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 };
329 snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
330 setup_khelper_env(mdev->tconn, envp);
332 /* The helper may take some time.
333 * write out any unsynced meta data changes now */
336 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
337 sib.sib_reason = SIB_HELPER_PRE;
338 sib.helper_name = cmd;
339 drbd_bcast_event(mdev, &sib);
340 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
342 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
343 usermode_helper, cmd, mb,
344 (ret >> 8) & 0xff, ret);
346 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
347 usermode_helper, cmd, mb,
348 (ret >> 8) & 0xff, ret);
349 sib.sib_reason = SIB_HELPER_POST;
350 sib.helper_exit_code = ret;
351 drbd_bcast_event(mdev, &sib);
353 if (ret < 0) /* Ignore any ERRNOs we got. */
359 static void conn_md_sync(struct drbd_tconn *tconn)
361 struct drbd_conf *mdev;
365 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
366 kref_get(&mdev->kref);
369 kref_put(&mdev->kref, &drbd_minor_destroy);
375 int conn_khelper(struct drbd_tconn *tconn, char *cmd)
377 char *envp[] = { "HOME=/",
379 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
380 (char[20]) { }, /* address family */
381 (char[60]) { }, /* address */
383 char *argv[] = {usermode_helper, cmd, tconn->name, NULL };
386 setup_khelper_env(tconn, envp);
389 conn_info(tconn, "helper command: %s %s %s\n", usermode_helper, cmd, tconn->name);
390 /* TODO: conn_bcast_event() ?? */
392 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
394 conn_warn(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
395 usermode_helper, cmd, tconn->name,
396 (ret >> 8) & 0xff, ret);
398 conn_info(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
399 usermode_helper, cmd, tconn->name,
400 (ret >> 8) & 0xff, ret);
401 /* TODO: conn_bcast_event() ?? */
403 if (ret < 0) /* Ignore any ERRNOs we got. */
409 static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
411 enum drbd_fencing_p fp = FP_NOT_AVAIL;
412 struct drbd_conf *mdev;
416 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
417 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
418 fp = max_t(enum drbd_fencing_p, fp,
419 rcu_dereference(mdev->ldev->disk_conf)->fencing);
428 bool conn_try_outdate_peer(struct drbd_tconn *tconn)
430 union drbd_state mask = { };
431 union drbd_state val = { };
432 enum drbd_fencing_p fp;
436 if (tconn->cstate >= C_WF_REPORT_PARAMS) {
437 conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");
441 fp = highest_fencing_policy(tconn);
444 conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");
451 r = conn_khelper(tconn, "fence-peer");
453 switch ((r>>8) & 0xff) {
454 case 3: /* peer is inconsistent */
455 ex_to_string = "peer is inconsistent or worse";
457 val.pdsk = D_INCONSISTENT;
459 case 4: /* peer got outdated, or was already outdated */
460 ex_to_string = "peer was fenced";
462 val.pdsk = D_OUTDATED;
464 case 5: /* peer was down */
465 if (conn_highest_disk(tconn) == D_UP_TO_DATE) {
466 /* we will(have) create(d) a new UUID anyways... */
467 ex_to_string = "peer is unreachable, assumed to be dead";
469 val.pdsk = D_OUTDATED;
471 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
474 case 6: /* Peer is primary, voluntarily outdate myself.
475 * This is useful when an unconnected R_SECONDARY is asked to
476 * become R_PRIMARY, but finds the other peer being active. */
477 ex_to_string = "peer is active";
478 conn_warn(tconn, "Peer is primary, outdating myself.\n");
480 val.disk = D_OUTDATED;
483 if (fp != FP_STONITH)
484 conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");
485 ex_to_string = "peer was stonithed";
487 val.pdsk = D_OUTDATED;
490 /* The script is broken ... */
491 conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
492 return false; /* Eventually leave IO frozen */
495 conn_info(tconn, "fence-peer helper returned %d (%s)\n",
496 (r>>8) & 0xff, ex_to_string);
501 conn_request_state(tconn, mask, val, CS_VERBOSE);
502 here, because we might were able to re-establish the connection in the
504 spin_lock_irq(&tconn->req_lock);
505 if (tconn->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &tconn->flags))
506 _conn_request_state(tconn, mask, val, CS_VERBOSE);
507 spin_unlock_irq(&tconn->req_lock);
509 return conn_highest_pdsk(tconn) <= D_OUTDATED;
512 static int _try_outdate_peer_async(void *data)
514 struct drbd_tconn *tconn = (struct drbd_tconn *)data;
516 conn_try_outdate_peer(tconn);
518 kref_put(&tconn->kref, &conn_destroy);
522 void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
524 struct task_struct *opa;
526 kref_get(&tconn->kref);
527 opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
529 conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
530 kref_put(&tconn->kref, &conn_destroy);
535 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
537 const int max_tries = 4;
538 enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
542 union drbd_state mask, val;
544 if (new_role == R_PRIMARY)
545 request_ping(mdev->tconn); /* Detect a dead peer ASAP */
547 mutex_lock(mdev->state_mutex);
549 mask.i = 0; mask.role = R_MASK;
550 val.i = 0; val.role = new_role;
552 while (try++ < max_tries) {
553 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
555 /* in case we first succeeded to outdate,
556 * but now suddenly could establish a connection */
557 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
563 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
564 (mdev->state.disk < D_UP_TO_DATE &&
565 mdev->state.disk >= D_INCONSISTENT)) {
567 val.disk = D_UP_TO_DATE;
572 if (rv == SS_NO_UP_TO_DATE_DISK &&
573 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
574 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
576 if (conn_try_outdate_peer(mdev->tconn)) {
577 val.disk = D_UP_TO_DATE;
583 if (rv == SS_NOTHING_TO_DO)
585 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
586 if (!conn_try_outdate_peer(mdev->tconn) && force) {
587 dev_warn(DEV, "Forced into split brain situation!\n");
589 val.pdsk = D_OUTDATED;
594 if (rv == SS_TWO_PRIMARIES) {
595 /* Maybe the peer is detected as dead very soon...
596 retry at most once more in this case. */
599 nc = rcu_dereference(mdev->tconn->net_conf);
600 timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
602 schedule_timeout_interruptible(timeo);
607 if (rv < SS_SUCCESS) {
608 rv = _drbd_request_state(mdev, mask, val,
609 CS_VERBOSE + CS_WAIT_COMPLETE);
620 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
622 /* Wait until nothing is on the fly :) */
623 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
625 if (new_role == R_SECONDARY) {
626 set_disk_ro(mdev->vdisk, true);
627 if (get_ldev(mdev)) {
628 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
632 mutex_lock(&mdev->tconn->conf_update);
633 nc = mdev->tconn->net_conf;
635 nc->discard_my_data = 0; /* without copy; single bit op is atomic */
636 mutex_unlock(&mdev->tconn->conf_update);
638 set_disk_ro(mdev->vdisk, false);
639 if (get_ldev(mdev)) {
640 if (((mdev->state.conn < C_CONNECTED ||
641 mdev->state.pdsk <= D_FAILED)
642 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
643 drbd_uuid_new_current(mdev);
645 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
650 /* writeout of activity log covered areas of the bitmap
651 * to stable storage done in after state change already */
653 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
654 /* if this was forced, we should consider sync */
656 drbd_send_uuids(mdev);
657 drbd_send_current_state(mdev);
662 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
664 mutex_unlock(mdev->state_mutex);
668 static const char *from_attrs_err_to_txt(int err)
670 return err == -ENOMSG ? "required attribute missing" :
671 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
672 err == -EEXIST ? "can not change invariant setting" :
673 "invalid attribute value";
676 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
678 struct set_role_parms parms;
680 enum drbd_ret_code retcode;
682 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
683 if (!adm_ctx.reply_skb)
685 if (retcode != NO_ERROR)
688 memset(&parms, 0, sizeof(parms));
689 if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
690 err = set_role_parms_from_attrs(&parms, info);
692 retcode = ERR_MANDATORY_TAG;
693 drbd_msg_put_info(from_attrs_err_to_txt(err));
698 if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
699 retcode = drbd_set_role(adm_ctx.mdev, R_PRIMARY, parms.assume_uptodate);
701 retcode = drbd_set_role(adm_ctx.mdev, R_SECONDARY, 0);
703 drbd_adm_finish(info, retcode);
707 /* initializes the md.*_offset members, so we are able to find
708 * the on disk meta data */
709 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
710 struct drbd_backing_dev *bdev)
712 sector_t md_size_sect = 0;
716 meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
718 switch (meta_dev_idx) {
720 /* v07 style fixed size indexed meta data */
721 bdev->md.md_size_sect = MD_RESERVED_SECT;
722 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
723 bdev->md.al_offset = MD_AL_OFFSET;
724 bdev->md.bm_offset = MD_BM_OFFSET;
726 case DRBD_MD_INDEX_FLEX_EXT:
727 /* just occupy the full device; unit: sectors */
728 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
729 bdev->md.md_offset = 0;
730 bdev->md.al_offset = MD_AL_OFFSET;
731 bdev->md.bm_offset = MD_BM_OFFSET;
733 case DRBD_MD_INDEX_INTERNAL:
734 case DRBD_MD_INDEX_FLEX_INT:
735 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
736 /* al size is still fixed */
737 bdev->md.al_offset = -MD_AL_SECTORS;
738 /* we need (slightly less than) ~ this much bitmap sectors: */
739 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
740 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
741 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
742 md_size_sect = ALIGN(md_size_sect, 8);
744 /* plus the "drbd meta data super block",
745 * and the activity log; */
746 md_size_sect += MD_BM_OFFSET;
748 bdev->md.md_size_sect = md_size_sect;
749 /* bitmap offset is adjusted by 'super' block size */
750 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
756 /* input size is expected to be in KB */
757 char *ppsize(char *buf, unsigned long long size)
759 /* Needs 9 bytes at max including trailing NUL:
760 * -1ULL ==> "16384 EB" */
761 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
763 while (size >= 10000 && base < sizeof(units)-1) {
765 size = (size >> 10) + !!(size & (1<<9));
768 sprintf(buf, "%u %cB", (unsigned)size, units[base]);
773 /* there is still a theoretical deadlock when called from receiver
774 * on an D_INCONSISTENT R_PRIMARY:
775 * remote READ does inc_ap_bio, receiver would need to receive answer
776 * packet from remote to dec_ap_bio again.
777 * receiver receive_sizes(), comes here,
778 * waits for ap_bio_cnt == 0. -> deadlock.
779 * but this cannot happen, actually, because:
780 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
781 * (not connected, or bad/no disk on peer):
782 * see drbd_fail_request_early, ap_bio_cnt is zero.
783 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
784 * peer may not initiate a resize.
786 /* Note these are not to be confused with
787 * drbd_adm_suspend_io/drbd_adm_resume_io,
788 * which are (sub) state changes triggered by admin (drbdsetup),
789 * and can be long lived.
790 * This changes an mdev->flag, is triggered by drbd internals,
791 * and should be short-lived. */
792 void drbd_suspend_io(struct drbd_conf *mdev)
794 set_bit(SUSPEND_IO, &mdev->flags);
795 if (drbd_suspended(mdev))
797 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
800 void drbd_resume_io(struct drbd_conf *mdev)
802 clear_bit(SUSPEND_IO, &mdev->flags);
803 wake_up(&mdev->misc_wait);
807 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
808 * @mdev: DRBD device.
810 * Returns 0 on success, negative return values indicate errors.
811 * You should call drbd_md_sync() after calling this function.
813 enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
815 sector_t prev_first_sect, prev_size; /* previous meta location */
816 sector_t la_size, u_size;
820 int md_moved, la_size_changed;
821 enum determine_dev_size rv = unchanged;
824 * application request passes inc_ap_bio,
825 * but then cannot get an AL-reference.
826 * this function later may wait on ap_bio_cnt == 0. -> deadlock.
829 * Suspend IO right here.
830 * still lock the act_log to not trigger ASSERTs there.
832 drbd_suspend_io(mdev);
834 /* no wait necessary anymore, actually we could assert that */
835 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
837 prev_first_sect = drbd_md_first_sector(mdev->ldev);
838 prev_size = mdev->ldev->md.md_size_sect;
839 la_size = mdev->ldev->md.la_size_sect;
841 /* TODO: should only be some assert here, not (re)init... */
842 drbd_md_set_sector_offsets(mdev, mdev->ldev);
845 u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
847 size = drbd_new_dev_size(mdev, mdev->ldev, u_size, flags & DDSF_FORCED);
849 if (drbd_get_capacity(mdev->this_bdev) != size ||
850 drbd_bm_capacity(mdev) != size) {
852 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
854 /* currently there is only one error: ENOMEM! */
855 size = drbd_bm_capacity(mdev)>>1;
857 dev_err(DEV, "OUT OF MEMORY! "
858 "Could not allocate bitmap!\n");
860 dev_err(DEV, "BM resizing failed. "
861 "Leaving size unchanged at size = %lu KB\n",
862 (unsigned long)size);
866 /* racy, see comments above. */
867 drbd_set_my_capacity(mdev, size);
868 mdev->ldev->md.la_size_sect = size;
869 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
870 (unsigned long long)size>>1);
872 if (rv == dev_size_error)
875 la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
877 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
878 || prev_size != mdev->ldev->md.md_size_sect;
880 if (la_size_changed || md_moved) {
883 drbd_al_shrink(mdev); /* All extents inactive. */
884 dev_info(DEV, "Writing the whole bitmap, %s\n",
885 la_size_changed && md_moved ? "size changed and md moved" :
886 la_size_changed ? "size changed" : "md moved");
887 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
888 err = drbd_bitmap_io(mdev, &drbd_bm_write,
889 "size changed", BM_LOCKED_MASK);
894 drbd_md_mark_dirty(mdev);
902 lc_unlock(mdev->act_log);
903 wake_up(&mdev->al_wait);
904 drbd_resume_io(mdev);
910 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
911 sector_t u_size, int assume_peer_has_space)
913 sector_t p_size = mdev->p_size; /* partner's disk size. */
914 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
915 sector_t m_size; /* my size */
918 m_size = drbd_get_max_capacity(bdev);
920 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
921 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
925 if (p_size && m_size) {
926 size = min_t(sector_t, p_size, m_size);
930 if (m_size && m_size < size)
932 if (p_size && p_size < size)
943 dev_err(DEV, "Both nodes diskless!\n");
947 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
948 (unsigned long)u_size>>1, (unsigned long)size>>1);
957 * drbd_check_al_size() - Ensures that the AL is of the right size
958 * @mdev: DRBD device.
960 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
961 * failed, and 0 on success. You should call drbd_md_sync() after you called
964 static int drbd_check_al_size(struct drbd_conf *mdev, struct disk_conf *dc)
966 struct lru_cache *n, *t;
967 struct lc_element *e;
972 mdev->act_log->nr_elements == dc->al_extents)
977 n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
978 dc->al_extents, sizeof(struct lc_element), 0);
981 dev_err(DEV, "Cannot allocate act_log lru!\n");
984 spin_lock_irq(&mdev->al_lock);
986 for (i = 0; i < t->nr_elements; i++) {
987 e = lc_element_by_index(t, i);
989 dev_err(DEV, "refcnt(%d)==%d\n",
990 e->lc_number, e->refcnt);
996 spin_unlock_irq(&mdev->al_lock);
998 dev_err(DEV, "Activity log still in use!\n");
1005 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
1009 static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
1011 struct request_queue * const q = mdev->rq_queue;
1012 int max_hw_sectors = max_bio_size >> 9;
1013 int max_segments = 0;
1015 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1016 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1018 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
1020 max_segments = rcu_dereference(mdev->ldev->disk_conf)->max_bio_bvecs;
1025 blk_queue_logical_block_size(q, 512);
1026 blk_queue_max_hw_sectors(q, max_hw_sectors);
1027 /* This is the workaround for "bio would need to, but cannot, be split" */
1028 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1029 blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
1031 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1032 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1034 blk_queue_stack_limits(q, b);
1036 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
1037 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
1038 q->backing_dev_info.ra_pages,
1039 b->backing_dev_info.ra_pages);
1040 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1046 void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
1048 int now, new, local, peer;
1050 now = queue_max_hw_sectors(mdev->rq_queue) << 9;
1051 local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
1052 peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
1054 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1055 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
1056 mdev->local_max_bio_size = local;
1060 /* We may ignore peer limits if the peer is modern enough.
1061 Because new from 8.3.8 onwards the peer can use multiple
1062 BIOs for a single peer_request */
1063 if (mdev->state.conn >= C_CONNECTED) {
1064 if (mdev->tconn->agreed_pro_version < 94)
1065 peer = min_t(int, mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
1066 /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
1067 else if (mdev->tconn->agreed_pro_version == 94)
1068 peer = DRBD_MAX_SIZE_H80_PACKET;
1069 else if (mdev->tconn->agreed_pro_version < 100)
1070 peer = DRBD_MAX_BIO_SIZE_P95; /* drbd 8.3.8 onwards, before 8.4.0 */
1072 peer = DRBD_MAX_BIO_SIZE;
1075 new = min_t(int, local, peer);
1077 if (mdev->state.role == R_PRIMARY && new < now)
1078 dev_err(DEV, "ASSERT FAILED new < now; (%d < %d)\n", new, now);
1081 dev_info(DEV, "max BIO size = %u\n", new);
1083 drbd_setup_queue_param(mdev, new);
1086 /* Starts the worker thread */
1087 static void conn_reconfig_start(struct drbd_tconn *tconn)
1089 drbd_thread_start(&tconn->worker);
1090 conn_flush_workqueue(tconn);
1093 /* if still unconfigured, stops worker again. */
1094 static void conn_reconfig_done(struct drbd_tconn *tconn)
1097 spin_lock_irq(&tconn->req_lock);
1098 stop_threads = conn_all_vols_unconf(tconn) &&
1099 tconn->cstate == C_STANDALONE;
1100 spin_unlock_irq(&tconn->req_lock);
1102 /* asender is implicitly stopped by receiver
1103 * in conn_disconnect() */
1104 drbd_thread_stop(&tconn->receiver);
1105 drbd_thread_stop(&tconn->worker);
1109 /* Make sure IO is suspended before calling this function(). */
1110 static void drbd_suspend_al(struct drbd_conf *mdev)
1114 if (!lc_try_lock(mdev->act_log)) {
1115 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
1119 drbd_al_shrink(mdev);
1120 spin_lock_irq(&mdev->tconn->req_lock);
1121 if (mdev->state.conn < C_CONNECTED)
1122 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
1123 spin_unlock_irq(&mdev->tconn->req_lock);
1124 lc_unlock(mdev->act_log);
1127 dev_info(DEV, "Suspended AL updates\n");
1131 static bool should_set_defaults(struct genl_info *info)
1133 unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1134 return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1137 static void enforce_disk_conf_limits(struct disk_conf *dc)
1139 if (dc->al_extents < DRBD_AL_EXTENTS_MIN)
1140 dc->al_extents = DRBD_AL_EXTENTS_MIN;
1141 if (dc->al_extents > DRBD_AL_EXTENTS_MAX)
1142 dc->al_extents = DRBD_AL_EXTENTS_MAX;
1144 if (dc->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1145 dc->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1148 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1150 enum drbd_ret_code retcode;
1151 struct drbd_conf *mdev;
1152 struct disk_conf *new_disk_conf, *old_disk_conf;
1153 struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
1156 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1157 if (!adm_ctx.reply_skb)
1159 if (retcode != NO_ERROR)
1162 mdev = adm_ctx.mdev;
1164 /* we also need a disk
1165 * to change the options on */
1166 if (!get_ldev(mdev)) {
1167 retcode = ERR_NO_DISK;
1171 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
1172 if (!new_disk_conf) {
1173 retcode = ERR_NOMEM;
1177 mutex_lock(&mdev->tconn->conf_update);
1178 old_disk_conf = mdev->ldev->disk_conf;
1179 *new_disk_conf = *old_disk_conf;
1180 if (should_set_defaults(info))
1181 set_disk_conf_defaults(new_disk_conf);
1183 err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1184 if (err && err != -ENOMSG) {
1185 retcode = ERR_MANDATORY_TAG;
1186 drbd_msg_put_info(from_attrs_err_to_txt(err));
1189 if (!expect(new_disk_conf->resync_rate >= 1))
1190 new_disk_conf->resync_rate = 1;
1192 enforce_disk_conf_limits(new_disk_conf);
1194 fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1195 if (fifo_size != mdev->rs_plan_s->size) {
1196 new_plan = fifo_alloc(fifo_size);
1198 dev_err(DEV, "kmalloc of fifo_buffer failed");
1199 retcode = ERR_NOMEM;
1204 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1205 drbd_al_shrink(mdev);
1206 err = drbd_check_al_size(mdev, new_disk_conf);
1207 lc_unlock(mdev->act_log);
1208 wake_up(&mdev->al_wait);
1211 retcode = ERR_NOMEM;
1215 write_lock_irq(&global_state_lock);
1216 retcode = drbd_resync_after_valid(mdev, new_disk_conf->resync_after);
1217 if (retcode == NO_ERROR) {
1218 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
1219 drbd_resync_after_changed(mdev);
1221 write_unlock_irq(&global_state_lock);
1223 if (retcode != NO_ERROR)
1227 old_plan = mdev->rs_plan_s;
1228 rcu_assign_pointer(mdev->rs_plan_s, new_plan);
1231 mutex_unlock(&mdev->tconn->conf_update);
1233 if (new_disk_conf->al_updates)
1234 mdev->ldev->md.flags &= MDF_AL_DISABLED;
1236 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1238 drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1242 if (mdev->state.conn >= C_CONNECTED)
1243 drbd_send_sync_param(mdev);
1246 kfree(old_disk_conf);
1248 mod_timer(&mdev->request_timer, jiffies + HZ);
1252 mutex_unlock(&mdev->tconn->conf_update);
1254 kfree(new_disk_conf);
1259 drbd_adm_finish(info, retcode);
1263 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1265 struct drbd_conf *mdev;
1267 enum drbd_ret_code retcode;
1268 enum determine_dev_size dd;
1269 sector_t max_possible_sectors;
1270 sector_t min_md_device_sectors;
1271 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1272 struct disk_conf *new_disk_conf = NULL;
1273 struct block_device *bdev;
1274 struct lru_cache *resync_lru = NULL;
1275 struct fifo_buffer *new_plan = NULL;
1276 union drbd_state ns, os;
1277 enum drbd_state_rv rv;
1278 struct net_conf *nc;
1280 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1281 if (!adm_ctx.reply_skb)
1283 if (retcode != NO_ERROR)
1286 mdev = adm_ctx.mdev;
1287 conn_reconfig_start(mdev->tconn);
1289 /* if you want to reconfigure, please tear down first */
1290 if (mdev->state.disk > D_DISKLESS) {
1291 retcode = ERR_DISK_CONFIGURED;
1294 /* It may just now have detached because of IO error. Make sure
1295 * drbd_ldev_destroy is done already, we may end up here very fast,
1296 * e.g. if someone calls attach from the on-io-error handler,
1297 * to realize a "hot spare" feature (not that I'd recommend that) */
1298 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1300 /* allocation not in the IO path, drbdsetup context */
1301 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1303 retcode = ERR_NOMEM;
1306 new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1307 if (!new_disk_conf) {
1308 retcode = ERR_NOMEM;
1311 nbc->disk_conf = new_disk_conf;
1313 set_disk_conf_defaults(new_disk_conf);
1314 err = disk_conf_from_attrs(new_disk_conf, info);
1316 retcode = ERR_MANDATORY_TAG;
1317 drbd_msg_put_info(from_attrs_err_to_txt(err));
1321 enforce_disk_conf_limits(new_disk_conf);
1323 new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1325 retcode = ERR_NOMEM;
1329 if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1330 retcode = ERR_MD_IDX_INVALID;
1335 nc = rcu_dereference(mdev->tconn->net_conf);
1337 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1339 retcode = ERR_STONITH_AND_PROT_A;
1345 bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
1346 FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
1348 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
1350 retcode = ERR_OPEN_DISK;
1353 nbc->backing_bdev = bdev;
1356 * meta_dev_idx >= 0: external fixed size, possibly multiple
1357 * drbd sharing one meta device. TODO in that case, paranoia
1358 * check that [md_bdev, meta_dev_idx] is not yet used by some
1359 * other drbd minor! (if you use drbd.conf + drbdadm, that
1360 * should check it for you already; but if you don't, or
1361 * someone fooled it, we need to double check here)
1363 bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
1364 FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1365 (new_disk_conf->meta_dev_idx < 0) ?
1366 (void *)mdev : (void *)drbd_m_holder);
1368 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
1370 retcode = ERR_OPEN_MD_DISK;
1373 nbc->md_bdev = bdev;
1375 if ((nbc->backing_bdev == nbc->md_bdev) !=
1376 (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1377 new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1378 retcode = ERR_MD_IDX_INVALID;
1382 resync_lru = lc_create("resync", drbd_bm_ext_cache,
1383 1, 61, sizeof(struct bm_extent),
1384 offsetof(struct bm_extent, lce));
1386 retcode = ERR_NOMEM;
1390 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1391 drbd_md_set_sector_offsets(mdev, nbc);
1393 if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
1394 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1395 (unsigned long long) drbd_get_max_capacity(nbc),
1396 (unsigned long long) new_disk_conf->disk_size);
1397 retcode = ERR_DISK_TOO_SMALL;
1401 if (new_disk_conf->meta_dev_idx < 0) {
1402 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1403 /* at least one MB, otherwise it does not make sense */
1404 min_md_device_sectors = (2<<10);
1406 max_possible_sectors = DRBD_MAX_SECTORS;
1407 min_md_device_sectors = MD_RESERVED_SECT * (new_disk_conf->meta_dev_idx + 1);
1410 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1411 retcode = ERR_MD_DISK_TOO_SMALL;
1412 dev_warn(DEV, "refusing attach: md-device too small, "
1413 "at least %llu sectors needed for this meta-disk type\n",
1414 (unsigned long long) min_md_device_sectors);
1418 /* Make sure the new disk is big enough
1419 * (we may currently be R_PRIMARY with no local disk...) */
1420 if (drbd_get_max_capacity(nbc) <
1421 drbd_get_capacity(mdev->this_bdev)) {
1422 retcode = ERR_DISK_TOO_SMALL;
1426 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1428 if (nbc->known_size > max_possible_sectors) {
1429 dev_warn(DEV, "==> truncating very big lower level device "
1430 "to currently maximum possible %llu sectors <==\n",
1431 (unsigned long long) max_possible_sectors);
1432 if (new_disk_conf->meta_dev_idx >= 0)
1433 dev_warn(DEV, "==>> using internal or flexible "
1434 "meta data may help <<==\n");
1437 drbd_suspend_io(mdev);
1438 /* also wait for the last barrier ack. */
1439 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || drbd_suspended(mdev));
1440 /* and for any other previously queued work */
1441 drbd_flush_workqueue(mdev);
1443 rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1444 retcode = rv; /* FIXME: Type mismatch. */
1445 drbd_resume_io(mdev);
1446 if (rv < SS_SUCCESS)
1449 if (!get_ldev_if_state(mdev, D_ATTACHING))
1450 goto force_diskless;
1452 drbd_md_set_sector_offsets(mdev, nbc);
1454 if (!mdev->bitmap) {
1455 if (drbd_bm_init(mdev)) {
1456 retcode = ERR_NOMEM;
1457 goto force_diskless_dec;
1461 retcode = drbd_md_read(mdev, nbc);
1462 if (retcode != NO_ERROR)
1463 goto force_diskless_dec;
1465 if (mdev->state.conn < C_CONNECTED &&
1466 mdev->state.role == R_PRIMARY &&
1467 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1468 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1469 (unsigned long long)mdev->ed_uuid);
1470 retcode = ERR_DATA_NOT_CURRENT;
1471 goto force_diskless_dec;
1474 /* Since we are diskless, fix the activity log first... */
1475 if (drbd_check_al_size(mdev, new_disk_conf)) {
1476 retcode = ERR_NOMEM;
1477 goto force_diskless_dec;
1480 /* Prevent shrinking of consistent devices ! */
1481 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1482 drbd_new_dev_size(mdev, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
1483 dev_warn(DEV, "refusing to truncate a consistent device\n");
1484 retcode = ERR_DISK_TOO_SMALL;
1485 goto force_diskless_dec;
1488 /* Reset the "barriers don't work" bits here, then force meta data to
1489 * be written, to ensure we determine if barriers are supported. */
1490 if (new_disk_conf->md_flushes)
1491 clear_bit(MD_NO_FUA, &mdev->flags);
1493 set_bit(MD_NO_FUA, &mdev->flags);
1495 /* Point of no return reached.
1496 * Devices and memory are no longer released by error cleanup below.
1497 * now mdev takes over responsibility, and the state engine should
1498 * clean it up somewhere. */
1499 D_ASSERT(mdev->ldev == NULL);
1501 mdev->resync = resync_lru;
1502 mdev->rs_plan_s = new_plan;
1505 new_disk_conf = NULL;
1508 drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1510 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1511 set_bit(CRASHED_PRIMARY, &mdev->flags);
1513 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1515 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1516 !(mdev->state.role == R_PRIMARY && mdev->tconn->susp_nod))
1517 set_bit(CRASHED_PRIMARY, &mdev->flags);
1524 drbd_reconsider_max_bio_size(mdev);
1526 /* If I am currently not R_PRIMARY,
1527 * but meta data primary indicator is set,
1528 * I just now recover from a hard crash,
1529 * and have been R_PRIMARY before that crash.
1531 * Now, if I had no connection before that crash
1532 * (have been degraded R_PRIMARY), chances are that
1533 * I won't find my peer now either.
1535 * In that case, and _only_ in that case,
1536 * we use the degr-wfc-timeout instead of the default,
1537 * so we can automatically recover from a crash of a
1538 * degraded but active "cluster" after a certain timeout.
1540 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1541 if (mdev->state.role != R_PRIMARY &&
1542 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1543 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1544 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1546 dd = drbd_determine_dev_size(mdev, 0);
1547 if (dd == dev_size_error) {
1548 retcode = ERR_NOMEM_BITMAP;
1549 goto force_diskless_dec;
1550 } else if (dd == grew)
1551 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1553 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC) ||
1554 (test_bit(CRASHED_PRIMARY, &mdev->flags) &&
1555 drbd_md_test_flag(mdev->ldev, MDF_AL_DISABLED))) {
1556 dev_info(DEV, "Assuming that all blocks are out of sync "
1557 "(aka FullSync)\n");
1558 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1559 "set_n_write from attaching", BM_LOCKED_MASK)) {
1560 retcode = ERR_IO_MD_DISK;
1561 goto force_diskless_dec;
1564 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1565 "read from attaching", BM_LOCKED_MASK)) {
1566 retcode = ERR_IO_MD_DISK;
1567 goto force_diskless_dec;
1571 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1572 drbd_suspend_al(mdev); /* IO is still suspended here... */
1574 spin_lock_irq(&mdev->tconn->req_lock);
1575 os = drbd_read_state(mdev);
1577 /* If MDF_CONSISTENT is not set go into inconsistent state,
1578 otherwise investigate MDF_WasUpToDate...
1579 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1580 otherwise into D_CONSISTENT state.
1582 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1583 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1584 ns.disk = D_CONSISTENT;
1586 ns.disk = D_OUTDATED;
1588 ns.disk = D_INCONSISTENT;
1591 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1592 ns.pdsk = D_OUTDATED;
1595 if (ns.disk == D_CONSISTENT &&
1596 (ns.pdsk == D_OUTDATED || rcu_dereference(mdev->ldev->disk_conf)->fencing == FP_DONT_CARE))
1597 ns.disk = D_UP_TO_DATE;
1599 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1600 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1601 this point, because drbd_request_state() modifies these
1604 if (rcu_dereference(mdev->ldev->disk_conf)->al_updates)
1605 mdev->ldev->md.flags &= MDF_AL_DISABLED;
1607 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1611 /* In case we are C_CONNECTED postpone any decision on the new disk
1612 state after the negotiation phase. */
1613 if (mdev->state.conn == C_CONNECTED) {
1614 mdev->new_state_tmp.i = ns.i;
1616 ns.disk = D_NEGOTIATING;
1618 /* We expect to receive up-to-date UUIDs soon.
1619 To avoid a race in receive_state, free p_uuid while
1620 holding req_lock. I.e. atomic with the state change */
1621 kfree(mdev->p_uuid);
1622 mdev->p_uuid = NULL;
1625 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1626 spin_unlock_irq(&mdev->tconn->req_lock);
1628 if (rv < SS_SUCCESS)
1629 goto force_diskless_dec;
1631 mod_timer(&mdev->request_timer, jiffies + HZ);
1633 if (mdev->state.role == R_PRIMARY)
1634 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1636 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1638 drbd_md_mark_dirty(mdev);
1641 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1643 conn_reconfig_done(mdev->tconn);
1644 drbd_adm_finish(info, retcode);
1650 drbd_force_state(mdev, NS(disk, D_DISKLESS));
1653 conn_reconfig_done(mdev->tconn);
1655 if (nbc->backing_bdev)
1656 blkdev_put(nbc->backing_bdev,
1657 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1659 blkdev_put(nbc->md_bdev,
1660 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1663 kfree(new_disk_conf);
1664 lc_destroy(resync_lru);
1668 drbd_adm_finish(info, retcode);
1672 static int adm_detach(struct drbd_conf *mdev, int force)
1674 enum drbd_state_rv retcode;
1678 drbd_force_state(mdev, NS(disk, D_FAILED));
1679 retcode = SS_SUCCESS;
1683 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1684 drbd_md_get_buffer(mdev); /* make sure there is no in-flight meta-data IO */
1685 retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1686 drbd_md_put_buffer(mdev);
1687 /* D_FAILED will transition to DISKLESS. */
1688 ret = wait_event_interruptible(mdev->misc_wait,
1689 mdev->state.disk != D_FAILED);
1690 drbd_resume_io(mdev);
1691 if ((int)retcode == (int)SS_IS_DISKLESS)
1692 retcode = SS_NOTHING_TO_DO;
1699 /* Detaching the disk is a process in multiple stages. First we need to lock
1700 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1701 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1702 * internal references as well.
1703 * Only then we have finally detached. */
1704 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
1706 enum drbd_ret_code retcode;
1707 struct detach_parms parms = { };
1710 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1711 if (!adm_ctx.reply_skb)
1713 if (retcode != NO_ERROR)
1716 if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
1717 err = detach_parms_from_attrs(&parms, info);
1719 retcode = ERR_MANDATORY_TAG;
1720 drbd_msg_put_info(from_attrs_err_to_txt(err));
1725 retcode = adm_detach(adm_ctx.mdev, parms.force_detach);
1727 drbd_adm_finish(info, retcode);
1731 static bool conn_resync_running(struct drbd_tconn *tconn)
1733 struct drbd_conf *mdev;
1738 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1739 if (mdev->state.conn == C_SYNC_SOURCE ||
1740 mdev->state.conn == C_SYNC_TARGET ||
1741 mdev->state.conn == C_PAUSED_SYNC_S ||
1742 mdev->state.conn == C_PAUSED_SYNC_T) {
1752 static bool conn_ov_running(struct drbd_tconn *tconn)
1754 struct drbd_conf *mdev;
1759 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1760 if (mdev->state.conn == C_VERIFY_S ||
1761 mdev->state.conn == C_VERIFY_T) {
1771 static enum drbd_ret_code
1772 _check_net_options(struct drbd_tconn *tconn, struct net_conf *old_conf, struct net_conf *new_conf)
1774 struct drbd_conf *mdev;
1777 if (old_conf && tconn->cstate == C_WF_REPORT_PARAMS && tconn->agreed_pro_version < 100) {
1778 if (new_conf->wire_protocol != old_conf->wire_protocol)
1779 return ERR_NEED_APV_100;
1781 if (new_conf->two_primaries != old_conf->two_primaries)
1782 return ERR_NEED_APV_100;
1784 if (!new_conf->integrity_alg != !old_conf->integrity_alg)
1785 return ERR_NEED_APV_100;
1787 if (strcmp(new_conf->integrity_alg, old_conf->integrity_alg))
1788 return ERR_NEED_APV_100;
1791 if (!new_conf->two_primaries &&
1792 conn_highest_role(tconn) == R_PRIMARY &&
1793 conn_highest_peer(tconn) == R_PRIMARY)
1794 return ERR_NEED_ALLOW_TWO_PRI;
1796 if (new_conf->two_primaries &&
1797 (new_conf->wire_protocol != DRBD_PROT_C))
1798 return ERR_NOT_PROTO_C;
1800 idr_for_each_entry(&tconn->volumes, mdev, i) {
1801 if (get_ldev(mdev)) {
1802 enum drbd_fencing_p fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
1804 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
1805 return ERR_STONITH_AND_PROT_A;
1807 if (mdev->state.role == R_PRIMARY && new_conf->discard_my_data)
1811 if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A)
1812 return ERR_CONG_NOT_PROTO_A;
1817 static enum drbd_ret_code
1818 check_net_options(struct drbd_tconn *tconn, struct net_conf *new_conf)
1820 static enum drbd_ret_code rv;
1821 struct drbd_conf *mdev;
1825 rv = _check_net_options(tconn, rcu_dereference(tconn->net_conf), new_conf);
1828 /* tconn->volumes protected by genl_lock() here */
1829 idr_for_each_entry(&tconn->volumes, mdev, i) {
1830 if (!mdev->bitmap) {
1831 if(drbd_bm_init(mdev))
1840 struct crypto_hash *verify_tfm;
1841 struct crypto_hash *csums_tfm;
1842 struct crypto_hash *cram_hmac_tfm;
1843 struct crypto_hash *integrity_tfm;
1847 alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
1852 *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
1861 static enum drbd_ret_code
1862 alloc_crypto(struct crypto *crypto, struct net_conf *new_conf)
1864 char hmac_name[CRYPTO_MAX_ALG_NAME];
1865 enum drbd_ret_code rv;
1867 rv = alloc_hash(&crypto->csums_tfm, new_conf->csums_alg,
1871 rv = alloc_hash(&crypto->verify_tfm, new_conf->verify_alg,
1875 rv = alloc_hash(&crypto->integrity_tfm, new_conf->integrity_alg,
1879 if (new_conf->cram_hmac_alg[0] != 0) {
1880 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1881 new_conf->cram_hmac_alg);
1883 rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
1890 static void free_crypto(struct crypto *crypto)
1892 crypto_free_hash(crypto->cram_hmac_tfm);
1893 crypto_free_hash(crypto->integrity_tfm);
1894 crypto_free_hash(crypto->csums_tfm);
1895 crypto_free_hash(crypto->verify_tfm);
1898 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
1900 enum drbd_ret_code retcode;
1901 struct drbd_tconn *tconn;
1902 struct net_conf *old_conf, *new_conf = NULL;
1904 int ovr; /* online verify running */
1905 int rsr; /* re-sync running */
1906 struct crypto crypto = { };
1908 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
1909 if (!adm_ctx.reply_skb)
1911 if (retcode != NO_ERROR)
1914 tconn = adm_ctx.tconn;
1916 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1918 retcode = ERR_NOMEM;
1922 conn_reconfig_start(tconn);
1924 mutex_lock(&tconn->data.mutex);
1925 mutex_lock(&tconn->conf_update);
1926 old_conf = tconn->net_conf;
1929 drbd_msg_put_info("net conf missing, try connect");
1930 retcode = ERR_INVALID_REQUEST;
1934 *new_conf = *old_conf;
1935 if (should_set_defaults(info))
1936 set_net_conf_defaults(new_conf);
1938 err = net_conf_from_attrs_for_change(new_conf, info);
1939 if (err && err != -ENOMSG) {
1940 retcode = ERR_MANDATORY_TAG;
1941 drbd_msg_put_info(from_attrs_err_to_txt(err));
1945 retcode = check_net_options(tconn, new_conf);
1946 if (retcode != NO_ERROR)
1949 /* re-sync running */
1950 rsr = conn_resync_running(tconn);
1951 if (rsr && strcmp(new_conf->csums_alg, old_conf->csums_alg)) {
1952 retcode = ERR_CSUMS_RESYNC_RUNNING;
1956 /* online verify running */
1957 ovr = conn_ov_running(tconn);
1958 if (ovr && strcmp(new_conf->verify_alg, old_conf->verify_alg)) {
1959 retcode = ERR_VERIFY_RUNNING;
1963 retcode = alloc_crypto(&crypto, new_conf);
1964 if (retcode != NO_ERROR)
1967 rcu_assign_pointer(tconn->net_conf, new_conf);
1970 crypto_free_hash(tconn->csums_tfm);
1971 tconn->csums_tfm = crypto.csums_tfm;
1972 crypto.csums_tfm = NULL;
1975 crypto_free_hash(tconn->verify_tfm);
1976 tconn->verify_tfm = crypto.verify_tfm;
1977 crypto.verify_tfm = NULL;
1980 crypto_free_hash(tconn->integrity_tfm);
1981 tconn->integrity_tfm = crypto.integrity_tfm;
1982 if (tconn->cstate >= C_WF_REPORT_PARAMS && tconn->agreed_pro_version >= 100)
1983 /* Do this without trying to take tconn->data.mutex again. */
1984 __drbd_send_protocol(tconn, P_PROTOCOL_UPDATE);
1986 crypto_free_hash(tconn->cram_hmac_tfm);
1987 tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
1989 mutex_unlock(&tconn->conf_update);
1990 mutex_unlock(&tconn->data.mutex);
1994 if (tconn->cstate >= C_WF_REPORT_PARAMS)
1995 drbd_send_sync_param(minor_to_mdev(conn_lowest_minor(tconn)));
2000 mutex_unlock(&tconn->conf_update);
2001 mutex_unlock(&tconn->data.mutex);
2002 free_crypto(&crypto);
2005 conn_reconfig_done(tconn);
2007 drbd_adm_finish(info, retcode);
2011 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
2013 struct drbd_conf *mdev;
2014 struct net_conf *old_conf, *new_conf = NULL;
2015 struct crypto crypto = { };
2016 struct drbd_tconn *tconn;
2017 enum drbd_ret_code retcode;
2021 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2023 if (!adm_ctx.reply_skb)
2025 if (retcode != NO_ERROR)
2027 if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
2028 drbd_msg_put_info("connection endpoint(s) missing");
2029 retcode = ERR_INVALID_REQUEST;
2033 /* No need for _rcu here. All reconfiguration is
2034 * strictly serialized on genl_lock(). We are protected against
2035 * concurrent reconfiguration/addition/deletion */
2036 list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
2037 if (nla_len(adm_ctx.my_addr) == tconn->my_addr_len &&
2038 !memcmp(nla_data(adm_ctx.my_addr), &tconn->my_addr, tconn->my_addr_len)) {
2039 retcode = ERR_LOCAL_ADDR;
2043 if (nla_len(adm_ctx.peer_addr) == tconn->peer_addr_len &&
2044 !memcmp(nla_data(adm_ctx.peer_addr), &tconn->peer_addr, tconn->peer_addr_len)) {
2045 retcode = ERR_PEER_ADDR;
2050 tconn = adm_ctx.tconn;
2051 conn_reconfig_start(tconn);
2053 if (tconn->cstate > C_STANDALONE) {
2054 retcode = ERR_NET_CONFIGURED;
2058 /* allocation not in the IO path, drbdsetup / netlink process context */
2059 new_conf = kzalloc(sizeof(*new_conf), GFP_KERNEL);
2061 retcode = ERR_NOMEM;
2065 set_net_conf_defaults(new_conf);
2067 err = net_conf_from_attrs(new_conf, info);
2068 if (err && err != -ENOMSG) {
2069 retcode = ERR_MANDATORY_TAG;
2070 drbd_msg_put_info(from_attrs_err_to_txt(err));
2074 retcode = check_net_options(tconn, new_conf);
2075 if (retcode != NO_ERROR)
2078 retcode = alloc_crypto(&crypto, new_conf);
2079 if (retcode != NO_ERROR)
2082 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2084 conn_flush_workqueue(tconn);
2086 mutex_lock(&tconn->conf_update);
2087 old_conf = tconn->net_conf;
2089 retcode = ERR_NET_CONFIGURED;
2090 mutex_unlock(&tconn->conf_update);
2093 rcu_assign_pointer(tconn->net_conf, new_conf);
2095 conn_free_crypto(tconn);
2096 tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2097 tconn->integrity_tfm = crypto.integrity_tfm;
2098 tconn->csums_tfm = crypto.csums_tfm;
2099 tconn->verify_tfm = crypto.verify_tfm;
2101 tconn->my_addr_len = nla_len(adm_ctx.my_addr);
2102 memcpy(&tconn->my_addr, nla_data(adm_ctx.my_addr), tconn->my_addr_len);
2103 tconn->peer_addr_len = nla_len(adm_ctx.peer_addr);
2104 memcpy(&tconn->peer_addr, nla_data(adm_ctx.peer_addr), tconn->peer_addr_len);
2106 mutex_unlock(&tconn->conf_update);
2109 idr_for_each_entry(&tconn->volumes, mdev, i) {
2115 retcode = conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2117 conn_reconfig_done(tconn);
2118 drbd_adm_finish(info, retcode);
2122 free_crypto(&crypto);
2125 conn_reconfig_done(tconn);
2127 drbd_adm_finish(info, retcode);
2131 static enum drbd_state_rv conn_try_disconnect(struct drbd_tconn *tconn, bool force)
2133 enum drbd_state_rv rv;
2135 rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2136 force ? CS_HARD : 0);
2139 case SS_NOTHING_TO_DO:
2141 case SS_ALREADY_STANDALONE:
2143 case SS_PRIMARY_NOP:
2144 /* Our state checking code wants to see the peer outdated. */
2145 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2146 pdsk, D_OUTDATED), CS_VERBOSE);
2148 case SS_CW_FAILED_BY_PEER:
2149 /* The peer probably wants to see us outdated. */
2150 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2151 disk, D_OUTDATED), 0);
2152 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2153 rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2158 /* no special handling necessary */
2161 if (rv >= SS_SUCCESS) {
2162 enum drbd_state_rv rv2;
2163 /* No one else can reconfigure the network while I am here.
2164 * The state handling only uses drbd_thread_stop_nowait(),
2165 * we want to really wait here until the receiver is no more.
2167 drbd_thread_stop(&adm_ctx.tconn->receiver);
2169 /* Race breaker. This additional state change request may be
2170 * necessary, if this was a forced disconnect during a receiver
2171 * restart. We may have "killed" the receiver thread just
2172 * after drbdd_init() returned. Typically, we should be
2173 * C_STANDALONE already, now, and this becomes a no-op.
2175 rv2 = conn_request_state(tconn, NS(conn, C_STANDALONE),
2176 CS_VERBOSE | CS_HARD);
2177 if (rv2 < SS_SUCCESS)
2179 "unexpected rv2=%d in conn_try_disconnect()\n",
2185 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2187 struct disconnect_parms parms;
2188 struct drbd_tconn *tconn;
2189 enum drbd_state_rv rv;
2190 enum drbd_ret_code retcode;
2193 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
2194 if (!adm_ctx.reply_skb)
2196 if (retcode != NO_ERROR)
2199 tconn = adm_ctx.tconn;
2200 memset(&parms, 0, sizeof(parms));
2201 if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2202 err = disconnect_parms_from_attrs(&parms, info);
2204 retcode = ERR_MANDATORY_TAG;
2205 drbd_msg_put_info(from_attrs_err_to_txt(err));
2210 rv = conn_try_disconnect(tconn, parms.force_disconnect);
2211 if (rv < SS_SUCCESS)
2212 retcode = rv; /* FIXME: Type mismatch. */
2216 drbd_adm_finish(info, retcode);
2220 void resync_after_online_grow(struct drbd_conf *mdev)
2222 int iass; /* I am sync source */
2224 dev_info(DEV, "Resync of new storage after online grow\n");
2225 if (mdev->state.role != mdev->state.peer)
2226 iass = (mdev->state.role == R_PRIMARY);
2228 iass = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags);
2231 drbd_start_resync(mdev, C_SYNC_SOURCE);
2233 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2236 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2238 struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
2239 struct resize_parms rs;
2240 struct drbd_conf *mdev;
2241 enum drbd_ret_code retcode;
2242 enum determine_dev_size dd;
2243 enum dds_flags ddsf;
2247 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2248 if (!adm_ctx.reply_skb)
2250 if (retcode != NO_ERROR)
2253 memset(&rs, 0, sizeof(struct resize_parms));
2254 if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2255 err = resize_parms_from_attrs(&rs, info);
2257 retcode = ERR_MANDATORY_TAG;
2258 drbd_msg_put_info(from_attrs_err_to_txt(err));
2263 mdev = adm_ctx.mdev;
2264 if (mdev->state.conn > C_CONNECTED) {
2265 retcode = ERR_RESIZE_RESYNC;
2269 if (mdev->state.role == R_SECONDARY &&
2270 mdev->state.peer == R_SECONDARY) {
2271 retcode = ERR_NO_PRIMARY;
2275 if (!get_ldev(mdev)) {
2276 retcode = ERR_NO_DISK;
2280 if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
2281 retcode = ERR_NEED_APV_93;
2286 u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
2288 if (u_size != (sector_t)rs.resize_size) {
2289 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2290 if (!new_disk_conf) {
2291 retcode = ERR_NOMEM;
2296 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
2297 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
2299 if (new_disk_conf) {
2300 mutex_lock(&mdev->tconn->conf_update);
2301 old_disk_conf = mdev->ldev->disk_conf;
2302 *new_disk_conf = *old_disk_conf;
2303 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2304 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
2305 mutex_unlock(&mdev->tconn->conf_update);
2307 kfree(old_disk_conf);
2310 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2311 dd = drbd_determine_dev_size(mdev, ddsf);
2314 if (dd == dev_size_error) {
2315 retcode = ERR_NOMEM_BITMAP;
2319 if (mdev->state.conn == C_CONNECTED) {
2321 set_bit(RESIZE_PENDING, &mdev->flags);
2323 drbd_send_uuids(mdev);
2324 drbd_send_sizes(mdev, 1, ddsf);
2328 drbd_adm_finish(info, retcode);
2336 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2338 enum drbd_ret_code retcode;
2339 struct drbd_tconn *tconn;
2340 struct res_opts res_opts;
2343 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2344 if (!adm_ctx.reply_skb)
2346 if (retcode != NO_ERROR)
2348 tconn = adm_ctx.tconn;
2350 res_opts = tconn->res_opts;
2351 if (should_set_defaults(info))
2352 set_res_opts_defaults(&res_opts);
2354 err = res_opts_from_attrs(&res_opts, info);
2355 if (err && err != -ENOMSG) {
2356 retcode = ERR_MANDATORY_TAG;
2357 drbd_msg_put_info(from_attrs_err_to_txt(err));
2361 err = set_resource_options(tconn, &res_opts);
2363 retcode = ERR_INVALID_REQUEST;
2365 retcode = ERR_NOMEM;
2369 drbd_adm_finish(info, retcode);
2373 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2375 struct drbd_conf *mdev;
2376 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2378 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2379 if (!adm_ctx.reply_skb)
2381 if (retcode != NO_ERROR)
2384 mdev = adm_ctx.mdev;
2386 /* If there is still bitmap IO pending, probably because of a previous
2387 * resync just being finished, wait for it before requesting a new resync. */
2388 drbd_suspend_io(mdev);
2389 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2391 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
2393 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
2394 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2396 while (retcode == SS_NEED_CONNECTION) {
2397 spin_lock_irq(&mdev->tconn->req_lock);
2398 if (mdev->state.conn < C_CONNECTED)
2399 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
2400 spin_unlock_irq(&mdev->tconn->req_lock);
2402 if (retcode != SS_NEED_CONNECTION)
2405 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2407 drbd_resume_io(mdev);
2410 drbd_adm_finish(info, retcode);
2414 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2415 union drbd_state mask, union drbd_state val)
2417 enum drbd_ret_code retcode;
2419 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2420 if (!adm_ctx.reply_skb)
2422 if (retcode != NO_ERROR)
2425 retcode = drbd_request_state(adm_ctx.mdev, mask, val);
2427 drbd_adm_finish(info, retcode);
2431 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
2435 rv = drbd_bmio_set_n_write(mdev);
2436 drbd_suspend_al(mdev);
2440 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
2442 int retcode; /* drbd_ret_code, drbd_state_rv */
2443 struct drbd_conf *mdev;
2445 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2446 if (!adm_ctx.reply_skb)
2448 if (retcode != NO_ERROR)
2451 mdev = adm_ctx.mdev;
2453 /* If there is still bitmap IO pending, probably because of a previous
2454 * resync just being finished, wait for it before requesting a new resync. */
2455 drbd_suspend_io(mdev);
2456 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2458 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
2459 if (retcode < SS_SUCCESS) {
2460 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
2461 /* The peer will get a resync upon connect anyways.
2462 * Just make that into a full resync. */
2463 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
2464 if (retcode >= SS_SUCCESS) {
2465 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
2466 "set_n_write from invalidate_peer",
2467 BM_LOCKED_SET_ALLOWED))
2468 retcode = ERR_IO_MD_DISK;
2471 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
2473 drbd_resume_io(mdev);
2476 drbd_adm_finish(info, retcode);
2480 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2482 enum drbd_ret_code retcode;
2484 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2485 if (!adm_ctx.reply_skb)
2487 if (retcode != NO_ERROR)
2490 if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2491 retcode = ERR_PAUSE_IS_SET;
2493 drbd_adm_finish(info, retcode);
2497 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
2499 union drbd_dev_state s;
2500 enum drbd_ret_code retcode;
2502 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2503 if (!adm_ctx.reply_skb)
2505 if (retcode != NO_ERROR)
2508 if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2509 s = adm_ctx.mdev->state;
2510 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2511 retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2512 s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2514 retcode = ERR_PAUSE_IS_CLEAR;
2519 drbd_adm_finish(info, retcode);
2523 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
2525 return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
2528 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
2530 struct drbd_conf *mdev;
2531 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2533 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2534 if (!adm_ctx.reply_skb)
2536 if (retcode != NO_ERROR)
2539 mdev = adm_ctx.mdev;
2540 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2541 drbd_uuid_new_current(mdev);
2542 clear_bit(NEW_CUR_UUID, &mdev->flags);
2544 drbd_suspend_io(mdev);
2545 retcode = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2546 if (retcode == SS_SUCCESS) {
2547 if (mdev->state.conn < C_CONNECTED)
2548 tl_clear(mdev->tconn);
2549 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2550 tl_restart(mdev->tconn, FAIL_FROZEN_DISK_IO);
2552 drbd_resume_io(mdev);
2555 drbd_adm_finish(info, retcode);
2559 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
2561 return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
2564 int nla_put_drbd_cfg_context(struct sk_buff *skb, struct drbd_tconn *tconn, unsigned vnr)
2567 nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2569 goto nla_put_failure;
2570 if (vnr != VOLUME_UNSPECIFIED &&
2571 nla_put_u32(skb, T_ctx_volume, vnr))
2572 goto nla_put_failure;
2573 if (nla_put_string(skb, T_ctx_resource_name, tconn->name))
2574 goto nla_put_failure;
2575 if (tconn->my_addr_len &&
2576 nla_put(skb, T_ctx_my_addr, tconn->my_addr_len, &tconn->my_addr))
2577 goto nla_put_failure;
2578 if (tconn->peer_addr_len &&
2579 nla_put(skb, T_ctx_peer_addr, tconn->peer_addr_len, &tconn->peer_addr))
2580 goto nla_put_failure;
2581 nla_nest_end(skb, nla);
2586 nla_nest_cancel(skb, nla);
2590 int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
2591 const struct sib_info *sib)
2593 struct state_info *si = NULL; /* for sizeof(si->member); */
2594 struct net_conf *nc;
2598 int exclude_sensitive;
2600 /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2601 * to. So we better exclude_sensitive information.
2603 * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2604 * in the context of the requesting user process. Exclude sensitive
2605 * information, unless current has superuser.
2607 * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2608 * relies on the current implementation of netlink_dump(), which
2609 * executes the dump callback successively from netlink_recvmsg(),
2610 * always in the context of the receiving process */
2611 exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2613 got_ldev = get_ldev(mdev);
2615 /* We need to add connection name and volume number information still.
2616 * Minor number is in drbd_genlmsghdr. */
2617 if (nla_put_drbd_cfg_context(skb, mdev->tconn, mdev->vnr))
2618 goto nla_put_failure;
2620 if (res_opts_to_skb(skb, &mdev->tconn->res_opts, exclude_sensitive))
2621 goto nla_put_failure;
2625 if (disk_conf_to_skb(skb, rcu_dereference(mdev->ldev->disk_conf), exclude_sensitive))
2626 goto nla_put_failure;
2628 nc = rcu_dereference(mdev->tconn->net_conf);
2630 err = net_conf_to_skb(skb, nc, exclude_sensitive);
2633 goto nla_put_failure;
2635 nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2637 goto nla_put_failure;
2638 if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
2639 nla_put_u32(skb, T_current_state, mdev->state.i) ||
2640 nla_put_u64(skb, T_ed_uuid, mdev->ed_uuid) ||
2641 nla_put_u64(skb, T_capacity, drbd_get_capacity(mdev->this_bdev)))
2642 goto nla_put_failure;
2645 if (nla_put_u32(skb, T_disk_flags, mdev->ldev->md.flags) ||
2646 nla_put(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid) ||
2647 nla_put_u64(skb, T_bits_total, drbd_bm_bits(mdev)) ||
2648 nla_put_u64(skb, T_bits_oos, drbd_bm_total_weight(mdev)))
2649 goto nla_put_failure;
2650 if (C_SYNC_SOURCE <= mdev->state.conn &&
2651 C_PAUSED_SYNC_T >= mdev->state.conn) {
2652 if (nla_put_u64(skb, T_bits_rs_total, mdev->rs_total) ||
2653 nla_put_u64(skb, T_bits_rs_failed, mdev->rs_failed))
2654 goto nla_put_failure;
2659 switch(sib->sib_reason) {
2660 case SIB_SYNC_PROGRESS:
2661 case SIB_GET_STATUS_REPLY:
2663 case SIB_STATE_CHANGE:
2664 if (nla_put_u32(skb, T_prev_state, sib->os.i) ||
2665 nla_put_u32(skb, T_new_state, sib->ns.i))
2666 goto nla_put_failure;
2668 case SIB_HELPER_POST:
2669 if (nla_put_u32(skb, T_helper_exit_code,
2670 sib->helper_exit_code))
2671 goto nla_put_failure;
2673 case SIB_HELPER_PRE:
2674 if (nla_put_string(skb, T_helper, sib->helper_name))
2675 goto nla_put_failure;
2679 nla_nest_end(skb, nla);
2689 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
2691 enum drbd_ret_code retcode;
2694 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2695 if (!adm_ctx.reply_skb)
2697 if (retcode != NO_ERROR)
2700 err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.mdev, NULL);
2702 nlmsg_free(adm_ctx.reply_skb);
2706 drbd_adm_finish(info, retcode);
2710 int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
2712 struct drbd_conf *mdev;
2713 struct drbd_genlmsghdr *dh;
2714 struct drbd_tconn *pos = (struct drbd_tconn*)cb->args[0];
2715 struct drbd_tconn *tconn = NULL;
2716 struct drbd_tconn *tmp;
2717 unsigned volume = cb->args[1];
2719 /* Open coded, deferred, iteration:
2720 * list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
2721 * idr_for_each_entry(&tconn->volumes, mdev, i) {
2725 * where tconn is cb->args[0];
2726 * and i is cb->args[1];
2728 * cb->args[2] indicates if we shall loop over all resources,
2729 * or just dump all volumes of a single resource.
2731 * This may miss entries inserted after this dump started,
2732 * or entries deleted before they are reached.
2734 * We need to make sure the mdev won't disappear while
2735 * we are looking at it, and revalidate our iterators
2736 * on each iteration.
2739 /* synchronize with conn_create()/conn_destroy() */
2741 /* revalidate iterator position */
2742 list_for_each_entry_rcu(tmp, &drbd_tconns, all_tconn) {
2744 /* first iteration */
2756 mdev = idr_get_next(&tconn->volumes, &volume);
2758 /* No more volumes to dump on this tconn.
2759 * Advance tconn iterator. */
2760 pos = list_entry_rcu(tconn->all_tconn.next,
2761 struct drbd_tconn, all_tconn);
2762 /* Did we dump any volume on this tconn yet? */
2764 /* If we reached the end of the list,
2765 * or only a single resource dump was requested,
2767 if (&pos->all_tconn == &drbd_tconns || cb->args[2])
2775 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).pid,
2776 cb->nlh->nlmsg_seq, &drbd_genl_family,
2777 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
2782 /* This is a tconn without a single volume.
2783 * Suprisingly enough, it may have a network
2785 struct net_conf *nc;
2787 dh->ret_code = NO_ERROR;
2788 if (nla_put_drbd_cfg_context(skb, tconn, VOLUME_UNSPECIFIED))
2790 nc = rcu_dereference(tconn->net_conf);
2791 if (nc && net_conf_to_skb(skb, nc, 1) != 0)
2796 D_ASSERT(mdev->vnr == volume);
2797 D_ASSERT(mdev->tconn == tconn);
2799 dh->minor = mdev_to_minor(mdev);
2800 dh->ret_code = NO_ERROR;
2802 if (nla_put_status_info(skb, mdev, NULL)) {
2804 genlmsg_cancel(skb, dh);
2808 genlmsg_end(skb, dh);
2813 /* where to start the next iteration */
2814 cb->args[0] = (long)pos;
2815 cb->args[1] = (pos == tconn) ? volume + 1 : 0;
2817 /* No more tconns/volumes/minors found results in an empty skb.
2818 * Which will terminate the dump. */
2823 * Request status of all resources, or of all volumes within a single resource.
2825 * This is a dump, as the answer may not fit in a single reply skb otherwise.
2826 * Which means we cannot use the family->attrbuf or other such members, because
2827 * dump is NOT protected by the genl_lock(). During dump, we only have access
2828 * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
2830 * Once things are setup properly, we call into get_one_status().
2832 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
2834 const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
2836 const char *resource_name;
2837 struct drbd_tconn *tconn;
2840 /* Is this a followup call? */
2842 /* ... of a single resource dump,
2843 * and the resource iterator has been advanced already? */
2844 if (cb->args[2] && cb->args[2] != cb->args[0])
2845 return 0; /* DONE. */
2849 /* First call (from netlink_dump_start). We need to figure out
2850 * which resource(s) the user wants us to dump. */
2851 nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
2852 nlmsg_attrlen(cb->nlh, hdrlen),
2853 DRBD_NLA_CFG_CONTEXT);
2855 /* No explicit context given. Dump all. */
2858 maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
2859 nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
2861 return PTR_ERR(nla);
2862 /* context given, but no name present? */
2865 resource_name = nla_data(nla);
2866 tconn = conn_get_by_name(resource_name);
2871 kref_put(&tconn->kref, &conn_destroy); /* get_one_status() (re)validates tconn by itself */
2873 /* prime iterators, and set "filter" mode mark:
2874 * only dump this tconn. */
2875 cb->args[0] = (long)tconn;
2876 /* cb->args[1] = 0; passed in this way. */
2877 cb->args[2] = (long)tconn;
2880 return get_one_status(skb, cb);
2883 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
2885 enum drbd_ret_code retcode;
2886 struct timeout_parms tp;
2889 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2890 if (!adm_ctx.reply_skb)
2892 if (retcode != NO_ERROR)
2896 adm_ctx.mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2897 test_bit(USE_DEGR_WFC_T, &adm_ctx.mdev->flags) ? UT_DEGRADED :
2900 err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
2902 nlmsg_free(adm_ctx.reply_skb);
2906 drbd_adm_finish(info, retcode);
2910 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
2912 struct drbd_conf *mdev;
2913 enum drbd_ret_code retcode;
2915 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2916 if (!adm_ctx.reply_skb)
2918 if (retcode != NO_ERROR)
2921 mdev = adm_ctx.mdev;
2922 if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
2923 /* resume from last known position, if possible */
2924 struct start_ov_parms parms =
2925 { .ov_start_sector = mdev->ov_start_sector };
2926 int err = start_ov_parms_from_attrs(&parms, info);
2928 retcode = ERR_MANDATORY_TAG;
2929 drbd_msg_put_info(from_attrs_err_to_txt(err));
2932 /* w_make_ov_request expects position to be aligned */
2933 mdev->ov_start_sector = parms.ov_start_sector & ~BM_SECT_PER_BIT;
2935 /* If there is still bitmap IO pending, e.g. previous resync or verify
2936 * just being finished, wait for it before requesting a new resync. */
2937 drbd_suspend_io(mdev);
2938 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2939 retcode = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2940 drbd_resume_io(mdev);
2942 drbd_adm_finish(info, retcode);
2947 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
2949 struct drbd_conf *mdev;
2950 enum drbd_ret_code retcode;
2951 int skip_initial_sync = 0;
2953 struct new_c_uuid_parms args;
2955 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2956 if (!adm_ctx.reply_skb)
2958 if (retcode != NO_ERROR)
2961 mdev = adm_ctx.mdev;
2962 memset(&args, 0, sizeof(args));
2963 if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
2964 err = new_c_uuid_parms_from_attrs(&args, info);
2966 retcode = ERR_MANDATORY_TAG;
2967 drbd_msg_put_info(from_attrs_err_to_txt(err));
2972 mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
2974 if (!get_ldev(mdev)) {
2975 retcode = ERR_NO_DISK;
2979 /* this is "skip initial sync", assume to be clean */
2980 if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
2981 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2982 dev_info(DEV, "Preparing to skip initial sync\n");
2983 skip_initial_sync = 1;
2984 } else if (mdev->state.conn != C_STANDALONE) {
2985 retcode = ERR_CONNECTED;
2989 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2990 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2992 if (args.clear_bm) {
2993 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
2994 "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
2996 dev_err(DEV, "Writing bitmap failed with %d\n",err);
2997 retcode = ERR_IO_MD_DISK;
2999 if (skip_initial_sync) {
3000 drbd_send_uuids_skip_initial_sync(mdev);
3001 _drbd_uuid_set(mdev, UI_BITMAP, 0);
3002 drbd_print_uuids(mdev, "cleared bitmap UUID");
3003 spin_lock_irq(&mdev->tconn->req_lock);
3004 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3006 spin_unlock_irq(&mdev->tconn->req_lock);
3014 mutex_unlock(mdev->state_mutex);
3016 drbd_adm_finish(info, retcode);
3020 static enum drbd_ret_code
3021 drbd_check_resource_name(const char *name)
3023 if (!name || !name[0]) {
3024 drbd_msg_put_info("resource name missing");
3025 return ERR_MANDATORY_TAG;
3027 /* if we want to use these in sysfs/configfs/debugfs some day,
3028 * we must not allow slashes */
3029 if (strchr(name, '/')) {
3030 drbd_msg_put_info("invalid resource name");
3031 return ERR_INVALID_REQUEST;
3036 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
3038 enum drbd_ret_code retcode;
3039 struct res_opts res_opts;
3042 retcode = drbd_adm_prepare(skb, info, 0);
3043 if (!adm_ctx.reply_skb)
3045 if (retcode != NO_ERROR)
3048 set_res_opts_defaults(&res_opts);
3049 err = res_opts_from_attrs(&res_opts, info);
3050 if (err && err != -ENOMSG) {
3051 retcode = ERR_MANDATORY_TAG;
3052 drbd_msg_put_info(from_attrs_err_to_txt(err));
3056 retcode = drbd_check_resource_name(adm_ctx.resource_name);
3057 if (retcode != NO_ERROR)
3060 if (adm_ctx.tconn) {
3061 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
3062 retcode = ERR_INVALID_REQUEST;
3063 drbd_msg_put_info("resource exists");
3065 /* else: still NO_ERROR */
3069 if (!conn_create(adm_ctx.resource_name, &res_opts))
3070 retcode = ERR_NOMEM;
3072 drbd_adm_finish(info, retcode);
3076 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info)
3078 struct drbd_genlmsghdr *dh = info->userhdr;
3079 enum drbd_ret_code retcode;
3081 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3082 if (!adm_ctx.reply_skb)
3084 if (retcode != NO_ERROR)
3087 if (dh->minor > MINORMASK) {
3088 drbd_msg_put_info("requested minor out of range");
3089 retcode = ERR_INVALID_REQUEST;
3092 if (adm_ctx.volume > DRBD_VOLUME_MAX) {
3093 drbd_msg_put_info("requested volume id out of range");
3094 retcode = ERR_INVALID_REQUEST;
3098 /* drbd_adm_prepare made sure already
3099 * that mdev->tconn and mdev->vnr match the request. */
3101 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3102 retcode = ERR_MINOR_EXISTS;
3103 /* else: still NO_ERROR */
3107 retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume);
3109 drbd_adm_finish(info, retcode);
3113 static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
3115 if (mdev->state.disk == D_DISKLESS &&
3116 /* no need to be mdev->state.conn == C_STANDALONE &&
3117 * we may want to delete a minor from a live replication group.
3119 mdev->state.role == R_SECONDARY) {
3120 _drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS),
3121 CS_VERBOSE + CS_WAIT_COMPLETE);
3122 idr_remove(&mdev->tconn->volumes, mdev->vnr);
3123 idr_remove(&minors, mdev_to_minor(mdev));
3124 del_gendisk(mdev->vdisk);
3126 kref_put(&mdev->kref, &drbd_minor_destroy);
3129 return ERR_MINOR_CONFIGURED;
3132 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info)
3134 enum drbd_ret_code retcode;
3136 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3137 if (!adm_ctx.reply_skb)
3139 if (retcode != NO_ERROR)
3142 retcode = adm_delete_minor(adm_ctx.mdev);
3144 drbd_adm_finish(info, retcode);
3148 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3150 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
3151 struct drbd_conf *mdev;
3154 retcode = drbd_adm_prepare(skb, info, 0);
3155 if (!adm_ctx.reply_skb)
3157 if (retcode != NO_ERROR)
3160 if (!adm_ctx.tconn) {
3161 retcode = ERR_RES_NOT_KNOWN;
3166 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3167 retcode = drbd_set_role(mdev, R_SECONDARY, 0);
3168 if (retcode < SS_SUCCESS) {
3169 drbd_msg_put_info("failed to demote");
3174 retcode = conn_try_disconnect(adm_ctx.tconn, 0);
3175 if (retcode < SS_SUCCESS) {
3176 drbd_msg_put_info("failed to disconnect");
3181 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3182 retcode = adm_detach(mdev, 0);
3183 if (retcode < SS_SUCCESS) {
3184 drbd_msg_put_info("failed to detach");
3189 /* If we reach this, all volumes (of this tconn) are Secondary,
3190 * Disconnected, Diskless, aka Unconfigured. Make sure all threads have
3191 * actually stopped, state handling only does drbd_thread_stop_nowait(). */
3192 drbd_thread_stop(&adm_ctx.tconn->worker);
3194 /* Now, nothing can fail anymore */
3196 /* delete volumes */
3197 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3198 retcode = adm_delete_minor(mdev);
3199 if (retcode != NO_ERROR) {
3200 /* "can not happen" */
3201 drbd_msg_put_info("failed to delete volume");
3206 /* delete connection */
3207 if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3208 list_del_rcu(&adm_ctx.tconn->all_tconn);
3210 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3214 /* "can not happen" */
3215 retcode = ERR_RES_IN_USE;
3216 drbd_msg_put_info("failed to delete connection");
3220 drbd_adm_finish(info, retcode);
3224 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
3226 enum drbd_ret_code retcode;
3228 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3229 if (!adm_ctx.reply_skb)
3231 if (retcode != NO_ERROR)
3234 if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3235 list_del_rcu(&adm_ctx.tconn->all_tconn);
3237 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3241 retcode = ERR_RES_IN_USE;
3244 if (retcode == NO_ERROR)
3245 drbd_thread_stop(&adm_ctx.tconn->worker);
3247 drbd_adm_finish(info, retcode);
3251 void drbd_bcast_event(struct drbd_conf *mdev, const struct sib_info *sib)
3253 static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3254 struct sk_buff *msg;
3255 struct drbd_genlmsghdr *d_out;
3259 seq = atomic_inc_return(&drbd_genl_seq);
3260 msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3265 d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3266 if (!d_out) /* cannot happen, but anyways. */
3267 goto nla_put_failure;
3268 d_out->minor = mdev_to_minor(mdev);
3269 d_out->ret_code = NO_ERROR;
3271 if (nla_put_status_info(msg, mdev, sib))
3272 goto nla_put_failure;
3273 genlmsg_end(msg, d_out);
3274 err = drbd_genl_multicast_events(msg, 0);
3275 /* msg has been consumed or freed in netlink_broadcast() */
3276 if (err && err != -ESRCH)
3284 dev_err(DEV, "Error %d while broadcasting event. "
3285 "Event seq:%u sib_reason:%u\n",
3286 err, seq, sib->sib_reason);