1 // SPDX-License-Identifier: GPL-2.0-only
5 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
7 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
8 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
9 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <linux/module.h>
17 #include <linux/drbd.h>
20 #include <linux/file.h>
21 #include <linux/slab.h>
22 #include <linux/blkpg.h>
23 #include <linux/cpumask.h>
25 #include "drbd_protocol.h"
27 #include "drbd_state_change.h"
28 #include <asm/unaligned.h>
29 #include <linux/drbd_limits.h>
30 #include <linux/kthread.h>
32 #include <net/genetlink.h>
35 // int drbd_adm_create_resource(struct sk_buff *skb, struct genl_info *info);
36 // int drbd_adm_delete_resource(struct sk_buff *skb, struct genl_info *info);
38 int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info);
39 int drbd_adm_del_minor(struct sk_buff *skb, struct genl_info *info);
41 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info);
42 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info);
43 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info);
45 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info);
46 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info);
47 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info);
48 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info);
49 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info);
50 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info);
51 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info);
52 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info);
53 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info);
54 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info);
55 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info);
56 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info);
57 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info);
58 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info);
59 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info);
60 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info);
61 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info);
62 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info);
63 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info);
64 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info);
66 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb);
67 int drbd_adm_dump_resources(struct sk_buff *skb, struct netlink_callback *cb);
68 int drbd_adm_dump_devices(struct sk_buff *skb, struct netlink_callback *cb);
69 int drbd_adm_dump_devices_done(struct netlink_callback *cb);
70 int drbd_adm_dump_connections(struct sk_buff *skb, struct netlink_callback *cb);
71 int drbd_adm_dump_connections_done(struct netlink_callback *cb);
72 int drbd_adm_dump_peer_devices(struct sk_buff *skb, struct netlink_callback *cb);
73 int drbd_adm_dump_peer_devices_done(struct netlink_callback *cb);
74 int drbd_adm_get_initial_state(struct sk_buff *skb, struct netlink_callback *cb);
76 #include <linux/drbd_genl_api.h>
78 #include <linux/genl_magic_func.h>
80 static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
81 static atomic_t notify_genl_seq = ATOMIC_INIT(2); /* two. */
83 DEFINE_MUTEX(notification_mutex);
85 /* used blkdev_get_by_path, to claim our meta data device(s) */
86 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
88 static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
90 genlmsg_end(skb, genlmsg_data(nlmsg_data(nlmsg_hdr(skb))));
91 if (genlmsg_reply(skb, info))
92 pr_err("error sending genl reply\n");
95 /* Used on a fresh "drbd_adm_prepare"d reply_skb, this cannot fail: The only
96 * reason it could fail was no space in skb, and there are 4k available. */
97 static int drbd_msg_put_info(struct sk_buff *skb, const char *info)
102 if (!info || !info[0])
105 nla = nla_nest_start_noflag(skb, DRBD_NLA_CFG_REPLY);
109 err = nla_put_string(skb, T_info_text, info);
111 nla_nest_cancel(skb, nla);
114 nla_nest_end(skb, nla);
119 static int drbd_msg_sprintf_info(struct sk_buff *skb, const char *fmt, ...)
122 struct nlattr *nla, *txt;
126 nla = nla_nest_start_noflag(skb, DRBD_NLA_CFG_REPLY);
130 txt = nla_reserve(skb, T_info_text, 256);
132 nla_nest_cancel(skb, nla);
136 len = vscnprintf(nla_data(txt), 256, fmt, args);
139 /* maybe: retry with larger reserve, if truncated */
140 txt->nla_len = nla_attr_size(len+1);
141 nlmsg_trim(skb, (char*)txt + NLA_ALIGN(txt->nla_len));
142 nla_nest_end(skb, nla);
147 /* This would be a good candidate for a "pre_doit" hook,
148 * and per-family private info->pointers.
149 * But we need to stay compatible with older kernels.
150 * If it returns successfully, adm_ctx members are valid.
152 * At this point, we still rely on the global genl_lock().
153 * If we want to avoid that, and allow "genl_family.parallel_ops", we may need
154 * to add additional synchronization against object destruction/modification.
156 #define DRBD_ADM_NEED_MINOR 1
157 #define DRBD_ADM_NEED_RESOURCE 2
158 #define DRBD_ADM_NEED_CONNECTION 4
159 static int drbd_adm_prepare(struct drbd_config_context *adm_ctx,
160 struct sk_buff *skb, struct genl_info *info, unsigned flags)
162 struct drbd_genlmsghdr *d_in = info->userhdr;
163 const u8 cmd = info->genlhdr->cmd;
166 memset(adm_ctx, 0, sizeof(*adm_ctx));
168 /* genl_rcv_msg only checks for CAP_NET_ADMIN on "GENL_ADMIN_PERM" :( */
169 if (cmd != DRBD_ADM_GET_STATUS && !capable(CAP_NET_ADMIN))
172 adm_ctx->reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
173 if (!adm_ctx->reply_skb) {
178 adm_ctx->reply_dh = genlmsg_put_reply(adm_ctx->reply_skb,
179 info, &drbd_genl_family, 0, cmd);
180 /* put of a few bytes into a fresh skb of >= 4k will always succeed.
182 if (!adm_ctx->reply_dh) {
187 adm_ctx->reply_dh->minor = d_in->minor;
188 adm_ctx->reply_dh->ret_code = NO_ERROR;
190 adm_ctx->volume = VOLUME_UNSPECIFIED;
191 if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
193 /* parse and validate only */
194 err = drbd_cfg_context_from_attrs(NULL, info);
198 /* It was present, and valid,
199 * copy it over to the reply skb. */
200 err = nla_put_nohdr(adm_ctx->reply_skb,
201 info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
202 info->attrs[DRBD_NLA_CFG_CONTEXT]);
206 /* and assign stuff to the adm_ctx */
207 nla = nested_attr_tb[__nla_type(T_ctx_volume)];
209 adm_ctx->volume = nla_get_u32(nla);
210 nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
212 adm_ctx->resource_name = nla_data(nla);
213 adm_ctx->my_addr = nested_attr_tb[__nla_type(T_ctx_my_addr)];
214 adm_ctx->peer_addr = nested_attr_tb[__nla_type(T_ctx_peer_addr)];
215 if ((adm_ctx->my_addr &&
216 nla_len(adm_ctx->my_addr) > sizeof(adm_ctx->connection->my_addr)) ||
217 (adm_ctx->peer_addr &&
218 nla_len(adm_ctx->peer_addr) > sizeof(adm_ctx->connection->peer_addr))) {
224 adm_ctx->minor = d_in->minor;
225 adm_ctx->device = minor_to_device(d_in->minor);
227 /* We are protected by the global genl_lock().
228 * But we may explicitly drop it/retake it in drbd_adm_set_role(),
229 * so make sure this object stays around. */
231 kref_get(&adm_ctx->device->kref);
233 if (adm_ctx->resource_name) {
234 adm_ctx->resource = drbd_find_resource(adm_ctx->resource_name);
237 if (!adm_ctx->device && (flags & DRBD_ADM_NEED_MINOR)) {
238 drbd_msg_put_info(adm_ctx->reply_skb, "unknown minor");
239 return ERR_MINOR_INVALID;
241 if (!adm_ctx->resource && (flags & DRBD_ADM_NEED_RESOURCE)) {
242 drbd_msg_put_info(adm_ctx->reply_skb, "unknown resource");
243 if (adm_ctx->resource_name)
244 return ERR_RES_NOT_KNOWN;
245 return ERR_INVALID_REQUEST;
248 if (flags & DRBD_ADM_NEED_CONNECTION) {
249 if (adm_ctx->resource) {
250 drbd_msg_put_info(adm_ctx->reply_skb, "no resource name expected");
251 return ERR_INVALID_REQUEST;
253 if (adm_ctx->device) {
254 drbd_msg_put_info(adm_ctx->reply_skb, "no minor number expected");
255 return ERR_INVALID_REQUEST;
257 if (adm_ctx->my_addr && adm_ctx->peer_addr)
258 adm_ctx->connection = conn_get_by_addrs(nla_data(adm_ctx->my_addr),
259 nla_len(adm_ctx->my_addr),
260 nla_data(adm_ctx->peer_addr),
261 nla_len(adm_ctx->peer_addr));
262 if (!adm_ctx->connection) {
263 drbd_msg_put_info(adm_ctx->reply_skb, "unknown connection");
264 return ERR_INVALID_REQUEST;
268 /* some more paranoia, if the request was over-determined */
269 if (adm_ctx->device && adm_ctx->resource &&
270 adm_ctx->device->resource != adm_ctx->resource) {
271 pr_warn("request: minor=%u, resource=%s; but that minor belongs to resource %s\n",
272 adm_ctx->minor, adm_ctx->resource->name,
273 adm_ctx->device->resource->name);
274 drbd_msg_put_info(adm_ctx->reply_skb, "minor exists in different resource");
275 return ERR_INVALID_REQUEST;
277 if (adm_ctx->device &&
278 adm_ctx->volume != VOLUME_UNSPECIFIED &&
279 adm_ctx->volume != adm_ctx->device->vnr) {
280 pr_warn("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
281 adm_ctx->minor, adm_ctx->volume,
282 adm_ctx->device->vnr, adm_ctx->device->resource->name);
283 drbd_msg_put_info(adm_ctx->reply_skb, "minor exists as different volume");
284 return ERR_INVALID_REQUEST;
287 /* still, provide adm_ctx->resource always, if possible. */
288 if (!adm_ctx->resource) {
289 adm_ctx->resource = adm_ctx->device ? adm_ctx->device->resource
290 : adm_ctx->connection ? adm_ctx->connection->resource : NULL;
291 if (adm_ctx->resource)
292 kref_get(&adm_ctx->resource->kref);
298 nlmsg_free(adm_ctx->reply_skb);
299 adm_ctx->reply_skb = NULL;
303 static int drbd_adm_finish(struct drbd_config_context *adm_ctx,
304 struct genl_info *info, int retcode)
306 if (adm_ctx->device) {
307 kref_put(&adm_ctx->device->kref, drbd_destroy_device);
308 adm_ctx->device = NULL;
310 if (adm_ctx->connection) {
311 kref_put(&adm_ctx->connection->kref, &drbd_destroy_connection);
312 adm_ctx->connection = NULL;
314 if (adm_ctx->resource) {
315 kref_put(&adm_ctx->resource->kref, drbd_destroy_resource);
316 adm_ctx->resource = NULL;
319 if (!adm_ctx->reply_skb)
322 adm_ctx->reply_dh->ret_code = retcode;
323 drbd_adm_send_reply(adm_ctx->reply_skb, info);
327 static void setup_khelper_env(struct drbd_connection *connection, char **envp)
331 /* FIXME: A future version will not allow this case. */
332 if (connection->my_addr_len == 0 || connection->peer_addr_len == 0)
335 switch (((struct sockaddr *)&connection->peer_addr)->sa_family) {
338 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
339 &((struct sockaddr_in6 *)&connection->peer_addr)->sin6_addr);
343 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
344 &((struct sockaddr_in *)&connection->peer_addr)->sin_addr);
348 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
349 &((struct sockaddr_in *)&connection->peer_addr)->sin_addr);
351 snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
354 int drbd_khelper(struct drbd_device *device, char *cmd)
356 char *envp[] = { "HOME=/",
358 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
359 (char[20]) { }, /* address family */
360 (char[60]) { }, /* address */
363 char *argv[] = {drbd_usermode_helper, cmd, mb, NULL };
364 struct drbd_connection *connection = first_peer_device(device)->connection;
368 if (current == connection->worker.task)
369 set_bit(CALLBACK_PENDING, &connection->flags);
371 snprintf(mb, 14, "minor-%d", device_to_minor(device));
372 setup_khelper_env(connection, envp);
374 /* The helper may take some time.
375 * write out any unsynced meta data changes now */
376 drbd_md_sync(device);
378 drbd_info(device, "helper command: %s %s %s\n", drbd_usermode_helper, cmd, mb);
379 sib.sib_reason = SIB_HELPER_PRE;
380 sib.helper_name = cmd;
381 drbd_bcast_event(device, &sib);
382 notify_helper(NOTIFY_CALL, device, connection, cmd, 0);
383 ret = call_usermodehelper(drbd_usermode_helper, argv, envp, UMH_WAIT_PROC);
385 drbd_warn(device, "helper command: %s %s %s exit code %u (0x%x)\n",
386 drbd_usermode_helper, cmd, mb,
387 (ret >> 8) & 0xff, ret);
389 drbd_info(device, "helper command: %s %s %s exit code %u (0x%x)\n",
390 drbd_usermode_helper, cmd, mb,
391 (ret >> 8) & 0xff, ret);
392 sib.sib_reason = SIB_HELPER_POST;
393 sib.helper_exit_code = ret;
394 drbd_bcast_event(device, &sib);
395 notify_helper(NOTIFY_RESPONSE, device, connection, cmd, ret);
397 if (current == connection->worker.task)
398 clear_bit(CALLBACK_PENDING, &connection->flags);
400 if (ret < 0) /* Ignore any ERRNOs we got. */
406 enum drbd_peer_state conn_khelper(struct drbd_connection *connection, char *cmd)
408 char *envp[] = { "HOME=/",
410 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
411 (char[20]) { }, /* address family */
412 (char[60]) { }, /* address */
414 char *resource_name = connection->resource->name;
415 char *argv[] = {drbd_usermode_helper, cmd, resource_name, NULL };
418 setup_khelper_env(connection, envp);
419 conn_md_sync(connection);
421 drbd_info(connection, "helper command: %s %s %s\n", drbd_usermode_helper, cmd, resource_name);
422 /* TODO: conn_bcast_event() ?? */
423 notify_helper(NOTIFY_CALL, NULL, connection, cmd, 0);
425 ret = call_usermodehelper(drbd_usermode_helper, argv, envp, UMH_WAIT_PROC);
427 drbd_warn(connection, "helper command: %s %s %s exit code %u (0x%x)\n",
428 drbd_usermode_helper, cmd, resource_name,
429 (ret >> 8) & 0xff, ret);
431 drbd_info(connection, "helper command: %s %s %s exit code %u (0x%x)\n",
432 drbd_usermode_helper, cmd, resource_name,
433 (ret >> 8) & 0xff, ret);
434 /* TODO: conn_bcast_event() ?? */
435 notify_helper(NOTIFY_RESPONSE, NULL, connection, cmd, ret);
437 if (ret < 0) /* Ignore any ERRNOs we got. */
443 static enum drbd_fencing_p highest_fencing_policy(struct drbd_connection *connection)
445 enum drbd_fencing_p fp = FP_NOT_AVAIL;
446 struct drbd_peer_device *peer_device;
450 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
451 struct drbd_device *device = peer_device->device;
452 if (get_ldev_if_state(device, D_CONSISTENT)) {
453 struct disk_conf *disk_conf =
454 rcu_dereference(peer_device->device->ldev->disk_conf);
455 fp = max_t(enum drbd_fencing_p, fp, disk_conf->fencing);
464 static bool resource_is_supended(struct drbd_resource *resource)
466 return resource->susp || resource->susp_fen || resource->susp_nod;
469 bool conn_try_outdate_peer(struct drbd_connection *connection)
471 struct drbd_resource * const resource = connection->resource;
472 unsigned int connect_cnt;
473 union drbd_state mask = { };
474 union drbd_state val = { };
475 enum drbd_fencing_p fp;
479 spin_lock_irq(&resource->req_lock);
480 if (connection->cstate >= C_WF_REPORT_PARAMS) {
481 drbd_err(connection, "Expected cstate < C_WF_REPORT_PARAMS\n");
482 spin_unlock_irq(&resource->req_lock);
486 connect_cnt = connection->connect_cnt;
487 spin_unlock_irq(&resource->req_lock);
489 fp = highest_fencing_policy(connection);
492 drbd_warn(connection, "Not fencing peer, I'm not even Consistent myself.\n");
493 spin_lock_irq(&resource->req_lock);
494 if (connection->cstate < C_WF_REPORT_PARAMS) {
495 _conn_request_state(connection,
496 (union drbd_state) { { .susp_fen = 1 } },
497 (union drbd_state) { { .susp_fen = 0 } },
498 CS_VERBOSE | CS_HARD | CS_DC_SUSP);
499 /* We are no longer suspended due to the fencing policy.
500 * We may still be suspended due to the on-no-data-accessible policy.
501 * If that was OND_IO_ERROR, fail pending requests. */
502 if (!resource_is_supended(resource))
503 _tl_restart(connection, CONNECTION_LOST_WHILE_PENDING);
505 /* Else: in case we raced with a connection handshake,
506 * let the handshake figure out if we maybe can RESEND,
507 * and do not resume/fail pending requests here.
508 * Worst case is we stay suspended for now, which may be
509 * resolved by either re-establishing the replication link, or
510 * the next link failure, or eventually the administrator. */
511 spin_unlock_irq(&resource->req_lock);
519 r = conn_khelper(connection, "fence-peer");
521 switch ((r>>8) & 0xff) {
522 case P_INCONSISTENT: /* peer is inconsistent */
523 ex_to_string = "peer is inconsistent or worse";
525 val.pdsk = D_INCONSISTENT;
527 case P_OUTDATED: /* peer got outdated, or was already outdated */
528 ex_to_string = "peer was fenced";
530 val.pdsk = D_OUTDATED;
532 case P_DOWN: /* peer was down */
533 if (conn_highest_disk(connection) == D_UP_TO_DATE) {
534 /* we will(have) create(d) a new UUID anyways... */
535 ex_to_string = "peer is unreachable, assumed to be dead";
537 val.pdsk = D_OUTDATED;
539 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
542 case P_PRIMARY: /* Peer is primary, voluntarily outdate myself.
543 * This is useful when an unconnected R_SECONDARY is asked to
544 * become R_PRIMARY, but finds the other peer being active. */
545 ex_to_string = "peer is active";
546 drbd_warn(connection, "Peer is primary, outdating myself.\n");
548 val.disk = D_OUTDATED;
551 /* THINK: do we need to handle this
552 * like case 4, or more like case 5? */
553 if (fp != FP_STONITH)
554 drbd_err(connection, "fence-peer() = 7 && fencing != Stonith !!!\n");
555 ex_to_string = "peer was stonithed";
557 val.pdsk = D_OUTDATED;
560 /* The script is broken ... */
561 drbd_err(connection, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
562 return false; /* Eventually leave IO frozen */
565 drbd_info(connection, "fence-peer helper returned %d (%s)\n",
566 (r>>8) & 0xff, ex_to_string);
569 conn_request_state(connection, mask, val, CS_VERBOSE);
570 here, because we might were able to re-establish the connection in the
572 spin_lock_irq(&resource->req_lock);
573 if (connection->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &connection->flags)) {
574 if (connection->connect_cnt != connect_cnt)
575 /* In case the connection was established and droped
576 while the fence-peer handler was running, ignore it */
577 drbd_info(connection, "Ignoring fence-peer exit code\n");
579 _conn_request_state(connection, mask, val, CS_VERBOSE);
581 spin_unlock_irq(&resource->req_lock);
583 return conn_highest_pdsk(connection) <= D_OUTDATED;
586 static int _try_outdate_peer_async(void *data)
588 struct drbd_connection *connection = (struct drbd_connection *)data;
590 conn_try_outdate_peer(connection);
592 kref_put(&connection->kref, drbd_destroy_connection);
596 void conn_try_outdate_peer_async(struct drbd_connection *connection)
598 struct task_struct *opa;
600 kref_get(&connection->kref);
601 /* We may have just sent a signal to this thread
602 * to get it out of some blocking network function.
603 * Clear signals; otherwise kthread_run(), which internally uses
604 * wait_on_completion_killable(), will mistake our pending signal
605 * for a new fatal signal and fail. */
606 flush_signals(current);
607 opa = kthread_run(_try_outdate_peer_async, connection, "drbd_async_h");
609 drbd_err(connection, "out of mem, failed to invoke fence-peer helper\n");
610 kref_put(&connection->kref, drbd_destroy_connection);
615 drbd_set_role(struct drbd_device *const device, enum drbd_role new_role, int force)
617 struct drbd_peer_device *const peer_device = first_peer_device(device);
618 struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL;
619 const int max_tries = 4;
620 enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
624 union drbd_state mask, val;
626 if (new_role == R_PRIMARY) {
627 struct drbd_connection *connection;
629 /* Detect dead peers as soon as possible. */
632 for_each_connection(connection, device->resource)
633 request_ping(connection);
637 mutex_lock(device->state_mutex);
639 mask.i = 0; mask.role = R_MASK;
640 val.i = 0; val.role = new_role;
642 while (try++ < max_tries) {
643 rv = _drbd_request_state_holding_state_mutex(device, mask, val, CS_WAIT_COMPLETE);
645 /* in case we first succeeded to outdate,
646 * but now suddenly could establish a connection */
647 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
653 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
654 (device->state.disk < D_UP_TO_DATE &&
655 device->state.disk >= D_INCONSISTENT)) {
657 val.disk = D_UP_TO_DATE;
662 if (rv == SS_NO_UP_TO_DATE_DISK &&
663 device->state.disk == D_CONSISTENT && mask.pdsk == 0) {
664 D_ASSERT(device, device->state.pdsk == D_UNKNOWN);
666 if (conn_try_outdate_peer(connection)) {
667 val.disk = D_UP_TO_DATE;
673 if (rv == SS_NOTHING_TO_DO)
675 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
676 if (!conn_try_outdate_peer(connection) && force) {
677 drbd_warn(device, "Forced into split brain situation!\n");
679 val.pdsk = D_OUTDATED;
684 if (rv == SS_TWO_PRIMARIES) {
685 /* Maybe the peer is detected as dead very soon...
686 retry at most once more in this case. */
687 if (try < max_tries) {
691 nc = rcu_dereference(connection->net_conf);
692 timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
694 schedule_timeout_interruptible(timeo);
698 if (rv < SS_SUCCESS) {
699 rv = _drbd_request_state(device, mask, val,
700 CS_VERBOSE + CS_WAIT_COMPLETE);
711 drbd_warn(device, "Forced to consider local data as UpToDate!\n");
713 /* Wait until nothing is on the fly :) */
714 wait_event(device->misc_wait, atomic_read(&device->ap_pending_cnt) == 0);
716 /* FIXME also wait for all pending P_BARRIER_ACK? */
718 if (new_role == R_SECONDARY) {
719 if (get_ldev(device)) {
720 device->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
724 mutex_lock(&device->resource->conf_update);
725 nc = connection->net_conf;
727 nc->discard_my_data = 0; /* without copy; single bit op is atomic */
728 mutex_unlock(&device->resource->conf_update);
730 if (get_ldev(device)) {
731 if (((device->state.conn < C_CONNECTED ||
732 device->state.pdsk <= D_FAILED)
733 && device->ldev->md.uuid[UI_BITMAP] == 0) || forced)
734 drbd_uuid_new_current(device);
736 device->ldev->md.uuid[UI_CURRENT] |= (u64)1;
741 /* writeout of activity log covered areas of the bitmap
742 * to stable storage done in after state change already */
744 if (device->state.conn >= C_WF_REPORT_PARAMS) {
745 /* if this was forced, we should consider sync */
747 drbd_send_uuids(peer_device);
748 drbd_send_current_state(peer_device);
751 drbd_md_sync(device);
752 set_disk_ro(device->vdisk, new_role == R_SECONDARY);
753 kobject_uevent(&disk_to_dev(device->vdisk)->kobj, KOBJ_CHANGE);
755 mutex_unlock(device->state_mutex);
759 static const char *from_attrs_err_to_txt(int err)
761 return err == -ENOMSG ? "required attribute missing" :
762 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
763 err == -EEXIST ? "can not change invariant setting" :
764 "invalid attribute value";
767 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
769 struct drbd_config_context adm_ctx;
770 struct set_role_parms parms;
772 enum drbd_ret_code retcode;
773 enum drbd_state_rv rv;
775 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
776 if (!adm_ctx.reply_skb)
778 if (retcode != NO_ERROR)
781 memset(&parms, 0, sizeof(parms));
782 if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
783 err = set_role_parms_from_attrs(&parms, info);
785 retcode = ERR_MANDATORY_TAG;
786 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
791 mutex_lock(&adm_ctx.resource->adm_mutex);
793 if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
794 rv = drbd_set_role(adm_ctx.device, R_PRIMARY, parms.assume_uptodate);
796 rv = drbd_set_role(adm_ctx.device, R_SECONDARY, 0);
798 mutex_unlock(&adm_ctx.resource->adm_mutex);
800 drbd_adm_finish(&adm_ctx, info, rv);
803 drbd_adm_finish(&adm_ctx, info, retcode);
807 /* Initializes the md.*_offset members, so we are able to find
808 * the on disk meta data.
810 * We currently have two possible layouts:
812 * |----------- md_size_sect ------------------|
813 * [ 4k superblock ][ activity log ][ Bitmap ]
815 * | bm_offset = al_offset + X |
816 * ==> bitmap sectors = md_size_sect - bm_offset
819 * |----------- md_size_sect ------------------|
820 * [data.....][ Bitmap ][ activity log ][ 4k superblock ]
822 * | bm_offset = al_offset - Y |
823 * ==> bitmap sectors = Y = al_offset - bm_offset
825 * Activity log size used to be fixed 32kB,
826 * but is about to become configurable.
828 static void drbd_md_set_sector_offsets(struct drbd_device *device,
829 struct drbd_backing_dev *bdev)
831 sector_t md_size_sect = 0;
832 unsigned int al_size_sect = bdev->md.al_size_4k * 8;
834 bdev->md.md_offset = drbd_md_ss(bdev);
836 switch (bdev->md.meta_dev_idx) {
838 /* v07 style fixed size indexed meta data */
839 bdev->md.md_size_sect = MD_128MB_SECT;
840 bdev->md.al_offset = MD_4kB_SECT;
841 bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
843 case DRBD_MD_INDEX_FLEX_EXT:
844 /* just occupy the full device; unit: sectors */
845 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
846 bdev->md.al_offset = MD_4kB_SECT;
847 bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
849 case DRBD_MD_INDEX_INTERNAL:
850 case DRBD_MD_INDEX_FLEX_INT:
851 /* al size is still fixed */
852 bdev->md.al_offset = -al_size_sect;
853 /* we need (slightly less than) ~ this much bitmap sectors: */
854 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
855 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
856 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
857 md_size_sect = ALIGN(md_size_sect, 8);
859 /* plus the "drbd meta data super block",
860 * and the activity log; */
861 md_size_sect += MD_4kB_SECT + al_size_sect;
863 bdev->md.md_size_sect = md_size_sect;
864 /* bitmap offset is adjusted by 'super' block size */
865 bdev->md.bm_offset = -md_size_sect + MD_4kB_SECT;
870 /* input size is expected to be in KB */
871 char *ppsize(char *buf, unsigned long long size)
873 /* Needs 9 bytes at max including trailing NUL:
874 * -1ULL ==> "16384 EB" */
875 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
877 while (size >= 10000 && base < sizeof(units)-1) {
879 size = (size >> 10) + !!(size & (1<<9));
882 sprintf(buf, "%u %cB", (unsigned)size, units[base]);
887 /* there is still a theoretical deadlock when called from receiver
888 * on an D_INCONSISTENT R_PRIMARY:
889 * remote READ does inc_ap_bio, receiver would need to receive answer
890 * packet from remote to dec_ap_bio again.
891 * receiver receive_sizes(), comes here,
892 * waits for ap_bio_cnt == 0. -> deadlock.
893 * but this cannot happen, actually, because:
894 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
895 * (not connected, or bad/no disk on peer):
896 * see drbd_fail_request_early, ap_bio_cnt is zero.
897 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
898 * peer may not initiate a resize.
900 /* Note these are not to be confused with
901 * drbd_adm_suspend_io/drbd_adm_resume_io,
902 * which are (sub) state changes triggered by admin (drbdsetup),
903 * and can be long lived.
904 * This changes an device->flag, is triggered by drbd internals,
905 * and should be short-lived. */
906 /* It needs to be a counter, since multiple threads might
907 independently suspend and resume IO. */
908 void drbd_suspend_io(struct drbd_device *device)
910 atomic_inc(&device->suspend_cnt);
911 if (drbd_suspended(device))
913 wait_event(device->misc_wait, !atomic_read(&device->ap_bio_cnt));
916 void drbd_resume_io(struct drbd_device *device)
918 if (atomic_dec_and_test(&device->suspend_cnt))
919 wake_up(&device->misc_wait);
923 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
924 * @device: DRBD device.
926 * Returns 0 on success, negative return values indicate errors.
927 * You should call drbd_md_sync() after calling this function.
929 enum determine_dev_size
930 drbd_determine_dev_size(struct drbd_device *device, enum dds_flags flags, struct resize_parms *rs) __must_hold(local)
932 struct md_offsets_and_sizes {
933 u64 last_agreed_sect;
940 u32 al_stripe_size_4k;
942 sector_t u_size, size;
943 struct drbd_md *md = &device->ldev->md;
946 int md_moved, la_size_changed;
947 enum determine_dev_size rv = DS_UNCHANGED;
949 /* We may change the on-disk offsets of our meta data below. Lock out
950 * anything that may cause meta data IO, to avoid acting on incomplete
951 * layout changes or scribbling over meta data that is in the process
954 * Move is not exactly correct, btw, currently we have all our meta
955 * data in core memory, to "move" it we just write it all out, there
957 drbd_suspend_io(device);
958 buffer = drbd_md_get_buffer(device, __func__); /* Lock meta-data IO */
960 drbd_resume_io(device);
964 /* remember current offset and sizes */
965 prev.last_agreed_sect = md->la_size_sect;
966 prev.md_offset = md->md_offset;
967 prev.al_offset = md->al_offset;
968 prev.bm_offset = md->bm_offset;
969 prev.md_size_sect = md->md_size_sect;
970 prev.al_stripes = md->al_stripes;
971 prev.al_stripe_size_4k = md->al_stripe_size_4k;
974 /* rs is non NULL if we should change the AL layout only */
975 md->al_stripes = rs->al_stripes;
976 md->al_stripe_size_4k = rs->al_stripe_size / 4;
977 md->al_size_4k = (u64)rs->al_stripes * rs->al_stripe_size / 4;
980 drbd_md_set_sector_offsets(device, device->ldev);
983 u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
985 size = drbd_new_dev_size(device, device->ldev, u_size, flags & DDSF_FORCED);
987 if (size < prev.last_agreed_sect) {
988 if (rs && u_size == 0) {
989 /* Remove "rs &&" later. This check should always be active, but
990 right now the receiver expects the permissive behavior */
991 drbd_warn(device, "Implicit shrink not allowed. "
992 "Use --size=%llus for explicit shrink.\n",
993 (unsigned long long)size);
994 rv = DS_ERROR_SHRINK;
997 rv = DS_ERROR_SPACE_MD;
998 if (rv != DS_UNCHANGED)
1002 if (get_capacity(device->vdisk) != size ||
1003 drbd_bm_capacity(device) != size) {
1005 err = drbd_bm_resize(device, size, !(flags & DDSF_NO_RESYNC));
1006 if (unlikely(err)) {
1007 /* currently there is only one error: ENOMEM! */
1008 size = drbd_bm_capacity(device);
1010 drbd_err(device, "OUT OF MEMORY! "
1011 "Could not allocate bitmap!\n");
1013 drbd_err(device, "BM resizing failed. "
1014 "Leaving size unchanged\n");
1018 /* racy, see comments above. */
1019 drbd_set_my_capacity(device, size);
1020 md->la_size_sect = size;
1025 la_size_changed = (prev.last_agreed_sect != md->la_size_sect);
1027 md_moved = prev.md_offset != md->md_offset
1028 || prev.md_size_sect != md->md_size_sect;
1030 if (la_size_changed || md_moved || rs) {
1033 /* We do some synchronous IO below, which may take some time.
1034 * Clear the timer, to avoid scary "timer expired!" messages,
1035 * "Superblock" is written out at least twice below, anyways. */
1036 del_timer(&device->md_sync_timer);
1038 /* We won't change the "al-extents" setting, we just may need
1039 * to move the on-disk location of the activity log ringbuffer.
1040 * Lock for transaction is good enough, it may well be "dirty"
1041 * or even "starving". */
1042 wait_event(device->al_wait, lc_try_lock_for_transaction(device->act_log));
1044 /* mark current on-disk bitmap and activity log as unreliable */
1045 prev_flags = md->flags;
1046 md->flags |= MDF_FULL_SYNC | MDF_AL_DISABLED;
1047 drbd_md_write(device, buffer);
1049 drbd_al_initialize(device, buffer);
1051 drbd_info(device, "Writing the whole bitmap, %s\n",
1052 la_size_changed && md_moved ? "size changed and md moved" :
1053 la_size_changed ? "size changed" : "md moved");
1054 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
1055 drbd_bitmap_io(device, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
1056 "size changed", BM_LOCKED_MASK, NULL);
1058 /* on-disk bitmap and activity log is authoritative again
1059 * (unless there was an IO error meanwhile...) */
1060 md->flags = prev_flags;
1061 drbd_md_write(device, buffer);
1064 drbd_info(device, "Changed AL layout to al-stripes = %d, al-stripe-size-kB = %d\n",
1065 md->al_stripes, md->al_stripe_size_4k * 4);
1068 if (size > prev.last_agreed_sect)
1069 rv = prev.last_agreed_sect ? DS_GREW : DS_GREW_FROM_ZERO;
1070 if (size < prev.last_agreed_sect)
1075 /* restore previous offset and sizes */
1076 md->la_size_sect = prev.last_agreed_sect;
1077 md->md_offset = prev.md_offset;
1078 md->al_offset = prev.al_offset;
1079 md->bm_offset = prev.bm_offset;
1080 md->md_size_sect = prev.md_size_sect;
1081 md->al_stripes = prev.al_stripes;
1082 md->al_stripe_size_4k = prev.al_stripe_size_4k;
1083 md->al_size_4k = (u64)prev.al_stripes * prev.al_stripe_size_4k;
1085 lc_unlock(device->act_log);
1086 wake_up(&device->al_wait);
1087 drbd_md_put_buffer(device);
1088 drbd_resume_io(device);
1094 drbd_new_dev_size(struct drbd_device *device, struct drbd_backing_dev *bdev,
1095 sector_t u_size, int assume_peer_has_space)
1097 sector_t p_size = device->p_size; /* partner's disk size. */
1098 sector_t la_size_sect = bdev->md.la_size_sect; /* last agreed size. */
1099 sector_t m_size; /* my size */
1102 m_size = drbd_get_max_capacity(bdev);
1104 if (device->state.conn < C_CONNECTED && assume_peer_has_space) {
1105 drbd_warn(device, "Resize while not connected was forced by the user!\n");
1109 if (p_size && m_size) {
1110 size = min_t(sector_t, p_size, m_size);
1113 size = la_size_sect;
1114 if (m_size && m_size < size)
1116 if (p_size && p_size < size)
1127 drbd_err(device, "Both nodes diskless!\n");
1131 drbd_err(device, "Requested disk size is too big (%lu > %lu)\n",
1132 (unsigned long)u_size>>1, (unsigned long)size>>1);
1141 * drbd_check_al_size() - Ensures that the AL is of the right size
1142 * @device: DRBD device.
1144 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
1145 * failed, and 0 on success. You should call drbd_md_sync() after you called
1148 static int drbd_check_al_size(struct drbd_device *device, struct disk_conf *dc)
1150 struct lru_cache *n, *t;
1151 struct lc_element *e;
1152 unsigned int in_use;
1155 if (device->act_log &&
1156 device->act_log->nr_elements == dc->al_extents)
1160 t = device->act_log;
1161 n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
1162 dc->al_extents, sizeof(struct lc_element), 0);
1165 drbd_err(device, "Cannot allocate act_log lru!\n");
1168 spin_lock_irq(&device->al_lock);
1170 for (i = 0; i < t->nr_elements; i++) {
1171 e = lc_element_by_index(t, i);
1173 drbd_err(device, "refcnt(%d)==%d\n",
1174 e->lc_number, e->refcnt);
1175 in_use += e->refcnt;
1179 device->act_log = n;
1180 spin_unlock_irq(&device->al_lock);
1182 drbd_err(device, "Activity log still in use!\n");
1188 drbd_md_mark_dirty(device); /* we changed device->act_log->nr_elemens */
1192 static void blk_queue_discard_granularity(struct request_queue *q, unsigned int granularity)
1194 q->limits.discard_granularity = granularity;
1197 static unsigned int drbd_max_discard_sectors(struct drbd_connection *connection)
1199 /* when we introduced REQ_WRITE_SAME support, we also bumped
1200 * our maximum supported batch bio size used for discards. */
1201 if (connection->agreed_features & DRBD_FF_WSAME)
1202 return DRBD_MAX_BBIO_SECTORS;
1203 /* before, with DRBD <= 8.4.6, we only allowed up to one AL_EXTENT_SIZE. */
1204 return AL_EXTENT_SIZE >> 9;
1207 static void decide_on_discard_support(struct drbd_device *device,
1208 struct drbd_backing_dev *bdev)
1210 struct drbd_connection *connection =
1211 first_peer_device(device)->connection;
1212 struct request_queue *q = device->rq_queue;
1213 unsigned int max_discard_sectors;
1215 if (bdev && !bdev_max_discard_sectors(bdev->backing_bdev))
1218 if (connection->cstate >= C_CONNECTED &&
1219 !(connection->agreed_features & DRBD_FF_TRIM)) {
1220 drbd_info(connection,
1221 "peer DRBD too old, does not support TRIM: disabling discards\n");
1226 * We don't care for the granularity, really.
1228 * Stacking limits below should fix it for the local device. Whether or
1229 * not it is a suitable granularity on the remote device is not our
1230 * problem, really. If you care, you need to use devices with similar
1231 * topology on all peers.
1233 blk_queue_discard_granularity(q, 512);
1234 max_discard_sectors = drbd_max_discard_sectors(connection);
1235 blk_queue_max_discard_sectors(q, max_discard_sectors);
1236 blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
1240 blk_queue_discard_granularity(q, 0);
1241 blk_queue_max_discard_sectors(q, 0);
1244 static void fixup_write_zeroes(struct drbd_device *device, struct request_queue *q)
1246 /* Fixup max_write_zeroes_sectors after blk_stack_limits():
1247 * if we can handle "zeroes" efficiently on the protocol,
1248 * we want to do that, even if our backend does not announce
1249 * max_write_zeroes_sectors itself. */
1250 struct drbd_connection *connection = first_peer_device(device)->connection;
1251 /* If the peer announces WZEROES support, use it. Otherwise, rather
1252 * send explicit zeroes than rely on some discard-zeroes-data magic. */
1253 if (connection->agreed_features & DRBD_FF_WZEROES)
1254 q->limits.max_write_zeroes_sectors = DRBD_MAX_BBIO_SECTORS;
1256 q->limits.max_write_zeroes_sectors = 0;
1259 static void fixup_discard_support(struct drbd_device *device, struct request_queue *q)
1261 unsigned int max_discard = device->rq_queue->limits.max_discard_sectors;
1262 unsigned int discard_granularity =
1263 device->rq_queue->limits.discard_granularity >> SECTOR_SHIFT;
1265 if (discard_granularity > max_discard) {
1266 blk_queue_discard_granularity(q, 0);
1267 blk_queue_max_discard_sectors(q, 0);
1271 static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backing_dev *bdev,
1272 unsigned int max_bio_size, struct o_qlim *o)
1274 struct request_queue * const q = device->rq_queue;
1275 unsigned int max_hw_sectors = max_bio_size >> 9;
1276 unsigned int max_segments = 0;
1277 struct request_queue *b = NULL;
1278 struct disk_conf *dc;
1281 b = bdev->backing_bdev->bd_disk->queue;
1283 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
1285 dc = rcu_dereference(device->ldev->disk_conf);
1286 max_segments = dc->max_bio_bvecs;
1289 blk_set_stacking_limits(&q->limits);
1292 blk_queue_max_hw_sectors(q, max_hw_sectors);
1293 /* This is the workaround for "bio would need to, but cannot, be split" */
1294 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1295 blk_queue_segment_boundary(q, PAGE_SIZE-1);
1296 decide_on_discard_support(device, bdev);
1299 blk_stack_limits(&q->limits, &b->limits, 0);
1300 disk_update_readahead(device->vdisk);
1302 fixup_write_zeroes(device, q);
1303 fixup_discard_support(device, q);
1306 void drbd_reconsider_queue_parameters(struct drbd_device *device, struct drbd_backing_dev *bdev, struct o_qlim *o)
1308 unsigned int now, new, local, peer;
1310 now = queue_max_hw_sectors(device->rq_queue) << 9;
1311 local = device->local_max_bio_size; /* Eventually last known value, from volatile memory */
1312 peer = device->peer_max_bio_size; /* Eventually last known value, from meta data */
1315 local = queue_max_hw_sectors(bdev->backing_bdev->bd_disk->queue) << 9;
1316 device->local_max_bio_size = local;
1318 local = min(local, DRBD_MAX_BIO_SIZE);
1320 /* We may ignore peer limits if the peer is modern enough.
1321 Because new from 8.3.8 onwards the peer can use multiple
1322 BIOs for a single peer_request */
1323 if (device->state.conn >= C_WF_REPORT_PARAMS) {
1324 if (first_peer_device(device)->connection->agreed_pro_version < 94)
1325 peer = min(device->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
1326 /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
1327 else if (first_peer_device(device)->connection->agreed_pro_version == 94)
1328 peer = DRBD_MAX_SIZE_H80_PACKET;
1329 else if (first_peer_device(device)->connection->agreed_pro_version < 100)
1330 peer = DRBD_MAX_BIO_SIZE_P95; /* drbd 8.3.8 onwards, before 8.4.0 */
1332 peer = DRBD_MAX_BIO_SIZE;
1334 /* We may later detach and re-attach on a disconnected Primary.
1335 * Avoid this setting to jump back in that case.
1336 * We want to store what we know the peer DRBD can handle,
1337 * not what the peer IO backend can handle. */
1338 if (peer > device->peer_max_bio_size)
1339 device->peer_max_bio_size = peer;
1341 new = min(local, peer);
1343 if (device->state.role == R_PRIMARY && new < now)
1344 drbd_err(device, "ASSERT FAILED new < now; (%u < %u)\n", new, now);
1347 drbd_info(device, "max BIO size = %u\n", new);
1349 drbd_setup_queue_param(device, bdev, new, o);
1352 /* Starts the worker thread */
1353 static void conn_reconfig_start(struct drbd_connection *connection)
1355 drbd_thread_start(&connection->worker);
1356 drbd_flush_workqueue(&connection->sender_work);
1359 /* if still unconfigured, stops worker again. */
1360 static void conn_reconfig_done(struct drbd_connection *connection)
1363 spin_lock_irq(&connection->resource->req_lock);
1364 stop_threads = conn_all_vols_unconf(connection) &&
1365 connection->cstate == C_STANDALONE;
1366 spin_unlock_irq(&connection->resource->req_lock);
1368 /* ack_receiver thread and ack_sender workqueue are implicitly
1369 * stopped by receiver in conn_disconnect() */
1370 drbd_thread_stop(&connection->receiver);
1371 drbd_thread_stop(&connection->worker);
1375 /* Make sure IO is suspended before calling this function(). */
1376 static void drbd_suspend_al(struct drbd_device *device)
1380 if (!lc_try_lock(device->act_log)) {
1381 drbd_warn(device, "Failed to lock al in drbd_suspend_al()\n");
1385 drbd_al_shrink(device);
1386 spin_lock_irq(&device->resource->req_lock);
1387 if (device->state.conn < C_CONNECTED)
1388 s = !test_and_set_bit(AL_SUSPENDED, &device->flags);
1389 spin_unlock_irq(&device->resource->req_lock);
1390 lc_unlock(device->act_log);
1393 drbd_info(device, "Suspended AL updates\n");
1397 static bool should_set_defaults(struct genl_info *info)
1399 unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1400 return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1403 static unsigned int drbd_al_extents_max(struct drbd_backing_dev *bdev)
1405 /* This is limited by 16 bit "slot" numbers,
1406 * and by available on-disk context storage.
1408 * Also (u16)~0 is special (denotes a "free" extent).
1410 * One transaction occupies one 4kB on-disk block,
1411 * we have n such blocks in the on disk ring buffer,
1412 * the "current" transaction may fail (n-1),
1413 * and there is 919 slot numbers context information per transaction.
1415 * 72 transaction blocks amounts to more than 2**16 context slots,
1416 * so cap there first.
1418 const unsigned int max_al_nr = DRBD_AL_EXTENTS_MAX;
1419 const unsigned int sufficient_on_disk =
1420 (max_al_nr + AL_CONTEXT_PER_TRANSACTION -1)
1421 /AL_CONTEXT_PER_TRANSACTION;
1423 unsigned int al_size_4k = bdev->md.al_size_4k;
1425 if (al_size_4k > sufficient_on_disk)
1428 return (al_size_4k - 1) * AL_CONTEXT_PER_TRANSACTION;
1431 static bool write_ordering_changed(struct disk_conf *a, struct disk_conf *b)
1433 return a->disk_barrier != b->disk_barrier ||
1434 a->disk_flushes != b->disk_flushes ||
1435 a->disk_drain != b->disk_drain;
1438 static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf *disk_conf,
1439 struct drbd_backing_dev *nbc)
1441 struct block_device *bdev = nbc->backing_bdev;
1443 if (disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
1444 disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
1445 if (disk_conf->al_extents > drbd_al_extents_max(nbc))
1446 disk_conf->al_extents = drbd_al_extents_max(nbc);
1448 if (!bdev_max_discard_sectors(bdev)) {
1449 if (disk_conf->rs_discard_granularity) {
1450 disk_conf->rs_discard_granularity = 0; /* disable feature */
1451 drbd_info(device, "rs_discard_granularity feature disabled\n");
1455 if (disk_conf->rs_discard_granularity) {
1456 int orig_value = disk_conf->rs_discard_granularity;
1457 sector_t discard_size = bdev_max_discard_sectors(bdev) << 9;
1458 unsigned int discard_granularity = bdev_discard_granularity(bdev);
1461 if (discard_granularity > disk_conf->rs_discard_granularity)
1462 disk_conf->rs_discard_granularity = discard_granularity;
1464 remainder = disk_conf->rs_discard_granularity %
1465 discard_granularity;
1466 disk_conf->rs_discard_granularity += remainder;
1468 if (disk_conf->rs_discard_granularity > discard_size)
1469 disk_conf->rs_discard_granularity = discard_size;
1471 if (disk_conf->rs_discard_granularity != orig_value)
1472 drbd_info(device, "rs_discard_granularity changed to %d\n",
1473 disk_conf->rs_discard_granularity);
1477 static int disk_opts_check_al_size(struct drbd_device *device, struct disk_conf *dc)
1481 if (device->act_log &&
1482 device->act_log->nr_elements == dc->al_extents)
1485 drbd_suspend_io(device);
1486 /* If IO completion is currently blocked, we would likely wait
1487 * "forever" for the activity log to become unused. So we don't. */
1488 if (atomic_read(&device->ap_bio_cnt))
1491 wait_event(device->al_wait, lc_try_lock(device->act_log));
1492 drbd_al_shrink(device);
1493 err = drbd_check_al_size(device, dc);
1494 lc_unlock(device->act_log);
1495 wake_up(&device->al_wait);
1497 drbd_resume_io(device);
1501 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1503 struct drbd_config_context adm_ctx;
1504 enum drbd_ret_code retcode;
1505 struct drbd_device *device;
1506 struct disk_conf *new_disk_conf, *old_disk_conf;
1507 struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
1509 unsigned int fifo_size;
1511 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
1512 if (!adm_ctx.reply_skb)
1514 if (retcode != NO_ERROR)
1517 device = adm_ctx.device;
1518 mutex_lock(&adm_ctx.resource->adm_mutex);
1520 /* we also need a disk
1521 * to change the options on */
1522 if (!get_ldev(device)) {
1523 retcode = ERR_NO_DISK;
1527 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
1528 if (!new_disk_conf) {
1529 retcode = ERR_NOMEM;
1533 mutex_lock(&device->resource->conf_update);
1534 old_disk_conf = device->ldev->disk_conf;
1535 *new_disk_conf = *old_disk_conf;
1536 if (should_set_defaults(info))
1537 set_disk_conf_defaults(new_disk_conf);
1539 err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1540 if (err && err != -ENOMSG) {
1541 retcode = ERR_MANDATORY_TAG;
1542 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
1546 if (!expect(device, new_disk_conf->resync_rate >= 1))
1547 new_disk_conf->resync_rate = 1;
1549 sanitize_disk_conf(device, new_disk_conf, device->ldev);
1551 if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1552 new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1554 fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1555 if (fifo_size != device->rs_plan_s->size) {
1556 new_plan = fifo_alloc(fifo_size);
1558 drbd_err(device, "kmalloc of fifo_buffer failed");
1559 retcode = ERR_NOMEM;
1564 err = disk_opts_check_al_size(device, new_disk_conf);
1566 /* Could be just "busy". Ignore?
1567 * Introduce dedicated error code? */
1568 drbd_msg_put_info(adm_ctx.reply_skb,
1569 "Try again without changing current al-extents setting");
1570 retcode = ERR_NOMEM;
1574 lock_all_resources();
1575 retcode = drbd_resync_after_valid(device, new_disk_conf->resync_after);
1576 if (retcode == NO_ERROR) {
1577 rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
1578 drbd_resync_after_changed(device);
1580 unlock_all_resources();
1582 if (retcode != NO_ERROR)
1586 old_plan = device->rs_plan_s;
1587 rcu_assign_pointer(device->rs_plan_s, new_plan);
1590 mutex_unlock(&device->resource->conf_update);
1592 if (new_disk_conf->al_updates)
1593 device->ldev->md.flags &= ~MDF_AL_DISABLED;
1595 device->ldev->md.flags |= MDF_AL_DISABLED;
1597 if (new_disk_conf->md_flushes)
1598 clear_bit(MD_NO_FUA, &device->flags);
1600 set_bit(MD_NO_FUA, &device->flags);
1602 if (write_ordering_changed(old_disk_conf, new_disk_conf))
1603 drbd_bump_write_ordering(device->resource, NULL, WO_BDEV_FLUSH);
1605 if (old_disk_conf->discard_zeroes_if_aligned !=
1606 new_disk_conf->discard_zeroes_if_aligned)
1607 drbd_reconsider_queue_parameters(device, device->ldev, NULL);
1609 drbd_md_sync(device);
1611 if (device->state.conn >= C_CONNECTED) {
1612 struct drbd_peer_device *peer_device;
1614 for_each_peer_device(peer_device, device)
1615 drbd_send_sync_param(peer_device);
1618 kvfree_rcu_mightsleep(old_disk_conf);
1620 mod_timer(&device->request_timer, jiffies + HZ);
1624 mutex_unlock(&device->resource->conf_update);
1626 kfree(new_disk_conf);
1631 mutex_unlock(&adm_ctx.resource->adm_mutex);
1633 drbd_adm_finish(&adm_ctx, info, retcode);
1637 static struct block_device *open_backing_dev(struct drbd_device *device,
1638 const char *bdev_path, void *claim_ptr, bool do_bd_link)
1640 struct block_device *bdev;
1643 bdev = blkdev_get_by_path(bdev_path,
1644 FMODE_READ | FMODE_WRITE | FMODE_EXCL, claim_ptr);
1646 drbd_err(device, "open(\"%s\") failed with %ld\n",
1647 bdev_path, PTR_ERR(bdev));
1654 err = bd_link_disk_holder(bdev, device->vdisk);
1656 blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1657 drbd_err(device, "bd_link_disk_holder(\"%s\", ...) failed with %d\n",
1659 bdev = ERR_PTR(err);
1664 static int open_backing_devices(struct drbd_device *device,
1665 struct disk_conf *new_disk_conf,
1666 struct drbd_backing_dev *nbc)
1668 struct block_device *bdev;
1670 bdev = open_backing_dev(device, new_disk_conf->backing_dev, device, true);
1672 return ERR_OPEN_DISK;
1673 nbc->backing_bdev = bdev;
1676 * meta_dev_idx >= 0: external fixed size, possibly multiple
1677 * drbd sharing one meta device. TODO in that case, paranoia
1678 * check that [md_bdev, meta_dev_idx] is not yet used by some
1679 * other drbd minor! (if you use drbd.conf + drbdadm, that
1680 * should check it for you already; but if you don't, or
1681 * someone fooled it, we need to double check here)
1683 bdev = open_backing_dev(device, new_disk_conf->meta_dev,
1684 /* claim ptr: device, if claimed exclusively; shared drbd_m_holder,
1685 * if potentially shared with other drbd minors */
1686 (new_disk_conf->meta_dev_idx < 0) ? (void*)device : (void*)drbd_m_holder,
1687 /* avoid double bd_claim_by_disk() for the same (source,target) tuple,
1688 * as would happen with internal metadata. */
1689 (new_disk_conf->meta_dev_idx != DRBD_MD_INDEX_FLEX_INT &&
1690 new_disk_conf->meta_dev_idx != DRBD_MD_INDEX_INTERNAL));
1692 return ERR_OPEN_MD_DISK;
1693 nbc->md_bdev = bdev;
1697 static void close_backing_dev(struct drbd_device *device, struct block_device *bdev,
1703 bd_unlink_disk_holder(bdev, device->vdisk);
1704 blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1707 void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *ldev)
1712 close_backing_dev(device, ldev->md_bdev, ldev->md_bdev != ldev->backing_bdev);
1713 close_backing_dev(device, ldev->backing_bdev, true);
1715 kfree(ldev->disk_conf);
1719 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1721 struct drbd_config_context adm_ctx;
1722 struct drbd_device *device;
1723 struct drbd_peer_device *peer_device;
1724 struct drbd_connection *connection;
1726 enum drbd_ret_code retcode;
1727 enum determine_dev_size dd;
1728 sector_t max_possible_sectors;
1729 sector_t min_md_device_sectors;
1730 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1731 struct disk_conf *new_disk_conf = NULL;
1732 struct lru_cache *resync_lru = NULL;
1733 struct fifo_buffer *new_plan = NULL;
1734 union drbd_state ns, os;
1735 enum drbd_state_rv rv;
1736 struct net_conf *nc;
1738 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
1739 if (!adm_ctx.reply_skb)
1741 if (retcode != NO_ERROR)
1744 device = adm_ctx.device;
1745 mutex_lock(&adm_ctx.resource->adm_mutex);
1746 peer_device = first_peer_device(device);
1747 connection = peer_device->connection;
1748 conn_reconfig_start(connection);
1750 /* if you want to reconfigure, please tear down first */
1751 if (device->state.disk > D_DISKLESS) {
1752 retcode = ERR_DISK_CONFIGURED;
1755 /* It may just now have detached because of IO error. Make sure
1756 * drbd_ldev_destroy is done already, we may end up here very fast,
1757 * e.g. if someone calls attach from the on-io-error handler,
1758 * to realize a "hot spare" feature (not that I'd recommend that) */
1759 wait_event(device->misc_wait, !test_bit(GOING_DISKLESS, &device->flags));
1761 /* make sure there is no leftover from previous force-detach attempts */
1762 clear_bit(FORCE_DETACH, &device->flags);
1763 clear_bit(WAS_IO_ERROR, &device->flags);
1764 clear_bit(WAS_READ_ERROR, &device->flags);
1766 /* and no leftover from previously aborted resync or verify, either */
1767 device->rs_total = 0;
1768 device->rs_failed = 0;
1769 atomic_set(&device->rs_pending_cnt, 0);
1771 /* allocation not in the IO path, drbdsetup context */
1772 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1774 retcode = ERR_NOMEM;
1777 spin_lock_init(&nbc->md.uuid_lock);
1779 new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1780 if (!new_disk_conf) {
1781 retcode = ERR_NOMEM;
1784 nbc->disk_conf = new_disk_conf;
1786 set_disk_conf_defaults(new_disk_conf);
1787 err = disk_conf_from_attrs(new_disk_conf, info);
1789 retcode = ERR_MANDATORY_TAG;
1790 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
1794 if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1795 new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1797 new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1799 retcode = ERR_NOMEM;
1803 if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1804 retcode = ERR_MD_IDX_INVALID;
1809 nc = rcu_dereference(connection->net_conf);
1811 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1813 retcode = ERR_STONITH_AND_PROT_A;
1819 retcode = open_backing_devices(device, new_disk_conf, nbc);
1820 if (retcode != NO_ERROR)
1823 if ((nbc->backing_bdev == nbc->md_bdev) !=
1824 (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1825 new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1826 retcode = ERR_MD_IDX_INVALID;
1830 resync_lru = lc_create("resync", drbd_bm_ext_cache,
1831 1, 61, sizeof(struct bm_extent),
1832 offsetof(struct bm_extent, lce));
1834 retcode = ERR_NOMEM;
1838 /* Read our meta data super block early.
1839 * This also sets other on-disk offsets. */
1840 retcode = drbd_md_read(device, nbc);
1841 if (retcode != NO_ERROR)
1844 sanitize_disk_conf(device, new_disk_conf, nbc);
1846 if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
1847 drbd_err(device, "max capacity %llu smaller than disk size %llu\n",
1848 (unsigned long long) drbd_get_max_capacity(nbc),
1849 (unsigned long long) new_disk_conf->disk_size);
1850 retcode = ERR_DISK_TOO_SMALL;
1854 if (new_disk_conf->meta_dev_idx < 0) {
1855 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1856 /* at least one MB, otherwise it does not make sense */
1857 min_md_device_sectors = (2<<10);
1859 max_possible_sectors = DRBD_MAX_SECTORS;
1860 min_md_device_sectors = MD_128MB_SECT * (new_disk_conf->meta_dev_idx + 1);
1863 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1864 retcode = ERR_MD_DISK_TOO_SMALL;
1865 drbd_warn(device, "refusing attach: md-device too small, "
1866 "at least %llu sectors needed for this meta-disk type\n",
1867 (unsigned long long) min_md_device_sectors);
1871 /* Make sure the new disk is big enough
1872 * (we may currently be R_PRIMARY with no local disk...) */
1873 if (drbd_get_max_capacity(nbc) < get_capacity(device->vdisk)) {
1874 retcode = ERR_DISK_TOO_SMALL;
1878 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1880 if (nbc->known_size > max_possible_sectors) {
1881 drbd_warn(device, "==> truncating very big lower level device "
1882 "to currently maximum possible %llu sectors <==\n",
1883 (unsigned long long) max_possible_sectors);
1884 if (new_disk_conf->meta_dev_idx >= 0)
1885 drbd_warn(device, "==>> using internal or flexible "
1886 "meta data may help <<==\n");
1889 drbd_suspend_io(device);
1890 /* also wait for the last barrier ack. */
1891 /* FIXME see also https://daiquiri.linbit/cgi-bin/bugzilla/show_bug.cgi?id=171
1892 * We need a way to either ignore barrier acks for barriers sent before a device
1893 * was attached, or a way to wait for all pending barrier acks to come in.
1894 * As barriers are counted per resource,
1895 * we'd need to suspend io on all devices of a resource.
1897 wait_event(device->misc_wait, !atomic_read(&device->ap_pending_cnt) || drbd_suspended(device));
1898 /* and for any other previously queued work */
1899 drbd_flush_workqueue(&connection->sender_work);
1901 rv = _drbd_request_state(device, NS(disk, D_ATTACHING), CS_VERBOSE);
1902 retcode = (enum drbd_ret_code)rv;
1903 drbd_resume_io(device);
1904 if (rv < SS_SUCCESS)
1907 if (!get_ldev_if_state(device, D_ATTACHING))
1908 goto force_diskless;
1910 if (!device->bitmap) {
1911 if (drbd_bm_init(device)) {
1912 retcode = ERR_NOMEM;
1913 goto force_diskless_dec;
1917 if (device->state.pdsk != D_UP_TO_DATE && device->ed_uuid &&
1918 (device->state.role == R_PRIMARY || device->state.peer == R_PRIMARY) &&
1919 (device->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1920 drbd_err(device, "Can only attach to data with current UUID=%016llX\n",
1921 (unsigned long long)device->ed_uuid);
1922 retcode = ERR_DATA_NOT_CURRENT;
1923 goto force_diskless_dec;
1926 /* Since we are diskless, fix the activity log first... */
1927 if (drbd_check_al_size(device, new_disk_conf)) {
1928 retcode = ERR_NOMEM;
1929 goto force_diskless_dec;
1932 /* Prevent shrinking of consistent devices ! */
1934 unsigned long long nsz = drbd_new_dev_size(device, nbc, nbc->disk_conf->disk_size, 0);
1935 unsigned long long eff = nbc->md.la_size_sect;
1936 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) && nsz < eff) {
1937 if (nsz == nbc->disk_conf->disk_size) {
1938 drbd_warn(device, "truncating a consistent device during attach (%llu < %llu)\n", nsz, eff);
1940 drbd_warn(device, "refusing to truncate a consistent device (%llu < %llu)\n", nsz, eff);
1941 drbd_msg_sprintf_info(adm_ctx.reply_skb,
1942 "To-be-attached device has last effective > current size, and is consistent\n"
1943 "(%llu > %llu sectors). Refusing to attach.", eff, nsz);
1944 retcode = ERR_IMPLICIT_SHRINK;
1945 goto force_diskless_dec;
1950 lock_all_resources();
1951 retcode = drbd_resync_after_valid(device, new_disk_conf->resync_after);
1952 if (retcode != NO_ERROR) {
1953 unlock_all_resources();
1954 goto force_diskless_dec;
1957 /* Reset the "barriers don't work" bits here, then force meta data to
1958 * be written, to ensure we determine if barriers are supported. */
1959 if (new_disk_conf->md_flushes)
1960 clear_bit(MD_NO_FUA, &device->flags);
1962 set_bit(MD_NO_FUA, &device->flags);
1964 /* Point of no return reached.
1965 * Devices and memory are no longer released by error cleanup below.
1966 * now device takes over responsibility, and the state engine should
1967 * clean it up somewhere. */
1968 D_ASSERT(device, device->ldev == NULL);
1970 device->resync = resync_lru;
1971 device->rs_plan_s = new_plan;
1974 new_disk_conf = NULL;
1977 drbd_resync_after_changed(device);
1978 drbd_bump_write_ordering(device->resource, device->ldev, WO_BDEV_FLUSH);
1979 unlock_all_resources();
1981 if (drbd_md_test_flag(device->ldev, MDF_CRASHED_PRIMARY))
1982 set_bit(CRASHED_PRIMARY, &device->flags);
1984 clear_bit(CRASHED_PRIMARY, &device->flags);
1986 if (drbd_md_test_flag(device->ldev, MDF_PRIMARY_IND) &&
1987 !(device->state.role == R_PRIMARY && device->resource->susp_nod))
1988 set_bit(CRASHED_PRIMARY, &device->flags);
1990 device->send_cnt = 0;
1991 device->recv_cnt = 0;
1992 device->read_cnt = 0;
1993 device->writ_cnt = 0;
1995 drbd_reconsider_queue_parameters(device, device->ldev, NULL);
1997 /* If I am currently not R_PRIMARY,
1998 * but meta data primary indicator is set,
1999 * I just now recover from a hard crash,
2000 * and have been R_PRIMARY before that crash.
2002 * Now, if I had no connection before that crash
2003 * (have been degraded R_PRIMARY), chances are that
2004 * I won't find my peer now either.
2006 * In that case, and _only_ in that case,
2007 * we use the degr-wfc-timeout instead of the default,
2008 * so we can automatically recover from a crash of a
2009 * degraded but active "cluster" after a certain timeout.
2011 clear_bit(USE_DEGR_WFC_T, &device->flags);
2012 if (device->state.role != R_PRIMARY &&
2013 drbd_md_test_flag(device->ldev, MDF_PRIMARY_IND) &&
2014 !drbd_md_test_flag(device->ldev, MDF_CONNECTED_IND))
2015 set_bit(USE_DEGR_WFC_T, &device->flags);
2017 dd = drbd_determine_dev_size(device, 0, NULL);
2018 if (dd <= DS_ERROR) {
2019 retcode = ERR_NOMEM_BITMAP;
2020 goto force_diskless_dec;
2021 } else if (dd == DS_GREW)
2022 set_bit(RESYNC_AFTER_NEG, &device->flags);
2024 if (drbd_md_test_flag(device->ldev, MDF_FULL_SYNC) ||
2025 (test_bit(CRASHED_PRIMARY, &device->flags) &&
2026 drbd_md_test_flag(device->ldev, MDF_AL_DISABLED))) {
2027 drbd_info(device, "Assuming that all blocks are out of sync "
2028 "(aka FullSync)\n");
2029 if (drbd_bitmap_io(device, &drbd_bmio_set_n_write,
2030 "set_n_write from attaching", BM_LOCKED_MASK,
2032 retcode = ERR_IO_MD_DISK;
2033 goto force_diskless_dec;
2036 if (drbd_bitmap_io(device, &drbd_bm_read,
2037 "read from attaching", BM_LOCKED_MASK,
2039 retcode = ERR_IO_MD_DISK;
2040 goto force_diskless_dec;
2044 if (_drbd_bm_total_weight(device) == drbd_bm_bits(device))
2045 drbd_suspend_al(device); /* IO is still suspended here... */
2047 spin_lock_irq(&device->resource->req_lock);
2048 os = drbd_read_state(device);
2050 /* If MDF_CONSISTENT is not set go into inconsistent state,
2051 otherwise investigate MDF_WasUpToDate...
2052 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
2053 otherwise into D_CONSISTENT state.
2055 if (drbd_md_test_flag(device->ldev, MDF_CONSISTENT)) {
2056 if (drbd_md_test_flag(device->ldev, MDF_WAS_UP_TO_DATE))
2057 ns.disk = D_CONSISTENT;
2059 ns.disk = D_OUTDATED;
2061 ns.disk = D_INCONSISTENT;
2064 if (drbd_md_test_flag(device->ldev, MDF_PEER_OUT_DATED))
2065 ns.pdsk = D_OUTDATED;
2068 if (ns.disk == D_CONSISTENT &&
2069 (ns.pdsk == D_OUTDATED || rcu_dereference(device->ldev->disk_conf)->fencing == FP_DONT_CARE))
2070 ns.disk = D_UP_TO_DATE;
2072 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
2073 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
2074 this point, because drbd_request_state() modifies these
2077 if (rcu_dereference(device->ldev->disk_conf)->al_updates)
2078 device->ldev->md.flags &= ~MDF_AL_DISABLED;
2080 device->ldev->md.flags |= MDF_AL_DISABLED;
2084 /* In case we are C_CONNECTED postpone any decision on the new disk
2085 state after the negotiation phase. */
2086 if (device->state.conn == C_CONNECTED) {
2087 device->new_state_tmp.i = ns.i;
2089 ns.disk = D_NEGOTIATING;
2091 /* We expect to receive up-to-date UUIDs soon.
2092 To avoid a race in receive_state, free p_uuid while
2093 holding req_lock. I.e. atomic with the state change */
2094 kfree(device->p_uuid);
2095 device->p_uuid = NULL;
2098 rv = _drbd_set_state(device, ns, CS_VERBOSE, NULL);
2099 spin_unlock_irq(&device->resource->req_lock);
2101 if (rv < SS_SUCCESS)
2102 goto force_diskless_dec;
2104 mod_timer(&device->request_timer, jiffies + HZ);
2106 if (device->state.role == R_PRIMARY)
2107 device->ldev->md.uuid[UI_CURRENT] |= (u64)1;
2109 device->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
2111 drbd_md_mark_dirty(device);
2112 drbd_md_sync(device);
2114 kobject_uevent(&disk_to_dev(device->vdisk)->kobj, KOBJ_CHANGE);
2116 conn_reconfig_done(connection);
2117 mutex_unlock(&adm_ctx.resource->adm_mutex);
2118 drbd_adm_finish(&adm_ctx, info, retcode);
2124 drbd_force_state(device, NS(disk, D_DISKLESS));
2125 drbd_md_sync(device);
2127 conn_reconfig_done(connection);
2129 close_backing_dev(device, nbc->md_bdev, nbc->md_bdev != nbc->backing_bdev);
2130 close_backing_dev(device, nbc->backing_bdev, true);
2133 kfree(new_disk_conf);
2134 lc_destroy(resync_lru);
2136 mutex_unlock(&adm_ctx.resource->adm_mutex);
2138 drbd_adm_finish(&adm_ctx, info, retcode);
2142 static int adm_detach(struct drbd_device *device, int force)
2145 set_bit(FORCE_DETACH, &device->flags);
2146 drbd_force_state(device, NS(disk, D_FAILED));
2150 return drbd_request_detach_interruptible(device);
2153 /* Detaching the disk is a process in multiple stages. First we need to lock
2154 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
2155 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
2156 * internal references as well.
2157 * Only then we have finally detached. */
2158 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
2160 struct drbd_config_context adm_ctx;
2161 enum drbd_ret_code retcode;
2162 struct detach_parms parms = { };
2165 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2166 if (!adm_ctx.reply_skb)
2168 if (retcode != NO_ERROR)
2171 if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
2172 err = detach_parms_from_attrs(&parms, info);
2174 retcode = ERR_MANDATORY_TAG;
2175 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2180 mutex_lock(&adm_ctx.resource->adm_mutex);
2181 retcode = adm_detach(adm_ctx.device, parms.force_detach);
2182 mutex_unlock(&adm_ctx.resource->adm_mutex);
2184 drbd_adm_finish(&adm_ctx, info, retcode);
2188 static bool conn_resync_running(struct drbd_connection *connection)
2190 struct drbd_peer_device *peer_device;
2195 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
2196 struct drbd_device *device = peer_device->device;
2197 if (device->state.conn == C_SYNC_SOURCE ||
2198 device->state.conn == C_SYNC_TARGET ||
2199 device->state.conn == C_PAUSED_SYNC_S ||
2200 device->state.conn == C_PAUSED_SYNC_T) {
2210 static bool conn_ov_running(struct drbd_connection *connection)
2212 struct drbd_peer_device *peer_device;
2217 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
2218 struct drbd_device *device = peer_device->device;
2219 if (device->state.conn == C_VERIFY_S ||
2220 device->state.conn == C_VERIFY_T) {
2230 static enum drbd_ret_code
2231 _check_net_options(struct drbd_connection *connection, struct net_conf *old_net_conf, struct net_conf *new_net_conf)
2233 struct drbd_peer_device *peer_device;
2236 if (old_net_conf && connection->cstate == C_WF_REPORT_PARAMS && connection->agreed_pro_version < 100) {
2237 if (new_net_conf->wire_protocol != old_net_conf->wire_protocol)
2238 return ERR_NEED_APV_100;
2240 if (new_net_conf->two_primaries != old_net_conf->two_primaries)
2241 return ERR_NEED_APV_100;
2243 if (strcmp(new_net_conf->integrity_alg, old_net_conf->integrity_alg))
2244 return ERR_NEED_APV_100;
2247 if (!new_net_conf->two_primaries &&
2248 conn_highest_role(connection) == R_PRIMARY &&
2249 conn_highest_peer(connection) == R_PRIMARY)
2250 return ERR_NEED_ALLOW_TWO_PRI;
2252 if (new_net_conf->two_primaries &&
2253 (new_net_conf->wire_protocol != DRBD_PROT_C))
2254 return ERR_NOT_PROTO_C;
2256 idr_for_each_entry(&connection->peer_devices, peer_device, i) {
2257 struct drbd_device *device = peer_device->device;
2258 if (get_ldev(device)) {
2259 enum drbd_fencing_p fp = rcu_dereference(device->ldev->disk_conf)->fencing;
2261 if (new_net_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
2262 return ERR_STONITH_AND_PROT_A;
2264 if (device->state.role == R_PRIMARY && new_net_conf->discard_my_data)
2265 return ERR_DISCARD_IMPOSSIBLE;
2268 if (new_net_conf->on_congestion != OC_BLOCK && new_net_conf->wire_protocol != DRBD_PROT_A)
2269 return ERR_CONG_NOT_PROTO_A;
2274 static enum drbd_ret_code
2275 check_net_options(struct drbd_connection *connection, struct net_conf *new_net_conf)
2277 enum drbd_ret_code rv;
2278 struct drbd_peer_device *peer_device;
2282 rv = _check_net_options(connection, rcu_dereference(connection->net_conf), new_net_conf);
2285 /* connection->peer_devices protected by genl_lock() here */
2286 idr_for_each_entry(&connection->peer_devices, peer_device, i) {
2287 struct drbd_device *device = peer_device->device;
2288 if (!device->bitmap) {
2289 if (drbd_bm_init(device))
2298 struct crypto_shash *verify_tfm;
2299 struct crypto_shash *csums_tfm;
2300 struct crypto_shash *cram_hmac_tfm;
2301 struct crypto_shash *integrity_tfm;
2305 alloc_shash(struct crypto_shash **tfm, char *tfm_name, int err_alg)
2310 *tfm = crypto_alloc_shash(tfm_name, 0, 0);
2319 static enum drbd_ret_code
2320 alloc_crypto(struct crypto *crypto, struct net_conf *new_net_conf)
2322 char hmac_name[CRYPTO_MAX_ALG_NAME];
2323 enum drbd_ret_code rv;
2325 rv = alloc_shash(&crypto->csums_tfm, new_net_conf->csums_alg,
2329 rv = alloc_shash(&crypto->verify_tfm, new_net_conf->verify_alg,
2333 rv = alloc_shash(&crypto->integrity_tfm, new_net_conf->integrity_alg,
2337 if (new_net_conf->cram_hmac_alg[0] != 0) {
2338 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
2339 new_net_conf->cram_hmac_alg);
2341 rv = alloc_shash(&crypto->cram_hmac_tfm, hmac_name,
2348 static void free_crypto(struct crypto *crypto)
2350 crypto_free_shash(crypto->cram_hmac_tfm);
2351 crypto_free_shash(crypto->integrity_tfm);
2352 crypto_free_shash(crypto->csums_tfm);
2353 crypto_free_shash(crypto->verify_tfm);
2356 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
2358 struct drbd_config_context adm_ctx;
2359 enum drbd_ret_code retcode;
2360 struct drbd_connection *connection;
2361 struct net_conf *old_net_conf, *new_net_conf = NULL;
2363 int ovr; /* online verify running */
2364 int rsr; /* re-sync running */
2365 struct crypto crypto = { };
2367 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_CONNECTION);
2368 if (!adm_ctx.reply_skb)
2370 if (retcode != NO_ERROR)
2373 connection = adm_ctx.connection;
2374 mutex_lock(&adm_ctx.resource->adm_mutex);
2376 new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
2377 if (!new_net_conf) {
2378 retcode = ERR_NOMEM;
2382 conn_reconfig_start(connection);
2384 mutex_lock(&connection->data.mutex);
2385 mutex_lock(&connection->resource->conf_update);
2386 old_net_conf = connection->net_conf;
2388 if (!old_net_conf) {
2389 drbd_msg_put_info(adm_ctx.reply_skb, "net conf missing, try connect");
2390 retcode = ERR_INVALID_REQUEST;
2394 *new_net_conf = *old_net_conf;
2395 if (should_set_defaults(info))
2396 set_net_conf_defaults(new_net_conf);
2398 err = net_conf_from_attrs_for_change(new_net_conf, info);
2399 if (err && err != -ENOMSG) {
2400 retcode = ERR_MANDATORY_TAG;
2401 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2405 retcode = check_net_options(connection, new_net_conf);
2406 if (retcode != NO_ERROR)
2409 /* re-sync running */
2410 rsr = conn_resync_running(connection);
2411 if (rsr && strcmp(new_net_conf->csums_alg, old_net_conf->csums_alg)) {
2412 retcode = ERR_CSUMS_RESYNC_RUNNING;
2416 /* online verify running */
2417 ovr = conn_ov_running(connection);
2418 if (ovr && strcmp(new_net_conf->verify_alg, old_net_conf->verify_alg)) {
2419 retcode = ERR_VERIFY_RUNNING;
2423 retcode = alloc_crypto(&crypto, new_net_conf);
2424 if (retcode != NO_ERROR)
2427 rcu_assign_pointer(connection->net_conf, new_net_conf);
2430 crypto_free_shash(connection->csums_tfm);
2431 connection->csums_tfm = crypto.csums_tfm;
2432 crypto.csums_tfm = NULL;
2435 crypto_free_shash(connection->verify_tfm);
2436 connection->verify_tfm = crypto.verify_tfm;
2437 crypto.verify_tfm = NULL;
2440 crypto_free_shash(connection->integrity_tfm);
2441 connection->integrity_tfm = crypto.integrity_tfm;
2442 if (connection->cstate >= C_WF_REPORT_PARAMS && connection->agreed_pro_version >= 100)
2443 /* Do this without trying to take connection->data.mutex again. */
2444 __drbd_send_protocol(connection, P_PROTOCOL_UPDATE);
2446 crypto_free_shash(connection->cram_hmac_tfm);
2447 connection->cram_hmac_tfm = crypto.cram_hmac_tfm;
2449 mutex_unlock(&connection->resource->conf_update);
2450 mutex_unlock(&connection->data.mutex);
2451 kvfree_rcu_mightsleep(old_net_conf);
2453 if (connection->cstate >= C_WF_REPORT_PARAMS) {
2454 struct drbd_peer_device *peer_device;
2457 idr_for_each_entry(&connection->peer_devices, peer_device, vnr)
2458 drbd_send_sync_param(peer_device);
2464 mutex_unlock(&connection->resource->conf_update);
2465 mutex_unlock(&connection->data.mutex);
2466 free_crypto(&crypto);
2467 kfree(new_net_conf);
2469 conn_reconfig_done(connection);
2471 mutex_unlock(&adm_ctx.resource->adm_mutex);
2473 drbd_adm_finish(&adm_ctx, info, retcode);
2477 static void connection_to_info(struct connection_info *info,
2478 struct drbd_connection *connection)
2480 info->conn_connection_state = connection->cstate;
2481 info->conn_role = conn_highest_peer(connection);
2484 static void peer_device_to_info(struct peer_device_info *info,
2485 struct drbd_peer_device *peer_device)
2487 struct drbd_device *device = peer_device->device;
2489 info->peer_repl_state =
2490 max_t(enum drbd_conns, C_WF_REPORT_PARAMS, device->state.conn);
2491 info->peer_disk_state = device->state.pdsk;
2492 info->peer_resync_susp_user = device->state.user_isp;
2493 info->peer_resync_susp_peer = device->state.peer_isp;
2494 info->peer_resync_susp_dependency = device->state.aftr_isp;
2497 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
2499 struct connection_info connection_info;
2500 enum drbd_notification_type flags;
2501 unsigned int peer_devices = 0;
2502 struct drbd_config_context adm_ctx;
2503 struct drbd_peer_device *peer_device;
2504 struct net_conf *old_net_conf, *new_net_conf = NULL;
2505 struct crypto crypto = { };
2506 struct drbd_resource *resource;
2507 struct drbd_connection *connection;
2508 enum drbd_ret_code retcode;
2509 enum drbd_state_rv rv;
2513 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
2515 if (!adm_ctx.reply_skb)
2517 if (retcode != NO_ERROR)
2519 if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
2520 drbd_msg_put_info(adm_ctx.reply_skb, "connection endpoint(s) missing");
2521 retcode = ERR_INVALID_REQUEST;
2525 /* No need for _rcu here. All reconfiguration is
2526 * strictly serialized on genl_lock(). We are protected against
2527 * concurrent reconfiguration/addition/deletion */
2528 for_each_resource(resource, &drbd_resources) {
2529 for_each_connection(connection, resource) {
2530 if (nla_len(adm_ctx.my_addr) == connection->my_addr_len &&
2531 !memcmp(nla_data(adm_ctx.my_addr), &connection->my_addr,
2532 connection->my_addr_len)) {
2533 retcode = ERR_LOCAL_ADDR;
2537 if (nla_len(adm_ctx.peer_addr) == connection->peer_addr_len &&
2538 !memcmp(nla_data(adm_ctx.peer_addr), &connection->peer_addr,
2539 connection->peer_addr_len)) {
2540 retcode = ERR_PEER_ADDR;
2546 mutex_lock(&adm_ctx.resource->adm_mutex);
2547 connection = first_connection(adm_ctx.resource);
2548 conn_reconfig_start(connection);
2550 if (connection->cstate > C_STANDALONE) {
2551 retcode = ERR_NET_CONFIGURED;
2555 /* allocation not in the IO path, drbdsetup / netlink process context */
2556 new_net_conf = kzalloc(sizeof(*new_net_conf), GFP_KERNEL);
2557 if (!new_net_conf) {
2558 retcode = ERR_NOMEM;
2562 set_net_conf_defaults(new_net_conf);
2564 err = net_conf_from_attrs(new_net_conf, info);
2565 if (err && err != -ENOMSG) {
2566 retcode = ERR_MANDATORY_TAG;
2567 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2571 retcode = check_net_options(connection, new_net_conf);
2572 if (retcode != NO_ERROR)
2575 retcode = alloc_crypto(&crypto, new_net_conf);
2576 if (retcode != NO_ERROR)
2579 ((char *)new_net_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2581 drbd_flush_workqueue(&connection->sender_work);
2583 mutex_lock(&adm_ctx.resource->conf_update);
2584 old_net_conf = connection->net_conf;
2586 retcode = ERR_NET_CONFIGURED;
2587 mutex_unlock(&adm_ctx.resource->conf_update);
2590 rcu_assign_pointer(connection->net_conf, new_net_conf);
2592 conn_free_crypto(connection);
2593 connection->cram_hmac_tfm = crypto.cram_hmac_tfm;
2594 connection->integrity_tfm = crypto.integrity_tfm;
2595 connection->csums_tfm = crypto.csums_tfm;
2596 connection->verify_tfm = crypto.verify_tfm;
2598 connection->my_addr_len = nla_len(adm_ctx.my_addr);
2599 memcpy(&connection->my_addr, nla_data(adm_ctx.my_addr), connection->my_addr_len);
2600 connection->peer_addr_len = nla_len(adm_ctx.peer_addr);
2601 memcpy(&connection->peer_addr, nla_data(adm_ctx.peer_addr), connection->peer_addr_len);
2603 idr_for_each_entry(&connection->peer_devices, peer_device, i) {
2607 connection_to_info(&connection_info, connection);
2608 flags = (peer_devices--) ? NOTIFY_CONTINUES : 0;
2609 mutex_lock(¬ification_mutex);
2610 notify_connection_state(NULL, 0, connection, &connection_info, NOTIFY_CREATE | flags);
2611 idr_for_each_entry(&connection->peer_devices, peer_device, i) {
2612 struct peer_device_info peer_device_info;
2614 peer_device_to_info(&peer_device_info, peer_device);
2615 flags = (peer_devices--) ? NOTIFY_CONTINUES : 0;
2616 notify_peer_device_state(NULL, 0, peer_device, &peer_device_info, NOTIFY_CREATE | flags);
2618 mutex_unlock(¬ification_mutex);
2619 mutex_unlock(&adm_ctx.resource->conf_update);
2622 idr_for_each_entry(&connection->peer_devices, peer_device, i) {
2623 struct drbd_device *device = peer_device->device;
2624 device->send_cnt = 0;
2625 device->recv_cnt = 0;
2629 rv = conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2631 conn_reconfig_done(connection);
2632 mutex_unlock(&adm_ctx.resource->adm_mutex);
2633 drbd_adm_finish(&adm_ctx, info, rv);
2637 free_crypto(&crypto);
2638 kfree(new_net_conf);
2640 conn_reconfig_done(connection);
2641 mutex_unlock(&adm_ctx.resource->adm_mutex);
2643 drbd_adm_finish(&adm_ctx, info, retcode);
2647 static enum drbd_state_rv conn_try_disconnect(struct drbd_connection *connection, bool force)
2649 enum drbd_conns cstate;
2650 enum drbd_state_rv rv;
2653 rv = conn_request_state(connection, NS(conn, C_DISCONNECTING),
2654 force ? CS_HARD : 0);
2657 case SS_NOTHING_TO_DO:
2659 case SS_ALREADY_STANDALONE:
2661 case SS_PRIMARY_NOP:
2662 /* Our state checking code wants to see the peer outdated. */
2663 rv = conn_request_state(connection, NS2(conn, C_DISCONNECTING, pdsk, D_OUTDATED), 0);
2665 if (rv == SS_OUTDATE_WO_CONN) /* lost connection before graceful disconnect succeeded */
2666 rv = conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_VERBOSE);
2669 case SS_CW_FAILED_BY_PEER:
2670 spin_lock_irq(&connection->resource->req_lock);
2671 cstate = connection->cstate;
2672 spin_unlock_irq(&connection->resource->req_lock);
2673 if (cstate <= C_WF_CONNECTION)
2675 /* The peer probably wants to see us outdated. */
2676 rv = conn_request_state(connection, NS2(conn, C_DISCONNECTING,
2677 disk, D_OUTDATED), 0);
2678 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2679 rv = conn_request_state(connection, NS(conn, C_DISCONNECTING),
2684 /* no special handling necessary */
2687 if (rv >= SS_SUCCESS) {
2688 enum drbd_state_rv rv2;
2689 /* No one else can reconfigure the network while I am here.
2690 * The state handling only uses drbd_thread_stop_nowait(),
2691 * we want to really wait here until the receiver is no more.
2693 drbd_thread_stop(&connection->receiver);
2695 /* Race breaker. This additional state change request may be
2696 * necessary, if this was a forced disconnect during a receiver
2697 * restart. We may have "killed" the receiver thread just
2698 * after drbd_receiver() returned. Typically, we should be
2699 * C_STANDALONE already, now, and this becomes a no-op.
2701 rv2 = conn_request_state(connection, NS(conn, C_STANDALONE),
2702 CS_VERBOSE | CS_HARD);
2703 if (rv2 < SS_SUCCESS)
2704 drbd_err(connection,
2705 "unexpected rv2=%d in conn_try_disconnect()\n",
2707 /* Unlike in DRBD 9, the state engine has generated
2708 * NOTIFY_DESTROY events before clearing connection->net_conf. */
2713 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2715 struct drbd_config_context adm_ctx;
2716 struct disconnect_parms parms;
2717 struct drbd_connection *connection;
2718 enum drbd_state_rv rv;
2719 enum drbd_ret_code retcode;
2722 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_CONNECTION);
2723 if (!adm_ctx.reply_skb)
2725 if (retcode != NO_ERROR)
2728 connection = adm_ctx.connection;
2729 memset(&parms, 0, sizeof(parms));
2730 if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2731 err = disconnect_parms_from_attrs(&parms, info);
2733 retcode = ERR_MANDATORY_TAG;
2734 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2739 mutex_lock(&adm_ctx.resource->adm_mutex);
2740 rv = conn_try_disconnect(connection, parms.force_disconnect);
2741 mutex_unlock(&adm_ctx.resource->adm_mutex);
2742 if (rv < SS_SUCCESS) {
2743 drbd_adm_finish(&adm_ctx, info, rv);
2748 drbd_adm_finish(&adm_ctx, info, retcode);
2752 void resync_after_online_grow(struct drbd_device *device)
2754 int iass; /* I am sync source */
2756 drbd_info(device, "Resync of new storage after online grow\n");
2757 if (device->state.role != device->state.peer)
2758 iass = (device->state.role == R_PRIMARY);
2760 iass = test_bit(RESOLVE_CONFLICTS, &first_peer_device(device)->connection->flags);
2763 drbd_start_resync(device, C_SYNC_SOURCE);
2765 _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2768 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2770 struct drbd_config_context adm_ctx;
2771 struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
2772 struct resize_parms rs;
2773 struct drbd_device *device;
2774 enum drbd_ret_code retcode;
2775 enum determine_dev_size dd;
2776 bool change_al_layout = false;
2777 enum dds_flags ddsf;
2781 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2782 if (!adm_ctx.reply_skb)
2784 if (retcode != NO_ERROR)
2787 mutex_lock(&adm_ctx.resource->adm_mutex);
2788 device = adm_ctx.device;
2789 if (!get_ldev(device)) {
2790 retcode = ERR_NO_DISK;
2794 memset(&rs, 0, sizeof(struct resize_parms));
2795 rs.al_stripes = device->ldev->md.al_stripes;
2796 rs.al_stripe_size = device->ldev->md.al_stripe_size_4k * 4;
2797 if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2798 err = resize_parms_from_attrs(&rs, info);
2800 retcode = ERR_MANDATORY_TAG;
2801 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2806 if (device->state.conn > C_CONNECTED) {
2807 retcode = ERR_RESIZE_RESYNC;
2811 if (device->state.role == R_SECONDARY &&
2812 device->state.peer == R_SECONDARY) {
2813 retcode = ERR_NO_PRIMARY;
2817 if (rs.no_resync && first_peer_device(device)->connection->agreed_pro_version < 93) {
2818 retcode = ERR_NEED_APV_93;
2823 u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
2825 if (u_size != (sector_t)rs.resize_size) {
2826 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2827 if (!new_disk_conf) {
2828 retcode = ERR_NOMEM;
2833 if (device->ldev->md.al_stripes != rs.al_stripes ||
2834 device->ldev->md.al_stripe_size_4k != rs.al_stripe_size / 4) {
2835 u32 al_size_k = rs.al_stripes * rs.al_stripe_size;
2837 if (al_size_k > (16 * 1024 * 1024)) {
2838 retcode = ERR_MD_LAYOUT_TOO_BIG;
2842 if (al_size_k < MD_32kB_SECT/2) {
2843 retcode = ERR_MD_LAYOUT_TOO_SMALL;
2847 if (device->state.conn != C_CONNECTED && !rs.resize_force) {
2848 retcode = ERR_MD_LAYOUT_CONNECTED;
2852 change_al_layout = true;
2855 if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev))
2856 device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev);
2858 if (new_disk_conf) {
2859 mutex_lock(&device->resource->conf_update);
2860 old_disk_conf = device->ldev->disk_conf;
2861 *new_disk_conf = *old_disk_conf;
2862 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2863 rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
2864 mutex_unlock(&device->resource->conf_update);
2865 kvfree_rcu_mightsleep(old_disk_conf);
2866 new_disk_conf = NULL;
2869 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2870 dd = drbd_determine_dev_size(device, ddsf, change_al_layout ? &rs : NULL);
2871 drbd_md_sync(device);
2873 if (dd == DS_ERROR) {
2874 retcode = ERR_NOMEM_BITMAP;
2876 } else if (dd == DS_ERROR_SPACE_MD) {
2877 retcode = ERR_MD_LAYOUT_NO_FIT;
2879 } else if (dd == DS_ERROR_SHRINK) {
2880 retcode = ERR_IMPLICIT_SHRINK;
2884 if (device->state.conn == C_CONNECTED) {
2886 set_bit(RESIZE_PENDING, &device->flags);
2888 drbd_send_uuids(first_peer_device(device));
2889 drbd_send_sizes(first_peer_device(device), 1, ddsf);
2893 mutex_unlock(&adm_ctx.resource->adm_mutex);
2895 drbd_adm_finish(&adm_ctx, info, retcode);
2900 kfree(new_disk_conf);
2904 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2906 struct drbd_config_context adm_ctx;
2907 enum drbd_ret_code retcode;
2908 struct res_opts res_opts;
2911 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
2912 if (!adm_ctx.reply_skb)
2914 if (retcode != NO_ERROR)
2917 res_opts = adm_ctx.resource->res_opts;
2918 if (should_set_defaults(info))
2919 set_res_opts_defaults(&res_opts);
2921 err = res_opts_from_attrs(&res_opts, info);
2922 if (err && err != -ENOMSG) {
2923 retcode = ERR_MANDATORY_TAG;
2924 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
2928 mutex_lock(&adm_ctx.resource->adm_mutex);
2929 err = set_resource_options(adm_ctx.resource, &res_opts);
2931 retcode = ERR_INVALID_REQUEST;
2933 retcode = ERR_NOMEM;
2935 mutex_unlock(&adm_ctx.resource->adm_mutex);
2938 drbd_adm_finish(&adm_ctx, info, retcode);
2942 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2944 struct drbd_config_context adm_ctx;
2945 struct drbd_device *device;
2946 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2948 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2949 if (!adm_ctx.reply_skb)
2951 if (retcode != NO_ERROR)
2954 device = adm_ctx.device;
2955 if (!get_ldev(device)) {
2956 retcode = ERR_NO_DISK;
2960 mutex_lock(&adm_ctx.resource->adm_mutex);
2962 /* If there is still bitmap IO pending, probably because of a previous
2963 * resync just being finished, wait for it before requesting a new resync.
2964 * Also wait for it's after_state_ch(). */
2965 drbd_suspend_io(device);
2966 wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
2967 drbd_flush_workqueue(&first_peer_device(device)->connection->sender_work);
2969 /* If we happen to be C_STANDALONE R_SECONDARY, just change to
2970 * D_INCONSISTENT, and set all bits in the bitmap. Otherwise,
2971 * try to start a resync handshake as sync target for full sync.
2973 if (device->state.conn == C_STANDALONE && device->state.role == R_SECONDARY) {
2974 retcode = drbd_request_state(device, NS(disk, D_INCONSISTENT));
2975 if (retcode >= SS_SUCCESS) {
2976 if (drbd_bitmap_io(device, &drbd_bmio_set_n_write,
2977 "set_n_write from invalidate", BM_LOCKED_MASK, NULL))
2978 retcode = ERR_IO_MD_DISK;
2981 retcode = drbd_request_state(device, NS(conn, C_STARTING_SYNC_T));
2982 drbd_resume_io(device);
2983 mutex_unlock(&adm_ctx.resource->adm_mutex);
2986 drbd_adm_finish(&adm_ctx, info, retcode);
2990 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2991 union drbd_state mask, union drbd_state val)
2993 struct drbd_config_context adm_ctx;
2994 enum drbd_ret_code retcode;
2996 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
2997 if (!adm_ctx.reply_skb)
2999 if (retcode != NO_ERROR)
3002 mutex_lock(&adm_ctx.resource->adm_mutex);
3003 retcode = drbd_request_state(adm_ctx.device, mask, val);
3004 mutex_unlock(&adm_ctx.resource->adm_mutex);
3006 drbd_adm_finish(&adm_ctx, info, retcode);
3010 static int drbd_bmio_set_susp_al(struct drbd_device *device,
3011 struct drbd_peer_device *peer_device) __must_hold(local)
3015 rv = drbd_bmio_set_n_write(device, peer_device);
3016 drbd_suspend_al(device);
3020 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
3022 struct drbd_config_context adm_ctx;
3023 int retcode; /* drbd_ret_code, drbd_state_rv */
3024 struct drbd_device *device;
3026 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3027 if (!adm_ctx.reply_skb)
3029 if (retcode != NO_ERROR)
3032 device = adm_ctx.device;
3033 if (!get_ldev(device)) {
3034 retcode = ERR_NO_DISK;
3038 mutex_lock(&adm_ctx.resource->adm_mutex);
3040 /* If there is still bitmap IO pending, probably because of a previous
3041 * resync just being finished, wait for it before requesting a new resync.
3042 * Also wait for it's after_state_ch(). */
3043 drbd_suspend_io(device);
3044 wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
3045 drbd_flush_workqueue(&first_peer_device(device)->connection->sender_work);
3047 /* If we happen to be C_STANDALONE R_PRIMARY, just set all bits
3048 * in the bitmap. Otherwise, try to start a resync handshake
3049 * as sync source for full sync.
3051 if (device->state.conn == C_STANDALONE && device->state.role == R_PRIMARY) {
3052 /* The peer will get a resync upon connect anyways. Just make that
3053 into a full resync. */
3054 retcode = drbd_request_state(device, NS(pdsk, D_INCONSISTENT));
3055 if (retcode >= SS_SUCCESS) {
3056 if (drbd_bitmap_io(device, &drbd_bmio_set_susp_al,
3057 "set_n_write from invalidate_peer",
3058 BM_LOCKED_SET_ALLOWED, NULL))
3059 retcode = ERR_IO_MD_DISK;
3062 retcode = drbd_request_state(device, NS(conn, C_STARTING_SYNC_S));
3063 drbd_resume_io(device);
3064 mutex_unlock(&adm_ctx.resource->adm_mutex);
3067 drbd_adm_finish(&adm_ctx, info, retcode);
3071 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
3073 struct drbd_config_context adm_ctx;
3074 enum drbd_ret_code retcode;
3076 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3077 if (!adm_ctx.reply_skb)
3079 if (retcode != NO_ERROR)
3082 mutex_lock(&adm_ctx.resource->adm_mutex);
3083 if (drbd_request_state(adm_ctx.device, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
3084 retcode = ERR_PAUSE_IS_SET;
3085 mutex_unlock(&adm_ctx.resource->adm_mutex);
3087 drbd_adm_finish(&adm_ctx, info, retcode);
3091 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
3093 struct drbd_config_context adm_ctx;
3094 union drbd_dev_state s;
3095 enum drbd_ret_code retcode;
3097 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3098 if (!adm_ctx.reply_skb)
3100 if (retcode != NO_ERROR)
3103 mutex_lock(&adm_ctx.resource->adm_mutex);
3104 if (drbd_request_state(adm_ctx.device, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
3105 s = adm_ctx.device->state;
3106 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
3107 retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
3108 s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
3110 retcode = ERR_PAUSE_IS_CLEAR;
3113 mutex_unlock(&adm_ctx.resource->adm_mutex);
3115 drbd_adm_finish(&adm_ctx, info, retcode);
3119 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
3121 return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
3124 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
3126 struct drbd_config_context adm_ctx;
3127 struct drbd_device *device;
3128 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
3130 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3131 if (!adm_ctx.reply_skb)
3133 if (retcode != NO_ERROR)
3136 mutex_lock(&adm_ctx.resource->adm_mutex);
3137 device = adm_ctx.device;
3138 if (test_bit(NEW_CUR_UUID, &device->flags)) {
3139 if (get_ldev_if_state(device, D_ATTACHING)) {
3140 drbd_uuid_new_current(device);
3143 /* This is effectively a multi-stage "forced down".
3144 * The NEW_CUR_UUID bit is supposedly only set, if we
3145 * lost the replication connection, and are configured
3146 * to freeze IO and wait for some fence-peer handler.
3147 * So we still don't have a replication connection.
3148 * And now we don't have a local disk either. After
3149 * resume, we will fail all pending and new IO, because
3150 * we don't have any data anymore. Which means we will
3151 * eventually be able to terminate all users of this
3152 * device, and then take it down. By bumping the
3153 * "effective" data uuid, we make sure that you really
3154 * need to tear down before you reconfigure, we will
3155 * the refuse to re-connect or re-attach (because no
3156 * matching real data uuid exists).
3159 get_random_bytes(&val, sizeof(u64));
3160 drbd_set_ed_uuid(device, val);
3161 drbd_warn(device, "Resumed without access to data; please tear down before attempting to re-configure.\n");
3163 clear_bit(NEW_CUR_UUID, &device->flags);
3165 drbd_suspend_io(device);
3166 retcode = drbd_request_state(device, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
3167 if (retcode == SS_SUCCESS) {
3168 if (device->state.conn < C_CONNECTED)
3169 tl_clear(first_peer_device(device)->connection);
3170 if (device->state.disk == D_DISKLESS || device->state.disk == D_FAILED)
3171 tl_restart(first_peer_device(device)->connection, FAIL_FROZEN_DISK_IO);
3173 drbd_resume_io(device);
3174 mutex_unlock(&adm_ctx.resource->adm_mutex);
3176 drbd_adm_finish(&adm_ctx, info, retcode);
3180 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
3182 return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
3185 static int nla_put_drbd_cfg_context(struct sk_buff *skb,
3186 struct drbd_resource *resource,
3187 struct drbd_connection *connection,
3188 struct drbd_device *device)
3191 nla = nla_nest_start_noflag(skb, DRBD_NLA_CFG_CONTEXT);
3193 goto nla_put_failure;
3195 nla_put_u32(skb, T_ctx_volume, device->vnr))
3196 goto nla_put_failure;
3197 if (nla_put_string(skb, T_ctx_resource_name, resource->name))
3198 goto nla_put_failure;
3200 if (connection->my_addr_len &&
3201 nla_put(skb, T_ctx_my_addr, connection->my_addr_len, &connection->my_addr))
3202 goto nla_put_failure;
3203 if (connection->peer_addr_len &&
3204 nla_put(skb, T_ctx_peer_addr, connection->peer_addr_len, &connection->peer_addr))
3205 goto nla_put_failure;
3207 nla_nest_end(skb, nla);
3212 nla_nest_cancel(skb, nla);
3217 * The generic netlink dump callbacks are called outside the genl_lock(), so
3218 * they cannot use the simple attribute parsing code which uses global
3221 static struct nlattr *find_cfg_context_attr(const struct nlmsghdr *nlh, int attr)
3223 const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
3224 const int maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
3227 nla = nla_find(nlmsg_attrdata(nlh, hdrlen), nlmsg_attrlen(nlh, hdrlen),
3228 DRBD_NLA_CFG_CONTEXT);
3231 return drbd_nla_find_nested(maxtype, nla, __nla_type(attr));
3234 static void resource_to_info(struct resource_info *, struct drbd_resource *);
3236 int drbd_adm_dump_resources(struct sk_buff *skb, struct netlink_callback *cb)
3238 struct drbd_genlmsghdr *dh;
3239 struct drbd_resource *resource;
3240 struct resource_info resource_info;
3241 struct resource_statistics resource_statistics;
3246 for_each_resource_rcu(resource, &drbd_resources)
3247 if (resource == (struct drbd_resource *)cb->args[0])
3248 goto found_resource;
3249 err = 0; /* resource was probably deleted */
3252 resource = list_entry(&drbd_resources,
3253 struct drbd_resource, resources);
3256 list_for_each_entry_continue_rcu(resource, &drbd_resources, resources) {
3263 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
3264 cb->nlh->nlmsg_seq, &drbd_genl_family,
3265 NLM_F_MULTI, DRBD_ADM_GET_RESOURCES);
3270 dh->ret_code = NO_ERROR;
3271 err = nla_put_drbd_cfg_context(skb, resource, NULL, NULL);
3274 err = res_opts_to_skb(skb, &resource->res_opts, !capable(CAP_SYS_ADMIN));
3277 resource_to_info(&resource_info, resource);
3278 err = resource_info_to_skb(skb, &resource_info, !capable(CAP_SYS_ADMIN));
3281 resource_statistics.res_stat_write_ordering = resource->write_ordering;
3282 err = resource_statistics_to_skb(skb, &resource_statistics, !capable(CAP_SYS_ADMIN));
3285 cb->args[0] = (long)resource;
3286 genlmsg_end(skb, dh);
3296 static void device_to_statistics(struct device_statistics *s,
3297 struct drbd_device *device)
3299 memset(s, 0, sizeof(*s));
3300 s->dev_upper_blocked = !may_inc_ap_bio(device);
3301 if (get_ldev(device)) {
3302 struct drbd_md *md = &device->ldev->md;
3303 u64 *history_uuids = (u64 *)s->history_uuids;
3306 spin_lock_irq(&md->uuid_lock);
3307 s->dev_current_uuid = md->uuid[UI_CURRENT];
3308 BUILD_BUG_ON(sizeof(s->history_uuids) < UI_HISTORY_END - UI_HISTORY_START + 1);
3309 for (n = 0; n < UI_HISTORY_END - UI_HISTORY_START + 1; n++)
3310 history_uuids[n] = md->uuid[UI_HISTORY_START + n];
3311 for (; n < HISTORY_UUIDS; n++)
3312 history_uuids[n] = 0;
3313 s->history_uuids_len = HISTORY_UUIDS;
3314 spin_unlock_irq(&md->uuid_lock);
3316 s->dev_disk_flags = md->flags;
3319 s->dev_size = get_capacity(device->vdisk);
3320 s->dev_read = device->read_cnt;
3321 s->dev_write = device->writ_cnt;
3322 s->dev_al_writes = device->al_writ_cnt;
3323 s->dev_bm_writes = device->bm_writ_cnt;
3324 s->dev_upper_pending = atomic_read(&device->ap_bio_cnt);
3325 s->dev_lower_pending = atomic_read(&device->local_cnt);
3326 s->dev_al_suspended = test_bit(AL_SUSPENDED, &device->flags);
3327 s->dev_exposed_data_uuid = device->ed_uuid;
3330 static int put_resource_in_arg0(struct netlink_callback *cb, int holder_nr)
3333 struct drbd_resource *resource =
3334 (struct drbd_resource *)cb->args[0];
3335 kref_put(&resource->kref, drbd_destroy_resource);
3341 int drbd_adm_dump_devices_done(struct netlink_callback *cb) {
3342 return put_resource_in_arg0(cb, 7);
3345 static void device_to_info(struct device_info *, struct drbd_device *);
3347 int drbd_adm_dump_devices(struct sk_buff *skb, struct netlink_callback *cb)
3349 struct nlattr *resource_filter;
3350 struct drbd_resource *resource;
3351 struct drbd_device *device;
3352 int minor, err, retcode;
3353 struct drbd_genlmsghdr *dh;
3354 struct device_info device_info;
3355 struct device_statistics device_statistics;
3356 struct idr *idr_to_search;
3358 resource = (struct drbd_resource *)cb->args[0];
3359 if (!cb->args[0] && !cb->args[1]) {
3360 resource_filter = find_cfg_context_attr(cb->nlh, T_ctx_resource_name);
3361 if (resource_filter) {
3362 retcode = ERR_RES_NOT_KNOWN;
3363 resource = drbd_find_resource(nla_data(resource_filter));
3366 cb->args[0] = (long)resource;
3371 minor = cb->args[1];
3372 idr_to_search = resource ? &resource->devices : &drbd_devices;
3373 device = idr_get_next(idr_to_search, &minor);
3378 idr_for_each_entry_continue(idr_to_search, device, minor) {
3380 goto put_result; /* only one iteration */
3383 goto out; /* no more devices */
3386 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
3387 cb->nlh->nlmsg_seq, &drbd_genl_family,
3388 NLM_F_MULTI, DRBD_ADM_GET_DEVICES);
3392 dh->ret_code = retcode;
3394 if (retcode == NO_ERROR) {
3395 dh->minor = device->minor;
3396 err = nla_put_drbd_cfg_context(skb, device->resource, NULL, device);
3399 if (get_ldev(device)) {
3400 struct disk_conf *disk_conf =
3401 rcu_dereference(device->ldev->disk_conf);
3403 err = disk_conf_to_skb(skb, disk_conf, !capable(CAP_SYS_ADMIN));
3408 device_to_info(&device_info, device);
3409 err = device_info_to_skb(skb, &device_info, !capable(CAP_SYS_ADMIN));
3413 device_to_statistics(&device_statistics, device);
3414 err = device_statistics_to_skb(skb, &device_statistics, !capable(CAP_SYS_ADMIN));
3417 cb->args[1] = minor + 1;
3419 genlmsg_end(skb, dh);
3429 int drbd_adm_dump_connections_done(struct netlink_callback *cb)
3431 return put_resource_in_arg0(cb, 6);
3434 enum { SINGLE_RESOURCE, ITERATE_RESOURCES };
3436 int drbd_adm_dump_connections(struct sk_buff *skb, struct netlink_callback *cb)
3438 struct nlattr *resource_filter;
3439 struct drbd_resource *resource = NULL, *next_resource;
3440 struct drbd_connection *connection;
3441 int err = 0, retcode;
3442 struct drbd_genlmsghdr *dh;
3443 struct connection_info connection_info;
3444 struct connection_statistics connection_statistics;
3447 resource = (struct drbd_resource *)cb->args[0];
3449 resource_filter = find_cfg_context_attr(cb->nlh, T_ctx_resource_name);
3450 if (resource_filter) {
3451 retcode = ERR_RES_NOT_KNOWN;
3452 resource = drbd_find_resource(nla_data(resource_filter));
3455 cb->args[0] = (long)resource;
3456 cb->args[1] = SINGLE_RESOURCE;
3460 if (list_empty(&drbd_resources))
3462 resource = list_first_entry(&drbd_resources, struct drbd_resource, resources);
3463 kref_get(&resource->kref);
3464 cb->args[0] = (long)resource;
3465 cb->args[1] = ITERATE_RESOURCES;
3470 mutex_lock(&resource->conf_update);
3473 for_each_connection_rcu(connection, resource)
3474 if (connection == (struct drbd_connection *)cb->args[2])
3475 goto found_connection;
3476 /* connection was probably deleted */
3477 goto no_more_connections;
3479 connection = list_entry(&resource->connections, struct drbd_connection, connections);
3482 list_for_each_entry_continue_rcu(connection, &resource->connections, connections) {
3483 if (!has_net_conf(connection))
3486 goto put_result; /* only one iteration */
3489 no_more_connections:
3490 if (cb->args[1] == ITERATE_RESOURCES) {
3491 for_each_resource_rcu(next_resource, &drbd_resources) {
3492 if (next_resource == resource)
3493 goto found_resource;
3495 /* resource was probably deleted */
3500 list_for_each_entry_continue_rcu(next_resource, &drbd_resources, resources) {
3501 mutex_unlock(&resource->conf_update);
3502 kref_put(&resource->kref, drbd_destroy_resource);
3503 resource = next_resource;
3504 kref_get(&resource->kref);
3505 cb->args[0] = (long)resource;
3509 goto out; /* no more resources */
3512 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
3513 cb->nlh->nlmsg_seq, &drbd_genl_family,
3514 NLM_F_MULTI, DRBD_ADM_GET_CONNECTIONS);
3518 dh->ret_code = retcode;
3520 if (retcode == NO_ERROR) {
3521 struct net_conf *net_conf;
3523 err = nla_put_drbd_cfg_context(skb, resource, connection, NULL);
3526 net_conf = rcu_dereference(connection->net_conf);
3528 err = net_conf_to_skb(skb, net_conf, !capable(CAP_SYS_ADMIN));
3532 connection_to_info(&connection_info, connection);
3533 err = connection_info_to_skb(skb, &connection_info, !capable(CAP_SYS_ADMIN));
3536 connection_statistics.conn_congested = test_bit(NET_CONGESTED, &connection->flags);
3537 err = connection_statistics_to_skb(skb, &connection_statistics, !capable(CAP_SYS_ADMIN));
3540 cb->args[2] = (long)connection;
3542 genlmsg_end(skb, dh);
3548 mutex_unlock(&resource->conf_update);
3554 enum mdf_peer_flag {
3555 MDF_PEER_CONNECTED = 1 << 0,
3556 MDF_PEER_OUTDATED = 1 << 1,
3557 MDF_PEER_FENCING = 1 << 2,
3558 MDF_PEER_FULL_SYNC = 1 << 3,
3561 static void peer_device_to_statistics(struct peer_device_statistics *s,
3562 struct drbd_peer_device *peer_device)
3564 struct drbd_device *device = peer_device->device;
3566 memset(s, 0, sizeof(*s));
3567 s->peer_dev_received = device->recv_cnt;
3568 s->peer_dev_sent = device->send_cnt;
3569 s->peer_dev_pending = atomic_read(&device->ap_pending_cnt) +
3570 atomic_read(&device->rs_pending_cnt);
3571 s->peer_dev_unacked = atomic_read(&device->unacked_cnt);
3572 s->peer_dev_out_of_sync = drbd_bm_total_weight(device) << (BM_BLOCK_SHIFT - 9);
3573 s->peer_dev_resync_failed = device->rs_failed << (BM_BLOCK_SHIFT - 9);
3574 if (get_ldev(device)) {
3575 struct drbd_md *md = &device->ldev->md;
3577 spin_lock_irq(&md->uuid_lock);
3578 s->peer_dev_bitmap_uuid = md->uuid[UI_BITMAP];
3579 spin_unlock_irq(&md->uuid_lock);
3581 (drbd_md_test_flag(device->ldev, MDF_CONNECTED_IND) ?
3582 MDF_PEER_CONNECTED : 0) +
3583 (drbd_md_test_flag(device->ldev, MDF_CONSISTENT) &&
3584 !drbd_md_test_flag(device->ldev, MDF_WAS_UP_TO_DATE) ?
3585 MDF_PEER_OUTDATED : 0) +
3586 /* FIXME: MDF_PEER_FENCING? */
3587 (drbd_md_test_flag(device->ldev, MDF_FULL_SYNC) ?
3588 MDF_PEER_FULL_SYNC : 0);
3593 int drbd_adm_dump_peer_devices_done(struct netlink_callback *cb)
3595 return put_resource_in_arg0(cb, 9);
3598 int drbd_adm_dump_peer_devices(struct sk_buff *skb, struct netlink_callback *cb)
3600 struct nlattr *resource_filter;
3601 struct drbd_resource *resource;
3602 struct drbd_device *device;
3603 struct drbd_peer_device *peer_device = NULL;
3604 int minor, err, retcode;
3605 struct drbd_genlmsghdr *dh;
3606 struct idr *idr_to_search;
3608 resource = (struct drbd_resource *)cb->args[0];
3609 if (!cb->args[0] && !cb->args[1]) {
3610 resource_filter = find_cfg_context_attr(cb->nlh, T_ctx_resource_name);
3611 if (resource_filter) {
3612 retcode = ERR_RES_NOT_KNOWN;
3613 resource = drbd_find_resource(nla_data(resource_filter));
3617 cb->args[0] = (long)resource;
3621 minor = cb->args[1];
3622 idr_to_search = resource ? &resource->devices : &drbd_devices;
3623 device = idr_find(idr_to_search, minor);
3628 device = idr_get_next(idr_to_search, &minor);
3635 for_each_peer_device(peer_device, device)
3636 if (peer_device == (struct drbd_peer_device *)cb->args[2])
3637 goto found_peer_device;
3638 /* peer device was probably deleted */
3641 /* Make peer_device point to the list head (not the first entry). */
3642 peer_device = list_entry(&device->peer_devices, struct drbd_peer_device, peer_devices);
3645 list_for_each_entry_continue_rcu(peer_device, &device->peer_devices, peer_devices) {
3646 if (!has_net_conf(peer_device->connection))
3649 goto put_result; /* only one iteration */
3654 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
3655 cb->nlh->nlmsg_seq, &drbd_genl_family,
3656 NLM_F_MULTI, DRBD_ADM_GET_PEER_DEVICES);
3660 dh->ret_code = retcode;
3662 if (retcode == NO_ERROR) {
3663 struct peer_device_info peer_device_info;
3664 struct peer_device_statistics peer_device_statistics;
3667 err = nla_put_drbd_cfg_context(skb, device->resource, peer_device->connection, device);
3670 peer_device_to_info(&peer_device_info, peer_device);
3671 err = peer_device_info_to_skb(skb, &peer_device_info, !capable(CAP_SYS_ADMIN));
3674 peer_device_to_statistics(&peer_device_statistics, peer_device);
3675 err = peer_device_statistics_to_skb(skb, &peer_device_statistics, !capable(CAP_SYS_ADMIN));
3678 cb->args[1] = minor;
3679 cb->args[2] = (long)peer_device;
3681 genlmsg_end(skb, dh);
3691 * Return the connection of @resource if @resource has exactly one connection.
3693 static struct drbd_connection *the_only_connection(struct drbd_resource *resource)
3695 struct list_head *connections = &resource->connections;
3697 if (list_empty(connections) || connections->next->next != connections)
3699 return list_first_entry(&resource->connections, struct drbd_connection, connections);
3702 static int nla_put_status_info(struct sk_buff *skb, struct drbd_device *device,
3703 const struct sib_info *sib)
3705 struct drbd_resource *resource = device->resource;
3706 struct state_info *si = NULL; /* for sizeof(si->member); */
3710 int exclude_sensitive;
3712 /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
3713 * to. So we better exclude_sensitive information.
3715 * If sib == NULL, this is drbd_adm_get_status, executed synchronously
3716 * in the context of the requesting user process. Exclude sensitive
3717 * information, unless current has superuser.
3719 * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
3720 * relies on the current implementation of netlink_dump(), which
3721 * executes the dump callback successively from netlink_recvmsg(),
3722 * always in the context of the receiving process */
3723 exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
3725 got_ldev = get_ldev(device);
3727 /* We need to add connection name and volume number information still.
3728 * Minor number is in drbd_genlmsghdr. */
3729 if (nla_put_drbd_cfg_context(skb, resource, the_only_connection(resource), device))
3730 goto nla_put_failure;
3732 if (res_opts_to_skb(skb, &device->resource->res_opts, exclude_sensitive))
3733 goto nla_put_failure;
3737 struct disk_conf *disk_conf;
3739 disk_conf = rcu_dereference(device->ldev->disk_conf);
3740 err = disk_conf_to_skb(skb, disk_conf, exclude_sensitive);
3743 struct net_conf *nc;
3745 nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
3747 err = net_conf_to_skb(skb, nc, exclude_sensitive);
3751 goto nla_put_failure;
3753 nla = nla_nest_start_noflag(skb, DRBD_NLA_STATE_INFO);
3755 goto nla_put_failure;
3756 if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
3757 nla_put_u32(skb, T_current_state, device->state.i) ||
3758 nla_put_u64_0pad(skb, T_ed_uuid, device->ed_uuid) ||
3759 nla_put_u64_0pad(skb, T_capacity, get_capacity(device->vdisk)) ||
3760 nla_put_u64_0pad(skb, T_send_cnt, device->send_cnt) ||
3761 nla_put_u64_0pad(skb, T_recv_cnt, device->recv_cnt) ||
3762 nla_put_u64_0pad(skb, T_read_cnt, device->read_cnt) ||
3763 nla_put_u64_0pad(skb, T_writ_cnt, device->writ_cnt) ||
3764 nla_put_u64_0pad(skb, T_al_writ_cnt, device->al_writ_cnt) ||
3765 nla_put_u64_0pad(skb, T_bm_writ_cnt, device->bm_writ_cnt) ||
3766 nla_put_u32(skb, T_ap_bio_cnt, atomic_read(&device->ap_bio_cnt)) ||
3767 nla_put_u32(skb, T_ap_pending_cnt, atomic_read(&device->ap_pending_cnt)) ||
3768 nla_put_u32(skb, T_rs_pending_cnt, atomic_read(&device->rs_pending_cnt)))
3769 goto nla_put_failure;
3774 spin_lock_irq(&device->ldev->md.uuid_lock);
3775 err = nla_put(skb, T_uuids, sizeof(si->uuids), device->ldev->md.uuid);
3776 spin_unlock_irq(&device->ldev->md.uuid_lock);
3779 goto nla_put_failure;
3781 if (nla_put_u32(skb, T_disk_flags, device->ldev->md.flags) ||
3782 nla_put_u64_0pad(skb, T_bits_total, drbd_bm_bits(device)) ||
3783 nla_put_u64_0pad(skb, T_bits_oos,
3784 drbd_bm_total_weight(device)))
3785 goto nla_put_failure;
3786 if (C_SYNC_SOURCE <= device->state.conn &&
3787 C_PAUSED_SYNC_T >= device->state.conn) {
3788 if (nla_put_u64_0pad(skb, T_bits_rs_total,
3789 device->rs_total) ||
3790 nla_put_u64_0pad(skb, T_bits_rs_failed,
3792 goto nla_put_failure;
3797 switch(sib->sib_reason) {
3798 case SIB_SYNC_PROGRESS:
3799 case SIB_GET_STATUS_REPLY:
3801 case SIB_STATE_CHANGE:
3802 if (nla_put_u32(skb, T_prev_state, sib->os.i) ||
3803 nla_put_u32(skb, T_new_state, sib->ns.i))
3804 goto nla_put_failure;
3806 case SIB_HELPER_POST:
3807 if (nla_put_u32(skb, T_helper_exit_code,
3808 sib->helper_exit_code))
3809 goto nla_put_failure;
3811 case SIB_HELPER_PRE:
3812 if (nla_put_string(skb, T_helper, sib->helper_name))
3813 goto nla_put_failure;
3817 nla_nest_end(skb, nla);
3827 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
3829 struct drbd_config_context adm_ctx;
3830 enum drbd_ret_code retcode;
3833 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
3834 if (!adm_ctx.reply_skb)
3836 if (retcode != NO_ERROR)
3839 err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.device, NULL);
3841 nlmsg_free(adm_ctx.reply_skb);
3845 drbd_adm_finish(&adm_ctx, info, retcode);
3849 static int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
3851 struct drbd_device *device;
3852 struct drbd_genlmsghdr *dh;
3853 struct drbd_resource *pos = (struct drbd_resource *)cb->args[0];
3854 struct drbd_resource *resource = NULL;
3855 struct drbd_resource *tmp;
3856 unsigned volume = cb->args[1];
3858 /* Open coded, deferred, iteration:
3859 * for_each_resource_safe(resource, tmp, &drbd_resources) {
3860 * connection = "first connection of resource or undefined";
3861 * idr_for_each_entry(&resource->devices, device, i) {
3865 * where resource is cb->args[0];
3866 * and i is cb->args[1];
3868 * cb->args[2] indicates if we shall loop over all resources,
3869 * or just dump all volumes of a single resource.
3871 * This may miss entries inserted after this dump started,
3872 * or entries deleted before they are reached.
3874 * We need to make sure the device won't disappear while
3875 * we are looking at it, and revalidate our iterators
3876 * on each iteration.
3879 /* synchronize with conn_create()/drbd_destroy_connection() */
3881 /* revalidate iterator position */
3882 for_each_resource_rcu(tmp, &drbd_resources) {
3884 /* first iteration */
3896 device = idr_get_next(&resource->devices, &volume);
3898 /* No more volumes to dump on this resource.
3899 * Advance resource iterator. */
3900 pos = list_entry_rcu(resource->resources.next,
3901 struct drbd_resource, resources);
3902 /* Did we dump any volume of this resource yet? */
3904 /* If we reached the end of the list,
3905 * or only a single resource dump was requested,
3907 if (&pos->resources == &drbd_resources || cb->args[2])
3915 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
3916 cb->nlh->nlmsg_seq, &drbd_genl_family,
3917 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
3922 /* This is a connection without a single volume.
3923 * Suprisingly enough, it may have a network
3925 struct drbd_connection *connection;
3928 dh->ret_code = NO_ERROR;
3929 connection = the_only_connection(resource);
3930 if (nla_put_drbd_cfg_context(skb, resource, connection, NULL))
3933 struct net_conf *nc;
3935 nc = rcu_dereference(connection->net_conf);
3936 if (nc && net_conf_to_skb(skb, nc, 1) != 0)
3942 D_ASSERT(device, device->vnr == volume);
3943 D_ASSERT(device, device->resource == resource);
3945 dh->minor = device_to_minor(device);
3946 dh->ret_code = NO_ERROR;
3948 if (nla_put_status_info(skb, device, NULL)) {
3950 genlmsg_cancel(skb, dh);
3954 genlmsg_end(skb, dh);
3959 /* where to start the next iteration */
3960 cb->args[0] = (long)pos;
3961 cb->args[1] = (pos == resource) ? volume + 1 : 0;
3963 /* No more resources/volumes/minors found results in an empty skb.
3964 * Which will terminate the dump. */
3969 * Request status of all resources, or of all volumes within a single resource.
3971 * This is a dump, as the answer may not fit in a single reply skb otherwise.
3972 * Which means we cannot use the family->attrbuf or other such members, because
3973 * dump is NOT protected by the genl_lock(). During dump, we only have access
3974 * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
3976 * Once things are setup properly, we call into get_one_status().
3978 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
3980 const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
3982 const char *resource_name;
3983 struct drbd_resource *resource;
3986 /* Is this a followup call? */
3988 /* ... of a single resource dump,
3989 * and the resource iterator has been advanced already? */
3990 if (cb->args[2] && cb->args[2] != cb->args[0])
3991 return 0; /* DONE. */
3995 /* First call (from netlink_dump_start). We need to figure out
3996 * which resource(s) the user wants us to dump. */
3997 nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
3998 nlmsg_attrlen(cb->nlh, hdrlen),
3999 DRBD_NLA_CFG_CONTEXT);
4001 /* No explicit context given. Dump all. */
4004 maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
4005 nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
4007 return PTR_ERR(nla);
4008 /* context given, but no name present? */
4011 resource_name = nla_data(nla);
4012 if (!*resource_name)
4014 resource = drbd_find_resource(resource_name);
4018 kref_put(&resource->kref, drbd_destroy_resource); /* get_one_status() revalidates the resource */
4020 /* prime iterators, and set "filter" mode mark:
4021 * only dump this connection. */
4022 cb->args[0] = (long)resource;
4023 /* cb->args[1] = 0; passed in this way. */
4024 cb->args[2] = (long)resource;
4027 return get_one_status(skb, cb);
4030 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
4032 struct drbd_config_context adm_ctx;
4033 enum drbd_ret_code retcode;
4034 struct timeout_parms tp;
4037 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
4038 if (!adm_ctx.reply_skb)
4040 if (retcode != NO_ERROR)
4044 adm_ctx.device->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
4045 test_bit(USE_DEGR_WFC_T, &adm_ctx.device->flags) ? UT_DEGRADED :
4048 err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
4050 nlmsg_free(adm_ctx.reply_skb);
4054 drbd_adm_finish(&adm_ctx, info, retcode);
4058 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
4060 struct drbd_config_context adm_ctx;
4061 struct drbd_device *device;
4062 enum drbd_ret_code retcode;
4063 struct start_ov_parms parms;
4065 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
4066 if (!adm_ctx.reply_skb)
4068 if (retcode != NO_ERROR)
4071 device = adm_ctx.device;
4073 /* resume from last known position, if possible */
4074 parms.ov_start_sector = device->ov_start_sector;
4075 parms.ov_stop_sector = ULLONG_MAX;
4076 if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
4077 int err = start_ov_parms_from_attrs(&parms, info);
4079 retcode = ERR_MANDATORY_TAG;
4080 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
4084 mutex_lock(&adm_ctx.resource->adm_mutex);
4086 /* w_make_ov_request expects position to be aligned */
4087 device->ov_start_sector = parms.ov_start_sector & ~(BM_SECT_PER_BIT-1);
4088 device->ov_stop_sector = parms.ov_stop_sector;
4090 /* If there is still bitmap IO pending, e.g. previous resync or verify
4091 * just being finished, wait for it before requesting a new resync. */
4092 drbd_suspend_io(device);
4093 wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
4094 retcode = drbd_request_state(device, NS(conn, C_VERIFY_S));
4095 drbd_resume_io(device);
4097 mutex_unlock(&adm_ctx.resource->adm_mutex);
4099 drbd_adm_finish(&adm_ctx, info, retcode);
4104 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
4106 struct drbd_config_context adm_ctx;
4107 struct drbd_device *device;
4108 enum drbd_ret_code retcode;
4109 int skip_initial_sync = 0;
4111 struct new_c_uuid_parms args;
4113 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
4114 if (!adm_ctx.reply_skb)
4116 if (retcode != NO_ERROR)
4119 device = adm_ctx.device;
4120 memset(&args, 0, sizeof(args));
4121 if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
4122 err = new_c_uuid_parms_from_attrs(&args, info);
4124 retcode = ERR_MANDATORY_TAG;
4125 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
4130 mutex_lock(&adm_ctx.resource->adm_mutex);
4131 mutex_lock(device->state_mutex); /* Protects us against serialized state changes. */
4133 if (!get_ldev(device)) {
4134 retcode = ERR_NO_DISK;
4138 /* this is "skip initial sync", assume to be clean */
4139 if (device->state.conn == C_CONNECTED &&
4140 first_peer_device(device)->connection->agreed_pro_version >= 90 &&
4141 device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
4142 drbd_info(device, "Preparing to skip initial sync\n");
4143 skip_initial_sync = 1;
4144 } else if (device->state.conn != C_STANDALONE) {
4145 retcode = ERR_CONNECTED;
4149 drbd_uuid_set(device, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
4150 drbd_uuid_new_current(device); /* New current, previous to UI_BITMAP */
4152 if (args.clear_bm) {
4153 err = drbd_bitmap_io(device, &drbd_bmio_clear_n_write,
4154 "clear_n_write from new_c_uuid", BM_LOCKED_MASK, NULL);
4156 drbd_err(device, "Writing bitmap failed with %d\n", err);
4157 retcode = ERR_IO_MD_DISK;
4159 if (skip_initial_sync) {
4160 drbd_send_uuids_skip_initial_sync(first_peer_device(device));
4161 _drbd_uuid_set(device, UI_BITMAP, 0);
4162 drbd_print_uuids(device, "cleared bitmap UUID");
4163 spin_lock_irq(&device->resource->req_lock);
4164 _drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
4166 spin_unlock_irq(&device->resource->req_lock);
4170 drbd_md_sync(device);
4174 mutex_unlock(device->state_mutex);
4175 mutex_unlock(&adm_ctx.resource->adm_mutex);
4177 drbd_adm_finish(&adm_ctx, info, retcode);
4181 static enum drbd_ret_code
4182 drbd_check_resource_name(struct drbd_config_context *adm_ctx)
4184 const char *name = adm_ctx->resource_name;
4185 if (!name || !name[0]) {
4186 drbd_msg_put_info(adm_ctx->reply_skb, "resource name missing");
4187 return ERR_MANDATORY_TAG;
4189 /* if we want to use these in sysfs/configfs/debugfs some day,
4190 * we must not allow slashes */
4191 if (strchr(name, '/')) {
4192 drbd_msg_put_info(adm_ctx->reply_skb, "invalid resource name");
4193 return ERR_INVALID_REQUEST;
4198 static void resource_to_info(struct resource_info *info,
4199 struct drbd_resource *resource)
4201 info->res_role = conn_highest_role(first_connection(resource));
4202 info->res_susp = resource->susp;
4203 info->res_susp_nod = resource->susp_nod;
4204 info->res_susp_fen = resource->susp_fen;
4207 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
4209 struct drbd_connection *connection;
4210 struct drbd_config_context adm_ctx;
4211 enum drbd_ret_code retcode;
4212 struct res_opts res_opts;
4215 retcode = drbd_adm_prepare(&adm_ctx, skb, info, 0);
4216 if (!adm_ctx.reply_skb)
4218 if (retcode != NO_ERROR)
4221 set_res_opts_defaults(&res_opts);
4222 err = res_opts_from_attrs(&res_opts, info);
4223 if (err && err != -ENOMSG) {
4224 retcode = ERR_MANDATORY_TAG;
4225 drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
4229 retcode = drbd_check_resource_name(&adm_ctx);
4230 if (retcode != NO_ERROR)
4233 if (adm_ctx.resource) {
4234 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
4235 retcode = ERR_INVALID_REQUEST;
4236 drbd_msg_put_info(adm_ctx.reply_skb, "resource exists");
4238 /* else: still NO_ERROR */
4242 /* not yet safe for genl_family.parallel_ops */
4243 mutex_lock(&resources_mutex);
4244 connection = conn_create(adm_ctx.resource_name, &res_opts);
4245 mutex_unlock(&resources_mutex);
4248 struct resource_info resource_info;
4250 mutex_lock(¬ification_mutex);
4251 resource_to_info(&resource_info, connection->resource);
4252 notify_resource_state(NULL, 0, connection->resource,
4253 &resource_info, NOTIFY_CREATE);
4254 mutex_unlock(¬ification_mutex);
4256 retcode = ERR_NOMEM;
4259 drbd_adm_finish(&adm_ctx, info, retcode);
4263 static void device_to_info(struct device_info *info,
4264 struct drbd_device *device)
4266 info->dev_disk_state = device->state.disk;
4270 int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info)
4272 struct drbd_config_context adm_ctx;
4273 struct drbd_genlmsghdr *dh = info->userhdr;
4274 enum drbd_ret_code retcode;
4276 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
4277 if (!adm_ctx.reply_skb)
4279 if (retcode != NO_ERROR)
4282 if (dh->minor > MINORMASK) {
4283 drbd_msg_put_info(adm_ctx.reply_skb, "requested minor out of range");
4284 retcode = ERR_INVALID_REQUEST;
4287 if (adm_ctx.volume > DRBD_VOLUME_MAX) {
4288 drbd_msg_put_info(adm_ctx.reply_skb, "requested volume id out of range");
4289 retcode = ERR_INVALID_REQUEST;
4293 /* drbd_adm_prepare made sure already
4294 * that first_peer_device(device)->connection and device->vnr match the request. */
4295 if (adm_ctx.device) {
4296 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
4297 retcode = ERR_MINOR_OR_VOLUME_EXISTS;
4298 /* else: still NO_ERROR */
4302 mutex_lock(&adm_ctx.resource->adm_mutex);
4303 retcode = drbd_create_device(&adm_ctx, dh->minor);
4304 if (retcode == NO_ERROR) {
4305 struct drbd_device *device;
4306 struct drbd_peer_device *peer_device;
4307 struct device_info info;
4308 unsigned int peer_devices = 0;
4309 enum drbd_notification_type flags;
4311 device = minor_to_device(dh->minor);
4312 for_each_peer_device(peer_device, device) {
4313 if (!has_net_conf(peer_device->connection))
4318 device_to_info(&info, device);
4319 mutex_lock(¬ification_mutex);
4320 flags = (peer_devices--) ? NOTIFY_CONTINUES : 0;
4321 notify_device_state(NULL, 0, device, &info, NOTIFY_CREATE | flags);
4322 for_each_peer_device(peer_device, device) {
4323 struct peer_device_info peer_device_info;
4325 if (!has_net_conf(peer_device->connection))
4327 peer_device_to_info(&peer_device_info, peer_device);
4328 flags = (peer_devices--) ? NOTIFY_CONTINUES : 0;
4329 notify_peer_device_state(NULL, 0, peer_device, &peer_device_info,
4330 NOTIFY_CREATE | flags);
4332 mutex_unlock(¬ification_mutex);
4334 mutex_unlock(&adm_ctx.resource->adm_mutex);
4336 drbd_adm_finish(&adm_ctx, info, retcode);
4340 static enum drbd_ret_code adm_del_minor(struct drbd_device *device)
4342 struct drbd_peer_device *peer_device;
4344 if (device->state.disk == D_DISKLESS &&
4345 /* no need to be device->state.conn == C_STANDALONE &&
4346 * we may want to delete a minor from a live replication group.
4348 device->state.role == R_SECONDARY) {
4349 struct drbd_connection *connection =
4350 first_connection(device->resource);
4352 _drbd_request_state(device, NS(conn, C_WF_REPORT_PARAMS),
4353 CS_VERBOSE + CS_WAIT_COMPLETE);
4355 /* If the state engine hasn't stopped the sender thread yet, we
4356 * need to flush the sender work queue before generating the
4357 * DESTROY events here. */
4358 if (get_t_state(&connection->worker) == RUNNING)
4359 drbd_flush_workqueue(&connection->sender_work);
4361 mutex_lock(¬ification_mutex);
4362 for_each_peer_device(peer_device, device) {
4363 if (!has_net_conf(peer_device->connection))
4365 notify_peer_device_state(NULL, 0, peer_device, NULL,
4366 NOTIFY_DESTROY | NOTIFY_CONTINUES);
4368 notify_device_state(NULL, 0, device, NULL, NOTIFY_DESTROY);
4369 mutex_unlock(¬ification_mutex);
4371 drbd_delete_device(device);
4374 return ERR_MINOR_CONFIGURED;
4377 int drbd_adm_del_minor(struct sk_buff *skb, struct genl_info *info)
4379 struct drbd_config_context adm_ctx;
4380 enum drbd_ret_code retcode;
4382 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
4383 if (!adm_ctx.reply_skb)
4385 if (retcode != NO_ERROR)
4388 mutex_lock(&adm_ctx.resource->adm_mutex);
4389 retcode = adm_del_minor(adm_ctx.device);
4390 mutex_unlock(&adm_ctx.resource->adm_mutex);
4392 drbd_adm_finish(&adm_ctx, info, retcode);
4396 static int adm_del_resource(struct drbd_resource *resource)
4398 struct drbd_connection *connection;
4400 for_each_connection(connection, resource) {
4401 if (connection->cstate > C_STANDALONE)
4402 return ERR_NET_CONFIGURED;
4404 if (!idr_is_empty(&resource->devices))
4405 return ERR_RES_IN_USE;
4407 /* The state engine has stopped the sender thread, so we don't
4408 * need to flush the sender work queue before generating the
4409 * DESTROY event here. */
4410 mutex_lock(¬ification_mutex);
4411 notify_resource_state(NULL, 0, resource, NULL, NOTIFY_DESTROY);
4412 mutex_unlock(¬ification_mutex);
4414 mutex_lock(&resources_mutex);
4415 list_del_rcu(&resource->resources);
4416 mutex_unlock(&resources_mutex);
4417 /* Make sure all threads have actually stopped: state handling only
4418 * does drbd_thread_stop_nowait(). */
4419 list_for_each_entry(connection, &resource->connections, connections)
4420 drbd_thread_stop(&connection->worker);
4422 drbd_free_resource(resource);
4426 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
4428 struct drbd_config_context adm_ctx;
4429 struct drbd_resource *resource;
4430 struct drbd_connection *connection;
4431 struct drbd_device *device;
4432 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
4435 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
4436 if (!adm_ctx.reply_skb)
4438 if (retcode != NO_ERROR)
4441 resource = adm_ctx.resource;
4442 mutex_lock(&resource->adm_mutex);
4444 for_each_connection(connection, resource) {
4445 struct drbd_peer_device *peer_device;
4447 idr_for_each_entry(&connection->peer_devices, peer_device, i) {
4448 retcode = drbd_set_role(peer_device->device, R_SECONDARY, 0);
4449 if (retcode < SS_SUCCESS) {
4450 drbd_msg_put_info(adm_ctx.reply_skb, "failed to demote");
4455 retcode = conn_try_disconnect(connection, 0);
4456 if (retcode < SS_SUCCESS) {
4457 drbd_msg_put_info(adm_ctx.reply_skb, "failed to disconnect");
4463 idr_for_each_entry(&resource->devices, device, i) {
4464 retcode = adm_detach(device, 0);
4465 if (retcode < SS_SUCCESS || retcode > NO_ERROR) {
4466 drbd_msg_put_info(adm_ctx.reply_skb, "failed to detach");
4471 /* delete volumes */
4472 idr_for_each_entry(&resource->devices, device, i) {
4473 retcode = adm_del_minor(device);
4474 if (retcode != NO_ERROR) {
4475 /* "can not happen" */
4476 drbd_msg_put_info(adm_ctx.reply_skb, "failed to delete volume");
4481 retcode = adm_del_resource(resource);
4483 mutex_unlock(&resource->adm_mutex);
4485 drbd_adm_finish(&adm_ctx, info, retcode);
4489 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
4491 struct drbd_config_context adm_ctx;
4492 struct drbd_resource *resource;
4493 enum drbd_ret_code retcode;
4495 retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
4496 if (!adm_ctx.reply_skb)
4498 if (retcode != NO_ERROR)
4500 resource = adm_ctx.resource;
4502 mutex_lock(&resource->adm_mutex);
4503 retcode = adm_del_resource(resource);
4504 mutex_unlock(&resource->adm_mutex);
4506 drbd_adm_finish(&adm_ctx, info, retcode);
4510 void drbd_bcast_event(struct drbd_device *device, const struct sib_info *sib)
4512 struct sk_buff *msg;
4513 struct drbd_genlmsghdr *d_out;
4517 seq = atomic_inc_return(&drbd_genl_seq);
4518 msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
4523 d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
4524 if (!d_out) /* cannot happen, but anyways. */
4525 goto nla_put_failure;
4526 d_out->minor = device_to_minor(device);
4527 d_out->ret_code = NO_ERROR;
4529 if (nla_put_status_info(msg, device, sib))
4530 goto nla_put_failure;
4531 genlmsg_end(msg, d_out);
4532 err = drbd_genl_multicast_events(msg, GFP_NOWAIT);
4533 /* msg has been consumed or freed in netlink_broadcast() */
4534 if (err && err != -ESRCH)
4542 drbd_err(device, "Error %d while broadcasting event. "
4543 "Event seq:%u sib_reason:%u\n",
4544 err, seq, sib->sib_reason);
4547 static int nla_put_notification_header(struct sk_buff *msg,
4548 enum drbd_notification_type type)
4550 struct drbd_notification_header nh = {
4554 return drbd_notification_header_to_skb(msg, &nh, true);
4557 int notify_resource_state(struct sk_buff *skb,
4559 struct drbd_resource *resource,
4560 struct resource_info *resource_info,
4561 enum drbd_notification_type type)
4563 struct resource_statistics resource_statistics;
4564 struct drbd_genlmsghdr *dh;
4565 bool multicast = false;
4569 seq = atomic_inc_return(¬ify_genl_seq);
4570 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
4578 dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_RESOURCE_STATE);
4580 goto nla_put_failure;
4582 dh->ret_code = NO_ERROR;
4583 if (nla_put_drbd_cfg_context(skb, resource, NULL, NULL) ||
4584 nla_put_notification_header(skb, type) ||
4585 ((type & ~NOTIFY_FLAGS) != NOTIFY_DESTROY &&
4586 resource_info_to_skb(skb, resource_info, true)))
4587 goto nla_put_failure;
4588 resource_statistics.res_stat_write_ordering = resource->write_ordering;
4589 err = resource_statistics_to_skb(skb, &resource_statistics, !capable(CAP_SYS_ADMIN));
4591 goto nla_put_failure;
4592 genlmsg_end(skb, dh);
4594 err = drbd_genl_multicast_events(skb, GFP_NOWAIT);
4595 /* skb has been consumed or freed in netlink_broadcast() */
4596 if (err && err != -ESRCH)
4604 drbd_err(resource, "Error %d while broadcasting event. Event seq:%u\n",
4609 int notify_device_state(struct sk_buff *skb,
4611 struct drbd_device *device,
4612 struct device_info *device_info,
4613 enum drbd_notification_type type)
4615 struct device_statistics device_statistics;
4616 struct drbd_genlmsghdr *dh;
4617 bool multicast = false;
4621 seq = atomic_inc_return(¬ify_genl_seq);
4622 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
4630 dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_DEVICE_STATE);
4632 goto nla_put_failure;
4633 dh->minor = device->minor;
4634 dh->ret_code = NO_ERROR;
4635 if (nla_put_drbd_cfg_context(skb, device->resource, NULL, device) ||
4636 nla_put_notification_header(skb, type) ||
4637 ((type & ~NOTIFY_FLAGS) != NOTIFY_DESTROY &&
4638 device_info_to_skb(skb, device_info, true)))
4639 goto nla_put_failure;
4640 device_to_statistics(&device_statistics, device);
4641 device_statistics_to_skb(skb, &device_statistics, !capable(CAP_SYS_ADMIN));
4642 genlmsg_end(skb, dh);
4644 err = drbd_genl_multicast_events(skb, GFP_NOWAIT);
4645 /* skb has been consumed or freed in netlink_broadcast() */
4646 if (err && err != -ESRCH)
4654 drbd_err(device, "Error %d while broadcasting event. Event seq:%u\n",
4659 int notify_connection_state(struct sk_buff *skb,
4661 struct drbd_connection *connection,
4662 struct connection_info *connection_info,
4663 enum drbd_notification_type type)
4665 struct connection_statistics connection_statistics;
4666 struct drbd_genlmsghdr *dh;
4667 bool multicast = false;
4671 seq = atomic_inc_return(¬ify_genl_seq);
4672 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
4680 dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_CONNECTION_STATE);
4682 goto nla_put_failure;
4684 dh->ret_code = NO_ERROR;
4685 if (nla_put_drbd_cfg_context(skb, connection->resource, connection, NULL) ||
4686 nla_put_notification_header(skb, type) ||
4687 ((type & ~NOTIFY_FLAGS) != NOTIFY_DESTROY &&
4688 connection_info_to_skb(skb, connection_info, true)))
4689 goto nla_put_failure;
4690 connection_statistics.conn_congested = test_bit(NET_CONGESTED, &connection->flags);
4691 connection_statistics_to_skb(skb, &connection_statistics, !capable(CAP_SYS_ADMIN));
4692 genlmsg_end(skb, dh);
4694 err = drbd_genl_multicast_events(skb, GFP_NOWAIT);
4695 /* skb has been consumed or freed in netlink_broadcast() */
4696 if (err && err != -ESRCH)
4704 drbd_err(connection, "Error %d while broadcasting event. Event seq:%u\n",
4709 int notify_peer_device_state(struct sk_buff *skb,
4711 struct drbd_peer_device *peer_device,
4712 struct peer_device_info *peer_device_info,
4713 enum drbd_notification_type type)
4715 struct peer_device_statistics peer_device_statistics;
4716 struct drbd_resource *resource = peer_device->device->resource;
4717 struct drbd_genlmsghdr *dh;
4718 bool multicast = false;
4722 seq = atomic_inc_return(¬ify_genl_seq);
4723 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
4731 dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_PEER_DEVICE_STATE);
4733 goto nla_put_failure;
4735 dh->ret_code = NO_ERROR;
4736 if (nla_put_drbd_cfg_context(skb, resource, peer_device->connection, peer_device->device) ||
4737 nla_put_notification_header(skb, type) ||
4738 ((type & ~NOTIFY_FLAGS) != NOTIFY_DESTROY &&
4739 peer_device_info_to_skb(skb, peer_device_info, true)))
4740 goto nla_put_failure;
4741 peer_device_to_statistics(&peer_device_statistics, peer_device);
4742 peer_device_statistics_to_skb(skb, &peer_device_statistics, !capable(CAP_SYS_ADMIN));
4743 genlmsg_end(skb, dh);
4745 err = drbd_genl_multicast_events(skb, GFP_NOWAIT);
4746 /* skb has been consumed or freed in netlink_broadcast() */
4747 if (err && err != -ESRCH)
4755 drbd_err(peer_device, "Error %d while broadcasting event. Event seq:%u\n",
4760 void notify_helper(enum drbd_notification_type type,
4761 struct drbd_device *device, struct drbd_connection *connection,
4762 const char *name, int status)
4764 struct drbd_resource *resource = device ? device->resource : connection->resource;
4765 struct drbd_helper_info helper_info;
4766 unsigned int seq = atomic_inc_return(¬ify_genl_seq);
4767 struct sk_buff *skb = NULL;
4768 struct drbd_genlmsghdr *dh;
4771 strscpy(helper_info.helper_name, name, sizeof(helper_info.helper_name));
4772 helper_info.helper_name_len = min(strlen(name), sizeof(helper_info.helper_name));
4773 helper_info.helper_status = status;
4775 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
4781 dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_HELPER);
4784 dh->minor = device ? device->minor : -1;
4785 dh->ret_code = NO_ERROR;
4786 mutex_lock(¬ification_mutex);
4787 if (nla_put_drbd_cfg_context(skb, resource, connection, device) ||
4788 nla_put_notification_header(skb, type) ||
4789 drbd_helper_info_to_skb(skb, &helper_info, true))
4791 genlmsg_end(skb, dh);
4792 err = drbd_genl_multicast_events(skb, GFP_NOWAIT);
4794 /* skb has been consumed or freed in netlink_broadcast() */
4795 if (err && err != -ESRCH)
4797 mutex_unlock(¬ification_mutex);
4801 mutex_unlock(¬ification_mutex);
4804 drbd_err(resource, "Error %d while broadcasting event. Event seq:%u\n",
4808 static int notify_initial_state_done(struct sk_buff *skb, unsigned int seq)
4810 struct drbd_genlmsghdr *dh;
4814 dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_INITIAL_STATE_DONE);
4816 goto nla_put_failure;
4818 dh->ret_code = NO_ERROR;
4819 if (nla_put_notification_header(skb, NOTIFY_EXISTS))
4820 goto nla_put_failure;
4821 genlmsg_end(skb, dh);
4826 pr_err("Error %d sending event. Event seq:%u\n", err, seq);
4830 static void free_state_changes(struct list_head *list)
4832 while (!list_empty(list)) {
4833 struct drbd_state_change *state_change =
4834 list_first_entry(list, struct drbd_state_change, list);
4835 list_del(&state_change->list);
4836 forget_state_change(state_change);
4840 static unsigned int notifications_for_state_change(struct drbd_state_change *state_change)
4843 state_change->n_connections +
4844 state_change->n_devices +
4845 state_change->n_devices * state_change->n_connections;
4848 static int get_initial_state(struct sk_buff *skb, struct netlink_callback *cb)
4850 struct drbd_state_change *state_change = (struct drbd_state_change *)cb->args[0];
4851 unsigned int seq = cb->args[2];
4853 enum drbd_notification_type flags = 0;
4856 /* There is no need for taking notification_mutex here: it doesn't
4857 matter if the initial state events mix with later state chage
4858 events; we can always tell the events apart by the NOTIFY_EXISTS
4862 if (cb->args[5] == 1) {
4863 err = notify_initial_state_done(skb, seq);
4867 if (cb->args[4] < cb->args[3])
4868 flags |= NOTIFY_CONTINUES;
4870 err = notify_resource_state_change(skb, seq, state_change->resource,
4871 NOTIFY_EXISTS | flags);
4875 if (n < state_change->n_connections) {
4876 err = notify_connection_state_change(skb, seq, &state_change->connections[n],
4877 NOTIFY_EXISTS | flags);
4880 n -= state_change->n_connections;
4881 if (n < state_change->n_devices) {
4882 err = notify_device_state_change(skb, seq, &state_change->devices[n],
4883 NOTIFY_EXISTS | flags);
4886 n -= state_change->n_devices;
4887 if (n < state_change->n_devices * state_change->n_connections) {
4888 err = notify_peer_device_state_change(skb, seq, &state_change->peer_devices[n],
4889 NOTIFY_EXISTS | flags);
4894 if (cb->args[4] == cb->args[3]) {
4895 struct drbd_state_change *next_state_change =
4896 list_entry(state_change->list.next,
4897 struct drbd_state_change, list);
4898 cb->args[0] = (long)next_state_change;
4899 cb->args[3] = notifications_for_state_change(next_state_change);
4909 int drbd_adm_get_initial_state(struct sk_buff *skb, struct netlink_callback *cb)
4911 struct drbd_resource *resource;
4914 if (cb->args[5] >= 1) {
4915 if (cb->args[5] > 1)
4916 return get_initial_state(skb, cb);
4918 struct drbd_state_change *state_change =
4919 (struct drbd_state_change *)cb->args[0];
4921 /* connect list to head */
4922 list_add(&head, &state_change->list);
4923 free_state_changes(&head);
4928 cb->args[5] = 2; /* number of iterations */
4929 mutex_lock(&resources_mutex);
4930 for_each_resource(resource, &drbd_resources) {
4931 struct drbd_state_change *state_change;
4933 state_change = remember_old_state(resource, GFP_KERNEL);
4934 if (!state_change) {
4935 if (!list_empty(&head))
4936 free_state_changes(&head);
4937 mutex_unlock(&resources_mutex);
4940 copy_old_to_new_state_change(state_change);
4941 list_add_tail(&state_change->list, &head);
4942 cb->args[5] += notifications_for_state_change(state_change);
4944 mutex_unlock(&resources_mutex);
4946 if (!list_empty(&head)) {
4947 struct drbd_state_change *state_change =
4948 list_entry(head.next, struct drbd_state_change, list);
4949 cb->args[0] = (long)state_change;
4950 cb->args[3] = notifications_for_state_change(state_change);
4951 list_del(&head); /* detach list from head */
4954 cb->args[2] = cb->nlh->nlmsg_seq;
4955 return get_initial_state(skb, cb);