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