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 && !capable(CAP_NET_ADMIN))
 159                return -EPERM;
 160
 161         adm_ctx.reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 162         if (!adm_ctx.reply_skb) {
 163                 err = -ENOMEM;
 164                 goto fail;
 165         }
 166
 167         adm_ctx.reply_dh = genlmsg_put_reply(adm_ctx.reply_skb,
 168                                         info, &drbd_genl_family, 0, cmd);
 169         /* put of a few bytes into a fresh skb of >= 4k will always succeed.
 170          * but anyways */
 171         if (!adm_ctx.reply_dh) {
 172                 err = -ENOMEM;
 173                 goto fail;
 174         }
 175
 176         adm_ctx.reply_dh->minor = d_in->minor;
 177         adm_ctx.reply_dh->ret_code = NO_ERROR;
 178
 179         adm_ctx.volume = VOLUME_UNSPECIFIED;
 180         if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
 181                 struct nlattr *nla;
 182                 /* parse and validate only */
 183                 err = drbd_cfg_context_from_attrs(NULL, info);
 184                 if (err)
 185                         goto fail;
 186
 187                 /* It was present, and valid,
 188                  * copy it over to the reply skb. */
 189                 err = nla_put_nohdr(adm_ctx.reply_skb,
 190                                 info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
 191                                 info->attrs[DRBD_NLA_CFG_CONTEXT]);
 192                 if (err)
 193                         goto fail;
 194
 195                 /* and assign stuff to the global adm_ctx */
 196                 nla = nested_attr_tb[__nla_type(T_ctx_volume)];
 197                 if (nla)
 198                         adm_ctx.volume = nla_get_u32(nla);
 199                 nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
 200                 if (nla)
 201                         adm_ctx.resource_name = nla_data(nla);
 202                 adm_ctx.my_addr = nested_attr_tb[__nla_type(T_ctx_my_addr)];
 203                 adm_ctx.peer_addr = nested_attr_tb[__nla_type(T_ctx_peer_addr)];
 204                 if ((adm_ctx.my_addr &&
 205                      nla_len(adm_ctx.my_addr) > sizeof(adm_ctx.tconn->my_addr)) ||
 206                     (adm_ctx.peer_addr &&
 207                      nla_len(adm_ctx.peer_addr) > sizeof(adm_ctx.tconn->peer_addr))) {
 208                         err = -EINVAL;
 209                         goto fail;
 210                 }
 211         }
 212
 213         adm_ctx.minor = d_in->minor;
 214         adm_ctx.mdev = minor_to_mdev(d_in->minor);
 215         adm_ctx.tconn = conn_get_by_name(adm_ctx.resource_name);
 216
 217         if (!adm_ctx.mdev && (flags & DRBD_ADM_NEED_MINOR)) {
 218                 drbd_msg_put_info("unknown minor");
 219                 return ERR_MINOR_INVALID;
 220         }
 221         if (!adm_ctx.tconn && (flags & DRBD_ADM_NEED_RESOURCE)) {
 222                 drbd_msg_put_info("unknown resource");
 223                 return ERR_INVALID_REQUEST;
 224         }
 225
 226         if (flags & DRBD_ADM_NEED_CONNECTION) {
 227                 if (adm_ctx.tconn && !(flags & DRBD_ADM_NEED_RESOURCE)) {
 228                         drbd_msg_put_info("no resource name expected");
 229                         return ERR_INVALID_REQUEST;
 230                 }
 231                 if (adm_ctx.mdev) {
 232                         drbd_msg_put_info("no minor number expected");
 233                         return ERR_INVALID_REQUEST;
 234                 }
 235                 if (adm_ctx.my_addr && adm_ctx.peer_addr)
 236                         adm_ctx.tconn = conn_get_by_addrs(nla_data(adm_ctx.my_addr),
 237                                                           nla_len(adm_ctx.my_addr),
 238                                                           nla_data(adm_ctx.peer_addr),
 239                                                           nla_len(adm_ctx.peer_addr));
 240                 if (!adm_ctx.tconn) {
 241                         drbd_msg_put_info("unknown connection");
 242                         return ERR_INVALID_REQUEST;
 243                 }
 244         }
 245
 246         /* some more paranoia, if the request was over-determined */
 247         if (adm_ctx.mdev && adm_ctx.tconn &&
 248             adm_ctx.mdev->tconn != adm_ctx.tconn) {
 249                 pr_warning("request: minor=%u, resource=%s; but that minor belongs to connection %s\n",
 250                                 adm_ctx.minor, adm_ctx.resource_name,
 251                                 adm_ctx.mdev->tconn->name);
 252                 drbd_msg_put_info("minor exists in different resource");
 253                 return ERR_INVALID_REQUEST;
 254         }
 255         if (adm_ctx.mdev &&
 256             adm_ctx.volume != VOLUME_UNSPECIFIED &&
 257             adm_ctx.volume != adm_ctx.mdev->vnr) {
 258                 pr_warning("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
 259                                 adm_ctx.minor, adm_ctx.volume,
 260                                 adm_ctx.mdev->vnr, adm_ctx.mdev->tconn->name);
 261                 drbd_msg_put_info("minor exists as different volume");
 262                 return ERR_INVALID_REQUEST;
 263         }
 264
 265         return NO_ERROR;
 266
 267 fail:
 268         nlmsg_free(adm_ctx.reply_skb);
 269         adm_ctx.reply_skb = NULL;
 270         return err;
 271 }
 272
 273 static int drbd_adm_finish(struct genl_info *info, int retcode)
 274 {
 275         if (adm_ctx.tconn) {
 276                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
 277                 adm_ctx.tconn = NULL;
 278         }
 279
 280         if (!adm_ctx.reply_skb)
 281                 return -ENOMEM;
 282
 283         adm_ctx.reply_dh->ret_code = retcode;
 284         drbd_adm_send_reply(adm_ctx.reply_skb, info);
 285         return 0;
 286 }
 287
 288 static void setup_khelper_env(struct drbd_tconn *tconn, char **envp)
 289 {
 290         char *afs;
 291
 292         /* FIXME: A future version will not allow this case. */
 293         if (tconn->my_addr_len == 0 || tconn->peer_addr_len == 0)
 294                 return;
 295
 296         switch (((struct sockaddr *)&tconn->peer_addr)->sa_family) {
 297         case AF_INET6:
 298                 afs = "ipv6";
 299                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
 300                          &((struct sockaddr_in6 *)&tconn->peer_addr)->sin6_addr);
 301                 break;
 302         case AF_INET:
 303                 afs = "ipv4";
 304                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 305                          &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
 306                 break;
 307         default:
 308                 afs = "ssocks";
 309                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 310                          &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
 311         }
 312         snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
 313 }
 314
 315 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
 316 {
 317         char *envp[] = { "HOME=/",
 318                         "TERM=linux",
 319                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 320                          (char[20]) { }, /* address family */
 321                          (char[60]) { }, /* address */
 322                         NULL };
 323         char mb[12];
 324         char *argv[] = {usermode_helper, cmd, mb, NULL };
 325         struct drbd_tconn *tconn = mdev->tconn;
 326         struct sib_info sib;
 327         int ret;
 328
 329         if (current == tconn->worker.task)
 330                 set_bit(CALLBACK_PENDING, &tconn->flags);
 331
 332         snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
 333         setup_khelper_env(tconn, envp);
 334
 335         /* The helper may take some time.
 336          * write out any unsynced meta data changes now */
 337         drbd_md_sync(mdev);
 338
 339         dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
 340         sib.sib_reason = SIB_HELPER_PRE;
 341         sib.helper_name = cmd;
 342         drbd_bcast_event(mdev, &sib);
 343         ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
 344         if (ret)
 345                 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 346                                 usermode_helper, cmd, mb,
 347                                 (ret >> 8) & 0xff, ret);
 348         else
 349                 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 350                                 usermode_helper, cmd, mb,
 351                                 (ret >> 8) & 0xff, ret);
 352         sib.sib_reason = SIB_HELPER_POST;
 353         sib.helper_exit_code = ret;
 354         drbd_bcast_event(mdev, &sib);
 355
 356         if (current == tconn->worker.task)
 357                 clear_bit(CALLBACK_PENDING, &tconn->flags);
 358
 359         if (ret < 0) /* Ignore any ERRNOs we got. */
 360                 ret = 0;
 361
 362         return ret;
 363 }
 364
 365 int conn_khelper(struct drbd_tconn *tconn, char *cmd)
 366 {
 367         char *envp[] = { "HOME=/",
 368                         "TERM=linux",
 369                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 370                          (char[20]) { }, /* address family */
 371                          (char[60]) { }, /* address */
 372                         NULL };
 373         char *argv[] = {usermode_helper, cmd, tconn->name, NULL };
 374         int ret;
 375
 376         setup_khelper_env(tconn, envp);
 377         conn_md_sync(tconn);
 378
 379         conn_info(tconn, "helper command: %s %s %s\n", usermode_helper, cmd, tconn->name);
 380         /* TODO: conn_bcast_event() ?? */
 381
 382         ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
 383         if (ret)
 384                 conn_warn(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 385                           usermode_helper, cmd, tconn->name,
 386                           (ret >> 8) & 0xff, ret);
 387         else
 388                 conn_info(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 389                           usermode_helper, cmd, tconn->name,
 390                           (ret >> 8) & 0xff, ret);
 391         /* TODO: conn_bcast_event() ?? */
 392
 393         if (ret < 0) /* Ignore any ERRNOs we got. */
 394                 ret = 0;
 395
 396         return ret;
 397 }
 398
 399 static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
 400 {
 401         enum drbd_fencing_p fp = FP_NOT_AVAIL;
 402         struct drbd_conf *mdev;
 403         int vnr;
 404
 405         rcu_read_lock();
 406         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
 407                 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
 408                         fp = max_t(enum drbd_fencing_p, fp,
 409                                    rcu_dereference(mdev->ldev->disk_conf)->fencing);
 410                         put_ldev(mdev);
 411                 }
 412         }
 413         rcu_read_unlock();
 414
 415         return fp;
 416 }
 417
 418 bool conn_try_outdate_peer(struct drbd_tconn *tconn)
 419 {
 420         unsigned int connect_cnt;
 421         union drbd_state mask = { };
 422         union drbd_state val = { };
 423         enum drbd_fencing_p fp;
 424         char *ex_to_string;
 425         int r;
 426
 427         if (tconn->cstate >= C_WF_REPORT_PARAMS) {
 428                 conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");
 429                 return false;
 430         }
 431
 432         spin_lock_irq(&tconn->req_lock);
 433         connect_cnt = tconn->connect_cnt;
 434         spin_unlock_irq(&tconn->req_lock);
 435
 436         fp = highest_fencing_policy(tconn);
 437         switch (fp) {
 438         case FP_NOT_AVAIL:
 439                 conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");
 440                 goto out;
 441         case FP_DONT_CARE:
 442                 return true;
 443         default: ;
 444         }
 445
 446         r = conn_khelper(tconn, "fence-peer");
 447
 448         switch ((r>>8) & 0xff) {
 449         case 3: /* peer is inconsistent */
 450                 ex_to_string = "peer is inconsistent or worse";
 451                 mask.pdsk = D_MASK;
 452                 val.pdsk = D_INCONSISTENT;
 453                 break;
 454         case 4: /* peer got outdated, or was already outdated */
 455                 ex_to_string = "peer was fenced";
 456                 mask.pdsk = D_MASK;
 457                 val.pdsk = D_OUTDATED;
 458                 break;
 459         case 5: /* peer was down */
 460                 if (conn_highest_disk(tconn) == D_UP_TO_DATE) {
 461                         /* we will(have) create(d) a new UUID anyways... */
 462                         ex_to_string = "peer is unreachable, assumed to be dead";
 463                         mask.pdsk = D_MASK;
 464                         val.pdsk = D_OUTDATED;
 465                 } else {
 466                         ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
 467                 }
 468                 break;
 469         case 6: /* Peer is primary, voluntarily outdate myself.
 470                  * This is useful when an unconnected R_SECONDARY is asked to
 471                  * become R_PRIMARY, but finds the other peer being active. */
 472                 ex_to_string = "peer is active";
 473                 conn_warn(tconn, "Peer is primary, outdating myself.\n");
 474                 mask.disk = D_MASK;
 475                 val.disk = D_OUTDATED;
 476                 break;
 477         case 7:
 478                 if (fp != FP_STONITH)
 479                         conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");
 480                 ex_to_string = "peer was stonithed";
 481                 mask.pdsk = D_MASK;
 482                 val.pdsk = D_OUTDATED;
 483                 break;
 484         default:
 485                 /* The script is broken ... */
 486                 conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
 487                 return false; /* Eventually leave IO frozen */
 488         }
 489
 490         conn_info(tconn, "fence-peer helper returned %d (%s)\n",
 491                   (r>>8) & 0xff, ex_to_string);
 492
 493  out:
 494
 495         /* Not using
 496            conn_request_state(tconn, mask, val, CS_VERBOSE);
 497            here, because we might were able to re-establish the connection in the
 498            meantime. */
 499         spin_lock_irq(&tconn->req_lock);
 500         if (tconn->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &tconn->flags)) {
 501                 if (tconn->connect_cnt != connect_cnt)
 502                         /* In case the connection was established and droped
 503                            while the fence-peer handler was running, ignore it */
 504                         conn_info(tconn, "Ignoring fence-peer exit code\n");
 505                 else
 506                         _conn_request_state(tconn, mask, val, CS_VERBOSE);
 507         }
 508         spin_unlock_irq(&tconn->req_lock);
 509
 510         return conn_highest_pdsk(tconn) <= D_OUTDATED;
 511 }
 512
 513 static int _try_outdate_peer_async(void *data)
 514 {
 515         struct drbd_tconn *tconn = (struct drbd_tconn *)data;
 516
 517         conn_try_outdate_peer(tconn);
 518
 519         kref_put(&tconn->kref, &conn_destroy);
 520         return 0;
 521 }
 522
 523 void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
 524 {
 525         struct task_struct *opa;
 526
 527         kref_get(&tconn->kref);
 528         opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
 529         if (IS_ERR(opa)) {
 530                 conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
 531                 kref_put(&tconn->kref, &conn_destroy);
 532         }
 533 }
 534
 535 enum drbd_state_rv
 536 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
 537 {
 538         const int max_tries = 4;
 539         enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
 540         struct net_conf *nc;
 541         int try = 0;
 542         int forced = 0;
 543         union drbd_state mask, val;
 544
 545         if (new_role == R_PRIMARY)
 546                 request_ping(mdev->tconn); /* Detect a dead peer ASAP */
 547
 548         mutex_lock(mdev->state_mutex);
 549
 550         mask.i = 0; mask.role = R_MASK;
 551         val.i  = 0; val.role  = new_role;
 552
 553         while (try++ < max_tries) {
 554                 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
 555
 556                 /* in case we first succeeded to outdate,
 557                  * but now suddenly could establish a connection */
 558                 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
 559                         val.pdsk = 0;
 560                         mask.pdsk = 0;
 561                         continue;
 562                 }
 563
 564                 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
 565                     (mdev->state.disk < D_UP_TO_DATE &&
 566                      mdev->state.disk >= D_INCONSISTENT)) {
 567                         mask.disk = D_MASK;
 568                         val.disk  = D_UP_TO_DATE;
 569                         forced = 1;
 570                         continue;
 571                 }
 572
 573                 if (rv == SS_NO_UP_TO_DATE_DISK &&
 574                     mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
 575                         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 576
 577                         if (conn_try_outdate_peer(mdev->tconn)) {
 578                                 val.disk = D_UP_TO_DATE;
 579                                 mask.disk = D_MASK;
 580                         }
 581                         continue;
 582                 }
 583
 584                 if (rv == SS_NOTHING_TO_DO)
 585                         goto out;
 586                 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
 587                         if (!conn_try_outdate_peer(mdev->tconn) && force) {
 588                                 dev_warn(DEV, "Forced into split brain situation!\n");
 589                                 mask.pdsk = D_MASK;
 590                                 val.pdsk  = D_OUTDATED;
 591
 592                         }
 593                         continue;
 594                 }
 595                 if (rv == SS_TWO_PRIMARIES) {
 596                         /* Maybe the peer is detected as dead very soon...
 597                            retry at most once more in this case. */
 598                         int timeo;
 599                         rcu_read_lock();
 600                         nc = rcu_dereference(mdev->tconn->net_conf);
 601                         timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
 602                         rcu_read_unlock();
 603                         schedule_timeout_interruptible(timeo);
 604                         if (try < max_tries)
 605                                 try = max_tries - 1;
 606                         continue;
 607                 }
 608                 if (rv < SS_SUCCESS) {
 609                         rv = _drbd_request_state(mdev, mask, val,
 610                                                 CS_VERBOSE + CS_WAIT_COMPLETE);
 611                         if (rv < SS_SUCCESS)
 612                                 goto out;
 613                 }
 614                 break;
 615         }
 616
 617         if (rv < SS_SUCCESS)
 618                 goto out;
 619
 620         if (forced)
 621                 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
 622
 623         /* Wait until nothing is on the fly :) */
 624         wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
 625
 626         /* FIXME also wait for all pending P_BARRIER_ACK? */
 627
 628         if (new_role == R_SECONDARY) {
 629                 set_disk_ro(mdev->vdisk, true);
 630                 if (get_ldev(mdev)) {
 631                         mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
 632                         put_ldev(mdev);
 633                 }
 634         } else {
 635                 mutex_lock(&mdev->tconn->conf_update);
 636                 nc = mdev->tconn->net_conf;
 637                 if (nc)
 638                         nc->discard_my_data = 0; /* without copy; single bit op is atomic */
 639                 mutex_unlock(&mdev->tconn->conf_update);
 640
 641                 set_disk_ro(mdev->vdisk, false);
 642                 if (get_ldev(mdev)) {
 643                         if (((mdev->state.conn < C_CONNECTED ||
 644                                mdev->state.pdsk <= D_FAILED)
 645                               && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
 646                                 drbd_uuid_new_current(mdev);
 647
 648                         mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
 649                         put_ldev(mdev);
 650                 }
 651         }
 652
 653         /* writeout of activity log covered areas of the bitmap
 654          * to stable storage done in after state change already */
 655
 656         if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
 657                 /* if this was forced, we should consider sync */
 658                 if (forced)
 659                         drbd_send_uuids(mdev);
 660                 drbd_send_current_state(mdev);
 661         }
 662
 663         drbd_md_sync(mdev);
 664
 665         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
 666 out:
 667         mutex_unlock(mdev->state_mutex);
 668         return rv;
 669 }
 670
 671 static const char *from_attrs_err_to_txt(int err)
 672 {
 673         return  err == -ENOMSG ? "required attribute missing" :
 674                 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
 675                 err == -EEXIST ? "can not change invariant setting" :
 676                 "invalid attribute value";
 677 }
 678
 679 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
 680 {
 681         struct set_role_parms parms;
 682         int err;
 683         enum drbd_ret_code retcode;
 684
 685         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
 686         if (!adm_ctx.reply_skb)
 687                 return retcode;
 688         if (retcode != NO_ERROR)
 689                 goto out;
 690
 691         memset(&parms, 0, sizeof(parms));
 692         if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
 693                 err = set_role_parms_from_attrs(&parms, info);
 694                 if (err) {
 695                         retcode = ERR_MANDATORY_TAG;
 696                         drbd_msg_put_info(from_attrs_err_to_txt(err));
 697                         goto out;
 698                 }
 699         }
 700
 701         if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
 702                 retcode = drbd_set_role(adm_ctx.mdev, R_PRIMARY, parms.assume_uptodate);
 703         else
 704                 retcode = drbd_set_role(adm_ctx.mdev, R_SECONDARY, 0);
 705 out:
 706         drbd_adm_finish(info, retcode);
 707         return 0;
 708 }
 709
 710 /* Initializes the md.*_offset members, so we are able to find
 711  * the on disk meta data.
 712  *
 713  * We currently have two possible layouts:
 714  * external:
 715  *   |----------- md_size_sect ------------------|
 716  *   [ 4k superblock ][ activity log ][  Bitmap  ]
 717  *   | al_offset == 8 |
 718  *   | bm_offset = al_offset + X      |
 719  *  ==> bitmap sectors = md_size_sect - bm_offset
 720  *
 721  * internal:
 722  *            |----------- md_size_sect ------------------|
 723  * [data.....][  Bitmap  ][ activity log ][ 4k superblock ]
 724  *                        | al_offset < 0 |
 725  *            | bm_offset = al_offset - Y |
 726  *  ==> bitmap sectors = Y = al_offset - bm_offset
 727  *
 728  *  Activity log size used to be fixed 32kB,
 729  *  but is about to become configurable.
 730  */
 731 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
 732                                        struct drbd_backing_dev *bdev)
 733 {
 734         sector_t md_size_sect = 0;
 735         unsigned int al_size_sect = bdev->md.al_size_4k * 8;
 736
 737         bdev->md.md_offset = drbd_md_ss(bdev);
 738
 739         switch (bdev->md.meta_dev_idx) {
 740         default:
 741                 /* v07 style fixed size indexed meta data */
 742                 bdev->md.md_size_sect = MD_128MB_SECT;
 743                 bdev->md.al_offset = MD_4kB_SECT;
 744                 bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
 745                 break;
 746         case DRBD_MD_INDEX_FLEX_EXT:
 747                 /* just occupy the full device; unit: sectors */
 748                 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
 749                 bdev->md.al_offset = MD_4kB_SECT;
 750                 bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
 751                 break;
 752         case DRBD_MD_INDEX_INTERNAL:
 753         case DRBD_MD_INDEX_FLEX_INT:
 754                 /* al size is still fixed */
 755                 bdev->md.al_offset = -al_size_sect;
 756                 /* we need (slightly less than) ~ this much bitmap sectors: */
 757                 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
 758                 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
 759                 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
 760                 md_size_sect = ALIGN(md_size_sect, 8);
 761
 762                 /* plus the "drbd meta data super block",
 763                  * and the activity log; */
 764                 md_size_sect += MD_4kB_SECT + al_size_sect;
 765
 766                 bdev->md.md_size_sect = md_size_sect;
 767                 /* bitmap offset is adjusted by 'super' block size */
 768                 bdev->md.bm_offset   = -md_size_sect + MD_4kB_SECT;
 769                 break;
 770         }
 771 }
 772
 773 /* input size is expected to be in KB */
 774 char *ppsize(char *buf, unsigned long long size)
 775 {
 776         /* Needs 9 bytes at max including trailing NUL:
 777          * -1ULL ==> "16384 EB" */
 778         static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
 779         int base = 0;
 780         while (size >= 10000 && base < sizeof(units)-1) {
 781                 /* shift + round */
 782                 size = (size >> 10) + !!(size & (1<<9));
 783                 base++;
 784         }
 785         sprintf(buf, "%u %cB", (unsigned)size, units[base]);
 786
 787         return buf;
 788 }
 789
 790 /* there is still a theoretical deadlock when called from receiver
 791  * on an D_INCONSISTENT R_PRIMARY:
 792  *  remote READ does inc_ap_bio, receiver would need to receive answer
 793  *  packet from remote to dec_ap_bio again.
 794  *  receiver receive_sizes(), comes here,
 795  *  waits for ap_bio_cnt == 0. -> deadlock.
 796  * but this cannot happen, actually, because:
 797  *  R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
 798  *  (not connected, or bad/no disk on peer):
 799  *  see drbd_fail_request_early, ap_bio_cnt is zero.
 800  *  R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
 801  *  peer may not initiate a resize.
 802  */
 803 /* Note these are not to be confused with
 804  * drbd_adm_suspend_io/drbd_adm_resume_io,
 805  * which are (sub) state changes triggered by admin (drbdsetup),
 806  * and can be long lived.
 807  * This changes an mdev->flag, is triggered by drbd internals,
 808  * and should be short-lived. */
 809 void drbd_suspend_io(struct drbd_conf *mdev)
 810 {
 811         set_bit(SUSPEND_IO, &mdev->flags);
 812         if (drbd_suspended(mdev))
 813                 return;
 814         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
 815 }
 816
 817 void drbd_resume_io(struct drbd_conf *mdev)
 818 {
 819         clear_bit(SUSPEND_IO, &mdev->flags);
 820         wake_up(&mdev->misc_wait);
 821 }
 822
 823 /**
 824  * drbd_determine_dev_size() -  Sets the right device size obeying all constraints
 825  * @mdev:       DRBD device.
 826  *
 827  * Returns 0 on success, negative return values indicate errors.
 828  * You should call drbd_md_sync() after calling this function.
 829  */
 830 enum determine_dev_size
 831 drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags, struct resize_parms *rs) __must_hold(local)
 832 {
 833         sector_t prev_first_sect, prev_size; /* previous meta location */
 834         sector_t la_size_sect, u_size;
 835         struct drbd_md *md = &mdev->ldev->md;
 836         u32 prev_al_stripe_size_4k;
 837         u32 prev_al_stripes;
 838         sector_t size;
 839         char ppb[10];
 840         void *buffer;
 841
 842         int md_moved, la_size_changed;
 843         enum determine_dev_size rv = DS_UNCHANGED;
 844
 845         /* race:
 846          * application request passes inc_ap_bio,
 847          * but then cannot get an AL-reference.
 848          * this function later may wait on ap_bio_cnt == 0. -> deadlock.
 849          *
 850          * to avoid that:
 851          * Suspend IO right here.
 852          * still lock the act_log to not trigger ASSERTs there.
 853          */
 854         drbd_suspend_io(mdev);
 855         buffer = drbd_md_get_buffer(mdev); /* Lock meta-data IO */
 856         if (!buffer) {
 857                 drbd_resume_io(mdev);
 858                 return DS_ERROR;
 859         }
 860
 861         /* no wait necessary anymore, actually we could assert that */
 862         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
 863
 864         prev_first_sect = drbd_md_first_sector(mdev->ldev);
 865         prev_size = mdev->ldev->md.md_size_sect;
 866         la_size_sect = mdev->ldev->md.la_size_sect;
 867
 868         if (rs) {
 869                 /* rs is non NULL if we should change the AL layout only */
 870
 871                 prev_al_stripes = md->al_stripes;
 872                 prev_al_stripe_size_4k = md->al_stripe_size_4k;
 873
 874                 md->al_stripes = rs->al_stripes;
 875                 md->al_stripe_size_4k = rs->al_stripe_size / 4;
 876                 md->al_size_4k = (u64)rs->al_stripes * rs->al_stripe_size / 4;
 877         }
 878
 879         drbd_md_set_sector_offsets(mdev, mdev->ldev);
 880
 881         rcu_read_lock();
 882         u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
 883         rcu_read_unlock();
 884         size = drbd_new_dev_size(mdev, mdev->ldev, u_size, flags & DDSF_FORCED);
 885
 886         if (size < la_size_sect) {
 887                 if (rs && u_size == 0) {
 888                         /* Remove "rs &&" later. This check should always be active, but
 889                            right now the receiver expects the permissive behavior */
 890                         dev_warn(DEV, "Implicit shrink not allowed. "
 891                                  "Use --size=%llus for explicit shrink.\n",
 892                                  (unsigned long long)size);
 893                         rv = DS_ERROR_SHRINK;
 894                 }
 895                 if (u_size > size)
 896                         rv = DS_ERROR_SPACE_MD;
 897                 if (rv != DS_UNCHANGED)
 898                         goto err_out;
 899         }
 900
 901         if (drbd_get_capacity(mdev->this_bdev) != size ||
 902             drbd_bm_capacity(mdev) != size) {
 903                 int err;
 904                 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
 905                 if (unlikely(err)) {
 906                         /* currently there is only one error: ENOMEM! */
 907                         size = drbd_bm_capacity(mdev)>>1;
 908                         if (size == 0) {
 909                                 dev_err(DEV, "OUT OF MEMORY! "
 910                                     "Could not allocate bitmap!\n");
 911                         } else {
 912                                 dev_err(DEV, "BM resizing failed. "
 913                                     "Leaving size unchanged at size = %lu KB\n",
 914                                     (unsigned long)size);
 915                         }
 916                         rv = DS_ERROR;
 917                 }
 918                 /* racy, see comments above. */
 919                 drbd_set_my_capacity(mdev, size);
 920                 mdev->ldev->md.la_size_sect = size;
 921                 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
 922                      (unsigned long long)size>>1);
 923         }
 924         if (rv <= DS_ERROR)
 925                 goto err_out;
 926
 927         la_size_changed = (la_size_sect != mdev->ldev->md.la_size_sect);
 928
 929         md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
 930                 || prev_size       != mdev->ldev->md.md_size_sect;
 931
 932         if (la_size_changed || md_moved || rs) {
 933                 u32 prev_flags;
 934
 935                 drbd_al_shrink(mdev); /* All extents inactive. */
 936
 937                 prev_flags = md->flags;
 938                 md->flags &= ~MDF_PRIMARY_IND;
 939                 drbd_md_write(mdev, buffer);
 940
 941                 dev_info(DEV, "Writing the whole bitmap, %s\n",
 942                          la_size_changed && md_moved ? "size changed and md moved" :
 943                          la_size_changed ? "size changed" : "md moved");
 944                 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
 945                 drbd_bitmap_io(mdev, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
 946                                "size changed", BM_LOCKED_MASK);
 947                 drbd_initialize_al(mdev, buffer);
 948
 949                 md->flags = prev_flags;
 950                 drbd_md_write(mdev, buffer);
 951
 952                 if (rs)
 953                         dev_info(DEV, "Changed AL layout to al-stripes = %d, al-stripe-size-kB = %d\n",
 954                                  md->al_stripes, md->al_stripe_size_4k * 4);
 955         }
 956
 957         if (size > la_size_sect)
 958                 rv = DS_GREW;
 959         if (size < la_size_sect)
 960                 rv = DS_SHRUNK;
 961
 962         if (0) {
 963         err_out:
 964                 if (rs) {
 965                         md->al_stripes = prev_al_stripes;
 966                         md->al_stripe_size_4k = prev_al_stripe_size_4k;
 967                         md->al_size_4k = (u64)prev_al_stripes * prev_al_stripe_size_4k;
 968
 969                         drbd_md_set_sector_offsets(mdev, mdev->ldev);
 970                 }
 971         }
 972         lc_unlock(mdev->act_log);
 973         wake_up(&mdev->al_wait);
 974         drbd_md_put_buffer(mdev);
 975         drbd_resume_io(mdev);
 976
 977         return rv;
 978 }
 979
 980 sector_t
 981 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
 982                   sector_t u_size, int assume_peer_has_space)
 983 {
 984         sector_t p_size = mdev->p_size;   /* partner's disk size. */
 985         sector_t la_size_sect = bdev->md.la_size_sect; /* last agreed size. */
 986         sector_t m_size; /* my size */
 987         sector_t size = 0;
 988
 989         m_size = drbd_get_max_capacity(bdev);
 990
 991         if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
 992                 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
 993                 p_size = m_size;
 994         }
 995
 996         if (p_size && m_size) {
 997                 size = min_t(sector_t, p_size, m_size);
 998         } else {
 999                 if (la_size_sect) {
1000                         size = la_size_sect;
1001                         if (m_size && m_size < size)
1002                                 size = m_size;
1003                         if (p_size && p_size < size)
1004                                 size = p_size;
1005                 } else {
1006                         if (m_size)
1007                                 size = m_size;
1008                         if (p_size)
1009                                 size = p_size;
1010                 }
1011         }
1012
1013         if (size == 0)
1014                 dev_err(DEV, "Both nodes diskless!\n");
1015
1016         if (u_size) {
1017                 if (u_size > size)
1018                         dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
1019                             (unsigned long)u_size>>1, (unsigned long)size>>1);
1020                 else
1021                         size = u_size;
1022         }
1023
1024         return size;
1025 }
1026
1027 /**
1028  * drbd_check_al_size() - Ensures that the AL is of the right size
1029  * @mdev:       DRBD device.
1030  *
1031  * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
1032  * failed, and 0 on success. You should call drbd_md_sync() after you called
1033  * this function.
1034  */
1035 static int drbd_check_al_size(struct drbd_conf *mdev, struct disk_conf *dc)
1036 {
1037         struct lru_cache *n, *t;
1038         struct lc_element *e;
1039         unsigned int in_use;
1040         int i;
1041
1042         if (mdev->act_log &&
1043             mdev->act_log->nr_elements == dc->al_extents)
1044                 return 0;
1045
1046         in_use = 0;
1047         t = mdev->act_log;
1048         n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
1049                 dc->al_extents, sizeof(struct lc_element), 0);
1050
1051         if (n == NULL) {
1052                 dev_err(DEV, "Cannot allocate act_log lru!\n");
1053                 return -ENOMEM;
1054         }
1055         spin_lock_irq(&mdev->al_lock);
1056         if (t) {
1057                 for (i = 0; i < t->nr_elements; i++) {
1058                         e = lc_element_by_index(t, i);
1059                         if (e->refcnt)
1060                                 dev_err(DEV, "refcnt(%d)==%d\n",
1061                                     e->lc_number, e->refcnt);
1062                         in_use += e->refcnt;
1063                 }
1064         }
1065         if (!in_use)
1066                 mdev->act_log = n;
1067         spin_unlock_irq(&mdev->al_lock);
1068         if (in_use) {
1069                 dev_err(DEV, "Activity log still in use!\n");
1070                 lc_destroy(n);
1071                 return -EBUSY;
1072         } else {
1073                 if (t)
1074                         lc_destroy(t);
1075         }
1076         drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
1077         return 0;
1078 }
1079
1080 static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
1081 {
1082         struct request_queue * const q = mdev->rq_queue;
1083         unsigned int max_hw_sectors = max_bio_size >> 9;
1084         unsigned int max_segments = 0;
1085
1086         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1087                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1088
1089                 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
1090                 rcu_read_lock();
1091                 max_segments = rcu_dereference(mdev->ldev->disk_conf)->max_bio_bvecs;
1092                 rcu_read_unlock();
1093                 put_ldev(mdev);
1094         }
1095
1096         blk_queue_logical_block_size(q, 512);
1097         blk_queue_max_hw_sectors(q, max_hw_sectors);
1098         /* This is the workaround for "bio would need to, but cannot, be split" */
1099         blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1100         blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
1101
1102         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1103                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1104
1105                 blk_queue_stack_limits(q, b);
1106
1107                 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
1108                         dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
1109                                  q->backing_dev_info.ra_pages,
1110                                  b->backing_dev_info.ra_pages);
1111                         q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1112                 }
1113                 put_ldev(mdev);
1114         }
1115 }
1116
1117 void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
1118 {
1119         unsigned int now, new, local, peer;
1120
1121         now = queue_max_hw_sectors(mdev->rq_queue) << 9;
1122         local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
1123         peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
1124
1125         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1126                 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
1127                 mdev->local_max_bio_size = local;
1128                 put_ldev(mdev);
1129         }
1130         local = min(local, DRBD_MAX_BIO_SIZE);
1131
1132         /* We may ignore peer limits if the peer is modern enough.
1133            Because new from 8.3.8 onwards the peer can use multiple
1134            BIOs for a single peer_request */
1135         if (mdev->state.conn >= C_CONNECTED) {
1136                 if (mdev->tconn->agreed_pro_version < 94)
1137                         peer = min( mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
1138                         /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
1139                 else if (mdev->tconn->agreed_pro_version == 94)
1140                         peer = DRBD_MAX_SIZE_H80_PACKET;
1141                 else if (mdev->tconn->agreed_pro_version < 100)
1142                         peer = DRBD_MAX_BIO_SIZE_P95;  /* drbd 8.3.8 onwards, before 8.4.0 */
1143                 else
1144                         peer = DRBD_MAX_BIO_SIZE;
1145         }
1146
1147         new = min(local, peer);
1148
1149         if (mdev->state.role == R_PRIMARY && new < now)
1150                 dev_err(DEV, "ASSERT FAILED new < now; (%u < %u)\n", new, now);
1151
1152         if (new != now)
1153                 dev_info(DEV, "max BIO size = %u\n", new);
1154
1155         drbd_setup_queue_param(mdev, new);
1156 }
1157
1158 /* Starts the worker thread */
1159 static void conn_reconfig_start(struct drbd_tconn *tconn)
1160 {
1161         drbd_thread_start(&tconn->worker);
1162         conn_flush_workqueue(tconn);
1163 }
1164
1165 /* if still unconfigured, stops worker again. */
1166 static void conn_reconfig_done(struct drbd_tconn *tconn)
1167 {
1168         bool stop_threads;
1169         spin_lock_irq(&tconn->req_lock);
1170         stop_threads = conn_all_vols_unconf(tconn) &&
1171                 tconn->cstate == C_STANDALONE;
1172         spin_unlock_irq(&tconn->req_lock);
1173         if (stop_threads) {
1174                 /* asender is implicitly stopped by receiver
1175                  * in conn_disconnect() */
1176                 drbd_thread_stop(&tconn->receiver);
1177                 drbd_thread_stop(&tconn->worker);
1178         }
1179 }
1180
1181 /* Make sure IO is suspended before calling this function(). */
1182 static void drbd_suspend_al(struct drbd_conf *mdev)
1183 {
1184         int s = 0;
1185
1186         if (!lc_try_lock(mdev->act_log)) {
1187                 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
1188                 return;
1189         }
1190
1191         drbd_al_shrink(mdev);
1192         spin_lock_irq(&mdev->tconn->req_lock);
1193         if (mdev->state.conn < C_CONNECTED)
1194                 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
1195         spin_unlock_irq(&mdev->tconn->req_lock);
1196         lc_unlock(mdev->act_log);
1197
1198         if (s)
1199                 dev_info(DEV, "Suspended AL updates\n");
1200 }
1201
1202
1203 static bool should_set_defaults(struct genl_info *info)
1204 {
1205         unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1206         return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1207 }
1208
1209 static unsigned int drbd_al_extents_max(struct drbd_backing_dev *bdev)
1210 {
1211         /* This is limited by 16 bit "slot" numbers,
1212          * and by available on-disk context storage.
1213          *
1214          * Also (u16)~0 is special (denotes a "free" extent).
1215          *
1216          * One transaction occupies one 4kB on-disk block,
1217          * we have n such blocks in the on disk ring buffer,
1218          * the "current" transaction may fail (n-1),
1219          * and there is 919 slot numbers context information per transaction.
1220          *
1221          * 72 transaction blocks amounts to more than 2**16 context slots,
1222          * so cap there first.
1223          */
1224         const unsigned int max_al_nr = DRBD_AL_EXTENTS_MAX;
1225         const unsigned int sufficient_on_disk =
1226                 (max_al_nr + AL_CONTEXT_PER_TRANSACTION -1)
1227                 /AL_CONTEXT_PER_TRANSACTION;
1228
1229         unsigned int al_size_4k = bdev->md.al_size_4k;
1230
1231         if (al_size_4k > sufficient_on_disk)
1232                 return max_al_nr;
1233
1234         return (al_size_4k - 1) * AL_CONTEXT_PER_TRANSACTION;
1235 }
1236
1237 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1238 {
1239         enum drbd_ret_code retcode;
1240         struct drbd_conf *mdev;
1241         struct disk_conf *new_disk_conf, *old_disk_conf;
1242         struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
1243         int err, fifo_size;
1244
1245         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1246         if (!adm_ctx.reply_skb)
1247                 return retcode;
1248         if (retcode != NO_ERROR)
1249                 goto out;
1250
1251         mdev = adm_ctx.mdev;
1252
1253         /* we also need a disk
1254          * to change the options on */
1255         if (!get_ldev(mdev)) {
1256                 retcode = ERR_NO_DISK;
1257                 goto out;
1258         }
1259
1260         new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
1261         if (!new_disk_conf) {
1262                 retcode = ERR_NOMEM;
1263                 goto fail;
1264         }
1265
1266         mutex_lock(&mdev->tconn->conf_update);
1267         old_disk_conf = mdev->ldev->disk_conf;
1268         *new_disk_conf = *old_disk_conf;
1269         if (should_set_defaults(info))
1270                 set_disk_conf_defaults(new_disk_conf);
1271
1272         err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1273         if (err && err != -ENOMSG) {
1274                 retcode = ERR_MANDATORY_TAG;
1275                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1276         }
1277
1278         if (!expect(new_disk_conf->resync_rate >= 1))
1279                 new_disk_conf->resync_rate = 1;
1280
1281         if (new_disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
1282                 new_disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
1283         if (new_disk_conf->al_extents > drbd_al_extents_max(mdev->ldev))
1284                 new_disk_conf->al_extents = drbd_al_extents_max(mdev->ldev);
1285
1286         if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1287                 new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1288
1289         fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1290         if (fifo_size != mdev->rs_plan_s->size) {
1291                 new_plan = fifo_alloc(fifo_size);
1292                 if (!new_plan) {
1293                         dev_err(DEV, "kmalloc of fifo_buffer failed");
1294                         retcode = ERR_NOMEM;
1295                         goto fail_unlock;
1296                 }
1297         }
1298
1299         drbd_suspend_io(mdev);
1300         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1301         drbd_al_shrink(mdev);
1302         err = drbd_check_al_size(mdev, new_disk_conf);
1303         lc_unlock(mdev->act_log);
1304         wake_up(&mdev->al_wait);
1305         drbd_resume_io(mdev);
1306
1307         if (err) {
1308                 retcode = ERR_NOMEM;
1309                 goto fail_unlock;
1310         }
1311
1312         write_lock_irq(&global_state_lock);
1313         retcode = drbd_resync_after_valid(mdev, new_disk_conf->resync_after);
1314         if (retcode == NO_ERROR) {
1315                 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
1316                 drbd_resync_after_changed(mdev);
1317         }
1318         write_unlock_irq(&global_state_lock);
1319
1320         if (retcode != NO_ERROR)
1321                 goto fail_unlock;
1322
1323         if (new_plan) {
1324                 old_plan = mdev->rs_plan_s;
1325                 rcu_assign_pointer(mdev->rs_plan_s, new_plan);
1326         }
1327
1328         mutex_unlock(&mdev->tconn->conf_update);
1329
1330         if (new_disk_conf->al_updates)
1331                 mdev->ldev->md.flags &= ~MDF_AL_DISABLED;
1332         else
1333                 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1334
1335         if (new_disk_conf->md_flushes)
1336                 clear_bit(MD_NO_FUA, &mdev->flags);
1337         else
1338                 set_bit(MD_NO_FUA, &mdev->flags);
1339
1340         drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1341
1342         drbd_md_sync(mdev);
1343
1344         if (mdev->state.conn >= C_CONNECTED)
1345                 drbd_send_sync_param(mdev);
1346
1347         synchronize_rcu();
1348         kfree(old_disk_conf);
1349         kfree(old_plan);
1350         mod_timer(&mdev->request_timer, jiffies + HZ);
1351         goto success;
1352
1353 fail_unlock:
1354         mutex_unlock(&mdev->tconn->conf_update);
1355  fail:
1356         kfree(new_disk_conf);
1357         kfree(new_plan);
1358 success:
1359         put_ldev(mdev);
1360  out:
1361         drbd_adm_finish(info, retcode);
1362         return 0;
1363 }
1364
1365 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1366 {
1367         struct drbd_conf *mdev;
1368         int err;
1369         enum drbd_ret_code retcode;
1370         enum determine_dev_size dd;
1371         sector_t max_possible_sectors;
1372         sector_t min_md_device_sectors;
1373         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1374         struct disk_conf *new_disk_conf = NULL;
1375         struct block_device *bdev;
1376         struct lru_cache *resync_lru = NULL;
1377         struct fifo_buffer *new_plan = NULL;
1378         union drbd_state ns, os;
1379         enum drbd_state_rv rv;
1380         struct net_conf *nc;
1381
1382         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1383         if (!adm_ctx.reply_skb)
1384                 return retcode;
1385         if (retcode != NO_ERROR)
1386                 goto finish;
1387
1388         mdev = adm_ctx.mdev;
1389         conn_reconfig_start(mdev->tconn);
1390
1391         /* if you want to reconfigure, please tear down first */
1392         if (mdev->state.disk > D_DISKLESS) {
1393                 retcode = ERR_DISK_CONFIGURED;
1394                 goto fail;
1395         }
1396         /* It may just now have detached because of IO error.  Make sure
1397          * drbd_ldev_destroy is done already, we may end up here very fast,
1398          * e.g. if someone calls attach from the on-io-error handler,
1399          * to realize a "hot spare" feature (not that I'd recommend that) */
1400         wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1401
1402         /* make sure there is no leftover from previous force-detach attempts */
1403         clear_bit(FORCE_DETACH, &mdev->flags);
1404         clear_bit(WAS_IO_ERROR, &mdev->flags);
1405         clear_bit(WAS_READ_ERROR, &mdev->flags);
1406
1407         /* and no leftover from previously aborted resync or verify, either */
1408         mdev->rs_total = 0;
1409         mdev->rs_failed = 0;
1410         atomic_set(&mdev->rs_pending_cnt, 0);
1411
1412         /* allocation not in the IO path, drbdsetup context */
1413         nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1414         if (!nbc) {
1415                 retcode = ERR_NOMEM;
1416                 goto fail;
1417         }
1418         spin_lock_init(&nbc->md.uuid_lock);
1419
1420         new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1421         if (!new_disk_conf) {
1422                 retcode = ERR_NOMEM;
1423                 goto fail;
1424         }
1425         nbc->disk_conf = new_disk_conf;
1426
1427         set_disk_conf_defaults(new_disk_conf);
1428         err = disk_conf_from_attrs(new_disk_conf, info);
1429         if (err) {
1430                 retcode = ERR_MANDATORY_TAG;
1431                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1432                 goto fail;
1433         }
1434
1435         if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1436                 new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1437
1438         new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1439         if (!new_plan) {
1440                 retcode = ERR_NOMEM;
1441                 goto fail;
1442         }
1443
1444         if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1445                 retcode = ERR_MD_IDX_INVALID;
1446                 goto fail;
1447         }
1448
1449         write_lock_irq(&global_state_lock);
1450         retcode = drbd_resync_after_valid(mdev, new_disk_conf->resync_after);
1451         write_unlock_irq(&global_state_lock);
1452         if (retcode != NO_ERROR)
1453                 goto fail;
1454
1455         rcu_read_lock();
1456         nc = rcu_dereference(mdev->tconn->net_conf);
1457         if (nc) {
1458                 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1459                         rcu_read_unlock();
1460                         retcode = ERR_STONITH_AND_PROT_A;
1461                         goto fail;
1462                 }
1463         }
1464         rcu_read_unlock();
1465
1466         bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
1467                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
1468         if (IS_ERR(bdev)) {
1469                 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
1470                         PTR_ERR(bdev));
1471                 retcode = ERR_OPEN_DISK;
1472                 goto fail;
1473         }
1474         nbc->backing_bdev = bdev;
1475
1476         /*
1477          * meta_dev_idx >= 0: external fixed size, possibly multiple
1478          * drbd sharing one meta device.  TODO in that case, paranoia
1479          * check that [md_bdev, meta_dev_idx] is not yet used by some
1480          * other drbd minor!  (if you use drbd.conf + drbdadm, that
1481          * should check it for you already; but if you don't, or
1482          * someone fooled it, we need to double check here)
1483          */
1484         bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
1485                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1486                                   (new_disk_conf->meta_dev_idx < 0) ?
1487                                   (void *)mdev : (void *)drbd_m_holder);
1488         if (IS_ERR(bdev)) {
1489                 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
1490                         PTR_ERR(bdev));
1491                 retcode = ERR_OPEN_MD_DISK;
1492                 goto fail;
1493         }
1494         nbc->md_bdev = bdev;
1495
1496         if ((nbc->backing_bdev == nbc->md_bdev) !=
1497             (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1498              new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1499                 retcode = ERR_MD_IDX_INVALID;
1500                 goto fail;
1501         }
1502
1503         resync_lru = lc_create("resync", drbd_bm_ext_cache,
1504                         1, 61, sizeof(struct bm_extent),
1505                         offsetof(struct bm_extent, lce));
1506         if (!resync_lru) {
1507                 retcode = ERR_NOMEM;
1508                 goto fail;
1509         }
1510
1511         /* Read our meta data super block early.
1512          * This also sets other on-disk offsets. */
1513         retcode = drbd_md_read(mdev, nbc);
1514         if (retcode != NO_ERROR)
1515                 goto fail;
1516
1517         if (new_disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
1518                 new_disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
1519         if (new_disk_conf->al_extents > drbd_al_extents_max(nbc))
1520                 new_disk_conf->al_extents = drbd_al_extents_max(nbc);
1521
1522         if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
1523                 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1524                         (unsigned long long) drbd_get_max_capacity(nbc),
1525                         (unsigned long long) new_disk_conf->disk_size);
1526                 retcode = ERR_DISK_TOO_SMALL;
1527                 goto fail;
1528         }
1529
1530         if (new_disk_conf->meta_dev_idx < 0) {
1531                 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1532                 /* at least one MB, otherwise it does not make sense */
1533                 min_md_device_sectors = (2<<10);
1534         } else {
1535                 max_possible_sectors = DRBD_MAX_SECTORS;
1536                 min_md_device_sectors = MD_128MB_SECT * (new_disk_conf->meta_dev_idx + 1);
1537         }
1538
1539         if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1540                 retcode = ERR_MD_DISK_TOO_SMALL;
1541                 dev_warn(DEV, "refusing attach: md-device too small, "
1542                      "at least %llu sectors needed for this meta-disk type\n",
1543                      (unsigned long long) min_md_device_sectors);
1544                 goto fail;
1545         }
1546
1547         /* Make sure the new disk is big enough
1548          * (we may currently be R_PRIMARY with no local disk...) */
1549         if (drbd_get_max_capacity(nbc) <
1550             drbd_get_capacity(mdev->this_bdev)) {
1551                 retcode = ERR_DISK_TOO_SMALL;
1552                 goto fail;
1553         }
1554
1555         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1556
1557         if (nbc->known_size > max_possible_sectors) {
1558                 dev_warn(DEV, "==> truncating very big lower level device "
1559                         "to currently maximum possible %llu sectors <==\n",
1560                         (unsigned long long) max_possible_sectors);
1561                 if (new_disk_conf->meta_dev_idx >= 0)
1562                         dev_warn(DEV, "==>> using internal or flexible "
1563                                       "meta data may help <<==\n");
1564         }
1565
1566         drbd_suspend_io(mdev);
1567         /* also wait for the last barrier ack. */
1568         /* FIXME see also https://daiquiri.linbit/cgi-bin/bugzilla/show_bug.cgi?id=171
1569          * We need a way to either ignore barrier acks for barriers sent before a device
1570          * was attached, or a way to wait for all pending barrier acks to come in.
1571          * As barriers are counted per resource,
1572          * we'd need to suspend io on all devices of a resource.
1573          */
1574         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || drbd_suspended(mdev));
1575         /* and for any other previously queued work */
1576         drbd_flush_workqueue(mdev);
1577
1578         rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1579         retcode = rv;  /* FIXME: Type mismatch. */
1580         drbd_resume_io(mdev);
1581         if (rv < SS_SUCCESS)
1582                 goto fail;
1583
1584         if (!get_ldev_if_state(mdev, D_ATTACHING))
1585                 goto force_diskless;
1586
1587         if (!mdev->bitmap) {
1588                 if (drbd_bm_init(mdev)) {
1589                         retcode = ERR_NOMEM;
1590                         goto force_diskless_dec;
1591                 }
1592         }
1593
1594         if (mdev->state.conn < C_CONNECTED &&
1595             mdev->state.role == R_PRIMARY &&
1596             (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1597                 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1598                     (unsigned long long)mdev->ed_uuid);
1599                 retcode = ERR_DATA_NOT_CURRENT;
1600                 goto force_diskless_dec;
1601         }
1602
1603         /* Since we are diskless, fix the activity log first... */
1604         if (drbd_check_al_size(mdev, new_disk_conf)) {
1605                 retcode = ERR_NOMEM;
1606                 goto force_diskless_dec;
1607         }
1608
1609         /* Prevent shrinking of consistent devices ! */
1610         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1611             drbd_new_dev_size(mdev, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
1612                 dev_warn(DEV, "refusing to truncate a consistent device\n");
1613                 retcode = ERR_DISK_TOO_SMALL;
1614                 goto force_diskless_dec;
1615         }
1616
1617         /* Reset the "barriers don't work" bits here, then force meta data to
1618          * be written, to ensure we determine if barriers are supported. */
1619         if (new_disk_conf->md_flushes)
1620                 clear_bit(MD_NO_FUA, &mdev->flags);
1621         else
1622                 set_bit(MD_NO_FUA, &mdev->flags);
1623
1624         /* Point of no return reached.
1625          * Devices and memory are no longer released by error cleanup below.
1626          * now mdev takes over responsibility, and the state engine should
1627          * clean it up somewhere.  */
1628         D_ASSERT(mdev->ldev == NULL);
1629         mdev->ldev = nbc;
1630         mdev->resync = resync_lru;
1631         mdev->rs_plan_s = new_plan;
1632         nbc = NULL;
1633         resync_lru = NULL;
1634         new_disk_conf = NULL;
1635         new_plan = NULL;
1636
1637         drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1638
1639         if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1640                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1641         else
1642                 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1643
1644         if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1645             !(mdev->state.role == R_PRIMARY && mdev->tconn->susp_nod))
1646                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1647
1648         mdev->send_cnt = 0;
1649         mdev->recv_cnt = 0;
1650         mdev->read_cnt = 0;
1651         mdev->writ_cnt = 0;
1652
1653         drbd_reconsider_max_bio_size(mdev);
1654
1655         /* If I am currently not R_PRIMARY,
1656          * but meta data primary indicator is set,
1657          * I just now recover from a hard crash,
1658          * and have been R_PRIMARY before that crash.
1659          *
1660          * Now, if I had no connection before that crash
1661          * (have been degraded R_PRIMARY), chances are that
1662          * I won't find my peer now either.
1663          *
1664          * In that case, and _only_ in that case,
1665          * we use the degr-wfc-timeout instead of the default,
1666          * so we can automatically recover from a crash of a
1667          * degraded but active "cluster" after a certain timeout.
1668          */
1669         clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1670         if (mdev->state.role != R_PRIMARY &&
1671              drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1672             !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1673                 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1674
1675         dd = drbd_determine_dev_size(mdev, 0, NULL);
1676         if (dd <= DS_ERROR) {
1677                 retcode = ERR_NOMEM_BITMAP;
1678                 goto force_diskless_dec;
1679         } else if (dd == DS_GREW)
1680                 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1681
1682         if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC) ||
1683             (test_bit(CRASHED_PRIMARY, &mdev->flags) &&
1684              drbd_md_test_flag(mdev->ldev, MDF_AL_DISABLED))) {
1685                 dev_info(DEV, "Assuming that all blocks are out of sync "
1686                      "(aka FullSync)\n");
1687                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1688                         "set_n_write from attaching", BM_LOCKED_MASK)) {
1689                         retcode = ERR_IO_MD_DISK;
1690                         goto force_diskless_dec;
1691                 }
1692         } else {
1693                 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1694                         "read from attaching", BM_LOCKED_MASK)) {
1695                         retcode = ERR_IO_MD_DISK;
1696                         goto force_diskless_dec;
1697                 }
1698         }
1699
1700         if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1701                 drbd_suspend_al(mdev); /* IO is still suspended here... */
1702
1703         spin_lock_irq(&mdev->tconn->req_lock);
1704         os = drbd_read_state(mdev);
1705         ns = os;
1706         /* If MDF_CONSISTENT is not set go into inconsistent state,
1707            otherwise investigate MDF_WasUpToDate...
1708            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1709            otherwise into D_CONSISTENT state.
1710         */
1711         if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1712                 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1713                         ns.disk = D_CONSISTENT;
1714                 else
1715                         ns.disk = D_OUTDATED;
1716         } else {
1717                 ns.disk = D_INCONSISTENT;
1718         }
1719
1720         if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1721                 ns.pdsk = D_OUTDATED;
1722
1723         rcu_read_lock();
1724         if (ns.disk == D_CONSISTENT &&
1725             (ns.pdsk == D_OUTDATED || rcu_dereference(mdev->ldev->disk_conf)->fencing == FP_DONT_CARE))
1726                 ns.disk = D_UP_TO_DATE;
1727
1728         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1729            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1730            this point, because drbd_request_state() modifies these
1731            flags. */
1732
1733         if (rcu_dereference(mdev->ldev->disk_conf)->al_updates)
1734                 mdev->ldev->md.flags &= ~MDF_AL_DISABLED;
1735         else
1736                 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1737
1738         rcu_read_unlock();
1739
1740         /* In case we are C_CONNECTED postpone any decision on the new disk
1741            state after the negotiation phase. */
1742         if (mdev->state.conn == C_CONNECTED) {
1743                 mdev->new_state_tmp.i = ns.i;
1744                 ns.i = os.i;
1745                 ns.disk = D_NEGOTIATING;
1746
1747                 /* We expect to receive up-to-date UUIDs soon.
1748                    To avoid a race in receive_state, free p_uuid while
1749                    holding req_lock. I.e. atomic with the state change */
1750                 kfree(mdev->p_uuid);
1751                 mdev->p_uuid = NULL;
1752         }
1753
1754         rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1755         spin_unlock_irq(&mdev->tconn->req_lock);
1756
1757         if (rv < SS_SUCCESS)
1758                 goto force_diskless_dec;
1759
1760         mod_timer(&mdev->request_timer, jiffies + HZ);
1761
1762         if (mdev->state.role == R_PRIMARY)
1763                 mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1764         else
1765                 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1766
1767         drbd_md_mark_dirty(mdev);
1768         drbd_md_sync(mdev);
1769
1770         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1771         put_ldev(mdev);
1772         conn_reconfig_done(mdev->tconn);
1773         drbd_adm_finish(info, retcode);
1774         return 0;
1775
1776  force_diskless_dec:
1777         put_ldev(mdev);
1778  force_diskless:
1779         drbd_force_state(mdev, NS(disk, D_DISKLESS));
1780         drbd_md_sync(mdev);
1781  fail:
1782         conn_reconfig_done(mdev->tconn);
1783         if (nbc) {
1784                 if (nbc->backing_bdev)
1785                         blkdev_put(nbc->backing_bdev,
1786                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1787                 if (nbc->md_bdev)
1788                         blkdev_put(nbc->md_bdev,
1789                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1790                 kfree(nbc);
1791         }
1792         kfree(new_disk_conf);
1793         lc_destroy(resync_lru);
1794         kfree(new_plan);
1795
1796  finish:
1797         drbd_adm_finish(info, retcode);
1798         return 0;
1799 }
1800
1801 static int adm_detach(struct drbd_conf *mdev, int force)
1802 {
1803         enum drbd_state_rv retcode;
1804         int ret;
1805
1806         if (force) {
1807                 set_bit(FORCE_DETACH, &mdev->flags);
1808                 drbd_force_state(mdev, NS(disk, D_FAILED));
1809                 retcode = SS_SUCCESS;
1810                 goto out;
1811         }
1812
1813         drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1814         drbd_md_get_buffer(mdev); /* make sure there is no in-flight meta-data IO */
1815         retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1816         drbd_md_put_buffer(mdev);
1817         /* D_FAILED will transition to DISKLESS. */
1818         ret = wait_event_interruptible(mdev->misc_wait,
1819                         mdev->state.disk != D_FAILED);
1820         drbd_resume_io(mdev);
1821         if ((int)retcode == (int)SS_IS_DISKLESS)
1822                 retcode = SS_NOTHING_TO_DO;
1823         if (ret)
1824                 retcode = ERR_INTR;
1825 out:
1826         return retcode;
1827 }
1828
1829 /* Detaching the disk is a process in multiple stages.  First we need to lock
1830  * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1831  * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1832  * internal references as well.
1833  * Only then we have finally detached. */
1834 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
1835 {
1836         enum drbd_ret_code retcode;
1837         struct detach_parms parms = { };
1838         int err;
1839
1840         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1841         if (!adm_ctx.reply_skb)
1842                 return retcode;
1843         if (retcode != NO_ERROR)
1844                 goto out;
1845
1846         if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
1847                 err = detach_parms_from_attrs(&parms, info);
1848                 if (err) {
1849                         retcode = ERR_MANDATORY_TAG;
1850                         drbd_msg_put_info(from_attrs_err_to_txt(err));
1851                         goto out;
1852                 }
1853         }
1854
1855         retcode = adm_detach(adm_ctx.mdev, parms.force_detach);
1856 out:
1857         drbd_adm_finish(info, retcode);
1858         return 0;
1859 }
1860
1861 static bool conn_resync_running(struct drbd_tconn *tconn)
1862 {
1863         struct drbd_conf *mdev;
1864         bool rv = false;
1865         int vnr;
1866
1867         rcu_read_lock();
1868         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1869                 if (mdev->state.conn == C_SYNC_SOURCE ||
1870                     mdev->state.conn == C_SYNC_TARGET ||
1871                     mdev->state.conn == C_PAUSED_SYNC_S ||
1872                     mdev->state.conn == C_PAUSED_SYNC_T) {
1873                         rv = true;
1874                         break;
1875                 }
1876         }
1877         rcu_read_unlock();
1878
1879         return rv;
1880 }
1881
1882 static bool conn_ov_running(struct drbd_tconn *tconn)
1883 {
1884         struct drbd_conf *mdev;
1885         bool rv = false;
1886         int vnr;
1887
1888         rcu_read_lock();
1889         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1890                 if (mdev->state.conn == C_VERIFY_S ||
1891                     mdev->state.conn == C_VERIFY_T) {
1892                         rv = true;
1893                         break;
1894                 }
1895         }
1896         rcu_read_unlock();
1897
1898         return rv;
1899 }
1900
1901 static enum drbd_ret_code
1902 _check_net_options(struct drbd_tconn *tconn, struct net_conf *old_conf, struct net_conf *new_conf)
1903 {
1904         struct drbd_conf *mdev;
1905         int i;
1906
1907         if (old_conf && tconn->cstate == C_WF_REPORT_PARAMS && tconn->agreed_pro_version < 100) {
1908                 if (new_conf->wire_protocol != old_conf->wire_protocol)
1909                         return ERR_NEED_APV_100;
1910
1911                 if (new_conf->two_primaries != old_conf->two_primaries)
1912                         return ERR_NEED_APV_100;
1913
1914                 if (strcmp(new_conf->integrity_alg, old_conf->integrity_alg))
1915                         return ERR_NEED_APV_100;
1916         }
1917
1918         if (!new_conf->two_primaries &&
1919             conn_highest_role(tconn) == R_PRIMARY &&
1920             conn_highest_peer(tconn) == R_PRIMARY)
1921                 return ERR_NEED_ALLOW_TWO_PRI;
1922
1923         if (new_conf->two_primaries &&
1924             (new_conf->wire_protocol != DRBD_PROT_C))
1925                 return ERR_NOT_PROTO_C;
1926
1927         idr_for_each_entry(&tconn->volumes, mdev, i) {
1928                 if (get_ldev(mdev)) {
1929                         enum drbd_fencing_p fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
1930                         put_ldev(mdev);
1931                         if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
1932                                 return ERR_STONITH_AND_PROT_A;
1933                 }
1934                 if (mdev->state.role == R_PRIMARY && new_conf->discard_my_data)
1935                         return ERR_DISCARD_IMPOSSIBLE;
1936         }
1937
1938         if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A)
1939                 return ERR_CONG_NOT_PROTO_A;
1940
1941         return NO_ERROR;
1942 }
1943
1944 static enum drbd_ret_code
1945 check_net_options(struct drbd_tconn *tconn, struct net_conf *new_conf)
1946 {
1947         static enum drbd_ret_code rv;
1948         struct drbd_conf *mdev;
1949         int i;
1950
1951         rcu_read_lock();
1952         rv = _check_net_options(tconn, rcu_dereference(tconn->net_conf), new_conf);
1953         rcu_read_unlock();
1954
1955         /* tconn->volumes protected by genl_lock() here */
1956         idr_for_each_entry(&tconn->volumes, mdev, i) {
1957                 if (!mdev->bitmap) {
1958                         if(drbd_bm_init(mdev))
1959                                 return ERR_NOMEM;
1960                 }
1961         }
1962
1963         return rv;
1964 }
1965
1966 struct crypto {
1967         struct crypto_hash *verify_tfm;
1968         struct crypto_hash *csums_tfm;
1969         struct crypto_hash *cram_hmac_tfm;
1970         struct crypto_hash *integrity_tfm;
1971 };
1972
1973 static int
1974 alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
1975 {
1976         if (!tfm_name[0])
1977                 return NO_ERROR;
1978
1979         *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
1980         if (IS_ERR(*tfm)) {
1981                 *tfm = NULL;
1982                 return err_alg;
1983         }
1984
1985         return NO_ERROR;
1986 }
1987
1988 static enum drbd_ret_code
1989 alloc_crypto(struct crypto *crypto, struct net_conf *new_conf)
1990 {
1991         char hmac_name[CRYPTO_MAX_ALG_NAME];
1992         enum drbd_ret_code rv;
1993
1994         rv = alloc_hash(&crypto->csums_tfm, new_conf->csums_alg,
1995                        ERR_CSUMS_ALG);
1996         if (rv != NO_ERROR)
1997                 return rv;
1998         rv = alloc_hash(&crypto->verify_tfm, new_conf->verify_alg,
1999                        ERR_VERIFY_ALG);
2000         if (rv != NO_ERROR)
2001                 return rv;
2002         rv = alloc_hash(&crypto->integrity_tfm, new_conf->integrity_alg,
2003                        ERR_INTEGRITY_ALG);
2004         if (rv != NO_ERROR)
2005                 return rv;
2006         if (new_conf->cram_hmac_alg[0] != 0) {
2007                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
2008                          new_conf->cram_hmac_alg);
2009
2010                 rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
2011                                ERR_AUTH_ALG);
2012         }
2013
2014         return rv;
2015 }
2016
2017 static void free_crypto(struct crypto *crypto)
2018 {
2019         crypto_free_hash(crypto->cram_hmac_tfm);
2020         crypto_free_hash(crypto->integrity_tfm);
2021         crypto_free_hash(crypto->csums_tfm);
2022         crypto_free_hash(crypto->verify_tfm);
2023 }
2024
2025 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
2026 {
2027         enum drbd_ret_code retcode;
2028         struct drbd_tconn *tconn;
2029         struct net_conf *old_conf, *new_conf = NULL;
2030         int err;
2031         int ovr; /* online verify running */
2032         int rsr; /* re-sync running */
2033         struct crypto crypto = { };
2034
2035         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
2036         if (!adm_ctx.reply_skb)
2037                 return retcode;
2038         if (retcode != NO_ERROR)
2039                 goto out;
2040
2041         tconn = adm_ctx.tconn;
2042
2043         new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
2044         if (!new_conf) {
2045                 retcode = ERR_NOMEM;
2046                 goto out;
2047         }
2048
2049         conn_reconfig_start(tconn);
2050
2051         mutex_lock(&tconn->data.mutex);
2052         mutex_lock(&tconn->conf_update);
2053         old_conf = tconn->net_conf;
2054
2055         if (!old_conf) {
2056                 drbd_msg_put_info("net conf missing, try connect");
2057                 retcode = ERR_INVALID_REQUEST;
2058                 goto fail;
2059         }
2060
2061         *new_conf = *old_conf;
2062         if (should_set_defaults(info))
2063                 set_net_conf_defaults(new_conf);
2064
2065         err = net_conf_from_attrs_for_change(new_conf, info);
2066         if (err && err != -ENOMSG) {
2067                 retcode = ERR_MANDATORY_TAG;
2068                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2069                 goto fail;
2070         }
2071
2072         retcode = check_net_options(tconn, new_conf);
2073         if (retcode != NO_ERROR)
2074                 goto fail;
2075
2076         /* re-sync running */
2077         rsr = conn_resync_running(tconn);
2078         if (rsr && strcmp(new_conf->csums_alg, old_conf->csums_alg)) {
2079                 retcode = ERR_CSUMS_RESYNC_RUNNING;
2080                 goto fail;
2081         }
2082
2083         /* online verify running */
2084         ovr = conn_ov_running(tconn);
2085         if (ovr && strcmp(new_conf->verify_alg, old_conf->verify_alg)) {
2086                 retcode = ERR_VERIFY_RUNNING;
2087                 goto fail;
2088         }
2089
2090         retcode = alloc_crypto(&crypto, new_conf);
2091         if (retcode != NO_ERROR)
2092                 goto fail;
2093
2094         rcu_assign_pointer(tconn->net_conf, new_conf);
2095
2096         if (!rsr) {
2097                 crypto_free_hash(tconn->csums_tfm);
2098                 tconn->csums_tfm = crypto.csums_tfm;
2099                 crypto.csums_tfm = NULL;
2100         }
2101         if (!ovr) {
2102                 crypto_free_hash(tconn->verify_tfm);
2103                 tconn->verify_tfm = crypto.verify_tfm;
2104                 crypto.verify_tfm = NULL;
2105         }
2106
2107         crypto_free_hash(tconn->integrity_tfm);
2108         tconn->integrity_tfm = crypto.integrity_tfm;
2109         if (tconn->cstate >= C_WF_REPORT_PARAMS && tconn->agreed_pro_version >= 100)
2110                 /* Do this without trying to take tconn->data.mutex again.  */
2111                 __drbd_send_protocol(tconn, P_PROTOCOL_UPDATE);
2112
2113         crypto_free_hash(tconn->cram_hmac_tfm);
2114         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2115
2116         mutex_unlock(&tconn->conf_update);
2117         mutex_unlock(&tconn->data.mutex);
2118         synchronize_rcu();
2119         kfree(old_conf);
2120
2121         if (tconn->cstate >= C_WF_REPORT_PARAMS)
2122                 drbd_send_sync_param(minor_to_mdev(conn_lowest_minor(tconn)));
2123
2124         goto done;
2125
2126  fail:
2127         mutex_unlock(&tconn->conf_update);
2128         mutex_unlock(&tconn->data.mutex);
2129         free_crypto(&crypto);
2130         kfree(new_conf);
2131  done:
2132         conn_reconfig_done(tconn);
2133  out:
2134         drbd_adm_finish(info, retcode);
2135         return 0;
2136 }
2137
2138 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
2139 {
2140         struct drbd_conf *mdev;
2141         struct net_conf *old_conf, *new_conf = NULL;
2142         struct crypto crypto = { };
2143         struct drbd_tconn *tconn;
2144         enum drbd_ret_code retcode;
2145         int i;
2146         int err;
2147
2148         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2149
2150         if (!adm_ctx.reply_skb)
2151                 return retcode;
2152         if (retcode != NO_ERROR)
2153                 goto out;
2154         if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
2155                 drbd_msg_put_info("connection endpoint(s) missing");
2156                 retcode = ERR_INVALID_REQUEST;
2157                 goto out;
2158         }
2159
2160         /* No need for _rcu here. All reconfiguration is
2161          * strictly serialized on genl_lock(). We are protected against
2162          * concurrent reconfiguration/addition/deletion */
2163         list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
2164                 if (nla_len(adm_ctx.my_addr) == tconn->my_addr_len &&
2165                     !memcmp(nla_data(adm_ctx.my_addr), &tconn->my_addr, tconn->my_addr_len)) {
2166                         retcode = ERR_LOCAL_ADDR;
2167                         goto out;
2168                 }
2169
2170                 if (nla_len(adm_ctx.peer_addr) == tconn->peer_addr_len &&
2171                     !memcmp(nla_data(adm_ctx.peer_addr), &tconn->peer_addr, tconn->peer_addr_len)) {
2172                         retcode = ERR_PEER_ADDR;
2173                         goto out;
2174                 }
2175         }
2176
2177         tconn = adm_ctx.tconn;
2178         conn_reconfig_start(tconn);
2179
2180         if (tconn->cstate > C_STANDALONE) {
2181                 retcode = ERR_NET_CONFIGURED;
2182                 goto fail;
2183         }
2184
2185         /* allocation not in the IO path, drbdsetup / netlink process context */
2186         new_conf = kzalloc(sizeof(*new_conf), GFP_KERNEL);
2187         if (!new_conf) {
2188                 retcode = ERR_NOMEM;
2189                 goto fail;
2190         }
2191
2192         set_net_conf_defaults(new_conf);
2193
2194         err = net_conf_from_attrs(new_conf, info);
2195         if (err && err != -ENOMSG) {
2196                 retcode = ERR_MANDATORY_TAG;
2197                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2198                 goto fail;
2199         }
2200
2201         retcode = check_net_options(tconn, new_conf);
2202         if (retcode != NO_ERROR)
2203                 goto fail;
2204
2205         retcode = alloc_crypto(&crypto, new_conf);
2206         if (retcode != NO_ERROR)
2207                 goto fail;
2208
2209         ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2210
2211         conn_flush_workqueue(tconn);
2212
2213         mutex_lock(&tconn->conf_update);
2214         old_conf = tconn->net_conf;
2215         if (old_conf) {
2216                 retcode = ERR_NET_CONFIGURED;
2217                 mutex_unlock(&tconn->conf_update);
2218                 goto fail;
2219         }
2220         rcu_assign_pointer(tconn->net_conf, new_conf);
2221
2222         conn_free_crypto(tconn);
2223         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2224         tconn->integrity_tfm = crypto.integrity_tfm;
2225         tconn->csums_tfm = crypto.csums_tfm;
2226         tconn->verify_tfm = crypto.verify_tfm;
2227
2228         tconn->my_addr_len = nla_len(adm_ctx.my_addr);
2229         memcpy(&tconn->my_addr, nla_data(adm_ctx.my_addr), tconn->my_addr_len);
2230         tconn->peer_addr_len = nla_len(adm_ctx.peer_addr);
2231         memcpy(&tconn->peer_addr, nla_data(adm_ctx.peer_addr), tconn->peer_addr_len);
2232
2233         mutex_unlock(&tconn->conf_update);
2234
2235         rcu_read_lock();
2236         idr_for_each_entry(&tconn->volumes, mdev, i) {
2237                 mdev->send_cnt = 0;
2238                 mdev->recv_cnt = 0;
2239         }
2240         rcu_read_unlock();
2241
2242         retcode = conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2243
2244         conn_reconfig_done(tconn);
2245         drbd_adm_finish(info, retcode);
2246         return 0;
2247
2248 fail:
2249         free_crypto(&crypto);
2250         kfree(new_conf);
2251
2252         conn_reconfig_done(tconn);
2253 out:
2254         drbd_adm_finish(info, retcode);
2255         return 0;
2256 }
2257
2258 static enum drbd_state_rv conn_try_disconnect(struct drbd_tconn *tconn, bool force)
2259 {
2260         enum drbd_state_rv rv;
2261
2262         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2263                         force ? CS_HARD : 0);
2264
2265         switch (rv) {
2266         case SS_NOTHING_TO_DO:
2267                 break;
2268         case SS_ALREADY_STANDALONE:
2269                 return SS_SUCCESS;
2270         case SS_PRIMARY_NOP:
2271                 /* Our state checking code wants to see the peer outdated. */
2272                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING, pdsk, D_OUTDATED), 0);
2273
2274                 if (rv == SS_OUTDATE_WO_CONN) /* lost connection before graceful disconnect succeeded */
2275                         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_VERBOSE);
2276
2277                 break;
2278         case SS_CW_FAILED_BY_PEER:
2279                 /* The peer probably wants to see us outdated. */
2280                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2281                                                         disk, D_OUTDATED), 0);
2282                 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2283                         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2284                                         CS_HARD);
2285                 }
2286                 break;
2287         default:;
2288                 /* no special handling necessary */
2289         }
2290
2291         if (rv >= SS_SUCCESS) {
2292                 enum drbd_state_rv rv2;
2293                 /* No one else can reconfigure the network while I am here.
2294                  * The state handling only uses drbd_thread_stop_nowait(),
2295                  * we want to really wait here until the receiver is no more.
2296                  */
2297                 drbd_thread_stop(&adm_ctx.tconn->receiver);
2298
2299                 /* Race breaker.  This additional state change request may be
2300                  * necessary, if this was a forced disconnect during a receiver
2301                  * restart.  We may have "killed" the receiver thread just
2302                  * after drbdd_init() returned.  Typically, we should be
2303                  * C_STANDALONE already, now, and this becomes a no-op.
2304                  */
2305                 rv2 = conn_request_state(tconn, NS(conn, C_STANDALONE),
2306                                 CS_VERBOSE | CS_HARD);
2307                 if (rv2 < SS_SUCCESS)
2308                         conn_err(tconn,
2309                                 "unexpected rv2=%d in conn_try_disconnect()\n",
2310                                 rv2);
2311         }
2312         return rv;
2313 }
2314
2315 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2316 {
2317         struct disconnect_parms parms;
2318         struct drbd_tconn *tconn;
2319         enum drbd_state_rv rv;
2320         enum drbd_ret_code retcode;
2321         int err;
2322
2323         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
2324         if (!adm_ctx.reply_skb)
2325                 return retcode;
2326         if (retcode != NO_ERROR)
2327                 goto fail;
2328
2329         tconn = adm_ctx.tconn;
2330         memset(&parms, 0, sizeof(parms));
2331         if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2332                 err = disconnect_parms_from_attrs(&parms, info);
2333                 if (err) {
2334                         retcode = ERR_MANDATORY_TAG;
2335                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2336                         goto fail;
2337                 }
2338         }
2339
2340         rv = conn_try_disconnect(tconn, parms.force_disconnect);
2341         if (rv < SS_SUCCESS)
2342                 retcode = rv;  /* FIXME: Type mismatch. */
2343         else
2344                 retcode = NO_ERROR;
2345  fail:
2346         drbd_adm_finish(info, retcode);
2347         return 0;
2348 }
2349
2350 void resync_after_online_grow(struct drbd_conf *mdev)
2351 {
2352         int iass; /* I am sync source */
2353
2354         dev_info(DEV, "Resync of new storage after online grow\n");
2355         if (mdev->state.role != mdev->state.peer)
2356                 iass = (mdev->state.role == R_PRIMARY);
2357         else
2358                 iass = test_bit(RESOLVE_CONFLICTS, &mdev->tconn->flags);
2359
2360         if (iass)
2361                 drbd_start_resync(mdev, C_SYNC_SOURCE);
2362         else
2363                 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2364 }
2365
2366 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2367 {
2368         struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
2369         struct resize_parms rs;
2370         struct drbd_conf *mdev;
2371         enum drbd_ret_code retcode;
2372         enum determine_dev_size dd;
2373         bool change_al_layout = false;
2374         enum dds_flags ddsf;
2375         sector_t u_size;
2376         int err;
2377
2378         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2379         if (!adm_ctx.reply_skb)
2380                 return retcode;
2381         if (retcode != NO_ERROR)
2382                 goto fail;
2383
2384         mdev = adm_ctx.mdev;
2385         if (!get_ldev(mdev)) {
2386                 retcode = ERR_NO_DISK;
2387                 goto fail;
2388         }
2389
2390         memset(&rs, 0, sizeof(struct resize_parms));
2391         rs.al_stripes = mdev->ldev->md.al_stripes;
2392         rs.al_stripe_size = mdev->ldev->md.al_stripe_size_4k * 4;
2393         if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2394                 err = resize_parms_from_attrs(&rs, info);
2395                 if (err) {
2396                         retcode = ERR_MANDATORY_TAG;
2397                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2398                         goto fail_ldev;
2399                 }
2400         }
2401
2402         if (mdev->state.conn > C_CONNECTED) {
2403                 retcode = ERR_RESIZE_RESYNC;
2404                 goto fail_ldev;
2405         }
2406
2407         if (mdev->state.role == R_SECONDARY &&
2408             mdev->state.peer == R_SECONDARY) {
2409                 retcode = ERR_NO_PRIMARY;
2410                 goto fail_ldev;
2411         }
2412
2413         if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
2414                 retcode = ERR_NEED_APV_93;
2415                 goto fail_ldev;
2416         }
2417
2418         rcu_read_lock();
2419         u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
2420         rcu_read_unlock();
2421         if (u_size != (sector_t)rs.resize_size) {
2422                 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2423                 if (!new_disk_conf) {
2424                         retcode = ERR_NOMEM;
2425                         goto fail_ldev;
2426                 }
2427         }
2428
2429         if (mdev->ldev->md.al_stripes != rs.al_stripes ||
2430             mdev->ldev->md.al_stripe_size_4k != rs.al_stripe_size / 4) {
2431                 u32 al_size_k = rs.al_stripes * rs.al_stripe_size;
2432
2433                 if (al_size_k > (16 * 1024 * 1024)) {
2434                         retcode = ERR_MD_LAYOUT_TOO_BIG;
2435                         goto fail_ldev;
2436                 }
2437
2438                 if (al_size_k < MD_32kB_SECT/2) {
2439                         retcode = ERR_MD_LAYOUT_TOO_SMALL;
2440                         goto fail_ldev;
2441                 }
2442
2443                 if (mdev->state.conn != C_CONNECTED) {
2444                         retcode = ERR_MD_LAYOUT_CONNECTED;
2445                         goto fail_ldev;
2446                 }
2447
2448                 change_al_layout = true;
2449         }
2450
2451         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
2452                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
2453
2454         if (new_disk_conf) {
2455                 mutex_lock(&mdev->tconn->conf_update);
2456                 old_disk_conf = mdev->ldev->disk_conf;
2457                 *new_disk_conf = *old_disk_conf;
2458                 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2459                 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
2460                 mutex_unlock(&mdev->tconn->conf_update);
2461                 synchronize_rcu();
2462                 kfree(old_disk_conf);
2463         }
2464
2465         ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2466         dd = drbd_determine_dev_size(mdev, ddsf, change_al_layout ? &rs : NULL);
2467         drbd_md_sync(mdev);
2468         put_ldev(mdev);
2469         if (dd == DS_ERROR) {
2470                 retcode = ERR_NOMEM_BITMAP;
2471                 goto fail;
2472         } else if (dd == DS_ERROR_SPACE_MD) {
2473                 retcode = ERR_MD_LAYOUT_NO_FIT;
2474                 goto fail;
2475         } else if (dd == DS_ERROR_SHRINK) {
2476                 retcode = ERR_IMPLICIT_SHRINK;
2477                 goto fail;
2478         }
2479
2480         if (mdev->state.conn == C_CONNECTED) {
2481                 if (dd == DS_GREW)
2482                         set_bit(RESIZE_PENDING, &mdev->flags);
2483
2484                 drbd_send_uuids(mdev);
2485                 drbd_send_sizes(mdev, 1, ddsf);
2486         }
2487
2488  fail:
2489         drbd_adm_finish(info, retcode);
2490         return 0;
2491
2492  fail_ldev:
2493         put_ldev(mdev);
2494         goto fail;
2495 }
2496
2497 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2498 {
2499         enum drbd_ret_code retcode;
2500         struct drbd_tconn *tconn;
2501         struct res_opts res_opts;
2502         int err;
2503
2504         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2505         if (!adm_ctx.reply_skb)
2506                 return retcode;
2507         if (retcode != NO_ERROR)
2508                 goto fail;
2509         tconn = adm_ctx.tconn;
2510
2511         res_opts = tconn->res_opts;
2512         if (should_set_defaults(info))
2513                 set_res_opts_defaults(&res_opts);
2514
2515         err = res_opts_from_attrs(&res_opts, info);
2516         if (err && err != -ENOMSG) {
2517                 retcode = ERR_MANDATORY_TAG;
2518                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2519                 goto fail;
2520         }
2521
2522         err = set_resource_options(tconn, &res_opts);
2523         if (err) {
2524                 retcode = ERR_INVALID_REQUEST;
2525                 if (err == -ENOMEM)
2526                         retcode = ERR_NOMEM;
2527         }
2528
2529 fail:
2530         drbd_adm_finish(info, retcode);
2531         return 0;
2532 }
2533
2534 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2535 {
2536         struct drbd_conf *mdev;
2537         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2538
2539         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2540         if (!adm_ctx.reply_skb)
2541                 return retcode;
2542         if (retcode != NO_ERROR)
2543                 goto out;
2544
2545         mdev = adm_ctx.mdev;
2546
2547         /* If there is still bitmap IO pending, probably because of a previous
2548          * resync just being finished, wait for it before requesting a new resync.
2549          * Also wait for it's after_state_ch(). */
2550         drbd_suspend_io(mdev);
2551         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2552         drbd_flush_workqueue(mdev);
2553
2554         /* If we happen to be C_STANDALONE R_SECONDARY, just change to
2555          * D_INCONSISTENT, and set all bits in the bitmap.  Otherwise,
2556          * try to start a resync handshake as sync target for full sync.
2557          */
2558         if (mdev->state.conn == C_STANDALONE && mdev->state.role == R_SECONDARY) {
2559                 retcode = drbd_request_state(mdev, NS(disk, D_INCONSISTENT));
2560                 if (retcode >= SS_SUCCESS) {
2561                         if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
2562                                 "set_n_write from invalidate", BM_LOCKED_MASK))
2563                                 retcode = ERR_IO_MD_DISK;
2564                 }
2565         } else
2566                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2567         drbd_resume_io(mdev);
2568
2569 out:
2570         drbd_adm_finish(info, retcode);
2571         return 0;
2572 }
2573
2574 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2575                 union drbd_state mask, union drbd_state val)
2576 {
2577         enum drbd_ret_code retcode;
2578
2579         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2580         if (!adm_ctx.reply_skb)
2581                 return retcode;
2582         if (retcode != NO_ERROR)
2583                 goto out;
2584
2585         retcode = drbd_request_state(adm_ctx.mdev, mask, val);
2586 out:
2587         drbd_adm_finish(info, retcode);
2588         return 0;
2589 }
2590
2591 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
2592 {
2593         int rv;
2594
2595         rv = drbd_bmio_set_n_write(mdev);
2596         drbd_suspend_al(mdev);
2597         return rv;
2598 }
2599
2600 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
2601 {
2602         int retcode; /* drbd_ret_code, drbd_state_rv */
2603         struct drbd_conf *mdev;
2604
2605         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2606         if (!adm_ctx.reply_skb)
2607                 return retcode;
2608         if (retcode != NO_ERROR)
2609                 goto out;
2610
2611         mdev = adm_ctx.mdev;
2612
2613         /* If there is still bitmap IO pending, probably because of a previous
2614          * resync just being finished, wait for it before requesting a new resync.
2615          * Also wait for it's after_state_ch(). */
2616         drbd_suspend_io(mdev);
2617         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2618         drbd_flush_workqueue(mdev);
2619
2620         /* If we happen to be C_STANDALONE R_PRIMARY, just set all bits
2621          * in the bitmap.  Otherwise, try to start a resync handshake
2622          * as sync source for full sync.
2623          */
2624         if (mdev->state.conn == C_STANDALONE && mdev->state.role == R_PRIMARY) {
2625                 /* The peer will get a resync upon connect anyways. Just make that
2626                    into a full resync. */
2627                 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
2628                 if (retcode >= SS_SUCCESS) {
2629                         if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
2630                                 "set_n_write from invalidate_peer",
2631                                 BM_LOCKED_SET_ALLOWED))
2632                                 retcode = ERR_IO_MD_DISK;
2633                 }
2634         } else
2635                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
2636         drbd_resume_io(mdev);
2637
2638 out:
2639         drbd_adm_finish(info, retcode);
2640         return 0;
2641 }
2642
2643 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2644 {
2645         enum drbd_ret_code retcode;
2646
2647         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2648         if (!adm_ctx.reply_skb)
2649                 return retcode;
2650         if (retcode != NO_ERROR)
2651                 goto out;
2652
2653         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2654                 retcode = ERR_PAUSE_IS_SET;
2655 out:
2656         drbd_adm_finish(info, retcode);
2657         return 0;
2658 }
2659
2660 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
2661 {
2662         union drbd_dev_state s;
2663         enum drbd_ret_code retcode;
2664
2665         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2666         if (!adm_ctx.reply_skb)
2667                 return retcode;
2668         if (retcode != NO_ERROR)
2669                 goto out;
2670
2671         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2672                 s = adm_ctx.mdev->state;
2673                 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2674                         retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2675                                   s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2676                 } else {
2677                         retcode = ERR_PAUSE_IS_CLEAR;
2678                 }
2679         }
2680
2681 out:
2682         drbd_adm_finish(info, retcode);
2683         return 0;
2684 }
2685
2686 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
2687 {
2688         return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
2689 }
2690
2691 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
2692 {
2693         struct drbd_conf *mdev;
2694         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2695
2696         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2697         if (!adm_ctx.reply_skb)
2698                 return retcode;
2699         if (retcode != NO_ERROR)
2700                 goto out;
2701
2702         mdev = adm_ctx.mdev;
2703         if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2704                 drbd_uuid_new_current(mdev);
2705                 clear_bit(NEW_CUR_UUID, &mdev->flags);
2706         }
2707         drbd_suspend_io(mdev);
2708         retcode = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2709         if (retcode == SS_SUCCESS) {
2710                 if (mdev->state.conn < C_CONNECTED)
2711                         tl_clear(mdev->tconn);
2712                 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2713                         tl_restart(mdev->tconn, FAIL_FROZEN_DISK_IO);
2714         }
2715         drbd_resume_io(mdev);
2716
2717 out:
2718         drbd_adm_finish(info, retcode);
2719         return 0;
2720 }
2721
2722 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
2723 {
2724         return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
2725 }
2726
2727 int nla_put_drbd_cfg_context(struct sk_buff *skb, struct drbd_tconn *tconn, unsigned vnr)
2728 {
2729         struct nlattr *nla;
2730         nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2731         if (!nla)
2732                 goto nla_put_failure;
2733         if (vnr != VOLUME_UNSPECIFIED &&
2734             nla_put_u32(skb, T_ctx_volume, vnr))
2735                 goto nla_put_failure;
2736         if (nla_put_string(skb, T_ctx_resource_name, tconn->name))
2737                 goto nla_put_failure;
2738         if (tconn->my_addr_len &&
2739             nla_put(skb, T_ctx_my_addr, tconn->my_addr_len, &tconn->my_addr))
2740                 goto nla_put_failure;
2741         if (tconn->peer_addr_len &&
2742             nla_put(skb, T_ctx_peer_addr, tconn->peer_addr_len, &tconn->peer_addr))
2743                 goto nla_put_failure;
2744         nla_nest_end(skb, nla);
2745         return 0;
2746
2747 nla_put_failure:
2748         if (nla)
2749                 nla_nest_cancel(skb, nla);
2750         return -EMSGSIZE;
2751 }
2752
2753 int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
2754                 const struct sib_info *sib)
2755 {
2756         struct state_info *si = NULL; /* for sizeof(si->member); */
2757         struct nlattr *nla;
2758         int got_ldev;
2759         int err = 0;
2760         int exclude_sensitive;
2761
2762         /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2763          * to.  So we better exclude_sensitive information.
2764          *
2765          * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2766          * in the context of the requesting user process. Exclude sensitive
2767          * information, unless current has superuser.
2768          *
2769          * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2770          * relies on the current implementation of netlink_dump(), which
2771          * executes the dump callback successively from netlink_recvmsg(),
2772          * always in the context of the receiving process */
2773         exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2774
2775         got_ldev = get_ldev(mdev);
2776
2777         /* We need to add connection name and volume number information still.
2778          * Minor number is in drbd_genlmsghdr. */
2779         if (nla_put_drbd_cfg_context(skb, mdev->tconn, mdev->vnr))
2780                 goto nla_put_failure;
2781
2782         if (res_opts_to_skb(skb, &mdev->tconn->res_opts, exclude_sensitive))
2783                 goto nla_put_failure;
2784
2785         rcu_read_lock();
2786         if (got_ldev) {
2787                 struct disk_conf *disk_conf;
2788
2789                 disk_conf = rcu_dereference(mdev->ldev->disk_conf);
2790                 err = disk_conf_to_skb(skb, disk_conf, exclude_sensitive);
2791         }
2792         if (!err) {
2793                 struct net_conf *nc;
2794
2795                 nc = rcu_dereference(mdev->tconn->net_conf);
2796                 if (nc)
2797                         err = net_conf_to_skb(skb, nc, exclude_sensitive);
2798         }
2799         rcu_read_unlock();
2800         if (err)
2801                 goto nla_put_failure;
2802
2803         nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2804         if (!nla)
2805                 goto nla_put_failure;
2806         if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
2807             nla_put_u32(skb, T_current_state, mdev->state.i) ||
2808             nla_put_u64(skb, T_ed_uuid, mdev->ed_uuid) ||
2809             nla_put_u64(skb, T_capacity, drbd_get_capacity(mdev->this_bdev)) ||
2810             nla_put_u64(skb, T_send_cnt, mdev->send_cnt) ||
2811             nla_put_u64(skb, T_recv_cnt, mdev->recv_cnt) ||
2812             nla_put_u64(skb, T_read_cnt, mdev->read_cnt) ||
2813             nla_put_u64(skb, T_writ_cnt, mdev->writ_cnt) ||
2814             nla_put_u64(skb, T_al_writ_cnt, mdev->al_writ_cnt) ||
2815             nla_put_u64(skb, T_bm_writ_cnt, mdev->bm_writ_cnt) ||
2816             nla_put_u32(skb, T_ap_bio_cnt, atomic_read(&mdev->ap_bio_cnt)) ||
2817             nla_put_u32(skb, T_ap_pending_cnt, atomic_read(&mdev->ap_pending_cnt)) ||
2818             nla_put_u32(skb, T_rs_pending_cnt, atomic_read(&mdev->rs_pending_cnt)))
2819                 goto nla_put_failure;
2820
2821         if (got_ldev) {
2822                 int err;
2823
2824                 spin_lock_irq(&mdev->ldev->md.uuid_lock);
2825                 err = nla_put(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid);
2826                 spin_unlock_irq(&mdev->ldev->md.uuid_lock);
2827
2828                 if (err)
2829                         goto nla_put_failure;
2830
2831                 if (nla_put_u32(skb, T_disk_flags, mdev->ldev->md.flags) ||
2832                     nla_put_u64(skb, T_bits_total, drbd_bm_bits(mdev)) ||
2833                     nla_put_u64(skb, T_bits_oos, drbd_bm_total_weight(mdev)))
2834                         goto nla_put_failure;
2835                 if (C_SYNC_SOURCE <= mdev->state.conn &&
2836                     C_PAUSED_SYNC_T >= mdev->state.conn) {
2837                         if (nla_put_u64(skb, T_bits_rs_total, mdev->rs_total) ||
2838                             nla_put_u64(skb, T_bits_rs_failed, mdev->rs_failed))
2839                                 goto nla_put_failure;
2840                 }
2841         }
2842
2843         if (sib) {
2844                 switch(sib->sib_reason) {
2845                 case SIB_SYNC_PROGRESS:
2846                 case SIB_GET_STATUS_REPLY:
2847                         break;
2848                 case SIB_STATE_CHANGE:
2849                         if (nla_put_u32(skb, T_prev_state, sib->os.i) ||
2850                             nla_put_u32(skb, T_new_state, sib->ns.i))
2851                                 goto nla_put_failure;
2852                         break;
2853                 case SIB_HELPER_POST:
2854                         if (nla_put_u32(skb, T_helper_exit_code,
2855                                         sib->helper_exit_code))
2856                                 goto nla_put_failure;
2857                         /* fall through */
2858                 case SIB_HELPER_PRE:
2859                         if (nla_put_string(skb, T_helper, sib->helper_name))
2860                                 goto nla_put_failure;
2861                         break;
2862                 }
2863         }
2864         nla_nest_end(skb, nla);
2865
2866         if (0)
2867 nla_put_failure:
2868                 err = -EMSGSIZE;
2869         if (got_ldev)
2870                 put_ldev(mdev);
2871         return err;
2872 }
2873
2874 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
2875 {
2876         enum drbd_ret_code retcode;
2877         int err;
2878
2879         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2880         if (!adm_ctx.reply_skb)
2881                 return retcode;
2882         if (retcode != NO_ERROR)
2883                 goto out;
2884
2885         err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.mdev, NULL);
2886         if (err) {
2887                 nlmsg_free(adm_ctx.reply_skb);
2888                 return err;
2889         }
2890 out:
2891         drbd_adm_finish(info, retcode);
2892         return 0;
2893 }
2894
2895 int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
2896 {
2897         struct drbd_conf *mdev;
2898         struct drbd_genlmsghdr *dh;
2899         struct drbd_tconn *pos = (struct drbd_tconn*)cb->args[0];
2900         struct drbd_tconn *tconn = NULL;
2901         struct drbd_tconn *tmp;
2902         unsigned volume = cb->args[1];
2903
2904         /* Open coded, deferred, iteration:
2905          * list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
2906          *      idr_for_each_entry(&tconn->volumes, mdev, i) {
2907          *        ...
2908          *      }
2909          * }
2910          * where tconn is cb->args[0];
2911          * and i is cb->args[1];
2912          *
2913          * cb->args[2] indicates if we shall loop over all resources,
2914          * or just dump all volumes of a single resource.
2915          *
2916          * This may miss entries inserted after this dump started,
2917          * or entries deleted before they are reached.
2918          *
2919          * We need to make sure the mdev won't disappear while
2920          * we are looking at it, and revalidate our iterators
2921          * on each iteration.
2922          */
2923
2924         /* synchronize with conn_create()/conn_destroy() */
2925         rcu_read_lock();
2926         /* revalidate iterator position */
2927         list_for_each_entry_rcu(tmp, &drbd_tconns, all_tconn) {
2928                 if (pos == NULL) {
2929                         /* first iteration */
2930                         pos = tmp;
2931                         tconn = pos;
2932                         break;
2933                 }
2934                 if (tmp == pos) {
2935                         tconn = pos;
2936                         break;
2937                 }
2938         }
2939         if (tconn) {
2940 next_tconn:
2941                 mdev = idr_get_next(&tconn->volumes, &volume);
2942                 if (!mdev) {
2943                         /* No more volumes to dump on this tconn.
2944                          * Advance tconn iterator. */
2945                         pos = list_entry_rcu(tconn->all_tconn.next,
2946                                              struct drbd_tconn, all_tconn);
2947                         /* Did we dump any volume on this tconn yet? */
2948                         if (volume != 0) {
2949                                 /* If we reached the end of the list,
2950                                  * or only a single resource dump was requested,
2951                                  * we are done. */
2952                                 if (&pos->all_tconn == &drbd_tconns || cb->args[2])
2953                                         goto out;
2954                                 volume = 0;
2955                                 tconn = pos;
2956                                 goto next_tconn;
2957                         }
2958                 }
2959
2960                 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
2961                                 cb->nlh->nlmsg_seq, &drbd_genl_family,
2962                                 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
2963                 if (!dh)
2964                         goto out;
2965
2966                 if (!mdev) {
2967                         /* This is a tconn without a single volume.
2968                          * Suprisingly enough, it may have a network
2969                          * configuration. */
2970                         struct net_conf *nc;
2971                         dh->minor = -1U;
2972                         dh->ret_code = NO_ERROR;
2973                         if (nla_put_drbd_cfg_context(skb, tconn, VOLUME_UNSPECIFIED))
2974                                 goto cancel;
2975                         nc = rcu_dereference(tconn->net_conf);
2976                         if (nc && net_conf_to_skb(skb, nc, 1) != 0)
2977                                 goto cancel;
2978                         goto done;
2979                 }
2980
2981                 D_ASSERT(mdev->vnr == volume);
2982                 D_ASSERT(mdev->tconn == tconn);
2983
2984                 dh->minor = mdev_to_minor(mdev);
2985                 dh->ret_code = NO_ERROR;
2986
2987                 if (nla_put_status_info(skb, mdev, NULL)) {
2988 cancel:
2989                         genlmsg_cancel(skb, dh);
2990                         goto out;
2991                 }
2992 done:
2993                 genlmsg_end(skb, dh);
2994         }
2995
2996 out:
2997         rcu_read_unlock();
2998         /* where to start the next iteration */
2999         cb->args[0] = (long)pos;
3000         cb->args[1] = (pos == tconn) ? volume + 1 : 0;
3001
3002         /* No more tconns/volumes/minors found results in an empty skb.
3003          * Which will terminate the dump. */
3004         return skb->len;
3005 }
3006
3007 /*
3008  * Request status of all resources, or of all volumes within a single resource.
3009  *
3010  * This is a dump, as the answer may not fit in a single reply skb otherwise.
3011  * Which means we cannot use the family->attrbuf or other such members, because
3012  * dump is NOT protected by the genl_lock().  During dump, we only have access
3013  * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
3014  *
3015  * Once things are setup properly, we call into get_one_status().
3016  */
3017 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
3018 {
3019         const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
3020         struct nlattr *nla;
3021         const char *resource_name;
3022         struct drbd_tconn *tconn;
3023         int maxtype;
3024
3025         /* Is this a followup call? */
3026         if (cb->args[0]) {
3027                 /* ... of a single resource dump,
3028                  * and the resource iterator has been advanced already? */
3029                 if (cb->args[2] && cb->args[2] != cb->args[0])
3030                         return 0; /* DONE. */
3031                 goto dump;
3032         }
3033
3034         /* First call (from netlink_dump_start).  We need to figure out
3035          * which resource(s) the user wants us to dump. */
3036         nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
3037                         nlmsg_attrlen(cb->nlh, hdrlen),
3038                         DRBD_NLA_CFG_CONTEXT);
3039
3040         /* No explicit context given.  Dump all. */
3041         if (!nla)
3042                 goto dump;
3043         maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
3044         nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
3045         if (IS_ERR(nla))
3046                 return PTR_ERR(nla);
3047         /* context given, but no name present? */
3048         if (!nla)
3049                 return -EINVAL;
3050         resource_name = nla_data(nla);
3051         tconn = conn_get_by_name(resource_name);
3052
3053         if (!tconn)
3054                 return -ENODEV;
3055
3056         kref_put(&tconn->kref, &conn_destroy); /* get_one_status() (re)validates tconn by itself */
3057
3058         /* prime iterators, and set "filter" mode mark:
3059          * only dump this tconn. */
3060         cb->args[0] = (long)tconn;
3061         /* cb->args[1] = 0; passed in this way. */
3062         cb->args[2] = (long)tconn;
3063
3064 dump:
3065         return get_one_status(skb, cb);
3066 }
3067
3068 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
3069 {
3070         enum drbd_ret_code retcode;
3071         struct timeout_parms tp;
3072         int err;
3073
3074         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3075         if (!adm_ctx.reply_skb)
3076                 return retcode;
3077         if (retcode != NO_ERROR)
3078                 goto out;
3079
3080         tp.timeout_type =
3081                 adm_ctx.mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
3082                 test_bit(USE_DEGR_WFC_T, &adm_ctx.mdev->flags) ? UT_DEGRADED :
3083                 UT_DEFAULT;
3084
3085         err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
3086         if (err) {
3087                 nlmsg_free(adm_ctx.reply_skb);
3088                 return err;
3089         }
3090 out:
3091         drbd_adm_finish(info, retcode);
3092         return 0;
3093 }
3094
3095 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
3096 {
3097         struct drbd_conf *mdev;
3098         enum drbd_ret_code retcode;
3099         struct start_ov_parms parms;
3100
3101         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3102         if (!adm_ctx.reply_skb)
3103                 return retcode;
3104         if (retcode != NO_ERROR)
3105                 goto out;
3106
3107         mdev = adm_ctx.mdev;
3108
3109         /* resume from last known position, if possible */
3110         parms.ov_start_sector = mdev->ov_start_sector;
3111         parms.ov_stop_sector = ULLONG_MAX;
3112         if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
3113                 int err = start_ov_parms_from_attrs(&parms, info);
3114                 if (err) {
3115                         retcode = ERR_MANDATORY_TAG;
3116                         drbd_msg_put_info(from_attrs_err_to_txt(err));
3117                         goto out;
3118                 }
3119         }
3120         /* w_make_ov_request expects position to be aligned */
3121         mdev->ov_start_sector = parms.ov_start_sector & ~(BM_SECT_PER_BIT-1);
3122         mdev->ov_stop_sector = parms.ov_stop_sector;
3123
3124         /* If there is still bitmap IO pending, e.g. previous resync or verify
3125          * just being finished, wait for it before requesting a new resync. */
3126         drbd_suspend_io(mdev);
3127         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
3128         retcode = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
3129         drbd_resume_io(mdev);
3130 out:
3131         drbd_adm_finish(info, retcode);
3132         return 0;
3133 }
3134
3135
3136 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
3137 {
3138         struct drbd_conf *mdev;
3139         enum drbd_ret_code retcode;
3140         int skip_initial_sync = 0;
3141         int err;
3142         struct new_c_uuid_parms args;
3143
3144         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3145         if (!adm_ctx.reply_skb)
3146                 return retcode;
3147         if (retcode != NO_ERROR)
3148                 goto out_nolock;
3149
3150         mdev = adm_ctx.mdev;
3151         memset(&args, 0, sizeof(args));
3152         if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
3153                 err = new_c_uuid_parms_from_attrs(&args, info);
3154                 if (err) {
3155                         retcode = ERR_MANDATORY_TAG;
3156                         drbd_msg_put_info(from_attrs_err_to_txt(err));
3157                         goto out_nolock;
3158                 }
3159         }
3160
3161         mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
3162
3163         if (!get_ldev(mdev)) {
3164                 retcode = ERR_NO_DISK;
3165                 goto out;
3166         }
3167
3168         /* this is "skip initial sync", assume to be clean */
3169         if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
3170             mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
3171                 dev_info(DEV, "Preparing to skip initial sync\n");
3172                 skip_initial_sync = 1;
3173         } else if (mdev->state.conn != C_STANDALONE) {
3174                 retcode = ERR_CONNECTED;
3175                 goto out_dec;
3176         }
3177
3178         drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
3179         drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
3180
3181         if (args.clear_bm) {
3182                 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
3183                         "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
3184                 if (err) {
3185                         dev_err(DEV, "Writing bitmap failed with %d\n",err);
3186                         retcode = ERR_IO_MD_DISK;
3187                 }
3188                 if (skip_initial_sync) {
3189                         drbd_send_uuids_skip_initial_sync(mdev);
3190                         _drbd_uuid_set(mdev, UI_BITMAP, 0);
3191                         drbd_print_uuids(mdev, "cleared bitmap UUID");
3192                         spin_lock_irq(&mdev->tconn->req_lock);
3193                         _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3194                                         CS_VERBOSE, NULL);
3195                         spin_unlock_irq(&mdev->tconn->req_lock);
3196                 }
3197         }
3198
3199         drbd_md_sync(mdev);
3200 out_dec:
3201         put_ldev(mdev);
3202 out:
3203         mutex_unlock(mdev->state_mutex);
3204 out_nolock:
3205         drbd_adm_finish(info, retcode);
3206         return 0;
3207 }
3208
3209 static enum drbd_ret_code
3210 drbd_check_resource_name(const char *name)
3211 {
3212         if (!name || !name[0]) {
3213                 drbd_msg_put_info("resource name missing");
3214                 return ERR_MANDATORY_TAG;
3215         }
3216         /* if we want to use these in sysfs/configfs/debugfs some day,
3217          * we must not allow slashes */
3218         if (strchr(name, '/')) {
3219                 drbd_msg_put_info("invalid resource name");
3220                 return ERR_INVALID_REQUEST;
3221         }
3222         return NO_ERROR;
3223 }
3224
3225 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
3226 {
3227         enum drbd_ret_code retcode;
3228         struct res_opts res_opts;
3229         int err;
3230
3231         retcode = drbd_adm_prepare(skb, info, 0);
3232         if (!adm_ctx.reply_skb)
3233                 return retcode;
3234         if (retcode != NO_ERROR)
3235                 goto out;
3236
3237         set_res_opts_defaults(&res_opts);
3238         err = res_opts_from_attrs(&res_opts, info);
3239         if (err && err != -ENOMSG) {
3240                 retcode = ERR_MANDATORY_TAG;
3241                 drbd_msg_put_info(from_attrs_err_to_txt(err));
3242                 goto out;
3243         }
3244
3245         retcode = drbd_check_resource_name(adm_ctx.resource_name);
3246         if (retcode != NO_ERROR)
3247                 goto out;
3248
3249         if (adm_ctx.tconn) {
3250                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
3251                         retcode = ERR_INVALID_REQUEST;
3252                         drbd_msg_put_info("resource exists");
3253                 }
3254                 /* else: still NO_ERROR */
3255                 goto out;
3256         }
3257
3258         if (!conn_create(adm_ctx.resource_name, &res_opts))
3259                 retcode = ERR_NOMEM;
3260 out:
3261         drbd_adm_finish(info, retcode);
3262         return 0;
3263 }
3264
3265 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info)
3266 {
3267         struct drbd_genlmsghdr *dh = info->userhdr;
3268         enum drbd_ret_code retcode;
3269
3270         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3271         if (!adm_ctx.reply_skb)
3272                 return retcode;
3273         if (retcode != NO_ERROR)
3274                 goto out;
3275
3276         if (dh->minor > MINORMASK) {
3277                 drbd_msg_put_info("requested minor out of range");
3278                 retcode = ERR_INVALID_REQUEST;
3279                 goto out;
3280         }
3281         if (adm_ctx.volume > DRBD_VOLUME_MAX) {
3282                 drbd_msg_put_info("requested volume id out of range");
3283                 retcode = ERR_INVALID_REQUEST;
3284                 goto out;
3285         }
3286
3287         /* drbd_adm_prepare made sure already
3288          * that mdev->tconn and mdev->vnr match the request. */
3289         if (adm_ctx.mdev) {
3290                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3291                         retcode = ERR_MINOR_EXISTS;
3292                 /* else: still NO_ERROR */
3293                 goto out;
3294         }
3295
3296         retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume);
3297 out:
3298         drbd_adm_finish(info, retcode);
3299         return 0;
3300 }
3301
3302 static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
3303 {
3304         if (mdev->state.disk == D_DISKLESS &&
3305             /* no need to be mdev->state.conn == C_STANDALONE &&
3306              * we may want to delete a minor from a live replication group.
3307              */
3308             mdev->state.role == R_SECONDARY) {
3309                 _drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS),
3310                                     CS_VERBOSE + CS_WAIT_COMPLETE);
3311                 idr_remove(&mdev->tconn->volumes, mdev->vnr);
3312                 idr_remove(&minors, mdev_to_minor(mdev));
3313                 destroy_workqueue(mdev->submit.wq);
3314                 del_gendisk(mdev->vdisk);
3315                 synchronize_rcu();
3316                 kref_put(&mdev->kref, &drbd_minor_destroy);
3317                 return NO_ERROR;
3318         } else
3319                 return ERR_MINOR_CONFIGURED;
3320 }
3321
3322 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info)
3323 {
3324         enum drbd_ret_code retcode;
3325
3326         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3327         if (!adm_ctx.reply_skb)
3328                 return retcode;
3329         if (retcode != NO_ERROR)
3330                 goto out;
3331
3332         retcode = adm_delete_minor(adm_ctx.mdev);
3333 out:
3334         drbd_adm_finish(info, retcode);
3335         return 0;
3336 }
3337
3338 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3339 {
3340         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
3341         struct drbd_conf *mdev;
3342         unsigned i;
3343
3344         retcode = drbd_adm_prepare(skb, info, 0);
3345         if (!adm_ctx.reply_skb)
3346                 return retcode;
3347         if (retcode != NO_ERROR)
3348                 goto out;
3349
3350         if (!adm_ctx.tconn) {
3351                 retcode = ERR_RES_NOT_KNOWN;
3352                 goto out;
3353         }
3354
3355         /* demote */
3356         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3357                 retcode = drbd_set_role(mdev, R_SECONDARY, 0);
3358                 if (retcode < SS_SUCCESS) {
3359                         drbd_msg_put_info("failed to demote");
3360                         goto out;
3361                 }
3362         }
3363
3364         retcode = conn_try_disconnect(adm_ctx.tconn, 0);
3365         if (retcode < SS_SUCCESS) {
3366                 drbd_msg_put_info("failed to disconnect");
3367                 goto out;
3368         }
3369
3370         /* detach */
3371         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3372                 retcode = adm_detach(mdev, 0);
3373                 if (retcode < SS_SUCCESS || retcode > NO_ERROR) {
3374                         drbd_msg_put_info("failed to detach");
3375                         goto out;
3376                 }
3377         }
3378
3379         /* If we reach this, all volumes (of this tconn) are Secondary,
3380          * Disconnected, Diskless, aka Unconfigured. Make sure all threads have
3381          * actually stopped, state handling only does drbd_thread_stop_nowait(). */
3382         drbd_thread_stop(&adm_ctx.tconn->worker);
3383
3384         /* Now, nothing can fail anymore */
3385
3386         /* delete volumes */
3387         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3388                 retcode = adm_delete_minor(mdev);
3389                 if (retcode != NO_ERROR) {
3390                         /* "can not happen" */
3391                         drbd_msg_put_info("failed to delete volume");
3392                         goto out;
3393                 }
3394         }
3395
3396         /* delete connection */
3397         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3398                 list_del_rcu(&adm_ctx.tconn->all_tconn);
3399                 synchronize_rcu();
3400                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3401
3402                 retcode = NO_ERROR;
3403         } else {
3404                 /* "can not happen" */
3405                 retcode = ERR_RES_IN_USE;
3406                 drbd_msg_put_info("failed to delete connection");
3407         }
3408         goto out;
3409 out:
3410         drbd_adm_finish(info, retcode);
3411         return 0;
3412 }
3413
3414 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
3415 {
3416         enum drbd_ret_code retcode;
3417
3418         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3419         if (!adm_ctx.reply_skb)
3420                 return retcode;
3421         if (retcode != NO_ERROR)
3422                 goto out;
3423
3424         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3425                 list_del_rcu(&adm_ctx.tconn->all_tconn);
3426                 synchronize_rcu();
3427                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3428
3429                 retcode = NO_ERROR;
3430         } else {
3431                 retcode = ERR_RES_IN_USE;
3432         }
3433
3434         if (retcode == NO_ERROR)
3435                 drbd_thread_stop(&adm_ctx.tconn->worker);
3436 out:
3437         drbd_adm_finish(info, retcode);
3438         return 0;
3439 }
3440
3441 void drbd_bcast_event(struct drbd_conf *mdev, const struct sib_info *sib)
3442 {
3443         static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3444         struct sk_buff *msg;
3445         struct drbd_genlmsghdr *d_out;
3446         unsigned seq;
3447         int err = -ENOMEM;
3448
3449         if (sib->sib_reason == SIB_SYNC_PROGRESS) {
3450                 if (time_after(jiffies, mdev->rs_last_bcast + HZ))
3451                         mdev->rs_last_bcast = jiffies;
3452                 else
3453                         return;
3454         }
3455
3456         seq = atomic_inc_return(&drbd_genl_seq);
3457         msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3458         if (!msg)
3459                 goto failed;
3460
3461         err = -EMSGSIZE;
3462         d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3463         if (!d_out) /* cannot happen, but anyways. */
3464                 goto nla_put_failure;
3465         d_out->minor = mdev_to_minor(mdev);
3466         d_out->ret_code = NO_ERROR;
3467
3468         if (nla_put_status_info(msg, mdev, sib))
3469                 goto nla_put_failure;
3470         genlmsg_end(msg, d_out);
3471         err = drbd_genl_multicast_events(msg, 0);
3472         /* msg has been consumed or freed in netlink_broadcast() */
3473         if (err && err != -ESRCH)
3474                 goto failed;
3475
3476         return;
3477
3478 nla_put_failure:
3479         nlmsg_free(msg);
3480 failed:
3481         dev_err(DEV, "Error %d while broadcasting event. "
3482                         "Event seq:%u sib_reason:%u\n",
3483                         err, seq, sib->sib_reason);
3484 }