4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
10 drbd is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
15 drbd is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with drbd; see the file COPYING. If not, write to
22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include <linux/module.h>
27 #include <linux/drbd.h>
30 #include <linux/file.h>
31 #include <linux/slab.h>
32 #include <linux/blkpg.h>
33 #include <linux/cpumask.h>
36 #include "drbd_wrappers.h"
37 #include <asm/unaligned.h>
38 #include <linux/drbd_limits.h>
39 #include <linux/kthread.h>
41 #include <net/genetlink.h>
44 // int drbd_adm_create_resource(struct sk_buff *skb, struct genl_info *info);
45 // int drbd_adm_delete_resource(struct sk_buff *skb, struct genl_info *info);
47 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info);
48 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info);
50 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info);
51 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info);
52 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info);
54 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info);
55 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info);
56 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info);
57 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info);
58 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info);
59 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info);
60 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info);
61 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info);
62 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info);
63 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info);
64 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info);
65 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info);
66 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info);
67 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info);
68 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info);
69 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info);
70 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info);
71 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info);
72 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info);
73 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info);
75 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb);
77 #include <linux/drbd_genl_api.h>
79 #include <linux/genl_magic_func.h>
81 /* used blkdev_get_by_path, to claim our meta data device(s) */
82 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
84 /* Configuration is strictly serialized, because generic netlink message
85 * processing is strictly serialized by the genl_lock().
86 * Which means we can use one static global drbd_config_context struct.
88 static struct drbd_config_context {
89 /* assigned from drbd_genlmsghdr */
91 /* assigned from request attributes, if present */
93 #define VOLUME_UNSPECIFIED (-1U)
94 /* pointer into the request skb,
95 * limited lifetime! */
97 struct nlattr *my_addr;
98 struct nlattr *peer_addr;
101 struct sk_buff *reply_skb;
102 /* pointer into reply buffer */
103 struct drbd_genlmsghdr *reply_dh;
104 /* resolved from attributes, if possible */
105 struct drbd_conf *mdev;
106 struct drbd_tconn *tconn;
109 static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
111 genlmsg_end(skb, genlmsg_data(nlmsg_data(nlmsg_hdr(skb))));
112 if (genlmsg_reply(skb, info))
113 printk(KERN_ERR "drbd: error sending genl reply\n");
116 /* Used on a fresh "drbd_adm_prepare"d reply_skb, this cannot fail: The only
117 * reason it could fail was no space in skb, and there are 4k available. */
118 int drbd_msg_put_info(const char *info)
120 struct sk_buff *skb = adm_ctx.reply_skb;
124 if (!info || !info[0])
127 nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
131 err = nla_put_string(skb, T_info_text, info);
133 nla_nest_cancel(skb, nla);
136 nla_nest_end(skb, nla);
140 /* This would be a good candidate for a "pre_doit" hook,
141 * and per-family private info->pointers.
142 * But we need to stay compatible with older kernels.
143 * If it returns successfully, adm_ctx members are valid.
145 #define DRBD_ADM_NEED_MINOR 1
146 #define DRBD_ADM_NEED_RESOURCE 2
147 #define DRBD_ADM_NEED_CONNECTION 4
148 static int drbd_adm_prepare(struct sk_buff *skb, struct genl_info *info,
151 struct drbd_genlmsghdr *d_in = info->userhdr;
152 const u8 cmd = info->genlhdr->cmd;
155 memset(&adm_ctx, 0, sizeof(adm_ctx));
157 /* genl_rcv_msg only checks for CAP_NET_ADMIN on "GENL_ADMIN_PERM" :( */
158 if (cmd != DRBD_ADM_GET_STATUS
159 && security_netlink_recv(skb, CAP_SYS_ADMIN))
162 adm_ctx.reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
163 if (!adm_ctx.reply_skb) {
168 adm_ctx.reply_dh = genlmsg_put_reply(adm_ctx.reply_skb,
169 info, &drbd_genl_family, 0, cmd);
170 /* put of a few bytes into a fresh skb of >= 4k will always succeed.
172 if (!adm_ctx.reply_dh) {
177 adm_ctx.reply_dh->minor = d_in->minor;
178 adm_ctx.reply_dh->ret_code = NO_ERROR;
180 adm_ctx.volume = VOLUME_UNSPECIFIED;
181 if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
183 /* parse and validate only */
184 err = drbd_cfg_context_from_attrs(NULL, info);
188 /* It was present, and valid,
189 * copy it over to the reply skb. */
190 err = nla_put_nohdr(adm_ctx.reply_skb,
191 info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
192 info->attrs[DRBD_NLA_CFG_CONTEXT]);
196 /* and assign stuff to the global adm_ctx */
197 nla = nested_attr_tb[__nla_type(T_ctx_volume)];
199 adm_ctx.volume = nla_get_u32(nla);
200 nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
202 adm_ctx.resource_name = nla_data(nla);
203 adm_ctx.my_addr = nested_attr_tb[__nla_type(T_ctx_my_addr)];
204 adm_ctx.peer_addr = nested_attr_tb[__nla_type(T_ctx_peer_addr)];
205 if ((adm_ctx.my_addr &&
206 nla_len(adm_ctx.my_addr) > sizeof(adm_ctx.tconn->my_addr)) ||
207 (adm_ctx.peer_addr &&
208 nla_len(adm_ctx.peer_addr) > sizeof(adm_ctx.tconn->peer_addr))) {
214 adm_ctx.minor = d_in->minor;
215 adm_ctx.mdev = minor_to_mdev(d_in->minor);
216 adm_ctx.tconn = conn_get_by_name(adm_ctx.resource_name);
218 if (!adm_ctx.mdev && (flags & DRBD_ADM_NEED_MINOR)) {
219 drbd_msg_put_info("unknown minor");
220 return ERR_MINOR_INVALID;
222 if (!adm_ctx.tconn && (flags & DRBD_ADM_NEED_RESOURCE)) {
223 drbd_msg_put_info("unknown resource");
224 return ERR_INVALID_REQUEST;
227 if (flags & DRBD_ADM_NEED_CONNECTION) {
228 if (adm_ctx.tconn && !(flags & DRBD_ADM_NEED_RESOURCE)) {
229 drbd_msg_put_info("no resource name expected");
230 return ERR_INVALID_REQUEST;
233 drbd_msg_put_info("no minor number expected");
234 return ERR_INVALID_REQUEST;
236 if (adm_ctx.my_addr && adm_ctx.peer_addr)
237 adm_ctx.tconn = conn_get_by_addrs(nla_data(adm_ctx.my_addr),
238 nla_len(adm_ctx.my_addr),
239 nla_data(adm_ctx.peer_addr),
240 nla_len(adm_ctx.peer_addr));
241 if (!adm_ctx.tconn) {
242 drbd_msg_put_info("unknown connection");
243 return ERR_INVALID_REQUEST;
247 /* some more paranoia, if the request was over-determined */
248 if (adm_ctx.mdev && adm_ctx.tconn &&
249 adm_ctx.mdev->tconn != adm_ctx.tconn) {
250 pr_warning("request: minor=%u, resource=%s; but that minor belongs to connection %s\n",
251 adm_ctx.minor, adm_ctx.resource_name,
252 adm_ctx.mdev->tconn->name);
253 drbd_msg_put_info("minor exists in different resource");
254 return ERR_INVALID_REQUEST;
257 adm_ctx.volume != VOLUME_UNSPECIFIED &&
258 adm_ctx.volume != adm_ctx.mdev->vnr) {
259 pr_warning("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
260 adm_ctx.minor, adm_ctx.volume,
261 adm_ctx.mdev->vnr, adm_ctx.mdev->tconn->name);
262 drbd_msg_put_info("minor exists as different volume");
263 return ERR_INVALID_REQUEST;
269 nlmsg_free(adm_ctx.reply_skb);
270 adm_ctx.reply_skb = NULL;
274 static int drbd_adm_finish(struct genl_info *info, int retcode)
277 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
278 adm_ctx.tconn = NULL;
281 if (!adm_ctx.reply_skb)
284 adm_ctx.reply_dh->ret_code = retcode;
285 drbd_adm_send_reply(adm_ctx.reply_skb, info);
289 static void setup_khelper_env(struct drbd_tconn *tconn, char **envp)
293 /* FIXME: A future version will not allow this case. */
294 if (tconn->my_addr_len == 0 || tconn->peer_addr_len == 0)
297 switch (((struct sockaddr *)&tconn->peer_addr)->sa_family) {
300 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
301 &((struct sockaddr_in6 *)&tconn->peer_addr)->sin6_addr);
305 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
306 &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
310 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
311 &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
313 snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
316 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
318 char *envp[] = { "HOME=/",
320 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
321 (char[20]) { }, /* address family */
322 (char[60]) { }, /* address */
325 char *argv[] = {usermode_helper, cmd, mb, NULL };
326 struct drbd_tconn *tconn = mdev->tconn;
330 if (current == tconn->worker.task)
331 set_bit(CALLBACK_PENDING, &tconn->flags);
333 snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
334 setup_khelper_env(tconn, envp);
336 /* The helper may take some time.
337 * write out any unsynced meta data changes now */
340 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
341 sib.sib_reason = SIB_HELPER_PRE;
342 sib.helper_name = cmd;
343 drbd_bcast_event(mdev, &sib);
344 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
346 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
347 usermode_helper, cmd, mb,
348 (ret >> 8) & 0xff, ret);
350 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
351 usermode_helper, cmd, mb,
352 (ret >> 8) & 0xff, ret);
353 sib.sib_reason = SIB_HELPER_POST;
354 sib.helper_exit_code = ret;
355 drbd_bcast_event(mdev, &sib);
357 if (current == tconn->worker.task)
358 clear_bit(CALLBACK_PENDING, &tconn->flags);
360 if (ret < 0) /* Ignore any ERRNOs we got. */
366 static void conn_md_sync(struct drbd_tconn *tconn)
368 struct drbd_conf *mdev;
372 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
373 kref_get(&mdev->kref);
376 kref_put(&mdev->kref, &drbd_minor_destroy);
382 int conn_khelper(struct drbd_tconn *tconn, char *cmd)
384 char *envp[] = { "HOME=/",
386 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
387 (char[20]) { }, /* address family */
388 (char[60]) { }, /* address */
390 char *argv[] = {usermode_helper, cmd, tconn->name, NULL };
393 setup_khelper_env(tconn, envp);
396 conn_info(tconn, "helper command: %s %s %s\n", usermode_helper, cmd, tconn->name);
397 /* TODO: conn_bcast_event() ?? */
399 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
401 conn_warn(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
402 usermode_helper, cmd, tconn->name,
403 (ret >> 8) & 0xff, ret);
405 conn_info(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
406 usermode_helper, cmd, tconn->name,
407 (ret >> 8) & 0xff, ret);
408 /* TODO: conn_bcast_event() ?? */
410 if (ret < 0) /* Ignore any ERRNOs we got. */
416 static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
418 enum drbd_fencing_p fp = FP_NOT_AVAIL;
419 struct drbd_conf *mdev;
423 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
424 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
425 fp = max_t(enum drbd_fencing_p, fp,
426 rcu_dereference(mdev->ldev->disk_conf)->fencing);
435 bool conn_try_outdate_peer(struct drbd_tconn *tconn)
437 union drbd_state mask = { };
438 union drbd_state val = { };
439 enum drbd_fencing_p fp;
443 if (tconn->cstate >= C_WF_REPORT_PARAMS) {
444 conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");
448 fp = highest_fencing_policy(tconn);
451 conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");
458 r = conn_khelper(tconn, "fence-peer");
460 switch ((r>>8) & 0xff) {
461 case 3: /* peer is inconsistent */
462 ex_to_string = "peer is inconsistent or worse";
464 val.pdsk = D_INCONSISTENT;
466 case 4: /* peer got outdated, or was already outdated */
467 ex_to_string = "peer was fenced";
469 val.pdsk = D_OUTDATED;
471 case 5: /* peer was down */
472 if (conn_highest_disk(tconn) == D_UP_TO_DATE) {
473 /* we will(have) create(d) a new UUID anyways... */
474 ex_to_string = "peer is unreachable, assumed to be dead";
476 val.pdsk = D_OUTDATED;
478 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
481 case 6: /* Peer is primary, voluntarily outdate myself.
482 * This is useful when an unconnected R_SECONDARY is asked to
483 * become R_PRIMARY, but finds the other peer being active. */
484 ex_to_string = "peer is active";
485 conn_warn(tconn, "Peer is primary, outdating myself.\n");
487 val.disk = D_OUTDATED;
490 if (fp != FP_STONITH)
491 conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");
492 ex_to_string = "peer was stonithed";
494 val.pdsk = D_OUTDATED;
497 /* The script is broken ... */
498 conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
499 return false; /* Eventually leave IO frozen */
502 conn_info(tconn, "fence-peer helper returned %d (%s)\n",
503 (r>>8) & 0xff, ex_to_string);
508 conn_request_state(tconn, mask, val, CS_VERBOSE);
509 here, because we might were able to re-establish the connection in the
511 spin_lock_irq(&tconn->req_lock);
512 if (tconn->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &tconn->flags))
513 _conn_request_state(tconn, mask, val, CS_VERBOSE);
514 spin_unlock_irq(&tconn->req_lock);
516 return conn_highest_pdsk(tconn) <= D_OUTDATED;
519 static int _try_outdate_peer_async(void *data)
521 struct drbd_tconn *tconn = (struct drbd_tconn *)data;
523 conn_try_outdate_peer(tconn);
525 kref_put(&tconn->kref, &conn_destroy);
529 void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
531 struct task_struct *opa;
533 kref_get(&tconn->kref);
534 opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
536 conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
537 kref_put(&tconn->kref, &conn_destroy);
542 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
544 const int max_tries = 4;
545 enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
549 union drbd_state mask, val;
551 if (new_role == R_PRIMARY)
552 request_ping(mdev->tconn); /* Detect a dead peer ASAP */
554 mutex_lock(mdev->state_mutex);
556 mask.i = 0; mask.role = R_MASK;
557 val.i = 0; val.role = new_role;
559 while (try++ < max_tries) {
560 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
562 /* in case we first succeeded to outdate,
563 * but now suddenly could establish a connection */
564 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
570 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
571 (mdev->state.disk < D_UP_TO_DATE &&
572 mdev->state.disk >= D_INCONSISTENT)) {
574 val.disk = D_UP_TO_DATE;
579 if (rv == SS_NO_UP_TO_DATE_DISK &&
580 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
581 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
583 if (conn_try_outdate_peer(mdev->tconn)) {
584 val.disk = D_UP_TO_DATE;
590 if (rv == SS_NOTHING_TO_DO)
592 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
593 if (!conn_try_outdate_peer(mdev->tconn) && force) {
594 dev_warn(DEV, "Forced into split brain situation!\n");
596 val.pdsk = D_OUTDATED;
601 if (rv == SS_TWO_PRIMARIES) {
602 /* Maybe the peer is detected as dead very soon...
603 retry at most once more in this case. */
606 nc = rcu_dereference(mdev->tconn->net_conf);
607 timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
609 schedule_timeout_interruptible(timeo);
614 if (rv < SS_SUCCESS) {
615 rv = _drbd_request_state(mdev, mask, val,
616 CS_VERBOSE + CS_WAIT_COMPLETE);
627 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
629 /* Wait until nothing is on the fly :) */
630 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
632 /* FIXME also wait for all pending P_BARRIER_ACK? */
634 if (new_role == R_SECONDARY) {
635 set_disk_ro(mdev->vdisk, true);
636 if (get_ldev(mdev)) {
637 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
641 mutex_lock(&mdev->tconn->conf_update);
642 nc = mdev->tconn->net_conf;
644 nc->discard_my_data = 0; /* without copy; single bit op is atomic */
645 mutex_unlock(&mdev->tconn->conf_update);
647 set_disk_ro(mdev->vdisk, false);
648 if (get_ldev(mdev)) {
649 if (((mdev->state.conn < C_CONNECTED ||
650 mdev->state.pdsk <= D_FAILED)
651 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
652 drbd_uuid_new_current(mdev);
654 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
659 /* writeout of activity log covered areas of the bitmap
660 * to stable storage done in after state change already */
662 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
663 /* if this was forced, we should consider sync */
665 drbd_send_uuids(mdev);
666 drbd_send_current_state(mdev);
671 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
673 mutex_unlock(mdev->state_mutex);
677 static const char *from_attrs_err_to_txt(int err)
679 return err == -ENOMSG ? "required attribute missing" :
680 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
681 err == -EEXIST ? "can not change invariant setting" :
682 "invalid attribute value";
685 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
687 struct set_role_parms parms;
689 enum drbd_ret_code retcode;
691 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
692 if (!adm_ctx.reply_skb)
694 if (retcode != NO_ERROR)
697 memset(&parms, 0, sizeof(parms));
698 if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
699 err = set_role_parms_from_attrs(&parms, info);
701 retcode = ERR_MANDATORY_TAG;
702 drbd_msg_put_info(from_attrs_err_to_txt(err));
707 if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
708 retcode = drbd_set_role(adm_ctx.mdev, R_PRIMARY, parms.assume_uptodate);
710 retcode = drbd_set_role(adm_ctx.mdev, R_SECONDARY, 0);
712 drbd_adm_finish(info, retcode);
716 /* initializes the md.*_offset members, so we are able to find
717 * the on disk meta data */
718 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
719 struct drbd_backing_dev *bdev)
721 sector_t md_size_sect = 0;
725 meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
727 switch (meta_dev_idx) {
729 /* v07 style fixed size indexed meta data */
730 bdev->md.md_size_sect = MD_RESERVED_SECT;
731 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
732 bdev->md.al_offset = MD_AL_OFFSET;
733 bdev->md.bm_offset = MD_BM_OFFSET;
735 case DRBD_MD_INDEX_FLEX_EXT:
736 /* just occupy the full device; unit: sectors */
737 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
738 bdev->md.md_offset = 0;
739 bdev->md.al_offset = MD_AL_OFFSET;
740 bdev->md.bm_offset = MD_BM_OFFSET;
742 case DRBD_MD_INDEX_INTERNAL:
743 case DRBD_MD_INDEX_FLEX_INT:
744 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
745 /* al size is still fixed */
746 bdev->md.al_offset = -MD_AL_SECTORS;
747 /* we need (slightly less than) ~ this much bitmap sectors: */
748 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
749 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
750 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
751 md_size_sect = ALIGN(md_size_sect, 8);
753 /* plus the "drbd meta data super block",
754 * and the activity log; */
755 md_size_sect += MD_BM_OFFSET;
757 bdev->md.md_size_sect = md_size_sect;
758 /* bitmap offset is adjusted by 'super' block size */
759 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
765 /* input size is expected to be in KB */
766 char *ppsize(char *buf, unsigned long long size)
768 /* Needs 9 bytes at max including trailing NUL:
769 * -1ULL ==> "16384 EB" */
770 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
772 while (size >= 10000 && base < sizeof(units)-1) {
774 size = (size >> 10) + !!(size & (1<<9));
777 sprintf(buf, "%u %cB", (unsigned)size, units[base]);
782 /* there is still a theoretical deadlock when called from receiver
783 * on an D_INCONSISTENT R_PRIMARY:
784 * remote READ does inc_ap_bio, receiver would need to receive answer
785 * packet from remote to dec_ap_bio again.
786 * receiver receive_sizes(), comes here,
787 * waits for ap_bio_cnt == 0. -> deadlock.
788 * but this cannot happen, actually, because:
789 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
790 * (not connected, or bad/no disk on peer):
791 * see drbd_fail_request_early, ap_bio_cnt is zero.
792 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
793 * peer may not initiate a resize.
795 /* Note these are not to be confused with
796 * drbd_adm_suspend_io/drbd_adm_resume_io,
797 * which are (sub) state changes triggered by admin (drbdsetup),
798 * and can be long lived.
799 * This changes an mdev->flag, is triggered by drbd internals,
800 * and should be short-lived. */
801 void drbd_suspend_io(struct drbd_conf *mdev)
803 set_bit(SUSPEND_IO, &mdev->flags);
804 if (drbd_suspended(mdev))
806 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
809 void drbd_resume_io(struct drbd_conf *mdev)
811 clear_bit(SUSPEND_IO, &mdev->flags);
812 wake_up(&mdev->misc_wait);
816 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
817 * @mdev: DRBD device.
819 * Returns 0 on success, negative return values indicate errors.
820 * You should call drbd_md_sync() after calling this function.
822 enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
824 sector_t prev_first_sect, prev_size; /* previous meta location */
825 sector_t la_size, u_size;
829 int md_moved, la_size_changed;
830 enum determine_dev_size rv = unchanged;
833 * application request passes inc_ap_bio,
834 * but then cannot get an AL-reference.
835 * this function later may wait on ap_bio_cnt == 0. -> deadlock.
838 * Suspend IO right here.
839 * still lock the act_log to not trigger ASSERTs there.
841 drbd_suspend_io(mdev);
843 /* no wait necessary anymore, actually we could assert that */
844 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
846 prev_first_sect = drbd_md_first_sector(mdev->ldev);
847 prev_size = mdev->ldev->md.md_size_sect;
848 la_size = mdev->ldev->md.la_size_sect;
850 /* TODO: should only be some assert here, not (re)init... */
851 drbd_md_set_sector_offsets(mdev, mdev->ldev);
854 u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
856 size = drbd_new_dev_size(mdev, mdev->ldev, u_size, flags & DDSF_FORCED);
858 if (drbd_get_capacity(mdev->this_bdev) != size ||
859 drbd_bm_capacity(mdev) != size) {
861 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
863 /* currently there is only one error: ENOMEM! */
864 size = drbd_bm_capacity(mdev)>>1;
866 dev_err(DEV, "OUT OF MEMORY! "
867 "Could not allocate bitmap!\n");
869 dev_err(DEV, "BM resizing failed. "
870 "Leaving size unchanged at size = %lu KB\n",
871 (unsigned long)size);
875 /* racy, see comments above. */
876 drbd_set_my_capacity(mdev, size);
877 mdev->ldev->md.la_size_sect = size;
878 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
879 (unsigned long long)size>>1);
881 if (rv == dev_size_error)
884 la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
886 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
887 || prev_size != mdev->ldev->md.md_size_sect;
889 if (la_size_changed || md_moved) {
892 drbd_al_shrink(mdev); /* All extents inactive. */
893 dev_info(DEV, "Writing the whole bitmap, %s\n",
894 la_size_changed && md_moved ? "size changed and md moved" :
895 la_size_changed ? "size changed" : "md moved");
896 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
897 err = drbd_bitmap_io(mdev, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
898 "size changed", BM_LOCKED_MASK);
903 drbd_md_mark_dirty(mdev);
911 lc_unlock(mdev->act_log);
912 wake_up(&mdev->al_wait);
913 drbd_resume_io(mdev);
919 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
920 sector_t u_size, int assume_peer_has_space)
922 sector_t p_size = mdev->p_size; /* partner's disk size. */
923 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
924 sector_t m_size; /* my size */
927 m_size = drbd_get_max_capacity(bdev);
929 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
930 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
934 if (p_size && m_size) {
935 size = min_t(sector_t, p_size, m_size);
939 if (m_size && m_size < size)
941 if (p_size && p_size < size)
952 dev_err(DEV, "Both nodes diskless!\n");
956 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
957 (unsigned long)u_size>>1, (unsigned long)size>>1);
966 * drbd_check_al_size() - Ensures that the AL is of the right size
967 * @mdev: DRBD device.
969 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
970 * failed, and 0 on success. You should call drbd_md_sync() after you called
973 static int drbd_check_al_size(struct drbd_conf *mdev, struct disk_conf *dc)
975 struct lru_cache *n, *t;
976 struct lc_element *e;
981 mdev->act_log->nr_elements == dc->al_extents)
986 n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
987 dc->al_extents, sizeof(struct lc_element), 0);
990 dev_err(DEV, "Cannot allocate act_log lru!\n");
993 spin_lock_irq(&mdev->al_lock);
995 for (i = 0; i < t->nr_elements; i++) {
996 e = lc_element_by_index(t, i);
998 dev_err(DEV, "refcnt(%d)==%d\n",
999 e->lc_number, e->refcnt);
1000 in_use += e->refcnt;
1005 spin_unlock_irq(&mdev->al_lock);
1007 dev_err(DEV, "Activity log still in use!\n");
1014 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
1018 static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
1020 struct request_queue * const q = mdev->rq_queue;
1021 int max_hw_sectors = max_bio_size >> 9;
1022 int max_segments = 0;
1024 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1025 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1027 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
1029 max_segments = rcu_dereference(mdev->ldev->disk_conf)->max_bio_bvecs;
1034 blk_queue_logical_block_size(q, 512);
1035 blk_queue_max_hw_sectors(q, max_hw_sectors);
1036 /* This is the workaround for "bio would need to, but cannot, be split" */
1037 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1038 blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
1040 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1041 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1043 blk_queue_stack_limits(q, b);
1045 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
1046 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
1047 q->backing_dev_info.ra_pages,
1048 b->backing_dev_info.ra_pages);
1049 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1055 void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
1057 int now, new, local, peer;
1059 now = queue_max_hw_sectors(mdev->rq_queue) << 9;
1060 local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
1061 peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
1063 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1064 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
1065 mdev->local_max_bio_size = local;
1069 /* We may ignore peer limits if the peer is modern enough.
1070 Because new from 8.3.8 onwards the peer can use multiple
1071 BIOs for a single peer_request */
1072 if (mdev->state.conn >= C_CONNECTED) {
1073 if (mdev->tconn->agreed_pro_version < 94)
1074 peer = min_t(int, mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
1075 /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
1076 else if (mdev->tconn->agreed_pro_version == 94)
1077 peer = DRBD_MAX_SIZE_H80_PACKET;
1078 else if (mdev->tconn->agreed_pro_version < 100)
1079 peer = DRBD_MAX_BIO_SIZE_P95; /* drbd 8.3.8 onwards, before 8.4.0 */
1081 peer = DRBD_MAX_BIO_SIZE;
1084 new = min_t(int, local, peer);
1086 if (mdev->state.role == R_PRIMARY && new < now)
1087 dev_err(DEV, "ASSERT FAILED new < now; (%d < %d)\n", new, now);
1090 dev_info(DEV, "max BIO size = %u\n", new);
1092 drbd_setup_queue_param(mdev, new);
1095 /* Starts the worker thread */
1096 static void conn_reconfig_start(struct drbd_tconn *tconn)
1098 drbd_thread_start(&tconn->worker);
1099 conn_flush_workqueue(tconn);
1102 /* if still unconfigured, stops worker again. */
1103 static void conn_reconfig_done(struct drbd_tconn *tconn)
1106 spin_lock_irq(&tconn->req_lock);
1107 stop_threads = conn_all_vols_unconf(tconn) &&
1108 tconn->cstate == C_STANDALONE;
1109 spin_unlock_irq(&tconn->req_lock);
1111 /* asender is implicitly stopped by receiver
1112 * in conn_disconnect() */
1113 drbd_thread_stop(&tconn->receiver);
1114 drbd_thread_stop(&tconn->worker);
1118 /* Make sure IO is suspended before calling this function(). */
1119 static void drbd_suspend_al(struct drbd_conf *mdev)
1123 if (!lc_try_lock(mdev->act_log)) {
1124 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
1128 drbd_al_shrink(mdev);
1129 spin_lock_irq(&mdev->tconn->req_lock);
1130 if (mdev->state.conn < C_CONNECTED)
1131 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
1132 spin_unlock_irq(&mdev->tconn->req_lock);
1133 lc_unlock(mdev->act_log);
1136 dev_info(DEV, "Suspended AL updates\n");
1140 static bool should_set_defaults(struct genl_info *info)
1142 unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1143 return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1146 static void enforce_disk_conf_limits(struct disk_conf *dc)
1148 if (dc->al_extents < DRBD_AL_EXTENTS_MIN)
1149 dc->al_extents = DRBD_AL_EXTENTS_MIN;
1150 if (dc->al_extents > DRBD_AL_EXTENTS_MAX)
1151 dc->al_extents = DRBD_AL_EXTENTS_MAX;
1153 if (dc->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1154 dc->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1157 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1159 enum drbd_ret_code retcode;
1160 struct drbd_conf *mdev;
1161 struct disk_conf *new_disk_conf, *old_disk_conf;
1162 struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
1165 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1166 if (!adm_ctx.reply_skb)
1168 if (retcode != NO_ERROR)
1171 mdev = adm_ctx.mdev;
1173 /* we also need a disk
1174 * to change the options on */
1175 if (!get_ldev(mdev)) {
1176 retcode = ERR_NO_DISK;
1180 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
1181 if (!new_disk_conf) {
1182 retcode = ERR_NOMEM;
1186 mutex_lock(&mdev->tconn->conf_update);
1187 old_disk_conf = mdev->ldev->disk_conf;
1188 *new_disk_conf = *old_disk_conf;
1189 if (should_set_defaults(info))
1190 set_disk_conf_defaults(new_disk_conf);
1192 err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1193 if (err && err != -ENOMSG) {
1194 retcode = ERR_MANDATORY_TAG;
1195 drbd_msg_put_info(from_attrs_err_to_txt(err));
1198 if (!expect(new_disk_conf->resync_rate >= 1))
1199 new_disk_conf->resync_rate = 1;
1201 enforce_disk_conf_limits(new_disk_conf);
1203 fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1204 if (fifo_size != mdev->rs_plan_s->size) {
1205 new_plan = fifo_alloc(fifo_size);
1207 dev_err(DEV, "kmalloc of fifo_buffer failed");
1208 retcode = ERR_NOMEM;
1213 drbd_suspend_io(mdev);
1214 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1215 drbd_al_shrink(mdev);
1216 err = drbd_check_al_size(mdev, new_disk_conf);
1217 lc_unlock(mdev->act_log);
1218 wake_up(&mdev->al_wait);
1219 drbd_resume_io(mdev);
1222 retcode = ERR_NOMEM;
1226 write_lock_irq(&global_state_lock);
1227 retcode = drbd_resync_after_valid(mdev, new_disk_conf->resync_after);
1228 if (retcode == NO_ERROR) {
1229 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
1230 drbd_resync_after_changed(mdev);
1232 write_unlock_irq(&global_state_lock);
1234 if (retcode != NO_ERROR)
1238 old_plan = mdev->rs_plan_s;
1239 rcu_assign_pointer(mdev->rs_plan_s, new_plan);
1242 mutex_unlock(&mdev->tconn->conf_update);
1244 if (new_disk_conf->al_updates)
1245 mdev->ldev->md.flags &= MDF_AL_DISABLED;
1247 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1249 drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1253 if (mdev->state.conn >= C_CONNECTED)
1254 drbd_send_sync_param(mdev);
1257 kfree(old_disk_conf);
1259 mod_timer(&mdev->request_timer, jiffies + HZ);
1263 mutex_unlock(&mdev->tconn->conf_update);
1265 kfree(new_disk_conf);
1270 drbd_adm_finish(info, retcode);
1274 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1276 struct drbd_conf *mdev;
1278 enum drbd_ret_code retcode;
1279 enum determine_dev_size dd;
1280 sector_t max_possible_sectors;
1281 sector_t min_md_device_sectors;
1282 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1283 struct disk_conf *new_disk_conf = NULL;
1284 struct block_device *bdev;
1285 struct lru_cache *resync_lru = NULL;
1286 struct fifo_buffer *new_plan = NULL;
1287 union drbd_state ns, os;
1288 enum drbd_state_rv rv;
1289 struct net_conf *nc;
1291 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1292 if (!adm_ctx.reply_skb)
1294 if (retcode != NO_ERROR)
1297 mdev = adm_ctx.mdev;
1298 conn_reconfig_start(mdev->tconn);
1300 /* if you want to reconfigure, please tear down first */
1301 if (mdev->state.disk > D_DISKLESS) {
1302 retcode = ERR_DISK_CONFIGURED;
1305 /* It may just now have detached because of IO error. Make sure
1306 * drbd_ldev_destroy is done already, we may end up here very fast,
1307 * e.g. if someone calls attach from the on-io-error handler,
1308 * to realize a "hot spare" feature (not that I'd recommend that) */
1309 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1311 /* make sure there is no leftover from previous force-detach attempts */
1312 clear_bit(FORCE_DETACH, &mdev->flags);
1314 /* and no leftover from previously aborted resync or verify, either */
1316 mdev->rs_failed = 0;
1317 atomic_set(&mdev->rs_pending_cnt, 0);
1319 /* allocation not in the IO path, drbdsetup context */
1320 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1322 retcode = ERR_NOMEM;
1325 spin_lock_init(&nbc->md.uuid_lock);
1327 new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1328 if (!new_disk_conf) {
1329 retcode = ERR_NOMEM;
1332 nbc->disk_conf = new_disk_conf;
1334 set_disk_conf_defaults(new_disk_conf);
1335 err = disk_conf_from_attrs(new_disk_conf, info);
1337 retcode = ERR_MANDATORY_TAG;
1338 drbd_msg_put_info(from_attrs_err_to_txt(err));
1342 enforce_disk_conf_limits(new_disk_conf);
1344 new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1346 retcode = ERR_NOMEM;
1350 if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1351 retcode = ERR_MD_IDX_INVALID;
1356 nc = rcu_dereference(mdev->tconn->net_conf);
1358 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1360 retcode = ERR_STONITH_AND_PROT_A;
1366 bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
1367 FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
1369 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
1371 retcode = ERR_OPEN_DISK;
1374 nbc->backing_bdev = bdev;
1377 * meta_dev_idx >= 0: external fixed size, possibly multiple
1378 * drbd sharing one meta device. TODO in that case, paranoia
1379 * check that [md_bdev, meta_dev_idx] is not yet used by some
1380 * other drbd minor! (if you use drbd.conf + drbdadm, that
1381 * should check it for you already; but if you don't, or
1382 * someone fooled it, we need to double check here)
1384 bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
1385 FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1386 (new_disk_conf->meta_dev_idx < 0) ?
1387 (void *)mdev : (void *)drbd_m_holder);
1389 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
1391 retcode = ERR_OPEN_MD_DISK;
1394 nbc->md_bdev = bdev;
1396 if ((nbc->backing_bdev == nbc->md_bdev) !=
1397 (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1398 new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1399 retcode = ERR_MD_IDX_INVALID;
1403 resync_lru = lc_create("resync", drbd_bm_ext_cache,
1404 1, 61, sizeof(struct bm_extent),
1405 offsetof(struct bm_extent, lce));
1407 retcode = ERR_NOMEM;
1411 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1412 drbd_md_set_sector_offsets(mdev, nbc);
1414 if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
1415 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1416 (unsigned long long) drbd_get_max_capacity(nbc),
1417 (unsigned long long) new_disk_conf->disk_size);
1418 retcode = ERR_DISK_TOO_SMALL;
1422 if (new_disk_conf->meta_dev_idx < 0) {
1423 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1424 /* at least one MB, otherwise it does not make sense */
1425 min_md_device_sectors = (2<<10);
1427 max_possible_sectors = DRBD_MAX_SECTORS;
1428 min_md_device_sectors = MD_RESERVED_SECT * (new_disk_conf->meta_dev_idx + 1);
1431 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1432 retcode = ERR_MD_DISK_TOO_SMALL;
1433 dev_warn(DEV, "refusing attach: md-device too small, "
1434 "at least %llu sectors needed for this meta-disk type\n",
1435 (unsigned long long) min_md_device_sectors);
1439 /* Make sure the new disk is big enough
1440 * (we may currently be R_PRIMARY with no local disk...) */
1441 if (drbd_get_max_capacity(nbc) <
1442 drbd_get_capacity(mdev->this_bdev)) {
1443 retcode = ERR_DISK_TOO_SMALL;
1447 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1449 if (nbc->known_size > max_possible_sectors) {
1450 dev_warn(DEV, "==> truncating very big lower level device "
1451 "to currently maximum possible %llu sectors <==\n",
1452 (unsigned long long) max_possible_sectors);
1453 if (new_disk_conf->meta_dev_idx >= 0)
1454 dev_warn(DEV, "==>> using internal or flexible "
1455 "meta data may help <<==\n");
1458 drbd_suspend_io(mdev);
1459 /* also wait for the last barrier ack. */
1460 /* FIXME see also https://daiquiri.linbit/cgi-bin/bugzilla/show_bug.cgi?id=171
1461 * We need a way to either ignore barrier acks for barriers sent before a device
1462 * was attached, or a way to wait for all pending barrier acks to come in.
1463 * As barriers are counted per resource,
1464 * we'd need to suspend io on all devices of a resource.
1466 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || drbd_suspended(mdev));
1467 /* and for any other previously queued work */
1468 drbd_flush_workqueue(mdev);
1470 rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1471 retcode = rv; /* FIXME: Type mismatch. */
1472 drbd_resume_io(mdev);
1473 if (rv < SS_SUCCESS)
1476 if (!get_ldev_if_state(mdev, D_ATTACHING))
1477 goto force_diskless;
1479 drbd_md_set_sector_offsets(mdev, nbc);
1481 if (!mdev->bitmap) {
1482 if (drbd_bm_init(mdev)) {
1483 retcode = ERR_NOMEM;
1484 goto force_diskless_dec;
1488 retcode = drbd_md_read(mdev, nbc);
1489 if (retcode != NO_ERROR)
1490 goto force_diskless_dec;
1492 if (mdev->state.conn < C_CONNECTED &&
1493 mdev->state.role == R_PRIMARY &&
1494 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1495 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1496 (unsigned long long)mdev->ed_uuid);
1497 retcode = ERR_DATA_NOT_CURRENT;
1498 goto force_diskless_dec;
1501 /* Since we are diskless, fix the activity log first... */
1502 if (drbd_check_al_size(mdev, new_disk_conf)) {
1503 retcode = ERR_NOMEM;
1504 goto force_diskless_dec;
1507 /* Prevent shrinking of consistent devices ! */
1508 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1509 drbd_new_dev_size(mdev, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
1510 dev_warn(DEV, "refusing to truncate a consistent device\n");
1511 retcode = ERR_DISK_TOO_SMALL;
1512 goto force_diskless_dec;
1515 /* Reset the "barriers don't work" bits here, then force meta data to
1516 * be written, to ensure we determine if barriers are supported. */
1517 if (new_disk_conf->md_flushes)
1518 clear_bit(MD_NO_FUA, &mdev->flags);
1520 set_bit(MD_NO_FUA, &mdev->flags);
1522 /* Point of no return reached.
1523 * Devices and memory are no longer released by error cleanup below.
1524 * now mdev takes over responsibility, and the state engine should
1525 * clean it up somewhere. */
1526 D_ASSERT(mdev->ldev == NULL);
1528 mdev->resync = resync_lru;
1529 mdev->rs_plan_s = new_plan;
1532 new_disk_conf = NULL;
1535 drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1537 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1538 set_bit(CRASHED_PRIMARY, &mdev->flags);
1540 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1542 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1543 !(mdev->state.role == R_PRIMARY && mdev->tconn->susp_nod))
1544 set_bit(CRASHED_PRIMARY, &mdev->flags);
1551 drbd_reconsider_max_bio_size(mdev);
1553 /* If I am currently not R_PRIMARY,
1554 * but meta data primary indicator is set,
1555 * I just now recover from a hard crash,
1556 * and have been R_PRIMARY before that crash.
1558 * Now, if I had no connection before that crash
1559 * (have been degraded R_PRIMARY), chances are that
1560 * I won't find my peer now either.
1562 * In that case, and _only_ in that case,
1563 * we use the degr-wfc-timeout instead of the default,
1564 * so we can automatically recover from a crash of a
1565 * degraded but active "cluster" after a certain timeout.
1567 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1568 if (mdev->state.role != R_PRIMARY &&
1569 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1570 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1571 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1573 dd = drbd_determine_dev_size(mdev, 0);
1574 if (dd == dev_size_error) {
1575 retcode = ERR_NOMEM_BITMAP;
1576 goto force_diskless_dec;
1577 } else if (dd == grew)
1578 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1580 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC) ||
1581 (test_bit(CRASHED_PRIMARY, &mdev->flags) &&
1582 drbd_md_test_flag(mdev->ldev, MDF_AL_DISABLED))) {
1583 dev_info(DEV, "Assuming that all blocks are out of sync "
1584 "(aka FullSync)\n");
1585 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1586 "set_n_write from attaching", BM_LOCKED_MASK)) {
1587 retcode = ERR_IO_MD_DISK;
1588 goto force_diskless_dec;
1591 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1592 "read from attaching", BM_LOCKED_MASK)) {
1593 retcode = ERR_IO_MD_DISK;
1594 goto force_diskless_dec;
1598 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1599 drbd_suspend_al(mdev); /* IO is still suspended here... */
1601 spin_lock_irq(&mdev->tconn->req_lock);
1602 os = drbd_read_state(mdev);
1604 /* If MDF_CONSISTENT is not set go into inconsistent state,
1605 otherwise investigate MDF_WasUpToDate...
1606 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1607 otherwise into D_CONSISTENT state.
1609 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1610 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1611 ns.disk = D_CONSISTENT;
1613 ns.disk = D_OUTDATED;
1615 ns.disk = D_INCONSISTENT;
1618 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1619 ns.pdsk = D_OUTDATED;
1622 if (ns.disk == D_CONSISTENT &&
1623 (ns.pdsk == D_OUTDATED || rcu_dereference(mdev->ldev->disk_conf)->fencing == FP_DONT_CARE))
1624 ns.disk = D_UP_TO_DATE;
1626 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1627 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1628 this point, because drbd_request_state() modifies these
1631 if (rcu_dereference(mdev->ldev->disk_conf)->al_updates)
1632 mdev->ldev->md.flags &= MDF_AL_DISABLED;
1634 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1638 /* In case we are C_CONNECTED postpone any decision on the new disk
1639 state after the negotiation phase. */
1640 if (mdev->state.conn == C_CONNECTED) {
1641 mdev->new_state_tmp.i = ns.i;
1643 ns.disk = D_NEGOTIATING;
1645 /* We expect to receive up-to-date UUIDs soon.
1646 To avoid a race in receive_state, free p_uuid while
1647 holding req_lock. I.e. atomic with the state change */
1648 kfree(mdev->p_uuid);
1649 mdev->p_uuid = NULL;
1652 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1653 spin_unlock_irq(&mdev->tconn->req_lock);
1655 if (rv < SS_SUCCESS)
1656 goto force_diskless_dec;
1658 mod_timer(&mdev->request_timer, jiffies + HZ);
1660 if (mdev->state.role == R_PRIMARY)
1661 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1663 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1665 drbd_md_mark_dirty(mdev);
1668 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1670 conn_reconfig_done(mdev->tconn);
1671 drbd_adm_finish(info, retcode);
1677 drbd_force_state(mdev, NS(disk, D_DISKLESS));
1680 conn_reconfig_done(mdev->tconn);
1682 if (nbc->backing_bdev)
1683 blkdev_put(nbc->backing_bdev,
1684 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1686 blkdev_put(nbc->md_bdev,
1687 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1690 kfree(new_disk_conf);
1691 lc_destroy(resync_lru);
1695 drbd_adm_finish(info, retcode);
1699 static int adm_detach(struct drbd_conf *mdev, int force)
1701 enum drbd_state_rv retcode;
1705 set_bit(FORCE_DETACH, &mdev->flags);
1706 drbd_force_state(mdev, NS(disk, D_FAILED));
1707 retcode = SS_SUCCESS;
1711 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1712 drbd_md_get_buffer(mdev); /* make sure there is no in-flight meta-data IO */
1713 retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1714 drbd_md_put_buffer(mdev);
1715 /* D_FAILED will transition to DISKLESS. */
1716 ret = wait_event_interruptible(mdev->misc_wait,
1717 mdev->state.disk != D_FAILED);
1718 drbd_resume_io(mdev);
1719 if ((int)retcode == (int)SS_IS_DISKLESS)
1720 retcode = SS_NOTHING_TO_DO;
1727 /* Detaching the disk is a process in multiple stages. First we need to lock
1728 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1729 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1730 * internal references as well.
1731 * Only then we have finally detached. */
1732 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
1734 enum drbd_ret_code retcode;
1735 struct detach_parms parms = { };
1738 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1739 if (!adm_ctx.reply_skb)
1741 if (retcode != NO_ERROR)
1744 if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
1745 err = detach_parms_from_attrs(&parms, info);
1747 retcode = ERR_MANDATORY_TAG;
1748 drbd_msg_put_info(from_attrs_err_to_txt(err));
1753 retcode = adm_detach(adm_ctx.mdev, parms.force_detach);
1755 drbd_adm_finish(info, retcode);
1759 static bool conn_resync_running(struct drbd_tconn *tconn)
1761 struct drbd_conf *mdev;
1766 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1767 if (mdev->state.conn == C_SYNC_SOURCE ||
1768 mdev->state.conn == C_SYNC_TARGET ||
1769 mdev->state.conn == C_PAUSED_SYNC_S ||
1770 mdev->state.conn == C_PAUSED_SYNC_T) {
1780 static bool conn_ov_running(struct drbd_tconn *tconn)
1782 struct drbd_conf *mdev;
1787 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1788 if (mdev->state.conn == C_VERIFY_S ||
1789 mdev->state.conn == C_VERIFY_T) {
1799 static enum drbd_ret_code
1800 _check_net_options(struct drbd_tconn *tconn, struct net_conf *old_conf, struct net_conf *new_conf)
1802 struct drbd_conf *mdev;
1805 if (old_conf && tconn->cstate == C_WF_REPORT_PARAMS && tconn->agreed_pro_version < 100) {
1806 if (new_conf->wire_protocol != old_conf->wire_protocol)
1807 return ERR_NEED_APV_100;
1809 if (new_conf->two_primaries != old_conf->two_primaries)
1810 return ERR_NEED_APV_100;
1812 if (!new_conf->integrity_alg != !old_conf->integrity_alg)
1813 return ERR_NEED_APV_100;
1815 if (strcmp(new_conf->integrity_alg, old_conf->integrity_alg))
1816 return ERR_NEED_APV_100;
1819 if (!new_conf->two_primaries &&
1820 conn_highest_role(tconn) == R_PRIMARY &&
1821 conn_highest_peer(tconn) == R_PRIMARY)
1822 return ERR_NEED_ALLOW_TWO_PRI;
1824 if (new_conf->two_primaries &&
1825 (new_conf->wire_protocol != DRBD_PROT_C))
1826 return ERR_NOT_PROTO_C;
1828 idr_for_each_entry(&tconn->volumes, mdev, i) {
1829 if (get_ldev(mdev)) {
1830 enum drbd_fencing_p fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
1832 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
1833 return ERR_STONITH_AND_PROT_A;
1835 if (mdev->state.role == R_PRIMARY && new_conf->discard_my_data)
1836 return ERR_DISCARD_IMPOSSIBLE;
1839 if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A)
1840 return ERR_CONG_NOT_PROTO_A;
1845 static enum drbd_ret_code
1846 check_net_options(struct drbd_tconn *tconn, struct net_conf *new_conf)
1848 static enum drbd_ret_code rv;
1849 struct drbd_conf *mdev;
1853 rv = _check_net_options(tconn, rcu_dereference(tconn->net_conf), new_conf);
1856 /* tconn->volumes protected by genl_lock() here */
1857 idr_for_each_entry(&tconn->volumes, mdev, i) {
1858 if (!mdev->bitmap) {
1859 if(drbd_bm_init(mdev))
1868 struct crypto_hash *verify_tfm;
1869 struct crypto_hash *csums_tfm;
1870 struct crypto_hash *cram_hmac_tfm;
1871 struct crypto_hash *integrity_tfm;
1875 alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
1880 *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
1889 static enum drbd_ret_code
1890 alloc_crypto(struct crypto *crypto, struct net_conf *new_conf)
1892 char hmac_name[CRYPTO_MAX_ALG_NAME];
1893 enum drbd_ret_code rv;
1895 rv = alloc_hash(&crypto->csums_tfm, new_conf->csums_alg,
1899 rv = alloc_hash(&crypto->verify_tfm, new_conf->verify_alg,
1903 rv = alloc_hash(&crypto->integrity_tfm, new_conf->integrity_alg,
1907 if (new_conf->cram_hmac_alg[0] != 0) {
1908 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1909 new_conf->cram_hmac_alg);
1911 rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
1918 static void free_crypto(struct crypto *crypto)
1920 crypto_free_hash(crypto->cram_hmac_tfm);
1921 crypto_free_hash(crypto->integrity_tfm);
1922 crypto_free_hash(crypto->csums_tfm);
1923 crypto_free_hash(crypto->verify_tfm);
1926 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
1928 enum drbd_ret_code retcode;
1929 struct drbd_tconn *tconn;
1930 struct net_conf *old_conf, *new_conf = NULL;
1932 int ovr; /* online verify running */
1933 int rsr; /* re-sync running */
1934 struct crypto crypto = { };
1936 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
1937 if (!adm_ctx.reply_skb)
1939 if (retcode != NO_ERROR)
1942 tconn = adm_ctx.tconn;
1944 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1946 retcode = ERR_NOMEM;
1950 conn_reconfig_start(tconn);
1952 mutex_lock(&tconn->data.mutex);
1953 mutex_lock(&tconn->conf_update);
1954 old_conf = tconn->net_conf;
1957 drbd_msg_put_info("net conf missing, try connect");
1958 retcode = ERR_INVALID_REQUEST;
1962 *new_conf = *old_conf;
1963 if (should_set_defaults(info))
1964 set_net_conf_defaults(new_conf);
1966 err = net_conf_from_attrs_for_change(new_conf, info);
1967 if (err && err != -ENOMSG) {
1968 retcode = ERR_MANDATORY_TAG;
1969 drbd_msg_put_info(from_attrs_err_to_txt(err));
1973 retcode = check_net_options(tconn, new_conf);
1974 if (retcode != NO_ERROR)
1977 /* re-sync running */
1978 rsr = conn_resync_running(tconn);
1979 if (rsr && strcmp(new_conf->csums_alg, old_conf->csums_alg)) {
1980 retcode = ERR_CSUMS_RESYNC_RUNNING;
1984 /* online verify running */
1985 ovr = conn_ov_running(tconn);
1986 if (ovr && strcmp(new_conf->verify_alg, old_conf->verify_alg)) {
1987 retcode = ERR_VERIFY_RUNNING;
1991 retcode = alloc_crypto(&crypto, new_conf);
1992 if (retcode != NO_ERROR)
1995 rcu_assign_pointer(tconn->net_conf, new_conf);
1998 crypto_free_hash(tconn->csums_tfm);
1999 tconn->csums_tfm = crypto.csums_tfm;
2000 crypto.csums_tfm = NULL;
2003 crypto_free_hash(tconn->verify_tfm);
2004 tconn->verify_tfm = crypto.verify_tfm;
2005 crypto.verify_tfm = NULL;
2008 crypto_free_hash(tconn->integrity_tfm);
2009 tconn->integrity_tfm = crypto.integrity_tfm;
2010 if (tconn->cstate >= C_WF_REPORT_PARAMS && tconn->agreed_pro_version >= 100)
2011 /* Do this without trying to take tconn->data.mutex again. */
2012 __drbd_send_protocol(tconn, P_PROTOCOL_UPDATE);
2014 crypto_free_hash(tconn->cram_hmac_tfm);
2015 tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2017 mutex_unlock(&tconn->conf_update);
2018 mutex_unlock(&tconn->data.mutex);
2022 if (tconn->cstate >= C_WF_REPORT_PARAMS)
2023 drbd_send_sync_param(minor_to_mdev(conn_lowest_minor(tconn)));
2028 mutex_unlock(&tconn->conf_update);
2029 mutex_unlock(&tconn->data.mutex);
2030 free_crypto(&crypto);
2033 conn_reconfig_done(tconn);
2035 drbd_adm_finish(info, retcode);
2039 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
2041 struct drbd_conf *mdev;
2042 struct net_conf *old_conf, *new_conf = NULL;
2043 struct crypto crypto = { };
2044 struct drbd_tconn *tconn;
2045 enum drbd_ret_code retcode;
2049 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2051 if (!adm_ctx.reply_skb)
2053 if (retcode != NO_ERROR)
2055 if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
2056 drbd_msg_put_info("connection endpoint(s) missing");
2057 retcode = ERR_INVALID_REQUEST;
2061 /* No need for _rcu here. All reconfiguration is
2062 * strictly serialized on genl_lock(). We are protected against
2063 * concurrent reconfiguration/addition/deletion */
2064 list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
2065 if (nla_len(adm_ctx.my_addr) == tconn->my_addr_len &&
2066 !memcmp(nla_data(adm_ctx.my_addr), &tconn->my_addr, tconn->my_addr_len)) {
2067 retcode = ERR_LOCAL_ADDR;
2071 if (nla_len(adm_ctx.peer_addr) == tconn->peer_addr_len &&
2072 !memcmp(nla_data(adm_ctx.peer_addr), &tconn->peer_addr, tconn->peer_addr_len)) {
2073 retcode = ERR_PEER_ADDR;
2078 tconn = adm_ctx.tconn;
2079 conn_reconfig_start(tconn);
2081 if (tconn->cstate > C_STANDALONE) {
2082 retcode = ERR_NET_CONFIGURED;
2086 /* allocation not in the IO path, drbdsetup / netlink process context */
2087 new_conf = kzalloc(sizeof(*new_conf), GFP_KERNEL);
2089 retcode = ERR_NOMEM;
2093 set_net_conf_defaults(new_conf);
2095 err = net_conf_from_attrs(new_conf, info);
2096 if (err && err != -ENOMSG) {
2097 retcode = ERR_MANDATORY_TAG;
2098 drbd_msg_put_info(from_attrs_err_to_txt(err));
2102 retcode = check_net_options(tconn, new_conf);
2103 if (retcode != NO_ERROR)
2106 retcode = alloc_crypto(&crypto, new_conf);
2107 if (retcode != NO_ERROR)
2110 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2112 conn_flush_workqueue(tconn);
2114 mutex_lock(&tconn->conf_update);
2115 old_conf = tconn->net_conf;
2117 retcode = ERR_NET_CONFIGURED;
2118 mutex_unlock(&tconn->conf_update);
2121 rcu_assign_pointer(tconn->net_conf, new_conf);
2123 conn_free_crypto(tconn);
2124 tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2125 tconn->integrity_tfm = crypto.integrity_tfm;
2126 tconn->csums_tfm = crypto.csums_tfm;
2127 tconn->verify_tfm = crypto.verify_tfm;
2129 tconn->my_addr_len = nla_len(adm_ctx.my_addr);
2130 memcpy(&tconn->my_addr, nla_data(adm_ctx.my_addr), tconn->my_addr_len);
2131 tconn->peer_addr_len = nla_len(adm_ctx.peer_addr);
2132 memcpy(&tconn->peer_addr, nla_data(adm_ctx.peer_addr), tconn->peer_addr_len);
2134 mutex_unlock(&tconn->conf_update);
2137 idr_for_each_entry(&tconn->volumes, mdev, i) {
2143 retcode = conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2145 conn_reconfig_done(tconn);
2146 drbd_adm_finish(info, retcode);
2150 free_crypto(&crypto);
2153 conn_reconfig_done(tconn);
2155 drbd_adm_finish(info, retcode);
2159 static enum drbd_state_rv conn_try_disconnect(struct drbd_tconn *tconn, bool force)
2161 enum drbd_state_rv rv;
2163 rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2164 force ? CS_HARD : 0);
2167 case SS_NOTHING_TO_DO:
2169 case SS_ALREADY_STANDALONE:
2171 case SS_PRIMARY_NOP:
2172 /* Our state checking code wants to see the peer outdated. */
2173 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2174 pdsk, D_OUTDATED), CS_VERBOSE);
2176 case SS_CW_FAILED_BY_PEER:
2177 /* The peer probably wants to see us outdated. */
2178 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2179 disk, D_OUTDATED), 0);
2180 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2181 rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2186 /* no special handling necessary */
2189 if (rv >= SS_SUCCESS) {
2190 enum drbd_state_rv rv2;
2191 /* No one else can reconfigure the network while I am here.
2192 * The state handling only uses drbd_thread_stop_nowait(),
2193 * we want to really wait here until the receiver is no more.
2195 drbd_thread_stop(&adm_ctx.tconn->receiver);
2197 /* Race breaker. This additional state change request may be
2198 * necessary, if this was a forced disconnect during a receiver
2199 * restart. We may have "killed" the receiver thread just
2200 * after drbdd_init() returned. Typically, we should be
2201 * C_STANDALONE already, now, and this becomes a no-op.
2203 rv2 = conn_request_state(tconn, NS(conn, C_STANDALONE),
2204 CS_VERBOSE | CS_HARD);
2205 if (rv2 < SS_SUCCESS)
2207 "unexpected rv2=%d in conn_try_disconnect()\n",
2213 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2215 struct disconnect_parms parms;
2216 struct drbd_tconn *tconn;
2217 enum drbd_state_rv rv;
2218 enum drbd_ret_code retcode;
2221 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
2222 if (!adm_ctx.reply_skb)
2224 if (retcode != NO_ERROR)
2227 tconn = adm_ctx.tconn;
2228 memset(&parms, 0, sizeof(parms));
2229 if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2230 err = disconnect_parms_from_attrs(&parms, info);
2232 retcode = ERR_MANDATORY_TAG;
2233 drbd_msg_put_info(from_attrs_err_to_txt(err));
2238 rv = conn_try_disconnect(tconn, parms.force_disconnect);
2239 if (rv < SS_SUCCESS)
2240 retcode = rv; /* FIXME: Type mismatch. */
2244 drbd_adm_finish(info, retcode);
2248 void resync_after_online_grow(struct drbd_conf *mdev)
2250 int iass; /* I am sync source */
2252 dev_info(DEV, "Resync of new storage after online grow\n");
2253 if (mdev->state.role != mdev->state.peer)
2254 iass = (mdev->state.role == R_PRIMARY);
2256 iass = test_bit(RESOLVE_CONFLICTS, &mdev->tconn->flags);
2259 drbd_start_resync(mdev, C_SYNC_SOURCE);
2261 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2264 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2266 struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
2267 struct resize_parms rs;
2268 struct drbd_conf *mdev;
2269 enum drbd_ret_code retcode;
2270 enum determine_dev_size dd;
2271 enum dds_flags ddsf;
2275 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2276 if (!adm_ctx.reply_skb)
2278 if (retcode != NO_ERROR)
2281 memset(&rs, 0, sizeof(struct resize_parms));
2282 if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2283 err = resize_parms_from_attrs(&rs, info);
2285 retcode = ERR_MANDATORY_TAG;
2286 drbd_msg_put_info(from_attrs_err_to_txt(err));
2291 mdev = adm_ctx.mdev;
2292 if (mdev->state.conn > C_CONNECTED) {
2293 retcode = ERR_RESIZE_RESYNC;
2297 if (mdev->state.role == R_SECONDARY &&
2298 mdev->state.peer == R_SECONDARY) {
2299 retcode = ERR_NO_PRIMARY;
2303 if (!get_ldev(mdev)) {
2304 retcode = ERR_NO_DISK;
2308 if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
2309 retcode = ERR_NEED_APV_93;
2314 u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
2316 if (u_size != (sector_t)rs.resize_size) {
2317 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2318 if (!new_disk_conf) {
2319 retcode = ERR_NOMEM;
2324 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
2325 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
2327 if (new_disk_conf) {
2328 mutex_lock(&mdev->tconn->conf_update);
2329 old_disk_conf = mdev->ldev->disk_conf;
2330 *new_disk_conf = *old_disk_conf;
2331 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2332 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
2333 mutex_unlock(&mdev->tconn->conf_update);
2335 kfree(old_disk_conf);
2338 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2339 dd = drbd_determine_dev_size(mdev, ddsf);
2342 if (dd == dev_size_error) {
2343 retcode = ERR_NOMEM_BITMAP;
2347 if (mdev->state.conn == C_CONNECTED) {
2349 set_bit(RESIZE_PENDING, &mdev->flags);
2351 drbd_send_uuids(mdev);
2352 drbd_send_sizes(mdev, 1, ddsf);
2356 drbd_adm_finish(info, retcode);
2364 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2366 enum drbd_ret_code retcode;
2367 struct drbd_tconn *tconn;
2368 struct res_opts res_opts;
2371 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2372 if (!adm_ctx.reply_skb)
2374 if (retcode != NO_ERROR)
2376 tconn = adm_ctx.tconn;
2378 res_opts = tconn->res_opts;
2379 if (should_set_defaults(info))
2380 set_res_opts_defaults(&res_opts);
2382 err = res_opts_from_attrs(&res_opts, info);
2383 if (err && err != -ENOMSG) {
2384 retcode = ERR_MANDATORY_TAG;
2385 drbd_msg_put_info(from_attrs_err_to_txt(err));
2389 err = set_resource_options(tconn, &res_opts);
2391 retcode = ERR_INVALID_REQUEST;
2393 retcode = ERR_NOMEM;
2397 drbd_adm_finish(info, retcode);
2401 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2403 struct drbd_conf *mdev;
2404 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2406 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2407 if (!adm_ctx.reply_skb)
2409 if (retcode != NO_ERROR)
2412 mdev = adm_ctx.mdev;
2414 /* If there is still bitmap IO pending, probably because of a previous
2415 * resync just being finished, wait for it before requesting a new resync.
2416 * Also wait for it's after_state_ch(). */
2417 drbd_suspend_io(mdev);
2418 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2419 drbd_flush_workqueue(mdev);
2421 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
2423 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
2424 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2426 while (retcode == SS_NEED_CONNECTION) {
2427 spin_lock_irq(&mdev->tconn->req_lock);
2428 if (mdev->state.conn < C_CONNECTED)
2429 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
2430 spin_unlock_irq(&mdev->tconn->req_lock);
2432 if (retcode != SS_NEED_CONNECTION)
2435 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2437 drbd_resume_io(mdev);
2440 drbd_adm_finish(info, retcode);
2444 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2445 union drbd_state mask, union drbd_state val)
2447 enum drbd_ret_code retcode;
2449 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2450 if (!adm_ctx.reply_skb)
2452 if (retcode != NO_ERROR)
2455 retcode = drbd_request_state(adm_ctx.mdev, mask, val);
2457 drbd_adm_finish(info, retcode);
2461 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
2465 rv = drbd_bmio_set_n_write(mdev);
2466 drbd_suspend_al(mdev);
2470 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
2472 int retcode; /* drbd_ret_code, drbd_state_rv */
2473 struct drbd_conf *mdev;
2475 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2476 if (!adm_ctx.reply_skb)
2478 if (retcode != NO_ERROR)
2481 mdev = adm_ctx.mdev;
2483 /* If there is still bitmap IO pending, probably because of a previous
2484 * resync just being finished, wait for it before requesting a new resync.
2485 * Also wait for it's after_state_ch(). */
2486 drbd_suspend_io(mdev);
2487 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2488 drbd_flush_workqueue(mdev);
2490 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
2491 if (retcode < SS_SUCCESS) {
2492 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
2493 /* The peer will get a resync upon connect anyways.
2494 * Just make that into a full resync. */
2495 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
2496 if (retcode >= SS_SUCCESS) {
2497 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
2498 "set_n_write from invalidate_peer",
2499 BM_LOCKED_SET_ALLOWED))
2500 retcode = ERR_IO_MD_DISK;
2503 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
2505 drbd_resume_io(mdev);
2508 drbd_adm_finish(info, retcode);
2512 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2514 enum drbd_ret_code retcode;
2516 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2517 if (!adm_ctx.reply_skb)
2519 if (retcode != NO_ERROR)
2522 if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2523 retcode = ERR_PAUSE_IS_SET;
2525 drbd_adm_finish(info, retcode);
2529 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
2531 union drbd_dev_state s;
2532 enum drbd_ret_code retcode;
2534 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2535 if (!adm_ctx.reply_skb)
2537 if (retcode != NO_ERROR)
2540 if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2541 s = adm_ctx.mdev->state;
2542 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2543 retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2544 s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2546 retcode = ERR_PAUSE_IS_CLEAR;
2551 drbd_adm_finish(info, retcode);
2555 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
2557 return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
2560 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
2562 struct drbd_conf *mdev;
2563 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2565 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2566 if (!adm_ctx.reply_skb)
2568 if (retcode != NO_ERROR)
2571 mdev = adm_ctx.mdev;
2572 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2573 drbd_uuid_new_current(mdev);
2574 clear_bit(NEW_CUR_UUID, &mdev->flags);
2576 drbd_suspend_io(mdev);
2577 retcode = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2578 if (retcode == SS_SUCCESS) {
2579 if (mdev->state.conn < C_CONNECTED)
2580 tl_clear(mdev->tconn);
2581 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2582 tl_restart(mdev->tconn, FAIL_FROZEN_DISK_IO);
2584 drbd_resume_io(mdev);
2587 drbd_adm_finish(info, retcode);
2591 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
2593 return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
2596 int nla_put_drbd_cfg_context(struct sk_buff *skb, struct drbd_tconn *tconn, unsigned vnr)
2599 nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2601 goto nla_put_failure;
2602 if (vnr != VOLUME_UNSPECIFIED &&
2603 nla_put_u32(skb, T_ctx_volume, vnr))
2604 goto nla_put_failure;
2605 if (nla_put_string(skb, T_ctx_resource_name, tconn->name))
2606 goto nla_put_failure;
2607 if (tconn->my_addr_len &&
2608 nla_put(skb, T_ctx_my_addr, tconn->my_addr_len, &tconn->my_addr))
2609 goto nla_put_failure;
2610 if (tconn->peer_addr_len &&
2611 nla_put(skb, T_ctx_peer_addr, tconn->peer_addr_len, &tconn->peer_addr))
2612 goto nla_put_failure;
2613 nla_nest_end(skb, nla);
2618 nla_nest_cancel(skb, nla);
2622 int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
2623 const struct sib_info *sib)
2625 struct state_info *si = NULL; /* for sizeof(si->member); */
2626 struct net_conf *nc;
2630 int exclude_sensitive;
2632 /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2633 * to. So we better exclude_sensitive information.
2635 * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2636 * in the context of the requesting user process. Exclude sensitive
2637 * information, unless current has superuser.
2639 * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2640 * relies on the current implementation of netlink_dump(), which
2641 * executes the dump callback successively from netlink_recvmsg(),
2642 * always in the context of the receiving process */
2643 exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2645 got_ldev = get_ldev(mdev);
2647 /* We need to add connection name and volume number information still.
2648 * Minor number is in drbd_genlmsghdr. */
2649 if (nla_put_drbd_cfg_context(skb, mdev->tconn, mdev->vnr))
2650 goto nla_put_failure;
2652 if (res_opts_to_skb(skb, &mdev->tconn->res_opts, exclude_sensitive))
2653 goto nla_put_failure;
2657 if (disk_conf_to_skb(skb, rcu_dereference(mdev->ldev->disk_conf), exclude_sensitive))
2658 goto nla_put_failure;
2660 nc = rcu_dereference(mdev->tconn->net_conf);
2662 err = net_conf_to_skb(skb, nc, exclude_sensitive);
2665 goto nla_put_failure;
2667 nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2669 goto nla_put_failure;
2670 if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
2671 nla_put_u32(skb, T_current_state, mdev->state.i) ||
2672 nla_put_u64(skb, T_ed_uuid, mdev->ed_uuid) ||
2673 nla_put_u64(skb, T_capacity, drbd_get_capacity(mdev->this_bdev)) ||
2674 nla_put_u64(skb, T_send_cnt, mdev->send_cnt) ||
2675 nla_put_u64(skb, T_recv_cnt, mdev->recv_cnt) ||
2676 nla_put_u64(skb, T_read_cnt, mdev->read_cnt) ||
2677 nla_put_u64(skb, T_writ_cnt, mdev->writ_cnt) ||
2678 nla_put_u64(skb, T_al_writ_cnt, mdev->al_writ_cnt) ||
2679 nla_put_u64(skb, T_bm_writ_cnt, mdev->bm_writ_cnt) ||
2680 nla_put_u32(skb, T_ap_bio_cnt, atomic_read(&mdev->ap_bio_cnt)) ||
2681 nla_put_u32(skb, T_ap_pending_cnt, atomic_read(&mdev->ap_pending_cnt)) ||
2682 nla_put_u32(skb, T_rs_pending_cnt, atomic_read(&mdev->rs_pending_cnt)))
2683 goto nla_put_failure;
2688 spin_lock_irq(&mdev->ldev->md.uuid_lock);
2689 err = nla_put(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid);
2690 spin_unlock_irq(&mdev->ldev->md.uuid_lock);
2693 goto nla_put_failure;
2695 if (nla_put_u32(skb, T_disk_flags, mdev->ldev->md.flags) ||
2696 nla_put_u64(skb, T_bits_total, drbd_bm_bits(mdev)) ||
2697 nla_put_u64(skb, T_bits_oos, drbd_bm_total_weight(mdev)))
2698 goto nla_put_failure;
2699 if (C_SYNC_SOURCE <= mdev->state.conn &&
2700 C_PAUSED_SYNC_T >= mdev->state.conn) {
2701 if (nla_put_u64(skb, T_bits_rs_total, mdev->rs_total) ||
2702 nla_put_u64(skb, T_bits_rs_failed, mdev->rs_failed))
2703 goto nla_put_failure;
2708 switch(sib->sib_reason) {
2709 case SIB_SYNC_PROGRESS:
2710 case SIB_GET_STATUS_REPLY:
2712 case SIB_STATE_CHANGE:
2713 if (nla_put_u32(skb, T_prev_state, sib->os.i) ||
2714 nla_put_u32(skb, T_new_state, sib->ns.i))
2715 goto nla_put_failure;
2717 case SIB_HELPER_POST:
2718 if (nla_put_u32(skb, T_helper_exit_code,
2719 sib->helper_exit_code))
2720 goto nla_put_failure;
2722 case SIB_HELPER_PRE:
2723 if (nla_put_string(skb, T_helper, sib->helper_name))
2724 goto nla_put_failure;
2728 nla_nest_end(skb, nla);
2738 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
2740 enum drbd_ret_code retcode;
2743 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2744 if (!adm_ctx.reply_skb)
2746 if (retcode != NO_ERROR)
2749 err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.mdev, NULL);
2751 nlmsg_free(adm_ctx.reply_skb);
2755 drbd_adm_finish(info, retcode);
2759 int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
2761 struct drbd_conf *mdev;
2762 struct drbd_genlmsghdr *dh;
2763 struct drbd_tconn *pos = (struct drbd_tconn*)cb->args[0];
2764 struct drbd_tconn *tconn = NULL;
2765 struct drbd_tconn *tmp;
2766 unsigned volume = cb->args[1];
2768 /* Open coded, deferred, iteration:
2769 * list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
2770 * idr_for_each_entry(&tconn->volumes, mdev, i) {
2774 * where tconn is cb->args[0];
2775 * and i is cb->args[1];
2777 * cb->args[2] indicates if we shall loop over all resources,
2778 * or just dump all volumes of a single resource.
2780 * This may miss entries inserted after this dump started,
2781 * or entries deleted before they are reached.
2783 * We need to make sure the mdev won't disappear while
2784 * we are looking at it, and revalidate our iterators
2785 * on each iteration.
2788 /* synchronize with conn_create()/conn_destroy() */
2790 /* revalidate iterator position */
2791 list_for_each_entry_rcu(tmp, &drbd_tconns, all_tconn) {
2793 /* first iteration */
2805 mdev = idr_get_next(&tconn->volumes, &volume);
2807 /* No more volumes to dump on this tconn.
2808 * Advance tconn iterator. */
2809 pos = list_entry_rcu(tconn->all_tconn.next,
2810 struct drbd_tconn, all_tconn);
2811 /* Did we dump any volume on this tconn yet? */
2813 /* If we reached the end of the list,
2814 * or only a single resource dump was requested,
2816 if (&pos->all_tconn == &drbd_tconns || cb->args[2])
2824 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).pid,
2825 cb->nlh->nlmsg_seq, &drbd_genl_family,
2826 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
2831 /* This is a tconn without a single volume.
2832 * Suprisingly enough, it may have a network
2834 struct net_conf *nc;
2836 dh->ret_code = NO_ERROR;
2837 if (nla_put_drbd_cfg_context(skb, tconn, VOLUME_UNSPECIFIED))
2839 nc = rcu_dereference(tconn->net_conf);
2840 if (nc && net_conf_to_skb(skb, nc, 1) != 0)
2845 D_ASSERT(mdev->vnr == volume);
2846 D_ASSERT(mdev->tconn == tconn);
2848 dh->minor = mdev_to_minor(mdev);
2849 dh->ret_code = NO_ERROR;
2851 if (nla_put_status_info(skb, mdev, NULL)) {
2853 genlmsg_cancel(skb, dh);
2857 genlmsg_end(skb, dh);
2862 /* where to start the next iteration */
2863 cb->args[0] = (long)pos;
2864 cb->args[1] = (pos == tconn) ? volume + 1 : 0;
2866 /* No more tconns/volumes/minors found results in an empty skb.
2867 * Which will terminate the dump. */
2872 * Request status of all resources, or of all volumes within a single resource.
2874 * This is a dump, as the answer may not fit in a single reply skb otherwise.
2875 * Which means we cannot use the family->attrbuf or other such members, because
2876 * dump is NOT protected by the genl_lock(). During dump, we only have access
2877 * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
2879 * Once things are setup properly, we call into get_one_status().
2881 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
2883 const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
2885 const char *resource_name;
2886 struct drbd_tconn *tconn;
2889 /* Is this a followup call? */
2891 /* ... of a single resource dump,
2892 * and the resource iterator has been advanced already? */
2893 if (cb->args[2] && cb->args[2] != cb->args[0])
2894 return 0; /* DONE. */
2898 /* First call (from netlink_dump_start). We need to figure out
2899 * which resource(s) the user wants us to dump. */
2900 nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
2901 nlmsg_attrlen(cb->nlh, hdrlen),
2902 DRBD_NLA_CFG_CONTEXT);
2904 /* No explicit context given. Dump all. */
2907 maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
2908 nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
2910 return PTR_ERR(nla);
2911 /* context given, but no name present? */
2914 resource_name = nla_data(nla);
2915 tconn = conn_get_by_name(resource_name);
2920 kref_put(&tconn->kref, &conn_destroy); /* get_one_status() (re)validates tconn by itself */
2922 /* prime iterators, and set "filter" mode mark:
2923 * only dump this tconn. */
2924 cb->args[0] = (long)tconn;
2925 /* cb->args[1] = 0; passed in this way. */
2926 cb->args[2] = (long)tconn;
2929 return get_one_status(skb, cb);
2932 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
2934 enum drbd_ret_code retcode;
2935 struct timeout_parms tp;
2938 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2939 if (!adm_ctx.reply_skb)
2941 if (retcode != NO_ERROR)
2945 adm_ctx.mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2946 test_bit(USE_DEGR_WFC_T, &adm_ctx.mdev->flags) ? UT_DEGRADED :
2949 err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
2951 nlmsg_free(adm_ctx.reply_skb);
2955 drbd_adm_finish(info, retcode);
2959 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
2961 struct drbd_conf *mdev;
2962 enum drbd_ret_code retcode;
2963 struct start_ov_parms parms;
2965 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2966 if (!adm_ctx.reply_skb)
2968 if (retcode != NO_ERROR)
2971 mdev = adm_ctx.mdev;
2973 /* resume from last known position, if possible */
2974 parms.ov_start_sector = mdev->ov_start_sector;
2975 parms.ov_stop_sector = ULLONG_MAX;
2976 if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
2977 int err = start_ov_parms_from_attrs(&parms, info);
2979 retcode = ERR_MANDATORY_TAG;
2980 drbd_msg_put_info(from_attrs_err_to_txt(err));
2984 /* w_make_ov_request expects position to be aligned */
2985 mdev->ov_start_sector = parms.ov_start_sector & ~(BM_SECT_PER_BIT-1);
2986 mdev->ov_stop_sector = parms.ov_stop_sector;
2988 /* If there is still bitmap IO pending, e.g. previous resync or verify
2989 * just being finished, wait for it before requesting a new resync. */
2990 drbd_suspend_io(mdev);
2991 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2992 retcode = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2993 drbd_resume_io(mdev);
2995 drbd_adm_finish(info, retcode);
3000 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
3002 struct drbd_conf *mdev;
3003 enum drbd_ret_code retcode;
3004 int skip_initial_sync = 0;
3006 struct new_c_uuid_parms args;
3008 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3009 if (!adm_ctx.reply_skb)
3011 if (retcode != NO_ERROR)
3014 mdev = adm_ctx.mdev;
3015 memset(&args, 0, sizeof(args));
3016 if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
3017 err = new_c_uuid_parms_from_attrs(&args, info);
3019 retcode = ERR_MANDATORY_TAG;
3020 drbd_msg_put_info(from_attrs_err_to_txt(err));
3025 mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
3027 if (!get_ldev(mdev)) {
3028 retcode = ERR_NO_DISK;
3032 /* this is "skip initial sync", assume to be clean */
3033 if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
3034 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
3035 dev_info(DEV, "Preparing to skip initial sync\n");
3036 skip_initial_sync = 1;
3037 } else if (mdev->state.conn != C_STANDALONE) {
3038 retcode = ERR_CONNECTED;
3042 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
3043 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
3045 if (args.clear_bm) {
3046 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
3047 "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
3049 dev_err(DEV, "Writing bitmap failed with %d\n",err);
3050 retcode = ERR_IO_MD_DISK;
3052 if (skip_initial_sync) {
3053 drbd_send_uuids_skip_initial_sync(mdev);
3054 _drbd_uuid_set(mdev, UI_BITMAP, 0);
3055 drbd_print_uuids(mdev, "cleared bitmap UUID");
3056 spin_lock_irq(&mdev->tconn->req_lock);
3057 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3059 spin_unlock_irq(&mdev->tconn->req_lock);
3067 mutex_unlock(mdev->state_mutex);
3069 drbd_adm_finish(info, retcode);
3073 static enum drbd_ret_code
3074 drbd_check_resource_name(const char *name)
3076 if (!name || !name[0]) {
3077 drbd_msg_put_info("resource name missing");
3078 return ERR_MANDATORY_TAG;
3080 /* if we want to use these in sysfs/configfs/debugfs some day,
3081 * we must not allow slashes */
3082 if (strchr(name, '/')) {
3083 drbd_msg_put_info("invalid resource name");
3084 return ERR_INVALID_REQUEST;
3089 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
3091 enum drbd_ret_code retcode;
3092 struct res_opts res_opts;
3095 retcode = drbd_adm_prepare(skb, info, 0);
3096 if (!adm_ctx.reply_skb)
3098 if (retcode != NO_ERROR)
3101 set_res_opts_defaults(&res_opts);
3102 err = res_opts_from_attrs(&res_opts, info);
3103 if (err && err != -ENOMSG) {
3104 retcode = ERR_MANDATORY_TAG;
3105 drbd_msg_put_info(from_attrs_err_to_txt(err));
3109 retcode = drbd_check_resource_name(adm_ctx.resource_name);
3110 if (retcode != NO_ERROR)
3113 if (adm_ctx.tconn) {
3114 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
3115 retcode = ERR_INVALID_REQUEST;
3116 drbd_msg_put_info("resource exists");
3118 /* else: still NO_ERROR */
3122 if (!conn_create(adm_ctx.resource_name, &res_opts))
3123 retcode = ERR_NOMEM;
3125 drbd_adm_finish(info, retcode);
3129 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info)
3131 struct drbd_genlmsghdr *dh = info->userhdr;
3132 enum drbd_ret_code retcode;
3134 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3135 if (!adm_ctx.reply_skb)
3137 if (retcode != NO_ERROR)
3140 if (dh->minor > MINORMASK) {
3141 drbd_msg_put_info("requested minor out of range");
3142 retcode = ERR_INVALID_REQUEST;
3145 if (adm_ctx.volume > DRBD_VOLUME_MAX) {
3146 drbd_msg_put_info("requested volume id out of range");
3147 retcode = ERR_INVALID_REQUEST;
3151 /* drbd_adm_prepare made sure already
3152 * that mdev->tconn and mdev->vnr match the request. */
3154 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3155 retcode = ERR_MINOR_EXISTS;
3156 /* else: still NO_ERROR */
3160 retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume);
3162 drbd_adm_finish(info, retcode);
3166 static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
3168 if (mdev->state.disk == D_DISKLESS &&
3169 /* no need to be mdev->state.conn == C_STANDALONE &&
3170 * we may want to delete a minor from a live replication group.
3172 mdev->state.role == R_SECONDARY) {
3173 _drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS),
3174 CS_VERBOSE + CS_WAIT_COMPLETE);
3175 idr_remove(&mdev->tconn->volumes, mdev->vnr);
3176 idr_remove(&minors, mdev_to_minor(mdev));
3177 del_gendisk(mdev->vdisk);
3179 kref_put(&mdev->kref, &drbd_minor_destroy);
3182 return ERR_MINOR_CONFIGURED;
3185 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info)
3187 enum drbd_ret_code retcode;
3189 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3190 if (!adm_ctx.reply_skb)
3192 if (retcode != NO_ERROR)
3195 retcode = adm_delete_minor(adm_ctx.mdev);
3197 drbd_adm_finish(info, retcode);
3201 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3203 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
3204 struct drbd_conf *mdev;
3207 retcode = drbd_adm_prepare(skb, info, 0);
3208 if (!adm_ctx.reply_skb)
3210 if (retcode != NO_ERROR)
3213 if (!adm_ctx.tconn) {
3214 retcode = ERR_RES_NOT_KNOWN;
3219 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3220 retcode = drbd_set_role(mdev, R_SECONDARY, 0);
3221 if (retcode < SS_SUCCESS) {
3222 drbd_msg_put_info("failed to demote");
3227 retcode = conn_try_disconnect(adm_ctx.tconn, 0);
3228 if (retcode < SS_SUCCESS) {
3229 drbd_msg_put_info("failed to disconnect");
3234 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3235 retcode = adm_detach(mdev, 0);
3236 if (retcode < SS_SUCCESS || retcode > NO_ERROR) {
3237 drbd_msg_put_info("failed to detach");
3242 /* If we reach this, all volumes (of this tconn) are Secondary,
3243 * Disconnected, Diskless, aka Unconfigured. Make sure all threads have
3244 * actually stopped, state handling only does drbd_thread_stop_nowait(). */
3245 drbd_thread_stop(&adm_ctx.tconn->worker);
3247 /* Now, nothing can fail anymore */
3249 /* delete volumes */
3250 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3251 retcode = adm_delete_minor(mdev);
3252 if (retcode != NO_ERROR) {
3253 /* "can not happen" */
3254 drbd_msg_put_info("failed to delete volume");
3259 /* delete connection */
3260 if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3261 list_del_rcu(&adm_ctx.tconn->all_tconn);
3263 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3267 /* "can not happen" */
3268 retcode = ERR_RES_IN_USE;
3269 drbd_msg_put_info("failed to delete connection");
3273 drbd_adm_finish(info, retcode);
3277 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
3279 enum drbd_ret_code retcode;
3281 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3282 if (!adm_ctx.reply_skb)
3284 if (retcode != NO_ERROR)
3287 if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3288 list_del_rcu(&adm_ctx.tconn->all_tconn);
3290 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3294 retcode = ERR_RES_IN_USE;
3297 if (retcode == NO_ERROR)
3298 drbd_thread_stop(&adm_ctx.tconn->worker);
3300 drbd_adm_finish(info, retcode);
3304 void drbd_bcast_event(struct drbd_conf *mdev, const struct sib_info *sib)
3306 static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3307 struct sk_buff *msg;
3308 struct drbd_genlmsghdr *d_out;
3312 seq = atomic_inc_return(&drbd_genl_seq);
3313 msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3318 d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3319 if (!d_out) /* cannot happen, but anyways. */
3320 goto nla_put_failure;
3321 d_out->minor = mdev_to_minor(mdev);
3322 d_out->ret_code = NO_ERROR;
3324 if (nla_put_status_info(msg, mdev, sib))
3325 goto nla_put_failure;
3326 genlmsg_end(msg, d_out);
3327 err = drbd_genl_multicast_events(msg, 0);
3328 /* msg has been consumed or freed in netlink_broadcast() */
3329 if (err && err != -ESRCH)
3337 dev_err(DEV, "Error %d while broadcasting event. "
3338 "Event seq:%u sib_reason:%u\n",
3339 err, seq, sib->sib_reason);