ovr) {
1907                 crypto_free_hash(mdev->verify_tfm);
1908                 mdev->verify_tfm = verify_tfm;
1909                 verify_tfm = NULL;
1910         }
1911
1912         if (fifo_size != mdev->rs_plan_s.size) {
1913                 kfree(mdev->rs_plan_s.values);
1914                 mdev->rs_plan_s.values = rs_plan_s;
1915                 mdev->rs_plan_s.size   = fifo_size;
1916                 mdev->rs_planed = 0;
1917                 rs_plan_s = NULL;
1918         }
1919
1920         spin_unlock(&mdev->peer_seq_lock);
1921
1922         if (get_ldev(mdev)) {
1923                 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1924                 drbd_al_shrink(mdev);
1925                 err = drbd_check_al_size(mdev);
1926                 lc_unlock(mdev->act_log);
1927                 wake_up(&mdev->al_wait);
1928
1929                 put_ldev(mdev);
1930                 drbd_md_sync(mdev);
1931
1932                 if (err) {
1933                         retcode = ERR_NOMEM;
1934                         goto fail;
1935                 }
1936         }
1937
1938         if (mdev->state.conn >= C_CONNECTED)
1939                 drbd_send_sync_param(mdev, &sc);
1940
1941         if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
1942                 cpumask_copy(mdev->cpu_mask, new_cpu_mask);
1943                 drbd_calc_cpu_mask(mdev);
1944                 mdev->receiver.reset_cpu_mask = 1;
1945                 mdev->asender.reset_cpu_mask = 1;
1946                 mdev->worker.reset_cpu_mask = 1;
1947         }
1948
1949         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1950 fail:
1951         kfree(rs_plan_s);
1952         free_cpumask_var(new_cpu_mask);
1953         crypto_free_hash(csums_tfm);
1954         crypto_free_hash(verify_tfm);
1955         reply->ret_code = retcode;
1956         return 0;
1957 }
1958
1959 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1960                               struct drbd_nl_cfg_reply *reply)
1961 {
1962         int retcode;
1963
1964         /* If there is still bitmap IO pending, probably because of a previous
1965          * resync just being finished, wait for it before requesting a new resync. */
1966         drbd_suspend_io(mdev);
1967         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
1968
1969         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1970
1971         if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1972                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1973
1974         while (retcode == SS_NEED_CONNECTION) {
1975                 spin_lock_irq(&mdev->req_lock);
1976                 if (mdev->state.conn < C_CONNECTED)
1977                         retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1978                 spin_unlock_irq(&mdev->req_lock);
1979
1980                 if (retcode != SS_NEED_CONNECTION)
1981                         break;
1982
1983                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1984         }
1985         drbd_resume_io(mdev);
1986
1987         reply->ret_code = retcode;
1988         return 0;
1989 }
1990
1991 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
1992 {
1993         int rv;
1994
1995         rv = drbd_bmio_set_n_write(mdev);
1996         drbd_suspend_al(mdev);
1997         return rv;
1998 }
1999
2000 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2001                                    struct drbd_nl_cfg_reply *reply)
2002 {
2003         int retcode;
2004
2005         /* If there is still bitmap IO pending, probably because of a previous
2006          * resync just being finished, wait for it before requesting a new resync. */
2007         drbd_suspend_io(mdev);
2008         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2009
2010         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
2011
2012         if (retcode < SS_SUCCESS) {
2013                 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
2014                         /* The peer will get a resync upon connect anyways. Just make that
2015                            into a full resync. */
2016                         retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
2017                         if (retcode >= SS_SUCCESS) {
2018                                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
2019                                         "set_n_write from invalidate_peer",
2020                                         BM_LOCKED_SET_ALLOWED))
2021                                         retcode = ERR_IO_MD_DISK;
2022                         }
2023                 } else
2024                         retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
2025         }
2026         drbd_resume_io(mdev);
2027
2028         reply->ret_code = retcode;
2029         return 0;
2030 }
2031
2032 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2033                               struct drbd_nl_cfg_reply *reply)
2034 {
2035         int retcode = NO_ERROR;
2036
2037         if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2038                 retcode = ERR_PAUSE_IS_SET;
2039
2040         reply->ret_code = retcode;
2041         return 0;
2042 }
2043
2044 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2045                                struct drbd_nl_cfg_reply *reply)
2046 {
2047         int retcode = NO_ERROR;
2048         union drbd_state s;
2049
2050         if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2051                 s = mdev->state;
2052                 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2053                         retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2054                                   s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2055                 } else {
2056                         retcode = ERR_PAUSE_IS_CLEAR;
2057                 }
2058         }
2059
2060         reply->ret_code = retcode;
2061         return 0;
2062 }
2063
2064 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2065                               struct drbd_nl_cfg_reply *reply)
2066 {
2067         reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
2068
2069         return 0;
2070 }
2071
2072 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2073                              struct drbd_nl_cfg_reply *reply)
2074 {
2075         if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2076                 drbd_uuid_new_current(mdev);
2077                 clear_bit(NEW_CUR_UUID, &mdev->flags);
2078         }
2079         drbd_suspend_io(mdev);
2080         reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2081         if (reply->ret_code == SS_SUCCESS) {
2082                 if (mdev->state.conn < C_CONNECTED)
2083                         tl_clear(mdev);
2084                 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2085                         tl_restart(mdev, fail_frozen_disk_io);
2086         }
2087         drbd_resume_io(mdev);
2088
2089         return 0;
2090 }
2091
2092 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2093                            struct drbd_nl_cfg_reply *reply)
2094 {
2095         reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
2096         return 0;
2097 }
2098
2099 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2100                            struct drbd_nl_cfg_reply *reply)
2101 {
2102         unsigned short *tl;
2103
2104         tl = reply->tag_list;
2105
2106         if (get_ldev(mdev)) {
2107                 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
2108                 put_ldev(mdev);
2109         }
2110
2111         if (get_net_conf(mdev)) {
2112                 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
2113                 put_net_conf(mdev);
2114         }
2115         tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
2116
2117         put_unaligned(TT_END, tl++); /* Close the tag list */
2118
2119         return (int)((char *)tl - (char *)reply->tag_list);
2120 }
2121
2122 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2123                              struct drbd_nl_cfg_reply *reply)
2124 {
2125         unsigned short *tl = reply->tag_list;
2126         union drbd_state s = mdev->state;
2127         unsigned long rs_left;
2128         unsigned int res;
2129
2130         tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
2131
2132         /* no local ref, no bitmap, no syncer progress. */
2133         if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
2134                 if (get_ldev(mdev)) {
2135                         drbd_get_syncer_progress(mdev, &rs_left, &res);
2136                         tl = tl_add_int(tl, T_sync_progress, &res);
2137                         put_ldev(mdev);
2138                 }
2139         }
2140         put_unaligned(TT_END, tl++); /* Close the tag list */
2141
2142         return (int)((char *)tl - (char *)reply->tag_list);
2143 }
2144
2145 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2146                              struct drbd_nl_cfg_reply *reply)
2147 {
2148         unsigned short *tl;
2149
2150         tl = reply->tag_list;
2151
2152         if (get_ldev(mdev)) {
2153                 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
2154                 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
2155                 put_ldev(mdev);
2156         }
2157         put_unaligned(TT_END, tl++); /* Close the tag list */
2158
2159         return (int)((char *)tl - (char *)reply->tag_list);
2160 }
2161
2162 /**
2163  * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
2164  * @mdev:       DRBD device.
2165  * @nlp:        Netlink/connector packet from drbdsetup
2166  * @reply:      Reply packet for drbdsetup
2167  */
2168 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2169                                     struct drbd_nl_cfg_reply *reply)
2170 {
2171         unsigned short *tl;
2172         char rv;
2173
2174         tl = reply->tag_list;
2175
2176         rv = mdev->state.pdsk == D_OUTDATED        ? UT_PEER_OUTDATED :
2177           test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
2178
2179         tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
2180         put_unaligned(TT_END, tl++); /* Close the tag list */
2181
2182         return (int)((char *)tl - (char *)reply->tag_list);
2183 }
2184
2185 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2186                                     struct drbd_nl_cfg_reply *reply)
2187 {
2188         /* default to resume from last known position, if possible */
2189         struct start_ov args =
2190                 { .start_sector = mdev->ov_start_sector };
2191
2192         if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
2193                 reply->ret_code = ERR_MANDATORY_TAG;
2194                 return 0;
2195         }
2196
2197         /* If there is still bitmap IO pending, e.g. previous resync or verify
2198          * just being finished, wait for it before requesting a new resync. */
2199         drbd_suspend_io(mdev);
2200         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2201
2202         /* w_make_ov_request expects position to be aligned */
2203         mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
2204         reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2205         drbd_resume_io(mdev);
2206         return 0;
2207 }
2208
2209
2210 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2211                               struct drbd_nl_cfg_reply *reply)
2212 {
2213         int retcode = NO_ERROR;
2214         int skip_initial_sync = 0;
2215         int err;
2216
2217         struct new_c_uuid args;
2218
2219         memset(&args, 0, sizeof(struct new_c_uuid));
2220         if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
2221                 reply->ret_code = ERR_MANDATORY_TAG;
2222                 return 0;
2223         }
2224
2225         mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
2226
2227         if (!get_ldev(mdev)) {
2228                 retcode = ERR_NO_DISK;
2229                 goto out;
2230         }
2231
2232         /* this is "skip initial sync", assume to be clean */
2233         if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
2234             mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2235                 dev_info(DEV, "Preparing to skip initial sync\n");
2236                 skip_initial_sync = 1;
2237         } else if (mdev->state.conn != C_STANDALONE) {
2238                 retcode = ERR_CONNECTED;
2239                 goto out_dec;
2240         }
2241
2242         drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2243         drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2244
2245         if (args.clear_bm) {
2246                 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
2247                         "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
2248                 if (err) {
2249                         dev_err(DEV, "Writing bitmap failed with %d\n",err);
2250                         retcode = ERR_IO_MD_DISK;
2251                 }
2252                 if (skip_initial_sync) {
2253                         drbd_send_uuids_skip_initial_sync(mdev);
2254                         _drbd_uuid_set(mdev, UI_BITMAP, 0);
2255                         drbd_print_uuids(mdev, "cleared bitmap UUID");
2256                         spin_lock_irq(&mdev->req_lock);
2257                         _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2258                                         CS_VERBOSE, NULL);
2259                         spin_unlock_irq(&mdev->req_lock);
2260                 }
2261         }
2262
2263         drbd_md_sync(mdev);
2264 out_dec:
2265         put_ldev(mdev);
2266 out:
2267         mutex_unlock(&mdev->state_mutex);
2268
2269         reply->ret_code = retcode;
2270         return 0;
2271 }
2272
2273 struct cn_handler_struct {
2274         int (*function)(struct drbd_conf *,
2275                          struct drbd_nl_cfg_req *,
2276                          struct drbd_nl_cfg_reply *);
2277         int reply_body_size;
2278 };
2279
2280 static struct cn_handler_struct cnd_table[] = {
2281         [ P_primary ]           = { &drbd_nl_primary,           0 },
2282         [ P_secondary ]         = { &drbd_nl_secondary,         0 },
2283         [ P_disk_conf ]         = { &drbd_nl_disk_conf,         0 },
2284         [ P_detach ]            = { &drbd_nl_detach,            0 },
2285         [ P_net_conf ]          = { &drbd_nl_net_conf,          0 },
2286         [ P_disconnect ]        = { &drbd_nl_disconnect,        0 },
2287         [ P_resize ]            = { &drbd_nl_resize,            0 },
2288         [ P_syncer_conf ]       = { &drbd_nl_syncer_conf,       0 },
2289         [ P_invalidate ]        = { &drbd_nl_invalidate,        0 },
2290         [ P_invalidate_peer ]   = { &drbd_nl_invalidate_peer,   0 },
2291         [ P_pause_sync ]        = { &drbd_nl_pause_sync,        0 },
2292         [ P_resume_sync ]       = { &drbd_nl_resume_sync,       0 },
2293         [ P_suspend_io ]        = { &drbd_nl_suspend_io,        0 },
2294         [ P_resume_io ]         = { &drbd_nl_resume_io,         0 },
2295         [ P_outdate ]           = { &drbd_nl_outdate,           0 },
2296         [ P_get_config ]        = { &drbd_nl_get_config,
2297                                     sizeof(struct syncer_conf_tag_len_struct) +
2298                                     sizeof(struct disk_conf_tag_len_struct) +
2299                                     sizeof(struct net_conf_tag_len_struct) },
2300         [ P_get_state ]         = { &drbd_nl_get_state,
2301                                     sizeof(struct get_state_tag_len_struct) +
2302                                     sizeof(struct sync_progress_tag_len_struct) },
2303         [ P_get_uuids ]         = { &drbd_nl_get_uuids,
2304                                     sizeof(struct get_uuids_tag_len_struct) },
2305         [ P_get_timeout_flag ]  = { &drbd_nl_get_timeout_flag,
2306                                     sizeof(struct get_timeout_flag_tag_len_struct)},
2307         [ P_start_ov ]          = { &drbd_nl_start_ov,          0 },
2308         [ P_new_c_uuid ]        = { &drbd_nl_new_c_uuid,        0 },
2309 };
2310
2311 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
2312 {
2313         struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2314         struct cn_handler_struct *cm;
2315         struct cn_msg *cn_reply;
2316         struct drbd_nl_cfg_reply *reply;
2317         struct drbd_conf *mdev;
2318         int retcode, rr;
2319         int reply_size = sizeof(struct cn_msg)
2320                 + sizeof(struct drbd_nl_cfg_reply)
2321                 + sizeof(short int);
2322
2323         if (!try_module_get(THIS_MODULE)) {
2324                 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2325                 return;
2326         }
2327
2328         if (!capable(CAP_SYS_ADMIN)) {
2329                 retcode = ERR_PERM;
2330                 goto fail;
2331         }
2332
2333         mdev = ensure_mdev(nlp->drbd_minor,
2334                         (nlp->flags & DRBD_NL_CREATE_DEVICE));
2335         if (!mdev) {
2336                 retcode = ERR_MINOR_INVALID;
2337                 goto fail;
2338         }
2339
2340         if (nlp->packet_type >= P_nl_after_last_packet ||
2341             nlp->packet_type == P_return_code_only) {
2342                 retcode = ERR_PACKET_NR;
2343                 goto fail;
2344         }
2345
2346         cm = cnd_table + nlp->packet_type;
2347
2348         /* This may happen if packet number is 0: */
2349         if (cm->function == NULL) {
2350                 retcode = ERR_PACKET_NR;
2351                 goto fail;
2352         }
2353
2354         reply_size += cm->reply_body_size;
2355
2356         /* allocation not in the IO path, cqueue thread context */
2357         cn_reply = kzalloc(reply_size, GFP_KERNEL);
2358         if (!cn_reply) {
2359                 retcode = ERR_NOMEM;
2360                 goto fail;
2361         }
2362         reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2363
2364         reply->packet_type =
2365                 cm->reply_body_size ? nlp->packet_type : P_return_code_only;
2366         reply->minor = nlp->drbd_minor;
2367         reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2368         /* reply->tag_list; might be modified by cm->function. */
2369
2370         rr = cm->function(mdev, nlp, reply);
2371
2372         cn_reply->id = req->id;
2373         cn_reply->seq = req->seq;
2374         cn_reply->ack = req->ack  + 1;
2375         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2376         cn_reply->flags = 0;
2377
2378         rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2379         if (rr && rr != -ESRCH)
2380                 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2381
2382         kfree(cn_reply);
2383         module_put(THIS_MODULE);
2384         return;
2385  fail:
2386         drbd_nl_send_reply(req, retcode);
2387         module_put(THIS_MODULE);
2388 }
2389
2390 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2391
2392 static unsigned short *
2393 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2394         unsigned short len, int nul_terminated)
2395 {
2396         unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2397         len = (len < l) ? len :  l;
2398         put_unaligned(tag, tl++);
2399         put_unaligned(len, tl++);
2400         memcpy(tl, data, len);
2401         tl = (unsigned short*)((char*)tl + len);
2402         if (nul_terminated)
2403                 *((char*)tl - 1) = 0;
2404         return tl;
2405 }
2406
2407 static unsigned short *
2408 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2409 {
2410         return __tl_add_blob(tl, tag, data, len, 0);
2411 }
2412
2413 static unsigned short *
2414 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2415 {
2416         return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2417 }
2418
2419 static unsigned short *
2420 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2421 {
2422         put_unaligned(tag, tl++);
2423         switch(tag_type(tag)) {
2424         case TT_INTEGER:
2425                 put_unaligned(sizeof(int), tl++);
2426                 put_unaligned(*(int *)val, (int *)tl);
2427                 tl = (unsigned short*)((char*)tl+sizeof(int));
2428                 break;
2429         case TT_INT64:
2430                 put_unaligned(sizeof(u64), tl++);
2431                 put_unaligned(*(u64 *)val, (u64 *)tl);
2432                 tl = (unsigned short*)((char*)tl+sizeof(u64));
2433                 break;
2434         default:
2435                 /* someone did something stupid. */
2436                 ;
2437         }
2438         return tl;
2439 }
2440
2441 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2442 {
2443         char buffer[sizeof(struct cn_msg)+
2444                     sizeof(struct drbd_nl_cfg_reply)+
2445                     sizeof(struct get_state_tag_len_struct)+
2446                     sizeof(short int)];
2447         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2448         struct drbd_nl_cfg_reply *reply =
2449                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2450         unsigned short *tl = reply->tag_list;
2451
2452         /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2453
2454         tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2455
2456         put_unaligned(TT_END, tl++); /* Close the tag list */
2457
2458         cn_reply->id.idx = CN_IDX_DRBD;
2459         cn_reply->id.val = CN_VAL_DRBD;
2460
2461         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2462         cn_reply->ack = 0; /* not used here. */
2463         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2464                 (int)((char *)tl - (char *)reply->tag_list);
2465         cn_reply->flags = 0;
2466
2467         reply->packet_type = P_get_state;
2468         reply->minor = mdev_to_minor(mdev);
2469         reply->ret_code = NO_ERROR;
2470
2471         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2472 }
2473
2474 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2475 {
2476         char buffer[sizeof(struct cn_msg)+
2477                     sizeof(struct drbd_nl_cfg_reply)+
2478                     sizeof(struct call_helper_tag_len_struct)+
2479                     sizeof(short int)];
2480         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2481         struct drbd_nl_cfg_reply *reply =
2482                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2483         unsigned short *tl = reply->tag_list;
2484
2485         /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2486
2487         tl = tl_add_str(tl, T_helper, helper_name);
2488         put_unaligned(TT_END, tl++); /* Close the tag list */
2489
2490         cn_reply->id.idx = CN_IDX_DRBD;
2491         cn_reply->id.val = CN_VAL_DRBD;
2492
2493         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2494         cn_reply->ack = 0; /* not used here. */
2495         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2496                 (int)((char *)tl - (char *)reply->tag_list);
2497         cn_reply->flags = 0;
2498
2499         reply->packet_type = P_call_helper;
2500         reply->minor = mdev_to_minor(mdev);
2501         reply->ret_code = NO_ERROR;
2502
2503         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2504 }
2505
2506 void drbd_bcast_ee(struct drbd_conf *mdev,
2507                 const char *reason, const int dgs,
2508                 const char* seen_hash, const char* calc_hash,
2509                 const struct drbd_epoch_entry* e)
2510 {
2511         struct cn_msg *cn_reply;
2512         struct drbd_nl_cfg_reply *reply;
2513         unsigned short *tl;
2514         struct page *page;
2515         unsigned len;
2516
2517         if (!e)
2518                 return;
2519         if (!reason || !reason[0])
2520                 return;
2521
2522         /* apparently we have to memcpy twice, first to prepare the data for the
2523          * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2524          * netlink skb. */
2525         /* receiver thread context, which is not in the writeout path (of this node),
2526          * but may be in the writeout path of the _other_ node.
2527          * GFP_NOIO to avoid potential "distributed deadlock". */
2528         cn_reply = kzalloc(
2529                 sizeof(struct cn_msg)+
2530                 sizeof(struct drbd_nl_cfg_reply)+
2531                 sizeof(struct dump_ee_tag_len_struct)+
2532                 sizeof(short int),
2533                 GFP_NOIO);
2534
2535         if (!cn_reply) {
2536                 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2537                                 (unsigned long long)e->sector, e->size);
2538                 return;
2539         }
2540
2541         reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2542         tl = reply->tag_list;
2543
2544         tl = tl_add_str(tl, T_dump_ee_reason, reason);
2545         tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2546         tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2547         tl = tl_add_int(tl, T_ee_sector, &e->sector);
2548         tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2549
2550         /* dump the first 32k */
2551         len = min_t(unsigned, e->size, 32 << 10);
2552         put_unaligned(T_ee_data, tl++);
2553         put_unaligned(len, tl++);
2554
2555         page = e->pages;
2556         page_chain_for_each(page) {
2557                 void *d = kmap_atomic(page);
2558                 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2559                 memcpy(tl, d, l);
2560                 kunmap_atomic(d);
2561                 tl = (unsigned short*)((char*)tl + l);
2562                 len -= l;
2563                 if (len == 0)
2564                         break;
2565         }
2566         put_unaligned(TT_END, tl++); /* Close the tag list */
2567
2568         cn_reply->id.idx = CN_IDX_DRBD;
2569         cn_reply->id.val = CN_VAL_DRBD;
2570
2571         cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2572         cn_reply->ack = 0; // not used here.
2573         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2574                 (int)((char*)tl - (char*)reply->tag_list);
2575         cn_reply->flags = 0;
2576
2577         reply->packet_type = P_dump_ee;
2578         reply->minor = mdev_to_minor(mdev);
2579         reply->ret_code = NO_ERROR;
2580
2581         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2582         kfree(cn_reply);
2583 }
2584
2585 void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2586 {
2587         char buffer[sizeof(struct cn_msg)+
2588                     sizeof(struct drbd_nl_cfg_reply)+
2589                     sizeof(struct sync_progress_tag_len_struct)+
2590                     sizeof(short int)];
2591         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2592         struct drbd_nl_cfg_reply *reply =
2593                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2594         unsigned short *tl = reply->tag_list;
2595         unsigned long rs_left;
2596         unsigned int res;
2597
2598         /* no local ref, no bitmap, no syncer progress, no broadcast. */
2599         if (!get_ldev(mdev))
2600                 return;
2601         drbd_get_syncer_progress(mdev, &rs_left, &res);
2602         put_ldev(mdev);
2603
2604         tl = tl_add_int(tl, T_sync_progress, &res);
2605         put_unaligned(TT_END, tl++); /* Close the tag list */
2606
2607         cn_reply->id.idx = CN_IDX_DRBD;
2608         cn_reply->id.val = CN_VAL_DRBD;
2609
2610         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2611         cn_reply->ack = 0; /* not used here. */
2612         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2613                 (int)((char *)tl - (char *)reply->tag_list);
2614         cn_reply->flags = 0;
2615
2616         reply->packet_type = P_sync_progress;
2617         reply->minor = mdev_to_minor(mdev);
2618         reply->ret_code = NO_ERROR;
2619
2620         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2621 }
2622
2623 int __init drbd_nl_init(void)
2624 {
2625         static struct cb_id cn_id_drbd;
2626         int err, try=10;
2627
2628         cn_id_drbd.val = CN_VAL_DRBD;
2629         do {
2630                 cn_id_drbd.idx = cn_idx;
2631                 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2632                 if (!err)
2633                         break;
2634                 cn_idx = (cn_idx + CN_IDX_STEP);
2635         } while (try--);
2636
2637         if (err) {
2638                 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2639                 return err;
2640         }
2641
2642         return 0;
2643 }
2644
2645 void drbd_nl_cleanup(void)
2646 {
2647         static struct cb_id cn_id_drbd;
2648
2649         cn_id_drbd.idx = cn_idx;
2650         cn_id_drbd.val = CN_VAL_DRBD;
2651
2652         cn_del_callback(&cn_id_drbd);
2653 }
2654
2655 void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2656 {
2657         char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2658         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2659         struct drbd_nl_cfg_reply *reply =
2660                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2661         int rr;
2662
2663         memset(buffer, 0, sizeof(buffer));
2664         cn_reply->id = req->id;
2665
2666         cn_reply->seq = req->seq;
2667         cn_reply->ack = req->ack  + 1;
2668         cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2669         cn_reply->flags = 0;
2670
2671         reply->packet_type = P_return_code_only;
2672         reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2673         reply->ret_code = ret_code;
2674
2675         rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2676         if (rr && rr != -ESRCH)
2677                 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2678 }
2679