drivers/block/drbd/drbd_nl.c

   1 /*
   2    drbd_nl.c
   3
   4    This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
   5
   6    Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
   7    Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
   8    Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
   9
  10    drbd is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2, or (at your option)
  13    any later version.
  14
  15    drbd is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with drbd; see the file COPYING.  If not, write to
  22    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/drbd.h>
  28 #include <linux/in.h>
  29 #include <linux/fs.h>
  30 #include <linux/file.h>
  31 #include <linux/slab.h>
  32 #include <linux/blkpg.h>
  33 #include <linux/cpumask.h>
  34 #include "drbd_int.h"
  35 #include "drbd_req.h"
  36 #include "drbd_wrappers.h"
  37 #include <asm/unaligned.h>
  38 #include <linux/drbd_limits.h>
  39 #include <linux/kthread.h>
  40
  41 #include <net/genetlink.h>
  42
  43 /* .doit */
  44 // int drbd_adm_create_resource(struct sk_buff *skb, struct genl_info *info);
  45 // int drbd_adm_delete_resource(struct sk_buff *skb, struct genl_info *info);
  46
  47 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info);
  48 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info);
  49
  50 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info);
  51 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info);
  52 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info);
  53
  54 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info);
  55 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info);
  56 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info);
  57 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info);
  58 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info);
  59 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info);
  60 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info);
  61 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info);
  62 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info);
  63 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info);
  64 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info);
  65 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info);
  66 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info);
  67 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info);
  68 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info);
  69 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info);
  70 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info);
  71 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info);
  72 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info);
  73 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info);
  74 /* .dumpit */
  75 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb);
  76
  77 #include <linux/drbd_genl_api.h>
  78 #include "drbd_nla.h"
  79 #include <linux/genl_magic_func.h>
  80
  81 /* used blkdev_get_by_path, to claim our meta data device(s) */
  82 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
  83
  84 /* Configuration is strictly serialized, because generic netlink message
  85  * processing is strictly serialized by the genl_lock().
  86  * Which means we can use one static global drbd_config_context struct.
  87  */
  88 static struct drbd_config_context {
  89         /* assigned from drbd_genlmsghdr */
  90         unsigned int minor;
  91         /* assigned from request attributes, if present */
  92         unsigned int volume;
  93 #define VOLUME_UNSPECIFIED              (-1U)
  94         /* pointer into the request skb,
  95          * limited lifetime! */
  96         char *resource_name;
  97         struct nlattr *my_addr;
  98         struct nlattr *peer_addr;
  99
 100         /* reply buffer */
 101         struct sk_buff *reply_skb;
 102         /* pointer into reply buffer */
 103         struct drbd_genlmsghdr *reply_dh;
 104         /* resolved from attributes, if possible */
 105         struct drbd_conf *mdev;
 106         struct drbd_tconn *tconn;
 107 } adm_ctx;
 108
 109 static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
 110 {
 111         genlmsg_end(skb, genlmsg_data(nlmsg_data(nlmsg_hdr(skb))));
 112         if (genlmsg_reply(skb, info))
 113                 printk(KERN_ERR "drbd: error sending genl reply\n");
 114 }
 115
 116 /* Used on a fresh "drbd_adm_prepare"d reply_skb, this cannot fail: The only
 117  * reason it could fail was no space in skb, and there are 4k available. */
 118 int drbd_msg_put_info(const char *info)
 119 {
 120         struct sk_buff *skb = adm_ctx.reply_skb;
 121         struct nlattr *nla;
 122         int err = -EMSGSIZE;
 123
 124         if (!info || !info[0])
 125                 return 0;
 126
 127         nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
 128         if (!nla)
 129                 return err;
 130
 131         err = nla_put_string(skb, T_info_text, info);
 132         if (err) {
 133                 nla_nest_cancel(skb, nla);
 134                 return err;
 135         } else
 136                 nla_nest_end(skb, nla);
 137         return 0;
 138 }
 139
 140 /* This would be a good candidate for a "pre_doit" hook,
 141  * and per-family private info->pointers.
 142  * But we need to stay compatible with older kernels.
 143  * If it returns successfully, adm_ctx members are valid.
 144  */
 145 #define DRBD_ADM_NEED_MINOR     1
 146 #define DRBD_ADM_NEED_RESOURCE  2
 147 #define DRBD_ADM_NEED_CONNECTION 4
 148 static int drbd_adm_prepare(struct sk_buff *skb, struct genl_info *info,
 149                 unsigned flags)
 150 {
 151         struct drbd_genlmsghdr *d_in = info->userhdr;
 152         const u8 cmd = info->genlhdr->cmd;
 153         int err;
 154
 155         memset(&adm_ctx, 0, sizeof(adm_ctx));
 156
 157         /* genl_rcv_msg only checks for CAP_NET_ADMIN on "GENL_ADMIN_PERM" :( */
 158         if (cmd != DRBD_ADM_GET_STATUS && !capable(CAP_NET_ADMIN))
 159                return -EPERM;
 160
 161         adm_ctx.reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 162         if (!adm_ctx.reply_skb) {
 163                 err = -ENOMEM;
 164                 goto fail;
 165         }
 166
 167         adm_ctx.reply_dh = genlmsg_put_reply(adm_ctx.reply_skb,
 168                                         info, &drbd_genl_family, 0, cmd);
 169         /* put of a few bytes into a fresh skb of >= 4k will always succeed.
 170          * but anyways */
 171         if (!adm_ctx.reply_dh) {
 172                 err = -ENOMEM;
 173                 goto fail;
 174         }
 175
 176         adm_ctx.reply_dh->minor = d_in->minor;
 177         adm_ctx.reply_dh->ret_code = NO_ERROR;
 178
 179         adm_ctx.volume = VOLUME_UNSPECIFIED;
 180         if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
 181                 struct nlattr *nla;
 182                 /* parse and validate only */
 183                 err = drbd_cfg_context_from_attrs(NULL, info);
 184                 if (err)
 185                         goto fail;
 186
 187                 /* It was present, and valid,
 188                  * copy it over to the reply skb. */
 189                 err = nla_put_nohdr(adm_ctx.reply_skb,
 190                                 info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
 191                                 info->attrs[DRBD_NLA_CFG_CONTEXT]);
 192                 if (err)
 193                         goto fail;
 194
 195                 /* and assign stuff to the global adm_ctx */
 196                 nla = nested_attr_tb[__nla_type(T_ctx_volume)];
 197                 if (nla)
 198                         adm_ctx.volume = nla_get_u32(nla);
 199                 nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
 200                 if (nla)
 201                         adm_ctx.resource_name = nla_data(nla);
 202                 adm_ctx.my_addr = nested_attr_tb[__nla_type(T_ctx_my_addr)];
 203                 adm_ctx.peer_addr = nested_attr_tb[__nla_type(T_ctx_peer_addr)];
 204                 if ((adm_ctx.my_addr &&
 205                      nla_len(adm_ctx.my_addr) > sizeof(adm_ctx.tconn->my_addr)) ||
 206                     (adm_ctx.peer_addr &&
 207                      nla_len(adm_ctx.peer_addr) > sizeof(adm_ctx.tconn->peer_addr))) {
 208                         err = -EINVAL;
 209                         goto fail;
 210                 }
 211         }
 212
 213         adm_ctx.minor = d_in->minor;
 214         adm_ctx.mdev = minor_to_mdev(d_in->minor);
 215         adm_ctx.tconn = conn_get_by_name(adm_ctx.resource_name);
 216
 217         if (!adm_ctx.mdev && (flags & DRBD_ADM_NEED_MINOR)) {
 218                 drbd_msg_put_info("unknown minor");
 219                 return ERR_MINOR_INVALID;
 220         }
 221         if (!adm_ctx.tconn && (flags & DRBD_ADM_NEED_RESOURCE)) {
 222                 drbd_msg_put_info("unknown resource");
 223                 return ERR_INVALID_REQUEST;
 224         }
 225
 226         if (flags & DRBD_ADM_NEED_CONNECTION) {
 227                 if (adm_ctx.tconn && !(flags & DRBD_ADM_NEED_RESOURCE)) {
 228                         drbd_msg_put_info("no resource name expected");
 229                         return ERR_INVALID_REQUEST;
 230                 }
 231                 if (adm_ctx.mdev) {
 232                         drbd_msg_put_info("no minor number expected");
 233                         return ERR_INVALID_REQUEST;
 234                 }
 235                 if (adm_ctx.my_addr && adm_ctx.peer_addr)
 236                         adm_ctx.tconn = conn_get_by_addrs(nla_data(adm_ctx.my_addr),
 237                                                           nla_len(adm_ctx.my_addr),
 238                                                           nla_data(adm_ctx.peer_addr),
 239                                                           nla_len(adm_ctx.peer_addr));
 240                 if (!adm_ctx.tconn) {
 241                         drbd_msg_put_info("unknown connection");
 242                         return ERR_INVALID_REQUEST;
 243                 }
 244         }
 245
 246         /* some more paranoia, if the request was over-determined */
 247         if (adm_ctx.mdev && adm_ctx.tconn &&
 248             adm_ctx.mdev->tconn != adm_ctx.tconn) {
 249                 pr_warning("request: minor=%u, resource=%s; but that minor belongs to connection %s\n",
 250                                 adm_ctx.minor, adm_ctx.resource_name,
 251                                 adm_ctx.mdev->tconn->name);
 252                 drbd_msg_put_info("minor exists in different resource");
 253                 return ERR_INVALID_REQUEST;
 254         }
 255         if (adm_ctx.mdev &&
 256             adm_ctx.volume != VOLUME_UNSPECIFIED &&
 257             adm_ctx.volume != adm_ctx.mdev->vnr) {
 258                 pr_warning("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
 259                                 adm_ctx.minor, adm_ctx.volume,
 260                                 adm_ctx.mdev->vnr, adm_ctx.mdev->tconn->name);
 261                 drbd_msg_put_info("minor exists as different volume");
 262                 return ERR_INVALID_REQUEST;
 263         }
 264
 265         return NO_ERROR;
 266
 267 fail:
 268         nlmsg_free(adm_ctx.reply_skb);
 269         adm_ctx.reply_skb = NULL;
 270         return err;
 271 }
 272
 273 static int drbd_adm_finish(struct genl_info *info, int retcode)
 274 {
 275         if (adm_ctx.tconn) {
 276                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
 277                 adm_ctx.tconn = NULL;
 278         }
 279
 280         if (!adm_ctx.reply_skb)
 281                 return -ENOMEM;
 282
 283         adm_ctx.reply_dh->ret_code = retcode;
 284         drbd_adm_send_reply(adm_ctx.reply_skb, info);
 285         return 0;
 286 }
 287
 288 static void setup_khelper_env(struct drbd_tconn *tconn, char **envp)
 289 {
 290         char *afs;
 291
 292         /* FIXME: A future version will not allow this case. */
 293         if (tconn->my_addr_len == 0 || tconn->peer_addr_len == 0)
 294                 return;
 295
 296         switch (((struct sockaddr *)&tconn->peer_addr)->sa_family) {
 297         case AF_INET6:
 298                 afs = "ipv6";
 299                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
 300                          &((struct sockaddr_in6 *)&tconn->peer_addr)->sin6_addr);
 301                 break;
 302         case AF_INET:
 303                 afs = "ipv4";
 304                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 305                          &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
 306                 break;
 307         default:
 308                 afs = "ssocks";
 309                 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 310                          &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
 311         }
 312         snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
 313 }
 314
 315 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
 316 {
 317         char *envp[] = { "HOME=/",
 318                         "TERM=linux",
 319                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 320                          (char[20]) { }, /* address family */
 321                          (char[60]) { }, /* address */
 322                         NULL };
 323         char mb[12];
 324         char *argv[] = {usermode_helper, cmd, mb, NULL };
 325         struct drbd_tconn *tconn = mdev->tconn;
 326         struct sib_info sib;
 327         int ret;
 328
 329         if (current == tconn->worker.task)
 330                 set_bit(CALLBACK_PENDING, &tconn->flags);
 331
 332         snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
 333         setup_khelper_env(tconn, envp);
 334
 335         /* The helper may take some time.
 336          * write out any unsynced meta data changes now */
 337         drbd_md_sync(mdev);
 338
 339         dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
 340         sib.sib_reason = SIB_HELPER_PRE;
 341         sib.helper_name = cmd;
 342         drbd_bcast_event(mdev, &sib);
 343         ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
 344         if (ret)
 345                 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 346                                 usermode_helper, cmd, mb,
 347                                 (ret >> 8) & 0xff, ret);
 348         else
 349                 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 350                                 usermode_helper, cmd, mb,
 351                                 (ret >> 8) & 0xff, ret);
 352         sib.sib_reason = SIB_HELPER_POST;
 353         sib.helper_exit_code = ret;
 354         drbd_bcast_event(mdev, &sib);
 355
 356         if (current == tconn->worker.task)
 357                 clear_bit(CALLBACK_PENDING, &tconn->flags);
 358
 359         if (ret < 0) /* Ignore any ERRNOs we got. */
 360                 ret = 0;
 361
 362         return ret;
 363 }
 364
 365 int conn_khelper(struct drbd_tconn *tconn, char *cmd)
 366 {
 367         char *envp[] = { "HOME=/",
 368                         "TERM=linux",
 369                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 370                          (char[20]) { }, /* address family */
 371                          (char[60]) { }, /* address */
 372                         NULL };
 373         char *argv[] = {usermode_helper, cmd, tconn->name, NULL };
 374         int ret;
 375
 376         setup_khelper_env(tconn, envp);
 377         conn_md_sync(tconn);
 378
 379         conn_info(tconn, "helper command: %s %s %s\n", usermode_helper, cmd, tconn->name);
 380         /* TODO: conn_bcast_event() ?? */
 381
 382         ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
 383         if (ret)
 384                 conn_warn(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 385                           usermode_helper, cmd, tconn->name,
 386                           (ret >> 8) & 0xff, ret);
 387         else
 388                 conn_info(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 389                           usermode_helper, cmd, tconn->name,
 390                           (ret >> 8) & 0xff, ret);
 391         /* TODO: conn_bcast_event() ?? */
 392
 393         if (ret < 0) /* Ignore any ERRNOs we got. */
 394                 ret = 0;
 395
 396         return ret;
 397 }
 398
 399 static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
 400 {
 401         enum drbd_fencing_p fp = FP_NOT_AVAIL;
 402         struct drbd_conf *mdev;
 403         int vnr;
 404
 405         rcu_read_lock();
 406         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
 407                 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
 408                         fp = max_t(enum drbd_fencing_p, fp,
 409                                    rcu_dereference(mdev->ldev->disk_conf)->fencing);
 410                         put_ldev(mdev);
 411                 }
 412         }
 413         rcu_read_unlock();
 414
 415         return fp;
 416 }
 417
 418 bool conn_try_outdate_peer(struct drbd_tconn *tconn)
 419 {
 420         union drbd_state mask = { };
 421         union drbd_state val = { };
 422         enum drbd_fencing_p fp;
 423         char *ex_to_string;
 424         int r;
 425
 426         if (tconn->cstate >= C_WF_REPORT_PARAMS) {
 427                 conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");
 428                 return false;
 429         }
 430
 431         fp = highest_fencing_policy(tconn);
 432         switch (fp) {
 433         case FP_NOT_AVAIL:
 434                 conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");
 435                 goto out;
 436         case FP_DONT_CARE:
 437                 return true;
 438         default: ;
 439         }
 440
 441         r = conn_khelper(tconn, "fence-peer");
 442
 443         switch ((r>>8) & 0xff) {
 444         case 3: /* peer is inconsistent */
 445                 ex_to_string = "peer is inconsistent or worse";
 446                 mask.pdsk = D_MASK;
 447                 val.pdsk = D_INCONSISTENT;
 448                 break;
 449         case 4: /* peer got outdated, or was already outdated */
 450                 ex_to_string = "peer was fenced";
 451                 mask.pdsk = D_MASK;
 452                 val.pdsk = D_OUTDATED;
 453                 break;
 454         case 5: /* peer was down */
 455                 if (conn_highest_disk(tconn) == D_UP_TO_DATE) {
 456                         /* we will(have) create(d) a new UUID anyways... */
 457                         ex_to_string = "peer is unreachable, assumed to be dead";
 458                         mask.pdsk = D_MASK;
 459                         val.pdsk = D_OUTDATED;
 460                 } else {
 461                         ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
 462                 }
 463                 break;
 464         case 6: /* Peer is primary, voluntarily outdate myself.
 465                  * This is useful when an unconnected R_SECONDARY is asked to
 466                  * become R_PRIMARY, but finds the other peer being active. */
 467                 ex_to_string = "peer is active";
 468                 conn_warn(tconn, "Peer is primary, outdating myself.\n");
 469                 mask.disk = D_MASK;
 470                 val.disk = D_OUTDATED;
 471                 break;
 472         case 7:
 473                 if (fp != FP_STONITH)
 474                         conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");
 475                 ex_to_string = "peer was stonithed";
 476                 mask.pdsk = D_MASK;
 477                 val.pdsk = D_OUTDATED;
 478                 break;
 479         default:
 480                 /* The script is broken ... */
 481                 conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
 482                 return false; /* Eventually leave IO frozen */
 483         }
 484
 485         conn_info(tconn, "fence-peer helper returned %d (%s)\n",
 486                   (r>>8) & 0xff, ex_to_string);
 487
 488  out:
 489
 490         /* Not using
 491            conn_request_state(tconn, mask, val, CS_VERBOSE);
 492            here, because we might were able to re-establish the connection in the
 493            meantime. */
 494         spin_lock_irq(&tconn->req_lock);
 495         if (tconn->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &tconn->flags))
 496                 _conn_request_state(tconn, mask, val, CS_VERBOSE);
 497         spin_unlock_irq(&tconn->req_lock);
 498
 499         return conn_highest_pdsk(tconn) <= D_OUTDATED;
 500 }
 501
 502 static int _try_outdate_peer_async(void *data)
 503 {
 504         struct drbd_tconn *tconn = (struct drbd_tconn *)data;
 505
 506         conn_try_outdate_peer(tconn);
 507
 508         kref_put(&tconn->kref, &conn_destroy);
 509         return 0;
 510 }
 511
 512 void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
 513 {
 514         struct task_struct *opa;
 515
 516         kref_get(&tconn->kref);
 517         opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
 518         if (IS_ERR(opa)) {
 519                 conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
 520                 kref_put(&tconn->kref, &conn_destroy);
 521         }
 522 }
 523
 524 enum drbd_state_rv
 525 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
 526 {
 527         const int max_tries = 4;
 528         enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
 529         struct net_conf *nc;
 530         int try = 0;
 531         int forced = 0;
 532         union drbd_state mask, val;
 533
 534         if (new_role == R_PRIMARY)
 535                 request_ping(mdev->tconn); /* Detect a dead peer ASAP */
 536
 537         mutex_lock(mdev->state_mutex);
 538
 539         mask.i = 0; mask.role = R_MASK;
 540         val.i  = 0; val.role  = new_role;
 541
 542         while (try++ < max_tries) {
 543                 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
 544
 545                 /* in case we first succeeded to outdate,
 546                  * but now suddenly could establish a connection */
 547                 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
 548                         val.pdsk = 0;
 549                         mask.pdsk = 0;
 550                         continue;
 551                 }
 552
 553                 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
 554                     (mdev->state.disk < D_UP_TO_DATE &&
 555                      mdev->state.disk >= D_INCONSISTENT)) {
 556                         mask.disk = D_MASK;
 557                         val.disk  = D_UP_TO_DATE;
 558                         forced = 1;
 559                         continue;
 560                 }
 561
 562                 if (rv == SS_NO_UP_TO_DATE_DISK &&
 563                     mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
 564                         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 565
 566                         if (conn_try_outdate_peer(mdev->tconn)) {
 567                                 val.disk = D_UP_TO_DATE;
 568                                 mask.disk = D_MASK;
 569                         }
 570                         continue;
 571                 }
 572
 573                 if (rv == SS_NOTHING_TO_DO)
 574                         goto out;
 575                 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
 576                         if (!conn_try_outdate_peer(mdev->tconn) && force) {
 577                                 dev_warn(DEV, "Forced into split brain situation!\n");
 578                                 mask.pdsk = D_MASK;
 579                                 val.pdsk  = D_OUTDATED;
 580
 581                         }
 582                         continue;
 583                 }
 584                 if (rv == SS_TWO_PRIMARIES) {
 585                         /* Maybe the peer is detected as dead very soon...
 586                            retry at most once more in this case. */
 587                         int timeo;
 588                         rcu_read_lock();
 589                         nc = rcu_dereference(mdev->tconn->net_conf);
 590                         timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
 591                         rcu_read_unlock();
 592                         schedule_timeout_interruptible(timeo);
 593                         if (try < max_tries)
 594                                 try = max_tries - 1;
 595                         continue;
 596                 }
 597                 if (rv < SS_SUCCESS) {
 598                         rv = _drbd_request_state(mdev, mask, val,
 599                                                 CS_VERBOSE + CS_WAIT_COMPLETE);
 600                         if (rv < SS_SUCCESS)
 601                                 goto out;
 602                 }
 603                 break;
 604         }
 605
 606         if (rv < SS_SUCCESS)
 607                 goto out;
 608
 609         if (forced)
 610                 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
 611
 612         /* Wait until nothing is on the fly :) */
 613         wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
 614
 615         /* FIXME also wait for all pending P_BARRIER_ACK? */
 616
 617         if (new_role == R_SECONDARY) {
 618                 set_disk_ro(mdev->vdisk, true);
 619                 if (get_ldev(mdev)) {
 620                         mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
 621                         put_ldev(mdev);
 622                 }
 623         } else {
 624                 mutex_lock(&mdev->tconn->conf_update);
 625                 nc = mdev->tconn->net_conf;
 626                 if (nc)
 627                         nc->discard_my_data = 0; /* without copy; single bit op is atomic */
 628                 mutex_unlock(&mdev->tconn->conf_update);
 629
 630                 set_disk_ro(mdev->vdisk, false);
 631                 if (get_ldev(mdev)) {
 632                         if (((mdev->state.conn < C_CONNECTED ||
 633                                mdev->state.pdsk <= D_FAILED)
 634                               && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
 635                                 drbd_uuid_new_current(mdev);
 636
 637                         mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
 638                         put_ldev(mdev);
 639                 }
 640         }
 641
 642         /* writeout of activity log covered areas of the bitmap
 643          * to stable storage done in after state change already */
 644
 645         if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
 646                 /* if this was forced, we should consider sync */
 647                 if (forced)
 648                         drbd_send_uuids(mdev);
 649                 drbd_send_current_state(mdev);
 650         }
 651
 652         drbd_md_sync(mdev);
 653
 654         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
 655 out:
 656         mutex_unlock(mdev->state_mutex);
 657         return rv;
 658 }
 659
 660 static const char *from_attrs_err_to_txt(int err)
 661 {
 662         return  err == -ENOMSG ? "required attribute missing" :
 663                 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
 664                 err == -EEXIST ? "can not change invariant setting" :
 665                 "invalid attribute value";
 666 }
 667
 668 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
 669 {
 670         struct set_role_parms parms;
 671         int err;
 672         enum drbd_ret_code retcode;
 673
 674         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
 675         if (!adm_ctx.reply_skb)
 676                 return retcode;
 677         if (retcode != NO_ERROR)
 678                 goto out;
 679
 680         memset(&parms, 0, sizeof(parms));
 681         if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
 682                 err = set_role_parms_from_attrs(&parms, info);
 683                 if (err) {
 684                         retcode = ERR_MANDATORY_TAG;
 685                         drbd_msg_put_info(from_attrs_err_to_txt(err));
 686                         goto out;
 687                 }
 688         }
 689
 690         if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
 691                 retcode = drbd_set_role(adm_ctx.mdev, R_PRIMARY, parms.assume_uptodate);
 692         else
 693                 retcode = drbd_set_role(adm_ctx.mdev, R_SECONDARY, 0);
 694 out:
 695         drbd_adm_finish(info, retcode);
 696         return 0;
 697 }
 698
 699 /* initializes the md.*_offset members, so we are able to find
 700  * the on disk meta data */
 701 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
 702                                        struct drbd_backing_dev *bdev)
 703 {
 704         sector_t md_size_sect = 0;
 705         int meta_dev_idx;
 706
 707         rcu_read_lock();
 708         meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
 709
 710         switch (meta_dev_idx) {
 711         default:
 712                 /* v07 style fixed size indexed meta data */
 713                 bdev->md.md_size_sect = MD_RESERVED_SECT;
 714                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 715                 bdev->md.al_offset = MD_AL_OFFSET;
 716                 bdev->md.bm_offset = MD_BM_OFFSET;
 717                 break;
 718         case DRBD_MD_INDEX_FLEX_EXT:
 719                 /* just occupy the full device; unit: sectors */
 720                 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
 721                 bdev->md.md_offset = 0;
 722                 bdev->md.al_offset = MD_AL_OFFSET;
 723                 bdev->md.bm_offset = MD_BM_OFFSET;
 724                 break;
 725         case DRBD_MD_INDEX_INTERNAL:
 726         case DRBD_MD_INDEX_FLEX_INT:
 727                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 728                 /* al size is still fixed */
 729                 bdev->md.al_offset = -MD_AL_SECTORS;
 730                 /* we need (slightly less than) ~ this much bitmap sectors: */
 731                 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
 732                 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
 733                 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
 734                 md_size_sect = ALIGN(md_size_sect, 8);
 735
 736                 /* plus the "drbd meta data super block",
 737                  * and the activity log; */
 738                 md_size_sect += MD_BM_OFFSET;
 739
 740                 bdev->md.md_size_sect = md_size_sect;
 741                 /* bitmap offset is adjusted by 'super' block size */
 742                 bdev->md.bm_offset   = -md_size_sect + MD_AL_OFFSET;
 743                 break;
 744         }
 745         rcu_read_unlock();
 746 }
 747
 748 /* input size is expected to be in KB */
 749 char *ppsize(char *buf, unsigned long long size)
 750 {
 751         /* Needs 9 bytes at max including trailing NUL:
 752          * -1ULL ==> "16384 EB" */
 753         static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
 754         int base = 0;
 755         while (size >= 10000 && base < sizeof(units)-1) {
 756                 /* shift + round */
 757                 size = (size >> 10) + !!(size & (1<<9));
 758                 base++;
 759         }
 760         sprintf(buf, "%u %cB", (unsigned)size, units[base]);
 761
 762         return buf;
 763 }
 764
 765 /* there is still a theoretical deadlock when called from receiver
 766  * on an D_INCONSISTENT R_PRIMARY:
 767  *  remote READ does inc_ap_bio, receiver would need to receive answer
 768  *  packet from remote to dec_ap_bio again.
 769  *  receiver receive_sizes(), comes here,
 770  *  waits for ap_bio_cnt == 0. -> deadlock.
 771  * but this cannot happen, actually, because:
 772  *  R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
 773  *  (not connected, or bad/no disk on peer):
 774  *  see drbd_fail_request_early, ap_bio_cnt is zero.
 775  *  R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
 776  *  peer may not initiate a resize.
 777  */
 778 /* Note these are not to be confused with
 779  * drbd_adm_suspend_io/drbd_adm_resume_io,
 780  * which are (sub) state changes triggered by admin (drbdsetup),
 781  * and can be long lived.
 782  * This changes an mdev->flag, is triggered by drbd internals,
 783  * and should be short-lived. */
 784 void drbd_suspend_io(struct drbd_conf *mdev)
 785 {
 786         set_bit(SUSPEND_IO, &mdev->flags);
 787         if (drbd_suspended(mdev))
 788                 return;
 789         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
 790 }
 791
 792 void drbd_resume_io(struct drbd_conf *mdev)
 793 {
 794         clear_bit(SUSPEND_IO, &mdev->flags);
 795         wake_up(&mdev->misc_wait);
 796 }
 797
 798 /**
 799  * drbd_determine_dev_size() -  Sets the right device size obeying all constraints
 800  * @mdev:       DRBD device.
 801  *
 802  * Returns 0 on success, negative return values indicate errors.
 803  * You should call drbd_md_sync() after calling this function.
 804  */
 805 enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
 806 {
 807         sector_t prev_first_sect, prev_size; /* previous meta location */
 808         sector_t la_size, u_size;
 809         sector_t size;
 810         char ppb[10];
 811
 812         int md_moved, la_size_changed;
 813         enum determine_dev_size rv = unchanged;
 814
 815         /* race:
 816          * application request passes inc_ap_bio,
 817          * but then cannot get an AL-reference.
 818          * this function later may wait on ap_bio_cnt == 0. -> deadlock.
 819          *
 820          * to avoid that:
 821          * Suspend IO right here.
 822          * still lock the act_log to not trigger ASSERTs there.
 823          */
 824         drbd_suspend_io(mdev);
 825
 826         /* no wait necessary anymore, actually we could assert that */
 827         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
 828
 829         prev_first_sect = drbd_md_first_sector(mdev->ldev);
 830         prev_size = mdev->ldev->md.md_size_sect;
 831         la_size = mdev->ldev->md.la_size_sect;
 832
 833         /* TODO: should only be some assert here, not (re)init... */
 834         drbd_md_set_sector_offsets(mdev, mdev->ldev);
 835
 836         rcu_read_lock();
 837         u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
 838         rcu_read_unlock();
 839         size = drbd_new_dev_size(mdev, mdev->ldev, u_size, flags & DDSF_FORCED);
 840
 841         if (drbd_get_capacity(mdev->this_bdev) != size ||
 842             drbd_bm_capacity(mdev) != size) {
 843                 int err;
 844                 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
 845                 if (unlikely(err)) {
 846                         /* currently there is only one error: ENOMEM! */
 847                         size = drbd_bm_capacity(mdev)>>1;
 848                         if (size == 0) {
 849                                 dev_err(DEV, "OUT OF MEMORY! "
 850                                     "Could not allocate bitmap!\n");
 851                         } else {
 852                                 dev_err(DEV, "BM resizing failed. "
 853                                     "Leaving size unchanged at size = %lu KB\n",
 854                                     (unsigned long)size);
 855                         }
 856                         rv = dev_size_error;
 857                 }
 858                 /* racy, see comments above. */
 859                 drbd_set_my_capacity(mdev, size);
 860                 mdev->ldev->md.la_size_sect = size;
 861                 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
 862                      (unsigned long long)size>>1);
 863         }
 864         if (rv == dev_size_error)
 865                 goto out;
 866
 867         la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
 868
 869         md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
 870                 || prev_size       != mdev->ldev->md.md_size_sect;
 871
 872         if (la_size_changed || md_moved) {
 873                 int err;
 874
 875                 drbd_al_shrink(mdev); /* All extents inactive. */
 876                 dev_info(DEV, "Writing the whole bitmap, %s\n",
 877                          la_size_changed && md_moved ? "size changed and md moved" :
 878                          la_size_changed ? "size changed" : "md moved");
 879                 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
 880                 err = drbd_bitmap_io(mdev, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
 881                                      "size changed", BM_LOCKED_MASK);
 882                 if (err) {
 883                         rv = dev_size_error;
 884                         goto out;
 885                 }
 886                 drbd_md_mark_dirty(mdev);
 887         }
 888
 889         if (size > la_size)
 890                 rv = grew;
 891         if (size < la_size)
 892                 rv = shrunk;
 893 out:
 894         lc_unlock(mdev->act_log);
 895         wake_up(&mdev->al_wait);
 896         drbd_resume_io(mdev);
 897
 898         return rv;
 899 }
 900
 901 sector_t
 902 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
 903                   sector_t u_size, int assume_peer_has_space)
 904 {
 905         sector_t p_size = mdev->p_size;   /* partner's disk size. */
 906         sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
 907         sector_t m_size; /* my size */
 908         sector_t size = 0;
 909
 910         m_size = drbd_get_max_capacity(bdev);
 911
 912         if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
 913                 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
 914                 p_size = m_size;
 915         }
 916
 917         if (p_size && m_size) {
 918                 size = min_t(sector_t, p_size, m_size);
 919         } else {
 920                 if (la_size) {
 921                         size = la_size;
 922                         if (m_size && m_size < size)
 923                                 size = m_size;
 924                         if (p_size && p_size < size)
 925                                 size = p_size;
 926                 } else {
 927                         if (m_size)
 928                                 size = m_size;
 929                         if (p_size)
 930                                 size = p_size;
 931                 }
 932         }
 933
 934         if (size == 0)
 935                 dev_err(DEV, "Both nodes diskless!\n");
 936
 937         if (u_size) {
 938                 if (u_size > size)
 939                         dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
 940                             (unsigned long)u_size>>1, (unsigned long)size>>1);
 941                 else
 942                         size = u_size;
 943         }
 944
 945         return size;
 946 }
 947
 948 /**
 949  * drbd_check_al_size() - Ensures that the AL is of the right size
 950  * @mdev:       DRBD device.
 951  *
 952  * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
 953  * failed, and 0 on success. You should call drbd_md_sync() after you called
 954  * this function.
 955  */
 956 static int drbd_check_al_size(struct drbd_conf *mdev, struct disk_conf *dc)
 957 {
 958         struct lru_cache *n, *t;
 959         struct lc_element *e;
 960         unsigned int in_use;
 961         int i;
 962
 963         if (mdev->act_log &&
 964             mdev->act_log->nr_elements == dc->al_extents)
 965                 return 0;
 966
 967         in_use = 0;
 968         t = mdev->act_log;
 969         n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
 970                 dc->al_extents, sizeof(struct lc_element), 0);
 971
 972         if (n == NULL) {
 973                 dev_err(DEV, "Cannot allocate act_log lru!\n");
 974                 return -ENOMEM;
 975         }
 976         spin_lock_irq(&mdev->al_lock);
 977         if (t) {
 978                 for (i = 0; i < t->nr_elements; i++) {
 979                         e = lc_element_by_index(t, i);
 980                         if (e->refcnt)
 981                                 dev_err(DEV, "refcnt(%d)==%d\n",
 982                                     e->lc_number, e->refcnt);
 983                         in_use += e->refcnt;
 984                 }
 985         }
 986         if (!in_use)
 987                 mdev->act_log = n;
 988         spin_unlock_irq(&mdev->al_lock);
 989         if (in_use) {
 990                 dev_err(DEV, "Activity log still in use!\n");
 991                 lc_destroy(n);
 992                 return -EBUSY;
 993         } else {
 994                 if (t)
 995                         lc_destroy(t);
 996         }
 997         drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
 998         return 0;
 999 }
1000
1001 static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
1002 {
1003         struct request_queue * const q = mdev->rq_queue;
1004         unsigned int max_hw_sectors = max_bio_size >> 9;
1005         unsigned int max_segments = 0;
1006
1007         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1008                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1009
1010                 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
1011                 rcu_read_lock();
1012                 max_segments = rcu_dereference(mdev->ldev->disk_conf)->max_bio_bvecs;
1013                 rcu_read_unlock();
1014                 put_ldev(mdev);
1015         }
1016
1017         blk_queue_logical_block_size(q, 512);
1018         blk_queue_max_hw_sectors(q, max_hw_sectors);
1019         /* This is the workaround for "bio would need to, but cannot, be split" */
1020         blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1021         blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
1022
1023         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1024                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1025
1026                 blk_queue_stack_limits(q, b);
1027
1028                 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
1029                         dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
1030                                  q->backing_dev_info.ra_pages,
1031                                  b->backing_dev_info.ra_pages);
1032                         q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1033                 }
1034                 put_ldev(mdev);
1035         }
1036 }
1037
1038 void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
1039 {
1040         unsigned int now, new, local, peer;
1041
1042         now = queue_max_hw_sectors(mdev->rq_queue) << 9;
1043         local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
1044         peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
1045
1046         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1047                 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
1048                 mdev->local_max_bio_size = local;
1049                 put_ldev(mdev);
1050         }
1051         local = min(local, DRBD_MAX_BIO_SIZE);
1052
1053         /* We may ignore peer limits if the peer is modern enough.
1054            Because new from 8.3.8 onwards the peer can use multiple
1055            BIOs for a single peer_request */
1056         if (mdev->state.conn >= C_CONNECTED) {
1057                 if (mdev->tconn->agreed_pro_version < 94)
1058                         peer = min( mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
1059                         /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
1060                 else if (mdev->tconn->agreed_pro_version == 94)
1061                         peer = DRBD_MAX_SIZE_H80_PACKET;
1062                 else if (mdev->tconn->agreed_pro_version < 100)
1063                         peer = DRBD_MAX_BIO_SIZE_P95;  /* drbd 8.3.8 onwards, before 8.4.0 */
1064                 else
1065                         peer = DRBD_MAX_BIO_SIZE;
1066         }
1067
1068         new = min(local, peer);
1069
1070         if (mdev->state.role == R_PRIMARY && new < now)
1071                 dev_err(DEV, "ASSERT FAILED new < now; (%u < %u)\n", new, now);
1072
1073         if (new != now)
1074                 dev_info(DEV, "max BIO size = %u\n", new);
1075
1076         drbd_setup_queue_param(mdev, new);
1077 }
1078
1079 /* Starts the worker thread */
1080 static void conn_reconfig_start(struct drbd_tconn *tconn)
1081 {
1082         drbd_thread_start(&tconn->worker);
1083         conn_flush_workqueue(tconn);
1084 }
1085
1086 /* if still unconfigured, stops worker again. */
1087 static void conn_reconfig_done(struct drbd_tconn *tconn)
1088 {
1089         bool stop_threads;
1090         spin_lock_irq(&tconn->req_lock);
1091         stop_threads = conn_all_vols_unconf(tconn) &&
1092                 tconn->cstate == C_STANDALONE;
1093         spin_unlock_irq(&tconn->req_lock);
1094         if (stop_threads) {
1095                 /* asender is implicitly stopped by receiver
1096                  * in conn_disconnect() */
1097                 drbd_thread_stop(&tconn->receiver);
1098                 drbd_thread_stop(&tconn->worker);
1099         }
1100 }
1101
1102 /* Make sure IO is suspended before calling this function(). */
1103 static void drbd_suspend_al(struct drbd_conf *mdev)
1104 {
1105         int s = 0;
1106
1107         if (!lc_try_lock(mdev->act_log)) {
1108                 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
1109                 return;
1110         }
1111
1112         drbd_al_shrink(mdev);
1113         spin_lock_irq(&mdev->tconn->req_lock);
1114         if (mdev->state.conn < C_CONNECTED)
1115                 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
1116         spin_unlock_irq(&mdev->tconn->req_lock);
1117         lc_unlock(mdev->act_log);
1118
1119         if (s)
1120                 dev_info(DEV, "Suspended AL updates\n");
1121 }
1122
1123
1124 static bool should_set_defaults(struct genl_info *info)
1125 {
1126         unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1127         return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1128 }
1129
1130 static void enforce_disk_conf_limits(struct disk_conf *dc)
1131 {
1132         if (dc->al_extents < DRBD_AL_EXTENTS_MIN)
1133                 dc->al_extents = DRBD_AL_EXTENTS_MIN;
1134         if (dc->al_extents > DRBD_AL_EXTENTS_MAX)
1135                 dc->al_extents = DRBD_AL_EXTENTS_MAX;
1136
1137         if (dc->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1138                 dc->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1139 }
1140
1141 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1142 {
1143         enum drbd_ret_code retcode;
1144         struct drbd_conf *mdev;
1145         struct disk_conf *new_disk_conf, *old_disk_conf;
1146         struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
1147         int err, fifo_size;
1148
1149         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1150         if (!adm_ctx.reply_skb)
1151                 return retcode;
1152         if (retcode != NO_ERROR)
1153                 goto out;
1154
1155         mdev = adm_ctx.mdev;
1156
1157         /* we also need a disk
1158          * to change the options on */
1159         if (!get_ldev(mdev)) {
1160                 retcode = ERR_NO_DISK;
1161                 goto out;
1162         }
1163
1164         new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
1165         if (!new_disk_conf) {
1166                 retcode = ERR_NOMEM;
1167                 goto fail;
1168         }
1169
1170         mutex_lock(&mdev->tconn->conf_update);
1171         old_disk_conf = mdev->ldev->disk_conf;
1172         *new_disk_conf = *old_disk_conf;
1173         if (should_set_defaults(info))
1174                 set_disk_conf_defaults(new_disk_conf);
1175
1176         err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1177         if (err && err != -ENOMSG) {
1178                 retcode = ERR_MANDATORY_TAG;
1179                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1180         }
1181
1182         if (!expect(new_disk_conf->resync_rate >= 1))
1183                 new_disk_conf->resync_rate = 1;
1184
1185         enforce_disk_conf_limits(new_disk_conf);
1186
1187         fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1188         if (fifo_size != mdev->rs_plan_s->size) {
1189                 new_plan = fifo_alloc(fifo_size);
1190                 if (!new_plan) {
1191                         dev_err(DEV, "kmalloc of fifo_buffer failed");
1192                         retcode = ERR_NOMEM;
1193                         goto fail_unlock;
1194                 }
1195         }
1196
1197         drbd_suspend_io(mdev);
1198         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1199         drbd_al_shrink(mdev);
1200         err = drbd_check_al_size(mdev, new_disk_conf);
1201         lc_unlock(mdev->act_log);
1202         wake_up(&mdev->al_wait);
1203         drbd_resume_io(mdev);
1204
1205         if (err) {
1206                 retcode = ERR_NOMEM;
1207                 goto fail_unlock;
1208         }
1209
1210         write_lock_irq(&global_state_lock);
1211         retcode = drbd_resync_after_valid(mdev, new_disk_conf->resync_after);
1212         if (retcode == NO_ERROR) {
1213                 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
1214                 drbd_resync_after_changed(mdev);
1215         }
1216         write_unlock_irq(&global_state_lock);
1217
1218         if (retcode != NO_ERROR)
1219                 goto fail_unlock;
1220
1221         if (new_plan) {
1222                 old_plan = mdev->rs_plan_s;
1223                 rcu_assign_pointer(mdev->rs_plan_s, new_plan);
1224         }
1225
1226         mutex_unlock(&mdev->tconn->conf_update);
1227
1228         if (new_disk_conf->al_updates)
1229                 mdev->ldev->md.flags &= ~MDF_AL_DISABLED;
1230         else
1231                 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1232
1233         if (new_disk_conf->md_flushes)
1234                 clear_bit(MD_NO_FUA, &mdev->flags);
1235         else
1236                 set_bit(MD_NO_FUA, &mdev->flags);
1237
1238         drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1239
1240         drbd_md_sync(mdev);
1241
1242         if (mdev->state.conn >= C_CONNECTED)
1243                 drbd_send_sync_param(mdev);
1244
1245         synchronize_rcu();
1246         kfree(old_disk_conf);
1247         kfree(old_plan);
1248         mod_timer(&mdev->request_timer, jiffies + HZ);
1249         goto success;
1250
1251 fail_unlock:
1252         mutex_unlock(&mdev->tconn->conf_update);
1253  fail:
1254         kfree(new_disk_conf);
1255         kfree(new_plan);
1256 success:
1257         put_ldev(mdev);
1258  out:
1259         drbd_adm_finish(info, retcode);
1260         return 0;
1261 }
1262
1263 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1264 {
1265         struct drbd_conf *mdev;
1266         int err;
1267         enum drbd_ret_code retcode;
1268         enum determine_dev_size dd;
1269         sector_t max_possible_sectors;
1270         sector_t min_md_device_sectors;
1271         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1272         struct disk_conf *new_disk_conf = NULL;
1273         struct block_device *bdev;
1274         struct lru_cache *resync_lru = NULL;
1275         struct fifo_buffer *new_plan = NULL;
1276         union drbd_state ns, os;
1277         enum drbd_state_rv rv;
1278         struct net_conf *nc;
1279
1280         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1281         if (!adm_ctx.reply_skb)
1282                 return retcode;
1283         if (retcode != NO_ERROR)
1284                 goto finish;
1285
1286         mdev = adm_ctx.mdev;
1287         conn_reconfig_start(mdev->tconn);
1288
1289         /* if you want to reconfigure, please tear down first */
1290         if (mdev->state.disk > D_DISKLESS) {
1291                 retcode = ERR_DISK_CONFIGURED;
1292                 goto fail;
1293         }
1294         /* It may just now have detached because of IO error.  Make sure
1295          * drbd_ldev_destroy is done already, we may end up here very fast,
1296          * e.g. if someone calls attach from the on-io-error handler,
1297          * to realize a "hot spare" feature (not that I'd recommend that) */
1298         wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1299
1300         /* make sure there is no leftover from previous force-detach attempts */
1301         clear_bit(FORCE_DETACH, &mdev->flags);
1302         clear_bit(WAS_IO_ERROR, &mdev->flags);
1303         clear_bit(WAS_READ_ERROR, &mdev->flags);
1304
1305         /* and no leftover from previously aborted resync or verify, either */
1306         mdev->rs_total = 0;
1307         mdev->rs_failed = 0;
1308         atomic_set(&mdev->rs_pending_cnt, 0);
1309
1310         /* allocation not in the IO path, drbdsetup context */
1311         nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1312         if (!nbc) {
1313                 retcode = ERR_NOMEM;
1314                 goto fail;
1315         }
1316         spin_lock_init(&nbc->md.uuid_lock);
1317
1318         new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1319         if (!new_disk_conf) {
1320                 retcode = ERR_NOMEM;
1321                 goto fail;
1322         }
1323         nbc->disk_conf = new_disk_conf;
1324
1325         set_disk_conf_defaults(new_disk_conf);
1326         err = disk_conf_from_attrs(new_disk_conf, info);
1327         if (err) {
1328                 retcode = ERR_MANDATORY_TAG;
1329                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1330                 goto fail;
1331         }
1332
1333         enforce_disk_conf_limits(new_disk_conf);
1334
1335         new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1336         if (!new_plan) {
1337                 retcode = ERR_NOMEM;
1338                 goto fail;
1339         }
1340
1341         if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1342                 retcode = ERR_MD_IDX_INVALID;
1343                 goto fail;
1344         }
1345
1346         rcu_read_lock();
1347         nc = rcu_dereference(mdev->tconn->net_conf);
1348         if (nc) {
1349                 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1350                         rcu_read_unlock();
1351                         retcode = ERR_STONITH_AND_PROT_A;
1352                         goto fail;
1353                 }
1354         }
1355         rcu_read_unlock();
1356
1357         bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
1358                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
1359         if (IS_ERR(bdev)) {
1360                 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
1361                         PTR_ERR(bdev));
1362                 retcode = ERR_OPEN_DISK;
1363                 goto fail;
1364         }
1365         nbc->backing_bdev = bdev;
1366
1367         /*
1368          * meta_dev_idx >= 0: external fixed size, possibly multiple
1369          * drbd sharing one meta device.  TODO in that case, paranoia
1370          * check that [md_bdev, meta_dev_idx] is not yet used by some
1371          * other drbd minor!  (if you use drbd.conf + drbdadm, that
1372          * should check it for you already; but if you don't, or
1373          * someone fooled it, we need to double check here)
1374          */
1375         bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
1376                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1377                                   (new_disk_conf->meta_dev_idx < 0) ?
1378                                   (void *)mdev : (void *)drbd_m_holder);
1379         if (IS_ERR(bdev)) {
1380                 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
1381                         PTR_ERR(bdev));
1382                 retcode = ERR_OPEN_MD_DISK;
1383                 goto fail;
1384         }
1385         nbc->md_bdev = bdev;
1386
1387         if ((nbc->backing_bdev == nbc->md_bdev) !=
1388             (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1389              new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1390                 retcode = ERR_MD_IDX_INVALID;
1391                 goto fail;
1392         }
1393
1394         resync_lru = lc_create("resync", drbd_bm_ext_cache,
1395                         1, 61, sizeof(struct bm_extent),
1396                         offsetof(struct bm_extent, lce));
1397         if (!resync_lru) {
1398                 retcode = ERR_NOMEM;
1399                 goto fail;
1400         }
1401
1402         /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1403         drbd_md_set_sector_offsets(mdev, nbc);
1404
1405         if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
1406                 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1407                         (unsigned long long) drbd_get_max_capacity(nbc),
1408                         (unsigned long long) new_disk_conf->disk_size);
1409                 retcode = ERR_DISK_TOO_SMALL;
1410                 goto fail;
1411         }
1412
1413         if (new_disk_conf->meta_dev_idx < 0) {
1414                 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1415                 /* at least one MB, otherwise it does not make sense */
1416                 min_md_device_sectors = (2<<10);
1417         } else {
1418                 max_possible_sectors = DRBD_MAX_SECTORS;
1419                 min_md_device_sectors = MD_RESERVED_SECT * (new_disk_conf->meta_dev_idx + 1);
1420         }
1421
1422         if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1423                 retcode = ERR_MD_DISK_TOO_SMALL;
1424                 dev_warn(DEV, "refusing attach: md-device too small, "
1425                      "at least %llu sectors needed for this meta-disk type\n",
1426                      (unsigned long long) min_md_device_sectors);
1427                 goto fail;
1428         }
1429
1430         /* Make sure the new disk is big enough
1431          * (we may currently be R_PRIMARY with no local disk...) */
1432         if (drbd_get_max_capacity(nbc) <
1433             drbd_get_capacity(mdev->this_bdev)) {
1434                 retcode = ERR_DISK_TOO_SMALL;
1435                 goto fail;
1436         }
1437
1438         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1439
1440         if (nbc->known_size > max_possible_sectors) {
1441                 dev_warn(DEV, "==> truncating very big lower level device "
1442                         "to currently maximum possible %llu sectors <==\n",
1443                         (unsigned long long) max_possible_sectors);
1444                 if (new_disk_conf->meta_dev_idx >= 0)
1445                         dev_warn(DEV, "==>> using internal or flexible "
1446                                       "meta data may help <<==\n");
1447         }
1448
1449         drbd_suspend_io(mdev);
1450         /* also wait for the last barrier ack. */
1451         /* FIXME see also https://daiquiri.linbit/cgi-bin/bugzilla/show_bug.cgi?id=171
1452          * We need a way to either ignore barrier acks for barriers sent before a device
1453          * was attached, or a way to wait for all pending barrier acks to come in.
1454          * As barriers are counted per resource,
1455          * we'd need to suspend io on all devices of a resource.
1456          */
1457         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || drbd_suspended(mdev));
1458         /* and for any other previously queued work */
1459         drbd_flush_workqueue(mdev);
1460
1461         rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1462         retcode = rv;  /* FIXME: Type mismatch. */
1463         drbd_resume_io(mdev);
1464         if (rv < SS_SUCCESS)
1465                 goto fail;
1466
1467         if (!get_ldev_if_state(mdev, D_ATTACHING))
1468                 goto force_diskless;
1469
1470         drbd_md_set_sector_offsets(mdev, nbc);
1471
1472         if (!mdev->bitmap) {
1473                 if (drbd_bm_init(mdev)) {
1474                         retcode = ERR_NOMEM;
1475                         goto force_diskless_dec;
1476                 }
1477         }
1478
1479         retcode = drbd_md_read(mdev, nbc);
1480         if (retcode != NO_ERROR)
1481                 goto force_diskless_dec;
1482
1483         if (mdev->state.conn < C_CONNECTED &&
1484             mdev->state.role == R_PRIMARY &&
1485             (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1486                 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1487                     (unsigned long long)mdev->ed_uuid);
1488                 retcode = ERR_DATA_NOT_CURRENT;
1489                 goto force_diskless_dec;
1490         }
1491
1492         /* Since we are diskless, fix the activity log first... */
1493         if (drbd_check_al_size(mdev, new_disk_conf)) {
1494                 retcode = ERR_NOMEM;
1495                 goto force_diskless_dec;
1496         }
1497
1498         /* Prevent shrinking of consistent devices ! */
1499         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1500             drbd_new_dev_size(mdev, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
1501                 dev_warn(DEV, "refusing to truncate a consistent device\n");
1502                 retcode = ERR_DISK_TOO_SMALL;
1503                 goto force_diskless_dec;
1504         }
1505
1506         /* Reset the "barriers don't work" bits here, then force meta data to
1507          * be written, to ensure we determine if barriers are supported. */
1508         if (new_disk_conf->md_flushes)
1509                 clear_bit(MD_NO_FUA, &mdev->flags);
1510         else
1511                 set_bit(MD_NO_FUA, &mdev->flags);
1512
1513         /* Point of no return reached.
1514          * Devices and memory are no longer released by error cleanup below.
1515          * now mdev takes over responsibility, and the state engine should
1516          * clean it up somewhere.  */
1517         D_ASSERT(mdev->ldev == NULL);
1518         mdev->ldev = nbc;
1519         mdev->resync = resync_lru;
1520         mdev->rs_plan_s = new_plan;
1521         nbc = NULL;
1522         resync_lru = NULL;
1523         new_disk_conf = NULL;
1524         new_plan = NULL;
1525
1526         drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1527
1528         if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1529                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1530         else
1531                 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1532
1533         if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1534             !(mdev->state.role == R_PRIMARY && mdev->tconn->susp_nod))
1535                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1536
1537         mdev->send_cnt = 0;
1538         mdev->recv_cnt = 0;
1539         mdev->read_cnt = 0;
1540         mdev->writ_cnt = 0;
1541
1542         drbd_reconsider_max_bio_size(mdev);
1543
1544         /* If I am currently not R_PRIMARY,
1545          * but meta data primary indicator is set,
1546          * I just now recover from a hard crash,
1547          * and have been R_PRIMARY before that crash.
1548          *
1549          * Now, if I had no connection before that crash
1550          * (have been degraded R_PRIMARY), chances are that
1551          * I won't find my peer now either.
1552          *
1553          * In that case, and _only_ in that case,
1554          * we use the degr-wfc-timeout instead of the default,
1555          * so we can automatically recover from a crash of a
1556          * degraded but active "cluster" after a certain timeout.
1557          */
1558         clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1559         if (mdev->state.role != R_PRIMARY &&
1560              drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1561             !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1562                 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1563
1564         dd = drbd_determine_dev_size(mdev, 0);
1565         if (dd == dev_size_error) {
1566                 retcode = ERR_NOMEM_BITMAP;
1567                 goto force_diskless_dec;
1568         } else if (dd == grew)
1569                 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1570
1571         if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC) ||
1572             (test_bit(CRASHED_PRIMARY, &mdev->flags) &&
1573              drbd_md_test_flag(mdev->ldev, MDF_AL_DISABLED))) {
1574                 dev_info(DEV, "Assuming that all blocks are out of sync "
1575                      "(aka FullSync)\n");
1576                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1577                         "set_n_write from attaching", BM_LOCKED_MASK)) {
1578                         retcode = ERR_IO_MD_DISK;
1579                         goto force_diskless_dec;
1580                 }
1581         } else {
1582                 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1583                         "read from attaching", BM_LOCKED_MASK)) {
1584                         retcode = ERR_IO_MD_DISK;
1585                         goto force_diskless_dec;
1586                 }
1587         }
1588
1589         if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1590                 drbd_suspend_al(mdev); /* IO is still suspended here... */
1591
1592         spin_lock_irq(&mdev->tconn->req_lock);
1593         os = drbd_read_state(mdev);
1594         ns = os;
1595         /* If MDF_CONSISTENT is not set go into inconsistent state,
1596            otherwise investigate MDF_WasUpToDate...
1597            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1598            otherwise into D_CONSISTENT state.
1599         */
1600         if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1601                 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1602                         ns.disk = D_CONSISTENT;
1603                 else
1604                         ns.disk = D_OUTDATED;
1605         } else {
1606                 ns.disk = D_INCONSISTENT;
1607         }
1608
1609         if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1610                 ns.pdsk = D_OUTDATED;
1611
1612         rcu_read_lock();
1613         if (ns.disk == D_CONSISTENT &&
1614             (ns.pdsk == D_OUTDATED || rcu_dereference(mdev->ldev->disk_conf)->fencing == FP_DONT_CARE))
1615                 ns.disk = D_UP_TO_DATE;
1616
1617         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1618            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1619            this point, because drbd_request_state() modifies these
1620            flags. */
1621
1622         if (rcu_dereference(mdev->ldev->disk_conf)->al_updates)
1623                 mdev->ldev->md.flags &= ~MDF_AL_DISABLED;
1624         else
1625                 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1626
1627         rcu_read_unlock();
1628
1629         /* In case we are C_CONNECTED postpone any decision on the new disk
1630            state after the negotiation phase. */
1631         if (mdev->state.conn == C_CONNECTED) {
1632                 mdev->new_state_tmp.i = ns.i;
1633                 ns.i = os.i;
1634                 ns.disk = D_NEGOTIATING;
1635
1636                 /* We expect to receive up-to-date UUIDs soon.
1637                    To avoid a race in receive_state, free p_uuid while
1638                    holding req_lock. I.e. atomic with the state change */
1639                 kfree(mdev->p_uuid);
1640                 mdev->p_uuid = NULL;
1641         }
1642
1643         rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1644         spin_unlock_irq(&mdev->tconn->req_lock);
1645
1646         if (rv < SS_SUCCESS)
1647                 goto force_diskless_dec;
1648
1649         mod_timer(&mdev->request_timer, jiffies + HZ);
1650
1651         if (mdev->state.role == R_PRIMARY)
1652                 mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1653         else
1654                 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1655
1656         drbd_md_mark_dirty(mdev);
1657         drbd_md_sync(mdev);
1658
1659         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1660         put_ldev(mdev);
1661         conn_reconfig_done(mdev->tconn);
1662         drbd_adm_finish(info, retcode);
1663         return 0;
1664
1665  force_diskless_dec:
1666         put_ldev(mdev);
1667  force_diskless:
1668         drbd_force_state(mdev, NS(disk, D_DISKLESS));
1669         drbd_md_sync(mdev);
1670  fail:
1671         conn_reconfig_done(mdev->tconn);
1672         if (nbc) {
1673                 if (nbc->backing_bdev)
1674                         blkdev_put(nbc->backing_bdev,
1675                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1676                 if (nbc->md_bdev)
1677                         blkdev_put(nbc->md_bdev,
1678                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1679                 kfree(nbc);
1680         }
1681         kfree(new_disk_conf);
1682         lc_destroy(resync_lru);
1683         kfree(new_plan);
1684
1685  finish:
1686         drbd_adm_finish(info, retcode);
1687         return 0;
1688 }
1689
1690 static int adm_detach(struct drbd_conf *mdev, int force)
1691 {
1692         enum drbd_state_rv retcode;
1693         int ret;
1694
1695         if (force) {
1696                 set_bit(FORCE_DETACH, &mdev->flags);
1697                 drbd_force_state(mdev, NS(disk, D_FAILED));
1698                 retcode = SS_SUCCESS;
1699                 goto out;
1700         }
1701
1702         drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1703         drbd_md_get_buffer(mdev); /* make sure there is no in-flight meta-data IO */
1704         retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1705         drbd_md_put_buffer(mdev);
1706         /* D_FAILED will transition to DISKLESS. */
1707         ret = wait_event_interruptible(mdev->misc_wait,
1708                         mdev->state.disk != D_FAILED);
1709         drbd_resume_io(mdev);
1710         if ((int)retcode == (int)SS_IS_DISKLESS)
1711                 retcode = SS_NOTHING_TO_DO;
1712         if (ret)
1713                 retcode = ERR_INTR;
1714 out:
1715         return retcode;
1716 }
1717
1718 /* Detaching the disk is a process in multiple stages.  First we need to lock
1719  * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1720  * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1721  * internal references as well.
1722  * Only then we have finally detached. */
1723 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
1724 {
1725         enum drbd_ret_code retcode;
1726         struct detach_parms parms = { };
1727         int err;
1728
1729         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1730         if (!adm_ctx.reply_skb)
1731                 return retcode;
1732         if (retcode != NO_ERROR)
1733                 goto out;
1734
1735         if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
1736                 err = detach_parms_from_attrs(&parms, info);
1737                 if (err) {
1738                         retcode = ERR_MANDATORY_TAG;
1739                         drbd_msg_put_info(from_attrs_err_to_txt(err));
1740                         goto out;
1741                 }
1742         }
1743
1744         retcode = adm_detach(adm_ctx.mdev, parms.force_detach);
1745 out:
1746         drbd_adm_finish(info, retcode);
1747         return 0;
1748 }
1749
1750 static bool conn_resync_running(struct drbd_tconn *tconn)
1751 {
1752         struct drbd_conf *mdev;
1753         bool rv = false;
1754         int vnr;
1755
1756         rcu_read_lock();
1757         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1758                 if (mdev->state.conn == C_SYNC_SOURCE ||
1759                     mdev->state.conn == C_SYNC_TARGET ||
1760                     mdev->state.conn == C_PAUSED_SYNC_S ||
1761                     mdev->state.conn == C_PAUSED_SYNC_T) {
1762                         rv = true;
1763                         break;
1764                 }
1765         }
1766         rcu_read_unlock();
1767
1768         return rv;
1769 }
1770
1771 static bool conn_ov_running(struct drbd_tconn *tconn)
1772 {
1773         struct drbd_conf *mdev;
1774         bool rv = false;
1775         int vnr;
1776
1777         rcu_read_lock();
1778         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1779                 if (mdev->state.conn == C_VERIFY_S ||
1780                     mdev->state.conn == C_VERIFY_T) {
1781                         rv = true;
1782                         break;
1783                 }
1784         }
1785         rcu_read_unlock();
1786
1787         return rv;
1788 }
1789
1790 static enum drbd_ret_code
1791 _check_net_options(struct drbd_tconn *tconn, struct net_conf *old_conf, struct net_conf *new_conf)
1792 {
1793         struct drbd_conf *mdev;
1794         int i;
1795
1796         if (old_conf && tconn->cstate == C_WF_REPORT_PARAMS && tconn->agreed_pro_version < 100) {
1797                 if (new_conf->wire_protocol != old_conf->wire_protocol)
1798                         return ERR_NEED_APV_100;
1799
1800                 if (new_conf->two_primaries != old_conf->two_primaries)
1801                         return ERR_NEED_APV_100;
1802
1803                 if (strcmp(new_conf->integrity_alg, old_conf->integrity_alg))
1804                         return ERR_NEED_APV_100;
1805         }
1806
1807         if (!new_conf->two_primaries &&
1808             conn_highest_role(tconn) == R_PRIMARY &&
1809             conn_highest_peer(tconn) == R_PRIMARY)
1810                 return ERR_NEED_ALLOW_TWO_PRI;
1811
1812         if (new_conf->two_primaries &&
1813             (new_conf->wire_protocol != DRBD_PROT_C))
1814                 return ERR_NOT_PROTO_C;
1815
1816         idr_for_each_entry(&tconn->volumes, mdev, i) {
1817                 if (get_ldev(mdev)) {
1818                         enum drbd_fencing_p fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
1819                         put_ldev(mdev);
1820                         if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
1821                                 return ERR_STONITH_AND_PROT_A;
1822                 }
1823                 if (mdev->state.role == R_PRIMARY && new_conf->discard_my_data)
1824                         return ERR_DISCARD_IMPOSSIBLE;
1825         }
1826
1827         if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A)
1828                 return ERR_CONG_NOT_PROTO_A;
1829
1830         return NO_ERROR;
1831 }
1832
1833 static enum drbd_ret_code
1834 check_net_options(struct drbd_tconn *tconn, struct net_conf *new_conf)
1835 {
1836         static enum drbd_ret_code rv;
1837         struct drbd_conf *mdev;
1838         int i;
1839
1840         rcu_read_lock();
1841         rv = _check_net_options(tconn, rcu_dereference(tconn->net_conf), new_conf);
1842         rcu_read_unlock();
1843
1844         /* tconn->volumes protected by genl_lock() here */
1845         idr_for_each_entry(&tconn->volumes, mdev, i) {
1846                 if (!mdev->bitmap) {
1847                         if(drbd_bm_init(mdev))
1848                                 return ERR_NOMEM;
1849                 }
1850         }
1851
1852         return rv;
1853 }
1854
1855 struct crypto {
1856         struct crypto_hash *verify_tfm;
1857         struct crypto_hash *csums_tfm;
1858         struct crypto_hash *cram_hmac_tfm;
1859         struct crypto_hash *integrity_tfm;
1860 };
1861
1862 static int
1863 alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
1864 {
1865         if (!tfm_name[0])
1866                 return NO_ERROR;
1867
1868         *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
1869         if (IS_ERR(*tfm)) {
1870                 *tfm = NULL;
1871                 return err_alg;
1872         }
1873
1874         return NO_ERROR;
1875 }
1876
1877 static enum drbd_ret_code
1878 alloc_crypto(struct crypto *crypto, struct net_conf *new_conf)
1879 {
1880         char hmac_name[CRYPTO_MAX_ALG_NAME];
1881         enum drbd_ret_code rv;
1882
1883         rv = alloc_hash(&crypto->csums_tfm, new_conf->csums_alg,
1884                        ERR_CSUMS_ALG);
1885         if (rv != NO_ERROR)
1886                 return rv;
1887         rv = alloc_hash(&crypto->verify_tfm, new_conf->verify_alg,
1888                        ERR_VERIFY_ALG);
1889         if (rv != NO_ERROR)
1890                 return rv;
1891         rv = alloc_hash(&crypto->integrity_tfm, new_conf->integrity_alg,
1892                        ERR_INTEGRITY_ALG);
1893         if (rv != NO_ERROR)
1894                 return rv;
1895         if (new_conf->cram_hmac_alg[0] != 0) {
1896                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1897                          new_conf->cram_hmac_alg);
1898
1899                 rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
1900                                ERR_AUTH_ALG);
1901         }
1902
1903         return rv;
1904 }
1905
1906 static void free_crypto(struct crypto *crypto)
1907 {
1908         crypto_free_hash(crypto->cram_hmac_tfm);
1909         crypto_free_hash(crypto->integrity_tfm);
1910         crypto_free_hash(crypto->csums_tfm);
1911         crypto_free_hash(crypto->verify_tfm);
1912 }
1913
1914 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
1915 {
1916         enum drbd_ret_code retcode;
1917         struct drbd_tconn *tconn;
1918         struct net_conf *old_conf, *new_conf = NULL;
1919         int err;
1920         int ovr; /* online verify running */
1921         int rsr; /* re-sync running */
1922         struct crypto crypto = { };
1923
1924         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
1925         if (!adm_ctx.reply_skb)
1926                 return retcode;
1927         if (retcode != NO_ERROR)
1928                 goto out;
1929
1930         tconn = adm_ctx.tconn;
1931
1932         new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1933         if (!new_conf) {
1934                 retcode = ERR_NOMEM;
1935                 goto out;
1936         }
1937
1938         conn_reconfig_start(tconn);
1939
1940         mutex_lock(&tconn->data.mutex);
1941         mutex_lock(&tconn->conf_update);
1942         old_conf = tconn->net_conf;
1943
1944         if (!old_conf) {
1945                 drbd_msg_put_info("net conf missing, try connect");
1946                 retcode = ERR_INVALID_REQUEST;
1947                 goto fail;
1948         }
1949
1950         *new_conf = *old_conf;
1951         if (should_set_defaults(info))
1952                 set_net_conf_defaults(new_conf);
1953
1954         err = net_conf_from_attrs_for_change(new_conf, info);
1955         if (err && err != -ENOMSG) {
1956                 retcode = ERR_MANDATORY_TAG;
1957                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1958                 goto fail;
1959         }
1960
1961         retcode = check_net_options(tconn, new_conf);
1962         if (retcode != NO_ERROR)
1963                 goto fail;
1964
1965         /* re-sync running */
1966         rsr = conn_resync_running(tconn);
1967         if (rsr && strcmp(new_conf->csums_alg, old_conf->csums_alg)) {
1968                 retcode = ERR_CSUMS_RESYNC_RUNNING;
1969                 goto fail;
1970         }
1971
1972         /* online verify running */
1973         ovr = conn_ov_running(tconn);
1974         if (ovr && strcmp(new_conf->verify_alg, old_conf->verify_alg)) {
1975                 retcode = ERR_VERIFY_RUNNING;
1976                 goto fail;
1977         }
1978
1979         retcode = alloc_crypto(&crypto, new_conf);
1980         if (retcode != NO_ERROR)
1981                 goto fail;
1982
1983         rcu_assign_pointer(tconn->net_conf, new_conf);
1984
1985         if (!rsr) {
1986                 crypto_free_hash(tconn->csums_tfm);
1987                 tconn->csums_tfm = crypto.csums_tfm;
1988                 crypto.csums_tfm = NULL;
1989         }
1990         if (!ovr) {
1991                 crypto_free_hash(tconn->verify_tfm);
1992                 tconn->verify_tfm = crypto.verify_tfm;
1993                 crypto.verify_tfm = NULL;
1994         }
1995
1996         crypto_free_hash(tconn->integrity_tfm);
1997         tconn->integrity_tfm = crypto.integrity_tfm;
1998         if (tconn->cstate >= C_WF_REPORT_PARAMS && tconn->agreed_pro_version >= 100)
1999                 /* Do this without trying to take tconn->data.mutex again.  */
2000                 __drbd_send_protocol(tconn, P_PROTOCOL_UPDATE);
2001
2002         crypto_free_hash(tconn->cram_hmac_tfm);
2003         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2004
2005         mutex_unlock(&tconn->conf_update);
2006         mutex_unlock(&tconn->data.mutex);
2007         synchronize_rcu();
2008         kfree(old_conf);
2009
2010         if (tconn->cstate >= C_WF_REPORT_PARAMS)
2011                 drbd_send_sync_param(minor_to_mdev(conn_lowest_minor(tconn)));
2012
2013         goto done;
2014
2015  fail:
2016         mutex_unlock(&tconn->conf_update);
2017         mutex_unlock(&tconn->data.mutex);
2018         free_crypto(&crypto);
2019         kfree(new_conf);
2020  done:
2021         conn_reconfig_done(tconn);
2022  out:
2023         drbd_adm_finish(info, retcode);
2024         return 0;
2025 }
2026
2027 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
2028 {
2029         struct drbd_conf *mdev;
2030         struct net_conf *old_conf, *new_conf = NULL;
2031         struct crypto crypto = { };
2032         struct drbd_tconn *tconn;
2033         enum drbd_ret_code retcode;
2034         int i;
2035         int err;
2036
2037         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2038
2039         if (!adm_ctx.reply_skb)
2040                 return retcode;
2041         if (retcode != NO_ERROR)
2042                 goto out;
2043         if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
2044                 drbd_msg_put_info("connection endpoint(s) missing");
2045                 retcode = ERR_INVALID_REQUEST;
2046                 goto out;
2047         }
2048
2049         /* No need for _rcu here. All reconfiguration is
2050          * strictly serialized on genl_lock(). We are protected against
2051          * concurrent reconfiguration/addition/deletion */
2052         list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
2053                 if (nla_len(adm_ctx.my_addr) == tconn->my_addr_len &&
2054                     !memcmp(nla_data(adm_ctx.my_addr), &tconn->my_addr, tconn->my_addr_len)) {
2055                         retcode = ERR_LOCAL_ADDR;
2056                         goto out;
2057                 }
2058
2059                 if (nla_len(adm_ctx.peer_addr) == tconn->peer_addr_len &&
2060                     !memcmp(nla_data(adm_ctx.peer_addr), &tconn->peer_addr, tconn->peer_addr_len)) {
2061                         retcode = ERR_PEER_ADDR;
2062                         goto out;
2063                 }
2064         }
2065
2066         tconn = adm_ctx.tconn;
2067         conn_reconfig_start(tconn);
2068
2069         if (tconn->cstate > C_STANDALONE) {
2070                 retcode = ERR_NET_CONFIGURED;
2071                 goto fail;
2072         }
2073
2074         /* allocation not in the IO path, drbdsetup / netlink process context */
2075         new_conf = kzalloc(sizeof(*new_conf), GFP_KERNEL);
2076         if (!new_conf) {
2077                 retcode = ERR_NOMEM;
2078                 goto fail;
2079         }
2080
2081         set_net_conf_defaults(new_conf);
2082
2083         err = net_conf_from_attrs(new_conf, info);
2084         if (err && err != -ENOMSG) {
2085                 retcode = ERR_MANDATORY_TAG;
2086                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2087                 goto fail;
2088         }
2089
2090         retcode = check_net_options(tconn, new_conf);
2091         if (retcode != NO_ERROR)
2092                 goto fail;
2093
2094         retcode = alloc_crypto(&crypto, new_conf);
2095         if (retcode != NO_ERROR)
2096                 goto fail;
2097
2098         ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2099
2100         conn_flush_workqueue(tconn);
2101
2102         mutex_lock(&tconn->conf_update);
2103         old_conf = tconn->net_conf;
2104         if (old_conf) {
2105                 retcode = ERR_NET_CONFIGURED;
2106                 mutex_unlock(&tconn->conf_update);
2107                 goto fail;
2108         }
2109         rcu_assign_pointer(tconn->net_conf, new_conf);
2110
2111         conn_free_crypto(tconn);
2112         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2113         tconn->integrity_tfm = crypto.integrity_tfm;
2114         tconn->csums_tfm = crypto.csums_tfm;
2115         tconn->verify_tfm = crypto.verify_tfm;
2116
2117         tconn->my_addr_len = nla_len(adm_ctx.my_addr);
2118         memcpy(&tconn->my_addr, nla_data(adm_ctx.my_addr), tconn->my_addr_len);
2119         tconn->peer_addr_len = nla_len(adm_ctx.peer_addr);
2120         memcpy(&tconn->peer_addr, nla_data(adm_ctx.peer_addr), tconn->peer_addr_len);
2121
2122         mutex_unlock(&tconn->conf_update);
2123
2124         rcu_read_lock();
2125         idr_for_each_entry(&tconn->volumes, mdev, i) {
2126                 mdev->send_cnt = 0;
2127                 mdev->recv_cnt = 0;
2128         }
2129         rcu_read_unlock();
2130
2131         retcode = conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2132
2133         conn_reconfig_done(tconn);
2134         drbd_adm_finish(info, retcode);
2135         return 0;
2136
2137 fail:
2138         free_crypto(&crypto);
2139         kfree(new_conf);
2140
2141         conn_reconfig_done(tconn);
2142 out:
2143         drbd_adm_finish(info, retcode);
2144         return 0;
2145 }
2146
2147 static enum drbd_state_rv conn_try_disconnect(struct drbd_tconn *tconn, bool force)
2148 {
2149         enum drbd_state_rv rv;
2150
2151         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2152                         force ? CS_HARD : 0);
2153
2154         switch (rv) {
2155         case SS_NOTHING_TO_DO:
2156                 break;
2157         case SS_ALREADY_STANDALONE:
2158                 return SS_SUCCESS;
2159         case SS_PRIMARY_NOP:
2160                 /* Our state checking code wants to see the peer outdated. */
2161                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2162                                                 pdsk, D_OUTDATED), CS_VERBOSE);
2163                 break;
2164         case SS_CW_FAILED_BY_PEER:
2165                 /* The peer probably wants to see us outdated. */
2166                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2167                                                         disk, D_OUTDATED), 0);
2168                 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2169                         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2170                                         CS_HARD);
2171                 }
2172                 break;
2173         default:;
2174                 /* no special handling necessary */
2175         }
2176
2177         if (rv >= SS_SUCCESS) {
2178                 enum drbd_state_rv rv2;
2179                 /* No one else can reconfigure the network while I am here.
2180                  * The state handling only uses drbd_thread_stop_nowait(),
2181                  * we want to really wait here until the receiver is no more.
2182                  */
2183                 drbd_thread_stop(&adm_ctx.tconn->receiver);
2184
2185                 /* Race breaker.  This additional state change request may be
2186                  * necessary, if this was a forced disconnect during a receiver
2187                  * restart.  We may have "killed" the receiver thread just
2188                  * after drbdd_init() returned.  Typically, we should be
2189                  * C_STANDALONE already, now, and this becomes a no-op.
2190                  */
2191                 rv2 = conn_request_state(tconn, NS(conn, C_STANDALONE),
2192                                 CS_VERBOSE | CS_HARD);
2193                 if (rv2 < SS_SUCCESS)
2194                         conn_err(tconn,
2195                                 "unexpected rv2=%d in conn_try_disconnect()\n",
2196                                 rv2);
2197         }
2198         return rv;
2199 }
2200
2201 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2202 {
2203         struct disconnect_parms parms;
2204         struct drbd_tconn *tconn;
2205         enum drbd_state_rv rv;
2206         enum drbd_ret_code retcode;
2207         int err;
2208
2209         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
2210         if (!adm_ctx.reply_skb)
2211                 return retcode;
2212         if (retcode != NO_ERROR)
2213                 goto fail;
2214
2215         tconn = adm_ctx.tconn;
2216         memset(&parms, 0, sizeof(parms));
2217         if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2218                 err = disconnect_parms_from_attrs(&parms, info);
2219                 if (err) {
2220                         retcode = ERR_MANDATORY_TAG;
2221                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2222                         goto fail;
2223                 }
2224         }
2225
2226         rv = conn_try_disconnect(tconn, parms.force_disconnect);
2227         if (rv < SS_SUCCESS)
2228                 retcode = rv;  /* FIXME: Type mismatch. */
2229         else
2230                 retcode = NO_ERROR;
2231  fail:
2232         drbd_adm_finish(info, retcode);
2233         return 0;
2234 }
2235
2236 void resync_after_online_grow(struct drbd_conf *mdev)
2237 {
2238         int iass; /* I am sync source */
2239
2240         dev_info(DEV, "Resync of new storage after online grow\n");
2241         if (mdev->state.role != mdev->state.peer)
2242                 iass = (mdev->state.role == R_PRIMARY);
2243         else
2244                 iass = test_bit(RESOLVE_CONFLICTS, &mdev->tconn->flags);
2245
2246         if (iass)
2247                 drbd_start_resync(mdev, C_SYNC_SOURCE);
2248         else
2249                 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2250 }
2251
2252 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2253 {
2254         struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
2255         struct resize_parms rs;
2256         struct drbd_conf *mdev;
2257         enum drbd_ret_code retcode;
2258         enum determine_dev_size dd;
2259         enum dds_flags ddsf;
2260         sector_t u_size;
2261         int err;
2262
2263         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2264         if (!adm_ctx.reply_skb)
2265                 return retcode;
2266         if (retcode != NO_ERROR)
2267                 goto fail;
2268
2269         memset(&rs, 0, sizeof(struct resize_parms));
2270         if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2271                 err = resize_parms_from_attrs(&rs, info);
2272                 if (err) {
2273                         retcode = ERR_MANDATORY_TAG;
2274                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2275                         goto fail;
2276                 }
2277         }
2278
2279         mdev = adm_ctx.mdev;
2280         if (mdev->state.conn > C_CONNECTED) {
2281                 retcode = ERR_RESIZE_RESYNC;
2282                 goto fail;
2283         }
2284
2285         if (mdev->state.role == R_SECONDARY &&
2286             mdev->state.peer == R_SECONDARY) {
2287                 retcode = ERR_NO_PRIMARY;
2288                 goto fail;
2289         }
2290
2291         if (!get_ldev(mdev)) {
2292                 retcode = ERR_NO_DISK;
2293                 goto fail;
2294         }
2295
2296         if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
2297                 retcode = ERR_NEED_APV_93;
2298                 goto fail_ldev;
2299         }
2300
2301         rcu_read_lock();
2302         u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
2303         rcu_read_unlock();
2304         if (u_size != (sector_t)rs.resize_size) {
2305                 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2306                 if (!new_disk_conf) {
2307                         retcode = ERR_NOMEM;
2308                         goto fail_ldev;
2309                 }
2310         }
2311
2312         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
2313                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
2314
2315         if (new_disk_conf) {
2316                 mutex_lock(&mdev->tconn->conf_update);
2317                 old_disk_conf = mdev->ldev->disk_conf;
2318                 *new_disk_conf = *old_disk_conf;
2319                 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2320                 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
2321                 mutex_unlock(&mdev->tconn->conf_update);
2322                 synchronize_rcu();
2323                 kfree(old_disk_conf);
2324         }
2325
2326         ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2327         dd = drbd_determine_dev_size(mdev, ddsf);
2328         drbd_md_sync(mdev);
2329         put_ldev(mdev);
2330         if (dd == dev_size_error) {
2331                 retcode = ERR_NOMEM_BITMAP;
2332                 goto fail;
2333         }
2334
2335         if (mdev->state.conn == C_CONNECTED) {
2336                 if (dd == grew)
2337                         set_bit(RESIZE_PENDING, &mdev->flags);
2338
2339                 drbd_send_uuids(mdev);
2340                 drbd_send_sizes(mdev, 1, ddsf);
2341         }
2342
2343  fail:
2344         drbd_adm_finish(info, retcode);
2345         return 0;
2346
2347  fail_ldev:
2348         put_ldev(mdev);
2349         goto fail;
2350 }
2351
2352 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2353 {
2354         enum drbd_ret_code retcode;
2355         struct drbd_tconn *tconn;
2356         struct res_opts res_opts;
2357         int err;
2358
2359         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2360         if (!adm_ctx.reply_skb)
2361                 return retcode;
2362         if (retcode != NO_ERROR)
2363                 goto fail;
2364         tconn = adm_ctx.tconn;
2365
2366         res_opts = tconn->res_opts;
2367         if (should_set_defaults(info))
2368                 set_res_opts_defaults(&res_opts);
2369
2370         err = res_opts_from_attrs(&res_opts, info);
2371         if (err && err != -ENOMSG) {
2372                 retcode = ERR_MANDATORY_TAG;
2373                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2374                 goto fail;
2375         }
2376
2377         err = set_resource_options(tconn, &res_opts);
2378         if (err) {
2379                 retcode = ERR_INVALID_REQUEST;
2380                 if (err == -ENOMEM)
2381                         retcode = ERR_NOMEM;
2382         }
2383
2384 fail:
2385         drbd_adm_finish(info, retcode);
2386         return 0;
2387 }
2388
2389 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2390 {
2391         struct drbd_conf *mdev;
2392         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2393
2394         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2395         if (!adm_ctx.reply_skb)
2396                 return retcode;
2397         if (retcode != NO_ERROR)
2398                 goto out;
2399
2400         mdev = adm_ctx.mdev;
2401
2402         /* If there is still bitmap IO pending, probably because of a previous
2403          * resync just being finished, wait for it before requesting a new resync.
2404          * Also wait for it's after_state_ch(). */
2405         drbd_suspend_io(mdev);
2406         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2407         drbd_flush_workqueue(mdev);
2408
2409         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
2410
2411         if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
2412                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2413
2414         while (retcode == SS_NEED_CONNECTION) {
2415                 spin_lock_irq(&mdev->tconn->req_lock);
2416                 if (mdev->state.conn < C_CONNECTED)
2417                         retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
2418                 spin_unlock_irq(&mdev->tconn->req_lock);
2419
2420                 if (retcode != SS_NEED_CONNECTION)
2421                         break;
2422
2423                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2424         }
2425         drbd_resume_io(mdev);
2426
2427 out:
2428         drbd_adm_finish(info, retcode);
2429         return 0;
2430 }
2431
2432 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2433                 union drbd_state mask, union drbd_state val)
2434 {
2435         enum drbd_ret_code retcode;
2436
2437         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2438         if (!adm_ctx.reply_skb)
2439                 return retcode;
2440         if (retcode != NO_ERROR)
2441                 goto out;
2442
2443         retcode = drbd_request_state(adm_ctx.mdev, mask, val);
2444 out:
2445         drbd_adm_finish(info, retcode);
2446         return 0;
2447 }
2448
2449 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
2450 {
2451         int rv;
2452
2453         rv = drbd_bmio_set_n_write(mdev);
2454         drbd_suspend_al(mdev);
2455         return rv;
2456 }
2457
2458 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
2459 {
2460         int retcode; /* drbd_ret_code, drbd_state_rv */
2461         struct drbd_conf *mdev;
2462
2463         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2464         if (!adm_ctx.reply_skb)
2465                 return retcode;
2466         if (retcode != NO_ERROR)
2467                 goto out;
2468
2469         mdev = adm_ctx.mdev;
2470
2471         /* If there is still bitmap IO pending, probably because of a previous
2472          * resync just being finished, wait for it before requesting a new resync.
2473          * Also wait for it's after_state_ch(). */
2474         drbd_suspend_io(mdev);
2475         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2476         drbd_flush_workqueue(mdev);
2477
2478         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
2479         if (retcode < SS_SUCCESS) {
2480                 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
2481                         /* The peer will get a resync upon connect anyways.
2482                          * Just make that into a full resync. */
2483                         retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
2484                         if (retcode >= SS_SUCCESS) {
2485                                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
2486                                                    "set_n_write from invalidate_peer",
2487                                                    BM_LOCKED_SET_ALLOWED))
2488                                         retcode = ERR_IO_MD_DISK;
2489                         }
2490                 } else
2491                         retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
2492         }
2493         drbd_resume_io(mdev);
2494
2495 out:
2496         drbd_adm_finish(info, retcode);
2497         return 0;
2498 }
2499
2500 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2501 {
2502         enum drbd_ret_code retcode;
2503
2504         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2505         if (!adm_ctx.reply_skb)
2506                 return retcode;
2507         if (retcode != NO_ERROR)
2508                 goto out;
2509
2510         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2511                 retcode = ERR_PAUSE_IS_SET;
2512 out:
2513         drbd_adm_finish(info, retcode);
2514         return 0;
2515 }
2516
2517 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
2518 {
2519         union drbd_dev_state s;
2520         enum drbd_ret_code retcode;
2521
2522         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2523         if (!adm_ctx.reply_skb)
2524                 return retcode;
2525         if (retcode != NO_ERROR)
2526                 goto out;
2527
2528         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2529                 s = adm_ctx.mdev->state;
2530                 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2531                         retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2532                                   s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2533                 } else {
2534                         retcode = ERR_PAUSE_IS_CLEAR;
2535                 }
2536         }
2537
2538 out:
2539         drbd_adm_finish(info, retcode);
2540         return 0;
2541 }
2542
2543 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
2544 {
2545         return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
2546 }
2547
2548 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
2549 {
2550         struct drbd_conf *mdev;
2551         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2552
2553         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2554         if (!adm_ctx.reply_skb)
2555                 return retcode;
2556         if (retcode != NO_ERROR)
2557                 goto out;
2558
2559         mdev = adm_ctx.mdev;
2560         if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2561                 drbd_uuid_new_current(mdev);
2562                 clear_bit(NEW_CUR_UUID, &mdev->flags);
2563         }
2564         drbd_suspend_io(mdev);
2565         retcode = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2566         if (retcode == SS_SUCCESS) {
2567                 if (mdev->state.conn < C_CONNECTED)
2568                         tl_clear(mdev->tconn);
2569                 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2570                         tl_restart(mdev->tconn, FAIL_FROZEN_DISK_IO);
2571         }
2572         drbd_resume_io(mdev);
2573
2574 out:
2575         drbd_adm_finish(info, retcode);
2576         return 0;
2577 }
2578
2579 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
2580 {
2581         return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
2582 }
2583
2584 int nla_put_drbd_cfg_context(struct sk_buff *skb, struct drbd_tconn *tconn, unsigned vnr)
2585 {
2586         struct nlattr *nla;
2587         nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2588         if (!nla)
2589                 goto nla_put_failure;
2590         if (vnr != VOLUME_UNSPECIFIED &&
2591             nla_put_u32(skb, T_ctx_volume, vnr))
2592                 goto nla_put_failure;
2593         if (nla_put_string(skb, T_ctx_resource_name, tconn->name))
2594                 goto nla_put_failure;
2595         if (tconn->my_addr_len &&
2596             nla_put(skb, T_ctx_my_addr, tconn->my_addr_len, &tconn->my_addr))
2597                 goto nla_put_failure;
2598         if (tconn->peer_addr_len &&
2599             nla_put(skb, T_ctx_peer_addr, tconn->peer_addr_len, &tconn->peer_addr))
2600                 goto nla_put_failure;
2601         nla_nest_end(skb, nla);
2602         return 0;
2603
2604 nla_put_failure:
2605         if (nla)
2606                 nla_nest_cancel(skb, nla);
2607         return -EMSGSIZE;
2608 }
2609
2610 int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
2611                 const struct sib_info *sib)
2612 {
2613         struct state_info *si = NULL; /* for sizeof(si->member); */
2614         struct net_conf *nc;
2615         struct nlattr *nla;
2616         int got_ldev;
2617         int err = 0;
2618         int exclude_sensitive;
2619
2620         /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2621          * to.  So we better exclude_sensitive information.
2622          *
2623          * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2624          * in the context of the requesting user process. Exclude sensitive
2625          * information, unless current has superuser.
2626          *
2627          * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2628          * relies on the current implementation of netlink_dump(), which
2629          * executes the dump callback successively from netlink_recvmsg(),
2630          * always in the context of the receiving process */
2631         exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2632
2633         got_ldev = get_ldev(mdev);
2634
2635         /* We need to add connection name and volume number information still.
2636          * Minor number is in drbd_genlmsghdr. */
2637         if (nla_put_drbd_cfg_context(skb, mdev->tconn, mdev->vnr))
2638                 goto nla_put_failure;
2639
2640         if (res_opts_to_skb(skb, &mdev->tconn->res_opts, exclude_sensitive))
2641                 goto nla_put_failure;
2642
2643         rcu_read_lock();
2644         if (got_ldev)
2645                 if (disk_conf_to_skb(skb, rcu_dereference(mdev->ldev->disk_conf), exclude_sensitive))
2646                         goto nla_put_failure;
2647
2648         nc = rcu_dereference(mdev->tconn->net_conf);
2649         if (nc)
2650                 err = net_conf_to_skb(skb, nc, exclude_sensitive);
2651         rcu_read_unlock();
2652         if (err)
2653                 goto nla_put_failure;
2654
2655         nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2656         if (!nla)
2657                 goto nla_put_failure;
2658         if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
2659             nla_put_u32(skb, T_current_state, mdev->state.i) ||
2660             nla_put_u64(skb, T_ed_uuid, mdev->ed_uuid) ||
2661             nla_put_u64(skb, T_capacity, drbd_get_capacity(mdev->this_bdev)) ||
2662             nla_put_u64(skb, T_send_cnt, mdev->send_cnt) ||
2663             nla_put_u64(skb, T_recv_cnt, mdev->recv_cnt) ||
2664             nla_put_u64(skb, T_read_cnt, mdev->read_cnt) ||
2665             nla_put_u64(skb, T_writ_cnt, mdev->writ_cnt) ||
2666             nla_put_u64(skb, T_al_writ_cnt, mdev->al_writ_cnt) ||
2667             nla_put_u64(skb, T_bm_writ_cnt, mdev->bm_writ_cnt) ||
2668             nla_put_u32(skb, T_ap_bio_cnt, atomic_read(&mdev->ap_bio_cnt)) ||
2669             nla_put_u32(skb, T_ap_pending_cnt, atomic_read(&mdev->ap_pending_cnt)) ||
2670             nla_put_u32(skb, T_rs_pending_cnt, atomic_read(&mdev->rs_pending_cnt)))
2671                 goto nla_put_failure;
2672
2673         if (got_ldev) {
2674                 int err;
2675
2676                 spin_lock_irq(&mdev->ldev->md.uuid_lock);
2677                 err = nla_put(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid);
2678                 spin_unlock_irq(&mdev->ldev->md.uuid_lock);
2679
2680                 if (err)
2681                         goto nla_put_failure;
2682
2683                 if (nla_put_u32(skb, T_disk_flags, mdev->ldev->md.flags) ||
2684                     nla_put_u64(skb, T_bits_total, drbd_bm_bits(mdev)) ||
2685                     nla_put_u64(skb, T_bits_oos, drbd_bm_total_weight(mdev)))
2686                         goto nla_put_failure;
2687                 if (C_SYNC_SOURCE <= mdev->state.conn &&
2688                     C_PAUSED_SYNC_T >= mdev->state.conn) {
2689                         if (nla_put_u64(skb, T_bits_rs_total, mdev->rs_total) ||
2690                             nla_put_u64(skb, T_bits_rs_failed, mdev->rs_failed))
2691                                 goto nla_put_failure;
2692                 }
2693         }
2694
2695         if (sib) {
2696                 switch(sib->sib_reason) {
2697                 case SIB_SYNC_PROGRESS:
2698                 case SIB_GET_STATUS_REPLY:
2699                         break;
2700                 case SIB_STATE_CHANGE:
2701                         if (nla_put_u32(skb, T_prev_state, sib->os.i) ||
2702                             nla_put_u32(skb, T_new_state, sib->ns.i))
2703                                 goto nla_put_failure;
2704                         break;
2705                 case SIB_HELPER_POST:
2706                         if (nla_put_u32(skb, T_helper_exit_code,
2707                                         sib->helper_exit_code))
2708                                 goto nla_put_failure;
2709                         /* fall through */
2710                 case SIB_HELPER_PRE:
2711                         if (nla_put_string(skb, T_helper, sib->helper_name))
2712                                 goto nla_put_failure;
2713                         break;
2714                 }
2715         }
2716         nla_nest_end(skb, nla);
2717
2718         if (0)
2719 nla_put_failure:
2720                 err = -EMSGSIZE;
2721         if (got_ldev)
2722                 put_ldev(mdev);
2723         return err;
2724 }
2725
2726 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
2727 {
2728         enum drbd_ret_code retcode;
2729         int err;
2730
2731         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2732         if (!adm_ctx.reply_skb)
2733                 return retcode;
2734         if (retcode != NO_ERROR)
2735                 goto out;
2736
2737         err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.mdev, NULL);
2738         if (err) {
2739                 nlmsg_free(adm_ctx.reply_skb);
2740                 return err;
2741         }
2742 out:
2743         drbd_adm_finish(info, retcode);
2744         return 0;
2745 }
2746
2747 int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
2748 {
2749         struct drbd_conf *mdev;
2750         struct drbd_genlmsghdr *dh;
2751         struct drbd_tconn *pos = (struct drbd_tconn*)cb->args[0];
2752         struct drbd_tconn *tconn = NULL;
2753         struct drbd_tconn *tmp;
2754         unsigned volume = cb->args[1];
2755
2756         /* Open coded, deferred, iteration:
2757          * list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
2758          *      idr_for_each_entry(&tconn->volumes, mdev, i) {
2759          *        ...
2760          *      }
2761          * }
2762          * where tconn is cb->args[0];
2763          * and i is cb->args[1];
2764          *
2765          * cb->args[2] indicates if we shall loop over all resources,
2766          * or just dump all volumes of a single resource.
2767          *
2768          * This may miss entries inserted after this dump started,
2769          * or entries deleted before they are reached.
2770          *
2771          * We need to make sure the mdev won't disappear while
2772          * we are looking at it, and revalidate our iterators
2773          * on each iteration.
2774          */
2775
2776         /* synchronize with conn_create()/conn_destroy() */
2777         rcu_read_lock();
2778         /* revalidate iterator position */
2779         list_for_each_entry_rcu(tmp, &drbd_tconns, all_tconn) {
2780                 if (pos == NULL) {
2781                         /* first iteration */
2782                         pos = tmp;
2783                         tconn = pos;
2784                         break;
2785                 }
2786                 if (tmp == pos) {
2787                         tconn = pos;
2788                         break;
2789                 }
2790         }
2791         if (tconn) {
2792 next_tconn:
2793                 mdev = idr_get_next(&tconn->volumes, &volume);
2794                 if (!mdev) {
2795                         /* No more volumes to dump on this tconn.
2796                          * Advance tconn iterator. */
2797                         pos = list_entry_rcu(tconn->all_tconn.next,
2798                                              struct drbd_tconn, all_tconn);
2799                         /* Did we dump any volume on this tconn yet? */
2800                         if (volume != 0) {
2801                                 /* If we reached the end of the list,
2802                                  * or only a single resource dump was requested,
2803                                  * we are done. */
2804                                 if (&pos->all_tconn == &drbd_tconns || cb->args[2])
2805                                         goto out;
2806                                 volume = 0;
2807                                 tconn = pos;
2808                                 goto next_tconn;
2809                         }
2810                 }
2811
2812                 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
2813                                 cb->nlh->nlmsg_seq, &drbd_genl_family,
2814                                 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
2815                 if (!dh)
2816                         goto out;
2817
2818                 if (!mdev) {
2819                         /* This is a tconn without a single volume.
2820                          * Suprisingly enough, it may have a network
2821                          * configuration. */
2822                         struct net_conf *nc;
2823                         dh->minor = -1U;
2824                         dh->ret_code = NO_ERROR;
2825                         if (nla_put_drbd_cfg_context(skb, tconn, VOLUME_UNSPECIFIED))
2826                                 goto cancel;
2827                         nc = rcu_dereference(tconn->net_conf);
2828                         if (nc && net_conf_to_skb(skb, nc, 1) != 0)
2829                                 goto cancel;
2830                         goto done;
2831                 }
2832
2833                 D_ASSERT(mdev->vnr == volume);
2834                 D_ASSERT(mdev->tconn == tconn);
2835
2836                 dh->minor = mdev_to_minor(mdev);
2837                 dh->ret_code = NO_ERROR;
2838
2839                 if (nla_put_status_info(skb, mdev, NULL)) {
2840 cancel:
2841                         genlmsg_cancel(skb, dh);
2842                         goto out;
2843                 }
2844 done:
2845                 genlmsg_end(skb, dh);
2846         }
2847
2848 out:
2849         rcu_read_unlock();
2850         /* where to start the next iteration */
2851         cb->args[0] = (long)pos;
2852         cb->args[1] = (pos == tconn) ? volume + 1 : 0;
2853
2854         /* No more tconns/volumes/minors found results in an empty skb.
2855          * Which will terminate the dump. */
2856         return skb->len;
2857 }
2858
2859 /*
2860  * Request status of all resources, or of all volumes within a single resource.
2861  *
2862  * This is a dump, as the answer may not fit in a single reply skb otherwise.
2863  * Which means we cannot use the family->attrbuf or other such members, because
2864  * dump is NOT protected by the genl_lock().  During dump, we only have access
2865  * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
2866  *
2867  * Once things are setup properly, we call into get_one_status().
2868  */
2869 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
2870 {
2871         const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
2872         struct nlattr *nla;
2873         const char *resource_name;
2874         struct drbd_tconn *tconn;
2875         int maxtype;
2876
2877         /* Is this a followup call? */
2878         if (cb->args[0]) {
2879                 /* ... of a single resource dump,
2880                  * and the resource iterator has been advanced already? */
2881                 if (cb->args[2] && cb->args[2] != cb->args[0])
2882                         return 0; /* DONE. */
2883                 goto dump;
2884         }
2885
2886         /* First call (from netlink_dump_start).  We need to figure out
2887          * which resource(s) the user wants us to dump. */
2888         nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
2889                         nlmsg_attrlen(cb->nlh, hdrlen),
2890                         DRBD_NLA_CFG_CONTEXT);
2891
2892         /* No explicit context given.  Dump all. */
2893         if (!nla)
2894                 goto dump;
2895         maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
2896         nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
2897         if (IS_ERR(nla))
2898                 return PTR_ERR(nla);
2899         /* context given, but no name present? */
2900         if (!nla)
2901                 return -EINVAL;
2902         resource_name = nla_data(nla);
2903         tconn = conn_get_by_name(resource_name);
2904
2905         if (!tconn)
2906                 return -ENODEV;
2907
2908         kref_put(&tconn->kref, &conn_destroy); /* get_one_status() (re)validates tconn by itself */
2909
2910         /* prime iterators, and set "filter" mode mark:
2911          * only dump this tconn. */
2912         cb->args[0] = (long)tconn;
2913         /* cb->args[1] = 0; passed in this way. */
2914         cb->args[2] = (long)tconn;
2915
2916 dump:
2917         return get_one_status(skb, cb);
2918 }
2919
2920 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
2921 {
2922         enum drbd_ret_code retcode;
2923         struct timeout_parms tp;
2924         int err;
2925
2926         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2927         if (!adm_ctx.reply_skb)
2928                 return retcode;
2929         if (retcode != NO_ERROR)
2930                 goto out;
2931
2932         tp.timeout_type =
2933                 adm_ctx.mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2934                 test_bit(USE_DEGR_WFC_T, &adm_ctx.mdev->flags) ? UT_DEGRADED :
2935                 UT_DEFAULT;
2936
2937         err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
2938         if (err) {
2939                 nlmsg_free(adm_ctx.reply_skb);
2940                 return err;
2941         }
2942 out:
2943         drbd_adm_finish(info, retcode);
2944         return 0;
2945 }
2946
2947 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
2948 {
2949         struct drbd_conf *mdev;
2950         enum drbd_ret_code retcode;
2951         struct start_ov_parms parms;
2952
2953         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2954         if (!adm_ctx.reply_skb)
2955                 return retcode;
2956         if (retcode != NO_ERROR)
2957                 goto out;
2958
2959         mdev = adm_ctx.mdev;
2960
2961         /* resume from last known position, if possible */
2962         parms.ov_start_sector = mdev->ov_start_sector;
2963         parms.ov_stop_sector = ULLONG_MAX;
2964         if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
2965                 int err = start_ov_parms_from_attrs(&parms, info);
2966                 if (err) {
2967                         retcode = ERR_MANDATORY_TAG;
2968                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2969                         goto out;
2970                 }
2971         }
2972         /* w_make_ov_request expects position to be aligned */
2973         mdev->ov_start_sector = parms.ov_start_sector & ~(BM_SECT_PER_BIT-1);
2974         mdev->ov_stop_sector = parms.ov_stop_sector;
2975
2976         /* If there is still bitmap IO pending, e.g. previous resync or verify
2977          * just being finished, wait for it before requesting a new resync. */
2978         drbd_suspend_io(mdev);
2979         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2980         retcode = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2981         drbd_resume_io(mdev);
2982 out:
2983         drbd_adm_finish(info, retcode);
2984         return 0;
2985 }
2986
2987
2988 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
2989 {
2990         struct drbd_conf *mdev;
2991         enum drbd_ret_code retcode;
2992         int skip_initial_sync = 0;
2993         int err;
2994         struct new_c_uuid_parms args;
2995
2996         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2997         if (!adm_ctx.reply_skb)
2998                 return retcode;
2999         if (retcode != NO_ERROR)
3000                 goto out_nolock;
3001
3002         mdev = adm_ctx.mdev;
3003         memset(&args, 0, sizeof(args));
3004         if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
3005                 err = new_c_uuid_parms_from_attrs(&args, info);
3006                 if (err) {
3007                         retcode = ERR_MANDATORY_TAG;
3008                         drbd_msg_put_info(from_attrs_err_to_txt(err));
3009                         goto out_nolock;
3010                 }
3011         }
3012
3013         mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
3014
3015         if (!get_ldev(mdev)) {
3016                 retcode = ERR_NO_DISK;
3017                 goto out;
3018         }
3019
3020         /* this is "skip initial sync", assume to be clean */
3021         if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
3022             mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
3023                 dev_info(DEV, "Preparing to skip initial sync\n");
3024                 skip_initial_sync = 1;
3025         } else if (mdev->state.conn != C_STANDALONE) {
3026                 retcode = ERR_CONNECTED;
3027                 goto out_dec;
3028         }
3029
3030         drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
3031         drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
3032
3033         if (args.clear_bm) {
3034                 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
3035                         "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
3036                 if (err) {
3037                         dev_err(DEV, "Writing bitmap failed with %d\n",err);
3038                         retcode = ERR_IO_MD_DISK;
3039                 }
3040                 if (skip_initial_sync) {
3041                         drbd_send_uuids_skip_initial_sync(mdev);
3042                         _drbd_uuid_set(mdev, UI_BITMAP, 0);
3043                         drbd_print_uuids(mdev, "cleared bitmap UUID");
3044                         spin_lock_irq(&mdev->tconn->req_lock);
3045                         _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3046                                         CS_VERBOSE, NULL);
3047                         spin_unlock_irq(&mdev->tconn->req_lock);
3048                 }
3049         }
3050
3051         drbd_md_sync(mdev);
3052 out_dec:
3053         put_ldev(mdev);
3054 out:
3055         mutex_unlock(mdev->state_mutex);
3056 out_nolock:
3057         drbd_adm_finish(info, retcode);
3058         return 0;
3059 }
3060
3061 static enum drbd_ret_code
3062 drbd_check_resource_name(const char *name)
3063 {
3064         if (!name || !name[0]) {
3065                 drbd_msg_put_info("resource name missing");
3066                 return ERR_MANDATORY_TAG;
3067         }
3068         /* if we want to use these in sysfs/configfs/debugfs some day,
3069          * we must not allow slashes */
3070         if (strchr(name, '/')) {
3071                 drbd_msg_put_info("invalid resource name");
3072                 return ERR_INVALID_REQUEST;
3073         }
3074         return NO_ERROR;
3075 }
3076
3077 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
3078 {
3079         enum drbd_ret_code retcode;
3080         struct res_opts res_opts;
3081         int err;
3082
3083         retcode = drbd_adm_prepare(skb, info, 0);
3084         if (!adm_ctx.reply_skb)
3085                 return retcode;
3086         if (retcode != NO_ERROR)
3087                 goto out;
3088
3089         set_res_opts_defaults(&res_opts);
3090         err = res_opts_from_attrs(&res_opts, info);
3091         if (err && err != -ENOMSG) {
3092                 retcode = ERR_MANDATORY_TAG;
3093                 drbd_msg_put_info(from_attrs_err_to_txt(err));
3094                 goto out;
3095         }
3096
3097         retcode = drbd_check_resource_name(adm_ctx.resource_name);
3098         if (retcode != NO_ERROR)
3099                 goto out;
3100
3101         if (adm_ctx.tconn) {
3102                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
3103                         retcode = ERR_INVALID_REQUEST;
3104                         drbd_msg_put_info("resource exists");
3105                 }
3106                 /* else: still NO_ERROR */
3107                 goto out;
3108         }
3109
3110         if (!conn_create(adm_ctx.resource_name, &res_opts))
3111                 retcode = ERR_NOMEM;
3112 out:
3113         drbd_adm_finish(info, retcode);
3114         return 0;
3115 }
3116
3117 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info)
3118 {
3119         struct drbd_genlmsghdr *dh = info->userhdr;
3120         enum drbd_ret_code retcode;
3121
3122         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3123         if (!adm_ctx.reply_skb)
3124                 return retcode;
3125         if (retcode != NO_ERROR)
3126                 goto out;
3127
3128         if (dh->minor > MINORMASK) {
3129                 drbd_msg_put_info("requested minor out of range");
3130                 retcode = ERR_INVALID_REQUEST;
3131                 goto out;
3132         }
3133         if (adm_ctx.volume > DRBD_VOLUME_MAX) {
3134                 drbd_msg_put_info("requested volume id out of range");
3135                 retcode = ERR_INVALID_REQUEST;
3136                 goto out;
3137         }
3138
3139         /* drbd_adm_prepare made sure already
3140          * that mdev->tconn and mdev->vnr match the request. */
3141         if (adm_ctx.mdev) {
3142                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3143                         retcode = ERR_MINOR_EXISTS;
3144                 /* else: still NO_ERROR */
3145                 goto out;
3146         }
3147
3148         retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume);
3149 out:
3150         drbd_adm_finish(info, retcode);
3151         return 0;
3152 }
3153
3154 static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
3155 {
3156         if (mdev->state.disk == D_DISKLESS &&
3157             /* no need to be mdev->state.conn == C_STANDALONE &&
3158              * we may want to delete a minor from a live replication group.
3159              */
3160             mdev->state.role == R_SECONDARY) {
3161                 _drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS),
3162                                     CS_VERBOSE + CS_WAIT_COMPLETE);
3163                 idr_remove(&mdev->tconn->volumes, mdev->vnr);
3164                 idr_remove(&minors, mdev_to_minor(mdev));
3165                 del_gendisk(mdev->vdisk);
3166                 synchronize_rcu();
3167                 kref_put(&mdev->kref, &drbd_minor_destroy);
3168                 return NO_ERROR;
3169         } else
3170                 return ERR_MINOR_CONFIGURED;
3171 }
3172
3173 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info)
3174 {
3175         enum drbd_ret_code retcode;
3176
3177         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3178         if (!adm_ctx.reply_skb)
3179                 return retcode;
3180         if (retcode != NO_ERROR)
3181                 goto out;
3182
3183         retcode = adm_delete_minor(adm_ctx.mdev);
3184 out:
3185         drbd_adm_finish(info, retcode);
3186         return 0;
3187 }
3188
3189 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3190 {
3191         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
3192         struct drbd_conf *mdev;
3193         unsigned i;
3194
3195         retcode = drbd_adm_prepare(skb, info, 0);
3196         if (!adm_ctx.reply_skb)
3197                 return retcode;
3198         if (retcode != NO_ERROR)
3199                 goto out;
3200
3201         if (!adm_ctx.tconn) {
3202                 retcode = ERR_RES_NOT_KNOWN;
3203                 goto out;
3204         }
3205
3206         /* demote */
3207         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3208                 retcode = drbd_set_role(mdev, R_SECONDARY, 0);
3209                 if (retcode < SS_SUCCESS) {
3210                         drbd_msg_put_info("failed to demote");
3211                         goto out;
3212                 }
3213         }
3214
3215         retcode = conn_try_disconnect(adm_ctx.tconn, 0);
3216         if (retcode < SS_SUCCESS) {
3217                 drbd_msg_put_info("failed to disconnect");
3218                 goto out;
3219         }
3220
3221         /* detach */
3222         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3223                 retcode = adm_detach(mdev, 0);
3224                 if (retcode < SS_SUCCESS || retcode > NO_ERROR) {
3225                         drbd_msg_put_info("failed to detach");
3226                         goto out;
3227                 }
3228         }
3229
3230         /* If we reach this, all volumes (of this tconn) are Secondary,
3231          * Disconnected, Diskless, aka Unconfigured. Make sure all threads have
3232          * actually stopped, state handling only does drbd_thread_stop_nowait(). */
3233         drbd_thread_stop(&adm_ctx.tconn->worker);
3234
3235         /* Now, nothing can fail anymore */
3236
3237         /* delete volumes */
3238         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3239                 retcode = adm_delete_minor(mdev);
3240                 if (retcode != NO_ERROR) {
3241                         /* "can not happen" */
3242                         drbd_msg_put_info("failed to delete volume");
3243                         goto out;
3244                 }
3245         }
3246
3247         /* delete connection */
3248         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3249                 list_del_rcu(&adm_ctx.tconn->all_tconn);
3250                 synchronize_rcu();
3251                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3252
3253                 retcode = NO_ERROR;
3254         } else {
3255                 /* "can not happen" */
3256                 retcode = ERR_RES_IN_USE;
3257                 drbd_msg_put_info("failed to delete connection");
3258         }
3259         goto out;
3260 out:
3261         drbd_adm_finish(info, retcode);
3262         return 0;
3263 }
3264
3265 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
3266 {
3267         enum drbd_ret_code retcode;
3268
3269         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3270         if (!adm_ctx.reply_skb)
3271                 return retcode;
3272         if (retcode != NO_ERROR)
3273                 goto out;
3274
3275         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3276                 list_del_rcu(&adm_ctx.tconn->all_tconn);
3277                 synchronize_rcu();
3278                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3279
3280                 retcode = NO_ERROR;
3281         } else {
3282                 retcode = ERR_RES_IN_USE;
3283         }
3284
3285         if (retcode == NO_ERROR)
3286                 drbd_thread_stop(&adm_ctx.tconn->worker);
3287 out:
3288         drbd_adm_finish(info, retcode);
3289         return 0;
3290 }
3291
3292 void drbd_bcast_event(struct drbd_conf *mdev, const struct sib_info *sib)
3293 {
3294         static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3295         struct sk_buff *msg;
3296         struct drbd_genlmsghdr *d_out;
3297         unsigned seq;
3298         int err = -ENOMEM;
3299
3300         if (sib->sib_reason == SIB_SYNC_PROGRESS) {
3301                 if (time_after(jiffies, mdev->rs_last_bcast + HZ))
3302                         mdev->rs_last_bcast = jiffies;
3303                 else
3304                         return;
3305         }
3306
3307         seq = atomic_inc_return(&drbd_genl_seq);
3308         msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3309         if (!msg)
3310                 goto failed;
3311
3312         err = -EMSGSIZE;
3313         d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3314         if (!d_out) /* cannot happen, but anyways. */
3315                 goto nla_put_failure;
3316         d_out->minor = mdev_to_minor(mdev);
3317         d_out->ret_code = NO_ERROR;
3318
3319         if (nla_put_status_info(msg, mdev, sib))
3320                 goto nla_put_failure;
3321         genlmsg_end(msg, d_out);
3322         err = drbd_genl_multicast_events(msg, 0);
3323         /* msg has been consumed or freed in netlink_broadcast() */
3324         if (err && err != -ESRCH)
3325                 goto failed;
3326
3327         return;
3328
3329 nla_put_failure:
3330         nlmsg_free(msg);
3331 failed:
3332         dev_err(DEV, "Error %d while broadcasting event. "
3333                         "Event seq:%u sib_reason:%u\n",
3334                         err, seq, sib->sib_reason);
3335 }