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drbd: wait for meta data IO completion even with failed disk, unless force-detached
[mirror_ubuntu-zesty-kernel.git] / drivers / block / drbd / drbd_nl.c
CommitLineData
b411b363
PR		 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
b411b363
PR		 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>
b411b363
PR		 32#include <linux/blkpg.h>
33#include <linux/cpumask.h>
34#include "drbd_int.h"
265be2d0 35#include "drbd_req.h"
b411b363
PR		 36#include "drbd_wrappers.h"
37#include <asm/unaligned.h>
b411b363 38#include <linux/drbd_limits.h>
87f7be4c 39#include <linux/kthread.h>
b411b363 40
3b98c0c2
LE		 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
47int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info);
48int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info);
49
789c1b62
AG		 50int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info);
51int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info);
85f75dd7 52int drbd_adm_down(struct sk_buff *skb, struct genl_info *info);
3b98c0c2
LE		 53
54int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info);
55int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info);
f399002e 56int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info);
3b98c0c2
LE		 57int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info);
58int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info);
f399002e 59int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info);
3b98c0c2
LE		 60int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info);
61int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info);
62int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info);
63int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info);
64int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info);
65int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info);
66int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info);
67int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info);
68int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info);
69int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info);
70int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info);
f399002e 71int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info);
3b98c0c2
LE		 72int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info);
73int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info);
74/* .dumpit */
75int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb);
76
77#include <linux/drbd_genl_api.h>
01b39b50 78#include "drbd_nla.h"
3b98c0c2
LE		 79#include <linux/genl_magic_func.h>
80
81/* used blkdev_get_by_path, to claim our meta data device(s) */
b411b363
PR		 82static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
83
3b98c0c2
LE		 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 */
88static 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! */
7c3063cc 96 char *resource_name;
089c075d
AG		 97 struct nlattr *my_addr;
98 struct nlattr *peer_addr;
3b98c0c2
LE		 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
109static 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");
b411b363 114}
3b98c0c2
LE		 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. */
8432b314 118int drbd_msg_put_info(const char *info)
3b98c0c2
LE		 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;
b411b363
PR		 138}
139
3b98c0c2
LE		 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
44e52cfa 146#define DRBD_ADM_NEED_RESOURCE 2
089c075d 147#define DRBD_ADM_NEED_CONNECTION 4
3b98c0c2
LE		 148static int drbd_adm_prepare(struct sk_buff *skb, struct genl_info *info,
149 unsigned flags)
150{
151 struct drbd_genlmsghdr *d_in = info->userhdr;
152 const u8 cmd = info->genlhdr->cmd;
153 int err;
154
155 memset(&adm_ctx, 0, sizeof(adm_ctx));
156
157 /* genl_rcv_msg only checks for CAP_NET_ADMIN on "GENL_ADMIN_PERM" :( */
158 if (cmd != DRBD_ADM_GET_STATUS
159 && security_netlink_recv(skb, CAP_SYS_ADMIN))
160 return -EPERM;
161
162 adm_ctx.reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1e2a2551
AG		 163 if (!adm_ctx.reply_skb) {
164 err = -ENOMEM;
3b98c0c2 165 goto fail;
1e2a2551 166 }
3b98c0c2
LE		 167
168 adm_ctx.reply_dh = genlmsg_put_reply(adm_ctx.reply_skb,
169 info, &drbd_genl_family, 0, cmd);
170 /* put of a few bytes into a fresh skb of >= 4k will always succeed.
171 * but anyways */
1e2a2551
AG		 172 if (!adm_ctx.reply_dh) {
173 err = -ENOMEM;
3b98c0c2 174 goto fail;
1e2a2551 175 }
3b98c0c2
LE		 176
177 adm_ctx.reply_dh->minor = d_in->minor;
178 adm_ctx.reply_dh->ret_code = NO_ERROR;
179
089c075d 180 adm_ctx.volume = VOLUME_UNSPECIFIED;
3b98c0c2
LE		 181 if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
182 struct nlattr *nla;
183 /* parse and validate only */
f399002e 184 err = drbd_cfg_context_from_attrs(NULL, info);
3b98c0c2
LE		 185 if (err)
186 goto fail;
187
188 /* It was present, and valid,
189 * copy it over to the reply skb. */
190 err = nla_put_nohdr(adm_ctx.reply_skb,
191 info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
192 info->attrs[DRBD_NLA_CFG_CONTEXT]);
193 if (err)
194 goto fail;
195
196 /* and assign stuff to the global adm_ctx */
197 nla = nested_attr_tb[__nla_type(T_ctx_volume)];
089c075d
AG		 198 if (nla)
199 adm_ctx.volume = nla_get_u32(nla);
7c3063cc 200 nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
3b98c0c2 201 if (nla)
7c3063cc 202 adm_ctx.resource_name = nla_data(nla);
089c075d
AG		 203 adm_ctx.my_addr = nested_attr_tb[__nla_type(T_ctx_my_addr)];
204 adm_ctx.peer_addr = nested_attr_tb[__nla_type(T_ctx_peer_addr)];
205 if ((adm_ctx.my_addr &&
206 nla_len(adm_ctx.my_addr) > sizeof(adm_ctx.tconn->my_addr)) ||
207 (adm_ctx.peer_addr &&
208 nla_len(adm_ctx.peer_addr) > sizeof(adm_ctx.tconn->peer_addr))) {
209 err = -EINVAL;
210 goto fail;
211 }
212 }
3b98c0c2
LE		 213
214 adm_ctx.minor = d_in->minor;
215 adm_ctx.mdev = minor_to_mdev(d_in->minor);
7c3063cc 216 adm_ctx.tconn = conn_get_by_name(adm_ctx.resource_name);
3b98c0c2
LE		 217
218 if (!adm_ctx.mdev && (flags & DRBD_ADM_NEED_MINOR)) {
219 drbd_msg_put_info("unknown minor");
220 return ERR_MINOR_INVALID;
221 }
44e52cfa
AG		 222 if (!adm_ctx.tconn && (flags & DRBD_ADM_NEED_RESOURCE)) {
223 drbd_msg_put_info("unknown resource");
3b98c0c2
LE		 224 return ERR_INVALID_REQUEST;
225 }
226
089c075d
AG		 227 if (flags & DRBD_ADM_NEED_CONNECTION) {
228 if (adm_ctx.tconn && !(flags & DRBD_ADM_NEED_RESOURCE)) {
229 drbd_msg_put_info("no resource name expected");
230 return ERR_INVALID_REQUEST;
231 }
232 if (adm_ctx.mdev) {
233 drbd_msg_put_info("no minor number expected");
234 return ERR_INVALID_REQUEST;
235 }
236 if (adm_ctx.my_addr && adm_ctx.peer_addr)
237 adm_ctx.tconn = conn_get_by_addrs(nla_data(adm_ctx.my_addr),
238 nla_len(adm_ctx.my_addr),
239 nla_data(adm_ctx.peer_addr),
240 nla_len(adm_ctx.peer_addr));
241 if (!adm_ctx.tconn) {
242 drbd_msg_put_info("unknown connection");
243 return ERR_INVALID_REQUEST;
244 }
245 }
246
3b98c0c2 247 /* some more paranoia, if the request was over-determined */
527f4b24
LE		 248 if (adm_ctx.mdev && adm_ctx.tconn &&
249 adm_ctx.mdev->tconn != adm_ctx.tconn) {
44e52cfa 250 pr_warning("request: minor=%u, resource=%s; but that minor belongs to connection %s\n",
7c3063cc
AG		 251 adm_ctx.minor, adm_ctx.resource_name,
252 adm_ctx.mdev->tconn->name);
44e52cfa 253 drbd_msg_put_info("minor exists in different resource");
527f4b24
LE		 254 return ERR_INVALID_REQUEST;
255 }
3b98c0c2
LE		 256 if (adm_ctx.mdev &&
257 adm_ctx.volume != VOLUME_UNSPECIFIED &&
258 adm_ctx.volume != adm_ctx.mdev->vnr) {
259 pr_warning("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
260 adm_ctx.minor, adm_ctx.volume,
261 adm_ctx.mdev->vnr, adm_ctx.mdev->tconn->name);
527f4b24 262 drbd_msg_put_info("minor exists as different volume");
3b98c0c2
LE		 263 return ERR_INVALID_REQUEST;
264 }
0ace9dfa 265
3b98c0c2
LE		 266 return NO_ERROR;
267
268fail:
269 nlmsg_free(adm_ctx.reply_skb);
270 adm_ctx.reply_skb = NULL;
1e2a2551 271 return err;
3b98c0c2
LE		 272}
273
274static int drbd_adm_finish(struct genl_info *info, int retcode)
275{
0ace9dfa
PR		 276 if (adm_ctx.tconn) {
277 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
278 adm_ctx.tconn = NULL;
279 }
280
3b98c0c2
LE		 281 if (!adm_ctx.reply_skb)
282 return -ENOMEM;
283
284 adm_ctx.reply_dh->ret_code = retcode;
3b98c0c2
LE		 285 drbd_adm_send_reply(adm_ctx.reply_skb, info);
286 return 0;
287}
b411b363 288
6b75dced 289static void setup_khelper_env(struct drbd_tconn *tconn, char **envp)
b411b363 290{
6b75dced 291 char *afs;
b411b363 292
089c075d
AG		 293 /* FIXME: A future version will not allow this case. */
294 if (tconn->my_addr_len == 0 || tconn->peer_addr_len == 0)
295 return;
296
297 switch (((struct sockaddr *)&tconn->peer_addr)->sa_family) {
298 case AF_INET6:
299 afs = "ipv6";
300 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
301 &((struct sockaddr_in6 *)&tconn->peer_addr)->sin6_addr);
302 break;
303 case AF_INET:
304 afs = "ipv4";
305 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
306 &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
307 break;
308 default:
309 afs = "ssocks";
310 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
311 &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
b411b363 312 }
089c075d 313 snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
6b75dced
PR		 314}
315
316int drbd_khelper(struct drbd_conf *mdev, char *cmd)
317{
318 char *envp[] = { "HOME=/",
319 "TERM=linux",
320 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
321 (char[20]) { }, /* address family */
322 (char[60]) { }, /* address */
323 NULL };
324 char mb[12];
325 char *argv[] = {usermode_helper, cmd, mb, NULL };
6f3465ed 326 struct drbd_tconn *tconn = mdev->tconn;
6b75dced
PR		 327 struct sib_info sib;
328 int ret;
329
6f3465ed
LE		 330 if (current == tconn->worker.task)
331 set_bit(CALLBACK_PENDING, &tconn->flags);
332
6b75dced 333 snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
6f3465ed 334 setup_khelper_env(tconn, envp);
b411b363 335
1090c056
LE		 336 /* The helper may take some time.
337 * write out any unsynced meta data changes now */
338 drbd_md_sync(mdev);
339
b411b363 340 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
3b98c0c2
LE		 341 sib.sib_reason = SIB_HELPER_PRE;
342 sib.helper_name = cmd;
343 drbd_bcast_event(mdev, &sib);
b411b363
PR		 344 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
345 if (ret)
346 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
347 usermode_helper, cmd, mb,
348 (ret >> 8) & 0xff, ret);
349 else
350 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
351 usermode_helper, cmd, mb,
352 (ret >> 8) & 0xff, ret);
3b98c0c2
LE		 353 sib.sib_reason = SIB_HELPER_POST;
354 sib.helper_exit_code = ret;
355 drbd_bcast_event(mdev, &sib);
b411b363 356
6f3465ed
LE		 357 if (current == tconn->worker.task)
358 clear_bit(CALLBACK_PENDING, &tconn->flags);
359
b411b363
PR		 360 if (ret < 0) /* Ignore any ERRNOs we got. */
361 ret = 0;
362
363 return ret;
364}
365
6b75dced
PR		 366int conn_khelper(struct drbd_tconn *tconn, char *cmd)
367{
368 char *envp[] = { "HOME=/",
369 "TERM=linux",
370 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
371 (char[20]) { }, /* address family */
372 (char[60]) { }, /* address */
373 NULL };
374 char *argv[] = {usermode_helper, cmd, tconn->name, NULL };
375 int ret;
376
377 setup_khelper_env(tconn, envp);
378 conn_md_sync(tconn);
379
380 conn_info(tconn, "helper command: %s %s %s\n", usermode_helper, cmd, tconn->name);
381 /* TODO: conn_bcast_event() ?? */
382
383 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
384 if (ret)
385 conn_warn(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
386 usermode_helper, cmd, tconn->name,
387 (ret >> 8) & 0xff, ret);
388 else
389 conn_info(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
390 usermode_helper, cmd, tconn->name,
391 (ret >> 8) & 0xff, ret);
392 /* TODO: conn_bcast_event() ?? */
393
394 if (ret < 0) /* Ignore any ERRNOs we got. */
395 ret = 0;
396
397 return ret;
398}
399
cb703454 400static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
b411b363 401{
cb703454
PR		 402 enum drbd_fencing_p fp = FP_NOT_AVAIL;
403 struct drbd_conf *mdev;
404 int vnr;
405
695d08fa 406 rcu_read_lock();
cb703454
PR		 407 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
408 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
daeda1cc
PR		 409 fp = max_t(enum drbd_fencing_p, fp,
410 rcu_dereference(mdev->ldev->disk_conf)->fencing);
cb703454
PR		 411 put_ldev(mdev);
412 }
413 }
695d08fa 414 rcu_read_unlock();
cb703454
PR		 415
416 return fp;
417}
418
419bool conn_try_outdate_peer(struct drbd_tconn *tconn)
420{
421 union drbd_state mask = { };
422 union drbd_state val = { };
423 enum drbd_fencing_p fp;
b411b363
PR		 424 char *ex_to_string;
425 int r;
b411b363 426
cb703454
PR		 427 if (tconn->cstate >= C_WF_REPORT_PARAMS) {
428 conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");
429 return false;
430 }
b411b363 431
cb703454
PR		 432 fp = highest_fencing_policy(tconn);
433 switch (fp) {
434 case FP_NOT_AVAIL:
435 conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");
fb22c402 436 goto out;
cb703454
PR		 437 case FP_DONT_CARE:
438 return true;
439 default: ;
b411b363
PR		 440 }
441
cb703454 442 r = conn_khelper(tconn, "fence-peer");
b411b363
PR		 443
444 switch ((r>>8) & 0xff) {
445 case 3: /* peer is inconsistent */
446 ex_to_string = "peer is inconsistent or worse";
cb703454
PR		 447 mask.pdsk = D_MASK;
448 val.pdsk = D_INCONSISTENT;
b411b363
PR		 449 break;
450 case 4: /* peer got outdated, or was already outdated */
451 ex_to_string = "peer was fenced";
cb703454
PR		 452 mask.pdsk = D_MASK;
453 val.pdsk = D_OUTDATED;
b411b363
PR		 454 break;
455 case 5: /* peer was down */
cb703454 456 if (conn_highest_disk(tconn) == D_UP_TO_DATE) {
b411b363
PR		 457 /* we will(have) create(d) a new UUID anyways... */
458 ex_to_string = "peer is unreachable, assumed to be dead";
cb703454
PR		 459 mask.pdsk = D_MASK;
460 val.pdsk = D_OUTDATED;
b411b363
PR		 461 } else {
462 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
b411b363
PR		 463 }
464 break;
465 case 6: /* Peer is primary, voluntarily outdate myself.
466 * This is useful when an unconnected R_SECONDARY is asked to
467 * become R_PRIMARY, but finds the other peer being active. */
468 ex_to_string = "peer is active";
cb703454
PR		 469 conn_warn(tconn, "Peer is primary, outdating myself.\n");
470 mask.disk = D_MASK;
471 val.disk = D_OUTDATED;
b411b363
PR		 472 break;
473 case 7:
474 if (fp != FP_STONITH)
cb703454 475 conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");
b411b363 476 ex_to_string = "peer was stonithed";
cb703454
PR		 477 mask.pdsk = D_MASK;
478 val.pdsk = D_OUTDATED;
b411b363
PR		 479 break;
480 default:
481 /* The script is broken ... */
cb703454
PR		 482 conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
483 return false; /* Eventually leave IO frozen */
b411b363
PR		 484 }
485
cb703454
PR		 486 conn_info(tconn, "fence-peer helper returned %d (%s)\n",
487 (r>>8) & 0xff, ex_to_string);
fb22c402 488
cb703454 489 out:
fb22c402 490
cb703454
PR		 491 /* Not using
492 conn_request_state(tconn, mask, val, CS_VERBOSE);
493 here, because we might were able to re-establish the connection in the
494 meantime. */
495 spin_lock_irq(&tconn->req_lock);
a1096a6e 496 if (tconn->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &tconn->flags))
cb703454
PR		 497 _conn_request_state(tconn, mask, val, CS_VERBOSE);
498 spin_unlock_irq(&tconn->req_lock);
499
500 return conn_highest_pdsk(tconn) <= D_OUTDATED;
b411b363
PR		 501}
502
87f7be4c
PR		 503static int _try_outdate_peer_async(void *data)
504{
cb703454 505 struct drbd_tconn *tconn = (struct drbd_tconn *)data;
87f7be4c 506
cb703454 507 conn_try_outdate_peer(tconn);
87f7be4c 508
9dc9fbb3 509 kref_put(&tconn->kref, &conn_destroy);
87f7be4c
PR		 510 return 0;
511}
512
cb703454 513void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
87f7be4c
PR		 514{
515 struct task_struct *opa;
516
9dc9fbb3 517 kref_get(&tconn->kref);
cb703454 518 opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
9dc9fbb3 519 if (IS_ERR(opa)) {
cb703454 520 conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
9dc9fbb3
PR		 521 kref_put(&tconn->kref, &conn_destroy);
522 }
87f7be4c 523}
b411b363 524
bf885f8a
AG		 525enum drbd_state_rv
526drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
b411b363
PR		 527{
528 const int max_tries = 4;
bf885f8a 529 enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
44ed167d 530 struct net_conf *nc;
b411b363
PR		 531 int try = 0;
532 int forced = 0;
533 union drbd_state mask, val;
b411b363
PR		 534
535 if (new_role == R_PRIMARY)
0625ac19 536 request_ping(mdev->tconn); /* Detect a dead peer ASAP */
b411b363 537
8410da8f 538 mutex_lock(mdev->state_mutex);
b411b363
PR		 539
540 mask.i = 0; mask.role = R_MASK;
541 val.i = 0; val.role = new_role;
542
543 while (try++ < max_tries) {
bf885f8a 544 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
b411b363
PR		 545
546 /* in case we first succeeded to outdate,
547 * but now suddenly could establish a connection */
bf885f8a 548 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
b411b363
PR		 549 val.pdsk = 0;
550 mask.pdsk = 0;
551 continue;
552 }
553
bf885f8a 554 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
d10a33c6
PR		 555 (mdev->state.disk < D_UP_TO_DATE &&
556 mdev->state.disk >= D_INCONSISTENT)) {
b411b363
PR		 557 mask.disk = D_MASK;
558 val.disk = D_UP_TO_DATE;
559 forced = 1;
560 continue;
561 }
562
bf885f8a 563 if (rv == SS_NO_UP_TO_DATE_DISK &&
b411b363
PR		 564 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
565 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
b411b363 566
cb703454 567 if (conn_try_outdate_peer(mdev->tconn)) {
b411b363
PR		 568 val.disk = D_UP_TO_DATE;
569 mask.disk = D_MASK;
570 }
b411b363
PR		 571 continue;
572 }
573
bf885f8a 574 if (rv == SS_NOTHING_TO_DO)
3b98c0c2 575 goto out;
bf885f8a 576 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
cb703454 577 if (!conn_try_outdate_peer(mdev->tconn) && force) {
b411b363 578 dev_warn(DEV, "Forced into split brain situation!\n");
cb703454
PR		 579 mask.pdsk = D_MASK;
580 val.pdsk = D_OUTDATED;
b411b363 581
cb703454 582 }
b411b363
PR		 583 continue;
584 }
bf885f8a 585 if (rv == SS_TWO_PRIMARIES) {
b411b363
PR		 586 /* Maybe the peer is detected as dead very soon...
587 retry at most once more in this case. */
44ed167d
PR		 588 int timeo;
589 rcu_read_lock();
590 nc = rcu_dereference(mdev->tconn->net_conf);
591 timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
592 rcu_read_unlock();
593 schedule_timeout_interruptible(timeo);
b411b363
PR		 594 if (try < max_tries)
595 try = max_tries - 1;
596 continue;
597 }
bf885f8a
AG		 598 if (rv < SS_SUCCESS) {
599 rv = _drbd_request_state(mdev, mask, val,
b411b363 600 CS_VERBOSE + CS_WAIT_COMPLETE);
bf885f8a 601 if (rv < SS_SUCCESS)
3b98c0c2 602 goto out;
b411b363
PR		 603 }
604 break;
605 }
606
bf885f8a 607 if (rv < SS_SUCCESS)
3b98c0c2 608 goto out;
b411b363
PR		 609
610 if (forced)
611 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
612
613 /* Wait until nothing is on the fly :) */
614 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
615
b6dd1a89
LE		 616 /* FIXME also wait for all pending P_BARRIER_ACK? */
617
b411b363 618 if (new_role == R_SECONDARY) {
81e84650 619 set_disk_ro(mdev->vdisk, true);
b411b363
PR		 620 if (get_ldev(mdev)) {
621 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
622 put_ldev(mdev);
623 }
624 } else {
a0095508 625 mutex_lock(&mdev->tconn->conf_update);
91fd4dad 626 nc = mdev->tconn->net_conf;
44ed167d 627 if (nc)
6139f60d 628 nc->discard_my_data = 0; /* without copy; single bit op is atomic */
a0095508 629 mutex_unlock(&mdev->tconn->conf_update);
91fd4dad 630
81e84650 631 set_disk_ro(mdev->vdisk, false);
b411b363
PR		 632 if (get_ldev(mdev)) {
633 if (((mdev->state.conn < C_CONNECTED ||
634 mdev->state.pdsk <= D_FAILED)
635 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
636 drbd_uuid_new_current(mdev);
637
638 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
639 put_ldev(mdev);
640 }
641 }
642
19f843aa
LE		 643 /* writeout of activity log covered areas of the bitmap
644 * to stable storage done in after state change already */
b411b363
PR		 645
646 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
647 /* if this was forced, we should consider sync */
648 if (forced)
649 drbd_send_uuids(mdev);
43de7c85 650 drbd_send_current_state(mdev);
b411b363
PR		 651 }
652
653 drbd_md_sync(mdev);
654
655 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
3b98c0c2 656out:
8410da8f 657 mutex_unlock(mdev->state_mutex);
bf885f8a 658 return rv;
b411b363
PR		 659}
660
3b98c0c2 661static const char *from_attrs_err_to_txt(int err)
b411b363 662{
3b98c0c2
LE		 663 return err == -ENOMSG ? "required attribute missing" :
664 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
f399002e 665 err == -EEXIST ? "can not change invariant setting" :
3b98c0c2 666 "invalid attribute value";
b411b363
PR		 667}
668
3b98c0c2 669int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
b411b363 670{
3b98c0c2
LE		 671 struct set_role_parms parms;
672 int err;
673 enum drbd_ret_code retcode;
b411b363 674
3b98c0c2
LE		 675 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
676 if (!adm_ctx.reply_skb)
677 return retcode;
678 if (retcode != NO_ERROR)
679 goto out;
680
681 memset(&parms, 0, sizeof(parms));
682 if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
f399002e 683 err = set_role_parms_from_attrs(&parms, info);
3b98c0c2
LE		 684 if (err) {
685 retcode = ERR_MANDATORY_TAG;
686 drbd_msg_put_info(from_attrs_err_to_txt(err));
687 goto out;
688 }
689 }
690
691 if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
692 retcode = drbd_set_role(adm_ctx.mdev, R_PRIMARY, parms.assume_uptodate);
693 else
694 retcode = drbd_set_role(adm_ctx.mdev, R_SECONDARY, 0);
695out:
696 drbd_adm_finish(info, retcode);
b411b363
PR		 697 return 0;
698}
699
700/* initializes the md.*_offset members, so we are able to find
701 * the on disk meta data */
702static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
703 struct drbd_backing_dev *bdev)
704{
705 sector_t md_size_sect = 0;
daeda1cc
PR		 706 int meta_dev_idx;
707
708 rcu_read_lock();
709 meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
710
711 switch (meta_dev_idx) {
b411b363
PR		 712 default:
713 /* v07 style fixed size indexed meta data */
714 bdev->md.md_size_sect = MD_RESERVED_SECT;
715 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
716 bdev->md.al_offset = MD_AL_OFFSET;
717 bdev->md.bm_offset = MD_BM_OFFSET;
718 break;
719 case DRBD_MD_INDEX_FLEX_EXT:
720 /* just occupy the full device; unit: sectors */
721 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
722 bdev->md.md_offset = 0;
723 bdev->md.al_offset = MD_AL_OFFSET;
724 bdev->md.bm_offset = MD_BM_OFFSET;
725 break;
726 case DRBD_MD_INDEX_INTERNAL:
727 case DRBD_MD_INDEX_FLEX_INT:
728 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
729 /* al size is still fixed */
7ad651b5 730 bdev->md.al_offset = -MD_AL_SECTORS;
b411b363
PR		 731 /* we need (slightly less than) ~ this much bitmap sectors: */
732 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
733 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
734 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
735 md_size_sect = ALIGN(md_size_sect, 8);
736
737 /* plus the "drbd meta data super block",
738 * and the activity log; */
739 md_size_sect += MD_BM_OFFSET;
740
741 bdev->md.md_size_sect = md_size_sect;
742 /* bitmap offset is adjusted by 'super' block size */
743 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
744 break;
745 }
daeda1cc 746 rcu_read_unlock();
b411b363
PR		 747}
748
4b0715f0 749/* input size is expected to be in KB */
b411b363
PR		 750char *ppsize(char *buf, unsigned long long size)
751{
4b0715f0
LE		 752 /* Needs 9 bytes at max including trailing NUL:
753 * -1ULL ==> "16384 EB" */
b411b363
PR		 754 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
755 int base = 0;
4b0715f0 756 while (size >= 10000 && base < sizeof(units)-1) {
b411b363
PR		 757 /* shift + round */
758 size = (size >> 10) + !!(size & (1<<9));
759 base++;
760 }
4b0715f0 761 sprintf(buf, "%u %cB", (unsigned)size, units[base]);
b411b363
PR		 762
763 return buf;
764}
765
766/* there is still a theoretical deadlock when called from receiver
767 * on an D_INCONSISTENT R_PRIMARY:
768 * remote READ does inc_ap_bio, receiver would need to receive answer
769 * packet from remote to dec_ap_bio again.
770 * receiver receive_sizes(), comes here,
771 * waits for ap_bio_cnt == 0. -> deadlock.
772 * but this cannot happen, actually, because:
773 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
774 * (not connected, or bad/no disk on peer):
775 * see drbd_fail_request_early, ap_bio_cnt is zero.
776 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
777 * peer may not initiate a resize.
778 */
3b98c0c2
LE		 779/* Note these are not to be confused with
780 * drbd_adm_suspend_io/drbd_adm_resume_io,
781 * which are (sub) state changes triggered by admin (drbdsetup),
782 * and can be long lived.
783 * This changes an mdev->flag, is triggered by drbd internals,
784 * and should be short-lived. */
b411b363
PR		 785void drbd_suspend_io(struct drbd_conf *mdev)
786{
787 set_bit(SUSPEND_IO, &mdev->flags);
2aebfabb 788 if (drbd_suspended(mdev))
265be2d0 789 return;
b411b363
PR		 790 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
791}
792
793void drbd_resume_io(struct drbd_conf *mdev)
794{
795 clear_bit(SUSPEND_IO, &mdev->flags);
796 wake_up(&mdev->misc_wait);
797}
798
799/**
800 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
801 * @mdev: DRBD device.
802 *
803 * Returns 0 on success, negative return values indicate errors.
804 * You should call drbd_md_sync() after calling this function.
805 */
24c4830c 806enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
b411b363
PR		 807{
808 sector_t prev_first_sect, prev_size; /* previous meta location */
ef5e44a6 809 sector_t la_size, u_size;
b411b363
PR		 810 sector_t size;
811 char ppb[10];
812
813 int md_moved, la_size_changed;
814 enum determine_dev_size rv = unchanged;
815
816 /* race:
817 * application request passes inc_ap_bio,
818 * but then cannot get an AL-reference.
819 * this function later may wait on ap_bio_cnt == 0. -> deadlock.
820 *
821 * to avoid that:
822 * Suspend IO right here.
823 * still lock the act_log to not trigger ASSERTs there.
824 */
825 drbd_suspend_io(mdev);
826
827 /* no wait necessary anymore, actually we could assert that */
828 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
829
830 prev_first_sect = drbd_md_first_sector(mdev->ldev);
831 prev_size = mdev->ldev->md.md_size_sect;
832 la_size = mdev->ldev->md.la_size_sect;
833
834 /* TODO: should only be some assert here, not (re)init... */
835 drbd_md_set_sector_offsets(mdev, mdev->ldev);
836
daeda1cc
PR		 837 rcu_read_lock();
838 u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
839 rcu_read_unlock();
ef5e44a6 840 size = drbd_new_dev_size(mdev, mdev->ldev, u_size, flags & DDSF_FORCED);
b411b363
PR		 841
842 if (drbd_get_capacity(mdev->this_bdev) != size ||
843 drbd_bm_capacity(mdev) != size) {
844 int err;
02d9a94b 845 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
b411b363
PR		 846 if (unlikely(err)) {
847 /* currently there is only one error: ENOMEM! */
848 size = drbd_bm_capacity(mdev)>>1;
849 if (size == 0) {
850 dev_err(DEV, "OUT OF MEMORY! "
851 "Could not allocate bitmap!\n");
852 } else {
853 dev_err(DEV, "BM resizing failed. "
854 "Leaving size unchanged at size = %lu KB\n",
855 (unsigned long)size);
856 }
857 rv = dev_size_error;
858 }
859 /* racy, see comments above. */
860 drbd_set_my_capacity(mdev, size);
861 mdev->ldev->md.la_size_sect = size;
862 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
863 (unsigned long long)size>>1);
864 }
865 if (rv == dev_size_error)
866 goto out;
867
868 la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
869
870 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
871 || prev_size != mdev->ldev->md.md_size_sect;
872
873 if (la_size_changed || md_moved) {
24dccabb
AG		 874 int err;
875
b411b363
PR		 876 drbd_al_shrink(mdev); /* All extents inactive. */
877 dev_info(DEV, "Writing the whole bitmap, %s\n",
878 la_size_changed && md_moved ? "size changed and md moved" :
879 la_size_changed ? "size changed" : "md moved");
20ceb2b2 880 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
fef45d29
PR		 881 err = drbd_bitmap_io(mdev, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
882 "size changed", BM_LOCKED_MASK);
24dccabb
AG		 883 if (err) {
884 rv = dev_size_error;
885 goto out;
886 }
b411b363
PR		 887 drbd_md_mark_dirty(mdev);
888 }
889
890 if (size > la_size)
891 rv = grew;
892 if (size < la_size)
893 rv = shrunk;
894out:
895 lc_unlock(mdev->act_log);
896 wake_up(&mdev->al_wait);
897 drbd_resume_io(mdev);
898
899 return rv;
900}
901
902sector_t
ef5e44a6
PR		 903drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
904 sector_t u_size, int assume_peer_has_space)
b411b363
PR		 905{
906 sector_t p_size = mdev->p_size; /* partner's disk size. */
907 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
908 sector_t m_size; /* my size */
b411b363
PR		 909 sector_t size = 0;
910
911 m_size = drbd_get_max_capacity(bdev);
912
a393db6f
PR		 913 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
914 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
915 p_size = m_size;
916 }
917
b411b363
PR		 918 if (p_size && m_size) {
919 size = min_t(sector_t, p_size, m_size);
920 } else {
921 if (la_size) {
922 size = la_size;
923 if (m_size && m_size < size)
924 size = m_size;
925 if (p_size && p_size < size)
926 size = p_size;
927 } else {
928 if (m_size)
929 size = m_size;
930 if (p_size)
931 size = p_size;
932 }
933 }
934
935 if (size == 0)
936 dev_err(DEV, "Both nodes diskless!\n");
937
938 if (u_size) {
939 if (u_size > size)
940 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
941 (unsigned long)u_size>>1, (unsigned long)size>>1);
942 else
943 size = u_size;
944 }
945
946 return size;
947}
948
949/**
950 * drbd_check_al_size() - Ensures that the AL is of the right size
951 * @mdev: DRBD device.
952 *
953 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
954 * failed, and 0 on success. You should call drbd_md_sync() after you called
955 * this function.
956 */
f399002e 957static int drbd_check_al_size(struct drbd_conf *mdev, struct disk_conf *dc)
b411b363
PR		 958{
959 struct lru_cache *n, *t;
960 struct lc_element *e;
961 unsigned int in_use;
962 int i;
963
b411b363 964 if (mdev->act_log &&
f399002e 965 mdev->act_log->nr_elements == dc->al_extents)
b411b363
PR		 966 return 0;
967
968 in_use = 0;
969 t = mdev->act_log;
7ad651b5 970 n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
f399002e 971 dc->al_extents, sizeof(struct lc_element), 0);
b411b363
PR		 972
973 if (n == NULL) {
974 dev_err(DEV, "Cannot allocate act_log lru!\n");
975 return -ENOMEM;
976 }
977 spin_lock_irq(&mdev->al_lock);
978 if (t) {
979 for (i = 0; i < t->nr_elements; i++) {
980 e = lc_element_by_index(t, i);
981 if (e->refcnt)
982 dev_err(DEV, "refcnt(%d)==%d\n",
983 e->lc_number, e->refcnt);
984 in_use += e->refcnt;
985 }
986 }
987 if (!in_use)
988 mdev->act_log = n;
989 spin_unlock_irq(&mdev->al_lock);
990 if (in_use) {
991 dev_err(DEV, "Activity log still in use!\n");
992 lc_destroy(n);
993 return -EBUSY;
994 } else {
995 if (t)
996 lc_destroy(t);
997 }
998 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
999 return 0;
1000}
1001
99432fcc 1002static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
b411b363
PR		 1003{
1004 struct request_queue * const q = mdev->rq_queue;
99432fcc
PR		 1005 int max_hw_sectors = max_bio_size >> 9;
1006 int max_segments = 0;
1007
1008 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1009 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1010
1011 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
daeda1cc
PR		 1012 rcu_read_lock();
1013 max_segments = rcu_dereference(mdev->ldev->disk_conf)->max_bio_bvecs;
1014 rcu_read_unlock();
99432fcc
PR		 1015 put_ldev(mdev);
1016 }
b411b363 1017
b411b363 1018 blk_queue_logical_block_size(q, 512);
1816a2b4
LE		 1019 blk_queue_max_hw_sectors(q, max_hw_sectors);
1020 /* This is the workaround for "bio would need to, but cannot, be split" */
1021 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1022 blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
b411b363 1023
99432fcc
PR		 1024 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1025 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1026
1027 blk_queue_stack_limits(q, b);
1028
1029 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
1030 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
1031 q->backing_dev_info.ra_pages,
1032 b->backing_dev_info.ra_pages);
1033 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1034 }
1035 put_ldev(mdev);
1036 }
1037}
1038
1039void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
1040{
1041 int now, new, local, peer;
1042
1043 now = queue_max_hw_sectors(mdev->rq_queue) << 9;
1044 local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
1045 peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
b411b363 1046
99432fcc
PR		 1047 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1048 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
1049 mdev->local_max_bio_size = local;
1050 put_ldev(mdev);
b411b363 1051 }
99432fcc
PR		 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) {
31890f4a 1057 if (mdev->tconn->agreed_pro_version < 94)
2ffca4f3
PR		 1058 peer = min_t(int, 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 */
31890f4a 1060 else if (mdev->tconn->agreed_pro_version == 94)
99432fcc 1061 peer = DRBD_MAX_SIZE_H80_PACKET;
2ffca4f3
PR		 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
99432fcc
PR		 1065 peer = DRBD_MAX_BIO_SIZE;
1066 }
1067
1068 new = min_t(int, local, peer);
1069
1070 if (mdev->state.role == R_PRIMARY && new < now)
1071 dev_err(DEV, "ASSERT FAILED new < now; (%d < %d)\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);
b411b363
PR		 1077}
1078
a18e9d1e 1079/* Starts the worker thread */
0e29d163 1080static void conn_reconfig_start(struct drbd_tconn *tconn)
b411b363 1081{
0e29d163
PR		 1082 drbd_thread_start(&tconn->worker);
1083 conn_flush_workqueue(tconn);
b411b363
PR		 1084}
1085
a18e9d1e 1086/* if still unconfigured, stops worker again. */
0e29d163 1087static void conn_reconfig_done(struct drbd_tconn *tconn)
b411b363 1088{
992d6e91 1089 bool stop_threads;
0e29d163 1090 spin_lock_irq(&tconn->req_lock);
e0e16653
PR		 1091 stop_threads = conn_all_vols_unconf(tconn) &&
1092 tconn->cstate == C_STANDALONE;
0e29d163 1093 spin_unlock_irq(&tconn->req_lock);
992d6e91
LE		 1094 if (stop_threads) {
1095 /* asender is implicitly stopped by receiver
81fa2e67 1096 * in conn_disconnect() */
992d6e91
LE		 1097 drbd_thread_stop(&tconn->receiver);
1098 drbd_thread_stop(&tconn->worker);
1099 }
b411b363
PR		 1100}
1101
0778286a
PR		 1102/* Make sure IO is suspended before calling this function(). */
1103static void drbd_suspend_al(struct drbd_conf *mdev)
1104{
1105 int s = 0;
1106
61610420 1107 if (!lc_try_lock(mdev->act_log)) {
0778286a
PR		 1108 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
1109 return;
1110 }
1111
61610420 1112 drbd_al_shrink(mdev);
87eeee41 1113 spin_lock_irq(&mdev->tconn->req_lock);
0778286a
PR		 1114 if (mdev->state.conn < C_CONNECTED)
1115 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
87eeee41 1116 spin_unlock_irq(&mdev->tconn->req_lock);
61610420 1117 lc_unlock(mdev->act_log);
0778286a
PR		 1118
1119 if (s)
1120 dev_info(DEV, "Suspended AL updates\n");
1121}
1122
5979e361
LE		 1123
1124static 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
d589a21e
PR		 1130static 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
f399002e
LE		 1141int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1142{
1143 enum drbd_ret_code retcode;
1144 struct drbd_conf *mdev;
daeda1cc 1145 struct disk_conf *new_disk_conf, *old_disk_conf;
813472ce 1146 struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
f399002e 1147 int err, fifo_size;
f399002e
LE		 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
daeda1cc 1164 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
5ecc72c3 1165 if (!new_disk_conf) {
f399002e
LE		 1166 retcode = ERR_NOMEM;
1167 goto fail;
1168 }
1169
daeda1cc
PR		 1170 mutex_lock(&mdev->tconn->conf_update);
1171 old_disk_conf = mdev->ldev->disk_conf;
1172 *new_disk_conf = *old_disk_conf;
5979e361 1173 if (should_set_defaults(info))
b966b5dd 1174 set_disk_conf_defaults(new_disk_conf);
5979e361 1175
5ecc72c3 1176 err = disk_conf_from_attrs_for_change(new_disk_conf, info);
c75b9b10 1177 if (err && err != -ENOMSG) {
f399002e
LE		 1178 retcode = ERR_MANDATORY_TAG;
1179 drbd_msg_put_info(from_attrs_err_to_txt(err));
1180 }
1181
5ecc72c3
LE		 1182 if (!expect(new_disk_conf->resync_rate >= 1))
1183 new_disk_conf->resync_rate = 1;
f399002e 1184
d589a21e 1185 enforce_disk_conf_limits(new_disk_conf);
f399002e 1186
5ecc72c3 1187 fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
9958c857 1188 if (fifo_size != mdev->rs_plan_s->size) {
813472ce
PR		 1189 new_plan = fifo_alloc(fifo_size);
1190 if (!new_plan) {
f399002e
LE		 1191 dev_err(DEV, "kmalloc of fifo_buffer failed");
1192 retcode = ERR_NOMEM;
daeda1cc 1193 goto fail_unlock;
f399002e
LE		 1194 }
1195 }
1196
0ee98e2e 1197 drbd_suspend_io(mdev);
f399002e
LE		 1198 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1199 drbd_al_shrink(mdev);
5ecc72c3 1200 err = drbd_check_al_size(mdev, new_disk_conf);
f399002e
LE		 1201 lc_unlock(mdev->act_log);
1202 wake_up(&mdev->al_wait);
0ee98e2e 1203 drbd_resume_io(mdev);
f399002e
LE		 1204
1205 if (err) {
1206 retcode = ERR_NOMEM;
daeda1cc 1207 goto fail_unlock;
f399002e
LE		 1208 }
1209
dc97b708 1210 write_lock_irq(&global_state_lock);
95f8efd0 1211 retcode = drbd_resync_after_valid(mdev, new_disk_conf->resync_after);
dc97b708 1212 if (retcode == NO_ERROR) {
daeda1cc 1213 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
95f8efd0 1214 drbd_resync_after_changed(mdev);
dc97b708
PR		 1215 }
1216 write_unlock_irq(&global_state_lock);
f399002e 1217
daeda1cc
PR		 1218 if (retcode != NO_ERROR)
1219 goto fail_unlock;
f399002e 1220
813472ce
PR		 1221 if (new_plan) {
1222 old_plan = mdev->rs_plan_s;
1223 rcu_assign_pointer(mdev->rs_plan_s, new_plan);
9958c857 1224 }
9958c857 1225
c141ebda 1226 mutex_unlock(&mdev->tconn->conf_update);
27eb13e9 1227
9a51ab1c
PR		 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
27eb13e9
PR		 1233 drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1234
daeda1cc 1235 drbd_md_sync(mdev);
f399002e
LE		 1236
1237 if (mdev->state.conn >= C_CONNECTED)
1238 drbd_send_sync_param(mdev);
1239
daeda1cc
PR		 1240 synchronize_rcu();
1241 kfree(old_disk_conf);
813472ce 1242 kfree(old_plan);
cdfda633 1243 mod_timer(&mdev->request_timer, jiffies + HZ);
daeda1cc
PR		 1244 goto success;
1245
1246fail_unlock:
1247 mutex_unlock(&mdev->tconn->conf_update);
f399002e 1248 fail:
5ecc72c3 1249 kfree(new_disk_conf);
813472ce 1250 kfree(new_plan);
daeda1cc
PR		 1251success:
1252 put_ldev(mdev);
f399002e
LE		 1253 out:
1254 drbd_adm_finish(info, retcode);
1255 return 0;
1256}
1257
3b98c0c2 1258int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
b411b363 1259{
3b98c0c2
LE		 1260 struct drbd_conf *mdev;
1261 int err;
116676ca 1262 enum drbd_ret_code retcode;
b411b363
PR		 1263 enum determine_dev_size dd;
1264 sector_t max_possible_sectors;
1265 sector_t min_md_device_sectors;
1266 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
daeda1cc 1267 struct disk_conf *new_disk_conf = NULL;
e525fd89 1268 struct block_device *bdev;
b411b363 1269 struct lru_cache *resync_lru = NULL;
9958c857 1270 struct fifo_buffer *new_plan = NULL;
b411b363 1271 union drbd_state ns, os;
f2024e7c 1272 enum drbd_state_rv rv;
44ed167d 1273 struct net_conf *nc;
b411b363 1274
3b98c0c2
LE		 1275 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1276 if (!adm_ctx.reply_skb)
1277 return retcode;
1278 if (retcode != NO_ERROR)
40cbf085 1279 goto finish;
3b98c0c2
LE		 1280
1281 mdev = adm_ctx.mdev;
0e29d163 1282 conn_reconfig_start(mdev->tconn);
b411b363
PR		 1283
1284 /* if you want to reconfigure, please tear down first */
1285 if (mdev->state.disk > D_DISKLESS) {
1286 retcode = ERR_DISK_CONFIGURED;
1287 goto fail;
1288 }
82f59cc6
LE		 1289 /* It may just now have detached because of IO error. Make sure
1290 * drbd_ldev_destroy is done already, we may end up here very fast,
1291 * e.g. if someone calls attach from the on-io-error handler,
1292 * to realize a "hot spare" feature (not that I'd recommend that) */
1293 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
b411b363 1294
0c849666
LE		 1295 /* make sure there is no leftover from previous force-detach attempts */
1296 clear_bit(FORCE_DETACH, &mdev->flags);
1297
a324896b
LE		 1298 /* and no leftover from previously aborted resync or verify, either */
1299 mdev->rs_total = 0;
1300 mdev->rs_failed = 0;
1301 atomic_set(&mdev->rs_pending_cnt, 0);
1302
3b98c0c2 1303 /* allocation not in the IO path, drbdsetup context */
b411b363
PR		 1304 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1305 if (!nbc) {
1306 retcode = ERR_NOMEM;
1307 goto fail;
1308 }
39a1aa7f
PR		 1309 spin_lock_init(&nbc->md.uuid_lock);
1310
daeda1cc
PR		 1311 new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1312 if (!new_disk_conf) {
1313 retcode = ERR_NOMEM;
1314 goto fail;
1315 }
1316 nbc->disk_conf = new_disk_conf;
b411b363 1317
daeda1cc
PR		 1318 set_disk_conf_defaults(new_disk_conf);
1319 err = disk_conf_from_attrs(new_disk_conf, info);
3b98c0c2 1320 if (err) {
b411b363 1321 retcode = ERR_MANDATORY_TAG;
3b98c0c2 1322 drbd_msg_put_info(from_attrs_err_to_txt(err));
b411b363
PR		 1323 goto fail;
1324 }
1325
d589a21e
PR		 1326 enforce_disk_conf_limits(new_disk_conf);
1327
9958c857
PR		 1328 new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1329 if (!new_plan) {
1330 retcode = ERR_NOMEM;
1331 goto fail;
1332 }
1333
daeda1cc 1334 if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
b411b363
PR		 1335 retcode = ERR_MD_IDX_INVALID;
1336 goto fail;
1337 }
1338
44ed167d
PR		 1339 rcu_read_lock();
1340 nc = rcu_dereference(mdev->tconn->net_conf);
1341 if (nc) {
daeda1cc 1342 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
44ed167d 1343 rcu_read_unlock();
47ff2d0a
PR		 1344 retcode = ERR_STONITH_AND_PROT_A;
1345 goto fail;
1346 }
1347 }
44ed167d 1348 rcu_read_unlock();
47ff2d0a 1349
daeda1cc 1350 bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
d4d77629 1351 FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
e525fd89 1352 if (IS_ERR(bdev)) {
daeda1cc 1353 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
e525fd89 1354 PTR_ERR(bdev));
b411b363
PR		 1355 retcode = ERR_OPEN_DISK;
1356 goto fail;
1357 }
e525fd89
TH		 1358 nbc->backing_bdev = bdev;
1359
1360 /*
1361 * meta_dev_idx >= 0: external fixed size, possibly multiple
1362 * drbd sharing one meta device. TODO in that case, paranoia
1363 * check that [md_bdev, meta_dev_idx] is not yet used by some
1364 * other drbd minor! (if you use drbd.conf + drbdadm, that
1365 * should check it for you already; but if you don't, or
1366 * someone fooled it, we need to double check here)
1367 */
daeda1cc 1368 bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
d4d77629 1369 FMODE_READ | FMODE_WRITE | FMODE_EXCL,
daeda1cc 1370 (new_disk_conf->meta_dev_idx < 0) ?
d4d77629 1371 (void *)mdev : (void *)drbd_m_holder);
e525fd89 1372 if (IS_ERR(bdev)) {
daeda1cc 1373 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
e525fd89 1374 PTR_ERR(bdev));
b411b363
PR		 1375 retcode = ERR_OPEN_MD_DISK;
1376 goto fail;
1377 }
e525fd89 1378 nbc->md_bdev = bdev;
b411b363 1379
e525fd89 1380 if ((nbc->backing_bdev == nbc->md_bdev) !=
daeda1cc
PR		 1381 (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1382 new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
e525fd89 1383 retcode = ERR_MD_IDX_INVALID;
b411b363
PR		 1384 goto fail;
1385 }
1386
1387 resync_lru = lc_create("resync", drbd_bm_ext_cache,
46a15bc3 1388 1, 61, sizeof(struct bm_extent),
b411b363
PR		 1389 offsetof(struct bm_extent, lce));
1390 if (!resync_lru) {
1391 retcode = ERR_NOMEM;
e525fd89 1392 goto fail;
b411b363
PR		 1393 }
1394
1395 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1396 drbd_md_set_sector_offsets(mdev, nbc);
1397
daeda1cc 1398 if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
b411b363
PR		 1399 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1400 (unsigned long long) drbd_get_max_capacity(nbc),
daeda1cc 1401 (unsigned long long) new_disk_conf->disk_size);
67b58bf7 1402 retcode = ERR_DISK_TOO_SMALL;
e525fd89 1403 goto fail;
b411b363
PR		 1404 }
1405
daeda1cc 1406 if (new_disk_conf->meta_dev_idx < 0) {
b411b363
PR		 1407 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1408 /* at least one MB, otherwise it does not make sense */
1409 min_md_device_sectors = (2<<10);
1410 } else {
1411 max_possible_sectors = DRBD_MAX_SECTORS;
daeda1cc 1412 min_md_device_sectors = MD_RESERVED_SECT * (new_disk_conf->meta_dev_idx + 1);
b411b363
PR		 1413 }
1414
b411b363 1415 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
67b58bf7 1416 retcode = ERR_MD_DISK_TOO_SMALL;
b411b363
PR		 1417 dev_warn(DEV, "refusing attach: md-device too small, "
1418 "at least %llu sectors needed for this meta-disk type\n",
1419 (unsigned long long) min_md_device_sectors);
e525fd89 1420 goto fail;
b411b363
PR		 1421 }
1422
1423 /* Make sure the new disk is big enough
1424 * (we may currently be R_PRIMARY with no local disk...) */
1425 if (drbd_get_max_capacity(nbc) <
1426 drbd_get_capacity(mdev->this_bdev)) {
67b58bf7 1427 retcode = ERR_DISK_TOO_SMALL;
e525fd89 1428 goto fail;
b411b363
PR		 1429 }
1430
1431 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1432
1352994b
LE		 1433 if (nbc->known_size > max_possible_sectors) {
1434 dev_warn(DEV, "==> truncating very big lower level device "
1435 "to currently maximum possible %llu sectors <==\n",
1436 (unsigned long long) max_possible_sectors);
daeda1cc 1437 if (new_disk_conf->meta_dev_idx >= 0)
1352994b
LE		 1438 dev_warn(DEV, "==>> using internal or flexible "
1439 "meta data may help <<==\n");
1440 }
1441
b411b363
PR		 1442 drbd_suspend_io(mdev);
1443 /* also wait for the last barrier ack. */
b6dd1a89
LE		 1444 /* FIXME see also https://daiquiri.linbit/cgi-bin/bugzilla/show_bug.cgi?id=171
1445 * We need a way to either ignore barrier acks for barriers sent before a device
1446 * was attached, or a way to wait for all pending barrier acks to come in.
1447 * As barriers are counted per resource,
1448 * we'd need to suspend io on all devices of a resource.
1449 */
2aebfabb 1450 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || drbd_suspended(mdev));
b411b363 1451 /* and for any other previously queued work */
a21e9298 1452 drbd_flush_workqueue(mdev);
b411b363 1453
f2024e7c
AG		 1454 rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1455 retcode = rv; /* FIXME: Type mismatch. */
b411b363 1456 drbd_resume_io(mdev);
f2024e7c 1457 if (rv < SS_SUCCESS)
e525fd89 1458 goto fail;
b411b363
PR		 1459
1460 if (!get_ldev_if_state(mdev, D_ATTACHING))
1461 goto force_diskless;
1462
1463 drbd_md_set_sector_offsets(mdev, nbc);
1464
1465 if (!mdev->bitmap) {
1466 if (drbd_bm_init(mdev)) {
1467 retcode = ERR_NOMEM;
1468 goto force_diskless_dec;
1469 }
1470 }
1471
1472 retcode = drbd_md_read(mdev, nbc);
1473 if (retcode != NO_ERROR)
1474 goto force_diskless_dec;
1475
1476 if (mdev->state.conn < C_CONNECTED &&
1477 mdev->state.role == R_PRIMARY &&
1478 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1479 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1480 (unsigned long long)mdev->ed_uuid);
1481 retcode = ERR_DATA_NOT_CURRENT;
1482 goto force_diskless_dec;
1483 }
1484
1485 /* Since we are diskless, fix the activity log first... */
daeda1cc 1486 if (drbd_check_al_size(mdev, new_disk_conf)) {
b411b363
PR		 1487 retcode = ERR_NOMEM;
1488 goto force_diskless_dec;
1489 }
1490
1491 /* Prevent shrinking of consistent devices ! */
1492 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
daeda1cc 1493 drbd_new_dev_size(mdev, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
b411b363 1494 dev_warn(DEV, "refusing to truncate a consistent device\n");
67b58bf7 1495 retcode = ERR_DISK_TOO_SMALL;
b411b363
PR		 1496 goto force_diskless_dec;
1497 }
1498
b411b363
PR		 1499 /* Reset the "barriers don't work" bits here, then force meta data to
1500 * be written, to ensure we determine if barriers are supported. */
e544046a 1501 if (new_disk_conf->md_flushes)
a8a4e51e 1502 clear_bit(MD_NO_FUA, &mdev->flags);
e544046a
AG		 1503 else
1504 set_bit(MD_NO_FUA, &mdev->flags);
b411b363
PR		 1505
1506 /* Point of no return reached.
1507 * Devices and memory are no longer released by error cleanup below.
1508 * now mdev takes over responsibility, and the state engine should
1509 * clean it up somewhere. */
1510 D_ASSERT(mdev->ldev == NULL);
1511 mdev->ldev = nbc;
1512 mdev->resync = resync_lru;
9958c857 1513 mdev->rs_plan_s = new_plan;
b411b363
PR		 1514 nbc = NULL;
1515 resync_lru = NULL;
daeda1cc 1516 new_disk_conf = NULL;
9958c857 1517 new_plan = NULL;
b411b363 1518
4b0007c0 1519 drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
b411b363
PR		 1520
1521 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1522 set_bit(CRASHED_PRIMARY, &mdev->flags);
1523 else
1524 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1525
894c6a94 1526 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
d5d7ebd4 1527 !(mdev->state.role == R_PRIMARY && mdev->tconn->susp_nod))
b411b363 1528 set_bit(CRASHED_PRIMARY, &mdev->flags);
b411b363
PR		 1529
1530 mdev->send_cnt = 0;
1531 mdev->recv_cnt = 0;
1532 mdev->read_cnt = 0;
1533 mdev->writ_cnt = 0;
1534
99432fcc 1535 drbd_reconsider_max_bio_size(mdev);
b411b363
PR		 1536
1537 /* If I am currently not R_PRIMARY,
1538 * but meta data primary indicator is set,
1539 * I just now recover from a hard crash,
1540 * and have been R_PRIMARY before that crash.
1541 *
1542 * Now, if I had no connection before that crash
1543 * (have been degraded R_PRIMARY), chances are that
1544 * I won't find my peer now either.
1545 *
1546 * In that case, and _only_ in that case,
1547 * we use the degr-wfc-timeout instead of the default,
1548 * so we can automatically recover from a crash of a
1549 * degraded but active "cluster" after a certain timeout.
1550 */
1551 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1552 if (mdev->state.role != R_PRIMARY &&
1553 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1554 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1555 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1556
24c4830c 1557 dd = drbd_determine_dev_size(mdev, 0);
b411b363
PR		 1558 if (dd == dev_size_error) {
1559 retcode = ERR_NOMEM_BITMAP;
1560 goto force_diskless_dec;
1561 } else if (dd == grew)
1562 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1563
9a51ab1c
PR		 1564 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC) ||
1565 (test_bit(CRASHED_PRIMARY, &mdev->flags) &&
1566 drbd_md_test_flag(mdev->ldev, MDF_AL_DISABLED))) {
b411b363
PR		 1567 dev_info(DEV, "Assuming that all blocks are out of sync "
1568 "(aka FullSync)\n");
20ceb2b2
LE		 1569 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1570 "set_n_write from attaching", BM_LOCKED_MASK)) {
b411b363
PR		 1571 retcode = ERR_IO_MD_DISK;
1572 goto force_diskless_dec;
1573 }
1574 } else {
20ceb2b2 1575 if (drbd_bitmap_io(mdev, &drbd_bm_read,
22ab6a30 1576 "read from attaching", BM_LOCKED_MASK)) {
b411b363
PR		 1577 retcode = ERR_IO_MD_DISK;
1578 goto force_diskless_dec;
1579 }
1580 }
1581
0778286a
PR		 1582 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1583 drbd_suspend_al(mdev); /* IO is still suspended here... */
1584
87eeee41 1585 spin_lock_irq(&mdev->tconn->req_lock);
78bae59b
PR		 1586 os = drbd_read_state(mdev);
1587 ns = os;
b411b363
PR		 1588 /* If MDF_CONSISTENT is not set go into inconsistent state,
1589 otherwise investigate MDF_WasUpToDate...
1590 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1591 otherwise into D_CONSISTENT state.
1592 */
1593 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1594 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1595 ns.disk = D_CONSISTENT;
1596 else
1597 ns.disk = D_OUTDATED;
1598 } else {
1599 ns.disk = D_INCONSISTENT;
1600 }
1601
1602 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1603 ns.pdsk = D_OUTDATED;
1604
daeda1cc
PR		 1605 rcu_read_lock();
1606 if (ns.disk == D_CONSISTENT &&
1607 (ns.pdsk == D_OUTDATED || rcu_dereference(mdev->ldev->disk_conf)->fencing == FP_DONT_CARE))
b411b363
PR		 1608 ns.disk = D_UP_TO_DATE;
1609
1610 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1611 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1612 this point, because drbd_request_state() modifies these
1613 flags. */
1614
9a51ab1c
PR		 1615 if (rcu_dereference(mdev->ldev->disk_conf)->al_updates)
1616 mdev->ldev->md.flags &= MDF_AL_DISABLED;
1617 else
1618 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1619
1620 rcu_read_unlock();
1621
b411b363
PR		 1622 /* In case we are C_CONNECTED postpone any decision on the new disk
1623 state after the negotiation phase. */
1624 if (mdev->state.conn == C_CONNECTED) {
1625 mdev->new_state_tmp.i = ns.i;
1626 ns.i = os.i;
1627 ns.disk = D_NEGOTIATING;
dc66c74d
PR		 1628
1629 /* We expect to receive up-to-date UUIDs soon.
1630 To avoid a race in receive_state, free p_uuid while
1631 holding req_lock. I.e. atomic with the state change */
1632 kfree(mdev->p_uuid);
1633 mdev->p_uuid = NULL;
b411b363
PR		 1634 }
1635
1636 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
87eeee41 1637 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363
PR		 1638
1639 if (rv < SS_SUCCESS)
1640 goto force_diskless_dec;
1641
cdfda633
PR		 1642 mod_timer(&mdev->request_timer, jiffies + HZ);
1643
b411b363
PR		 1644 if (mdev->state.role == R_PRIMARY)
1645 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1646 else
1647 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1648
1649 drbd_md_mark_dirty(mdev);
1650 drbd_md_sync(mdev);
1651
1652 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1653 put_ldev(mdev);
0e29d163 1654 conn_reconfig_done(mdev->tconn);
3b98c0c2 1655 drbd_adm_finish(info, retcode);
b411b363
PR		 1656 return 0;
1657
1658 force_diskless_dec:
1659 put_ldev(mdev);
1660 force_diskless:
9510b241 1661 drbd_force_state(mdev, NS(disk, D_DISKLESS));
b411b363 1662 drbd_md_sync(mdev);
b411b363 1663 fail:
40cbf085 1664 conn_reconfig_done(mdev->tconn);
b411b363 1665 if (nbc) {
e525fd89
TH		 1666 if (nbc->backing_bdev)
1667 blkdev_put(nbc->backing_bdev,
1668 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1669 if (nbc->md_bdev)
1670 blkdev_put(nbc->md_bdev,
1671 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
b411b363
PR		 1672 kfree(nbc);
1673 }
daeda1cc 1674 kfree(new_disk_conf);
b411b363 1675 lc_destroy(resync_lru);
9958c857 1676 kfree(new_plan);
b411b363 1677
40cbf085 1678 finish:
3b98c0c2 1679 drbd_adm_finish(info, retcode);
b411b363
PR		 1680 return 0;
1681}
1682
cdfda633 1683static int adm_detach(struct drbd_conf *mdev, int force)
85f75dd7 1684{
19f83c76 1685 enum drbd_state_rv retcode;
009ba89d 1686 int ret;
cdfda633
PR		 1687
1688 if (force) {
0c849666 1689 set_bit(FORCE_DETACH, &mdev->flags);
cdfda633
PR		 1690 drbd_force_state(mdev, NS(disk, D_FAILED));
1691 retcode = SS_SUCCESS;
1692 goto out;
1693 }
1694
85f75dd7 1695 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
0cfac5dd 1696 drbd_md_get_buffer(mdev); /* make sure there is no in-flight meta-data IO */
009ba89d 1697 retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
0cfac5dd 1698 drbd_md_put_buffer(mdev);
009ba89d
LE		 1699 /* D_FAILED will transition to DISKLESS. */
1700 ret = wait_event_interruptible(mdev->misc_wait,
1701 mdev->state.disk != D_FAILED);
85f75dd7 1702 drbd_resume_io(mdev);
009ba89d
LE		 1703 if ((int)retcode == (int)SS_IS_DISKLESS)
1704 retcode = SS_NOTHING_TO_DO;
1705 if (ret)
1706 retcode = ERR_INTR;
cdfda633 1707out:
85f75dd7
LE		 1708 return retcode;
1709}
1710
82f59cc6
LE		 1711/* Detaching the disk is a process in multiple stages. First we need to lock
1712 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1713 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1714 * internal references as well.
1715 * Only then we have finally detached. */
3b98c0c2 1716int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
b411b363 1717{
9a0d9d03 1718 enum drbd_ret_code retcode;
cdfda633
PR		 1719 struct detach_parms parms = { };
1720 int err;
3b98c0c2
LE		 1721
1722 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1723 if (!adm_ctx.reply_skb)
1724 return retcode;
1725 if (retcode != NO_ERROR)
1726 goto out;
1727
cdfda633
PR		 1728 if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
1729 err = detach_parms_from_attrs(&parms, info);
1730 if (err) {
1731 retcode = ERR_MANDATORY_TAG;
1732 drbd_msg_put_info(from_attrs_err_to_txt(err));
1733 goto out;
1734 }
1735 }
1736
1737 retcode = adm_detach(adm_ctx.mdev, parms.force_detach);
3b98c0c2
LE		 1738out:
1739 drbd_adm_finish(info, retcode);
b411b363
PR		 1740 return 0;
1741}
1742
f399002e
LE		 1743static bool conn_resync_running(struct drbd_tconn *tconn)
1744{
1745 struct drbd_conf *mdev;
695d08fa 1746 bool rv = false;
f399002e
LE		 1747 int vnr;
1748
695d08fa 1749 rcu_read_lock();
f399002e
LE		 1750 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1751 if (mdev->state.conn == C_SYNC_SOURCE ||
1752 mdev->state.conn == C_SYNC_TARGET ||
1753 mdev->state.conn == C_PAUSED_SYNC_S ||
695d08fa
PR		 1754 mdev->state.conn == C_PAUSED_SYNC_T) {
1755 rv = true;
1756 break;
1757 }
f399002e 1758 }
695d08fa
PR		 1759 rcu_read_unlock();
1760
1761 return rv;
f399002e
LE		 1762}
1763
1764static bool conn_ov_running(struct drbd_tconn *tconn)
1765{
1766 struct drbd_conf *mdev;
695d08fa 1767 bool rv = false;
f399002e
LE		 1768 int vnr;
1769
695d08fa 1770 rcu_read_lock();
f399002e
LE		 1771 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1772 if (mdev->state.conn == C_VERIFY_S ||
695d08fa
PR		 1773 mdev->state.conn == C_VERIFY_T) {
1774 rv = true;
1775 break;
1776 }
f399002e 1777 }
695d08fa
PR		 1778 rcu_read_unlock();
1779
1780 return rv;
f399002e
LE		 1781}
1782
cd64397c 1783static enum drbd_ret_code
44ed167d 1784_check_net_options(struct drbd_tconn *tconn, struct net_conf *old_conf, struct net_conf *new_conf)
cd64397c
PR		 1785{
1786 struct drbd_conf *mdev;
1787 int i;
1788
dcb20d1a
PR		 1789 if (old_conf && tconn->cstate == C_WF_REPORT_PARAMS && tconn->agreed_pro_version < 100) {
1790 if (new_conf->wire_protocol != old_conf->wire_protocol)
1791 return ERR_NEED_APV_100;
1792
1793 if (new_conf->two_primaries != old_conf->two_primaries)
1794 return ERR_NEED_APV_100;
1795
1796 if (!new_conf->integrity_alg != !old_conf->integrity_alg)
1797 return ERR_NEED_APV_100;
1798
1799 if (strcmp(new_conf->integrity_alg, old_conf->integrity_alg))
1800 return ERR_NEED_APV_100;
1801 }
1802
1803 if (!new_conf->two_primaries &&
1804 conn_highest_role(tconn) == R_PRIMARY &&
1805 conn_highest_peer(tconn) == R_PRIMARY)
1806 return ERR_NEED_ALLOW_TWO_PRI;
b032b6fa 1807
cd64397c
PR		 1808 if (new_conf->two_primaries &&
1809 (new_conf->wire_protocol != DRBD_PROT_C))
1810 return ERR_NOT_PROTO_C;
1811
cd64397c
PR		 1812 idr_for_each_entry(&tconn->volumes, mdev, i) {
1813 if (get_ldev(mdev)) {
daeda1cc 1814 enum drbd_fencing_p fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
cd64397c 1815 put_ldev(mdev);
44ed167d 1816 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
cd64397c 1817 return ERR_STONITH_AND_PROT_A;
cd64397c 1818 }
6139f60d 1819 if (mdev->state.role == R_PRIMARY && new_conf->discard_my_data)
eb12010e 1820 return ERR_DISCARD_IMPOSSIBLE;
cd64397c 1821 }
cd64397c
PR		 1822
1823 if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A)
1824 return ERR_CONG_NOT_PROTO_A;
1825
1826 return NO_ERROR;
1827}
1828
44ed167d
PR		 1829static enum drbd_ret_code
1830check_net_options(struct drbd_tconn *tconn, struct net_conf *new_conf)
1831{
1832 static enum drbd_ret_code rv;
1833 struct drbd_conf *mdev;
1834 int i;
1835
1836 rcu_read_lock();
1837 rv = _check_net_options(tconn, rcu_dereference(tconn->net_conf), new_conf);
1838 rcu_read_unlock();
1839
1840 /* tconn->volumes protected by genl_lock() here */
1841 idr_for_each_entry(&tconn->volumes, mdev, i) {
1842 if (!mdev->bitmap) {
1843 if(drbd_bm_init(mdev))
1844 return ERR_NOMEM;
1845 }
1846 }
1847
1848 return rv;
1849}
1850
0fd0ea06
PR		 1851struct crypto {
1852 struct crypto_hash *verify_tfm;
1853 struct crypto_hash *csums_tfm;
1854 struct crypto_hash *cram_hmac_tfm;
8d412fc6 1855 struct crypto_hash *integrity_tfm;
0fd0ea06
PR		 1856};
1857
1858static int
4b6ad6d4 1859alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
0fd0ea06
PR		 1860{
1861 if (!tfm_name[0])
1862 return NO_ERROR;
1863
1864 *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
1865 if (IS_ERR(*tfm)) {
1866 *tfm = NULL;
1867 return err_alg;
1868 }
1869
0fd0ea06
PR		 1870 return NO_ERROR;
1871}
1872
1873static enum drbd_ret_code
1874alloc_crypto(struct crypto *crypto, struct net_conf *new_conf)
1875{
1876 char hmac_name[CRYPTO_MAX_ALG_NAME];
1877 enum drbd_ret_code rv;
0fd0ea06 1878
4b6ad6d4
AG		 1879 rv = alloc_hash(&crypto->csums_tfm, new_conf->csums_alg,
1880 ERR_CSUMS_ALG);
0fd0ea06
PR		 1881 if (rv != NO_ERROR)
1882 return rv;
4b6ad6d4
AG		 1883 rv = alloc_hash(&crypto->verify_tfm, new_conf->verify_alg,
1884 ERR_VERIFY_ALG);
0fd0ea06
PR		 1885 if (rv != NO_ERROR)
1886 return rv;
4b6ad6d4
AG		 1887 rv = alloc_hash(&crypto->integrity_tfm, new_conf->integrity_alg,
1888 ERR_INTEGRITY_ALG);
0fd0ea06
PR		 1889 if (rv != NO_ERROR)
1890 return rv;
0fd0ea06
PR		 1891 if (new_conf->cram_hmac_alg[0] != 0) {
1892 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1893 new_conf->cram_hmac_alg);
1894
4b6ad6d4
AG		 1895 rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
1896 ERR_AUTH_ALG);
0fd0ea06 1897 }
0fd0ea06
PR		 1898
1899 return rv;
1900}
1901
1902static void free_crypto(struct crypto *crypto)
1903{
0fd0ea06 1904 crypto_free_hash(crypto->cram_hmac_tfm);
8d412fc6 1905 crypto_free_hash(crypto->integrity_tfm);
0fd0ea06
PR		 1906 crypto_free_hash(crypto->csums_tfm);
1907 crypto_free_hash(crypto->verify_tfm);
1908}
1909
f399002e
LE		 1910int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
1911{
1912 enum drbd_ret_code retcode;
1913 struct drbd_tconn *tconn;
44ed167d 1914 struct net_conf *old_conf, *new_conf = NULL;
f399002e
LE		 1915 int err;
1916 int ovr; /* online verify running */
1917 int rsr; /* re-sync running */
0fd0ea06 1918 struct crypto crypto = { };
f399002e 1919
089c075d 1920 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
f399002e
LE		 1921 if (!adm_ctx.reply_skb)
1922 return retcode;
1923 if (retcode != NO_ERROR)
1924 goto out;
1925
1926 tconn = adm_ctx.tconn;
1927
1928 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1929 if (!new_conf) {
1930 retcode = ERR_NOMEM;
1931 goto out;
1932 }
1933
44ed167d
PR		 1934 conn_reconfig_start(tconn);
1935
88104ca4 1936 mutex_lock(&tconn->data.mutex);
a0095508 1937 mutex_lock(&tconn->conf_update);
91fd4dad 1938 old_conf = tconn->net_conf;
44ed167d
PR		 1939
1940 if (!old_conf) {
f399002e
LE		 1941 drbd_msg_put_info("net conf missing, try connect");
1942 retcode = ERR_INVALID_REQUEST;
91fd4dad 1943 goto fail;
f399002e
LE		 1944 }
1945
44ed167d 1946 *new_conf = *old_conf;
5979e361 1947 if (should_set_defaults(info))
b966b5dd 1948 set_net_conf_defaults(new_conf);
f399002e 1949
f399002e 1950 err = net_conf_from_attrs_for_change(new_conf, info);
c75b9b10 1951 if (err && err != -ENOMSG) {
f399002e
LE		 1952 retcode = ERR_MANDATORY_TAG;
1953 drbd_msg_put_info(from_attrs_err_to_txt(err));
1954 goto fail;
1955 }
1956
cd64397c
PR		 1957 retcode = check_net_options(tconn, new_conf);
1958 if (retcode != NO_ERROR)
1959 goto fail;
1960
f399002e
LE		 1961 /* re-sync running */
1962 rsr = conn_resync_running(tconn);
0fd0ea06 1963 if (rsr && strcmp(new_conf->csums_alg, old_conf->csums_alg)) {
f399002e 1964 retcode = ERR_CSUMS_RESYNC_RUNNING;
91fd4dad 1965 goto fail;
f399002e
LE		 1966 }
1967
f399002e
LE		 1968 /* online verify running */
1969 ovr = conn_ov_running(tconn);
0fd0ea06
PR		 1970 if (ovr && strcmp(new_conf->verify_alg, old_conf->verify_alg)) {
1971 retcode = ERR_VERIFY_RUNNING;
1972 goto fail;
f399002e
LE		 1973 }
1974
0fd0ea06
PR		 1975 retcode = alloc_crypto(&crypto, new_conf);
1976 if (retcode != NO_ERROR)
1977 goto fail;
f399002e 1978
44ed167d 1979 rcu_assign_pointer(tconn->net_conf, new_conf);
f399002e
LE		 1980
1981 if (!rsr) {
1982 crypto_free_hash(tconn->csums_tfm);
0fd0ea06
PR		 1983 tconn->csums_tfm = crypto.csums_tfm;
1984 crypto.csums_tfm = NULL;
f399002e
LE		 1985 }
1986 if (!ovr) {
1987 crypto_free_hash(tconn->verify_tfm);
0fd0ea06
PR		 1988 tconn->verify_tfm = crypto.verify_tfm;
1989 crypto.verify_tfm = NULL;
f399002e
LE		 1990 }
1991
8d412fc6
AG		 1992 crypto_free_hash(tconn->integrity_tfm);
1993 tconn->integrity_tfm = crypto.integrity_tfm;
d659f2aa 1994 if (tconn->cstate >= C_WF_REPORT_PARAMS && tconn->agreed_pro_version >= 100)
88104ca4 1995 /* Do this without trying to take tconn->data.mutex again. */
d659f2aa 1996 __drbd_send_protocol(tconn, P_PROTOCOL_UPDATE);
0fd0ea06 1997
0fd0ea06
PR		 1998 crypto_free_hash(tconn->cram_hmac_tfm);
1999 tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2000
a0095508 2001 mutex_unlock(&tconn->conf_update);
88104ca4 2002 mutex_unlock(&tconn->data.mutex);
91fd4dad
PR		 2003 synchronize_rcu();
2004 kfree(old_conf);
2005
f399002e
LE		 2006 if (tconn->cstate >= C_WF_REPORT_PARAMS)
2007 drbd_send_sync_param(minor_to_mdev(conn_lowest_minor(tconn)));
2008
91fd4dad
PR		 2009 goto done;
2010
f399002e 2011 fail:
a0095508 2012 mutex_unlock(&tconn->conf_update);
88104ca4 2013 mutex_unlock(&tconn->data.mutex);
0fd0ea06 2014 free_crypto(&crypto);
f399002e 2015 kfree(new_conf);
91fd4dad 2016 done:
f399002e
LE		 2017 conn_reconfig_done(tconn);
2018 out:
2019 drbd_adm_finish(info, retcode);
2020 return 0;
2021}
2022
3b98c0c2 2023int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
b411b363 2024{
3b98c0c2 2025 struct drbd_conf *mdev;
44ed167d 2026 struct net_conf *old_conf, *new_conf = NULL;
0fd0ea06 2027 struct crypto crypto = { };
3b98c0c2 2028 struct drbd_tconn *tconn;
3b98c0c2
LE		 2029 enum drbd_ret_code retcode;
2030 int i;
2031 int err;
b411b363 2032
44e52cfa 2033 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
089c075d 2034
3b98c0c2
LE		 2035 if (!adm_ctx.reply_skb)
2036 return retcode;
2037 if (retcode != NO_ERROR)
2038 goto out;
089c075d
AG		 2039 if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
2040 drbd_msg_put_info("connection endpoint(s) missing");
2041 retcode = ERR_INVALID_REQUEST;
2042 goto out;
2043 }
2044
2045 /* No need for _rcu here. All reconfiguration is
2046 * strictly serialized on genl_lock(). We are protected against
2047 * concurrent reconfiguration/addition/deletion */
2048 list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
2049 if (nla_len(adm_ctx.my_addr) == tconn->my_addr_len &&
2050 !memcmp(nla_data(adm_ctx.my_addr), &tconn->my_addr, tconn->my_addr_len)) {
2051 retcode = ERR_LOCAL_ADDR;
2052 goto out;
2053 }
2054
2055 if (nla_len(adm_ctx.peer_addr) == tconn->peer_addr_len &&
2056 !memcmp(nla_data(adm_ctx.peer_addr), &tconn->peer_addr, tconn->peer_addr_len)) {
2057 retcode = ERR_PEER_ADDR;
2058 goto out;
2059 }
2060 }
3b98c0c2
LE		 2061
2062 tconn = adm_ctx.tconn;
80883197 2063 conn_reconfig_start(tconn);
b411b363 2064
80883197 2065 if (tconn->cstate > C_STANDALONE) {
b411b363
PR		 2066 retcode = ERR_NET_CONFIGURED;
2067 goto fail;
2068 }
2069
a209b4ae 2070 /* allocation not in the IO path, drbdsetup / netlink process context */
5979e361 2071 new_conf = kzalloc(sizeof(*new_conf), GFP_KERNEL);
b411b363
PR		 2072 if (!new_conf) {
2073 retcode = ERR_NOMEM;
2074 goto fail;
2075 }
2076
b966b5dd 2077 set_net_conf_defaults(new_conf);
f399002e
LE		 2078
2079 err = net_conf_from_attrs(new_conf, info);
25e40932 2080 if (err && err != -ENOMSG) {
b411b363 2081 retcode = ERR_MANDATORY_TAG;
3b98c0c2 2082 drbd_msg_put_info(from_attrs_err_to_txt(err));
b411b363
PR		 2083 goto fail;
2084 }
2085
cd64397c
PR		 2086 retcode = check_net_options(tconn, new_conf);
2087 if (retcode != NO_ERROR)
422028b1 2088 goto fail;
422028b1 2089
0fd0ea06
PR		 2090 retcode = alloc_crypto(&crypto, new_conf);
2091 if (retcode != NO_ERROR)
2092 goto fail;
b411b363 2093
b411b363
PR		 2094 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2095
80883197 2096 conn_flush_workqueue(tconn);
91fd4dad 2097
a0095508 2098 mutex_lock(&tconn->conf_update);
91fd4dad
PR		 2099 old_conf = tconn->net_conf;
2100 if (old_conf) {
b411b363 2101 retcode = ERR_NET_CONFIGURED;
a0095508 2102 mutex_unlock(&tconn->conf_update);
b411b363
PR		 2103 goto fail;
2104 }
44ed167d 2105 rcu_assign_pointer(tconn->net_conf, new_conf);
b411b363 2106
91fd4dad 2107 conn_free_crypto(tconn);
0fd0ea06 2108 tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
8d412fc6 2109 tconn->integrity_tfm = crypto.integrity_tfm;
0fd0ea06
PR		 2110 tconn->csums_tfm = crypto.csums_tfm;
2111 tconn->verify_tfm = crypto.verify_tfm;
b411b363 2112
089c075d
AG		 2113 tconn->my_addr_len = nla_len(adm_ctx.my_addr);
2114 memcpy(&tconn->my_addr, nla_data(adm_ctx.my_addr), tconn->my_addr_len);
2115 tconn->peer_addr_len = nla_len(adm_ctx.peer_addr);
2116 memcpy(&tconn->peer_addr, nla_data(adm_ctx.peer_addr), tconn->peer_addr_len);
2117
a0095508 2118 mutex_unlock(&tconn->conf_update);
91fd4dad 2119
695d08fa 2120 rcu_read_lock();
80883197
PR		 2121 idr_for_each_entry(&tconn->volumes, mdev, i) {
2122 mdev->send_cnt = 0;
2123 mdev->recv_cnt = 0;
80883197 2124 }
695d08fa 2125 rcu_read_unlock();
5ee743e9
LE		 2126
2127 retcode = conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2128
80883197 2129 conn_reconfig_done(tconn);
3b98c0c2 2130 drbd_adm_finish(info, retcode);
b411b363
PR		 2131 return 0;
2132
2133fail:
0fd0ea06 2134 free_crypto(&crypto);
b411b363
PR		 2135 kfree(new_conf);
2136
80883197 2137 conn_reconfig_done(tconn);
3b98c0c2
LE		 2138out:
2139 drbd_adm_finish(info, retcode);
b411b363
PR		 2140 return 0;
2141}
2142
85f75dd7
LE		 2143static enum drbd_state_rv conn_try_disconnect(struct drbd_tconn *tconn, bool force)
2144{
2145 enum drbd_state_rv rv;
85f75dd7 2146
f3dfa40a
LE		 2147 rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2148 force ? CS_HARD : 0);
85f75dd7
LE		 2149
2150 switch (rv) {
2151 case SS_NOTHING_TO_DO:
f3dfa40a 2152 break;
85f75dd7
LE		 2153 case SS_ALREADY_STANDALONE:
2154 return SS_SUCCESS;
2155 case SS_PRIMARY_NOP:
2156 /* Our state checking code wants to see the peer outdated. */
2157 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
f3dfa40a 2158 pdsk, D_OUTDATED), CS_VERBOSE);
85f75dd7
LE		 2159 break;
2160 case SS_CW_FAILED_BY_PEER:
2161 /* The peer probably wants to see us outdated. */
2162 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2163 disk, D_OUTDATED), 0);
2164 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
f3dfa40a
LE		 2165 rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2166 CS_HARD);
85f75dd7
LE		 2167 }
2168 break;
2169 default:;
2170 /* no special handling necessary */
2171 }
2172
f3dfa40a
LE		 2173 if (rv >= SS_SUCCESS) {
2174 enum drbd_state_rv rv2;
2175 /* No one else can reconfigure the network while I am here.
2176 * The state handling only uses drbd_thread_stop_nowait(),
2177 * we want to really wait here until the receiver is no more.
2178 */
2179 drbd_thread_stop(&adm_ctx.tconn->receiver);
2180
2181 /* Race breaker. This additional state change request may be
2182 * necessary, if this was a forced disconnect during a receiver
2183 * restart. We may have "killed" the receiver thread just
2184 * after drbdd_init() returned. Typically, we should be
2185 * C_STANDALONE already, now, and this becomes a no-op.
2186 */
2187 rv2 = conn_request_state(tconn, NS(conn, C_STANDALONE),
2188 CS_VERBOSE | CS_HARD);
2189 if (rv2 < SS_SUCCESS)
2190 conn_err(tconn,
2191 "unexpected rv2=%d in conn_try_disconnect()\n",
2192 rv2);
2193 }
85f75dd7
LE		 2194 return rv;
2195}
2196
3b98c0c2 2197int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
b411b363 2198{
3b98c0c2
LE		 2199 struct disconnect_parms parms;
2200 struct drbd_tconn *tconn;
85f75dd7 2201 enum drbd_state_rv rv;
3b98c0c2
LE		 2202 enum drbd_ret_code retcode;
2203 int err;
2561b9c1 2204
089c075d 2205 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
3b98c0c2
LE		 2206 if (!adm_ctx.reply_skb)
2207 return retcode;
2208 if (retcode != NO_ERROR)
2561b9c1 2209 goto fail;
3b98c0c2
LE		 2210
2211 tconn = adm_ctx.tconn;
2212 memset(&parms, 0, sizeof(parms));
2213 if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
f399002e 2214 err = disconnect_parms_from_attrs(&parms, info);
3b98c0c2
LE		 2215 if (err) {
2216 retcode = ERR_MANDATORY_TAG;
2217 drbd_msg_put_info(from_attrs_err_to_txt(err));
2218 goto fail;
2219 }
2561b9c1
PR		 2220 }
2221
85f75dd7
LE		 2222 rv = conn_try_disconnect(tconn, parms.force_disconnect);
2223 if (rv < SS_SUCCESS)
f3dfa40a
LE		 2224 retcode = rv; /* FIXME: Type mismatch. */
2225 else
2226 retcode = NO_ERROR;
b411b363 2227 fail:
3b98c0c2 2228 drbd_adm_finish(info, retcode);
b411b363
PR		 2229 return 0;
2230}
2231
2232void resync_after_online_grow(struct drbd_conf *mdev)
2233{
2234 int iass; /* I am sync source */
2235
2236 dev_info(DEV, "Resync of new storage after online grow\n");
2237 if (mdev->state.role != mdev->state.peer)
2238 iass = (mdev->state.role == R_PRIMARY);
2239 else
427c0434 2240 iass = test_bit(RESOLVE_CONFLICTS, &mdev->tconn->flags);
b411b363
PR		 2241
2242 if (iass)
2243 drbd_start_resync(mdev, C_SYNC_SOURCE);
2244 else
2245 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2246}
2247
3b98c0c2 2248int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
b411b363 2249{
daeda1cc 2250 struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
3b98c0c2
LE		 2251 struct resize_parms rs;
2252 struct drbd_conf *mdev;
2253 enum drbd_ret_code retcode;
b411b363 2254 enum determine_dev_size dd;
6495d2c6 2255 enum dds_flags ddsf;
daeda1cc 2256 sector_t u_size;
3b98c0c2 2257 int err;
b411b363 2258
3b98c0c2
LE		 2259 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2260 if (!adm_ctx.reply_skb)
2261 return retcode;
2262 if (retcode != NO_ERROR)
b411b363 2263 goto fail;
3b98c0c2
LE		 2264
2265 memset(&rs, 0, sizeof(struct resize_parms));
2266 if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
f399002e 2267 err = resize_parms_from_attrs(&rs, info);
3b98c0c2
LE		 2268 if (err) {
2269 retcode = ERR_MANDATORY_TAG;
2270 drbd_msg_put_info(from_attrs_err_to_txt(err));
2271 goto fail;
2272 }
b411b363
PR		 2273 }
2274
3b98c0c2 2275 mdev = adm_ctx.mdev;
b411b363
PR		 2276 if (mdev->state.conn > C_CONNECTED) {
2277 retcode = ERR_RESIZE_RESYNC;
2278 goto fail;
2279 }
2280
2281 if (mdev->state.role == R_SECONDARY &&
2282 mdev->state.peer == R_SECONDARY) {
2283 retcode = ERR_NO_PRIMARY;
2284 goto fail;
2285 }
2286
2287 if (!get_ldev(mdev)) {
2288 retcode = ERR_NO_DISK;
2289 goto fail;
2290 }
2291
31890f4a 2292 if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
6495d2c6 2293 retcode = ERR_NEED_APV_93;
9bcd2521 2294 goto fail_ldev;
6495d2c6
PR		 2295 }
2296
daeda1cc
PR		 2297 rcu_read_lock();
2298 u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
2299 rcu_read_unlock();
2300 if (u_size != (sector_t)rs.resize_size) {
2301 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2302 if (!new_disk_conf) {
2303 retcode = ERR_NOMEM;
9bcd2521 2304 goto fail_ldev;
daeda1cc
PR		 2305 }
2306 }
2307
087c2492 2308 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
b411b363 2309 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
b411b363 2310
daeda1cc
PR		 2311 if (new_disk_conf) {
2312 mutex_lock(&mdev->tconn->conf_update);
2313 old_disk_conf = mdev->ldev->disk_conf;
2314 *new_disk_conf = *old_disk_conf;
2315 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2316 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
2317 mutex_unlock(&mdev->tconn->conf_update);
2318 synchronize_rcu();
2319 kfree(old_disk_conf);
2320 }
2321
6495d2c6 2322 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
24c4830c 2323 dd = drbd_determine_dev_size(mdev, ddsf);
b411b363
PR		 2324 drbd_md_sync(mdev);
2325 put_ldev(mdev);
2326 if (dd == dev_size_error) {
2327 retcode = ERR_NOMEM_BITMAP;
2328 goto fail;
2329 }
2330
087c2492 2331 if (mdev->state.conn == C_CONNECTED) {
b411b363
PR		 2332 if (dd == grew)
2333 set_bit(RESIZE_PENDING, &mdev->flags);
2334
2335 drbd_send_uuids(mdev);
6495d2c6 2336 drbd_send_sizes(mdev, 1, ddsf);
b411b363
PR		 2337 }
2338
2339 fail:
3b98c0c2 2340 drbd_adm_finish(info, retcode);
b411b363 2341 return 0;
9bcd2521
PR		 2342
2343 fail_ldev:
2344 put_ldev(mdev);
2345 goto fail;
b411b363
PR		 2346}
2347
f399002e 2348int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
b411b363 2349{
3b98c0c2 2350 enum drbd_ret_code retcode;
f399002e 2351 struct drbd_tconn *tconn;
b57a1e27 2352 struct res_opts res_opts;
f399002e 2353 int err;
b411b363 2354
44e52cfa 2355 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3b98c0c2
LE		 2356 if (!adm_ctx.reply_skb)
2357 return retcode;
2358 if (retcode != NO_ERROR)
2359 goto fail;
f399002e 2360 tconn = adm_ctx.tconn;
3b98c0c2 2361
b57a1e27 2362 res_opts = tconn->res_opts;
5979e361 2363 if (should_set_defaults(info))
b966b5dd 2364 set_res_opts_defaults(&res_opts);
b411b363 2365
b57a1e27 2366 err = res_opts_from_attrs(&res_opts, info);
c75b9b10 2367 if (err && err != -ENOMSG) {
b411b363 2368 retcode = ERR_MANDATORY_TAG;
3b98c0c2 2369 drbd_msg_put_info(from_attrs_err_to_txt(err));
b411b363
PR		 2370 goto fail;
2371 }
2372
afbbfa88
AG		 2373 err = set_resource_options(tconn, &res_opts);
2374 if (err) {
2375 retcode = ERR_INVALID_REQUEST;
2376 if (err == -ENOMEM)
2377 retcode = ERR_NOMEM;
b411b363
PR		 2378 }
2379
b411b363 2380fail:
3b98c0c2 2381 drbd_adm_finish(info, retcode);
b411b363
PR		 2382 return 0;
2383}
2384
3b98c0c2 2385int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
b411b363 2386{
3b98c0c2
LE		 2387 struct drbd_conf *mdev;
2388 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2389
2390 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2391 if (!adm_ctx.reply_skb)
2392 return retcode;
2393 if (retcode != NO_ERROR)
2394 goto out;
2395
2396 mdev = adm_ctx.mdev;
b411b363 2397
194bfb32 2398 /* If there is still bitmap IO pending, probably because of a previous
970fbde1
LE		 2399 * resync just being finished, wait for it before requesting a new resync.
2400 * Also wait for it's after_state_ch(). */
5016b82a 2401 drbd_suspend_io(mdev);
194bfb32 2402 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
970fbde1 2403 drbd_flush_workqueue(mdev);
194bfb32 2404
b411b363
PR		 2405 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
2406
2407 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
2408 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2409
2410 while (retcode == SS_NEED_CONNECTION) {
87eeee41 2411 spin_lock_irq(&mdev->tconn->req_lock);
b411b363
PR		 2412 if (mdev->state.conn < C_CONNECTED)
2413 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
87eeee41 2414 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363
PR		 2415
2416 if (retcode != SS_NEED_CONNECTION)
2417 break;
2418
2419 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2420 }
5016b82a 2421 drbd_resume_io(mdev);
b411b363 2422
3b98c0c2
LE		 2423out:
2424 drbd_adm_finish(info, retcode);
b411b363
PR		 2425 return 0;
2426}
2427
3b98c0c2
LE		 2428static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2429 union drbd_state mask, union drbd_state val)
b411b363 2430{
3b98c0c2 2431 enum drbd_ret_code retcode;
194bfb32 2432
3b98c0c2
LE		 2433 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2434 if (!adm_ctx.reply_skb)
2435 return retcode;
2436 if (retcode != NO_ERROR)
2437 goto out;
b411b363 2438
3b98c0c2
LE		 2439 retcode = drbd_request_state(adm_ctx.mdev, mask, val);
2440out:
2441 drbd_adm_finish(info, retcode);
b411b363
PR		 2442 return 0;
2443}
2444
25b0d6c8
PR		 2445static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
2446{
2447 int rv;
2448
2449 rv = drbd_bmio_set_n_write(mdev);
2450 drbd_suspend_al(mdev);
2451 return rv;
2452}
2453
3b98c0c2 2454int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
b411b363 2455{
25b0d6c8
PR		 2456 int retcode; /* drbd_ret_code, drbd_state_rv */
2457 struct drbd_conf *mdev;
2458
2459 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2460 if (!adm_ctx.reply_skb)
2461 return retcode;
2462 if (retcode != NO_ERROR)
2463 goto out;
2464
2465 mdev = adm_ctx.mdev;
2466
5016b82a 2467 /* If there is still bitmap IO pending, probably because of a previous
970fbde1
LE		 2468 * resync just being finished, wait for it before requesting a new resync.
2469 * Also wait for it's after_state_ch(). */
5016b82a
LE		 2470 drbd_suspend_io(mdev);
2471 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
970fbde1 2472 drbd_flush_workqueue(mdev);
5016b82a 2473
25b0d6c8
PR		 2474 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
2475 if (retcode < SS_SUCCESS) {
2476 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
2477 /* The peer will get a resync upon connect anyways.
2478 * Just make that into a full resync. */
2479 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
2480 if (retcode >= SS_SUCCESS) {
2481 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
2482 "set_n_write from invalidate_peer",
2483 BM_LOCKED_SET_ALLOWED))
2484 retcode = ERR_IO_MD_DISK;
2485 }
2486 } else
2487 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
2488 }
5016b82a 2489 drbd_resume_io(mdev);
25b0d6c8
PR		 2490
2491out:
2492 drbd_adm_finish(info, retcode);
2493 return 0;
3b98c0c2 2494}
b411b363 2495
3b98c0c2
LE		 2496int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2497{
2498 enum drbd_ret_code retcode;
2499
2500 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2501 if (!adm_ctx.reply_skb)
2502 return retcode;
2503 if (retcode != NO_ERROR)
2504 goto out;
b411b363 2505
3b98c0c2
LE		 2506 if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2507 retcode = ERR_PAUSE_IS_SET;
2508out:
2509 drbd_adm_finish(info, retcode);
b411b363
PR		 2510 return 0;
2511}
2512
3b98c0c2 2513int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
b411b363 2514{
da9fbc27 2515 union drbd_dev_state s;
3b98c0c2
LE		 2516 enum drbd_ret_code retcode;
2517
2518 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2519 if (!adm_ctx.reply_skb)
2520 return retcode;
2521 if (retcode != NO_ERROR)
2522 goto out;
b411b363 2523
3b98c0c2
LE		 2524 if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2525 s = adm_ctx.mdev->state;
cd88d030
PR		 2526 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2527 retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2528 s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2529 } else {
2530 retcode = ERR_PAUSE_IS_CLEAR;
2531 }
2532 }
b411b363 2533
3b98c0c2
LE		 2534out:
2535 drbd_adm_finish(info, retcode);
b411b363
PR		 2536 return 0;
2537}
2538
3b98c0c2 2539int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
b411b363 2540{
3b98c0c2 2541 return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
b411b363
PR		 2542}
2543
3b98c0c2 2544int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
b411b363 2545{
3b98c0c2
LE		 2546 struct drbd_conf *mdev;
2547 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2548
2549 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2550 if (!adm_ctx.reply_skb)
2551 return retcode;
2552 if (retcode != NO_ERROR)
2553 goto out;
2554
2555 mdev = adm_ctx.mdev;
43a5182c
PR		 2556 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2557 drbd_uuid_new_current(mdev);
2558 clear_bit(NEW_CUR_UUID, &mdev->flags);
43a5182c 2559 }
265be2d0 2560 drbd_suspend_io(mdev);
3b98c0c2
LE		 2561 retcode = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2562 if (retcode == SS_SUCCESS) {
265be2d0 2563 if (mdev->state.conn < C_CONNECTED)
2f5cdd0b 2564 tl_clear(mdev->tconn);
265be2d0 2565 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2f5cdd0b 2566 tl_restart(mdev->tconn, FAIL_FROZEN_DISK_IO);
265be2d0
PR		 2567 }
2568 drbd_resume_io(mdev);
2569
3b98c0c2
LE		 2570out:
2571 drbd_adm_finish(info, retcode);
b411b363
PR		 2572 return 0;
2573}
2574
3b98c0c2 2575int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
b411b363 2576{
3b98c0c2 2577 return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
b411b363
PR		 2578}
2579
089c075d 2580int nla_put_drbd_cfg_context(struct sk_buff *skb, struct drbd_tconn *tconn, unsigned vnr)
543cc10b
LE		 2581{
2582 struct nlattr *nla;
2583 nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2584 if (!nla)
2585 goto nla_put_failure;
26ec9287
AG		 2586 if (vnr != VOLUME_UNSPECIFIED &&
2587 nla_put_u32(skb, T_ctx_volume, vnr))
2588 goto nla_put_failure;
2589 if (nla_put_string(skb, T_ctx_resource_name, tconn->name))
2590 goto nla_put_failure;
2591 if (tconn->my_addr_len &&
2592 nla_put(skb, T_ctx_my_addr, tconn->my_addr_len, &tconn->my_addr))
2593 goto nla_put_failure;
2594 if (tconn->peer_addr_len &&
2595 nla_put(skb, T_ctx_peer_addr, tconn->peer_addr_len, &tconn->peer_addr))
2596 goto nla_put_failure;
543cc10b
LE		 2597 nla_nest_end(skb, nla);
2598 return 0;
2599
2600nla_put_failure:
2601 if (nla)
2602 nla_nest_cancel(skb, nla);
2603 return -EMSGSIZE;
2604}
2605
3b98c0c2
LE		 2606int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
2607 const struct sib_info *sib)
b411b363 2608{
3b98c0c2 2609 struct state_info *si = NULL; /* for sizeof(si->member); */
44ed167d 2610 struct net_conf *nc;
3b98c0c2
LE		 2611 struct nlattr *nla;
2612 int got_ldev;
3b98c0c2
LE		 2613 int err = 0;
2614 int exclude_sensitive;
2615
2616 /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2617 * to. So we better exclude_sensitive information.
2618 *
2619 * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2620 * in the context of the requesting user process. Exclude sensitive
2621 * information, unless current has superuser.
2622 *
2623 * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2624 * relies on the current implementation of netlink_dump(), which
2625 * executes the dump callback successively from netlink_recvmsg(),
2626 * always in the context of the receiving process */
2627 exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2628
2629 got_ldev = get_ldev(mdev);
3b98c0c2
LE		 2630
2631 /* We need to add connection name and volume number information still.
2632 * Minor number is in drbd_genlmsghdr. */
089c075d 2633 if (nla_put_drbd_cfg_context(skb, mdev->tconn, mdev->vnr))
3b98c0c2 2634 goto nla_put_failure;
3b98c0c2 2635
f399002e
LE		 2636 if (res_opts_to_skb(skb, &mdev->tconn->res_opts, exclude_sensitive))
2637 goto nla_put_failure;
2638
daeda1cc 2639 rcu_read_lock();
3b98c0c2 2640 if (got_ldev)
daeda1cc 2641 if (disk_conf_to_skb(skb, rcu_dereference(mdev->ldev->disk_conf), exclude_sensitive))
3b98c0c2 2642 goto nla_put_failure;
44ed167d 2643
44ed167d
PR		 2644 nc = rcu_dereference(mdev->tconn->net_conf);
2645 if (nc)
2646 err = net_conf_to_skb(skb, nc, exclude_sensitive);
2647 rcu_read_unlock();
2648 if (err)
2649 goto nla_put_failure;
3b98c0c2 2650
3b98c0c2
LE		 2651 nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2652 if (!nla)
2653 goto nla_put_failure;
26ec9287
AG		 2654 if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
2655 nla_put_u32(skb, T_current_state, mdev->state.i) ||
2656 nla_put_u64(skb, T_ed_uuid, mdev->ed_uuid) ||
3174f8c5
PM		 2657 nla_put_u64(skb, T_capacity, drbd_get_capacity(mdev->this_bdev)) ||
2658 nla_put_u64(skb, T_send_cnt, mdev->send_cnt) ||
2659 nla_put_u64(skb, T_recv_cnt, mdev->recv_cnt) ||
2660 nla_put_u64(skb, T_read_cnt, mdev->read_cnt) ||
2661 nla_put_u64(skb, T_writ_cnt, mdev->writ_cnt) ||
2662 nla_put_u64(skb, T_al_writ_cnt, mdev->al_writ_cnt) ||
2663 nla_put_u64(skb, T_bm_writ_cnt, mdev->bm_writ_cnt) ||
2664 nla_put_u32(skb, T_ap_bio_cnt, atomic_read(&mdev->ap_bio_cnt)) ||
2665 nla_put_u32(skb, T_ap_pending_cnt, atomic_read(&mdev->ap_pending_cnt)) ||
2666 nla_put_u32(skb, T_rs_pending_cnt, atomic_read(&mdev->rs_pending_cnt)))
26ec9287 2667 goto nla_put_failure;
3b98c0c2
LE		 2668
2669 if (got_ldev) {
39a1aa7f
PR		 2670 int err;
2671
2672 spin_lock_irq(&mdev->ldev->md.uuid_lock);
2673 err = nla_put(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid);
2674 spin_unlock_irq(&mdev->ldev->md.uuid_lock);
2675
2676 if (err)
2677 goto nla_put_failure;
2678
26ec9287 2679 if (nla_put_u32(skb, T_disk_flags, mdev->ldev->md.flags) ||
26ec9287
AG		 2680 nla_put_u64(skb, T_bits_total, drbd_bm_bits(mdev)) ||
2681 nla_put_u64(skb, T_bits_oos, drbd_bm_total_weight(mdev)))
2682 goto nla_put_failure;
3b98c0c2
LE		 2683 if (C_SYNC_SOURCE <= mdev->state.conn &&
2684 C_PAUSED_SYNC_T >= mdev->state.conn) {
26ec9287
AG		 2685 if (nla_put_u64(skb, T_bits_rs_total, mdev->rs_total) ||
2686 nla_put_u64(skb, T_bits_rs_failed, mdev->rs_failed))
2687 goto nla_put_failure;
3b98c0c2 2688 }
b411b363
PR		 2689 }
2690
3b98c0c2
LE		 2691 if (sib) {
2692 switch(sib->sib_reason) {
2693 case SIB_SYNC_PROGRESS:
2694 case SIB_GET_STATUS_REPLY:
2695 break;
2696 case SIB_STATE_CHANGE:
26ec9287
AG		 2697 if (nla_put_u32(skb, T_prev_state, sib->os.i) ||
2698 nla_put_u32(skb, T_new_state, sib->ns.i))
2699 goto nla_put_failure;
3b98c0c2
LE		 2700 break;
2701 case SIB_HELPER_POST:
26ec9287
AG		 2702 if (nla_put_u32(skb, T_helper_exit_code,
2703 sib->helper_exit_code))
2704 goto nla_put_failure;
3b98c0c2
LE		 2705 /* fall through */
2706 case SIB_HELPER_PRE:
26ec9287
AG		 2707 if (nla_put_string(skb, T_helper, sib->helper_name))
2708 goto nla_put_failure;
3b98c0c2
LE		 2709 break;
2710 }
b411b363 2711 }
3b98c0c2 2712 nla_nest_end(skb, nla);
b411b363 2713
3b98c0c2
LE		 2714 if (0)
2715nla_put_failure:
2716 err = -EMSGSIZE;
2717 if (got_ldev)
2718 put_ldev(mdev);
3b98c0c2 2719 return err;
b411b363
PR		 2720}
2721
3b98c0c2 2722int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
b411b363 2723{
3b98c0c2
LE		 2724 enum drbd_ret_code retcode;
2725 int err;
b411b363 2726
3b98c0c2
LE		 2727 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2728 if (!adm_ctx.reply_skb)
2729 return retcode;
2730 if (retcode != NO_ERROR)
2731 goto out;
b411b363 2732
3b98c0c2
LE		 2733 err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.mdev, NULL);
2734 if (err) {
2735 nlmsg_free(adm_ctx.reply_skb);
2736 return err;
b411b363 2737 }
3b98c0c2
LE		 2738out:
2739 drbd_adm_finish(info, retcode);
2740 return 0;
b411b363
PR		 2741}
2742
71932efc 2743int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
b411b363 2744{
3b98c0c2
LE		 2745 struct drbd_conf *mdev;
2746 struct drbd_genlmsghdr *dh;
543cc10b
LE		 2747 struct drbd_tconn *pos = (struct drbd_tconn*)cb->args[0];
2748 struct drbd_tconn *tconn = NULL;
2749 struct drbd_tconn *tmp;
2750 unsigned volume = cb->args[1];
2751
2752 /* Open coded, deferred, iteration:
2753 * list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
2754 * idr_for_each_entry(&tconn->volumes, mdev, i) {
2755 * ...
2756 * }
2757 * }
2758 * where tconn is cb->args[0];
2759 * and i is cb->args[1];
2760 *
71932efc
LE		 2761 * cb->args[2] indicates if we shall loop over all resources,
2762 * or just dump all volumes of a single resource.
2763 *
3b98c0c2
LE		 2764 * This may miss entries inserted after this dump started,
2765 * or entries deleted before they are reached.
543cc10b
LE		 2766 *
2767 * We need to make sure the mdev won't disappear while
2768 * we are looking at it, and revalidate our iterators
2769 * on each iteration.
2770 */
3b98c0c2 2771
9dc9fbb3 2772 /* synchronize with conn_create()/conn_destroy() */
c141ebda 2773 rcu_read_lock();
543cc10b 2774 /* revalidate iterator position */
ec0bddbc 2775 list_for_each_entry_rcu(tmp, &drbd_tconns, all_tconn) {
543cc10b
LE		 2776 if (pos == NULL) {
2777 /* first iteration */
2778 pos = tmp;
2779 tconn = pos;
2780 break;
2781 }
2782 if (tmp == pos) {
2783 tconn = pos;
2784 break;
2785 }
2786 }
2787 if (tconn) {
71932efc 2788next_tconn:
543cc10b
LE		 2789 mdev = idr_get_next(&tconn->volumes, &volume);
2790 if (!mdev) {
2791 /* No more volumes to dump on this tconn.
2792 * Advance tconn iterator. */
ec0bddbc
PR		 2793 pos = list_entry_rcu(tconn->all_tconn.next,
2794 struct drbd_tconn, all_tconn);
71932efc 2795 /* Did we dump any volume on this tconn yet? */
543cc10b 2796 if (volume != 0) {
71932efc
LE		 2797 /* If we reached the end of the list,
2798 * or only a single resource dump was requested,
2799 * we are done. */
2800 if (&pos->all_tconn == &drbd_tconns || cb->args[2])
2801 goto out;
543cc10b 2802 volume = 0;
71932efc 2803 tconn = pos;
543cc10b
LE		 2804 goto next_tconn;
2805 }
2806 }
2807
3b98c0c2
LE		 2808 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).pid,
2809 cb->nlh->nlmsg_seq, &drbd_genl_family,
2810 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
2811 if (!dh)
543cc10b
LE		 2812 goto out;
2813
2814 if (!mdev) {
367d675d
LE		 2815 /* This is a tconn without a single volume.
2816 * Suprisingly enough, it may have a network
2817 * configuration. */
2818 struct net_conf *nc;
543cc10b
LE		 2819 dh->minor = -1U;
2820 dh->ret_code = NO_ERROR;
089c075d 2821 if (nla_put_drbd_cfg_context(skb, tconn, VOLUME_UNSPECIFIED))
367d675d
LE		 2822 goto cancel;
2823 nc = rcu_dereference(tconn->net_conf);
2824 if (nc && net_conf_to_skb(skb, nc, 1) != 0)
2825 goto cancel;
2826 goto done;
543cc10b 2827 }
3b98c0c2 2828
543cc10b
LE		 2829 D_ASSERT(mdev->vnr == volume);
2830 D_ASSERT(mdev->tconn == tconn);
3b98c0c2 2831
543cc10b 2832 dh->minor = mdev_to_minor(mdev);
3b98c0c2
LE		 2833 dh->ret_code = NO_ERROR;
2834
2835 if (nla_put_status_info(skb, mdev, NULL)) {
367d675d 2836cancel:
3b98c0c2 2837 genlmsg_cancel(skb, dh);
543cc10b 2838 goto out;
3b98c0c2 2839 }
367d675d 2840done:
3b98c0c2
LE		 2841 genlmsg_end(skb, dh);
2842 }
b411b363 2843
543cc10b 2844out:
c141ebda 2845 rcu_read_unlock();
543cc10b
LE		 2846 /* where to start the next iteration */
2847 cb->args[0] = (long)pos;
2848 cb->args[1] = (pos == tconn) ? volume + 1 : 0;
b411b363 2849
543cc10b
LE		 2850 /* No more tconns/volumes/minors found results in an empty skb.
2851 * Which will terminate the dump. */
3b98c0c2 2852 return skb->len;
b411b363
PR		 2853}
2854
71932efc
LE		 2855/*
2856 * Request status of all resources, or of all volumes within a single resource.
2857 *
2858 * This is a dump, as the answer may not fit in a single reply skb otherwise.
2859 * Which means we cannot use the family->attrbuf or other such members, because
2860 * dump is NOT protected by the genl_lock(). During dump, we only have access
2861 * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
2862 *
2863 * Once things are setup properly, we call into get_one_status().
2864 */
2865int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
2866{
2867 const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
2868 struct nlattr *nla;
7c3063cc 2869 const char *resource_name;
71932efc 2870 struct drbd_tconn *tconn;
7c3063cc 2871 int maxtype;
71932efc
LE		 2872
2873 /* Is this a followup call? */
2874 if (cb->args[0]) {
2875 /* ... of a single resource dump,
2876 * and the resource iterator has been advanced already? */
2877 if (cb->args[2] && cb->args[2] != cb->args[0])
2878 return 0; /* DONE. */
2879 goto dump;
2880 }
2881
2882 /* First call (from netlink_dump_start). We need to figure out
2883 * which resource(s) the user wants us to dump. */
2884 nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
2885 nlmsg_attrlen(cb->nlh, hdrlen),
2886 DRBD_NLA_CFG_CONTEXT);
2887
2888 /* No explicit context given. Dump all. */
2889 if (!nla)
2890 goto dump;
7c3063cc
AG		 2891 maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
2892 nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
2893 if (IS_ERR(nla))
2894 return PTR_ERR(nla);
71932efc
LE		 2895 /* context given, but no name present? */
2896 if (!nla)
2897 return -EINVAL;
7c3063cc
AG		 2898 resource_name = nla_data(nla);
2899 tconn = conn_get_by_name(resource_name);
0ace9dfa 2900
71932efc
LE		 2901 if (!tconn)
2902 return -ENODEV;
2903
0ace9dfa
PR		 2904 kref_put(&tconn->kref, &conn_destroy); /* get_one_status() (re)validates tconn by itself */
2905
71932efc
LE		 2906 /* prime iterators, and set "filter" mode mark:
2907 * only dump this tconn. */
2908 cb->args[0] = (long)tconn;
2909 /* cb->args[1] = 0; passed in this way. */
2910 cb->args[2] = (long)tconn;
2911
2912dump:
2913 return get_one_status(skb, cb);
2914}
2915
3b98c0c2 2916int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
b411b363 2917{
3b98c0c2
LE		 2918 enum drbd_ret_code retcode;
2919 struct timeout_parms tp;
2920 int err;
b411b363 2921
3b98c0c2
LE		 2922 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2923 if (!adm_ctx.reply_skb)
2924 return retcode;
2925 if (retcode != NO_ERROR)
2926 goto out;
b411b363 2927
3b98c0c2
LE		 2928 tp.timeout_type =
2929 adm_ctx.mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2930 test_bit(USE_DEGR_WFC_T, &adm_ctx.mdev->flags) ? UT_DEGRADED :
2931 UT_DEFAULT;
b411b363 2932
3b98c0c2
LE		 2933 err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
2934 if (err) {
2935 nlmsg_free(adm_ctx.reply_skb);
2936 return err;
2937 }
2938out:
2939 drbd_adm_finish(info, retcode);
2940 return 0;
b411b363
PR		 2941}
2942
3b98c0c2 2943int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
b411b363 2944{
3b98c0c2
LE		 2945 struct drbd_conf *mdev;
2946 enum drbd_ret_code retcode;
58ffa580 2947 struct start_ov_parms parms;
b411b363 2948
3b98c0c2
LE		 2949 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2950 if (!adm_ctx.reply_skb)
2951 return retcode;
2952 if (retcode != NO_ERROR)
2953 goto out;
873b0d5f 2954
3b98c0c2 2955 mdev = adm_ctx.mdev;
58ffa580
LE		 2956
2957 /* resume from last known position, if possible */
2958 parms.ov_start_sector = mdev->ov_start_sector;
2959 parms.ov_stop_sector = ULLONG_MAX;
3b98c0c2 2960 if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
f399002e 2961 int err = start_ov_parms_from_attrs(&parms, info);
3b98c0c2
LE		 2962 if (err) {
2963 retcode = ERR_MANDATORY_TAG;
2964 drbd_msg_put_info(from_attrs_err_to_txt(err));
2965 goto out;
2966 }
3b98c0c2 2967 }
58ffa580
LE		 2968 /* w_make_ov_request expects position to be aligned */
2969 mdev->ov_start_sector = parms.ov_start_sector & ~(BM_SECT_PER_BIT-1);
2970 mdev->ov_stop_sector = parms.ov_stop_sector;
2971
873b0d5f
LE		 2972 /* If there is still bitmap IO pending, e.g. previous resync or verify
2973 * just being finished, wait for it before requesting a new resync. */
5016b82a 2974 drbd_suspend_io(mdev);
873b0d5f 2975 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
3b98c0c2 2976 retcode = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
5016b82a 2977 drbd_resume_io(mdev);
3b98c0c2
LE		 2978out:
2979 drbd_adm_finish(info, retcode);
b411b363
PR		 2980 return 0;
2981}
2982
2983
3b98c0c2 2984int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
b411b363 2985{
3b98c0c2
LE		 2986 struct drbd_conf *mdev;
2987 enum drbd_ret_code retcode;
b411b363
PR		 2988 int skip_initial_sync = 0;
2989 int err;
3b98c0c2 2990 struct new_c_uuid_parms args;
b411b363 2991
3b98c0c2
LE		 2992 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2993 if (!adm_ctx.reply_skb)
2994 return retcode;
2995 if (retcode != NO_ERROR)
2996 goto out_nolock;
b411b363 2997
3b98c0c2
LE		 2998 mdev = adm_ctx.mdev;
2999 memset(&args, 0, sizeof(args));
3000 if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
f399002e 3001 err = new_c_uuid_parms_from_attrs(&args, info);
3b98c0c2
LE		 3002 if (err) {
3003 retcode = ERR_MANDATORY_TAG;
3004 drbd_msg_put_info(from_attrs_err_to_txt(err));
3005 goto out_nolock;
3006 }
b411b363
PR		 3007 }
3008
8410da8f 3009 mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
b411b363
PR		 3010
3011 if (!get_ldev(mdev)) {
3012 retcode = ERR_NO_DISK;
3013 goto out;
3014 }
3015
3016 /* this is "skip initial sync", assume to be clean */
31890f4a 3017 if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
b411b363
PR		 3018 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
3019 dev_info(DEV, "Preparing to skip initial sync\n");
3020 skip_initial_sync = 1;
3021 } else if (mdev->state.conn != C_STANDALONE) {
3022 retcode = ERR_CONNECTED;
3023 goto out_dec;
3024 }
3025
3026 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
3027 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
3028
3029 if (args.clear_bm) {
20ceb2b2
LE		 3030 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
3031 "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
b411b363
PR		 3032 if (err) {
3033 dev_err(DEV, "Writing bitmap failed with %d\n",err);
3034 retcode = ERR_IO_MD_DISK;
3035 }
3036 if (skip_initial_sync) {
3037 drbd_send_uuids_skip_initial_sync(mdev);
3038 _drbd_uuid_set(mdev, UI_BITMAP, 0);
62b0da3a 3039 drbd_print_uuids(mdev, "cleared bitmap UUID");
87eeee41 3040 spin_lock_irq(&mdev->tconn->req_lock);
b411b363
PR		 3041 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3042 CS_VERBOSE, NULL);
87eeee41 3043 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363
PR		 3044 }
3045 }
3046
3047 drbd_md_sync(mdev);
3048out_dec:
3049 put_ldev(mdev);
3050out:
8410da8f 3051 mutex_unlock(mdev->state_mutex);
3b98c0c2
LE		 3052out_nolock:
3053 drbd_adm_finish(info, retcode);
774b3055
PR		 3054 return 0;
3055}
3056
3b98c0c2 3057static enum drbd_ret_code
7c3063cc 3058drbd_check_resource_name(const char *name)
774b3055 3059{
3b98c0c2 3060 if (!name || !name[0]) {
7c3063cc 3061 drbd_msg_put_info("resource name missing");
3b98c0c2 3062 return ERR_MANDATORY_TAG;
774b3055 3063 }
3b98c0c2
LE		 3064 /* if we want to use these in sysfs/configfs/debugfs some day,
3065 * we must not allow slashes */
3066 if (strchr(name, '/')) {
7c3063cc 3067 drbd_msg_put_info("invalid resource name");
3b98c0c2 3068 return ERR_INVALID_REQUEST;
774b3055 3069 }
3b98c0c2 3070 return NO_ERROR;
774b3055
PR		 3071}
3072
789c1b62 3073int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
b411b363 3074{
3b98c0c2 3075 enum drbd_ret_code retcode;
afbbfa88
AG		 3076 struct res_opts res_opts;
3077 int err;
9f5180e5 3078
3b98c0c2
LE		 3079 retcode = drbd_adm_prepare(skb, info, 0);
3080 if (!adm_ctx.reply_skb)
3081 return retcode;
3082 if (retcode != NO_ERROR)
3083 goto out;
b411b363 3084
afbbfa88
AG		 3085 set_res_opts_defaults(&res_opts);
3086 err = res_opts_from_attrs(&res_opts, info);
3087 if (err && err != -ENOMSG) {
3088 retcode = ERR_MANDATORY_TAG;
3089 drbd_msg_put_info(from_attrs_err_to_txt(err));
3090 goto out;
3091 }
3092
7c3063cc 3093 retcode = drbd_check_resource_name(adm_ctx.resource_name);
3b98c0c2
LE		 3094 if (retcode != NO_ERROR)
3095 goto out;
b411b363 3096
3b98c0c2 3097 if (adm_ctx.tconn) {
38f19616
LE		 3098 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
3099 retcode = ERR_INVALID_REQUEST;
789c1b62 3100 drbd_msg_put_info("resource exists");
38f19616
LE		 3101 }
3102 /* else: still NO_ERROR */
3b98c0c2 3103 goto out;
b411b363
PR		 3104 }
3105
afbbfa88 3106 if (!conn_create(adm_ctx.resource_name, &res_opts))
b411b363 3107 retcode = ERR_NOMEM;
3b98c0c2
LE		 3108out:
3109 drbd_adm_finish(info, retcode);
3110 return 0;
b411b363
PR		 3111}
3112
3b98c0c2 3113int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info)
b411b363 3114{
3b98c0c2
LE		 3115 struct drbd_genlmsghdr *dh = info->userhdr;
3116 enum drbd_ret_code retcode;
b411b363 3117
44e52cfa 3118 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3b98c0c2
LE		 3119 if (!adm_ctx.reply_skb)
3120 return retcode;
3121 if (retcode != NO_ERROR)
3122 goto out;
b411b363 3123
f2257a56 3124 if (dh->minor > MINORMASK) {
3b98c0c2
LE		 3125 drbd_msg_put_info("requested minor out of range");
3126 retcode = ERR_INVALID_REQUEST;
3127 goto out;
b411b363 3128 }
0c8e36d9 3129 if (adm_ctx.volume > DRBD_VOLUME_MAX) {
3b98c0c2
LE		 3130 drbd_msg_put_info("requested volume id out of range");
3131 retcode = ERR_INVALID_REQUEST;
3132 goto out;
b411b363 3133 }
b411b363 3134
38f19616
LE		 3135 /* drbd_adm_prepare made sure already
3136 * that mdev->tconn and mdev->vnr match the request. */
3137 if (adm_ctx.mdev) {
3138 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3139 retcode = ERR_MINOR_EXISTS;
3140 /* else: still NO_ERROR */
3141 goto out;
3142 }
3143
3b98c0c2
LE		 3144 retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume);
3145out:
3146 drbd_adm_finish(info, retcode);
3147 return 0;
b411b363
PR		 3148}
3149
85f75dd7
LE		 3150static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
3151{
3152 if (mdev->state.disk == D_DISKLESS &&
3153 /* no need to be mdev->state.conn == C_STANDALONE &&
3154 * we may want to delete a minor from a live replication group.
3155 */
3156 mdev->state.role == R_SECONDARY) {
369bea63
PR		 3157 _drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS),
3158 CS_VERBOSE + CS_WAIT_COMPLETE);
81fa2e67
PR		 3159 idr_remove(&mdev->tconn->volumes, mdev->vnr);
3160 idr_remove(&minors, mdev_to_minor(mdev));
3161 del_gendisk(mdev->vdisk);
3162 synchronize_rcu();
3163 kref_put(&mdev->kref, &drbd_minor_destroy);
85f75dd7
LE		 3164 return NO_ERROR;
3165 } else
3166 return ERR_MINOR_CONFIGURED;
3167}
3168
3b98c0c2 3169int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info)
b411b363 3170{
3b98c0c2 3171 enum drbd_ret_code retcode;
b411b363 3172
3b98c0c2
LE		 3173 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3174 if (!adm_ctx.reply_skb)
3175 return retcode;
3176 if (retcode != NO_ERROR)
3177 goto out;
b411b363 3178
85f75dd7 3179 retcode = adm_delete_minor(adm_ctx.mdev);
85f75dd7
LE		 3180out:
3181 drbd_adm_finish(info, retcode);
3182 return 0;
3183}
3184
3185int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3186{
f3dfa40a 3187 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
85f75dd7
LE		 3188 struct drbd_conf *mdev;
3189 unsigned i;
3190
3191 retcode = drbd_adm_prepare(skb, info, 0);
3192 if (!adm_ctx.reply_skb)
3193 return retcode;
3194 if (retcode != NO_ERROR)
3195 goto out;
3196
3197 if (!adm_ctx.tconn) {
789c1b62 3198 retcode = ERR_RES_NOT_KNOWN;
85f75dd7
LE		 3199 goto out;
3200 }
3201
85f75dd7
LE		 3202 /* demote */
3203 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3204 retcode = drbd_set_role(mdev, R_SECONDARY, 0);
3205 if (retcode < SS_SUCCESS) {
3206 drbd_msg_put_info("failed to demote");
c141ebda 3207 goto out;
85f75dd7
LE		 3208 }
3209 }
3210
f3dfa40a
LE		 3211 retcode = conn_try_disconnect(adm_ctx.tconn, 0);
3212 if (retcode < SS_SUCCESS) {
85f75dd7 3213 drbd_msg_put_info("failed to disconnect");
f3dfa40a 3214 goto out;
85f75dd7
LE		 3215 }
3216
3217 /* detach */
3218 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
cdfda633 3219 retcode = adm_detach(mdev, 0);
27012382 3220 if (retcode < SS_SUCCESS || retcode > NO_ERROR) {
85f75dd7 3221 drbd_msg_put_info("failed to detach");
c141ebda 3222 goto out;
85f75dd7
LE		 3223 }
3224 }
3225
f3dfa40a
LE		 3226 /* If we reach this, all volumes (of this tconn) are Secondary,
3227 * Disconnected, Diskless, aka Unconfigured. Make sure all threads have
c141ebda 3228 * actually stopped, state handling only does drbd_thread_stop_nowait(). */
f3dfa40a
LE		 3229 drbd_thread_stop(&adm_ctx.tconn->worker);
3230
3231 /* Now, nothing can fail anymore */
3232
85f75dd7
LE		 3233 /* delete volumes */
3234 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3235 retcode = adm_delete_minor(mdev);
3236 if (retcode != NO_ERROR) {
3237 /* "can not happen" */
3238 drbd_msg_put_info("failed to delete volume");
ef356262 3239 goto out;
85f75dd7
LE		 3240 }
3241 }
3242
85f75dd7
LE		 3243 /* delete connection */
3244 if (conn_lowest_minor(adm_ctx.tconn) < 0) {
ec0bddbc
PR		 3245 list_del_rcu(&adm_ctx.tconn->all_tconn);
3246 synchronize_rcu();
9dc9fbb3
PR		 3247 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3248
85f75dd7
LE		 3249 retcode = NO_ERROR;
3250 } else {
3251 /* "can not happen" */
789c1b62 3252 retcode = ERR_RES_IN_USE;
85f75dd7 3253 drbd_msg_put_info("failed to delete connection");
85f75dd7 3254 }
ef356262 3255 goto out;
3b98c0c2
LE		 3256out:
3257 drbd_adm_finish(info, retcode);
3258 return 0;
b411b363
PR		 3259}
3260
789c1b62 3261int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
b411b363 3262{
3b98c0c2 3263 enum drbd_ret_code retcode;
b411b363 3264
44e52cfa 3265 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3b98c0c2
LE		 3266 if (!adm_ctx.reply_skb)
3267 return retcode;
3268 if (retcode != NO_ERROR)
3269 goto out;
3270
3271 if (conn_lowest_minor(adm_ctx.tconn) < 0) {
ec0bddbc
PR		 3272 list_del_rcu(&adm_ctx.tconn->all_tconn);
3273 synchronize_rcu();
9dc9fbb3
PR		 3274 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3275
3b98c0c2
LE		 3276 retcode = NO_ERROR;
3277 } else {
789c1b62 3278 retcode = ERR_RES_IN_USE;
b411b363
PR		 3279 }
3280
992d6e91
LE		 3281 if (retcode == NO_ERROR)
3282 drbd_thread_stop(&adm_ctx.tconn->worker);
3b98c0c2
LE		 3283out:
3284 drbd_adm_finish(info, retcode);
b411b363
PR		 3285 return 0;
3286}
3287
3b98c0c2 3288void drbd_bcast_event(struct drbd_conf *mdev, const struct sib_info *sib)
b411b363 3289{
3b98c0c2
LE		 3290 static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3291 struct sk_buff *msg;
3292 struct drbd_genlmsghdr *d_out;
3293 unsigned seq;
3294 int err = -ENOMEM;
3295
3296 seq = atomic_inc_return(&drbd_genl_seq);
3297 msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3298 if (!msg)
3299 goto failed;
3300
3301 err = -EMSGSIZE;
3302 d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3303 if (!d_out) /* cannot happen, but anyways. */
3304 goto nla_put_failure;
3305 d_out->minor = mdev_to_minor(mdev);
6f9b5f84 3306 d_out->ret_code = NO_ERROR;
3b98c0c2
LE		 3307
3308 if (nla_put_status_info(msg, mdev, sib))
3309 goto nla_put_failure;
3310 genlmsg_end(msg, d_out);
3311 err = drbd_genl_multicast_events(msg, 0);
3312 /* msg has been consumed or freed in netlink_broadcast() */
3313 if (err && err != -ESRCH)
3314 goto failed;
b411b363 3315
3b98c0c2 3316 return;
b411b363 3317
3b98c0c2
LE		 3318nla_put_failure:
3319 nlmsg_free(msg);
3320failed:
3321 dev_err(DEV, "Error %d while broadcasting event. "
3322 "Event seq:%u sib_reason:%u\n",
3323 err, seq, sib->sib_reason);
b411b363 3324}
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