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 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/module.h>
  29 #include <linux/drbd.h>
  30 #include <linux/in.h>
  31 #include <linux/fs.h>
  32 #include <linux/file.h>
  33 #include <linux/slab.h>
  34 #include <linux/blkpg.h>
  35 #include <linux/cpumask.h>
  36 #include "drbd_int.h"
  37 #include "drbd_protocol.h"
  38 #include "drbd_req.h"
  39 #include <asm/unaligned.h>
  40 #include <linux/drbd_limits.h>
  41 #include <linux/kthread.h>
  42
  43 #include <net/genetlink.h>
  44
  45 /* .doit */
  46 // int drbd_adm_create_resource(struct sk_buff *skb, struct genl_info *info);
  47 // int drbd_adm_delete_resource(struct sk_buff *skb, struct genl_info *info);
  48
  49 int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info);
  50 int drbd_adm_del_minor(struct sk_buff *skb, struct genl_info *info);
  51
  52 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info);
  53 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info);
  54 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info);
  55
  56 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info);
  57 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info);
  58 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info);
  59 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info);
  60 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info);
  61 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info);
  62 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info);
  63 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info);
  64 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info);
  65 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info);
  66 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info);
  67 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info);
  68 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info);
  69 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info);
  70 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info);
  71 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info);
  72 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info);
  73 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info);
  74 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info);
  75 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info);
  76 /* .dumpit */
  77 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb);
  78
  79 #include <linux/drbd_genl_api.h>
  80 #include "drbd_nla.h"
  81 #include <linux/genl_magic_func.h>
  82
  83 /* used blkdev_get_by_path, to claim our meta data device(s) */
  84 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
  85
  86 static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
  87 {
  88         genlmsg_end(skb, genlmsg_data(nlmsg_data(nlmsg_hdr(skb))));
  89         if (genlmsg_reply(skb, info))
  90                 pr_err("error sending genl reply\n");
  91 }
  92
  93 /* Used on a fresh "drbd_adm_prepare"d reply_skb, this cannot fail: The only
  94  * reason it could fail was no space in skb, and there are 4k available. */
  95 static int drbd_msg_put_info(struct sk_buff *skb, const char *info)
  96 {
  97         struct nlattr *nla;
  98         int err = -EMSGSIZE;
  99
 100         if (!info || !info[0])
 101                 return 0;
 102
 103         nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
 104         if (!nla)
 105                 return err;
 106
 107         err = nla_put_string(skb, T_info_text, info);
 108         if (err) {
 109                 nla_nest_cancel(skb, nla);
 110                 return err;
 111         } else
 112                 nla_nest_end(skb, nla);
 113         return 0;
 114 }
 115
 116 /* This would be a good candidate for a "pre_doit" hook,
 117  * and per-family private info->pointers.
 118  * But we need to stay compatible with older kernels.
 119  * If it returns successfully, adm_ctx members are valid.
 120  *
 121  * At this point, we still rely on the global genl_lock().
 122  * If we want to avoid that, and allow "genl_family.parallel_ops", we may need
 123  * to add additional synchronization against object destruction/modification.
 124  */
 125 #define DRBD_ADM_NEED_MINOR     1
 126 #define DRBD_ADM_NEED_RESOURCE  2
 127 #define DRBD_ADM_NEED_CONNECTION 4
 128 static int drbd_adm_prepare(struct drbd_config_context *adm_ctx,
 129         struct sk_buff *skb, struct genl_info *info, unsigned flags)
 130 {
 131         struct drbd_genlmsghdr *d_in = info->userhdr;
 132         const u8 cmd = info->genlhdr->cmd;
 133         int err;
 134
 135         memset(adm_ctx, 0, sizeof(*adm_ctx));
 136
 137         /* genl_rcv_msg only checks for CAP_NET_ADMIN on "GENL_ADMIN_PERM" :( */
 138         if (cmd != DRBD_ADM_GET_STATUS && !capable(CAP_NET_ADMIN))
 139                return -EPERM;
 140
 141         adm_ctx->reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 142         if (!adm_ctx->reply_skb) {
 143                 err = -ENOMEM;
 144                 goto fail;
 145         }
 146
 147         adm_ctx->reply_dh = genlmsg_put_reply(adm_ctx->reply_skb,
 148                                         info, &drbd_genl_family, 0, cmd);
 149         /* put of a few bytes into a fresh skb of >= 4k will always succeed.
 150          * but anyways */
 151         if (!adm_ctx->reply_dh) {
 152                 err = -ENOMEM;
 153                 goto fail;
 154         }
 155
 156         adm_ctx->reply_dh->minor = d_in->minor;
 157         adm_ctx->reply_dh->ret_code = NO_ERROR;
 158
 159         adm_ctx->volume = VOLUME_UNSPECIFIED;
 160         if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
 161                 struct nlattr *nla;
 162                 /* parse and validate only */
 163                 err = drbd_cfg_context_from_attrs(NULL, info);
 164                 if (err)
 165                         goto fail;
 166
 167                 /* It was present, and valid,
 168                  * copy it over to the reply skb. */
 169                 err = nla_put_nohdr(adm_ctx->reply_skb,
 170                                 info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
 171                                 info->attrs[DRBD_NLA_CFG_CONTEXT]);
 172                 if (err)
 173                         goto fail;
 174
 175                 /* and assign stuff to the adm_ctx */
 176                 nla = nested_attr_tb[__nla_type(T_ctx_volume)];
 177                 if (nla)
 178                         adm_ctx->volume = nla_get_u32(nla);
 179                 nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
 180                 if (nla)
 181                         adm_ctx->resource_name = nla_data(nla);
 182                 adm_ctx->my_addr = nested_attr_tb[__nla_type(T_ctx_my_addr)];
 183                 adm_ctx->peer_addr = nested_attr_tb[__nla_type(T_ctx_peer_addr)];
 184                 if ((adm_ctx->my_addr &&
 185                      nla_len(adm_ctx->my_addr) > sizeof(adm_ctx->connection->my_addr)) ||
 186                     (adm_ctx->peer_addr &&
 187                      nla_len(adm_ctx->peer_addr) > sizeof(adm_ctx->connection->peer_addr))) {
 188                         err = -EINVAL;
 189                         goto fail;
 190                 }
 191         }
 192
 193         adm_ctx->minor = d_in->minor;
 194         adm_ctx->device = minor_to_device(d_in->minor);
 195
 196         /* We are protected by the global genl_lock().
 197          * But we may explicitly drop it/retake it in drbd_adm_set_role(),
 198          * so make sure this object stays around. */
 199         if (adm_ctx->device)
 200                 kref_get(&adm_ctx->device->kref);
 201
 202         if (adm_ctx->resource_name) {
 203                 adm_ctx->resource = drbd_find_resource(adm_ctx->resource_name);
 204         }
 205
 206         if (!adm_ctx->device && (flags & DRBD_ADM_NEED_MINOR)) {
 207                 drbd_msg_put_info(adm_ctx->reply_skb, "unknown minor");
 208                 return ERR_MINOR_INVALID;
 209         }
 210         if (!adm_ctx->resource && (flags & DRBD_ADM_NEED_RESOURCE)) {
 211                 drbd_msg_put_info(adm_ctx->reply_skb, "unknown resource");
 212                 if (adm_ctx->resource_name)
 213                         return ERR_RES_NOT_KNOWN;
 214                 return ERR_INVALID_REQUEST;
 215         }
 216
 217         if (flags & DRBD_ADM_NEED_CONNECTION) {
 218                 if (adm_ctx->resource) {
 219                         drbd_msg_put_info(adm_ctx->reply_skb, "no resource name expected");
 220                         return ERR_INVALID_REQUEST;
 221                 }
 222                 if (adm_ctx->device) {
 223                         drbd_msg_put_info(adm_ctx->reply_skb, "no minor number expected");
 224                         return ERR_INVALID_REQUEST;
 225                 }
 226                 if (adm_ctx->my_addr && adm_ctx->peer_addr)
 227                         adm_ctx->connection = conn_get_by_addrs(nla_data(adm_ctx->my_addr),
 228                                                           nla_len(adm_ctx->my_addr),
 229                                                           nla_data(adm_ctx->peer_addr),
 230                                                           nla_len(adm_ctx->peer_addr));
 231                 if (!adm_ctx->connection) {
 232                         drbd_msg_put_info(adm_ctx->reply_skb, "unknown connection");
 233                         return ERR_INVALID_REQUEST;
 234                 }
 235         }
 236
 237         /* some more paranoia, if the request was over-determined */
 238         if (adm_ctx->device && adm_ctx->resource &&
 239             adm_ctx->device->resource != adm_ctx->resource) {
 240                 pr_warning("request: minor=%u, resource=%s; but that minor belongs to resource %s\n",
 241                                 adm_ctx->minor, adm_ctx->resource->name,
 242                                 adm_ctx->device->resource->name);
 243                 drbd_msg_put_info(adm_ctx->reply_skb, "minor exists in different resource");
 244                 return ERR_INVALID_REQUEST;
 245         }
 246         if (adm_ctx->device &&
 247             adm_ctx->volume != VOLUME_UNSPECIFIED &&
 248             adm_ctx->volume != adm_ctx->device->vnr) {
 249                 pr_warning("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
 250                                 adm_ctx->minor, adm_ctx->volume,
 251                                 adm_ctx->device->vnr,
 252                                 adm_ctx->device->resource->name);
 253                 drbd_msg_put_info(adm_ctx->reply_skb, "minor exists as different volume");
 254                 return ERR_INVALID_REQUEST;
 255         }
 256
 257         /* still, provide adm_ctx->resource always, if possible. */
 258         if (!adm_ctx->resource) {
 259                 adm_ctx->resource = adm_ctx->device ? adm_ctx->device->resource
 260                         : adm_ctx->connection ? adm_ctx->connection->resource : NULL;
 261                 if (adm_ctx->resource)
 262                         kref_get(&adm_ctx->resource->kref);
 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 drbd_config_context *adm_ctx,
 274         struct genl_info *info, int retcode)
 275 {
 276         if (adm_ctx->device) {
 277                 kref_put(&adm_ctx->device->kref, drbd_destroy_device);
 278                 adm_ctx->device = NULL;
 279         }
 280         if (adm_ctx->connection) {
 281                 kref_put(&adm_ctx->connection->kref, &drbd_destroy_connection);
 282                 adm_ctx->connection = NULL;
 283         }
 284         if (adm_ctx->resource) {
 285                 kref_put(&adm_ctx->resource->kref, drbd_destroy_resource);
 286                 adm_ctx->resource = NULL;
 287         }
 288
 289         if (!adm_ctx->reply_skb)
 290                 return -ENOMEM;
 291
 292         adm_ctx->reply_dh->ret_code = retcode;
 293         drbd_adm_send_reply(adm_ctx->reply_skb, info);
 294         return 0;
 295 }
 296
 297 static void setup_khelper_env(struct drbd_connection *connection, char **envp)
 298 {
 299         char *afs;
 300
 301         /* FIXME: A future version will not allow this case. */
 302         if (connection->my_addr_len == 0 || connection->peer_addr_len == 0)
 303                 return;
 304
 305         switch (((struct sockaddr *)&connection->peer_addr)->sa_family) {
 306         case AF_INET6:
 307                 afs = "ipv6";
 308                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
 309                          &((struct sockaddr_in6 *)&connection->peer_addr)->sin6_addr);
 310                 break;
 311         case AF_INET:
 312                 afs = "ipv4";
 313                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 314                          &((struct sockaddr_in *)&connection->peer_addr)->sin_addr);
 315                 break;
 316         default:
 317                 afs = "ssocks";
 318                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 319                          &((struct sockaddr_in *)&connection->peer_addr)->sin_addr);
 320         }
 321         snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
 322 }
 323
 324 int drbd_khelper(struct drbd_device *device, char *cmd)
 325 {
 326         char *envp[] = { "HOME=/",
 327                         "TERM=linux",
 328                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 329                          (char[20]) { }, /* address family */
 330                          (char[60]) { }, /* address */
 331                         NULL };
 332         char mb[12];
 333         char *argv[] = {usermode_helper, cmd, mb, NULL };
 334         struct drbd_connection *connection = first_peer_device(device)->connection;
 335         struct sib_info sib;
 336         int ret;
 337
 338         if (current == connection->worker.task)
 339                 set_bit(CALLBACK_PENDING, &connection->flags);
 340
 341         snprintf(mb, 12, "minor-%d", device_to_minor(device));
 342         setup_khelper_env(connection, envp);
 343
 344         /* The helper may take some time.
 345          * write out any unsynced meta data changes now */
 346         drbd_md_sync(device);
 347
 348         drbd_info(device, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
 349         sib.sib_reason = SIB_HELPER_PRE;
 350         sib.helper_name = cmd;
 351         drbd_bcast_event(device, &sib);
 352         ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
 353         if (ret)
 354                 drbd_warn(device, "helper command: %s %s %s exit code %u (0x%x)\n",
 355                                 usermode_helper, cmd, mb,
 356                                 (ret >> 8) & 0xff, ret);
 357         else
 358                 drbd_info(device, "helper command: %s %s %s exit code %u (0x%x)\n",
 359                                 usermode_helper, cmd, mb,
 360                                 (ret >> 8) & 0xff, ret);
 361         sib.sib_reason = SIB_HELPER_POST;
 362         sib.helper_exit_code = ret;
 363         drbd_bcast_event(device, &sib);
 364
 365         if (current == connection->worker.task)
 366                 clear_bit(CALLBACK_PENDING, &connection->flags);
 367
 368         if (ret < 0) /* Ignore any ERRNOs we got. */
 369                 ret = 0;
 370
 371         return ret;
 372 }
 373
 374 static int conn_khelper(struct drbd_connection *connection, char *cmd)
 375 {
 376         char *envp[] = { "HOME=/",
 377                         "TERM=linux",
 378                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 379                          (char[20]) { }, /* address family */
 380                          (char[60]) { }, /* address */
 381                         NULL };
 382         char *resource_name = connection->resource->name;
 383         char *argv[] = {usermode_helper, cmd, resource_name, NULL };
 384         int ret;
 385
 386         setup_khelper_env(connection, envp);
 387         conn_md_sync(connection);
 388
 389         drbd_info(connection, "helper command: %s %s %s\n", usermode_helper, cmd, resource_name);
 390         /* TODO: conn_bcast_event() ?? */
 391
 392         ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
 393         if (ret)
 394                 drbd_warn(connection, "helper command: %s %s %s exit code %u (0x%x)\n",
 395                           usermode_helper, cmd, resource_name,
 396                           (ret >> 8) & 0xff, ret);
 397         else
 398                 drbd_info(connection, "helper command: %s %s %s exit code %u (0x%x)\n",
 399                           usermode_helper, cmd, resource_name,
 400                           (ret >> 8) & 0xff, ret);
 401         /* TODO: conn_bcast_event() ?? */
 402
 403         if (ret < 0) /* Ignore any ERRNOs we got. */
 404                 ret = 0;
 405
 406         return ret;
 407 }
 408
 409 static enum drbd_fencing_p highest_fencing_policy(struct drbd_connection *connection)
 410 {
 411         enum drbd_fencing_p fp = FP_NOT_AVAIL;
 412         struct drbd_peer_device *peer_device;
 413         int vnr;
 414
 415         rcu_read_lock();
 416         idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
 417                 struct drbd_device *device = peer_device->device;
 418                 if (get_ldev_if_state(device, D_CONSISTENT)) {
 419                         struct disk_conf *disk_conf =
 420                                 rcu_dereference(peer_device->device->ldev->disk_conf);
 421                         fp = max_t(enum drbd_fencing_p, fp, disk_conf->fencing);
 422                         put_ldev(device);
 423                 }
 424         }
 425         rcu_read_unlock();
 426
 427         if (fp == FP_NOT_AVAIL) {
 428                 /* IO Suspending works on the whole resource.
 429                    Do it only for one device. */
 430                 vnr = 0;
 431                 peer_device = idr_get_next(&connection->peer_devices, &vnr);
 432                 drbd_change_state(peer_device->device, CS_VERBOSE | CS_HARD, NS(susp_fen, 0));
 433         }
 434
 435         return fp;
 436 }
 437
 438 bool conn_try_outdate_peer(struct drbd_connection *connection)
 439 {
 440         unsigned int connect_cnt;
 441         union drbd_state mask = { };
 442         union drbd_state val = { };
 443         enum drbd_fencing_p fp;
 444         char *ex_to_string;
 445         int r;
 446
 447         spin_lock_irq(&connection->resource->req_lock);
 448         if (connection->cstate >= C_WF_REPORT_PARAMS) {
 449                 drbd_err(connection, "Expected cstate < C_WF_REPORT_PARAMS\n");
 450                 spin_unlock_irq(&connection->resource->req_lock);
 451                 return false;
 452         }
 453
 454         connect_cnt = connection->connect_cnt;
 455         spin_unlock_irq(&connection->resource->req_lock);
 456
 457         fp = highest_fencing_policy(connection);
 458         switch (fp) {
 459         case FP_NOT_AVAIL:
 460                 drbd_warn(connection, "Not fencing peer, I'm not even Consistent myself.\n");
 461                 goto out;
 462         case FP_DONT_CARE:
 463                 return true;
 464         default: ;
 465         }
 466
 467         r = conn_khelper(connection, "fence-peer");
 468
 469         switch ((r>>8) & 0xff) {
 470         case 3: /* peer is inconsistent */
 471                 ex_to_string = "peer is inconsistent or worse";
 472                 mask.pdsk = D_MASK;
 473                 val.pdsk = D_INCONSISTENT;
 474                 break;
 475         case 4: /* peer got outdated, or was already outdated */
 476                 ex_to_string = "peer was fenced";
 477                 mask.pdsk = D_MASK;
 478                 val.pdsk = D_OUTDATED;
 479                 break;
 480         case 5: /* peer was down */
 481                 if (conn_highest_disk(connection) == D_UP_TO_DATE) {
 482                         /* we will(have) create(d) a new UUID anyways... */
 483                         ex_to_string = "peer is unreachable, assumed to be dead";
 484                         mask.pdsk = D_MASK;
 485                         val.pdsk = D_OUTDATED;
 486                 } else {
 487                         ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
 488                 }
 489                 break;
 490         case 6: /* Peer is primary, voluntarily outdate myself.
 491                  * This is useful when an unconnected R_SECONDARY is asked to
 492                  * become R_PRIMARY, but finds the other peer being active. */
 493                 ex_to_string = "peer is active";
 494                 drbd_warn(connection, "Peer is primary, outdating myself.\n");
 495                 mask.disk = D_MASK;
 496                 val.disk = D_OUTDATED;
 497                 break;
 498         case 7:
 499                 if (fp != FP_STONITH)
 500                         drbd_err(connection, "fence-peer() = 7 && fencing != Stonith !!!\n");
 501                 ex_to_string = "peer was stonithed";
 502                 mask.pdsk = D_MASK;
 503                 val.pdsk = D_OUTDATED;
 504                 break;
 505         default:
 506                 /* The script is broken ... */
 507                 drbd_err(connection, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
 508                 return false; /* Eventually leave IO frozen */
 509         }
 510
 511         drbd_info(connection, "fence-peer helper returned %d (%s)\n",
 512                   (r>>8) & 0xff, ex_to_string);
 513
 514  out:
 515
 516         /* Not using
 517            conn_request_state(connection, mask, val, CS_VERBOSE);
 518            here, because we might were able to re-establish the connection in the
 519            meantime. */
 520         spin_lock_irq(&connection->resource->req_lock);
 521         if (connection->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &connection->flags)) {
 522                 if (connection->connect_cnt != connect_cnt)
 523                         /* In case the connection was established and droped
 524                            while the fence-peer handler was running, ignore it */
 525                         drbd_info(connection, "Ignoring fence-peer exit code\n");
 526                 else
 527                         _conn_request_state(connection, mask, val, CS_VERBOSE);
 528         }
 529         spin_unlock_irq(&connection->resource->req_lock);
 530
 531         return conn_highest_pdsk(connection) <= D_OUTDATED;
 532 }
 533
 534 static int _try_outdate_peer_async(void *data)
 535 {
 536         struct drbd_connection *connection = (struct drbd_connection *)data;
 537
 538         conn_try_outdate_peer(connection);
 539
 540         kref_put(&connection->kref, drbd_destroy_connection);
 541         return 0;
 542 }
 543
 544 void conn_try_outdate_peer_async(struct drbd_connection *connection)
 545 {
 546         struct task_struct *opa;
 547
 548         kref_get(&connection->kref);
 549         /* We may just have force_sig()'ed this thread
 550          * to get it out of some blocking network function.
 551          * Clear signals; otherwise kthread_run(), which internally uses
 552          * wait_on_completion_killable(), will mistake our pending signal
 553          * for a new fatal signal and fail. */
 554         flush_signals(current);
 555         opa = kthread_run(_try_outdate_peer_async, connection, "drbd_async_h");
 556         if (IS_ERR(opa)) {
 557                 drbd_err(connection, "out of mem, failed to invoke fence-peer helper\n");
 558                 kref_put(&connection->kref, drbd_destroy_connection);
 559         }
 560 }
 561
 562 enum drbd_state_rv
 563 drbd_set_role(struct drbd_device *const device, enum drbd_role new_role, int force)
 564 {
 565         struct drbd_peer_device *const peer_device = first_peer_device(device);
 566         struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL;
 567         const int max_tries = 4;
 568         enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
 569         struct net_conf *nc;
 570         int try = 0;
 571         int forced = 0;
 572         union drbd_state mask, val;
 573
 574         if (new_role == R_PRIMARY) {
 575                 struct drbd_connection *connection;
 576
 577                 /* Detect dead peers as soon as possible.  */
 578
 579                 rcu_read_lock();
 580                 for_each_connection(connection, device->resource)
 581                         request_ping(connection);
 582                 rcu_read_unlock();
 583         }
 584
 585         mutex_lock(device->state_mutex);
 586
 587         mask.i = 0; mask.role = R_MASK;
 588         val.i  = 0; val.role  = new_role;
 589
 590         while (try++ < max_tries) {
 591                 rv = _drbd_request_state_holding_state_mutex(device, mask, val, CS_WAIT_COMPLETE);
 592
 593                 /* in case we first succeeded to outdate,
 594                  * but now suddenly could establish a connection */
 595                 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
 596                         val.pdsk = 0;
 597                         mask.pdsk = 0;
 598                         continue;
 599                 }
 600
 601                 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
 602                     (device->state.disk < D_UP_TO_DATE &&
 603                      device->state.disk >= D_INCONSISTENT)) {
 604                         mask.disk = D_MASK;
 605                         val.disk  = D_UP_TO_DATE;
 606                         forced = 1;
 607                         continue;
 608                 }
 609
 610                 if (rv == SS_NO_UP_TO_DATE_DISK &&
 611                     device->state.disk == D_CONSISTENT && mask.pdsk == 0) {
 612                         D_ASSERT(device, device->state.pdsk == D_UNKNOWN);
 613
 614                         if (conn_try_outdate_peer(connection)) {
 615                                 val.disk = D_UP_TO_DATE;
 616                                 mask.disk = D_MASK;
 617                         }
 618                         continue;
 619                 }
 620
 621                 if (rv == SS_NOTHING_TO_DO)
 622                         goto out;
 623                 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
 624                         if (!conn_try_outdate_peer(connection) && force) {
 625                                 drbd_warn(device, "Forced into split brain situation!\n");
 626                                 mask.pdsk = D_MASK;
 627                                 val.pdsk  = D_OUTDATED;
 628
 629                         }
 630                         continue;
 631                 }
 632                 if (rv == SS_TWO_PRIMARIES) {
 633                         /* Maybe the peer is detected as dead very soon...
 634                            retry at most once more in this case. */
 635                         int timeo;
 636                         rcu_read_lock();
 637                         nc = rcu_dereference(connection->net_conf);
 638                         timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
 639                         rcu_read_unlock();
 640                         schedule_timeout_interruptible(timeo);
 641                         if (try < max_tries)
 642                                 try = max_tries - 1;
 643                         continue;
 644                 }
 645                 if (rv < SS_SUCCESS) {
 646                         rv = _drbd_request_state(device, mask, val,
 647                                                 CS_VERBOSE + CS_WAIT_COMPLETE);
 648                         if (rv < SS_SUCCESS)
 649                                 goto out;
 650                 }
 651                 break;
 652         }
 653
 654         if (rv < SS_SUCCESS)
 655                 goto out;
 656
 657         if (forced)
 658                 drbd_warn(device, "Forced to consider local data as UpToDate!\n");
 659
 660         /* Wait until nothing is on the fly :) */
 661         wait_event(device->misc_wait, atomic_read(&device->ap_pending_cnt) == 0);
 662
 663         /* FIXME also wait for all pending P_BARRIER_ACK? */
 664
 665         if (new_role == R_SECONDARY) {
 666                 if (get_ldev(device)) {
 667                         device->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
 668                         put_ldev(device);
 669                 }
 670         } else {
 671                 mutex_lock(&device->resource->conf_update);
 672                 nc = connection->net_conf;
 673                 if (nc)
 674                         nc->discard_my_data = 0; /* without copy; single bit op is atomic */
 675                 mutex_unlock(&device->resource->conf_update);
 676
 677                 if (get_ldev(device)) {
 678                         if (((device->state.conn < C_CONNECTED ||
 679                                device->state.pdsk <= D_FAILED)
 680                               && device->ldev->md.uuid[UI_BITMAP] == 0) || forced)
 681                                 drbd_uuid_new_current(device);
 682
 683                         device->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
 684                         put_ldev(device);
 685                 }
 686         }
 687
 688         /* writeout of activity log covered areas of the bitmap
 689          * to stable storage done in after state change already */
 690
 691         if (device->state.conn >= C_WF_REPORT_PARAMS) {
 692                 /* if this was forced, we should consider sync */
 693                 if (forced)
 694                         drbd_send_uuids(peer_device);
 695                 drbd_send_current_state(peer_device);
 696         }
 697
 698         drbd_md_sync(device);
 699         set_disk_ro(device->vdisk, new_role == R_SECONDARY);
 700         kobject_uevent(&disk_to_dev(device->vdisk)->kobj, KOBJ_CHANGE);
 701 out:
 702         mutex_unlock(device->state_mutex);
 703         return rv;
 704 }
 705
 706 static const char *from_attrs_err_to_txt(int err)
 707 {
 708         return  err == -ENOMSG ? "required attribute missing" :
 709                 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
 710                 err == -EEXIST ? "can not change invariant setting" :
 711                 "invalid attribute value";
 712 }
 713
 714 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
 715 {
 716         struct drbd_config_context adm_ctx;
 717         struct set_role_parms parms;
 718         int err;
 719         enum drbd_ret_code retcode;
 720
 721         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
 722         if (!adm_ctx.reply_skb)
 723                 return retcode;
 724         if (retcode != NO_ERROR)
 725                 goto out;
 726
 727         memset(&parms, 0, sizeof(parms));
 728         if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
 729                 err = set_role_parms_from_attrs(&parms, info);
 730                 if (err) {
 731                         retcode = ERR_MANDATORY_TAG;
 732                         drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
 733                         goto out;
 734                 }
 735         }
 736         genl_unlock();
 737         mutex_lock(&adm_ctx.resource->adm_mutex);
 738
 739         if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
 740                 retcode = drbd_set_role(adm_ctx.device, R_PRIMARY, parms.assume_uptodate);
 741         else
 742                 retcode = drbd_set_role(adm_ctx.device, R_SECONDARY, 0);
 743
 744         mutex_unlock(&adm_ctx.resource->adm_mutex);
 745         genl_lock();
 746 out:
 747         drbd_adm_finish(&adm_ctx, info, retcode);
 748         return 0;
 749 }
 750
 751 /* Initializes the md.*_offset members, so we are able to find
 752  * the on disk meta data.
 753  *
 754  * We currently have two possible layouts:
 755  * external:
 756  *   |----------- md_size_sect ------------------|
 757  *   [ 4k superblock ][ activity log ][  Bitmap  ]
 758  *   | al_offset == 8 |
 759  *   | bm_offset = al_offset + X      |
 760  *  ==> bitmap sectors = md_size_sect - bm_offset
 761  *
 762  * internal:
 763  *            |----------- md_size_sect ------------------|
 764  * [data.....][  Bitmap  ][ activity log ][ 4k superblock ]
 765  *                        | al_offset < 0 |
 766  *            | bm_offset = al_offset - Y |
 767  *  ==> bitmap sectors = Y = al_offset - bm_offset
 768  *
 769  *  Activity log size used to be fixed 32kB,
 770  *  but is about to become configurable.
 771  */
 772 static void drbd_md_set_sector_offsets(struct drbd_device *device,
 773                                        struct drbd_backing_dev *bdev)
 774 {
 775         sector_t md_size_sect = 0;
 776         unsigned int al_size_sect = bdev->md.al_size_4k * 8;
 777
 778         bdev->md.md_offset = drbd_md_ss(bdev);
 779
 780         switch (bdev->md.meta_dev_idx) {
 781         default:
 782                 /* v07 style fixed size indexed meta data */
 783                 bdev->md.md_size_sect = MD_128MB_SECT;
 784                 bdev->md.al_offset = MD_4kB_SECT;
 785                 bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
 786                 break;
 787         case DRBD_MD_INDEX_FLEX_EXT:
 788                 /* just occupy the full device; unit: sectors */
 789                 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
 790                 bdev->md.al_offset = MD_4kB_SECT;
 791                 bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
 792                 break;
 793         case DRBD_MD_INDEX_INTERNAL:
 794         case DRBD_MD_INDEX_FLEX_INT:
 795                 /* al size is still fixed */
 796                 bdev->md.al_offset = -al_size_sect;
 797                 /* we need (slightly less than) ~ this much bitmap sectors: */
 798                 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
 799                 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
 800                 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
 801                 md_size_sect = ALIGN(md_size_sect, 8);
 802
 803                 /* plus the "drbd meta data super block",
 804                  * and the activity log; */
 805                 md_size_sect += MD_4kB_SECT + al_size_sect;
 806
 807                 bdev->md.md_size_sect = md_size_sect;
 808                 /* bitmap offset is adjusted by 'super' block size */
 809                 bdev->md.bm_offset   = -md_size_sect + MD_4kB_SECT;
 810                 break;
 811         }
 812 }
 813
 814 /* input size is expected to be in KB */
 815 char *ppsize(char *buf, unsigned long long size)
 816 {
 817         /* Needs 9 bytes at max including trailing NUL:
 818          * -1ULL ==> "16384 EB" */
 819         static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
 820         int base = 0;
 821         while (size >= 10000 && base < sizeof(units)-1) {
 822                 /* shift + round */
 823                 size = (size >> 10) + !!(size & (1<<9));
 824                 base++;
 825         }
 826         sprintf(buf, "%u %cB", (unsigned)size, units[base]);
 827
 828         return buf;
 829 }
 830
 831 /* there is still a theoretical deadlock when called from receiver
 832  * on an D_INCONSISTENT R_PRIMARY:
 833  *  remote READ does inc_ap_bio, receiver would need to receive answer
 834  *  packet from remote to dec_ap_bio again.
 835  *  receiver receive_sizes(), comes here,
 836  *  waits for ap_bio_cnt == 0. -> deadlock.
 837  * but this cannot happen, actually, because:
 838  *  R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
 839  *  (not connected, or bad/no disk on peer):
 840  *  see drbd_fail_request_early, ap_bio_cnt is zero.
 841  *  R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
 842  *  peer may not initiate a resize.
 843  */
 844 /* Note these are not to be confused with
 845  * drbd_adm_suspend_io/drbd_adm_resume_io,
 846  * which are (sub) state changes triggered by admin (drbdsetup),
 847  * and can be long lived.
 848  * This changes an device->flag, is triggered by drbd internals,
 849  * and should be short-lived. */
 850 void drbd_suspend_io(struct drbd_device *device)
 851 {
 852         set_bit(SUSPEND_IO, &device->flags);
 853         if (drbd_suspended(device))
 854                 return;
 855         wait_event(device->misc_wait, !atomic_read(&device->ap_bio_cnt));
 856 }
 857
 858 void drbd_resume_io(struct drbd_device *device)
 859 {
 860         clear_bit(SUSPEND_IO, &device->flags);
 861         wake_up(&device->misc_wait);
 862 }
 863
 864 /**
 865  * drbd_determine_dev_size() -  Sets the right device size obeying all constraints
 866  * @device:     DRBD device.
 867  *
 868  * Returns 0 on success, negative return values indicate errors.
 869  * You should call drbd_md_sync() after calling this function.
 870  */
 871 enum determine_dev_size
 872 drbd_determine_dev_size(struct drbd_device *device, enum dds_flags flags, struct resize_parms *rs) __must_hold(local)
 873 {
 874         sector_t prev_first_sect, prev_size; /* previous meta location */
 875         sector_t la_size_sect, u_size;
 876         struct drbd_md *md = &device->ldev->md;
 877         u32 prev_al_stripe_size_4k;
 878         u32 prev_al_stripes;
 879         sector_t size;
 880         char ppb[10];
 881         void *buffer;
 882
 883         int md_moved, la_size_changed;
 884         enum determine_dev_size rv = DS_UNCHANGED;
 885
 886         /* race:
 887          * application request passes inc_ap_bio,
 888          * but then cannot get an AL-reference.
 889          * this function later may wait on ap_bio_cnt == 0. -> deadlock.
 890          *
 891          * to avoid that:
 892          * Suspend IO right here.
 893          * still lock the act_log to not trigger ASSERTs there.
 894          */
 895         drbd_suspend_io(device);
 896         buffer = drbd_md_get_buffer(device, __func__); /* Lock meta-data IO */
 897         if (!buffer) {
 898                 drbd_resume_io(device);
 899                 return DS_ERROR;
 900         }
 901
 902         /* no wait necessary anymore, actually we could assert that */
 903         wait_event(device->al_wait, lc_try_lock(device->act_log));
 904
 905         prev_first_sect = drbd_md_first_sector(device->ldev);
 906         prev_size = device->ldev->md.md_size_sect;
 907         la_size_sect = device->ldev->md.la_size_sect;
 908
 909         if (rs) {
 910                 /* rs is non NULL if we should change the AL layout only */
 911
 912                 prev_al_stripes = md->al_stripes;
 913                 prev_al_stripe_size_4k = md->al_stripe_size_4k;
 914
 915                 md->al_stripes = rs->al_stripes;
 916                 md->al_stripe_size_4k = rs->al_stripe_size / 4;
 917                 md->al_size_4k = (u64)rs->al_stripes * rs->al_stripe_size / 4;
 918         }
 919
 920         drbd_md_set_sector_offsets(device, device->ldev);
 921
 922         rcu_read_lock();
 923         u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
 924         rcu_read_unlock();
 925         size = drbd_new_dev_size(device, device->ldev, u_size, flags & DDSF_FORCED);
 926
 927         if (size < la_size_sect) {
 928                 if (rs && u_size == 0) {
 929                         /* Remove "rs &&" later. This check should always be active, but
 930                            right now the receiver expects the permissive behavior */
 931                         drbd_warn(device, "Implicit shrink not allowed. "
 932                                  "Use --size=%llus for explicit shrink.\n",
 933                                  (unsigned long long)size);
 934                         rv = DS_ERROR_SHRINK;
 935                 }
 936                 if (u_size > size)
 937                         rv = DS_ERROR_SPACE_MD;
 938                 if (rv != DS_UNCHANGED)
 939                         goto err_out;
 940         }
 941
 942         if (drbd_get_capacity(device->this_bdev) != size ||
 943             drbd_bm_capacity(device) != size) {
 944                 int err;
 945                 err = drbd_bm_resize(device, size, !(flags & DDSF_NO_RESYNC));
 946                 if (unlikely(err)) {
 947                         /* currently there is only one error: ENOMEM! */
 948                         size = drbd_bm_capacity(device)>>1;
 949                         if (size == 0) {
 950                                 drbd_err(device, "OUT OF MEMORY! "
 951                                     "Could not allocate bitmap!\n");
 952                         } else {
 953                                 drbd_err(device, "BM resizing failed. "
 954                                     "Leaving size unchanged at size = %lu KB\n",
 955                                     (unsigned long)size);
 956                         }
 957                         rv = DS_ERROR;
 958                 }
 959                 /* racy, see comments above. */
 960                 drbd_set_my_capacity(device, size);
 961                 device->ldev->md.la_size_sect = size;
 962                 drbd_info(device, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
 963                      (unsigned long long)size>>1);
 964         }
 965         if (rv <= DS_ERROR)
 966                 goto err_out;
 967
 968         la_size_changed = (la_size_sect != device->ldev->md.la_size_sect);
 969
 970         md_moved = prev_first_sect != drbd_md_first_sector(device->ldev)
 971                 || prev_size       != device->ldev->md.md_size_sect;
 972
 973         if (la_size_changed || md_moved || rs) {
 974                 u32 prev_flags;
 975
 976                 /* We do some synchronous IO below, which may take some time.
 977                  * Clear the timer, to avoid scary "timer expired!" messages,
 978                  * "Superblock" is written out at least twice below, anyways. */
 979                 del_timer(&device->md_sync_timer);
 980                 drbd_al_shrink(device); /* All extents inactive. */
 981
 982                 prev_flags = md->flags;
 983                 md->flags &= ~MDF_PRIMARY_IND;
 984                 drbd_md_write(device, buffer);
 985
 986                 drbd_info(device, "Writing the whole bitmap, %s\n",
 987                          la_size_changed && md_moved ? "size changed and md moved" :
 988                          la_size_changed ? "size changed" : "md moved");
 989                 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
 990                 drbd_bitmap_io(device, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
 991                                "size changed", BM_LOCKED_MASK);
 992                 drbd_initialize_al(device, buffer);
 993
 994                 md->flags = prev_flags;
 995                 drbd_md_write(device, buffer);
 996
 997                 if (rs)
 998                         drbd_info(device, "Changed AL layout to al-stripes = %d, al-stripe-size-kB = %d\n",
 999                                   md->al_stripes, md->al_stripe_size_4k * 4);
1000         }
1001
1002         if (size > la_size_sect)
1003                 rv = la_size_sect ? DS_GREW : DS_GREW_FROM_ZERO;
1004         if (size < la_size_sect)
1005                 rv = DS_SHRUNK;
1006
1007         if (0) {
1008         err_out:
1009                 if (rs) {
1010                         md->al_stripes = prev_al_stripes;
1011                         md->al_stripe_size_4k = prev_al_stripe_size_4k;
1012                         md->al_size_4k = (u64)prev_al_stripes * prev_al_stripe_size_4k;
1013
1014                         drbd_md_set_sector_offsets(device, device->ldev);
1015                 }
1016         }
1017         lc_unlock(device->act_log);
1018         wake_up(&device->al_wait);
1019         drbd_md_put_buffer(device);
1020         drbd_resume_io(device);
1021
1022         return rv;
1023 }
1024
1025 sector_t
1026 drbd_new_dev_size(struct drbd_device *device, struct drbd_backing_dev *bdev,
1027                   sector_t u_size, int assume_peer_has_space)
1028 {
1029         sector_t p_size = device->p_size;   /* partner's disk size. */
1030         sector_t la_size_sect = bdev->md.la_size_sect; /* last agreed size. */
1031         sector_t m_size; /* my size */
1032         sector_t size = 0;
1033
1034         m_size = drbd_get_max_capacity(bdev);
1035
1036         if (device->state.conn < C_CONNECTED && assume_peer_has_space) {
1037                 drbd_warn(device, "Resize while not connected was forced by the user!\n");
1038                 p_size = m_size;
1039         }
1040
1041         if (p_size && m_size) {
1042                 size = min_t(sector_t, p_size, m_size);
1043         } else {
1044                 if (la_size_sect) {
1045                         size = la_size_sect;
1046                         if (m_size && m_size < size)
1047                                 size = m_size;
1048                         if (p_size && p_size < size)
1049                                 size = p_size;
1050                 } else {
1051                         if (m_size)
1052                                 size = m_size;
1053                         if (p_size)
1054                                 size = p_size;
1055                 }
1056         }
1057
1058         if (size == 0)
1059                 drbd_err(device, "Both nodes diskless!\n");
1060
1061         if (u_size) {
1062                 if (u_size > size)
1063                         drbd_err(device, "Requested disk size is too big (%lu > %lu)\n",
1064                             (unsigned long)u_size>>1, (unsigned long)size>>1);
1065                 else
1066                         size = u_size;
1067         }
1068
1069         return size;
1070 }
1071
1072 /**
1073  * drbd_check_al_size() - Ensures that the AL is of the right size
1074  * @device:     DRBD device.
1075  *
1076  * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
1077  * failed, and 0 on success. You should call drbd_md_sync() after you called
1078  * this function.
1079  */
1080 static int drbd_check_al_size(struct drbd_device *device, struct disk_conf *dc)
1081 {
1082         struct lru_cache *n, *t;
1083         struct lc_element *e;
1084         unsigned int in_use;
1085         int i;
1086
1087         if (device->act_log &&
1088             device->act_log->nr_elements == dc->al_extents)
1089                 return 0;
1090
1091         in_use = 0;
1092         t = device->act_log;
1093         n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
1094                 dc->al_extents, sizeof(struct lc_element), 0);
1095
1096         if (n == NULL) {
1097                 drbd_err(device, "Cannot allocate act_log lru!\n");
1098                 return -ENOMEM;
1099         }
1100         spin_lock_irq(&device->al_lock);
1101         if (t) {
1102                 for (i = 0; i < t->nr_elements; i++) {
1103                         e = lc_element_by_index(t, i);
1104                         if (e->refcnt)
1105                                 drbd_err(device, "refcnt(%d)==%d\n",
1106                                     e->lc_number, e->refcnt);
1107                         in_use += e->refcnt;
1108                 }
1109         }
1110         if (!in_use)
1111                 device->act_log = n;
1112         spin_unlock_irq(&device->al_lock);
1113         if (in_use) {
1114                 drbd_err(device, "Activity log still in use!\n");
1115                 lc_destroy(n);
1116                 return -EBUSY;
1117         } else {
1118                 if (t)
1119                         lc_destroy(t);
1120         }
1121         drbd_md_mark_dirty(device); /* we changed device->act_log->nr_elemens */
1122         return 0;
1123 }
1124
1125 static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backing_dev *bdev,
1126                                    unsigned int max_bio_size)
1127 {
1128         struct request_queue * const q = device->rq_queue;
1129         unsigned int max_hw_sectors = max_bio_size >> 9;
1130         unsigned int max_segments = 0;
1131         struct request_queue *b = NULL;
1132
1133         if (bdev) {
1134                 b = bdev->backing_bdev->bd_disk->queue;
1135
1136                 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
1137                 rcu_read_lock();
1138                 max_segments = rcu_dereference(device->ldev->disk_conf)->max_bio_bvecs;
1139                 rcu_read_unlock();
1140
1141                 blk_set_stacking_limits(&q->limits);
1142                 blk_queue_max_write_same_sectors(q, 0);
1143         }
1144
1145         blk_queue_logical_block_size(q, 512);
1146         blk_queue_max_hw_sectors(q, max_hw_sectors);
1147         /* This is the workaround for "bio would need to, but cannot, be split" */
1148         blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1149         blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
1150
1151         if (b) {
1152                 struct drbd_connection *connection = first_peer_device(device)->connection;
1153
1154                 if (blk_queue_discard(b) &&
1155                     (connection->cstate < C_CONNECTED || connection->agreed_features & FF_TRIM)) {
1156                         /* For now, don't allow more than one activity log extent worth of data
1157                          * to be discarded in one go. We may need to rework drbd_al_begin_io()
1158                          * to allow for even larger discard ranges */
1159                         blk_queue_max_discard_sectors(q, DRBD_MAX_DISCARD_SECTORS);
1160
1161                         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1162                         /* REALLY? Is stacking secdiscard "legal"? */
1163                         if (blk_queue_secdiscard(b))
1164                                 queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
1165                 } else {
1166                         blk_queue_max_discard_sectors(q, 0);
1167                         queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
1168                         queue_flag_clear_unlocked(QUEUE_FLAG_SECDISCARD, q);
1169                 }
1170
1171                 blk_queue_stack_limits(q, b);
1172
1173                 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
1174                         drbd_info(device, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
1175                                  q->backing_dev_info.ra_pages,
1176                                  b->backing_dev_info.ra_pages);
1177                         q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1178                 }
1179         }
1180 }
1181
1182 void drbd_reconsider_max_bio_size(struct drbd_device *device, struct drbd_backing_dev *bdev)
1183 {
1184         unsigned int now, new, local, peer;
1185
1186         now = queue_max_hw_sectors(device->rq_queue) << 9;
1187         local = device->local_max_bio_size; /* Eventually last known value, from volatile memory */
1188         peer = device->peer_max_bio_size; /* Eventually last known value, from meta data */
1189
1190         if (bdev) {
1191                 local = queue_max_hw_sectors(bdev->backing_bdev->bd_disk->queue) << 9;
1192                 device->local_max_bio_size = local;
1193         }
1194         local = min(local, DRBD_MAX_BIO_SIZE);
1195
1196         /* We may ignore peer limits if the peer is modern enough.
1197            Because new from 8.3.8 onwards the peer can use multiple
1198            BIOs for a single peer_request */
1199         if (device->state.conn >= C_WF_REPORT_PARAMS) {
1200                 if (first_peer_device(device)->connection->agreed_pro_version < 94)
1201                         peer = min(device->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
1202                         /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
1203                 else if (first_peer_device(device)->connection->agreed_pro_version == 94)
1204                         peer = DRBD_MAX_SIZE_H80_PACKET;
1205                 else if (first_peer_device(device)->connection->agreed_pro_version < 100)
1206                         peer = DRBD_MAX_BIO_SIZE_P95;  /* drbd 8.3.8 onwards, before 8.4.0 */
1207                 else
1208                         peer = DRBD_MAX_BIO_SIZE;
1209
1210                 /* We may later detach and re-attach on a disconnected Primary.
1211                  * Avoid this setting to jump back in that case.
1212                  * We want to store what we know the peer DRBD can handle,
1213                  * not what the peer IO backend can handle. */
1214                 if (peer > device->peer_max_bio_size)
1215                         device->peer_max_bio_size = peer;
1216         }
1217         new = min(local, peer);
1218
1219         if (device->state.role == R_PRIMARY && new < now)
1220                 drbd_err(device, "ASSERT FAILED new < now; (%u < %u)\n", new, now);
1221
1222         if (new != now)
1223                 drbd_info(device, "max BIO size = %u\n", new);
1224
1225         drbd_setup_queue_param(device, bdev, new);
1226 }
1227
1228 /* Starts the worker thread */
1229 static void conn_reconfig_start(struct drbd_connection *connection)
1230 {
1231         drbd_thread_start(&connection->worker);
1232         drbd_flush_workqueue(&connection->sender_work);
1233 }
1234
1235 /* if still unconfigured, stops worker again. */
1236 static void conn_reconfig_done(struct drbd_connection *connection)
1237 {
1238         bool stop_threads;
1239         spin_lock_irq(&connection->resource->req_lock);
1240         stop_threads = conn_all_vols_unconf(connection) &&
1241                 connection->cstate == C_STANDALONE;
1242         spin_unlock_irq(&connection->resource->req_lock);
1243         if (stop_threads) {
1244                 /* asender is implicitly stopped by receiver
1245                  * in conn_disconnect() */
1246                 drbd_thread_stop(&connection->receiver);
1247                 drbd_thread_stop(&connection->worker);
1248         }
1249 }
1250
1251 /* Make sure IO is suspended before calling this function(). */
1252 static void drbd_suspend_al(struct drbd_device *device)
1253 {
1254         int s = 0;
1255
1256         if (!lc_try_lock(device->act_log)) {
1257                 drbd_warn(device, "Failed to lock al in drbd_suspend_al()\n");
1258                 return;
1259         }
1260
1261         drbd_al_shrink(device);
1262         spin_lock_irq(&device->resource->req_lock);
1263         if (device->state.conn < C_CONNECTED)
1264                 s = !test_and_set_bit(AL_SUSPENDED, &device->flags);
1265         spin_unlock_irq(&device->resource->req_lock);
1266         lc_unlock(device->act_log);
1267
1268         if (s)
1269                 drbd_info(device, "Suspended AL updates\n");
1270 }
1271
1272
1273 static bool should_set_defaults(struct genl_info *info)
1274 {
1275         unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1276         return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1277 }
1278
1279 static unsigned int drbd_al_extents_max(struct drbd_backing_dev *bdev)
1280 {
1281         /* This is limited by 16 bit "slot" numbers,
1282          * and by available on-disk context storage.
1283          *
1284          * Also (u16)~0 is special (denotes a "free" extent).
1285          *
1286          * One transaction occupies one 4kB on-disk block,
1287          * we have n such blocks in the on disk ring buffer,
1288          * the "current" transaction may fail (n-1),
1289          * and there is 919 slot numbers context information per transaction.
1290          *
1291          * 72 transaction blocks amounts to more than 2**16 context slots,
1292          * so cap there first.
1293          */
1294         const unsigned int max_al_nr = DRBD_AL_EXTENTS_MAX;
1295         const unsigned int sufficient_on_disk =
1296                 (max_al_nr + AL_CONTEXT_PER_TRANSACTION -1)
1297                 /AL_CONTEXT_PER_TRANSACTION;
1298
1299         unsigned int al_size_4k = bdev->md.al_size_4k;
1300
1301         if (al_size_4k > sufficient_on_disk)
1302                 return max_al_nr;
1303
1304         return (al_size_4k - 1) * AL_CONTEXT_PER_TRANSACTION;
1305 }
1306
1307 static bool write_ordering_changed(struct disk_conf *a, struct disk_conf *b)
1308 {
1309         return  a->disk_barrier != b->disk_barrier ||
1310                 a->disk_flushes != b->disk_flushes ||
1311                 a->disk_drain != b->disk_drain;
1312 }
1313
1314 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1315 {
1316         struct drbd_config_context adm_ctx;
1317         enum drbd_ret_code retcode;
1318         struct drbd_device *device;
1319         struct disk_conf *new_disk_conf, *old_disk_conf;
1320         struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
1321         int err, fifo_size;
1322
1323         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
1324         if (!adm_ctx.reply_skb)
1325                 return retcode;
1326         if (retcode != NO_ERROR)
1327                 goto finish;
1328
1329         device = adm_ctx.device;
1330         mutex_lock(&adm_ctx.resource->adm_mutex);
1331
1332         /* we also need a disk
1333          * to change the options on */
1334         if (!get_ldev(device)) {
1335                 retcode = ERR_NO_DISK;
1336                 goto out;
1337         }
1338
1339         new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
1340         if (!new_disk_conf) {
1341                 retcode = ERR_NOMEM;
1342                 goto fail;
1343         }
1344
1345         mutex_lock(&device->resource->conf_update);
1346         old_disk_conf = device->ldev->disk_conf;
1347         *new_disk_conf = *old_disk_conf;
1348         if (should_set_defaults(info))
1349                 set_disk_conf_defaults(new_disk_conf);
1350
1351         err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1352         if (err && err != -ENOMSG) {
1353                 retcode = ERR_MANDATORY_TAG;
1354                 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
1355                 goto fail_unlock;
1356         }
1357
1358         if (!expect(new_disk_conf->resync_rate >= 1))
1359                 new_disk_conf->resync_rate = 1;
1360
1361         if (new_disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
1362                 new_disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
1363         if (new_disk_conf->al_extents > drbd_al_extents_max(device->ldev))
1364                 new_disk_conf->al_extents = drbd_al_extents_max(device->ldev);
1365
1366         if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1367                 new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1368
1369         fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1370         if (fifo_size != device->rs_plan_s->size) {
1371                 new_plan = fifo_alloc(fifo_size);
1372                 if (!new_plan) {
1373                         drbd_err(device, "kmalloc of fifo_buffer failed");
1374                         retcode = ERR_NOMEM;
1375                         goto fail_unlock;
1376                 }
1377         }
1378
1379         drbd_suspend_io(device);
1380         wait_event(device->al_wait, lc_try_lock(device->act_log));
1381         drbd_al_shrink(device);
1382         err = drbd_check_al_size(device, new_disk_conf);
1383         lc_unlock(device->act_log);
1384         wake_up(&device->al_wait);
1385         drbd_resume_io(device);
1386
1387         if (err) {
1388                 retcode = ERR_NOMEM;
1389                 goto fail_unlock;
1390         }
1391
1392         write_lock_irq(&global_state_lock);
1393         retcode = drbd_resync_after_valid(device, new_disk_conf->resync_after);
1394         if (retcode == NO_ERROR) {
1395                 rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
1396                 drbd_resync_after_changed(device);
1397         }
1398         write_unlock_irq(&global_state_lock);
1399
1400         if (retcode != NO_ERROR)
1401                 goto fail_unlock;
1402
1403         if (new_plan) {
1404                 old_plan = device->rs_plan_s;
1405                 rcu_assign_pointer(device->rs_plan_s, new_plan);
1406         }
1407
1408         mutex_unlock(&device->resource->conf_update);
1409
1410         if (new_disk_conf->al_updates)
1411                 device->ldev->md.flags &= ~MDF_AL_DISABLED;
1412         else
1413                 device->ldev->md.flags |= MDF_AL_DISABLED;
1414
1415         if (new_disk_conf->md_flushes)
1416                 clear_bit(MD_NO_FUA, &device->flags);
1417         else
1418                 set_bit(MD_NO_FUA, &device->flags);
1419
1420         if (write_ordering_changed(old_disk_conf, new_disk_conf))
1421                 drbd_bump_write_ordering(device->resource, NULL, WO_BDEV_FLUSH);
1422
1423         drbd_md_sync(device);
1424
1425         if (device->state.conn >= C_CONNECTED) {
1426                 struct drbd_peer_device *peer_device;
1427
1428                 for_each_peer_device(peer_device, device)
1429                         drbd_send_sync_param(peer_device);
1430         }
1431
1432         synchronize_rcu();
1433         kfree(old_disk_conf);
1434         kfree(old_plan);
1435         mod_timer(&device->request_timer, jiffies + HZ);
1436         goto success;
1437
1438 fail_unlock:
1439         mutex_unlock(&device->resource->conf_update);
1440  fail:
1441         kfree(new_disk_conf);
1442         kfree(new_plan);
1443 success:
1444         put_ldev(device);
1445  out:
1446         mutex_unlock(&adm_ctx.resource->adm_mutex);
1447  finish:
1448         drbd_adm_finish(&adm_ctx, info, retcode);
1449         return 0;
1450 }
1451
1452 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1453 {
1454         struct drbd_config_context adm_ctx;
1455         struct drbd_device *device;
1456         struct drbd_peer_device *peer_device;
1457         struct drbd_connection *connection;
1458         int err;
1459         enum drbd_ret_code retcode;
1460         enum determine_dev_size dd;
1461         sector_t max_possible_sectors;
1462         sector_t min_md_device_sectors;
1463         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1464         struct disk_conf *new_disk_conf = NULL;
1465         struct block_device *bdev;
1466         struct lru_cache *resync_lru = NULL;
1467         struct fifo_buffer *new_plan = NULL;
1468         union drbd_state ns, os;
1469         enum drbd_state_rv rv;
1470         struct net_conf *nc;
1471
1472         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
1473         if (!adm_ctx.reply_skb)
1474                 return retcode;
1475         if (retcode != NO_ERROR)
1476                 goto finish;
1477
1478         device = adm_ctx.device;
1479         mutex_lock(&adm_ctx.resource->adm_mutex);
1480         peer_device = first_peer_device(device);
1481         connection = peer_device->connection;
1482         conn_reconfig_start(connection);
1483
1484         /* if you want to reconfigure, please tear down first */
1485         if (device->state.disk > D_DISKLESS) {
1486                 retcode = ERR_DISK_CONFIGURED;
1487                 goto fail;
1488         }
1489         /* It may just now have detached because of IO error.  Make sure
1490          * drbd_ldev_destroy is done already, we may end up here very fast,
1491          * e.g. if someone calls attach from the on-io-error handler,
1492          * to realize a "hot spare" feature (not that I'd recommend that) */
1493         wait_event(device->misc_wait, !test_bit(GOING_DISKLESS, &device->flags));
1494
1495         /* make sure there is no leftover from previous force-detach attempts */
1496         clear_bit(FORCE_DETACH, &device->flags);
1497         clear_bit(WAS_IO_ERROR, &device->flags);
1498         clear_bit(WAS_READ_ERROR, &device->flags);
1499
1500         /* and no leftover from previously aborted resync or verify, either */
1501         device->rs_total = 0;
1502         device->rs_failed = 0;
1503         atomic_set(&device->rs_pending_cnt, 0);
1504
1505         /* allocation not in the IO path, drbdsetup context */
1506         nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1507         if (!nbc) {
1508                 retcode = ERR_NOMEM;
1509                 goto fail;
1510         }
1511         spin_lock_init(&nbc->md.uuid_lock);
1512
1513         new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1514         if (!new_disk_conf) {
1515                 retcode = ERR_NOMEM;
1516                 goto fail;
1517         }
1518         nbc->disk_conf = new_disk_conf;
1519
1520         set_disk_conf_defaults(new_disk_conf);
1521         err = disk_conf_from_attrs(new_disk_conf, info);
1522         if (err) {
1523                 retcode = ERR_MANDATORY_TAG;
1524                 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
1525                 goto fail;
1526         }
1527
1528         if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1529                 new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1530
1531         new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1532         if (!new_plan) {
1533                 retcode = ERR_NOMEM;
1534                 goto fail;
1535         }
1536
1537         if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1538                 retcode = ERR_MD_IDX_INVALID;
1539                 goto fail;
1540         }
1541
1542         write_lock_irq(&global_state_lock);
1543         retcode = drbd_resync_after_valid(device, new_disk_conf->resync_after);
1544         if (retcode != NO_ERROR)
1545                 goto fail_unlock;
1546
1547         rcu_read_lock();
1548         nc = rcu_dereference(connection->net_conf);
1549         if (nc) {
1550                 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1551                         rcu_read_unlock();
1552                         retcode = ERR_STONITH_AND_PROT_A;
1553                         goto fail_unlock;
1554                 }
1555         }
1556         rcu_read_unlock();
1557
1558         bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
1559                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL, device);
1560         if (IS_ERR(bdev)) {
1561                 drbd_err(device, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
1562                         PTR_ERR(bdev));
1563                 retcode = ERR_OPEN_DISK;
1564                 goto fail_unlock;
1565         }
1566         nbc->backing_bdev = bdev;
1567
1568         /*
1569          * meta_dev_idx >= 0: external fixed size, possibly multiple
1570          * drbd sharing one meta device.  TODO in that case, paranoia
1571          * check that [md_bdev, meta_dev_idx] is not yet used by some
1572          * other drbd minor!  (if you use drbd.conf + drbdadm, that
1573          * should check it for you already; but if you don't, or
1574          * someone fooled it, we need to double check here)
1575          */
1576         bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
1577                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1578                                   (new_disk_conf->meta_dev_idx < 0) ?
1579                                   (void *)device : (void *)drbd_m_holder);
1580         if (IS_ERR(bdev)) {
1581                 drbd_err(device, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
1582                         PTR_ERR(bdev));
1583                 retcode = ERR_OPEN_MD_DISK;
1584                 goto fail_unlock;
1585         }
1586         nbc->md_bdev = bdev;
1587
1588         if ((nbc->backing_bdev == nbc->md_bdev) !=
1589             (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1590              new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1591                 retcode = ERR_MD_IDX_INVALID;
1592                 goto fail_unlock;
1593         }
1594
1595         resync_lru = lc_create("resync", drbd_bm_ext_cache,
1596                         1, 61, sizeof(struct bm_extent),
1597                         offsetof(struct bm_extent, lce));
1598         if (!resync_lru) {
1599                 retcode = ERR_NOMEM;
1600                 goto fail_unlock;
1601         }
1602
1603         /* Read our meta data super block early.
1604          * This also sets other on-disk offsets. */
1605         retcode = drbd_md_read(device, nbc);
1606         if (retcode != NO_ERROR)
1607                 goto fail_unlock;
1608
1609         if (new_disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
1610                 new_disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
1611         if (new_disk_conf->al_extents > drbd_al_extents_max(nbc))
1612                 new_disk_conf->al_extents = drbd_al_extents_max(nbc);
1613
1614         if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
1615                 drbd_err(device, "max capacity %llu smaller than disk size %llu\n",
1616                         (unsigned long long) drbd_get_max_capacity(nbc),
1617                         (unsigned long long) new_disk_conf->disk_size);
1618                 retcode = ERR_DISK_TOO_SMALL;
1619                 goto fail_unlock;
1620         }
1621
1622         if (new_disk_conf->meta_dev_idx < 0) {
1623                 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1624                 /* at least one MB, otherwise it does not make sense */
1625                 min_md_device_sectors = (2<<10);
1626         } else {
1627                 max_possible_sectors = DRBD_MAX_SECTORS;
1628                 min_md_device_sectors = MD_128MB_SECT * (new_disk_conf->meta_dev_idx + 1);
1629         }
1630
1631         if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1632                 retcode = ERR_MD_DISK_TOO_SMALL;
1633                 drbd_warn(device, "refusing attach: md-device too small, "
1634                      "at least %llu sectors needed for this meta-disk type\n",
1635                      (unsigned long long) min_md_device_sectors);
1636                 goto fail_unlock;
1637         }
1638
1639         /* Make sure the new disk is big enough
1640          * (we may currently be R_PRIMARY with no local disk...) */
1641         if (drbd_get_max_capacity(nbc) <
1642             drbd_get_capacity(device->this_bdev)) {
1643                 retcode = ERR_DISK_TOO_SMALL;
1644                 goto fail_unlock;
1645         }
1646
1647         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1648
1649         if (nbc->known_size > max_possible_sectors) {
1650                 drbd_warn(device, "==> truncating very big lower level device "
1651                         "to currently maximum possible %llu sectors <==\n",
1652                         (unsigned long long) max_possible_sectors);
1653                 if (new_disk_conf->meta_dev_idx >= 0)
1654                         drbd_warn(device, "==>> using internal or flexible "
1655                                       "meta data may help <<==\n");
1656         }
1657
1658         drbd_suspend_io(device);
1659         /* also wait for the last barrier ack. */
1660         /* FIXME see also https://daiquiri.linbit/cgi-bin/bugzilla/show_bug.cgi?id=171
1661          * We need a way to either ignore barrier acks for barriers sent before a device
1662          * was attached, or a way to wait for all pending barrier acks to come in.
1663          * As barriers are counted per resource,
1664          * we'd need to suspend io on all devices of a resource.
1665          */
1666         wait_event(device->misc_wait, !atomic_read(&device->ap_pending_cnt) || drbd_suspended(device));
1667         /* and for any other previously queued work */
1668         drbd_flush_workqueue(&connection->sender_work);
1669
1670         rv = _drbd_request_state(device, NS(disk, D_ATTACHING), CS_VERBOSE);
1671         retcode = rv;  /* FIXME: Type mismatch. */
1672         drbd_resume_io(device);
1673         if (rv < SS_SUCCESS)
1674                 goto fail_unlock;
1675
1676         if (!get_ldev_if_state(device, D_ATTACHING))
1677                 goto force_diskless;
1678
1679         if (!device->bitmap) {
1680                 if (drbd_bm_init(device)) {
1681                         retcode = ERR_NOMEM;
1682                         goto force_diskless_dec;
1683                 }
1684         }
1685
1686         if (device->state.conn < C_CONNECTED &&
1687             device->state.role == R_PRIMARY && device->ed_uuid &&
1688             (device->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1689                 drbd_err(device, "Can only attach to data with current UUID=%016llX\n",
1690                     (unsigned long long)device->ed_uuid);
1691                 retcode = ERR_DATA_NOT_CURRENT;
1692                 goto force_diskless_dec;
1693         }
1694
1695         /* Since we are diskless, fix the activity log first... */
1696         if (drbd_check_al_size(device, new_disk_conf)) {
1697                 retcode = ERR_NOMEM;
1698                 goto force_diskless_dec;
1699         }
1700
1701         /* Prevent shrinking of consistent devices ! */
1702         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1703             drbd_new_dev_size(device, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
1704                 drbd_warn(device, "refusing to truncate a consistent device\n");
1705                 retcode = ERR_DISK_TOO_SMALL;
1706                 goto force_diskless_dec;
1707         }
1708
1709         /* Reset the "barriers don't work" bits here, then force meta data to
1710          * be written, to ensure we determine if barriers are supported. */
1711         if (new_disk_conf->md_flushes)
1712                 clear_bit(MD_NO_FUA, &device->flags);
1713         else
1714                 set_bit(MD_NO_FUA, &device->flags);
1715
1716         /* Point of no return reached.
1717          * Devices and memory are no longer released by error cleanup below.
1718          * now device takes over responsibility, and the state engine should
1719          * clean it up somewhere.  */
1720         D_ASSERT(device, device->ldev == NULL);
1721         device->ldev = nbc;
1722         device->resync = resync_lru;
1723         device->rs_plan_s = new_plan;
1724         nbc = NULL;
1725         resync_lru = NULL;
1726         new_disk_conf = NULL;
1727         new_plan = NULL;
1728
1729         drbd_resync_after_changed(device);
1730         drbd_bump_write_ordering(device->resource, device->ldev, WO_BDEV_FLUSH);
1731
1732         if (drbd_md_test_flag(device->ldev, MDF_CRASHED_PRIMARY))
1733                 set_bit(CRASHED_PRIMARY, &device->flags);
1734         else
1735                 clear_bit(CRASHED_PRIMARY, &device->flags);
1736
1737         if (drbd_md_test_flag(device->ldev, MDF_PRIMARY_IND) &&
1738             !(device->state.role == R_PRIMARY && device->resource->susp_nod))
1739                 set_bit(CRASHED_PRIMARY, &device->flags);
1740
1741         device->send_cnt = 0;
1742         device->recv_cnt = 0;
1743         device->read_cnt = 0;
1744         device->writ_cnt = 0;
1745
1746         drbd_reconsider_max_bio_size(device, device->ldev);
1747
1748         /* If I am currently not R_PRIMARY,
1749          * but meta data primary indicator is set,
1750          * I just now recover from a hard crash,
1751          * and have been R_PRIMARY before that crash.
1752          *
1753          * Now, if I had no connection before that crash
1754          * (have been degraded R_PRIMARY), chances are that
1755          * I won't find my peer now either.
1756          *
1757          * In that case, and _only_ in that case,
1758          * we use the degr-wfc-timeout instead of the default,
1759          * so we can automatically recover from a crash of a
1760          * degraded but active "cluster" after a certain timeout.
1761          */
1762         clear_bit(USE_DEGR_WFC_T, &device->flags);
1763         if (device->state.role != R_PRIMARY &&
1764              drbd_md_test_flag(device->ldev, MDF_PRIMARY_IND) &&
1765             !drbd_md_test_flag(device->ldev, MDF_CONNECTED_IND))
1766                 set_bit(USE_DEGR_WFC_T, &device->flags);
1767
1768         dd = drbd_determine_dev_size(device, 0, NULL);
1769         if (dd <= DS_ERROR) {
1770                 retcode = ERR_NOMEM_BITMAP;
1771                 goto force_diskless_dec;
1772         } else if (dd == DS_GREW)
1773                 set_bit(RESYNC_AFTER_NEG, &device->flags);
1774
1775         if (drbd_md_test_flag(device->ldev, MDF_FULL_SYNC) ||
1776             (test_bit(CRASHED_PRIMARY, &device->flags) &&
1777              drbd_md_test_flag(device->ldev, MDF_AL_DISABLED))) {
1778                 drbd_info(device, "Assuming that all blocks are out of sync "
1779                      "(aka FullSync)\n");
1780                 if (drbd_bitmap_io(device, &drbd_bmio_set_n_write,
1781                         "set_n_write from attaching", BM_LOCKED_MASK)) {
1782                         retcode = ERR_IO_MD_DISK;
1783                         goto force_diskless_dec;
1784                 }
1785         } else {
1786                 if (drbd_bitmap_io(device, &drbd_bm_read,
1787                         "read from attaching", BM_LOCKED_MASK)) {
1788                         retcode = ERR_IO_MD_DISK;
1789                         goto force_diskless_dec;
1790                 }
1791         }
1792
1793         if (_drbd_bm_total_weight(device) == drbd_bm_bits(device))
1794                 drbd_suspend_al(device); /* IO is still suspended here... */
1795
1796         spin_lock_irq(&device->resource->req_lock);
1797         os = drbd_read_state(device);
1798         ns = os;
1799         /* If MDF_CONSISTENT is not set go into inconsistent state,
1800            otherwise investigate MDF_WasUpToDate...
1801            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1802            otherwise into D_CONSISTENT state.
1803         */
1804         if (drbd_md_test_flag(device->ldev, MDF_CONSISTENT)) {
1805                 if (drbd_md_test_flag(device->ldev, MDF_WAS_UP_TO_DATE))
1806                         ns.disk = D_CONSISTENT;
1807                 else
1808                         ns.disk = D_OUTDATED;
1809         } else {
1810                 ns.disk = D_INCONSISTENT;
1811         }
1812
1813         if (drbd_md_test_flag(device->ldev, MDF_PEER_OUT_DATED))
1814                 ns.pdsk = D_OUTDATED;
1815
1816         rcu_read_lock();
1817         if (ns.disk == D_CONSISTENT &&
1818             (ns.pdsk == D_OUTDATED || rcu_dereference(device->ldev->disk_conf)->fencing == FP_DONT_CARE))
1819                 ns.disk = D_UP_TO_DATE;
1820
1821         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1822            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1823            this point, because drbd_request_state() modifies these
1824            flags. */
1825
1826         if (rcu_dereference(device->ldev->disk_conf)->al_updates)
1827                 device->ldev->md.flags &= ~MDF_AL_DISABLED;
1828         else
1829                 device->ldev->md.flags |= MDF_AL_DISABLED;
1830
1831         rcu_read_unlock();
1832
1833         /* In case we are C_CONNECTED postpone any decision on the new disk
1834            state after the negotiation phase. */
1835         if (device->state.conn == C_CONNECTED) {
1836                 device->new_state_tmp.i = ns.i;
1837                 ns.i = os.i;
1838                 ns.disk = D_NEGOTIATING;
1839
1840                 /* We expect to receive up-to-date UUIDs soon.
1841                    To avoid a race in receive_state, free p_uuid while
1842                    holding req_lock. I.e. atomic with the state change */
1843                 kfree(device->p_uuid);
1844                 device->p_uuid = NULL;
1845         }
1846
1847         rv = _drbd_set_state(device, ns, CS_VERBOSE, NULL);
1848         spin_unlock_irq(&device->resource->req_lock);
1849
1850         if (rv < SS_SUCCESS)
1851                 goto force_diskless_dec;
1852
1853         write_unlock(&global_state_lock);
1854
1855         mod_timer(&device->request_timer, jiffies + HZ);
1856
1857         if (device->state.role == R_PRIMARY)
1858                 device->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1859         else
1860                 device->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1861
1862         drbd_md_mark_dirty(device);
1863         drbd_md_sync(device);
1864
1865         kobject_uevent(&disk_to_dev(device->vdisk)->kobj, KOBJ_CHANGE);
1866         put_ldev(device);
1867         conn_reconfig_done(connection);
1868         mutex_unlock(&adm_ctx.resource->adm_mutex);
1869         drbd_adm_finish(&adm_ctx, info, retcode);
1870         return 0;
1871
1872  force_diskless_dec:
1873         put_ldev(device);
1874  force_diskless:
1875         drbd_force_state(device, NS(disk, D_DISKLESS));
1876         drbd_md_sync(device);
1877  fail_unlock:
1878         write_unlock_irq(&global_state_lock);
1879  fail:
1880         conn_reconfig_done(connection);
1881         if (nbc) {
1882                 if (nbc->backing_bdev)
1883                         blkdev_put(nbc->backing_bdev,
1884                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1885                 if (nbc->md_bdev)
1886                         blkdev_put(nbc->md_bdev,
1887                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1888                 kfree(nbc);
1889         }
1890         kfree(new_disk_conf);
1891         lc_destroy(resync_lru);
1892         kfree(new_plan);
1893         mutex_unlock(&adm_ctx.resource->adm_mutex);
1894  finish:
1895         drbd_adm_finish(&adm_ctx, info, retcode);
1896         return 0;
1897 }
1898
1899 static int adm_detach(struct drbd_device *device, int force)
1900 {
1901         enum drbd_state_rv retcode;
1902         int ret;
1903
1904         if (force) {
1905                 set_bit(FORCE_DETACH, &device->flags);
1906                 drbd_force_state(device, NS(disk, D_FAILED));
1907                 retcode = SS_SUCCESS;
1908                 goto out;
1909         }
1910
1911         drbd_suspend_io(device); /* so no-one is stuck in drbd_al_begin_io */
1912         drbd_md_get_buffer(device, __func__); /* make sure there is no in-flight meta-data IO */
1913         retcode = drbd_request_state(device, NS(disk, D_FAILED));
1914         drbd_md_put_buffer(device);
1915         /* D_FAILED will transition to DISKLESS. */
1916         ret = wait_event_interruptible(device->misc_wait,
1917                         device->state.disk != D_FAILED);
1918         drbd_resume_io(device);
1919         if ((int)retcode == (int)SS_IS_DISKLESS)
1920                 retcode = SS_NOTHING_TO_DO;
1921         if (ret)
1922                 retcode = ERR_INTR;
1923 out:
1924         return retcode;
1925 }
1926
1927 /* Detaching the disk is a process in multiple stages.  First we need to lock
1928  * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1929  * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1930  * internal references as well.
1931  * Only then we have finally detached. */
1932 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
1933 {
1934         struct drbd_config_context adm_ctx;
1935         enum drbd_ret_code retcode;
1936         struct detach_parms parms = { };
1937         int err;
1938
1939         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
1940         if (!adm_ctx.reply_skb)
1941                 return retcode;
1942         if (retcode != NO_ERROR)
1943                 goto out;
1944
1945         if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
1946                 err = detach_parms_from_attrs(&parms, info);
1947                 if (err) {
1948                         retcode = ERR_MANDATORY_TAG;
1949                         drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
1950                         goto out;
1951                 }
1952         }
1953
1954         mutex_lock(&adm_ctx.resource->adm_mutex);
1955         retcode = adm_detach(adm_ctx.device, parms.force_detach);
1956         mutex_unlock(&adm_ctx.resource->adm_mutex);
1957 out:
1958         drbd_adm_finish(&adm_ctx, info, retcode);
1959         return 0;
1960 }
1961
1962 static bool conn_resync_running(struct drbd_connection *connection)
1963 {
1964         struct drbd_peer_device *peer_device;
1965         bool rv = false;
1966         int vnr;
1967
1968         rcu_read_lock();
1969         idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
1970                 struct drbd_device *device = peer_device->device;
1971                 if (device->state.conn == C_SYNC_SOURCE ||
1972                     device->state.conn == C_SYNC_TARGET ||
1973                     device->state.conn == C_PAUSED_SYNC_S ||
1974                     device->state.conn == C_PAUSED_SYNC_T) {
1975                         rv = true;
1976                         break;
1977                 }
1978         }
1979         rcu_read_unlock();
1980
1981         return rv;
1982 }
1983
1984 static bool conn_ov_running(struct drbd_connection *connection)
1985 {
1986         struct drbd_peer_device *peer_device;
1987         bool rv = false;
1988         int vnr;
1989
1990         rcu_read_lock();
1991         idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
1992                 struct drbd_device *device = peer_device->device;
1993                 if (device->state.conn == C_VERIFY_S ||
1994                     device->state.conn == C_VERIFY_T) {
1995                         rv = true;
1996                         break;
1997                 }
1998         }
1999         rcu_read_unlock();
2000
2001         return rv;
2002 }
2003
2004 static enum drbd_ret_code
2005 _check_net_options(struct drbd_connection *connection, struct net_conf *old_net_conf, struct net_conf *new_net_conf)
2006 {
2007         struct drbd_peer_device *peer_device;
2008         int i;
2009
2010         if (old_net_conf && connection->cstate == C_WF_REPORT_PARAMS && connection->agreed_pro_version < 100) {
2011                 if (new_net_conf->wire_protocol != old_net_conf->wire_protocol)
2012                         return ERR_NEED_APV_100;
2013
2014                 if (new_net_conf->two_primaries != old_net_conf->two_primaries)
2015                         return ERR_NEED_APV_100;
2016
2017                 if (strcmp(new_net_conf->integrity_alg, old_net_conf->integrity_alg))
2018                         return ERR_NEED_APV_100;
2019         }
2020
2021         if (!new_net_conf->two_primaries &&
2022             conn_highest_role(connection) == R_PRIMARY &&
2023             conn_highest_peer(connection) == R_PRIMARY)
2024                 return ERR_NEED_ALLOW_TWO_PRI;
2025
2026         if (new_net_conf->two_primaries &&
2027             (new_net_conf->wire_protocol != DRBD_PROT_C))
2028                 return ERR_NOT_PROTO_C;
2029
2030         idr_for_each_entry(&connection->peer_devices, peer_device, i) {
2031                 struct drbd_device *device = peer_device->device;
2032                 if (get_ldev(device)) {
2033                         enum drbd_fencing_p fp = rcu_dereference(device->ldev->disk_conf)->fencing;
2034                         put_ldev(device);
2035                         if (new_net_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
2036                                 return ERR_STONITH_AND_PROT_A;
2037                 }
2038                 if (device->state.role == R_PRIMARY && new_net_conf->discard_my_data)
2039                         return ERR_DISCARD_IMPOSSIBLE;
2040         }
2041
2042         if (new_net_conf->on_congestion != OC_BLOCK && new_net_conf->wire_protocol != DRBD_PROT_A)
2043                 return ERR_CONG_NOT_PROTO_A;
2044
2045         return NO_ERROR;
2046 }
2047
2048 static enum drbd_ret_code
2049 check_net_options(struct drbd_connection *connection, struct net_conf *new_net_conf)
2050 {
2051         static enum drbd_ret_code rv;
2052         struct drbd_peer_device *peer_device;
2053         int i;
2054
2055         rcu_read_lock();
2056         rv = _check_net_options(connection, rcu_dereference(connection->net_conf), new_net_conf);
2057         rcu_read_unlock();
2058
2059         /* connection->peer_devices protected by genl_lock() here */
2060         idr_for_each_entry(&connection->peer_devices, peer_device, i) {
2061                 struct drbd_device *device = peer_device->device;
2062                 if (!device->bitmap) {
2063                         if (drbd_bm_init(device))
2064                                 return ERR_NOMEM;
2065                 }
2066         }
2067
2068         return rv;
2069 }
2070
2071 struct crypto {
2072         struct crypto_hash *verify_tfm;
2073         struct crypto_hash *csums_tfm;
2074         struct crypto_hash *cram_hmac_tfm;
2075         struct crypto_hash *integrity_tfm;
2076 };
2077
2078 static int
2079 alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
2080 {
2081         if (!tfm_name[0])
2082                 return NO_ERROR;
2083
2084         *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
2085         if (IS_ERR(*tfm)) {
2086                 *tfm = NULL;
2087                 return err_alg;
2088         }
2089
2090         return NO_ERROR;
2091 }
2092
2093 static enum drbd_ret_code
2094 alloc_crypto(struct crypto *crypto, struct net_conf *new_net_conf)
2095 {
2096         char hmac_name[CRYPTO_MAX_ALG_NAME];
2097         enum drbd_ret_code rv;
2098
2099         rv = alloc_hash(&crypto->csums_tfm, new_net_conf->csums_alg,
2100                        ERR_CSUMS_ALG);
2101         if (rv != NO_ERROR)
2102                 return rv;
2103         rv = alloc_hash(&crypto->verify_tfm, new_net_conf->verify_alg,
2104                        ERR_VERIFY_ALG);
2105         if (rv != NO_ERROR)
2106                 return rv;
2107         rv = alloc_hash(&crypto->integrity_tfm, new_net_conf->integrity_alg,
2108                        ERR_INTEGRITY_ALG);
2109         if (rv != NO_ERROR)
2110                 return rv;
2111         if (new_net_conf->cram_hmac_alg[0] != 0) {
2112                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
2113                          new_net_conf->cram_hmac_alg);
2114
2115                 rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
2116                                ERR_AUTH_ALG);
2117         }
2118
2119         return rv;
2120 }
2121
2122 static void free_crypto(struct crypto *crypto)
2123 {
2124         crypto_free_hash(crypto->cram_hmac_tfm);
2125         crypto_free_hash(crypto->integrity_tfm);
2126         crypto_free_hash(crypto->csums_tfm);
2127         crypto_free_hash(crypto->verify_tfm);
2128 }
2129
2130 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
2131 {
2132         struct drbd_config_context adm_ctx;
2133         enum drbd_ret_code retcode;
2134         struct drbd_connection *connection;
2135         struct net_conf *old_net_conf, *new_net_conf = NULL;
2136         int err;
2137         int ovr; /* online verify running */
2138         int rsr; /* re-sync running */
2139         struct crypto crypto = { };
2140
2141         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_CONNECTION);
2142         if (!adm_ctx.reply_skb)
2143                 return retcode;
2144         if (retcode != NO_ERROR)
2145                 goto finish;
2146
2147         connection = adm_ctx.connection;
2148         mutex_lock(&adm_ctx.resource->adm_mutex);
2149
2150         new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
2151         if (!new_net_conf) {
2152                 retcode = ERR_NOMEM;
2153                 goto out;
2154         }
2155
2156         conn_reconfig_start(connection);
2157
2158         mutex_lock(&connection->data.mutex);
2159         mutex_lock(&connection->resource->conf_update);
2160         old_net_conf = connection->net_conf;
2161
2162         if (!old_net_conf) {
2163                 drbd_msg_put_info(adm_ctx.reply_skb, "net conf missing, try connect");
2164                 retcode = ERR_INVALID_REQUEST;
2165                 goto fail;
2166         }
2167
2168         *new_net_conf = *old_net_conf;
2169         if (should_set_defaults(info))
2170                 set_net_conf_defaults(new_net_conf);
2171
2172         err = net_conf_from_attrs_for_change(new_net_conf, info);
2173         if (err && err != -ENOMSG) {
2174                 retcode = ERR_MANDATORY_TAG;
2175                 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2176                 goto fail;
2177         }
2178
2179         retcode = check_net_options(connection, new_net_conf);
2180         if (retcode != NO_ERROR)
2181                 goto fail;
2182
2183         /* re-sync running */
2184         rsr = conn_resync_running(connection);
2185         if (rsr && strcmp(new_net_conf->csums_alg, old_net_conf->csums_alg)) {
2186                 retcode = ERR_CSUMS_RESYNC_RUNNING;
2187                 goto fail;
2188         }
2189
2190         /* online verify running */
2191         ovr = conn_ov_running(connection);
2192         if (ovr && strcmp(new_net_conf->verify_alg, old_net_conf->verify_alg)) {
2193                 retcode = ERR_VERIFY_RUNNING;
2194                 goto fail;
2195         }
2196
2197         retcode = alloc_crypto(&crypto, new_net_conf);
2198         if (retcode != NO_ERROR)
2199                 goto fail;
2200
2201         rcu_assign_pointer(connection->net_conf, new_net_conf);
2202
2203         if (!rsr) {
2204                 crypto_free_hash(connection->csums_tfm);
2205                 connection->csums_tfm = crypto.csums_tfm;
2206                 crypto.csums_tfm = NULL;
2207         }
2208         if (!ovr) {
2209                 crypto_free_hash(connection->verify_tfm);
2210                 connection->verify_tfm = crypto.verify_tfm;
2211                 crypto.verify_tfm = NULL;
2212         }
2213
2214         crypto_free_hash(connection->integrity_tfm);
2215         connection->integrity_tfm = crypto.integrity_tfm;
2216         if (connection->cstate >= C_WF_REPORT_PARAMS && connection->agreed_pro_version >= 100)
2217                 /* Do this without trying to take connection->data.mutex again.  */
2218                 __drbd_send_protocol(connection, P_PROTOCOL_UPDATE);
2219
2220         crypto_free_hash(connection->cram_hmac_tfm);
2221         connection->cram_hmac_tfm = crypto.cram_hmac_tfm;
2222
2223         mutex_unlock(&connection->resource->conf_update);
2224         mutex_unlock(&connection->data.mutex);
2225         synchronize_rcu();
2226         kfree(old_net_conf);
2227
2228         if (connection->cstate >= C_WF_REPORT_PARAMS) {
2229                 struct drbd_peer_device *peer_device;
2230                 int vnr;
2231
2232                 idr_for_each_entry(&connection->peer_devices, peer_device, vnr)
2233                         drbd_send_sync_param(peer_device);
2234         }
2235
2236         goto done;
2237
2238  fail:
2239         mutex_unlock(&connection->resource->conf_update);
2240         mutex_unlock(&connection->data.mutex);
2241         free_crypto(&crypto);
2242         kfree(new_net_conf);
2243  done:
2244         conn_reconfig_done(connection);
2245  out:
2246         mutex_unlock(&adm_ctx.resource->adm_mutex);
2247  finish:
2248         drbd_adm_finish(&adm_ctx, info, retcode);
2249         return 0;
2250 }
2251
2252 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
2253 {
2254         struct drbd_config_context adm_ctx;
2255         struct drbd_peer_device *peer_device;
2256         struct net_conf *old_net_conf, *new_net_conf = NULL;
2257         struct crypto crypto = { };
2258         struct drbd_resource *resource;
2259         struct drbd_connection *connection;
2260         enum drbd_ret_code retcode;
2261         int i;
2262         int err;
2263
2264         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
2265
2266         if (!adm_ctx.reply_skb)
2267                 return retcode;
2268         if (retcode != NO_ERROR)
2269                 goto out;
2270         if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
2271                 drbd_msg_put_info(adm_ctx.reply_skb, "connection endpoint(s) missing");
2272                 retcode = ERR_INVALID_REQUEST;
2273                 goto out;
2274         }
2275
2276         /* No need for _rcu here. All reconfiguration is
2277          * strictly serialized on genl_lock(). We are protected against
2278          * concurrent reconfiguration/addition/deletion */
2279         for_each_resource(resource, &drbd_resources) {
2280                 for_each_connection(connection, resource) {
2281                         if (nla_len(adm_ctx.my_addr) == connection->my_addr_len &&
2282                             !memcmp(nla_data(adm_ctx.my_addr), &connection->my_addr,
2283                                     connection->my_addr_len)) {
2284                                 retcode = ERR_LOCAL_ADDR;
2285                                 goto out;
2286                         }
2287
2288                         if (nla_len(adm_ctx.peer_addr) == connection->peer_addr_len &&
2289                             !memcmp(nla_data(adm_ctx.peer_addr), &connection->peer_addr,
2290                                     connection->peer_addr_len)) {
2291                                 retcode = ERR_PEER_ADDR;
2292                                 goto out;
2293                         }
2294                 }
2295         }
2296
2297         mutex_lock(&adm_ctx.resource->adm_mutex);
2298         connection = first_connection(adm_ctx.resource);
2299         conn_reconfig_start(connection);
2300
2301         if (connection->cstate > C_STANDALONE) {
2302                 retcode = ERR_NET_CONFIGURED;
2303                 goto fail;
2304         }
2305
2306         /* allocation not in the IO path, drbdsetup / netlink process context */
2307         new_net_conf = kzalloc(sizeof(*new_net_conf), GFP_KERNEL);
2308         if (!new_net_conf) {
2309                 retcode = ERR_NOMEM;
2310                 goto fail;
2311         }
2312
2313         set_net_conf_defaults(new_net_conf);
2314
2315         err = net_conf_from_attrs(new_net_conf, info);
2316         if (err && err != -ENOMSG) {
2317                 retcode = ERR_MANDATORY_TAG;
2318                 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2319                 goto fail;
2320         }
2321
2322         retcode = check_net_options(connection, new_net_conf);
2323         if (retcode != NO_ERROR)
2324                 goto fail;
2325
2326         retcode = alloc_crypto(&crypto, new_net_conf);
2327         if (retcode != NO_ERROR)
2328                 goto fail;
2329
2330         ((char *)new_net_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2331
2332         drbd_flush_workqueue(&connection->sender_work);
2333
2334         mutex_lock(&adm_ctx.resource->conf_update);
2335         old_net_conf = connection->net_conf;
2336         if (old_net_conf) {
2337                 retcode = ERR_NET_CONFIGURED;
2338                 mutex_unlock(&adm_ctx.resource->conf_update);
2339                 goto fail;
2340         }
2341         rcu_assign_pointer(connection->net_conf, new_net_conf);
2342
2343         conn_free_crypto(connection);
2344         connection->cram_hmac_tfm = crypto.cram_hmac_tfm;
2345         connection->integrity_tfm = crypto.integrity_tfm;
2346         connection->csums_tfm = crypto.csums_tfm;
2347         connection->verify_tfm = crypto.verify_tfm;
2348
2349         connection->my_addr_len = nla_len(adm_ctx.my_addr);
2350         memcpy(&connection->my_addr, nla_data(adm_ctx.my_addr), connection->my_addr_len);
2351         connection->peer_addr_len = nla_len(adm_ctx.peer_addr);
2352         memcpy(&connection->peer_addr, nla_data(adm_ctx.peer_addr), connection->peer_addr_len);
2353
2354         mutex_unlock(&adm_ctx.resource->conf_update);
2355
2356         rcu_read_lock();
2357         idr_for_each_entry(&connection->peer_devices, peer_device, i) {
2358                 struct drbd_device *device = peer_device->device;
2359                 device->send_cnt = 0;
2360                 device->recv_cnt = 0;
2361         }
2362         rcu_read_unlock();
2363
2364         retcode = conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2365
2366         conn_reconfig_done(connection);
2367         mutex_unlock(&adm_ctx.resource->adm_mutex);
2368         drbd_adm_finish(&adm_ctx, info, retcode);
2369         return 0;
2370
2371 fail:
2372         free_crypto(&crypto);
2373         kfree(new_net_conf);
2374
2375         conn_reconfig_done(connection);
2376         mutex_unlock(&adm_ctx.resource->adm_mutex);
2377 out:
2378         drbd_adm_finish(&adm_ctx, info, retcode);
2379         return 0;
2380 }
2381
2382 static enum drbd_state_rv conn_try_disconnect(struct drbd_connection *connection, bool force)
2383 {
2384         enum drbd_state_rv rv;
2385
2386         rv = conn_request_state(connection, NS(conn, C_DISCONNECTING),
2387                         force ? CS_HARD : 0);
2388
2389         switch (rv) {
2390         case SS_NOTHING_TO_DO:
2391                 break;
2392         case SS_ALREADY_STANDALONE:
2393                 return SS_SUCCESS;
2394         case SS_PRIMARY_NOP:
2395                 /* Our state checking code wants to see the peer outdated. */
2396                 rv = conn_request_state(connection, NS2(conn, C_DISCONNECTING, pdsk, D_OUTDATED), 0);
2397
2398                 if (rv == SS_OUTDATE_WO_CONN) /* lost connection before graceful disconnect succeeded */
2399                         rv = conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_VERBOSE);
2400
2401                 break;
2402         case SS_CW_FAILED_BY_PEER:
2403                 /* The peer probably wants to see us outdated. */
2404                 rv = conn_request_state(connection, NS2(conn, C_DISCONNECTING,
2405                                                         disk, D_OUTDATED), 0);
2406                 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2407                         rv = conn_request_state(connection, NS(conn, C_DISCONNECTING),
2408                                         CS_HARD);
2409                 }
2410                 break;
2411         default:;
2412                 /* no special handling necessary */
2413         }
2414
2415         if (rv >= SS_SUCCESS) {
2416                 enum drbd_state_rv rv2;
2417                 /* No one else can reconfigure the network while I am here.
2418                  * The state handling only uses drbd_thread_stop_nowait(),
2419                  * we want to really wait here until the receiver is no more.
2420                  */
2421                 drbd_thread_stop(&connection->receiver);
2422
2423                 /* Race breaker.  This additional state change request may be
2424                  * necessary, if this was a forced disconnect during a receiver
2425                  * restart.  We may have "killed" the receiver thread just
2426                  * after drbd_receiver() returned.  Typically, we should be
2427                  * C_STANDALONE already, now, and this becomes a no-op.
2428                  */
2429                 rv2 = conn_request_state(connection, NS(conn, C_STANDALONE),
2430                                 CS_VERBOSE | CS_HARD);
2431                 if (rv2 < SS_SUCCESS)
2432                         drbd_err(connection,
2433                                 "unexpected rv2=%d in conn_try_disconnect()\n",
2434                                 rv2);
2435         }
2436         return rv;
2437 }
2438
2439 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2440 {
2441         struct drbd_config_context adm_ctx;
2442         struct disconnect_parms parms;
2443         struct drbd_connection *connection;
2444         enum drbd_state_rv rv;
2445         enum drbd_ret_code retcode;
2446         int err;
2447
2448         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_CONNECTION);
2449         if (!adm_ctx.reply_skb)
2450                 return retcode;
2451         if (retcode != NO_ERROR)
2452                 goto fail;
2453
2454         connection = adm_ctx.connection;
2455         memset(&parms, 0, sizeof(parms));
2456         if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2457                 err = disconnect_parms_from_attrs(&parms, info);
2458                 if (err) {
2459                         retcode = ERR_MANDATORY_TAG;
2460                         drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2461                         goto fail;
2462                 }
2463         }
2464
2465         mutex_lock(&adm_ctx.resource->adm_mutex);
2466         rv = conn_try_disconnect(connection, parms.force_disconnect);
2467         if (rv < SS_SUCCESS)
2468                 retcode = rv;  /* FIXME: Type mismatch. */
2469         else
2470                 retcode = NO_ERROR;
2471         mutex_unlock(&adm_ctx.resource->adm_mutex);
2472  fail:
2473         drbd_adm_finish(&adm_ctx, info, retcode);
2474         return 0;
2475 }
2476
2477 void resync_after_online_grow(struct drbd_device *device)
2478 {
2479         int iass; /* I am sync source */
2480
2481         drbd_info(device, "Resync of new storage after online grow\n");
2482         if (device->state.role != device->state.peer)
2483                 iass = (device->state.role == R_PRIMARY);
2484         else
2485                 iass = test_bit(RESOLVE_CONFLICTS, &first_peer_device(device)->connection->flags);
2486
2487         if (iass)
2488                 drbd_start_resync(device, C_SYNC_SOURCE);
2489         else
2490                 _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2491 }
2492
2493 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2494 {
2495         struct drbd_config_context adm_ctx;
2496         struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
2497         struct resize_parms rs;
2498         struct drbd_device *device;
2499         enum drbd_ret_code retcode;
2500         enum determine_dev_size dd;
2501         bool change_al_layout = false;
2502         enum dds_flags ddsf;
2503         sector_t u_size;
2504         int err;
2505
2506         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2507         if (!adm_ctx.reply_skb)
2508                 return retcode;
2509         if (retcode != NO_ERROR)
2510                 goto finish;
2511
2512         mutex_lock(&adm_ctx.resource->adm_mutex);
2513         device = adm_ctx.device;
2514         if (!get_ldev(device)) {
2515                 retcode = ERR_NO_DISK;
2516                 goto fail;
2517         }
2518
2519         memset(&rs, 0, sizeof(struct resize_parms));
2520         rs.al_stripes = device->ldev->md.al_stripes;
2521         rs.al_stripe_size = device->ldev->md.al_stripe_size_4k * 4;
2522         if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2523                 err = resize_parms_from_attrs(&rs, info);
2524                 if (err) {
2525                         retcode = ERR_MANDATORY_TAG;
2526                         drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2527                         goto fail_ldev;
2528                 }
2529         }
2530
2531         if (device->state.conn > C_CONNECTED) {
2532                 retcode = ERR_RESIZE_RESYNC;
2533                 goto fail_ldev;
2534         }
2535
2536         if (device->state.role == R_SECONDARY &&
2537             device->state.peer == R_SECONDARY) {
2538                 retcode = ERR_NO_PRIMARY;
2539                 goto fail_ldev;
2540         }
2541
2542         if (rs.no_resync && first_peer_device(device)->connection->agreed_pro_version < 93) {
2543                 retcode = ERR_NEED_APV_93;
2544                 goto fail_ldev;
2545         }
2546
2547         rcu_read_lock();
2548         u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
2549         rcu_read_unlock();
2550         if (u_size != (sector_t)rs.resize_size) {
2551                 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2552                 if (!new_disk_conf) {
2553                         retcode = ERR_NOMEM;
2554                         goto fail_ldev;
2555                 }
2556         }
2557
2558         if (device->ldev->md.al_stripes != rs.al_stripes ||
2559             device->ldev->md.al_stripe_size_4k != rs.al_stripe_size / 4) {
2560                 u32 al_size_k = rs.al_stripes * rs.al_stripe_size;
2561
2562                 if (al_size_k > (16 * 1024 * 1024)) {
2563                         retcode = ERR_MD_LAYOUT_TOO_BIG;
2564                         goto fail_ldev;
2565                 }
2566
2567                 if (al_size_k < MD_32kB_SECT/2) {
2568                         retcode = ERR_MD_LAYOUT_TOO_SMALL;
2569                         goto fail_ldev;
2570                 }
2571
2572                 if (device->state.conn != C_CONNECTED && !rs.resize_force) {
2573                         retcode = ERR_MD_LAYOUT_CONNECTED;
2574                         goto fail_ldev;
2575                 }
2576
2577                 change_al_layout = true;
2578         }
2579
2580         if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev))
2581                 device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev);
2582
2583         if (new_disk_conf) {
2584                 mutex_lock(&device->resource->conf_update);
2585                 old_disk_conf = device->ldev->disk_conf;
2586                 *new_disk_conf = *old_disk_conf;
2587                 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2588                 rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
2589                 mutex_unlock(&device->resource->conf_update);
2590                 synchronize_rcu();
2591                 kfree(old_disk_conf);
2592         }
2593
2594         ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2595         dd = drbd_determine_dev_size(device, ddsf, change_al_layout ? &rs : NULL);
2596         drbd_md_sync(device);
2597         put_ldev(device);
2598         if (dd == DS_ERROR) {
2599                 retcode = ERR_NOMEM_BITMAP;
2600                 goto fail;
2601         } else if (dd == DS_ERROR_SPACE_MD) {
2602                 retcode = ERR_MD_LAYOUT_NO_FIT;
2603                 goto fail;
2604         } else if (dd == DS_ERROR_SHRINK) {
2605                 retcode = ERR_IMPLICIT_SHRINK;
2606                 goto fail;
2607         }
2608
2609         if (device->state.conn == C_CONNECTED) {
2610                 if (dd == DS_GREW)
2611                         set_bit(RESIZE_PENDING, &device->flags);
2612
2613                 drbd_send_uuids(first_peer_device(device));
2614                 drbd_send_sizes(first_peer_device(device), 1, ddsf);
2615         }
2616
2617  fail:
2618         mutex_unlock(&adm_ctx.resource->adm_mutex);
2619  finish:
2620         drbd_adm_finish(&adm_ctx, info, retcode);
2621         return 0;
2622
2623  fail_ldev:
2624         put_ldev(device);
2625         goto fail;
2626 }
2627
2628 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2629 {
2630         struct drbd_config_context adm_ctx;
2631         enum drbd_ret_code retcode;
2632         struct res_opts res_opts;
2633         int err;
2634
2635         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
2636         if (!adm_ctx.reply_skb)
2637                 return retcode;
2638         if (retcode != NO_ERROR)
2639                 goto fail;
2640
2641         res_opts = adm_ctx.resource->res_opts;
2642         if (should_set_defaults(info))
2643                 set_res_opts_defaults(&res_opts);
2644
2645         err = res_opts_from_attrs(&res_opts, info);
2646         if (err && err != -ENOMSG) {
2647                 retcode = ERR_MANDATORY_TAG;
2648                 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2649                 goto fail;
2650         }
2651
2652         mutex_lock(&adm_ctx.resource->adm_mutex);
2653         err = set_resource_options(adm_ctx.resource, &res_opts);
2654         if (err) {
2655                 retcode = ERR_INVALID_REQUEST;
2656                 if (err == -ENOMEM)
2657                         retcode = ERR_NOMEM;
2658         }
2659         mutex_unlock(&adm_ctx.resource->adm_mutex);
2660
2661 fail:
2662         drbd_adm_finish(&adm_ctx, info, retcode);
2663         return 0;
2664 }
2665
2666 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2667 {
2668         struct drbd_config_context adm_ctx;
2669         struct drbd_device *device;
2670         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2671
2672         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2673         if (!adm_ctx.reply_skb)
2674                 return retcode;
2675         if (retcode != NO_ERROR)
2676                 goto out;
2677
2678         device = adm_ctx.device;
2679         if (!get_ldev(device)) {
2680                 retcode = ERR_NO_DISK;
2681                 goto out;
2682         }
2683
2684         mutex_lock(&adm_ctx.resource->adm_mutex);
2685
2686         /* If there is still bitmap IO pending, probably because of a previous
2687          * resync just being finished, wait for it before requesting a new resync.
2688          * Also wait for it's after_state_ch(). */
2689         drbd_suspend_io(device);
2690         wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
2691         drbd_flush_workqueue(&first_peer_device(device)->connection->sender_work);
2692
2693         /* If we happen to be C_STANDALONE R_SECONDARY, just change to
2694          * D_INCONSISTENT, and set all bits in the bitmap.  Otherwise,
2695          * try to start a resync handshake as sync target for full sync.
2696          */
2697         if (device->state.conn == C_STANDALONE && device->state.role == R_SECONDARY) {
2698                 retcode = drbd_request_state(device, NS(disk, D_INCONSISTENT));
2699                 if (retcode >= SS_SUCCESS) {
2700                         if (drbd_bitmap_io(device, &drbd_bmio_set_n_write,
2701                                 "set_n_write from invalidate", BM_LOCKED_MASK))
2702                                 retcode = ERR_IO_MD_DISK;
2703                 }
2704         } else
2705                 retcode = drbd_request_state(device, NS(conn, C_STARTING_SYNC_T));
2706         drbd_resume_io(device);
2707         mutex_unlock(&adm_ctx.resource->adm_mutex);
2708         put_ldev(device);
2709 out:
2710         drbd_adm_finish(&adm_ctx, info, retcode);
2711         return 0;
2712 }
2713
2714 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2715                 union drbd_state mask, union drbd_state val)
2716 {
2717         struct drbd_config_context adm_ctx;
2718         enum drbd_ret_code retcode;
2719
2720         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2721         if (!adm_ctx.reply_skb)
2722                 return retcode;
2723         if (retcode != NO_ERROR)
2724                 goto out;
2725
2726         mutex_lock(&adm_ctx.resource->adm_mutex);
2727         retcode = drbd_request_state(adm_ctx.device, mask, val);
2728         mutex_unlock(&adm_ctx.resource->adm_mutex);
2729 out:
2730         drbd_adm_finish(&adm_ctx, info, retcode);
2731         return 0;
2732 }
2733
2734 static int drbd_bmio_set_susp_al(struct drbd_device *device) __must_hold(local)
2735 {
2736         int rv;
2737
2738         rv = drbd_bmio_set_n_write(device);
2739         drbd_suspend_al(device);
2740         return rv;
2741 }
2742
2743 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
2744 {
2745         struct drbd_config_context adm_ctx;
2746         int retcode; /* drbd_ret_code, drbd_state_rv */
2747         struct drbd_device *device;
2748
2749         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2750         if (!adm_ctx.reply_skb)
2751                 return retcode;
2752         if (retcode != NO_ERROR)
2753                 goto out;
2754
2755         device = adm_ctx.device;
2756         if (!get_ldev(device)) {
2757                 retcode = ERR_NO_DISK;
2758                 goto out;
2759         }
2760
2761         mutex_lock(&adm_ctx.resource->adm_mutex);
2762
2763         /* If there is still bitmap IO pending, probably because of a previous
2764          * resync just being finished, wait for it before requesting a new resync.
2765          * Also wait for it's after_state_ch(). */
2766         drbd_suspend_io(device);
2767         wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
2768         drbd_flush_workqueue(&first_peer_device(device)->connection->sender_work);
2769
2770         /* If we happen to be C_STANDALONE R_PRIMARY, just set all bits
2771          * in the bitmap.  Otherwise, try to start a resync handshake
2772          * as sync source for full sync.
2773          */
2774         if (device->state.conn == C_STANDALONE && device->state.role == R_PRIMARY) {
2775                 /* The peer will get a resync upon connect anyways. Just make that
2776                    into a full resync. */
2777                 retcode = drbd_request_state(device, NS(pdsk, D_INCONSISTENT));
2778                 if (retcode >= SS_SUCCESS) {
2779                         if (drbd_bitmap_io(device, &drbd_bmio_set_susp_al,
2780                                 "set_n_write from invalidate_peer",
2781                                 BM_LOCKED_SET_ALLOWED))
2782                                 retcode = ERR_IO_MD_DISK;
2783                 }
2784         } else
2785                 retcode = drbd_request_state(device, NS(conn, C_STARTING_SYNC_S));
2786         drbd_resume_io(device);
2787         mutex_unlock(&adm_ctx.resource->adm_mutex);
2788         put_ldev(device);
2789 out:
2790         drbd_adm_finish(&adm_ctx, info, retcode);
2791         return 0;
2792 }
2793
2794 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2795 {
2796         struct drbd_config_context adm_ctx;
2797         enum drbd_ret_code retcode;
2798
2799         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2800         if (!adm_ctx.reply_skb)
2801                 return retcode;
2802         if (retcode != NO_ERROR)
2803                 goto out;
2804
2805         mutex_lock(&adm_ctx.resource->adm_mutex);
2806         if (drbd_request_state(adm_ctx.device, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2807                 retcode = ERR_PAUSE_IS_SET;
2808         mutex_unlock(&adm_ctx.resource->adm_mutex);
2809 out:
2810         drbd_adm_finish(&adm_ctx, info, retcode);
2811         return 0;
2812 }
2813
2814 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
2815 {
2816         struct drbd_config_context adm_ctx;
2817         union drbd_dev_state s;
2818         enum drbd_ret_code retcode;
2819
2820         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2821         if (!adm_ctx.reply_skb)
2822                 return retcode;
2823         if (retcode != NO_ERROR)
2824                 goto out;
2825
2826         mutex_lock(&adm_ctx.resource->adm_mutex);
2827         if (drbd_request_state(adm_ctx.device, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2828                 s = adm_ctx.device->state;
2829                 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2830                         retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2831                                   s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2832                 } else {
2833                         retcode = ERR_PAUSE_IS_CLEAR;
2834                 }
2835         }
2836         mutex_unlock(&adm_ctx.resource->adm_mutex);
2837 out:
2838         drbd_adm_finish(&adm_ctx, info, retcode);
2839         return 0;
2840 }
2841
2842 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
2843 {
2844         return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
2845 }
2846
2847 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
2848 {
2849         struct drbd_config_context adm_ctx;
2850         struct drbd_device *device;
2851         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2852
2853         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2854         if (!adm_ctx.reply_skb)
2855                 return retcode;
2856         if (retcode != NO_ERROR)
2857                 goto out;
2858
2859         mutex_lock(&adm_ctx.resource->adm_mutex);
2860         device = adm_ctx.device;
2861         if (test_bit(NEW_CUR_UUID, &device->flags)) {
2862                 drbd_uuid_new_current(device);
2863                 clear_bit(NEW_CUR_UUID, &device->flags);
2864         }
2865         drbd_suspend_io(device);
2866         retcode = drbd_request_state(device, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2867         if (retcode == SS_SUCCESS) {
2868                 if (device->state.conn < C_CONNECTED)
2869                         tl_clear(first_peer_device(device)->connection);
2870                 if (device->state.disk == D_DISKLESS || device->state.disk == D_FAILED)
2871                         tl_restart(first_peer_device(device)->connection, FAIL_FROZEN_DISK_IO);
2872         }
2873         drbd_resume_io(device);
2874         mutex_unlock(&adm_ctx.resource->adm_mutex);
2875 out:
2876         drbd_adm_finish(&adm_ctx, info, retcode);
2877         return 0;
2878 }
2879
2880 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
2881 {
2882         return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
2883 }
2884
2885 static int nla_put_drbd_cfg_context(struct sk_buff *skb,
2886                                     struct drbd_resource *resource,
2887                                     struct drbd_connection *connection,
2888                                     struct drbd_device *device)
2889 {
2890         struct nlattr *nla;
2891         nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2892         if (!nla)
2893                 goto nla_put_failure;
2894         if (device &&
2895             nla_put_u32(skb, T_ctx_volume, device->vnr))
2896                 goto nla_put_failure;
2897         if (nla_put_string(skb, T_ctx_resource_name, resource->name))
2898                 goto nla_put_failure;
2899         if (connection) {
2900                 if (connection->my_addr_len &&
2901                     nla_put(skb, T_ctx_my_addr, connection->my_addr_len, &connection->my_addr))
2902                         goto nla_put_failure;
2903                 if (connection->peer_addr_len &&
2904                     nla_put(skb, T_ctx_peer_addr, connection->peer_addr_len, &connection->peer_addr))
2905                         goto nla_put_failure;
2906         }
2907         nla_nest_end(skb, nla);
2908         return 0;
2909
2910 nla_put_failure:
2911         if (nla)
2912                 nla_nest_cancel(skb, nla);
2913         return -EMSGSIZE;
2914 }
2915
2916 /*
2917  * Return the connection of @resource if @resource has exactly one connection.
2918  */
2919 static struct drbd_connection *the_only_connection(struct drbd_resource *resource)
2920 {
2921         struct list_head *connections = &resource->connections;
2922
2923         if (list_empty(connections) || connections->next->next != connections)
2924                 return NULL;
2925         return list_first_entry(&resource->connections, struct drbd_connection, connections);
2926 }
2927
2928 static int nla_put_status_info(struct sk_buff *skb, struct drbd_device *device,
2929                 const struct sib_info *sib)
2930 {
2931         struct drbd_resource *resource = device->resource;
2932         struct state_info *si = NULL; /* for sizeof(si->member); */
2933         struct nlattr *nla;
2934         int got_ldev;
2935         int err = 0;
2936         int exclude_sensitive;
2937
2938         /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2939          * to.  So we better exclude_sensitive information.
2940          *
2941          * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2942          * in the context of the requesting user process. Exclude sensitive
2943          * information, unless current has superuser.
2944          *
2945          * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2946          * relies on the current implementation of netlink_dump(), which
2947          * executes the dump callback successively from netlink_recvmsg(),
2948          * always in the context of the receiving process */
2949         exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2950
2951         got_ldev = get_ldev(device);
2952
2953         /* We need to add connection name and volume number information still.
2954          * Minor number is in drbd_genlmsghdr. */
2955         if (nla_put_drbd_cfg_context(skb, resource, the_only_connection(resource), device))
2956                 goto nla_put_failure;
2957
2958         if (res_opts_to_skb(skb, &device->resource->res_opts, exclude_sensitive))
2959                 goto nla_put_failure;
2960
2961         rcu_read_lock();
2962         if (got_ldev) {
2963                 struct disk_conf *disk_conf;
2964
2965                 disk_conf = rcu_dereference(device->ldev->disk_conf);
2966                 err = disk_conf_to_skb(skb, disk_conf, exclude_sensitive);
2967         }
2968         if (!err) {
2969                 struct net_conf *nc;
2970
2971                 nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
2972                 if (nc)
2973                         err = net_conf_to_skb(skb, nc, exclude_sensitive);
2974         }
2975         rcu_read_unlock();
2976         if (err)
2977                 goto nla_put_failure;
2978
2979         nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2980         if (!nla)
2981                 goto nla_put_failure;
2982         if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
2983             nla_put_u32(skb, T_current_state, device->state.i) ||
2984             nla_put_u64(skb, T_ed_uuid, device->ed_uuid) ||
2985             nla_put_u64(skb, T_capacity, drbd_get_capacity(device->this_bdev)) ||
2986             nla_put_u64(skb, T_send_cnt, device->send_cnt) ||
2987             nla_put_u64(skb, T_recv_cnt, device->recv_cnt) ||
2988             nla_put_u64(skb, T_read_cnt, device->read_cnt) ||
2989             nla_put_u64(skb, T_writ_cnt, device->writ_cnt) ||
2990             nla_put_u64(skb, T_al_writ_cnt, device->al_writ_cnt) ||
2991             nla_put_u64(skb, T_bm_writ_cnt, device->bm_writ_cnt) ||
2992             nla_put_u32(skb, T_ap_bio_cnt, atomic_read(&device->ap_bio_cnt)) ||
2993             nla_put_u32(skb, T_ap_pending_cnt, atomic_read(&device->ap_pending_cnt)) ||
2994             nla_put_u32(skb, T_rs_pending_cnt, atomic_read(&device->rs_pending_cnt)))
2995                 goto nla_put_failure;
2996
2997         if (got_ldev) {
2998                 int err;
2999
3000                 spin_lock_irq(&device->ldev->md.uuid_lock);
3001                 err = nla_put(skb, T_uuids, sizeof(si->uuids), device->ldev->md.uuid);
3002                 spin_unlock_irq(&device->ldev->md.uuid_lock);
3003
3004                 if (err)
3005                         goto nla_put_failure;
3006
3007                 if (nla_put_u32(skb, T_disk_flags, device->ldev->md.flags) ||
3008                     nla_put_u64(skb, T_bits_total, drbd_bm_bits(device)) ||
3009                     nla_put_u64(skb, T_bits_oos, drbd_bm_total_weight(device)))
3010                         goto nla_put_failure;
3011                 if (C_SYNC_SOURCE <= device->state.conn &&
3012                     C_PAUSED_SYNC_T >= device->state.conn) {
3013                         if (nla_put_u64(skb, T_bits_rs_total, device->rs_total) ||
3014                             nla_put_u64(skb, T_bits_rs_failed, device->rs_failed))
3015                                 goto nla_put_failure;
3016                 }
3017         }
3018
3019         if (sib) {
3020                 switch(sib->sib_reason) {
3021                 case SIB_SYNC_PROGRESS:
3022                 case SIB_GET_STATUS_REPLY:
3023                         break;
3024                 case SIB_STATE_CHANGE:
3025                         if (nla_put_u32(skb, T_prev_state, sib->os.i) ||
3026                             nla_put_u32(skb, T_new_state, sib->ns.i))
3027                                 goto nla_put_failure;
3028                         break;
3029                 case SIB_HELPER_POST:
3030                         if (nla_put_u32(skb, T_helper_exit_code,
3031                                         sib->helper_exit_code))
3032                                 goto nla_put_failure;
3033                         /* fall through */
3034                 case SIB_HELPER_PRE:
3035                         if (nla_put_string(skb, T_helper, sib->helper_name))
3036                                 goto nla_put_failure;
3037                         break;
3038                 }
3039         }
3040         nla_nest_end(skb, nla);
3041
3042         if (0)
3043 nla_put_failure:
3044                 err = -EMSGSIZE;
3045         if (got_ldev)
3046                 put_ldev(device);
3047         return err;
3048 }
3049
3050 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
3051 {
3052         struct drbd_config_context adm_ctx;
3053         enum drbd_ret_code retcode;
3054         int err;
3055
3056         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3057         if (!adm_ctx.reply_skb)
3058                 return retcode;
3059         if (retcode != NO_ERROR)
3060                 goto out;
3061
3062         err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.device, NULL);
3063         if (err) {
3064                 nlmsg_free(adm_ctx.reply_skb);
3065                 return err;
3066         }
3067 out:
3068         drbd_adm_finish(&adm_ctx, info, retcode);
3069         return 0;
3070 }
3071
3072 static int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
3073 {
3074         struct drbd_device *device;
3075         struct drbd_genlmsghdr *dh;
3076         struct drbd_resource *pos = (struct drbd_resource *)cb->args[0];
3077         struct drbd_resource *resource = NULL;
3078         struct drbd_resource *tmp;
3079         unsigned volume = cb->args[1];
3080
3081         /* Open coded, deferred, iteration:
3082          * for_each_resource_safe(resource, tmp, &drbd_resources) {
3083          *      connection = "first connection of resource or undefined";
3084          *      idr_for_each_entry(&resource->devices, device, i) {
3085          *        ...
3086          *      }
3087          * }
3088          * where resource is cb->args[0];
3089          * and i is cb->args[1];
3090          *
3091          * cb->args[2] indicates if we shall loop over all resources,
3092          * or just dump all volumes of a single resource.
3093          *
3094          * This may miss entries inserted after this dump started,
3095          * or entries deleted before they are reached.
3096          *
3097          * We need to make sure the device won't disappear while
3098          * we are looking at it, and revalidate our iterators
3099          * on each iteration.
3100          */
3101
3102         /* synchronize with conn_create()/drbd_destroy_connection() */
3103         rcu_read_lock();
3104         /* revalidate iterator position */
3105         for_each_resource_rcu(tmp, &drbd_resources) {
3106                 if (pos == NULL) {
3107                         /* first iteration */
3108                         pos = tmp;
3109                         resource = pos;
3110                         break;
3111                 }
3112                 if (tmp == pos) {
3113                         resource = pos;
3114                         break;
3115                 }
3116         }
3117         if (resource) {
3118 next_resource:
3119                 device = idr_get_next(&resource->devices, &volume);
3120                 if (!device) {
3121                         /* No more volumes to dump on this resource.
3122                          * Advance resource iterator. */
3123                         pos = list_entry_rcu(resource->resources.next,
3124                                              struct drbd_resource, resources);
3125                         /* Did we dump any volume of this resource yet? */
3126                         if (volume != 0) {
3127                                 /* If we reached the end of the list,
3128                                  * or only a single resource dump was requested,
3129                                  * we are done. */
3130                                 if (&pos->resources == &drbd_resources || cb->args[2])
3131                                         goto out;
3132                                 volume = 0;
3133                                 resource = pos;
3134                                 goto next_resource;
3135                         }
3136                 }
3137
3138                 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
3139                                 cb->nlh->nlmsg_seq, &drbd_genl_family,
3140                                 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
3141                 if (!dh)
3142                         goto out;
3143
3144                 if (!device) {
3145                         /* This is a connection without a single volume.
3146                          * Suprisingly enough, it may have a network
3147                          * configuration. */
3148                         struct drbd_connection *connection;
3149
3150                         dh->minor = -1U;
3151                         dh->ret_code = NO_ERROR;
3152                         connection = the_only_connection(resource);
3153                         if (nla_put_drbd_cfg_context(skb, resource, connection, NULL))
3154                                 goto cancel;
3155                         if (connection) {
3156                                 struct net_conf *nc;
3157
3158                                 nc = rcu_dereference(connection->net_conf);
3159                                 if (nc && net_conf_to_skb(skb, nc, 1) != 0)
3160                                         goto cancel;
3161                         }
3162                         goto done;
3163                 }
3164
3165                 D_ASSERT(device, device->vnr == volume);
3166                 D_ASSERT(device, device->resource == resource);
3167
3168                 dh->minor = device_to_minor(device);
3169                 dh->ret_code = NO_ERROR;
3170
3171                 if (nla_put_status_info(skb, device, NULL)) {
3172 cancel:
3173                         genlmsg_cancel(skb, dh);
3174                         goto out;
3175                 }
3176 done:
3177                 genlmsg_end(skb, dh);
3178         }
3179
3180 out:
3181         rcu_read_unlock();
3182         /* where to start the next iteration */
3183         cb->args[0] = (long)pos;
3184         cb->args[1] = (pos == resource) ? volume + 1 : 0;
3185
3186         /* No more resources/volumes/minors found results in an empty skb.
3187          * Which will terminate the dump. */
3188         return skb->len;
3189 }
3190
3191 /*
3192  * Request status of all resources, or of all volumes within a single resource.
3193  *
3194  * This is a dump, as the answer may not fit in a single reply skb otherwise.
3195  * Which means we cannot use the family->attrbuf or other such members, because
3196  * dump is NOT protected by the genl_lock().  During dump, we only have access
3197  * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
3198  *
3199  * Once things are setup properly, we call into get_one_status().
3200  */
3201 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
3202 {
3203         const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
3204         struct nlattr *nla;
3205         const char *resource_name;
3206         struct drbd_resource *resource;
3207         int maxtype;
3208
3209         /* Is this a followup call? */
3210         if (cb->args[0]) {
3211                 /* ... of a single resource dump,
3212                  * and the resource iterator has been advanced already? */
3213                 if (cb->args[2] && cb->args[2] != cb->args[0])
3214                         return 0; /* DONE. */
3215                 goto dump;
3216         }
3217
3218         /* First call (from netlink_dump_start).  We need to figure out
3219          * which resource(s) the user wants us to dump. */
3220         nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
3221                         nlmsg_attrlen(cb->nlh, hdrlen),
3222                         DRBD_NLA_CFG_CONTEXT);
3223
3224         /* No explicit context given.  Dump all. */
3225         if (!nla)
3226                 goto dump;
3227         maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
3228         nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
3229         if (IS_ERR(nla))
3230                 return PTR_ERR(nla);
3231         /* context given, but no name present? */
3232         if (!nla)
3233                 return -EINVAL;
3234         resource_name = nla_data(nla);
3235         if (!*resource_name)
3236                 return -ENODEV;
3237         resource = drbd_find_resource(resource_name);
3238         if (!resource)
3239                 return -ENODEV;
3240
3241         kref_put(&resource->kref, drbd_destroy_resource); /* get_one_status() revalidates the resource */
3242
3243         /* prime iterators, and set "filter" mode mark:
3244          * only dump this connection. */
3245         cb->args[0] = (long)resource;
3246         /* cb->args[1] = 0; passed in this way. */
3247         cb->args[2] = (long)resource;
3248
3249 dump:
3250         return get_one_status(skb, cb);
3251 }
3252
3253 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
3254 {
3255         struct drbd_config_context adm_ctx;
3256         enum drbd_ret_code retcode;
3257         struct timeout_parms tp;
3258         int err;
3259
3260         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3261         if (!adm_ctx.reply_skb)
3262                 return retcode;
3263         if (retcode != NO_ERROR)
3264                 goto out;
3265
3266         tp.timeout_type =
3267                 adm_ctx.device->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
3268                 test_bit(USE_DEGR_WFC_T, &adm_ctx.device->flags) ? UT_DEGRADED :
3269                 UT_DEFAULT;
3270
3271         err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
3272         if (err) {
3273                 nlmsg_free(adm_ctx.reply_skb);
3274                 return err;
3275         }
3276 out:
3277         drbd_adm_finish(&adm_ctx, info, retcode);
3278         return 0;
3279 }
3280
3281 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
3282 {
3283         struct drbd_config_context adm_ctx;
3284         struct drbd_device *device;
3285         enum drbd_ret_code retcode;
3286         struct start_ov_parms parms;
3287
3288         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3289         if (!adm_ctx.reply_skb)
3290                 return retcode;
3291         if (retcode != NO_ERROR)
3292                 goto out;
3293
3294         device = adm_ctx.device;
3295
3296         /* resume from last known position, if possible */
3297         parms.ov_start_sector = device->ov_start_sector;
3298         parms.ov_stop_sector = ULLONG_MAX;
3299         if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
3300                 int err = start_ov_parms_from_attrs(&parms, info);
3301                 if (err) {
3302                         retcode = ERR_MANDATORY_TAG;
3303                         drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
3304                         goto out;
3305                 }
3306         }
3307         mutex_lock(&adm_ctx.resource->adm_mutex);
3308
3309         /* w_make_ov_request expects position to be aligned */
3310         device->ov_start_sector = parms.ov_start_sector & ~(BM_SECT_PER_BIT-1);
3311         device->ov_stop_sector = parms.ov_stop_sector;
3312
3313         /* If there is still bitmap IO pending, e.g. previous resync or verify
3314          * just being finished, wait for it before requesting a new resync. */
3315         drbd_suspend_io(device);
3316         wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
3317         retcode = drbd_request_state(device, NS(conn, C_VERIFY_S));
3318         drbd_resume_io(device);
3319
3320         mutex_unlock(&adm_ctx.resource->adm_mutex);
3321 out:
3322         drbd_adm_finish(&adm_ctx, info, retcode);
3323         return 0;
3324 }
3325
3326
3327 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
3328 {
3329         struct drbd_config_context adm_ctx;
3330         struct drbd_device *device;
3331         enum drbd_ret_code retcode;
3332         int skip_initial_sync = 0;
3333         int err;
3334         struct new_c_uuid_parms args;
3335
3336         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3337         if (!adm_ctx.reply_skb)
3338                 return retcode;
3339         if (retcode != NO_ERROR)
3340                 goto out_nolock;
3341
3342         device = adm_ctx.device;
3343         memset(&args, 0, sizeof(args));
3344         if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
3345                 err = new_c_uuid_parms_from_attrs(&args, info);
3346                 if (err) {
3347                         retcode = ERR_MANDATORY_TAG;
3348                         drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
3349                         goto out_nolock;
3350                 }
3351         }
3352
3353         mutex_lock(&adm_ctx.resource->adm_mutex);
3354         mutex_lock(device->state_mutex); /* Protects us against serialized state changes. */
3355
3356         if (!get_ldev(device)) {
3357                 retcode = ERR_NO_DISK;
3358                 goto out;
3359         }
3360
3361         /* this is "skip initial sync", assume to be clean */
3362         if (device->state.conn == C_CONNECTED &&
3363             first_peer_device(device)->connection->agreed_pro_version >= 90 &&
3364             device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
3365                 drbd_info(device, "Preparing to skip initial sync\n");
3366                 skip_initial_sync = 1;
3367         } else if (device->state.conn != C_STANDALONE) {
3368                 retcode = ERR_CONNECTED;
3369                 goto out_dec;
3370         }
3371
3372         drbd_uuid_set(device, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
3373         drbd_uuid_new_current(device); /* New current, previous to UI_BITMAP */
3374
3375         if (args.clear_bm) {
3376                 err = drbd_bitmap_io(device, &drbd_bmio_clear_n_write,
3377                         "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
3378                 if (err) {
3379                         drbd_err(device, "Writing bitmap failed with %d\n", err);
3380                         retcode = ERR_IO_MD_DISK;
3381                 }
3382                 if (skip_initial_sync) {
3383                         drbd_send_uuids_skip_initial_sync(first_peer_device(device));
3384                         _drbd_uuid_set(device, UI_BITMAP, 0);
3385                         drbd_print_uuids(device, "cleared bitmap UUID");
3386                         spin_lock_irq(&device->resource->req_lock);
3387                         _drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3388                                         CS_VERBOSE, NULL);
3389                         spin_unlock_irq(&device->resource->req_lock);
3390                 }
3391         }
3392
3393         drbd_md_sync(device);
3394 out_dec:
3395         put_ldev(device);
3396 out:
3397         mutex_unlock(device->state_mutex);
3398         mutex_unlock(&adm_ctx.resource->adm_mutex);
3399 out_nolock:
3400         drbd_adm_finish(&adm_ctx, info, retcode);
3401         return 0;
3402 }
3403
3404 static enum drbd_ret_code
3405 drbd_check_resource_name(struct drbd_config_context *adm_ctx)
3406 {
3407         const char *name = adm_ctx->resource_name;
3408         if (!name || !name[0]) {
3409                 drbd_msg_put_info(adm_ctx->reply_skb, "resource name missing");
3410                 return ERR_MANDATORY_TAG;
3411         }
3412         /* if we want to use these in sysfs/configfs/debugfs some day,
3413          * we must not allow slashes */
3414         if (strchr(name, '/')) {
3415                 drbd_msg_put_info(adm_ctx->reply_skb, "invalid resource name");
3416                 return ERR_INVALID_REQUEST;
3417         }
3418         return NO_ERROR;
3419 }
3420
3421 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
3422 {
3423         struct drbd_config_context adm_ctx;
3424         enum drbd_ret_code retcode;
3425         struct res_opts res_opts;
3426         int err;
3427
3428         retcode = drbd_adm_prepare(&adm_ctx, skb, info, 0);
3429         if (!adm_ctx.reply_skb)
3430                 return retcode;
3431         if (retcode != NO_ERROR)
3432                 goto out;
3433
3434         set_res_opts_defaults(&res_opts);
3435         err = res_opts_from_attrs(&res_opts, info);
3436         if (err && err != -ENOMSG) {
3437                 retcode = ERR_MANDATORY_TAG;
3438                 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
3439                 goto out;
3440         }
3441
3442         retcode = drbd_check_resource_name(&adm_ctx);
3443         if (retcode != NO_ERROR)
3444                 goto out;
3445
3446         if (adm_ctx.resource) {
3447                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
3448                         retcode = ERR_INVALID_REQUEST;
3449                         drbd_msg_put_info(adm_ctx.reply_skb, "resource exists");
3450                 }
3451                 /* else: still NO_ERROR */
3452                 goto out;
3453         }
3454
3455         /* not yet safe for genl_family.parallel_ops */
3456         if (!conn_create(adm_ctx.resource_name, &res_opts))
3457                 retcode = ERR_NOMEM;
3458 out:
3459         drbd_adm_finish(&adm_ctx, info, retcode);
3460         return 0;
3461 }
3462
3463 int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info)
3464 {
3465         struct drbd_config_context adm_ctx;
3466         struct drbd_genlmsghdr *dh = info->userhdr;
3467         enum drbd_ret_code retcode;
3468
3469         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
3470         if (!adm_ctx.reply_skb)
3471                 return retcode;
3472         if (retcode != NO_ERROR)
3473                 goto out;
3474
3475         if (dh->minor > MINORMASK) {
3476                 drbd_msg_put_info(adm_ctx.reply_skb, "requested minor out of range");
3477                 retcode = ERR_INVALID_REQUEST;
3478                 goto out;
3479         }
3480         if (adm_ctx.volume > DRBD_VOLUME_MAX) {
3481                 drbd_msg_put_info(adm_ctx.reply_skb, "requested volume id out of range");
3482                 retcode = ERR_INVALID_REQUEST;
3483                 goto out;
3484         }
3485
3486         /* drbd_adm_prepare made sure already
3487          * that first_peer_device(device)->connection and device->vnr match the request. */
3488         if (adm_ctx.device) {
3489                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3490                         retcode = ERR_MINOR_OR_VOLUME_EXISTS;
3491                 /* else: still NO_ERROR */
3492                 goto out;
3493         }
3494
3495         mutex_lock(&adm_ctx.resource->adm_mutex);
3496         retcode = drbd_create_device(&adm_ctx, dh->minor);
3497         mutex_unlock(&adm_ctx.resource->adm_mutex);
3498 out:
3499         drbd_adm_finish(&adm_ctx, info, retcode);
3500         return 0;
3501 }
3502
3503 static enum drbd_ret_code adm_del_minor(struct drbd_device *device)
3504 {
3505         if (device->state.disk == D_DISKLESS &&
3506             /* no need to be device->state.conn == C_STANDALONE &&
3507              * we may want to delete a minor from a live replication group.
3508              */
3509             device->state.role == R_SECONDARY) {
3510                 _drbd_request_state(device, NS(conn, C_WF_REPORT_PARAMS),
3511                                     CS_VERBOSE + CS_WAIT_COMPLETE);
3512                 drbd_delete_device(device);
3513                 return NO_ERROR;
3514         } else
3515                 return ERR_MINOR_CONFIGURED;
3516 }
3517
3518 int drbd_adm_del_minor(struct sk_buff *skb, struct genl_info *info)
3519 {
3520         struct drbd_config_context adm_ctx;
3521         enum drbd_ret_code retcode;
3522
3523         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3524         if (!adm_ctx.reply_skb)
3525                 return retcode;
3526         if (retcode != NO_ERROR)
3527                 goto out;
3528
3529         mutex_lock(&adm_ctx.resource->adm_mutex);
3530         retcode = adm_del_minor(adm_ctx.device);
3531         mutex_unlock(&adm_ctx.resource->adm_mutex);
3532 out:
3533         drbd_adm_finish(&adm_ctx, info, retcode);
3534         return 0;
3535 }
3536
3537 static int adm_del_resource(struct drbd_resource *resource)
3538 {
3539         struct drbd_connection *connection;
3540
3541         for_each_connection(connection, resource) {
3542                 if (connection->cstate > C_STANDALONE)
3543                         return ERR_NET_CONFIGURED;
3544         }
3545         if (!idr_is_empty(&resource->devices))
3546                 return ERR_RES_IN_USE;
3547
3548         list_del_rcu(&resource->resources);
3549         /* Make sure all threads have actually stopped: state handling only
3550          * does drbd_thread_stop_nowait(). */
3551         list_for_each_entry(connection, &resource->connections, connections)
3552                 drbd_thread_stop(&connection->worker);
3553         synchronize_rcu();
3554         drbd_free_resource(resource);
3555         return NO_ERROR;
3556 }
3557
3558 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3559 {
3560         struct drbd_config_context adm_ctx;
3561         struct drbd_resource *resource;
3562         struct drbd_connection *connection;
3563         struct drbd_device *device;
3564         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
3565         unsigned i;
3566
3567         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
3568         if (!adm_ctx.reply_skb)
3569                 return retcode;
3570         if (retcode != NO_ERROR)
3571                 goto finish;
3572
3573         resource = adm_ctx.resource;
3574         mutex_lock(&resource->adm_mutex);
3575         /* demote */
3576         for_each_connection(connection, resource) {
3577                 struct drbd_peer_device *peer_device;
3578
3579                 idr_for_each_entry(&connection->peer_devices, peer_device, i) {
3580                         retcode = drbd_set_role(peer_device->device, R_SECONDARY, 0);
3581                         if (retcode < SS_SUCCESS) {
3582                                 drbd_msg_put_info(adm_ctx.reply_skb, "failed to demote");
3583                                 goto out;
3584                         }
3585                 }
3586
3587                 retcode = conn_try_disconnect(connection, 0);
3588                 if (retcode < SS_SUCCESS) {
3589                         drbd_msg_put_info(adm_ctx.reply_skb, "failed to disconnect");
3590                         goto out;
3591                 }
3592         }
3593
3594         /* detach */
3595         idr_for_each_entry(&resource->devices, device, i) {
3596                 retcode = adm_detach(device, 0);
3597                 if (retcode < SS_SUCCESS || retcode > NO_ERROR) {
3598                         drbd_msg_put_info(adm_ctx.reply_skb, "failed to detach");
3599                         goto out;
3600                 }
3601         }
3602
3603         /* delete volumes */
3604         idr_for_each_entry(&resource->devices, device, i) {
3605                 retcode = adm_del_minor(device);
3606                 if (retcode != NO_ERROR) {
3607                         /* "can not happen" */
3608                         drbd_msg_put_info(adm_ctx.reply_skb, "failed to delete volume");
3609                         goto out;
3610                 }
3611         }
3612
3613         retcode = adm_del_resource(resource);
3614 out:
3615         mutex_unlock(&resource->adm_mutex);
3616 finish:
3617         drbd_adm_finish(&adm_ctx, info, retcode);
3618         return 0;
3619 }
3620
3621 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
3622 {
3623         struct drbd_config_context adm_ctx;
3624         struct drbd_resource *resource;
3625         enum drbd_ret_code retcode;
3626
3627         retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
3628         if (!adm_ctx.reply_skb)
3629                 return retcode;
3630         if (retcode != NO_ERROR)
3631                 goto finish;
3632         resource = adm_ctx.resource;
3633
3634         mutex_lock(&resource->adm_mutex);
3635         retcode = adm_del_resource(resource);
3636         mutex_unlock(&resource->adm_mutex);
3637 finish:
3638         drbd_adm_finish(&adm_ctx, info, retcode);
3639         return 0;
3640 }
3641
3642 void drbd_bcast_event(struct drbd_device *device, const struct sib_info *sib)
3643 {
3644         static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3645         struct sk_buff *msg;
3646         struct drbd_genlmsghdr *d_out;
3647         unsigned seq;
3648         int err = -ENOMEM;
3649
3650         seq = atomic_inc_return(&drbd_genl_seq);
3651         msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3652         if (!msg)
3653                 goto failed;
3654
3655         err = -EMSGSIZE;
3656         d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3657         if (!d_out) /* cannot happen, but anyways. */
3658                 goto nla_put_failure;
3659         d_out->minor = device_to_minor(device);
3660         d_out->ret_code = NO_ERROR;
3661
3662         if (nla_put_status_info(msg, device, sib))
3663                 goto nla_put_failure;
3664         genlmsg_end(msg, d_out);
3665         err = drbd_genl_multicast_events(msg, 0);
3666         /* msg has been consumed or freed in netlink_broadcast() */
3667         if (err && err != -ESRCH)
3668                 goto failed;
3669
3670         return;
3671
3672 nla_put_failure:
3673         nlmsg_free(msg);
3674 failed:
3675         drbd_err(device, "Error %d while broadcasting event. "
3676                         "Event seq:%u sib_reason:%u\n",
3677                         err, seq, sib->sib_reason);
3678 }