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 218         case 4: /* peer got outdated, or was already outdated */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