drivers/block/drbd/drbd_nl.c

   1 /*
   2    drbd_nl.c
   3
   4    This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
   5
   6    Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
   7    Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
   8    Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
   9
  10    drbd is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2, or (at your option)
  13    any later version.
  14
  15    drbd is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with drbd; see the file COPYING.  If not, write to
  22    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/drbd.h>
  28 #include <linux/in.h>
  29 #include <linux/fs.h>
  30 #include <linux/file.h>
  31 #include <linux/slab.h>
  32 #include <linux/connector.h>
  33 #include <linux/blkpg.h>
  34 #include <linux/cpumask.h>
  35 #include "drbd_int.h"
  36 #include "drbd_req.h"
  37 #include "drbd_wrappers.h"
  38 #include <asm/unaligned.h>
  39 #include <linux/drbd_tag_magic.h>
  40 #include <linux/drbd_limits.h>
  41 #include <linux/compiler.h>
  42 #include <linux/kthread.h>
  43
  44 static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int);
  45 static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *);
  46 static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *);
  47
  48 /* see get_sb_bdev and bd_claim */
  49 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
  50
  51 /* Generate the tag_list to struct functions */
  52 #define NL_PACKET(name, number, fields) \
  53 static int name ## _from_tags(struct drbd_conf *mdev, \
  54         unsigned short *tags, struct name *arg) __attribute__ ((unused)); \
  55 static int name ## _from_tags(struct drbd_conf *mdev, \
  56         unsigned short *tags, struct name *arg) \
  57 { \
  58         int tag; \
  59         int dlen; \
  60         \
  61         while ((tag = get_unaligned(tags++)) != TT_END) {       \
  62                 dlen = get_unaligned(tags++);                   \
  63                 switch (tag_number(tag)) { \
  64                 fields \
  65                 default: \
  66                         if (tag & T_MANDATORY) { \
  67                                 dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \
  68                                 return 0; \
  69                         } \
  70                 } \
  71                 tags = (unsigned short *)((char *)tags + dlen); \
  72         } \
  73         return 1; \
  74 }
  75 #define NL_INTEGER(pn, pr, member) \
  76         case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \
  77                 arg->member = get_unaligned((int *)(tags));     \
  78                 break;
  79 #define NL_INT64(pn, pr, member) \
  80         case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \
  81                 arg->member = get_unaligned((u64 *)(tags));     \
  82                 break;
  83 #define NL_BIT(pn, pr, member) \
  84         case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \
  85                 arg->member = *(char *)(tags) ? 1 : 0; \
  86                 break;
  87 #define NL_STRING(pn, pr, member, len) \
  88         case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \
  89                 if (dlen > len) { \
  90                         dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \
  91                                 #member, dlen, (unsigned int)len); \
  92                         return 0; \
  93                 } \
  94                  arg->member ## _len = dlen; \
  95                  memcpy(arg->member, tags, min_t(size_t, dlen, len)); \
  96                  break;
  97 #include "linux/drbd_nl.h"
  98
  99 /* Generate the struct to tag_list functions */
 100 #define NL_PACKET(name, number, fields) \
 101 static unsigned short* \
 102 name ## _to_tags(struct drbd_conf *mdev, \
 103         struct name *arg, unsigned short *tags) __attribute__ ((unused)); \
 104 static unsigned short* \
 105 name ## _to_tags(struct drbd_conf *mdev, \
 106         struct name *arg, unsigned short *tags) \
 107 { \
 108         fields \
 109         return tags; \
 110 }
 111
 112 #define NL_INTEGER(pn, pr, member) \
 113         put_unaligned(pn | pr | TT_INTEGER, tags++);    \
 114         put_unaligned(sizeof(int), tags++);             \
 115         put_unaligned(arg->member, (int *)tags);        \
 116         tags = (unsigned short *)((char *)tags+sizeof(int));
 117 #define NL_INT64(pn, pr, member) \
 118         put_unaligned(pn | pr | TT_INT64, tags++);      \
 119         put_unaligned(sizeof(u64), tags++);             \
 120         put_unaligned(arg->member, (u64 *)tags);        \
 121         tags = (unsigned short *)((char *)tags+sizeof(u64));
 122 #define NL_BIT(pn, pr, member) \
 123         put_unaligned(pn | pr | TT_BIT, tags++);        \
 124         put_unaligned(sizeof(char), tags++);            \
 125         *(char *)tags = arg->member; \
 126         tags = (unsigned short *)((char *)tags+sizeof(char));
 127 #define NL_STRING(pn, pr, member, len) \
 128         put_unaligned(pn | pr | TT_STRING, tags++);     \
 129         put_unaligned(arg->member ## _len, tags++);     \
 130         memcpy(tags, arg->member, arg->member ## _len); \
 131         tags = (unsigned short *)((char *)tags + arg->member ## _len);
 132 #include "linux/drbd_nl.h"
 133
 134 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name);
 135 void drbd_nl_send_reply(struct cn_msg *, int);
 136
 137 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
 138 {
 139         char *envp[] = { "HOME=/",
 140                         "TERM=linux",
 141                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 142                         NULL, /* Will be set to address family */
 143                         NULL, /* Will be set to address */
 144                         NULL };
 145
 146         char mb[12], af[20], ad[60], *afs;
 147         char *argv[] = {usermode_helper, cmd, mb, NULL };
 148         int ret;
 149
 150         snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
 151
 152         if (get_net_conf(mdev)) {
 153                 switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) {
 154                 case AF_INET6:
 155                         afs = "ipv6";
 156                         snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6",
 157                                  &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr);
 158                         break;
 159                 case AF_INET:
 160                         afs = "ipv4";
 161                         snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
 162                                  &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
 163                         break;
 164                 default:
 165                         afs = "ssocks";
 166                         snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
 167                                  &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
 168                 }
 169                 snprintf(af, 20, "DRBD_PEER_AF=%s", afs);
 170                 envp[3]=af;
 171                 envp[4]=ad;
 172                 put_net_conf(mdev);
 173         }
 174
 175         /* The helper may take some time.
 176          * write out any unsynced meta data changes now */
 177         drbd_md_sync(mdev);
 178
 179         dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
 180
 181         drbd_bcast_ev_helper(mdev, cmd);
 182         ret = call_usermodehelper(usermode_helper, argv, envp, 1);
 183         if (ret)
 184                 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 185                                 usermode_helper, cmd, mb,
 186                                 (ret >> 8) & 0xff, ret);
 187         else
 188                 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 189                                 usermode_helper, cmd, mb,
 190                                 (ret >> 8) & 0xff, ret);
 191
 192         if (ret < 0) /* Ignore any ERRNOs we got. */
 193                 ret = 0;
 194
 195         return ret;
 196 }
 197
 198 enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
 199 {
 200         char *ex_to_string;
 201         int r;
 202         enum drbd_disk_state nps;
 203         enum drbd_fencing_p fp;
 204
 205         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 206
 207         if (get_ldev_if_state(mdev, D_CONSISTENT)) {
 208                 fp = mdev->ldev->dc.fencing;
 209                 put_ldev(mdev);
 210         } else {
 211                 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
 212                 nps = mdev->state.pdsk;
 213                 goto out;
 214         }
 215
 216         r = drbd_khelper(mdev, "fence-peer");
 217
 218         switch ((r>>8) & 0xff) {
 219         case 3: /* peer is inconsistent */
 220                 ex_to_string = "peer is inconsistent or worse";
 221                 nps = D_INCONSISTENT;
 222                 break;
 223         case 4: /* peer got outdated, or was already outdated */
 224                 ex_to_string = "peer was fenced";
 225                 nps = D_OUTDATED;
 226                 break;
 227         case 5: /* peer was down */
 228                 if (mdev->state.disk == D_UP_TO_DATE) {
 229                         /* we will(have) create(d) a new UUID anyways... */
 230                         ex_to_string = "peer is unreachable, assumed to be dead";
 231                         nps = D_OUTDATED;
 232                 } else {
 233                         ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
 234                         nps = mdev->state.pdsk;
 235                 }
 236                 break;
 237         case 6: /* Peer is primary, voluntarily outdate myself.
 238                  * This is useful when an unconnected R_SECONDARY is asked to
 239                  * become R_PRIMARY, but finds the other peer being active. */
 240                 ex_to_string = "peer is active";
 241                 dev_warn(DEV, "Peer is primary, outdating myself.\n");
 242                 nps = D_UNKNOWN;
 243                 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
 244                 break;
 245         case 7:
 246                 if (fp != FP_STONITH)
 247                         dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
 248                 ex_to_string = "peer was stonithed";
 249                 nps = D_OUTDATED;
 250                 break;
 251         default:
 252                 /* The script is broken ... */
 253                 nps = D_UNKNOWN;
 254                 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
 255                 return nps;
 256         }
 257
 258         dev_info(DEV, "fence-peer helper returned %d (%s)\n",
 259                         (r>>8) & 0xff, ex_to_string);
 260
 261 out:
 262         if (mdev->state.susp_fen && nps >= D_UNKNOWN) {
 263                 /* The handler was not successful... unfreeze here, the
 264                    state engine can not unfreeze... */
 265                 _drbd_request_state(mdev, NS(susp_fen, 0), CS_VERBOSE);
 266         }
 267
 268         return nps;
 269 }
 270
 271 static int _try_outdate_peer_async(void *data)
 272 {
 273         struct drbd_conf *mdev = (struct drbd_conf *)data;
 274         enum drbd_disk_state nps;
 275
 276         nps = drbd_try_outdate_peer(mdev);
 277         drbd_request_state(mdev, NS(pdsk, nps));
 278
 279         return 0;
 280 }
 281
 282 void drbd_try_outdate_peer_async(struct drbd_conf *mdev)
 283 {
 284         struct task_struct *opa;
 285
 286         opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev));
 287         if (IS_ERR(opa))
 288                 dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n");
 289 }
 290
 291 int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
 292 {
 293         const int max_tries = 4;
 294         int r = 0;
 295         int try = 0;
 296         int forced = 0;
 297         union drbd_state mask, val;
 298         enum drbd_disk_state nps;
 299
 300         if (new_role == R_PRIMARY)
 301                 request_ping(mdev); /* Detect a dead peer ASAP */
 302
 303         mutex_lock(&mdev->state_mutex);
 304
 305         mask.i = 0; mask.role = R_MASK;
 306         val.i  = 0; val.role  = new_role;
 307
 308         while (try++ < max_tries) {
 309                 r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
 310
 311                 /* in case we first succeeded to outdate,
 312                  * but now suddenly could establish a connection */
 313                 if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
 314                         val.pdsk = 0;
 315                         mask.pdsk = 0;
 316                         continue;
 317                 }
 318
 319                 if (r == SS_NO_UP_TO_DATE_DISK && force &&
 320                     (mdev->state.disk < D_UP_TO_DATE &&
 321                      mdev->state.disk >= D_INCONSISTENT)) {
 322                         mask.disk = D_MASK;
 323                         val.disk  = D_UP_TO_DATE;
 324                         forced = 1;
 325                         continue;
 326                 }
 327
 328                 if (r == SS_NO_UP_TO_DATE_DISK &&
 329                     mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
 330                         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 331                         nps = drbd_try_outdate_peer(mdev);
 332
 333                         if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
 334                                 val.disk = D_UP_TO_DATE;
 335                                 mask.disk = D_MASK;
 336                         }
 337
 338                         val.pdsk = nps;
 339                         mask.pdsk = D_MASK;
 340
 341                         continue;
 342                 }
 343
 344                 if (r == SS_NOTHING_TO_DO)
 345                         goto fail;
 346                 if (r == SS_PRIMARY_NOP && mask.pdsk == 0) {
 347                         nps = drbd_try_outdate_peer(mdev);
 348
 349                         if (force && nps > D_OUTDATED) {
 350                                 dev_warn(DEV, "Forced into split brain situation!\n");
 351                                 nps = D_OUTDATED;
 352                         }
 353
 354                         mask.pdsk = D_MASK;
 355                         val.pdsk  = nps;
 356
 357                         continue;
 358                 }
 359                 if (r == SS_TWO_PRIMARIES) {
 360                         /* Maybe the peer is detected as dead very soon...
 361                            retry at most once more in this case. */
 362                         __set_current_state(TASK_INTERRUPTIBLE);
 363                         schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10);
 364                         if (try < max_tries)
 365                                 try = max_tries - 1;
 366                         continue;
 367                 }
 368                 if (r < SS_SUCCESS) {
 369                         r = _drbd_request_state(mdev, mask, val,
 370                                                 CS_VERBOSE + CS_WAIT_COMPLETE);
 371                         if (r < SS_SUCCESS)
 372                                 goto fail;
 373                 }
 374                 break;
 375         }
 376
 377         if (r < SS_SUCCESS)
 378                 goto fail;
 379
 380         if (forced)
 381                 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
 382
 383         /* Wait until nothing is on the fly :) */
 384         wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
 385
 386         if (new_role == R_SECONDARY) {
 387                 set_disk_ro(mdev->vdisk, TRUE);
 388                 if (get_ldev(mdev)) {
 389                         mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
 390                         put_ldev(mdev);
 391                 }
 392         } else {
 393                 if (get_net_conf(mdev)) {
 394                         mdev->net_conf->want_lose = 0;
 395                         put_net_conf(mdev);
 396                 }
 397                 set_disk_ro(mdev->vdisk, FALSE);
 398                 if (get_ldev(mdev)) {
 399                         if (((mdev->state.conn < C_CONNECTED ||
 400                                mdev->state.pdsk <= D_FAILED)
 401                               && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
 402                                 drbd_uuid_new_current(mdev);
 403
 404                         mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
 405                         put_ldev(mdev);
 406                 }
 407         }
 408
 409         if ((new_role == R_SECONDARY) && get_ldev(mdev)) {
 410                 drbd_al_to_on_disk_bm(mdev);
 411                 put_ldev(mdev);
 412         }
 413
 414         if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
 415                 /* if this was forced, we should consider sync */
 416                 if (forced)
 417                         drbd_send_uuids(mdev);
 418                 drbd_send_state(mdev);
 419         }
 420
 421         drbd_md_sync(mdev);
 422
 423         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
 424  fail:
 425         mutex_unlock(&mdev->state_mutex);
 426         return r;
 427 }
 428
 429 static struct drbd_conf *ensure_mdev(int minor, int create)
 430 {
 431         struct drbd_conf *mdev;
 432
 433         if (minor >= minor_count)
 434                 return NULL;
 435
 436         mdev = minor_to_mdev(minor);
 437
 438         if (!mdev && create) {
 439                 struct gendisk *disk = NULL;
 440                 mdev = drbd_new_device(minor);
 441
 442                 spin_lock_irq(&drbd_pp_lock);
 443                 if (minor_table[minor] == NULL) {
 444                         minor_table[minor] = mdev;
 445                         disk = mdev->vdisk;
 446                         mdev = NULL;
 447                 } /* else: we lost the race */
 448                 spin_unlock_irq(&drbd_pp_lock);
 449
 450                 if (disk) /* we won the race above */
 451                         /* in case we ever add a drbd_delete_device(),
 452                          * don't forget the del_gendisk! */
 453                         add_disk(disk);
 454                 else /* we lost the race above */
 455                         drbd_free_mdev(mdev);
 456
 457                 mdev = minor_to_mdev(minor);
 458         }
 459
 460         return mdev;
 461 }
 462
 463 static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
 464                            struct drbd_nl_cfg_reply *reply)
 465 {
 466         struct primary primary_args;
 467
 468         memset(&primary_args, 0, sizeof(struct primary));
 469         if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
 470                 reply->ret_code = ERR_MANDATORY_TAG;
 471                 return 0;
 472         }
 473
 474         reply->ret_code =
 475                 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force);
 476
 477         return 0;
 478 }
 479
 480 static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
 481                              struct drbd_nl_cfg_reply *reply)
 482 {
 483         reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
 484
 485         return 0;
 486 }
 487
 488 /* initializes the md.*_offset members, so we are able to find
 489  * the on disk meta data */
 490 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
 491                                        struct drbd_backing_dev *bdev)
 492 {
 493         sector_t md_size_sect = 0;
 494         switch (bdev->dc.meta_dev_idx) {
 495         default:
 496                 /* v07 style fixed size indexed meta data */
 497                 bdev->md.md_size_sect = MD_RESERVED_SECT;
 498                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 499                 bdev->md.al_offset = MD_AL_OFFSET;
 500                 bdev->md.bm_offset = MD_BM_OFFSET;
 501                 break;
 502         case DRBD_MD_INDEX_FLEX_EXT:
 503                 /* just occupy the full device; unit: sectors */
 504                 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
 505                 bdev->md.md_offset = 0;
 506                 bdev->md.al_offset = MD_AL_OFFSET;
 507                 bdev->md.bm_offset = MD_BM_OFFSET;
 508                 break;
 509         case DRBD_MD_INDEX_INTERNAL:
 510         case DRBD_MD_INDEX_FLEX_INT:
 511                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 512                 /* al size is still fixed */
 513                 bdev->md.al_offset = -MD_AL_MAX_SIZE;
 514                 /* we need (slightly less than) ~ this much bitmap sectors: */
 515                 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
 516                 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
 517                 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
 518                 md_size_sect = ALIGN(md_size_sect, 8);
 519
 520                 /* plus the "drbd meta data super block",
 521                  * and the activity log; */
 522                 md_size_sect += MD_BM_OFFSET;
 523
 524                 bdev->md.md_size_sect = md_size_sect;
 525                 /* bitmap offset is adjusted by 'super' block size */
 526                 bdev->md.bm_offset   = -md_size_sect + MD_AL_OFFSET;
 527                 break;
 528         }
 529 }
 530
 531 char *ppsize(char *buf, unsigned long long size)
 532 {
 533         /* Needs 9 bytes at max. */
 534         static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
 535         int base = 0;
 536         while (size >= 10000) {
 537                 /* shift + round */
 538                 size = (size >> 10) + !!(size & (1<<9));
 539                 base++;
 540         }
 541         sprintf(buf, "%lu %cB", (long)size, units[base]);
 542
 543         return buf;
 544 }
 545
 546 /* there is still a theoretical deadlock when called from receiver
 547  * on an D_INCONSISTENT R_PRIMARY:
 548  *  remote READ does inc_ap_bio, receiver would need to receive answer
 549  *  packet from remote to dec_ap_bio again.
 550  *  receiver receive_sizes(), comes here,
 551  *  waits for ap_bio_cnt == 0. -> deadlock.
 552  * but this cannot happen, actually, because:
 553  *  R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
 554  *  (not connected, or bad/no disk on peer):
 555  *  see drbd_fail_request_early, ap_bio_cnt is zero.
 556  *  R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
 557  *  peer may not initiate a resize.
 558  */
 559 void drbd_suspend_io(struct drbd_conf *mdev)
 560 {
 561         set_bit(SUSPEND_IO, &mdev->flags);
 562         if (is_susp(mdev->state))
 563                 return;
 564         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
 565 }
 566
 567 void drbd_resume_io(struct drbd_conf *mdev)
 568 {
 569         clear_bit(SUSPEND_IO, &mdev->flags);
 570         wake_up(&mdev->misc_wait);
 571 }
 572
 573 /**
 574  * drbd_determine_dev_size() -  Sets the right device size obeying all constraints
 575  * @mdev:       DRBD device.
 576  *
 577  * Returns 0 on success, negative return values indicate errors.
 578  * You should call drbd_md_sync() after calling this function.
 579  */
 580 enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
 581 {
 582         sector_t prev_first_sect, prev_size; /* previous meta location */
 583         sector_t la_size;
 584         sector_t size;
 585         char ppb[10];
 586
 587         int md_moved, la_size_changed;
 588         enum determine_dev_size rv = unchanged;
 589
 590         /* race:
 591          * application request passes inc_ap_bio,
 592          * but then cannot get an AL-reference.
 593          * this function later may wait on ap_bio_cnt == 0. -> deadlock.
 594          *
 595          * to avoid that:
 596          * Suspend IO right here.
 597          * still lock the act_log to not trigger ASSERTs there.
 598          */
 599         drbd_suspend_io(mdev);
 600
 601         /* no wait necessary anymore, actually we could assert that */
 602         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
 603
 604         prev_first_sect = drbd_md_first_sector(mdev->ldev);
 605         prev_size = mdev->ldev->md.md_size_sect;
 606         la_size = mdev->ldev->md.la_size_sect;
 607
 608         /* TODO: should only be some assert here, not (re)init... */
 609         drbd_md_set_sector_offsets(mdev, mdev->ldev);
 610
 611         size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED);
 612
 613         if (drbd_get_capacity(mdev->this_bdev) != size ||
 614             drbd_bm_capacity(mdev) != size) {
 615                 int err;
 616                 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
 617                 if (unlikely(err)) {
 618                         /* currently there is only one error: ENOMEM! */
 619                         size = drbd_bm_capacity(mdev)>>1;
 620                         if (size == 0) {
 621                                 dev_err(DEV, "OUT OF MEMORY! "
 622                                     "Could not allocate bitmap!\n");
 623                         } else {
 624                                 dev_err(DEV, "BM resizing failed. "
 625                                     "Leaving size unchanged at size = %lu KB\n",
 626                                     (unsigned long)size);
 627                         }
 628                         rv = dev_size_error;
 629                 }
 630                 /* racy, see comments above. */
 631                 drbd_set_my_capacity(mdev, size);
 632                 mdev->ldev->md.la_size_sect = size;
 633                 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
 634                      (unsigned long long)size>>1);
 635         }
 636         if (rv == dev_size_error)
 637                 goto out;
 638
 639         la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
 640
 641         md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
 642                 || prev_size       != mdev->ldev->md.md_size_sect;
 643
 644         if (la_size_changed || md_moved) {
 645                 drbd_al_shrink(mdev); /* All extents inactive. */
 646                 dev_info(DEV, "Writing the whole bitmap, %s\n",
 647                          la_size_changed && md_moved ? "size changed and md moved" :
 648                          la_size_changed ? "size changed" : "md moved");
 649                 rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */
 650                 drbd_md_mark_dirty(mdev);
 651         }
 652
 653         if (size > la_size)
 654                 rv = grew;
 655         if (size < la_size)
 656                 rv = shrunk;
 657 out:
 658         lc_unlock(mdev->act_log);
 659         wake_up(&mdev->al_wait);
 660         drbd_resume_io(mdev);
 661
 662         return rv;
 663 }
 664
 665 sector_t
 666 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
 667 {
 668         sector_t p_size = mdev->p_size;   /* partner's disk size. */
 669         sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
 670         sector_t m_size; /* my size */
 671         sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
 672         sector_t size = 0;
 673
 674         m_size = drbd_get_max_capacity(bdev);
 675
 676         if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
 677                 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
 678                 p_size = m_size;
 679         }
 680
 681         if (p_size && m_size) {
 682                 size = min_t(sector_t, p_size, m_size);
 683         } else {
 684                 if (la_size) {
 685                         size = la_size;
 686                         if (m_size && m_size < size)
 687                                 size = m_size;
 688                         if (p_size && p_size < size)
 689                                 size = p_size;
 690                 } else {
 691                         if (m_size)
 692                                 size = m_size;
 693                         if (p_size)
 694                                 size = p_size;
 695                 }
 696         }
 697
 698         if (size == 0)
 699                 dev_err(DEV, "Both nodes diskless!\n");
 700
 701         if (u_size) {
 702                 if (u_size > size)
 703                         dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
 704                             (unsigned long)u_size>>1, (unsigned long)size>>1);
 705                 else
 706                         size = u_size;
 707         }
 708
 709         return size;
 710 }
 711
 712 /**
 713  * drbd_check_al_size() - Ensures that the AL is of the right size
 714  * @mdev:       DRBD device.
 715  *
 716  * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
 717  * failed, and 0 on success. You should call drbd_md_sync() after you called
 718  * this function.
 719  */
 720 static int drbd_check_al_size(struct drbd_conf *mdev)
 721 {
 722         struct lru_cache *n, *t;
 723         struct lc_element *e;
 724         unsigned int in_use;
 725         int i;
 726
 727         ERR_IF(mdev->sync_conf.al_extents < 7)
 728                 mdev->sync_conf.al_extents = 127;
 729
 730         if (mdev->act_log &&
 731             mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
 732                 return 0;
 733
 734         in_use = 0;
 735         t = mdev->act_log;
 736         n = lc_create("act_log", drbd_al_ext_cache,
 737                 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
 738
 739         if (n == NULL) {
 740                 dev_err(DEV, "Cannot allocate act_log lru!\n");
 741                 return -ENOMEM;
 742         }
 743         spin_lock_irq(&mdev->al_lock);
 744         if (t) {
 745                 for (i = 0; i < t->nr_elements; i++) {
 746                         e = lc_element_by_index(t, i);
 747                         if (e->refcnt)
 748                                 dev_err(DEV, "refcnt(%d)==%d\n",
 749                                     e->lc_number, e->refcnt);
 750                         in_use += e->refcnt;
 751                 }
 752         }
 753         if (!in_use)
 754                 mdev->act_log = n;
 755         spin_unlock_irq(&mdev->al_lock);
 756         if (in_use) {
 757                 dev_err(DEV, "Activity log still in use!\n");
 758                 lc_destroy(n);
 759                 return -EBUSY;
 760         } else {
 761                 if (t)
 762                         lc_destroy(t);
 763         }
 764         drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
 765         return 0;
 766 }
 767
 768 void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local)
 769 {
 770         struct request_queue * const q = mdev->rq_queue;
 771         struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
 772         int max_segments = mdev->ldev->dc.max_bio_bvecs;
 773
 774         max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
 775
 776         blk_queue_max_hw_sectors(q, max_seg_s >> 9);
 777         blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
 778         blk_queue_max_segment_size(q, max_seg_s);
 779         blk_queue_logical_block_size(q, 512);
 780         blk_queue_segment_boundary(q, PAGE_SIZE-1);
 781         blk_stack_limits(&q->limits, &b->limits, 0);
 782
 783         dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q));
 784
 785         if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
 786                 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
 787                      q->backing_dev_info.ra_pages,
 788                      b->backing_dev_info.ra_pages);
 789                 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
 790         }
 791 }
 792
 793 /* serialize deconfig (worker exiting, doing cleanup)
 794  * and reconfig (drbdsetup disk, drbdsetup net)
 795  *
 796  * Wait for a potentially exiting worker, then restart it,
 797  * or start a new one.  Flush any pending work, there may still be an
 798  * after_state_change queued.
 799  */
 800 static void drbd_reconfig_start(struct drbd_conf *mdev)
 801 {
 802         wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
 803         wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
 804         drbd_thread_start(&mdev->worker);
 805         drbd_flush_workqueue(mdev);
 806 }
 807
 808 /* if still unconfigured, stops worker again.
 809  * if configured now, clears CONFIG_PENDING.
 810  * wakes potential waiters */
 811 static void drbd_reconfig_done(struct drbd_conf *mdev)
 812 {
 813         spin_lock_irq(&mdev->req_lock);
 814         if (mdev->state.disk == D_DISKLESS &&
 815             mdev->state.conn == C_STANDALONE &&
 816             mdev->state.role == R_SECONDARY) {
 817                 set_bit(DEVICE_DYING, &mdev->flags);
 818                 drbd_thread_stop_nowait(&mdev->worker);
 819         } else
 820                 clear_bit(CONFIG_PENDING, &mdev->flags);
 821         spin_unlock_irq(&mdev->req_lock);
 822         wake_up(&mdev->state_wait);
 823 }
 824
 825 /* Make sure IO is suspended before calling this function(). */
 826 static void drbd_suspend_al(struct drbd_conf *mdev)
 827 {
 828         int s = 0;
 829
 830         if (lc_try_lock(mdev->act_log)) {
 831                 drbd_al_shrink(mdev);
 832                 lc_unlock(mdev->act_log);
 833         } else {
 834                 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
 835                 return;
 836         }
 837
 838         spin_lock_irq(&mdev->req_lock);
 839         if (mdev->state.conn < C_CONNECTED)
 840                 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
 841
 842         spin_unlock_irq(&mdev->req_lock);
 843
 844         if (s)
 845                 dev_info(DEV, "Suspended AL updates\n");
 846 }
 847
 848 /* does always return 0;
 849  * interesting return code is in reply->ret_code */
 850 static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
 851                              struct drbd_nl_cfg_reply *reply)
 852 {
 853         enum drbd_ret_codes retcode;
 854         enum determine_dev_size dd;
 855         sector_t max_possible_sectors;
 856         sector_t min_md_device_sectors;
 857         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
 858         struct inode *inode, *inode2;
 859         struct lru_cache *resync_lru = NULL;
 860         union drbd_state ns, os;
 861         unsigned int max_seg_s;
 862         int rv;
 863         int cp_discovered = 0;
 864         int logical_block_size;
 865
 866         drbd_reconfig_start(mdev);
 867
 868         /* if you want to reconfigure, please tear down first */
 869         if (mdev->state.disk > D_DISKLESS) {
 870                 retcode = ERR_DISK_CONFIGURED;
 871                 goto fail;
 872         }
 873
 874         /* allocation not in the IO path, cqueue thread context */
 875         nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
 876         if (!nbc) {
 877                 retcode = ERR_NOMEM;
 878                 goto fail;
 879         }
 880
 881         nbc->dc.disk_size     = DRBD_DISK_SIZE_SECT_DEF;
 882         nbc->dc.on_io_error   = DRBD_ON_IO_ERROR_DEF;
 883         nbc->dc.fencing       = DRBD_FENCING_DEF;
 884         nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
 885
 886         if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
 887                 retcode = ERR_MANDATORY_TAG;
 888                 goto fail;
 889         }
 890
 891         if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
 892                 retcode = ERR_MD_IDX_INVALID;
 893                 goto fail;
 894         }
 895
 896         if (get_net_conf(mdev)) {
 897                 int prot = mdev->net_conf->wire_protocol;
 898                 put_net_conf(mdev);
 899                 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) {
 900                         retcode = ERR_STONITH_AND_PROT_A;
 901                         goto fail;
 902                 }
 903         }
 904
 905         nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0);
 906         if (IS_ERR(nbc->lo_file)) {
 907                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
 908                     PTR_ERR(nbc->lo_file));
 909                 nbc->lo_file = NULL;
 910                 retcode = ERR_OPEN_DISK;
 911                 goto fail;
 912         }
 913
 914         inode = nbc->lo_file->f_dentry->d_inode;
 915
 916         if (!S_ISBLK(inode->i_mode)) {
 917                 retcode = ERR_DISK_NOT_BDEV;
 918                 goto fail;
 919         }
 920
 921         nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0);
 922         if (IS_ERR(nbc->md_file)) {
 923                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
 924                     PTR_ERR(nbc->md_file));
 925                 nbc->md_file = NULL;
 926                 retcode = ERR_OPEN_MD_DISK;
 927                 goto fail;
 928         }
 929
 930         inode2 = nbc->md_file->f_dentry->d_inode;
 931
 932         if (!S_ISBLK(inode2->i_mode)) {
 933                 retcode = ERR_MD_NOT_BDEV;
 934                 goto fail;
 935         }
 936
 937         nbc->backing_bdev = inode->i_bdev;
 938         if (bd_claim(nbc->backing_bdev, mdev)) {
 939                 printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n",
 940                        nbc->backing_bdev, mdev,
 941                        nbc->backing_bdev->bd_holder,
 942                        nbc->backing_bdev->bd_contains->bd_holder,
 943                        nbc->backing_bdev->bd_holders);
 944                 retcode = ERR_BDCLAIM_DISK;
 945                 goto fail;
 946         }
 947
 948         resync_lru = lc_create("resync", drbd_bm_ext_cache,
 949                         61, sizeof(struct bm_extent),
 950                         offsetof(struct bm_extent, lce));
 951         if (!resync_lru) {
 952                 retcode = ERR_NOMEM;
 953                 goto release_bdev_fail;
 954         }
 955
 956         /* meta_dev_idx >= 0: external fixed size,
 957          * possibly multiple drbd sharing one meta device.
 958          * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is
 959          * not yet used by some other drbd minor!
 960          * (if you use drbd.conf + drbdadm,
 961          * that should check it for you already; but if you don't, or someone
 962          * fooled it, we need to double check here) */
 963         nbc->md_bdev = inode2->i_bdev;
 964         if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev
 965                                 : (void *) drbd_m_holder)) {
 966                 retcode = ERR_BDCLAIM_MD_DISK;
 967                 goto release_bdev_fail;
 968         }
 969
 970         if ((nbc->backing_bdev == nbc->md_bdev) !=
 971             (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
 972              nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
 973                 retcode = ERR_MD_IDX_INVALID;
 974                 goto release_bdev2_fail;
 975         }
 976
 977         /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
 978         drbd_md_set_sector_offsets(mdev, nbc);
 979
 980         if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
 981                 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
 982                         (unsigned long long) drbd_get_max_capacity(nbc),
 983                         (unsigned long long) nbc->dc.disk_size);
 984                 retcode = ERR_DISK_TO_SMALL;
 985                 goto release_bdev2_fail;
 986         }
 987
 988         if (nbc->dc.meta_dev_idx < 0) {
 989                 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
 990                 /* at least one MB, otherwise it does not make sense */
 991                 min_md_device_sectors = (2<<10);
 992         } else {
 993                 max_possible_sectors = DRBD_MAX_SECTORS;
 994                 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
 995         }
 996
 997         if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
 998                 retcode = ERR_MD_DISK_TO_SMALL;
 999                 dev_warn(DEV, "refusing attach: md-device too small, "
1000                      "at least %llu sectors needed for this meta-disk type\n",
1001                      (unsigned long long) min_md_device_sectors);
1002                 goto release_bdev2_fail;
1003         }
1004
1005         /* Make sure the new disk is big enough
1006          * (we may currently be R_PRIMARY with no local disk...) */
1007         if (drbd_get_max_capacity(nbc) <
1008             drbd_get_capacity(mdev->this_bdev)) {
1009                 retcode = ERR_DISK_TO_SMALL;
1010                 goto release_bdev2_fail;
1011         }
1012
1013         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1014
1015         if (nbc->known_size > max_possible_sectors) {
1016                 dev_warn(DEV, "==> truncating very big lower level device "
1017                         "to currently maximum possible %llu sectors <==\n",
1018                         (unsigned long long) max_possible_sectors);
1019                 if (nbc->dc.meta_dev_idx >= 0)
1020                         dev_warn(DEV, "==>> using internal or flexible "
1021                                       "meta data may help <<==\n");
1022         }
1023
1024         drbd_suspend_io(mdev);
1025         /* also wait for the last barrier ack. */
1026         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state));
1027         /* and for any other previously queued work */
1028         drbd_flush_workqueue(mdev);
1029
1030         retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1031         drbd_resume_io(mdev);
1032         if (retcode < SS_SUCCESS)
1033                 goto release_bdev2_fail;
1034
1035         if (!get_ldev_if_state(mdev, D_ATTACHING))
1036                 goto force_diskless;
1037
1038         drbd_md_set_sector_offsets(mdev, nbc);
1039
1040         /* allocate a second IO page if logical_block_size != 512 */
1041         logical_block_size = bdev_logical_block_size(nbc->md_bdev);
1042         if (logical_block_size == 0)
1043                 logical_block_size = MD_SECTOR_SIZE;
1044
1045         if (logical_block_size != MD_SECTOR_SIZE) {
1046                 if (!mdev->md_io_tmpp) {
1047                         struct page *page = alloc_page(GFP_NOIO);
1048                         if (!page)
1049                                 goto force_diskless_dec;
1050
1051                         dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
1052                              logical_block_size, MD_SECTOR_SIZE);
1053                         dev_warn(DEV, "Workaround engaged (has performance impact).\n");
1054
1055                         mdev->md_io_tmpp = page;
1056                 }
1057         }
1058
1059         if (!mdev->bitmap) {
1060                 if (drbd_bm_init(mdev)) {
1061                         retcode = ERR_NOMEM;
1062                         goto force_diskless_dec;
1063                 }
1064         }
1065
1066         retcode = drbd_md_read(mdev, nbc);
1067         if (retcode != NO_ERROR)
1068                 goto force_diskless_dec;
1069
1070         if (mdev->state.conn < C_CONNECTED &&
1071             mdev->state.role == R_PRIMARY &&
1072             (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1073                 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1074                     (unsigned long long)mdev->ed_uuid);
1075                 retcode = ERR_DATA_NOT_CURRENT;
1076                 goto force_diskless_dec;
1077         }
1078
1079         /* Since we are diskless, fix the activity log first... */
1080         if (drbd_check_al_size(mdev)) {
1081                 retcode = ERR_NOMEM;
1082                 goto force_diskless_dec;
1083         }
1084
1085         /* Prevent shrinking of consistent devices ! */
1086         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1087             drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
1088                 dev_warn(DEV, "refusing to truncate a consistent device\n");
1089                 retcode = ERR_DISK_TO_SMALL;
1090                 goto force_diskless_dec;
1091         }
1092
1093         if (!drbd_al_read_log(mdev, nbc)) {
1094                 retcode = ERR_IO_MD_DISK;
1095                 goto force_diskless_dec;
1096         }
1097
1098         /* Reset the "barriers don't work" bits here, then force meta data to
1099          * be written, to ensure we determine if barriers are supported. */
1100         if (nbc->dc.no_md_flush)
1101                 set_bit(MD_NO_BARRIER, &mdev->flags);
1102         else
1103                 clear_bit(MD_NO_BARRIER, &mdev->flags);
1104
1105         /* Point of no return reached.
1106          * Devices and memory are no longer released by error cleanup below.
1107          * now mdev takes over responsibility, and the state engine should
1108          * clean it up somewhere.  */
1109         D_ASSERT(mdev->ldev == NULL);
1110         mdev->ldev = nbc;
1111         mdev->resync = resync_lru;
1112         nbc = NULL;
1113         resync_lru = NULL;
1114
1115         mdev->write_ordering = WO_bio_barrier;
1116         drbd_bump_write_ordering(mdev, WO_bio_barrier);
1117
1118         if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1119                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1120         else
1121                 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1122
1123         if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1124             !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) {
1125                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1126                 cp_discovered = 1;
1127         }
1128
1129         mdev->send_cnt = 0;
1130         mdev->recv_cnt = 0;
1131         mdev->read_cnt = 0;
1132         mdev->writ_cnt = 0;
1133
1134         max_seg_s = DRBD_MAX_SEGMENT_SIZE;
1135         if (mdev->state.conn == C_CONNECTED) {
1136                 /* We are Primary, Connected, and now attach a new local
1137                  * backing store. We must not increase the user visible maximum
1138                  * bio size on this device to something the peer may not be
1139                  * able to handle. */
1140                 if (mdev->agreed_pro_version < 94)
1141                         max_seg_s = queue_max_segment_size(mdev->rq_queue);
1142                 else if (mdev->agreed_pro_version == 94)
1143                         max_seg_s = DRBD_MAX_SIZE_H80_PACKET;
1144                 /* else: drbd 8.3.9 and later, stay with default */
1145         }
1146
1147         drbd_setup_queue_param(mdev, max_seg_s);
1148
1149         /* If I am currently not R_PRIMARY,
1150          * but meta data primary indicator is set,
1151          * I just now recover from a hard crash,
1152          * and have been R_PRIMARY before that crash.
1153          *
1154          * Now, if I had no connection before that crash
1155          * (have been degraded R_PRIMARY), chances are that
1156          * I won't find my peer now either.
1157          *
1158          * In that case, and _only_ in that case,
1159          * we use the degr-wfc-timeout instead of the default,
1160          * so we can automatically recover from a crash of a
1161          * degraded but active "cluster" after a certain timeout.
1162          */
1163         clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1164         if (mdev->state.role != R_PRIMARY &&
1165              drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1166             !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1167                 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1168
1169         dd = drbd_determin_dev_size(mdev, 0);
1170         if (dd == dev_size_error) {
1171                 retcode = ERR_NOMEM_BITMAP;
1172                 goto force_diskless_dec;
1173         } else if (dd == grew)
1174                 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1175
1176         if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1177                 dev_info(DEV, "Assuming that all blocks are out of sync "
1178                      "(aka FullSync)\n");
1179                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) {
1180                         retcode = ERR_IO_MD_DISK;
1181                         goto force_diskless_dec;
1182                 }
1183         } else {
1184                 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
1185                         retcode = ERR_IO_MD_DISK;
1186                         goto force_diskless_dec;
1187                 }
1188         }
1189
1190         if (cp_discovered) {
1191                 drbd_al_apply_to_bm(mdev);
1192                 drbd_al_to_on_disk_bm(mdev);
1193         }
1194
1195         if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1196                 drbd_suspend_al(mdev); /* IO is still suspended here... */
1197
1198         spin_lock_irq(&mdev->req_lock);
1199         os = mdev->state;
1200         ns.i = os.i;
1201         /* If MDF_CONSISTENT is not set go into inconsistent state,
1202            otherwise investigate MDF_WasUpToDate...
1203            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1204            otherwise into D_CONSISTENT state.
1205         */
1206         if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1207                 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1208                         ns.disk = D_CONSISTENT;
1209                 else
1210                         ns.disk = D_OUTDATED;
1211         } else {
1212                 ns.disk = D_INCONSISTENT;
1213         }
1214
1215         if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1216                 ns.pdsk = D_OUTDATED;
1217
1218         if ( ns.disk == D_CONSISTENT &&
1219             (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1220                 ns.disk = D_UP_TO_DATE;
1221
1222         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1223            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1224            this point, because drbd_request_state() modifies these
1225            flags. */
1226
1227         /* In case we are C_CONNECTED postpone any decision on the new disk
1228            state after the negotiation phase. */
1229         if (mdev->state.conn == C_CONNECTED) {
1230                 mdev->new_state_tmp.i = ns.i;
1231                 ns.i = os.i;
1232                 ns.disk = D_NEGOTIATING;
1233
1234                 /* We expect to receive up-to-date UUIDs soon.
1235                    To avoid a race in receive_state, free p_uuid while
1236                    holding req_lock. I.e. atomic with the state change */
1237                 kfree(mdev->p_uuid);
1238                 mdev->p_uuid = NULL;
1239         }
1240
1241         rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1242         ns = mdev->state;
1243         spin_unlock_irq(&mdev->req_lock);
1244
1245         if (rv < SS_SUCCESS)
1246                 goto force_diskless_dec;
1247
1248         if (mdev->state.role == R_PRIMARY)
1249                 mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1250         else
1251                 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1252
1253         drbd_md_mark_dirty(mdev);
1254         drbd_md_sync(mdev);
1255
1256         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1257         put_ldev(mdev);
1258         reply->ret_code = retcode;
1259         drbd_reconfig_done(mdev);
1260         return 0;
1261
1262  force_diskless_dec:
1263         put_ldev(mdev);
1264  force_diskless:
1265         drbd_force_state(mdev, NS(disk, D_DISKLESS));
1266         drbd_md_sync(mdev);
1267  release_bdev2_fail:
1268         if (nbc)
1269                 bd_release(nbc->md_bdev);
1270  release_bdev_fail:
1271         if (nbc)
1272                 bd_release(nbc->backing_bdev);
1273  fail:
1274         if (nbc) {
1275                 if (nbc->lo_file)
1276                         fput(nbc->lo_file);
1277                 if (nbc->md_file)
1278                         fput(nbc->md_file);
1279                 kfree(nbc);
1280         }
1281         lc_destroy(resync_lru);
1282
1283         reply->ret_code = retcode;
1284         drbd_reconfig_done(mdev);
1285         return 0;
1286 }
1287
1288 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1289                           struct drbd_nl_cfg_reply *reply)
1290 {
1291         reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
1292         return 0;
1293 }
1294
1295 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1296                             struct drbd_nl_cfg_reply *reply)
1297 {
1298         int i, ns;
1299         enum drbd_ret_codes retcode;
1300         struct net_conf *new_conf = NULL;
1301         struct crypto_hash *tfm = NULL;
1302         struct crypto_hash *integrity_w_tfm = NULL;
1303         struct crypto_hash *integrity_r_tfm = NULL;
1304         struct hlist_head *new_tl_hash = NULL;
1305         struct hlist_head *new_ee_hash = NULL;
1306         struct drbd_conf *odev;
1307         char hmac_name[CRYPTO_MAX_ALG_NAME];
1308         void *int_dig_out = NULL;
1309         void *int_dig_in = NULL;
1310         void *int_dig_vv = NULL;
1311         struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1312
1313         drbd_reconfig_start(mdev);
1314
1315         if (mdev->state.conn > C_STANDALONE) {
1316                 retcode = ERR_NET_CONFIGURED;
1317                 goto fail;
1318         }
1319
1320         /* allocation not in the IO path, cqueue thread context */
1321         new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1322         if (!new_conf) {
1323                 retcode = ERR_NOMEM;
1324                 goto fail;
1325         }
1326
1327         new_conf->timeout          = DRBD_TIMEOUT_DEF;
1328         new_conf->try_connect_int  = DRBD_CONNECT_INT_DEF;
1329         new_conf->ping_int         = DRBD_PING_INT_DEF;
1330         new_conf->max_epoch_size   = DRBD_MAX_EPOCH_SIZE_DEF;
1331         new_conf->max_buffers      = DRBD_MAX_BUFFERS_DEF;
1332         new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1333         new_conf->sndbuf_size      = DRBD_SNDBUF_SIZE_DEF;
1334         new_conf->rcvbuf_size      = DRBD_RCVBUF_SIZE_DEF;
1335         new_conf->ko_count         = DRBD_KO_COUNT_DEF;
1336         new_conf->after_sb_0p      = DRBD_AFTER_SB_0P_DEF;
1337         new_conf->after_sb_1p      = DRBD_AFTER_SB_1P_DEF;
1338         new_conf->after_sb_2p      = DRBD_AFTER_SB_2P_DEF;
1339         new_conf->want_lose        = 0;
1340         new_conf->two_primaries    = 0;
1341         new_conf->wire_protocol    = DRBD_PROT_C;
1342         new_conf->ping_timeo       = DRBD_PING_TIMEO_DEF;
1343         new_conf->rr_conflict      = DRBD_RR_CONFLICT_DEF;
1344
1345         if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1346                 retcode = ERR_MANDATORY_TAG;
1347                 goto fail;
1348         }
1349
1350         if (new_conf->two_primaries
1351             && (new_conf->wire_protocol != DRBD_PROT_C)) {
1352                 retcode = ERR_NOT_PROTO_C;
1353                 goto fail;
1354         }
1355
1356         if (get_ldev(mdev)) {
1357                 enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
1358                 put_ldev(mdev);
1359                 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) {
1360                         retcode = ERR_STONITH_AND_PROT_A;
1361                         goto fail;
1362                 }
1363         }
1364
1365         if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1366                 retcode = ERR_DISCARD;
1367                 goto fail;
1368         }
1369
1370         retcode = NO_ERROR;
1371
1372         new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1373         new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1374         for (i = 0; i < minor_count; i++) {
1375                 odev = minor_to_mdev(i);
1376                 if (!odev || odev == mdev)
1377                         continue;
1378                 if (get_net_conf(odev)) {
1379                         taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1380                         if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1381                             !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1382                                 retcode = ERR_LOCAL_ADDR;
1383
1384                         taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1385                         if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1386                             !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1387                                 retcode = ERR_PEER_ADDR;
1388
1389                         put_net_conf(odev);
1390                         if (retcode != NO_ERROR)
1391                                 goto fail;
1392                 }
1393         }
1394
1395         if (new_conf->cram_hmac_alg[0] != 0) {
1396                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1397                         new_conf->cram_hmac_alg);
1398                 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1399                 if (IS_ERR(tfm)) {
1400                         tfm = NULL;
1401                         retcode = ERR_AUTH_ALG;
1402                         goto fail;
1403                 }
1404
1405                 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
1406                         retcode = ERR_AUTH_ALG_ND;
1407                         goto fail;
1408                 }
1409         }
1410
1411         if (new_conf->integrity_alg[0]) {
1412                 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1413                 if (IS_ERR(integrity_w_tfm)) {
1414                         integrity_w_tfm = NULL;
1415                         retcode=ERR_INTEGRITY_ALG;
1416                         goto fail;
1417                 }
1418
1419                 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1420                         retcode=ERR_INTEGRITY_ALG_ND;
1421                         goto fail;
1422                 }
1423
1424                 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1425                 if (IS_ERR(integrity_r_tfm)) {
1426                         integrity_r_tfm = NULL;
1427                         retcode=ERR_INTEGRITY_ALG;
1428                         goto fail;
1429                 }
1430         }
1431
1432         ns = new_conf->max_epoch_size/8;
1433         if (mdev->tl_hash_s != ns) {
1434                 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1435                 if (!new_tl_hash) {
1436                         retcode = ERR_NOMEM;
1437                         goto fail;
1438                 }
1439         }
1440
1441         ns = new_conf->max_buffers/8;
1442         if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1443                 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1444                 if (!new_ee_hash) {
1445                         retcode = ERR_NOMEM;
1446                         goto fail;
1447                 }
1448         }
1449
1450         ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1451
1452         if (integrity_w_tfm) {
1453                 i = crypto_hash_digestsize(integrity_w_tfm);
1454                 int_dig_out = kmalloc(i, GFP_KERNEL);
1455                 if (!int_dig_out) {
1456                         retcode = ERR_NOMEM;
1457                         goto fail;
1458                 }
1459                 int_dig_in = kmalloc(i, GFP_KERNEL);
1460                 if (!int_dig_in) {
1461                         retcode = ERR_NOMEM;
1462                         goto fail;
1463                 }
1464                 int_dig_vv = kmalloc(i, GFP_KERNEL);
1465                 if (!int_dig_vv) {
1466                         retcode = ERR_NOMEM;
1467                         goto fail;
1468                 }
1469         }
1470
1471         if (!mdev->bitmap) {
1472                 if(drbd_bm_init(mdev)) {
1473                         retcode = ERR_NOMEM;
1474                         goto fail;
1475                 }
1476         }
1477
1478         drbd_flush_workqueue(mdev);
1479         spin_lock_irq(&mdev->req_lock);
1480         if (mdev->net_conf != NULL) {
1481                 retcode = ERR_NET_CONFIGURED;
1482                 spin_unlock_irq(&mdev->req_lock);
1483                 goto fail;
1484         }
1485         mdev->net_conf = new_conf;
1486
1487         mdev->send_cnt = 0;
1488         mdev->recv_cnt = 0;
1489
1490         if (new_tl_hash) {
1491                 kfree(mdev->tl_hash);
1492                 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1493                 mdev->tl_hash = new_tl_hash;
1494         }
1495
1496         if (new_ee_hash) {
1497                 kfree(mdev->ee_hash);
1498                 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1499                 mdev->ee_hash = new_ee_hash;
1500         }
1501
1502         crypto_free_hash(mdev->cram_hmac_tfm);
1503         mdev->cram_hmac_tfm = tfm;
1504
1505         crypto_free_hash(mdev->integrity_w_tfm);
1506         mdev->integrity_w_tfm = integrity_w_tfm;
1507
1508         crypto_free_hash(mdev->integrity_r_tfm);
1509         mdev->integrity_r_tfm = integrity_r_tfm;
1510
1511         kfree(mdev->int_dig_out);
1512         kfree(mdev->int_dig_in);
1513         kfree(mdev->int_dig_vv);
1514         mdev->int_dig_out=int_dig_out;
1515         mdev->int_dig_in=int_dig_in;
1516         mdev->int_dig_vv=int_dig_vv;
1517         retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL);
1518         spin_unlock_irq(&mdev->req_lock);
1519
1520         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1521         reply->ret_code = retcode;
1522         drbd_reconfig_done(mdev);
1523         return 0;
1524
1525 fail:
1526         kfree(int_dig_out);
1527         kfree(int_dig_in);
1528         kfree(int_dig_vv);
1529         crypto_free_hash(tfm);
1530         crypto_free_hash(integrity_w_tfm);
1531         crypto_free_hash(integrity_r_tfm);
1532         kfree(new_tl_hash);
1533         kfree(new_ee_hash);
1534         kfree(new_conf);
1535
1536         reply->ret_code = retcode;
1537         drbd_reconfig_done(mdev);
1538         return 0;
1539 }
1540
1541 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1542                               struct drbd_nl_cfg_reply *reply)
1543 {
1544         int retcode;
1545
1546         retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1547
1548         if (retcode == SS_NOTHING_TO_DO)
1549                 goto done;
1550         else if (retcode == SS_ALREADY_STANDALONE)
1551                 goto done;
1552         else if (retcode == SS_PRIMARY_NOP) {
1553                 /* Our statche checking code wants to see the peer outdated. */
1554                 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1555                                                       pdsk, D_OUTDATED));
1556         } else if (retcode == SS_CW_FAILED_BY_PEER) {
1557                 /* The peer probably wants to see us outdated. */
1558                 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1559                                                         disk, D_OUTDATED),
1560                                               CS_ORDERED);
1561                 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1562                         drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1563                         retcode = SS_SUCCESS;
1564                 }
1565         }
1566
1567         if (retcode < SS_SUCCESS)
1568                 goto fail;
1569
1570         if (wait_event_interruptible(mdev->state_wait,
1571                                      mdev->state.conn != C_DISCONNECTING)) {
1572                 /* Do not test for mdev->state.conn == C_STANDALONE, since
1573                    someone else might connect us in the mean time! */
1574                 retcode = ERR_INTR;
1575                 goto fail;
1576         }
1577
1578  done:
1579         retcode = NO_ERROR;
1580  fail:
1581         drbd_md_sync(mdev);
1582         reply->ret_code = retcode;
1583         return 0;
1584 }
1585
1586 void resync_after_online_grow(struct drbd_conf *mdev)
1587 {
1588         int iass; /* I am sync source */
1589
1590         dev_info(DEV, "Resync of new storage after online grow\n");
1591         if (mdev->state.role != mdev->state.peer)
1592                 iass = (mdev->state.role == R_PRIMARY);
1593         else
1594                 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1595
1596         if (iass)
1597                 drbd_start_resync(mdev, C_SYNC_SOURCE);
1598         else
1599                 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1600 }
1601
1602 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1603                           struct drbd_nl_cfg_reply *reply)
1604 {
1605         struct resize rs;
1606         int retcode = NO_ERROR;
1607         enum determine_dev_size dd;
1608         enum dds_flags ddsf;
1609
1610         memset(&rs, 0, sizeof(struct resize));
1611         if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1612                 retcode = ERR_MANDATORY_TAG;
1613                 goto fail;
1614         }
1615
1616         if (mdev->state.conn > C_CONNECTED) {
1617                 retcode = ERR_RESIZE_RESYNC;
1618                 goto fail;
1619         }
1620
1621         if (mdev->state.role == R_SECONDARY &&
1622             mdev->state.peer == R_SECONDARY) {
1623                 retcode = ERR_NO_PRIMARY;
1624                 goto fail;
1625         }
1626
1627         if (!get_ldev(mdev)) {
1628                 retcode = ERR_NO_DISK;
1629                 goto fail;
1630         }
1631
1632         if (rs.no_resync && mdev->agreed_pro_version < 93) {
1633                 retcode = ERR_NEED_APV_93;
1634                 goto fail;
1635         }
1636
1637         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
1638                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
1639
1640         mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
1641         ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
1642         dd = drbd_determin_dev_size(mdev, ddsf);
1643         drbd_md_sync(mdev);
1644         put_ldev(mdev);
1645         if (dd == dev_size_error) {
1646                 retcode = ERR_NOMEM_BITMAP;
1647                 goto fail;
1648         }
1649
1650         if (mdev->state.conn == C_CONNECTED) {
1651                 if (dd == grew)
1652                         set_bit(RESIZE_PENDING, &mdev->flags);
1653
1654                 drbd_send_uuids(mdev);
1655                 drbd_send_sizes(mdev, 1, ddsf);
1656         }
1657
1658  fail:
1659         reply->ret_code = retcode;
1660         return 0;
1661 }
1662
1663 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1664                                struct drbd_nl_cfg_reply *reply)
1665 {
1666         int retcode = NO_ERROR;
1667         int err;
1668         int ovr; /* online verify running */
1669         int rsr; /* re-sync running */
1670         struct crypto_hash *verify_tfm = NULL;
1671         struct crypto_hash *csums_tfm = NULL;
1672         struct syncer_conf sc;
1673         cpumask_var_t new_cpu_mask;
1674         int *rs_plan_s = NULL;
1675         int fifo_size;
1676
1677         if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1678                 retcode = ERR_NOMEM;
1679                 goto fail;
1680         }
1681
1682         if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1683                 memset(&sc, 0, sizeof(struct syncer_conf));
1684                 sc.rate       = DRBD_RATE_DEF;
1685                 sc.after      = DRBD_AFTER_DEF;
1686                 sc.al_extents = DRBD_AL_EXTENTS_DEF;
1687                 sc.on_no_data  = DRBD_ON_NO_DATA_DEF;
1688                 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF;
1689                 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF;
1690                 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF;
1691                 sc.c_max_rate = DRBD_C_MAX_RATE_DEF;
1692                 sc.c_min_rate = DRBD_C_MIN_RATE_DEF;
1693         } else
1694                 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1695
1696         if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1697                 retcode = ERR_MANDATORY_TAG;
1698                 goto fail;
1699         }
1700
1701         /* re-sync running */
1702         rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1703                 mdev->state.conn == C_SYNC_TARGET ||
1704                 mdev->state.conn == C_PAUSED_SYNC_S ||
1705                 mdev->state.conn == C_PAUSED_SYNC_T );
1706
1707         if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1708                 retcode = ERR_CSUMS_RESYNC_RUNNING;
1709                 goto fail;
1710         }
1711
1712         if (!rsr && sc.csums_alg[0]) {
1713                 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1714                 if (IS_ERR(csums_tfm)) {
1715                         csums_tfm = NULL;
1716                         retcode = ERR_CSUMS_ALG;
1717                         goto fail;
1718                 }
1719
1720                 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1721                         retcode = ERR_CSUMS_ALG_ND;
1722                         goto fail;
1723                 }
1724         }
1725
1726         /* online verify running */
1727         ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1728
1729         if (ovr) {
1730                 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1731                         retcode = ERR_VERIFY_RUNNING;
1732                         goto fail;
1733                 }
1734         }
1735
1736         if (!ovr && sc.verify_alg[0]) {
1737                 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1738                 if (IS_ERR(verify_tfm)) {
1739                         verify_tfm = NULL;
1740                         retcode = ERR_VERIFY_ALG;
1741                         goto fail;
1742                 }
1743
1744                 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1745                         retcode = ERR_VERIFY_ALG_ND;
1746                         goto fail;
1747                 }
1748         }
1749
1750         /* silently ignore cpu mask on UP kernel */
1751         if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1752                 err = __bitmap_parse(sc.cpu_mask, 32, 0,
1753                                 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1754                 if (err) {
1755                         dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1756                         retcode = ERR_CPU_MASK_PARSE;
1757                         goto fail;
1758                 }
1759         }
1760
1761         ERR_IF (sc.rate < 1) sc.rate = 1;
1762         ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
1763 #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1764         if (sc.al_extents > AL_MAX) {
1765                 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1766                 sc.al_extents = AL_MAX;
1767         }
1768 #undef AL_MAX
1769
1770         /* to avoid spurious errors when configuring minors before configuring
1771          * the minors they depend on: if necessary, first create the minor we
1772          * depend on */
1773         if (sc.after >= 0)
1774                 ensure_mdev(sc.after, 1);
1775
1776         /* most sanity checks done, try to assign the new sync-after
1777          * dependency.  need to hold the global lock in there,
1778          * to avoid a race in the dependency loop check. */
1779         retcode = drbd_alter_sa(mdev, sc.after);
1780         if (retcode != NO_ERROR)
1781                 goto fail;
1782
1783         fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1784         if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
1785                 rs_plan_s   = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
1786                 if (!rs_plan_s) {
1787                         dev_err(DEV, "kmalloc of fifo_buffer failed");
1788                         retcode = ERR_NOMEM;
1789                         goto fail;
1790                 }
1791         }
1792
1793         /* ok, assign the rest of it as well.
1794          * lock against receive_SyncParam() */
1795         spin_lock(&mdev->peer_seq_lock);
1796         mdev->sync_conf = sc;
1797
1798         if (!rsr) {
1799                 crypto_free_hash(mdev->csums_tfm);
1800                 mdev->csums_tfm = csums_tfm;
1801                 csums_tfm = NULL;
1802         }
1803
1804         if (!ovr) {
1805                 crypto_free_hash(mdev->verify_tfm);
1806                 mdev->verify_tfm = verify_tfm;
1807                 verify_tfm = NULL;
1808         }
1809
1810         if (fifo_size != mdev->rs_plan_s.size) {
1811                 kfree(mdev->rs_plan_s.values);
1812                 mdev->rs_plan_s.values = rs_plan_s;
1813                 mdev->rs_plan_s.size   = fifo_size;
1814                 mdev->rs_planed = 0;
1815                 rs_plan_s = NULL;
1816         }
1817
1818         spin_unlock(&mdev->peer_seq_lock);
1819
1820         if (get_ldev(mdev)) {
1821                 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1822                 drbd_al_shrink(mdev);
1823                 err = drbd_check_al_size(mdev);
1824                 lc_unlock(mdev->act_log);
1825                 wake_up(&mdev->al_wait);
1826
1827                 put_ldev(mdev);
1828                 drbd_md_sync(mdev);
1829
1830                 if (err) {
1831                         retcode = ERR_NOMEM;
1832                         goto fail;
1833                 }
1834         }
1835
1836         if (mdev->state.conn >= C_CONNECTED)
1837                 drbd_send_sync_param(mdev, &sc);
1838
1839         if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
1840                 cpumask_copy(mdev->cpu_mask, new_cpu_mask);
1841                 drbd_calc_cpu_mask(mdev);
1842                 mdev->receiver.reset_cpu_mask = 1;
1843                 mdev->asender.reset_cpu_mask = 1;
1844                 mdev->worker.reset_cpu_mask = 1;
1845         }
1846
1847         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1848 fail:
1849         kfree(rs_plan_s);
1850         free_cpumask_var(new_cpu_mask);
1851         crypto_free_hash(csums_tfm);
1852         crypto_free_hash(verify_tfm);
1853         reply->ret_code = retcode;
1854         return 0;
1855 }
1856
1857 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1858                               struct drbd_nl_cfg_reply *reply)
1859 {
1860         int retcode;
1861
1862         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1863
1864         if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1865                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1866
1867         while (retcode == SS_NEED_CONNECTION) {
1868                 spin_lock_irq(&mdev->req_lock);
1869                 if (mdev->state.conn < C_CONNECTED)
1870                         retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1871                 spin_unlock_irq(&mdev->req_lock);
1872
1873                 if (retcode != SS_NEED_CONNECTION)
1874                         break;
1875
1876                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1877         }
1878
1879         reply->ret_code = retcode;
1880         return 0;
1881 }
1882
1883 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
1884 {
1885         int rv;
1886
1887         rv = drbd_bmio_set_n_write(mdev);
1888         drbd_suspend_al(mdev);
1889         return rv;
1890 }
1891
1892 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1893                                    struct drbd_nl_cfg_reply *reply)
1894 {
1895         int retcode;
1896
1897         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
1898
1899         if (retcode < SS_SUCCESS) {
1900                 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
1901                         /* The peer will get a resync upon connect anyways. Just make that
1902                            into a full resync. */
1903                         retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
1904                         if (retcode >= SS_SUCCESS) {
1905                                 /* open coded drbd_bitmap_io() */
1906                                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
1907                                                    "set_n_write from invalidate_peer"))
1908                                         retcode = ERR_IO_MD_DISK;
1909                         }
1910                 } else
1911                         retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1912         }
1913
1914         reply->ret_code = retcode;
1915         return 0;
1916 }
1917
1918 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1919                               struct drbd_nl_cfg_reply *reply)
1920 {
1921         int retcode = NO_ERROR;
1922
1923         if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1924                 retcode = ERR_PAUSE_IS_SET;
1925
1926         reply->ret_code = retcode;
1927         return 0;
1928 }
1929
1930 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1931                                struct drbd_nl_cfg_reply *reply)
1932 {
1933         int retcode = NO_ERROR;
1934
1935         if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO)
1936                 retcode = ERR_PAUSE_IS_CLEAR;
1937
1938         reply->ret_code = retcode;
1939         return 0;
1940 }
1941
1942 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1943                               struct drbd_nl_cfg_reply *reply)
1944 {
1945         reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1946
1947         return 0;
1948 }
1949
1950 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1951                              struct drbd_nl_cfg_reply *reply)
1952 {
1953         if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1954                 drbd_uuid_new_current(mdev);
1955                 clear_bit(NEW_CUR_UUID, &mdev->flags);
1956                 drbd_md_sync(mdev);
1957         }
1958         drbd_suspend_io(mdev);
1959         reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
1960         if (reply->ret_code == SS_SUCCESS) {
1961                 if (mdev->state.conn < C_CONNECTED)
1962                         tl_clear(mdev);
1963                 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
1964                         tl_restart(mdev, fail_frozen_disk_io);
1965         }
1966         drbd_resume_io(mdev);
1967
1968         return 0;
1969 }
1970
1971 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1972                            struct drbd_nl_cfg_reply *reply)
1973 {
1974         reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
1975         return 0;
1976 }
1977
1978 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1979                            struct drbd_nl_cfg_reply *reply)
1980 {
1981         unsigned short *tl;
1982
1983         tl = reply->tag_list;
1984
1985         if (get_ldev(mdev)) {
1986                 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
1987                 put_ldev(mdev);
1988         }
1989
1990         if (get_net_conf(mdev)) {
1991                 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
1992                 put_net_conf(mdev);
1993         }
1994         tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
1995
1996         put_unaligned(TT_END, tl++); /* Close the tag list */
1997
1998         return (int)((char *)tl - (char *)reply->tag_list);
1999 }
2000
2001 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2002                              struct drbd_nl_cfg_reply *reply)
2003 {
2004         unsigned short *tl = reply->tag_list;
2005         union drbd_state s = mdev->state;
2006         unsigned long rs_left;
2007         unsigned int res;
2008
2009         tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
2010
2011         /* no local ref, no bitmap, no syncer progress. */
2012         if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
2013                 if (get_ldev(mdev)) {
2014                         drbd_get_syncer_progress(mdev, &rs_left, &res);
2015                         tl = tl_add_int(tl, T_sync_progress, &res);
2016                         put_ldev(mdev);
2017                 }
2018         }
2019         put_unaligned(TT_END, tl++); /* Close the tag list */
2020
2021         return (int)((char *)tl - (char *)reply->tag_list);
2022 }
2023
2024 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2025                              struct drbd_nl_cfg_reply *reply)
2026 {
2027         unsigned short *tl;
2028
2029         tl = reply->tag_list;
2030
2031         if (get_ldev(mdev)) {
2032                 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
2033                 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
2034                 put_ldev(mdev);
2035         }
2036         put_unaligned(TT_END, tl++); /* Close the tag list */
2037
2038         return (int)((char *)tl - (char *)reply->tag_list);
2039 }
2040
2041 /**
2042  * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
2043  * @mdev:       DRBD device.
2044  * @nlp:        Netlink/connector packet from drbdsetup
2045  * @reply:      Reply packet for drbdsetup
2046  */
2047 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2048                                     struct drbd_nl_cfg_reply *reply)
2049 {
2050         unsigned short *tl;
2051         char rv;
2052
2053         tl = reply->tag_list;
2054
2055         rv = mdev->state.pdsk == D_OUTDATED        ? UT_PEER_OUTDATED :
2056           test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
2057
2058         tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
2059         put_unaligned(TT_END, tl++); /* Close the tag list */
2060
2061         return (int)((char *)tl - (char *)reply->tag_list);
2062 }
2063
2064 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2065                                     struct drbd_nl_cfg_reply *reply)
2066 {
2067         /* default to resume from last known position, if possible */
2068         struct start_ov args =
2069                 { .start_sector = mdev->ov_start_sector };
2070
2071         if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
2072                 reply->ret_code = ERR_MANDATORY_TAG;
2073                 return 0;
2074         }
2075         /* w_make_ov_request expects position to be aligned */
2076         mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
2077         reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2078         return 0;
2079 }
2080
2081
2082 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2083                               struct drbd_nl_cfg_reply *reply)
2084 {
2085         int retcode = NO_ERROR;
2086         int skip_initial_sync = 0;
2087         int err;
2088
2089         struct new_c_uuid args;
2090
2091         memset(&args, 0, sizeof(struct new_c_uuid));
2092         if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
2093                 reply->ret_code = ERR_MANDATORY_TAG;
2094                 return 0;
2095         }
2096
2097         mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
2098
2099         if (!get_ldev(mdev)) {
2100                 retcode = ERR_NO_DISK;
2101                 goto out;
2102         }
2103
2104         /* this is "skip initial sync", assume to be clean */
2105         if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
2106             mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2107                 dev_info(DEV, "Preparing to skip initial sync\n");
2108                 skip_initial_sync = 1;
2109         } else if (mdev->state.conn != C_STANDALONE) {
2110                 retcode = ERR_CONNECTED;
2111                 goto out_dec;
2112         }
2113
2114         drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2115         drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2116
2117         if (args.clear_bm) {
2118                 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
2119                 if (err) {
2120                         dev_err(DEV, "Writing bitmap failed with %d\n",err);
2121                         retcode = ERR_IO_MD_DISK;
2122                 }
2123                 if (skip_initial_sync) {
2124                         drbd_send_uuids_skip_initial_sync(mdev);
2125                         _drbd_uuid_set(mdev, UI_BITMAP, 0);
2126                         spin_lock_irq(&mdev->req_lock);
2127                         _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2128                                         CS_VERBOSE, NULL);
2129                         spin_unlock_irq(&mdev->req_lock);
2130                 }
2131         }
2132
2133         drbd_md_sync(mdev);
2134 out_dec:
2135         put_ldev(mdev);
2136 out:
2137         mutex_unlock(&mdev->state_mutex);
2138
2139         reply->ret_code = retcode;
2140         return 0;
2141 }
2142
2143 struct cn_handler_struct {
2144         int (*function)(struct drbd_conf *,
2145                          struct drbd_nl_cfg_req *,
2146                          struct drbd_nl_cfg_reply *);
2147         int reply_body_size;
2148 };
2149
2150 static struct cn_handler_struct cnd_table[] = {
2151         [ P_primary ]           = { &drbd_nl_primary,           0 },
2152         [ P_secondary ]         = { &drbd_nl_secondary,         0 },
2153         [ P_disk_conf ]         = { &drbd_nl_disk_conf,         0 },
2154         [ P_detach ]            = { &drbd_nl_detach,            0 },
2155         [ P_net_conf ]          = { &drbd_nl_net_conf,          0 },
2156         [ P_disconnect ]        = { &drbd_nl_disconnect,        0 },
2157         [ P_resize ]            = { &drbd_nl_resize,            0 },
2158         [ P_syncer_conf ]       = { &drbd_nl_syncer_conf,       0 },
2159         [ P_invalidate ]        = { &drbd_nl_invalidate,        0 },
2160         [ P_invalidate_peer ]   = { &drbd_nl_invalidate_peer,   0 },
2161         [ P_pause_sync ]        = { &drbd_nl_pause_sync,        0 },
2162         [ P_resume_sync ]       = { &drbd_nl_resume_sync,       0 },
2163         [ P_suspend_io ]        = { &drbd_nl_suspend_io,        0 },
2164         [ P_resume_io ]         = { &drbd_nl_resume_io,         0 },
2165         [ P_outdate ]           = { &drbd_nl_outdate,           0 },
2166         [ P_get_config ]        = { &drbd_nl_get_config,
2167                                     sizeof(struct syncer_conf_tag_len_struct) +
2168                                     sizeof(struct disk_conf_tag_len_struct) +
2169                                     sizeof(struct net_conf_tag_len_struct) },
2170         [ P_get_state ]         = { &drbd_nl_get_state,
2171                                     sizeof(struct get_state_tag_len_struct) +
2172                                     sizeof(struct sync_progress_tag_len_struct) },
2173         [ P_get_uuids ]         = { &drbd_nl_get_uuids,
2174                                     sizeof(struct get_uuids_tag_len_struct) },
2175         [ P_get_timeout_flag ]  = { &drbd_nl_get_timeout_flag,
2176                                     sizeof(struct get_timeout_flag_tag_len_struct)},
2177         [ P_start_ov ]          = { &drbd_nl_start_ov,          0 },
2178         [ P_new_c_uuid ]        = { &drbd_nl_new_c_uuid,        0 },
2179 };
2180
2181 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
2182 {
2183         struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2184         struct cn_handler_struct *cm;
2185         struct cn_msg *cn_reply;
2186         struct drbd_nl_cfg_reply *reply;
2187         struct drbd_conf *mdev;
2188         int retcode, rr;
2189         int reply_size = sizeof(struct cn_msg)
2190                 + sizeof(struct drbd_nl_cfg_reply)
2191                 + sizeof(short int);
2192
2193         if (!try_module_get(THIS_MODULE)) {
2194                 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2195                 return;
2196         }
2197
2198         if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) {
2199                 retcode = ERR_PERM;
2200                 goto fail;
2201         }
2202
2203         mdev = ensure_mdev(nlp->drbd_minor,
2204                         (nlp->flags & DRBD_NL_CREATE_DEVICE));
2205         if (!mdev) {
2206                 retcode = ERR_MINOR_INVALID;
2207                 goto fail;
2208         }
2209
2210         if (nlp->packet_type >= P_nl_after_last_packet) {
2211                 retcode = ERR_PACKET_NR;
2212                 goto fail;
2213         }
2214
2215         cm = cnd_table + nlp->packet_type;
2216
2217         /* This may happen if packet number is 0: */
2218         if (cm->function == NULL) {
2219                 retcode = ERR_PACKET_NR;
2220                 goto fail;
2221         }
2222
2223         reply_size += cm->reply_body_size;
2224
2225         /* allocation not in the IO path, cqueue thread context */
2226         cn_reply = kmalloc(reply_size, GFP_KERNEL);
2227         if (!cn_reply) {
2228                 retcode = ERR_NOMEM;
2229                 goto fail;
2230         }
2231         reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2232
2233         reply->packet_type =
2234                 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
2235         reply->minor = nlp->drbd_minor;
2236         reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2237         /* reply->tag_list; might be modified by cm->function. */
2238
2239         rr = cm->function(mdev, nlp, reply);
2240
2241         cn_reply->id = req->id;
2242         cn_reply->seq = req->seq;
2243         cn_reply->ack = req->ack  + 1;
2244         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2245         cn_reply->flags = 0;
2246
2247         rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2248         if (rr && rr != -ESRCH)
2249                 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2250
2251         kfree(cn_reply);
2252         module_put(THIS_MODULE);
2253         return;
2254  fail:
2255         drbd_nl_send_reply(req, retcode);
2256         module_put(THIS_MODULE);
2257 }
2258
2259 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2260
2261 static unsigned short *
2262 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2263         unsigned short len, int nul_terminated)
2264 {
2265         unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2266         len = (len < l) ? len :  l;
2267         put_unaligned(tag, tl++);
2268         put_unaligned(len, tl++);
2269         memcpy(tl, data, len);
2270         tl = (unsigned short*)((char*)tl + len);
2271         if (nul_terminated)
2272                 *((char*)tl - 1) = 0;
2273         return tl;
2274 }
2275
2276 static unsigned short *
2277 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2278 {
2279         return __tl_add_blob(tl, tag, data, len, 0);
2280 }
2281
2282 static unsigned short *
2283 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2284 {
2285         return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2286 }
2287
2288 static unsigned short *
2289 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2290 {
2291         put_unaligned(tag, tl++);
2292         switch(tag_type(tag)) {
2293         case TT_INTEGER:
2294                 put_unaligned(sizeof(int), tl++);
2295                 put_unaligned(*(int *)val, (int *)tl);
2296                 tl = (unsigned short*)((char*)tl+sizeof(int));
2297                 break;
2298         case TT_INT64:
2299                 put_unaligned(sizeof(u64), tl++);
2300                 put_unaligned(*(u64 *)val, (u64 *)tl);
2301                 tl = (unsigned short*)((char*)tl+sizeof(u64));
2302                 break;
2303         default:
2304                 /* someone did something stupid. */
2305                 ;
2306         }
2307         return tl;
2308 }
2309
2310 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2311 {
2312         char buffer[sizeof(struct cn_msg)+
2313                     sizeof(struct drbd_nl_cfg_reply)+
2314                     sizeof(struct get_state_tag_len_struct)+
2315                     sizeof(short int)];
2316         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2317         struct drbd_nl_cfg_reply *reply =
2318                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2319         unsigned short *tl = reply->tag_list;
2320
2321         /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2322
2323         tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2324
2325         put_unaligned(TT_END, tl++); /* Close the tag list */
2326
2327         cn_reply->id.idx = CN_IDX_DRBD;
2328         cn_reply->id.val = CN_VAL_DRBD;
2329
2330         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2331         cn_reply->ack = 0; /* not used here. */
2332         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2333                 (int)((char *)tl - (char *)reply->tag_list);
2334         cn_reply->flags = 0;
2335
2336         reply->packet_type = P_get_state;
2337         reply->minor = mdev_to_minor(mdev);
2338         reply->ret_code = NO_ERROR;
2339
2340         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2341 }
2342
2343 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2344 {
2345         char buffer[sizeof(struct cn_msg)+
2346                     sizeof(struct drbd_nl_cfg_reply)+
2347                     sizeof(struct call_helper_tag_len_struct)+
2348                     sizeof(short int)];
2349         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2350         struct drbd_nl_cfg_reply *reply =
2351                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2352         unsigned short *tl = reply->tag_list;
2353
2354         /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2355
2356         tl = tl_add_str(tl, T_helper, helper_name);
2357         put_unaligned(TT_END, tl++); /* Close the tag list */
2358
2359         cn_reply->id.idx = CN_IDX_DRBD;
2360         cn_reply->id.val = CN_VAL_DRBD;
2361
2362         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2363         cn_reply->ack = 0; /* not used here. */
2364         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2365                 (int)((char *)tl - (char *)reply->tag_list);
2366         cn_reply->flags = 0;
2367
2368         reply->packet_type = P_call_helper;
2369         reply->minor = mdev_to_minor(mdev);
2370         reply->ret_code = NO_ERROR;
2371
2372         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2373 }
2374
2375 void drbd_bcast_ee(struct drbd_conf *mdev,
2376                 const char *reason, const int dgs,
2377                 const char* seen_hash, const char* calc_hash,
2378                 const struct drbd_epoch_entry* e)
2379 {
2380         struct cn_msg *cn_reply;
2381         struct drbd_nl_cfg_reply *reply;
2382         unsigned short *tl;
2383         struct page *page;
2384         unsigned len;
2385
2386         if (!e)
2387                 return;
2388         if (!reason || !reason[0])
2389                 return;
2390
2391         /* apparently we have to memcpy twice, first to prepare the data for the
2392          * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2393          * netlink skb. */
2394         /* receiver thread context, which is not in the writeout path (of this node),
2395          * but may be in the writeout path of the _other_ node.
2396          * GFP_NOIO to avoid potential "distributed deadlock". */
2397         cn_reply = kmalloc(
2398                 sizeof(struct cn_msg)+
2399                 sizeof(struct drbd_nl_cfg_reply)+
2400                 sizeof(struct dump_ee_tag_len_struct)+
2401                 sizeof(short int),
2402                 GFP_NOIO);
2403
2404         if (!cn_reply) {
2405                 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2406                                 (unsigned long long)e->sector, e->size);
2407                 return;
2408         }
2409
2410         reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2411         tl = reply->tag_list;
2412
2413         tl = tl_add_str(tl, T_dump_ee_reason, reason);
2414         tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2415         tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2416         tl = tl_add_int(tl, T_ee_sector, &e->sector);
2417         tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2418
2419         put_unaligned(T_ee_data, tl++);
2420         put_unaligned(e->size, tl++);
2421
2422         len = e->size;
2423         page = e->pages;
2424         page_chain_for_each(page) {
2425                 void *d = kmap_atomic(page, KM_USER0);
2426                 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2427                 memcpy(tl, d, l);
2428                 kunmap_atomic(d, KM_USER0);
2429                 tl = (unsigned short*)((char*)tl + l);
2430                 len -= l;
2431         }
2432         put_unaligned(TT_END, tl++); /* Close the tag list */
2433
2434         cn_reply->id.idx = CN_IDX_DRBD;
2435         cn_reply->id.val = CN_VAL_DRBD;
2436
2437         cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2438         cn_reply->ack = 0; // not used here.
2439         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2440                 (int)((char*)tl - (char*)reply->tag_list);
2441         cn_reply->flags = 0;
2442
2443         reply->packet_type = P_dump_ee;
2444         reply->minor = mdev_to_minor(mdev);
2445         reply->ret_code = NO_ERROR;
2446
2447         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2448         kfree(cn_reply);
2449 }
2450
2451 void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2452 {
2453         char buffer[sizeof(struct cn_msg)+
2454                     sizeof(struct drbd_nl_cfg_reply)+
2455                     sizeof(struct sync_progress_tag_len_struct)+
2456                     sizeof(short int)];
2457         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2458         struct drbd_nl_cfg_reply *reply =
2459                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2460         unsigned short *tl = reply->tag_list;
2461         unsigned long rs_left;
2462         unsigned int res;
2463
2464         /* no local ref, no bitmap, no syncer progress, no broadcast. */
2465         if (!get_ldev(mdev))
2466                 return;
2467         drbd_get_syncer_progress(mdev, &rs_left, &res);
2468         put_ldev(mdev);
2469
2470         tl = tl_add_int(tl, T_sync_progress, &res);
2471         put_unaligned(TT_END, tl++); /* Close the tag list */
2472
2473         cn_reply->id.idx = CN_IDX_DRBD;
2474         cn_reply->id.val = CN_VAL_DRBD;
2475
2476         cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2477         cn_reply->ack = 0; /* not used here. */
2478         cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2479                 (int)((char *)tl - (char *)reply->tag_list);
2480         cn_reply->flags = 0;
2481
2482         reply->packet_type = P_sync_progress;
2483         reply->minor = mdev_to_minor(mdev);
2484         reply->ret_code = NO_ERROR;
2485
2486         cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2487 }
2488
2489 int __init drbd_nl_init(void)
2490 {
2491         static struct cb_id cn_id_drbd;
2492         int err, try=10;
2493
2494         cn_id_drbd.val = CN_VAL_DRBD;
2495         do {
2496                 cn_id_drbd.idx = cn_idx;
2497                 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2498                 if (!err)
2499                         break;
2500                 cn_idx = (cn_idx + CN_IDX_STEP);
2501         } while (try--);
2502
2503         if (err) {
2504                 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2505                 return err;
2506         }
2507
2508         return 0;
2509 }
2510
2511 void drbd_nl_cleanup(void)
2512 {
2513         static struct cb_id cn_id_drbd;
2514
2515         cn_id_drbd.idx = cn_idx;
2516         cn_id_drbd.val = CN_VAL_DRBD;
2517
2518         cn_del_callback(&cn_id_drbd);
2519 }
2520
2521 void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2522 {
2523         char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2524         struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2525         struct drbd_nl_cfg_reply *reply =
2526                 (struct drbd_nl_cfg_reply *)cn_reply->data;
2527         int rr;
2528
2529         cn_reply->id = req->id;
2530
2531         cn_reply->seq = req->seq;
2532         cn_reply->ack = req->ack  + 1;
2533         cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2534         cn_reply->flags = 0;
2535
2536         reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2537         reply->ret_code = ret_code;
2538
2539         rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2540         if (rr && rr != -ESRCH)
2541                 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2542 }
2543