drivers/block/drbd/drbd_nl.c

   1 /*
   2    drbd_nl.c
   3
   4    This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
   5
   6    Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
   7    Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
   8    Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
   9
  10    drbd is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2, or (at your option)
  13    any later version.
  14
  15    drbd is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with drbd; see the file COPYING.  If not, write to
  22    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/drbd.h>
  28 #include <linux/in.h>
  29 #include <linux/fs.h>
  30 #include <linux/file.h>
  31 #include <linux/slab.h>
  32 #include <linux/blkpg.h>
  33 #include <linux/cpumask.h>
  34 #include "drbd_int.h"
  35 #include "drbd_req.h"
  36 #include "drbd_wrappers.h"
  37 #include <asm/unaligned.h>
  38 #include <linux/drbd_limits.h>
  39 #include <linux/kthread.h>
  40
  41 #include <net/genetlink.h>
  42
  43 /* .doit */
  44 // int drbd_adm_create_resource(struct sk_buff *skb, struct genl_info *info);
  45 // int drbd_adm_delete_resource(struct sk_buff *skb, struct genl_info *info);
  46
  47 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info);
  48 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info);
  49
  50 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info);
  51 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info);
  52 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info);
  53
  54 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info);
  55 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info);
  56 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info);
  57 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info);
  58 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info);
  59 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info);
  60 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info);
  61 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info);
  62 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info);
  63 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info);
  64 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info);
  65 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info);
  66 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info);
  67 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info);
  68 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info);
  69 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info);
  70 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info);
  71 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info);
  72 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info);
  73 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info);
  74 /* .dumpit */
  75 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb);
  76
  77 #include <linux/drbd_genl_api.h>
  78 #include "drbd_nla.h"
  79 #include <linux/genl_magic_func.h>
  80
  81 /* used blkdev_get_by_path, to claim our meta data device(s) */
  82 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
  83
  84 /* Configuration is strictly serialized, because generic netlink message
  85  * processing is strictly serialized by the genl_lock().
  86  * Which means we can use one static global drbd_config_context struct.
  87  */
  88 static struct drbd_config_context {
  89         /* assigned from drbd_genlmsghdr */
  90         unsigned int minor;
  91         /* assigned from request attributes, if present */
  92         unsigned int volume;
  93 #define VOLUME_UNSPECIFIED              (-1U)
  94         /* pointer into the request skb,
  95          * limited lifetime! */
  96         char *resource_name;
  97         struct nlattr *my_addr;
  98         struct nlattr *peer_addr;
  99
 100         /* reply buffer */
 101         struct sk_buff *reply_skb;
 102         /* pointer into reply buffer */
 103         struct drbd_genlmsghdr *reply_dh;
 104         /* resolved from attributes, if possible */
 105         struct drbd_conf *mdev;
 106         struct drbd_tconn *tconn;
 107 } adm_ctx;
 108
 109 static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
 110 {
 111         genlmsg_end(skb, genlmsg_data(nlmsg_data(nlmsg_hdr(skb))));
 112         if (genlmsg_reply(skb, info))
 113                 printk(KERN_ERR "drbd: error sending genl reply\n");
 114 }
 115
 116 /* Used on a fresh "drbd_adm_prepare"d reply_skb, this cannot fail: The only
 117  * reason it could fail was no space in skb, and there are 4k available. */
 118 int drbd_msg_put_info(const char *info)
 119 {
 120         struct sk_buff *skb = adm_ctx.reply_skb;
 121         struct nlattr *nla;
 122         int err = -EMSGSIZE;
 123
 124         if (!info || !info[0])
 125                 return 0;
 126
 127         nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
 128         if (!nla)
 129                 return err;
 130
 131         err = nla_put_string(skb, T_info_text, info);
 132         if (err) {
 133                 nla_nest_cancel(skb, nla);
 134                 return err;
 135         } else
 136                 nla_nest_end(skb, nla);
 137         return 0;
 138 }
 139
 140 /* This would be a good candidate for a "pre_doit" hook,
 141  * and per-family private info->pointers.
 142  * But we need to stay compatible with older kernels.
 143  * If it returns successfully, adm_ctx members are valid.
 144  */
 145 #define DRBD_ADM_NEED_MINOR     1
 146 #define DRBD_ADM_NEED_RESOURCE  2
 147 #define DRBD_ADM_NEED_CONNECTION 4
 148 static int drbd_adm_prepare(struct sk_buff *skb, struct genl_info *info,
 149                 unsigned flags)
 150 {
 151         struct drbd_genlmsghdr *d_in = info->userhdr;
 152         const u8 cmd = info->genlhdr->cmd;
 153         int err;
 154
 155         memset(&adm_ctx, 0, sizeof(adm_ctx));
 156
 157         /* genl_rcv_msg only checks for CAP_NET_ADMIN on "GENL_ADMIN_PERM" :( */
 158         if (cmd != DRBD_ADM_GET_STATUS
 159         && security_netlink_recv(skb, CAP_SYS_ADMIN))
 160                return -EPERM;
 161
 162         adm_ctx.reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 163         if (!adm_ctx.reply_skb) {
 164                 err = -ENOMEM;
 165                 goto fail;
 166         }
 167
 168         adm_ctx.reply_dh = genlmsg_put_reply(adm_ctx.reply_skb,
 169                                         info, &drbd_genl_family, 0, cmd);
 170         /* put of a few bytes into a fresh skb of >= 4k will always succeed.
 171          * but anyways */
 172         if (!adm_ctx.reply_dh) {
 173                 err = -ENOMEM;
 174                 goto fail;
 175         }
 176
 177         adm_ctx.reply_dh->minor = d_in->minor;
 178         adm_ctx.reply_dh->ret_code = NO_ERROR;
 179
 180         adm_ctx.volume = VOLUME_UNSPECIFIED;
 181         if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
 182                 struct nlattr *nla;
 183                 /* parse and validate only */
 184                 err = drbd_cfg_context_from_attrs(NULL, info);
 185                 if (err)
 186                         goto fail;
 187
 188                 /* It was present, and valid,
 189                  * copy it over to the reply skb. */
 190                 err = nla_put_nohdr(adm_ctx.reply_skb,
 191                                 info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
 192                                 info->attrs[DRBD_NLA_CFG_CONTEXT]);
 193                 if (err)
 194                         goto fail;
 195
 196                 /* and assign stuff to the global adm_ctx */
 197                 nla = nested_attr_tb[__nla_type(T_ctx_volume)];
 198                 if (nla)
 199                         adm_ctx.volume = nla_get_u32(nla);
 200                 nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
 201                 if (nla)
 202                         adm_ctx.resource_name = nla_data(nla);
 203                 adm_ctx.my_addr = nested_attr_tb[__nla_type(T_ctx_my_addr)];
 204                 adm_ctx.peer_addr = nested_attr_tb[__nla_type(T_ctx_peer_addr)];
 205                 if ((adm_ctx.my_addr &&
 206                      nla_len(adm_ctx.my_addr) > sizeof(adm_ctx.tconn->my_addr)) ||
 207                     (adm_ctx.peer_addr &&
 208                      nla_len(adm_ctx.peer_addr) > sizeof(adm_ctx.tconn->peer_addr))) {
 209                         err = -EINVAL;
 210                         goto fail;
 211                 }
 212         }
 213
 214         adm_ctx.minor = d_in->minor;
 215         adm_ctx.mdev = minor_to_mdev(d_in->minor);
 216         adm_ctx.tconn = conn_get_by_name(adm_ctx.resource_name);
 217
 218         if (!adm_ctx.mdev && (flags & DRBD_ADM_NEED_MINOR)) {
 219                 drbd_msg_put_info("unknown minor");
 220                 return ERR_MINOR_INVALID;
 221         }
 222         if (!adm_ctx.tconn && (flags & DRBD_ADM_NEED_RESOURCE)) {
 223                 drbd_msg_put_info("unknown resource");
 224                 return ERR_INVALID_REQUEST;
 225         }
 226
 227         if (flags & DRBD_ADM_NEED_CONNECTION) {
 228                 if (adm_ctx.tconn && !(flags & DRBD_ADM_NEED_RESOURCE)) {
 229                         drbd_msg_put_info("no resource name expected");
 230                         return ERR_INVALID_REQUEST;
 231                 }
 232                 if (adm_ctx.mdev) {
 233                         drbd_msg_put_info("no minor number expected");
 234                         return ERR_INVALID_REQUEST;
 235                 }
 236                 if (adm_ctx.my_addr && adm_ctx.peer_addr)
 237                         adm_ctx.tconn = conn_get_by_addrs(nla_data(adm_ctx.my_addr),
 238                                                           nla_len(adm_ctx.my_addr),
 239                                                           nla_data(adm_ctx.peer_addr),
 240                                                           nla_len(adm_ctx.peer_addr));
 241                 if (!adm_ctx.tconn) {
 242                         drbd_msg_put_info("unknown connection");
 243                         return ERR_INVALID_REQUEST;
 244                 }
 245         }
 246
 247         /* some more paranoia, if the request was over-determined */
 248         if (adm_ctx.mdev && adm_ctx.tconn &&
 249             adm_ctx.mdev->tconn != adm_ctx.tconn) {
 250                 pr_warning("request: minor=%u, resource=%s; but that minor belongs to connection %s\n",
 251                                 adm_ctx.minor, adm_ctx.resource_name,
 252                                 adm_ctx.mdev->tconn->name);
 253                 drbd_msg_put_info("minor exists in different resource");
 254                 return ERR_INVALID_REQUEST;
 255         }
 256         if (adm_ctx.mdev &&
 257             adm_ctx.volume != VOLUME_UNSPECIFIED &&
 258             adm_ctx.volume != adm_ctx.mdev->vnr) {
 259                 pr_warning("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
 260                                 adm_ctx.minor, adm_ctx.volume,
 261                                 adm_ctx.mdev->vnr, adm_ctx.mdev->tconn->name);
 262                 drbd_msg_put_info("minor exists as different volume");
 263                 return ERR_INVALID_REQUEST;
 264         }
 265
 266         return NO_ERROR;
 267
 268 fail:
 269         nlmsg_free(adm_ctx.reply_skb);
 270         adm_ctx.reply_skb = NULL;
 271         return err;
 272 }
 273
 274 static int drbd_adm_finish(struct genl_info *info, int retcode)
 275 {
 276         if (adm_ctx.tconn) {
 277                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
 278                 adm_ctx.tconn = NULL;
 279         }
 280
 281         if (!adm_ctx.reply_skb)
 282                 return -ENOMEM;
 283
 284         adm_ctx.reply_dh->ret_code = retcode;
 285         drbd_adm_send_reply(adm_ctx.reply_skb, info);
 286         return 0;
 287 }
 288
 289 static void setup_khelper_env(struct drbd_tconn *tconn, char **envp)
 290 {
 291         char *afs;
 292
 293         /* FIXME: A future version will not allow this case. */
 294         if (tconn->my_addr_len == 0 || tconn->peer_addr_len == 0)
 295                 return;
 296
 297         switch (((struct sockaddr *)&tconn->peer_addr)->sa_family) {
 298         case AF_INET6:
 299                 afs = "ipv6";
 300                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
 301                          &((struct sockaddr_in6 *)&tconn->peer_addr)->sin6_addr);
 302                 break;
 303         case AF_INET:
 304                 afs = "ipv4";
 305                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 306                          &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
 307                 break;
 308         default:
 309                 afs = "ssocks";
 310                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 311                          &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
 312         }
 313         snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
 314 }
 315
 316 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
 317 {
 318         char *envp[] = { "HOME=/",
 319                         "TERM=linux",
 320                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 321                          (char[20]) { }, /* address family */
 322                          (char[60]) { }, /* address */
 323                         NULL };
 324         char mb[12];
 325         char *argv[] = {usermode_helper, cmd, mb, NULL };
 326         struct sib_info sib;
 327         int ret;
 328
 329         snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
 330         setup_khelper_env(mdev->tconn, envp);
 331
 332         /* The helper may take some time.
 333          * write out any unsynced meta data changes now */
 334         drbd_md_sync(mdev);
 335
 336         dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
 337         sib.sib_reason = SIB_HELPER_PRE;
 338         sib.helper_name = cmd;
 339         drbd_bcast_event(mdev, &sib);
 340         ret = call_usermodehelper(usermode_helper, argv, envp, 1);
 341         if (ret)
 342                 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 343                                 usermode_helper, cmd, mb,
 344                                 (ret >> 8) & 0xff, ret);
 345         else
 346                 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 347                                 usermode_helper, cmd, mb,
 348                                 (ret >> 8) & 0xff, ret);
 349         sib.sib_reason = SIB_HELPER_POST;
 350         sib.helper_exit_code = ret;
 351         drbd_bcast_event(mdev, &sib);
 352
 353         if (ret < 0) /* Ignore any ERRNOs we got. */
 354                 ret = 0;
 355
 356         return ret;
 357 }
 358
 359 static void conn_md_sync(struct drbd_tconn *tconn)
 360 {
 361         struct drbd_conf *mdev;
 362         int vnr;
 363
 364         rcu_read_lock();
 365         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
 366                 kref_get(&mdev->kref);
 367                 rcu_read_unlock();
 368                 drbd_md_sync(mdev);
 369                 kref_put(&mdev->kref, &drbd_minor_destroy);
 370                 rcu_read_lock();
 371         }
 372         rcu_read_unlock();
 373 }
 374
 375 int conn_khelper(struct drbd_tconn *tconn, char *cmd)
 376 {
 377         char *envp[] = { "HOME=/",
 378                         "TERM=linux",
 379                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 380                          (char[20]) { }, /* address family */
 381                          (char[60]) { }, /* address */
 382                         NULL };
 383         char *argv[] = {usermode_helper, cmd, tconn->name, NULL };
 384         int ret;
 385
 386         setup_khelper_env(tconn, envp);
 387         conn_md_sync(tconn);
 388
 389         conn_info(tconn, "helper command: %s %s %s\n", usermode_helper, cmd, tconn->name);
 390         /* TODO: conn_bcast_event() ?? */
 391
 392         ret = call_usermodehelper(usermode_helper, argv, envp, 1);
 393         if (ret)
 394                 conn_warn(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 395                           usermode_helper, cmd, tconn->name,
 396                           (ret >> 8) & 0xff, ret);
 397         else
 398                 conn_info(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 399                           usermode_helper, cmd, tconn->name,
 400                           (ret >> 8) & 0xff, ret);
 401         /* TODO: conn_bcast_event() ?? */
 402
 403         if (ret < 0) /* Ignore any ERRNOs we got. */
 404                 ret = 0;
 405
 406         return ret;
 407 }
 408
 409 static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
 410 {
 411         enum drbd_fencing_p fp = FP_NOT_AVAIL;
 412         struct drbd_conf *mdev;
 413         int vnr;
 414
 415         rcu_read_lock();
 416         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
 417                 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
 418                         fp = max_t(enum drbd_fencing_p, fp,
 419                                    rcu_dereference(mdev->ldev->disk_conf)->fencing);
 420                         put_ldev(mdev);
 421                 }
 422         }
 423         rcu_read_unlock();
 424
 425         return fp;
 426 }
 427
 428 bool conn_try_outdate_peer(struct drbd_tconn *tconn)
 429 {
 430         union drbd_state mask = { };
 431         union drbd_state val = { };
 432         enum drbd_fencing_p fp;
 433         char *ex_to_string;
 434         int r;
 435
 436         if (tconn->cstate >= C_WF_REPORT_PARAMS) {
 437                 conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");
 438                 return false;
 439         }
 440
 441         fp = highest_fencing_policy(tconn);
 442         switch (fp) {
 443         case FP_NOT_AVAIL:
 444                 conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");
 445                 goto out;
 446         case FP_DONT_CARE:
 447                 return true;
 448         default: ;
 449         }
 450
 451         r = conn_khelper(tconn, "fence-peer");
 452
 453         switch ((r>>8) & 0xff) {
 454         case 3: /* peer is inconsistent */
 455                 ex_to_string = "peer is inconsistent or worse";
 456                 mask.pdsk = D_MASK;
 457                 val.pdsk = D_INCONSISTENT;
 458                 break;
 459         case 4: /* peer got outdated, or was already outdated */
 460                 ex_to_string = "peer was fenced";
 461                 mask.pdsk = D_MASK;
 462                 val.pdsk = D_OUTDATED;
 463                 break;
 464         case 5: /* peer was down */
 465                 if (conn_highest_disk(tconn) == D_UP_TO_DATE) {
 466                         /* we will(have) create(d) a new UUID anyways... */
 467                         ex_to_string = "peer is unreachable, assumed to be dead";
 468                         mask.pdsk = D_MASK;
 469                         val.pdsk = D_OUTDATED;
 470                 } else {
 471                         ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
 472                 }
 473                 break;
 474         case 6: /* Peer is primary, voluntarily outdate myself.
 475                  * This is useful when an unconnected R_SECONDARY is asked to
 476                  * become R_PRIMARY, but finds the other peer being active. */
 477                 ex_to_string = "peer is active";
 478                 conn_warn(tconn, "Peer is primary, outdating myself.\n");
 479                 mask.disk = D_MASK;
 480                 val.disk = D_OUTDATED;
 481                 break;
 482         case 7:
 483                 if (fp != FP_STONITH)
 484                         conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");
 485                 ex_to_string = "peer was stonithed";
 486                 mask.pdsk = D_MASK;
 487                 val.pdsk = D_OUTDATED;
 488                 break;
 489         default:
 490                 /* The script is broken ... */
 491                 conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
 492                 return false; /* Eventually leave IO frozen */
 493         }
 494
 495         conn_info(tconn, "fence-peer helper returned %d (%s)\n",
 496                   (r>>8) & 0xff, ex_to_string);
 497
 498  out:
 499
 500         /* Not using
 501            conn_request_state(tconn, mask, val, CS_VERBOSE);
 502            here, because we might were able to re-establish the connection in the
 503            meantime. */
 504         spin_lock_irq(&tconn->req_lock);
 505         if (tconn->cstate < C_WF_REPORT_PARAMS)
 506                 _conn_request_state(tconn, mask, val, CS_VERBOSE);
 507         spin_unlock_irq(&tconn->req_lock);
 508
 509         return conn_highest_pdsk(tconn) <= D_OUTDATED;
 510 }
 511
 512 static int _try_outdate_peer_async(void *data)
 513 {
 514         struct drbd_tconn *tconn = (struct drbd_tconn *)data;
 515
 516         conn_try_outdate_peer(tconn);
 517
 518         kref_put(&tconn->kref, &conn_destroy);
 519         return 0;
 520 }
 521
 522 void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
 523 {
 524         struct task_struct *opa;
 525
 526         kref_get(&tconn->kref);
 527         opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
 528         if (IS_ERR(opa)) {
 529                 conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
 530                 kref_put(&tconn->kref, &conn_destroy);
 531         }
 532 }
 533
 534 enum drbd_state_rv
 535 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
 536 {
 537         const int max_tries = 4;
 538         enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
 539         struct net_conf *nc;
 540         int try = 0;
 541         int forced = 0;
 542         union drbd_state mask, val;
 543
 544         if (new_role == R_PRIMARY)
 545                 request_ping(mdev->tconn); /* Detect a dead peer ASAP */
 546
 547         mutex_lock(mdev->state_mutex);
 548
 549         mask.i = 0; mask.role = R_MASK;
 550         val.i  = 0; val.role  = new_role;
 551
 552         while (try++ < max_tries) {
 553                 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
 554
 555                 /* in case we first succeeded to outdate,
 556                  * but now suddenly could establish a connection */
 557                 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
 558                         val.pdsk = 0;
 559                         mask.pdsk = 0;
 560                         continue;
 561                 }
 562
 563                 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
 564                     (mdev->state.disk < D_UP_TO_DATE &&
 565                      mdev->state.disk >= D_INCONSISTENT)) {
 566                         mask.disk = D_MASK;
 567                         val.disk  = D_UP_TO_DATE;
 568                         forced = 1;
 569                         continue;
 570                 }
 571
 572                 if (rv == SS_NO_UP_TO_DATE_DISK &&
 573                     mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
 574                         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 575
 576                         if (conn_try_outdate_peer(mdev->tconn)) {
 577                                 val.disk = D_UP_TO_DATE;
 578                                 mask.disk = D_MASK;
 579                         }
 580                         continue;
 581                 }
 582
 583                 if (rv == SS_NOTHING_TO_DO)
 584                         goto out;
 585                 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
 586                         if (!conn_try_outdate_peer(mdev->tconn) && force) {
 587                                 dev_warn(DEV, "Forced into split brain situation!\n");
 588                                 mask.pdsk = D_MASK;
 589                                 val.pdsk  = D_OUTDATED;
 590
 591                         }
 592                         continue;
 593                 }
 594                 if (rv == SS_TWO_PRIMARIES) {
 595                         /* Maybe the peer is detected as dead very soon...
 596                            retry at most once more in this case. */
 597                         int timeo;
 598                         rcu_read_lock();
 599                         nc = rcu_dereference(mdev->tconn->net_conf);
 600                         timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
 601                         rcu_read_unlock();
 602                         schedule_timeout_interruptible(timeo);
 603                         if (try < max_tries)
 604                                 try = max_tries - 1;
 605                         continue;
 606                 }
 607                 if (rv < SS_SUCCESS) {
 608                         rv = _drbd_request_state(mdev, mask, val,
 609                                                 CS_VERBOSE + CS_WAIT_COMPLETE);
 610                         if (rv < SS_SUCCESS)
 611                                 goto out;
 612                 }
 613                 break;
 614         }
 615
 616         if (rv < SS_SUCCESS)
 617                 goto out;
 618
 619         if (forced)
 620                 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
 621
 622         /* Wait until nothing is on the fly :) */
 623         wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
 624
 625         if (new_role == R_SECONDARY) {
 626                 set_disk_ro(mdev->vdisk, true);
 627                 if (get_ldev(mdev)) {
 628                         mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
 629                         put_ldev(mdev);
 630                 }
 631         } else {
 632                 mutex_lock(&mdev->tconn->conf_update);
 633                 nc = mdev->tconn->net_conf;
 634                 if (nc)
 635                         nc->discard_my_data = 0; /* without copy; single bit op is atomic */
 636                 mutex_unlock(&mdev->tconn->conf_update);
 637
 638                 set_disk_ro(mdev->vdisk, false);
 639                 if (get_ldev(mdev)) {
 640                         if (((mdev->state.conn < C_CONNECTED ||
 641                                mdev->state.pdsk <= D_FAILED)
 642                               && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
 643                                 drbd_uuid_new_current(mdev);
 644
 645                         mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
 646                         put_ldev(mdev);
 647                 }
 648         }
 649
 650         /* writeout of activity log covered areas of the bitmap
 651          * to stable storage done in after state change already */
 652
 653         if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
 654                 /* if this was forced, we should consider sync */
 655                 if (forced)
 656                         drbd_send_uuids(mdev);
 657                 drbd_send_state(mdev);
 658         }
 659
 660         drbd_md_sync(mdev);
 661
 662         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
 663 out:
 664         mutex_unlock(mdev->state_mutex);
 665         return rv;
 666 }
 667
 668 static const char *from_attrs_err_to_txt(int err)
 669 {
 670         return  err == -ENOMSG ? "required attribute missing" :
 671                 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
 672                 err == -EEXIST ? "can not change invariant setting" :
 673                 "invalid attribute value";
 674 }
 675
 676 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
 677 {
 678         struct set_role_parms parms;
 679         int err;
 680         enum drbd_ret_code retcode;
 681
 682         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
 683         if (!adm_ctx.reply_skb)
 684                 return retcode;
 685         if (retcode != NO_ERROR)
 686                 goto out;
 687
 688         memset(&parms, 0, sizeof(parms));
 689         if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
 690                 err = set_role_parms_from_attrs(&parms, info);
 691                 if (err) {
 692                         retcode = ERR_MANDATORY_TAG;
 693                         drbd_msg_put_info(from_attrs_err_to_txt(err));
 694                         goto out;
 695                 }
 696         }
 697
 698         if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
 699                 retcode = drbd_set_role(adm_ctx.mdev, R_PRIMARY, parms.assume_uptodate);
 700         else
 701                 retcode = drbd_set_role(adm_ctx.mdev, R_SECONDARY, 0);
 702 out:
 703         drbd_adm_finish(info, retcode);
 704         return 0;
 705 }
 706
 707 /* initializes the md.*_offset members, so we are able to find
 708  * the on disk meta data */
 709 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
 710                                        struct drbd_backing_dev *bdev)
 711 {
 712         sector_t md_size_sect = 0;
 713         int meta_dev_idx;
 714
 715         rcu_read_lock();
 716         meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
 717
 718         switch (meta_dev_idx) {
 719         default:
 720                 /* v07 style fixed size indexed meta data */
 721                 bdev->md.md_size_sect = MD_RESERVED_SECT;
 722                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 723                 bdev->md.al_offset = MD_AL_OFFSET;
 724                 bdev->md.bm_offset = MD_BM_OFFSET;
 725                 break;
 726         case DRBD_MD_INDEX_FLEX_EXT:
 727                 /* just occupy the full device; unit: sectors */
 728                 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
 729                 bdev->md.md_offset = 0;
 730                 bdev->md.al_offset = MD_AL_OFFSET;
 731                 bdev->md.bm_offset = MD_BM_OFFSET;
 732                 break;
 733         case DRBD_MD_INDEX_INTERNAL:
 734         case DRBD_MD_INDEX_FLEX_INT:
 735                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 736                 /* al size is still fixed */
 737                 bdev->md.al_offset = -MD_AL_SECTORS;
 738                 /* we need (slightly less than) ~ this much bitmap sectors: */
 739                 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
 740                 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
 741                 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
 742                 md_size_sect = ALIGN(md_size_sect, 8);
 743
 744                 /* plus the "drbd meta data super block",
 745                  * and the activity log; */
 746                 md_size_sect += MD_BM_OFFSET;
 747
 748                 bdev->md.md_size_sect = md_size_sect;
 749                 /* bitmap offset is adjusted by 'super' block size */
 750                 bdev->md.bm_offset   = -md_size_sect + MD_AL_OFFSET;
 751                 break;
 752         }
 753         rcu_read_unlock();
 754 }
 755
 756 /* input size is expected to be in KB */
 757 char *ppsize(char *buf, unsigned long long size)
 758 {
 759         /* Needs 9 bytes at max including trailing NUL:
 760          * -1ULL ==> "16384 EB" */
 761         static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
 762         int base = 0;
 763         while (size >= 10000 && base < sizeof(units)-1) {
 764                 /* shift + round */
 765                 size = (size >> 10) + !!(size & (1<<9));
 766                 base++;
 767         }
 768         sprintf(buf, "%u %cB", (unsigned)size, units[base]);
 769
 770         return buf;
 771 }
 772
 773 /* there is still a theoretical deadlock when called from receiver
 774  * on an D_INCONSISTENT R_PRIMARY:
 775  *  remote READ does inc_ap_bio, receiver would need to receive answer
 776  *  packet from remote to dec_ap_bio again.
 777  *  receiver receive_sizes(), comes here,
 778  *  waits for ap_bio_cnt == 0. -> deadlock.
 779  * but this cannot happen, actually, because:
 780  *  R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
 781  *  (not connected, or bad/no disk on peer):
 782  *  see drbd_fail_request_early, ap_bio_cnt is zero.
 783  *  R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
 784  *  peer may not initiate a resize.
 785  */
 786 /* Note these are not to be confused with
 787  * drbd_adm_suspend_io/drbd_adm_resume_io,
 788  * which are (sub) state changes triggered by admin (drbdsetup),
 789  * and can be long lived.
 790  * This changes an mdev->flag, is triggered by drbd internals,
 791  * and should be short-lived. */
 792 void drbd_suspend_io(struct drbd_conf *mdev)
 793 {
 794         set_bit(SUSPEND_IO, &mdev->flags);
 795         if (drbd_suspended(mdev))
 796                 return;
 797         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
 798 }
 799
 800 void drbd_resume_io(struct drbd_conf *mdev)
 801 {
 802         clear_bit(SUSPEND_IO, &mdev->flags);
 803         wake_up(&mdev->misc_wait);
 804 }
 805
 806 /**
 807  * drbd_determine_dev_size() -  Sets the right device size obeying all constraints
 808  * @mdev:       DRBD device.
 809  *
 810  * Returns 0 on success, negative return values indicate errors.
 811  * You should call drbd_md_sync() after calling this function.
 812  */
 813 enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
 814 {
 815         sector_t prev_first_sect, prev_size; /* previous meta location */
 816         sector_t la_size, u_size;
 817         sector_t size;
 818         char ppb[10];
 819
 820         int md_moved, la_size_changed;
 821         enum determine_dev_size rv = unchanged;
 822
 823         /* race:
 824          * application request passes inc_ap_bio,
 825          * but then cannot get an AL-reference.
 826          * this function later may wait on ap_bio_cnt == 0. -> deadlock.
 827          *
 828          * to avoid that:
 829          * Suspend IO right here.
 830          * still lock the act_log to not trigger ASSERTs there.
 831          */
 832         drbd_suspend_io(mdev);
 833
 834         /* no wait necessary anymore, actually we could assert that */
 835         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
 836
 837         prev_first_sect = drbd_md_first_sector(mdev->ldev);
 838         prev_size = mdev->ldev->md.md_size_sect;
 839         la_size = mdev->ldev->md.la_size_sect;
 840
 841         /* TODO: should only be some assert here, not (re)init... */
 842         drbd_md_set_sector_offsets(mdev, mdev->ldev);
 843
 844         rcu_read_lock();
 845         u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
 846         rcu_read_unlock();
 847         size = drbd_new_dev_size(mdev, mdev->ldev, u_size, flags & DDSF_FORCED);
 848
 849         if (drbd_get_capacity(mdev->this_bdev) != size ||
 850             drbd_bm_capacity(mdev) != size) {
 851                 int err;
 852                 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
 853                 if (unlikely(err)) {
 854                         /* currently there is only one error: ENOMEM! */
 855                         size = drbd_bm_capacity(mdev)>>1;
 856                         if (size == 0) {
 857                                 dev_err(DEV, "OUT OF MEMORY! "
 858                                     "Could not allocate bitmap!\n");
 859                         } else {
 860                                 dev_err(DEV, "BM resizing failed. "
 861                                     "Leaving size unchanged at size = %lu KB\n",
 862                                     (unsigned long)size);
 863                         }
 864                         rv = dev_size_error;
 865                 }
 866                 /* racy, see comments above. */
 867                 drbd_set_my_capacity(mdev, size);
 868                 mdev->ldev->md.la_size_sect = size;
 869                 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
 870                      (unsigned long long)size>>1);
 871         }
 872         if (rv == dev_size_error)
 873                 goto out;
 874
 875         la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
 876
 877         md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
 878                 || prev_size       != mdev->ldev->md.md_size_sect;
 879
 880         if (la_size_changed || md_moved) {
 881                 int err;
 882
 883                 drbd_al_shrink(mdev); /* All extents inactive. */
 884                 dev_info(DEV, "Writing the whole bitmap, %s\n",
 885                          la_size_changed && md_moved ? "size changed and md moved" :
 886                          la_size_changed ? "size changed" : "md moved");
 887                 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
 888                 err = drbd_bitmap_io(mdev, &drbd_bm_write,
 889                                 "size changed", BM_LOCKED_MASK);
 890                 if (err) {
 891                         rv = dev_size_error;
 892                         goto out;
 893                 }
 894                 drbd_md_mark_dirty(mdev);
 895         }
 896
 897         if (size > la_size)
 898                 rv = grew;
 899         if (size < la_size)
 900                 rv = shrunk;
 901 out:
 902         lc_unlock(mdev->act_log);
 903         wake_up(&mdev->al_wait);
 904         drbd_resume_io(mdev);
 905
 906         return rv;
 907 }
 908
 909 sector_t
 910 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
 911                   sector_t u_size, int assume_peer_has_space)
 912 {
 913         sector_t p_size = mdev->p_size;   /* partner's disk size. */
 914         sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
 915         sector_t m_size; /* my size */
 916         sector_t size = 0;
 917
 918         m_size = drbd_get_max_capacity(bdev);
 919
 920         if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
 921                 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
 922                 p_size = m_size;
 923         }
 924
 925         if (p_size && m_size) {
 926                 size = min_t(sector_t, p_size, m_size);
 927         } else {
 928                 if (la_size) {
 929                         size = la_size;
 930                         if (m_size && m_size < size)
 931                                 size = m_size;
 932                         if (p_size && p_size < size)
 933                                 size = p_size;
 934                 } else {
 935                         if (m_size)
 936                                 size = m_size;
 937                         if (p_size)
 938                                 size = p_size;
 939                 }
 940         }
 941
 942         if (size == 0)
 943                 dev_err(DEV, "Both nodes diskless!\n");
 944
 945         if (u_size) {
 946                 if (u_size > size)
 947                         dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
 948                             (unsigned long)u_size>>1, (unsigned long)size>>1);
 949                 else
 950                         size = u_size;
 951         }
 952
 953         return size;
 954 }
 955
 956 /**
 957  * drbd_check_al_size() - Ensures that the AL is of the right size
 958  * @mdev:       DRBD device.
 959  *
 960  * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
 961  * failed, and 0 on success. You should call drbd_md_sync() after you called
 962  * this function.
 963  */
 964 static int drbd_check_al_size(struct drbd_conf *mdev, struct disk_conf *dc)
 965 {
 966         struct lru_cache *n, *t;
 967         struct lc_element *e;
 968         unsigned int in_use;
 969         int i;
 970
 971         if (mdev->act_log &&
 972             mdev->act_log->nr_elements == dc->al_extents)
 973                 return 0;
 974
 975         in_use = 0;
 976         t = mdev->act_log;
 977         n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
 978                 dc->al_extents, sizeof(struct lc_element), 0);
 979
 980         if (n == NULL) {
 981                 dev_err(DEV, "Cannot allocate act_log lru!\n");
 982                 return -ENOMEM;
 983         }
 984         spin_lock_irq(&mdev->al_lock);
 985         if (t) {
 986                 for (i = 0; i < t->nr_elements; i++) {
 987                         e = lc_element_by_index(t, i);
 988                         if (e->refcnt)
 989                                 dev_err(DEV, "refcnt(%d)==%d\n",
 990                                     e->lc_number, e->refcnt);
 991                         in_use += e->refcnt;
 992                 }
 993         }
 994         if (!in_use)
 995                 mdev->act_log = n;
 996         spin_unlock_irq(&mdev->al_lock);
 997         if (in_use) {
 998                 dev_err(DEV, "Activity log still in use!\n");
 999                 lc_destroy(n);
1000                 return -EBUSY;
1001         } else {
1002                 if (t)
1003                         lc_destroy(t);
1004         }
1005         drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
1006         return 0;
1007 }
1008
1009 static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
1010 {
1011         struct request_queue * const q = mdev->rq_queue;
1012         int max_hw_sectors = max_bio_size >> 9;
1013         int max_segments = 0;
1014
1015         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1016                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1017
1018                 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
1019                 rcu_read_lock();
1020                 max_segments = rcu_dereference(mdev->ldev->disk_conf)->max_bio_bvecs;
1021                 rcu_read_unlock();
1022                 put_ldev(mdev);
1023         }
1024
1025         blk_queue_logical_block_size(q, 512);
1026         blk_queue_max_hw_sectors(q, max_hw_sectors);
1027         /* This is the workaround for "bio would need to, but cannot, be split" */
1028         blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1029         blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
1030
1031         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1032                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1033
1034                 blk_queue_stack_limits(q, b);
1035
1036                 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
1037                         dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
1038                                  q->backing_dev_info.ra_pages,
1039                                  b->backing_dev_info.ra_pages);
1040                         q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1041                 }
1042                 put_ldev(mdev);
1043         }
1044 }
1045
1046 void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
1047 {
1048         int now, new, local, peer;
1049
1050         now = queue_max_hw_sectors(mdev->rq_queue) << 9;
1051         local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
1052         peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
1053
1054         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1055                 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
1056                 mdev->local_max_bio_size = local;
1057                 put_ldev(mdev);
1058         }
1059
1060         /* We may ignore peer limits if the peer is modern enough.
1061            Because new from 8.3.8 onwards the peer can use multiple
1062            BIOs for a single peer_request */
1063         if (mdev->state.conn >= C_CONNECTED) {
1064                 if (mdev->tconn->agreed_pro_version < 94)
1065                         peer = min_t(int, mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
1066                         /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
1067                 else if (mdev->tconn->agreed_pro_version == 94)
1068                         peer = DRBD_MAX_SIZE_H80_PACKET;
1069                 else if (mdev->tconn->agreed_pro_version < 100)
1070                         peer = DRBD_MAX_BIO_SIZE_P95;  /* drbd 8.3.8 onwards, before 8.4.0 */
1071                 else
1072                         peer = DRBD_MAX_BIO_SIZE;
1073         }
1074
1075         new = min_t(int, local, peer);
1076
1077         if (mdev->state.role == R_PRIMARY && new < now)
1078                 dev_err(DEV, "ASSERT FAILED new < now; (%d < %d)\n", new, now);
1079
1080         if (new != now)
1081                 dev_info(DEV, "max BIO size = %u\n", new);
1082
1083         drbd_setup_queue_param(mdev, new);
1084 }
1085
1086 /* Starts the worker thread */
1087 static void conn_reconfig_start(struct drbd_tconn *tconn)
1088 {
1089         drbd_thread_start(&tconn->worker);
1090         conn_flush_workqueue(tconn);
1091 }
1092
1093 /* if still unconfigured, stops worker again. */
1094 static void conn_reconfig_done(struct drbd_tconn *tconn)
1095 {
1096         bool stop_threads;
1097         spin_lock_irq(&tconn->req_lock);
1098         stop_threads = conn_all_vols_unconf(tconn) &&
1099                 tconn->cstate == C_STANDALONE;
1100         spin_unlock_irq(&tconn->req_lock);
1101         if (stop_threads) {
1102                 /* asender is implicitly stopped by receiver
1103                  * in conn_disconnect() */
1104                 drbd_thread_stop(&tconn->receiver);
1105                 drbd_thread_stop(&tconn->worker);
1106         }
1107 }
1108
1109 /* Make sure IO is suspended before calling this function(). */
1110 static void drbd_suspend_al(struct drbd_conf *mdev)
1111 {
1112         int s = 0;
1113
1114         if (!lc_try_lock(mdev->act_log)) {
1115                 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
1116                 return;
1117         }
1118
1119         drbd_al_shrink(mdev);
1120         spin_lock_irq(&mdev->tconn->req_lock);
1121         if (mdev->state.conn < C_CONNECTED)
1122                 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
1123         spin_unlock_irq(&mdev->tconn->req_lock);
1124         lc_unlock(mdev->act_log);
1125
1126         if (s)
1127                 dev_info(DEV, "Suspended AL updates\n");
1128 }
1129
1130
1131 static bool should_set_defaults(struct genl_info *info)
1132 {
1133         unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1134         return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1135 }
1136
1137 static void enforce_disk_conf_limits(struct disk_conf *dc)
1138 {
1139         if (dc->al_extents < DRBD_AL_EXTENTS_MIN)
1140                 dc->al_extents = DRBD_AL_EXTENTS_MIN;
1141         if (dc->al_extents > DRBD_AL_EXTENTS_MAX)
1142                 dc->al_extents = DRBD_AL_EXTENTS_MAX;
1143
1144         if (dc->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1145                 dc->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1146 }
1147
1148 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1149 {
1150         enum drbd_ret_code retcode;
1151         struct drbd_conf *mdev;
1152         struct disk_conf *new_disk_conf, *old_disk_conf;
1153         struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
1154         int err, fifo_size;
1155
1156         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1157         if (!adm_ctx.reply_skb)
1158                 return retcode;
1159         if (retcode != NO_ERROR)
1160                 goto out;
1161
1162         mdev = adm_ctx.mdev;
1163
1164         /* we also need a disk
1165          * to change the options on */
1166         if (!get_ldev(mdev)) {
1167                 retcode = ERR_NO_DISK;
1168                 goto out;
1169         }
1170
1171         new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
1172         if (!new_disk_conf) {
1173                 retcode = ERR_NOMEM;
1174                 goto fail;
1175         }
1176
1177         mutex_lock(&mdev->tconn->conf_update);
1178         old_disk_conf = mdev->ldev->disk_conf;
1179         *new_disk_conf = *old_disk_conf;
1180         if (should_set_defaults(info))
1181                 set_disk_conf_defaults(new_disk_conf);
1182
1183         err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1184         if (err && err != -ENOMSG) {
1185                 retcode = ERR_MANDATORY_TAG;
1186                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1187         }
1188
1189         if (!expect(new_disk_conf->resync_rate >= 1))
1190                 new_disk_conf->resync_rate = 1;
1191
1192         enforce_disk_conf_limits(new_disk_conf);
1193
1194         fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1195         if (fifo_size != mdev->rs_plan_s->size) {
1196                 new_plan = fifo_alloc(fifo_size);
1197                 if (!new_plan) {
1198                         dev_err(DEV, "kmalloc of fifo_buffer failed");
1199                         retcode = ERR_NOMEM;
1200                         goto fail_unlock;
1201                 }
1202         }
1203
1204         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1205         drbd_al_shrink(mdev);
1206         err = drbd_check_al_size(mdev, new_disk_conf);
1207         lc_unlock(mdev->act_log);
1208         wake_up(&mdev->al_wait);
1209
1210         if (err) {
1211                 retcode = ERR_NOMEM;
1212                 goto fail_unlock;
1213         }
1214
1215         write_lock_irq(&global_state_lock);
1216         retcode = drbd_resync_after_valid(mdev, new_disk_conf->resync_after);
1217         if (retcode == NO_ERROR) {
1218                 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
1219                 drbd_resync_after_changed(mdev);
1220         }
1221         write_unlock_irq(&global_state_lock);
1222
1223         if (retcode != NO_ERROR)
1224                 goto fail_unlock;
1225
1226         if (new_plan) {
1227                 old_plan = mdev->rs_plan_s;
1228                 rcu_assign_pointer(mdev->rs_plan_s, new_plan);
1229         }
1230
1231         mutex_unlock(&mdev->tconn->conf_update);
1232         drbd_md_sync(mdev);
1233
1234         if (mdev->state.conn >= C_CONNECTED)
1235                 drbd_send_sync_param(mdev);
1236
1237         synchronize_rcu();
1238         kfree(old_disk_conf);
1239         kfree(old_plan);
1240         mod_timer(&mdev->request_timer, jiffies + HZ);
1241         goto success;
1242
1243 fail_unlock:
1244         mutex_unlock(&mdev->tconn->conf_update);
1245  fail:
1246         kfree(new_disk_conf);
1247         kfree(new_plan);
1248 success:
1249         put_ldev(mdev);
1250  out:
1251         drbd_adm_finish(info, retcode);
1252         return 0;
1253 }
1254
1255 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1256 {
1257         struct drbd_conf *mdev;
1258         int err;
1259         enum drbd_ret_code retcode;
1260         enum determine_dev_size dd;
1261         sector_t max_possible_sectors;
1262         sector_t min_md_device_sectors;
1263         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1264         struct disk_conf *new_disk_conf = NULL;
1265         struct block_device *bdev;
1266         struct lru_cache *resync_lru = NULL;
1267         struct fifo_buffer *new_plan = NULL;
1268         union drbd_state ns, os;
1269         enum drbd_state_rv rv;
1270         struct net_conf *nc;
1271
1272         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1273         if (!adm_ctx.reply_skb)
1274                 return retcode;
1275         if (retcode != NO_ERROR)
1276                 goto finish;
1277
1278         mdev = adm_ctx.mdev;
1279         conn_reconfig_start(mdev->tconn);
1280
1281         /* if you want to reconfigure, please tear down first */
1282         if (mdev->state.disk > D_DISKLESS) {
1283                 retcode = ERR_DISK_CONFIGURED;
1284                 goto fail;
1285         }
1286         /* It may just now have detached because of IO error.  Make sure
1287          * drbd_ldev_destroy is done already, we may end up here very fast,
1288          * e.g. if someone calls attach from the on-io-error handler,
1289          * to realize a "hot spare" feature (not that I'd recommend that) */
1290         wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1291
1292         /* allocation not in the IO path, drbdsetup context */
1293         nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1294         if (!nbc) {
1295                 retcode = ERR_NOMEM;
1296                 goto fail;
1297         }
1298         new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1299         if (!new_disk_conf) {
1300                 retcode = ERR_NOMEM;
1301                 goto fail;
1302         }
1303         nbc->disk_conf = new_disk_conf;
1304
1305         set_disk_conf_defaults(new_disk_conf);
1306         err = disk_conf_from_attrs(new_disk_conf, info);
1307         if (err) {
1308                 retcode = ERR_MANDATORY_TAG;
1309                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1310                 goto fail;
1311         }
1312
1313         enforce_disk_conf_limits(new_disk_conf);
1314
1315         new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1316         if (!new_plan) {
1317                 retcode = ERR_NOMEM;
1318                 goto fail;
1319         }
1320
1321         if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1322                 retcode = ERR_MD_IDX_INVALID;
1323                 goto fail;
1324         }
1325
1326         rcu_read_lock();
1327         nc = rcu_dereference(mdev->tconn->net_conf);
1328         if (nc) {
1329                 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1330                         rcu_read_unlock();
1331                         retcode = ERR_STONITH_AND_PROT_A;
1332                         goto fail;
1333                 }
1334         }
1335         rcu_read_unlock();
1336
1337         bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
1338                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
1339         if (IS_ERR(bdev)) {
1340                 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
1341                         PTR_ERR(bdev));
1342                 retcode = ERR_OPEN_DISK;
1343                 goto fail;
1344         }
1345         nbc->backing_bdev = bdev;
1346
1347         /*
1348          * meta_dev_idx >= 0: external fixed size, possibly multiple
1349          * drbd sharing one meta device.  TODO in that case, paranoia
1350          * check that [md_bdev, meta_dev_idx] is not yet used by some
1351          * other drbd minor!  (if you use drbd.conf + drbdadm, that
1352          * should check it for you already; but if you don't, or
1353          * someone fooled it, we need to double check here)
1354          */
1355         bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
1356                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1357                                   (new_disk_conf->meta_dev_idx < 0) ?
1358                                   (void *)mdev : (void *)drbd_m_holder);
1359         if (IS_ERR(bdev)) {
1360                 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
1361                         PTR_ERR(bdev));
1362                 retcode = ERR_OPEN_MD_DISK;
1363                 goto fail;
1364         }
1365         nbc->md_bdev = bdev;
1366
1367         if ((nbc->backing_bdev == nbc->md_bdev) !=
1368             (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1369              new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1370                 retcode = ERR_MD_IDX_INVALID;
1371                 goto fail;
1372         }
1373
1374         resync_lru = lc_create("resync", drbd_bm_ext_cache,
1375                         1, 61, sizeof(struct bm_extent),
1376                         offsetof(struct bm_extent, lce));
1377         if (!resync_lru) {
1378                 retcode = ERR_NOMEM;
1379                 goto fail;
1380         }
1381
1382         /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1383         drbd_md_set_sector_offsets(mdev, nbc);
1384
1385         if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
1386                 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1387                         (unsigned long long) drbd_get_max_capacity(nbc),
1388                         (unsigned long long) new_disk_conf->disk_size);
1389                 retcode = ERR_DISK_TOO_SMALL;
1390                 goto fail;
1391         }
1392
1393         if (new_disk_conf->meta_dev_idx < 0) {
1394                 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1395                 /* at least one MB, otherwise it does not make sense */
1396                 min_md_device_sectors = (2<<10);
1397         } else {
1398                 max_possible_sectors = DRBD_MAX_SECTORS;
1399                 min_md_device_sectors = MD_RESERVED_SECT * (new_disk_conf->meta_dev_idx + 1);
1400         }
1401
1402         if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1403                 retcode = ERR_MD_DISK_TOO_SMALL;
1404                 dev_warn(DEV, "refusing attach: md-device too small, "
1405                      "at least %llu sectors needed for this meta-disk type\n",
1406                      (unsigned long long) min_md_device_sectors);
1407                 goto fail;
1408         }
1409
1410         /* Make sure the new disk is big enough
1411          * (we may currently be R_PRIMARY with no local disk...) */
1412         if (drbd_get_max_capacity(nbc) <
1413             drbd_get_capacity(mdev->this_bdev)) {
1414                 retcode = ERR_DISK_TOO_SMALL;
1415                 goto fail;
1416         }
1417
1418         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1419
1420         if (nbc->known_size > max_possible_sectors) {
1421                 dev_warn(DEV, "==> truncating very big lower level device "
1422                         "to currently maximum possible %llu sectors <==\n",
1423                         (unsigned long long) max_possible_sectors);
1424                 if (new_disk_conf->meta_dev_idx >= 0)
1425                         dev_warn(DEV, "==>> using internal or flexible "
1426                                       "meta data may help <<==\n");
1427         }
1428
1429         drbd_suspend_io(mdev);
1430         /* also wait for the last barrier ack. */
1431         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || drbd_suspended(mdev));
1432         /* and for any other previously queued work */
1433         drbd_flush_workqueue(mdev);
1434
1435         rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1436         retcode = rv;  /* FIXME: Type mismatch. */
1437         drbd_resume_io(mdev);
1438         if (rv < SS_SUCCESS)
1439                 goto fail;
1440
1441         if (!get_ldev_if_state(mdev, D_ATTACHING))
1442                 goto force_diskless;
1443
1444         drbd_md_set_sector_offsets(mdev, nbc);
1445
1446         if (!mdev->bitmap) {
1447                 if (drbd_bm_init(mdev)) {
1448                         retcode = ERR_NOMEM;
1449                         goto force_diskless_dec;
1450                 }
1451         }
1452
1453         retcode = drbd_md_read(mdev, nbc);
1454         if (retcode != NO_ERROR)
1455                 goto force_diskless_dec;
1456
1457         if (mdev->state.conn < C_CONNECTED &&
1458             mdev->state.role == R_PRIMARY &&
1459             (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1460                 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1461                     (unsigned long long)mdev->ed_uuid);
1462                 retcode = ERR_DATA_NOT_CURRENT;
1463                 goto force_diskless_dec;
1464         }
1465
1466         /* Since we are diskless, fix the activity log first... */
1467         if (drbd_check_al_size(mdev, new_disk_conf)) {
1468                 retcode = ERR_NOMEM;
1469                 goto force_diskless_dec;
1470         }
1471
1472         /* Prevent shrinking of consistent devices ! */
1473         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1474             drbd_new_dev_size(mdev, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
1475                 dev_warn(DEV, "refusing to truncate a consistent device\n");
1476                 retcode = ERR_DISK_TOO_SMALL;
1477                 goto force_diskless_dec;
1478         }
1479
1480         /* Reset the "barriers don't work" bits here, then force meta data to
1481          * be written, to ensure we determine if barriers are supported. */
1482         if (new_disk_conf->md_flushes)
1483                 clear_bit(MD_NO_FUA, &mdev->flags);
1484         else
1485                 set_bit(MD_NO_FUA, &mdev->flags);
1486
1487         /* Point of no return reached.
1488          * Devices and memory are no longer released by error cleanup below.
1489          * now mdev takes over responsibility, and the state engine should
1490          * clean it up somewhere.  */
1491         D_ASSERT(mdev->ldev == NULL);
1492         mdev->ldev = nbc;
1493         mdev->resync = resync_lru;
1494         mdev->rs_plan_s = new_plan;
1495         nbc = NULL;
1496         resync_lru = NULL;
1497         new_disk_conf = NULL;
1498         new_plan = NULL;
1499
1500         mdev->write_ordering = WO_bdev_flush;
1501         drbd_bump_write_ordering(mdev, WO_bdev_flush);
1502
1503         if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1504                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1505         else
1506                 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1507
1508         if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1509             !(mdev->state.role == R_PRIMARY && mdev->tconn->susp_nod))
1510                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1511
1512         mdev->send_cnt = 0;
1513         mdev->recv_cnt = 0;
1514         mdev->read_cnt = 0;
1515         mdev->writ_cnt = 0;
1516
1517         drbd_reconsider_max_bio_size(mdev);
1518
1519         /* If I am currently not R_PRIMARY,
1520          * but meta data primary indicator is set,
1521          * I just now recover from a hard crash,
1522          * and have been R_PRIMARY before that crash.
1523          *
1524          * Now, if I had no connection before that crash
1525          * (have been degraded R_PRIMARY), chances are that
1526          * I won't find my peer now either.
1527          *
1528          * In that case, and _only_ in that case,
1529          * we use the degr-wfc-timeout instead of the default,
1530          * so we can automatically recover from a crash of a
1531          * degraded but active "cluster" after a certain timeout.
1532          */
1533         clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1534         if (mdev->state.role != R_PRIMARY &&
1535              drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1536             !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1537                 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1538
1539         dd = drbd_determine_dev_size(mdev, 0);
1540         if (dd == dev_size_error) {
1541                 retcode = ERR_NOMEM_BITMAP;
1542                 goto force_diskless_dec;
1543         } else if (dd == grew)
1544                 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1545
1546         if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1547                 dev_info(DEV, "Assuming that all blocks are out of sync "
1548                      "(aka FullSync)\n");
1549                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1550                         "set_n_write from attaching", BM_LOCKED_MASK)) {
1551                         retcode = ERR_IO_MD_DISK;
1552                         goto force_diskless_dec;
1553                 }
1554         } else {
1555                 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1556                         "read from attaching", BM_LOCKED_MASK)) {
1557                         retcode = ERR_IO_MD_DISK;
1558                         goto force_diskless_dec;
1559                 }
1560         }
1561
1562         if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1563                 drbd_suspend_al(mdev); /* IO is still suspended here... */
1564
1565         spin_lock_irq(&mdev->tconn->req_lock);
1566         os = drbd_read_state(mdev);
1567         ns = os;
1568         /* If MDF_CONSISTENT is not set go into inconsistent state,
1569            otherwise investigate MDF_WasUpToDate...
1570            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1571            otherwise into D_CONSISTENT state.
1572         */
1573         if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1574                 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1575                         ns.disk = D_CONSISTENT;
1576                 else
1577                         ns.disk = D_OUTDATED;
1578         } else {
1579                 ns.disk = D_INCONSISTENT;
1580         }
1581
1582         if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1583                 ns.pdsk = D_OUTDATED;
1584
1585         rcu_read_lock();
1586         if (ns.disk == D_CONSISTENT &&
1587             (ns.pdsk == D_OUTDATED || rcu_dereference(mdev->ldev->disk_conf)->fencing == FP_DONT_CARE))
1588                 ns.disk = D_UP_TO_DATE;
1589         rcu_read_unlock();
1590
1591         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1592            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1593            this point, because drbd_request_state() modifies these
1594            flags. */
1595
1596         /* In case we are C_CONNECTED postpone any decision on the new disk
1597            state after the negotiation phase. */
1598         if (mdev->state.conn == C_CONNECTED) {
1599                 mdev->new_state_tmp.i = ns.i;
1600                 ns.i = os.i;
1601                 ns.disk = D_NEGOTIATING;
1602
1603                 /* We expect to receive up-to-date UUIDs soon.
1604                    To avoid a race in receive_state, free p_uuid while
1605                    holding req_lock. I.e. atomic with the state change */
1606                 kfree(mdev->p_uuid);
1607                 mdev->p_uuid = NULL;
1608         }
1609
1610         rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1611         spin_unlock_irq(&mdev->tconn->req_lock);
1612
1613         if (rv < SS_SUCCESS)
1614                 goto force_diskless_dec;
1615
1616         mod_timer(&mdev->request_timer, jiffies + HZ);
1617
1618         if (mdev->state.role == R_PRIMARY)
1619                 mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1620         else
1621                 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1622
1623         drbd_md_mark_dirty(mdev);
1624         drbd_md_sync(mdev);
1625
1626         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1627         put_ldev(mdev);
1628         conn_reconfig_done(mdev->tconn);
1629         drbd_adm_finish(info, retcode);
1630         return 0;
1631
1632  force_diskless_dec:
1633         put_ldev(mdev);
1634  force_diskless:
1635         drbd_force_state(mdev, NS(disk, D_DISKLESS));
1636         drbd_md_sync(mdev);
1637  fail:
1638         conn_reconfig_done(mdev->tconn);
1639         if (nbc) {
1640                 if (nbc->backing_bdev)
1641                         blkdev_put(nbc->backing_bdev,
1642                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1643                 if (nbc->md_bdev)
1644                         blkdev_put(nbc->md_bdev,
1645                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1646                 kfree(nbc);
1647         }
1648         kfree(new_disk_conf);
1649         lc_destroy(resync_lru);
1650         kfree(new_plan);
1651
1652  finish:
1653         drbd_adm_finish(info, retcode);
1654         return 0;
1655 }
1656
1657 static int adm_detach(struct drbd_conf *mdev, int force)
1658 {
1659         enum drbd_state_rv retcode;
1660         int ret;
1661
1662         if (force) {
1663                 drbd_force_state(mdev, NS(disk, D_FAILED));
1664                 retcode = SS_SUCCESS;
1665                 goto out;
1666         }
1667
1668         drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1669         retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1670         /* D_FAILED will transition to DISKLESS. */
1671         ret = wait_event_interruptible(mdev->misc_wait,
1672                         mdev->state.disk != D_FAILED);
1673         drbd_resume_io(mdev);
1674         if ((int)retcode == (int)SS_IS_DISKLESS)
1675                 retcode = SS_NOTHING_TO_DO;
1676         if (ret)
1677                 retcode = ERR_INTR;
1678 out:
1679         return retcode;
1680 }
1681
1682 /* Detaching the disk is a process in multiple stages.  First we need to lock
1683  * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1684  * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1685  * internal references as well.
1686  * Only then we have finally detached. */
1687 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
1688 {
1689         enum drbd_ret_code retcode;
1690         struct detach_parms parms = { };
1691         int err;
1692
1693         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1694         if (!adm_ctx.reply_skb)
1695                 return retcode;
1696         if (retcode != NO_ERROR)
1697                 goto out;
1698
1699         if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
1700                 err = detach_parms_from_attrs(&parms, info);
1701                 if (err) {
1702                         retcode = ERR_MANDATORY_TAG;
1703                         drbd_msg_put_info(from_attrs_err_to_txt(err));
1704                         goto out;
1705                 }
1706         }
1707
1708         retcode = adm_detach(adm_ctx.mdev, parms.force_detach);
1709 out:
1710         drbd_adm_finish(info, retcode);
1711         return 0;
1712 }
1713
1714 static bool conn_resync_running(struct drbd_tconn *tconn)
1715 {
1716         struct drbd_conf *mdev;
1717         bool rv = false;
1718         int vnr;
1719
1720         rcu_read_lock();
1721         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1722                 if (mdev->state.conn == C_SYNC_SOURCE ||
1723                     mdev->state.conn == C_SYNC_TARGET ||
1724                     mdev->state.conn == C_PAUSED_SYNC_S ||
1725                     mdev->state.conn == C_PAUSED_SYNC_T) {
1726                         rv = true;
1727                         break;
1728                 }
1729         }
1730         rcu_read_unlock();
1731
1732         return rv;
1733 }
1734
1735 static bool conn_ov_running(struct drbd_tconn *tconn)
1736 {
1737         struct drbd_conf *mdev;
1738         bool rv = false;
1739         int vnr;
1740
1741         rcu_read_lock();
1742         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1743                 if (mdev->state.conn == C_VERIFY_S ||
1744                     mdev->state.conn == C_VERIFY_T) {
1745                         rv = true;
1746                         break;
1747                 }
1748         }
1749         rcu_read_unlock();
1750
1751         return rv;
1752 }
1753
1754 static enum drbd_ret_code
1755 _check_net_options(struct drbd_tconn *tconn, struct net_conf *old_conf, struct net_conf *new_conf)
1756 {
1757         struct drbd_conf *mdev;
1758         int i;
1759
1760         if (old_conf && tconn->cstate == C_WF_REPORT_PARAMS && tconn->agreed_pro_version < 100) {
1761                 if (new_conf->wire_protocol != old_conf->wire_protocol)
1762                         return ERR_NEED_APV_100;
1763
1764                 if (new_conf->two_primaries != old_conf->two_primaries)
1765                         return ERR_NEED_APV_100;
1766
1767                 if (!new_conf->integrity_alg != !old_conf->integrity_alg)
1768                         return ERR_NEED_APV_100;
1769
1770                 if (strcmp(new_conf->integrity_alg, old_conf->integrity_alg))
1771                         return ERR_NEED_APV_100;
1772         }
1773
1774         if (!new_conf->two_primaries &&
1775             conn_highest_role(tconn) == R_PRIMARY &&
1776             conn_highest_peer(tconn) == R_PRIMARY)
1777                 return ERR_NEED_ALLOW_TWO_PRI;
1778
1779         if (new_conf->two_primaries &&
1780             (new_conf->wire_protocol != DRBD_PROT_C))
1781                 return ERR_NOT_PROTO_C;
1782
1783         idr_for_each_entry(&tconn->volumes, mdev, i) {
1784                 if (get_ldev(mdev)) {
1785                         enum drbd_fencing_p fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
1786                         put_ldev(mdev);
1787                         if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
1788                                 return ERR_STONITH_AND_PROT_A;
1789                 }
1790                 if (mdev->state.role == R_PRIMARY && new_conf->discard_my_data)
1791                         return ERR_DISCARD;
1792         }
1793
1794         if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A)
1795                 return ERR_CONG_NOT_PROTO_A;
1796
1797         return NO_ERROR;
1798 }
1799
1800 static enum drbd_ret_code
1801 check_net_options(struct drbd_tconn *tconn, struct net_conf *new_conf)
1802 {
1803         static enum drbd_ret_code rv;
1804         struct drbd_conf *mdev;
1805         int i;
1806
1807         rcu_read_lock();
1808         rv = _check_net_options(tconn, rcu_dereference(tconn->net_conf), new_conf);
1809         rcu_read_unlock();
1810
1811         /* tconn->volumes protected by genl_lock() here */
1812         idr_for_each_entry(&tconn->volumes, mdev, i) {
1813                 if (!mdev->bitmap) {
1814                         if(drbd_bm_init(mdev))
1815                                 return ERR_NOMEM;
1816                 }
1817         }
1818
1819         return rv;
1820 }
1821
1822 struct crypto {
1823         struct crypto_hash *verify_tfm;
1824         struct crypto_hash *csums_tfm;
1825         struct crypto_hash *cram_hmac_tfm;
1826         struct crypto_hash *integrity_tfm;
1827 };
1828
1829 static int
1830 alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
1831 {
1832         if (!tfm_name[0])
1833                 return NO_ERROR;
1834
1835         *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
1836         if (IS_ERR(*tfm)) {
1837                 *tfm = NULL;
1838                 return err_alg;
1839         }
1840
1841         return NO_ERROR;
1842 }
1843
1844 static enum drbd_ret_code
1845 alloc_crypto(struct crypto *crypto, struct net_conf *new_conf)
1846 {
1847         char hmac_name[CRYPTO_MAX_ALG_NAME];
1848         enum drbd_ret_code rv;
1849
1850         rv = alloc_hash(&crypto->csums_tfm, new_conf->csums_alg,
1851                        ERR_CSUMS_ALG);
1852         if (rv != NO_ERROR)
1853                 return rv;
1854         rv = alloc_hash(&crypto->verify_tfm, new_conf->verify_alg,
1855                        ERR_VERIFY_ALG);
1856         if (rv != NO_ERROR)
1857                 return rv;
1858         rv = alloc_hash(&crypto->integrity_tfm, new_conf->integrity_alg,
1859                        ERR_INTEGRITY_ALG);
1860         if (rv != NO_ERROR)
1861                 return rv;
1862         if (new_conf->cram_hmac_alg[0] != 0) {
1863                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1864                          new_conf->cram_hmac_alg);
1865
1866                 rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
1867                                ERR_AUTH_ALG);
1868         }
1869
1870         return rv;
1871 }
1872
1873 static void free_crypto(struct crypto *crypto)
1874 {
1875         crypto_free_hash(crypto->cram_hmac_tfm);
1876         crypto_free_hash(crypto->integrity_tfm);
1877         crypto_free_hash(crypto->csums_tfm);
1878         crypto_free_hash(crypto->verify_tfm);
1879 }
1880
1881 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
1882 {
1883         enum drbd_ret_code retcode;
1884         struct drbd_tconn *tconn;
1885         struct net_conf *old_conf, *new_conf = NULL;
1886         int err;
1887         int ovr; /* online verify running */
1888         int rsr; /* re-sync running */
1889         struct crypto crypto = { };
1890
1891         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
1892         if (!adm_ctx.reply_skb)
1893                 return retcode;
1894         if (retcode != NO_ERROR)
1895                 goto out;
1896
1897         tconn = adm_ctx.tconn;
1898
1899         new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1900         if (!new_conf) {
1901                 retcode = ERR_NOMEM;
1902                 goto out;
1903         }
1904
1905         conn_reconfig_start(tconn);
1906
1907         mutex_lock(&tconn->data.mutex);
1908         mutex_lock(&tconn->conf_update);
1909         old_conf = tconn->net_conf;
1910
1911         if (!old_conf) {
1912                 drbd_msg_put_info("net conf missing, try connect");
1913                 retcode = ERR_INVALID_REQUEST;
1914                 goto fail;
1915         }
1916
1917         *new_conf = *old_conf;
1918         if (should_set_defaults(info))
1919                 set_net_conf_defaults(new_conf);
1920
1921         err = net_conf_from_attrs_for_change(new_conf, info);
1922         if (err && err != -ENOMSG) {
1923                 retcode = ERR_MANDATORY_TAG;
1924                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1925                 goto fail;
1926         }
1927
1928         retcode = check_net_options(tconn, new_conf);
1929         if (retcode != NO_ERROR)
1930                 goto fail;
1931
1932         /* re-sync running */
1933         rsr = conn_resync_running(tconn);
1934         if (rsr && strcmp(new_conf->csums_alg, old_conf->csums_alg)) {
1935                 retcode = ERR_CSUMS_RESYNC_RUNNING;
1936                 goto fail;
1937         }
1938
1939         /* online verify running */
1940         ovr = conn_ov_running(tconn);
1941         if (ovr && strcmp(new_conf->verify_alg, old_conf->verify_alg)) {
1942                 retcode = ERR_VERIFY_RUNNING;
1943                 goto fail;
1944         }
1945
1946         retcode = alloc_crypto(&crypto, new_conf);
1947         if (retcode != NO_ERROR)
1948                 goto fail;
1949
1950         rcu_assign_pointer(tconn->net_conf, new_conf);
1951
1952         if (!rsr) {
1953                 crypto_free_hash(tconn->csums_tfm);
1954                 tconn->csums_tfm = crypto.csums_tfm;
1955                 crypto.csums_tfm = NULL;
1956         }
1957         if (!ovr) {
1958                 crypto_free_hash(tconn->verify_tfm);
1959                 tconn->verify_tfm = crypto.verify_tfm;
1960                 crypto.verify_tfm = NULL;
1961         }
1962
1963         crypto_free_hash(tconn->integrity_tfm);
1964         tconn->integrity_tfm = crypto.integrity_tfm;
1965         if (tconn->cstate >= C_WF_REPORT_PARAMS && tconn->agreed_pro_version >= 100)
1966                 /* Do this without trying to take tconn->data.mutex again.  */
1967                 __drbd_send_protocol(tconn, P_PROTOCOL_UPDATE);
1968
1969         crypto_free_hash(tconn->cram_hmac_tfm);
1970         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
1971
1972         mutex_unlock(&tconn->conf_update);
1973         mutex_unlock(&tconn->data.mutex);
1974         synchronize_rcu();
1975         kfree(old_conf);
1976
1977         if (tconn->cstate >= C_WF_REPORT_PARAMS)
1978                 drbd_send_sync_param(minor_to_mdev(conn_lowest_minor(tconn)));
1979
1980         goto done;
1981
1982  fail:
1983         mutex_unlock(&tconn->conf_update);
1984         mutex_unlock(&tconn->data.mutex);
1985         free_crypto(&crypto);
1986         kfree(new_conf);
1987  done:
1988         conn_reconfig_done(tconn);
1989  out:
1990         drbd_adm_finish(info, retcode);
1991         return 0;
1992 }
1993
1994 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
1995 {
1996         struct drbd_conf *mdev;
1997         struct net_conf *old_conf, *new_conf = NULL;
1998         struct crypto crypto = { };
1999         struct drbd_tconn *tconn;
2000         enum drbd_ret_code retcode;
2001         int i;
2002         int err;
2003
2004         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2005
2006         if (!adm_ctx.reply_skb)
2007                 return retcode;
2008         if (retcode != NO_ERROR)
2009                 goto out;
2010         if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
2011                 drbd_msg_put_info("connection endpoint(s) missing");
2012                 retcode = ERR_INVALID_REQUEST;
2013                 goto out;
2014         }
2015
2016         /* No need for _rcu here. All reconfiguration is
2017          * strictly serialized on genl_lock(). We are protected against
2018          * concurrent reconfiguration/addition/deletion */
2019         list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
2020                 if (nla_len(adm_ctx.my_addr) == tconn->my_addr_len &&
2021                     !memcmp(nla_data(adm_ctx.my_addr), &tconn->my_addr, tconn->my_addr_len)) {
2022                         retcode = ERR_LOCAL_ADDR;
2023                         goto out;
2024                 }
2025
2026                 if (nla_len(adm_ctx.peer_addr) == tconn->peer_addr_len &&
2027                     !memcmp(nla_data(adm_ctx.peer_addr), &tconn->peer_addr, tconn->peer_addr_len)) {
2028                         retcode = ERR_PEER_ADDR;
2029                         goto out;
2030                 }
2031         }
2032
2033         tconn = adm_ctx.tconn;
2034         conn_reconfig_start(tconn);
2035
2036         if (tconn->cstate > C_STANDALONE) {
2037                 retcode = ERR_NET_CONFIGURED;
2038                 goto fail;
2039         }
2040
2041         /* allocation not in the IO path, cqueue thread context */
2042         new_conf = kzalloc(sizeof(*new_conf), GFP_KERNEL);
2043         if (!new_conf) {
2044                 retcode = ERR_NOMEM;
2045                 goto fail;
2046         }
2047
2048         set_net_conf_defaults(new_conf);
2049
2050         err = net_conf_from_attrs(new_conf, info);
2051         if (err) {
2052                 retcode = ERR_MANDATORY_TAG;
2053                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2054                 goto fail;
2055         }
2056
2057         retcode = check_net_options(tconn, new_conf);
2058         if (retcode != NO_ERROR)
2059                 goto fail;
2060
2061         retcode = alloc_crypto(&crypto, new_conf);
2062         if (retcode != NO_ERROR)
2063                 goto fail;
2064
2065         ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2066
2067         conn_flush_workqueue(tconn);
2068
2069         mutex_lock(&tconn->conf_update);
2070         old_conf = tconn->net_conf;
2071         if (old_conf) {
2072                 retcode = ERR_NET_CONFIGURED;
2073                 mutex_unlock(&tconn->conf_update);
2074                 goto fail;
2075         }
2076         rcu_assign_pointer(tconn->net_conf, new_conf);
2077
2078         conn_free_crypto(tconn);
2079         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2080         tconn->integrity_tfm = crypto.integrity_tfm;
2081         tconn->csums_tfm = crypto.csums_tfm;
2082         tconn->verify_tfm = crypto.verify_tfm;
2083
2084         tconn->my_addr_len = nla_len(adm_ctx.my_addr);
2085         memcpy(&tconn->my_addr, nla_data(adm_ctx.my_addr), tconn->my_addr_len);
2086         tconn->peer_addr_len = nla_len(adm_ctx.peer_addr);
2087         memcpy(&tconn->peer_addr, nla_data(adm_ctx.peer_addr), tconn->peer_addr_len);
2088
2089         mutex_unlock(&tconn->conf_update);
2090
2091         rcu_read_lock();
2092         idr_for_each_entry(&tconn->volumes, mdev, i) {
2093                 mdev->send_cnt = 0;
2094                 mdev->recv_cnt = 0;
2095         }
2096         rcu_read_unlock();
2097
2098         retcode = conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2099
2100         conn_reconfig_done(tconn);
2101         drbd_adm_finish(info, retcode);
2102         return 0;
2103
2104 fail:
2105         free_crypto(&crypto);
2106         kfree(new_conf);
2107
2108         conn_reconfig_done(tconn);
2109 out:
2110         drbd_adm_finish(info, retcode);
2111         return 0;
2112 }
2113
2114 static enum drbd_state_rv conn_try_disconnect(struct drbd_tconn *tconn, bool force)
2115 {
2116         enum drbd_state_rv rv;
2117
2118         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2119                         force ? CS_HARD : 0);
2120
2121         switch (rv) {
2122         case SS_NOTHING_TO_DO:
2123                 break;
2124         case SS_ALREADY_STANDALONE:
2125                 return SS_SUCCESS;
2126         case SS_PRIMARY_NOP:
2127                 /* Our state checking code wants to see the peer outdated. */
2128                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2129                                                 pdsk, D_OUTDATED), CS_VERBOSE);
2130                 break;
2131         case SS_CW_FAILED_BY_PEER:
2132                 /* The peer probably wants to see us outdated. */
2133                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2134                                                         disk, D_OUTDATED), 0);
2135                 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2136                         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2137                                         CS_HARD);
2138                 }
2139                 break;
2140         default:;
2141                 /* no special handling necessary */
2142         }
2143
2144         if (rv >= SS_SUCCESS) {
2145                 enum drbd_state_rv rv2;
2146                 /* No one else can reconfigure the network while I am here.
2147                  * The state handling only uses drbd_thread_stop_nowait(),
2148                  * we want to really wait here until the receiver is no more.
2149                  */
2150                 drbd_thread_stop(&adm_ctx.tconn->receiver);
2151
2152                 /* Race breaker.  This additional state change request may be
2153                  * necessary, if this was a forced disconnect during a receiver
2154                  * restart.  We may have "killed" the receiver thread just
2155                  * after drbdd_init() returned.  Typically, we should be
2156                  * C_STANDALONE already, now, and this becomes a no-op.
2157                  */
2158                 rv2 = conn_request_state(tconn, NS(conn, C_STANDALONE),
2159                                 CS_VERBOSE | CS_HARD);
2160                 if (rv2 < SS_SUCCESS)
2161                         conn_err(tconn,
2162                                 "unexpected rv2=%d in conn_try_disconnect()\n",
2163                                 rv2);
2164         }
2165         return rv;
2166 }
2167
2168 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2169 {
2170         struct disconnect_parms parms;
2171         struct drbd_tconn *tconn;
2172         enum drbd_state_rv rv;
2173         enum drbd_ret_code retcode;
2174         int err;
2175
2176         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
2177         if (!adm_ctx.reply_skb)
2178                 return retcode;
2179         if (retcode != NO_ERROR)
2180                 goto fail;
2181
2182         tconn = adm_ctx.tconn;
2183         memset(&parms, 0, sizeof(parms));
2184         if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2185                 err = disconnect_parms_from_attrs(&parms, info);
2186                 if (err) {
2187                         retcode = ERR_MANDATORY_TAG;
2188                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2189                         goto fail;
2190                 }
2191         }
2192
2193         rv = conn_try_disconnect(tconn, parms.force_disconnect);
2194         if (rv < SS_SUCCESS)
2195                 retcode = rv;  /* FIXME: Type mismatch. */
2196         else
2197                 retcode = NO_ERROR;
2198  fail:
2199         drbd_adm_finish(info, retcode);
2200         return 0;
2201 }
2202
2203 void resync_after_online_grow(struct drbd_conf *mdev)
2204 {
2205         int iass; /* I am sync source */
2206
2207         dev_info(DEV, "Resync of new storage after online grow\n");
2208         if (mdev->state.role != mdev->state.peer)
2209                 iass = (mdev->state.role == R_PRIMARY);
2210         else
2211                 iass = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags);
2212
2213         if (iass)
2214                 drbd_start_resync(mdev, C_SYNC_SOURCE);
2215         else
2216                 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2217 }
2218
2219 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2220 {
2221         struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
2222         struct resize_parms rs;
2223         struct drbd_conf *mdev;
2224         enum drbd_ret_code retcode;
2225         enum determine_dev_size dd;
2226         enum dds_flags ddsf;
2227         sector_t u_size;
2228         int err;
2229
2230         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2231         if (!adm_ctx.reply_skb)
2232                 return retcode;
2233         if (retcode != NO_ERROR)
2234                 goto fail;
2235
2236         memset(&rs, 0, sizeof(struct resize_parms));
2237         if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2238                 err = resize_parms_from_attrs(&rs, info);
2239                 if (err) {
2240                         retcode = ERR_MANDATORY_TAG;
2241                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2242                         goto fail;
2243                 }
2244         }
2245
2246         mdev = adm_ctx.mdev;
2247         if (mdev->state.conn > C_CONNECTED) {
2248                 retcode = ERR_RESIZE_RESYNC;
2249                 goto fail;
2250         }
2251
2252         if (mdev->state.role == R_SECONDARY &&
2253             mdev->state.peer == R_SECONDARY) {
2254                 retcode = ERR_NO_PRIMARY;
2255                 goto fail;
2256         }
2257
2258         if (!get_ldev(mdev)) {
2259                 retcode = ERR_NO_DISK;
2260                 goto fail;
2261         }
2262
2263         if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
2264                 retcode = ERR_NEED_APV_93;
2265                 goto fail;
2266         }
2267
2268         rcu_read_lock();
2269         u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
2270         rcu_read_unlock();
2271         if (u_size != (sector_t)rs.resize_size) {
2272                 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2273                 if (!new_disk_conf) {
2274                         retcode = ERR_NOMEM;
2275                         goto fail;
2276                 }
2277         }
2278
2279         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
2280                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
2281
2282         if (new_disk_conf) {
2283                 mutex_lock(&mdev->tconn->conf_update);
2284                 old_disk_conf = mdev->ldev->disk_conf;
2285                 *new_disk_conf = *old_disk_conf;
2286                 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2287                 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
2288                 mutex_unlock(&mdev->tconn->conf_update);
2289                 synchronize_rcu();
2290                 kfree(old_disk_conf);
2291         }
2292
2293         ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2294         dd = drbd_determine_dev_size(mdev, ddsf);
2295         drbd_md_sync(mdev);
2296         put_ldev(mdev);
2297         if (dd == dev_size_error) {
2298                 retcode = ERR_NOMEM_BITMAP;
2299                 goto fail;
2300         }
2301
2302         if (mdev->state.conn == C_CONNECTED) {
2303                 if (dd == grew)
2304                         set_bit(RESIZE_PENDING, &mdev->flags);
2305
2306                 drbd_send_uuids(mdev);
2307                 drbd_send_sizes(mdev, 1, ddsf);
2308         }
2309
2310  fail:
2311         drbd_adm_finish(info, retcode);
2312         return 0;
2313 }
2314
2315 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2316 {
2317         enum drbd_ret_code retcode;
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_RESOURCE);
2323         if (!adm_ctx.reply_skb)
2324                 return retcode;
2325         if (retcode != NO_ERROR)
2326                 goto fail;
2327         tconn = adm_ctx.tconn;
2328
2329         res_opts = tconn->res_opts;
2330         if (should_set_defaults(info))
2331                 set_res_opts_defaults(&res_opts);
2332
2333         err = res_opts_from_attrs(&res_opts, info);
2334         if (err && err != -ENOMSG) {
2335                 retcode = ERR_MANDATORY_TAG;
2336                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2337                 goto fail;
2338         }
2339
2340         err = set_resource_options(tconn, &res_opts);
2341         if (err) {
2342                 retcode = ERR_INVALID_REQUEST;
2343                 if (err == -ENOMEM)
2344                         retcode = ERR_NOMEM;
2345         }
2346
2347 fail:
2348         drbd_adm_finish(info, retcode);
2349         return 0;
2350 }
2351
2352 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2353 {
2354         struct drbd_conf *mdev;
2355         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2356
2357         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2358         if (!adm_ctx.reply_skb)
2359                 return retcode;
2360         if (retcode != NO_ERROR)
2361                 goto out;
2362
2363         mdev = adm_ctx.mdev;
2364
2365         /* If there is still bitmap IO pending, probably because of a previous
2366          * resync just being finished, wait for it before requesting a new resync. */
2367         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2368
2369         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
2370
2371         if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
2372                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2373
2374         while (retcode == SS_NEED_CONNECTION) {
2375                 spin_lock_irq(&mdev->tconn->req_lock);
2376                 if (mdev->state.conn < C_CONNECTED)
2377                         retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
2378                 spin_unlock_irq(&mdev->tconn->req_lock);
2379
2380                 if (retcode != SS_NEED_CONNECTION)
2381                         break;
2382
2383                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2384         }
2385
2386 out:
2387         drbd_adm_finish(info, retcode);
2388         return 0;
2389 }
2390
2391 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2392                 union drbd_state mask, union drbd_state val)
2393 {
2394         enum drbd_ret_code retcode;
2395
2396         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2397         if (!adm_ctx.reply_skb)
2398                 return retcode;
2399         if (retcode != NO_ERROR)
2400                 goto out;
2401
2402         retcode = drbd_request_state(adm_ctx.mdev, mask, val);
2403 out:
2404         drbd_adm_finish(info, retcode);
2405         return 0;
2406 }
2407
2408 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
2409 {
2410         return drbd_adm_simple_request_state(skb, info, NS(conn, C_STARTING_SYNC_S));
2411 }
2412
2413 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2414 {
2415         enum drbd_ret_code retcode;
2416
2417         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2418         if (!adm_ctx.reply_skb)
2419                 return retcode;
2420         if (retcode != NO_ERROR)
2421                 goto out;
2422
2423         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2424                 retcode = ERR_PAUSE_IS_SET;
2425 out:
2426         drbd_adm_finish(info, retcode);
2427         return 0;
2428 }
2429
2430 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
2431 {
2432         union drbd_dev_state s;
2433         enum drbd_ret_code retcode;
2434
2435         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2436         if (!adm_ctx.reply_skb)
2437                 return retcode;
2438         if (retcode != NO_ERROR)
2439                 goto out;
2440
2441         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2442                 s = adm_ctx.mdev->state;
2443                 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2444                         retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2445                                   s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2446                 } else {
2447                         retcode = ERR_PAUSE_IS_CLEAR;
2448                 }
2449         }
2450
2451 out:
2452         drbd_adm_finish(info, retcode);
2453         return 0;
2454 }
2455
2456 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
2457 {
2458         return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
2459 }
2460
2461 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
2462 {
2463         struct drbd_conf *mdev;
2464         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2465
2466         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2467         if (!adm_ctx.reply_skb)
2468                 return retcode;
2469         if (retcode != NO_ERROR)
2470                 goto out;
2471
2472         mdev = adm_ctx.mdev;
2473         if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2474                 drbd_uuid_new_current(mdev);
2475                 clear_bit(NEW_CUR_UUID, &mdev->flags);
2476         }
2477         drbd_suspend_io(mdev);
2478         retcode = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2479         if (retcode == SS_SUCCESS) {
2480                 if (mdev->state.conn < C_CONNECTED)
2481                         tl_clear(mdev->tconn);
2482                 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2483                         tl_restart(mdev->tconn, FAIL_FROZEN_DISK_IO);
2484         }
2485         drbd_resume_io(mdev);
2486
2487 out:
2488         drbd_adm_finish(info, retcode);
2489         return 0;
2490 }
2491
2492 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
2493 {
2494         return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
2495 }
2496
2497 int nla_put_drbd_cfg_context(struct sk_buff *skb, struct drbd_tconn *tconn, unsigned vnr)
2498 {
2499         struct nlattr *nla;
2500         nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2501         if (!nla)
2502                 goto nla_put_failure;
2503         if (vnr != VOLUME_UNSPECIFIED)
2504                 NLA_PUT_U32(skb, T_ctx_volume, vnr);
2505         NLA_PUT_STRING(skb, T_ctx_resource_name, tconn->name);
2506         if (tconn->my_addr_len)
2507                 NLA_PUT(skb, T_ctx_my_addr, tconn->my_addr_len, &tconn->my_addr);
2508         if (tconn->peer_addr_len)
2509                 NLA_PUT(skb, T_ctx_peer_addr, tconn->peer_addr_len, &tconn->peer_addr);
2510         nla_nest_end(skb, nla);
2511         return 0;
2512
2513 nla_put_failure:
2514         if (nla)
2515                 nla_nest_cancel(skb, nla);
2516         return -EMSGSIZE;
2517 }
2518
2519 int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
2520                 const struct sib_info *sib)
2521 {
2522         struct state_info *si = NULL; /* for sizeof(si->member); */
2523         struct net_conf *nc;
2524         struct nlattr *nla;
2525         int got_ldev;
2526         int err = 0;
2527         int exclude_sensitive;
2528
2529         /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2530          * to.  So we better exclude_sensitive information.
2531          *
2532          * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2533          * in the context of the requesting user process. Exclude sensitive
2534          * information, unless current has superuser.
2535          *
2536          * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2537          * relies on the current implementation of netlink_dump(), which
2538          * executes the dump callback successively from netlink_recvmsg(),
2539          * always in the context of the receiving process */
2540         exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2541
2542         got_ldev = get_ldev(mdev);
2543
2544         /* We need to add connection name and volume number information still.
2545          * Minor number is in drbd_genlmsghdr. */
2546         if (nla_put_drbd_cfg_context(skb, mdev->tconn, mdev->vnr))
2547                 goto nla_put_failure;
2548
2549         if (res_opts_to_skb(skb, &mdev->tconn->res_opts, exclude_sensitive))
2550                 goto nla_put_failure;
2551
2552         rcu_read_lock();
2553         if (got_ldev)
2554                 if (disk_conf_to_skb(skb, rcu_dereference(mdev->ldev->disk_conf), exclude_sensitive))
2555                         goto nla_put_failure;
2556
2557         nc = rcu_dereference(mdev->tconn->net_conf);
2558         if (nc)
2559                 err = net_conf_to_skb(skb, nc, exclude_sensitive);
2560         rcu_read_unlock();
2561         if (err)
2562                 goto nla_put_failure;
2563
2564         nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2565         if (!nla)
2566                 goto nla_put_failure;
2567         NLA_PUT_U32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY);
2568         NLA_PUT_U32(skb, T_current_state, mdev->state.i);
2569         NLA_PUT_U64(skb, T_ed_uuid, mdev->ed_uuid);
2570         NLA_PUT_U64(skb, T_capacity, drbd_get_capacity(mdev->this_bdev));
2571
2572         if (got_ldev) {
2573                 NLA_PUT_U32(skb, T_disk_flags, mdev->ldev->md.flags);
2574                 NLA_PUT(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid);
2575                 NLA_PUT_U64(skb, T_bits_total, drbd_bm_bits(mdev));
2576                 NLA_PUT_U64(skb, T_bits_oos, drbd_bm_total_weight(mdev));
2577                 if (C_SYNC_SOURCE <= mdev->state.conn &&
2578                     C_PAUSED_SYNC_T >= mdev->state.conn) {
2579                         NLA_PUT_U64(skb, T_bits_rs_total, mdev->rs_total);
2580                         NLA_PUT_U64(skb, T_bits_rs_failed, mdev->rs_failed);
2581                 }
2582         }
2583
2584         if (sib) {
2585                 switch(sib->sib_reason) {
2586                 case SIB_SYNC_PROGRESS:
2587                 case SIB_GET_STATUS_REPLY:
2588                         break;
2589                 case SIB_STATE_CHANGE:
2590                         NLA_PUT_U32(skb, T_prev_state, sib->os.i);
2591                         NLA_PUT_U32(skb, T_new_state, sib->ns.i);
2592                         break;
2593                 case SIB_HELPER_POST:
2594                         NLA_PUT_U32(skb,
2595                                 T_helper_exit_code, sib->helper_exit_code);
2596                         /* fall through */
2597                 case SIB_HELPER_PRE:
2598                         NLA_PUT_STRING(skb, T_helper, sib->helper_name);
2599                         break;
2600                 }
2601         }
2602         nla_nest_end(skb, nla);
2603
2604         if (0)
2605 nla_put_failure:
2606                 err = -EMSGSIZE;
2607         if (got_ldev)
2608                 put_ldev(mdev);
2609         return err;
2610 }
2611
2612 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
2613 {
2614         enum drbd_ret_code retcode;
2615         int err;
2616
2617         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2618         if (!adm_ctx.reply_skb)
2619                 return retcode;
2620         if (retcode != NO_ERROR)
2621                 goto out;
2622
2623         err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.mdev, NULL);
2624         if (err) {
2625                 nlmsg_free(adm_ctx.reply_skb);
2626                 return err;
2627         }
2628 out:
2629         drbd_adm_finish(info, retcode);
2630         return 0;
2631 }
2632
2633 int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
2634 {
2635         struct drbd_conf *mdev;
2636         struct drbd_genlmsghdr *dh;
2637         struct drbd_tconn *pos = (struct drbd_tconn*)cb->args[0];
2638         struct drbd_tconn *tconn = NULL;
2639         struct drbd_tconn *tmp;
2640         unsigned volume = cb->args[1];
2641
2642         /* Open coded, deferred, iteration:
2643          * list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
2644          *      idr_for_each_entry(&tconn->volumes, mdev, i) {
2645          *        ...
2646          *      }
2647          * }
2648          * where tconn is cb->args[0];
2649          * and i is cb->args[1];
2650          *
2651          * cb->args[2] indicates if we shall loop over all resources,
2652          * or just dump all volumes of a single resource.
2653          *
2654          * This may miss entries inserted after this dump started,
2655          * or entries deleted before they are reached.
2656          *
2657          * We need to make sure the mdev won't disappear while
2658          * we are looking at it, and revalidate our iterators
2659          * on each iteration.
2660          */
2661
2662         /* synchronize with conn_create()/conn_destroy() */
2663         rcu_read_lock();
2664         /* revalidate iterator position */
2665         list_for_each_entry_rcu(tmp, &drbd_tconns, all_tconn) {
2666                 if (pos == NULL) {
2667                         /* first iteration */
2668                         pos = tmp;
2669                         tconn = pos;
2670                         break;
2671                 }
2672                 if (tmp == pos) {
2673                         tconn = pos;
2674                         break;
2675                 }
2676         }
2677         if (tconn) {
2678 next_tconn:
2679                 mdev = idr_get_next(&tconn->volumes, &volume);
2680                 if (!mdev) {
2681                         /* No more volumes to dump on this tconn.
2682                          * Advance tconn iterator. */
2683                         pos = list_entry_rcu(tconn->all_tconn.next,
2684                                              struct drbd_tconn, all_tconn);
2685                         /* Did we dump any volume on this tconn yet? */
2686                         if (volume != 0) {
2687                                 /* If we reached the end of the list,
2688                                  * or only a single resource dump was requested,
2689                                  * we are done. */
2690                                 if (&pos->all_tconn == &drbd_tconns || cb->args[2])
2691                                         goto out;
2692                                 volume = 0;
2693                                 tconn = pos;
2694                                 goto next_tconn;
2695                         }
2696                 }
2697
2698                 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).pid,
2699                                 cb->nlh->nlmsg_seq, &drbd_genl_family,
2700                                 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
2701                 if (!dh)
2702                         goto out;
2703
2704                 if (!mdev) {
2705                         /* This is a tconn without a single volume.
2706                          * Suprisingly enough, it may have a network
2707                          * configuration. */
2708                         struct net_conf *nc;
2709                         dh->minor = -1U;
2710                         dh->ret_code = NO_ERROR;
2711                         if (nla_put_drbd_cfg_context(skb, tconn, VOLUME_UNSPECIFIED))
2712                                 goto cancel;
2713                         nc = rcu_dereference(tconn->net_conf);
2714                         if (nc && net_conf_to_skb(skb, nc, 1) != 0)
2715                                 goto cancel;
2716                         goto done;
2717                 }
2718
2719                 D_ASSERT(mdev->vnr == volume);
2720                 D_ASSERT(mdev->tconn == tconn);
2721
2722                 dh->minor = mdev_to_minor(mdev);
2723                 dh->ret_code = NO_ERROR;
2724
2725                 if (nla_put_status_info(skb, mdev, NULL)) {
2726 cancel:
2727                         genlmsg_cancel(skb, dh);
2728                         goto out;
2729                 }
2730 done:
2731                 genlmsg_end(skb, dh);
2732         }
2733
2734 out:
2735         rcu_read_unlock();
2736         /* where to start the next iteration */
2737         cb->args[0] = (long)pos;
2738         cb->args[1] = (pos == tconn) ? volume + 1 : 0;
2739
2740         /* No more tconns/volumes/minors found results in an empty skb.
2741          * Which will terminate the dump. */
2742         return skb->len;
2743 }
2744
2745 /*
2746  * Request status of all resources, or of all volumes within a single resource.
2747  *
2748  * This is a dump, as the answer may not fit in a single reply skb otherwise.
2749  * Which means we cannot use the family->attrbuf or other such members, because
2750  * dump is NOT protected by the genl_lock().  During dump, we only have access
2751  * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
2752  *
2753  * Once things are setup properly, we call into get_one_status().
2754  */
2755 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
2756 {
2757         const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
2758         struct nlattr *nla;
2759         const char *resource_name;
2760         struct drbd_tconn *tconn;
2761         int maxtype;
2762
2763         /* Is this a followup call? */
2764         if (cb->args[0]) {
2765                 /* ... of a single resource dump,
2766                  * and the resource iterator has been advanced already? */
2767                 if (cb->args[2] && cb->args[2] != cb->args[0])
2768                         return 0; /* DONE. */
2769                 goto dump;
2770         }
2771
2772         /* First call (from netlink_dump_start).  We need to figure out
2773          * which resource(s) the user wants us to dump. */
2774         nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
2775                         nlmsg_attrlen(cb->nlh, hdrlen),
2776                         DRBD_NLA_CFG_CONTEXT);
2777
2778         /* No explicit context given.  Dump all. */
2779         if (!nla)
2780                 goto dump;
2781         maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
2782         nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
2783         if (IS_ERR(nla))
2784                 return PTR_ERR(nla);
2785         /* context given, but no name present? */
2786         if (!nla)
2787                 return -EINVAL;
2788         resource_name = nla_data(nla);
2789         tconn = conn_get_by_name(resource_name);
2790
2791         if (!tconn)
2792                 return -ENODEV;
2793
2794         kref_put(&tconn->kref, &conn_destroy); /* get_one_status() (re)validates tconn by itself */
2795
2796         /* prime iterators, and set "filter" mode mark:
2797          * only dump this tconn. */
2798         cb->args[0] = (long)tconn;
2799         /* cb->args[1] = 0; passed in this way. */
2800         cb->args[2] = (long)tconn;
2801
2802 dump:
2803         return get_one_status(skb, cb);
2804 }
2805
2806 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
2807 {
2808         enum drbd_ret_code retcode;
2809         struct timeout_parms tp;
2810         int err;
2811
2812         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2813         if (!adm_ctx.reply_skb)
2814                 return retcode;
2815         if (retcode != NO_ERROR)
2816                 goto out;
2817
2818         tp.timeout_type =
2819                 adm_ctx.mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2820                 test_bit(USE_DEGR_WFC_T, &adm_ctx.mdev->flags) ? UT_DEGRADED :
2821                 UT_DEFAULT;
2822
2823         err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
2824         if (err) {
2825                 nlmsg_free(adm_ctx.reply_skb);
2826                 return err;
2827         }
2828 out:
2829         drbd_adm_finish(info, retcode);
2830         return 0;
2831 }
2832
2833 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
2834 {
2835         struct drbd_conf *mdev;
2836         enum drbd_ret_code retcode;
2837
2838         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2839         if (!adm_ctx.reply_skb)
2840                 return retcode;
2841         if (retcode != NO_ERROR)
2842                 goto out;
2843
2844         mdev = adm_ctx.mdev;
2845         if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
2846                 /* resume from last known position, if possible */
2847                 struct start_ov_parms parms =
2848                         { .ov_start_sector = mdev->ov_start_sector };
2849                 int err = start_ov_parms_from_attrs(&parms, info);
2850                 if (err) {
2851                         retcode = ERR_MANDATORY_TAG;
2852                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2853                         goto out;
2854                 }
2855                 /* w_make_ov_request expects position to be aligned */
2856                 mdev->ov_start_sector = parms.ov_start_sector & ~BM_SECT_PER_BIT;
2857         }
2858         /* If there is still bitmap IO pending, e.g. previous resync or verify
2859          * just being finished, wait for it before requesting a new resync. */
2860         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2861         retcode = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2862 out:
2863         drbd_adm_finish(info, retcode);
2864         return 0;
2865 }
2866
2867
2868 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
2869 {
2870         struct drbd_conf *mdev;
2871         enum drbd_ret_code retcode;
2872         int skip_initial_sync = 0;
2873         int err;
2874         struct new_c_uuid_parms args;
2875
2876         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2877         if (!adm_ctx.reply_skb)
2878                 return retcode;
2879         if (retcode != NO_ERROR)
2880                 goto out_nolock;
2881
2882         mdev = adm_ctx.mdev;
2883         memset(&args, 0, sizeof(args));
2884         if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
2885                 err = new_c_uuid_parms_from_attrs(&args, info);
2886                 if (err) {
2887                         retcode = ERR_MANDATORY_TAG;
2888                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2889                         goto out_nolock;
2890                 }
2891         }
2892
2893         mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
2894
2895         if (!get_ldev(mdev)) {
2896                 retcode = ERR_NO_DISK;
2897                 goto out;
2898         }
2899
2900         /* this is "skip initial sync", assume to be clean */
2901         if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
2902             mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2903                 dev_info(DEV, "Preparing to skip initial sync\n");
2904                 skip_initial_sync = 1;
2905         } else if (mdev->state.conn != C_STANDALONE) {
2906                 retcode = ERR_CONNECTED;
2907                 goto out_dec;
2908         }
2909
2910         drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2911         drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2912
2913         if (args.clear_bm) {
2914                 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
2915                         "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
2916                 if (err) {
2917                         dev_err(DEV, "Writing bitmap failed with %d\n",err);
2918                         retcode = ERR_IO_MD_DISK;
2919                 }
2920                 if (skip_initial_sync) {
2921                         drbd_send_uuids_skip_initial_sync(mdev);
2922                         _drbd_uuid_set(mdev, UI_BITMAP, 0);
2923                         drbd_print_uuids(mdev, "cleared bitmap UUID");
2924                         spin_lock_irq(&mdev->tconn->req_lock);
2925                         _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2926                                         CS_VERBOSE, NULL);
2927                         spin_unlock_irq(&mdev->tconn->req_lock);
2928                 }
2929         }
2930
2931         drbd_md_sync(mdev);
2932 out_dec:
2933         put_ldev(mdev);
2934 out:
2935         mutex_unlock(mdev->state_mutex);
2936 out_nolock:
2937         drbd_adm_finish(info, retcode);
2938         return 0;
2939 }
2940
2941 static enum drbd_ret_code
2942 drbd_check_resource_name(const char *name)
2943 {
2944         if (!name || !name[0]) {
2945                 drbd_msg_put_info("resource name missing");
2946                 return ERR_MANDATORY_TAG;
2947         }
2948         /* if we want to use these in sysfs/configfs/debugfs some day,
2949          * we must not allow slashes */
2950         if (strchr(name, '/')) {
2951                 drbd_msg_put_info("invalid resource name");
2952                 return ERR_INVALID_REQUEST;
2953         }
2954         return NO_ERROR;
2955 }
2956
2957 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
2958 {
2959         enum drbd_ret_code retcode;
2960         struct res_opts res_opts;
2961         int err;
2962
2963         retcode = drbd_adm_prepare(skb, info, 0);
2964         if (!adm_ctx.reply_skb)
2965                 return retcode;
2966         if (retcode != NO_ERROR)
2967                 goto out;
2968
2969         set_res_opts_defaults(&res_opts);
2970         err = res_opts_from_attrs(&res_opts, info);
2971         if (err && err != -ENOMSG) {
2972                 retcode = ERR_MANDATORY_TAG;
2973                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2974                 goto out;
2975         }
2976
2977         retcode = drbd_check_resource_name(adm_ctx.resource_name);
2978         if (retcode != NO_ERROR)
2979                 goto out;
2980
2981         if (adm_ctx.tconn) {
2982                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
2983                         retcode = ERR_INVALID_REQUEST;
2984                         drbd_msg_put_info("resource exists");
2985                 }
2986                 /* else: still NO_ERROR */
2987                 goto out;
2988         }
2989
2990         if (!conn_create(adm_ctx.resource_name, &res_opts))
2991                 retcode = ERR_NOMEM;
2992 out:
2993         drbd_adm_finish(info, retcode);
2994         return 0;
2995 }
2996
2997 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info)
2998 {
2999         struct drbd_genlmsghdr *dh = info->userhdr;
3000         enum drbd_ret_code retcode;
3001
3002         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3003         if (!adm_ctx.reply_skb)
3004                 return retcode;
3005         if (retcode != NO_ERROR)
3006                 goto out;
3007
3008         if (dh->minor > MINORMASK) {
3009                 drbd_msg_put_info("requested minor out of range");
3010                 retcode = ERR_INVALID_REQUEST;
3011                 goto out;
3012         }
3013         if (adm_ctx.volume > DRBD_VOLUME_MAX) {
3014                 drbd_msg_put_info("requested volume id out of range");
3015                 retcode = ERR_INVALID_REQUEST;
3016                 goto out;
3017         }
3018
3019         /* drbd_adm_prepare made sure already
3020          * that mdev->tconn and mdev->vnr match the request. */
3021         if (adm_ctx.mdev) {
3022                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3023                         retcode = ERR_MINOR_EXISTS;
3024                 /* else: still NO_ERROR */
3025                 goto out;
3026         }
3027
3028         retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume);
3029 out:
3030         drbd_adm_finish(info, retcode);
3031         return 0;
3032 }
3033
3034 static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
3035 {
3036         if (mdev->state.disk == D_DISKLESS &&
3037             /* no need to be mdev->state.conn == C_STANDALONE &&
3038              * we may want to delete a minor from a live replication group.
3039              */
3040             mdev->state.role == R_SECONDARY) {
3041                 _drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS),
3042                                     CS_VERBOSE + CS_WAIT_COMPLETE);
3043                 idr_remove(&mdev->tconn->volumes, mdev->vnr);
3044                 idr_remove(&minors, mdev_to_minor(mdev));
3045                 del_gendisk(mdev->vdisk);
3046                 synchronize_rcu();
3047                 kref_put(&mdev->kref, &drbd_minor_destroy);
3048                 return NO_ERROR;
3049         } else
3050                 return ERR_MINOR_CONFIGURED;
3051 }
3052
3053 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info)
3054 {
3055         enum drbd_ret_code retcode;
3056
3057         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3058         if (!adm_ctx.reply_skb)
3059                 return retcode;
3060         if (retcode != NO_ERROR)
3061                 goto out;
3062
3063         retcode = adm_delete_minor(adm_ctx.mdev);
3064 out:
3065         drbd_adm_finish(info, retcode);
3066         return 0;
3067 }
3068
3069 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3070 {
3071         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
3072         struct drbd_conf *mdev;
3073         unsigned i;
3074
3075         retcode = drbd_adm_prepare(skb, info, 0);
3076         if (!adm_ctx.reply_skb)
3077                 return retcode;
3078         if (retcode != NO_ERROR)
3079                 goto out;
3080
3081         if (!adm_ctx.tconn) {
3082                 retcode = ERR_RES_NOT_KNOWN;
3083                 goto out;
3084         }
3085
3086         /* demote */
3087         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3088                 retcode = drbd_set_role(mdev, R_SECONDARY, 0);
3089                 if (retcode < SS_SUCCESS) {
3090                         drbd_msg_put_info("failed to demote");
3091                         goto out;
3092                 }
3093         }
3094
3095         retcode = conn_try_disconnect(adm_ctx.tconn, 0);
3096         if (retcode < SS_SUCCESS) {
3097                 drbd_msg_put_info("failed to disconnect");
3098                 goto out;
3099         }
3100
3101         /* detach */
3102         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3103                 retcode = adm_detach(mdev, 0);
3104                 if (retcode < SS_SUCCESS) {
3105                         drbd_msg_put_info("failed to detach");
3106                         goto out;
3107                 }
3108         }
3109
3110         /* If we reach this, all volumes (of this tconn) are Secondary,
3111          * Disconnected, Diskless, aka Unconfigured. Make sure all threads have
3112          * actually stopped, state handling only does drbd_thread_stop_nowait(). */
3113         drbd_thread_stop(&adm_ctx.tconn->worker);
3114
3115         /* Now, nothing can fail anymore */
3116
3117         /* delete volumes */
3118         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3119                 retcode = adm_delete_minor(mdev);
3120                 if (retcode != NO_ERROR) {
3121                         /* "can not happen" */
3122                         drbd_msg_put_info("failed to delete volume");
3123                         goto out;
3124                 }
3125         }
3126
3127         /* delete connection */
3128         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3129                 list_del_rcu(&adm_ctx.tconn->all_tconn);
3130                 synchronize_rcu();
3131                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3132
3133                 retcode = NO_ERROR;
3134         } else {
3135                 /* "can not happen" */
3136                 retcode = ERR_RES_IN_USE;
3137                 drbd_msg_put_info("failed to delete connection");
3138         }
3139         goto out;
3140 out:
3141         drbd_adm_finish(info, retcode);
3142         return 0;
3143 }
3144
3145 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
3146 {
3147         enum drbd_ret_code retcode;
3148
3149         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3150         if (!adm_ctx.reply_skb)
3151                 return retcode;
3152         if (retcode != NO_ERROR)
3153                 goto out;
3154
3155         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3156                 list_del_rcu(&adm_ctx.tconn->all_tconn);
3157                 synchronize_rcu();
3158                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3159
3160                 retcode = NO_ERROR;
3161         } else {
3162                 retcode = ERR_RES_IN_USE;
3163         }
3164
3165         if (retcode == NO_ERROR)
3166                 drbd_thread_stop(&adm_ctx.tconn->worker);
3167 out:
3168         drbd_adm_finish(info, retcode);
3169         return 0;
3170 }
3171
3172 void drbd_bcast_event(struct drbd_conf *mdev, const struct sib_info *sib)
3173 {
3174         static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3175         struct sk_buff *msg;
3176         struct drbd_genlmsghdr *d_out;
3177         unsigned seq;
3178         int err = -ENOMEM;
3179
3180         seq = atomic_inc_return(&drbd_genl_seq);
3181         msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3182         if (!msg)
3183                 goto failed;
3184
3185         err = -EMSGSIZE;
3186         d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3187         if (!d_out) /* cannot happen, but anyways. */
3188                 goto nla_put_failure;
3189         d_out->minor = mdev_to_minor(mdev);
3190         d_out->ret_code = NO_ERROR;
3191
3192         if (nla_put_status_info(msg, mdev, sib))
3193                 goto nla_put_failure;
3194         genlmsg_end(msg, d_out);
3195         err = drbd_genl_multicast_events(msg, 0);
3196         /* msg has been consumed or freed in netlink_broadcast() */
3197         if (err && err != -ESRCH)
3198                 goto failed;
3199
3200         return;
3201
3202 nla_put_failure:
3203         nlmsg_free(msg);
3204 failed:
3205         dev_err(DEV, "Error %d while broadcasting event. "
3206                         "Event seq:%u sib_reason:%u\n",
3207                         err, seq, sib->sib_reason);
3208 }