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 && !capable(CAP_NET_ADMIN))
161 adm_ctx.reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
162 if (!adm_ctx.reply_skb) {
167 adm_ctx.reply_dh = genlmsg_put_reply(adm_ctx.reply_skb,
168 info, &drbd_genl_family, 0, cmd);
169 /* put of a few bytes into a fresh skb of >= 4k will always succeed.
171 if (!adm_ctx.reply_dh) {
176 adm_ctx.reply_dh->minor = d_in->minor;
177 adm_ctx.reply_dh->ret_code = NO_ERROR;
179 adm_ctx.volume = VOLUME_UNSPECIFIED;
180 if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
182 /* parse and validate only */
183 err = drbd_cfg_context_from_attrs(NULL, info);
187 /* It was present, and valid,
188 * copy it over to the reply skb. */
189 err = nla_put_nohdr(adm_ctx.reply_skb,
190 info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
191 info->attrs[DRBD_NLA_CFG_CONTEXT]);
195 /* and assign stuff to the global adm_ctx */
196 nla = nested_attr_tb[__nla_type(T_ctx_volume)];
198 adm_ctx.volume = nla_get_u32(nla);
199 nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
201 adm_ctx.resource_name = nla_data(nla);
202 adm_ctx.my_addr = nested_attr_tb[__nla_type(T_ctx_my_addr)];
203 adm_ctx.peer_addr = nested_attr_tb[__nla_type(T_ctx_peer_addr)];
204 if ((adm_ctx.my_addr &&
205 nla_len(adm_ctx.my_addr) > sizeof(adm_ctx.tconn->my_addr)) ||
206 (adm_ctx.peer_addr &&
207 nla_len(adm_ctx.peer_addr) > sizeof(adm_ctx.tconn->peer_addr))) {
213 adm_ctx.minor = d_in->minor;
214 adm_ctx.mdev = minor_to_mdev(d_in->minor);
215 adm_ctx.tconn = conn_get_by_name(adm_ctx.resource_name);
217 if (!adm_ctx.mdev && (flags & DRBD_ADM_NEED_MINOR)) {
218 drbd_msg_put_info("unknown minor");
219 return ERR_MINOR_INVALID;
221 if (!adm_ctx.tconn && (flags & DRBD_ADM_NEED_RESOURCE)) {
222 drbd_msg_put_info("unknown resource");
223 return ERR_INVALID_REQUEST;
226 if (flags & DRBD_ADM_NEED_CONNECTION) {
227 if (adm_ctx.tconn && !(flags & DRBD_ADM_NEED_RESOURCE)) {
228 drbd_msg_put_info("no resource name expected");
229 return ERR_INVALID_REQUEST;
232 drbd_msg_put_info("no minor number expected");
233 return ERR_INVALID_REQUEST;
235 if (adm_ctx.my_addr && adm_ctx.peer_addr)
236 adm_ctx.tconn = conn_get_by_addrs(nla_data(adm_ctx.my_addr),
237 nla_len(adm_ctx.my_addr),
238 nla_data(adm_ctx.peer_addr),
239 nla_len(adm_ctx.peer_addr));
240 if (!adm_ctx.tconn) {
241 drbd_msg_put_info("unknown connection");
242 return ERR_INVALID_REQUEST;
246 /* some more paranoia, if the request was over-determined */
247 if (adm_ctx.mdev && adm_ctx.tconn &&
248 adm_ctx.mdev->tconn != adm_ctx.tconn) {
249 pr_warning("request: minor=%u, resource=%s; but that minor belongs to connection %s\n",
250 adm_ctx.minor, adm_ctx.resource_name,
251 adm_ctx.mdev->tconn->name);
252 drbd_msg_put_info("minor exists in different resource");
253 return ERR_INVALID_REQUEST;
256 adm_ctx.volume != VOLUME_UNSPECIFIED &&
257 adm_ctx.volume != adm_ctx.mdev->vnr) {
258 pr_warning("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
259 adm_ctx.minor, adm_ctx.volume,
260 adm_ctx.mdev->vnr, adm_ctx.mdev->tconn->name);
261 drbd_msg_put_info("minor exists as different volume");
262 return ERR_INVALID_REQUEST;
268 nlmsg_free(adm_ctx.reply_skb);
269 adm_ctx.reply_skb = NULL;
273 static int drbd_adm_finish(struct genl_info *info, int retcode)
276 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
277 adm_ctx.tconn = NULL;
280 if (!adm_ctx.reply_skb)
283 adm_ctx.reply_dh->ret_code = retcode;
284 drbd_adm_send_reply(adm_ctx.reply_skb, info);
288 static void setup_khelper_env(struct drbd_tconn *tconn, char **envp)
292 /* FIXME: A future version will not allow this case. */
293 if (tconn->my_addr_len == 0 || tconn->peer_addr_len == 0)
296 switch (((struct sockaddr *)&tconn->peer_addr)->sa_family) {
299 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
300 &((struct sockaddr_in6 *)&tconn->peer_addr)->sin6_addr);
304 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
305 &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
309 snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
310 &((struct sockaddr_in *)&tconn->peer_addr)->sin_addr);
312 snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
315 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
317 char *envp[] = { "HOME=/",
319 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
320 (char[20]) { }, /* address family */
321 (char[60]) { }, /* address */
324 char *argv[] = {usermode_helper, cmd, mb, NULL };
325 struct drbd_tconn *tconn = mdev->tconn;
329 if (current == tconn->worker.task)
330 set_bit(CALLBACK_PENDING, &tconn->flags);
332 snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
333 setup_khelper_env(tconn, envp);
335 /* The helper may take some time.
336 * write out any unsynced meta data changes now */
339 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
340 sib.sib_reason = SIB_HELPER_PRE;
341 sib.helper_name = cmd;
342 drbd_bcast_event(mdev, &sib);
343 ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
345 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
346 usermode_helper, cmd, mb,
347 (ret >> 8) & 0xff, ret);
349 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
350 usermode_helper, cmd, mb,
351 (ret >> 8) & 0xff, ret);
352 sib.sib_reason = SIB_HELPER_POST;
353 sib.helper_exit_code = ret;
354 drbd_bcast_event(mdev, &sib);
356 if (current == tconn->worker.task)
357 clear_bit(CALLBACK_PENDING, &tconn->flags);
359 if (ret < 0) /* Ignore any ERRNOs we got. */
365 int conn_khelper(struct drbd_tconn *tconn, char *cmd)
367 char *envp[] = { "HOME=/",
369 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
370 (char[20]) { }, /* address family */
371 (char[60]) { }, /* address */
373 char *argv[] = {usermode_helper, cmd, tconn->name, NULL };
376 setup_khelper_env(tconn, envp);
379 conn_info(tconn, "helper command: %s %s %s\n", usermode_helper, cmd, tconn->name);
380 /* TODO: conn_bcast_event() ?? */
382 ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
384 conn_warn(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
385 usermode_helper, cmd, tconn->name,
386 (ret >> 8) & 0xff, ret);
388 conn_info(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
389 usermode_helper, cmd, tconn->name,
390 (ret >> 8) & 0xff, ret);
391 /* TODO: conn_bcast_event() ?? */
393 if (ret < 0) /* Ignore any ERRNOs we got. */
399 static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
401 enum drbd_fencing_p fp = FP_NOT_AVAIL;
402 struct drbd_conf *mdev;
406 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
407 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
408 fp = max_t(enum drbd_fencing_p, fp,
409 rcu_dereference(mdev->ldev->disk_conf)->fencing);
418 bool conn_try_outdate_peer(struct drbd_tconn *tconn)
420 union drbd_state mask = { };
421 union drbd_state val = { };
422 enum drbd_fencing_p fp;
426 if (tconn->cstate >= C_WF_REPORT_PARAMS) {
427 conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");
431 fp = highest_fencing_policy(tconn);
434 conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");
441 r = conn_khelper(tconn, "fence-peer");
443 switch ((r>>8) & 0xff) {
444 case 3: /* peer is inconsistent */
445 ex_to_string = "peer is inconsistent or worse";
447 val.pdsk = D_INCONSISTENT;
449 case 4: /* peer got outdated, or was already outdated */
450 ex_to_string = "peer was fenced";
452 val.pdsk = D_OUTDATED;
454 case 5: /* peer was down */
455 if (conn_highest_disk(tconn) == D_UP_TO_DATE) {
456 /* we will(have) create(d) a new UUID anyways... */
457 ex_to_string = "peer is unreachable, assumed to be dead";
459 val.pdsk = D_OUTDATED;
461 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
464 case 6: /* Peer is primary, voluntarily outdate myself.
465 * This is useful when an unconnected R_SECONDARY is asked to
466 * become R_PRIMARY, but finds the other peer being active. */
467 ex_to_string = "peer is active";
468 conn_warn(tconn, "Peer is primary, outdating myself.\n");
470 val.disk = D_OUTDATED;
473 if (fp != FP_STONITH)
474 conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");
475 ex_to_string = "peer was stonithed";
477 val.pdsk = D_OUTDATED;
480 /* The script is broken ... */
481 conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
482 return false; /* Eventually leave IO frozen */
485 conn_info(tconn, "fence-peer helper returned %d (%s)\n",
486 (r>>8) & 0xff, ex_to_string);
491 conn_request_state(tconn, mask, val, CS_VERBOSE);
492 here, because we might were able to re-establish the connection in the
494 spin_lock_irq(&tconn->req_lock);
495 if (tconn->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &tconn->flags))
496 _conn_request_state(tconn, mask, val, CS_VERBOSE);
497 spin_unlock_irq(&tconn->req_lock);
499 return conn_highest_pdsk(tconn) <= D_OUTDATED;
502 static int _try_outdate_peer_async(void *data)
504 struct drbd_tconn *tconn = (struct drbd_tconn *)data;
506 conn_try_outdate_peer(tconn);
508 kref_put(&tconn->kref, &conn_destroy);
512 void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
514 struct task_struct *opa;
516 kref_get(&tconn->kref);
517 opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
519 conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
520 kref_put(&tconn->kref, &conn_destroy);
525 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
527 const int max_tries = 4;
528 enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
532 union drbd_state mask, val;
534 if (new_role == R_PRIMARY)
535 request_ping(mdev->tconn); /* Detect a dead peer ASAP */
537 mutex_lock(mdev->state_mutex);
539 mask.i = 0; mask.role = R_MASK;
540 val.i = 0; val.role = new_role;
542 while (try++ < max_tries) {
543 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
545 /* in case we first succeeded to outdate,
546 * but now suddenly could establish a connection */
547 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
553 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
554 (mdev->state.disk < D_UP_TO_DATE &&
555 mdev->state.disk >= D_INCONSISTENT)) {
557 val.disk = D_UP_TO_DATE;
562 if (rv == SS_NO_UP_TO_DATE_DISK &&
563 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
564 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
566 if (conn_try_outdate_peer(mdev->tconn)) {
567 val.disk = D_UP_TO_DATE;
573 if (rv == SS_NOTHING_TO_DO)
575 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
576 if (!conn_try_outdate_peer(mdev->tconn) && force) {
577 dev_warn(DEV, "Forced into split brain situation!\n");
579 val.pdsk = D_OUTDATED;
584 if (rv == SS_TWO_PRIMARIES) {
585 /* Maybe the peer is detected as dead very soon...
586 retry at most once more in this case. */
589 nc = rcu_dereference(mdev->tconn->net_conf);
590 timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
592 schedule_timeout_interruptible(timeo);
597 if (rv < SS_SUCCESS) {
598 rv = _drbd_request_state(mdev, mask, val,
599 CS_VERBOSE + CS_WAIT_COMPLETE);
610 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
612 /* Wait until nothing is on the fly :) */
613 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
615 /* FIXME also wait for all pending P_BARRIER_ACK? */
617 if (new_role == R_SECONDARY) {
618 set_disk_ro(mdev->vdisk, true);
619 if (get_ldev(mdev)) {
620 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
624 mutex_lock(&mdev->tconn->conf_update);
625 nc = mdev->tconn->net_conf;
627 nc->discard_my_data = 0; /* without copy; single bit op is atomic */
628 mutex_unlock(&mdev->tconn->conf_update);
630 set_disk_ro(mdev->vdisk, false);
631 if (get_ldev(mdev)) {
632 if (((mdev->state.conn < C_CONNECTED ||
633 mdev->state.pdsk <= D_FAILED)
634 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
635 drbd_uuid_new_current(mdev);
637 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
642 /* writeout of activity log covered areas of the bitmap
643 * to stable storage done in after state change already */
645 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
646 /* if this was forced, we should consider sync */
648 drbd_send_uuids(mdev);
649 drbd_send_current_state(mdev);
654 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
656 mutex_unlock(mdev->state_mutex);
660 static const char *from_attrs_err_to_txt(int err)
662 return err == -ENOMSG ? "required attribute missing" :
663 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
664 err == -EEXIST ? "can not change invariant setting" :
665 "invalid attribute value";
668 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
670 struct set_role_parms parms;
672 enum drbd_ret_code retcode;
674 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
675 if (!adm_ctx.reply_skb)
677 if (retcode != NO_ERROR)
680 memset(&parms, 0, sizeof(parms));
681 if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
682 err = set_role_parms_from_attrs(&parms, info);
684 retcode = ERR_MANDATORY_TAG;
685 drbd_msg_put_info(from_attrs_err_to_txt(err));
690 if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
691 retcode = drbd_set_role(adm_ctx.mdev, R_PRIMARY, parms.assume_uptodate);
693 retcode = drbd_set_role(adm_ctx.mdev, R_SECONDARY, 0);
695 drbd_adm_finish(info, retcode);
699 /* Initializes the md.*_offset members, so we are able to find
700 * the on disk meta data.
702 * We currently have two possible layouts:
704 * |----------- md_size_sect ------------------|
705 * [ 4k superblock ][ activity log ][ Bitmap ]
707 * | bm_offset = al_offset + X |
708 * ==> bitmap sectors = md_size_sect - bm_offset
711 * |----------- md_size_sect ------------------|
712 * [data.....][ Bitmap ][ activity log ][ 4k superblock ]
714 * | bm_offset = al_offset - Y |
715 * ==> bitmap sectors = Y = al_offset - bm_offset
717 * Activity log size used to be fixed 32kB,
718 * but is about to become configurable.
720 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
721 struct drbd_backing_dev *bdev)
723 sector_t md_size_sect = 0;
724 unsigned int al_size_sect = MD_32kB_SECT;
728 meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
730 bdev->md.md_offset = drbd_md_ss(bdev);
732 switch (meta_dev_idx) {
734 /* v07 style fixed size indexed meta data */
735 bdev->md.md_size_sect = MD_128MB_SECT;
736 bdev->md.al_offset = MD_4kB_SECT;
737 bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
739 case DRBD_MD_INDEX_FLEX_EXT:
740 /* just occupy the full device; unit: sectors */
741 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
742 bdev->md.al_offset = MD_4kB_SECT;
743 bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
745 case DRBD_MD_INDEX_INTERNAL:
746 case DRBD_MD_INDEX_FLEX_INT:
747 /* al size is still fixed */
748 bdev->md.al_offset = -al_size_sect;
749 /* we need (slightly less than) ~ this much bitmap sectors: */
750 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
751 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
752 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
753 md_size_sect = ALIGN(md_size_sect, 8);
755 /* plus the "drbd meta data super block",
756 * and the activity log; */
757 md_size_sect += MD_4kB_SECT + al_size_sect;
759 bdev->md.md_size_sect = md_size_sect;
760 /* bitmap offset is adjusted by 'super' block size */
761 bdev->md.bm_offset = -md_size_sect + MD_4kB_SECT;
767 /* input size is expected to be in KB */
768 char *ppsize(char *buf, unsigned long long size)
770 /* Needs 9 bytes at max including trailing NUL:
771 * -1ULL ==> "16384 EB" */
772 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
774 while (size >= 10000 && base < sizeof(units)-1) {
776 size = (size >> 10) + !!(size & (1<<9));
779 sprintf(buf, "%u %cB", (unsigned)size, units[base]);
784 /* there is still a theoretical deadlock when called from receiver
785 * on an D_INCONSISTENT R_PRIMARY:
786 * remote READ does inc_ap_bio, receiver would need to receive answer
787 * packet from remote to dec_ap_bio again.
788 * receiver receive_sizes(), comes here,
789 * waits for ap_bio_cnt == 0. -> deadlock.
790 * but this cannot happen, actually, because:
791 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
792 * (not connected, or bad/no disk on peer):
793 * see drbd_fail_request_early, ap_bio_cnt is zero.
794 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
795 * peer may not initiate a resize.
797 /* Note these are not to be confused with
798 * drbd_adm_suspend_io/drbd_adm_resume_io,
799 * which are (sub) state changes triggered by admin (drbdsetup),
800 * and can be long lived.
801 * This changes an mdev->flag, is triggered by drbd internals,
802 * and should be short-lived. */
803 void drbd_suspend_io(struct drbd_conf *mdev)
805 set_bit(SUSPEND_IO, &mdev->flags);
806 if (drbd_suspended(mdev))
808 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
811 void drbd_resume_io(struct drbd_conf *mdev)
813 clear_bit(SUSPEND_IO, &mdev->flags);
814 wake_up(&mdev->misc_wait);
818 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
819 * @mdev: DRBD device.
821 * Returns 0 on success, negative return values indicate errors.
822 * You should call drbd_md_sync() after calling this function.
824 enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
826 sector_t prev_first_sect, prev_size; /* previous meta location */
827 sector_t la_size, u_size;
831 int md_moved, la_size_changed;
832 enum determine_dev_size rv = unchanged;
835 * application request passes inc_ap_bio,
836 * but then cannot get an AL-reference.
837 * this function later may wait on ap_bio_cnt == 0. -> deadlock.
840 * Suspend IO right here.
841 * still lock the act_log to not trigger ASSERTs there.
843 drbd_suspend_io(mdev);
845 /* no wait necessary anymore, actually we could assert that */
846 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
848 prev_first_sect = drbd_md_first_sector(mdev->ldev);
849 prev_size = mdev->ldev->md.md_size_sect;
850 la_size = mdev->ldev->md.la_size_sect;
852 /* TODO: should only be some assert here, not (re)init... */
853 drbd_md_set_sector_offsets(mdev, mdev->ldev);
856 u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
858 size = drbd_new_dev_size(mdev, mdev->ldev, u_size, flags & DDSF_FORCED);
860 if (drbd_get_capacity(mdev->this_bdev) != size ||
861 drbd_bm_capacity(mdev) != size) {
863 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
865 /* currently there is only one error: ENOMEM! */
866 size = drbd_bm_capacity(mdev)>>1;
868 dev_err(DEV, "OUT OF MEMORY! "
869 "Could not allocate bitmap!\n");
871 dev_err(DEV, "BM resizing failed. "
872 "Leaving size unchanged at size = %lu KB\n",
873 (unsigned long)size);
877 /* racy, see comments above. */
878 drbd_set_my_capacity(mdev, size);
879 mdev->ldev->md.la_size_sect = size;
880 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
881 (unsigned long long)size>>1);
883 if (rv == dev_size_error)
886 la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
888 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
889 || prev_size != mdev->ldev->md.md_size_sect;
891 if (la_size_changed || md_moved) {
894 drbd_al_shrink(mdev); /* All extents inactive. */
895 dev_info(DEV, "Writing the whole bitmap, %s\n",
896 la_size_changed && md_moved ? "size changed and md moved" :
897 la_size_changed ? "size changed" : "md moved");
898 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
899 err = drbd_bitmap_io(mdev, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
900 "size changed", BM_LOCKED_MASK);
905 drbd_md_mark_dirty(mdev);
913 lc_unlock(mdev->act_log);
914 wake_up(&mdev->al_wait);
915 drbd_resume_io(mdev);
921 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
922 sector_t u_size, int assume_peer_has_space)
924 sector_t p_size = mdev->p_size; /* partner's disk size. */
925 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
926 sector_t m_size; /* my size */
929 m_size = drbd_get_max_capacity(bdev);
931 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
932 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
936 if (p_size && m_size) {
937 size = min_t(sector_t, p_size, m_size);
941 if (m_size && m_size < size)
943 if (p_size && p_size < size)
954 dev_err(DEV, "Both nodes diskless!\n");
958 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
959 (unsigned long)u_size>>1, (unsigned long)size>>1);
968 * drbd_check_al_size() - Ensures that the AL is of the right size
969 * @mdev: DRBD device.
971 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
972 * failed, and 0 on success. You should call drbd_md_sync() after you called
975 static int drbd_check_al_size(struct drbd_conf *mdev, struct disk_conf *dc)
977 struct lru_cache *n, *t;
978 struct lc_element *e;
983 mdev->act_log->nr_elements == dc->al_extents)
988 n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
989 dc->al_extents, sizeof(struct lc_element), 0);
992 dev_err(DEV, "Cannot allocate act_log lru!\n");
995 spin_lock_irq(&mdev->al_lock);
997 for (i = 0; i < t->nr_elements; i++) {
998 e = lc_element_by_index(t, i);
1000 dev_err(DEV, "refcnt(%d)==%d\n",
1001 e->lc_number, e->refcnt);
1002 in_use += e->refcnt;
1007 spin_unlock_irq(&mdev->al_lock);
1009 dev_err(DEV, "Activity log still in use!\n");
1016 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
1020 static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
1022 struct request_queue * const q = mdev->rq_queue;
1023 unsigned int max_hw_sectors = max_bio_size >> 9;
1024 unsigned int max_segments = 0;
1026 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1027 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1029 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
1031 max_segments = rcu_dereference(mdev->ldev->disk_conf)->max_bio_bvecs;
1036 blk_queue_logical_block_size(q, 512);
1037 blk_queue_max_hw_sectors(q, max_hw_sectors);
1038 /* This is the workaround for "bio would need to, but cannot, be split" */
1039 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
1040 blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
1042 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1043 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
1045 blk_queue_stack_limits(q, b);
1047 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
1048 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
1049 q->backing_dev_info.ra_pages,
1050 b->backing_dev_info.ra_pages);
1051 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1057 void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
1059 unsigned int now, new, local, peer;
1061 now = queue_max_hw_sectors(mdev->rq_queue) << 9;
1062 local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
1063 peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
1065 if (get_ldev_if_state(mdev, D_ATTACHING)) {
1066 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
1067 mdev->local_max_bio_size = local;
1070 local = min(local, DRBD_MAX_BIO_SIZE);
1072 /* We may ignore peer limits if the peer is modern enough.
1073 Because new from 8.3.8 onwards the peer can use multiple
1074 BIOs for a single peer_request */
1075 if (mdev->state.conn >= C_CONNECTED) {
1076 if (mdev->tconn->agreed_pro_version < 94)
1077 peer = min( mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
1078 /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
1079 else if (mdev->tconn->agreed_pro_version == 94)
1080 peer = DRBD_MAX_SIZE_H80_PACKET;
1081 else if (mdev->tconn->agreed_pro_version < 100)
1082 peer = DRBD_MAX_BIO_SIZE_P95; /* drbd 8.3.8 onwards, before 8.4.0 */
1084 peer = DRBD_MAX_BIO_SIZE;
1087 new = min(local, peer);
1089 if (mdev->state.role == R_PRIMARY && new < now)
1090 dev_err(DEV, "ASSERT FAILED new < now; (%u < %u)\n", new, now);
1093 dev_info(DEV, "max BIO size = %u\n", new);
1095 drbd_setup_queue_param(mdev, new);
1098 /* Starts the worker thread */
1099 static void conn_reconfig_start(struct drbd_tconn *tconn)
1101 drbd_thread_start(&tconn->worker);
1102 conn_flush_workqueue(tconn);
1105 /* if still unconfigured, stops worker again. */
1106 static void conn_reconfig_done(struct drbd_tconn *tconn)
1109 spin_lock_irq(&tconn->req_lock);
1110 stop_threads = conn_all_vols_unconf(tconn) &&
1111 tconn->cstate == C_STANDALONE;
1112 spin_unlock_irq(&tconn->req_lock);
1114 /* asender is implicitly stopped by receiver
1115 * in conn_disconnect() */
1116 drbd_thread_stop(&tconn->receiver);
1117 drbd_thread_stop(&tconn->worker);
1121 /* Make sure IO is suspended before calling this function(). */
1122 static void drbd_suspend_al(struct drbd_conf *mdev)
1126 if (!lc_try_lock(mdev->act_log)) {
1127 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
1131 drbd_al_shrink(mdev);
1132 spin_lock_irq(&mdev->tconn->req_lock);
1133 if (mdev->state.conn < C_CONNECTED)
1134 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
1135 spin_unlock_irq(&mdev->tconn->req_lock);
1136 lc_unlock(mdev->act_log);
1139 dev_info(DEV, "Suspended AL updates\n");
1143 static bool should_set_defaults(struct genl_info *info)
1145 unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1146 return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1149 static void enforce_disk_conf_limits(struct disk_conf *dc)
1151 if (dc->al_extents < DRBD_AL_EXTENTS_MIN)
1152 dc->al_extents = DRBD_AL_EXTENTS_MIN;
1153 if (dc->al_extents > DRBD_AL_EXTENTS_MAX)
1154 dc->al_extents = DRBD_AL_EXTENTS_MAX;
1156 if (dc->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
1157 dc->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
1160 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1162 enum drbd_ret_code retcode;
1163 struct drbd_conf *mdev;
1164 struct disk_conf *new_disk_conf, *old_disk_conf;
1165 struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
1168 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1169 if (!adm_ctx.reply_skb)
1171 if (retcode != NO_ERROR)
1174 mdev = adm_ctx.mdev;
1176 /* we also need a disk
1177 * to change the options on */
1178 if (!get_ldev(mdev)) {
1179 retcode = ERR_NO_DISK;
1183 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
1184 if (!new_disk_conf) {
1185 retcode = ERR_NOMEM;
1189 mutex_lock(&mdev->tconn->conf_update);
1190 old_disk_conf = mdev->ldev->disk_conf;
1191 *new_disk_conf = *old_disk_conf;
1192 if (should_set_defaults(info))
1193 set_disk_conf_defaults(new_disk_conf);
1195 err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1196 if (err && err != -ENOMSG) {
1197 retcode = ERR_MANDATORY_TAG;
1198 drbd_msg_put_info(from_attrs_err_to_txt(err));
1201 if (!expect(new_disk_conf->resync_rate >= 1))
1202 new_disk_conf->resync_rate = 1;
1204 enforce_disk_conf_limits(new_disk_conf);
1206 fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1207 if (fifo_size != mdev->rs_plan_s->size) {
1208 new_plan = fifo_alloc(fifo_size);
1210 dev_err(DEV, "kmalloc of fifo_buffer failed");
1211 retcode = ERR_NOMEM;
1216 drbd_suspend_io(mdev);
1217 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1218 drbd_al_shrink(mdev);
1219 err = drbd_check_al_size(mdev, new_disk_conf);
1220 lc_unlock(mdev->act_log);
1221 wake_up(&mdev->al_wait);
1222 drbd_resume_io(mdev);
1225 retcode = ERR_NOMEM;
1229 write_lock_irq(&global_state_lock);
1230 retcode = drbd_resync_after_valid(mdev, new_disk_conf->resync_after);
1231 if (retcode == NO_ERROR) {
1232 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
1233 drbd_resync_after_changed(mdev);
1235 write_unlock_irq(&global_state_lock);
1237 if (retcode != NO_ERROR)
1241 old_plan = mdev->rs_plan_s;
1242 rcu_assign_pointer(mdev->rs_plan_s, new_plan);
1245 mutex_unlock(&mdev->tconn->conf_update);
1247 if (new_disk_conf->al_updates)
1248 mdev->ldev->md.flags &= ~MDF_AL_DISABLED;
1250 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1252 if (new_disk_conf->md_flushes)
1253 clear_bit(MD_NO_FUA, &mdev->flags);
1255 set_bit(MD_NO_FUA, &mdev->flags);
1257 drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1261 if (mdev->state.conn >= C_CONNECTED)
1262 drbd_send_sync_param(mdev);
1265 kfree(old_disk_conf);
1267 mod_timer(&mdev->request_timer, jiffies + HZ);
1271 mutex_unlock(&mdev->tconn->conf_update);
1273 kfree(new_disk_conf);
1278 drbd_adm_finish(info, retcode);
1282 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1284 struct drbd_conf *mdev;
1286 enum drbd_ret_code retcode;
1287 enum determine_dev_size dd;
1288 sector_t max_possible_sectors;
1289 sector_t min_md_device_sectors;
1290 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1291 struct disk_conf *new_disk_conf = NULL;
1292 struct block_device *bdev;
1293 struct lru_cache *resync_lru = NULL;
1294 struct fifo_buffer *new_plan = NULL;
1295 union drbd_state ns, os;
1296 enum drbd_state_rv rv;
1297 struct net_conf *nc;
1299 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1300 if (!adm_ctx.reply_skb)
1302 if (retcode != NO_ERROR)
1305 mdev = adm_ctx.mdev;
1306 conn_reconfig_start(mdev->tconn);
1308 /* if you want to reconfigure, please tear down first */
1309 if (mdev->state.disk > D_DISKLESS) {
1310 retcode = ERR_DISK_CONFIGURED;
1313 /* It may just now have detached because of IO error. Make sure
1314 * drbd_ldev_destroy is done already, we may end up here very fast,
1315 * e.g. if someone calls attach from the on-io-error handler,
1316 * to realize a "hot spare" feature (not that I'd recommend that) */
1317 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1319 /* make sure there is no leftover from previous force-detach attempts */
1320 clear_bit(FORCE_DETACH, &mdev->flags);
1321 clear_bit(WAS_IO_ERROR, &mdev->flags);
1322 clear_bit(WAS_READ_ERROR, &mdev->flags);
1324 /* and no leftover from previously aborted resync or verify, either */
1326 mdev->rs_failed = 0;
1327 atomic_set(&mdev->rs_pending_cnt, 0);
1329 /* allocation not in the IO path, drbdsetup context */
1330 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1332 retcode = ERR_NOMEM;
1335 spin_lock_init(&nbc->md.uuid_lock);
1337 new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
1338 if (!new_disk_conf) {
1339 retcode = ERR_NOMEM;
1342 nbc->disk_conf = new_disk_conf;
1344 set_disk_conf_defaults(new_disk_conf);
1345 err = disk_conf_from_attrs(new_disk_conf, info);
1347 retcode = ERR_MANDATORY_TAG;
1348 drbd_msg_put_info(from_attrs_err_to_txt(err));
1352 enforce_disk_conf_limits(new_disk_conf);
1354 new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
1356 retcode = ERR_NOMEM;
1360 if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1361 retcode = ERR_MD_IDX_INVALID;
1366 nc = rcu_dereference(mdev->tconn->net_conf);
1368 if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1370 retcode = ERR_STONITH_AND_PROT_A;
1376 bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
1377 FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
1379 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
1381 retcode = ERR_OPEN_DISK;
1384 nbc->backing_bdev = bdev;
1387 * meta_dev_idx >= 0: external fixed size, possibly multiple
1388 * drbd sharing one meta device. TODO in that case, paranoia
1389 * check that [md_bdev, meta_dev_idx] is not yet used by some
1390 * other drbd minor! (if you use drbd.conf + drbdadm, that
1391 * should check it for you already; but if you don't, or
1392 * someone fooled it, we need to double check here)
1394 bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
1395 FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1396 (new_disk_conf->meta_dev_idx < 0) ?
1397 (void *)mdev : (void *)drbd_m_holder);
1399 dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
1401 retcode = ERR_OPEN_MD_DISK;
1404 nbc->md_bdev = bdev;
1406 if ((nbc->backing_bdev == nbc->md_bdev) !=
1407 (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1408 new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1409 retcode = ERR_MD_IDX_INVALID;
1413 resync_lru = lc_create("resync", drbd_bm_ext_cache,
1414 1, 61, sizeof(struct bm_extent),
1415 offsetof(struct bm_extent, lce));
1417 retcode = ERR_NOMEM;
1421 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1422 drbd_md_set_sector_offsets(mdev, nbc);
1424 if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
1425 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1426 (unsigned long long) drbd_get_max_capacity(nbc),
1427 (unsigned long long) new_disk_conf->disk_size);
1428 retcode = ERR_DISK_TOO_SMALL;
1432 if (new_disk_conf->meta_dev_idx < 0) {
1433 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1434 /* at least one MB, otherwise it does not make sense */
1435 min_md_device_sectors = (2<<10);
1437 max_possible_sectors = DRBD_MAX_SECTORS;
1438 min_md_device_sectors = MD_128MB_SECT * (new_disk_conf->meta_dev_idx + 1);
1441 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1442 retcode = ERR_MD_DISK_TOO_SMALL;
1443 dev_warn(DEV, "refusing attach: md-device too small, "
1444 "at least %llu sectors needed for this meta-disk type\n",
1445 (unsigned long long) min_md_device_sectors);
1449 /* Make sure the new disk is big enough
1450 * (we may currently be R_PRIMARY with no local disk...) */
1451 if (drbd_get_max_capacity(nbc) <
1452 drbd_get_capacity(mdev->this_bdev)) {
1453 retcode = ERR_DISK_TOO_SMALL;
1457 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1459 if (nbc->known_size > max_possible_sectors) {
1460 dev_warn(DEV, "==> truncating very big lower level device "
1461 "to currently maximum possible %llu sectors <==\n",
1462 (unsigned long long) max_possible_sectors);
1463 if (new_disk_conf->meta_dev_idx >= 0)
1464 dev_warn(DEV, "==>> using internal or flexible "
1465 "meta data may help <<==\n");
1468 drbd_suspend_io(mdev);
1469 /* also wait for the last barrier ack. */
1470 /* FIXME see also https://daiquiri.linbit/cgi-bin/bugzilla/show_bug.cgi?id=171
1471 * We need a way to either ignore barrier acks for barriers sent before a device
1472 * was attached, or a way to wait for all pending barrier acks to come in.
1473 * As barriers are counted per resource,
1474 * we'd need to suspend io on all devices of a resource.
1476 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || drbd_suspended(mdev));
1477 /* and for any other previously queued work */
1478 drbd_flush_workqueue(mdev);
1480 rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1481 retcode = rv; /* FIXME: Type mismatch. */
1482 drbd_resume_io(mdev);
1483 if (rv < SS_SUCCESS)
1486 if (!get_ldev_if_state(mdev, D_ATTACHING))
1487 goto force_diskless;
1489 drbd_md_set_sector_offsets(mdev, nbc);
1491 if (!mdev->bitmap) {
1492 if (drbd_bm_init(mdev)) {
1493 retcode = ERR_NOMEM;
1494 goto force_diskless_dec;
1498 retcode = drbd_md_read(mdev, nbc);
1499 if (retcode != NO_ERROR)
1500 goto force_diskless_dec;
1502 if (mdev->state.conn < C_CONNECTED &&
1503 mdev->state.role == R_PRIMARY &&
1504 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1505 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1506 (unsigned long long)mdev->ed_uuid);
1507 retcode = ERR_DATA_NOT_CURRENT;
1508 goto force_diskless_dec;
1511 /* Since we are diskless, fix the activity log first... */
1512 if (drbd_check_al_size(mdev, new_disk_conf)) {
1513 retcode = ERR_NOMEM;
1514 goto force_diskless_dec;
1517 /* Prevent shrinking of consistent devices ! */
1518 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1519 drbd_new_dev_size(mdev, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
1520 dev_warn(DEV, "refusing to truncate a consistent device\n");
1521 retcode = ERR_DISK_TOO_SMALL;
1522 goto force_diskless_dec;
1525 /* Reset the "barriers don't work" bits here, then force meta data to
1526 * be written, to ensure we determine if barriers are supported. */
1527 if (new_disk_conf->md_flushes)
1528 clear_bit(MD_NO_FUA, &mdev->flags);
1530 set_bit(MD_NO_FUA, &mdev->flags);
1532 /* Point of no return reached.
1533 * Devices and memory are no longer released by error cleanup below.
1534 * now mdev takes over responsibility, and the state engine should
1535 * clean it up somewhere. */
1536 D_ASSERT(mdev->ldev == NULL);
1538 mdev->resync = resync_lru;
1539 mdev->rs_plan_s = new_plan;
1542 new_disk_conf = NULL;
1545 drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
1547 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1548 set_bit(CRASHED_PRIMARY, &mdev->flags);
1550 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1552 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1553 !(mdev->state.role == R_PRIMARY && mdev->tconn->susp_nod))
1554 set_bit(CRASHED_PRIMARY, &mdev->flags);
1561 drbd_reconsider_max_bio_size(mdev);
1563 /* If I am currently not R_PRIMARY,
1564 * but meta data primary indicator is set,
1565 * I just now recover from a hard crash,
1566 * and have been R_PRIMARY before that crash.
1568 * Now, if I had no connection before that crash
1569 * (have been degraded R_PRIMARY), chances are that
1570 * I won't find my peer now either.
1572 * In that case, and _only_ in that case,
1573 * we use the degr-wfc-timeout instead of the default,
1574 * so we can automatically recover from a crash of a
1575 * degraded but active "cluster" after a certain timeout.
1577 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1578 if (mdev->state.role != R_PRIMARY &&
1579 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1580 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1581 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1583 dd = drbd_determine_dev_size(mdev, 0);
1584 if (dd == dev_size_error) {
1585 retcode = ERR_NOMEM_BITMAP;
1586 goto force_diskless_dec;
1587 } else if (dd == grew)
1588 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1590 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC) ||
1591 (test_bit(CRASHED_PRIMARY, &mdev->flags) &&
1592 drbd_md_test_flag(mdev->ldev, MDF_AL_DISABLED))) {
1593 dev_info(DEV, "Assuming that all blocks are out of sync "
1594 "(aka FullSync)\n");
1595 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1596 "set_n_write from attaching", BM_LOCKED_MASK)) {
1597 retcode = ERR_IO_MD_DISK;
1598 goto force_diskless_dec;
1601 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1602 "read from attaching", BM_LOCKED_MASK)) {
1603 retcode = ERR_IO_MD_DISK;
1604 goto force_diskless_dec;
1608 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1609 drbd_suspend_al(mdev); /* IO is still suspended here... */
1611 spin_lock_irq(&mdev->tconn->req_lock);
1612 os = drbd_read_state(mdev);
1614 /* If MDF_CONSISTENT is not set go into inconsistent state,
1615 otherwise investigate MDF_WasUpToDate...
1616 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1617 otherwise into D_CONSISTENT state.
1619 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1620 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1621 ns.disk = D_CONSISTENT;
1623 ns.disk = D_OUTDATED;
1625 ns.disk = D_INCONSISTENT;
1628 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1629 ns.pdsk = D_OUTDATED;
1632 if (ns.disk == D_CONSISTENT &&
1633 (ns.pdsk == D_OUTDATED || rcu_dereference(mdev->ldev->disk_conf)->fencing == FP_DONT_CARE))
1634 ns.disk = D_UP_TO_DATE;
1636 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1637 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1638 this point, because drbd_request_state() modifies these
1641 if (rcu_dereference(mdev->ldev->disk_conf)->al_updates)
1642 mdev->ldev->md.flags &= ~MDF_AL_DISABLED;
1644 mdev->ldev->md.flags |= MDF_AL_DISABLED;
1648 /* In case we are C_CONNECTED postpone any decision on the new disk
1649 state after the negotiation phase. */
1650 if (mdev->state.conn == C_CONNECTED) {
1651 mdev->new_state_tmp.i = ns.i;
1653 ns.disk = D_NEGOTIATING;
1655 /* We expect to receive up-to-date UUIDs soon.
1656 To avoid a race in receive_state, free p_uuid while
1657 holding req_lock. I.e. atomic with the state change */
1658 kfree(mdev->p_uuid);
1659 mdev->p_uuid = NULL;
1662 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1663 spin_unlock_irq(&mdev->tconn->req_lock);
1665 if (rv < SS_SUCCESS)
1666 goto force_diskless_dec;
1668 mod_timer(&mdev->request_timer, jiffies + HZ);
1670 if (mdev->state.role == R_PRIMARY)
1671 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1673 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1675 drbd_md_mark_dirty(mdev);
1678 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1680 conn_reconfig_done(mdev->tconn);
1681 drbd_adm_finish(info, retcode);
1687 drbd_force_state(mdev, NS(disk, D_DISKLESS));
1690 conn_reconfig_done(mdev->tconn);
1692 if (nbc->backing_bdev)
1693 blkdev_put(nbc->backing_bdev,
1694 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1696 blkdev_put(nbc->md_bdev,
1697 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1700 kfree(new_disk_conf);
1701 lc_destroy(resync_lru);
1705 drbd_adm_finish(info, retcode);
1709 static int adm_detach(struct drbd_conf *mdev, int force)
1711 enum drbd_state_rv retcode;
1715 set_bit(FORCE_DETACH, &mdev->flags);
1716 drbd_force_state(mdev, NS(disk, D_FAILED));
1717 retcode = SS_SUCCESS;
1721 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1722 drbd_md_get_buffer(mdev); /* make sure there is no in-flight meta-data IO */
1723 retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1724 drbd_md_put_buffer(mdev);
1725 /* D_FAILED will transition to DISKLESS. */
1726 ret = wait_event_interruptible(mdev->misc_wait,
1727 mdev->state.disk != D_FAILED);
1728 drbd_resume_io(mdev);
1729 if ((int)retcode == (int)SS_IS_DISKLESS)
1730 retcode = SS_NOTHING_TO_DO;
1737 /* Detaching the disk is a process in multiple stages. First we need to lock
1738 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1739 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1740 * internal references as well.
1741 * Only then we have finally detached. */
1742 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
1744 enum drbd_ret_code retcode;
1745 struct detach_parms parms = { };
1748 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1749 if (!adm_ctx.reply_skb)
1751 if (retcode != NO_ERROR)
1754 if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
1755 err = detach_parms_from_attrs(&parms, info);
1757 retcode = ERR_MANDATORY_TAG;
1758 drbd_msg_put_info(from_attrs_err_to_txt(err));
1763 retcode = adm_detach(adm_ctx.mdev, parms.force_detach);
1765 drbd_adm_finish(info, retcode);
1769 static bool conn_resync_running(struct drbd_tconn *tconn)
1771 struct drbd_conf *mdev;
1776 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1777 if (mdev->state.conn == C_SYNC_SOURCE ||
1778 mdev->state.conn == C_SYNC_TARGET ||
1779 mdev->state.conn == C_PAUSED_SYNC_S ||
1780 mdev->state.conn == C_PAUSED_SYNC_T) {
1790 static bool conn_ov_running(struct drbd_tconn *tconn)
1792 struct drbd_conf *mdev;
1797 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1798 if (mdev->state.conn == C_VERIFY_S ||
1799 mdev->state.conn == C_VERIFY_T) {
1809 static enum drbd_ret_code
1810 _check_net_options(struct drbd_tconn *tconn, struct net_conf *old_conf, struct net_conf *new_conf)
1812 struct drbd_conf *mdev;
1815 if (old_conf && tconn->cstate == C_WF_REPORT_PARAMS && tconn->agreed_pro_version < 100) {
1816 if (new_conf->wire_protocol != old_conf->wire_protocol)
1817 return ERR_NEED_APV_100;
1819 if (new_conf->two_primaries != old_conf->two_primaries)
1820 return ERR_NEED_APV_100;
1822 if (strcmp(new_conf->integrity_alg, old_conf->integrity_alg))
1823 return ERR_NEED_APV_100;
1826 if (!new_conf->two_primaries &&
1827 conn_highest_role(tconn) == R_PRIMARY &&
1828 conn_highest_peer(tconn) == R_PRIMARY)
1829 return ERR_NEED_ALLOW_TWO_PRI;
1831 if (new_conf->two_primaries &&
1832 (new_conf->wire_protocol != DRBD_PROT_C))
1833 return ERR_NOT_PROTO_C;
1835 idr_for_each_entry(&tconn->volumes, mdev, i) {
1836 if (get_ldev(mdev)) {
1837 enum drbd_fencing_p fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
1839 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
1840 return ERR_STONITH_AND_PROT_A;
1842 if (mdev->state.role == R_PRIMARY && new_conf->discard_my_data)
1843 return ERR_DISCARD_IMPOSSIBLE;
1846 if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A)
1847 return ERR_CONG_NOT_PROTO_A;
1852 static enum drbd_ret_code
1853 check_net_options(struct drbd_tconn *tconn, struct net_conf *new_conf)
1855 static enum drbd_ret_code rv;
1856 struct drbd_conf *mdev;
1860 rv = _check_net_options(tconn, rcu_dereference(tconn->net_conf), new_conf);
1863 /* tconn->volumes protected by genl_lock() here */
1864 idr_for_each_entry(&tconn->volumes, mdev, i) {
1865 if (!mdev->bitmap) {
1866 if(drbd_bm_init(mdev))
1875 struct crypto_hash *verify_tfm;
1876 struct crypto_hash *csums_tfm;
1877 struct crypto_hash *cram_hmac_tfm;
1878 struct crypto_hash *integrity_tfm;
1882 alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
1887 *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
1896 static enum drbd_ret_code
1897 alloc_crypto(struct crypto *crypto, struct net_conf *new_conf)
1899 char hmac_name[CRYPTO_MAX_ALG_NAME];
1900 enum drbd_ret_code rv;
1902 rv = alloc_hash(&crypto->csums_tfm, new_conf->csums_alg,
1906 rv = alloc_hash(&crypto->verify_tfm, new_conf->verify_alg,
1910 rv = alloc_hash(&crypto->integrity_tfm, new_conf->integrity_alg,
1914 if (new_conf->cram_hmac_alg[0] != 0) {
1915 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1916 new_conf->cram_hmac_alg);
1918 rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
1925 static void free_crypto(struct crypto *crypto)
1927 crypto_free_hash(crypto->cram_hmac_tfm);
1928 crypto_free_hash(crypto->integrity_tfm);
1929 crypto_free_hash(crypto->csums_tfm);
1930 crypto_free_hash(crypto->verify_tfm);
1933 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
1935 enum drbd_ret_code retcode;
1936 struct drbd_tconn *tconn;
1937 struct net_conf *old_conf, *new_conf = NULL;
1939 int ovr; /* online verify running */
1940 int rsr; /* re-sync running */
1941 struct crypto crypto = { };
1943 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
1944 if (!adm_ctx.reply_skb)
1946 if (retcode != NO_ERROR)
1949 tconn = adm_ctx.tconn;
1951 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1953 retcode = ERR_NOMEM;
1957 conn_reconfig_start(tconn);
1959 mutex_lock(&tconn->data.mutex);
1960 mutex_lock(&tconn->conf_update);
1961 old_conf = tconn->net_conf;
1964 drbd_msg_put_info("net conf missing, try connect");
1965 retcode = ERR_INVALID_REQUEST;
1969 *new_conf = *old_conf;
1970 if (should_set_defaults(info))
1971 set_net_conf_defaults(new_conf);
1973 err = net_conf_from_attrs_for_change(new_conf, info);
1974 if (err && err != -ENOMSG) {
1975 retcode = ERR_MANDATORY_TAG;
1976 drbd_msg_put_info(from_attrs_err_to_txt(err));
1980 retcode = check_net_options(tconn, new_conf);
1981 if (retcode != NO_ERROR)
1984 /* re-sync running */
1985 rsr = conn_resync_running(tconn);
1986 if (rsr && strcmp(new_conf->csums_alg, old_conf->csums_alg)) {
1987 retcode = ERR_CSUMS_RESYNC_RUNNING;
1991 /* online verify running */
1992 ovr = conn_ov_running(tconn);
1993 if (ovr && strcmp(new_conf->verify_alg, old_conf->verify_alg)) {
1994 retcode = ERR_VERIFY_RUNNING;
1998 retcode = alloc_crypto(&crypto, new_conf);
1999 if (retcode != NO_ERROR)
2002 rcu_assign_pointer(tconn->net_conf, new_conf);
2005 crypto_free_hash(tconn->csums_tfm);
2006 tconn->csums_tfm = crypto.csums_tfm;
2007 crypto.csums_tfm = NULL;
2010 crypto_free_hash(tconn->verify_tfm);
2011 tconn->verify_tfm = crypto.verify_tfm;
2012 crypto.verify_tfm = NULL;
2015 crypto_free_hash(tconn->integrity_tfm);
2016 tconn->integrity_tfm = crypto.integrity_tfm;
2017 if (tconn->cstate >= C_WF_REPORT_PARAMS && tconn->agreed_pro_version >= 100)
2018 /* Do this without trying to take tconn->data.mutex again. */
2019 __drbd_send_protocol(tconn, P_PROTOCOL_UPDATE);
2021 crypto_free_hash(tconn->cram_hmac_tfm);
2022 tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2024 mutex_unlock(&tconn->conf_update);
2025 mutex_unlock(&tconn->data.mutex);
2029 if (tconn->cstate >= C_WF_REPORT_PARAMS)
2030 drbd_send_sync_param(minor_to_mdev(conn_lowest_minor(tconn)));
2035 mutex_unlock(&tconn->conf_update);
2036 mutex_unlock(&tconn->data.mutex);
2037 free_crypto(&crypto);
2040 conn_reconfig_done(tconn);
2042 drbd_adm_finish(info, retcode);
2046 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
2048 struct drbd_conf *mdev;
2049 struct net_conf *old_conf, *new_conf = NULL;
2050 struct crypto crypto = { };
2051 struct drbd_tconn *tconn;
2052 enum drbd_ret_code retcode;
2056 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2058 if (!adm_ctx.reply_skb)
2060 if (retcode != NO_ERROR)
2062 if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
2063 drbd_msg_put_info("connection endpoint(s) missing");
2064 retcode = ERR_INVALID_REQUEST;
2068 /* No need for _rcu here. All reconfiguration is
2069 * strictly serialized on genl_lock(). We are protected against
2070 * concurrent reconfiguration/addition/deletion */
2071 list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
2072 if (nla_len(adm_ctx.my_addr) == tconn->my_addr_len &&
2073 !memcmp(nla_data(adm_ctx.my_addr), &tconn->my_addr, tconn->my_addr_len)) {
2074 retcode = ERR_LOCAL_ADDR;
2078 if (nla_len(adm_ctx.peer_addr) == tconn->peer_addr_len &&
2079 !memcmp(nla_data(adm_ctx.peer_addr), &tconn->peer_addr, tconn->peer_addr_len)) {
2080 retcode = ERR_PEER_ADDR;
2085 tconn = adm_ctx.tconn;
2086 conn_reconfig_start(tconn);
2088 if (tconn->cstate > C_STANDALONE) {
2089 retcode = ERR_NET_CONFIGURED;
2093 /* allocation not in the IO path, drbdsetup / netlink process context */
2094 new_conf = kzalloc(sizeof(*new_conf), GFP_KERNEL);
2096 retcode = ERR_NOMEM;
2100 set_net_conf_defaults(new_conf);
2102 err = net_conf_from_attrs(new_conf, info);
2103 if (err && err != -ENOMSG) {
2104 retcode = ERR_MANDATORY_TAG;
2105 drbd_msg_put_info(from_attrs_err_to_txt(err));
2109 retcode = check_net_options(tconn, new_conf);
2110 if (retcode != NO_ERROR)
2113 retcode = alloc_crypto(&crypto, new_conf);
2114 if (retcode != NO_ERROR)
2117 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2119 conn_flush_workqueue(tconn);
2121 mutex_lock(&tconn->conf_update);
2122 old_conf = tconn->net_conf;
2124 retcode = ERR_NET_CONFIGURED;
2125 mutex_unlock(&tconn->conf_update);
2128 rcu_assign_pointer(tconn->net_conf, new_conf);
2130 conn_free_crypto(tconn);
2131 tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2132 tconn->integrity_tfm = crypto.integrity_tfm;
2133 tconn->csums_tfm = crypto.csums_tfm;
2134 tconn->verify_tfm = crypto.verify_tfm;
2136 tconn->my_addr_len = nla_len(adm_ctx.my_addr);
2137 memcpy(&tconn->my_addr, nla_data(adm_ctx.my_addr), tconn->my_addr_len);
2138 tconn->peer_addr_len = nla_len(adm_ctx.peer_addr);
2139 memcpy(&tconn->peer_addr, nla_data(adm_ctx.peer_addr), tconn->peer_addr_len);
2141 mutex_unlock(&tconn->conf_update);
2144 idr_for_each_entry(&tconn->volumes, mdev, i) {
2150 retcode = conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2152 conn_reconfig_done(tconn);
2153 drbd_adm_finish(info, retcode);
2157 free_crypto(&crypto);
2160 conn_reconfig_done(tconn);
2162 drbd_adm_finish(info, retcode);
2166 static enum drbd_state_rv conn_try_disconnect(struct drbd_tconn *tconn, bool force)
2168 enum drbd_state_rv rv;
2170 rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2171 force ? CS_HARD : 0);
2174 case SS_NOTHING_TO_DO:
2176 case SS_ALREADY_STANDALONE:
2178 case SS_PRIMARY_NOP:
2179 /* Our state checking code wants to see the peer outdated. */
2180 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2181 pdsk, D_OUTDATED), CS_VERBOSE);
2183 case SS_CW_FAILED_BY_PEER:
2184 /* The peer probably wants to see us outdated. */
2185 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2186 disk, D_OUTDATED), 0);
2187 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2188 rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING),
2193 /* no special handling necessary */
2196 if (rv >= SS_SUCCESS) {
2197 enum drbd_state_rv rv2;
2198 /* No one else can reconfigure the network while I am here.
2199 * The state handling only uses drbd_thread_stop_nowait(),
2200 * we want to really wait here until the receiver is no more.
2202 drbd_thread_stop(&adm_ctx.tconn->receiver);
2204 /* Race breaker. This additional state change request may be
2205 * necessary, if this was a forced disconnect during a receiver
2206 * restart. We may have "killed" the receiver thread just
2207 * after drbdd_init() returned. Typically, we should be
2208 * C_STANDALONE already, now, and this becomes a no-op.
2210 rv2 = conn_request_state(tconn, NS(conn, C_STANDALONE),
2211 CS_VERBOSE | CS_HARD);
2212 if (rv2 < SS_SUCCESS)
2214 "unexpected rv2=%d in conn_try_disconnect()\n",
2220 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2222 struct disconnect_parms parms;
2223 struct drbd_tconn *tconn;
2224 enum drbd_state_rv rv;
2225 enum drbd_ret_code retcode;
2228 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONNECTION);
2229 if (!adm_ctx.reply_skb)
2231 if (retcode != NO_ERROR)
2234 tconn = adm_ctx.tconn;
2235 memset(&parms, 0, sizeof(parms));
2236 if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2237 err = disconnect_parms_from_attrs(&parms, info);
2239 retcode = ERR_MANDATORY_TAG;
2240 drbd_msg_put_info(from_attrs_err_to_txt(err));
2245 rv = conn_try_disconnect(tconn, parms.force_disconnect);
2246 if (rv < SS_SUCCESS)
2247 retcode = rv; /* FIXME: Type mismatch. */
2251 drbd_adm_finish(info, retcode);
2255 void resync_after_online_grow(struct drbd_conf *mdev)
2257 int iass; /* I am sync source */
2259 dev_info(DEV, "Resync of new storage after online grow\n");
2260 if (mdev->state.role != mdev->state.peer)
2261 iass = (mdev->state.role == R_PRIMARY);
2263 iass = test_bit(RESOLVE_CONFLICTS, &mdev->tconn->flags);
2266 drbd_start_resync(mdev, C_SYNC_SOURCE);
2268 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2271 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2273 struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
2274 struct resize_parms rs;
2275 struct drbd_conf *mdev;
2276 enum drbd_ret_code retcode;
2277 enum determine_dev_size dd;
2278 enum dds_flags ddsf;
2282 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2283 if (!adm_ctx.reply_skb)
2285 if (retcode != NO_ERROR)
2288 memset(&rs, 0, sizeof(struct resize_parms));
2289 if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2290 err = resize_parms_from_attrs(&rs, info);
2292 retcode = ERR_MANDATORY_TAG;
2293 drbd_msg_put_info(from_attrs_err_to_txt(err));
2298 mdev = adm_ctx.mdev;
2299 if (mdev->state.conn > C_CONNECTED) {
2300 retcode = ERR_RESIZE_RESYNC;
2304 if (mdev->state.role == R_SECONDARY &&
2305 mdev->state.peer == R_SECONDARY) {
2306 retcode = ERR_NO_PRIMARY;
2310 if (!get_ldev(mdev)) {
2311 retcode = ERR_NO_DISK;
2315 if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
2316 retcode = ERR_NEED_APV_93;
2321 u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
2323 if (u_size != (sector_t)rs.resize_size) {
2324 new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
2325 if (!new_disk_conf) {
2326 retcode = ERR_NOMEM;
2331 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
2332 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
2334 if (new_disk_conf) {
2335 mutex_lock(&mdev->tconn->conf_update);
2336 old_disk_conf = mdev->ldev->disk_conf;
2337 *new_disk_conf = *old_disk_conf;
2338 new_disk_conf->disk_size = (sector_t)rs.resize_size;
2339 rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
2340 mutex_unlock(&mdev->tconn->conf_update);
2342 kfree(old_disk_conf);
2345 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2346 dd = drbd_determine_dev_size(mdev, ddsf);
2349 if (dd == dev_size_error) {
2350 retcode = ERR_NOMEM_BITMAP;
2354 if (mdev->state.conn == C_CONNECTED) {
2356 set_bit(RESIZE_PENDING, &mdev->flags);
2358 drbd_send_uuids(mdev);
2359 drbd_send_sizes(mdev, 1, ddsf);
2363 drbd_adm_finish(info, retcode);
2371 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2373 enum drbd_ret_code retcode;
2374 struct drbd_tconn *tconn;
2375 struct res_opts res_opts;
2378 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
2379 if (!adm_ctx.reply_skb)
2381 if (retcode != NO_ERROR)
2383 tconn = adm_ctx.tconn;
2385 res_opts = tconn->res_opts;
2386 if (should_set_defaults(info))
2387 set_res_opts_defaults(&res_opts);
2389 err = res_opts_from_attrs(&res_opts, info);
2390 if (err && err != -ENOMSG) {
2391 retcode = ERR_MANDATORY_TAG;
2392 drbd_msg_put_info(from_attrs_err_to_txt(err));
2396 err = set_resource_options(tconn, &res_opts);
2398 retcode = ERR_INVALID_REQUEST;
2400 retcode = ERR_NOMEM;
2404 drbd_adm_finish(info, retcode);
2408 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2410 struct drbd_conf *mdev;
2411 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2413 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2414 if (!adm_ctx.reply_skb)
2416 if (retcode != NO_ERROR)
2419 mdev = adm_ctx.mdev;
2421 /* If there is still bitmap IO pending, probably because of a previous
2422 * resync just being finished, wait for it before requesting a new resync.
2423 * Also wait for it's after_state_ch(). */
2424 drbd_suspend_io(mdev);
2425 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2426 drbd_flush_workqueue(mdev);
2428 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
2430 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
2431 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2433 while (retcode == SS_NEED_CONNECTION) {
2434 spin_lock_irq(&mdev->tconn->req_lock);
2435 if (mdev->state.conn < C_CONNECTED)
2436 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
2437 spin_unlock_irq(&mdev->tconn->req_lock);
2439 if (retcode != SS_NEED_CONNECTION)
2442 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2444 drbd_resume_io(mdev);
2447 drbd_adm_finish(info, retcode);
2451 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2452 union drbd_state mask, union drbd_state val)
2454 enum drbd_ret_code retcode;
2456 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2457 if (!adm_ctx.reply_skb)
2459 if (retcode != NO_ERROR)
2462 retcode = drbd_request_state(adm_ctx.mdev, mask, val);
2464 drbd_adm_finish(info, retcode);
2468 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
2472 rv = drbd_bmio_set_n_write(mdev);
2473 drbd_suspend_al(mdev);
2477 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
2479 int retcode; /* drbd_ret_code, drbd_state_rv */
2480 struct drbd_conf *mdev;
2482 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2483 if (!adm_ctx.reply_skb)
2485 if (retcode != NO_ERROR)
2488 mdev = adm_ctx.mdev;
2490 /* If there is still bitmap IO pending, probably because of a previous
2491 * resync just being finished, wait for it before requesting a new resync.
2492 * Also wait for it's after_state_ch(). */
2493 drbd_suspend_io(mdev);
2494 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2495 drbd_flush_workqueue(mdev);
2497 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
2498 if (retcode < SS_SUCCESS) {
2499 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
2500 /* The peer will get a resync upon connect anyways.
2501 * Just make that into a full resync. */
2502 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
2503 if (retcode >= SS_SUCCESS) {
2504 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
2505 "set_n_write from invalidate_peer",
2506 BM_LOCKED_SET_ALLOWED))
2507 retcode = ERR_IO_MD_DISK;
2510 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
2512 drbd_resume_io(mdev);
2515 drbd_adm_finish(info, retcode);
2519 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2521 enum drbd_ret_code retcode;
2523 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2524 if (!adm_ctx.reply_skb)
2526 if (retcode != NO_ERROR)
2529 if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2530 retcode = ERR_PAUSE_IS_SET;
2532 drbd_adm_finish(info, retcode);
2536 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
2538 union drbd_dev_state s;
2539 enum drbd_ret_code retcode;
2541 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2542 if (!adm_ctx.reply_skb)
2544 if (retcode != NO_ERROR)
2547 if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2548 s = adm_ctx.mdev->state;
2549 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2550 retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2551 s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2553 retcode = ERR_PAUSE_IS_CLEAR;
2558 drbd_adm_finish(info, retcode);
2562 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
2564 return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
2567 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
2569 struct drbd_conf *mdev;
2570 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2572 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2573 if (!adm_ctx.reply_skb)
2575 if (retcode != NO_ERROR)
2578 mdev = adm_ctx.mdev;
2579 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2580 drbd_uuid_new_current(mdev);
2581 clear_bit(NEW_CUR_UUID, &mdev->flags);
2583 drbd_suspend_io(mdev);
2584 retcode = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2585 if (retcode == SS_SUCCESS) {
2586 if (mdev->state.conn < C_CONNECTED)
2587 tl_clear(mdev->tconn);
2588 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2589 tl_restart(mdev->tconn, FAIL_FROZEN_DISK_IO);
2591 drbd_resume_io(mdev);
2594 drbd_adm_finish(info, retcode);
2598 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
2600 return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
2603 int nla_put_drbd_cfg_context(struct sk_buff *skb, struct drbd_tconn *tconn, unsigned vnr)
2606 nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2608 goto nla_put_failure;
2609 if (vnr != VOLUME_UNSPECIFIED &&
2610 nla_put_u32(skb, T_ctx_volume, vnr))
2611 goto nla_put_failure;
2612 if (nla_put_string(skb, T_ctx_resource_name, tconn->name))
2613 goto nla_put_failure;
2614 if (tconn->my_addr_len &&
2615 nla_put(skb, T_ctx_my_addr, tconn->my_addr_len, &tconn->my_addr))
2616 goto nla_put_failure;
2617 if (tconn->peer_addr_len &&
2618 nla_put(skb, T_ctx_peer_addr, tconn->peer_addr_len, &tconn->peer_addr))
2619 goto nla_put_failure;
2620 nla_nest_end(skb, nla);
2625 nla_nest_cancel(skb, nla);
2629 int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
2630 const struct sib_info *sib)
2632 struct state_info *si = NULL; /* for sizeof(si->member); */
2633 struct net_conf *nc;
2637 int exclude_sensitive;
2639 /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2640 * to. So we better exclude_sensitive information.
2642 * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2643 * in the context of the requesting user process. Exclude sensitive
2644 * information, unless current has superuser.
2646 * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2647 * relies on the current implementation of netlink_dump(), which
2648 * executes the dump callback successively from netlink_recvmsg(),
2649 * always in the context of the receiving process */
2650 exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2652 got_ldev = get_ldev(mdev);
2654 /* We need to add connection name and volume number information still.
2655 * Minor number is in drbd_genlmsghdr. */
2656 if (nla_put_drbd_cfg_context(skb, mdev->tconn, mdev->vnr))
2657 goto nla_put_failure;
2659 if (res_opts_to_skb(skb, &mdev->tconn->res_opts, exclude_sensitive))
2660 goto nla_put_failure;
2664 if (disk_conf_to_skb(skb, rcu_dereference(mdev->ldev->disk_conf), exclude_sensitive))
2665 goto nla_put_failure;
2667 nc = rcu_dereference(mdev->tconn->net_conf);
2669 err = net_conf_to_skb(skb, nc, exclude_sensitive);
2672 goto nla_put_failure;
2674 nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2676 goto nla_put_failure;
2677 if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
2678 nla_put_u32(skb, T_current_state, mdev->state.i) ||
2679 nla_put_u64(skb, T_ed_uuid, mdev->ed_uuid) ||
2680 nla_put_u64(skb, T_capacity, drbd_get_capacity(mdev->this_bdev)) ||
2681 nla_put_u64(skb, T_send_cnt, mdev->send_cnt) ||
2682 nla_put_u64(skb, T_recv_cnt, mdev->recv_cnt) ||
2683 nla_put_u64(skb, T_read_cnt, mdev->read_cnt) ||
2684 nla_put_u64(skb, T_writ_cnt, mdev->writ_cnt) ||
2685 nla_put_u64(skb, T_al_writ_cnt, mdev->al_writ_cnt) ||
2686 nla_put_u64(skb, T_bm_writ_cnt, mdev->bm_writ_cnt) ||
2687 nla_put_u32(skb, T_ap_bio_cnt, atomic_read(&mdev->ap_bio_cnt)) ||
2688 nla_put_u32(skb, T_ap_pending_cnt, atomic_read(&mdev->ap_pending_cnt)) ||
2689 nla_put_u32(skb, T_rs_pending_cnt, atomic_read(&mdev->rs_pending_cnt)))
2690 goto nla_put_failure;
2695 spin_lock_irq(&mdev->ldev->md.uuid_lock);
2696 err = nla_put(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid);
2697 spin_unlock_irq(&mdev->ldev->md.uuid_lock);
2700 goto nla_put_failure;
2702 if (nla_put_u32(skb, T_disk_flags, mdev->ldev->md.flags) ||
2703 nla_put_u64(skb, T_bits_total, drbd_bm_bits(mdev)) ||
2704 nla_put_u64(skb, T_bits_oos, drbd_bm_total_weight(mdev)))
2705 goto nla_put_failure;
2706 if (C_SYNC_SOURCE <= mdev->state.conn &&
2707 C_PAUSED_SYNC_T >= mdev->state.conn) {
2708 if (nla_put_u64(skb, T_bits_rs_total, mdev->rs_total) ||
2709 nla_put_u64(skb, T_bits_rs_failed, mdev->rs_failed))
2710 goto nla_put_failure;
2715 switch(sib->sib_reason) {
2716 case SIB_SYNC_PROGRESS:
2717 case SIB_GET_STATUS_REPLY:
2719 case SIB_STATE_CHANGE:
2720 if (nla_put_u32(skb, T_prev_state, sib->os.i) ||
2721 nla_put_u32(skb, T_new_state, sib->ns.i))
2722 goto nla_put_failure;
2724 case SIB_HELPER_POST:
2725 if (nla_put_u32(skb, T_helper_exit_code,
2726 sib->helper_exit_code))
2727 goto nla_put_failure;
2729 case SIB_HELPER_PRE:
2730 if (nla_put_string(skb, T_helper, sib->helper_name))
2731 goto nla_put_failure;
2735 nla_nest_end(skb, nla);
2745 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
2747 enum drbd_ret_code retcode;
2750 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2751 if (!adm_ctx.reply_skb)
2753 if (retcode != NO_ERROR)
2756 err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.mdev, NULL);
2758 nlmsg_free(adm_ctx.reply_skb);
2762 drbd_adm_finish(info, retcode);
2766 int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
2768 struct drbd_conf *mdev;
2769 struct drbd_genlmsghdr *dh;
2770 struct drbd_tconn *pos = (struct drbd_tconn*)cb->args[0];
2771 struct drbd_tconn *tconn = NULL;
2772 struct drbd_tconn *tmp;
2773 unsigned volume = cb->args[1];
2775 /* Open coded, deferred, iteration:
2776 * list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
2777 * idr_for_each_entry(&tconn->volumes, mdev, i) {
2781 * where tconn is cb->args[0];
2782 * and i is cb->args[1];
2784 * cb->args[2] indicates if we shall loop over all resources,
2785 * or just dump all volumes of a single resource.
2787 * This may miss entries inserted after this dump started,
2788 * or entries deleted before they are reached.
2790 * We need to make sure the mdev won't disappear while
2791 * we are looking at it, and revalidate our iterators
2792 * on each iteration.
2795 /* synchronize with conn_create()/conn_destroy() */
2797 /* revalidate iterator position */
2798 list_for_each_entry_rcu(tmp, &drbd_tconns, all_tconn) {
2800 /* first iteration */
2812 mdev = idr_get_next(&tconn->volumes, &volume);
2814 /* No more volumes to dump on this tconn.
2815 * Advance tconn iterator. */
2816 pos = list_entry_rcu(tconn->all_tconn.next,
2817 struct drbd_tconn, all_tconn);
2818 /* Did we dump any volume on this tconn yet? */
2820 /* If we reached the end of the list,
2821 * or only a single resource dump was requested,
2823 if (&pos->all_tconn == &drbd_tconns || cb->args[2])
2831 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
2832 cb->nlh->nlmsg_seq, &drbd_genl_family,
2833 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
2838 /* This is a tconn without a single volume.
2839 * Suprisingly enough, it may have a network
2841 struct net_conf *nc;
2843 dh->ret_code = NO_ERROR;
2844 if (nla_put_drbd_cfg_context(skb, tconn, VOLUME_UNSPECIFIED))
2846 nc = rcu_dereference(tconn->net_conf);
2847 if (nc && net_conf_to_skb(skb, nc, 1) != 0)
2852 D_ASSERT(mdev->vnr == volume);
2853 D_ASSERT(mdev->tconn == tconn);
2855 dh->minor = mdev_to_minor(mdev);
2856 dh->ret_code = NO_ERROR;
2858 if (nla_put_status_info(skb, mdev, NULL)) {
2860 genlmsg_cancel(skb, dh);
2864 genlmsg_end(skb, dh);
2869 /* where to start the next iteration */
2870 cb->args[0] = (long)pos;
2871 cb->args[1] = (pos == tconn) ? volume + 1 : 0;
2873 /* No more tconns/volumes/minors found results in an empty skb.
2874 * Which will terminate the dump. */
2879 * Request status of all resources, or of all volumes within a single resource.
2881 * This is a dump, as the answer may not fit in a single reply skb otherwise.
2882 * Which means we cannot use the family->attrbuf or other such members, because
2883 * dump is NOT protected by the genl_lock(). During dump, we only have access
2884 * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
2886 * Once things are setup properly, we call into get_one_status().
2888 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
2890 const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
2892 const char *resource_name;
2893 struct drbd_tconn *tconn;
2896 /* Is this a followup call? */
2898 /* ... of a single resource dump,
2899 * and the resource iterator has been advanced already? */
2900 if (cb->args[2] && cb->args[2] != cb->args[0])
2901 return 0; /* DONE. */
2905 /* First call (from netlink_dump_start). We need to figure out
2906 * which resource(s) the user wants us to dump. */
2907 nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
2908 nlmsg_attrlen(cb->nlh, hdrlen),
2909 DRBD_NLA_CFG_CONTEXT);
2911 /* No explicit context given. Dump all. */
2914 maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
2915 nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
2917 return PTR_ERR(nla);
2918 /* context given, but no name present? */
2921 resource_name = nla_data(nla);
2922 tconn = conn_get_by_name(resource_name);
2927 kref_put(&tconn->kref, &conn_destroy); /* get_one_status() (re)validates tconn by itself */
2929 /* prime iterators, and set "filter" mode mark:
2930 * only dump this tconn. */
2931 cb->args[0] = (long)tconn;
2932 /* cb->args[1] = 0; passed in this way. */
2933 cb->args[2] = (long)tconn;
2936 return get_one_status(skb, cb);
2939 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
2941 enum drbd_ret_code retcode;
2942 struct timeout_parms tp;
2945 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2946 if (!adm_ctx.reply_skb)
2948 if (retcode != NO_ERROR)
2952 adm_ctx.mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2953 test_bit(USE_DEGR_WFC_T, &adm_ctx.mdev->flags) ? UT_DEGRADED :
2956 err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
2958 nlmsg_free(adm_ctx.reply_skb);
2962 drbd_adm_finish(info, retcode);
2966 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
2968 struct drbd_conf *mdev;
2969 enum drbd_ret_code retcode;
2970 struct start_ov_parms parms;
2972 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2973 if (!adm_ctx.reply_skb)
2975 if (retcode != NO_ERROR)
2978 mdev = adm_ctx.mdev;
2980 /* resume from last known position, if possible */
2981 parms.ov_start_sector = mdev->ov_start_sector;
2982 parms.ov_stop_sector = ULLONG_MAX;
2983 if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
2984 int err = start_ov_parms_from_attrs(&parms, info);
2986 retcode = ERR_MANDATORY_TAG;
2987 drbd_msg_put_info(from_attrs_err_to_txt(err));
2991 /* w_make_ov_request expects position to be aligned */
2992 mdev->ov_start_sector = parms.ov_start_sector & ~(BM_SECT_PER_BIT-1);
2993 mdev->ov_stop_sector = parms.ov_stop_sector;
2995 /* If there is still bitmap IO pending, e.g. previous resync or verify
2996 * just being finished, wait for it before requesting a new resync. */
2997 drbd_suspend_io(mdev);
2998 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2999 retcode = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
3000 drbd_resume_io(mdev);
3002 drbd_adm_finish(info, retcode);
3007 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
3009 struct drbd_conf *mdev;
3010 enum drbd_ret_code retcode;
3011 int skip_initial_sync = 0;
3013 struct new_c_uuid_parms args;
3015 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3016 if (!adm_ctx.reply_skb)
3018 if (retcode != NO_ERROR)
3021 mdev = adm_ctx.mdev;
3022 memset(&args, 0, sizeof(args));
3023 if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
3024 err = new_c_uuid_parms_from_attrs(&args, info);
3026 retcode = ERR_MANDATORY_TAG;
3027 drbd_msg_put_info(from_attrs_err_to_txt(err));
3032 mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
3034 if (!get_ldev(mdev)) {
3035 retcode = ERR_NO_DISK;
3039 /* this is "skip initial sync", assume to be clean */
3040 if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
3041 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
3042 dev_info(DEV, "Preparing to skip initial sync\n");
3043 skip_initial_sync = 1;
3044 } else if (mdev->state.conn != C_STANDALONE) {
3045 retcode = ERR_CONNECTED;
3049 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
3050 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
3052 if (args.clear_bm) {
3053 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
3054 "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
3056 dev_err(DEV, "Writing bitmap failed with %d\n",err);
3057 retcode = ERR_IO_MD_DISK;
3059 if (skip_initial_sync) {
3060 drbd_send_uuids_skip_initial_sync(mdev);
3061 _drbd_uuid_set(mdev, UI_BITMAP, 0);
3062 drbd_print_uuids(mdev, "cleared bitmap UUID");
3063 spin_lock_irq(&mdev->tconn->req_lock);
3064 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3066 spin_unlock_irq(&mdev->tconn->req_lock);
3074 mutex_unlock(mdev->state_mutex);
3076 drbd_adm_finish(info, retcode);
3080 static enum drbd_ret_code
3081 drbd_check_resource_name(const char *name)
3083 if (!name || !name[0]) {
3084 drbd_msg_put_info("resource name missing");
3085 return ERR_MANDATORY_TAG;
3087 /* if we want to use these in sysfs/configfs/debugfs some day,
3088 * we must not allow slashes */
3089 if (strchr(name, '/')) {
3090 drbd_msg_put_info("invalid resource name");
3091 return ERR_INVALID_REQUEST;
3096 int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
3098 enum drbd_ret_code retcode;
3099 struct res_opts res_opts;
3102 retcode = drbd_adm_prepare(skb, info, 0);
3103 if (!adm_ctx.reply_skb)
3105 if (retcode != NO_ERROR)
3108 set_res_opts_defaults(&res_opts);
3109 err = res_opts_from_attrs(&res_opts, info);
3110 if (err && err != -ENOMSG) {
3111 retcode = ERR_MANDATORY_TAG;
3112 drbd_msg_put_info(from_attrs_err_to_txt(err));
3116 retcode = drbd_check_resource_name(adm_ctx.resource_name);
3117 if (retcode != NO_ERROR)
3120 if (adm_ctx.tconn) {
3121 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
3122 retcode = ERR_INVALID_REQUEST;
3123 drbd_msg_put_info("resource exists");
3125 /* else: still NO_ERROR */
3129 if (!conn_create(adm_ctx.resource_name, &res_opts))
3130 retcode = ERR_NOMEM;
3132 drbd_adm_finish(info, retcode);
3136 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info)
3138 struct drbd_genlmsghdr *dh = info->userhdr;
3139 enum drbd_ret_code retcode;
3141 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3142 if (!adm_ctx.reply_skb)
3144 if (retcode != NO_ERROR)
3147 if (dh->minor > MINORMASK) {
3148 drbd_msg_put_info("requested minor out of range");
3149 retcode = ERR_INVALID_REQUEST;
3152 if (adm_ctx.volume > DRBD_VOLUME_MAX) {
3153 drbd_msg_put_info("requested volume id out of range");
3154 retcode = ERR_INVALID_REQUEST;
3158 /* drbd_adm_prepare made sure already
3159 * that mdev->tconn and mdev->vnr match the request. */
3161 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3162 retcode = ERR_MINOR_EXISTS;
3163 /* else: still NO_ERROR */
3167 retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume);
3169 drbd_adm_finish(info, retcode);
3173 static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
3175 if (mdev->state.disk == D_DISKLESS &&
3176 /* no need to be mdev->state.conn == C_STANDALONE &&
3177 * we may want to delete a minor from a live replication group.
3179 mdev->state.role == R_SECONDARY) {
3180 _drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS),
3181 CS_VERBOSE + CS_WAIT_COMPLETE);
3182 idr_remove(&mdev->tconn->volumes, mdev->vnr);
3183 idr_remove(&minors, mdev_to_minor(mdev));
3184 del_gendisk(mdev->vdisk);
3186 kref_put(&mdev->kref, &drbd_minor_destroy);
3189 return ERR_MINOR_CONFIGURED;
3192 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info)
3194 enum drbd_ret_code retcode;
3196 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3197 if (!adm_ctx.reply_skb)
3199 if (retcode != NO_ERROR)
3202 retcode = adm_delete_minor(adm_ctx.mdev);
3204 drbd_adm_finish(info, retcode);
3208 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3210 int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
3211 struct drbd_conf *mdev;
3214 retcode = drbd_adm_prepare(skb, info, 0);
3215 if (!adm_ctx.reply_skb)
3217 if (retcode != NO_ERROR)
3220 if (!adm_ctx.tconn) {
3221 retcode = ERR_RES_NOT_KNOWN;
3226 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3227 retcode = drbd_set_role(mdev, R_SECONDARY, 0);
3228 if (retcode < SS_SUCCESS) {
3229 drbd_msg_put_info("failed to demote");
3234 retcode = conn_try_disconnect(adm_ctx.tconn, 0);
3235 if (retcode < SS_SUCCESS) {
3236 drbd_msg_put_info("failed to disconnect");
3241 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3242 retcode = adm_detach(mdev, 0);
3243 if (retcode < SS_SUCCESS || retcode > NO_ERROR) {
3244 drbd_msg_put_info("failed to detach");
3249 /* If we reach this, all volumes (of this tconn) are Secondary,
3250 * Disconnected, Diskless, aka Unconfigured. Make sure all threads have
3251 * actually stopped, state handling only does drbd_thread_stop_nowait(). */
3252 drbd_thread_stop(&adm_ctx.tconn->worker);
3254 /* Now, nothing can fail anymore */
3256 /* delete volumes */
3257 idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3258 retcode = adm_delete_minor(mdev);
3259 if (retcode != NO_ERROR) {
3260 /* "can not happen" */
3261 drbd_msg_put_info("failed to delete volume");
3266 /* delete connection */
3267 if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3268 list_del_rcu(&adm_ctx.tconn->all_tconn);
3270 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3274 /* "can not happen" */
3275 retcode = ERR_RES_IN_USE;
3276 drbd_msg_put_info("failed to delete connection");
3280 drbd_adm_finish(info, retcode);
3284 int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
3286 enum drbd_ret_code retcode;
3288 retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
3289 if (!adm_ctx.reply_skb)
3291 if (retcode != NO_ERROR)
3294 if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3295 list_del_rcu(&adm_ctx.tconn->all_tconn);
3297 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3301 retcode = ERR_RES_IN_USE;
3304 if (retcode == NO_ERROR)
3305 drbd_thread_stop(&adm_ctx.tconn->worker);
3307 drbd_adm_finish(info, retcode);
3311 void drbd_bcast_event(struct drbd_conf *mdev, const struct sib_info *sib)
3313 static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3314 struct sk_buff *msg;
3315 struct drbd_genlmsghdr *d_out;
3319 if (sib->sib_reason == SIB_SYNC_PROGRESS) {
3320 if (time_after(jiffies, mdev->rs_last_bcast + HZ))
3321 mdev->rs_last_bcast = jiffies;
3326 seq = atomic_inc_return(&drbd_genl_seq);
3327 msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3332 d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3333 if (!d_out) /* cannot happen, but anyways. */
3334 goto nla_put_failure;
3335 d_out->minor = mdev_to_minor(mdev);
3336 d_out->ret_code = NO_ERROR;
3338 if (nla_put_status_info(msg, mdev, sib))
3339 goto nla_put_failure;
3340 genlmsg_end(msg, d_out);
3341 err = drbd_genl_multicast_events(msg, 0);
3342 /* msg has been consumed or freed in netlink_broadcast() */
3343 if (err && err != -ESRCH)
3351 dev_err(DEV, "Error %d while broadcasting event. "
3352 "Event seq:%u sib_reason:%u\n",
3353 err, seq, sib->sib_reason);