4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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>.
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)
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.
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.
26 #include <linux/module.h>
27 #include <linux/drbd.h>
30 #include <linux/file.h>
31 #include <linux/slab.h>
32 #include <linux/blkpg.h>
33 #include <linux/cpumask.h>
35 #include "drbd_protocol.h"
37 #include <asm/unaligned.h>
38 #include <linux/drbd_limits.h>
39 #include <linux/kthread.h>
41 #include <net/genetlink.h>
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);
47 int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info);
48 int drbd_adm_del_minor(struct sk_buff *skb, struct genl_info *info);
50 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info);
51 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info);
52 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info);
54 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info);
55 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info);
56 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info);
57 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info);
58 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info);
59 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info);
60 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info);
61 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info);
62 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info);
63 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info);
64 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info);
65 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info);
66 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info);
67 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info);
68 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info);
69 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info);
70 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info);
71 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info);
72 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info);
73 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info);
75 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb);
77 #include <linux/drbd_genl_api.h>
79 #include <linux/genl_magic_func.h>
81 /* used blkdev_get_by_path, to claim our meta data device(s) */
82 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
84 static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
86 genlmsg_end(skb, genlmsg_data(nlmsg_data(nlmsg_hdr(skb))));
87 if (genlmsg_reply(skb, info))
88 printk(KERN_ERR "drbd: error sending genl reply\n");
91 /* Used on a fresh "drbd_adm_prepare"d reply_skb, this cannot fail: The only
92 * reason it could fail was no space in skb, and there are 4k available. */
93 int drbd_msg_put_info(struct sk_buff *skb, const char *info)
98 if (!info || !info[0])
101 nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
105 err = nla_put_string(skb, T_info_text, info);
107 nla_nest_cancel(skb, nla);
110 nla_nest_end(skb, nla);
114 /* This would be a good candidate for a "pre_doit" hook,
115 * and per-family private info->pointers.
116 * But we need to stay compatible with older kernels.
117 * If it returns successfully, adm_ctx members are valid.
119 * At this point, we still rely on the global genl_lock().
120 * If we want to avoid that, and allow "genl_family.parallel_ops", we may need
121 * to add additional synchronization against object destruction/modification.
123 #define DRBD_ADM_NEED_MINOR 1
124 #define DRBD_ADM_NEED_RESOURCE 2
125 #define DRBD_ADM_NEED_CONNECTION 4
126 static int drbd_adm_prepare(struct drbd_config_context *adm_ctx,
127 struct sk_buff *skb, struct genl_info *info, unsigned flags)
129 struct drbd_genlmsghdr *d_in = info->userhdr;
130 const u8 cmd = info->genlhdr->cmd;
133 memset(adm_ctx, 0, sizeof(*adm_ctx));
135 /* genl_rcv_msg only checks for CAP_NET_ADMIN on "GENL_ADMIN_PERM" :( */
136 if (cmd != DRBD_ADM_GET_STATUS && !capable(CAP_NET_ADMIN))
139 adm_ctx->reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
140 if (!adm_ctx->reply_skb) {
145 adm_ctx->reply_dh = genlmsg_put_reply(adm_ctx->reply_skb,
146 info, &drbd_genl_family, 0, cmd);
147 /* put of a few bytes into a fresh skb of >= 4k will always succeed.
149 if (!adm_ctx->reply_dh) {
154 adm_ctx->reply_dh->minor = d_in->minor;
155 adm_ctx->reply_dh->ret_code = NO_ERROR;
157 adm_ctx->volume = VOLUME_UNSPECIFIED;
158 if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
160 /* parse and validate only */
161 err = drbd_cfg_context_from_attrs(NULL, info);
165 /* It was present, and valid,
166 * copy it over to the reply skb. */
167 err = nla_put_nohdr(adm_ctx->reply_skb,
168 info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
169 info->attrs[DRBD_NLA_CFG_CONTEXT]);
173 /* and assign stuff to the adm_ctx */
174 nla = nested_attr_tb[__nla_type(T_ctx_volume)];
176 adm_ctx->volume = nla_get_u32(nla);
177 nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
179 adm_ctx->resource_name = nla_data(nla);
180 adm_ctx->my_addr = nested_attr_tb[__nla_type(T_ctx_my_addr)];
181 adm_ctx->peer_addr = nested_attr_tb[__nla_type(T_ctx_peer_addr)];
182 if ((adm_ctx->my_addr &&
183 nla_len(adm_ctx->my_addr) > sizeof(adm_ctx->connection->my_addr)) ||
184 (adm_ctx->peer_addr &&
185 nla_len(adm_ctx->peer_addr) > sizeof(adm_ctx->connection->peer_addr))) {
191 adm_ctx->minor = d_in->minor;
192 adm_ctx->device = minor_to_device(d_in->minor);
194 /* We are protected by the global genl_lock().
195 * But we may explicitly drop it/retake it in drbd_adm_set_role(),
196 * so make sure this object stays around. */
198 kref_get(&adm_ctx->device->kref);
200 if (adm_ctx->resource_name) {
201 adm_ctx->resource = drbd_find_resource(adm_ctx->resource_name);
204 if (!adm_ctx->device && (flags & DRBD_ADM_NEED_MINOR)) {
205 drbd_msg_put_info(adm_ctx->reply_skb, "unknown minor");
206 return ERR_MINOR_INVALID;
208 if (!adm_ctx->resource && (flags & DRBD_ADM_NEED_RESOURCE)) {
209 drbd_msg_put_info(adm_ctx->reply_skb, "unknown resource");
210 if (adm_ctx->resource_name)
211 return ERR_RES_NOT_KNOWN;
212 return ERR_INVALID_REQUEST;
215 if (flags & DRBD_ADM_NEED_CONNECTION) {
216 if (adm_ctx->resource) {
217 drbd_msg_put_info(adm_ctx->reply_skb, "no resource name expected");
218 return ERR_INVALID_REQUEST;
220 if (adm_ctx->device) {
221 drbd_msg_put_info(adm_ctx->reply_skb, "no minor number expected");
222 return ERR_INVALID_REQUEST;
224 if (adm_ctx->my_addr && adm_ctx->peer_addr)
225 adm_ctx->connection = conn_get_by_addrs(nla_data(adm_ctx->my_addr),
226 nla_len(adm_ctx->my_addr),
227 nla_data(adm_ctx->peer_addr),
228 nla_len(adm_ctx->peer_addr));
229 if (!adm_ctx->connection) {
230 drbd_msg_put_info(adm_ctx->reply_skb, "unknown connection");
231 return ERR_INVALID_REQUEST;
235 /* some more paranoia, if the request was over-determined */
236 if (adm_ctx->device && adm_ctx->resource &&
237 adm_ctx->device->resource != adm_ctx->resource) {
238 pr_warning("request: minor=%u, resource=%s; but that minor belongs to resource %s\n",
239 adm_ctx->minor, adm_ctx->resource->name,
240 adm_ctx->device->resource->name);
241 drbd_msg_put_info(adm_ctx->reply_skb, "minor exists in different resource");
242 return ERR_INVALID_REQUEST;
244 if (adm_ctx->device &&
245 adm_ctx->volume != VOLUME_UNSPECIFIED &&
246 adm_ctx->volume != adm_ctx->device->vnr) {
247 pr_warning("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
248 adm_ctx->minor, adm_ctx->volume,
249 adm_ctx->device->vnr,
250 adm_ctx->device->resource->name);
251 drbd_msg_put_info(adm_ctx->reply_skb, "minor exists as different volume");
252 return ERR_INVALID_REQUEST;
255 /* still, provide adm_ctx->resource always, if possible. */
256 if (!adm_ctx->resource) {
257 adm_ctx->resource = adm_ctx->device ? adm_ctx->device->resource
258 : adm_ctx->connection ? adm_ctx->connection->resource : NULL;
259 if (adm_ctx->resource)
260 kref_get(&adm_ctx->resource->kref);
266 nlmsg_free(adm_ctx->reply_skb);
267 adm_ctx->reply_skb = NULL;
271 static int drbd_adm_finish(struct drbd_config_context *adm_ctx,
272 struct genl_info *info, int retcode)
274 if (adm_ctx->device) {
275 kref_put(&adm_ctx->device->kref, drbd_destroy_device);
276 adm_ctx->device = NULL;
278 if (adm_ctx->connection) {
279 kref_put(&adm_ctx->connection->kref, &drbd_destroy_connection);
280 adm_ctx->connection = NULL;
282 if (adm_ctx->resource) {
283 kref_put(&adm_ctx->resource->kref, drbd_destroy_resource);
284 adm_ctx->resource = NULL;
287 if (!adm_ctx->reply_skb)
290 adm_ctx->reply_dh->ret_code = retcode;
291 drbd_adm_send_reply(adm_ctx->reply_skb, info);
295 static void setup_khelper_env(struct drbd_connection *connection, char **envp)
299 /* FIXME: A future version will not allow this case. */
300 if (connection->my_addr_len == 0 || connection->peer_addr_len == 0)
303 switch (((struct sockaddr *)&connection->peer_addr)->sa_family) {
306 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
307 &((struct sockaddr_in6 *)&connection->peer_addr)->sin6_addr);
311 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
312 &((struct sockaddr_in *)&connection->peer_addr)->sin_addr);
316 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
317 &((struct sockaddr_in *)&connection->peer_addr)->sin_addr);
319 snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
322 int drbd_khelper(struct drbd_device *device, char *cmd)
324 char *envp[] = { "HOME=/",
326 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
327 (char[20]) { }, /* address family */
328 (char[60]) { }, /* address */
331 char *argv[] = {usermode_helper, cmd, mb, NULL };
332 struct drbd_connection *connection = first_peer_device(device)->connection;
336 if (current == connection->worker.task)
337 set_bit(CALLBACK_PENDING, &connection->flags);
339 snprintf(mb, 12, "minor-%d", device_to_minor(device));
340 setup_khelper_env(connection, envp);
342 /* The helper may take some time.
343 * write out any unsynced meta data changes now */
344 drbd_md_sync(device);
346 drbd_info(device, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
347 sib.sib_reason = SIB_HELPER_PRE;
348 sib.helper_name = cmd;
349 drbd_bcast_event(device, &sib);
350 ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
352 drbd_warn(device, "helper command: %s %s %s exit code %u (0x%x)\n",
353 usermode_helper, cmd, mb,
354 (ret >> 8) & 0xff, ret);
356 drbd_info(device, "helper command: %s %s %s exit code %u (0x%x)\n",
357 usermode_helper, cmd, mb,
358 (ret >> 8) & 0xff, ret);
359 sib.sib_reason = SIB_HELPER_POST;
360 sib.helper_exit_code = ret;
361 drbd_bcast_event(device, &sib);
363 if (current == connection->worker.task)
364 clear_bit(CALLBACK_PENDING, &connection->flags);
366 if (ret < 0) /* Ignore any ERRNOs we got. */
372 static int conn_khelper(struct drbd_connection *connection, char *cmd)
374 char *envp[] = { "HOME=/",
376 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
377 (char[20]) { }, /* address family */
378 (char[60]) { }, /* address */
380 char *resource_name = connection->resource->name;
381 char *argv[] = {usermode_helper, cmd, resource_name, NULL };
384 setup_khelper_env(connection, envp);
385 conn_md_sync(connection);
387 drbd_info(connection, "helper command: %s %s %s\n", usermode_helper, cmd, resource_name);
388 /* TODO: conn_bcast_event() ?? */
390 ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
392 drbd_warn(connection, "helper command: %s %s %s exit code %u (0x%x)\n",
393 usermode_helper, cmd, resource_name,
394 (ret >> 8) & 0xff, ret);
396 drbd_info(connection, "helper command: %s %s %s exit code %u (0x%x)\n",
397 usermode_helper, cmd, resource_name,
398 (ret >> 8) & 0xff, ret);
399 /* TODO: conn_bcast_event() ?? */
401 if (ret < 0) /* Ignore any ERRNOs we got. */
407 static enum drbd_fencing_p highest_fencing_policy(struct drbd_connection *connection)
409 enum drbd_fencing_p fp = FP_NOT_AVAIL;
410 struct drbd_peer_device *peer_device;
414 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
415 struct drbd_device *device = peer_device->device;
416 if (get_ldev_if_state(device, D_CONSISTENT)) {
417 struct disk_conf *disk_conf =
418 rcu_dereference(peer_device->device->ldev->disk_conf);
419 fp = max_t(enum drbd_fencing_p, fp, disk_conf->fencing);
425 if (fp == FP_NOT_AVAIL) {
426 /* IO Suspending works on the whole resource.
427 Do it only for one device. */
429 peer_device = idr_get_next(&connection->peer_devices, &vnr);
430 drbd_change_state(peer_device->device, CS_VERBOSE | CS_HARD, NS(susp_fen, 0));
436 bool conn_try_outdate_peer(struct drbd_connection *connection)
438 unsigned int connect_cnt;
439 union drbd_state mask = { };
440 union drbd_state val = { };
441 enum drbd_fencing_p fp;
445 spin_lock_irq(&connection->resource->req_lock);
446 if (connection->cstate >= C_WF_REPORT_PARAMS) {
447 drbd_err(connection, "Expected cstate < C_WF_REPORT_PARAMS\n");
448 spin_unlock_irq(&connection->resource->req_lock);
452 connect_cnt = connection->connect_cnt;
453 spin_unlock_irq(&connection->resource->req_lock);
455 fp = highest_fencing_policy(connection);
458 drbd_warn(connection, "Not fencing peer, I'm not even Consistent myself.\n");
465 r = conn_khelper(connection, "fence-peer");
467 switch ((r>>8) & 0xff) {
468 case 3: /* peer is inconsistent */
469 ex_to_string = "peer is inconsistent or worse";
471 val.pdsk = D_INCONSISTENT;
473 case 4: /* peer got outdated, or was already outdated */
474 ex_to_string = "peer was fenced";
476 val.pdsk = D_OUTDATED;
478 case 5: /* peer was down */
479 if (conn_highest_disk(connection) == D_UP_TO_DATE) {
480 /* we will(have) create(d) a new UUID anyways... */
481 ex_to_string = "peer is unreachable, assumed to be dead";
483 val.pdsk = D_OUTDATED;
485 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
488 case 6: /* Peer is primary, voluntarily outdate myself.
489 * This is useful when an unconnected R_SECONDARY is asked to
490 * become R_PRIMARY, but finds the other peer being active. */
491 ex_to_string = "peer is active";
492 drbd_warn(connection, "Peer is primary, outdating myself.\n");
494 val.disk = D_OUTDATED;
497 if (fp != FP_STONITH)
498 drbd_err(connection, "fence-peer() = 7 && fencing != Stonith !!!\n");
499 ex_to_string = "peer was stonithed";
501 val.pdsk = D_OUTDATED;
504 /* The script is broken ... */
505 drbd_err(connection, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
506 return false; /* Eventually leave IO frozen */
509 drbd_info(connection, "fence-peer helper returned %d (%s)\n",
510 (r>>8) & 0xff, ex_to_string);
515 conn_request_state(connection, mask, val, CS_VERBOSE);
516 here, because we might were able to re-establish the connection in the
518 spin_lock_irq(&connection->resource->req_lock);
519 if (connection->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &connection->flags)) {
520 if (connection->connect_cnt != connect_cnt)
521 /* In case the connection was established and droped
522 while the fence-peer handler was running, ignore it */
523 drbd_info(connection, "Ignoring fence-peer exit code\n");
525 _conn_request_state(connection, mask, val, CS_VERBOSE);
527 spin_unlock_irq(&connection->resource->req_lock);
529 return conn_highest_pdsk(connection) <= D_OUTDATED;
532 static int _try_outdate_peer_async(void *data)
534 struct drbd_connection *connection = (struct drbd_connection *)data;
536 conn_try_outdate_peer(connection);
538 kref_put(&connection->kref, drbd_destroy_connection);
542 void conn_try_outdate_peer_async(struct drbd_connection *connection)
544 struct task_struct *opa;
546 kref_get(&connection->kref);
547 /* We may just have force_sig()'ed this thread
548 * to get it out of some blocking network function.
549 * Clear signals; otherwise kthread_run(), which internally uses
550 * wait_on_completion_killable(), will mistake our pending signal
551 * for a new fatal signal and fail. */
552 flush_signals(current);
553 opa = kthread_run(_try_outdate_peer_async, connection, "drbd_async_h");
555 drbd_err(connection, "out of mem, failed to invoke fence-peer helper\n");
556 kref_put(&connection->kref, drbd_destroy_connection);
561 drbd_set_role(struct drbd_device *device, enum drbd_role new_role, int force)
563 const int max_tries = 4;
564 enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
568 union drbd_state mask, val;
570 if (new_role == R_PRIMARY) {
571 struct drbd_connection *connection;
573 /* Detect dead peers as soon as possible. */
576 for_each_connection(connection, device->resource)
577 request_ping(connection);
581 mutex_lock(device->state_mutex);
583 mask.i = 0; mask.role = R_MASK;
584 val.i = 0; val.role = new_role;
586 while (try++ < max_tries) {
587 rv = _drbd_request_state(device, mask, val, CS_WAIT_COMPLETE);
589 /* in case we first succeeded to outdate,
590 * but now suddenly could establish a connection */
591 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
597 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
598 (device->state.disk < D_UP_TO_DATE &&
599 device->state.disk >= D_INCONSISTENT)) {
601 val.disk = D_UP_TO_DATE;
606 if (rv == SS_NO_UP_TO_DATE_DISK &&
607 device->state.disk == D_CONSISTENT && mask.pdsk == 0) {
608 D_ASSERT(device, device->state.pdsk == D_UNKNOWN);
610 if (conn_try_outdate_peer(first_peer_device(device)->connection)) {
611 val.disk = D_UP_TO_DATE;
617 if (rv == SS_NOTHING_TO_DO)
619 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
620 if (!conn_try_outdate_peer(first_peer_device(device)->connection) && force) {
621 drbd_warn(device, "Forced into split brain situation!\n");
623 val.pdsk = D_OUTDATED;
628 if (rv == SS_TWO_PRIMARIES) {
629 /* Maybe the peer is detected as dead very soon...
630 retry at most once more in this case. */
633 nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
634 timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
636 schedule_timeout_interruptible(timeo);
641 if (rv < SS_SUCCESS) {
642 rv = _drbd_request_state(device, mask, val,
643 CS_VERBOSE + CS_WAIT_COMPLETE);
654 drbd_warn(device, "Forced to consider local data as UpToDate!\n");
656 /* Wait until nothing is on the fly :) */
657 wait_event(device->misc_wait, atomic_read(&device->ap_pending_cnt) == 0);
659 /* FIXME also wait for all pending P_BARRIER_ACK? */
661 if (new_role == R_SECONDARY) {
662 set_disk_ro(device->vdisk, true);
663 if (get_ldev(device)) {
664 device->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
668 /* Called from drbd_adm_set_role only.
669 * We are still holding the conf_update mutex. */
670 nc = first_peer_device(device)->connection->net_conf;
672 nc->discard_my_data = 0; /* without copy; single bit op is atomic */
674 set_disk_ro(device->vdisk, false);
675 if (get_ldev(device)) {
676 if (((device->state.conn < C_CONNECTED ||
677 device->state.pdsk <= D_FAILED)
678 && device->ldev->md.uuid[UI_BITMAP] == 0) || forced)
679 drbd_uuid_new_current(device);
681 device->ldev->md.uuid[UI_CURRENT] |= (u64)1;
686 /* writeout of activity log covered areas of the bitmap
687 * to stable storage done in after state change already */
689 if (device->state.conn >= C_WF_REPORT_PARAMS) {
690 /* if this was forced, we should consider sync */
692 drbd_send_uuids(first_peer_device(device));
693 drbd_send_current_state(first_peer_device(device));
696 drbd_md_sync(device);
698 kobject_uevent(&disk_to_dev(device->vdisk)->kobj, KOBJ_CHANGE);
700 mutex_unlock(device->state_mutex);
704 static const char *from_attrs_err_to_txt(int err)
706 return err == -ENOMSG ? "required attribute missing" :
707 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
708 err == -EEXIST ? "can not change invariant setting" :
709 "invalid attribute value";
712 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
714 struct drbd_config_context adm_ctx;
715 struct set_role_parms parms;
717 enum drbd_ret_code retcode;
719 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
720 if (!adm_ctx.reply_skb)
722 if (retcode != NO_ERROR)
725 memset(&parms, 0, sizeof(parms));
726 if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
727 err = set_role_parms_from_attrs(&parms, info);
729 retcode = ERR_MANDATORY_TAG;
730 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
735 mutex_lock(&adm_ctx.resource->adm_mutex);
737 if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
738 retcode = drbd_set_role(adm_ctx.device, R_PRIMARY, parms.assume_uptodate);
740 retcode = drbd_set_role(adm_ctx.device, R_SECONDARY, 0);
742 mutex_unlock(&adm_ctx.resource->adm_mutex);
745 drbd_adm_finish(&adm_ctx, info, retcode);
749 /* Initializes the md.*_offset members, so we are able to find
750 * the on disk meta data.
752 * We currently have two possible layouts:
754 * |----------- md_size_sect ------------------|
755 * [ 4k superblock ][ activity log ][ Bitmap ]
757 * | bm_offset = al_offset + X |
758 * ==> bitmap sectors = md_size_sect - bm_offset
761 * |----------- md_size_sect ------------------|
762 * [data.....][ Bitmap ][ activity log ][ 4k superblock ]
764 * | bm_offset = al_offset - Y |
765 * ==> bitmap sectors = Y = al_offset - bm_offset
767 * Activity log size used to be fixed 32kB,
768 * but is about to become configurable.
770 static void drbd_md_set_sector_offsets(struct drbd_device *device,
771 struct drbd_backing_dev *bdev)
773 sector_t md_size_sect = 0;
774 unsigned int al_size_sect = bdev->md.al_size_4k * 8;
776 bdev->md.md_offset = drbd_md_ss(bdev);
778 switch (bdev->md.meta_dev_idx) {
780 /* v07 style fixed size indexed meta data */
781 bdev->md.md_size_sect = MD_128MB_SECT;
782 bdev->md.al_offset = MD_4kB_SECT;
783 bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
785 case DRBD_MD_INDEX_FLEX_EXT:
786 /* just occupy the full device; unit: sectors */
787 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
788 bdev->md.al_offset = MD_4kB_SECT;
789 bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
791 case DRBD_MD_INDEX_INTERNAL:
792 case DRBD_MD_INDEX_FLEX_INT:
793 /* al size is still fixed */
794 bdev->md.al_offset = -al_size_sect;
795 /* we need (slightly less than) ~ this much bitmap sectors: */
796 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
797 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
798 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
799 md_size_sect = ALIGN(md_size_sect, 8);
801 /* plus the "drbd meta data super block",
802 * and the activity log; */
803 md_size_sect += MD_4kB_SECT + al_size_sect;
805 bdev->md.md_size_sect = md_size_sect;
806 /* bitmap offset is adjusted by 'super' block size */
807 bdev->md.bm_offset = -md_size_sect + MD_4kB_SECT;
812 /* input size is expected to be in KB */
813 char *ppsize(char *buf, unsigned long long size)
815 /* Needs 9 bytes at max including trailing NUL:
816 * -1ULL ==> "16384 EB" */
817 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
819 while (size >= 10000 && base < sizeof(units)-1) {
821 size = (size >> 10) + !!(size & (1<<9));
824 sprintf(buf, "%u %cB", (unsigned)size, units[base]);
829 /* there is still a theoretical deadlock when called from receiver
830 * on an D_INCONSISTENT R_PRIMARY:
831 * remote READ does inc_ap_bio, receiver would need to receive answer
832 * packet from remote to dec_ap_bio again.
833 * receiver receive_sizes(), comes here,
834 * waits for ap_bio_cnt == 0. -> deadlock.
835 * but this cannot happen, actually, because:
836 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
837 * (not connected, or bad/no disk on peer):
838 * see drbd_fail_request_early, ap_bio_cnt is zero.
839 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
840 * peer may not initiate a resize.
842 /* Note these are not to be confused with
843 * drbd_adm_suspend_io/drbd_adm_resume_io,
844 * which are (sub) state changes triggered by admin (drbdsetup),
845 * and can be long lived.
846 * This changes an device->flag, is triggered by drbd internals,
847 * and should be short-lived. */
848 void drbd_suspend_io(struct drbd_device *device)
850 set_bit(SUSPEND_IO, &device->flags);
851 if (drbd_suspended(device))
853 wait_event(device->misc_wait, !atomic_read(&device->ap_bio_cnt));
856 void drbd_resume_io(struct drbd_device *device)
858 clear_bit(SUSPEND_IO, &device->flags);
859 wake_up(&device->misc_wait);
863 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
864 * @device: DRBD device.
866 * Returns 0 on success, negative return values indicate errors.
867 * You should call drbd_md_sync() after calling this function.
869 enum determine_dev_size
870 drbd_determine_dev_size(struct drbd_device *device, enum dds_flags flags, struct resize_parms *rs) __must_hold(local)
872 sector_t prev_first_sect, prev_size; /* previous meta location */
873 sector_t la_size_sect, u_size;
874 struct drbd_md *md = &device->ldev->md;
875 u32 prev_al_stripe_size_4k;
881 int md_moved, la_size_changed;
882 enum determine_dev_size rv = DS_UNCHANGED;
885 * application request passes inc_ap_bio,
886 * but then cannot get an AL-reference.
887 * this function later may wait on ap_bio_cnt == 0. -> deadlock.
890 * Suspend IO right here.
891 * still lock the act_log to not trigger ASSERTs there.
893 drbd_suspend_io(device);
894 buffer = drbd_md_get_buffer(device); /* Lock meta-data IO */
896 drbd_resume_io(device);
900 /* no wait necessary anymore, actually we could assert that */
901 wait_event(device->al_wait, lc_try_lock(device->act_log));
903 prev_first_sect = drbd_md_first_sector(device->ldev);
904 prev_size = device->ldev->md.md_size_sect;
905 la_size_sect = device->ldev->md.la_size_sect;
908 /* rs is non NULL if we should change the AL layout only */
910 prev_al_stripes = md->al_stripes;
911 prev_al_stripe_size_4k = md->al_stripe_size_4k;
913 md->al_stripes = rs->al_stripes;
914 md->al_stripe_size_4k = rs->al_stripe_size / 4;
915 md->al_size_4k = (u64)rs->al_stripes * rs->al_stripe_size / 4;
918 drbd_md_set_sector_offsets(device, device->ldev);
921 u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
923 size = drbd_new_dev_size(device, device->ldev, u_size, flags & DDSF_FORCED);
925 if (size < la_size_sect) {
926 if (rs && u_size == 0) {
927 /* Remove "rs &&" later. This check should always be active, but
928 right now the receiver expects the permissive behavior */
929 drbd_warn(device, "Implicit shrink not allowed. "
930 "Use --size=%llus for explicit shrink.\n",
931 (unsigned long long)size);
932 rv = DS_ERROR_SHRINK;
935 rv = DS_ERROR_SPACE_MD;
936 if (rv != DS_UNCHANGED)
940 if (drbd_get_capacity(device->this_bdev) != size ||
941 drbd_bm_capacity(device) != size) {
943 err = drbd_bm_resize(device, size, !(flags & DDSF_NO_RESYNC));
945 /* currently there is only one error: ENOMEM! */
946 size = drbd_bm_capacity(device)>>1;
948 drbd_err(device, "OUT OF MEMORY! "
949 "Could not allocate bitmap!\n");
951 drbd_err(device, "BM resizing failed. "
952 "Leaving size unchanged at size = %lu KB\n",
953 (unsigned long)size);
957 /* racy, see comments above. */
958 drbd_set_my_capacity(device, size);
959 device->ldev->md.la_size_sect = size;
960 drbd_info(device, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
961 (unsigned long long)size>>1);
966 la_size_changed = (la_size_sect != device->ldev->md.la_size_sect);
968 md_moved = prev_first_sect != drbd_md_first_sector(device->ldev)
969 || prev_size != device->ldev->md.md_size_sect;
971 if (la_size_changed || md_moved || rs) {
974 drbd_al_shrink(device); /* All extents inactive. */
976 prev_flags = md->flags;
977 md->flags &= ~MDF_PRIMARY_IND;
978 drbd_md_write(device, buffer);
980 drbd_info(device, "Writing the whole bitmap, %s\n",
981 la_size_changed && md_moved ? "size changed and md moved" :
982 la_size_changed ? "size changed" : "md moved");
983 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
984 drbd_bitmap_io(device, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
985 "size changed", BM_LOCKED_MASK);
986 drbd_initialize_al(device, buffer);
988 md->flags = prev_flags;
989 drbd_md_write(device, buffer);
992 drbd_info(device, "Changed AL layout to al-stripes = %d, al-stripe-size-kB = %d\n",
993 md->al_stripes, md->al_stripe_size_4k * 4);
996 if (size > la_size_sect)
997 rv = la_size_sect ? DS_GREW : DS_GREW_FROM_ZERO;
998 if (size < la_size_sect)
1004 md->al_stripes = prev_al_stripes;
1005 md->al_stripe_size_4k = prev_al_stripe_size_4k;
1006 md->al_size_4k = (u64)prev_al_stripes * prev_al_stripe_size_4k;
1008 drbd_md_set_sector_offsets(device, device->ldev);
1011 lc_unlock(device->act_log);
1012 wake_up(&device->al_wait);
1013 drbd_md_put_buffer(device);
1014 drbd_resume_io(device);
1020 drbd_new_dev_size(struct drbd_device *device, struct drbd_backing_dev *bdev,
1021 sector_t u_size, int assume_peer_has_space)
1023 sector_t p_size = device->p_size; /* partner's disk size. */
1024 sector_t la_size_sect = bdev->md.la_size_sect; /* last agreed size. */
1025 sector_t m_size; /* my size */
1028 m_size = drbd_get_max_capacity(bdev);
1030 if (device->state.conn < C_CONNECTED && assume_peer_has_space) {
1031 drbd_warn(device, "Resize while not connected was forced by the user!\n");
1035 if (p_size && m_size) {
1036 size = min_t(sector_t, p_size, m_size);
1039 size = la_size_sect;
1040 if (m_size && m_size < size)
1042 if (p_size && p_size < size)
1053 drbd_err(device, "Both nodes diskless!\n");
1057 drbd_err(device, "Requested disk size is too big (%lu > %lu)\n",
1058 (unsigned long)u_size>>1, (unsigned long)size>>1);
1067 * drbd_check_al_size() - Ensures that the AL is of the right size
1068 * @device: DRBD device.
1070 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
1071 * failed, and 0 on success. You should call drbd_md_sync() after you called
1074 static int drbd_check_al_size(struct drbd_device *device, struct disk_conf *dc)
1076 struct lru_cache *n, *t;
1077 struct lc_element *e;
1078 unsigned int in_use;
1081 if (device->act_log &&
1082 device->act_log->nr_elements == dc->al_extents)
1086 t = device->act_log;
1087 n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
1088 dc->al_extents, sizeof(struct lc_element), 0);
1091 drbd_err(device, "Cannot allocate act_log lru!\n");
1094 spin_lock_irq(&device->al_lock);
1096 for (i = 0; i < t->nr_elements; i++) {
1097 e = lc_element_by_index(t, i);
1099 drbd_err(device, "refcnt(%d)==%d\n",
1100 e->lc_number, e->refcnt);
1101 in_use += e->refcnt;
1105 device->act_log = n;
1106 spin_unlock_irq(&device->al_lock);
1108 drbd_err(device, "Activity log still in use!\n");
1115 drbd_md_mark_dirty(device); /* we changed device->act_log->nr_elemens */
1119 static void drbd_setup_queue_param(struct drbd_device *device, unsigned int max_bio_size)
1121 struct request_queue * const q = device->rq_queue;
1122 unsigned int max_hw_sectors = max_bio_size >> 9;
1123 unsigned int max_segments = 0;
1124 struct request_queue *b = NULL;
1126 if (get_ldev_if_state(device, D_ATTACHING)) {
1127 b = device->ldev->backing_bdev->bd_disk->queue;
1129 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
1131 max_segments = rcu_dereference(device->ldev->disk_conf)->max_bio_bvecs;
1134 blk_set_stacking_limits(&q->limits);
1135 blk_queue_max_write_same_sectors(q, 0);
1138 blk_queue_logical_block_size(q, 512);
1139 blk_queue_max_hw_sectors(q, max_hw_sectors);
1140 /* This is the workaround for "bio would need to, but cannot, be split" */
1141 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1142 blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
1145 struct drbd_connection *connection = first_peer_device(device)->connection;
1147 if (blk_queue_discard(b) &&
1148 (connection->cstate < C_CONNECTED || connection->agreed_features & FF_TRIM)) {
1149 /* For now, don't allow more than one activity log extent worth of data
1150 * to be discarded in one go. We may need to rework drbd_al_begin_io()
1151 * to allow for even larger discard ranges */
1152 q->limits.max_discard_sectors = DRBD_MAX_DISCARD_SECTORS;
1154 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1155 /* REALLY? Is stacking secdiscard "legal"? */
1156 if (blk_queue_secdiscard(b))
1157 queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
1159 q->limits.max_discard_sectors = 0;
1160 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
1161 queue_flag_clear_unlocked(QUEUE_FLAG_SECDISCARD, q);
1164 blk_queue_stack_limits(q, b);
1166 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
1167 drbd_info(device, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
1168 q->backing_dev_info.ra_pages,
1169 b->backing_dev_info.ra_pages);
1170 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1176 void drbd_reconsider_max_bio_size(struct drbd_device *device)
1178 unsigned int now, new, local, peer;
1180 now = queue_max_hw_sectors(device->rq_queue) << 9;
1181 local = device->local_max_bio_size; /* Eventually last known value, from volatile memory */
1182 peer = device->peer_max_bio_size; /* Eventually last known value, from meta data */
1184 if (get_ldev_if_state(device, D_ATTACHING)) {
1185 local = queue_max_hw_sectors(device->ldev->backing_bdev->bd_disk->queue) << 9;
1186 device->local_max_bio_size = local;
1189 local = min(local, DRBD_MAX_BIO_SIZE);
1191 /* We may ignore peer limits if the peer is modern enough.
1192 Because new from 8.3.8 onwards the peer can use multiple
1193 BIOs for a single peer_request */
1194 if (device->state.conn >= C_WF_REPORT_PARAMS) {
1195 if (first_peer_device(device)->connection->agreed_pro_version < 94)
1196 peer = min(device->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
1197 /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
1198 else if (first_peer_device(device)->connection->agreed_pro_version == 94)
1199 peer = DRBD_MAX_SIZE_H80_PACKET;
1200 else if (first_peer_device(device)->connection->agreed_pro_version < 100)
1201 peer = DRBD_MAX_BIO_SIZE_P95; /* drbd 8.3.8 onwards, before 8.4.0 */
1203 peer = DRBD_MAX_BIO_SIZE;
1205 /* We may later detach and re-attach on a disconnected Primary.
1206 * Avoid this setting to jump back in that case.
1207 * We want to store what we know the peer DRBD can handle,
1208 * not what the peer IO backend can handle. */
1209 if (peer > device->peer_max_bio_size)
1210 device->peer_max_bio_size = peer;
1212 new = min(local, peer);
1214 if (device->state.role == R_PRIMARY && new < now)
1215 drbd_err(device, "ASSERT FAILED new < now; (%u < %u)\n", new, now);
1218 drbd_info(device, "max BIO size = %u\n", new);
1220 drbd_setup_queue_param(device, new);
1223 /* Starts the worker thread */
1224 static void conn_reconfig_start(struct drbd_connection *connection)
1226 drbd_thread_start(&connection->worker);
1227 drbd_flush_workqueue(&connection->sender_work);
1230 /* if still unconfigured, stops worker again. */
1231 static void conn_reconfig_done(struct drbd_connection *connection)
1234 spin_lock_irq(&connection->resource->req_lock);
1235 stop_threads = conn_all_vols_unconf(connection) &&
1236 connection->cstate == C_STANDALONE;
1237 spin_unlock_irq(&connection->resource->req_lock);
1239 /* asender is implicitly stopped by receiver
1240 * in conn_disconnect() */
1241 drbd_thread_stop(&connection->receiver);
1242 drbd_thread_stop(&connection->worker);
1246 /* Make sure IO is suspended before calling this function(). */
1247 static void drbd_suspend_al(struct drbd_device *device)
1251 if (!lc_try_lock(device->act_log)) {
1252 drbd_warn(device, "Failed to lock al in drbd_suspend_al()\n");
1256 drbd_al_shrink(device);
1257 spin_lock_irq(&device->resource->req_lock);
1258 if (device->state.conn < C_CONNECTED)
1259 s = !test_and_set_bit(AL_SUSPENDED, &device->flags);
1260 spin_unlock_irq(&device->resource->req_lock);
1261 lc_unlock(device->act_log);
1264 drbd_info(device, "Suspended AL updates\n");
1268 static bool should_set_defaults(struct genl_info *info)
1270 unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1271 return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1274 static unsigned int drbd_al_extents_max(struct drbd_backing_dev *bdev)
1276 /* This is limited by 16 bit "slot" numbers,
1277 * and by available on-disk context storage.
1279 * Also (u16)~0 is special (denotes a "free" extent).
1281 * One transaction occupies one 4kB on-disk block,
1282 * we have n such blocks in the on disk ring buffer,
1283 * the "current" transaction may fail (n-1),
1284 * and there is 919 slot numbers context information per transaction.
1286 * 72 transaction blocks amounts to more than 2**16 context slots,
1287 * so cap there first.
1289 const unsigned int max_al_nr = DRBD_AL_EXTENTS_MAX;
1290 const unsigned int sufficient_on_disk =
1291 (max_al_nr + AL_CONTEXT_PER_TRANSACTION -1)
1292 /AL_CONTEXT_PER_TRANSACTION;
1294 unsigned int al_size_4k = bdev->md.al_size_4k;
1296 if (al_size_4k > sufficient_on_disk)
1299 return (al_size_4k - 1) * AL_CONTEXT_PER_TRANSACTION;
1302 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1304 struct drbd_config_context adm_ctx;
1305 enum drbd_ret_code retcode;
1306 struct drbd_device *device;
1307 struct disk_conf *new_disk_conf, *old_disk_conf;
1308 struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
1311 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
1312 if (!adm_ctx.reply_skb)
1314 if (retcode != NO_ERROR)
1317 device = adm_ctx.device;
1318 mutex_lock(&adm_ctx.resource->adm_mutex);
1320 /* we also need a disk
1321 * to change the options on */
1322 if (!get_ldev(device)) {
1323 retcode = ERR_NO_DISK;
1327 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
1328 if (!new_disk_conf) {
1329 retcode = ERR_NOMEM;
1333 mutex_lock(&device->resource->conf_update);
1334 old_disk_conf = device->ldev->disk_conf;
1335 *new_disk_conf = *old_disk_conf;
1336 if (should_set_defaults(info))
1337 set_disk_conf_defaults(new_disk_conf);
1339 err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1340 if (err && err != -ENOMSG) {
1341 retcode = ERR_MANDATORY_TAG;
1342 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
1346 if (!expect(new_disk_conf->resync_rate >= 1))
1347 new_disk_conf->resync_rate = 1;
1349 if (new_disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
1350 new_disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
1351 if (new_disk_conf->al_extents > drbd_al_extents_max(device->ldev))
1352 new_disk_conf->al_extents = drbd_al_extents_max(device->ldev);
1354 if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1355 new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1357 fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1358 if (fifo_size != device->rs_plan_s->size) {
1359 new_plan = fifo_alloc(fifo_size);
1361 drbd_err(device, "kmalloc of fifo_buffer failed");
1362 retcode = ERR_NOMEM;
1367 drbd_suspend_io(device);
1368 wait_event(device->al_wait, lc_try_lock(device->act_log));
1369 drbd_al_shrink(device);
1370 err = drbd_check_al_size(device, new_disk_conf);
1371 lc_unlock(device->act_log);
1372 wake_up(&device->al_wait);
1373 drbd_resume_io(device);
1376 retcode = ERR_NOMEM;
1380 write_lock_irq(&global_state_lock);
1381 retcode = drbd_resync_after_valid(device, new_disk_conf->resync_after);
1382 if (retcode == NO_ERROR) {
1383 rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
1384 drbd_resync_after_changed(device);
1386 write_unlock_irq(&global_state_lock);
1388 if (retcode != NO_ERROR)
1392 old_plan = device->rs_plan_s;
1393 rcu_assign_pointer(device->rs_plan_s, new_plan);
1396 mutex_unlock(&device->resource->conf_update);
1398 if (new_disk_conf->al_updates)
1399 device->ldev->md.flags &= ~MDF_AL_DISABLED;
1401 device->ldev->md.flags |= MDF_AL_DISABLED;
1403 if (new_disk_conf->md_flushes)
1404 clear_bit(MD_NO_FUA, &device->flags);
1406 set_bit(MD_NO_FUA, &device->flags);
1408 drbd_bump_write_ordering(first_peer_device(device)->connection, WO_bdev_flush);
1410 drbd_md_sync(device);
1412 if (device->state.conn >= C_CONNECTED) {
1413 struct drbd_peer_device *peer_device;
1415 for_each_peer_device(peer_device, device)
1416 drbd_send_sync_param(peer_device);
1420 kfree(old_disk_conf);
1422 mod_timer(&device->request_timer, jiffies + HZ);
1426 mutex_unlock(&device->resource->conf_update);
1428 kfree(new_disk_conf);
1433 mutex_unlock(&adm_ctx.resource->adm_mutex);
1435 drbd_adm_finish(&adm_ctx, info, retcode);
1439 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1441 struct drbd_config_context adm_ctx;
1442 struct drbd_device *device;
1444 enum drbd_ret_code retcode;
1445 enum determine_dev_size dd;
1446 sector_t max_possible_sectors;
1447 sector_t min_md_device_sectors;
1448 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1449 struct disk_conf *new_disk_conf = NULL;
1450 struct block_device *bdev;
1451 struct lru_cache *resync_lru = NULL;
1452 struct fifo_buffer *new_plan = NULL;
1453 union drbd_state ns, os;
1454 enum drbd_state_rv rv;
1455 struct net_conf *nc;
1457 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
1458 if (!adm_ctx.reply_skb)
1460 if (retcode != NO_ERROR)
1463 device = adm_ctx.device;
1464 mutex_lock(&adm_ctx.resource->adm_mutex);
1465 conn_reconfig_start(first_peer_device(device)->connection);
1467 /* if you want to reconfigure, please tear down first */
1468 if (device->state.disk > D_DISKLESS) {
1469 retcode = ERR_DISK_CONFIGURED;
1472 /* It may just now have detached because of IO error. Make sure
1473 * drbd_ldev_destroy is done already, we may end up here very fast,
1474 * e.g. if someone calls attach from the on-io-error handler,
1475 * to realize a "hot spare" feature (not that I'd recommend that) */
1476 wait_event(device->misc_wait, !atomic_read(&device->local_cnt));
1478 /* make sure there is no leftover from previous force-detach attempts */
1479 clear_bit(FORCE_DETACH, &device->flags);
1480 clear_bit(WAS_IO_ERROR, &device->flags);
1481 clear_bit(WAS_READ_ERROR, &device->flags);
1483 /* and no leftover from previously aborted resync or verify, either */
1484 device->rs_total = 0;
1485 device->rs_failed = 0;
1486 atomic_set(&device->rs_pending_cnt, 0);
1488 /* allocation not in the IO path, drbdsetup context */
1489 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1491 retcode = ERR_NOMEM;
1494 spin_lock_init(&nbc->md.uuid_lock);
1496 new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1497 if (!new_disk_conf) {
1498 retcode = ERR_NOMEM;
1501 nbc->disk_conf = new_disk_conf;
1503 set_disk_conf_defaults(new_disk_conf);
1504 err = disk_conf_from_attrs(new_disk_conf, info);
1506 retcode = ERR_MANDATORY_TAG;
1507 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
1511 if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1512 new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1514 new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1516 retcode = ERR_NOMEM;
1520 if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1521 retcode = ERR_MD_IDX_INVALID;
1525 write_lock_irq(&global_state_lock);
1526 retcode = drbd_resync_after_valid(device, new_disk_conf->resync_after);
1527 write_unlock_irq(&global_state_lock);
1528 if (retcode != NO_ERROR)
1532 nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
1534 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1536 retcode = ERR_STONITH_AND_PROT_A;
1542 bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
1543 FMODE_READ | FMODE_WRITE | FMODE_EXCL, device);
1545 drbd_err(device, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
1547 retcode = ERR_OPEN_DISK;
1550 nbc->backing_bdev = bdev;
1553 * meta_dev_idx >= 0: external fixed size, possibly multiple
1554 * drbd sharing one meta device. TODO in that case, paranoia
1555 * check that [md_bdev, meta_dev_idx] is not yet used by some
1556 * other drbd minor! (if you use drbd.conf + drbdadm, that
1557 * should check it for you already; but if you don't, or
1558 * someone fooled it, we need to double check here)
1560 bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
1561 FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1562 (new_disk_conf->meta_dev_idx < 0) ?
1563 (void *)device : (void *)drbd_m_holder);
1565 drbd_err(device, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
1567 retcode = ERR_OPEN_MD_DISK;
1570 nbc->md_bdev = bdev;
1572 if ((nbc->backing_bdev == nbc->md_bdev) !=
1573 (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1574 new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1575 retcode = ERR_MD_IDX_INVALID;
1579 resync_lru = lc_create("resync", drbd_bm_ext_cache,
1580 1, 61, sizeof(struct bm_extent),
1581 offsetof(struct bm_extent, lce));
1583 retcode = ERR_NOMEM;
1587 /* Read our meta data super block early.
1588 * This also sets other on-disk offsets. */
1589 retcode = drbd_md_read(device, nbc);
1590 if (retcode != NO_ERROR)
1593 if (new_disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
1594 new_disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
1595 if (new_disk_conf->al_extents > drbd_al_extents_max(nbc))
1596 new_disk_conf->al_extents = drbd_al_extents_max(nbc);
1598 if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
1599 drbd_err(device, "max capacity %llu smaller than disk size %llu\n",
1600 (unsigned long long) drbd_get_max_capacity(nbc),
1601 (unsigned long long) new_disk_conf->disk_size);
1602 retcode = ERR_DISK_TOO_SMALL;
1606 if (new_disk_conf->meta_dev_idx < 0) {
1607 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1608 /* at least one MB, otherwise it does not make sense */
1609 min_md_device_sectors = (2<<10);
1611 max_possible_sectors = DRBD_MAX_SECTORS;
1612 min_md_device_sectors = MD_128MB_SECT * (new_disk_conf->meta_dev_idx + 1);
1615 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1616 retcode = ERR_MD_DISK_TOO_SMALL;
1617 drbd_warn(device, "refusing attach: md-device too small, "
1618 "at least %llu sectors needed for this meta-disk type\n",
1619 (unsigned long long) min_md_device_sectors);
1623 /* Make sure the new disk is big enough
1624 * (we may currently be R_PRIMARY with no local disk...) */
1625 if (drbd_get_max_capacity(nbc) <
1626 drbd_get_capacity(device->this_bdev)) {
1627 retcode = ERR_DISK_TOO_SMALL;
1631 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1633 if (nbc->known_size > max_possible_sectors) {
1634 drbd_warn(device, "==> truncating very big lower level device "
1635 "to currently maximum possible %llu sectors <==\n",
1636 (unsigned long long) max_possible_sectors);
1637 if (new_disk_conf->meta_dev_idx >= 0)
1638 drbd_warn(device, "==>> using internal or flexible "
1639 "meta data may help <<==\n");
1642 drbd_suspend_io(device);
1643 /* also wait for the last barrier ack. */
1644 /* FIXME see also https://daiquiri.linbit/cgi-bin/bugzilla/show_bug.cgi?id=171
1645 * We need a way to either ignore barrier acks for barriers sent before a device
1646 * was attached, or a way to wait for all pending barrier acks to come in.
1647 * As barriers are counted per resource,
1648 * we'd need to suspend io on all devices of a resource.
1650 wait_event(device->misc_wait, !atomic_read(&device->ap_pending_cnt) || drbd_suspended(device));
1651 /* and for any other previously queued work */
1652 drbd_flush_workqueue(&first_peer_device(device)->connection->sender_work);
1654 rv = _drbd_request_state(device, NS(disk, D_ATTACHING), CS_VERBOSE);
1655 retcode = rv; /* FIXME: Type mismatch. */
1656 drbd_resume_io(device);
1657 if (rv < SS_SUCCESS)
1660 if (!get_ldev_if_state(device, D_ATTACHING))
1661 goto force_diskless;
1663 if (!device->bitmap) {
1664 if (drbd_bm_init(device)) {
1665 retcode = ERR_NOMEM;
1666 goto force_diskless_dec;
1670 if (device->state.conn < C_CONNECTED &&
1671 device->state.role == R_PRIMARY && device->ed_uuid &&
1672 (device->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1673 drbd_err(device, "Can only attach to data with current UUID=%016llX\n",
1674 (unsigned long long)device->ed_uuid);
1675 retcode = ERR_DATA_NOT_CURRENT;
1676 goto force_diskless_dec;
1679 /* Since we are diskless, fix the activity log first... */
1680 if (drbd_check_al_size(device, new_disk_conf)) {
1681 retcode = ERR_NOMEM;
1682 goto force_diskless_dec;
1685 /* Prevent shrinking of consistent devices ! */
1686 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1687 drbd_new_dev_size(device, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
1688 drbd_warn(device, "refusing to truncate a consistent device\n");
1689 retcode = ERR_DISK_TOO_SMALL;
1690 goto force_diskless_dec;
1693 /* Reset the "barriers don't work" bits here, then force meta data to
1694 * be written, to ensure we determine if barriers are supported. */
1695 if (new_disk_conf->md_flushes)
1696 clear_bit(MD_NO_FUA, &device->flags);
1698 set_bit(MD_NO_FUA, &device->flags);
1700 /* Point of no return reached.
1701 * Devices and memory are no longer released by error cleanup below.
1702 * now device takes over responsibility, and the state engine should
1703 * clean it up somewhere. */
1704 D_ASSERT(device, device->ldev == NULL);
1706 device->resync = resync_lru;
1707 device->rs_plan_s = new_plan;
1710 new_disk_conf = NULL;
1713 drbd_bump_write_ordering(first_peer_device(device)->connection, WO_bdev_flush);
1715 if (drbd_md_test_flag(device->ldev, MDF_CRASHED_PRIMARY))
1716 set_bit(CRASHED_PRIMARY, &device->flags);
1718 clear_bit(CRASHED_PRIMARY, &device->flags);
1720 if (drbd_md_test_flag(device->ldev, MDF_PRIMARY_IND) &&
1721 !(device->state.role == R_PRIMARY && device->resource->susp_nod))
1722 set_bit(CRASHED_PRIMARY, &device->flags);
1724 device->send_cnt = 0;
1725 device->recv_cnt = 0;
1726 device->read_cnt = 0;
1727 device->writ_cnt = 0;
1729 drbd_reconsider_max_bio_size(device);
1731 /* If I am currently not R_PRIMARY,
1732 * but meta data primary indicator is set,
1733 * I just now recover from a hard crash,
1734 * and have been R_PRIMARY before that crash.
1736 * Now, if I had no connection before that crash
1737 * (have been degraded R_PRIMARY), chances are that
1738 * I won't find my peer now either.
1740 * In that case, and _only_ in that case,
1741 * we use the degr-wfc-timeout instead of the default,
1742 * so we can automatically recover from a crash of a
1743 * degraded but active "cluster" after a certain timeout.
1745 clear_bit(USE_DEGR_WFC_T, &device->flags);
1746 if (device->state.role != R_PRIMARY &&
1747 drbd_md_test_flag(device->ldev, MDF_PRIMARY_IND) &&
1748 !drbd_md_test_flag(device->ldev, MDF_CONNECTED_IND))
1749 set_bit(USE_DEGR_WFC_T, &device->flags);
1751 dd = drbd_determine_dev_size(device, 0, NULL);
1752 if (dd <= DS_ERROR) {
1753 retcode = ERR_NOMEM_BITMAP;
1754 goto force_diskless_dec;
1755 } else if (dd == DS_GREW)
1756 set_bit(RESYNC_AFTER_NEG, &device->flags);
1758 if (drbd_md_test_flag(device->ldev, MDF_FULL_SYNC) ||
1759 (test_bit(CRASHED_PRIMARY, &device->flags) &&
1760 drbd_md_test_flag(device->ldev, MDF_AL_DISABLED))) {
1761 drbd_info(device, "Assuming that all blocks are out of sync "
1762 "(aka FullSync)\n");
1763 if (drbd_bitmap_io(device, &drbd_bmio_set_n_write,
1764 "set_n_write from attaching", BM_LOCKED_MASK)) {
1765 retcode = ERR_IO_MD_DISK;
1766 goto force_diskless_dec;
1769 if (drbd_bitmap_io(device, &drbd_bm_read,
1770 "read from attaching", BM_LOCKED_MASK)) {
1771 retcode = ERR_IO_MD_DISK;
1772 goto force_diskless_dec;
1776 if (_drbd_bm_total_weight(device) == drbd_bm_bits(device))
1777 drbd_suspend_al(device); /* IO is still suspended here... */
1779 spin_lock_irq(&device->resource->req_lock);
1780 os = drbd_read_state(device);
1782 /* If MDF_CONSISTENT is not set go into inconsistent state,
1783 otherwise investigate MDF_WasUpToDate...
1784 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1785 otherwise into D_CONSISTENT state.
1787 if (drbd_md_test_flag(device->ldev, MDF_CONSISTENT)) {
1788 if (drbd_md_test_flag(device->ldev, MDF_WAS_UP_TO_DATE))
1789 ns.disk = D_CONSISTENT;
1791 ns.disk = D_OUTDATED;
1793 ns.disk = D_INCONSISTENT;
1796 if (drbd_md_test_flag(device->ldev, MDF_PEER_OUT_DATED))
1797 ns.pdsk = D_OUTDATED;
1800 if (ns.disk == D_CONSISTENT &&
1801 (ns.pdsk == D_OUTDATED || rcu_dereference(device->ldev->disk_conf)->fencing == FP_DONT_CARE))
1802 ns.disk = D_UP_TO_DATE;
1804 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1805 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1806 this point, because drbd_request_state() modifies these
1809 if (rcu_dereference(device->ldev->disk_conf)->al_updates)
1810 device->ldev->md.flags &= ~MDF_AL_DISABLED;
1812 device->ldev->md.flags |= MDF_AL_DISABLED;
1816 /* In case we are C_CONNECTED postpone any decision on the new disk
1817 state after the negotiation phase. */
1818 if (device->state.conn == C_CONNECTED) {
1819 device->new_state_tmp.i = ns.i;
1821 ns.disk = D_NEGOTIATING;
1823 /* We expect to receive up-to-date UUIDs soon.
1824 To avoid a race in receive_state, free p_uuid while
1825 holding req_lock. I.e. atomic with the state change */
1826 kfree(device->p_uuid);
1827 device->p_uuid = NULL;
1830 rv = _drbd_set_state(device, ns, CS_VERBOSE, NULL);
1831 spin_unlock_irq(&device->resource->req_lock);
1833 if (rv < SS_SUCCESS)
1834 goto force_diskless_dec;
1836 mod_timer(&device->request_timer, jiffies + HZ);
1838 if (device->state.role == R_PRIMARY)
1839 device->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1841 device->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1843 drbd_md_mark_dirty(device);
1844 drbd_md_sync(device);
1846 kobject_uevent(&disk_to_dev(device->vdisk)->kobj, KOBJ_CHANGE);
1848 conn_reconfig_done(first_peer_device(device)->connection);
1849 mutex_unlock(&adm_ctx.resource->adm_mutex);
1850 drbd_adm_finish(&adm_ctx, info, retcode);
1856 drbd_force_state(device, NS(disk, D_DISKLESS));
1857 drbd_md_sync(device);
1859 conn_reconfig_done(first_peer_device(device)->connection);
1861 if (nbc->backing_bdev)
1862 blkdev_put(nbc->backing_bdev,
1863 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1865 blkdev_put(nbc->md_bdev,
1866 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1869 kfree(new_disk_conf);
1870 lc_destroy(resync_lru);
1872 mutex_unlock(&adm_ctx.resource->adm_mutex);
1874 drbd_adm_finish(&adm_ctx, info, retcode);
1878 static int adm_detach(struct drbd_device *device, int force)
1880 enum drbd_state_rv retcode;
1884 set_bit(FORCE_DETACH, &device->flags);
1885 drbd_force_state(device, NS(disk, D_FAILED));
1886 retcode = SS_SUCCESS;
1890 drbd_suspend_io(device); /* so no-one is stuck in drbd_al_begin_io */
1891 drbd_md_get_buffer(device); /* make sure there is no in-flight meta-data IO */
1892 retcode = drbd_request_state(device, NS(disk, D_FAILED));
1893 drbd_md_put_buffer(device);
1894 /* D_FAILED will transition to DISKLESS. */
1895 ret = wait_event_interruptible(device->misc_wait,
1896 device->state.disk != D_FAILED);
1897 drbd_resume_io(device);
1898 if ((int)retcode == (int)SS_IS_DISKLESS)
1899 retcode = SS_NOTHING_TO_DO;
1906 /* Detaching the disk is a process in multiple stages. First we need to lock
1907 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1908 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1909 * internal references as well.
1910 * Only then we have finally detached. */
1911 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
1913 struct drbd_config_context adm_ctx;
1914 enum drbd_ret_code retcode;
1915 struct detach_parms parms = { };
1918 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
1919 if (!adm_ctx.reply_skb)
1921 if (retcode != NO_ERROR)
1924 if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
1925 err = detach_parms_from_attrs(&parms, info);
1927 retcode = ERR_MANDATORY_TAG;
1928 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
1933 mutex_lock(&adm_ctx.resource->adm_mutex);
1934 retcode = adm_detach(adm_ctx.device, parms.force_detach);
1935 mutex_unlock(&adm_ctx.resource->adm_mutex);
1937 drbd_adm_finish(&adm_ctx, info, retcode);
1941 static bool conn_resync_running(struct drbd_connection *connection)
1943 struct drbd_peer_device *peer_device;
1948 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
1949 struct drbd_device *device = peer_device->device;
1950 if (device->state.conn == C_SYNC_SOURCE ||
1951 device->state.conn == C_SYNC_TARGET ||
1952 device->state.conn == C_PAUSED_SYNC_S ||
1953 device->state.conn == C_PAUSED_SYNC_T) {
1963 static bool conn_ov_running(struct drbd_connection *connection)
1965 struct drbd_peer_device *peer_device;
1970 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
1971 struct drbd_device *device = peer_device->device;
1972 if (device->state.conn == C_VERIFY_S ||
1973 device->state.conn == C_VERIFY_T) {
1983 static enum drbd_ret_code
1984 _check_net_options(struct drbd_connection *connection, struct net_conf *old_net_conf, struct net_conf *new_net_conf)
1986 struct drbd_peer_device *peer_device;
1989 if (old_net_conf && connection->cstate == C_WF_REPORT_PARAMS && connection->agreed_pro_version < 100) {
1990 if (new_net_conf->wire_protocol != old_net_conf->wire_protocol)
1991 return ERR_NEED_APV_100;
1993 if (new_net_conf->two_primaries != old_net_conf->two_primaries)
1994 return ERR_NEED_APV_100;
1996 if (strcmp(new_net_conf->integrity_alg, old_net_conf->integrity_alg))
1997 return ERR_NEED_APV_100;
2000 if (!new_net_conf->two_primaries &&
2001 conn_highest_role(connection) == R_PRIMARY &&
2002 conn_highest_peer(connection) == R_PRIMARY)
2003 return ERR_NEED_ALLOW_TWO_PRI;
2005 if (new_net_conf->two_primaries &&
2006 (new_net_conf->wire_protocol != DRBD_PROT_C))
2007 return ERR_NOT_PROTO_C;
2009 idr_for_each_entry(&connection->peer_devices, peer_device, i) {
2010 struct drbd_device *device = peer_device->device;
2011 if (get_ldev(device)) {
2012 enum drbd_fencing_p fp = rcu_dereference(device->ldev->disk_conf)->fencing;
2014 if (new_net_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
2015 return ERR_STONITH_AND_PROT_A;
2017 if (device->state.role == R_PRIMARY && new_net_conf->discard_my_data)
2018 return ERR_DISCARD_IMPOSSIBLE;
2021 if (new_net_conf->on_congestion != OC_BLOCK && new_net_conf->wire_protocol != DRBD_PROT_A)
2022 return ERR_CONG_NOT_PROTO_A;
2027 static enum drbd_ret_code
2028 check_net_options(struct drbd_connection *connection, struct net_conf *new_net_conf)
2030 static enum drbd_ret_code rv;
2031 struct drbd_peer_device *peer_device;
2035 rv = _check_net_options(connection, rcu_dereference(connection->net_conf), new_net_conf);
2038 /* connection->volumes protected by genl_lock() here */
2039 idr_for_each_entry(&connection->peer_devices, peer_device, i) {
2040 struct drbd_device *device = peer_device->device;
2041 if (!device->bitmap) {
2042 if (drbd_bm_init(device))
2051 struct crypto_hash *verify_tfm;
2052 struct crypto_hash *csums_tfm;
2053 struct crypto_hash *cram_hmac_tfm;
2054 struct crypto_hash *integrity_tfm;
2058 alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
2063 *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
2072 static enum drbd_ret_code
2073 alloc_crypto(struct crypto *crypto, struct net_conf *new_net_conf)
2075 char hmac_name[CRYPTO_MAX_ALG_NAME];
2076 enum drbd_ret_code rv;
2078 rv = alloc_hash(&crypto->csums_tfm, new_net_conf->csums_alg,
2082 rv = alloc_hash(&crypto->verify_tfm, new_net_conf->verify_alg,
2086 rv = alloc_hash(&crypto->integrity_tfm, new_net_conf->integrity_alg,
2090 if (new_net_conf->cram_hmac_alg[0] != 0) {
2091 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
2092 new_net_conf->cram_hmac_alg);
2094 rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
2101 static void free_crypto(struct crypto *crypto)
2103 crypto_free_hash(crypto->cram_hmac_tfm);
2104 crypto_free_hash(crypto->integrity_tfm);
2105 crypto_free_hash(crypto->csums_tfm);
2106 crypto_free_hash(crypto->verify_tfm);
2109 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
2111 struct drbd_config_context adm_ctx;
2112 enum drbd_ret_code retcode;
2113 struct drbd_connection *connection;
2114 struct net_conf *old_net_conf, *new_net_conf = NULL;
2116 int ovr; /* online verify running */
2117 int rsr; /* re-sync running */
2118 struct crypto crypto = { };
2120 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_CONNECTION);
2121 if (!adm_ctx.reply_skb)
2123 if (retcode != NO_ERROR)
2126 connection = adm_ctx.connection;
2127 mutex_lock(&adm_ctx.resource->adm_mutex);
2129 new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
2130 if (!new_net_conf) {
2131 retcode = ERR_NOMEM;
2135 conn_reconfig_start(connection);
2137 mutex_lock(&connection->data.mutex);
2138 mutex_lock(&connection->resource->conf_update);
2139 old_net_conf = connection->net_conf;
2141 if (!old_net_conf) {
2142 drbd_msg_put_info(adm_ctx.reply_skb, "net conf missing, try connect");
2143 retcode = ERR_INVALID_REQUEST;
2147 *new_net_conf = *old_net_conf;
2148 if (should_set_defaults(info))
2149 set_net_conf_defaults(new_net_conf);
2151 err = net_conf_from_attrs_for_change(new_net_conf, info);
2152 if (err && err != -ENOMSG) {
2153 retcode = ERR_MANDATORY_TAG;
2154 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2158 retcode = check_net_options(connection, new_net_conf);
2159 if (retcode != NO_ERROR)
2162 /* re-sync running */
2163 rsr = conn_resync_running(connection);
2164 if (rsr && strcmp(new_net_conf->csums_alg, old_net_conf->csums_alg)) {
2165 retcode = ERR_CSUMS_RESYNC_RUNNING;
2169 /* online verify running */
2170 ovr = conn_ov_running(connection);
2171 if (ovr && strcmp(new_net_conf->verify_alg, old_net_conf->verify_alg)) {
2172 retcode = ERR_VERIFY_RUNNING;
2176 retcode = alloc_crypto(&crypto, new_net_conf);
2177 if (retcode != NO_ERROR)
2180 rcu_assign_pointer(connection->net_conf, new_net_conf);
2183 crypto_free_hash(connection->csums_tfm);
2184 connection->csums_tfm = crypto.csums_tfm;
2185 crypto.csums_tfm = NULL;
2188 crypto_free_hash(connection->verify_tfm);
2189 connection->verify_tfm = crypto.verify_tfm;
2190 crypto.verify_tfm = NULL;
2193 crypto_free_hash(connection->integrity_tfm);
2194 connection->integrity_tfm = crypto.integrity_tfm;
2195 if (connection->cstate >= C_WF_REPORT_PARAMS && connection->agreed_pro_version >= 100)
2196 /* Do this without trying to take connection->data.mutex again. */
2197 __drbd_send_protocol(connection, P_PROTOCOL_UPDATE);
2199 crypto_free_hash(connection->cram_hmac_tfm);
2200 connection->cram_hmac_tfm = crypto.cram_hmac_tfm;
2202 mutex_unlock(&connection->resource->conf_update);
2203 mutex_unlock(&connection->data.mutex);
2205 kfree(old_net_conf);
2207 if (connection->cstate >= C_WF_REPORT_PARAMS) {
2208 struct drbd_peer_device *peer_device;
2211 idr_for_each_entry(&connection->peer_devices, peer_device, vnr)
2212 drbd_send_sync_param(peer_device);
2218 mutex_unlock(&connection->resource->conf_update);
2219 mutex_unlock(&connection->data.mutex);
2220 free_crypto(&crypto);
2221 kfree(new_net_conf);
2223 conn_reconfig_done(connection);
2225 mutex_unlock(&adm_ctx.resource->adm_mutex);
2227 drbd_adm_finish(&adm_ctx, info, retcode);
2231 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
2233 struct drbd_config_context adm_ctx;
2234 struct drbd_peer_device *peer_device;
2235 struct net_conf *old_net_conf, *new_net_conf = NULL;
2236 struct crypto crypto = { };
2237 struct drbd_resource *resource;
2238 struct drbd_connection *connection;
2239 enum drbd_ret_code retcode;
2243 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
2245 if (!adm_ctx.reply_skb)
2247 if (retcode != NO_ERROR)
2249 if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
2250 drbd_msg_put_info(adm_ctx.reply_skb, "connection endpoint(s) missing");
2251 retcode = ERR_INVALID_REQUEST;
2255 /* No need for _rcu here. All reconfiguration is
2256 * strictly serialized on genl_lock(). We are protected against
2257 * concurrent reconfiguration/addition/deletion */
2258 for_each_resource(resource, &drbd_resources) {
2259 for_each_connection(connection, resource) {
2260 if (nla_len(adm_ctx.my_addr) == connection->my_addr_len &&
2261 !memcmp(nla_data(adm_ctx.my_addr), &connection->my_addr,
2262 connection->my_addr_len)) {
2263 retcode = ERR_LOCAL_ADDR;
2267 if (nla_len(adm_ctx.peer_addr) == connection->peer_addr_len &&
2268 !memcmp(nla_data(adm_ctx.peer_addr), &connection->peer_addr,
2269 connection->peer_addr_len)) {
2270 retcode = ERR_PEER_ADDR;
2276 mutex_lock(&adm_ctx.resource->adm_mutex);
2277 connection = first_connection(adm_ctx.resource);
2278 conn_reconfig_start(connection);
2280 if (connection->cstate > C_STANDALONE) {
2281 retcode = ERR_NET_CONFIGURED;
2285 /* allocation not in the IO path, drbdsetup / netlink process context */
2286 new_net_conf = kzalloc(sizeof(*new_net_conf), GFP_KERNEL);
2287 if (!new_net_conf) {
2288 retcode = ERR_NOMEM;
2292 set_net_conf_defaults(new_net_conf);
2294 err = net_conf_from_attrs(new_net_conf, info);
2295 if (err && err != -ENOMSG) {
2296 retcode = ERR_MANDATORY_TAG;
2297 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2301 retcode = check_net_options(connection, new_net_conf);
2302 if (retcode != NO_ERROR)
2305 retcode = alloc_crypto(&crypto, new_net_conf);
2306 if (retcode != NO_ERROR)
2309 ((char *)new_net_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2311 drbd_flush_workqueue(&connection->sender_work);
2313 mutex_lock(&adm_ctx.resource->conf_update);
2314 old_net_conf = connection->net_conf;
2316 retcode = ERR_NET_CONFIGURED;
2317 mutex_unlock(&adm_ctx.resource->conf_update);
2320 rcu_assign_pointer(connection->net_conf, new_net_conf);
2322 conn_free_crypto(connection);
2323 connection->cram_hmac_tfm = crypto.cram_hmac_tfm;
2324 connection->integrity_tfm = crypto.integrity_tfm;
2325 connection->csums_tfm = crypto.csums_tfm;
2326 connection->verify_tfm = crypto.verify_tfm;
2328 connection->my_addr_len = nla_len(adm_ctx.my_addr);
2329 memcpy(&connection->my_addr, nla_data(adm_ctx.my_addr), connection->my_addr_len);
2330 connection->peer_addr_len = nla_len(adm_ctx.peer_addr);
2331 memcpy(&connection->peer_addr, nla_data(adm_ctx.peer_addr), connection->peer_addr_len);
2333 mutex_unlock(&adm_ctx.resource->conf_update);
2336 idr_for_each_entry(&connection->peer_devices, peer_device, i) {
2337 struct drbd_device *device = peer_device->device;
2338 device->send_cnt = 0;
2339 device->recv_cnt = 0;
2343 retcode = conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2345 conn_reconfig_done(connection);
2346 mutex_unlock(&adm_ctx.resource->adm_mutex);
2347 drbd_adm_finish(&adm_ctx, info, retcode);
2351 free_crypto(&crypto);
2352 kfree(new_net_conf);
2354 conn_reconfig_done(connection);
2355 mutex_unlock(&adm_ctx.resource->adm_mutex);
2357 drbd_adm_finish(&adm_ctx, info, retcode);
2361 static enum drbd_state_rv conn_try_disconnect(struct drbd_connection *connection, bool force)
2363 enum drbd_state_rv rv;
2365 rv = conn_request_state(connection, NS(conn, C_DISCONNECTING),
2366 force ? CS_HARD : 0);
2369 case SS_NOTHING_TO_DO:
2371 case SS_ALREADY_STANDALONE:
2373 case SS_PRIMARY_NOP:
2374 /* Our state checking code wants to see the peer outdated. */
2375 rv = conn_request_state(connection, NS2(conn, C_DISCONNECTING, pdsk, D_OUTDATED), 0);
2377 if (rv == SS_OUTDATE_WO_CONN) /* lost connection before graceful disconnect succeeded */
2378 rv = conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_VERBOSE);
2381 case SS_CW_FAILED_BY_PEER:
2382 /* The peer probably wants to see us outdated. */
2383 rv = conn_request_state(connection, NS2(conn, C_DISCONNECTING,
2384 disk, D_OUTDATED), 0);
2385 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2386 rv = conn_request_state(connection, NS(conn, C_DISCONNECTING),
2391 /* no special handling necessary */
2394 if (rv >= SS_SUCCESS) {
2395 enum drbd_state_rv rv2;
2396 /* No one else can reconfigure the network while I am here.
2397 * The state handling only uses drbd_thread_stop_nowait(),
2398 * we want to really wait here until the receiver is no more.
2400 drbd_thread_stop(&connection->receiver);
2402 /* Race breaker. This additional state change request may be
2403 * necessary, if this was a forced disconnect during a receiver
2404 * restart. We may have "killed" the receiver thread just
2405 * after drbd_receiver() returned. Typically, we should be
2406 * C_STANDALONE already, now, and this becomes a no-op.
2408 rv2 = conn_request_state(connection, NS(conn, C_STANDALONE),
2409 CS_VERBOSE | CS_HARD);
2410 if (rv2 < SS_SUCCESS)
2411 drbd_err(connection,
2412 "unexpected rv2=%d in conn_try_disconnect()\n",
2418 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2420 struct drbd_config_context adm_ctx;
2421 struct disconnect_parms parms;
2422 struct drbd_connection *connection;
2423 enum drbd_state_rv rv;
2424 enum drbd_ret_code retcode;
2427 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_CONNECTION);
2428 if (!adm_ctx.reply_skb)
2430 if (retcode != NO_ERROR)
2433 connection = adm_ctx.connection;
2434 memset(&parms, 0, sizeof(parms));
2435 if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2436 err = disconnect_parms_from_attrs(&parms, info);
2438 retcode = ERR_MANDATORY_TAG;
2439 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2444 mutex_lock(&adm_ctx.resource->adm_mutex);
2445 rv = conn_try_disconnect(connection, parms.force_disconnect);
2446 if (rv < SS_SUCCESS)
2447 retcode = rv; /* FIXME: Type mismatch. */
2450 mutex_unlock(&adm_ctx.resource->adm_mutex);
2452 drbd_adm_finish(&adm_ctx, info, retcode);
2456 void resync_after_online_grow(struct drbd_device *device)
2458 int iass; /* I am sync source */
2460 drbd_info(device, "Resync of new storage after online grow\n");
2461 if (device->state.role != device->state.peer)
2462 iass = (device->state.role == R_PRIMARY);
2464 iass = test_bit(RESOLVE_CONFLICTS, &first_peer_device(device)->connection->flags);
2467 drbd_start_resync(device, C_SYNC_SOURCE);
2469 _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2472 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2474 struct drbd_config_context adm_ctx;
2475 struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
2476 struct resize_parms rs;
2477 struct drbd_device *device;
2478 enum drbd_ret_code retcode;
2479 enum determine_dev_size dd;
2480 bool change_al_layout = false;
2481 enum dds_flags ddsf;
2485 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2486 if (!adm_ctx.reply_skb)
2488 if (retcode != NO_ERROR)
2491 mutex_lock(&adm_ctx.resource->adm_mutex);
2492 device = adm_ctx.device;
2493 if (!get_ldev(device)) {
2494 retcode = ERR_NO_DISK;
2498 memset(&rs, 0, sizeof(struct resize_parms));
2499 rs.al_stripes = device->ldev->md.al_stripes;
2500 rs.al_stripe_size = device->ldev->md.al_stripe_size_4k * 4;
2501 if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2502 err = resize_parms_from_attrs(&rs, info);
2504 retcode = ERR_MANDATORY_TAG;
2505 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2510 if (device->state.conn > C_CONNECTED) {
2511 retcode = ERR_RESIZE_RESYNC;
2515 if (device->state.role == R_SECONDARY &&
2516 device->state.peer == R_SECONDARY) {
2517 retcode = ERR_NO_PRIMARY;
2521 if (rs.no_resync && first_peer_device(device)->connection->agreed_pro_version < 93) {
2522 retcode = ERR_NEED_APV_93;
2527 u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
2529 if (u_size != (sector_t)rs.resize_size) {
2530 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2531 if (!new_disk_conf) {
2532 retcode = ERR_NOMEM;
2537 if (device->ldev->md.al_stripes != rs.al_stripes ||
2538 device->ldev->md.al_stripe_size_4k != rs.al_stripe_size / 4) {
2539 u32 al_size_k = rs.al_stripes * rs.al_stripe_size;
2541 if (al_size_k > (16 * 1024 * 1024)) {
2542 retcode = ERR_MD_LAYOUT_TOO_BIG;
2546 if (al_size_k < MD_32kB_SECT/2) {
2547 retcode = ERR_MD_LAYOUT_TOO_SMALL;
2551 if (device->state.conn != C_CONNECTED && !rs.resize_force) {
2552 retcode = ERR_MD_LAYOUT_CONNECTED;
2556 change_al_layout = true;
2559 if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev))
2560 device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev);
2562 if (new_disk_conf) {
2563 mutex_lock(&device->resource->conf_update);
2564 old_disk_conf = device->ldev->disk_conf;
2565 *new_disk_conf = *old_disk_conf;
2566 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2567 rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
2568 mutex_unlock(&device->resource->conf_update);
2570 kfree(old_disk_conf);
2573 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2574 dd = drbd_determine_dev_size(device, ddsf, change_al_layout ? &rs : NULL);
2575 drbd_md_sync(device);
2577 if (dd == DS_ERROR) {
2578 retcode = ERR_NOMEM_BITMAP;
2580 } else if (dd == DS_ERROR_SPACE_MD) {
2581 retcode = ERR_MD_LAYOUT_NO_FIT;
2583 } else if (dd == DS_ERROR_SHRINK) {
2584 retcode = ERR_IMPLICIT_SHRINK;
2588 if (device->state.conn == C_CONNECTED) {
2590 set_bit(RESIZE_PENDING, &device->flags);
2592 drbd_send_uuids(first_peer_device(device));
2593 drbd_send_sizes(first_peer_device(device), 1, ddsf);
2597 mutex_unlock(&adm_ctx.resource->adm_mutex);
2599 drbd_adm_finish(&adm_ctx, info, retcode);
2607 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2609 struct drbd_config_context adm_ctx;
2610 enum drbd_ret_code retcode;
2611 struct res_opts res_opts;
2614 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
2615 if (!adm_ctx.reply_skb)
2617 if (retcode != NO_ERROR)
2620 res_opts = adm_ctx.resource->res_opts;
2621 if (should_set_defaults(info))
2622 set_res_opts_defaults(&res_opts);
2624 err = res_opts_from_attrs(&res_opts, info);
2625 if (err && err != -ENOMSG) {
2626 retcode = ERR_MANDATORY_TAG;
2627 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2631 mutex_lock(&adm_ctx.resource->adm_mutex);
2632 err = set_resource_options(adm_ctx.resource, &res_opts);
2634 retcode = ERR_INVALID_REQUEST;
2636 retcode = ERR_NOMEM;
2638 mutex_unlock(&adm_ctx.resource->adm_mutex);
2641 drbd_adm_finish(&adm_ctx, info, retcode);
2645 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2647 struct drbd_config_context adm_ctx;
2648 struct drbd_device *device;
2649 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2651 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2652 if (!adm_ctx.reply_skb)
2654 if (retcode != NO_ERROR)
2657 mutex_lock(&adm_ctx.resource->adm_mutex);
2658 device = adm_ctx.device;
2660 /* If there is still bitmap IO pending, probably because of a previous
2661 * resync just being finished, wait for it before requesting a new resync.
2662 * Also wait for it's after_state_ch(). */
2663 drbd_suspend_io(device);
2664 wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
2665 drbd_flush_workqueue(&first_peer_device(device)->connection->sender_work);
2667 /* If we happen to be C_STANDALONE R_SECONDARY, just change to
2668 * D_INCONSISTENT, and set all bits in the bitmap. Otherwise,
2669 * try to start a resync handshake as sync target for full sync.
2671 if (device->state.conn == C_STANDALONE && device->state.role == R_SECONDARY) {
2672 retcode = drbd_request_state(device, NS(disk, D_INCONSISTENT));
2673 if (retcode >= SS_SUCCESS) {
2674 if (drbd_bitmap_io(device, &drbd_bmio_set_n_write,
2675 "set_n_write from invalidate", BM_LOCKED_MASK))
2676 retcode = ERR_IO_MD_DISK;
2679 retcode = drbd_request_state(device, NS(conn, C_STARTING_SYNC_T));
2680 drbd_resume_io(device);
2681 mutex_unlock(&adm_ctx.resource->adm_mutex);
2683 drbd_adm_finish(&adm_ctx, info, retcode);
2687 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2688 union drbd_state mask, union drbd_state val)
2690 struct drbd_config_context adm_ctx;
2691 enum drbd_ret_code retcode;
2693 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2694 if (!adm_ctx.reply_skb)
2696 if (retcode != NO_ERROR)
2699 mutex_lock(&adm_ctx.resource->adm_mutex);
2700 retcode = drbd_request_state(adm_ctx.device, mask, val);
2701 mutex_unlock(&adm_ctx.resource->adm_mutex);
2703 drbd_adm_finish(&adm_ctx, info, retcode);
2707 static int drbd_bmio_set_susp_al(struct drbd_device *device)
2711 rv = drbd_bmio_set_n_write(device);
2712 drbd_suspend_al(device);
2716 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
2718 struct drbd_config_context adm_ctx;
2719 int retcode; /* drbd_ret_code, drbd_state_rv */
2720 struct drbd_device *device;
2722 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2723 if (!adm_ctx.reply_skb)
2725 if (retcode != NO_ERROR)
2728 mutex_lock(&adm_ctx.resource->adm_mutex);
2729 device = adm_ctx.device;
2731 /* If there is still bitmap IO pending, probably because of a previous
2732 * resync just being finished, wait for it before requesting a new resync.
2733 * Also wait for it's after_state_ch(). */
2734 drbd_suspend_io(device);
2735 wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
2736 drbd_flush_workqueue(&first_peer_device(device)->connection->sender_work);
2738 /* If we happen to be C_STANDALONE R_PRIMARY, just set all bits
2739 * in the bitmap. Otherwise, try to start a resync handshake
2740 * as sync source for full sync.
2742 if (device->state.conn == C_STANDALONE && device->state.role == R_PRIMARY) {
2743 /* The peer will get a resync upon connect anyways. Just make that
2744 into a full resync. */
2745 retcode = drbd_request_state(device, NS(pdsk, D_INCONSISTENT));
2746 if (retcode >= SS_SUCCESS) {
2747 if (drbd_bitmap_io(device, &drbd_bmio_set_susp_al,
2748 "set_n_write from invalidate_peer",
2749 BM_LOCKED_SET_ALLOWED))
2750 retcode = ERR_IO_MD_DISK;
2753 retcode = drbd_request_state(device, NS(conn, C_STARTING_SYNC_S));
2754 drbd_resume_io(device);
2755 mutex_unlock(&adm_ctx.resource->adm_mutex);
2757 drbd_adm_finish(&adm_ctx, info, retcode);
2761 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2763 struct drbd_config_context adm_ctx;
2764 enum drbd_ret_code retcode;
2766 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2767 if (!adm_ctx.reply_skb)
2769 if (retcode != NO_ERROR)
2772 mutex_lock(&adm_ctx.resource->adm_mutex);
2773 if (drbd_request_state(adm_ctx.device, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2774 retcode = ERR_PAUSE_IS_SET;
2775 mutex_unlock(&adm_ctx.resource->adm_mutex);
2777 drbd_adm_finish(&adm_ctx, info, retcode);
2781 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
2783 struct drbd_config_context adm_ctx;
2784 union drbd_dev_state s;
2785 enum drbd_ret_code retcode;
2787 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2788 if (!adm_ctx.reply_skb)
2790 if (retcode != NO_ERROR)
2793 mutex_lock(&adm_ctx.resource->adm_mutex);
2794 if (drbd_request_state(adm_ctx.device, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2795 s = adm_ctx.device->state;
2796 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2797 retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2798 s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2800 retcode = ERR_PAUSE_IS_CLEAR;
2803 mutex_unlock(&adm_ctx.resource->adm_mutex);
2805 drbd_adm_finish(&adm_ctx, info, retcode);
2809 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
2811 return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
2814 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
2816 struct drbd_config_context adm_ctx;
2817 struct drbd_device *device;
2818 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2820 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2821 if (!adm_ctx.reply_skb)
2823 if (retcode != NO_ERROR)
2826 mutex_lock(&adm_ctx.resource->adm_mutex);
2827 device = adm_ctx.device;
2828 if (test_bit(NEW_CUR_UUID, &device->flags)) {
2829 drbd_uuid_new_current(device);
2830 clear_bit(NEW_CUR_UUID, &device->flags);
2832 drbd_suspend_io(device);
2833 retcode = drbd_request_state(device, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2834 if (retcode == SS_SUCCESS) {
2835 if (device->state.conn < C_CONNECTED)
2836 tl_clear(first_peer_device(device)->connection);
2837 if (device->state.disk == D_DISKLESS || device->state.disk == D_FAILED)
2838 tl_restart(first_peer_device(device)->connection, FAIL_FROZEN_DISK_IO);
2840 drbd_resume_io(device);
2841 mutex_unlock(&adm_ctx.resource->adm_mutex);
2843 drbd_adm_finish(&adm_ctx, info, retcode);
2847 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
2849 return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
2852 static int nla_put_drbd_cfg_context(struct sk_buff *skb,
2853 struct drbd_resource *resource,
2854 struct drbd_connection *connection,
2855 struct drbd_device *device)
2858 nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2860 goto nla_put_failure;
2862 nla_put_u32(skb, T_ctx_volume, device->vnr))
2863 goto nla_put_failure;
2864 if (nla_put_string(skb, T_ctx_resource_name, resource->name))
2865 goto nla_put_failure;
2867 if (connection->my_addr_len &&
2868 nla_put(skb, T_ctx_my_addr, connection->my_addr_len, &connection->my_addr))
2869 goto nla_put_failure;
2870 if (connection->peer_addr_len &&
2871 nla_put(skb, T_ctx_peer_addr, connection->peer_addr_len, &connection->peer_addr))
2872 goto nla_put_failure;
2874 nla_nest_end(skb, nla);
2879 nla_nest_cancel(skb, nla);
2884 * Return the connection of @resource if @resource has exactly one connection.
2886 static struct drbd_connection *the_only_connection(struct drbd_resource *resource)
2888 struct list_head *connections = &resource->connections;
2890 if (list_empty(connections) || connections->next->next != connections)
2892 return list_first_entry(&resource->connections, struct drbd_connection, connections);
2895 int nla_put_status_info(struct sk_buff *skb, struct drbd_device *device,
2896 const struct sib_info *sib)
2898 struct drbd_resource *resource = device->resource;
2899 struct state_info *si = NULL; /* for sizeof(si->member); */
2903 int exclude_sensitive;
2905 /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2906 * to. So we better exclude_sensitive information.
2908 * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2909 * in the context of the requesting user process. Exclude sensitive
2910 * information, unless current has superuser.
2912 * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2913 * relies on the current implementation of netlink_dump(), which
2914 * executes the dump callback successively from netlink_recvmsg(),
2915 * always in the context of the receiving process */
2916 exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2918 got_ldev = get_ldev(device);
2920 /* We need to add connection name and volume number information still.
2921 * Minor number is in drbd_genlmsghdr. */
2922 if (nla_put_drbd_cfg_context(skb, resource, the_only_connection(resource), device))
2923 goto nla_put_failure;
2925 if (res_opts_to_skb(skb, &device->resource->res_opts, exclude_sensitive))
2926 goto nla_put_failure;
2930 struct disk_conf *disk_conf;
2932 disk_conf = rcu_dereference(device->ldev->disk_conf);
2933 err = disk_conf_to_skb(skb, disk_conf, exclude_sensitive);
2936 struct net_conf *nc;
2938 nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
2940 err = net_conf_to_skb(skb, nc, exclude_sensitive);
2944 goto nla_put_failure;
2946 nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2948 goto nla_put_failure;
2949 if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
2950 nla_put_u32(skb, T_current_state, device->state.i) ||
2951 nla_put_u64(skb, T_ed_uuid, device->ed_uuid) ||
2952 nla_put_u64(skb, T_capacity, drbd_get_capacity(device->this_bdev)) ||
2953 nla_put_u64(skb, T_send_cnt, device->send_cnt) ||
2954 nla_put_u64(skb, T_recv_cnt, device->recv_cnt) ||
2955 nla_put_u64(skb, T_read_cnt, device->read_cnt) ||
2956 nla_put_u64(skb, T_writ_cnt, device->writ_cnt) ||
2957 nla_put_u64(skb, T_al_writ_cnt, device->al_writ_cnt) ||
2958 nla_put_u64(skb, T_bm_writ_cnt, device->bm_writ_cnt) ||
2959 nla_put_u32(skb, T_ap_bio_cnt, atomic_read(&device->ap_bio_cnt)) ||
2960 nla_put_u32(skb, T_ap_pending_cnt, atomic_read(&device->ap_pending_cnt)) ||
2961 nla_put_u32(skb, T_rs_pending_cnt, atomic_read(&device->rs_pending_cnt)))
2962 goto nla_put_failure;
2967 spin_lock_irq(&device->ldev->md.uuid_lock);
2968 err = nla_put(skb, T_uuids, sizeof(si->uuids), device->ldev->md.uuid);
2969 spin_unlock_irq(&device->ldev->md.uuid_lock);
2972 goto nla_put_failure;
2974 if (nla_put_u32(skb, T_disk_flags, device->ldev->md.flags) ||
2975 nla_put_u64(skb, T_bits_total, drbd_bm_bits(device)) ||
2976 nla_put_u64(skb, T_bits_oos, drbd_bm_total_weight(device)))
2977 goto nla_put_failure;
2978 if (C_SYNC_SOURCE <= device->state.conn &&
2979 C_PAUSED_SYNC_T >= device->state.conn) {
2980 if (nla_put_u64(skb, T_bits_rs_total, device->rs_total) ||
2981 nla_put_u64(skb, T_bits_rs_failed, device->rs_failed))
2982 goto nla_put_failure;
2987 switch(sib->sib_reason) {
2988 case SIB_SYNC_PROGRESS:
2989 case SIB_GET_STATUS_REPLY:
2991 case SIB_STATE_CHANGE:
2992 if (nla_put_u32(skb, T_prev_state, sib->os.i) ||
2993 nla_put_u32(skb, T_new_state, sib->ns.i))
2994 goto nla_put_failure;
2996 case SIB_HELPER_POST:
2997 if (nla_put_u32(skb, T_helper_exit_code,
2998 sib->helper_exit_code))
2999 goto nla_put_failure;
3001 case SIB_HELPER_PRE:
3002 if (nla_put_string(skb, T_helper, sib->helper_name))
3003 goto nla_put_failure;
3007 nla_nest_end(skb, nla);
3017 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
3019 struct drbd_config_context adm_ctx;
3020 enum drbd_ret_code retcode;
3023 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3024 if (!adm_ctx.reply_skb)
3026 if (retcode != NO_ERROR)
3029 err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.device, NULL);
3031 nlmsg_free(adm_ctx.reply_skb);
3035 drbd_adm_finish(&adm_ctx, info, retcode);
3039 static int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
3041 struct drbd_device *device;
3042 struct drbd_genlmsghdr *dh;
3043 struct drbd_resource *pos = (struct drbd_resource *)cb->args[0];
3044 struct drbd_resource *resource = NULL;
3045 struct drbd_resource *tmp;
3046 unsigned volume = cb->args[1];
3048 /* Open coded, deferred, iteration:
3049 * for_each_resource_safe(resource, tmp, &drbd_resources) {
3050 * connection = "first connection of resource or undefined";
3051 * idr_for_each_entry(&resource->devices, device, i) {
3055 * where resource is cb->args[0];
3056 * and i is cb->args[1];
3058 * cb->args[2] indicates if we shall loop over all resources,
3059 * or just dump all volumes of a single resource.
3061 * This may miss entries inserted after this dump started,
3062 * or entries deleted before they are reached.
3064 * We need to make sure the device won't disappear while
3065 * we are looking at it, and revalidate our iterators
3066 * on each iteration.
3069 /* synchronize with conn_create()/drbd_destroy_connection() */
3071 /* revalidate iterator position */
3072 for_each_resource_rcu(tmp, &drbd_resources) {
3074 /* first iteration */
3086 device = idr_get_next(&resource->devices, &volume);
3088 /* No more volumes to dump on this resource.
3089 * Advance resource iterator. */
3090 pos = list_entry_rcu(resource->resources.next,
3091 struct drbd_resource, resources);
3092 /* Did we dump any volume of this resource yet? */
3094 /* If we reached the end of the list,
3095 * or only a single resource dump was requested,
3097 if (&pos->resources == &drbd_resources || cb->args[2])
3105 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
3106 cb->nlh->nlmsg_seq, &drbd_genl_family,
3107 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
3112 /* This is a connection without a single volume.
3113 * Suprisingly enough, it may have a network
3115 struct drbd_connection *connection;
3118 dh->ret_code = NO_ERROR;
3119 connection = the_only_connection(resource);
3120 if (nla_put_drbd_cfg_context(skb, resource, connection, NULL))
3123 struct net_conf *nc;
3125 nc = rcu_dereference(connection->net_conf);
3126 if (nc && net_conf_to_skb(skb, nc, 1) != 0)
3132 D_ASSERT(device, device->vnr == volume);
3133 D_ASSERT(device, device->resource == resource);
3135 dh->minor = device_to_minor(device);
3136 dh->ret_code = NO_ERROR;
3138 if (nla_put_status_info(skb, device, NULL)) {
3140 genlmsg_cancel(skb, dh);
3144 genlmsg_end(skb, dh);
3149 /* where to start the next iteration */
3150 cb->args[0] = (long)pos;
3151 cb->args[1] = (pos == resource) ? volume + 1 : 0;
3153 /* No more resources/volumes/minors found results in an empty skb.
3154 * Which will terminate the dump. */
3159 * Request status of all resources, or of all volumes within a single resource.
3161 * This is a dump, as the answer may not fit in a single reply skb otherwise.
3162 * Which means we cannot use the family->attrbuf or other such members, because
3163 * dump is NOT protected by the genl_lock(). During dump, we only have access
3164 * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
3166 * Once things are setup properly, we call into get_one_status().
3168 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
3170 const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
3172 const char *resource_name;
3173 struct drbd_resource *resource;
3176 /* Is this a followup call? */
3178 /* ... of a single resource dump,
3179 * and the resource iterator has been advanced already? */
3180 if (cb->args[2] && cb->args[2] != cb->args[0])
3181 return 0; /* DONE. */
3185 /* First call (from netlink_dump_start). We need to figure out
3186 * which resource(s) the user wants us to dump. */
3187 nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
3188 nlmsg_attrlen(cb->nlh, hdrlen),
3189 DRBD_NLA_CFG_CONTEXT);
3191 /* No explicit context given. Dump all. */
3194 maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
3195 nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
3197 return PTR_ERR(nla);
3198 /* context given, but no name present? */
3201 resource_name = nla_data(nla);
3202 if (!*resource_name)
3204 resource = drbd_find_resource(resource_name);
3208 kref_put(&resource->kref, drbd_destroy_resource); /* get_one_status() revalidates the resource */
3210 /* prime iterators, and set "filter" mode mark:
3211 * only dump this connection. */
3212 cb->args[0] = (long)resource;
3213 /* cb->args[1] = 0; passed in this way. */
3214 cb->args[2] = (long)resource;
3217 return get_one_status(skb, cb);
3220 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
3222 struct drbd_config_context adm_ctx;
3223 enum drbd_ret_code retcode;
3224 struct timeout_parms tp;
3227 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3228 if (!adm_ctx.reply_skb)
3230 if (retcode != NO_ERROR)
3234 adm_ctx.device->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
3235 test_bit(USE_DEGR_WFC_T, &adm_ctx.device->flags) ? UT_DEGRADED :
3238 err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
3240 nlmsg_free(adm_ctx.reply_skb);
3244 drbd_adm_finish(&adm_ctx, info, retcode);
3248 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
3250 struct drbd_config_context adm_ctx;
3251 struct drbd_device *device;
3252 enum drbd_ret_code retcode;
3253 struct start_ov_parms parms;
3255 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3256 if (!adm_ctx.reply_skb)
3258 if (retcode != NO_ERROR)
3261 device = adm_ctx.device;
3263 /* resume from last known position, if possible */
3264 parms.ov_start_sector = device->ov_start_sector;
3265 parms.ov_stop_sector = ULLONG_MAX;
3266 if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
3267 int err = start_ov_parms_from_attrs(&parms, info);
3269 retcode = ERR_MANDATORY_TAG;
3270 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
3274 mutex_lock(&adm_ctx.resource->adm_mutex);
3276 /* w_make_ov_request expects position to be aligned */
3277 device->ov_start_sector = parms.ov_start_sector & ~(BM_SECT_PER_BIT-1);
3278 device->ov_stop_sector = parms.ov_stop_sector;
3280 /* If there is still bitmap IO pending, e.g. previous resync or verify
3281 * just being finished, wait for it before requesting a new resync. */
3282 drbd_suspend_io(device);
3283 wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
3284 retcode = drbd_request_state(device, NS(conn, C_VERIFY_S));
3285 drbd_resume_io(device);
3287 mutex_unlock(&adm_ctx.resource->adm_mutex);
3289 drbd_adm_finish(&adm_ctx, info, retcode);
3294 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
3296 struct drbd_config_context adm_ctx;
3297 struct drbd_device *device;
3298 enum drbd_ret_code retcode;
3299 int skip_initial_sync = 0;
3301 struct new_c_uuid_parms args;
3303 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3304 if (!adm_ctx.reply_skb)
3306 if (retcode != NO_ERROR)
3309 device = adm_ctx.device;
3310 memset(&args, 0, sizeof(args));
3311 if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
3312 err = new_c_uuid_parms_from_attrs(&args, info);
3314 retcode = ERR_MANDATORY_TAG;
3315 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
3320 mutex_lock(&adm_ctx.resource->adm_mutex);
3321 mutex_lock(device->state_mutex); /* Protects us against serialized state changes. */
3323 if (!get_ldev(device)) {
3324 retcode = ERR_NO_DISK;
3328 /* this is "skip initial sync", assume to be clean */
3329 if (device->state.conn == C_CONNECTED &&
3330 first_peer_device(device)->connection->agreed_pro_version >= 90 &&
3331 device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
3332 drbd_info(device, "Preparing to skip initial sync\n");
3333 skip_initial_sync = 1;
3334 } else if (device->state.conn != C_STANDALONE) {
3335 retcode = ERR_CONNECTED;
3339 drbd_uuid_set(device, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
3340 drbd_uuid_new_current(device); /* New current, previous to UI_BITMAP */
3342 if (args.clear_bm) {
3343 err = drbd_bitmap_io(device, &drbd_bmio_clear_n_write,
3344 "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
3346 drbd_err(device, "Writing bitmap failed with %d\n", err);
3347 retcode = ERR_IO_MD_DISK;
3349 if (skip_initial_sync) {
3350 drbd_send_uuids_skip_initial_sync(first_peer_device(device));
3351 _drbd_uuid_set(device, UI_BITMAP, 0);
3352 drbd_print_uuids(device, "cleared bitmap UUID");
3353 spin_lock_irq(&device->resource->req_lock);
3354 _drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3356 spin_unlock_irq(&device->resource->req_lock);
3360 drbd_md_sync(device);
3364 mutex_unlock(device->state_mutex);
3365 mutex_unlock(&adm_ctx.resource->adm_mutex);
3367 drbd_adm_finish(&adm_ctx, info, retcode);
3371 static enum drbd_ret_code
3372 drbd_check_resource_name(struct drbd_config_context *adm_ctx)
3374 const char *name = adm_ctx->resource_name;
3375 if (!name || !name[0]) {
3376 drbd_msg_put_info(adm_ctx->reply_skb, "resource name missing");
3377 return ERR_MANDATORY_TAG;
3379 /* if we want to use these in sysfs/configfs/debugfs some day,
3380 * we must not allow slashes */
3381 if (strchr(name, '/')) {
3382 drbd_msg_put_info(adm_ctx->reply_skb, "invalid resource name");
3383 return ERR_INVALID_REQUEST;
3388 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
3390 struct drbd_config_context adm_ctx;
3391 enum drbd_ret_code retcode;
3392 struct res_opts res_opts;
3395 retcode = drbd_adm_prepare(&adm_ctx, skb, info, 0);
3396 if (!adm_ctx.reply_skb)
3398 if (retcode != NO_ERROR)
3401 set_res_opts_defaults(&res_opts);
3402 err = res_opts_from_attrs(&res_opts, info);
3403 if (err && err != -ENOMSG) {
3404 retcode = ERR_MANDATORY_TAG;
3405 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
3409 retcode = drbd_check_resource_name(&adm_ctx);
3410 if (retcode != NO_ERROR)
3413 if (adm_ctx.resource) {
3414 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
3415 retcode = ERR_INVALID_REQUEST;
3416 drbd_msg_put_info(adm_ctx.reply_skb, "resource exists");
3418 /* else: still NO_ERROR */
3422 /* not yet safe for genl_family.parallel_ops */
3423 if (!conn_create(adm_ctx.resource_name, &res_opts))
3424 retcode = ERR_NOMEM;
3426 drbd_adm_finish(&adm_ctx, info, retcode);
3430 int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info)
3432 struct drbd_config_context adm_ctx;
3433 struct drbd_genlmsghdr *dh = info->userhdr;
3434 enum drbd_ret_code retcode;
3436 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
3437 if (!adm_ctx.reply_skb)
3439 if (retcode != NO_ERROR)
3442 if (dh->minor > MINORMASK) {
3443 drbd_msg_put_info(adm_ctx.reply_skb, "requested minor out of range");
3444 retcode = ERR_INVALID_REQUEST;
3447 if (adm_ctx.volume > DRBD_VOLUME_MAX) {
3448 drbd_msg_put_info(adm_ctx.reply_skb, "requested volume id out of range");
3449 retcode = ERR_INVALID_REQUEST;
3453 /* drbd_adm_prepare made sure already
3454 * that first_peer_device(device)->connection and device->vnr match the request. */
3455 if (adm_ctx.device) {
3456 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3457 retcode = ERR_MINOR_EXISTS;
3458 /* else: still NO_ERROR */
3462 mutex_lock(&adm_ctx.resource->adm_mutex);
3463 retcode = drbd_create_device(&adm_ctx, dh->minor);
3464 mutex_unlock(&adm_ctx.resource->adm_mutex);
3466 drbd_adm_finish(&adm_ctx, info, retcode);
3470 static enum drbd_ret_code adm_del_minor(struct drbd_device *device)
3472 if (device->state.disk == D_DISKLESS &&
3473 /* no need to be device->state.conn == C_STANDALONE &&
3474 * we may want to delete a minor from a live replication group.
3476 device->state.role == R_SECONDARY) {
3477 _drbd_request_state(device, NS(conn, C_WF_REPORT_PARAMS),
3478 CS_VERBOSE + CS_WAIT_COMPLETE);
3479 drbd_delete_device(device);
3482 return ERR_MINOR_CONFIGURED;
3485 int drbd_adm_del_minor(struct sk_buff *skb, struct genl_info *info)
3487 struct drbd_config_context adm_ctx;
3488 enum drbd_ret_code retcode;
3490 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3491 if (!adm_ctx.reply_skb)
3493 if (retcode != NO_ERROR)
3496 mutex_lock(&adm_ctx.resource->adm_mutex);
3497 retcode = adm_del_minor(adm_ctx.device);
3498 mutex_unlock(&adm_ctx.resource->adm_mutex);
3500 drbd_adm_finish(&adm_ctx, info, retcode);
3504 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3506 struct drbd_config_context adm_ctx;
3507 struct drbd_resource *resource;
3508 struct drbd_connection *connection;
3509 struct drbd_device *device;
3510 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
3513 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
3514 if (!adm_ctx.reply_skb)
3516 if (retcode != NO_ERROR)
3519 resource = adm_ctx.resource;
3520 mutex_lock(&resource->adm_mutex);
3522 for_each_connection(connection, resource) {
3523 struct drbd_peer_device *peer_device;
3525 idr_for_each_entry(&connection->peer_devices, peer_device, i) {
3526 retcode = drbd_set_role(peer_device->device, R_SECONDARY, 0);
3527 if (retcode < SS_SUCCESS) {
3528 drbd_msg_put_info(adm_ctx.reply_skb, "failed to demote");
3533 retcode = conn_try_disconnect(connection, 0);
3534 if (retcode < SS_SUCCESS) {
3535 drbd_msg_put_info(adm_ctx.reply_skb, "failed to disconnect");
3541 idr_for_each_entry(&resource->devices, device, i) {
3542 retcode = adm_detach(device, 0);
3543 if (retcode < SS_SUCCESS || retcode > NO_ERROR) {
3544 drbd_msg_put_info(adm_ctx.reply_skb, "failed to detach");
3549 /* If we reach this, all volumes (of this connection) are Secondary,
3550 * Disconnected, Diskless, aka Unconfigured. Make sure all threads have
3551 * actually stopped, state handling only does drbd_thread_stop_nowait(). */
3552 for_each_connection(connection, resource)
3553 drbd_thread_stop(&connection->worker);
3555 /* Now, nothing can fail anymore */
3557 /* delete volumes */
3558 idr_for_each_entry(&resource->devices, device, i) {
3559 retcode = adm_del_minor(device);
3560 if (retcode != NO_ERROR) {
3561 /* "can not happen" */
3562 drbd_msg_put_info(adm_ctx.reply_skb, "failed to delete volume");
3567 list_del_rcu(&resource->resources);
3569 drbd_free_resource(resource);
3572 mutex_unlock(&resource->adm_mutex);
3574 drbd_adm_finish(&adm_ctx, info, retcode);
3578 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
3580 struct drbd_config_context adm_ctx;
3581 struct drbd_resource *resource;
3582 struct drbd_connection *connection;
3583 enum drbd_ret_code retcode;
3585 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
3586 if (!adm_ctx.reply_skb)
3588 if (retcode != NO_ERROR)
3591 resource = adm_ctx.resource;
3592 mutex_lock(&resource->adm_mutex);
3593 for_each_connection(connection, resource) {
3594 if (connection->cstate > C_STANDALONE) {
3595 retcode = ERR_NET_CONFIGURED;
3599 if (!idr_is_empty(&resource->devices)) {
3600 retcode = ERR_RES_IN_USE;
3604 list_del_rcu(&resource->resources);
3605 for_each_connection(connection, resource)
3606 drbd_thread_stop(&connection->worker);
3608 drbd_free_resource(resource);
3611 mutex_unlock(&resource->adm_mutex);
3613 drbd_adm_finish(&adm_ctx, info, retcode);
3617 void drbd_bcast_event(struct drbd_device *device, const struct sib_info *sib)
3619 static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3620 struct sk_buff *msg;
3621 struct drbd_genlmsghdr *d_out;
3625 if (sib->sib_reason == SIB_SYNC_PROGRESS) {
3626 if (time_after(jiffies, device->rs_last_bcast + HZ))
3627 device->rs_last_bcast = jiffies;
3632 seq = atomic_inc_return(&drbd_genl_seq);
3633 msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3638 d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3639 if (!d_out) /* cannot happen, but anyways. */
3640 goto nla_put_failure;
3641 d_out->minor = device_to_minor(device);
3642 d_out->ret_code = NO_ERROR;
3644 if (nla_put_status_info(msg, device, sib))
3645 goto nla_put_failure;
3646 genlmsg_end(msg, d_out);
3647 err = drbd_genl_multicast_events(msg, 0);
3648 /* msg has been consumed or freed in netlink_broadcast() */
3649 if (err && err != -ESRCH)
3657 drbd_err(device, "Error %d while broadcasting event. "
3658 "Event seq:%u sib_reason:%u\n",
3659 err, seq, sib->sib_reason);