Pileus Git - ~andy/linux/blob - 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         if (current == mdev->worker.task)
 151                 set_bit(CALLBACK_PENDING, &mdev->flags);
 152
 153         snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
 154
 155         if (get_net_conf(mdev)) {
 156                 switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) {
 157                 case AF_INET6:
 158                         afs = "ipv6";
 159                         snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6",
 160                                  &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr);
 161                         break;
 162                 case AF_INET:
 163                         afs = "ipv4";
 164                         snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
 165                                  &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
 166                         break;
 167                 default:
 168                         afs = "ssocks";
 169                         snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
 170                                  &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
 171                 }
 172                 snprintf(af, 20, "DRBD_PEER_AF=%s", afs);
 173                 envp[3]=af;
 174                 envp[4]=ad;
 175                 put_net_conf(mdev);
 176         }
 177
 178         /* The helper may take some time.
 179          * write out any unsynced meta data changes now */
 180         drbd_md_sync(mdev);
 181
 182         dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
 183
 184         drbd_bcast_ev_helper(mdev, cmd);
 185         ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
 186         if (ret)
 187                 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 188                                 usermode_helper, cmd, mb,
 189                                 (ret >> 8) & 0xff, ret);
 190         else
 191                 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 192                                 usermode_helper, cmd, mb,
 193                                 (ret >> 8) & 0xff, ret);
 194
 195         if (current == mdev->worker.task)
 196                 clear_bit(CALLBACK_PENDING, &mdev->flags);
 197
 198         if (ret < 0) /* Ignore any ERRNOs we got. */
 199                 ret = 0;
 200
 201         return ret;
 202 }
 203
 204 enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
 205 {
 206         char *ex_to_string;
 207         int r;
 208         enum drbd_disk_state nps;
 209         enum drbd_fencing_p fp;
 210
 211         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 212
 213         if (get_ldev_if_state(mdev, D_CONSISTENT)) {
 214                 fp = mdev->ldev->dc.fencing;
 215                 put_ldev(mdev);
 216         } else {
 217                 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
 218                 nps = mdev->state.pdsk;
 219                 goto out;
 220         }
 221
 222         r = drbd_khelper(mdev, "fence-peer");
 223
 224         switch ((r>>8) & 0xff) {
 225         case 3: /* peer is inconsistent */
 226                 ex_to_string = "peer is inconsistent or worse";
 227                 nps = D_INCONSISTENT;
 228                 break;
 229         case 4: /* peer got outdated, or was already outdated */
 230                 ex_to_string = "peer was fenced";
 231                 nps = D_OUTDATED;
 232                 break;
 233         case 5: /* peer was down */
 234                 if (mdev->state.disk == D_UP_TO_DATE) {
 235                         /* we will(have) create(d) a new UUID anyways... */
 236                         ex_to_string = "peer is unreachable, assumed to be dead";
 237                         nps = D_OUTDATED;
 238                 } else {
 239                         ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
 240                         nps = mdev->state.pdsk;
 241                 }
 242                 break;
 243         case 6: /* Peer is primary, voluntarily outdate myself.
 244                  * This is useful when an unconnected R_SECONDARY is asked to
 245                  * become R_PRIMARY, but finds the other peer being active. */
 246                 ex_to_string = "peer is active";
 247                 dev_warn(DEV, "Peer is primary, outdating myself.\n");
 248                 nps = D_UNKNOWN;
 249                 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
 250                 break;
 251         case 7:
 252                 if (fp != FP_STONITH)
 253                         dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
 254                 ex_to_string = "peer was stonithed";
 255                 nps = D_OUTDATED;
 256                 break;
 257         default:
 258                 /* The script is broken ... */
 259                 nps = D_UNKNOWN;
 260                 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
 261                 return nps;
 262         }
 263
 264         dev_info(DEV, "fence-peer helper returned %d (%s)\n",
 265                         (r>>8) & 0xff, ex_to_string);
 266
 267 out:
 268         if (mdev->state.susp_fen && nps >= D_UNKNOWN) {
 269                 /* The handler was not successful... unfreeze here, the
 270                    state engine can not unfreeze... */
 271                 _drbd_request_state(mdev, NS(susp_fen, 0), CS_VERBOSE);
 272         }
 273
 274         return nps;
 275 }
 276
 277 static int _try_outdate_peer_async(void *data)
 278 {
 279         struct drbd_conf *mdev = (struct drbd_conf *)data;
 280         enum drbd_disk_state nps;
 281         union drbd_state ns;
 282
 283         nps = drbd_try_outdate_peer(mdev);
 284
 285         /* Not using
 286            drbd_request_state(mdev, NS(pdsk, nps));
 287            here, because we might were able to re-establish the connection
 288            in the meantime. This can only partially be solved in the state's
 289            engine is_valid_state() and is_valid_state_transition()
 290            functions.
 291
 292            nps can be D_INCONSISTENT, D_OUTDATED or D_UNKNOWN.
 293            pdsk == D_INCONSISTENT while conn >= C_CONNECTED is valid,
 294            therefore we have to have the pre state change check here.
 295         */
 296         spin_lock_irq(&mdev->req_lock);
 297         ns = mdev->state;
 298         if (ns.conn < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &mdev->flags)) {
 299                 ns.pdsk = nps;
 300                 _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
 301         }
 302         spin_unlock_irq(&mdev->req_lock);
 303
 304         return 0;
 305 }
 306
 307 void drbd_try_outdate_peer_async(struct drbd_conf *mdev)
 308 {
 309         struct task_struct *opa;
 310
 311         opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev));
 312         if (IS_ERR(opa))
 313                 dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n");
 314 }
 315
 316 enum drbd_state_rv
 317 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
 318 {
 319         const int max_tries = 4;
 320         enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
 321         int try = 0;
 322         int forced = 0;
 323         union drbd_state mask, val;
 324         enum drbd_disk_state nps;
 325
 326         if (new_role == R_PRIMARY)
 327                 request_ping(mdev); /* Detect a dead peer ASAP */
 328
 329         mutex_lock(&mdev->state_mutex);
 330
 331         mask.i = 0; mask.role = R_MASK;
 332         val.i  = 0; val.role  = new_role;
 333
 334         while (try++ < max_tries) {
 335                 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
 336
 337                 /* in case we first succeeded to outdate,
 338                  * but now suddenly could establish a connection */
 339                 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
 340                         val.pdsk = 0;
 341                         mask.pdsk = 0;
 342                         continue;
 343                 }
 344
 345                 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
 346                     (mdev->state.disk < D_UP_TO_DATE &&
 347                      mdev->state.disk >= D_INCONSISTENT)) {
 348                         mask.disk = D_MASK;
 349                         val.disk  = D_UP_TO_DATE;
 350                         forced = 1;
 351                         continue;
 352                 }
 353
 354                 if (rv == SS_NO_UP_TO_DATE_DISK &&
 355                     mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
 356                         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 357                         nps = drbd_try_outdate_peer(mdev);
 358
 359                         if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
 360                                 val.disk = D_UP_TO_DATE;
 361                                 mask.disk = D_MASK;
 362                         }
 363
 364                         val.pdsk = nps;
 365                         mask.pdsk = D_MASK;
 366
 367                         continue;
 368                 }
 369
 370                 if (rv == SS_NOTHING_TO_DO)
 371                         goto fail;
 372                 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
 373                         nps = drbd_try_outdate_peer(mdev);
 374
 375                         if (force && nps > D_OUTDATED) {
 376                                 dev_warn(DEV, "Forced into split brain situation!\n");
 377                                 nps = D_OUTDATED;
 378                         }
 379
 380                         mask.pdsk = D_MASK;
 381                         val.pdsk  = nps;
 382
 383                         continue;
 384                 }
 385                 if (rv == SS_TWO_PRIMARIES) {
 386                         /* Maybe the peer is detected as dead very soon...
 387                            retry at most once more in this case. */
 388                         schedule_timeout_interruptible((mdev->net_conf->ping_timeo+1)*HZ/10);
 389                         if (try < max_tries)
 390                                 try = max_tries - 1;
 391                         continue;
 392                 }
 393                 if (rv < SS_SUCCESS) {
 394                         rv = _drbd_request_state(mdev, mask, val,
 395                                                 CS_VERBOSE + CS_WAIT_COMPLETE);
 396                         if (rv < SS_SUCCESS)
 397                                 goto fail;
 398                 }
 399                 break;
 400         }
 401
 402         if (rv < SS_SUCCESS)
 403                 goto fail;
 404
 405         if (forced)
 406                 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
 407
 408         /* Wait until nothing is on the fly :) */
 409         wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
 410
 411         if (new_role == R_SECONDARY) {
 412                 set_disk_ro(mdev->vdisk, true);
 413                 if (get_ldev(mdev)) {
 414                         mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
 415                         put_ldev(mdev);
 416                 }
 417         } else {
 418                 if (get_net_conf(mdev)) {
 419                         mdev->net_conf->want_lose = 0;
 420                         put_net_conf(mdev);
 421                 }
 422                 set_disk_ro(mdev->vdisk, false);
 423                 if (get_ldev(mdev)) {
 424                         if (((mdev->state.conn < C_CONNECTED ||
 425                                mdev->state.pdsk <= D_FAILED)
 426                               && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
 427                                 drbd_uuid_new_current(mdev);
 428
 429                         mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
 430                         put_ldev(mdev);
 431                 }
 432         }
 433
 434         /* writeout of activity log covered areas of the bitmap
 435          * to stable storage done in after state change already */
 436
 437         if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
 438                 /* if this was forced, we should consider sync */
 439                 if (forced)
 440                         drbd_send_uuids(mdev);
 441                 drbd_send_current_state(mdev);
 442         }
 443
 444         drbd_md_sync(mdev);
 445
 446         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
 447  fail:
 448         mutex_unlock(&mdev->state_mutex);
 449         return rv;
 450 }
 451
 452 static struct drbd_conf *ensure_mdev(int minor, int create)
 453 {
 454         struct drbd_conf *mdev;
 455
 456         if (minor >= minor_count)
 457                 return NULL;
 458
 459         mdev = minor_to_mdev(minor);
 460
 461         if (!mdev && create) {
 462                 struct gendisk *disk = NULL;
 463                 mdev = drbd_new_device(minor);
 464
 465                 spin_lock_irq(&drbd_pp_lock);
 466                 if (minor_table[minor] == NULL) {
 467                         minor_table[minor] = mdev;
 468                         disk = mdev->vdisk;
 469                         mdev = NULL;
 470                 } /* else: we lost the race */
 471                 spin_unlock_irq(&drbd_pp_lock);
 472
 473                 if (disk) /* we won the race above */
 474                         /* in case we ever add a drbd_delete_device(),
 475                          * don't forget the del_gendisk! */
 476                         add_disk(disk);
 477                 else /* we lost the race above */
 478                         drbd_free_mdev(mdev);
 479
 480                 mdev = minor_to_mdev(minor);
 481         }
 482
 483         return mdev;
 484 }
 485
 486 static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
 487                            struct drbd_nl_cfg_reply *reply)
 488 {
 489         struct primary primary_args;
 490
 491         memset(&primary_args, 0, sizeof(struct primary));
 492         if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
 493                 reply->ret_code = ERR_MANDATORY_TAG;
 494                 return 0;
 495         }
 496
 497         reply->ret_code =
 498                 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force);
 499
 500         return 0;
 501 }
 502
 503 static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
 504                              struct drbd_nl_cfg_reply *reply)
 505 {
 506         reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
 507
 508         return 0;
 509 }
 510
 511 /* initializes the md.*_offset members, so we are able to find
 512  * the on disk meta data */
 513 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
 514                                        struct drbd_backing_dev *bdev)
 515 {
 516         sector_t md_size_sect = 0;
 517         switch (bdev->dc.meta_dev_idx) {
 518         default:
 519                 /* v07 style fixed size indexed meta data */
 520                 bdev->md.md_size_sect = MD_RESERVED_SECT;
 521                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 522                 bdev->md.al_offset = MD_AL_OFFSET;
 523                 bdev->md.bm_offset = MD_BM_OFFSET;
 524                 break;
 525         case DRBD_MD_INDEX_FLEX_EXT:
 526                 /* just occupy the full device; unit: sectors */
 527                 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
 528                 bdev->md.md_offset = 0;
 529                 bdev->md.al_offset = MD_AL_OFFSET;
 530                 bdev->md.bm_offset = MD_BM_OFFSET;
 531                 break;
 532         case DRBD_MD_INDEX_INTERNAL:
 533         case DRBD_MD_INDEX_FLEX_INT:
 534                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 535                 /* al size is still fixed */
 536                 bdev->md.al_offset = -MD_AL_MAX_SIZE;
 537                 /* we need (slightly less than) ~ this much bitmap sectors: */
 538                 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
 539                 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
 540                 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
 541                 md_size_sect = ALIGN(md_size_sect, 8);
 542
 543                 /* plus the "drbd meta data super block",
 544                  * and the activity log; */
 545                 md_size_sect += MD_BM_OFFSET;
 546
 547                 bdev->md.md_size_sect = md_size_sect;
 548                 /* bitmap offset is adjusted by 'super' block size */
 549                 bdev->md.bm_offset   = -md_size_sect + MD_AL_OFFSET;
 550                 break;
 551         }
 552 }
 553
 554 /* input size is expected to be in KB */
 555 char *ppsize(char *buf, unsigned long long size)
 556 {
 557         /* Needs 9 bytes at max including trailing NUL:
 558          * -1ULL ==> "16384 EB" */
 559         static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
 560         int base = 0;
 561         while (size >= 10000 && base < sizeof(units)-1) {
 562                 /* shift + round */
 563                 size = (size >> 10) + !!(size & (1<<9));
 564                 base++;
 565         }
 566         sprintf(buf, "%u %cB", (unsigned)size, units[base]);
 567
 568         return buf;
 569 }
 570
 571 /* there is still a theoretical deadlock when called from receiver
 572  * on an D_INCONSISTENT R_PRIMARY:
 573  *  remote READ does inc_ap_bio, receiver would need to receive answer
 574  *  packet from remote to dec_ap_bio again.
 575  *  receiver receive_sizes(), comes here,
 576  *  waits for ap_bio_cnt == 0. -> deadlock.
 577  * but this cannot happen, actually, because:
 578  *  R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
 579  *  (not connected, or bad/no disk on peer):
 580  *  see drbd_fail_request_early, ap_bio_cnt is zero.
 581  *  R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
 582  *  peer may not initiate a resize.
 583  */
 584 void drbd_suspend_io(struct drbd_conf *mdev)
 585 {
 586         set_bit(SUSPEND_IO, &mdev->flags);
 587         if (is_susp(mdev->state))
 588                 return;
 589         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
 590 }
 591
 592 void drbd_resume_io(struct drbd_conf *mdev)
 593 {
 594         clear_bit(SUSPEND_IO, &mdev->flags);
 595         wake_up(&mdev->misc_wait);
 596 }
 597
 598 /**
 599  * drbd_determine_dev_size() -  Sets the right device size obeying all constraints
 600  * @mdev:       DRBD device.
 601  *
 602  * Returns 0 on success, negative return values indicate errors.
 603  * You should call drbd_md_sync() after calling this function.
 604  */
 605 enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
 606 {
 607         sector_t prev_first_sect, prev_size; /* previous meta location */
 608         sector_t la_size;
 609         sector_t size;
 610         char ppb[10];
 611
 612         int md_moved, la_size_changed;
 613         enum determine_dev_size rv = unchanged;
 614
 615         /* race:
 616          * application request passes inc_ap_bio,
 617          * but then cannot get an AL-reference.
 618          * this function later may wait on ap_bio_cnt == 0. -> deadlock.
 619          *
 620          * to avoid that:
 621          * Suspend IO right here.
 622          * still lock the act_log to not trigger ASSERTs there.
 623          */
 624         drbd_suspend_io(mdev);
 625
 626         /* no wait necessary anymore, actually we could assert that */
 627         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
 628
 629         prev_first_sect = drbd_md_first_sector(mdev->ldev);
 630         prev_size = mdev->ldev->md.md_size_sect;
 631         la_size = mdev->ldev->md.la_size_sect;
 632
 633         /* TODO: should only be some assert here, not (re)init... */
 634         drbd_md_set_sector_offsets(mdev, mdev->ldev);
 635
 636         size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED);
 637
 638         if (drbd_get_capacity(mdev->this_bdev) != size ||
 639             drbd_bm_capacity(mdev) != size) {
 640                 int err;
 641                 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
 642                 if (unlikely(err)) {
 643                         /* currently there is only one error: ENOMEM! */
 644                         size = drbd_bm_capacity(mdev)>>1;
 645                         if (size == 0) {
 646                                 dev_err(DEV, "OUT OF MEMORY! "
 647                                     "Could not allocate bitmap!\n");
 648                         } else {
 649                                 dev_err(DEV, "BM resizing failed. "
 650                                     "Leaving size unchanged at size = %lu KB\n",
 651                                     (unsigned long)size);
 652                         }
 653                         rv = dev_size_error;
 654                 }
 655                 /* racy, see comments above. */
 656                 drbd_set_my_capacity(mdev, size);
 657                 mdev->ldev->md.la_size_sect = size;
 658                 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
 659                      (unsigned long long)size>>1);
 660         }
 661         if (rv == dev_size_error)
 662                 goto out;
 663
 664         la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
 665
 666         md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
 667                 || prev_size       != mdev->ldev->md.md_size_sect;
 668
 669         if (la_size_changed || md_moved) {
 670                 int err;
 671
 672                 drbd_al_shrink(mdev); /* All extents inactive. */
 673                 dev_info(DEV, "Writing the whole bitmap, %s\n",
 674                          la_size_changed && md_moved ? "size changed and md moved" :
 675                          la_size_changed ? "size changed" : "md moved");
 676                 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
 677                 err = drbd_bitmap_io(mdev, &drbd_bm_write,
 678                                 "size changed", BM_LOCKED_MASK);
 679                 if (err) {
 680                         rv = dev_size_error;
 681                         goto out;
 682                 }
 683                 drbd_md_mark_dirty(mdev);
 684         }
 685
 686         if (size > la_size)
 687                 rv = grew;
 688         if (size < la_size)
 689                 rv = shrunk;
 690 out:
 691         lc_unlock(mdev->act_log);
 692         wake_up(&mdev->al_wait);
 693         drbd_resume_io(mdev);
 694
 695         return rv;
 696 }
 697
 698 sector_t
 699 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
 700 {
 701         sector_t p_size = mdev->p_size;   /* partner's disk size. */
 702         sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
 703         sector_t m_size; /* my size */
 704         sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
 705         sector_t size = 0;
 706
 707         m_size = drbd_get_max_capacity(bdev);
 708
 709         if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
 710                 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
 711                 p_size = m_size;
 712         }
 713
 714         if (p_size && m_size) {
 715                 size = min_t(sector_t, p_size, m_size);
 716         } else {
 717                 if (la_size) {
 718                         size = la_size;
 719                         if (m_size && m_size < size)
 720                                 size = m_size;
 721                         if (p_size && p_size < size)
 722                                 size = p_size;
 723                 } else {
 724                         if (m_size)
 725                                 size = m_size;
 726                         if (p_size)
 727                                 size = p_size;
 728                 }
 729         }
 730
 731         if (size == 0)
 732                 dev_err(DEV, "Both nodes diskless!\n");
 733
 734         if (u_size) {
 735                 if (u_size > size)
 736                         dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
 737                             (unsigned long)u_size>>1, (unsigned long)size>>1);
 738                 else
 739                         size = u_size;
 740         }
 741
 742         return size;
 743 }
 744
 745 /**
 746  * drbd_check_al_size() - Ensures that the AL is of the right size
 747  * @mdev:       DRBD device.
 748  *
 749  * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
 750  * failed, and 0 on success. You should call drbd_md_sync() after you called
 751  * this function.
 752  */
 753 static int drbd_check_al_size(struct drbd_conf *mdev)
 754 {
 755         struct lru_cache *n, *t;
 756         struct lc_element *e;
 757         unsigned int in_use;
 758         int i;
 759
 760         ERR_IF(mdev->sync_conf.al_extents < 7)
 761                 mdev->sync_conf.al_extents = 127;
 762
 763         if (mdev->act_log &&
 764             mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
 765                 return 0;
 766
 767         in_use = 0;
 768         t = mdev->act_log;
 769         n = lc_create("act_log", drbd_al_ext_cache,
 770                 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
 771
 772         if (n == NULL) {
 773                 dev_err(DEV, "Cannot allocate act_log lru!\n");
 774                 return -ENOMEM;
 775         }
 776         spin_lock_irq(&mdev->al_lock);
 777         if (t) {
 778                 for (i = 0; i < t->nr_elements; i++) {
 779                         e = lc_element_by_index(t, i);
 780                         if (e->refcnt)
 781                                 dev_err(DEV, "refcnt(%d)==%d\n",
 782                                     e->lc_number, e->refcnt);
 783                         in_use += e->refcnt;
 784                 }
 785         }
 786         if (!in_use)
 787                 mdev->act_log = n;
 788         spin_unlock_irq(&mdev->al_lock);
 789         if (in_use) {
 790                 dev_err(DEV, "Activity log still in use!\n");
 791                 lc_destroy(n);
 792                 return -EBUSY;
 793         } else {
 794                 if (t)
 795                         lc_destroy(t);
 796         }
 797         drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
 798         return 0;
 799 }
 800
 801 static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
 802 {
 803         struct request_queue * const q = mdev->rq_queue;
 804         unsigned int max_hw_sectors = max_bio_size >> 9;
 805         unsigned int max_segments = 0;
 806
 807         if (get_ldev_if_state(mdev, D_ATTACHING)) {
 808                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
 809
 810                 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
 811                 max_segments = mdev->ldev->dc.max_bio_bvecs;
 812                 put_ldev(mdev);
 813         }
 814
 815         blk_queue_logical_block_size(q, 512);
 816         blk_queue_max_hw_sectors(q, max_hw_sectors);
 817         /* This is the workaround for "bio would need to, but cannot, be split" */
 818         blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
 819         blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
 820
 821         if (get_ldev_if_state(mdev, D_ATTACHING)) {
 822                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
 823
 824                 blk_queue_stack_limits(q, b);
 825
 826                 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
 827                         dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
 828                                  q->backing_dev_info.ra_pages,
 829                                  b->backing_dev_info.ra_pages);
 830                         q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
 831                 }
 832                 put_ldev(mdev);
 833         }
 834 }
 835
 836 void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
 837 {
 838         unsigned int now, new, local, peer;
 839
 840         now = queue_max_hw_sectors(mdev->rq_queue) << 9;
 841         local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
 842         peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
 843
 844         if (get_ldev_if_state(mdev, D_ATTACHING)) {
 845                 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
 846                 mdev->local_max_bio_size = local;
 847                 put_ldev(mdev);
 848         }
 849         local = min(local, DRBD_MAX_BIO_SIZE);
 850
 851         /* We may ignore peer limits if the peer is modern enough.
 852            Because new from 8.3.8 onwards the peer can use multiple
 853            BIOs for a single peer_request */
 854         if (mdev->state.conn >= C_CONNECTED) {
 855                 if (mdev->agreed_pro_version < 94) {
 856                         peer = min(mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
 857                         /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
 858                 } else if (mdev->agreed_pro_version == 94)
 859                         peer = DRBD_MAX_SIZE_H80_PACKET;
 860                 else /* drbd 8.3.8 onwards */
 861                         peer = DRBD_MAX_BIO_SIZE;
 862         }
 863
 864         new = min(local, peer);
 865
 866         if (mdev->state.role == R_PRIMARY && new < now)
 867                 dev_err(DEV, "ASSERT FAILED new < now; (%u < %u)\n", new, now);
 868
 869         if (new != now)
 870                 dev_info(DEV, "max BIO size = %u\n", new);
 871
 872         drbd_setup_queue_param(mdev, new);
 873 }
 874
 875 /* serialize deconfig (worker exiting, doing cleanup)
 876  * and reconfig (drbdsetup disk, drbdsetup net)
 877  *
 878  * Wait for a potentially exiting worker, then restart it,
 879  * or start a new one.  Flush any pending work, there may still be an
 880  * after_state_change queued.
 881  */
 882 static void drbd_reconfig_start(struct drbd_conf *mdev)
 883 {
 884         wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
 885         wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
 886         drbd_thread_start(&mdev->worker);
 887         drbd_flush_workqueue(mdev);
 888 }
 889
 890 /* if still unconfigured, stops worker again.
 891  * if configured now, clears CONFIG_PENDING.
 892  * wakes potential waiters */
 893 static void drbd_reconfig_done(struct drbd_conf *mdev)
 894 {
 895         spin_lock_irq(&mdev->req_lock);
 896         if (mdev->state.disk == D_DISKLESS &&
 897             mdev->state.conn == C_STANDALONE &&
 898             mdev->state.role == R_SECONDARY) {
 899                 set_bit(DEVICE_DYING, &mdev->flags);
 900                 drbd_thread_stop_nowait(&mdev->worker);
 901         } else
 902                 clear_bit(CONFIG_PENDING, &mdev->flags);
 903         spin_unlock_irq(&mdev->req_lock);
 904         wake_up(&mdev->state_wait);
 905 }
 906
 907 /* Make sure IO is suspended before calling this function(). */
 908 static void drbd_suspend_al(struct drbd_conf *mdev)
 909 {
 910         int s = 0;
 911
 912         if (lc_try_lock(mdev->act_log)) {
 913                 drbd_al_shrink(mdev);
 914                 lc_unlock(mdev->act_log);
 915         } else {
 916                 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
 917                 return;
 918         }
 919
 920         spin_lock_irq(&mdev->req_lock);
 921         if (mdev->state.conn < C_CONNECTED)
 922                 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
 923
 924         spin_unlock_irq(&mdev->req_lock);
 925
 926         if (s)
 927                 dev_info(DEV, "Suspended AL updates\n");
 928 }
 929
 930 /* does always return 0;
 931  * interesting return code is in reply->ret_code */
 932 static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
 933                              struct drbd_nl_cfg_reply *reply)
 934 {
 935         enum drbd_ret_code retcode;
 936         enum determine_dev_size dd;
 937         sector_t max_possible_sectors;
 938         sector_t min_md_device_sectors;
 939         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
 940         struct block_device *bdev;
 941         struct lru_cache *resync_lru = NULL;
 942         union drbd_state ns, os;
 943         enum drbd_state_rv rv;
 944         int cp_discovered = 0;
 945         int logical_block_size;
 946
 947         drbd_reconfig_start(mdev);
 948
 949         /* if you want to reconfigure, please tear down first */
 950         if (mdev->state.disk > D_DISKLESS) {
 951                 retcode = ERR_DISK_CONFIGURED;
 952                 goto fail;
 953         }
 954         /* It may just now have detached because of IO error.  Make sure
 955          * drbd_ldev_destroy is done already, we may end up here very fast,
 956          * e.g. if someone calls attach from the on-io-error handler,
 957          * to realize a "hot spare" feature (not that I'd recommend that) */
 958         wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
 959
 960         /* make sure there is no leftover from previous force-detach attempts */
 961         clear_bit(FORCE_DETACH, &mdev->flags);
 962
 963         /* and no leftover from previously aborted resync or verify, either */
 964         mdev->rs_total = 0;
 965         mdev->rs_failed = 0;
 966         atomic_set(&mdev->rs_pending_cnt, 0);
 967
 968         /* allocation not in the IO path, cqueue thread context */
 969         nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
 970         if (!nbc) {
 971                 retcode = ERR_NOMEM;
 972                 goto fail;
 973         }
 974
 975         nbc->dc.disk_size     = DRBD_DISK_SIZE_SECT_DEF;
 976         nbc->dc.on_io_error   = DRBD_ON_IO_ERROR_DEF;
 977         nbc->dc.fencing       = DRBD_FENCING_DEF;
 978         nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
 979
 980         if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
 981                 retcode = ERR_MANDATORY_TAG;
 982                 goto fail;
 983         }
 984
 985         if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
 986                 retcode = ERR_MD_IDX_INVALID;
 987                 goto fail;
 988         }
 989
 990         if (get_net_conf(mdev)) {
 991                 int prot = mdev->net_conf->wire_protocol;
 992                 put_net_conf(mdev);
 993                 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) {
 994                         retcode = ERR_STONITH_AND_PROT_A;
 995                         goto fail;
 996                 }
 997         }
 998
 999         bdev = blkdev_get_by_path(nbc->dc.backing_dev,
1000                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
1001         if (IS_ERR(bdev)) {
1002                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
1003                         PTR_ERR(bdev));
1004                 retcode = ERR_OPEN_DISK;
1005                 goto fail;
1006         }
1007         nbc->backing_bdev = bdev;
1008
1009         /*
1010          * meta_dev_idx >= 0: external fixed size, possibly multiple
1011          * drbd sharing one meta device.  TODO in that case, paranoia
1012          * check that [md_bdev, meta_dev_idx] is not yet used by some
1013          * other drbd minor!  (if you use drbd.conf + drbdadm, that
1014          * should check it for you already; but if you don't, or
1015          * someone fooled it, we need to double check here)
1016          */
1017         bdev = blkdev_get_by_path(nbc->dc.meta_dev,
1018                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1019                                   (nbc->dc.meta_dev_idx < 0) ?
1020                                   (void *)mdev : (void *)drbd_m_holder);
1021         if (IS_ERR(bdev)) {
1022                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
1023                         PTR_ERR(bdev));
1024                 retcode = ERR_OPEN_MD_DISK;
1025                 goto fail;
1026         }
1027         nbc->md_bdev = bdev;
1028
1029         if ((nbc->backing_bdev == nbc->md_bdev) !=
1030             (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1031              nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1032                 retcode = ERR_MD_IDX_INVALID;
1033                 goto fail;
1034         }
1035
1036         resync_lru = lc_create("resync", drbd_bm_ext_cache,
1037                         61, sizeof(struct bm_extent),
1038                         offsetof(struct bm_extent, lce));
1039         if (!resync_lru) {
1040                 retcode = ERR_NOMEM;
1041                 goto fail;
1042         }
1043
1044         /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1045         drbd_md_set_sector_offsets(mdev, nbc);
1046
1047         if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
1048                 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1049                         (unsigned long long) drbd_get_max_capacity(nbc),
1050                         (unsigned long long) nbc->dc.disk_size);
1051                 retcode = ERR_DISK_TOO_SMALL;
1052                 goto fail;
1053         }
1054
1055         if (nbc->dc.meta_dev_idx < 0) {
1056                 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1057                 /* at least one MB, otherwise it does not make sense */
1058                 min_md_device_sectors = (2<<10);
1059         } else {
1060                 max_possible_sectors = DRBD_MAX_SECTORS;
1061                 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
1062         }
1063
1064         if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1065                 retcode = ERR_MD_DISK_TOO_SMALL;
1066                 dev_warn(DEV, "refusing attach: md-device too small, "
1067                      "at least %llu sectors needed for this meta-disk type\n",
1068                      (unsigned long long) min_md_device_sectors);
1069                 goto fail;
1070         }
1071
1072         /* Make sure the new disk is big enough
1073          * (we may currently be R_PRIMARY with no local disk...) */
1074         if (drbd_get_max_capacity(nbc) <
1075             drbd_get_capacity(mdev->this_bdev)) {
1076                 retcode = ERR_DISK_TOO_SMALL;
1077                 goto fail;
1078         }
1079
1080         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1081
1082         if (nbc->known_size > max_possible_sectors) {
1083                 dev_warn(DEV, "==> truncating very big lower level device "
1084                         "to currently maximum possible %llu sectors <==\n",
1085                         (unsigned long long) max_possible_sectors);
1086                 if (nbc->dc.meta_dev_idx >= 0)
1087                         dev_warn(DEV, "==>> using internal or flexible "
1088                                       "meta data may help <<==\n");
1089         }
1090
1091         drbd_suspend_io(mdev);
1092         /* also wait for the last barrier ack. */
1093         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state));
1094         /* and for any other previously queued work */
1095         drbd_flush_workqueue(mdev);
1096
1097         rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1098         retcode = rv;  /* FIXME: Type mismatch. */
1099         drbd_resume_io(mdev);
1100         if (rv < SS_SUCCESS)
1101                 goto fail;
1102
1103         if (!get_ldev_if_state(mdev, D_ATTACHING))
1104                 goto force_diskless;
1105
1106         drbd_md_set_sector_offsets(mdev, nbc);
1107
1108         /* allocate a second IO page if logical_block_size != 512 */
1109         logical_block_size = bdev_logical_block_size(nbc->md_bdev);
1110         if (logical_block_size == 0)
1111                 logical_block_size = MD_SECTOR_SIZE;
1112
1113         if (logical_block_size != MD_SECTOR_SIZE) {
1114                 if (!mdev->md_io_tmpp) {
1115                         struct page *page = alloc_page(GFP_NOIO);
1116                         if (!page)
1117                                 goto force_diskless_dec;
1118
1119                         dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
1120                              logical_block_size, MD_SECTOR_SIZE);
1121                         dev_warn(DEV, "Workaround engaged (has performance impact).\n");
1122
1123                         mdev->md_io_tmpp = page;
1124                 }
1125         }
1126
1127         if (!mdev->bitmap) {
1128                 if (drbd_bm_init(mdev)) {
1129                         retcode = ERR_NOMEM;
1130                         goto force_diskless_dec;
1131                 }
1132         }
1133
1134         retcode = drbd_md_read(mdev, nbc);
1135         if (retcode != NO_ERROR)
1136                 goto force_diskless_dec;
1137
1138         if (mdev->state.conn < C_CONNECTED &&
1139             mdev->state.role == R_PRIMARY &&
1140             (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1141                 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1142                     (unsigned long long)mdev->ed_uuid);
1143                 retcode = ERR_DATA_NOT_CURRENT;
1144                 goto force_diskless_dec;
1145         }
1146
1147         /* Since we are diskless, fix the activity log first... */
1148         if (drbd_check_al_size(mdev)) {
1149                 retcode = ERR_NOMEM;
1150                 goto force_diskless_dec;
1151         }
1152
1153         /* Prevent shrinking of consistent devices ! */
1154         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1155             drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
1156                 dev_warn(DEV, "refusing to truncate a consistent device\n");
1157                 retcode = ERR_DISK_TOO_SMALL;
1158                 goto force_diskless_dec;
1159         }
1160
1161         if (!drbd_al_read_log(mdev, nbc)) {
1162                 retcode = ERR_IO_MD_DISK;
1163                 goto force_diskless_dec;
1164         }
1165
1166         /* Reset the "barriers don't work" bits here, then force meta data to
1167          * be written, to ensure we determine if barriers are supported. */
1168         if (nbc->dc.no_md_flush)
1169                 set_bit(MD_NO_FUA, &mdev->flags);
1170         else
1171                 clear_bit(MD_NO_FUA, &mdev->flags);
1172
1173         /* Point of no return reached.
1174          * Devices and memory are no longer released by error cleanup below.
1175          * now mdev takes over responsibility, and the state engine should
1176          * clean it up somewhere.  */
1177         D_ASSERT(mdev->ldev == NULL);
1178         mdev->ldev = nbc;
1179         mdev->resync = resync_lru;
1180         nbc = NULL;
1181         resync_lru = NULL;
1182
1183         mdev->write_ordering = WO_bdev_flush;
1184         drbd_bump_write_ordering(mdev, WO_bdev_flush);
1185
1186         if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1187                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1188         else
1189                 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1190
1191         if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1192             !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) {
1193                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1194                 cp_discovered = 1;
1195         }
1196
1197         mdev->send_cnt = 0;
1198         mdev->recv_cnt = 0;
1199         mdev->read_cnt = 0;
1200         mdev->writ_cnt = 0;
1201
1202         drbd_reconsider_max_bio_size(mdev);
1203
1204         /* If I am currently not R_PRIMARY,
1205          * but meta data primary indicator is set,
1206          * I just now recover from a hard crash,
1207          * and have been R_PRIMARY before that crash.
1208          *
1209          * Now, if I had no connection before that crash
1210          * (have been degraded R_PRIMARY), chances are that
1211          * I won't find my peer now either.
1212          *
1213          * In that case, and _only_ in that case,
1214          * we use the degr-wfc-timeout instead of the default,
1215          * so we can automatically recover from a crash of a
1216          * degraded but active "cluster" after a certain timeout.
1217          */
1218         clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1219         if (mdev->state.role != R_PRIMARY &&
1220              drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1221             !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1222                 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1223
1224         dd = drbd_determine_dev_size(mdev, 0);
1225         if (dd == dev_size_error) {
1226                 retcode = ERR_NOMEM_BITMAP;
1227                 goto force_diskless_dec;
1228         } else if (dd == grew)
1229                 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1230
1231         if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1232                 dev_info(DEV, "Assuming that all blocks are out of sync "
1233                      "(aka FullSync)\n");
1234                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1235                         "set_n_write from attaching", BM_LOCKED_MASK)) {
1236                         retcode = ERR_IO_MD_DISK;
1237                         goto force_diskless_dec;
1238                 }
1239         } else {
1240                 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1241                         "read from attaching", BM_LOCKED_MASK) < 0) {
1242                         retcode = ERR_IO_MD_DISK;
1243                         goto force_diskless_dec;
1244                 }
1245         }
1246
1247         if (cp_discovered) {
1248                 drbd_al_apply_to_bm(mdev);
1249                 if (drbd_bitmap_io(mdev, &drbd_bm_write,
1250                         "crashed primary apply AL", BM_LOCKED_MASK)) {
1251                         retcode = ERR_IO_MD_DISK;
1252                         goto force_diskless_dec;
1253                 }
1254         }
1255
1256         if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1257                 drbd_suspend_al(mdev); /* IO is still suspended here... */
1258
1259         spin_lock_irq(&mdev->req_lock);
1260         os = mdev->state;
1261         ns.i = os.i;
1262         /* If MDF_CONSISTENT is not set go into inconsistent state,
1263            otherwise investigate MDF_WasUpToDate...
1264            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1265            otherwise into D_CONSISTENT state.
1266         */
1267         if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1268                 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1269                         ns.disk = D_CONSISTENT;
1270                 else
1271                         ns.disk = D_OUTDATED;
1272         } else {
1273                 ns.disk = D_INCONSISTENT;
1274         }
1275
1276         if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1277                 ns.pdsk = D_OUTDATED;
1278
1279         if ( ns.disk == D_CONSISTENT &&
1280             (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1281                 ns.disk = D_UP_TO_DATE;
1282
1283         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1284            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1285            this point, because drbd_request_state() modifies these
1286            flags. */
1287
1288         /* In case we are C_CONNECTED postpone any decision on the new disk
1289            state after the negotiation phase. */
1290         if (mdev->state.conn == C_CONNECTED) {
1291                 mdev->new_state_tmp.i = ns.i;
1292                 ns.i = os.i;
1293                 ns.disk = D_NEGOTIATING;
1294
1295                 /* We expect to receive up-to-date UUIDs soon.
1296                    To avoid a race in receive_state, free p_uuid while
1297                    holding req_lock. I.e. atomic with the state change */
1298                 kfree(mdev->p_uuid);
1299                 mdev->p_uuid = NULL;
1300         }
1301
1302         rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1303         ns = mdev->state;
1304         spin_unlock_irq(&mdev->req_lock);
1305
1306         if (rv < SS_SUCCESS)
1307                 goto force_diskless_dec;
1308
1309         if (mdev->state.role == R_PRIMARY)
1310                 mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1311         else
1312                 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1313
1314         drbd_md_mark_dirty(mdev);
1315         drbd_md_sync(mdev);
1316
1317         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1318         put_ldev(mdev);
1319         reply->ret_code = retcode;
1320         drbd_reconfig_done(mdev);
1321         return 0;
1322
1323  force_diskless_dec:
1324         put_ldev(mdev);
1325  force_diskless:
1326         drbd_force_state(mdev, NS(disk, D_FAILED));
1327         drbd_md_sync(mdev);
1328  fail:
1329         if (nbc) {
1330                 if (nbc->backing_bdev)
1331                         blkdev_put(nbc->backing_bdev,
1332                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1333                 if (nbc->md_bdev)
1334                         blkdev_put(nbc->md_bdev,
1335                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1336                 kfree(nbc);
1337         }
1338         lc_destroy(resync_lru);
1339
1340         reply->ret_code = retcode;
1341         drbd_reconfig_done(mdev);
1342         return 0;
1343 }
1344
1345 /* Detaching the disk is a process in multiple stages.  First we need to lock
1346  * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1347  * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1348  * internal references as well.
1349  * Only then we have finally detached. */
1350 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1351                           struct drbd_nl_cfg_reply *reply)
1352 {
1353         enum drbd_ret_code retcode;
1354         int ret;
1355         struct detach dt = {};
1356
1357         if (!detach_from_tags(mdev, nlp->tag_list, &dt)) {
1358                 reply->ret_code = ERR_MANDATORY_TAG;
1359                 goto out;
1360         }
1361
1362         if (dt.detach_force) {
1363                 set_bit(FORCE_DETACH, &mdev->flags);
1364                 drbd_force_state(mdev, NS(disk, D_FAILED));
1365                 reply->ret_code = SS_SUCCESS;
1366                 goto out;
1367         }
1368
1369         drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1370         drbd_md_get_buffer(mdev); /* make sure there is no in-flight meta-data IO */
1371         retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1372         drbd_md_put_buffer(mdev);
1373         /* D_FAILED will transition to DISKLESS. */
1374         ret = wait_event_interruptible(mdev->misc_wait,
1375                         mdev->state.disk != D_FAILED);
1376         drbd_resume_io(mdev);
1377
1378         if ((int)retcode == (int)SS_IS_DISKLESS)
1379                 retcode = SS_NOTHING_TO_DO;
1380         if (ret)
1381                 retcode = ERR_INTR;
1382         reply->ret_code = retcode;
1383 out:
1384         return 0;
1385 }
1386
1387 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1388                             struct drbd_nl_cfg_reply *reply)
1389 {
1390         int i, ns;
1391         enum drbd_ret_code retcode;
1392         struct net_conf *new_conf = NULL;
1393         struct crypto_hash *tfm = NULL;
1394         struct crypto_hash *integrity_w_tfm = NULL;
1395         struct crypto_hash *integrity_r_tfm = NULL;
1396         struct hlist_head *new_tl_hash = NULL;
1397         struct hlist_head *new_ee_hash = NULL;
1398         struct drbd_conf *odev;
1399         char hmac_name[CRYPTO_MAX_ALG_NAME];
1400         void *int_dig_out = NULL;
1401         void *int_dig_in = NULL;
1402         void *int_dig_vv = NULL;
1403         struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1404
1405         drbd_reconfig_start(mdev);
1406
1407         if (mdev->state.conn > C_STANDALONE) {
1408                 retcode = ERR_NET_CONFIGURED;
1409                 goto fail;
1410         }
1411
1412         /* allocation not in the IO path, cqueue thread context */
1413         new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1414         if (!new_conf) {
1415                 retcode = ERR_NOMEM;
1416                 goto fail;
1417         }
1418
1419         new_conf->timeout          = DRBD_TIMEOUT_DEF;
1420         new_conf->try_connect_int  = DRBD_CONNECT_INT_DEF;
1421         new_conf->ping_int         = DRBD_PING_INT_DEF;
1422         new_conf->max_epoch_size   = DRBD_MAX_EPOCH_SIZE_DEF;
1423         new_conf->max_buffers      = DRBD_MAX_BUFFERS_DEF;
1424         new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1425         new_conf->sndbuf_size      = DRBD_SNDBUF_SIZE_DEF;
1426         new_conf->rcvbuf_size      = DRBD_RCVBUF_SIZE_DEF;
1427         new_conf->ko_count         = DRBD_KO_COUNT_DEF;
1428         new_conf->after_sb_0p      = DRBD_AFTER_SB_0P_DEF;
1429         new_conf->after_sb_1p      = DRBD_AFTER_SB_1P_DEF;
1430         new_conf->after_sb_2p      = DRBD_AFTER_SB_2P_DEF;
1431         new_conf->want_lose        = 0;
1432         new_conf->two_primaries    = 0;
1433         new_conf->wire_protocol    = DRBD_PROT_C;
1434         new_conf->ping_timeo       = DRBD_PING_TIMEO_DEF;
1435         new_conf->rr_conflict      = DRBD_RR_CONFLICT_DEF;
1436         new_conf->on_congestion    = DRBD_ON_CONGESTION_DEF;
1437         new_conf->cong_extents     = DRBD_CONG_EXTENTS_DEF;
1438
1439         if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1440                 retcode = ERR_MANDATORY_TAG;
1441                 goto fail;
1442         }
1443
1444         if (new_conf->two_primaries
1445             && (new_conf->wire_protocol != DRBD_PROT_C)) {
1446                 retcode = ERR_NOT_PROTO_C;
1447                 goto fail;
1448         }
1449
1450         if (get_ldev(mdev)) {
1451                 enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
1452                 put_ldev(mdev);
1453                 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) {
1454                         retcode = ERR_STONITH_AND_PROT_A;
1455                         goto fail;
1456                 }
1457         }
1458
1459         if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A) {
1460                 retcode = ERR_CONG_NOT_PROTO_A;
1461                 goto fail;
1462         }
1463
1464         if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1465                 retcode = ERR_DISCARD;
1466                 goto fail;
1467         }
1468
1469         retcode = NO_ERROR;
1470
1471         new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1472         new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1473         for (i = 0; i < minor_count; i++) {
1474                 odev = minor_to_mdev(i);
1475                 if (!odev || odev == mdev)
1476                         continue;
1477                 if (get_net_conf(odev)) {
1478                         taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1479                         if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1480                             !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1481                                 retcode = ERR_LOCAL_ADDR;
1482
1483                         taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1484                         if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1485                             !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1486                                 retcode = ERR_PEER_ADDR;
1487
1488                         put_net_conf(odev);
1489                         if (retcode != NO_ERROR)
1490                                 goto fail;
1491                 }
1492         }
1493
1494         if (new_conf->cram_hmac_alg[0] != 0) {
1495                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1496                         new_conf->cram_hmac_alg);
1497                 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1498                 if (IS_ERR(tfm)) {
1499                         tfm = NULL;
1500                         retcode = ERR_AUTH_ALG;
1501                         goto fail;
1502                 }
1503
1504                 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
1505                         retcode = ERR_AUTH_ALG_ND;
1506                         goto fail;
1507                 }
1508         }
1509
1510         if (new_conf->integrity_alg[0]) {
1511                 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1512                 if (IS_ERR(integrity_w_tfm)) {
1513                         integrity_w_tfm = NULL;
1514                         retcode=ERR_INTEGRITY_ALG;
1515                         goto fail;
1516                 }
1517
1518                 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1519                         retcode=ERR_INTEGRITY_ALG_ND;
1520                         goto fail;
1521                 }
1522
1523                 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1524                 if (IS_ERR(integrity_r_tfm)) {
1525                         integrity_r_tfm = NULL;
1526                         retcode=ERR_INTEGRITY_ALG;
1527                         goto fail;
1528                 }
1529         }
1530
1531         ns = new_conf->max_epoch_size/8;
1532         if (mdev->tl_hash_s != ns) {
1533                 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1534                 if (!new_tl_hash) {
1535                         retcode = ERR_NOMEM;
1536                         goto fail;
1537                 }
1538         }
1539
1540         ns = new_conf->max_buffers/8;
1541         if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1542                 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1543                 if (!new_ee_hash) {
1544                         retcode = ERR_NOMEM;
1545                         goto fail;
1546                 }
1547         }
1548
1549         ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1550
1551         if (integrity_w_tfm) {
1552                 i = crypto_hash_digestsize(integrity_w_tfm);
1553                 int_dig_out = kmalloc(i, GFP_KERNEL);
1554                 if (!int_dig_out) {
1555                         retcode = ERR_NOMEM;
1556                         goto fail;
1557                 }
1558                 int_dig_in = kmalloc(i, GFP_KERNEL);
1559                 if (!int_dig_in) {
1560                         retcode = ERR_NOMEM;
1561                         goto fail;
1562                 }
1563                 int_dig_vv = kmalloc(i, GFP_KERNEL);
1564                 if (!int_dig_vv) {
1565                         retcode = ERR_NOMEM;
1566                         goto fail;
1567                 }
1568         }
1569
1570         if (!mdev->bitmap) {
1571                 if(drbd_bm_init(mdev)) {
1572                         retcode = ERR_NOMEM;
1573                         goto fail;
1574                 }
1575         }
1576
1577         drbd_flush_workqueue(mdev);
1578         spin_lock_irq(&mdev->req_lock);
1579         if (mdev->net_conf != NULL) {
1580                 retcode = ERR_NET_CONFIGURED;
1581                 spin_unlock_irq(&mdev->req_lock);
1582                 goto fail;
1583         }
1584         mdev->net_conf = new_conf;
1585
1586         mdev->send_cnt = 0;
1587         mdev->recv_cnt = 0;
1588
1589         if (new_tl_hash) {
1590                 kfree(mdev->tl_hash);
1591                 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1592                 mdev->tl_hash = new_tl_hash;
1593         }
1594
1595         if (new_ee_hash) {
1596                 kfree(mdev->ee_hash);
1597                 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1598                 mdev->ee_hash = new_ee_hash;
1599         }
1600
1601         crypto_free_hash(mdev->cram_hmac_tfm);
1602         mdev->cram_hmac_tfm = tfm;
1603
1604         crypto_free_hash(mdev->integrity_w_tfm);
1605         mdev->integrity_w_tfm = integrity_w_tfm;
1606
1607         crypto_free_hash(mdev->integrity_r_tfm);
1608         mdev->integrity_r_tfm = integrity_r_tfm;
1609
1610         kfree(mdev->int_dig_out);
1611         kfree(mdev->int_dig_in);
1612         kfree(mdev->int_dig_vv);
1613         mdev->int_dig_out=int_dig_out;
1614         mdev->int_dig_in=int_dig_in;
1615         mdev->int_dig_vv=int_dig_vv;
1616         retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL);
1617         spin_unlock_irq(&mdev->req_lock);
1618
1619         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1620         reply->ret_code = retcode;
1621         drbd_reconfig_done(mdev);
1622         return 0;
1623
1624 fail:
1625         kfree(int_dig_out);
1626         kfree(int_dig_in);
1627         kfree(int_dig_vv);
1628         crypto_free_hash(tfm);
1629         crypto_free_hash(integrity_w_tfm);
1630         crypto_free_hash(integrity_r_tfm);
1631         kfree(new_tl_hash);
1632         kfree(new_ee_hash);
1633         kfree(new_conf);
1634
1635         reply->ret_code = retcode;
1636         drbd_reconfig_done(mdev);
1637         return 0;
1638 }
1639
1640 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1641                               struct drbd_nl_cfg_reply *reply)
1642 {
1643         int retcode;
1644         struct disconnect dc;
1645
1646         memset(&dc, 0, sizeof(struct disconnect));
1647         if (!disconnect_from_tags(mdev, nlp->tag_list, &dc)) {
1648                 retcode = ERR_MANDATORY_TAG;
1649                 goto fail;
1650         }
1651
1652         if (dc.force) {
1653                 spin_lock_irq(&mdev->req_lock);
1654                 if (mdev->state.conn >= C_WF_CONNECTION)
1655                         _drbd_set_state(_NS(mdev, conn, C_DISCONNECTING), CS_HARD, NULL);
1656                 spin_unlock_irq(&mdev->req_lock);
1657                 goto done;
1658         }
1659
1660         retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1661
1662         if (retcode == SS_NOTHING_TO_DO)
1663                 goto done;
1664         else if (retcode == SS_ALREADY_STANDALONE)
1665                 goto done;
1666         else if (retcode == SS_PRIMARY_NOP) {
1667                 /* Our statche checking code wants to see the peer outdated. */
1668                 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1669                                                       pdsk, D_OUTDATED));
1670         } else if (retcode == SS_CW_FAILED_BY_PEER) {
1671                 /* The peer probably wants to see us outdated. */
1672                 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1673                                                         disk, D_OUTDATED),
1674                                               CS_ORDERED);
1675                 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1676                         drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1677                         retcode = SS_SUCCESS;
1678                 }
1679         }
1680
1681         if (retcode < SS_SUCCESS)
1682                 goto fail;
1683
1684         if (wait_event_interruptible(mdev->state_wait,
1685                                      mdev->state.conn != C_DISCONNECTING)) {
1686                 /* Do not test for mdev->state.conn == C_STANDALONE, since
1687                    someone else might connect us in the mean time! */
1688                 retcode = ERR_INTR;
1689                 goto fail;
1690         }
1691
1692  done:
1693         retcode = NO_ERROR;
1694  fail:
1695         drbd_md_sync(mdev);
1696         reply->ret_code = retcode;
1697         return 0;
1698 }
1699
1700 void resync_after_online_grow(struct drbd_conf *mdev)
1701 {
1702         int iass; /* I am sync source */
1703
1704         dev_info(DEV, "Resync of new storage after online grow\n");
1705         if (mdev->state.role != mdev->state.peer)
1706                 iass = (mdev->state.role == R_PRIMARY);
1707         else
1708                 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1709
1710         if (iass)
1711                 drbd_start_resync(mdev, C_SYNC_SOURCE);
1712         else
1713                 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1714 }
1715
1716 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1717                           struct drbd_nl_cfg_reply *reply)
1718 {
1719         struct resize rs;
1720         int retcode = NO_ERROR;
1721         enum determine_dev_size dd;
1722         enum dds_flags ddsf;
1723
1724         memset(&rs, 0, sizeof(struct resize));
1725         if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1726                 retcode = ERR_MANDATORY_TAG;
1727                 goto fail;
1728         }
1729
1730         if (mdev->state.conn > C_CONNECTED) {
1731                 retcode = ERR_RESIZE_RESYNC;
1732                 goto fail;
1733         }
1734
1735         if (mdev->state.role == R_SECONDARY &&
1736             mdev->state.peer == R_SECONDARY) {
1737                 retcode = ERR_NO_PRIMARY;
1738                 goto fail;
1739         }
1740
1741         if (!get_ldev(mdev)) {
1742                 retcode = ERR_NO_DISK;
1743                 goto fail;
1744         }
1745
1746         if (rs.no_resync && mdev->agreed_pro_version < 93) {
1747                 retcode = ERR_NEED_APV_93;
1748                 goto fail_ldev;
1749         }
1750
1751         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
1752                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
1753
1754         mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
1755         ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
1756         dd = drbd_determine_dev_size(mdev, ddsf);
1757         drbd_md_sync(mdev);
1758         put_ldev(mdev);
1759         if (dd == dev_size_error) {
1760                 retcode = ERR_NOMEM_BITMAP;
1761                 goto fail;
1762         }
1763
1764         if (mdev->state.conn == C_CONNECTED) {
1765                 if (dd == grew)
1766                         set_bit(RESIZE_PENDING, &mdev->flags);
1767
1768                 drbd_send_uuids(mdev);
1769                 drbd_send_sizes(mdev, 1, ddsf);
1770         }
1771
1772  fail:
1773         reply->ret_code = retcode;
1774         return 0;
1775
1776  fail_ldev:
1777         put_ldev(mdev);
1778         goto fail;
1779 }
1780
1781 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1782                                struct drbd_nl_cfg_reply *reply)
1783 {
1784         int retcode = NO_ERROR;
1785         int err;
1786         int ovr; /* online verify running */
1787         int rsr; /* re-sync running */
1788         struct crypto_hash *verify_tfm = NULL;
1789         struct crypto_hash *csums_tfm = NULL;
1790         struct syncer_conf sc;
1791         cpumask_var_t new_cpu_mask;
1792         int *rs_plan_s = NULL;
1793         int fifo_size;
1794
1795         if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1796                 retcode = ERR_NOMEM;
1797                 goto fail;
1798         }
1799
1800         if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1801                 memset(&sc, 0, sizeof(struct syncer_conf));
1802                 sc.rate       = DRBD_RATE_DEF;
1803                 sc.after      = DRBD_AFTER_DEF;
1804                 sc.al_extents = DRBD_AL_EXTENTS_DEF;
1805                 sc.on_no_data  = DRBD_ON_NO_DATA_DEF;
1806                 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF;
1807                 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF;
1808                 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF;
1809                 sc.c_max_rate = DRBD_C_MAX_RATE_DEF;
1810                 sc.c_min_rate = DRBD_C_MIN_RATE_DEF;
1811         } else
1812                 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1813
1814         if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1815                 retcode = ERR_MANDATORY_TAG;
1816                 goto fail;
1817         }
1818
1819         /* re-sync running */
1820         rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1821                 mdev->state.conn == C_SYNC_TARGET ||
1822                 mdev->state.conn == C_PAUSED_SYNC_S ||
1823                 mdev->state.conn == C_PAUSED_SYNC_T );
1824
1825         if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1826                 retcode = ERR_CSUMS_RESYNC_RUNNING;
1827                 goto fail;
1828         }
1829
1830         if (!rsr && sc.csums_alg[0]) {
1831                 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1832                 if (IS_ERR(csums_tfm)) {
1833                         csums_tfm = NULL;
1834                         retcode = ERR_CSUMS_ALG;
1835                         goto fail;
1836                 }
1837
1838                 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1839                         retcode = ERR_CSUMS_ALG_ND;
1840                         goto fail;
1841                 }
1842         }
1843
1844         /* online verify running */
1845         ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1846
1847         if (ovr) {
1848                 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1849                         retcode = ERR_VERIFY_RUNNING;
1850                         goto fail;
1851                 }
1852         }
1853
1854         if (!ovr && sc.verify_alg[0]) {
1855                 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1856                 if (IS_ERR(verify_tfm)) {
1857                         verify_tfm = NULL;
1858                         retcode = ERR_VERIFY_ALG;
1859                         goto fail;
1860                 }
1861
1862                 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1863                         retcode = ERR_VERIFY_ALG_ND;
1864                         goto fail;
1865                 }
1866         }
1867
1868         /* silently ignore cpu mask on UP kernel */
1869         if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1870                 err = bitmap_parse(sc.cpu_mask, 32,
1871                                 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1872                 if (err) {
1873                         dev_warn(DEV, "bitmap_parse() failed with %d\n", err);
1874                         retcode = ERR_CPU_MASK_PARSE;
1875                         goto fail;
1876                 }
1877         }
1878
1879         ERR_IF (sc.rate < 1) sc.rate = 1;
1880         ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
1881 #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1882         if (sc.al_extents > AL_MAX) {
1883                 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1884                 sc.al_extents = AL_MAX;
1885         }
1886 #undef AL_MAX
1887
1888         /* to avoid spurious errors when configuring minors before configuring
1889          * the minors they depend on: if necessary, first create the minor we
1890          * depend on */
1891         if (sc.after >= 0)
1892                 ensure_mdev(sc.after, 1);
1893
1894         /* most sanity checks done, try to assign the new sync-after
1895          * dependency.  need to hold the global lock in there,
1896          * to avoid a race in the dependency loop check. */
1897         retcode = drbd_alter_sa(mdev, sc.after);
1898         if (retcode != NO_ERROR)
1899                 goto fail;
1900
1901         fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1902         if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
1903                 rs_plan_s   = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
1904                 if (!rs_plan_s) {
1905                         dev_err(DEV, "kmalloc of fifo_buffer failed");
1906                         retcode = ERR_NOMEM;
1907                         goto fail;
1908                 }
1909         }
1910
1911         /* ok, assign the rest of it as well.
1912          * lock against receive_SyncParam() */
1913         spin_lock(&mdev->peer_seq_lock);
1914         mdev->sync_conf = sc;
1915
1916         if (!rsr) {
1917                 crypto_free_hash(mdev->csums_tfm);
1918                 mdev->csums_tfm = csums_tfm;
1919                 csums_tfm = NULL;
1920         }
1921
1922         if (!ovr) {
1923                 crypto_free_hash(mdev->verify_tfm);
1924                 mdev->verify_tfm = verify_tfm;
1925                 verify_tfm = NULL;
1926         }
1927
1928         if (fifo_size != mdev->rs_plan_s.size) {
1929                 kfree(mdev->rs_plan_s.values);
1930                 mdev->rs_plan_s.values = rs_plan_s;
1931                 mdev->rs_plan_s.size   = fifo_size;
1932                 mdev->rs_planed = 0;
1933                 rs_plan_s = NULL;
1934         }
1935
1936         spin_unlock(&mdev->peer_seq_lock);
1937
1938         if (get_ldev(mdev)) {
1939                 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1940                 drbd_al_shrink(mdev);
1941                 err = drbd_check_al_size(mdev);
1942                 lc_unlock(mdev->act_log);
1943                 wake_up(&mdev->al_wait);
1944
1945                 put_ldev(mdev);
1946                 drbd_md_sync(mdev);
1947
1948                 if (err) {
1949                         retcode = ERR_NOMEM;
1950                         goto fail;
1951                 }
1952         }
1953
1954         if (mdev->state.conn >= C_CONNECTED)
1955                 drbd_send_sync_param(mdev, &sc);
1956
1957         if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
1958                 cpumask_copy(mdev->cpu_mask, new_cpu_mask);
1959                 drbd_calc_cpu_mask(mdev);
1960                 mdev->receiver.reset_cpu_mask = 1;
1961                 mdev->asender.reset_cpu_mask = 1;
1962                 mdev->worker.reset_cpu_mask = 1;
1963         }
1964
1965         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1966 fail:
1967         kfree(rs_plan_s);
1968         free_cpumask_var(new_cpu_mask);
1969         crypto_free_hash(csums_tfm);
1970         crypto_free_hash(verify_tfm);
1971         reply->ret_code = retcode;
1972         return 0;
1973 }
1974
1975 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1976                               struct drbd_nl_cfg_reply *reply)
1977 {
1978         int retcode;
1979
1980         /* If there is still bitmap IO pending, probably because of a previous
1981          * resync just being finished, wait for it before requesting a new resync.
1982          * Also wait for it's after_state_ch(). */
1983         drbd_suspend_io(mdev);
1984         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
1985         drbd_flush_workqueue(mdev);
1986
1987         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1988
1989         if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1990                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1991
1992         while (retcode == SS_NEED_CONNECTION) {
1993                 spin_lock_irq(&mdev->req_lock);
1994                 if (mdev->state.conn < C_CONNECTED)
1995                         retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1996                 spin_unlock_irq(&mdev->req_lock);
1997
1998                 if (retcode != SS_NEED_CONNECTION)
1999                         break;
2000
2001                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2002         }
2003         drbd_resume_io(mdev);
2004
2005         reply->ret_code = retcode;
2006         return 0;
2007 }
2008
2009 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
2010 {
2011         int rv;
2012
2013         rv = drbd_bmio_set_n_write(mdev);
2014         drbd_suspend_al(mdev);
2015         return rv;
2016 }
2017
2018 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2019                                    struct drbd_nl_cfg_reply *reply)
2020 {
2021         int retcode;
2022
2023         /* If there is still bitmap IO pending, probably because of a previous
2024          * resync just being finished, wait for it before requesting a new resync.
2025          * Also wait for it's after_state_ch(). */
2026         drbd_suspend_io(mdev);
2027         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2028         drbd_flush_workqueue(mdev);
2029
2030         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
2031
2032         if (retcode < SS_SUCCESS) {
2033                 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
2034                         /* The peer will get a resync upon connect anyways. Just make that
2035                            into a full resync. */
2036                         retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
2037                         if (retcode >= SS_SUCCESS) {
2038                                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
2039                                         "set_n_write from invalidate_peer",
2040                                         BM_LOCKED_SET_ALLOWED))
2041                                         retcode = ERR_IO_MD_DISK;
2042                         }
2043                 } else
2044                         retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
2045         }
2046         drbd_resume_io(mdev);
2047
2048         reply->ret_code = retcode;
2049         return 0;
2050 }
2051
2052 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2053                               struct drbd_nl_cfg_reply *reply)
2054 {
2055         int retcode = NO_ERROR;
2056
2057         if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2058                 retcode = ERR_PAUSE_IS_SET;
2059
2060         reply->ret_code = retcode;
2061         return 0;
2062 }
2063
2064 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2065                                struct drbd_nl_cfg_reply *reply)
2066 {
2067         int retcode = NO_ERROR;
2068         union drbd_state s;
2069
2070         if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2071                 s = mdev->state;
2072                 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2073                         retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2074                                   s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2075                 } else {
2076                         retcode = ERR_PAUSE_IS_CLEAR;
2077                 }
2078         }
2079
2080         reply->ret_code = retcode;
2081         return 0;
2082 }
2083
2084 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2085                               struct drbd_nl_cfg_reply *reply)
2086 {
2087         reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
2088
2089         return 0;
2090 }
2091
2092 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2093                              struct drbd_nl_cfg_reply *reply)
2094 {
2095         if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2096                 drbd_uuid_new_current(mdev);
2097                 clear_bit(NEW_CUR_UUID, &mdev->flags);
2098         }
2099         drbd_suspend_io(mdev);
2100         reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2101         if (reply->ret_code == SS_SUCCESS) {
2102                 if (mdev->state.conn < C_CONNECTED)
2103                         tl_clear(mdev);
2104                 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2105                         tl_restart(mdev, fail_frozen_disk_io);
2106         }
2107         drbd_resume_io(mdev);
2108
2109         return 0;
2110 }
2111
2112 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2113                            struct drbd_nl_cfg_reply *reply)
2114 {
2115         reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
2116         return 0;
2117 }
2118
2119 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2120                            struct drbd_nl_cfg_reply *reply)
2121 {
2122         unsigned short *tl;
2123
2124         tl = reply->tag_list;
2125
2126         if (get_ldev(mdev)) {
2127                 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
2128                 put_ldev(mdev);
2129         }
2130
2131         if (get_net_conf(mdev)) {
2132                 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
2133                 put_net_conf(mdev);
2134         }
2135         tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
2136
2137         put_unaligned(TT_END, tl++); /* Close the tag list */
2138
2139         return (int)((char *)tl - (char *)reply->tag_list);
2140 }
2141
2142 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2143                              struct drbd_nl_cfg_reply *reply)
2144 {
2145         unsigned short *tl = reply->tag_list;
2146         union drbd_state s = mdev->state;
2147         unsigned long rs_left;
2148         unsigned int res;
2149
2150         tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
2151
2152         /* no local ref, no bitmap, no syncer progress. */
2153         if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
2154                 if (get_ldev(mdev)) {
2155                         drbd_get_syncer_progress(mdev, &rs_left, &res);
2156                         tl = tl_add_int(tl, T_sync_progress, &res);
2157                         put_ldev(mdev);
2158                 }
2159         }
2160         put_unaligned(TT_END, tl++); /* Close the tag list */
2161
2162         return (int)((char *)tl - (char *)reply->tag_list);
2163 }
2164
2165 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2166                              struct drbd_nl_cfg_reply *reply)
2167 {
2168         unsigned short *tl;
2169
2170         tl = reply->tag_list;
2171
2172         if (get_ldev(mdev)) {
2173                 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
2174                 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
2175                 put_ldev(mdev);
2176         }
2177         put_unaligned(TT_END, tl++); /* Close the tag list */
2178
2179         return (int)((char *)tl - (char *)reply->tag_list);
2180 }
2181
2182 /**
2183  * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
2184  * @mdev:       DRBD device.
2185  * @nlp:        Netlink/connector packet from drbdsetup
2186  * @reply:      Reply packet for drbdsetup
2187  */
2188 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2189                                     struct drbd_nl_cfg_reply *reply)
2190 {
2191         unsigned short *tl;
2192         char rv;
2193
2194         tl = reply->tag_list;
2195
2196         rv = mdev->state.pdsk == D_OUTDATED        ? UT_PEER_OUTDATED :
2197           test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
2198
2199         tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
2200         put_unaligned(TT_END, tl++); /* Close the tag list */
2201
2202         return (int)((char *)tl - (char *)reply->tag_list);
2203 }
2204
2205 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2206                                     struct drbd_nl_cfg_reply *reply)
2207 {
2208         /* default to resume from last known position, if possible */
2209         struct start_ov args =
2210                 { .start_sector = mdev->ov_start_sector };
2211
2212         if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
2213                 reply->ret_code = ERR_MANDATORY_TAG;
2214                 return 0;
2215         }
2216
2217         /* If there is still bitmap IO pending, e.g. previous resync or verify
2218          * just being finished, wait for it before requesting a new resync. */
2219         drbd_suspend_io(mdev);
2220         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2221
2222         /* w_make_ov_request expects position to be aligned */
2223         mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
2224         reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2225         drbd_resume_io(mdev);
2226         return 0;
2227 }
2228
2229
2230 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2231                               struct drbd_nl_cfg_reply *reply)
2232 {
2233         int retcode = NO_ERROR;
2234         int skip_initial_sync = 0;
2235         int err;
2236
2237         struct new_c_uuid args;
2238
2239         memset(&args, 0, sizeof(struct new_c_uuid));
2240         if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
2241                 reply->ret_code = ERR_MANDATORY_TAG;
2242                 return 0;
2243         }
2244
2245         mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
2246
2247         if (!get_ldev(mdev)) {
2248                 retcode = ERR_NO_DISK;
2249                 goto out;
2250         }
2251
2252         /* this is "skip initial sync", assume to be clean */
2253         if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
2254             mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2255                 dev_info(DEV, "Preparing to skip initial sync\n");
2256                 skip_initial_sync = 1;
2257         } else if (mdev->state.conn != C_STANDALONE) {
2258                 retcode = ERR_CONNECTED;
2259                 goto out_dec;
2260         }
2261
2262         drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2263         drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2264
2265         if (args.clear_bm) {
2266                 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
2267                         "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
2268                 if (err) {
2269                         dev_err(DEV, "Writing bitmap failed with %d\n",err);
2270                         retcode = ERR_IO_MD_DISK;
2271                 }
2272                 if (skip_initial_sync) {
2273                         drbd_send_uuids_skip_initial_sync(mdev);
2274                         _drbd_uuid_set(mdev, UI_BITMAP, 0);
2275                         drbd_print_uuids(mdev, "cleared bitmap UUID");
2276                         spin_lock_irq(&mdev->req_lock);
2277                         _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2278                                         CS_VERBOSE, NULL);
2279                         spin_unlock_irq(&mdev->req_lock);
2280                 }
2281         }
2282
2283         drbd_md_sync(mdev);
2284 out_dec:
2285         put_ldev(mdev);
2286 out:
2287         mutex_unlock(&mdev->state_mutex);
2288
2289         reply->ret_code = retcode;
2290         return 0;
2291 }
2292
2293 struct cn_handler_struct {
2294         int (*function)(struct drbd_conf *,
2295                          struct drbd_nl_cfg_req *,
2296                          struct drbd_nl_cfg_reply *);
2297         int reply_body_size;
2298 };
2299
2300 static struct cn_handler_struct cnd_table[] = {
2301         [ P_primary ]           = { &drbd_nl_primary,           0 },
2302         [ P_secondary ]         = { &drbd_nl_secondary,         0 },
2303         [ P_disk_conf ]         = { &drbd_nl_disk_conf,         0 },
2304         [ P_detach ]            = { &drbd_nl_detach,            0 },
2305         [ P_net_conf ]          = { &drbd_nl_net_conf,          0 },
2306         [ P_disconnect ]        = { &drbd_nl_disconnect,        0 },
2307         [ P_resize ]            = { &drbd_nl_resize,            0 },
2308         [ P_syncer_conf ]       = { &drbd_nl_syncer_conf,       0 },
2309         [ P_invalidate ]        = { &drbd_nl_invalidate,        0 },
2310         [ P_invalidate_peer ]   = { &drbd_nl_invalidate_peer,   0 },
2311         [ P_pause_sync ]        = { &drbd_nl_pause_sync,        0 },
2312         [ P_resume_sync ]       = { &drbd_nl_resume_sync,       0 },
2313         [ P_suspend_io ]        = { &drbd_nl_suspend_io,        0 },
2314         [ P_resume_io ]         = { &drbd_nl_resume_io,         0 },
2315         [ P_outdate ]           = { &drbd_nl_outdate,           0 },
2316         [ P_get_config ]        = { &drbd_nl_get_config,
2317                                     sizeof(struct syncer_conf_tag_len_struct) +
2318                                     sizeof(struct disk_conf_tag_len_struct) +
2319                                     sizeof(struct net_conf_tag_len_struct) },
2320         [ P_get_state ]         = { &drbd_nl_get_state,
2321                                     sizeof(struct get_state_tag_len_struct) +
2322                                     sizeof(struct sync_progress_tag_len_struct) },
2323         [ P_get_uuids ]         = { &drbd_nl_get_uuids,
2324                                     sizeof(struct get_uuids_tag_len_struct) },
2325         [ P_get_timeout_flag ]  = { &drbd_nl_get_timeout_flag,
2326                                     sizeof(struct get_timeout_flag_tag_len_struct)},
2327         [ P_start_ov ]          = { &drbd_nl_start_ov,          0 },
2328         [ P_new_c_uuid ]        = { &drbd_nl_new_c_uuid,        0 },
2329 };
2330
2331 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
2332 {
2333         struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2334         struct cn_handler_struct *cm;
2335         struct cn_msg *cn_reply;
2336         struct drbd_nl_cfg_reply *reply;
2337         struct drbd_conf *mdev;
2338         int retcode, rr;
2339         int reply_size = sizeof(struct cn_msg)
2340                 + sizeof(struct drbd_nl_cfg_reply)
2341                 + sizeof(short int);
2342
2343         if (!try_module_get(THIS_MODULE)) {
2344                 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2345                 return;
2346         }
2347
2348         if (!capable(CAP_SYS_ADMIN)) {
2349                 retcode = ERR_PERM;
2350                 goto fail;
2351         }
2352
2353         mdev = ensure_mdev(nlp->drbd_minor,
2354                         (nlp->flags & DRBD_NL_CREATE_DEVICE));
2355         if (!mdev) {
2356                 retcode = ERR_MINOR_INVALID;
2357                 goto fail;
2358         }
2359
2360         if (nlp->packet_type >= P_nl_after_last_packet ||
2361             nlp->packet_type == P_return_code_only) {
2362                 retcode = ERR_PACKET_NR;
2363                 goto fail;
2364         }
2365
2366         cm = cnd_table + nlp->packet_type;
2367
2368         /* This may happen if packet number is 0: */
2369         if (cm->function == NULL) {
2370                 retcode = ERR_PACKET_NR;
2371                 goto fail;
2372         }
2373
2374         reply_size += cm->reply_body_size;
2375
2376         /* allocation not in the IO path, cqueue thread context */
2377         cn_reply = kzalloc(reply_size, GFP_KERNEL);
2378         if (!cn_reply) {
2379                 retcode = ERR_NOMEM;
2380                 goto fail;
2381         }
2382         reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2383
2384         reply->packet_type =
2385                 cm->reply_body_size ? nlp->packet_type : P_return_code_only;
2386         reply->minor = nlp->drbd_minor;
2387         reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2388         /* reply->tag_list; might be modified by cm->function. */
2389
2390         rr = cm->function(mdev, nlp, reply);
2391
2392         cn_reply->id = req->id;
2393         cn_reply->seq = req->seq;
2394         cn_reply->ack = req->ack  + 1;
2395         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2396         cn_reply->flags = 0;
2397
2398         rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2399         if (rr && rr != -ESRCH)
2400                 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2401
2402         kfree(cn_reply);
2403         module_put(THIS_MODULE);
2404         return;
2405  fail:
2406         drbd_nl_send_reply(req, retcode);
2407         module_put(THIS_MODULE);
2408 }
2409
2410 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2411
2412 static unsigned short *
2413 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2414         unsigned short len, int nul_terminated)
2415 {
2416         unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2417         len = (len < l) ? len :  l;
2418         put_unaligned(tag, tl++);
2419         put_unaligned(len, tl++);
2420         memcpy(tl, data, len);
2421         tl = (unsigned short*)((char*)tl + len);
2422         if (nul_terminated)
2423                 *((char*)tl - 1) = 0;
2424         return tl;
2425 }
2426
2427 static unsigned short *
2428 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2429 {
2430         return __tl_add_blob(tl, tag, data, len, 0);
2431 }
2432
2433 static unsigned short *
2434 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2435 {
2436         return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2437 }
2438
2439 static unsigned short *
2440 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2441 {
2442         put_unaligned(tag, tl++);
2443         switch(tag_type(tag)) {
2444         case TT_INTEGER:
2445                 put_unaligned(sizeof(int), tl++);
2446                 put_unaligned(*(int *)val, (int *)tl);
2447                 tl = (unsigned short*)((char*)tl+sizeof(int));
2448                 break;
2449         case TT_INT64:
2450                 put_unaligned(sizeof(u64), tl++);
2451                 put_unaligned(*(u64 *)val, (u64 *)tl);
2452                 tl = (unsigned short*)((char*)tl+sizeof(u64));
2453                 break;
2454         default:
2455                 /* someone did something stupid. */
2456                 ;
2457         }
2458         return tl;
2459 }
2460
2461 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2462 {
2463         char buffer[sizeof(struct cn_msg)+
2464                     sizeof(struct drbd_nl_cfg_reply)+
2465                     sizeof(struct get_state_tag_len_struct)+
2466                     sizeof(short int)];
2467         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2468         struct drbd_nl_cfg_reply *reply =
2469                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2470         unsigned short *tl = reply->tag_list;
2471
2472         /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2473
2474         tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2475
2476         put_unaligned(TT_END, tl++); /* Close the tag list */
2477
2478         cn_reply->id.idx = CN_IDX_DRBD;
2479         cn_reply->id.val = CN_VAL_DRBD;
2480
2481         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2482         cn_reply->ack = 0; /* not used here. */
2483         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2484                 (int)((char *)tl - (char *)reply->tag_list);
2485         cn_reply->flags = 0;
2486
2487         reply->packet_type = P_get_state;
2488         reply->minor = mdev_to_minor(mdev);
2489         reply->ret_code = NO_ERROR;
2490
2491         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2492 }
2493
2494 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2495 {
2496         char buffer[sizeof(struct cn_msg)+
2497                     sizeof(struct drbd_nl_cfg_reply)+
2498                     sizeof(struct call_helper_tag_len_struct)+
2499                     sizeof(short int)];
2500         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2501         struct drbd_nl_cfg_reply *reply =
2502                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2503         unsigned short *tl = reply->tag_list;
2504
2505         /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2506
2507         tl = tl_add_str(tl, T_helper, helper_name);
2508         put_unaligned(TT_END, tl++); /* Close the tag list */
2509
2510         cn_reply->id.idx = CN_IDX_DRBD;
2511         cn_reply->id.val = CN_VAL_DRBD;
2512
2513         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2514         cn_reply->ack = 0; /* not used here. */
2515         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2516                 (int)((char *)tl - (char *)reply->tag_list);
2517         cn_reply->flags = 0;
2518
2519         reply->packet_type = P_call_helper;
2520         reply->minor = mdev_to_minor(mdev);
2521         reply->ret_code = NO_ERROR;
2522
2523         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2524 }
2525
2526 void drbd_bcast_ee(struct drbd_conf *mdev,
2527                 const char *reason, const int dgs,
2528                 const char* seen_hash, const char* calc_hash,
2529                 const struct drbd_epoch_entry* e)
2530 {
2531         struct cn_msg *cn_reply;
2532         struct drbd_nl_cfg_reply *reply;
2533         unsigned short *tl;
2534         struct page *page;
2535         unsigned len;
2536
2537         if (!e)
2538                 return;
2539         if (!reason || !reason[0])
2540                 return;
2541
2542         /* apparently we have to memcpy twice, first to prepare the data for the
2543          * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2544          * netlink skb. */
2545         /* receiver thread context, which is not in the writeout path (of this node),
2546          * but may be in the writeout path of the _other_ node.
2547          * GFP_NOIO to avoid potential "distributed deadlock". */
2548         cn_reply = kzalloc(
2549                 sizeof(struct cn_msg)+
2550                 sizeof(struct drbd_nl_cfg_reply)+
2551                 sizeof(struct dump_ee_tag_len_struct)+
2552                 sizeof(short int),
2553                 GFP_NOIO);
2554
2555         if (!cn_reply) {
2556                 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2557                                 (unsigned long long)e->sector, e->size);
2558                 return;
2559         }
2560
2561         reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2562         tl = reply->tag_list;
2563
2564         tl = tl_add_str(tl, T_dump_ee_reason, reason);
2565         tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2566         tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2567         tl = tl_add_int(tl, T_ee_sector, &e->sector);
2568         tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2569
2570         /* dump the first 32k */
2571         len = min_t(unsigned, e->size, 32 << 10);
2572         put_unaligned(T_ee_data, tl++);
2573         put_unaligned(len, tl++);
2574
2575         page = e->pages;
2576         page_chain_for_each(page) {
2577                 void *d = kmap_atomic(page);
2578                 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2579                 memcpy(tl, d, l);
2580                 kunmap_atomic(d);
2581                 tl = (unsigned short*)((char*)tl + l);
2582                 len -= l;
2583                 if (len == 0)
2584                         break;
2585         }
2586         put_unaligned(TT_END, tl++); /* Close the tag list */
2587
2588         cn_reply->id.idx = CN_IDX_DRBD;
2589         cn_reply->id.val = CN_VAL_DRBD;
2590
2591         cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2592         cn_reply->ack = 0; // not used here.
2593         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2594                 (int)((char*)tl - (char*)reply->tag_list);
2595         cn_reply->flags = 0;
2596
2597         reply->packet_type = P_dump_ee;
2598         reply->minor = mdev_to_minor(mdev);
2599         reply->ret_code = NO_ERROR;
2600
2601         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2602         kfree(cn_reply);
2603 }
2604
2605 void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2606 {
2607         char buffer[sizeof(struct cn_msg)+
2608                     sizeof(struct drbd_nl_cfg_reply)+
2609                     sizeof(struct sync_progress_tag_len_struct)+
2610                     sizeof(short int)];
2611         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2612         struct drbd_nl_cfg_reply *reply =
2613                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2614         unsigned short *tl = reply->tag_list;
2615         unsigned long rs_left;
2616         unsigned int res;
2617
2618         /* no local ref, no bitmap, no syncer progress, no broadcast. */
2619         if (!get_ldev(mdev))
2620                 return;
2621         drbd_get_syncer_progress(mdev, &rs_left, &res);
2622         put_ldev(mdev);
2623
2624         tl = tl_add_int(tl, T_sync_progress, &res);
2625         put_unaligned(TT_END, tl++); /* Close the tag list */
2626
2627         cn_reply->id.idx = CN_IDX_DRBD;
2628         cn_reply->id.val = CN_VAL_DRBD;
2629
2630         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2631         cn_reply->ack = 0; /* not used here. */
2632         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2633                 (int)((char *)tl - (char *)reply->tag_list);
2634         cn_reply->flags = 0;
2635
2636         reply->packet_type = P_sync_progress;
2637         reply->minor = mdev_to_minor(mdev);
2638         reply->ret_code = NO_ERROR;
2639
2640         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2641 }
2642
2643 int __init drbd_nl_init(void)
2644 {
2645         static struct cb_id cn_id_drbd;
2646         int err, try=10;
2647
2648         cn_id_drbd.val = CN_VAL_DRBD;
2649         do {
2650                 cn_id_drbd.idx = cn_idx;
2651                 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2652                 if (!err)
2653                         break;
2654                 cn_idx = (cn_idx + CN_IDX_STEP);
2655         } while (try--);
2656
2657         if (err) {
2658                 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2659                 return err;
2660         }
2661
2662         return 0;
2663 }
2664
2665 void drbd_nl_cleanup(void)
2666 {
2667         static struct cb_id cn_id_drbd;
2668
2669         cn_id_drbd.idx = cn_idx;
2670         cn_id_drbd.val = CN_VAL_DRBD;
2671
2672         cn_del_callback(&cn_id_drbd);
2673 }
2674
2675 void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2676 {
2677         char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2678         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2679         struct drbd_nl_cfg_reply *reply =
2680                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2681         int rr;
2682
2683         memset(buffer, 0, sizeof(buffer));
2684         cn_reply->id = req->id;
2685
2686         cn_reply->seq = req->seq;
2687         cn_reply->ack = req->ack  + 1;
2688         cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2689         cn_reply->flags = 0;
2690
2691         reply->packet_type = P_return_code_only;
2692         reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2693         reply->ret_code = ret_code;
2694
2695         rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2696         if (rr && rr != -ESRCH)
2697                 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2698 }
2699