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/blkpg.h>
  33 #include <linux/cpumask.h>
  34 #include "drbd_int.h"
  35 #include "drbd_req.h"
  36 #include "drbd_wrappers.h"
  37 #include <asm/unaligned.h>
  38 #include <linux/drbd_limits.h>
  39 #include <linux/kthread.h>
  40
  41 #include <net/genetlink.h>
  42
  43 /* .doit */
  44 // int drbd_adm_create_resource(struct sk_buff *skb, struct genl_info *info);
  45 // int drbd_adm_delete_resource(struct sk_buff *skb, struct genl_info *info);
  46
  47 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info);
  48 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info);
  49
  50 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info);
  51 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info);
  52 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info);
  53
  54 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info);
  55 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info);
  56 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info);
  57 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info);
  58 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info);
  59 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info);
  60 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info);
  61 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info);
  62 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info);
  63 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info);
  64 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info);
  65 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info);
  66 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info);
  67 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info);
  68 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info);
  69 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info);
  70 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info);
  71 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info);
  72 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info);
  73 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info);
  74 /* .dumpit */
  75 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb);
  76
  77 #include <linux/drbd_genl_api.h>
  78 #include "drbd_nla.h"
  79 #include <linux/genl_magic_func.h>
  80
  81 /* used blkdev_get_by_path, to claim our meta data device(s) */
  82 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
  83
  84 /* Configuration is strictly serialized, because generic netlink message
  85  * processing is strictly serialized by the genl_lock().
  86  * Which means we can use one static global drbd_config_context struct.
  87  */
  88 static struct drbd_config_context {
  89         /* assigned from drbd_genlmsghdr */
  90         unsigned int minor;
  91         /* assigned from request attributes, if present */
  92         unsigned int volume;
  93 #define VOLUME_UNSPECIFIED              (-1U)
  94         /* pointer into the request skb,
  95          * limited lifetime! */
  96         char *resource_name;
  97
  98         /* reply buffer */
  99         struct sk_buff *reply_skb;
 100         /* pointer into reply buffer */
 101         struct drbd_genlmsghdr *reply_dh;
 102         /* resolved from attributes, if possible */
 103         struct drbd_conf *mdev;
 104         struct drbd_tconn *tconn;
 105 } adm_ctx;
 106
 107 static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
 108 {
 109         genlmsg_end(skb, genlmsg_data(nlmsg_data(nlmsg_hdr(skb))));
 110         if (genlmsg_reply(skb, info))
 111                 printk(KERN_ERR "drbd: error sending genl reply\n");
 112 }
 113
 114 /* Used on a fresh "drbd_adm_prepare"d reply_skb, this cannot fail: The only
 115  * reason it could fail was no space in skb, and there are 4k available. */
 116 int drbd_msg_put_info(const char *info)
 117 {
 118         struct sk_buff *skb = adm_ctx.reply_skb;
 119         struct nlattr *nla;
 120         int err = -EMSGSIZE;
 121
 122         if (!info || !info[0])
 123                 return 0;
 124
 125         nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
 126         if (!nla)
 127                 return err;
 128
 129         err = nla_put_string(skb, T_info_text, info);
 130         if (err) {
 131                 nla_nest_cancel(skb, nla);
 132                 return err;
 133         } else
 134                 nla_nest_end(skb, nla);
 135         return 0;
 136 }
 137
 138 /* This would be a good candidate for a "pre_doit" hook,
 139  * and per-family private info->pointers.
 140  * But we need to stay compatible with older kernels.
 141  * If it returns successfully, adm_ctx members are valid.
 142  */
 143 #define DRBD_ADM_NEED_MINOR     1
 144 #define DRBD_ADM_NEED_CONN      2
 145 static int drbd_adm_prepare(struct sk_buff *skb, struct genl_info *info,
 146                 unsigned flags)
 147 {
 148         struct drbd_genlmsghdr *d_in = info->userhdr;
 149         const u8 cmd = info->genlhdr->cmd;
 150         int err;
 151
 152         memset(&adm_ctx, 0, sizeof(adm_ctx));
 153
 154         /* genl_rcv_msg only checks for CAP_NET_ADMIN on "GENL_ADMIN_PERM" :( */
 155         if (cmd != DRBD_ADM_GET_STATUS
 156         && security_netlink_recv(skb, CAP_SYS_ADMIN))
 157                return -EPERM;
 158
 159         adm_ctx.reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 160         if (!adm_ctx.reply_skb) {
 161                 err = -ENOMEM;
 162                 goto fail;
 163         }
 164
 165         adm_ctx.reply_dh = genlmsg_put_reply(adm_ctx.reply_skb,
 166                                         info, &drbd_genl_family, 0, cmd);
 167         /* put of a few bytes into a fresh skb of >= 4k will always succeed.
 168          * but anyways */
 169         if (!adm_ctx.reply_dh) {
 170                 err = -ENOMEM;
 171                 goto fail;
 172         }
 173
 174         adm_ctx.reply_dh->minor = d_in->minor;
 175         adm_ctx.reply_dh->ret_code = NO_ERROR;
 176
 177         if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
 178                 struct nlattr *nla;
 179                 /* parse and validate only */
 180                 err = drbd_cfg_context_from_attrs(NULL, info);
 181                 if (err)
 182                         goto fail;
 183
 184                 /* It was present, and valid,
 185                  * copy it over to the reply skb. */
 186                 err = nla_put_nohdr(adm_ctx.reply_skb,
 187                                 info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
 188                                 info->attrs[DRBD_NLA_CFG_CONTEXT]);
 189                 if (err)
 190                         goto fail;
 191
 192                 /* and assign stuff to the global adm_ctx */
 193                 nla = nested_attr_tb[__nla_type(T_ctx_volume)];
 194                 adm_ctx.volume = nla ? nla_get_u32(nla) : VOLUME_UNSPECIFIED;
 195                 nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
 196                 if (nla)
 197                         adm_ctx.resource_name = nla_data(nla);
 198         } else
 199                 adm_ctx.volume = VOLUME_UNSPECIFIED;
 200
 201         adm_ctx.minor = d_in->minor;
 202         adm_ctx.mdev = minor_to_mdev(d_in->minor);
 203         adm_ctx.tconn = conn_get_by_name(adm_ctx.resource_name);
 204
 205         if (!adm_ctx.mdev && (flags & DRBD_ADM_NEED_MINOR)) {
 206                 drbd_msg_put_info("unknown minor");
 207                 return ERR_MINOR_INVALID;
 208         }
 209         if (!adm_ctx.tconn && (flags & DRBD_ADM_NEED_CONN)) {
 210                 drbd_msg_put_info("unknown connection");
 211                 return ERR_INVALID_REQUEST;
 212         }
 213
 214         /* some more paranoia, if the request was over-determined */
 215         if (adm_ctx.mdev && adm_ctx.tconn &&
 216             adm_ctx.mdev->tconn != adm_ctx.tconn) {
 217                 pr_warning("request: minor=%u, conn=%s; but that minor belongs to connection %s\n",
 218                                 adm_ctx.minor, adm_ctx.resource_name,
 219                                 adm_ctx.mdev->tconn->name);
 220                 drbd_msg_put_info("minor exists in different connection");
 221                 return ERR_INVALID_REQUEST;
 222         }
 223         if (adm_ctx.mdev &&
 224             adm_ctx.volume != VOLUME_UNSPECIFIED &&
 225             adm_ctx.volume != adm_ctx.mdev->vnr) {
 226                 pr_warning("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
 227                                 adm_ctx.minor, adm_ctx.volume,
 228                                 adm_ctx.mdev->vnr, adm_ctx.mdev->tconn->name);
 229                 drbd_msg_put_info("minor exists as different volume");
 230                 return ERR_INVALID_REQUEST;
 231         }
 232
 233         return NO_ERROR;
 234
 235 fail:
 236         nlmsg_free(adm_ctx.reply_skb);
 237         adm_ctx.reply_skb = NULL;
 238         return err;
 239 }
 240
 241 static int drbd_adm_finish(struct genl_info *info, int retcode)
 242 {
 243         struct nlattr *nla;
 244         const char *resource_name = NULL;
 245
 246         if (adm_ctx.tconn) {
 247                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
 248                 adm_ctx.tconn = NULL;
 249         }
 250
 251         if (!adm_ctx.reply_skb)
 252                 return -ENOMEM;
 253
 254         adm_ctx.reply_dh->ret_code = retcode;
 255
 256         nla = info->attrs[DRBD_NLA_CFG_CONTEXT];
 257         if (nla) {
 258                 int maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
 259                 nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
 260                 if (nla && !IS_ERR(nla))
 261                         resource_name = nla_data(nla);
 262         }
 263
 264         drbd_adm_send_reply(adm_ctx.reply_skb, info);
 265         return 0;
 266 }
 267
 268 static void setup_khelper_env(struct drbd_tconn *tconn, char **envp)
 269 {
 270         char *afs;
 271         struct net_conf *nc;
 272
 273         rcu_read_lock();
 274         nc = rcu_dereference(tconn->net_conf);
 275         if (nc) {
 276                 switch (((struct sockaddr *)nc->peer_addr)->sa_family) {
 277                 case AF_INET6:
 278                         afs = "ipv6";
 279                         snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
 280                                  &((struct sockaddr_in6 *)nc->peer_addr)->sin6_addr);
 281                         break;
 282                 case AF_INET:
 283                         afs = "ipv4";
 284                         snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 285                                  &((struct sockaddr_in *)nc->peer_addr)->sin_addr);
 286                         break;
 287                 default:
 288                         afs = "ssocks";
 289                         snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 290                                  &((struct sockaddr_in *)nc->peer_addr)->sin_addr);
 291                 }
 292                 snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
 293         }
 294         rcu_read_unlock();
 295 }
 296
 297 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
 298 {
 299         char *envp[] = { "HOME=/",
 300                         "TERM=linux",
 301                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 302                          (char[20]) { }, /* address family */
 303                          (char[60]) { }, /* address */
 304                         NULL };
 305         char mb[12];
 306         char *argv[] = {usermode_helper, cmd, mb, NULL };
 307         struct sib_info sib;
 308         int ret;
 309
 310         snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
 311         setup_khelper_env(mdev->tconn, envp);
 312
 313         /* The helper may take some time.
 314          * write out any unsynced meta data changes now */
 315         drbd_md_sync(mdev);
 316
 317         dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
 318         sib.sib_reason = SIB_HELPER_PRE;
 319         sib.helper_name = cmd;
 320         drbd_bcast_event(mdev, &sib);
 321         ret = call_usermodehelper(usermode_helper, argv, envp, 1);
 322         if (ret)
 323                 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 324                                 usermode_helper, cmd, mb,
 325                                 (ret >> 8) & 0xff, ret);
 326         else
 327                 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 328                                 usermode_helper, cmd, mb,
 329                                 (ret >> 8) & 0xff, ret);
 330         sib.sib_reason = SIB_HELPER_POST;
 331         sib.helper_exit_code = ret;
 332         drbd_bcast_event(mdev, &sib);
 333
 334         if (ret < 0) /* Ignore any ERRNOs we got. */
 335                 ret = 0;
 336
 337         return ret;
 338 }
 339
 340 static void conn_md_sync(struct drbd_tconn *tconn)
 341 {
 342         struct drbd_conf *mdev;
 343         int vnr;
 344
 345         rcu_read_lock();
 346         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
 347                 kref_get(&mdev->kref);
 348                 rcu_read_unlock();
 349                 drbd_md_sync(mdev);
 350                 kref_put(&mdev->kref, &drbd_minor_destroy);
 351                 rcu_read_lock();
 352         }
 353         rcu_read_unlock();
 354 }
 355
 356 int conn_khelper(struct drbd_tconn *tconn, char *cmd)
 357 {
 358         char *envp[] = { "HOME=/",
 359                         "TERM=linux",
 360                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 361                          (char[20]) { }, /* address family */
 362                          (char[60]) { }, /* address */
 363                         NULL };
 364         char *argv[] = {usermode_helper, cmd, tconn->name, NULL };
 365         int ret;
 366
 367         setup_khelper_env(tconn, envp);
 368         conn_md_sync(tconn);
 369
 370         conn_info(tconn, "helper command: %s %s %s\n", usermode_helper, cmd, tconn->name);
 371         /* TODO: conn_bcast_event() ?? */
 372
 373         ret = call_usermodehelper(usermode_helper, argv, envp, 1);
 374         if (ret)
 375                 conn_warn(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 376                           usermode_helper, cmd, tconn->name,
 377                           (ret >> 8) & 0xff, ret);
 378         else
 379                 conn_info(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 380                           usermode_helper, cmd, tconn->name,
 381                           (ret >> 8) & 0xff, ret);
 382         /* TODO: conn_bcast_event() ?? */
 383
 384         if (ret < 0) /* Ignore any ERRNOs we got. */
 385                 ret = 0;
 386
 387         return ret;
 388 }
 389
 390 static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
 391 {
 392         enum drbd_fencing_p fp = FP_NOT_AVAIL;
 393         struct drbd_conf *mdev;
 394         int vnr;
 395
 396         rcu_read_lock();
 397         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
 398                 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
 399                         fp = max_t(enum drbd_fencing_p, fp,
 400                                    rcu_dereference(mdev->ldev->disk_conf)->fencing);
 401                         put_ldev(mdev);
 402                 }
 403         }
 404         rcu_read_unlock();
 405
 406         return fp;
 407 }
 408
 409 bool conn_try_outdate_peer(struct drbd_tconn *tconn)
 410 {
 411         union drbd_state mask = { };
 412         union drbd_state val = { };
 413         enum drbd_fencing_p fp;
 414         char *ex_to_string;
 415         int r;
 416
 417         if (tconn->cstate >= C_WF_REPORT_PARAMS) {
 418                 conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");
 419                 return false;
 420         }
 421
 422         fp = highest_fencing_policy(tconn);
 423         switch (fp) {
 424         case FP_NOT_AVAIL:
 425                 conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");
 426                 goto out;
 427         case FP_DONT_CARE:
 428                 return true;
 429         default: ;
 430         }
 431
 432         r = conn_khelper(tconn, "fence-peer");
 433
 434         switch ((r>>8) & 0xff) {
 435         case 3: /* peer is inconsistent */
 436                 ex_to_string = "peer is inconsistent or worse";
 437                 mask.pdsk = D_MASK;
 438                 val.pdsk = D_INCONSISTENT;
 439                 break;
 440         case 4: /* peer got outdated, or was already outdated */
 441                 ex_to_string = "peer was fenced";
 442                 mask.pdsk = D_MASK;
 443                 val.pdsk = D_OUTDATED;
 444                 break;
 445         case 5: /* peer was down */
 446                 if (conn_highest_disk(tconn) == D_UP_TO_DATE) {
 447                         /* we will(have) create(d) a new UUID anyways... */
 448                         ex_to_string = "peer is unreachable, assumed to be dead";
 449                         mask.pdsk = D_MASK;
 450                         val.pdsk = D_OUTDATED;
 451                 } else {
 452                         ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
 453                 }
 454                 break;
 455         case 6: /* Peer is primary, voluntarily outdate myself.
 456                  * This is useful when an unconnected R_SECONDARY is asked to
 457                  * become R_PRIMARY, but finds the other peer being active. */
 458                 ex_to_string = "peer is active";
 459                 conn_warn(tconn, "Peer is primary, outdating myself.\n");
 460                 mask.disk = D_MASK;
 461                 val.disk = D_OUTDATED;
 462                 break;
 463         case 7:
 464                 if (fp != FP_STONITH)
 465                         conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");
 466                 ex_to_string = "peer was stonithed";
 467                 mask.pdsk = D_MASK;
 468                 val.pdsk = D_OUTDATED;
 469                 break;
 470         default:
 471                 /* The script is broken ... */
 472                 conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
 473                 return false; /* Eventually leave IO frozen */
 474         }
 475
 476         conn_info(tconn, "fence-peer helper returned %d (%s)\n",
 477                   (r>>8) & 0xff, ex_to_string);
 478
 479  out:
 480
 481         /* Not using
 482            conn_request_state(tconn, mask, val, CS_VERBOSE);
 483            here, because we might were able to re-establish the connection in the
 484            meantime. */
 485         spin_lock_irq(&tconn->req_lock);
 486         if (tconn->cstate < C_WF_REPORT_PARAMS)
 487                 _conn_request_state(tconn, mask, val, CS_VERBOSE);
 488         spin_unlock_irq(&tconn->req_lock);
 489
 490         return conn_highest_pdsk(tconn) <= D_OUTDATED;
 491 }
 492
 493 static int _try_outdate_peer_async(void *data)
 494 {
 495         struct drbd_tconn *tconn = (struct drbd_tconn *)data;
 496
 497         conn_try_outdate_peer(tconn);
 498
 499         kref_put(&tconn->kref, &conn_destroy);
 500         return 0;
 501 }
 502
 503 void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
 504 {
 505         struct task_struct *opa;
 506
 507         kref_get(&tconn->kref);
 508         opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
 509         if (IS_ERR(opa)) {
 510                 conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
 511                 kref_put(&tconn->kref, &conn_destroy);
 512         }
 513 }
 514
 515 enum drbd_state_rv
 516 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
 517 {
 518         const int max_tries = 4;
 519         enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
 520         struct net_conf *nc;
 521         int try = 0;
 522         int forced = 0;
 523         union drbd_state mask, val;
 524
 525         if (new_role == R_PRIMARY)
 526                 request_ping(mdev->tconn); /* Detect a dead peer ASAP */
 527
 528         mutex_lock(mdev->state_mutex);
 529
 530         mask.i = 0; mask.role = R_MASK;
 531         val.i  = 0; val.role  = new_role;
 532
 533         while (try++ < max_tries) {
 534                 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
 535
 536                 /* in case we first succeeded to outdate,
 537                  * but now suddenly could establish a connection */
 538                 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
 539                         val.pdsk = 0;
 540                         mask.pdsk = 0;
 541                         continue;
 542                 }
 543
 544                 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
 545                     (mdev->state.disk < D_UP_TO_DATE &&
 546                      mdev->state.disk >= D_INCONSISTENT)) {
 547                         mask.disk = D_MASK;
 548                         val.disk  = D_UP_TO_DATE;
 549                         forced = 1;
 550                         continue;
 551                 }
 552
 553                 if (rv == SS_NO_UP_TO_DATE_DISK &&
 554                     mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
 555                         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 556
 557                         if (conn_try_outdate_peer(mdev->tconn)) {
 558                                 val.disk = D_UP_TO_DATE;
 559                                 mask.disk = D_MASK;
 560                         }
 561                         continue;
 562                 }
 563
 564                 if (rv == SS_NOTHING_TO_DO)
 565                         goto out;
 566                 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
 567                         if (!conn_try_outdate_peer(mdev->tconn) && force) {
 568                                 dev_warn(DEV, "Forced into split brain situation!\n");
 569                                 mask.pdsk = D_MASK;
 570                                 val.pdsk  = D_OUTDATED;
 571
 572                         }
 573                         continue;
 574                 }
 575                 if (rv == SS_TWO_PRIMARIES) {
 576                         /* Maybe the peer is detected as dead very soon...
 577                            retry at most once more in this case. */
 578                         int timeo;
 579                         rcu_read_lock();
 580                         nc = rcu_dereference(mdev->tconn->net_conf);
 581                         timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
 582                         rcu_read_unlock();
 583                         schedule_timeout_interruptible(timeo);
 584                         if (try < max_tries)
 585                                 try = max_tries - 1;
 586                         continue;
 587                 }
 588                 if (rv < SS_SUCCESS) {
 589                         rv = _drbd_request_state(mdev, mask, val,
 590                                                 CS_VERBOSE + CS_WAIT_COMPLETE);
 591                         if (rv < SS_SUCCESS)
 592                                 goto out;
 593                 }
 594                 break;
 595         }
 596
 597         if (rv < SS_SUCCESS)
 598                 goto out;
 599
 600         if (forced)
 601                 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
 602
 603         /* Wait until nothing is on the fly :) */
 604         wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
 605
 606         if (new_role == R_SECONDARY) {
 607                 set_disk_ro(mdev->vdisk, true);
 608                 if (get_ldev(mdev)) {
 609                         mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
 610                         put_ldev(mdev);
 611                 }
 612         } else {
 613                 mutex_lock(&mdev->tconn->conf_update);
 614                 nc = mdev->tconn->net_conf;
 615                 if (nc)
 616                         nc->discard_my_data = 0; /* without copy; single bit op is atomic */
 617                 mutex_unlock(&mdev->tconn->conf_update);
 618
 619                 set_disk_ro(mdev->vdisk, false);
 620                 if (get_ldev(mdev)) {
 621                         if (((mdev->state.conn < C_CONNECTED ||
 622                                mdev->state.pdsk <= D_FAILED)
 623                               && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
 624                                 drbd_uuid_new_current(mdev);
 625
 626                         mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
 627                         put_ldev(mdev);
 628                 }
 629         }
 630
 631         /* writeout of activity log covered areas of the bitmap
 632          * to stable storage done in after state change already */
 633
 634         if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
 635                 /* if this was forced, we should consider sync */
 636                 if (forced)
 637                         drbd_send_uuids(mdev);
 638                 drbd_send_state(mdev);
 639         }
 640
 641         drbd_md_sync(mdev);
 642
 643         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
 644 out:
 645         mutex_unlock(mdev->state_mutex);
 646         return rv;
 647 }
 648
 649 static const char *from_attrs_err_to_txt(int err)
 650 {
 651         return  err == -ENOMSG ? "required attribute missing" :
 652                 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
 653                 err == -EEXIST ? "can not change invariant setting" :
 654                 "invalid attribute value";
 655 }
 656
 657 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
 658 {
 659         struct set_role_parms parms;
 660         int err;
 661         enum drbd_ret_code retcode;
 662
 663         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
 664         if (!adm_ctx.reply_skb)
 665                 return retcode;
 666         if (retcode != NO_ERROR)
 667                 goto out;
 668
 669         memset(&parms, 0, sizeof(parms));
 670         if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
 671                 err = set_role_parms_from_attrs(&parms, info);
 672                 if (err) {
 673                         retcode = ERR_MANDATORY_TAG;
 674                         drbd_msg_put_info(from_attrs_err_to_txt(err));
 675                         goto out;
 676                 }
 677         }
 678
 679         if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
 680                 retcode = drbd_set_role(adm_ctx.mdev, R_PRIMARY, parms.assume_uptodate);
 681         else
 682                 retcode = drbd_set_role(adm_ctx.mdev, R_SECONDARY, 0);
 683 out:
 684         drbd_adm_finish(info, retcode);
 685         return 0;
 686 }
 687
 688 /* initializes the md.*_offset members, so we are able to find
 689  * the on disk meta data */
 690 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
 691                                        struct drbd_backing_dev *bdev)
 692 {
 693         sector_t md_size_sect = 0;
 694         int meta_dev_idx;
 695
 696         rcu_read_lock();
 697         meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
 698
 699         switch (meta_dev_idx) {
 700         default:
 701                 /* v07 style fixed size indexed meta data */
 702                 bdev->md.md_size_sect = MD_RESERVED_SECT;
 703                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 704                 bdev->md.al_offset = MD_AL_OFFSET;
 705                 bdev->md.bm_offset = MD_BM_OFFSET;
 706                 break;
 707         case DRBD_MD_INDEX_FLEX_EXT:
 708                 /* just occupy the full device; unit: sectors */
 709                 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
 710                 bdev->md.md_offset = 0;
 711                 bdev->md.al_offset = MD_AL_OFFSET;
 712                 bdev->md.bm_offset = MD_BM_OFFSET;
 713                 break;
 714         case DRBD_MD_INDEX_INTERNAL:
 715         case DRBD_MD_INDEX_FLEX_INT:
 716                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 717                 /* al size is still fixed */
 718                 bdev->md.al_offset = -MD_AL_SECTORS;
 719                 /* we need (slightly less than) ~ this much bitmap sectors: */
 720                 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
 721                 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
 722                 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
 723                 md_size_sect = ALIGN(md_size_sect, 8);
 724
 725                 /* plus the "drbd meta data super block",
 726                  * and the activity log; */
 727                 md_size_sect += MD_BM_OFFSET;
 728
 729                 bdev->md.md_size_sect = md_size_sect;
 730                 /* bitmap offset is adjusted by 'super' block size */
 731                 bdev->md.bm_offset   = -md_size_sect + MD_AL_OFFSET;
 732                 break;
 733         }
 734         rcu_read_unlock();
 735 }
 736
 737 /* input size is expected to be in KB */
 738 char *ppsize(char *buf, unsigned long long size)
 739 {
 740         /* Needs 9 bytes at max including trailing NUL:
 741          * -1ULL ==> "16384 EB" */
 742         static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
 743         int base = 0;
 744         while (size >= 10000 && base < sizeof(units)-1) {
 745                 /* shift + round */
 746                 size = (size >> 10) + !!(size & (1<<9));
 747                 base++;
 748         }
 749         sprintf(buf, "%u %cB", (unsigned)size, units[base]);
 750
 751         return buf;
 752 }
 753
 754 /* there is still a theoretical deadlock when called from receiver
 755  * on an D_INCONSISTENT R_PRIMARY:
 756  *  remote READ does inc_ap_bio, receiver would need to receive answer
 757  *  packet from remote to dec_ap_bio again.
 758  *  receiver receive_sizes(), comes here,
 759  *  waits for ap_bio_cnt == 0. -> deadlock.
 760  * but this cannot happen, actually, because:
 761  *  R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
 762  *  (not connected, or bad/no disk on peer):
 763  *  see drbd_fail_request_early, ap_bio_cnt is zero.
 764  *  R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
 765  *  peer may not initiate a resize.
 766  */
 767 /* Note these are not to be confused with
 768  * drbd_adm_suspend_io/drbd_adm_resume_io,
 769  * which are (sub) state changes triggered by admin (drbdsetup),
 770  * and can be long lived.
 771  * This changes an mdev->flag, is triggered by drbd internals,
 772  * and should be short-lived. */
 773 void drbd_suspend_io(struct drbd_conf *mdev)
 774 {
 775         set_bit(SUSPEND_IO, &mdev->flags);
 776         if (drbd_suspended(mdev))
 777                 return;
 778         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
 779 }
 780
 781 void drbd_resume_io(struct drbd_conf *mdev)
 782 {
 783         clear_bit(SUSPEND_IO, &mdev->flags);
 784         wake_up(&mdev->misc_wait);
 785 }
 786
 787 /**
 788  * drbd_determine_dev_size() -  Sets the right device size obeying all constraints
 789  * @mdev:       DRBD device.
 790  *
 791  * Returns 0 on success, negative return values indicate errors.
 792  * You should call drbd_md_sync() after calling this function.
 793  */
 794 enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
 795 {
 796         sector_t prev_first_sect, prev_size; /* previous meta location */
 797         sector_t la_size, u_size;
 798         sector_t size;
 799         char ppb[10];
 800
 801         int md_moved, la_size_changed;
 802         enum determine_dev_size rv = unchanged;
 803
 804         /* race:
 805          * application request passes inc_ap_bio,
 806          * but then cannot get an AL-reference.
 807          * this function later may wait on ap_bio_cnt == 0. -> deadlock.
 808          *
 809          * to avoid that:
 810          * Suspend IO right here.
 811          * still lock the act_log to not trigger ASSERTs there.
 812          */
 813         drbd_suspend_io(mdev);
 814
 815         /* no wait necessary anymore, actually we could assert that */
 816         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
 817
 818         prev_first_sect = drbd_md_first_sector(mdev->ldev);
 819         prev_size = mdev->ldev->md.md_size_sect;
 820         la_size = mdev->ldev->md.la_size_sect;
 821
 822         /* TODO: should only be some assert here, not (re)init... */
 823         drbd_md_set_sector_offsets(mdev, mdev->ldev);
 824
 825         rcu_read_lock();
 826         u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
 827         rcu_read_unlock();
 828         size = drbd_new_dev_size(mdev, mdev->ldev, u_size, flags & DDSF_FORCED);
 829
 830         if (drbd_get_capacity(mdev->this_bdev) != size ||
 831             drbd_bm_capacity(mdev) != size) {
 832                 int err;
 833                 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
 834                 if (unlikely(err)) {
 835                         /* currently there is only one error: ENOMEM! */
 836                         size = drbd_bm_capacity(mdev)>>1;
 837                         if (size == 0) {
 838                                 dev_err(DEV, "OUT OF MEMORY! "
 839                                     "Could not allocate bitmap!\n");
 840                         } else {
 841                                 dev_err(DEV, "BM resizing failed. "
 842                                     "Leaving size unchanged at size = %lu KB\n",
 843                                     (unsigned long)size);
 844                         }
 845                         rv = dev_size_error;
 846                 }
 847                 /* racy, see comments above. */
 848                 drbd_set_my_capacity(mdev, size);
 849                 mdev->ldev->md.la_size_sect = size;
 850                 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
 851                      (unsigned long long)size>>1);
 852         }
 853         if (rv == dev_size_error)
 854                 goto out;
 855
 856         la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
 857
 858         md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
 859                 || prev_size       != mdev->ldev->md.md_size_sect;
 860
 861         if (la_size_changed || md_moved) {
 862                 int err;
 863
 864                 drbd_al_shrink(mdev); /* All extents inactive. */
 865                 dev_info(DEV, "Writing the whole bitmap, %s\n",
 866                          la_size_changed && md_moved ? "size changed and md moved" :
 867                          la_size_changed ? "size changed" : "md moved");
 868                 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
 869                 err = drbd_bitmap_io(mdev, &drbd_bm_write,
 870                                 "size changed", BM_LOCKED_MASK);
 871                 if (err) {
 872                         rv = dev_size_error;
 873                         goto out;
 874                 }
 875                 drbd_md_mark_dirty(mdev);
 876         }
 877
 878         if (size > la_size)
 879                 rv = grew;
 880         if (size < la_size)
 881                 rv = shrunk;
 882 out:
 883         lc_unlock(mdev->act_log);
 884         wake_up(&mdev->al_wait);
 885         drbd_resume_io(mdev);
 886
 887         return rv;
 888 }
 889
 890 sector_t
 891 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
 892                   sector_t u_size, int assume_peer_has_space)
 893 {
 894         sector_t p_size = mdev->p_size;   /* partner's disk size. */
 895         sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
 896         sector_t m_size; /* my size */
 897         sector_t size = 0;
 898
 899         m_size = drbd_get_max_capacity(bdev);
 900
 901         if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
 902                 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
 903                 p_size = m_size;
 904         }
 905
 906         if (p_size && m_size) {
 907                 size = min_t(sector_t, p_size, m_size);
 908         } else {
 909                 if (la_size) {
 910                         size = la_size;
 911                         if (m_size && m_size < size)
 912                                 size = m_size;
 913                         if (p_size && p_size < size)
 914                                 size = p_size;
 915                 } else {
 916                         if (m_size)
 917                                 size = m_size;
 918                         if (p_size)
 919                                 size = p_size;
 920                 }
 921         }
 922
 923         if (size == 0)
 924                 dev_err(DEV, "Both nodes diskless!\n");
 925
 926         if (u_size) {
 927                 if (u_size > size)
 928                         dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
 929                             (unsigned long)u_size>>1, (unsigned long)size>>1);
 930                 else
 931                         size = u_size;
 932         }
 933
 934         return size;
 935 }
 936
 937 /**
 938  * drbd_check_al_size() - Ensures that the AL is of the right size
 939  * @mdev:       DRBD device.
 940  *
 941  * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
 942  * failed, and 0 on success. You should call drbd_md_sync() after you called
 943  * this function.
 944  */
 945 static int drbd_check_al_size(struct drbd_conf *mdev, struct disk_conf *dc)
 946 {
 947         struct lru_cache *n, *t;
 948         struct lc_element *e;
 949         unsigned int in_use;
 950         int i;
 951
 952         if (mdev->act_log &&
 953             mdev->act_log->nr_elements == dc->al_extents)
 954                 return 0;
 955
 956         in_use = 0;
 957         t = mdev->act_log;
 958         n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
 959                 dc->al_extents, sizeof(struct lc_element), 0);
 960
 961         if (n == NULL) {
 962                 dev_err(DEV, "Cannot allocate act_log lru!\n");
 963                 return -ENOMEM;
 964         }
 965         spin_lock_irq(&mdev->al_lock);
 966         if (t) {
 967                 for (i = 0; i < t->nr_elements; i++) {
 968                         e = lc_element_by_index(t, i);
 969                         if (e->refcnt)
 970                                 dev_err(DEV, "refcnt(%d)==%d\n",
 971                                     e->lc_number, e->refcnt);
 972                         in_use += e->refcnt;
 973                 }
 974         }
 975         if (!in_use)
 976                 mdev->act_log = n;
 977         spin_unlock_irq(&mdev->al_lock);
 978         if (in_use) {
 979                 dev_err(DEV, "Activity log still in use!\n");
 980                 lc_destroy(n);
 981                 return -EBUSY;
 982         } else {
 983                 if (t)
 984                         lc_destroy(t);
 985         }
 986         drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
 987         return 0;
 988 }
 989
 990 static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
 991 {
 992         struct request_queue * const q = mdev->rq_queue;
 993         int max_hw_sectors = max_bio_size >> 9;
 994         int max_segments = 0;
 995
 996         if (get_ldev_if_state(mdev, D_ATTACHING)) {
 997                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
 998
 999                 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
1000                 rcu_read_lock();
1001                 max_segments = rcu_dereference(mdev->ldev->disk_conf)->max_bio_bvecs;
1002                 rcu_read_unlock();
1003                 put_ldev(mdev);
1004         }
1005
1006         blk_queue_logical_block_size(q, 512);
1007         blk_queue_max_hw_sectors(q, max_hw_sectors);
1008         /* This is the workaround for "bio would need to, but cannot, be split" */
1009         blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1010         blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
1011
1012         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1013                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1014
1015                 blk_queue_stack_limits(q, b);
1016
1017                 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
1018                         dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
1019                                  q->backing_dev_info.ra_pages,
1020                                  b->backing_dev_info.ra_pages);
1021                         q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1022                 }
1023                 put_ldev(mdev);
1024         }
1025 }
1026
1027 void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
1028 {
1029         int now, new, local, peer;
1030
1031         now = queue_max_hw_sectors(mdev->rq_queue) << 9;
1032         local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
1033         peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
1034
1035         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1036                 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
1037                 mdev->local_max_bio_size = local;
1038                 put_ldev(mdev);
1039         }
1040
1041         /* We may ignore peer limits if the peer is modern enough.
1042            Because new from 8.3.8 onwards the peer can use multiple
1043            BIOs for a single peer_request */
1044         if (mdev->state.conn >= C_CONNECTED) {
1045                 if (mdev->tconn->agreed_pro_version < 94)
1046                         peer = mdev->peer_max_bio_size;
1047                 else if (mdev->tconn->agreed_pro_version == 94)
1048                         peer = DRBD_MAX_SIZE_H80_PACKET;
1049                 else /* drbd 8.3.8 onwards */
1050                         peer = DRBD_MAX_BIO_SIZE;
1051         }
1052
1053         new = min_t(int, local, peer);
1054
1055         if (mdev->state.role == R_PRIMARY && new < now)
1056                 dev_err(DEV, "ASSERT FAILED new < now; (%d < %d)\n", new, now);
1057
1058         if (new != now)
1059                 dev_info(DEV, "max BIO size = %u\n", new);
1060
1061         drbd_setup_queue_param(mdev, new);
1062 }
1063
1064 /* Starts the worker thread */
1065 static void conn_reconfig_start(struct drbd_tconn *tconn)
1066 {
1067         drbd_thread_start(&tconn->worker);
1068         conn_flush_workqueue(tconn);
1069 }
1070
1071 /* if still unconfigured, stops worker again. */
1072 static void conn_reconfig_done(struct drbd_tconn *tconn)
1073 {
1074         bool stop_threads;
1075         spin_lock_irq(&tconn->req_lock);
1076         stop_threads = conn_all_vols_unconf(tconn);
1077         spin_unlock_irq(&tconn->req_lock);
1078         if (stop_threads) {
1079                 /* asender is implicitly stopped by receiver
1080                  * in conn_disconnect() */
1081                 drbd_thread_stop(&tconn->receiver);
1082                 drbd_thread_stop(&tconn->worker);
1083         }
1084 }
1085
1086 /* Make sure IO is suspended before calling this function(). */
1087 static void drbd_suspend_al(struct drbd_conf *mdev)
1088 {
1089         int s = 0;
1090
1091         if (!lc_try_lock(mdev->act_log)) {
1092                 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
1093                 return;
1094         }
1095
1096         drbd_al_shrink(mdev);
1097         spin_lock_irq(&mdev->tconn->req_lock);
1098         if (mdev->state.conn < C_CONNECTED)
1099                 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
1100         spin_unlock_irq(&mdev->tconn->req_lock);
1101         lc_unlock(mdev->act_log);
1102
1103         if (s)
1104                 dev_info(DEV, "Suspended AL updates\n");
1105 }
1106
1107
1108 static bool should_set_defaults(struct genl_info *info)
1109 {
1110         unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1111         return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1112 }
1113
1114 static void enforce_disk_conf_limits(struct disk_conf *dc)
1115 {
1116         if (dc->al_extents < DRBD_AL_EXTENTS_MIN)
1117                 dc->al_extents = DRBD_AL_EXTENTS_MIN;
1118         if (dc->al_extents > DRBD_AL_EXTENTS_MAX)
1119                 dc->al_extents = DRBD_AL_EXTENTS_MAX;
1120
1121         if (dc->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1122                 dc->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1123 }
1124
1125 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1126 {
1127         enum drbd_ret_code retcode;
1128         struct drbd_conf *mdev;
1129         struct disk_conf *new_disk_conf, *old_disk_conf;
1130         struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
1131         int err, fifo_size;
1132
1133         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1134         if (!adm_ctx.reply_skb)
1135                 return retcode;
1136         if (retcode != NO_ERROR)
1137                 goto out;
1138
1139         mdev = adm_ctx.mdev;
1140
1141         /* we also need a disk
1142          * to change the options on */
1143         if (!get_ldev(mdev)) {
1144                 retcode = ERR_NO_DISK;
1145                 goto out;
1146         }
1147
1148         new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
1149         if (!new_disk_conf) {
1150                 retcode = ERR_NOMEM;
1151                 goto fail;
1152         }
1153
1154         mutex_lock(&mdev->tconn->conf_update);
1155         old_disk_conf = mdev->ldev->disk_conf;
1156         *new_disk_conf = *old_disk_conf;
1157         if (should_set_defaults(info))
1158                 set_disk_conf_defaults(new_disk_conf);
1159
1160         err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1161         if (err && err != -ENOMSG) {
1162                 retcode = ERR_MANDATORY_TAG;
1163                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1164         }
1165
1166         if (!expect(new_disk_conf->resync_rate >= 1))
1167                 new_disk_conf->resync_rate = 1;
1168
1169         enforce_disk_conf_limits(new_disk_conf);
1170
1171         fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1172         if (fifo_size != mdev->rs_plan_s->size) {
1173                 new_plan = fifo_alloc(fifo_size);
1174                 if (!new_plan) {
1175                         dev_err(DEV, "kmalloc of fifo_buffer failed");
1176                         retcode = ERR_NOMEM;
1177                         goto fail_unlock;
1178                 }
1179         }
1180
1181         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1182         drbd_al_shrink(mdev);
1183         err = drbd_check_al_size(mdev, new_disk_conf);
1184         lc_unlock(mdev->act_log);
1185         wake_up(&mdev->al_wait);
1186
1187         if (err) {
1188                 retcode = ERR_NOMEM;
1189                 goto fail_unlock;
1190         }
1191
1192         write_lock_irq(&global_state_lock);
1193         retcode = drbd_resync_after_valid(mdev, new_disk_conf->resync_after);
1194         if (retcode == NO_ERROR) {
1195                 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
1196                 drbd_resync_after_changed(mdev);
1197         }
1198         write_unlock_irq(&global_state_lock);
1199
1200         if (retcode != NO_ERROR)
1201                 goto fail_unlock;
1202
1203         if (new_plan) {
1204                 old_plan = mdev->rs_plan_s;
1205                 rcu_assign_pointer(mdev->rs_plan_s, new_plan);
1206         }
1207
1208         mutex_unlock(&mdev->tconn->conf_update);
1209         drbd_md_sync(mdev);
1210
1211         if (mdev->state.conn >= C_CONNECTED)
1212                 drbd_send_sync_param(mdev);
1213
1214         synchronize_rcu();
1215         kfree(old_disk_conf);
1216         kfree(old_plan);
1217         goto success;
1218
1219 fail_unlock:
1220         mutex_unlock(&mdev->tconn->conf_update);
1221  fail:
1222         kfree(new_disk_conf);
1223         kfree(new_plan);
1224 success:
1225         put_ldev(mdev);
1226  out:
1227         drbd_adm_finish(info, retcode);
1228         return 0;
1229 }
1230
1231 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1232 {
1233         struct drbd_conf *mdev;
1234         int err;
1235         enum drbd_ret_code retcode;
1236         enum determine_dev_size dd;
1237         sector_t max_possible_sectors;
1238         sector_t min_md_device_sectors;
1239         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1240         struct disk_conf *new_disk_conf = NULL;
1241         struct block_device *bdev;
1242         struct lru_cache *resync_lru = NULL;
1243         struct fifo_buffer *new_plan = NULL;
1244         union drbd_state ns, os;
1245         enum drbd_state_rv rv;
1246         struct net_conf *nc;
1247         int cp_discovered = 0;
1248
1249         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1250         if (!adm_ctx.reply_skb)
1251                 return retcode;
1252         if (retcode != NO_ERROR)
1253                 goto finish;
1254
1255         mdev = adm_ctx.mdev;
1256         conn_reconfig_start(mdev->tconn);
1257
1258         /* if you want to reconfigure, please tear down first */
1259         if (mdev->state.disk > D_DISKLESS) {
1260                 retcode = ERR_DISK_CONFIGURED;
1261                 goto fail;
1262         }
1263         /* It may just now have detached because of IO error.  Make sure
1264          * drbd_ldev_destroy is done already, we may end up here very fast,
1265          * e.g. if someone calls attach from the on-io-error handler,
1266          * to realize a "hot spare" feature (not that I'd recommend that) */
1267         wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1268
1269         /* allocation not in the IO path, drbdsetup context */
1270         nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1271         if (!nbc) {
1272                 retcode = ERR_NOMEM;
1273                 goto fail;
1274         }
1275         new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1276         if (!new_disk_conf) {
1277                 retcode = ERR_NOMEM;
1278                 goto fail;
1279         }
1280         nbc->disk_conf = new_disk_conf;
1281
1282         set_disk_conf_defaults(new_disk_conf);
1283         err = disk_conf_from_attrs(new_disk_conf, info);
1284         if (err) {
1285                 retcode = ERR_MANDATORY_TAG;
1286                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1287                 goto fail;
1288         }
1289
1290         enforce_disk_conf_limits(new_disk_conf);
1291
1292         new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1293         if (!new_plan) {
1294                 retcode = ERR_NOMEM;
1295                 goto fail;
1296         }
1297
1298         if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1299                 retcode = ERR_MD_IDX_INVALID;
1300                 goto fail;
1301         }
1302
1303         rcu_read_lock();
1304         nc = rcu_dereference(mdev->tconn->net_conf);
1305         if (nc) {
1306                 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1307                         rcu_read_unlock();
1308                         retcode = ERR_STONITH_AND_PROT_A;
1309                         goto fail;
1310                 }
1311         }
1312         rcu_read_unlock();
1313
1314         bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
1315                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
1316         if (IS_ERR(bdev)) {
1317                 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
1318                         PTR_ERR(bdev));
1319                 retcode = ERR_OPEN_DISK;
1320                 goto fail;
1321         }
1322         nbc->backing_bdev = bdev;
1323
1324         /*
1325          * meta_dev_idx >= 0: external fixed size, possibly multiple
1326          * drbd sharing one meta device.  TODO in that case, paranoia
1327          * check that [md_bdev, meta_dev_idx] is not yet used by some
1328          * other drbd minor!  (if you use drbd.conf + drbdadm, that
1329          * should check it for you already; but if you don't, or
1330          * someone fooled it, we need to double check here)
1331          */
1332         bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
1333                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1334                                   (new_disk_conf->meta_dev_idx < 0) ?
1335                                   (void *)mdev : (void *)drbd_m_holder);
1336         if (IS_ERR(bdev)) {
1337                 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
1338                         PTR_ERR(bdev));
1339                 retcode = ERR_OPEN_MD_DISK;
1340                 goto fail;
1341         }
1342         nbc->md_bdev = bdev;
1343
1344         if ((nbc->backing_bdev == nbc->md_bdev) !=
1345             (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1346              new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1347                 retcode = ERR_MD_IDX_INVALID;
1348                 goto fail;
1349         }
1350
1351         resync_lru = lc_create("resync", drbd_bm_ext_cache,
1352                         1, 61, sizeof(struct bm_extent),
1353                         offsetof(struct bm_extent, lce));
1354         if (!resync_lru) {
1355                 retcode = ERR_NOMEM;
1356                 goto fail;
1357         }
1358
1359         /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1360         drbd_md_set_sector_offsets(mdev, nbc);
1361
1362         if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
1363                 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1364                         (unsigned long long) drbd_get_max_capacity(nbc),
1365                         (unsigned long long) new_disk_conf->disk_size);
1366                 retcode = ERR_DISK_TOO_SMALL;
1367                 goto fail;
1368         }
1369
1370         if (new_disk_conf->meta_dev_idx < 0) {
1371                 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1372                 /* at least one MB, otherwise it does not make sense */
1373                 min_md_device_sectors = (2<<10);
1374         } else {
1375                 max_possible_sectors = DRBD_MAX_SECTORS;
1376                 min_md_device_sectors = MD_RESERVED_SECT * (new_disk_conf->meta_dev_idx + 1);
1377         }
1378
1379         if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1380                 retcode = ERR_MD_DISK_TOO_SMALL;
1381                 dev_warn(DEV, "refusing attach: md-device too small, "
1382                      "at least %llu sectors needed for this meta-disk type\n",
1383                      (unsigned long long) min_md_device_sectors);
1384                 goto fail;
1385         }
1386
1387         /* Make sure the new disk is big enough
1388          * (we may currently be R_PRIMARY with no local disk...) */
1389         if (drbd_get_max_capacity(nbc) <
1390             drbd_get_capacity(mdev->this_bdev)) {
1391                 retcode = ERR_DISK_TOO_SMALL;
1392                 goto fail;
1393         }
1394
1395         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1396
1397         if (nbc->known_size > max_possible_sectors) {
1398                 dev_warn(DEV, "==> truncating very big lower level device "
1399                         "to currently maximum possible %llu sectors <==\n",
1400                         (unsigned long long) max_possible_sectors);
1401                 if (new_disk_conf->meta_dev_idx >= 0)
1402                         dev_warn(DEV, "==>> using internal or flexible "
1403                                       "meta data may help <<==\n");
1404         }
1405
1406         drbd_suspend_io(mdev);
1407         /* also wait for the last barrier ack. */
1408         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || drbd_suspended(mdev));
1409         /* and for any other previously queued work */
1410         drbd_flush_workqueue(mdev);
1411
1412         rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1413         retcode = rv;  /* FIXME: Type mismatch. */
1414         drbd_resume_io(mdev);
1415         if (rv < SS_SUCCESS)
1416                 goto fail;
1417
1418         if (!get_ldev_if_state(mdev, D_ATTACHING))
1419                 goto force_diskless;
1420
1421         drbd_md_set_sector_offsets(mdev, nbc);
1422
1423         if (!mdev->bitmap) {
1424                 if (drbd_bm_init(mdev)) {
1425                         retcode = ERR_NOMEM;
1426                         goto force_diskless_dec;
1427                 }
1428         }
1429
1430         retcode = drbd_md_read(mdev, nbc);
1431         if (retcode != NO_ERROR)
1432                 goto force_diskless_dec;
1433
1434         if (mdev->state.conn < C_CONNECTED &&
1435             mdev->state.role == R_PRIMARY &&
1436             (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1437                 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1438                     (unsigned long long)mdev->ed_uuid);
1439                 retcode = ERR_DATA_NOT_CURRENT;
1440                 goto force_diskless_dec;
1441         }
1442
1443         /* Since we are diskless, fix the activity log first... */
1444         if (drbd_check_al_size(mdev, new_disk_conf)) {
1445                 retcode = ERR_NOMEM;
1446                 goto force_diskless_dec;
1447         }
1448
1449         /* Prevent shrinking of consistent devices ! */
1450         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1451             drbd_new_dev_size(mdev, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
1452                 dev_warn(DEV, "refusing to truncate a consistent device\n");
1453                 retcode = ERR_DISK_TOO_SMALL;
1454                 goto force_diskless_dec;
1455         }
1456
1457         if (!drbd_al_read_log(mdev, nbc)) {
1458                 retcode = ERR_IO_MD_DISK;
1459                 goto force_diskless_dec;
1460         }
1461
1462         /* Reset the "barriers don't work" bits here, then force meta data to
1463          * be written, to ensure we determine if barriers are supported. */
1464         if (new_disk_conf->md_flushes)
1465                 clear_bit(MD_NO_FUA, &mdev->flags);
1466         else
1467                 set_bit(MD_NO_FUA, &mdev->flags);
1468
1469         /* Point of no return reached.
1470          * Devices and memory are no longer released by error cleanup below.
1471          * now mdev takes over responsibility, and the state engine should
1472          * clean it up somewhere.  */
1473         D_ASSERT(mdev->ldev == NULL);
1474         mdev->ldev = nbc;
1475         mdev->resync = resync_lru;
1476         mdev->rs_plan_s = new_plan;
1477         nbc = NULL;
1478         resync_lru = NULL;
1479         new_disk_conf = NULL;
1480         new_plan = NULL;
1481
1482         mdev->write_ordering = WO_bdev_flush;
1483         drbd_bump_write_ordering(mdev, WO_bdev_flush);
1484
1485         if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1486                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1487         else
1488                 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1489
1490         if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1491             !(mdev->state.role == R_PRIMARY && mdev->tconn->susp_nod)) {
1492                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1493                 cp_discovered = 1;
1494         }
1495
1496         mdev->send_cnt = 0;
1497         mdev->recv_cnt = 0;
1498         mdev->read_cnt = 0;
1499         mdev->writ_cnt = 0;
1500
1501         drbd_reconsider_max_bio_size(mdev);
1502
1503         /* If I am currently not R_PRIMARY,
1504          * but meta data primary indicator is set,
1505          * I just now recover from a hard crash,
1506          * and have been R_PRIMARY before that crash.
1507          *
1508          * Now, if I had no connection before that crash
1509          * (have been degraded R_PRIMARY), chances are that
1510          * I won't find my peer now either.
1511          *
1512          * In that case, and _only_ in that case,
1513          * we use the degr-wfc-timeout instead of the default,
1514          * so we can automatically recover from a crash of a
1515          * degraded but active "cluster" after a certain timeout.
1516          */
1517         clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1518         if (mdev->state.role != R_PRIMARY &&
1519              drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1520             !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1521                 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1522
1523         dd = drbd_determine_dev_size(mdev, 0);
1524         if (dd == dev_size_error) {
1525                 retcode = ERR_NOMEM_BITMAP;
1526                 goto force_diskless_dec;
1527         } else if (dd == grew)
1528                 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1529
1530         if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1531                 dev_info(DEV, "Assuming that all blocks are out of sync "
1532                      "(aka FullSync)\n");
1533                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1534                         "set_n_write from attaching", BM_LOCKED_MASK)) {
1535                         retcode = ERR_IO_MD_DISK;
1536                         goto force_diskless_dec;
1537                 }
1538         } else {
1539                 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1540                         "read from attaching", BM_LOCKED_MASK)) {
1541                         retcode = ERR_IO_MD_DISK;
1542                         goto force_diskless_dec;
1543                 }
1544         }
1545
1546         if (cp_discovered) {
1547                 drbd_al_apply_to_bm(mdev);
1548                 if (drbd_bitmap_io(mdev, &drbd_bm_write,
1549                         "crashed primary apply AL", BM_LOCKED_MASK)) {
1550                         retcode = ERR_IO_MD_DISK;
1551                         goto force_diskless_dec;
1552                 }
1553         }
1554
1555         if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1556                 drbd_suspend_al(mdev); /* IO is still suspended here... */
1557
1558         spin_lock_irq(&mdev->tconn->req_lock);
1559         os = drbd_read_state(mdev);
1560         ns = os;
1561         /* If MDF_CONSISTENT is not set go into inconsistent state,
1562            otherwise investigate MDF_WasUpToDate...
1563            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1564            otherwise into D_CONSISTENT state.
1565         */
1566         if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1567                 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1568                         ns.disk = D_CONSISTENT;
1569                 else
1570                         ns.disk = D_OUTDATED;
1571         } else {
1572                 ns.disk = D_INCONSISTENT;
1573         }
1574
1575         if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1576                 ns.pdsk = D_OUTDATED;
1577
1578         rcu_read_lock();
1579         if (ns.disk == D_CONSISTENT &&
1580             (ns.pdsk == D_OUTDATED || rcu_dereference(mdev->ldev->disk_conf)->fencing == FP_DONT_CARE))
1581                 ns.disk = D_UP_TO_DATE;
1582         rcu_read_unlock();
1583
1584         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1585            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1586            this point, because drbd_request_state() modifies these
1587            flags. */
1588
1589         /* In case we are C_CONNECTED postpone any decision on the new disk
1590            state after the negotiation phase. */
1591         if (mdev->state.conn == C_CONNECTED) {
1592                 mdev->new_state_tmp.i = ns.i;
1593                 ns.i = os.i;
1594                 ns.disk = D_NEGOTIATING;
1595
1596                 /* We expect to receive up-to-date UUIDs soon.
1597                    To avoid a race in receive_state, free p_uuid while
1598                    holding req_lock. I.e. atomic with the state change */
1599                 kfree(mdev->p_uuid);
1600                 mdev->p_uuid = NULL;
1601         }
1602
1603         rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1604         spin_unlock_irq(&mdev->tconn->req_lock);
1605
1606         if (rv < SS_SUCCESS)
1607                 goto force_diskless_dec;
1608
1609         if (mdev->state.role == R_PRIMARY)
1610                 mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1611         else
1612                 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1613
1614         drbd_md_mark_dirty(mdev);
1615         drbd_md_sync(mdev);
1616
1617         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1618         put_ldev(mdev);
1619         conn_reconfig_done(mdev->tconn);
1620         drbd_adm_finish(info, retcode);
1621         return 0;
1622
1623  force_diskless_dec:
1624         put_ldev(mdev);
1625  force_diskless:
1626         drbd_force_state(mdev, NS(disk, D_FAILED));
1627         drbd_md_sync(mdev);
1628  fail:
1629         conn_reconfig_done(mdev->tconn);
1630         if (nbc) {
1631                 if (nbc->backing_bdev)
1632                         blkdev_put(nbc->backing_bdev,
1633                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1634                 if (nbc->md_bdev)
1635                         blkdev_put(nbc->md_bdev,
1636                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1637                 kfree(nbc);
1638         }
1639         kfree(new_disk_conf);
1640         lc_destroy(resync_lru);
1641         kfree(new_plan);
1642
1643  finish:
1644         drbd_adm_finish(info, retcode);
1645         return 0;
1646 }
1647
1648 static int adm_detach(struct drbd_conf *mdev)
1649 {
1650         enum drbd_state_rv retcode;
1651         int ret;
1652         drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1653         retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1654         /* D_FAILED will transition to DISKLESS. */
1655         ret = wait_event_interruptible(mdev->misc_wait,
1656                         mdev->state.disk != D_FAILED);
1657         drbd_resume_io(mdev);
1658         if ((int)retcode == (int)SS_IS_DISKLESS)
1659                 retcode = SS_NOTHING_TO_DO;
1660         if (ret)
1661                 retcode = ERR_INTR;
1662         return retcode;
1663 }
1664
1665 /* Detaching the disk is a process in multiple stages.  First we need to lock
1666  * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1667  * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1668  * internal references as well.
1669  * Only then we have finally detached. */
1670 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
1671 {
1672         enum drbd_ret_code retcode;
1673
1674         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1675         if (!adm_ctx.reply_skb)
1676                 return retcode;
1677         if (retcode != NO_ERROR)
1678                 goto out;
1679
1680         retcode = adm_detach(adm_ctx.mdev);
1681 out:
1682         drbd_adm_finish(info, retcode);
1683         return 0;
1684 }
1685
1686 static bool conn_resync_running(struct drbd_tconn *tconn)
1687 {
1688         struct drbd_conf *mdev;
1689         bool rv = false;
1690         int vnr;
1691
1692         rcu_read_lock();
1693         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1694                 if (mdev->state.conn == C_SYNC_SOURCE ||
1695                     mdev->state.conn == C_SYNC_TARGET ||
1696                     mdev->state.conn == C_PAUSED_SYNC_S ||
1697                     mdev->state.conn == C_PAUSED_SYNC_T) {
1698                         rv = true;
1699                         break;
1700                 }
1701         }
1702         rcu_read_unlock();
1703
1704         return rv;
1705 }
1706
1707 static bool conn_ov_running(struct drbd_tconn *tconn)
1708 {
1709         struct drbd_conf *mdev;
1710         bool rv = false;
1711         int vnr;
1712
1713         rcu_read_lock();
1714         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1715                 if (mdev->state.conn == C_VERIFY_S ||
1716                     mdev->state.conn == C_VERIFY_T) {
1717                         rv = true;
1718                         break;
1719                 }
1720         }
1721         rcu_read_unlock();
1722
1723         return rv;
1724 }
1725
1726 static enum drbd_ret_code
1727 _check_net_options(struct drbd_tconn *tconn, struct net_conf *old_conf, struct net_conf *new_conf)
1728 {
1729         struct drbd_conf *mdev;
1730         int i;
1731
1732         if (old_conf && tconn->cstate == C_WF_REPORT_PARAMS && tconn->agreed_pro_version < 100) {
1733                 if (new_conf->wire_protocol != old_conf->wire_protocol)
1734                         return ERR_NEED_APV_100;
1735
1736                 if (new_conf->two_primaries != old_conf->two_primaries)
1737                         return ERR_NEED_APV_100;
1738
1739                 if (!new_conf->integrity_alg != !old_conf->integrity_alg)
1740                         return ERR_NEED_APV_100;
1741
1742                 if (strcmp(new_conf->integrity_alg, old_conf->integrity_alg))
1743                         return ERR_NEED_APV_100;
1744         }
1745
1746         if (!new_conf->two_primaries &&
1747             conn_highest_role(tconn) == R_PRIMARY &&
1748             conn_highest_peer(tconn) == R_PRIMARY)
1749                 return ERR_NEED_ALLOW_TWO_PRI;
1750
1751         if (new_conf->two_primaries &&
1752             (new_conf->wire_protocol != DRBD_PROT_C))
1753                 return ERR_NOT_PROTO_C;
1754
1755         idr_for_each_entry(&tconn->volumes, mdev, i) {
1756                 if (get_ldev(mdev)) {
1757                         enum drbd_fencing_p fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
1758                         put_ldev(mdev);
1759                         if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
1760                                 return ERR_STONITH_AND_PROT_A;
1761                 }
1762                 if (mdev->state.role == R_PRIMARY && new_conf->discard_my_data)
1763                         return ERR_DISCARD;
1764         }
1765
1766         if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A)
1767                 return ERR_CONG_NOT_PROTO_A;
1768
1769         return NO_ERROR;
1770 }
1771
1772 static enum drbd_ret_code
1773 check_net_options(struct drbd_tconn *tconn, struct net_conf *new_conf)
1774 {
1775         static enum drbd_ret_code rv;
1776         struct drbd_conf *mdev;
1777         int i;
1778
1779         rcu_read_lock();
1780         rv = _check_net_options(tconn, rcu_dereference(tconn->net_conf), new_conf);
1781         rcu_read_unlock();
1782
1783         /* tconn->volumes protected by genl_lock() here */
1784         idr_for_each_entry(&tconn->volumes, mdev, i) {
1785                 if (!mdev->bitmap) {
1786                         if(drbd_bm_init(mdev))
1787                                 return ERR_NOMEM;
1788                 }
1789         }
1790
1791         return rv;
1792 }
1793
1794 struct crypto {
1795         struct crypto_hash *verify_tfm;
1796         struct crypto_hash *csums_tfm;
1797         struct crypto_hash *cram_hmac_tfm;
1798         struct crypto_hash *integrity_tfm;
1799         void *int_dig_in;
1800         void *int_dig_vv;
1801 };
1802
1803 static int
1804 alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
1805 {
1806         if (!tfm_name[0])
1807                 return NO_ERROR;
1808
1809         *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
1810         if (IS_ERR(*tfm)) {
1811                 *tfm = NULL;
1812                 return err_alg;
1813         }
1814
1815         return NO_ERROR;
1816 }
1817
1818 static enum drbd_ret_code
1819 alloc_crypto(struct crypto *crypto, struct net_conf *new_conf)
1820 {
1821         char hmac_name[CRYPTO_MAX_ALG_NAME];
1822         enum drbd_ret_code rv;
1823         int hash_size;
1824
1825         rv = alloc_hash(&crypto->csums_tfm, new_conf->csums_alg,
1826                        ERR_CSUMS_ALG);
1827         if (rv != NO_ERROR)
1828                 return rv;
1829         rv = alloc_hash(&crypto->verify_tfm, new_conf->verify_alg,
1830                        ERR_VERIFY_ALG);
1831         if (rv != NO_ERROR)
1832                 return rv;
1833         rv = alloc_hash(&crypto->integrity_tfm, new_conf->integrity_alg,
1834                        ERR_INTEGRITY_ALG);
1835         if (rv != NO_ERROR)
1836                 return rv;
1837         if (new_conf->cram_hmac_alg[0] != 0) {
1838                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1839                          new_conf->cram_hmac_alg);
1840
1841                 rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
1842                                ERR_AUTH_ALG);
1843         }
1844         if (crypto->integrity_tfm) {
1845                 hash_size = crypto_hash_digestsize(crypto->integrity_tfm);
1846                 crypto->int_dig_in = kmalloc(hash_size, GFP_KERNEL);
1847                 if (!crypto->int_dig_in)
1848                         return ERR_NOMEM;
1849                 crypto->int_dig_vv = kmalloc(hash_size, GFP_KERNEL);
1850                 if (!crypto->int_dig_vv)
1851                         return ERR_NOMEM;
1852         }
1853
1854         return rv;
1855 }
1856
1857 static void free_crypto(struct crypto *crypto)
1858 {
1859         kfree(crypto->int_dig_in);
1860         kfree(crypto->int_dig_vv);
1861         crypto_free_hash(crypto->cram_hmac_tfm);
1862         crypto_free_hash(crypto->integrity_tfm);
1863         crypto_free_hash(crypto->csums_tfm);
1864         crypto_free_hash(crypto->verify_tfm);
1865 }
1866
1867 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
1868 {
1869         enum drbd_ret_code retcode;
1870         struct drbd_tconn *tconn;
1871         struct net_conf *old_conf, *new_conf = NULL;
1872         int err;
1873         int ovr; /* online verify running */
1874         int rsr; /* re-sync running */
1875         struct crypto crypto = { };
1876
1877         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
1878         if (!adm_ctx.reply_skb)
1879                 return retcode;
1880         if (retcode != NO_ERROR)
1881                 goto out;
1882
1883         tconn = adm_ctx.tconn;
1884
1885         new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1886         if (!new_conf) {
1887                 retcode = ERR_NOMEM;
1888                 goto out;
1889         }
1890
1891         conn_reconfig_start(tconn);
1892
1893         mutex_lock(&tconn->data.mutex);
1894         mutex_lock(&tconn->conf_update);
1895         old_conf = tconn->net_conf;
1896
1897         if (!old_conf) {
1898                 drbd_msg_put_info("net conf missing, try connect");
1899                 retcode = ERR_INVALID_REQUEST;
1900                 goto fail;
1901         }
1902
1903         *new_conf = *old_conf;
1904         if (should_set_defaults(info))
1905                 set_net_conf_defaults(new_conf);
1906
1907         err = net_conf_from_attrs_for_change(new_conf, info);
1908         if (err && err != -ENOMSG) {
1909                 retcode = ERR_MANDATORY_TAG;
1910                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1911                 goto fail;
1912         }
1913
1914         retcode = check_net_options(tconn, new_conf);
1915         if (retcode != NO_ERROR)
1916                 goto fail;
1917
1918         /* re-sync running */
1919         rsr = conn_resync_running(tconn);
1920         if (rsr && strcmp(new_conf->csums_alg, old_conf->csums_alg)) {
1921                 retcode = ERR_CSUMS_RESYNC_RUNNING;
1922                 goto fail;
1923         }
1924
1925         /* online verify running */
1926         ovr = conn_ov_running(tconn);
1927         if (ovr && strcmp(new_conf->verify_alg, old_conf->verify_alg)) {
1928                 retcode = ERR_VERIFY_RUNNING;
1929                 goto fail;
1930         }
1931
1932         retcode = alloc_crypto(&crypto, new_conf);
1933         if (retcode != NO_ERROR)
1934                 goto fail;
1935
1936         rcu_assign_pointer(tconn->net_conf, new_conf);
1937
1938         if (!rsr) {
1939                 crypto_free_hash(tconn->csums_tfm);
1940                 tconn->csums_tfm = crypto.csums_tfm;
1941                 crypto.csums_tfm = NULL;
1942         }
1943         if (!ovr) {
1944                 crypto_free_hash(tconn->verify_tfm);
1945                 tconn->verify_tfm = crypto.verify_tfm;
1946                 crypto.verify_tfm = NULL;
1947         }
1948
1949         kfree(tconn->int_dig_in);
1950         tconn->int_dig_in = crypto.int_dig_in;
1951         kfree(tconn->int_dig_vv);
1952         tconn->int_dig_vv = crypto.int_dig_vv;
1953         crypto_free_hash(tconn->integrity_tfm);
1954         tconn->integrity_tfm = crypto.integrity_tfm;
1955         if (tconn->cstate >= C_WF_REPORT_PARAMS && tconn->agreed_pro_version >= 100)
1956                 /* Do this without trying to take tconn->data.mutex again.  */
1957                 __drbd_send_protocol(tconn, P_PROTOCOL_UPDATE);
1958
1959         crypto_free_hash(tconn->cram_hmac_tfm);
1960         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
1961
1962         mutex_unlock(&tconn->conf_update);
1963         mutex_unlock(&tconn->data.mutex);
1964         synchronize_rcu();
1965         kfree(old_conf);
1966
1967         if (tconn->cstate >= C_WF_REPORT_PARAMS)
1968                 drbd_send_sync_param(minor_to_mdev(conn_lowest_minor(tconn)));
1969
1970         goto done;
1971
1972  fail:
1973         mutex_unlock(&tconn->conf_update);
1974         mutex_unlock(&tconn->data.mutex);
1975         free_crypto(&crypto);
1976         kfree(new_conf);
1977  done:
1978         conn_reconfig_done(tconn);
1979  out:
1980         drbd_adm_finish(info, retcode);
1981         return 0;
1982 }
1983
1984 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
1985 {
1986         struct drbd_conf *mdev;
1987         struct net_conf *old_conf, *new_conf = NULL;
1988         struct crypto crypto = { };
1989         struct drbd_tconn *oconn;
1990         struct drbd_tconn *tconn;
1991         struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1992         enum drbd_ret_code retcode;
1993         int i;
1994         int err;
1995
1996         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
1997         if (!adm_ctx.reply_skb)
1998                 return retcode;
1999         if (retcode != NO_ERROR)
2000                 goto out;
2001
2002         tconn = adm_ctx.tconn;
2003         conn_reconfig_start(tconn);
2004
2005         if (tconn->cstate > C_STANDALONE) {
2006                 retcode = ERR_NET_CONFIGURED;
2007                 goto fail;
2008         }
2009
2010         /* allocation not in the IO path, cqueue thread context */
2011         new_conf = kzalloc(sizeof(*new_conf), GFP_KERNEL);
2012         if (!new_conf) {
2013                 retcode = ERR_NOMEM;
2014                 goto fail;
2015         }
2016
2017         set_net_conf_defaults(new_conf);
2018
2019         err = net_conf_from_attrs(new_conf, info);
2020         if (err) {
2021                 retcode = ERR_MANDATORY_TAG;
2022                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2023                 goto fail;
2024         }
2025
2026         retcode = check_net_options(tconn, new_conf);
2027         if (retcode != NO_ERROR)
2028                 goto fail;
2029
2030         retcode = NO_ERROR;
2031
2032         new_my_addr = (struct sockaddr *)&new_conf->my_addr;
2033         new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
2034
2035         /* No need for _rcu here. All reconfiguration is
2036          * strictly serialized on genl_lock(). We are protected against
2037          * concurrent reconfiguration/addition/deletion */
2038         list_for_each_entry(oconn, &drbd_tconns, all_tconn) {
2039                 struct net_conf *nc;
2040                 if (oconn == tconn)
2041                         continue;
2042
2043                 rcu_read_lock();
2044                 nc = rcu_dereference(oconn->net_conf);
2045                 if (nc) {
2046                         taken_addr = (struct sockaddr *)&nc->my_addr;
2047                         if (new_conf->my_addr_len == nc->my_addr_len &&
2048                             !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
2049                                 retcode = ERR_LOCAL_ADDR;
2050
2051                         taken_addr = (struct sockaddr *)&nc->peer_addr;
2052                         if (new_conf->peer_addr_len == nc->peer_addr_len &&
2053                             !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
2054                                 retcode = ERR_PEER_ADDR;
2055                 }
2056                 rcu_read_unlock();
2057                 if (retcode != NO_ERROR)
2058                         goto fail;
2059         }
2060
2061         retcode = alloc_crypto(&crypto, new_conf);
2062         if (retcode != NO_ERROR)
2063                 goto fail;
2064
2065         ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2066
2067         conn_flush_workqueue(tconn);
2068
2069         mutex_lock(&tconn->conf_update);
2070         old_conf = tconn->net_conf;
2071         if (old_conf) {
2072                 retcode = ERR_NET_CONFIGURED;
2073                 mutex_unlock(&tconn->conf_update);
2074                 goto fail;
2075         }
2076         rcu_assign_pointer(tconn->net_conf, new_conf);
2077
2078         conn_free_crypto(tconn);
2079         tconn->int_dig_in = crypto.int_dig_in;
2080         tconn->int_dig_vv = crypto.int_dig_vv;
2081         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2082         tconn->integrity_tfm = crypto.integrity_tfm;
2083         tconn->csums_tfm = crypto.csums_tfm;
2084         tconn->verify_tfm = crypto.verify_tfm;
2085
2086         mutex_unlock(&tconn->conf_update);
2087
2088         rcu_read_lock();
2089         idr_for_each_entry(&tconn->volumes, mdev, i) {
2090                 mdev->send_cnt = 0;
2091                 mdev->recv_cnt = 0;
2092         }
2093         rcu_read_unlock();
2094
2095         retcode = conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2096
2097         conn_reconfig_done(tconn);
2098         drbd_adm_finish(info, retcode);
2099         return 0;
2100
2101 fail:
2102         free_crypto(&crypto);
2103         kfree(new_conf);
2104
2105         conn_reconfig_done(tconn);
2106 out:
2107         drbd_adm_finish(info, retcode);
2108         return 0;
2109 }
2110
2111 static enum drbd_state_rv conn_try_disconnect(struct drbd_tconn *tconn, bool force)
2112 {
2113         enum drbd_state_rv rv;
2114
2115         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2116                         force ? CS_HARD : 0);
2117
2118         switch (rv) {
2119         case SS_NOTHING_TO_DO:
2120                 break;
2121         case SS_ALREADY_STANDALONE:
2122                 return SS_SUCCESS;
2123         case SS_PRIMARY_NOP:
2124                 /* Our state checking code wants to see the peer outdated. */
2125                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2126                                                 pdsk, D_OUTDATED), CS_VERBOSE);
2127                 break;
2128         case SS_CW_FAILED_BY_PEER:
2129                 /* The peer probably wants to see us outdated. */
2130                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2131                                                         disk, D_OUTDATED), 0);
2132                 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2133                         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2134                                         CS_HARD);
2135                 }
2136                 break;
2137         default:;
2138                 /* no special handling necessary */
2139         }
2140
2141         if (rv >= SS_SUCCESS) {
2142                 enum drbd_state_rv rv2;
2143                 /* No one else can reconfigure the network while I am here.
2144                  * The state handling only uses drbd_thread_stop_nowait(),
2145                  * we want to really wait here until the receiver is no more.
2146                  */
2147                 drbd_thread_stop(&adm_ctx.tconn->receiver);
2148
2149                 /* Race breaker.  This additional state change request may be
2150                  * necessary, if this was a forced disconnect during a receiver
2151                  * restart.  We may have "killed" the receiver thread just
2152                  * after drbdd_init() returned.  Typically, we should be
2153                  * C_STANDALONE already, now, and this becomes a no-op.
2154                  */
2155                 rv2 = conn_request_state(tconn, NS(conn, C_STANDALONE),
2156                                 CS_VERBOSE | CS_HARD);
2157                 if (rv2 < SS_SUCCESS)
2158                         conn_err(tconn,
2159                                 "unexpected rv2=%d in conn_try_disconnect()\n",
2160                                 rv2);
2161         }
2162         return rv;
2163 }
2164
2165 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2166 {
2167         struct disconnect_parms parms;
2168         struct drbd_tconn *tconn;
2169         enum drbd_state_rv rv;
2170         enum drbd_ret_code retcode;
2171         int err;
2172
2173         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
2174         if (!adm_ctx.reply_skb)
2175                 return retcode;
2176         if (retcode != NO_ERROR)
2177                 goto fail;
2178
2179         tconn = adm_ctx.tconn;
2180         memset(&parms, 0, sizeof(parms));
2181         if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2182                 err = disconnect_parms_from_attrs(&parms, info);
2183                 if (err) {
2184                         retcode = ERR_MANDATORY_TAG;
2185                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2186                         goto fail;
2187                 }
2188         }
2189
2190         rv = conn_try_disconnect(tconn, parms.force_disconnect);
2191         if (rv < SS_SUCCESS)
2192                 retcode = rv;  /* FIXME: Type mismatch. */
2193         else
2194                 retcode = NO_ERROR;
2195  fail:
2196         drbd_adm_finish(info, retcode);
2197         return 0;
2198 }
2199
2200 void resync_after_online_grow(struct drbd_conf *mdev)
2201 {
2202         int iass; /* I am sync source */
2203
2204         dev_info(DEV, "Resync of new storage after online grow\n");
2205         if (mdev->state.role != mdev->state.peer)
2206                 iass = (mdev->state.role == R_PRIMARY);
2207         else
2208                 iass = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags);
2209
2210         if (iass)
2211                 drbd_start_resync(mdev, C_SYNC_SOURCE);
2212         else
2213                 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2214 }
2215
2216 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2217 {
2218         struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
2219         struct resize_parms rs;
2220         struct drbd_conf *mdev;
2221         enum drbd_ret_code retcode;
2222         enum determine_dev_size dd;
2223         enum dds_flags ddsf;
2224         sector_t u_size;
2225         int err;
2226
2227         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2228         if (!adm_ctx.reply_skb)
2229                 return retcode;
2230         if (retcode != NO_ERROR)
2231                 goto fail;
2232
2233         memset(&rs, 0, sizeof(struct resize_parms));
2234         if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2235                 err = resize_parms_from_attrs(&rs, info);
2236                 if (err) {
2237                         retcode = ERR_MANDATORY_TAG;
2238                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2239                         goto fail;
2240                 }
2241         }
2242
2243         mdev = adm_ctx.mdev;
2244         if (mdev->state.conn > C_CONNECTED) {
2245                 retcode = ERR_RESIZE_RESYNC;
2246                 goto fail;
2247         }
2248
2249         if (mdev->state.role == R_SECONDARY &&
2250             mdev->state.peer == R_SECONDARY) {
2251                 retcode = ERR_NO_PRIMARY;
2252                 goto fail;
2253         }
2254
2255         if (!get_ldev(mdev)) {
2256                 retcode = ERR_NO_DISK;
2257                 goto fail;
2258         }
2259
2260         if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
2261                 retcode = ERR_NEED_APV_93;
2262                 goto fail;
2263         }
2264
2265         rcu_read_lock();
2266         u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
2267         rcu_read_unlock();
2268         if (u_size != (sector_t)rs.resize_size) {
2269                 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2270                 if (!new_disk_conf) {
2271                         retcode = ERR_NOMEM;
2272                         goto fail;
2273                 }
2274         }
2275
2276         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
2277                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
2278
2279         if (new_disk_conf) {
2280                 mutex_lock(&mdev->tconn->conf_update);
2281                 old_disk_conf = mdev->ldev->disk_conf;
2282                 *new_disk_conf = *old_disk_conf;
2283                 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2284                 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
2285                 mutex_unlock(&mdev->tconn->conf_update);
2286                 synchronize_rcu();
2287                 kfree(old_disk_conf);
2288         }
2289
2290         ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2291         dd = drbd_determine_dev_size(mdev, ddsf);
2292         drbd_md_sync(mdev);
2293         put_ldev(mdev);
2294         if (dd == dev_size_error) {
2295                 retcode = ERR_NOMEM_BITMAP;
2296                 goto fail;
2297         }
2298
2299         if (mdev->state.conn == C_CONNECTED) {
2300                 if (dd == grew)
2301                         set_bit(RESIZE_PENDING, &mdev->flags);
2302
2303                 drbd_send_uuids(mdev);
2304                 drbd_send_sizes(mdev, 1, ddsf);
2305         }
2306
2307  fail:
2308         drbd_adm_finish(info, retcode);
2309         return 0;
2310 }
2311
2312 void drbd_set_res_opts_defaults(struct res_opts *r)
2313 {
2314         return set_res_opts_defaults(r);
2315 }
2316
2317 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2318 {
2319         enum drbd_ret_code retcode;
2320         cpumask_var_t new_cpu_mask;
2321         struct drbd_tconn *tconn;
2322         struct res_opts res_opts;
2323         int err;
2324
2325         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
2326         if (!adm_ctx.reply_skb)
2327                 return retcode;
2328         if (retcode != NO_ERROR)
2329                 goto fail;
2330         tconn = adm_ctx.tconn;
2331
2332         if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
2333                 retcode = ERR_NOMEM;
2334                 drbd_msg_put_info("unable to allocate cpumask");
2335                 goto fail;
2336         }
2337
2338         res_opts = tconn->res_opts;
2339         if (should_set_defaults(info))
2340                 set_res_opts_defaults(&res_opts);
2341
2342         err = res_opts_from_attrs(&res_opts, info);
2343         if (err && err != -ENOMSG) {
2344                 retcode = ERR_MANDATORY_TAG;
2345                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2346                 goto fail;
2347         }
2348
2349         /* silently ignore cpu mask on UP kernel */
2350         if (nr_cpu_ids > 1 && res_opts.cpu_mask[0] != 0) {
2351                 err = __bitmap_parse(res_opts.cpu_mask, 32, 0,
2352                                 cpumask_bits(new_cpu_mask), nr_cpu_ids);
2353                 if (err) {
2354                         conn_warn(tconn, "__bitmap_parse() failed with %d\n", err);
2355                         retcode = ERR_CPU_MASK_PARSE;
2356                         goto fail;
2357                 }
2358         }
2359
2360
2361         tconn->res_opts = res_opts;
2362
2363         if (!cpumask_equal(tconn->cpu_mask, new_cpu_mask)) {
2364                 cpumask_copy(tconn->cpu_mask, new_cpu_mask);
2365                 drbd_calc_cpu_mask(tconn);
2366                 tconn->receiver.reset_cpu_mask = 1;
2367                 tconn->asender.reset_cpu_mask = 1;
2368                 tconn->worker.reset_cpu_mask = 1;
2369         }
2370
2371 fail:
2372         free_cpumask_var(new_cpu_mask);
2373
2374         drbd_adm_finish(info, retcode);
2375         return 0;
2376 }
2377
2378 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2379 {
2380         struct drbd_conf *mdev;
2381         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2382
2383         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2384         if (!adm_ctx.reply_skb)
2385                 return retcode;
2386         if (retcode != NO_ERROR)
2387                 goto out;
2388
2389         mdev = adm_ctx.mdev;
2390
2391         /* If there is still bitmap IO pending, probably because of a previous
2392          * resync just being finished, wait for it before requesting a new resync. */
2393         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2394
2395         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
2396
2397         if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
2398                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2399
2400         while (retcode == SS_NEED_CONNECTION) {
2401                 spin_lock_irq(&mdev->tconn->req_lock);
2402                 if (mdev->state.conn < C_CONNECTED)
2403                         retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
2404                 spin_unlock_irq(&mdev->tconn->req_lock);
2405
2406                 if (retcode != SS_NEED_CONNECTION)
2407                         break;
2408
2409                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2410         }
2411
2412 out:
2413         drbd_adm_finish(info, retcode);
2414         return 0;
2415 }
2416
2417 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
2418 {
2419         int rv;
2420
2421         rv = drbd_bmio_set_n_write(mdev);
2422         drbd_suspend_al(mdev);
2423         return rv;
2424 }
2425
2426 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2427                 union drbd_state mask, union drbd_state val)
2428 {
2429         enum drbd_ret_code retcode;
2430
2431         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2432         if (!adm_ctx.reply_skb)
2433                 return retcode;
2434         if (retcode != NO_ERROR)
2435                 goto out;
2436
2437         retcode = drbd_request_state(adm_ctx.mdev, mask, val);
2438 out:
2439         drbd_adm_finish(info, retcode);
2440         return 0;
2441 }
2442
2443 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
2444 {
2445         return drbd_adm_simple_request_state(skb, info, NS(conn, C_STARTING_SYNC_S));
2446 }
2447
2448 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2449 {
2450         enum drbd_ret_code retcode;
2451
2452         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2453         if (!adm_ctx.reply_skb)
2454                 return retcode;
2455         if (retcode != NO_ERROR)
2456                 goto out;
2457
2458         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2459                 retcode = ERR_PAUSE_IS_SET;
2460 out:
2461         drbd_adm_finish(info, retcode);
2462         return 0;
2463 }
2464
2465 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
2466 {
2467         union drbd_dev_state s;
2468         enum drbd_ret_code retcode;
2469
2470         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2471         if (!adm_ctx.reply_skb)
2472                 return retcode;
2473         if (retcode != NO_ERROR)
2474                 goto out;
2475
2476         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2477                 s = adm_ctx.mdev->state;
2478                 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2479                         retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2480                                   s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2481                 } else {
2482                         retcode = ERR_PAUSE_IS_CLEAR;
2483                 }
2484         }
2485
2486 out:
2487         drbd_adm_finish(info, retcode);
2488         return 0;
2489 }
2490
2491 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
2492 {
2493         return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
2494 }
2495
2496 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
2497 {
2498         struct drbd_conf *mdev;
2499         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2500
2501         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2502         if (!adm_ctx.reply_skb)
2503                 return retcode;
2504         if (retcode != NO_ERROR)
2505                 goto out;
2506
2507         mdev = adm_ctx.mdev;
2508         if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2509                 drbd_uuid_new_current(mdev);
2510                 clear_bit(NEW_CUR_UUID, &mdev->flags);
2511         }
2512         drbd_suspend_io(mdev);
2513         retcode = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2514         if (retcode == SS_SUCCESS) {
2515                 if (mdev->state.conn < C_CONNECTED)
2516                         tl_clear(mdev->tconn);
2517                 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2518                         tl_restart(mdev->tconn, FAIL_FROZEN_DISK_IO);
2519         }
2520         drbd_resume_io(mdev);
2521
2522 out:
2523         drbd_adm_finish(info, retcode);
2524         return 0;
2525 }
2526
2527 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
2528 {
2529         return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
2530 }
2531
2532 int nla_put_drbd_cfg_context(struct sk_buff *skb, const char *resource_name, unsigned vnr)
2533 {
2534         struct nlattr *nla;
2535         nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2536         if (!nla)
2537                 goto nla_put_failure;
2538         if (vnr != VOLUME_UNSPECIFIED)
2539                 NLA_PUT_U32(skb, T_ctx_volume, vnr);
2540         NLA_PUT_STRING(skb, T_ctx_resource_name, resource_name);
2541         nla_nest_end(skb, nla);
2542         return 0;
2543
2544 nla_put_failure:
2545         if (nla)
2546                 nla_nest_cancel(skb, nla);
2547         return -EMSGSIZE;
2548 }
2549
2550 int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
2551                 const struct sib_info *sib)
2552 {
2553         struct state_info *si = NULL; /* for sizeof(si->member); */
2554         struct net_conf *nc;
2555         struct nlattr *nla;
2556         int got_ldev;
2557         int err = 0;
2558         int exclude_sensitive;
2559
2560         /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2561          * to.  So we better exclude_sensitive information.
2562          *
2563          * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2564          * in the context of the requesting user process. Exclude sensitive
2565          * information, unless current has superuser.
2566          *
2567          * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2568          * relies on the current implementation of netlink_dump(), which
2569          * executes the dump callback successively from netlink_recvmsg(),
2570          * always in the context of the receiving process */
2571         exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2572
2573         got_ldev = get_ldev(mdev);
2574
2575         /* We need to add connection name and volume number information still.
2576          * Minor number is in drbd_genlmsghdr. */
2577         if (nla_put_drbd_cfg_context(skb, mdev->tconn->name, mdev->vnr))
2578                 goto nla_put_failure;
2579
2580         if (res_opts_to_skb(skb, &mdev->tconn->res_opts, exclude_sensitive))
2581                 goto nla_put_failure;
2582
2583         rcu_read_lock();
2584         if (got_ldev)
2585                 if (disk_conf_to_skb(skb, rcu_dereference(mdev->ldev->disk_conf), exclude_sensitive))
2586                         goto nla_put_failure;
2587
2588         nc = rcu_dereference(mdev->tconn->net_conf);
2589         if (nc)
2590                 err = net_conf_to_skb(skb, nc, exclude_sensitive);
2591         rcu_read_unlock();
2592         if (err)
2593                 goto nla_put_failure;
2594
2595         nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2596         if (!nla)
2597                 goto nla_put_failure;
2598         NLA_PUT_U32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY);
2599         NLA_PUT_U32(skb, T_current_state, mdev->state.i);
2600         NLA_PUT_U64(skb, T_ed_uuid, mdev->ed_uuid);
2601         NLA_PUT_U64(skb, T_capacity, drbd_get_capacity(mdev->this_bdev));
2602
2603         if (got_ldev) {
2604                 NLA_PUT_U32(skb, T_disk_flags, mdev->ldev->md.flags);
2605                 NLA_PUT(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid);
2606                 NLA_PUT_U64(skb, T_bits_total, drbd_bm_bits(mdev));
2607                 NLA_PUT_U64(skb, T_bits_oos, drbd_bm_total_weight(mdev));
2608                 if (C_SYNC_SOURCE <= mdev->state.conn &&
2609                     C_PAUSED_SYNC_T >= mdev->state.conn) {
2610                         NLA_PUT_U64(skb, T_bits_rs_total, mdev->rs_total);
2611                         NLA_PUT_U64(skb, T_bits_rs_failed, mdev->rs_failed);
2612                 }
2613         }
2614
2615         if (sib) {
2616                 switch(sib->sib_reason) {
2617                 case SIB_SYNC_PROGRESS:
2618                 case SIB_GET_STATUS_REPLY:
2619                         break;
2620                 case SIB_STATE_CHANGE:
2621                         NLA_PUT_U32(skb, T_prev_state, sib->os.i);
2622                         NLA_PUT_U32(skb, T_new_state, sib->ns.i);
2623                         break;
2624                 case SIB_HELPER_POST:
2625                         NLA_PUT_U32(skb,
2626                                 T_helper_exit_code, sib->helper_exit_code);
2627                         /* fall through */
2628                 case SIB_HELPER_PRE:
2629                         NLA_PUT_STRING(skb, T_helper, sib->helper_name);
2630                         break;
2631                 }
2632         }
2633         nla_nest_end(skb, nla);
2634
2635         if (0)
2636 nla_put_failure:
2637                 err = -EMSGSIZE;
2638         if (got_ldev)
2639                 put_ldev(mdev);
2640         return err;
2641 }
2642
2643 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
2644 {
2645         enum drbd_ret_code retcode;
2646         int err;
2647
2648         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2649         if (!adm_ctx.reply_skb)
2650                 return retcode;
2651         if (retcode != NO_ERROR)
2652                 goto out;
2653
2654         err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.mdev, NULL);
2655         if (err) {
2656                 nlmsg_free(adm_ctx.reply_skb);
2657                 return err;
2658         }
2659 out:
2660         drbd_adm_finish(info, retcode);
2661         return 0;
2662 }
2663
2664 int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
2665 {
2666         struct drbd_conf *mdev;
2667         struct drbd_genlmsghdr *dh;
2668         struct drbd_tconn *pos = (struct drbd_tconn*)cb->args[0];
2669         struct drbd_tconn *tconn = NULL;
2670         struct drbd_tconn *tmp;
2671         unsigned volume = cb->args[1];
2672
2673         /* Open coded, deferred, iteration:
2674          * list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
2675          *      idr_for_each_entry(&tconn->volumes, mdev, i) {
2676          *        ...
2677          *      }
2678          * }
2679          * where tconn is cb->args[0];
2680          * and i is cb->args[1];
2681          *
2682          * cb->args[2] indicates if we shall loop over all resources,
2683          * or just dump all volumes of a single resource.
2684          *
2685          * This may miss entries inserted after this dump started,
2686          * or entries deleted before they are reached.
2687          *
2688          * We need to make sure the mdev won't disappear while
2689          * we are looking at it, and revalidate our iterators
2690          * on each iteration.
2691          */
2692
2693         /* synchronize with conn_create()/conn_destroy() */
2694         rcu_read_lock();
2695         /* revalidate iterator position */
2696         list_for_each_entry_rcu(tmp, &drbd_tconns, all_tconn) {
2697                 if (pos == NULL) {
2698                         /* first iteration */
2699                         pos = tmp;
2700                         tconn = pos;
2701                         break;
2702                 }
2703                 if (tmp == pos) {
2704                         tconn = pos;
2705                         break;
2706                 }
2707         }
2708         if (tconn) {
2709 next_tconn:
2710                 mdev = idr_get_next(&tconn->volumes, &volume);
2711                 if (!mdev) {
2712                         /* No more volumes to dump on this tconn.
2713                          * Advance tconn iterator. */
2714                         pos = list_entry_rcu(tconn->all_tconn.next,
2715                                              struct drbd_tconn, all_tconn);
2716                         /* Did we dump any volume on this tconn yet? */
2717                         if (volume != 0) {
2718                                 /* If we reached the end of the list,
2719                                  * or only a single resource dump was requested,
2720                                  * we are done. */
2721                                 if (&pos->all_tconn == &drbd_tconns || cb->args[2])
2722                                         goto out;
2723                                 volume = 0;
2724                                 tconn = pos;
2725                                 goto next_tconn;
2726                         }
2727                 }
2728
2729                 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).pid,
2730                                 cb->nlh->nlmsg_seq, &drbd_genl_family,
2731                                 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
2732                 if (!dh)
2733                         goto out;
2734
2735                 if (!mdev) {
2736                         /* this is a tconn without a single volume */
2737                         dh->minor = -1U;
2738                         dh->ret_code = NO_ERROR;
2739                         if (nla_put_drbd_cfg_context(skb, tconn->name, VOLUME_UNSPECIFIED))
2740                                 genlmsg_cancel(skb, dh);
2741                         else
2742                                 genlmsg_end(skb, dh);
2743                         goto out;
2744                 }
2745
2746                 D_ASSERT(mdev->vnr == volume);
2747                 D_ASSERT(mdev->tconn == tconn);
2748
2749                 dh->minor = mdev_to_minor(mdev);
2750                 dh->ret_code = NO_ERROR;
2751
2752                 if (nla_put_status_info(skb, mdev, NULL)) {
2753                         genlmsg_cancel(skb, dh);
2754                         goto out;
2755                 }
2756                 genlmsg_end(skb, dh);
2757         }
2758
2759 out:
2760         rcu_read_unlock();
2761         /* where to start the next iteration */
2762         cb->args[0] = (long)pos;
2763         cb->args[1] = (pos == tconn) ? volume + 1 : 0;
2764
2765         /* No more tconns/volumes/minors found results in an empty skb.
2766          * Which will terminate the dump. */
2767         return skb->len;
2768 }
2769
2770 /*
2771  * Request status of all resources, or of all volumes within a single resource.
2772  *
2773  * This is a dump, as the answer may not fit in a single reply skb otherwise.
2774  * Which means we cannot use the family->attrbuf or other such members, because
2775  * dump is NOT protected by the genl_lock().  During dump, we only have access
2776  * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
2777  *
2778  * Once things are setup properly, we call into get_one_status().
2779  */
2780 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
2781 {
2782         const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
2783         struct nlattr *nla;
2784         const char *resource_name;
2785         struct drbd_tconn *tconn;
2786         int maxtype;
2787
2788         /* Is this a followup call? */
2789         if (cb->args[0]) {
2790                 /* ... of a single resource dump,
2791                  * and the resource iterator has been advanced already? */
2792                 if (cb->args[2] && cb->args[2] != cb->args[0])
2793                         return 0; /* DONE. */
2794                 goto dump;
2795         }
2796
2797         /* First call (from netlink_dump_start).  We need to figure out
2798          * which resource(s) the user wants us to dump. */
2799         nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
2800                         nlmsg_attrlen(cb->nlh, hdrlen),
2801                         DRBD_NLA_CFG_CONTEXT);
2802
2803         /* No explicit context given.  Dump all. */
2804         if (!nla)
2805                 goto dump;
2806         maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
2807         nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
2808         if (IS_ERR(nla))
2809                 return PTR_ERR(nla);
2810         /* context given, but no name present? */
2811         if (!nla)
2812                 return -EINVAL;
2813         resource_name = nla_data(nla);
2814         tconn = conn_get_by_name(resource_name);
2815
2816         if (!tconn)
2817                 return -ENODEV;
2818
2819         kref_put(&tconn->kref, &conn_destroy); /* get_one_status() (re)validates tconn by itself */
2820
2821         /* prime iterators, and set "filter" mode mark:
2822          * only dump this tconn. */
2823         cb->args[0] = (long)tconn;
2824         /* cb->args[1] = 0; passed in this way. */
2825         cb->args[2] = (long)tconn;
2826
2827 dump:
2828         return get_one_status(skb, cb);
2829 }
2830
2831 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
2832 {
2833         enum drbd_ret_code retcode;
2834         struct timeout_parms tp;
2835         int err;
2836
2837         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2838         if (!adm_ctx.reply_skb)
2839                 return retcode;
2840         if (retcode != NO_ERROR)
2841                 goto out;
2842
2843         tp.timeout_type =
2844                 adm_ctx.mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2845                 test_bit(USE_DEGR_WFC_T, &adm_ctx.mdev->flags) ? UT_DEGRADED :
2846                 UT_DEFAULT;
2847
2848         err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
2849         if (err) {
2850                 nlmsg_free(adm_ctx.reply_skb);
2851                 return err;
2852         }
2853 out:
2854         drbd_adm_finish(info, retcode);
2855         return 0;
2856 }
2857
2858 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
2859 {
2860         struct drbd_conf *mdev;
2861         enum drbd_ret_code retcode;
2862
2863         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2864         if (!adm_ctx.reply_skb)
2865                 return retcode;
2866         if (retcode != NO_ERROR)
2867                 goto out;
2868
2869         mdev = adm_ctx.mdev;
2870         if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
2871                 /* resume from last known position, if possible */
2872                 struct start_ov_parms parms =
2873                         { .ov_start_sector = mdev->ov_start_sector };
2874                 int err = start_ov_parms_from_attrs(&parms, info);
2875                 if (err) {
2876                         retcode = ERR_MANDATORY_TAG;
2877                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2878                         goto out;
2879                 }
2880                 /* w_make_ov_request expects position to be aligned */
2881                 mdev->ov_start_sector = parms.ov_start_sector & ~BM_SECT_PER_BIT;
2882         }
2883         /* If there is still bitmap IO pending, e.g. previous resync or verify
2884          * just being finished, wait for it before requesting a new resync. */
2885         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2886         retcode = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2887 out:
2888         drbd_adm_finish(info, retcode);
2889         return 0;
2890 }
2891
2892
2893 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
2894 {
2895         struct drbd_conf *mdev;
2896         enum drbd_ret_code retcode;
2897         int skip_initial_sync = 0;
2898         int err;
2899         struct new_c_uuid_parms args;
2900
2901         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2902         if (!adm_ctx.reply_skb)
2903                 return retcode;
2904         if (retcode != NO_ERROR)
2905                 goto out_nolock;
2906
2907         mdev = adm_ctx.mdev;
2908         memset(&args, 0, sizeof(args));
2909         if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
2910                 err = new_c_uuid_parms_from_attrs(&args, info);
2911                 if (err) {
2912                         retcode = ERR_MANDATORY_TAG;
2913                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2914                         goto out_nolock;
2915                 }
2916         }
2917
2918         mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
2919
2920         if (!get_ldev(mdev)) {
2921                 retcode = ERR_NO_DISK;
2922                 goto out;
2923         }
2924
2925         /* this is "skip initial sync", assume to be clean */
2926         if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
2927             mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2928                 dev_info(DEV, "Preparing to skip initial sync\n");
2929                 skip_initial_sync = 1;
2930         } else if (mdev->state.conn != C_STANDALONE) {
2931                 retcode = ERR_CONNECTED;
2932                 goto out_dec;
2933         }
2934
2935         drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2936         drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2937
2938         if (args.clear_bm) {
2939                 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
2940                         "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
2941                 if (err) {
2942                         dev_err(DEV, "Writing bitmap failed with %d\n",err);
2943                         retcode = ERR_IO_MD_DISK;
2944                 }
2945                 if (skip_initial_sync) {
2946                         drbd_send_uuids_skip_initial_sync(mdev);
2947                         _drbd_uuid_set(mdev, UI_BITMAP, 0);
2948                         drbd_print_uuids(mdev, "cleared bitmap UUID");
2949                         spin_lock_irq(&mdev->tconn->req_lock);
2950                         _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2951                                         CS_VERBOSE, NULL);
2952                         spin_unlock_irq(&mdev->tconn->req_lock);
2953                 }
2954         }
2955
2956         drbd_md_sync(mdev);
2957 out_dec:
2958         put_ldev(mdev);
2959 out:
2960         mutex_unlock(mdev->state_mutex);
2961 out_nolock:
2962         drbd_adm_finish(info, retcode);
2963         return 0;
2964 }
2965
2966 static enum drbd_ret_code
2967 drbd_check_resource_name(const char *name)
2968 {
2969         if (!name || !name[0]) {
2970                 drbd_msg_put_info("resource name missing");
2971                 return ERR_MANDATORY_TAG;
2972         }
2973         /* if we want to use these in sysfs/configfs/debugfs some day,
2974          * we must not allow slashes */
2975         if (strchr(name, '/')) {
2976                 drbd_msg_put_info("invalid resource name");
2977                 return ERR_INVALID_REQUEST;
2978         }
2979         return NO_ERROR;
2980 }
2981
2982 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
2983 {
2984         enum drbd_ret_code retcode;
2985
2986         retcode = drbd_adm_prepare(skb, info, 0);
2987         if (!adm_ctx.reply_skb)
2988                 return retcode;
2989         if (retcode != NO_ERROR)
2990                 goto out;
2991
2992         retcode = drbd_check_resource_name(adm_ctx.resource_name);
2993         if (retcode != NO_ERROR)
2994                 goto out;
2995
2996         if (adm_ctx.tconn) {
2997                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
2998                         retcode = ERR_INVALID_REQUEST;
2999                         drbd_msg_put_info("resource exists");
3000                 }
3001                 /* else: still NO_ERROR */
3002                 goto out;
3003         }
3004
3005         if (!conn_create(adm_ctx.resource_name))
3006                 retcode = ERR_NOMEM;
3007 out:
3008         drbd_adm_finish(info, retcode);
3009         return 0;
3010 }
3011
3012 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info)
3013 {
3014         struct drbd_genlmsghdr *dh = info->userhdr;
3015         enum drbd_ret_code retcode;
3016
3017         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
3018         if (!adm_ctx.reply_skb)
3019                 return retcode;
3020         if (retcode != NO_ERROR)
3021                 goto out;
3022
3023         /* FIXME drop minor_count parameter, limit to MINORMASK */
3024         if (dh->minor >= minor_count) {
3025                 drbd_msg_put_info("requested minor out of range");
3026                 retcode = ERR_INVALID_REQUEST;
3027                 goto out;
3028         }
3029         if (adm_ctx.volume > DRBD_VOLUME_MAX) {
3030                 drbd_msg_put_info("requested volume id out of range");
3031                 retcode = ERR_INVALID_REQUEST;
3032                 goto out;
3033         }
3034
3035         /* drbd_adm_prepare made sure already
3036          * that mdev->tconn and mdev->vnr match the request. */
3037         if (adm_ctx.mdev) {
3038                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3039                         retcode = ERR_MINOR_EXISTS;
3040                 /* else: still NO_ERROR */
3041                 goto out;
3042         }
3043
3044         retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume);
3045 out:
3046         drbd_adm_finish(info, retcode);
3047         return 0;
3048 }
3049
3050 static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
3051 {
3052         if (mdev->state.disk == D_DISKLESS &&
3053             /* no need to be mdev->state.conn == C_STANDALONE &&
3054              * we may want to delete a minor from a live replication group.
3055              */
3056             mdev->state.role == R_SECONDARY) {
3057                 idr_remove(&mdev->tconn->volumes, mdev->vnr);
3058                 idr_remove(&minors, mdev_to_minor(mdev));
3059                 del_gendisk(mdev->vdisk);
3060                 synchronize_rcu();
3061                 kref_put(&mdev->kref, &drbd_minor_destroy);
3062                 return NO_ERROR;
3063         } else
3064                 return ERR_MINOR_CONFIGURED;
3065 }
3066
3067 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info)
3068 {
3069         enum drbd_ret_code retcode;
3070
3071         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3072         if (!adm_ctx.reply_skb)
3073                 return retcode;
3074         if (retcode != NO_ERROR)
3075                 goto out;
3076
3077         retcode = adm_delete_minor(adm_ctx.mdev);
3078 out:
3079         drbd_adm_finish(info, retcode);
3080         return 0;
3081 }
3082
3083 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3084 {
3085         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
3086         struct drbd_conf *mdev;
3087         unsigned i;
3088
3089         retcode = drbd_adm_prepare(skb, info, 0);
3090         if (!adm_ctx.reply_skb)
3091                 return retcode;
3092         if (retcode != NO_ERROR)
3093                 goto out;
3094
3095         if (!adm_ctx.tconn) {
3096                 retcode = ERR_RES_NOT_KNOWN;
3097                 goto out;
3098         }
3099
3100         /* demote */
3101         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3102                 retcode = drbd_set_role(mdev, R_SECONDARY, 0);
3103                 if (retcode < SS_SUCCESS) {
3104                         drbd_msg_put_info("failed to demote");
3105                         goto out;
3106                 }
3107         }
3108
3109         retcode = conn_try_disconnect(adm_ctx.tconn, 0);
3110         if (retcode < SS_SUCCESS) {
3111                 drbd_msg_put_info("failed to disconnect");
3112                 goto out;
3113         }
3114
3115         /* detach */
3116         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3117                 retcode = adm_detach(mdev);
3118                 if (retcode < SS_SUCCESS) {
3119                         drbd_msg_put_info("failed to detach");
3120                         goto out;
3121                 }
3122         }
3123
3124         /* If we reach this, all volumes (of this tconn) are Secondary,
3125          * Disconnected, Diskless, aka Unconfigured. Make sure all threads have
3126          * actually stopped, state handling only does drbd_thread_stop_nowait(). */
3127         drbd_thread_stop(&adm_ctx.tconn->worker);
3128
3129         /* Now, nothing can fail anymore */
3130
3131         /* delete volumes */
3132         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3133                 retcode = adm_delete_minor(mdev);
3134                 if (retcode != NO_ERROR) {
3135                         /* "can not happen" */
3136                         drbd_msg_put_info("failed to delete volume");
3137                         goto out;
3138                 }
3139         }
3140
3141         /* delete connection */
3142         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3143                 list_del_rcu(&adm_ctx.tconn->all_tconn);
3144                 synchronize_rcu();
3145                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3146
3147                 retcode = NO_ERROR;
3148         } else {
3149                 /* "can not happen" */
3150                 retcode = ERR_RES_IN_USE;
3151                 drbd_msg_put_info("failed to delete connection");
3152         }
3153         goto out;
3154 out:
3155         drbd_adm_finish(info, retcode);
3156         return 0;
3157 }
3158
3159 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
3160 {
3161         enum drbd_ret_code retcode;
3162
3163         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
3164         if (!adm_ctx.reply_skb)
3165                 return retcode;
3166         if (retcode != NO_ERROR)
3167                 goto out;
3168
3169         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3170                 list_del_rcu(&adm_ctx.tconn->all_tconn);
3171                 synchronize_rcu();
3172                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3173
3174                 retcode = NO_ERROR;
3175         } else {
3176                 retcode = ERR_RES_IN_USE;
3177         }
3178
3179         if (retcode == NO_ERROR)
3180                 drbd_thread_stop(&adm_ctx.tconn->worker);
3181 out:
3182         drbd_adm_finish(info, retcode);
3183         return 0;
3184 }
3185
3186 void drbd_bcast_event(struct drbd_conf *mdev, const struct sib_info *sib)
3187 {
3188         static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3189         struct sk_buff *msg;
3190         struct drbd_genlmsghdr *d_out;
3191         unsigned seq;
3192         int err = -ENOMEM;
3193
3194         seq = atomic_inc_return(&drbd_genl_seq);
3195         msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3196         if (!msg)
3197                 goto failed;
3198
3199         err = -EMSGSIZE;
3200         d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3201         if (!d_out) /* cannot happen, but anyways. */
3202                 goto nla_put_failure;
3203         d_out->minor = mdev_to_minor(mdev);
3204         d_out->ret_code = NO_ERROR;
3205
3206         if (nla_put_status_info(msg, mdev, sib))
3207                 goto nla_put_failure;
3208         genlmsg_end(msg, d_out);
3209         err = drbd_genl_multicast_events(msg, 0);
3210         /* msg has been consumed or freed in netlink_broadcast() */
3211         if (err && err != -ESRCH)
3212                 goto failed;
3213
3214         return;
3215
3216 nla_put_failure:
3217         nlmsg_free(msg);
3218 failed:
3219         dev_err(DEV, "Error %d while broadcasting event. "
3220                         "Event seq:%u sib_reason:%u\n",
3221                         err, seq, sib->sib_reason);
3222 }