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 drbd_tconn *tconn = mdev->tconn;
 327         struct sib_info sib;
 328         int ret;
 329
 330         if (current == tconn->worker.task)
 331                 set_bit(CALLBACK_PENDING, &tconn->flags);
 332
 333         snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
 334         setup_khelper_env(tconn, envp);
 335
 336         /* The helper may take some time.
 337          * write out any unsynced meta data changes now */
 338         drbd_md_sync(mdev);
 339
 340         dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
 341         sib.sib_reason = SIB_HELPER_PRE;
 342         sib.helper_name = cmd;
 343         drbd_bcast_event(mdev, &sib);
 344         ret = call_usermodehelper(usermode_helper, argv, envp, 1);
 345         if (ret)
 346                 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 347                                 usermode_helper, cmd, mb,
 348                                 (ret >> 8) & 0xff, ret);
 349         else
 350                 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 351                                 usermode_helper, cmd, mb,
 352                                 (ret >> 8) & 0xff, ret);
 353         sib.sib_reason = SIB_HELPER_POST;
 354         sib.helper_exit_code = ret;
 355         drbd_bcast_event(mdev, &sib);
 356
 357         if (current == tconn->worker.task)
 358                 clear_bit(CALLBACK_PENDING, &tconn->flags);
 359
 360         if (ret < 0) /* Ignore any ERRNOs we got. */
 361                 ret = 0;
 362
 363         return ret;
 364 }
 365
 366 static void conn_md_sync(struct drbd_tconn *tconn)
 367 {
 368         struct drbd_conf *mdev;
 369         int vnr;
 370
 371         rcu_read_lock();
 372         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
 373                 kref_get(&mdev->kref);
 374                 rcu_read_unlock();
 375                 drbd_md_sync(mdev);
 376                 kref_put(&mdev->kref, &drbd_minor_destroy);
 377                 rcu_read_lock();
 378         }
 379         rcu_read_unlock();
 380 }
 381
 382 int conn_khelper(struct drbd_tconn *tconn, char *cmd)
 383 {
 384         char *envp[] = { "HOME=/",
 385                         "TERM=linux",
 386                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 387                          (char[20]) { }, /* address family */
 388                          (char[60]) { }, /* address */
 389                         NULL };
 390         char *argv[] = {usermode_helper, cmd, tconn->name, NULL };
 391         int ret;
 392
 393         setup_khelper_env(tconn, envp);
 394         conn_md_sync(tconn);
 395
 396         conn_info(tconn, "helper command: %s %s %s\n", usermode_helper, cmd, tconn->name);
 397         /* TODO: conn_bcast_event() ?? */
 398
 399         ret = call_usermodehelper(usermode_helper, argv, envp, 1);
 400         if (ret)
 401                 conn_warn(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 402                           usermode_helper, cmd, tconn->name,
 403                           (ret >> 8) & 0xff, ret);
 404         else
 405                 conn_info(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 406                           usermode_helper, cmd, tconn->name,
 407                           (ret >> 8) & 0xff, ret);
 408         /* TODO: conn_bcast_event() ?? */
 409
 410         if (ret < 0) /* Ignore any ERRNOs we got. */
 411                 ret = 0;
 412
 413         return ret;
 414 }
 415
 416 static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
 417 {
 418         enum drbd_fencing_p fp = FP_NOT_AVAIL;
 419         struct drbd_conf *mdev;
 420         int vnr;
 421
 422         rcu_read_lock();
 423         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
 424                 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
 425                         fp = max_t(enum drbd_fencing_p, fp,
 426                                    rcu_dereference(mdev->ldev->disk_conf)->fencing);
 427                         put_ldev(mdev);
 428                 }
 429         }
 430         rcu_read_unlock();
 431
 432         return fp;
 433 }
 434
 435 bool conn_try_outdate_peer(struct drbd_tconn *tconn)
 436 {
 437         union drbd_state mask = { };
 438         union drbd_state val = { };
 439         enum drbd_fencing_p fp;
 440         char *ex_to_string;
 441         int r;
 442
 443         if (tconn->cstate >= C_WF_REPORT_PARAMS) {
 444                 conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");
 445                 return false;
 446         }
 447
 448         fp = highest_fencing_policy(tconn);
 449         switch (fp) {
 450         case FP_NOT_AVAIL:
 451                 conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");
 452                 goto out;
 453         case FP_DONT_CARE:
 454                 return true;
 455         default: ;
 456         }
 457
 458         r = conn_khelper(tconn, "fence-peer");
 459
 460         switch ((r>>8) & 0xff) {
 461         case 3: /* peer is inconsistent */
 462                 ex_to_string = "peer is inconsistent or worse";
 463                 mask.pdsk = D_MASK;
 464                 val.pdsk = D_INCONSISTENT;
 465                 break;
 466         case 4: /* peer got outdated, or was already outdated */
 467                 ex_to_string = "peer was fenced";
 468                 mask.pdsk = D_MASK;
 469                 val.pdsk = D_OUTDATED;
 470                 break;
 471         case 5: /* peer was down */
 472                 if (conn_highest_disk(tconn) == D_UP_TO_DATE) {
 473                         /* we will(have) create(d) a new UUID anyways... */
 474                         ex_to_string = "peer is unreachable, assumed to be dead";
 475                         mask.pdsk = D_MASK;
 476                         val.pdsk = D_OUTDATED;
 477                 } else {
 478                         ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
 479                 }
 480                 break;
 481         case 6: /* Peer is primary, voluntarily outdate myself.
 482                  * This is useful when an unconnected R_SECONDARY is asked to
 483                  * become R_PRIMARY, but finds the other peer being active. */
 484                 ex_to_string = "peer is active";
 485                 conn_warn(tconn, "Peer is primary, outdating myself.\n");
 486                 mask.disk = D_MASK;
 487                 val.disk = D_OUTDATED;
 488                 break;
 489         case 7:
 490                 if (fp != FP_STONITH)
 491                         conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");
 492                 ex_to_string = "peer was stonithed";
 493                 mask.pdsk = D_MASK;
 494                 val.pdsk = D_OUTDATED;
 495                 break;
 496         default:
 497                 /* The script is broken ... */
 498                 conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
 499                 return false; /* Eventually leave IO frozen */
 500         }
 501
 502         conn_info(tconn, "fence-peer helper returned %d (%s)\n",
 503                   (r>>8) & 0xff, ex_to_string);
 504
 505  out:
 506
 507         /* Not using
 508            conn_request_state(tconn, mask, val, CS_VERBOSE);
 509            here, because we might were able to re-establish the connection in the
 510            meantime. */
 511         spin_lock_irq(&tconn->req_lock);
 512         if (tconn->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &tconn->flags))
 513                 _conn_request_state(tconn, mask, val, CS_VERBOSE);
 514         spin_unlock_irq(&tconn->req_lock);
 515
 516         return conn_highest_pdsk(tconn) <= D_OUTDATED;
 517 }
 518
 519 static int _try_outdate_peer_async(void *data)
 520 {
 521         struct drbd_tconn *tconn = (struct drbd_tconn *)data;
 522
 523         conn_try_outdate_peer(tconn);
 524
 525         kref_put(&tconn->kref, &conn_destroy);
 526         return 0;
 527 }
 528
 529 void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
 530 {
 531         struct task_struct *opa;
 532
 533         kref_get(&tconn->kref);
 534         opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
 535         if (IS_ERR(opa)) {
 536                 conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
 537                 kref_put(&tconn->kref, &conn_destroy);
 538         }
 539 }
 540
 541 enum drbd_state_rv
 542 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
 543 {
 544         const int max_tries = 4;
 545         enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
 546         struct net_conf *nc;
 547         int try = 0;
 548         int forced = 0;
 549         union drbd_state mask, val;
 550
 551         if (new_role == R_PRIMARY)
 552                 request_ping(mdev->tconn); /* Detect a dead peer ASAP */
 553
 554         mutex_lock(mdev->state_mutex);
 555
 556         mask.i = 0; mask.role = R_MASK;
 557         val.i  = 0; val.role  = new_role;
 558
 559         while (try++ < max_tries) {
 560                 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
 561
 562                 /* in case we first succeeded to outdate,
 563                  * but now suddenly could establish a connection */
 564                 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
 565                         val.pdsk = 0;
 566                         mask.pdsk = 0;
 567                         continue;
 568                 }
 569
 570                 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
 571                     (mdev->state.disk < D_UP_TO_DATE &&
 572                      mdev->state.disk >= D_INCONSISTENT)) {
 573                         mask.disk = D_MASK;
 574                         val.disk  = D_UP_TO_DATE;
 575                         forced = 1;
 576                         continue;
 577                 }
 578
 579                 if (rv == SS_NO_UP_TO_DATE_DISK &&
 580                     mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
 581                         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 582
 583                         if (conn_try_outdate_peer(mdev->tconn)) {
 584                                 val.disk = D_UP_TO_DATE;
 585                                 mask.disk = D_MASK;
 586                         }
 587                         continue;
 588                 }
 589
 590                 if (rv == SS_NOTHING_TO_DO)
 591                         goto out;
 592                 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
 593                         if (!conn_try_outdate_peer(mdev->tconn) && force) {
 594                                 dev_warn(DEV, "Forced into split brain situation!\n");
 595                                 mask.pdsk = D_MASK;
 596                                 val.pdsk  = D_OUTDATED;
 597
 598                         }
 599                         continue;
 600                 }
 601                 if (rv == SS_TWO_PRIMARIES) {
 602                         /* Maybe the peer is detected as dead very soon...
 603                            retry at most once more in this case. */
 604                         int timeo;
 605                         rcu_read_lock();
 606                         nc = rcu_dereference(mdev->tconn->net_conf);
 607                         timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
 608                         rcu_read_unlock();
 609                         schedule_timeout_interruptible(timeo);
 610                         if (try < max_tries)
 611                                 try = max_tries - 1;
 612                         continue;
 613                 }
 614                 if (rv < SS_SUCCESS) {
 615                         rv = _drbd_request_state(mdev, mask, val,
 616                                                 CS_VERBOSE + CS_WAIT_COMPLETE);
 617                         if (rv < SS_SUCCESS)
 618                                 goto out;
 619                 }
 620                 break;
 621         }
 622
 623         if (rv < SS_SUCCESS)
 624                 goto out;
 625
 626         if (forced)
 627                 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
 628
 629         /* Wait until nothing is on the fly :) */
 630         wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
 631
 632         /* FIXME also wait for all pending P_BARRIER_ACK? */
 633
 634         if (new_role == R_SECONDARY) {
 635                 set_disk_ro(mdev->vdisk, true);
 636                 if (get_ldev(mdev)) {
 637                         mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
 638                         put_ldev(mdev);
 639                 }
 640         } else {
 641                 mutex_lock(&mdev->tconn->conf_update);
 642                 nc = mdev->tconn->net_conf;
 643                 if (nc)
 644                         nc->discard_my_data = 0; /* without copy; single bit op is atomic */
 645                 mutex_unlock(&mdev->tconn->conf_update);
 646
 647                 set_disk_ro(mdev->vdisk, false);
 648                 if (get_ldev(mdev)) {
 649                         if (((mdev->state.conn < C_CONNECTED ||
 650                                mdev->state.pdsk <= D_FAILED)
 651                               && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
 652                                 drbd_uuid_new_current(mdev);
 653
 654                         mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
 655                         put_ldev(mdev);
 656                 }
 657         }
 658
 659         /* writeout of activity log covered areas of the bitmap
 660          * to stable storage done in after state change already */
 661
 662         if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
 663                 /* if this was forced, we should consider sync */
 664                 if (forced)
 665                         drbd_send_uuids(mdev);
 666                 drbd_send_current_state(mdev);
 667         }
 668
 669         drbd_md_sync(mdev);
 670
 671         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
 672 out:
 673         mutex_unlock(mdev->state_mutex);
 674         return rv;
 675 }
 676
 677 static const char *from_attrs_err_to_txt(int err)
 678 {
 679         return  err == -ENOMSG ? "required attribute missing" :
 680                 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
 681                 err == -EEXIST ? "can not change invariant setting" :
 682                 "invalid attribute value";
 683 }
 684
 685 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
 686 {
 687         struct set_role_parms parms;
 688         int err;
 689         enum drbd_ret_code retcode;
 690
 691         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
 692         if (!adm_ctx.reply_skb)
 693                 return retcode;
 694         if (retcode != NO_ERROR)
 695                 goto out;
 696
 697         memset(&parms, 0, sizeof(parms));
 698         if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
 699                 err = set_role_parms_from_attrs(&parms, info);
 700                 if (err) {
 701                         retcode = ERR_MANDATORY_TAG;
 702                         drbd_msg_put_info(from_attrs_err_to_txt(err));
 703                         goto out;
 704                 }
 705         }
 706
 707         if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
 708                 retcode = drbd_set_role(adm_ctx.mdev, R_PRIMARY, parms.assume_uptodate);
 709         else
 710                 retcode = drbd_set_role(adm_ctx.mdev, R_SECONDARY, 0);
 711 out:
 712         drbd_adm_finish(info, retcode);
 713         return 0;
 714 }
 715
 716 /* initializes the md.*_offset members, so we are able to find
 717  * the on disk meta data */
 718 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
 719                                        struct drbd_backing_dev *bdev)
 720 {
 721         sector_t md_size_sect = 0;
 722         int meta_dev_idx;
 723
 724         rcu_read_lock();
 725         meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
 726
 727         switch (meta_dev_idx) {
 728         default:
 729                 /* v07 style fixed size indexed meta data */
 730                 bdev->md.md_size_sect = MD_RESERVED_SECT;
 731                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 732                 bdev->md.al_offset = MD_AL_OFFSET;
 733                 bdev->md.bm_offset = MD_BM_OFFSET;
 734                 break;
 735         case DRBD_MD_INDEX_FLEX_EXT:
 736                 /* just occupy the full device; unit: sectors */
 737                 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
 738                 bdev->md.md_offset = 0;
 739                 bdev->md.al_offset = MD_AL_OFFSET;
 740                 bdev->md.bm_offset = MD_BM_OFFSET;
 741                 break;
 742         case DRBD_MD_INDEX_INTERNAL:
 743         case DRBD_MD_INDEX_FLEX_INT:
 744                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 745                 /* al size is still fixed */
 746                 bdev->md.al_offset = -MD_AL_SECTORS;
 747                 /* we need (slightly less than) ~ this much bitmap sectors: */
 748                 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
 749                 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
 750                 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
 751                 md_size_sect = ALIGN(md_size_sect, 8);
 752
 753                 /* plus the "drbd meta data super block",
 754                  * and the activity log; */
 755                 md_size_sect += MD_BM_OFFSET;
 756
 757                 bdev->md.md_size_sect = md_size_sect;
 758                 /* bitmap offset is adjusted by 'super' block size */
 759                 bdev->md.bm_offset   = -md_size_sect + MD_AL_OFFSET;
 760                 break;
 761         }
 762         rcu_read_unlock();
 763 }
 764
 765 /* input size is expected to be in KB */
 766 char *ppsize(char *buf, unsigned long long size)
 767 {
 768         /* Needs 9 bytes at max including trailing NUL:
 769          * -1ULL ==> "16384 EB" */
 770         static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
 771         int base = 0;
 772         while (size >= 10000 && base < sizeof(units)-1) {
 773                 /* shift + round */
 774                 size = (size >> 10) + !!(size & (1<<9));
 775                 base++;
 776         }
 777         sprintf(buf, "%u %cB", (unsigned)size, units[base]);
 778
 779         return buf;
 780 }
 781
 782 /* there is still a theoretical deadlock when called from receiver
 783  * on an D_INCONSISTENT R_PRIMARY:
 784  *  remote READ does inc_ap_bio, receiver would need to receive answer
 785  *  packet from remote to dec_ap_bio again.
 786  *  receiver receive_sizes(), comes here,
 787  *  waits for ap_bio_cnt == 0. -> deadlock.
 788  * but this cannot happen, actually, because:
 789  *  R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
 790  *  (not connected, or bad/no disk on peer):
 791  *  see drbd_fail_request_early, ap_bio_cnt is zero.
 792  *  R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
 793  *  peer may not initiate a resize.
 794  */
 795 /* Note these are not to be confused with
 796  * drbd_adm_suspend_io/drbd_adm_resume_io,
 797  * which are (sub) state changes triggered by admin (drbdsetup),
 798  * and can be long lived.
 799  * This changes an mdev->flag, is triggered by drbd internals,
 800  * and should be short-lived. */
 801 void drbd_suspend_io(struct drbd_conf *mdev)
 802 {
 803         set_bit(SUSPEND_IO, &mdev->flags);
 804         if (drbd_suspended(mdev))
 805                 return;
 806         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
 807 }
 808
 809 void drbd_resume_io(struct drbd_conf *mdev)
 810 {
 811         clear_bit(SUSPEND_IO, &mdev->flags);
 812         wake_up(&mdev->misc_wait);
 813 }
 814
 815 /**
 816  * drbd_determine_dev_size() -  Sets the right device size obeying all constraints
 817  * @mdev:       DRBD device.
 818  *
 819  * Returns 0 on success, negative return values indicate errors.
 820  * You should call drbd_md_sync() after calling this function.
 821  */
 822 enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
 823 {
 824         sector_t prev_first_sect, prev_size; /* previous meta location */
 825         sector_t la_size, u_size;
 826         sector_t size;
 827         char ppb[10];
 828
 829         int md_moved, la_size_changed;
 830         enum determine_dev_size rv = unchanged;
 831
 832         /* race:
 833          * application request passes inc_ap_bio,
 834          * but then cannot get an AL-reference.
 835          * this function later may wait on ap_bio_cnt == 0. -> deadlock.
 836          *
 837          * to avoid that:
 838          * Suspend IO right here.
 839          * still lock the act_log to not trigger ASSERTs there.
 840          */
 841         drbd_suspend_io(mdev);
 842
 843         /* no wait necessary anymore, actually we could assert that */
 844         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
 845
 846         prev_first_sect = drbd_md_first_sector(mdev->ldev);
 847         prev_size = mdev->ldev->md.md_size_sect;
 848         la_size = mdev->ldev->md.la_size_sect;
 849
 850         /* TODO: should only be some assert here, not (re)init... */
 851         drbd_md_set_sector_offsets(mdev, mdev->ldev);
 852
 853         rcu_read_lock();
 854         u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
 855         rcu_read_unlock();
 856         size = drbd_new_dev_size(mdev, mdev->ldev, u_size, flags & DDSF_FORCED);
 857
 858         if (drbd_get_capacity(mdev->this_bdev) != size ||
 859             drbd_bm_capacity(mdev) != size) {
 860                 int err;
 861                 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
 862                 if (unlikely(err)) {
 863                         /* currently there is only one error: ENOMEM! */
 864                         size = drbd_bm_capacity(mdev)>>1;
 865                         if (size == 0) {
 866                                 dev_err(DEV, "OUT OF MEMORY! "
 867                                     "Could not allocate bitmap!\n");
 868                         } else {
 869                                 dev_err(DEV, "BM resizing failed. "
 870                                     "Leaving size unchanged at size = %lu KB\n",
 871                                     (unsigned long)size);
 872                         }
 873                         rv = dev_size_error;
 874                 }
 875                 /* racy, see comments above. */
 876                 drbd_set_my_capacity(mdev, size);
 877                 mdev->ldev->md.la_size_sect = size;
 878                 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
 879                      (unsigned long long)size>>1);
 880         }
 881         if (rv == dev_size_error)
 882                 goto out;
 883
 884         la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
 885
 886         md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
 887                 || prev_size       != mdev->ldev->md.md_size_sect;
 888
 889         if (la_size_changed || md_moved) {
 890                 int err;
 891
 892                 drbd_al_shrink(mdev); /* All extents inactive. */
 893                 dev_info(DEV, "Writing the whole bitmap, %s\n",
 894                          la_size_changed && md_moved ? "size changed and md moved" :
 895                          la_size_changed ? "size changed" : "md moved");
 896                 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
 897                 err = drbd_bitmap_io(mdev, &drbd_bm_write,
 898                                 "size changed", BM_LOCKED_MASK);
 899                 if (err) {
 900                         rv = dev_size_error;
 901                         goto out;
 902                 }
 903                 drbd_md_mark_dirty(mdev);
 904         }
 905
 906         if (size > la_size)
 907                 rv = grew;
 908         if (size < la_size)
 909                 rv = shrunk;
 910 out:
 911         lc_unlock(mdev->act_log);
 912         wake_up(&mdev->al_wait);
 913         drbd_resume_io(mdev);
 914
 915         return rv;
 916 }
 917
 918 sector_t
 919 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
 920                   sector_t u_size, int assume_peer_has_space)
 921 {
 922         sector_t p_size = mdev->p_size;   /* partner's disk size. */
 923         sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
 924         sector_t m_size; /* my size */
 925         sector_t size = 0;
 926
 927         m_size = drbd_get_max_capacity(bdev);
 928
 929         if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
 930                 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
 931                 p_size = m_size;
 932         }
 933
 934         if (p_size && m_size) {
 935                 size = min_t(sector_t, p_size, m_size);
 936         } else {
 937                 if (la_size) {
 938                         size = la_size;
 939                         if (m_size && m_size < size)
 940                                 size = m_size;
 941                         if (p_size && p_size < size)
 942                                 size = p_size;
 943                 } else {
 944                         if (m_size)
 945                                 size = m_size;
 946                         if (p_size)
 947                                 size = p_size;
 948                 }
 949         }
 950
 951         if (size == 0)
 952                 dev_err(DEV, "Both nodes diskless!\n");
 953
 954         if (u_size) {
 955                 if (u_size > size)
 956                         dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
 957                             (unsigned long)u_size>>1, (unsigned long)size>>1);
 958                 else
 959                         size = u_size;
 960         }
 961
 962         return size;
 963 }
 964
 965 /**
 966  * drbd_check_al_size() - Ensures that the AL is of the right size
 967  * @mdev:       DRBD device.
 968  *
 969  * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
 970  * failed, and 0 on success. You should call drbd_md_sync() after you called
 971  * this function.
 972  */
 973 static int drbd_check_al_size(struct drbd_conf *mdev, struct disk_conf *dc)
 974 {
 975         struct lru_cache *n, *t;
 976         struct lc_element *e;
 977         unsigned int in_use;
 978         int i;
 979
 980         if (mdev->act_log &&
 981             mdev->act_log->nr_elements == dc->al_extents)
 982                 return 0;
 983
 984         in_use = 0;
 985         t = mdev->act_log;
 986         n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
 987                 dc->al_extents, sizeof(struct lc_element), 0);
 988
 989         if (n == NULL) {
 990                 dev_err(DEV, "Cannot allocate act_log lru!\n");
 991                 return -ENOMEM;
 992         }
 993         spin_lock_irq(&mdev->al_lock);
 994         if (t) {
 995                 for (i = 0; i < t->nr_elements; i++) {
 996                         e = lc_element_by_index(t, i);
 997                         if (e->refcnt)
 998                                 dev_err(DEV, "refcnt(%d)==%d\n",
 999                                     e->lc_number, e->refcnt);
1000                         in_use += e->refcnt;
1001                 }
1002         }
1003         if (!in_use)
1004                 mdev->act_log = n;
1005         spin_unlock_irq(&mdev->al_lock);
1006         if (in_use) {
1007                 dev_err(DEV, "Activity log still in use!\n");
1008                 lc_destroy(n);
1009                 return -EBUSY;
1010         } else {
1011                 if (t)
1012                         lc_destroy(t);
1013         }
1014         drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
1015         return 0;
1016 }
1017
1018 static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
1019 {
1020         struct request_queue * const q = mdev->rq_queue;
1021         int max_hw_sectors = max_bio_size >> 9;
1022         int max_segments = 0;
1023
1024         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1025                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1026
1027                 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
1028                 rcu_read_lock();
1029                 max_segments = rcu_dereference(mdev->ldev->disk_conf)->max_bio_bvecs;
1030                 rcu_read_unlock();
1031                 put_ldev(mdev);
1032         }
1033
1034         blk_queue_logical_block_size(q, 512);
1035         blk_queue_max_hw_sectors(q, max_hw_sectors);
1036         /* This is the workaround for "bio would need to, but cannot, be split" */
1037         blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1038         blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
1039
1040         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1041                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1042
1043                 blk_queue_stack_limits(q, b);
1044
1045                 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
1046                         dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
1047                                  q->backing_dev_info.ra_pages,
1048                                  b->backing_dev_info.ra_pages);
1049                         q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1050                 }
1051                 put_ldev(mdev);
1052         }
1053 }
1054
1055 void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
1056 {
1057         int now, new, local, peer;
1058
1059         now = queue_max_hw_sectors(mdev->rq_queue) << 9;
1060         local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
1061         peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
1062
1063         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1064                 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
1065                 mdev->local_max_bio_size = local;
1066                 put_ldev(mdev);
1067         }
1068
1069         /* We may ignore peer limits if the peer is modern enough.
1070            Because new from 8.3.8 onwards the peer can use multiple
1071            BIOs for a single peer_request */
1072         if (mdev->state.conn >= C_CONNECTED) {
1073                 if (mdev->tconn->agreed_pro_version < 94)
1074                         peer = min_t(int, mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
1075                         /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
1076                 else if (mdev->tconn->agreed_pro_version == 94)
1077                         peer = DRBD_MAX_SIZE_H80_PACKET;
1078                 else if (mdev->tconn->agreed_pro_version < 100)
1079                         peer = DRBD_MAX_BIO_SIZE_P95;  /* drbd 8.3.8 onwards, before 8.4.0 */
1080                 else
1081                         peer = DRBD_MAX_BIO_SIZE;
1082         }
1083
1084         new = min_t(int, local, peer);
1085
1086         if (mdev->state.role == R_PRIMARY && new < now)
1087                 dev_err(DEV, "ASSERT FAILED new < now; (%d < %d)\n", new, now);
1088
1089         if (new != now)
1090                 dev_info(DEV, "max BIO size = %u\n", new);
1091
1092         drbd_setup_queue_param(mdev, new);
1093 }
1094
1095 /* Starts the worker thread */
1096 static void conn_reconfig_start(struct drbd_tconn *tconn)
1097 {
1098         drbd_thread_start(&tconn->worker);
1099         conn_flush_workqueue(tconn);
1100 }
1101
1102 /* if still unconfigured, stops worker again. */
1103 static void conn_reconfig_done(struct drbd_tconn *tconn)
1104 {
1105         bool stop_threads;
1106         spin_lock_irq(&tconn->req_lock);
1107         stop_threads = conn_all_vols_unconf(tconn) &&
1108                 tconn->cstate == C_STANDALONE;
1109         spin_unlock_irq(&tconn->req_lock);
1110         if (stop_threads) {
1111                 /* asender is implicitly stopped by receiver
1112                  * in conn_disconnect() */
1113                 drbd_thread_stop(&tconn->receiver);
1114                 drbd_thread_stop(&tconn->worker);
1115         }
1116 }
1117
1118 /* Make sure IO is suspended before calling this function(). */
1119 static void drbd_suspend_al(struct drbd_conf *mdev)
1120 {
1121         int s = 0;
1122
1123         if (!lc_try_lock(mdev->act_log)) {
1124                 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
1125                 return;
1126         }
1127
1128         drbd_al_shrink(mdev);
1129         spin_lock_irq(&mdev->tconn->req_lock);
1130         if (mdev->state.conn < C_CONNECTED)
1131                 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
1132         spin_unlock_irq(&mdev->tconn->req_lock);
1133         lc_unlock(mdev->act_log);
1134
1135         if (s)
1136                 dev_info(DEV, "Suspended AL updates\n");
1137 }
1138
1139
1140 static bool should_set_defaults(struct genl_info *info)
1141 {
1142         unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1143         return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1144 }
1145
1146 static void enforce_disk_conf_limits(struct disk_conf *dc)
1147 {
1148         if (dc->al_extents < DRBD_AL_EXTENTS_MIN)
1149                 dc->al_extents = DRBD_AL_EXTENTS_MIN;
1150         if (dc->al_extents > DRBD_AL_EXTENTS_MAX)
1151                 dc->al_extents = DRBD_AL_EXTENTS_MAX;
1152
1153         if (dc->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1154                 dc->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1155 }
1156
1157 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1158 {
1159         enum drbd_ret_code retcode;
1160         struct drbd_conf *mdev;
1161         struct disk_conf *new_disk_conf, *old_disk_conf;
1162         struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
1163         int err, fifo_size;
1164
1165         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1166         if (!adm_ctx.reply_skb)
1167                 return retcode;
1168         if (retcode != NO_ERROR)
1169                 goto out;
1170
1171         mdev = adm_ctx.mdev;
1172
1173         /* we also need a disk
1174          * to change the options on */
1175         if (!get_ldev(mdev)) {
1176                 retcode = ERR_NO_DISK;
1177                 goto out;
1178         }
1179
1180         new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
1181         if (!new_disk_conf) {
1182                 retcode = ERR_NOMEM;
1183                 goto fail;
1184         }
1185
1186         mutex_lock(&mdev->tconn->conf_update);
1187         old_disk_conf = mdev->ldev->disk_conf;
1188         *new_disk_conf = *old_disk_conf;
1189         if (should_set_defaults(info))
1190                 set_disk_conf_defaults(new_disk_conf);
1191
1192         err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1193         if (err && err != -ENOMSG) {
1194                 retcode = ERR_MANDATORY_TAG;
1195                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1196         }
1197
1198         if (!expect(new_disk_conf->resync_rate >= 1))
1199                 new_disk_conf->resync_rate = 1;
1200
1201         enforce_disk_conf_limits(new_disk_conf);
1202
1203         fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1204         if (fifo_size != mdev->rs_plan_s->size) {
1205                 new_plan = fifo_alloc(fifo_size);
1206                 if (!new_plan) {
1207                         dev_err(DEV, "kmalloc of fifo_buffer failed");
1208                         retcode = ERR_NOMEM;
1209                         goto fail_unlock;
1210                 }
1211         }
1212
1213         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1214         drbd_al_shrink(mdev);
1215         err = drbd_check_al_size(mdev, new_disk_conf);
1216         lc_unlock(mdev->act_log);
1217         wake_up(&mdev->al_wait);
1218
1219         if (err) {
1220                 retcode = ERR_NOMEM;
1221                 goto fail_unlock;
1222         }
1223
1224         write_lock_irq(&global_state_lock);
1225         retcode = drbd_resync_after_valid(mdev, new_disk_conf->resync_after);
1226         if (retcode == NO_ERROR) {
1227                 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
1228                 drbd_resync_after_changed(mdev);
1229         }
1230         write_unlock_irq(&global_state_lock);
1231
1232         if (retcode != NO_ERROR)
1233                 goto fail_unlock;
1234
1235         if (new_plan) {
1236                 old_plan = mdev->rs_plan_s;
1237                 rcu_assign_pointer(mdev->rs_plan_s, new_plan);
1238         }
1239
1240         mutex_unlock(&mdev->tconn->conf_update);
1241
1242         if (new_disk_conf->al_updates)
1243                 mdev->ldev->md.flags &= MDF_AL_DISABLED;
1244         else
1245                 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1246
1247         drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1248
1249         drbd_md_sync(mdev);
1250
1251         if (mdev->state.conn >= C_CONNECTED)
1252                 drbd_send_sync_param(mdev);
1253
1254         synchronize_rcu();
1255         kfree(old_disk_conf);
1256         kfree(old_plan);
1257         mod_timer(&mdev->request_timer, jiffies + HZ);
1258         goto success;
1259
1260 fail_unlock:
1261         mutex_unlock(&mdev->tconn->conf_update);
1262  fail:
1263         kfree(new_disk_conf);
1264         kfree(new_plan);
1265 success:
1266         put_ldev(mdev);
1267  out:
1268         drbd_adm_finish(info, retcode);
1269         return 0;
1270 }
1271
1272 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1273 {
1274         struct drbd_conf *mdev;
1275         int err;
1276         enum drbd_ret_code retcode;
1277         enum determine_dev_size dd;
1278         sector_t max_possible_sectors;
1279         sector_t min_md_device_sectors;
1280         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1281         struct disk_conf *new_disk_conf = NULL;
1282         struct block_device *bdev;
1283         struct lru_cache *resync_lru = NULL;
1284         struct fifo_buffer *new_plan = NULL;
1285         union drbd_state ns, os;
1286         enum drbd_state_rv rv;
1287         struct net_conf *nc;
1288
1289         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1290         if (!adm_ctx.reply_skb)
1291                 return retcode;
1292         if (retcode != NO_ERROR)
1293                 goto finish;
1294
1295         mdev = adm_ctx.mdev;
1296         conn_reconfig_start(mdev->tconn);
1297
1298         /* if you want to reconfigure, please tear down first */
1299         if (mdev->state.disk > D_DISKLESS) {
1300                 retcode = ERR_DISK_CONFIGURED;
1301                 goto fail;
1302         }
1303         /* It may just now have detached because of IO error.  Make sure
1304          * drbd_ldev_destroy is done already, we may end up here very fast,
1305          * e.g. if someone calls attach from the on-io-error handler,
1306          * to realize a "hot spare" feature (not that I'd recommend that) */
1307         wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1308
1309         /* make sure there is no leftover from previous force-detach attempts */
1310         clear_bit(FORCE_DETACH, &mdev->flags);
1311
1312         /* and no leftover from previously aborted resync or verify, either */
1313         mdev->rs_total = 0;
1314         mdev->rs_failed = 0;
1315         atomic_set(&mdev->rs_pending_cnt, 0);
1316
1317         /* allocation not in the IO path, drbdsetup context */
1318         nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1319         if (!nbc) {
1320                 retcode = ERR_NOMEM;
1321                 goto fail;
1322         }
1323         new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1324         if (!new_disk_conf) {
1325                 retcode = ERR_NOMEM;
1326                 goto fail;
1327         }
1328         nbc->disk_conf = new_disk_conf;
1329
1330         set_disk_conf_defaults(new_disk_conf);
1331         err = disk_conf_from_attrs(new_disk_conf, info);
1332         if (err) {
1333                 retcode = ERR_MANDATORY_TAG;
1334                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1335                 goto fail;
1336         }
1337
1338         enforce_disk_conf_limits(new_disk_conf);
1339
1340         new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1341         if (!new_plan) {
1342                 retcode = ERR_NOMEM;
1343                 goto fail;
1344         }
1345
1346         if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1347                 retcode = ERR_MD_IDX_INVALID;
1348                 goto fail;
1349         }
1350
1351         rcu_read_lock();
1352         nc = rcu_dereference(mdev->tconn->net_conf);
1353         if (nc) {
1354                 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1355                         rcu_read_unlock();
1356                         retcode = ERR_STONITH_AND_PROT_A;
1357                         goto fail;
1358                 }
1359         }
1360         rcu_read_unlock();
1361
1362         bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
1363                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
1364         if (IS_ERR(bdev)) {
1365                 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
1366                         PTR_ERR(bdev));
1367                 retcode = ERR_OPEN_DISK;
1368                 goto fail;
1369         }
1370         nbc->backing_bdev = bdev;
1371
1372         /*
1373          * meta_dev_idx >= 0: external fixed size, possibly multiple
1374          * drbd sharing one meta device.  TODO in that case, paranoia
1375          * check that [md_bdev, meta_dev_idx] is not yet used by some
1376          * other drbd minor!  (if you use drbd.conf + drbdadm, that
1377          * should check it for you already; but if you don't, or
1378          * someone fooled it, we need to double check here)
1379          */
1380         bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
1381                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1382                                   (new_disk_conf->meta_dev_idx < 0) ?
1383                                   (void *)mdev : (void *)drbd_m_holder);
1384         if (IS_ERR(bdev)) {
1385                 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
1386                         PTR_ERR(bdev));
1387                 retcode = ERR_OPEN_MD_DISK;
1388                 goto fail;
1389         }
1390         nbc->md_bdev = bdev;
1391
1392         if ((nbc->backing_bdev == nbc->md_bdev) !=
1393             (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1394              new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1395                 retcode = ERR_MD_IDX_INVALID;
1396                 goto fail;
1397         }
1398
1399         resync_lru = lc_create("resync", drbd_bm_ext_cache,
1400                         1, 61, sizeof(struct bm_extent),
1401                         offsetof(struct bm_extent, lce));
1402         if (!resync_lru) {
1403                 retcode = ERR_NOMEM;
1404                 goto fail;
1405         }
1406
1407         /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1408         drbd_md_set_sector_offsets(mdev, nbc);
1409
1410         if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
1411                 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1412                         (unsigned long long) drbd_get_max_capacity(nbc),
1413                         (unsigned long long) new_disk_conf->disk_size);
1414                 retcode = ERR_DISK_TOO_SMALL;
1415                 goto fail;
1416         }
1417
1418         if (new_disk_conf->meta_dev_idx < 0) {
1419                 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1420                 /* at least one MB, otherwise it does not make sense */
1421                 min_md_device_sectors = (2<<10);
1422         } else {
1423                 max_possible_sectors = DRBD_MAX_SECTORS;
1424                 min_md_device_sectors = MD_RESERVED_SECT * (new_disk_conf->meta_dev_idx + 1);
1425         }
1426
1427         if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1428                 retcode = ERR_MD_DISK_TOO_SMALL;
1429                 dev_warn(DEV, "refusing attach: md-device too small, "
1430                      "at least %llu sectors needed for this meta-disk type\n",
1431                      (unsigned long long) min_md_device_sectors);
1432                 goto fail;
1433         }
1434
1435         /* Make sure the new disk is big enough
1436          * (we may currently be R_PRIMARY with no local disk...) */
1437         if (drbd_get_max_capacity(nbc) <
1438             drbd_get_capacity(mdev->this_bdev)) {
1439                 retcode = ERR_DISK_TOO_SMALL;
1440                 goto fail;
1441         }
1442
1443         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1444
1445         if (nbc->known_size > max_possible_sectors) {
1446                 dev_warn(DEV, "==> truncating very big lower level device "
1447                         "to currently maximum possible %llu sectors <==\n",
1448                         (unsigned long long) max_possible_sectors);
1449                 if (new_disk_conf->meta_dev_idx >= 0)
1450                         dev_warn(DEV, "==>> using internal or flexible "
1451                                       "meta data may help <<==\n");
1452         }
1453
1454         drbd_suspend_io(mdev);
1455         /* also wait for the last barrier ack. */
1456         /* FIXME see also https://daiquiri.linbit/cgi-bin/bugzilla/show_bug.cgi?id=171
1457          * We need a way to either ignore barrier acks for barriers sent before a device
1458          * was attached, or a way to wait for all pending barrier acks to come in.
1459          * As barriers are counted per resource,
1460          * we'd need to suspend io on all devices of a resource.
1461          */
1462         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || drbd_suspended(mdev));
1463         /* and for any other previously queued work */
1464         drbd_flush_workqueue(mdev);
1465
1466         rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1467         retcode = rv;  /* FIXME: Type mismatch. */
1468         drbd_resume_io(mdev);
1469         if (rv < SS_SUCCESS)
1470                 goto fail;
1471
1472         if (!get_ldev_if_state(mdev, D_ATTACHING))
1473                 goto force_diskless;
1474
1475         drbd_md_set_sector_offsets(mdev, nbc);
1476
1477         if (!mdev->bitmap) {
1478                 if (drbd_bm_init(mdev)) {
1479                         retcode = ERR_NOMEM;
1480                         goto force_diskless_dec;
1481                 }
1482         }
1483
1484         retcode = drbd_md_read(mdev, nbc);
1485         if (retcode != NO_ERROR)
1486                 goto force_diskless_dec;
1487
1488         if (mdev->state.conn < C_CONNECTED &&
1489             mdev->state.role == R_PRIMARY &&
1490             (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1491                 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1492                     (unsigned long long)mdev->ed_uuid);
1493                 retcode = ERR_DATA_NOT_CURRENT;
1494                 goto force_diskless_dec;
1495         }
1496
1497         /* Since we are diskless, fix the activity log first... */
1498         if (drbd_check_al_size(mdev, new_disk_conf)) {
1499                 retcode = ERR_NOMEM;
1500                 goto force_diskless_dec;
1501         }
1502
1503         /* Prevent shrinking of consistent devices ! */
1504         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1505             drbd_new_dev_size(mdev, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
1506                 dev_warn(DEV, "refusing to truncate a consistent device\n");
1507                 retcode = ERR_DISK_TOO_SMALL;
1508                 goto force_diskless_dec;
1509         }
1510
1511         /* Reset the "barriers don't work" bits here, then force meta data to
1512          * be written, to ensure we determine if barriers are supported. */
1513         if (new_disk_conf->md_flushes)
1514                 clear_bit(MD_NO_FUA, &mdev->flags);
1515         else
1516                 set_bit(MD_NO_FUA, &mdev->flags);
1517
1518         /* Point of no return reached.
1519          * Devices and memory are no longer released by error cleanup below.
1520          * now mdev takes over responsibility, and the state engine should
1521          * clean it up somewhere.  */
1522         D_ASSERT(mdev->ldev == NULL);
1523         mdev->ldev = nbc;
1524         mdev->resync = resync_lru;
1525         mdev->rs_plan_s = new_plan;
1526         nbc = NULL;
1527         resync_lru = NULL;
1528         new_disk_conf = NULL;
1529         new_plan = NULL;
1530
1531         drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1532
1533         if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1534                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1535         else
1536                 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1537
1538         if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1539             !(mdev->state.role == R_PRIMARY && mdev->tconn->susp_nod))
1540                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1541
1542         mdev->send_cnt = 0;
1543         mdev->recv_cnt = 0;
1544         mdev->read_cnt = 0;
1545         mdev->writ_cnt = 0;
1546
1547         drbd_reconsider_max_bio_size(mdev);
1548
1549         /* If I am currently not R_PRIMARY,
1550          * but meta data primary indicator is set,
1551          * I just now recover from a hard crash,
1552          * and have been R_PRIMARY before that crash.
1553          *
1554          * Now, if I had no connection before that crash
1555          * (have been degraded R_PRIMARY), chances are that
1556          * I won't find my peer now either.
1557          *
1558          * In that case, and _only_ in that case,
1559          * we use the degr-wfc-timeout instead of the default,
1560          * so we can automatically recover from a crash of a
1561          * degraded but active "cluster" after a certain timeout.
1562          */
1563         clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1564         if (mdev->state.role != R_PRIMARY &&
1565              drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1566             !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1567                 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1568
1569         dd = drbd_determine_dev_size(mdev, 0);
1570         if (dd == dev_size_error) {
1571                 retcode = ERR_NOMEM_BITMAP;
1572                 goto force_diskless_dec;
1573         } else if (dd == grew)
1574                 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1575
1576         if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC) ||
1577             (test_bit(CRASHED_PRIMARY, &mdev->flags) &&
1578              drbd_md_test_flag(mdev->ldev, MDF_AL_DISABLED))) {
1579                 dev_info(DEV, "Assuming that all blocks are out of sync "
1580                      "(aka FullSync)\n");
1581                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1582                         "set_n_write from attaching", BM_LOCKED_MASK)) {
1583                         retcode = ERR_IO_MD_DISK;
1584                         goto force_diskless_dec;
1585                 }
1586         } else {
1587                 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1588                         "read from attaching", BM_LOCKED_MASK)) {
1589                         retcode = ERR_IO_MD_DISK;
1590                         goto force_diskless_dec;
1591                 }
1592         }
1593
1594         if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1595                 drbd_suspend_al(mdev); /* IO is still suspended here... */
1596
1597         spin_lock_irq(&mdev->tconn->req_lock);
1598         os = drbd_read_state(mdev);
1599         ns = os;
1600         /* If MDF_CONSISTENT is not set go into inconsistent state,
1601            otherwise investigate MDF_WasUpToDate...
1602            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1603            otherwise into D_CONSISTENT state.
1604         */
1605         if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1606                 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1607                         ns.disk = D_CONSISTENT;
1608                 else
1609                         ns.disk = D_OUTDATED;
1610         } else {
1611                 ns.disk = D_INCONSISTENT;
1612         }
1613
1614         if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1615                 ns.pdsk = D_OUTDATED;
1616
1617         rcu_read_lock();
1618         if (ns.disk == D_CONSISTENT &&
1619             (ns.pdsk == D_OUTDATED || rcu_dereference(mdev->ldev->disk_conf)->fencing == FP_DONT_CARE))
1620                 ns.disk = D_UP_TO_DATE;
1621
1622         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1623            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1624            this point, because drbd_request_state() modifies these
1625            flags. */
1626
1627         if (rcu_dereference(mdev->ldev->disk_conf)->al_updates)
1628                 mdev->ldev->md.flags &= MDF_AL_DISABLED;
1629         else
1630                 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1631
1632         rcu_read_unlock();
1633
1634         /* In case we are C_CONNECTED postpone any decision on the new disk
1635            state after the negotiation phase. */
1636         if (mdev->state.conn == C_CONNECTED) {
1637                 mdev->new_state_tmp.i = ns.i;
1638                 ns.i = os.i;
1639                 ns.disk = D_NEGOTIATING;
1640
1641                 /* We expect to receive up-to-date UUIDs soon.
1642                    To avoid a race in receive_state, free p_uuid while
1643                    holding req_lock. I.e. atomic with the state change */
1644                 kfree(mdev->p_uuid);
1645                 mdev->p_uuid = NULL;
1646         }
1647
1648         rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1649         spin_unlock_irq(&mdev->tconn->req_lock);
1650
1651         if (rv < SS_SUCCESS)
1652                 goto force_diskless_dec;
1653
1654         mod_timer(&mdev->request_timer, jiffies + HZ);
1655
1656         if (mdev->state.role == R_PRIMARY)
1657                 mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1658         else
1659                 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1660
1661         drbd_md_mark_dirty(mdev);
1662         drbd_md_sync(mdev);
1663
1664         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1665         put_ldev(mdev);
1666         conn_reconfig_done(mdev->tconn);
1667         drbd_adm_finish(info, retcode);
1668         return 0;
1669
1670  force_diskless_dec:
1671         put_ldev(mdev);
1672  force_diskless:
1673         drbd_force_state(mdev, NS(disk, D_DISKLESS));
1674         drbd_md_sync(mdev);
1675  fail:
1676         conn_reconfig_done(mdev->tconn);
1677         if (nbc) {
1678                 if (nbc->backing_bdev)
1679                         blkdev_put(nbc->backing_bdev,
1680                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1681                 if (nbc->md_bdev)
1682                         blkdev_put(nbc->md_bdev,
1683                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1684                 kfree(nbc);
1685         }
1686         kfree(new_disk_conf);
1687         lc_destroy(resync_lru);
1688         kfree(new_plan);
1689
1690  finish:
1691         drbd_adm_finish(info, retcode);
1692         return 0;
1693 }
1694
1695 static int adm_detach(struct drbd_conf *mdev, int force)
1696 {
1697         enum drbd_state_rv retcode;
1698         int ret;
1699
1700         if (force) {
1701                 set_bit(FORCE_DETACH, &mdev->flags);
1702                 drbd_force_state(mdev, NS(disk, D_FAILED));
1703                 retcode = SS_SUCCESS;
1704                 goto out;
1705         }
1706
1707         drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1708         drbd_md_get_buffer(mdev); /* make sure there is no in-flight meta-data IO */
1709         retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1710         drbd_md_put_buffer(mdev);
1711         /* D_FAILED will transition to DISKLESS. */
1712         ret = wait_event_interruptible(mdev->misc_wait,
1713                         mdev->state.disk != D_FAILED);
1714         drbd_resume_io(mdev);
1715         if ((int)retcode == (int)SS_IS_DISKLESS)
1716                 retcode = SS_NOTHING_TO_DO;
1717         if (ret)
1718                 retcode = ERR_INTR;
1719 out:
1720         return retcode;
1721 }
1722
1723 /* Detaching the disk is a process in multiple stages.  First we need to lock
1724  * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1725  * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1726  * internal references as well.
1727  * Only then we have finally detached. */
1728 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
1729 {
1730         enum drbd_ret_code retcode;
1731         struct detach_parms parms = { };
1732         int err;
1733
1734         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1735         if (!adm_ctx.reply_skb)
1736                 return retcode;
1737         if (retcode != NO_ERROR)
1738                 goto out;
1739
1740         if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
1741                 err = detach_parms_from_attrs(&parms, info);
1742                 if (err) {
1743                         retcode = ERR_MANDATORY_TAG;
1744                         drbd_msg_put_info(from_attrs_err_to_txt(err));
1745                         goto out;
1746                 }
1747         }
1748
1749         retcode = adm_detach(adm_ctx.mdev, parms.force_detach);
1750 out:
1751         drbd_adm_finish(info, retcode);
1752         return 0;
1753 }
1754
1755 static bool conn_resync_running(struct drbd_tconn *tconn)
1756 {
1757         struct drbd_conf *mdev;
1758         bool rv = false;
1759         int vnr;
1760
1761         rcu_read_lock();
1762         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1763                 if (mdev->state.conn == C_SYNC_SOURCE ||
1764                     mdev->state.conn == C_SYNC_TARGET ||
1765                     mdev->state.conn == C_PAUSED_SYNC_S ||
1766                     mdev->state.conn == C_PAUSED_SYNC_T) {
1767                         rv = true;
1768                         break;
1769                 }
1770         }
1771         rcu_read_unlock();
1772
1773         return rv;
1774 }
1775
1776 static bool conn_ov_running(struct drbd_tconn *tconn)
1777 {
1778         struct drbd_conf *mdev;
1779         bool rv = false;
1780         int vnr;
1781
1782         rcu_read_lock();
1783         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1784                 if (mdev->state.conn == C_VERIFY_S ||
1785                     mdev->state.conn == C_VERIFY_T) {
1786                         rv = true;
1787                         break;
1788                 }
1789         }
1790         rcu_read_unlock();
1791
1792         return rv;
1793 }
1794
1795 static enum drbd_ret_code
1796 _check_net_options(struct drbd_tconn *tconn, struct net_conf *old_conf, struct net_conf *new_conf)
1797 {
1798         struct drbd_conf *mdev;
1799         int i;
1800
1801         if (old_conf && tconn->cstate == C_WF_REPORT_PARAMS && tconn->agreed_pro_version < 100) {
1802                 if (new_conf->wire_protocol != old_conf->wire_protocol)
1803                         return ERR_NEED_APV_100;
1804
1805                 if (new_conf->two_primaries != old_conf->two_primaries)
1806                         return ERR_NEED_APV_100;
1807
1808                 if (!new_conf->integrity_alg != !old_conf->integrity_alg)
1809                         return ERR_NEED_APV_100;
1810
1811                 if (strcmp(new_conf->integrity_alg, old_conf->integrity_alg))
1812                         return ERR_NEED_APV_100;
1813         }
1814
1815         if (!new_conf->two_primaries &&
1816             conn_highest_role(tconn) == R_PRIMARY &&
1817             conn_highest_peer(tconn) == R_PRIMARY)
1818                 return ERR_NEED_ALLOW_TWO_PRI;
1819
1820         if (new_conf->two_primaries &&
1821             (new_conf->wire_protocol != DRBD_PROT_C))
1822                 return ERR_NOT_PROTO_C;
1823
1824         idr_for_each_entry(&tconn->volumes, mdev, i) {
1825                 if (get_ldev(mdev)) {
1826                         enum drbd_fencing_p fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
1827                         put_ldev(mdev);
1828                         if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
1829                                 return ERR_STONITH_AND_PROT_A;
1830                 }
1831                 if (mdev->state.role == R_PRIMARY && new_conf->discard_my_data)
1832                         return ERR_DISCARD;
1833         }
1834
1835         if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A)
1836                 return ERR_CONG_NOT_PROTO_A;
1837
1838         return NO_ERROR;
1839 }
1840
1841 static enum drbd_ret_code
1842 check_net_options(struct drbd_tconn *tconn, struct net_conf *new_conf)
1843 {
1844         static enum drbd_ret_code rv;
1845         struct drbd_conf *mdev;
1846         int i;
1847
1848         rcu_read_lock();
1849         rv = _check_net_options(tconn, rcu_dereference(tconn->net_conf), new_conf);
1850         rcu_read_unlock();
1851
1852         /* tconn->volumes protected by genl_lock() here */
1853         idr_for_each_entry(&tconn->volumes, mdev, i) {
1854                 if (!mdev->bitmap) {
1855                         if(drbd_bm_init(mdev))
1856                                 return ERR_NOMEM;
1857                 }
1858         }
1859
1860         return rv;
1861 }
1862
1863 struct crypto {
1864         struct crypto_hash *verify_tfm;
1865         struct crypto_hash *csums_tfm;
1866         struct crypto_hash *cram_hmac_tfm;
1867         struct crypto_hash *integrity_tfm;
1868 };
1869
1870 static int
1871 alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
1872 {
1873         if (!tfm_name[0])
1874                 return NO_ERROR;
1875
1876         *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
1877         if (IS_ERR(*tfm)) {
1878                 *tfm = NULL;
1879                 return err_alg;
1880         }
1881
1882         return NO_ERROR;
1883 }
1884
1885 static enum drbd_ret_code
1886 alloc_crypto(struct crypto *crypto, struct net_conf *new_conf)
1887 {
1888         char hmac_name[CRYPTO_MAX_ALG_NAME];
1889         enum drbd_ret_code rv;
1890
1891         rv = alloc_hash(&crypto->csums_tfm, new_conf->csums_alg,
1892                        ERR_CSUMS_ALG);
1893         if (rv != NO_ERROR)
1894                 return rv;
1895         rv = alloc_hash(&crypto->verify_tfm, new_conf->verify_alg,
1896                        ERR_VERIFY_ALG);
1897         if (rv != NO_ERROR)
1898                 return rv;
1899         rv = alloc_hash(&crypto->integrity_tfm, new_conf->integrity_alg,
1900                        ERR_INTEGRITY_ALG);
1901         if (rv != NO_ERROR)
1902                 return rv;
1903         if (new_conf->cram_hmac_alg[0] != 0) {
1904                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1905                          new_conf->cram_hmac_alg);
1906
1907                 rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
1908                                ERR_AUTH_ALG);
1909         }
1910
1911         return rv;
1912 }
1913
1914 static void free_crypto(struct crypto *crypto)
1915 {
1916         crypto_free_hash(crypto->cram_hmac_tfm);
1917         crypto_free_hash(crypto->integrity_tfm);
1918         crypto_free_hash(crypto->csums_tfm);
1919         crypto_free_hash(crypto->verify_tfm);
1920 }
1921
1922 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
1923 {
1924         enum drbd_ret_code retcode;
1925         struct drbd_tconn *tconn;
1926         struct net_conf *old_conf, *new_conf = NULL;
1927         int err;
1928         int ovr; /* online verify running */
1929         int rsr; /* re-sync running */
1930         struct crypto crypto = { };
1931
1932         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
1933         if (!adm_ctx.reply_skb)
1934                 return retcode;
1935         if (retcode != NO_ERROR)
1936                 goto out;
1937
1938         tconn = adm_ctx.tconn;
1939
1940         new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1941         if (!new_conf) {
1942                 retcode = ERR_NOMEM;
1943                 goto out;
1944         }
1945
1946         conn_reconfig_start(tconn);
1947
1948         mutex_lock(&tconn->data.mutex);
1949         mutex_lock(&tconn->conf_update);
1950         old_conf = tconn->net_conf;
1951
1952         if (!old_conf) {
1953                 drbd_msg_put_info("net conf missing, try connect");
1954                 retcode = ERR_INVALID_REQUEST;
1955                 goto fail;
1956         }
1957
1958         *new_conf = *old_conf;
1959         if (should_set_defaults(info))
1960                 set_net_conf_defaults(new_conf);
1961
1962         err = net_conf_from_attrs_for_change(new_conf, info);
1963         if (err && err != -ENOMSG) {
1964                 retcode = ERR_MANDATORY_TAG;
1965                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1966                 goto fail;
1967         }
1968
1969         retcode = check_net_options(tconn, new_conf);
1970         if (retcode != NO_ERROR)
1971                 goto fail;
1972
1973         /* re-sync running */
1974         rsr = conn_resync_running(tconn);
1975         if (rsr && strcmp(new_conf->csums_alg, old_conf->csums_alg)) {
1976                 retcode = ERR_CSUMS_RESYNC_RUNNING;
1977                 goto fail;
1978         }
1979
1980         /* online verify running */
1981         ovr = conn_ov_running(tconn);
1982         if (ovr && strcmp(new_conf->verify_alg, old_conf->verify_alg)) {
1983                 retcode = ERR_VERIFY_RUNNING;
1984                 goto fail;
1985         }
1986
1987         retcode = alloc_crypto(&crypto, new_conf);
1988         if (retcode != NO_ERROR)
1989                 goto fail;
1990
1991         rcu_assign_pointer(tconn->net_conf, new_conf);
1992
1993         if (!rsr) {
1994                 crypto_free_hash(tconn->csums_tfm);
1995                 tconn->csums_tfm = crypto.csums_tfm;
1996                 crypto.csums_tfm = NULL;
1997         }
1998         if (!ovr) {
1999                 crypto_free_hash(tconn->verify_tfm);
2000                 tconn->verify_tfm = crypto.verify_tfm;
2001                 crypto.verify_tfm = NULL;
2002         }
2003
2004         crypto_free_hash(tconn->integrity_tfm);
2005         tconn->integrity_tfm = crypto.integrity_tfm;
2006         if (tconn->cstate >= C_WF_REPORT_PARAMS && tconn->agreed_pro_version >= 100)
2007                 /* Do this without trying to take tconn->data.mutex again.  */
2008                 __drbd_send_protocol(tconn, P_PROTOCOL_UPDATE);
2009
2010         crypto_free_hash(tconn->cram_hmac_tfm);
2011         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2012
2013         mutex_unlock(&tconn->conf_update);
2014         mutex_unlock(&tconn->data.mutex);
2015         synchronize_rcu();
2016         kfree(old_conf);
2017
2018         if (tconn->cstate >= C_WF_REPORT_PARAMS)
2019                 drbd_send_sync_param(minor_to_mdev(conn_lowest_minor(tconn)));
2020
2021         goto done;
2022
2023  fail:
2024         mutex_unlock(&tconn->conf_update);
2025         mutex_unlock(&tconn->data.mutex);
2026         free_crypto(&crypto);
2027         kfree(new_conf);
2028  done:
2029         conn_reconfig_done(tconn);
2030  out:
2031         drbd_adm_finish(info, retcode);
2032         return 0;
2033 }
2034
2035 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
2036 {
2037         struct drbd_conf *mdev;
2038         struct net_conf *old_conf, *new_conf = NULL;
2039         struct crypto crypto = { };
2040         struct drbd_tconn *tconn;
2041         enum drbd_ret_code retcode;
2042         int i;
2043         int err;
2044
2045         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2046
2047         if (!adm_ctx.reply_skb)
2048                 return retcode;
2049         if (retcode != NO_ERROR)
2050                 goto out;
2051         if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
2052                 drbd_msg_put_info("connection endpoint(s) missing");
2053                 retcode = ERR_INVALID_REQUEST;
2054                 goto out;
2055         }
2056
2057         /* No need for _rcu here. All reconfiguration is
2058          * strictly serialized on genl_lock(). We are protected against
2059          * concurrent reconfiguration/addition/deletion */
2060         list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
2061                 if (nla_len(adm_ctx.my_addr) == tconn->my_addr_len &&
2062                     !memcmp(nla_data(adm_ctx.my_addr), &tconn->my_addr, tconn->my_addr_len)) {
2063                         retcode = ERR_LOCAL_ADDR;
2064                         goto out;
2065                 }
2066
2067                 if (nla_len(adm_ctx.peer_addr) == tconn->peer_addr_len &&
2068                     !memcmp(nla_data(adm_ctx.peer_addr), &tconn->peer_addr, tconn->peer_addr_len)) {
2069                         retcode = ERR_PEER_ADDR;
2070                         goto out;
2071                 }
2072         }
2073
2074         tconn = adm_ctx.tconn;
2075         conn_reconfig_start(tconn);
2076
2077         if (tconn->cstate > C_STANDALONE) {
2078                 retcode = ERR_NET_CONFIGURED;
2079                 goto fail;
2080         }
2081
2082         /* allocation not in the IO path, drbdsetup / netlink process context */
2083         new_conf = kzalloc(sizeof(*new_conf), GFP_KERNEL);
2084         if (!new_conf) {
2085                 retcode = ERR_NOMEM;
2086                 goto fail;
2087         }
2088
2089         set_net_conf_defaults(new_conf);
2090
2091         err = net_conf_from_attrs(new_conf, info);
2092         if (err && err != -ENOMSG) {
2093                 retcode = ERR_MANDATORY_TAG;
2094                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2095                 goto fail;
2096         }
2097
2098         retcode = check_net_options(tconn, new_conf);
2099         if (retcode != NO_ERROR)
2100                 goto fail;
2101
2102         retcode = alloc_crypto(&crypto, new_conf);
2103         if (retcode != NO_ERROR)
2104                 goto fail;
2105
2106         ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2107
2108         conn_flush_workqueue(tconn);
2109
2110         mutex_lock(&tconn->conf_update);
2111         old_conf = tconn->net_conf;
2112         if (old_conf) {
2113                 retcode = ERR_NET_CONFIGURED;
2114                 mutex_unlock(&tconn->conf_update);
2115                 goto fail;
2116         }
2117         rcu_assign_pointer(tconn->net_conf, new_conf);
2118
2119         conn_free_crypto(tconn);
2120         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2121         tconn->integrity_tfm = crypto.integrity_tfm;
2122         tconn->csums_tfm = crypto.csums_tfm;
2123         tconn->verify_tfm = crypto.verify_tfm;
2124
2125         tconn->my_addr_len = nla_len(adm_ctx.my_addr);
2126         memcpy(&tconn->my_addr, nla_data(adm_ctx.my_addr), tconn->my_addr_len);
2127         tconn->peer_addr_len = nla_len(adm_ctx.peer_addr);
2128         memcpy(&tconn->peer_addr, nla_data(adm_ctx.peer_addr), tconn->peer_addr_len);
2129
2130         mutex_unlock(&tconn->conf_update);
2131
2132         rcu_read_lock();
2133         idr_for_each_entry(&tconn->volumes, mdev, i) {
2134                 mdev->send_cnt = 0;
2135                 mdev->recv_cnt = 0;
2136         }
2137         rcu_read_unlock();
2138
2139         retcode = conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2140
2141         conn_reconfig_done(tconn);
2142         drbd_adm_finish(info, retcode);
2143         return 0;
2144
2145 fail:
2146         free_crypto(&crypto);
2147         kfree(new_conf);
2148
2149         conn_reconfig_done(tconn);
2150 out:
2151         drbd_adm_finish(info, retcode);
2152         return 0;
2153 }
2154
2155 static enum drbd_state_rv conn_try_disconnect(struct drbd_tconn *tconn, bool force)
2156 {
2157         enum drbd_state_rv rv;
2158
2159         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2160                         force ? CS_HARD : 0);
2161
2162         switch (rv) {
2163         case SS_NOTHING_TO_DO:
2164                 break;
2165         case SS_ALREADY_STANDALONE:
2166                 return SS_SUCCESS;
2167         case SS_PRIMARY_NOP:
2168                 /* Our state checking code wants to see the peer outdated. */
2169                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2170                                                 pdsk, D_OUTDATED), CS_VERBOSE);
2171                 break;
2172         case SS_CW_FAILED_BY_PEER:
2173                 /* The peer probably wants to see us outdated. */
2174                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2175                                                         disk, D_OUTDATED), 0);
2176                 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2177                         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2178                                         CS_HARD);
2179                 }
2180                 break;
2181         default:;
2182                 /* no special handling necessary */
2183         }
2184
2185         if (rv >= SS_SUCCESS) {
2186                 enum drbd_state_rv rv2;
2187                 /* No one else can reconfigure the network while I am here.
2188                  * The state handling only uses drbd_thread_stop_nowait(),
2189                  * we want to really wait here until the receiver is no more.
2190                  */
2191                 drbd_thread_stop(&adm_ctx.tconn->receiver);
2192
2193                 /* Race breaker.  This additional state change request may be
2194                  * necessary, if this was a forced disconnect during a receiver
2195                  * restart.  We may have "killed" the receiver thread just
2196                  * after drbdd_init() returned.  Typically, we should be
2197                  * C_STANDALONE already, now, and this becomes a no-op.
2198                  */
2199                 rv2 = conn_request_state(tconn, NS(conn, C_STANDALONE),
2200                                 CS_VERBOSE | CS_HARD);
2201                 if (rv2 < SS_SUCCESS)
2202                         conn_err(tconn,
2203                                 "unexpected rv2=%d in conn_try_disconnect()\n",
2204                                 rv2);
2205         }
2206         return rv;
2207 }
2208
2209 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2210 {
2211         struct disconnect_parms parms;
2212         struct drbd_tconn *tconn;
2213         enum drbd_state_rv rv;
2214         enum drbd_ret_code retcode;
2215         int err;
2216
2217         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
2218         if (!adm_ctx.reply_skb)
2219                 return retcode;
2220         if (retcode != NO_ERROR)
2221                 goto fail;
2222
2223         tconn = adm_ctx.tconn;
2224         memset(&parms, 0, sizeof(parms));
2225         if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2226                 err = disconnect_parms_from_attrs(&parms, info);
2227                 if (err) {
2228                         retcode = ERR_MANDATORY_TAG;
2229                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2230                         goto fail;
2231                 }
2232         }
2233
2234         rv = conn_try_disconnect(tconn, parms.force_disconnect);
2235         if (rv < SS_SUCCESS)
2236                 retcode = rv;  /* FIXME: Type mismatch. */
2237         else
2238                 retcode = NO_ERROR;
2239  fail:
2240         drbd_adm_finish(info, retcode);
2241         return 0;
2242 }
2243
2244 void resync_after_online_grow(struct drbd_conf *mdev)
2245 {
2246         int iass; /* I am sync source */
2247
2248         dev_info(DEV, "Resync of new storage after online grow\n");
2249         if (mdev->state.role != mdev->state.peer)
2250                 iass = (mdev->state.role == R_PRIMARY);
2251         else
2252                 iass = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags);
2253
2254         if (iass)
2255                 drbd_start_resync(mdev, C_SYNC_SOURCE);
2256         else
2257                 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2258 }
2259
2260 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2261 {
2262         struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
2263         struct resize_parms rs;
2264         struct drbd_conf *mdev;
2265         enum drbd_ret_code retcode;
2266         enum determine_dev_size dd;
2267         enum dds_flags ddsf;
2268         sector_t u_size;
2269         int err;
2270
2271         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2272         if (!adm_ctx.reply_skb)
2273                 return retcode;
2274         if (retcode != NO_ERROR)
2275                 goto fail;
2276
2277         memset(&rs, 0, sizeof(struct resize_parms));
2278         if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2279                 err = resize_parms_from_attrs(&rs, info);
2280                 if (err) {
2281                         retcode = ERR_MANDATORY_TAG;
2282                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2283                         goto fail;
2284                 }
2285         }
2286
2287         mdev = adm_ctx.mdev;
2288         if (mdev->state.conn > C_CONNECTED) {
2289                 retcode = ERR_RESIZE_RESYNC;
2290                 goto fail;
2291         }
2292
2293         if (mdev->state.role == R_SECONDARY &&
2294             mdev->state.peer == R_SECONDARY) {
2295                 retcode = ERR_NO_PRIMARY;
2296                 goto fail;
2297         }
2298
2299         if (!get_ldev(mdev)) {
2300                 retcode = ERR_NO_DISK;
2301                 goto fail;
2302         }
2303
2304         if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
2305                 retcode = ERR_NEED_APV_93;
2306                 goto fail_ldev;
2307         }
2308
2309         rcu_read_lock();
2310         u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
2311         rcu_read_unlock();
2312         if (u_size != (sector_t)rs.resize_size) {
2313                 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2314                 if (!new_disk_conf) {
2315                         retcode = ERR_NOMEM;
2316                         goto fail_ldev;
2317                 }
2318         }
2319
2320         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
2321                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
2322
2323         if (new_disk_conf) {
2324                 mutex_lock(&mdev->tconn->conf_update);
2325                 old_disk_conf = mdev->ldev->disk_conf;
2326                 *new_disk_conf = *old_disk_conf;
2327                 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2328                 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
2329                 mutex_unlock(&mdev->tconn->conf_update);
2330                 synchronize_rcu();
2331                 kfree(old_disk_conf);
2332         }
2333
2334         ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2335         dd = drbd_determine_dev_size(mdev, ddsf);
2336         drbd_md_sync(mdev);
2337         put_ldev(mdev);
2338         if (dd == dev_size_error) {
2339                 retcode = ERR_NOMEM_BITMAP;
2340                 goto fail;
2341         }
2342
2343         if (mdev->state.conn == C_CONNECTED) {
2344                 if (dd == grew)
2345                         set_bit(RESIZE_PENDING, &mdev->flags);
2346
2347                 drbd_send_uuids(mdev);
2348                 drbd_send_sizes(mdev, 1, ddsf);
2349         }
2350
2351  fail:
2352         drbd_adm_finish(info, retcode);
2353         return 0;
2354
2355  fail_ldev:
2356         put_ldev(mdev);
2357         goto fail;
2358 }
2359
2360 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2361 {
2362         enum drbd_ret_code retcode;
2363         struct drbd_tconn *tconn;
2364         struct res_opts res_opts;
2365         int err;
2366
2367         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2368         if (!adm_ctx.reply_skb)
2369                 return retcode;
2370         if (retcode != NO_ERROR)
2371                 goto fail;
2372         tconn = adm_ctx.tconn;
2373
2374         res_opts = tconn->res_opts;
2375         if (should_set_defaults(info))
2376                 set_res_opts_defaults(&res_opts);
2377
2378         err = res_opts_from_attrs(&res_opts, info);
2379         if (err && err != -ENOMSG) {
2380                 retcode = ERR_MANDATORY_TAG;
2381                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2382                 goto fail;
2383         }
2384
2385         err = set_resource_options(tconn, &res_opts);
2386         if (err) {
2387                 retcode = ERR_INVALID_REQUEST;
2388                 if (err == -ENOMEM)
2389                         retcode = ERR_NOMEM;
2390         }
2391
2392 fail:
2393         drbd_adm_finish(info, retcode);
2394         return 0;
2395 }
2396
2397 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2398 {
2399         struct drbd_conf *mdev;
2400         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2401
2402         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2403         if (!adm_ctx.reply_skb)
2404                 return retcode;
2405         if (retcode != NO_ERROR)
2406                 goto out;
2407
2408         mdev = adm_ctx.mdev;
2409
2410         /* If there is still bitmap IO pending, probably because of a previous
2411          * resync just being finished, wait for it before requesting a new resync.
2412          * Also wait for it's after_state_ch(). */
2413         drbd_suspend_io(mdev);
2414         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2415         drbd_flush_workqueue(mdev);
2416
2417         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
2418
2419         if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
2420                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2421
2422         while (retcode == SS_NEED_CONNECTION) {
2423                 spin_lock_irq(&mdev->tconn->req_lock);
2424                 if (mdev->state.conn < C_CONNECTED)
2425                         retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
2426                 spin_unlock_irq(&mdev->tconn->req_lock);
2427
2428                 if (retcode != SS_NEED_CONNECTION)
2429                         break;
2430
2431                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2432         }
2433         drbd_resume_io(mdev);
2434
2435 out:
2436         drbd_adm_finish(info, retcode);
2437         return 0;
2438 }
2439
2440 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2441                 union drbd_state mask, union drbd_state val)
2442 {
2443         enum drbd_ret_code retcode;
2444
2445         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2446         if (!adm_ctx.reply_skb)
2447                 return retcode;
2448         if (retcode != NO_ERROR)
2449                 goto out;
2450
2451         retcode = drbd_request_state(adm_ctx.mdev, mask, val);
2452 out:
2453         drbd_adm_finish(info, retcode);
2454         return 0;
2455 }
2456
2457 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
2458 {
2459         int rv;
2460
2461         rv = drbd_bmio_set_n_write(mdev);
2462         drbd_suspend_al(mdev);
2463         return rv;
2464 }
2465
2466 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
2467 {
2468         int retcode; /* drbd_ret_code, drbd_state_rv */
2469         struct drbd_conf *mdev;
2470
2471         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2472         if (!adm_ctx.reply_skb)
2473                 return retcode;
2474         if (retcode != NO_ERROR)
2475                 goto out;
2476
2477         mdev = adm_ctx.mdev;
2478
2479         /* If there is still bitmap IO pending, probably because of a previous
2480          * resync just being finished, wait for it before requesting a new resync.
2481          * Also wait for it's after_state_ch(). */
2482         drbd_suspend_io(mdev);
2483         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2484         drbd_flush_workqueue(mdev);
2485
2486         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
2487         if (retcode < SS_SUCCESS) {
2488                 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
2489                         /* The peer will get a resync upon connect anyways.
2490                          * Just make that into a full resync. */
2491                         retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
2492                         if (retcode >= SS_SUCCESS) {
2493                                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
2494                                                    "set_n_write from invalidate_peer",
2495                                                    BM_LOCKED_SET_ALLOWED))
2496                                         retcode = ERR_IO_MD_DISK;
2497                         }
2498                 } else
2499                         retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
2500         }
2501         drbd_resume_io(mdev);
2502
2503 out:
2504         drbd_adm_finish(info, retcode);
2505         return 0;
2506 }
2507
2508 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2509 {
2510         enum drbd_ret_code retcode;
2511
2512         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2513         if (!adm_ctx.reply_skb)
2514                 return retcode;
2515         if (retcode != NO_ERROR)
2516                 goto out;
2517
2518         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2519                 retcode = ERR_PAUSE_IS_SET;
2520 out:
2521         drbd_adm_finish(info, retcode);
2522         return 0;
2523 }
2524
2525 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
2526 {
2527         union drbd_dev_state s;
2528         enum drbd_ret_code retcode;
2529
2530         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2531         if (!adm_ctx.reply_skb)
2532                 return retcode;
2533         if (retcode != NO_ERROR)
2534                 goto out;
2535
2536         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2537                 s = adm_ctx.mdev->state;
2538                 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2539                         retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2540                                   s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2541                 } else {
2542                         retcode = ERR_PAUSE_IS_CLEAR;
2543                 }
2544         }
2545
2546 out:
2547         drbd_adm_finish(info, retcode);
2548         return 0;
2549 }
2550
2551 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
2552 {
2553         return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
2554 }
2555
2556 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
2557 {
2558         struct drbd_conf *mdev;
2559         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2560
2561         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2562         if (!adm_ctx.reply_skb)
2563                 return retcode;
2564         if (retcode != NO_ERROR)
2565                 goto out;
2566
2567         mdev = adm_ctx.mdev;
2568         if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2569                 drbd_uuid_new_current(mdev);
2570                 clear_bit(NEW_CUR_UUID, &mdev->flags);
2571         }
2572         drbd_suspend_io(mdev);
2573         retcode = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2574         if (retcode == SS_SUCCESS) {
2575                 if (mdev->state.conn < C_CONNECTED)
2576                         tl_clear(mdev->tconn);
2577                 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2578                         tl_restart(mdev->tconn, FAIL_FROZEN_DISK_IO);
2579         }
2580         drbd_resume_io(mdev);
2581
2582 out:
2583         drbd_adm_finish(info, retcode);
2584         return 0;
2585 }
2586
2587 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
2588 {
2589         return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
2590 }
2591
2592 int nla_put_drbd_cfg_context(struct sk_buff *skb, struct drbd_tconn *tconn, unsigned vnr)
2593 {
2594         struct nlattr *nla;
2595         nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2596         if (!nla)
2597                 goto nla_put_failure;
2598         if (vnr != VOLUME_UNSPECIFIED &&
2599             nla_put_u32(skb, T_ctx_volume, vnr))
2600                 goto nla_put_failure;
2601         if (nla_put_string(skb, T_ctx_resource_name, tconn->name))
2602                 goto nla_put_failure;
2603         if (tconn->my_addr_len &&
2604             nla_put(skb, T_ctx_my_addr, tconn->my_addr_len, &tconn->my_addr))
2605                 goto nla_put_failure;
2606         if (tconn->peer_addr_len &&
2607             nla_put(skb, T_ctx_peer_addr, tconn->peer_addr_len, &tconn->peer_addr))
2608                 goto nla_put_failure;
2609         nla_nest_end(skb, nla);
2610         return 0;
2611
2612 nla_put_failure:
2613         if (nla)
2614                 nla_nest_cancel(skb, nla);
2615         return -EMSGSIZE;
2616 }
2617
2618 int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
2619                 const struct sib_info *sib)
2620 {
2621         struct state_info *si = NULL; /* for sizeof(si->member); */
2622         struct net_conf *nc;
2623         struct nlattr *nla;
2624         int got_ldev;
2625         int err = 0;
2626         int exclude_sensitive;
2627
2628         /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2629          * to.  So we better exclude_sensitive information.
2630          *
2631          * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2632          * in the context of the requesting user process. Exclude sensitive
2633          * information, unless current has superuser.
2634          *
2635          * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2636          * relies on the current implementation of netlink_dump(), which
2637          * executes the dump callback successively from netlink_recvmsg(),
2638          * always in the context of the receiving process */
2639         exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2640
2641         got_ldev = get_ldev(mdev);
2642
2643         /* We need to add connection name and volume number information still.
2644          * Minor number is in drbd_genlmsghdr. */
2645         if (nla_put_drbd_cfg_context(skb, mdev->tconn, mdev->vnr))
2646                 goto nla_put_failure;
2647
2648         if (res_opts_to_skb(skb, &mdev->tconn->res_opts, exclude_sensitive))
2649                 goto nla_put_failure;
2650
2651         rcu_read_lock();
2652         if (got_ldev)
2653                 if (disk_conf_to_skb(skb, rcu_dereference(mdev->ldev->disk_conf), exclude_sensitive))
2654                         goto nla_put_failure;
2655
2656         nc = rcu_dereference(mdev->tconn->net_conf);
2657         if (nc)
2658                 err = net_conf_to_skb(skb, nc, exclude_sensitive);
2659         rcu_read_unlock();
2660         if (err)
2661                 goto nla_put_failure;
2662
2663         nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2664         if (!nla)
2665                 goto nla_put_failure;
2666         if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
2667             nla_put_u32(skb, T_current_state, mdev->state.i) ||
2668             nla_put_u64(skb, T_ed_uuid, mdev->ed_uuid) ||
2669             nla_put_u64(skb, T_capacity, drbd_get_capacity(mdev->this_bdev)) ||
2670             nla_put_u64(skb, T_send_cnt, mdev->send_cnt) ||
2671             nla_put_u64(skb, T_recv_cnt, mdev->recv_cnt) ||
2672             nla_put_u64(skb, T_read_cnt, mdev->read_cnt) ||
2673             nla_put_u64(skb, T_writ_cnt, mdev->writ_cnt) ||
2674             nla_put_u64(skb, T_al_writ_cnt, mdev->al_writ_cnt) ||
2675             nla_put_u64(skb, T_bm_writ_cnt, mdev->bm_writ_cnt) ||
2676             nla_put_u32(skb, T_ap_bio_cnt, atomic_read(&mdev->ap_bio_cnt)) ||
2677             nla_put_u32(skb, T_ap_pending_cnt, atomic_read(&mdev->ap_pending_cnt)) ||
2678             nla_put_u32(skb, T_rs_pending_cnt, atomic_read(&mdev->rs_pending_cnt)))
2679                 goto nla_put_failure;
2680
2681         if (got_ldev) {
2682                 if (nla_put_u32(skb, T_disk_flags, mdev->ldev->md.flags) ||
2683                     nla_put(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid) ||
2684                     nla_put_u64(skb, T_bits_total, drbd_bm_bits(mdev)) ||
2685                     nla_put_u64(skb, T_bits_oos, drbd_bm_total_weight(mdev)))
2686                         goto nla_put_failure;
2687                 if (C_SYNC_SOURCE <= mdev->state.conn &&
2688                     C_PAUSED_SYNC_T >= mdev->state.conn) {
2689                         if (nla_put_u64(skb, T_bits_rs_total, mdev->rs_total) ||
2690                             nla_put_u64(skb, T_bits_rs_failed, mdev->rs_failed))
2691                                 goto nla_put_failure;
2692                 }
2693         }
2694
2695         if (sib) {
2696                 switch(sib->sib_reason) {
2697                 case SIB_SYNC_PROGRESS:
2698                 case SIB_GET_STATUS_REPLY:
2699                         break;
2700                 case SIB_STATE_CHANGE:
2701                         if (nla_put_u32(skb, T_prev_state, sib->os.i) ||
2702                             nla_put_u32(skb, T_new_state, sib->ns.i))
2703                                 goto nla_put_failure;
2704                         break;
2705                 case SIB_HELPER_POST:
2706                         if (nla_put_u32(skb, T_helper_exit_code,
2707                                         sib->helper_exit_code))
2708                                 goto nla_put_failure;
2709                         /* fall through */
2710                 case SIB_HELPER_PRE:
2711                         if (nla_put_string(skb, T_helper, sib->helper_name))
2712                                 goto nla_put_failure;
2713                         break;
2714                 }
2715         }
2716         nla_nest_end(skb, nla);
2717
2718         if (0)
2719 nla_put_failure:
2720                 err = -EMSGSIZE;
2721         if (got_ldev)
2722                 put_ldev(mdev);
2723         return err;
2724 }
2725
2726 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
2727 {
2728         enum drbd_ret_code retcode;
2729         int err;
2730
2731         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2732         if (!adm_ctx.reply_skb)
2733                 return retcode;
2734         if (retcode != NO_ERROR)
2735                 goto out;
2736
2737         err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.mdev, NULL);
2738         if (err) {
2739                 nlmsg_free(adm_ctx.reply_skb);
2740                 return err;
2741         }
2742 out:
2743         drbd_adm_finish(info, retcode);
2744         return 0;
2745 }
2746
2747 int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
2748 {
2749         struct drbd_conf *mdev;
2750         struct drbd_genlmsghdr *dh;
2751         struct drbd_tconn *pos = (struct drbd_tconn*)cb->args[0];
2752         struct drbd_tconn *tconn = NULL;
2753         struct drbd_tconn *tmp;
2754         unsigned volume = cb->args[1];
2755
2756         /* Open coded, deferred, iteration:
2757          * list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
2758          *      idr_for_each_entry(&tconn->volumes, mdev, i) {
2759          *        ...
2760          *      }
2761          * }
2762          * where tconn is cb->args[0];
2763          * and i is cb->args[1];
2764          *
2765          * cb->args[2] indicates if we shall loop over all resources,
2766          * or just dump all volumes of a single resource.
2767          *
2768          * This may miss entries inserted after this dump started,
2769          * or entries deleted before they are reached.
2770          *
2771          * We need to make sure the mdev won't disappear while
2772          * we are looking at it, and revalidate our iterators
2773          * on each iteration.
2774          */
2775
2776         /* synchronize with conn_create()/conn_destroy() */
2777         rcu_read_lock();
2778         /* revalidate iterator position */
2779         list_for_each_entry_rcu(tmp, &drbd_tconns, all_tconn) {
2780                 if (pos == NULL) {
2781                         /* first iteration */
2782                         pos = tmp;
2783                         tconn = pos;
2784                         break;
2785                 }
2786                 if (tmp == pos) {
2787                         tconn = pos;
2788                         break;
2789                 }
2790         }
2791         if (tconn) {
2792 next_tconn:
2793                 mdev = idr_get_next(&tconn->volumes, &volume);
2794                 if (!mdev) {
2795                         /* No more volumes to dump on this tconn.
2796                          * Advance tconn iterator. */
2797                         pos = list_entry_rcu(tconn->all_tconn.next,
2798                                              struct drbd_tconn, all_tconn);
2799                         /* Did we dump any volume on this tconn yet? */
2800                         if (volume != 0) {
2801                                 /* If we reached the end of the list,
2802                                  * or only a single resource dump was requested,
2803                                  * we are done. */
2804                                 if (&pos->all_tconn == &drbd_tconns || cb->args[2])
2805                                         goto out;
2806                                 volume = 0;
2807                                 tconn = pos;
2808                                 goto next_tconn;
2809                         }
2810                 }
2811
2812                 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).pid,
2813                                 cb->nlh->nlmsg_seq, &drbd_genl_family,
2814                                 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
2815                 if (!dh)
2816                         goto out;
2817
2818                 if (!mdev) {
2819                         /* This is a tconn without a single volume.
2820                          * Suprisingly enough, it may have a network
2821                          * configuration. */
2822                         struct net_conf *nc;
2823                         dh->minor = -1U;
2824                         dh->ret_code = NO_ERROR;
2825                         if (nla_put_drbd_cfg_context(skb, tconn, VOLUME_UNSPECIFIED))
2826                                 goto cancel;
2827                         nc = rcu_dereference(tconn->net_conf);
2828                         if (nc && net_conf_to_skb(skb, nc, 1) != 0)
2829                                 goto cancel;
2830                         goto done;
2831                 }
2832
2833                 D_ASSERT(mdev->vnr == volume);
2834                 D_ASSERT(mdev->tconn == tconn);
2835
2836                 dh->minor = mdev_to_minor(mdev);
2837                 dh->ret_code = NO_ERROR;
2838
2839                 if (nla_put_status_info(skb, mdev, NULL)) {
2840 cancel:
2841                         genlmsg_cancel(skb, dh);
2842                         goto out;
2843                 }
2844 done:
2845                 genlmsg_end(skb, dh);
2846         }
2847
2848 out:
2849         rcu_read_unlock();
2850         /* where to start the next iteration */
2851         cb->args[0] = (long)pos;
2852         cb->args[1] = (pos == tconn) ? volume + 1 : 0;
2853
2854         /* No more tconns/volumes/minors found results in an empty skb.
2855          * Which will terminate the dump. */
2856         return skb->len;
2857 }
2858
2859 /*
2860  * Request status of all resources, or of all volumes within a single resource.
2861  *
2862  * This is a dump, as the answer may not fit in a single reply skb otherwise.
2863  * Which means we cannot use the family->attrbuf or other such members, because
2864  * dump is NOT protected by the genl_lock().  During dump, we only have access
2865  * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
2866  *
2867  * Once things are setup properly, we call into get_one_status().
2868  */
2869 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
2870 {
2871         const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
2872         struct nlattr *nla;
2873         const char *resource_name;
2874         struct drbd_tconn *tconn;
2875         int maxtype;
2876
2877         /* Is this a followup call? */
2878         if (cb->args[0]) {
2879                 /* ... of a single resource dump,
2880                  * and the resource iterator has been advanced already? */
2881                 if (cb->args[2] && cb->args[2] != cb->args[0])
2882                         return 0; /* DONE. */
2883                 goto dump;
2884         }
2885
2886         /* First call (from netlink_dump_start).  We need to figure out
2887          * which resource(s) the user wants us to dump. */
2888         nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
2889                         nlmsg_attrlen(cb->nlh, hdrlen),
2890                         DRBD_NLA_CFG_CONTEXT);
2891
2892         /* No explicit context given.  Dump all. */
2893         if (!nla)
2894                 goto dump;
2895         maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
2896         nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
2897         if (IS_ERR(nla))
2898                 return PTR_ERR(nla);
2899         /* context given, but no name present? */
2900         if (!nla)
2901                 return -EINVAL;
2902         resource_name = nla_data(nla);
2903         tconn = conn_get_by_name(resource_name);
2904
2905         if (!tconn)
2906                 return -ENODEV;
2907
2908         kref_put(&tconn->kref, &conn_destroy); /* get_one_status() (re)validates tconn by itself */
2909
2910         /* prime iterators, and set "filter" mode mark:
2911          * only dump this tconn. */
2912         cb->args[0] = (long)tconn;
2913         /* cb->args[1] = 0; passed in this way. */
2914         cb->args[2] = (long)tconn;
2915
2916 dump:
2917         return get_one_status(skb, cb);
2918 }
2919
2920 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
2921 {
2922         enum drbd_ret_code retcode;
2923         struct timeout_parms tp;
2924         int err;
2925
2926         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2927         if (!adm_ctx.reply_skb)
2928                 return retcode;
2929         if (retcode != NO_ERROR)
2930                 goto out;
2931
2932         tp.timeout_type =
2933                 adm_ctx.mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2934                 test_bit(USE_DEGR_WFC_T, &adm_ctx.mdev->flags) ? UT_DEGRADED :
2935                 UT_DEFAULT;
2936
2937         err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
2938         if (err) {
2939                 nlmsg_free(adm_ctx.reply_skb);
2940                 return err;
2941         }
2942 out:
2943         drbd_adm_finish(info, retcode);
2944         return 0;
2945 }
2946
2947 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
2948 {
2949         struct drbd_conf *mdev;
2950         enum drbd_ret_code retcode;
2951         struct start_ov_parms parms;
2952
2953         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2954         if (!adm_ctx.reply_skb)
2955                 return retcode;
2956         if (retcode != NO_ERROR)
2957                 goto out;
2958
2959         mdev = adm_ctx.mdev;
2960
2961         /* resume from last known position, if possible */
2962         parms.ov_start_sector = mdev->ov_start_sector;
2963         parms.ov_stop_sector = ULLONG_MAX;
2964         if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
2965                 int err = start_ov_parms_from_attrs(&parms, info);
2966                 if (err) {
2967                         retcode = ERR_MANDATORY_TAG;
2968                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2969                         goto out;
2970                 }
2971         }
2972         /* w_make_ov_request expects position to be aligned */
2973         mdev->ov_start_sector = parms.ov_start_sector & ~(BM_SECT_PER_BIT-1);
2974         mdev->ov_stop_sector = parms.ov_stop_sector;
2975
2976         /* If there is still bitmap IO pending, e.g. previous resync or verify
2977          * just being finished, wait for it before requesting a new resync. */
2978         drbd_suspend_io(mdev);
2979         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2980         retcode = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2981         drbd_resume_io(mdev);
2982 out:
2983         drbd_adm_finish(info, retcode);
2984         return 0;
2985 }
2986
2987
2988 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
2989 {
2990         struct drbd_conf *mdev;
2991         enum drbd_ret_code retcode;
2992         int skip_initial_sync = 0;
2993         int err;
2994         struct new_c_uuid_parms args;
2995
2996         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2997         if (!adm_ctx.reply_skb)
2998                 return retcode;
2999         if (retcode != NO_ERROR)
3000                 goto out_nolock;
3001
3002         mdev = adm_ctx.mdev;
3003         memset(&args, 0, sizeof(args));
3004         if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
3005                 err = new_c_uuid_parms_from_attrs(&args, info);
3006                 if (err) {
3007                         retcode = ERR_MANDATORY_TAG;
3008                         drbd_msg_put_info(from_attrs_err_to_txt(err));
3009                         goto out_nolock;
3010                 }
3011         }
3012
3013         mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
3014
3015         if (!get_ldev(mdev)) {
3016                 retcode = ERR_NO_DISK;
3017                 goto out;
3018         }
3019
3020         /* this is "skip initial sync", assume to be clean */
3021         if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
3022             mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
3023                 dev_info(DEV, "Preparing to skip initial sync\n");
3024                 skip_initial_sync = 1;
3025         } else if (mdev->state.conn != C_STANDALONE) {
3026                 retcode = ERR_CONNECTED;
3027                 goto out_dec;
3028         }
3029
3030         drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
3031         drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
3032
3033         if (args.clear_bm) {
3034                 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
3035                         "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
3036                 if (err) {
3037                         dev_err(DEV, "Writing bitmap failed with %d\n",err);
3038                         retcode = ERR_IO_MD_DISK;
3039                 }
3040                 if (skip_initial_sync) {
3041                         drbd_send_uuids_skip_initial_sync(mdev);
3042                         _drbd_uuid_set(mdev, UI_BITMAP, 0);
3043                         drbd_print_uuids(mdev, "cleared bitmap UUID");
3044                         spin_lock_irq(&mdev->tconn->req_lock);
3045                         _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3046                                         CS_VERBOSE, NULL);
3047                         spin_unlock_irq(&mdev->tconn->req_lock);
3048                 }
3049         }
3050
3051         drbd_md_sync(mdev);
3052 out_dec:
3053         put_ldev(mdev);
3054 out:
3055         mutex_unlock(mdev->state_mutex);
3056 out_nolock:
3057         drbd_adm_finish(info, retcode);
3058         return 0;
3059 }
3060
3061 static enum drbd_ret_code
3062 drbd_check_resource_name(const char *name)
3063 {
3064         if (!name || !name[0]) {
3065                 drbd_msg_put_info("resource name missing");
3066                 return ERR_MANDATORY_TAG;
3067         }
3068         /* if we want to use these in sysfs/configfs/debugfs some day,
3069          * we must not allow slashes */
3070         if (strchr(name, '/')) {
3071                 drbd_msg_put_info("invalid resource name");
3072                 return ERR_INVALID_REQUEST;
3073         }
3074         return NO_ERROR;
3075 }
3076
3077 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
3078 {
3079         enum drbd_ret_code retcode;
3080         struct res_opts res_opts;
3081         int err;
3082
3083         retcode = drbd_adm_prepare(skb, info, 0);
3084         if (!adm_ctx.reply_skb)
3085                 return retcode;
3086         if (retcode != NO_ERROR)
3087                 goto out;
3088
3089         set_res_opts_defaults(&res_opts);
3090         err = res_opts_from_attrs(&res_opts, info);
3091         if (err && err != -ENOMSG) {
3092                 retcode = ERR_MANDATORY_TAG;
3093                 drbd_msg_put_info(from_attrs_err_to_txt(err));
3094                 goto out;
3095         }
3096
3097         retcode = drbd_check_resource_name(adm_ctx.resource_name);
3098         if (retcode != NO_ERROR)
3099                 goto out;
3100
3101         if (adm_ctx.tconn) {
3102                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
3103                         retcode = ERR_INVALID_REQUEST;
3104                         drbd_msg_put_info("resource exists");
3105                 }
3106                 /* else: still NO_ERROR */
3107                 goto out;
3108         }
3109
3110         if (!conn_create(adm_ctx.resource_name, &res_opts))
3111                 retcode = ERR_NOMEM;
3112 out:
3113         drbd_adm_finish(info, retcode);
3114         return 0;
3115 }
3116
3117 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info)
3118 {
3119         struct drbd_genlmsghdr *dh = info->userhdr;
3120         enum drbd_ret_code retcode;
3121
3122         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3123         if (!adm_ctx.reply_skb)
3124                 return retcode;
3125         if (retcode != NO_ERROR)
3126                 goto out;
3127
3128         if (dh->minor > MINORMASK) {
3129                 drbd_msg_put_info("requested minor out of range");
3130                 retcode = ERR_INVALID_REQUEST;
3131                 goto out;
3132         }
3133         if (adm_ctx.volume > DRBD_VOLUME_MAX) {
3134                 drbd_msg_put_info("requested volume id out of range");
3135                 retcode = ERR_INVALID_REQUEST;
3136                 goto out;
3137         }
3138
3139         /* drbd_adm_prepare made sure already
3140          * that mdev->tconn and mdev->vnr match the request. */
3141         if (adm_ctx.mdev) {
3142                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3143                         retcode = ERR_MINOR_EXISTS;
3144                 /* else: still NO_ERROR */
3145                 goto out;
3146         }
3147
3148         retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume);
3149 out:
3150         drbd_adm_finish(info, retcode);
3151         return 0;
3152 }
3153
3154 static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
3155 {
3156         if (mdev->state.disk == D_DISKLESS &&
3157             /* no need to be mdev->state.conn == C_STANDALONE &&
3158              * we may want to delete a minor from a live replication group.
3159              */
3160             mdev->state.role == R_SECONDARY) {
3161                 _drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS),
3162                                     CS_VERBOSE + CS_WAIT_COMPLETE);
3163                 idr_remove(&mdev->tconn->volumes, mdev->vnr);
3164                 idr_remove(&minors, mdev_to_minor(mdev));
3165                 del_gendisk(mdev->vdisk);
3166                 synchronize_rcu();
3167                 kref_put(&mdev->kref, &drbd_minor_destroy);
3168                 return NO_ERROR;
3169         } else
3170                 return ERR_MINOR_CONFIGURED;
3171 }
3172
3173 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info)
3174 {
3175         enum drbd_ret_code retcode;
3176
3177         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3178         if (!adm_ctx.reply_skb)
3179                 return retcode;
3180         if (retcode != NO_ERROR)
3181                 goto out;
3182
3183         retcode = adm_delete_minor(adm_ctx.mdev);
3184 out:
3185         drbd_adm_finish(info, retcode);
3186         return 0;
3187 }
3188
3189 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3190 {
3191         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
3192         struct drbd_conf *mdev;
3193         unsigned i;
3194
3195         retcode = drbd_adm_prepare(skb, info, 0);
3196         if (!adm_ctx.reply_skb)
3197                 return retcode;
3198         if (retcode != NO_ERROR)
3199                 goto out;
3200
3201         if (!adm_ctx.tconn) {
3202                 retcode = ERR_RES_NOT_KNOWN;
3203                 goto out;
3204         }
3205
3206         /* demote */
3207         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3208                 retcode = drbd_set_role(mdev, R_SECONDARY, 0);
3209                 if (retcode < SS_SUCCESS) {
3210                         drbd_msg_put_info("failed to demote");
3211                         goto out;
3212                 }
3213         }
3214
3215         retcode = conn_try_disconnect(adm_ctx.tconn, 0);
3216         if (retcode < SS_SUCCESS) {
3217                 drbd_msg_put_info("failed to disconnect");
3218                 goto out;
3219         }
3220
3221         /* detach */
3222         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3223                 retcode = adm_detach(mdev, 0);
3224                 if (retcode < SS_SUCCESS || retcode > NO_ERROR) {
3225                         drbd_msg_put_info("failed to detach");
3226                         goto out;
3227                 }
3228         }
3229
3230         /* If we reach this, all volumes (of this tconn) are Secondary,
3231          * Disconnected, Diskless, aka Unconfigured. Make sure all threads have
3232          * actually stopped, state handling only does drbd_thread_stop_nowait(). */
3233         drbd_thread_stop(&adm_ctx.tconn->worker);
3234
3235         /* Now, nothing can fail anymore */
3236
3237         /* delete volumes */
3238         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3239                 retcode = adm_delete_minor(mdev);
3240                 if (retcode != NO_ERROR) {
3241                         /* "can not happen" */
3242                         drbd_msg_put_info("failed to delete volume");
3243                         goto out;
3244                 }
3245         }
3246
3247         /* delete connection */
3248         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3249                 list_del_rcu(&adm_ctx.tconn->all_tconn);
3250                 synchronize_rcu();
3251                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3252
3253                 retcode = NO_ERROR;
3254         } else {
3255                 /* "can not happen" */
3256                 retcode = ERR_RES_IN_USE;
3257                 drbd_msg_put_info("failed to delete connection");
3258         }
3259         goto out;
3260 out:
3261         drbd_adm_finish(info, retcode);
3262         return 0;
3263 }
3264
3265 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
3266 {
3267         enum drbd_ret_code retcode;
3268
3269         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3270         if (!adm_ctx.reply_skb)
3271                 return retcode;
3272         if (retcode != NO_ERROR)
3273                 goto out;
3274
3275         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3276                 list_del_rcu(&adm_ctx.tconn->all_tconn);
3277                 synchronize_rcu();
3278                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3279
3280                 retcode = NO_ERROR;
3281         } else {
3282                 retcode = ERR_RES_IN_USE;
3283         }
3284
3285         if (retcode == NO_ERROR)
3286                 drbd_thread_stop(&adm_ctx.tconn->worker);
3287 out:
3288         drbd_adm_finish(info, retcode);
3289         return 0;
3290 }
3291
3292 void drbd_bcast_event(struct drbd_conf *mdev, const struct sib_info *sib)
3293 {
3294         static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3295         struct sk_buff *msg;
3296         struct drbd_genlmsghdr *d_out;
3297         unsigned seq;
3298         int err = -ENOMEM;
3299
3300         seq = atomic_inc_return(&drbd_genl_seq);
3301         msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3302         if (!msg)
3303                 goto failed;
3304
3305         err = -EMSGSIZE;
3306         d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3307         if (!d_out) /* cannot happen, but anyways. */
3308                 goto nla_put_failure;
3309         d_out->minor = mdev_to_minor(mdev);
3310         d_out->ret_code = NO_ERROR;
3311
3312         if (nla_put_status_info(msg, mdev, sib))
3313                 goto nla_put_failure;
3314         genlmsg_end(msg, d_out);
3315         err = drbd_genl_multicast_events(msg, 0);
3316         /* msg has been consumed or freed in netlink_broadcast() */
3317         if (err && err != -ESRCH)
3318                 goto failed;
3319
3320         return;
3321
3322 nla_put_failure:
3323         nlmsg_free(msg);
3324 failed:
3325         dev_err(DEV, "Error %d while broadcasting event. "
3326                         "Event seq:%u sib_reason:%u\n",
3327                         err, seq, sib->sib_reason);
3328 }