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>
28 #include <linux/uaccess.h>
31 #include <linux/drbd.h>
33 #include <linux/file.h>
36 #include <linux/memcontrol.h>
37 #include <linux/mm_inline.h>
38 #include <linux/slab.h>
39 #include <uapi/linux/sched/types.h>
40 #include <linux/sched/signal.h>
41 #include <linux/pkt_sched.h>
42 #define __KERNEL_SYSCALLS__
43 #include <linux/unistd.h>
44 #include <linux/vmalloc.h>
45 #include <linux/random.h>
46 #include <linux/string.h>
47 #include <linux/scatterlist.h>
49 #include "drbd_protocol.h"
53 #define PRO_FEATURES (DRBD_FF_TRIM|DRBD_FF_THIN_RESYNC|DRBD_FF_WSAME)
68 static int drbd_do_features(struct drbd_connection *connection);
69 static int drbd_do_auth(struct drbd_connection *connection);
70 static int drbd_disconnected(struct drbd_peer_device *);
71 static void conn_wait_active_ee_empty(struct drbd_connection *connection);
72 static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *, struct drbd_epoch *, enum epoch_event);
73 static int e_end_block(struct drbd_work *, int);
76 #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN)
79 * some helper functions to deal with single linked page lists,
80 * page->private being our "next" pointer.
83 /* If at least n pages are linked at head, get n pages off.
84 * Otherwise, don't modify head, and return NULL.
85 * Locking is the responsibility of the caller.
87 static struct page *page_chain_del(struct page **head, int n)
101 tmp = page_chain_next(page);
103 break; /* found sufficient pages */
105 /* insufficient pages, don't use any of them. */
110 /* add end of list marker for the returned list */
111 set_page_private(page, 0);
112 /* actual return value, and adjustment of head */
118 /* may be used outside of locks to find the tail of a (usually short)
119 * "private" page chain, before adding it back to a global chain head
120 * with page_chain_add() under a spinlock. */
121 static struct page *page_chain_tail(struct page *page, int *len)
125 while ((tmp = page_chain_next(page)))
132 static int page_chain_free(struct page *page)
136 page_chain_for_each_safe(page, tmp) {
143 static void page_chain_add(struct page **head,
144 struct page *chain_first, struct page *chain_last)
148 tmp = page_chain_tail(chain_first, NULL);
149 BUG_ON(tmp != chain_last);
152 /* add chain to head */
153 set_page_private(chain_last, (unsigned long)*head);
157 static struct page *__drbd_alloc_pages(struct drbd_device *device,
160 struct page *page = NULL;
161 struct page *tmp = NULL;
164 /* Yes, testing drbd_pp_vacant outside the lock is racy.
165 * So what. It saves a spin_lock. */
166 if (drbd_pp_vacant >= number) {
167 spin_lock(&drbd_pp_lock);
168 page = page_chain_del(&drbd_pp_pool, number);
170 drbd_pp_vacant -= number;
171 spin_unlock(&drbd_pp_lock);
176 /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD
177 * "criss-cross" setup, that might cause write-out on some other DRBD,
178 * which in turn might block on the other node at this very place. */
179 for (i = 0; i < number; i++) {
180 tmp = alloc_page(GFP_TRY);
183 set_page_private(tmp, (unsigned long)page);
190 /* Not enough pages immediately available this time.
191 * No need to jump around here, drbd_alloc_pages will retry this
192 * function "soon". */
194 tmp = page_chain_tail(page, NULL);
195 spin_lock(&drbd_pp_lock);
196 page_chain_add(&drbd_pp_pool, page, tmp);
198 spin_unlock(&drbd_pp_lock);
203 static void reclaim_finished_net_peer_reqs(struct drbd_device *device,
204 struct list_head *to_be_freed)
206 struct drbd_peer_request *peer_req, *tmp;
208 /* The EEs are always appended to the end of the list. Since
209 they are sent in order over the wire, they have to finish
210 in order. As soon as we see the first not finished we can
211 stop to examine the list... */
213 list_for_each_entry_safe(peer_req, tmp, &device->net_ee, w.list) {
214 if (drbd_peer_req_has_active_page(peer_req))
216 list_move(&peer_req->w.list, to_be_freed);
220 static void drbd_reclaim_net_peer_reqs(struct drbd_device *device)
222 LIST_HEAD(reclaimed);
223 struct drbd_peer_request *peer_req, *t;
225 spin_lock_irq(&device->resource->req_lock);
226 reclaim_finished_net_peer_reqs(device, &reclaimed);
227 spin_unlock_irq(&device->resource->req_lock);
228 list_for_each_entry_safe(peer_req, t, &reclaimed, w.list)
229 drbd_free_net_peer_req(device, peer_req);
232 static void conn_reclaim_net_peer_reqs(struct drbd_connection *connection)
234 struct drbd_peer_device *peer_device;
238 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
239 struct drbd_device *device = peer_device->device;
240 if (!atomic_read(&device->pp_in_use_by_net))
243 kref_get(&device->kref);
245 drbd_reclaim_net_peer_reqs(device);
246 kref_put(&device->kref, drbd_destroy_device);
253 * drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled)
254 * @device: DRBD device.
255 * @number: number of pages requested
256 * @retry: whether to retry, if not enough pages are available right now
258 * Tries to allocate number pages, first from our own page pool, then from
260 * Possibly retry until DRBD frees sufficient pages somewhere else.
262 * If this allocation would exceed the max_buffers setting, we throttle
263 * allocation (schedule_timeout) to give the system some room to breathe.
265 * We do not use max-buffers as hard limit, because it could lead to
266 * congestion and further to a distributed deadlock during online-verify or
267 * (checksum based) resync, if the max-buffers, socket buffer sizes and
268 * resync-rate settings are mis-configured.
270 * Returns a page chain linked via page->private.
272 struct page *drbd_alloc_pages(struct drbd_peer_device *peer_device, unsigned int number,
275 struct drbd_device *device = peer_device->device;
276 struct page *page = NULL;
282 nc = rcu_dereference(peer_device->connection->net_conf);
283 mxb = nc ? nc->max_buffers : 1000000;
286 if (atomic_read(&device->pp_in_use) < mxb)
287 page = __drbd_alloc_pages(device, number);
289 /* Try to keep the fast path fast, but occasionally we need
290 * to reclaim the pages we lended to the network stack. */
291 if (page && atomic_read(&device->pp_in_use_by_net) > 512)
292 drbd_reclaim_net_peer_reqs(device);
294 while (page == NULL) {
295 prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE);
297 drbd_reclaim_net_peer_reqs(device);
299 if (atomic_read(&device->pp_in_use) < mxb) {
300 page = __drbd_alloc_pages(device, number);
308 if (signal_pending(current)) {
309 drbd_warn(device, "drbd_alloc_pages interrupted!\n");
313 if (schedule_timeout(HZ/10) == 0)
316 finish_wait(&drbd_pp_wait, &wait);
319 atomic_add(number, &device->pp_in_use);
323 /* Must not be used from irq, as that may deadlock: see drbd_alloc_pages.
324 * Is also used from inside an other spin_lock_irq(&resource->req_lock);
325 * Either links the page chain back to the global pool,
326 * or returns all pages to the system. */
327 static void drbd_free_pages(struct drbd_device *device, struct page *page, int is_net)
329 atomic_t *a = is_net ? &device->pp_in_use_by_net : &device->pp_in_use;
335 if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count)
336 i = page_chain_free(page);
339 tmp = page_chain_tail(page, &i);
340 spin_lock(&drbd_pp_lock);
341 page_chain_add(&drbd_pp_pool, page, tmp);
343 spin_unlock(&drbd_pp_lock);
345 i = atomic_sub_return(i, a);
347 drbd_warn(device, "ASSERTION FAILED: %s: %d < 0\n",
348 is_net ? "pp_in_use_by_net" : "pp_in_use", i);
349 wake_up(&drbd_pp_wait);
353 You need to hold the req_lock:
354 _drbd_wait_ee_list_empty()
356 You must not have the req_lock:
358 drbd_alloc_peer_req()
359 drbd_free_peer_reqs()
361 drbd_finish_peer_reqs()
363 drbd_wait_ee_list_empty()
366 /* normal: payload_size == request size (bi_size)
367 * w_same: payload_size == logical_block_size
368 * trim: payload_size == 0 */
369 struct drbd_peer_request *
370 drbd_alloc_peer_req(struct drbd_peer_device *peer_device, u64 id, sector_t sector,
371 unsigned int request_size, unsigned int payload_size, gfp_t gfp_mask) __must_hold(local)
373 struct drbd_device *device = peer_device->device;
374 struct drbd_peer_request *peer_req;
375 struct page *page = NULL;
376 unsigned nr_pages = (payload_size + PAGE_SIZE -1) >> PAGE_SHIFT;
378 if (drbd_insert_fault(device, DRBD_FAULT_AL_EE))
381 peer_req = mempool_alloc(&drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM);
383 if (!(gfp_mask & __GFP_NOWARN))
384 drbd_err(device, "%s: allocation failed\n", __func__);
389 page = drbd_alloc_pages(peer_device, nr_pages,
390 gfpflags_allow_blocking(gfp_mask));
395 memset(peer_req, 0, sizeof(*peer_req));
396 INIT_LIST_HEAD(&peer_req->w.list);
397 drbd_clear_interval(&peer_req->i);
398 peer_req->i.size = request_size;
399 peer_req->i.sector = sector;
400 peer_req->submit_jif = jiffies;
401 peer_req->peer_device = peer_device;
402 peer_req->pages = page;
404 * The block_id is opaque to the receiver. It is not endianness
405 * converted, and sent back to the sender unchanged.
407 peer_req->block_id = id;
412 mempool_free(peer_req, &drbd_ee_mempool);
416 void __drbd_free_peer_req(struct drbd_device *device, struct drbd_peer_request *peer_req,
420 if (peer_req->flags & EE_HAS_DIGEST)
421 kfree(peer_req->digest);
422 drbd_free_pages(device, peer_req->pages, is_net);
423 D_ASSERT(device, atomic_read(&peer_req->pending_bios) == 0);
424 D_ASSERT(device, drbd_interval_empty(&peer_req->i));
425 if (!expect(!(peer_req->flags & EE_CALL_AL_COMPLETE_IO))) {
426 peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO;
427 drbd_al_complete_io(device, &peer_req->i);
429 mempool_free(peer_req, &drbd_ee_mempool);
432 int drbd_free_peer_reqs(struct drbd_device *device, struct list_head *list)
434 LIST_HEAD(work_list);
435 struct drbd_peer_request *peer_req, *t;
437 int is_net = list == &device->net_ee;
439 spin_lock_irq(&device->resource->req_lock);
440 list_splice_init(list, &work_list);
441 spin_unlock_irq(&device->resource->req_lock);
443 list_for_each_entry_safe(peer_req, t, &work_list, w.list) {
444 __drbd_free_peer_req(device, peer_req, is_net);
451 * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier.
453 static int drbd_finish_peer_reqs(struct drbd_device *device)
455 LIST_HEAD(work_list);
456 LIST_HEAD(reclaimed);
457 struct drbd_peer_request *peer_req, *t;
460 spin_lock_irq(&device->resource->req_lock);
461 reclaim_finished_net_peer_reqs(device, &reclaimed);
462 list_splice_init(&device->done_ee, &work_list);
463 spin_unlock_irq(&device->resource->req_lock);
465 list_for_each_entry_safe(peer_req, t, &reclaimed, w.list)
466 drbd_free_net_peer_req(device, peer_req);
468 /* possible callbacks here:
469 * e_end_block, and e_end_resync_block, e_send_superseded.
470 * all ignore the last argument.
472 list_for_each_entry_safe(peer_req, t, &work_list, w.list) {
475 /* list_del not necessary, next/prev members not touched */
476 err2 = peer_req->w.cb(&peer_req->w, !!err);
479 drbd_free_peer_req(device, peer_req);
481 wake_up(&device->ee_wait);
486 static void _drbd_wait_ee_list_empty(struct drbd_device *device,
487 struct list_head *head)
491 /* avoids spin_lock/unlock
492 * and calling prepare_to_wait in the fast path */
493 while (!list_empty(head)) {
494 prepare_to_wait(&device->ee_wait, &wait, TASK_UNINTERRUPTIBLE);
495 spin_unlock_irq(&device->resource->req_lock);
497 finish_wait(&device->ee_wait, &wait);
498 spin_lock_irq(&device->resource->req_lock);
502 static void drbd_wait_ee_list_empty(struct drbd_device *device,
503 struct list_head *head)
505 spin_lock_irq(&device->resource->req_lock);
506 _drbd_wait_ee_list_empty(device, head);
507 spin_unlock_irq(&device->resource->req_lock);
510 static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags)
516 struct msghdr msg = {
517 .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL)
519 iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, size);
520 return sock_recvmsg(sock, &msg, msg.msg_flags);
523 static int drbd_recv(struct drbd_connection *connection, void *buf, size_t size)
527 rv = drbd_recv_short(connection->data.socket, buf, size, 0);
530 if (rv == -ECONNRESET)
531 drbd_info(connection, "sock was reset by peer\n");
532 else if (rv != -ERESTARTSYS)
533 drbd_err(connection, "sock_recvmsg returned %d\n", rv);
534 } else if (rv == 0) {
535 if (test_bit(DISCONNECT_SENT, &connection->flags)) {
538 t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10;
541 t = wait_event_timeout(connection->ping_wait, connection->cstate < C_WF_REPORT_PARAMS, t);
546 drbd_info(connection, "sock was shut down by peer\n");
550 conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD);
556 static int drbd_recv_all(struct drbd_connection *connection, void *buf, size_t size)
560 err = drbd_recv(connection, buf, size);
569 static int drbd_recv_all_warn(struct drbd_connection *connection, void *buf, size_t size)
573 err = drbd_recv_all(connection, buf, size);
574 if (err && !signal_pending(current))
575 drbd_warn(connection, "short read (expected size %d)\n", (int)size);
580 * On individual connections, the socket buffer size must be set prior to the
581 * listen(2) or connect(2) calls in order to have it take effect.
582 * This is our wrapper to do so.
584 static void drbd_setbufsize(struct socket *sock, unsigned int snd,
587 /* open coded SO_SNDBUF, SO_RCVBUF */
589 sock->sk->sk_sndbuf = snd;
590 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
593 sock->sk->sk_rcvbuf = rcv;
594 sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
598 static struct socket *drbd_try_connect(struct drbd_connection *connection)
602 struct sockaddr_in6 src_in6;
603 struct sockaddr_in6 peer_in6;
605 int err, peer_addr_len, my_addr_len;
606 int sndbuf_size, rcvbuf_size, connect_int;
607 int disconnect_on_error = 1;
610 nc = rcu_dereference(connection->net_conf);
615 sndbuf_size = nc->sndbuf_size;
616 rcvbuf_size = nc->rcvbuf_size;
617 connect_int = nc->connect_int;
620 my_addr_len = min_t(int, connection->my_addr_len, sizeof(src_in6));
621 memcpy(&src_in6, &connection->my_addr, my_addr_len);
623 if (((struct sockaddr *)&connection->my_addr)->sa_family == AF_INET6)
624 src_in6.sin6_port = 0;
626 ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */
628 peer_addr_len = min_t(int, connection->peer_addr_len, sizeof(src_in6));
629 memcpy(&peer_in6, &connection->peer_addr, peer_addr_len);
631 what = "sock_create_kern";
632 err = sock_create_kern(&init_net, ((struct sockaddr *)&src_in6)->sa_family,
633 SOCK_STREAM, IPPROTO_TCP, &sock);
639 sock->sk->sk_rcvtimeo =
640 sock->sk->sk_sndtimeo = connect_int * HZ;
641 drbd_setbufsize(sock, sndbuf_size, rcvbuf_size);
643 /* explicitly bind to the configured IP as source IP
644 * for the outgoing connections.
645 * This is needed for multihomed hosts and to be
646 * able to use lo: interfaces for drbd.
647 * Make sure to use 0 as port number, so linux selects
648 * a free one dynamically.
650 what = "bind before connect";
651 err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len);
655 /* connect may fail, peer not yet available.
656 * stay C_WF_CONNECTION, don't go Disconnecting! */
657 disconnect_on_error = 0;
659 err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0);
668 /* timeout, busy, signal pending */
669 case ETIMEDOUT: case EAGAIN: case EINPROGRESS:
670 case EINTR: case ERESTARTSYS:
671 /* peer not (yet) available, network problem */
672 case ECONNREFUSED: case ENETUNREACH:
673 case EHOSTDOWN: case EHOSTUNREACH:
674 disconnect_on_error = 0;
677 drbd_err(connection, "%s failed, err = %d\n", what, err);
679 if (disconnect_on_error)
680 conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD);
686 struct accept_wait_data {
687 struct drbd_connection *connection;
688 struct socket *s_listen;
689 struct completion door_bell;
690 void (*original_sk_state_change)(struct sock *sk);
694 static void drbd_incoming_connection(struct sock *sk)
696 struct accept_wait_data *ad = sk->sk_user_data;
697 void (*state_change)(struct sock *sk);
699 state_change = ad->original_sk_state_change;
700 if (sk->sk_state == TCP_ESTABLISHED)
701 complete(&ad->door_bell);
705 static int prepare_listen_socket(struct drbd_connection *connection, struct accept_wait_data *ad)
707 int err, sndbuf_size, rcvbuf_size, my_addr_len;
708 struct sockaddr_in6 my_addr;
709 struct socket *s_listen;
714 nc = rcu_dereference(connection->net_conf);
719 sndbuf_size = nc->sndbuf_size;
720 rcvbuf_size = nc->rcvbuf_size;
723 my_addr_len = min_t(int, connection->my_addr_len, sizeof(struct sockaddr_in6));
724 memcpy(&my_addr, &connection->my_addr, my_addr_len);
726 what = "sock_create_kern";
727 err = sock_create_kern(&init_net, ((struct sockaddr *)&my_addr)->sa_family,
728 SOCK_STREAM, IPPROTO_TCP, &s_listen);
734 s_listen->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */
735 drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size);
737 what = "bind before listen";
738 err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len);
742 ad->s_listen = s_listen;
743 write_lock_bh(&s_listen->sk->sk_callback_lock);
744 ad->original_sk_state_change = s_listen->sk->sk_state_change;
745 s_listen->sk->sk_state_change = drbd_incoming_connection;
746 s_listen->sk->sk_user_data = ad;
747 write_unlock_bh(&s_listen->sk->sk_callback_lock);
750 err = s_listen->ops->listen(s_listen, 5);
757 sock_release(s_listen);
759 if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) {
760 drbd_err(connection, "%s failed, err = %d\n", what, err);
761 conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD);
768 static void unregister_state_change(struct sock *sk, struct accept_wait_data *ad)
770 write_lock_bh(&sk->sk_callback_lock);
771 sk->sk_state_change = ad->original_sk_state_change;
772 sk->sk_user_data = NULL;
773 write_unlock_bh(&sk->sk_callback_lock);
776 static struct socket *drbd_wait_for_connect(struct drbd_connection *connection, struct accept_wait_data *ad)
778 int timeo, connect_int, err = 0;
779 struct socket *s_estab = NULL;
783 nc = rcu_dereference(connection->net_conf);
788 connect_int = nc->connect_int;
791 timeo = connect_int * HZ;
792 /* 28.5% random jitter */
793 timeo += (prandom_u32() & 1) ? timeo / 7 : -timeo / 7;
795 err = wait_for_completion_interruptible_timeout(&ad->door_bell, timeo);
799 err = kernel_accept(ad->s_listen, &s_estab, 0);
801 if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) {
802 drbd_err(connection, "accept failed, err = %d\n", err);
803 conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD);
808 unregister_state_change(s_estab->sk, ad);
813 static int decode_header(struct drbd_connection *, void *, struct packet_info *);
815 static int send_first_packet(struct drbd_connection *connection, struct drbd_socket *sock,
816 enum drbd_packet cmd)
818 if (!conn_prepare_command(connection, sock))
820 return conn_send_command(connection, sock, cmd, 0, NULL, 0);
823 static int receive_first_packet(struct drbd_connection *connection, struct socket *sock)
825 unsigned int header_size = drbd_header_size(connection);
826 struct packet_info pi;
831 nc = rcu_dereference(connection->net_conf);
836 sock->sk->sk_rcvtimeo = nc->ping_timeo * 4 * HZ / 10;
839 err = drbd_recv_short(sock, connection->data.rbuf, header_size, 0);
840 if (err != header_size) {
845 err = decode_header(connection, connection->data.rbuf, &pi);
852 * drbd_socket_okay() - Free the socket if its connection is not okay
853 * @sock: pointer to the pointer to the socket.
855 static bool drbd_socket_okay(struct socket **sock)
863 rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK);
865 if (rr > 0 || rr == -EAGAIN) {
874 static bool connection_established(struct drbd_connection *connection,
875 struct socket **sock1,
876 struct socket **sock2)
882 if (!*sock1 || !*sock2)
886 nc = rcu_dereference(connection->net_conf);
887 timeout = (nc->sock_check_timeo ?: nc->ping_timeo) * HZ / 10;
889 schedule_timeout_interruptible(timeout);
891 ok = drbd_socket_okay(sock1);
892 ok = drbd_socket_okay(sock2) && ok;
897 /* Gets called if a connection is established, or if a new minor gets created
899 int drbd_connected(struct drbd_peer_device *peer_device)
901 struct drbd_device *device = peer_device->device;
904 atomic_set(&device->packet_seq, 0);
905 device->peer_seq = 0;
907 device->state_mutex = peer_device->connection->agreed_pro_version < 100 ?
908 &peer_device->connection->cstate_mutex :
909 &device->own_state_mutex;
911 err = drbd_send_sync_param(peer_device);
913 err = drbd_send_sizes(peer_device, 0, 0);
915 err = drbd_send_uuids(peer_device);
917 err = drbd_send_current_state(peer_device);
918 clear_bit(USE_DEGR_WFC_T, &device->flags);
919 clear_bit(RESIZE_PENDING, &device->flags);
920 atomic_set(&device->ap_in_flight, 0);
921 mod_timer(&device->request_timer, jiffies + HZ); /* just start it here. */
927 * 1 yes, we have a valid connection
928 * 0 oops, did not work out, please try again
929 * -1 peer talks different language,
930 * no point in trying again, please go standalone.
931 * -2 We do not have a network config...
933 static int conn_connect(struct drbd_connection *connection)
935 struct drbd_socket sock, msock;
936 struct drbd_peer_device *peer_device;
939 bool discard_my_data, ok;
940 enum drbd_state_rv rv;
941 struct accept_wait_data ad = {
942 .connection = connection,
943 .door_bell = COMPLETION_INITIALIZER_ONSTACK(ad.door_bell),
946 clear_bit(DISCONNECT_SENT, &connection->flags);
947 if (conn_request_state(connection, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS)
950 mutex_init(&sock.mutex);
951 sock.sbuf = connection->data.sbuf;
952 sock.rbuf = connection->data.rbuf;
954 mutex_init(&msock.mutex);
955 msock.sbuf = connection->meta.sbuf;
956 msock.rbuf = connection->meta.rbuf;
959 /* Assume that the peer only understands protocol 80 until we know better. */
960 connection->agreed_pro_version = 80;
962 if (prepare_listen_socket(connection, &ad))
968 s = drbd_try_connect(connection);
972 send_first_packet(connection, &sock, P_INITIAL_DATA);
973 } else if (!msock.socket) {
974 clear_bit(RESOLVE_CONFLICTS, &connection->flags);
976 send_first_packet(connection, &msock, P_INITIAL_META);
978 drbd_err(connection, "Logic error in conn_connect()\n");
979 goto out_release_sockets;
983 if (connection_established(connection, &sock.socket, &msock.socket))
987 s = drbd_wait_for_connect(connection, &ad);
989 int fp = receive_first_packet(connection, s);
990 drbd_socket_okay(&sock.socket);
991 drbd_socket_okay(&msock.socket);
995 drbd_warn(connection, "initial packet S crossed\n");
996 sock_release(sock.socket);
1002 case P_INITIAL_META:
1003 set_bit(RESOLVE_CONFLICTS, &connection->flags);
1005 drbd_warn(connection, "initial packet M crossed\n");
1006 sock_release(msock.socket);
1013 drbd_warn(connection, "Error receiving initial packet\n");
1016 if (prandom_u32() & 1)
1021 if (connection->cstate <= C_DISCONNECTING)
1022 goto out_release_sockets;
1023 if (signal_pending(current)) {
1024 flush_signals(current);
1026 if (get_t_state(&connection->receiver) == EXITING)
1027 goto out_release_sockets;
1030 ok = connection_established(connection, &sock.socket, &msock.socket);
1034 sock_release(ad.s_listen);
1036 sock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */
1037 msock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */
1039 sock.socket->sk->sk_allocation = GFP_NOIO;
1040 msock.socket->sk->sk_allocation = GFP_NOIO;
1042 sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK;
1043 msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE;
1046 * sock.socket->sk->sk_sndtimeo = connection->net_conf->timeout*HZ/10;
1047 * sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1048 * first set it to the P_CONNECTION_FEATURES timeout,
1049 * which we set to 4x the configured ping_timeout. */
1051 nc = rcu_dereference(connection->net_conf);
1053 sock.socket->sk->sk_sndtimeo =
1054 sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10;
1056 msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ;
1057 timeout = nc->timeout * HZ / 10;
1058 discard_my_data = nc->discard_my_data;
1061 msock.socket->sk->sk_sndtimeo = timeout;
1063 /* we don't want delays.
1064 * we use TCP_CORK where appropriate, though */
1065 drbd_tcp_nodelay(sock.socket);
1066 drbd_tcp_nodelay(msock.socket);
1068 connection->data.socket = sock.socket;
1069 connection->meta.socket = msock.socket;
1070 connection->last_received = jiffies;
1072 h = drbd_do_features(connection);
1076 if (connection->cram_hmac_tfm) {
1077 /* drbd_request_state(device, NS(conn, WFAuth)); */
1078 switch (drbd_do_auth(connection)) {
1080 drbd_err(connection, "Authentication of peer failed\n");
1083 drbd_err(connection, "Authentication of peer failed, trying again.\n");
1088 connection->data.socket->sk->sk_sndtimeo = timeout;
1089 connection->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1091 if (drbd_send_protocol(connection) == -EOPNOTSUPP)
1094 /* Prevent a race between resync-handshake and
1095 * being promoted to Primary.
1097 * Grab and release the state mutex, so we know that any current
1098 * drbd_set_role() is finished, and any incoming drbd_set_role
1099 * will see the STATE_SENT flag, and wait for it to be cleared.
1101 idr_for_each_entry(&connection->peer_devices, peer_device, vnr)
1102 mutex_lock(peer_device->device->state_mutex);
1104 /* avoid a race with conn_request_state( C_DISCONNECTING ) */
1105 spin_lock_irq(&connection->resource->req_lock);
1106 set_bit(STATE_SENT, &connection->flags);
1107 spin_unlock_irq(&connection->resource->req_lock);
1109 idr_for_each_entry(&connection->peer_devices, peer_device, vnr)
1110 mutex_unlock(peer_device->device->state_mutex);
1113 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
1114 struct drbd_device *device = peer_device->device;
1115 kref_get(&device->kref);
1118 if (discard_my_data)
1119 set_bit(DISCARD_MY_DATA, &device->flags);
1121 clear_bit(DISCARD_MY_DATA, &device->flags);
1123 drbd_connected(peer_device);
1124 kref_put(&device->kref, drbd_destroy_device);
1129 rv = conn_request_state(connection, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE);
1130 if (rv < SS_SUCCESS || connection->cstate != C_WF_REPORT_PARAMS) {
1131 clear_bit(STATE_SENT, &connection->flags);
1135 drbd_thread_start(&connection->ack_receiver);
1136 /* opencoded create_singlethread_workqueue(),
1137 * to be able to use format string arguments */
1138 connection->ack_sender =
1139 alloc_ordered_workqueue("drbd_as_%s", WQ_MEM_RECLAIM, connection->resource->name);
1140 if (!connection->ack_sender) {
1141 drbd_err(connection, "Failed to create workqueue ack_sender\n");
1145 mutex_lock(&connection->resource->conf_update);
1146 /* The discard_my_data flag is a single-shot modifier to the next
1147 * connection attempt, the handshake of which is now well underway.
1148 * No need for rcu style copying of the whole struct
1149 * just to clear a single value. */
1150 connection->net_conf->discard_my_data = 0;
1151 mutex_unlock(&connection->resource->conf_update);
1155 out_release_sockets:
1157 sock_release(ad.s_listen);
1159 sock_release(sock.socket);
1161 sock_release(msock.socket);
1165 static int decode_header(struct drbd_connection *connection, void *header, struct packet_info *pi)
1167 unsigned int header_size = drbd_header_size(connection);
1169 if (header_size == sizeof(struct p_header100) &&
1170 *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) {
1171 struct p_header100 *h = header;
1173 drbd_err(connection, "Header padding is not zero\n");
1176 pi->vnr = be16_to_cpu(h->volume);
1177 pi->cmd = be16_to_cpu(h->command);
1178 pi->size = be32_to_cpu(h->length);
1179 } else if (header_size == sizeof(struct p_header95) &&
1180 *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) {
1181 struct p_header95 *h = header;
1182 pi->cmd = be16_to_cpu(h->command);
1183 pi->size = be32_to_cpu(h->length);
1185 } else if (header_size == sizeof(struct p_header80) &&
1186 *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) {
1187 struct p_header80 *h = header;
1188 pi->cmd = be16_to_cpu(h->command);
1189 pi->size = be16_to_cpu(h->length);
1192 drbd_err(connection, "Wrong magic value 0x%08x in protocol version %d\n",
1193 be32_to_cpu(*(__be32 *)header),
1194 connection->agreed_pro_version);
1197 pi->data = header + header_size;
1201 static void drbd_unplug_all_devices(struct drbd_connection *connection)
1203 if (current->plug == &connection->receiver_plug) {
1204 blk_finish_plug(&connection->receiver_plug);
1205 blk_start_plug(&connection->receiver_plug);
1206 } /* else: maybe just schedule() ?? */
1209 static int drbd_recv_header(struct drbd_connection *connection, struct packet_info *pi)
1211 void *buffer = connection->data.rbuf;
1214 err = drbd_recv_all_warn(connection, buffer, drbd_header_size(connection));
1218 err = decode_header(connection, buffer, pi);
1219 connection->last_received = jiffies;
1224 static int drbd_recv_header_maybe_unplug(struct drbd_connection *connection, struct packet_info *pi)
1226 void *buffer = connection->data.rbuf;
1227 unsigned int size = drbd_header_size(connection);
1230 err = drbd_recv_short(connection->data.socket, buffer, size, MSG_NOSIGNAL|MSG_DONTWAIT);
1232 /* If we have nothing in the receive buffer now, to reduce
1233 * application latency, try to drain the backend queues as
1234 * quickly as possible, and let remote TCP know what we have
1235 * received so far. */
1236 if (err == -EAGAIN) {
1237 drbd_tcp_quickack(connection->data.socket);
1238 drbd_unplug_all_devices(connection);
1244 err = drbd_recv_all_warn(connection, buffer, size);
1249 err = decode_header(connection, connection->data.rbuf, pi);
1250 connection->last_received = jiffies;
1254 /* This is blkdev_issue_flush, but asynchronous.
1255 * We want to submit to all component volumes in parallel,
1256 * then wait for all completions.
1258 struct issue_flush_context {
1261 struct completion done;
1263 struct one_flush_context {
1264 struct drbd_device *device;
1265 struct issue_flush_context *ctx;
1268 static void one_flush_endio(struct bio *bio)
1270 struct one_flush_context *octx = bio->bi_private;
1271 struct drbd_device *device = octx->device;
1272 struct issue_flush_context *ctx = octx->ctx;
1274 if (bio->bi_status) {
1275 ctx->error = blk_status_to_errno(bio->bi_status);
1276 drbd_info(device, "local disk FLUSH FAILED with status %d\n", bio->bi_status);
1281 clear_bit(FLUSH_PENDING, &device->flags);
1283 kref_put(&device->kref, drbd_destroy_device);
1285 if (atomic_dec_and_test(&ctx->pending))
1286 complete(&ctx->done);
1289 static void submit_one_flush(struct drbd_device *device, struct issue_flush_context *ctx)
1291 struct bio *bio = bio_alloc(GFP_NOIO, 0);
1292 struct one_flush_context *octx = kmalloc(sizeof(*octx), GFP_NOIO);
1293 if (!bio || !octx) {
1294 drbd_warn(device, "Could not allocate a bio, CANNOT ISSUE FLUSH\n");
1295 /* FIXME: what else can I do now? disconnecting or detaching
1296 * really does not help to improve the state of the world, either.
1302 ctx->error = -ENOMEM;
1304 kref_put(&device->kref, drbd_destroy_device);
1308 octx->device = device;
1310 bio_set_dev(bio, device->ldev->backing_bdev);
1311 bio->bi_private = octx;
1312 bio->bi_end_io = one_flush_endio;
1313 bio->bi_opf = REQ_OP_FLUSH | REQ_PREFLUSH;
1315 device->flush_jif = jiffies;
1316 set_bit(FLUSH_PENDING, &device->flags);
1317 atomic_inc(&ctx->pending);
1321 static void drbd_flush(struct drbd_connection *connection)
1323 if (connection->resource->write_ordering >= WO_BDEV_FLUSH) {
1324 struct drbd_peer_device *peer_device;
1325 struct issue_flush_context ctx;
1328 atomic_set(&ctx.pending, 1);
1330 init_completion(&ctx.done);
1333 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
1334 struct drbd_device *device = peer_device->device;
1336 if (!get_ldev(device))
1338 kref_get(&device->kref);
1341 submit_one_flush(device, &ctx);
1347 /* Do we want to add a timeout,
1348 * if disk-timeout is set? */
1349 if (!atomic_dec_and_test(&ctx.pending))
1350 wait_for_completion(&ctx.done);
1353 /* would rather check on EOPNOTSUPP, but that is not reliable.
1354 * don't try again for ANY return value != 0
1355 * if (rv == -EOPNOTSUPP) */
1356 /* Any error is already reported by bio_endio callback. */
1357 drbd_bump_write_ordering(connection->resource, NULL, WO_DRAIN_IO);
1363 * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it.
1364 * @device: DRBD device.
1365 * @epoch: Epoch object.
1368 static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *connection,
1369 struct drbd_epoch *epoch,
1370 enum epoch_event ev)
1373 struct drbd_epoch *next_epoch;
1374 enum finish_epoch rv = FE_STILL_LIVE;
1376 spin_lock(&connection->epoch_lock);
1380 epoch_size = atomic_read(&epoch->epoch_size);
1382 switch (ev & ~EV_CLEANUP) {
1384 atomic_dec(&epoch->active);
1386 case EV_GOT_BARRIER_NR:
1387 set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags);
1389 case EV_BECAME_LAST:
1394 if (epoch_size != 0 &&
1395 atomic_read(&epoch->active) == 0 &&
1396 (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) {
1397 if (!(ev & EV_CLEANUP)) {
1398 spin_unlock(&connection->epoch_lock);
1399 drbd_send_b_ack(epoch->connection, epoch->barrier_nr, epoch_size);
1400 spin_lock(&connection->epoch_lock);
1403 /* FIXME: dec unacked on connection, once we have
1404 * something to count pending connection packets in. */
1405 if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags))
1406 dec_unacked(epoch->connection);
1409 if (connection->current_epoch != epoch) {
1410 next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list);
1411 list_del(&epoch->list);
1412 ev = EV_BECAME_LAST | (ev & EV_CLEANUP);
1413 connection->epochs--;
1416 if (rv == FE_STILL_LIVE)
1420 atomic_set(&epoch->epoch_size, 0);
1421 /* atomic_set(&epoch->active, 0); is already zero */
1422 if (rv == FE_STILL_LIVE)
1433 spin_unlock(&connection->epoch_lock);
1438 static enum write_ordering_e
1439 max_allowed_wo(struct drbd_backing_dev *bdev, enum write_ordering_e wo)
1441 struct disk_conf *dc;
1443 dc = rcu_dereference(bdev->disk_conf);
1445 if (wo == WO_BDEV_FLUSH && !dc->disk_flushes)
1447 if (wo == WO_DRAIN_IO && !dc->disk_drain)
1454 * drbd_bump_write_ordering() - Fall back to an other write ordering method
1455 * @connection: DRBD connection.
1456 * @wo: Write ordering method to try.
1458 void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backing_dev *bdev,
1459 enum write_ordering_e wo)
1461 struct drbd_device *device;
1462 enum write_ordering_e pwo;
1464 static char *write_ordering_str[] = {
1466 [WO_DRAIN_IO] = "drain",
1467 [WO_BDEV_FLUSH] = "flush",
1470 pwo = resource->write_ordering;
1471 if (wo != WO_BDEV_FLUSH)
1474 idr_for_each_entry(&resource->devices, device, vnr) {
1475 if (get_ldev(device)) {
1476 wo = max_allowed_wo(device->ldev, wo);
1477 if (device->ldev == bdev)
1484 wo = max_allowed_wo(bdev, wo);
1488 resource->write_ordering = wo;
1489 if (pwo != resource->write_ordering || wo == WO_BDEV_FLUSH)
1490 drbd_info(resource, "Method to ensure write ordering: %s\n", write_ordering_str[resource->write_ordering]);
1493 static void drbd_issue_peer_discard(struct drbd_device *device, struct drbd_peer_request *peer_req)
1495 struct block_device *bdev = device->ldev->backing_bdev;
1497 if (blkdev_issue_zeroout(bdev, peer_req->i.sector, peer_req->i.size >> 9,
1499 peer_req->flags |= EE_WAS_ERROR;
1501 drbd_endio_write_sec_final(peer_req);
1504 static void drbd_issue_peer_wsame(struct drbd_device *device,
1505 struct drbd_peer_request *peer_req)
1507 struct block_device *bdev = device->ldev->backing_bdev;
1508 sector_t s = peer_req->i.sector;
1509 sector_t nr = peer_req->i.size >> 9;
1510 if (blkdev_issue_write_same(bdev, s, nr, GFP_NOIO, peer_req->pages))
1511 peer_req->flags |= EE_WAS_ERROR;
1512 drbd_endio_write_sec_final(peer_req);
1517 * drbd_submit_peer_request()
1518 * @device: DRBD device.
1519 * @peer_req: peer request
1520 * @rw: flag field, see bio->bi_opf
1522 * May spread the pages to multiple bios,
1523 * depending on bio_add_page restrictions.
1525 * Returns 0 if all bios have been submitted,
1526 * -ENOMEM if we could not allocate enough bios,
1527 * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a
1528 * single page to an empty bio (which should never happen and likely indicates
1529 * that the lower level IO stack is in some way broken). This has been observed
1530 * on certain Xen deployments.
1532 /* TODO allocate from our own bio_set. */
1533 int drbd_submit_peer_request(struct drbd_device *device,
1534 struct drbd_peer_request *peer_req,
1535 const unsigned op, const unsigned op_flags,
1536 const int fault_type)
1538 struct bio *bios = NULL;
1540 struct page *page = peer_req->pages;
1541 sector_t sector = peer_req->i.sector;
1542 unsigned data_size = peer_req->i.size;
1543 unsigned n_bios = 0;
1544 unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT;
1547 /* TRIM/DISCARD: for now, always use the helper function
1548 * blkdev_issue_zeroout(..., discard=true).
1549 * It's synchronous, but it does the right thing wrt. bio splitting.
1550 * Correctness first, performance later. Next step is to code an
1551 * asynchronous variant of the same.
1553 if (peer_req->flags & (EE_IS_TRIM|EE_WRITE_SAME)) {
1554 /* wait for all pending IO completions, before we start
1555 * zeroing things out. */
1556 conn_wait_active_ee_empty(peer_req->peer_device->connection);
1557 /* add it to the active list now,
1558 * so we can find it to present it in debugfs */
1559 peer_req->submit_jif = jiffies;
1560 peer_req->flags |= EE_SUBMITTED;
1562 /* If this was a resync request from receive_rs_deallocated(),
1563 * it is already on the sync_ee list */
1564 if (list_empty(&peer_req->w.list)) {
1565 spin_lock_irq(&device->resource->req_lock);
1566 list_add_tail(&peer_req->w.list, &device->active_ee);
1567 spin_unlock_irq(&device->resource->req_lock);
1570 if (peer_req->flags & EE_IS_TRIM)
1571 drbd_issue_peer_discard(device, peer_req);
1572 else /* EE_WRITE_SAME */
1573 drbd_issue_peer_wsame(device, peer_req);
1577 /* In most cases, we will only need one bio. But in case the lower
1578 * level restrictions happen to be different at this offset on this
1579 * side than those of the sending peer, we may need to submit the
1580 * request in more than one bio.
1582 * Plain bio_alloc is good enough here, this is no DRBD internally
1583 * generated bio, but a bio allocated on behalf of the peer.
1586 bio = bio_alloc(GFP_NOIO, nr_pages);
1588 drbd_err(device, "submit_ee: Allocation of a bio failed (nr_pages=%u)\n", nr_pages);
1591 /* > peer_req->i.sector, unless this is the first bio */
1592 bio->bi_iter.bi_sector = sector;
1593 bio_set_dev(bio, device->ldev->backing_bdev);
1594 bio_set_op_attrs(bio, op, op_flags);
1595 bio->bi_private = peer_req;
1596 bio->bi_end_io = drbd_peer_request_endio;
1598 bio->bi_next = bios;
1602 page_chain_for_each(page) {
1603 unsigned len = min_t(unsigned, data_size, PAGE_SIZE);
1604 if (!bio_add_page(bio, page, len, 0))
1610 D_ASSERT(device, data_size == 0);
1611 D_ASSERT(device, page == NULL);
1613 atomic_set(&peer_req->pending_bios, n_bios);
1614 /* for debugfs: update timestamp, mark as submitted */
1615 peer_req->submit_jif = jiffies;
1616 peer_req->flags |= EE_SUBMITTED;
1619 bios = bios->bi_next;
1620 bio->bi_next = NULL;
1622 drbd_generic_make_request(device, fault_type, bio);
1629 bios = bios->bi_next;
1635 static void drbd_remove_epoch_entry_interval(struct drbd_device *device,
1636 struct drbd_peer_request *peer_req)
1638 struct drbd_interval *i = &peer_req->i;
1640 drbd_remove_interval(&device->write_requests, i);
1641 drbd_clear_interval(i);
1643 /* Wake up any processes waiting for this peer request to complete. */
1645 wake_up(&device->misc_wait);
1648 static void conn_wait_active_ee_empty(struct drbd_connection *connection)
1650 struct drbd_peer_device *peer_device;
1654 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
1655 struct drbd_device *device = peer_device->device;
1657 kref_get(&device->kref);
1659 drbd_wait_ee_list_empty(device, &device->active_ee);
1660 kref_put(&device->kref, drbd_destroy_device);
1666 static int receive_Barrier(struct drbd_connection *connection, struct packet_info *pi)
1669 struct p_barrier *p = pi->data;
1670 struct drbd_epoch *epoch;
1672 /* FIXME these are unacked on connection,
1673 * not a specific (peer)device.
1675 connection->current_epoch->barrier_nr = p->barrier;
1676 connection->current_epoch->connection = connection;
1677 rv = drbd_may_finish_epoch(connection, connection->current_epoch, EV_GOT_BARRIER_NR);
1679 /* P_BARRIER_ACK may imply that the corresponding extent is dropped from
1680 * the activity log, which means it would not be resynced in case the
1681 * R_PRIMARY crashes now.
1682 * Therefore we must send the barrier_ack after the barrier request was
1684 switch (connection->resource->write_ordering) {
1686 if (rv == FE_RECYCLED)
1689 /* receiver context, in the writeout path of the other node.
1690 * avoid potential distributed deadlock */
1691 epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
1695 drbd_warn(connection, "Allocation of an epoch failed, slowing down\n");
1700 conn_wait_active_ee_empty(connection);
1701 drbd_flush(connection);
1703 if (atomic_read(&connection->current_epoch->epoch_size)) {
1704 epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
1711 drbd_err(connection, "Strangeness in connection->write_ordering %d\n",
1712 connection->resource->write_ordering);
1717 atomic_set(&epoch->epoch_size, 0);
1718 atomic_set(&epoch->active, 0);
1720 spin_lock(&connection->epoch_lock);
1721 if (atomic_read(&connection->current_epoch->epoch_size)) {
1722 list_add(&epoch->list, &connection->current_epoch->list);
1723 connection->current_epoch = epoch;
1724 connection->epochs++;
1726 /* The current_epoch got recycled while we allocated this one... */
1729 spin_unlock(&connection->epoch_lock);
1734 /* quick wrapper in case payload size != request_size (write same) */
1735 static void drbd_csum_ee_size(struct crypto_shash *h,
1736 struct drbd_peer_request *r, void *d,
1737 unsigned int payload_size)
1739 unsigned int tmp = r->i.size;
1740 r->i.size = payload_size;
1741 drbd_csum_ee(h, r, d);
1745 /* used from receive_RSDataReply (recv_resync_read)
1746 * and from receive_Data.
1747 * data_size: actual payload ("data in")
1748 * for normal writes that is bi_size.
1749 * for discards, that is zero.
1750 * for write same, it is logical_block_size.
1751 * both trim and write same have the bi_size ("data len to be affected")
1752 * as extra argument in the packet header.
1754 static struct drbd_peer_request *
1755 read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector,
1756 struct packet_info *pi) __must_hold(local)
1758 struct drbd_device *device = peer_device->device;
1759 const sector_t capacity = drbd_get_capacity(device->this_bdev);
1760 struct drbd_peer_request *peer_req;
1762 int digest_size, err;
1763 unsigned int data_size = pi->size, ds;
1764 void *dig_in = peer_device->connection->int_dig_in;
1765 void *dig_vv = peer_device->connection->int_dig_vv;
1766 unsigned long *data;
1767 struct p_trim *trim = (pi->cmd == P_TRIM) ? pi->data : NULL;
1768 struct p_trim *wsame = (pi->cmd == P_WSAME) ? pi->data : NULL;
1771 if (!trim && peer_device->connection->peer_integrity_tfm) {
1772 digest_size = crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm);
1774 * FIXME: Receive the incoming digest into the receive buffer
1775 * here, together with its struct p_data?
1777 err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size);
1780 data_size -= digest_size;
1783 /* assume request_size == data_size, but special case trim and wsame. */
1786 if (!expect(data_size == 0))
1788 ds = be32_to_cpu(trim->size);
1790 if (data_size != queue_logical_block_size(device->rq_queue)) {
1791 drbd_err(peer_device, "data size (%u) != drbd logical block size (%u)\n",
1792 data_size, queue_logical_block_size(device->rq_queue));
1795 if (data_size != bdev_logical_block_size(device->ldev->backing_bdev)) {
1796 drbd_err(peer_device, "data size (%u) != backend logical block size (%u)\n",
1797 data_size, bdev_logical_block_size(device->ldev->backing_bdev));
1800 ds = be32_to_cpu(wsame->size);
1803 if (!expect(IS_ALIGNED(ds, 512)))
1805 if (trim || wsame) {
1806 if (!expect(ds <= (DRBD_MAX_BBIO_SECTORS << 9)))
1808 } else if (!expect(ds <= DRBD_MAX_BIO_SIZE))
1811 /* even though we trust out peer,
1812 * we sometimes have to double check. */
1813 if (sector + (ds>>9) > capacity) {
1814 drbd_err(device, "request from peer beyond end of local disk: "
1815 "capacity: %llus < sector: %llus + size: %u\n",
1816 (unsigned long long)capacity,
1817 (unsigned long long)sector, ds);
1821 /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
1822 * "criss-cross" setup, that might cause write-out on some other DRBD,
1823 * which in turn might block on the other node at this very place. */
1824 peer_req = drbd_alloc_peer_req(peer_device, id, sector, ds, data_size, GFP_NOIO);
1828 peer_req->flags |= EE_WRITE;
1830 peer_req->flags |= EE_IS_TRIM;
1834 peer_req->flags |= EE_WRITE_SAME;
1836 /* receive payload size bytes into page chain */
1838 page = peer_req->pages;
1839 page_chain_for_each(page) {
1840 unsigned len = min_t(int, ds, PAGE_SIZE);
1842 err = drbd_recv_all_warn(peer_device->connection, data, len);
1843 if (drbd_insert_fault(device, DRBD_FAULT_RECEIVE)) {
1844 drbd_err(device, "Fault injection: Corrupting data on receive\n");
1845 data[0] = data[0] ^ (unsigned long)-1;
1849 drbd_free_peer_req(device, peer_req);
1856 drbd_csum_ee_size(peer_device->connection->peer_integrity_tfm, peer_req, dig_vv, data_size);
1857 if (memcmp(dig_in, dig_vv, digest_size)) {
1858 drbd_err(device, "Digest integrity check FAILED: %llus +%u\n",
1859 (unsigned long long)sector, data_size);
1860 drbd_free_peer_req(device, peer_req);
1864 device->recv_cnt += data_size >> 9;
1868 /* drbd_drain_block() just takes a data block
1869 * out of the socket input buffer, and discards it.
1871 static int drbd_drain_block(struct drbd_peer_device *peer_device, int data_size)
1880 page = drbd_alloc_pages(peer_device, 1, 1);
1884 unsigned int len = min_t(int, data_size, PAGE_SIZE);
1886 err = drbd_recv_all_warn(peer_device->connection, data, len);
1892 drbd_free_pages(peer_device->device, page, 0);
1896 static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_request *req,
1897 sector_t sector, int data_size)
1899 struct bio_vec bvec;
1900 struct bvec_iter iter;
1902 int digest_size, err, expect;
1903 void *dig_in = peer_device->connection->int_dig_in;
1904 void *dig_vv = peer_device->connection->int_dig_vv;
1907 if (peer_device->connection->peer_integrity_tfm) {
1908 digest_size = crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm);
1909 err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size);
1912 data_size -= digest_size;
1915 /* optimistically update recv_cnt. if receiving fails below,
1916 * we disconnect anyways, and counters will be reset. */
1917 peer_device->device->recv_cnt += data_size>>9;
1919 bio = req->master_bio;
1920 D_ASSERT(peer_device->device, sector == bio->bi_iter.bi_sector);
1922 bio_for_each_segment(bvec, bio, iter) {
1923 void *mapped = kmap(bvec.bv_page) + bvec.bv_offset;
1924 expect = min_t(int, data_size, bvec.bv_len);
1925 err = drbd_recv_all_warn(peer_device->connection, mapped, expect);
1926 kunmap(bvec.bv_page);
1929 data_size -= expect;
1933 drbd_csum_bio(peer_device->connection->peer_integrity_tfm, bio, dig_vv);
1934 if (memcmp(dig_in, dig_vv, digest_size)) {
1935 drbd_err(peer_device, "Digest integrity check FAILED. Broken NICs?\n");
1940 D_ASSERT(peer_device->device, data_size == 0);
1945 * e_end_resync_block() is called in ack_sender context via
1946 * drbd_finish_peer_reqs().
1948 static int e_end_resync_block(struct drbd_work *w, int unused)
1950 struct drbd_peer_request *peer_req =
1951 container_of(w, struct drbd_peer_request, w);
1952 struct drbd_peer_device *peer_device = peer_req->peer_device;
1953 struct drbd_device *device = peer_device->device;
1954 sector_t sector = peer_req->i.sector;
1957 D_ASSERT(device, drbd_interval_empty(&peer_req->i));
1959 if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) {
1960 drbd_set_in_sync(device, sector, peer_req->i.size);
1961 err = drbd_send_ack(peer_device, P_RS_WRITE_ACK, peer_req);
1963 /* Record failure to sync */
1964 drbd_rs_failed_io(device, sector, peer_req->i.size);
1966 err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req);
1968 dec_unacked(device);
1973 static int recv_resync_read(struct drbd_peer_device *peer_device, sector_t sector,
1974 struct packet_info *pi) __releases(local)
1976 struct drbd_device *device = peer_device->device;
1977 struct drbd_peer_request *peer_req;
1979 peer_req = read_in_block(peer_device, ID_SYNCER, sector, pi);
1983 dec_rs_pending(device);
1985 inc_unacked(device);
1986 /* corresponding dec_unacked() in e_end_resync_block()
1987 * respective _drbd_clear_done_ee */
1989 peer_req->w.cb = e_end_resync_block;
1990 peer_req->submit_jif = jiffies;
1992 spin_lock_irq(&device->resource->req_lock);
1993 list_add_tail(&peer_req->w.list, &device->sync_ee);
1994 spin_unlock_irq(&device->resource->req_lock);
1996 atomic_add(pi->size >> 9, &device->rs_sect_ev);
1997 if (drbd_submit_peer_request(device, peer_req, REQ_OP_WRITE, 0,
1998 DRBD_FAULT_RS_WR) == 0)
2001 /* don't care for the reason here */
2002 drbd_err(device, "submit failed, triggering re-connect\n");
2003 spin_lock_irq(&device->resource->req_lock);
2004 list_del(&peer_req->w.list);
2005 spin_unlock_irq(&device->resource->req_lock);
2007 drbd_free_peer_req(device, peer_req);
2013 static struct drbd_request *
2014 find_request(struct drbd_device *device, struct rb_root *root, u64 id,
2015 sector_t sector, bool missing_ok, const char *func)
2017 struct drbd_request *req;
2019 /* Request object according to our peer */
2020 req = (struct drbd_request *)(unsigned long)id;
2021 if (drbd_contains_interval(root, sector, &req->i) && req->i.local)
2024 drbd_err(device, "%s: failed to find request 0x%lx, sector %llus\n", func,
2025 (unsigned long)id, (unsigned long long)sector);
2030 static int receive_DataReply(struct drbd_connection *connection, struct packet_info *pi)
2032 struct drbd_peer_device *peer_device;
2033 struct drbd_device *device;
2034 struct drbd_request *req;
2037 struct p_data *p = pi->data;
2039 peer_device = conn_peer_device(connection, pi->vnr);
2042 device = peer_device->device;
2044 sector = be64_to_cpu(p->sector);
2046 spin_lock_irq(&device->resource->req_lock);
2047 req = find_request(device, &device->read_requests, p->block_id, sector, false, __func__);
2048 spin_unlock_irq(&device->resource->req_lock);
2052 /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid
2053 * special casing it there for the various failure cases.
2054 * still no race with drbd_fail_pending_reads */
2055 err = recv_dless_read(peer_device, req, sector, pi->size);
2057 req_mod(req, DATA_RECEIVED);
2058 /* else: nothing. handled from drbd_disconnect...
2059 * I don't think we may complete this just yet
2060 * in case we are "on-disconnect: freeze" */
2065 static int receive_RSDataReply(struct drbd_connection *connection, struct packet_info *pi)
2067 struct drbd_peer_device *peer_device;
2068 struct drbd_device *device;
2071 struct p_data *p = pi->data;
2073 peer_device = conn_peer_device(connection, pi->vnr);
2076 device = peer_device->device;
2078 sector = be64_to_cpu(p->sector);
2079 D_ASSERT(device, p->block_id == ID_SYNCER);
2081 if (get_ldev(device)) {
2082 /* data is submitted to disk within recv_resync_read.
2083 * corresponding put_ldev done below on error,
2084 * or in drbd_peer_request_endio. */
2085 err = recv_resync_read(peer_device, sector, pi);
2087 if (__ratelimit(&drbd_ratelimit_state))
2088 drbd_err(device, "Can not write resync data to local disk.\n");
2090 err = drbd_drain_block(peer_device, pi->size);
2092 drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size);
2095 atomic_add(pi->size >> 9, &device->rs_sect_in);
2100 static void restart_conflicting_writes(struct drbd_device *device,
2101 sector_t sector, int size)
2103 struct drbd_interval *i;
2104 struct drbd_request *req;
2106 drbd_for_each_overlap(i, &device->write_requests, sector, size) {
2109 req = container_of(i, struct drbd_request, i);
2110 if (req->rq_state & RQ_LOCAL_PENDING ||
2111 !(req->rq_state & RQ_POSTPONED))
2113 /* as it is RQ_POSTPONED, this will cause it to
2114 * be queued on the retry workqueue. */
2115 __req_mod(req, CONFLICT_RESOLVED, NULL);
2120 * e_end_block() is called in ack_sender context via drbd_finish_peer_reqs().
2122 static int e_end_block(struct drbd_work *w, int cancel)
2124 struct drbd_peer_request *peer_req =
2125 container_of(w, struct drbd_peer_request, w);
2126 struct drbd_peer_device *peer_device = peer_req->peer_device;
2127 struct drbd_device *device = peer_device->device;
2128 sector_t sector = peer_req->i.sector;
2131 if (peer_req->flags & EE_SEND_WRITE_ACK) {
2132 if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) {
2133 pcmd = (device->state.conn >= C_SYNC_SOURCE &&
2134 device->state.conn <= C_PAUSED_SYNC_T &&
2135 peer_req->flags & EE_MAY_SET_IN_SYNC) ?
2136 P_RS_WRITE_ACK : P_WRITE_ACK;
2137 err = drbd_send_ack(peer_device, pcmd, peer_req);
2138 if (pcmd == P_RS_WRITE_ACK)
2139 drbd_set_in_sync(device, sector, peer_req->i.size);
2141 err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req);
2142 /* we expect it to be marked out of sync anyways...
2143 * maybe assert this? */
2145 dec_unacked(device);
2148 /* we delete from the conflict detection hash _after_ we sent out the
2149 * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */
2150 if (peer_req->flags & EE_IN_INTERVAL_TREE) {
2151 spin_lock_irq(&device->resource->req_lock);
2152 D_ASSERT(device, !drbd_interval_empty(&peer_req->i));
2153 drbd_remove_epoch_entry_interval(device, peer_req);
2154 if (peer_req->flags & EE_RESTART_REQUESTS)
2155 restart_conflicting_writes(device, sector, peer_req->i.size);
2156 spin_unlock_irq(&device->resource->req_lock);
2158 D_ASSERT(device, drbd_interval_empty(&peer_req->i));
2160 drbd_may_finish_epoch(peer_device->connection, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0));
2165 static int e_send_ack(struct drbd_work *w, enum drbd_packet ack)
2167 struct drbd_peer_request *peer_req =
2168 container_of(w, struct drbd_peer_request, w);
2169 struct drbd_peer_device *peer_device = peer_req->peer_device;
2172 err = drbd_send_ack(peer_device, ack, peer_req);
2173 dec_unacked(peer_device->device);
2178 static int e_send_superseded(struct drbd_work *w, int unused)
2180 return e_send_ack(w, P_SUPERSEDED);
2183 static int e_send_retry_write(struct drbd_work *w, int unused)
2185 struct drbd_peer_request *peer_req =
2186 container_of(w, struct drbd_peer_request, w);
2187 struct drbd_connection *connection = peer_req->peer_device->connection;
2189 return e_send_ack(w, connection->agreed_pro_version >= 100 ?
2190 P_RETRY_WRITE : P_SUPERSEDED);
2193 static bool seq_greater(u32 a, u32 b)
2196 * We assume 32-bit wrap-around here.
2197 * For 24-bit wrap-around, we would have to shift:
2200 return (s32)a - (s32)b > 0;
2203 static u32 seq_max(u32 a, u32 b)
2205 return seq_greater(a, b) ? a : b;
2208 static void update_peer_seq(struct drbd_peer_device *peer_device, unsigned int peer_seq)
2210 struct drbd_device *device = peer_device->device;
2211 unsigned int newest_peer_seq;
2213 if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) {
2214 spin_lock(&device->peer_seq_lock);
2215 newest_peer_seq = seq_max(device->peer_seq, peer_seq);
2216 device->peer_seq = newest_peer_seq;
2217 spin_unlock(&device->peer_seq_lock);
2218 /* wake up only if we actually changed device->peer_seq */
2219 if (peer_seq == newest_peer_seq)
2220 wake_up(&device->seq_wait);
2224 static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2)
2226 return !((s1 + (l1>>9) <= s2) || (s1 >= s2 + (l2>>9)));
2229 /* maybe change sync_ee into interval trees as well? */
2230 static bool overlapping_resync_write(struct drbd_device *device, struct drbd_peer_request *peer_req)
2232 struct drbd_peer_request *rs_req;
2235 spin_lock_irq(&device->resource->req_lock);
2236 list_for_each_entry(rs_req, &device->sync_ee, w.list) {
2237 if (overlaps(peer_req->i.sector, peer_req->i.size,
2238 rs_req->i.sector, rs_req->i.size)) {
2243 spin_unlock_irq(&device->resource->req_lock);
2248 /* Called from receive_Data.
2249 * Synchronize packets on sock with packets on msock.
2251 * This is here so even when a P_DATA packet traveling via sock overtook an Ack
2252 * packet traveling on msock, they are still processed in the order they have
2255 * Note: we don't care for Ack packets overtaking P_DATA packets.
2257 * In case packet_seq is larger than device->peer_seq number, there are
2258 * outstanding packets on the msock. We wait for them to arrive.
2259 * In case we are the logically next packet, we update device->peer_seq
2260 * ourselves. Correctly handles 32bit wrap around.
2262 * Assume we have a 10 GBit connection, that is about 1<<30 byte per second,
2263 * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds
2264 * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have
2265 * 1<<9 == 512 seconds aka ages for the 32bit wrap around...
2267 * returns 0 if we may process the packet,
2268 * -ERESTARTSYS if we were interrupted (by disconnect signal). */
2269 static int wait_for_and_update_peer_seq(struct drbd_peer_device *peer_device, const u32 peer_seq)
2271 struct drbd_device *device = peer_device->device;
2276 if (!test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags))
2279 spin_lock(&device->peer_seq_lock);
2281 if (!seq_greater(peer_seq - 1, device->peer_seq)) {
2282 device->peer_seq = seq_max(device->peer_seq, peer_seq);
2286 if (signal_pending(current)) {
2292 tp = rcu_dereference(peer_device->connection->net_conf)->two_primaries;
2298 /* Only need to wait if two_primaries is enabled */
2299 prepare_to_wait(&device->seq_wait, &wait, TASK_INTERRUPTIBLE);
2300 spin_unlock(&device->peer_seq_lock);
2302 timeout = rcu_dereference(peer_device->connection->net_conf)->ping_timeo*HZ/10;
2304 timeout = schedule_timeout(timeout);
2305 spin_lock(&device->peer_seq_lock);
2308 drbd_err(device, "Timed out waiting for missing ack packets; disconnecting\n");
2312 spin_unlock(&device->peer_seq_lock);
2313 finish_wait(&device->seq_wait, &wait);
2317 /* see also bio_flags_to_wire()
2318 * DRBD_REQ_*, because we need to semantically map the flags to data packet
2319 * flags and back. We may replicate to other kernel versions. */
2320 static unsigned long wire_flags_to_bio_flags(u32 dpf)
2322 return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) |
2323 (dpf & DP_FUA ? REQ_FUA : 0) |
2324 (dpf & DP_FLUSH ? REQ_PREFLUSH : 0);
2327 static unsigned long wire_flags_to_bio_op(u32 dpf)
2329 if (dpf & DP_DISCARD)
2330 return REQ_OP_WRITE_ZEROES;
2332 return REQ_OP_WRITE;
2335 static void fail_postponed_requests(struct drbd_device *device, sector_t sector,
2338 struct drbd_interval *i;
2341 drbd_for_each_overlap(i, &device->write_requests, sector, size) {
2342 struct drbd_request *req;
2343 struct bio_and_error m;
2347 req = container_of(i, struct drbd_request, i);
2348 if (!(req->rq_state & RQ_POSTPONED))
2350 req->rq_state &= ~RQ_POSTPONED;
2351 __req_mod(req, NEG_ACKED, &m);
2352 spin_unlock_irq(&device->resource->req_lock);
2354 complete_master_bio(device, &m);
2355 spin_lock_irq(&device->resource->req_lock);
2360 static int handle_write_conflicts(struct drbd_device *device,
2361 struct drbd_peer_request *peer_req)
2363 struct drbd_connection *connection = peer_req->peer_device->connection;
2364 bool resolve_conflicts = test_bit(RESOLVE_CONFLICTS, &connection->flags);
2365 sector_t sector = peer_req->i.sector;
2366 const unsigned int size = peer_req->i.size;
2367 struct drbd_interval *i;
2372 * Inserting the peer request into the write_requests tree will prevent
2373 * new conflicting local requests from being added.
2375 drbd_insert_interval(&device->write_requests, &peer_req->i);
2378 drbd_for_each_overlap(i, &device->write_requests, sector, size) {
2379 if (i == &peer_req->i)
2386 * Our peer has sent a conflicting remote request; this
2387 * should not happen in a two-node setup. Wait for the
2388 * earlier peer request to complete.
2390 err = drbd_wait_misc(device, i);
2396 equal = i->sector == sector && i->size == size;
2397 if (resolve_conflicts) {
2399 * If the peer request is fully contained within the
2400 * overlapping request, it can be considered overwritten
2401 * and thus superseded; otherwise, it will be retried
2402 * once all overlapping requests have completed.
2404 bool superseded = i->sector <= sector && i->sector +
2405 (i->size >> 9) >= sector + (size >> 9);
2408 drbd_alert(device, "Concurrent writes detected: "
2409 "local=%llus +%u, remote=%llus +%u, "
2410 "assuming %s came first\n",
2411 (unsigned long long)i->sector, i->size,
2412 (unsigned long long)sector, size,
2413 superseded ? "local" : "remote");
2415 peer_req->w.cb = superseded ? e_send_superseded :
2417 list_add_tail(&peer_req->w.list, &device->done_ee);
2418 queue_work(connection->ack_sender, &peer_req->peer_device->send_acks_work);
2423 struct drbd_request *req =
2424 container_of(i, struct drbd_request, i);
2427 drbd_alert(device, "Concurrent writes detected: "
2428 "local=%llus +%u, remote=%llus +%u\n",
2429 (unsigned long long)i->sector, i->size,
2430 (unsigned long long)sector, size);
2432 if (req->rq_state & RQ_LOCAL_PENDING ||
2433 !(req->rq_state & RQ_POSTPONED)) {
2435 * Wait for the node with the discard flag to
2436 * decide if this request has been superseded
2437 * or needs to be retried.
2438 * Requests that have been superseded will
2439 * disappear from the write_requests tree.
2441 * In addition, wait for the conflicting
2442 * request to finish locally before submitting
2443 * the conflicting peer request.
2445 err = drbd_wait_misc(device, &req->i);
2447 _conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD);
2448 fail_postponed_requests(device, sector, size);
2454 * Remember to restart the conflicting requests after
2455 * the new peer request has completed.
2457 peer_req->flags |= EE_RESTART_REQUESTS;
2464 drbd_remove_epoch_entry_interval(device, peer_req);
2468 /* mirrored write */
2469 static int receive_Data(struct drbd_connection *connection, struct packet_info *pi)
2471 struct drbd_peer_device *peer_device;
2472 struct drbd_device *device;
2473 struct net_conf *nc;
2475 struct drbd_peer_request *peer_req;
2476 struct p_data *p = pi->data;
2477 u32 peer_seq = be32_to_cpu(p->seq_num);
2482 peer_device = conn_peer_device(connection, pi->vnr);
2485 device = peer_device->device;
2487 if (!get_ldev(device)) {
2490 err = wait_for_and_update_peer_seq(peer_device, peer_seq);
2491 drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size);
2492 atomic_inc(&connection->current_epoch->epoch_size);
2493 err2 = drbd_drain_block(peer_device, pi->size);
2500 * Corresponding put_ldev done either below (on various errors), or in
2501 * drbd_peer_request_endio, if we successfully submit the data at the
2502 * end of this function.
2505 sector = be64_to_cpu(p->sector);
2506 peer_req = read_in_block(peer_device, p->block_id, sector, pi);
2512 peer_req->w.cb = e_end_block;
2513 peer_req->submit_jif = jiffies;
2514 peer_req->flags |= EE_APPLICATION;
2516 dp_flags = be32_to_cpu(p->dp_flags);
2517 op = wire_flags_to_bio_op(dp_flags);
2518 op_flags = wire_flags_to_bio_flags(dp_flags);
2519 if (pi->cmd == P_TRIM) {
2520 D_ASSERT(peer_device, peer_req->i.size > 0);
2521 D_ASSERT(peer_device, op == REQ_OP_WRITE_ZEROES);
2522 D_ASSERT(peer_device, peer_req->pages == NULL);
2523 } else if (peer_req->pages == NULL) {
2524 D_ASSERT(device, peer_req->i.size == 0);
2525 D_ASSERT(device, dp_flags & DP_FLUSH);
2528 if (dp_flags & DP_MAY_SET_IN_SYNC)
2529 peer_req->flags |= EE_MAY_SET_IN_SYNC;
2531 spin_lock(&connection->epoch_lock);
2532 peer_req->epoch = connection->current_epoch;
2533 atomic_inc(&peer_req->epoch->epoch_size);
2534 atomic_inc(&peer_req->epoch->active);
2535 spin_unlock(&connection->epoch_lock);
2538 nc = rcu_dereference(peer_device->connection->net_conf);
2539 tp = nc->two_primaries;
2540 if (peer_device->connection->agreed_pro_version < 100) {
2541 switch (nc->wire_protocol) {
2543 dp_flags |= DP_SEND_WRITE_ACK;
2546 dp_flags |= DP_SEND_RECEIVE_ACK;
2552 if (dp_flags & DP_SEND_WRITE_ACK) {
2553 peer_req->flags |= EE_SEND_WRITE_ACK;
2554 inc_unacked(device);
2555 /* corresponding dec_unacked() in e_end_block()
2556 * respective _drbd_clear_done_ee */
2559 if (dp_flags & DP_SEND_RECEIVE_ACK) {
2560 /* I really don't like it that the receiver thread
2561 * sends on the msock, but anyways */
2562 drbd_send_ack(peer_device, P_RECV_ACK, peer_req);
2566 /* two primaries implies protocol C */
2567 D_ASSERT(device, dp_flags & DP_SEND_WRITE_ACK);
2568 peer_req->flags |= EE_IN_INTERVAL_TREE;
2569 err = wait_for_and_update_peer_seq(peer_device, peer_seq);
2571 goto out_interrupted;
2572 spin_lock_irq(&device->resource->req_lock);
2573 err = handle_write_conflicts(device, peer_req);
2575 spin_unlock_irq(&device->resource->req_lock);
2576 if (err == -ENOENT) {
2580 goto out_interrupted;
2583 update_peer_seq(peer_device, peer_seq);
2584 spin_lock_irq(&device->resource->req_lock);
2586 /* TRIM and WRITE_SAME are processed synchronously,
2587 * we wait for all pending requests, respectively wait for
2588 * active_ee to become empty in drbd_submit_peer_request();
2589 * better not add ourselves here. */
2590 if ((peer_req->flags & (EE_IS_TRIM|EE_WRITE_SAME)) == 0)
2591 list_add_tail(&peer_req->w.list, &device->active_ee);
2592 spin_unlock_irq(&device->resource->req_lock);
2594 if (device->state.conn == C_SYNC_TARGET)
2595 wait_event(device->ee_wait, !overlapping_resync_write(device, peer_req));
2597 if (device->state.pdsk < D_INCONSISTENT) {
2598 /* In case we have the only disk of the cluster, */
2599 drbd_set_out_of_sync(device, peer_req->i.sector, peer_req->i.size);
2600 peer_req->flags &= ~EE_MAY_SET_IN_SYNC;
2601 drbd_al_begin_io(device, &peer_req->i);
2602 peer_req->flags |= EE_CALL_AL_COMPLETE_IO;
2605 err = drbd_submit_peer_request(device, peer_req, op, op_flags,
2610 /* don't care for the reason here */
2611 drbd_err(device, "submit failed, triggering re-connect\n");
2612 spin_lock_irq(&device->resource->req_lock);
2613 list_del(&peer_req->w.list);
2614 drbd_remove_epoch_entry_interval(device, peer_req);
2615 spin_unlock_irq(&device->resource->req_lock);
2616 if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) {
2617 peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO;
2618 drbd_al_complete_io(device, &peer_req->i);
2622 drbd_may_finish_epoch(connection, peer_req->epoch, EV_PUT | EV_CLEANUP);
2624 drbd_free_peer_req(device, peer_req);
2628 /* We may throttle resync, if the lower device seems to be busy,
2629 * and current sync rate is above c_min_rate.
2631 * To decide whether or not the lower device is busy, we use a scheme similar
2632 * to MD RAID is_mddev_idle(): if the partition stats reveal "significant"
2633 * (more than 64 sectors) of activity we cannot account for with our own resync
2634 * activity, it obviously is "busy".
2636 * The current sync rate used here uses only the most recent two step marks,
2637 * to have a short time average so we can react faster.
2639 bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector,
2640 bool throttle_if_app_is_waiting)
2642 struct lc_element *tmp;
2643 bool throttle = drbd_rs_c_min_rate_throttle(device);
2645 if (!throttle || throttle_if_app_is_waiting)
2648 spin_lock_irq(&device->al_lock);
2649 tmp = lc_find(device->resync, BM_SECT_TO_EXT(sector));
2651 struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce);
2652 if (test_bit(BME_PRIORITY, &bm_ext->flags))
2654 /* Do not slow down if app IO is already waiting for this extent,
2655 * and our progress is necessary for application IO to complete. */
2657 spin_unlock_irq(&device->al_lock);
2662 bool drbd_rs_c_min_rate_throttle(struct drbd_device *device)
2664 struct gendisk *disk = device->ldev->backing_bdev->bd_contains->bd_disk;
2665 unsigned long db, dt, dbdt;
2666 unsigned int c_min_rate;
2670 c_min_rate = rcu_dereference(device->ldev->disk_conf)->c_min_rate;
2673 /* feature disabled? */
2674 if (c_min_rate == 0)
2677 curr_events = (int)part_stat_read_accum(&disk->part0, sectors) -
2678 atomic_read(&device->rs_sect_ev);
2680 if (atomic_read(&device->ap_actlog_cnt)
2681 || curr_events - device->rs_last_events > 64) {
2682 unsigned long rs_left;
2685 device->rs_last_events = curr_events;
2687 /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP,
2689 i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;
2691 if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T)
2692 rs_left = device->ov_left;
2694 rs_left = drbd_bm_total_weight(device) - device->rs_failed;
2696 dt = ((long)jiffies - (long)device->rs_mark_time[i]) / HZ;
2699 db = device->rs_mark_left[i] - rs_left;
2700 dbdt = Bit2KB(db/dt);
2702 if (dbdt > c_min_rate)
2708 static int receive_DataRequest(struct drbd_connection *connection, struct packet_info *pi)
2710 struct drbd_peer_device *peer_device;
2711 struct drbd_device *device;
2714 struct drbd_peer_request *peer_req;
2715 struct digest_info *di = NULL;
2717 unsigned int fault_type;
2718 struct p_block_req *p = pi->data;
2720 peer_device = conn_peer_device(connection, pi->vnr);
2723 device = peer_device->device;
2724 capacity = drbd_get_capacity(device->this_bdev);
2726 sector = be64_to_cpu(p->sector);
2727 size = be32_to_cpu(p->blksize);
2729 if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) {
2730 drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
2731 (unsigned long long)sector, size);
2734 if (sector + (size>>9) > capacity) {
2735 drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
2736 (unsigned long long)sector, size);
2740 if (!get_ldev_if_state(device, D_UP_TO_DATE)) {
2743 case P_DATA_REQUEST:
2744 drbd_send_ack_rp(peer_device, P_NEG_DREPLY, p);
2747 case P_RS_DATA_REQUEST:
2748 case P_CSUM_RS_REQUEST:
2750 drbd_send_ack_rp(peer_device, P_NEG_RS_DREPLY , p);
2754 dec_rs_pending(device);
2755 drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, size, ID_IN_SYNC);
2760 if (verb && __ratelimit(&drbd_ratelimit_state))
2761 drbd_err(device, "Can not satisfy peer's read request, "
2762 "no local data.\n");
2764 /* drain possibly payload */
2765 return drbd_drain_block(peer_device, pi->size);
2768 /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
2769 * "criss-cross" setup, that might cause write-out on some other DRBD,
2770 * which in turn might block on the other node at this very place. */
2771 peer_req = drbd_alloc_peer_req(peer_device, p->block_id, sector, size,
2779 case P_DATA_REQUEST:
2780 peer_req->w.cb = w_e_end_data_req;
2781 fault_type = DRBD_FAULT_DT_RD;
2782 /* application IO, don't drbd_rs_begin_io */
2783 peer_req->flags |= EE_APPLICATION;
2787 /* If at some point in the future we have a smart way to
2788 find out if this data block is completely deallocated,
2789 then we would do something smarter here than reading
2791 peer_req->flags |= EE_RS_THIN_REQ;
2793 case P_RS_DATA_REQUEST:
2794 peer_req->w.cb = w_e_end_rsdata_req;
2795 fault_type = DRBD_FAULT_RS_RD;
2796 /* used in the sector offset progress display */
2797 device->bm_resync_fo = BM_SECT_TO_BIT(sector);
2801 case P_CSUM_RS_REQUEST:
2802 fault_type = DRBD_FAULT_RS_RD;
2803 di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO);
2807 di->digest_size = pi->size;
2808 di->digest = (((char *)di)+sizeof(struct digest_info));
2810 peer_req->digest = di;
2811 peer_req->flags |= EE_HAS_DIGEST;
2813 if (drbd_recv_all(peer_device->connection, di->digest, pi->size))
2816 if (pi->cmd == P_CSUM_RS_REQUEST) {
2817 D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89);
2818 peer_req->w.cb = w_e_end_csum_rs_req;
2819 /* used in the sector offset progress display */
2820 device->bm_resync_fo = BM_SECT_TO_BIT(sector);
2821 /* remember to report stats in drbd_resync_finished */
2822 device->use_csums = true;
2823 } else if (pi->cmd == P_OV_REPLY) {
2824 /* track progress, we may need to throttle */
2825 atomic_add(size >> 9, &device->rs_sect_in);
2826 peer_req->w.cb = w_e_end_ov_reply;
2827 dec_rs_pending(device);
2828 /* drbd_rs_begin_io done when we sent this request,
2829 * but accounting still needs to be done. */
2830 goto submit_for_resync;
2835 if (device->ov_start_sector == ~(sector_t)0 &&
2836 peer_device->connection->agreed_pro_version >= 90) {
2837 unsigned long now = jiffies;
2839 device->ov_start_sector = sector;
2840 device->ov_position = sector;
2841 device->ov_left = drbd_bm_bits(device) - BM_SECT_TO_BIT(sector);
2842 device->rs_total = device->ov_left;
2843 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
2844 device->rs_mark_left[i] = device->ov_left;
2845 device->rs_mark_time[i] = now;
2847 drbd_info(device, "Online Verify start sector: %llu\n",
2848 (unsigned long long)sector);
2850 peer_req->w.cb = w_e_end_ov_req;
2851 fault_type = DRBD_FAULT_RS_RD;
2858 /* Throttle, drbd_rs_begin_io and submit should become asynchronous
2859 * wrt the receiver, but it is not as straightforward as it may seem.
2860 * Various places in the resync start and stop logic assume resync
2861 * requests are processed in order, requeuing this on the worker thread
2862 * introduces a bunch of new code for synchronization between threads.
2864 * Unlimited throttling before drbd_rs_begin_io may stall the resync
2865 * "forever", throttling after drbd_rs_begin_io will lock that extent
2866 * for application writes for the same time. For now, just throttle
2867 * here, where the rest of the code expects the receiver to sleep for
2871 /* Throttle before drbd_rs_begin_io, as that locks out application IO;
2872 * this defers syncer requests for some time, before letting at least
2873 * on request through. The resync controller on the receiving side
2874 * will adapt to the incoming rate accordingly.
2876 * We cannot throttle here if remote is Primary/SyncTarget:
2877 * we would also throttle its application reads.
2878 * In that case, throttling is done on the SyncTarget only.
2881 /* Even though this may be a resync request, we do add to "read_ee";
2882 * "sync_ee" is only used for resync WRITEs.
2883 * Add to list early, so debugfs can find this request
2884 * even if we have to sleep below. */
2885 spin_lock_irq(&device->resource->req_lock);
2886 list_add_tail(&peer_req->w.list, &device->read_ee);
2887 spin_unlock_irq(&device->resource->req_lock);
2889 update_receiver_timing_details(connection, drbd_rs_should_slow_down);
2890 if (device->state.peer != R_PRIMARY
2891 && drbd_rs_should_slow_down(device, sector, false))
2892 schedule_timeout_uninterruptible(HZ/10);
2893 update_receiver_timing_details(connection, drbd_rs_begin_io);
2894 if (drbd_rs_begin_io(device, sector))
2898 atomic_add(size >> 9, &device->rs_sect_ev);
2901 update_receiver_timing_details(connection, drbd_submit_peer_request);
2902 inc_unacked(device);
2903 if (drbd_submit_peer_request(device, peer_req, REQ_OP_READ, 0,
2907 /* don't care for the reason here */
2908 drbd_err(device, "submit failed, triggering re-connect\n");
2911 spin_lock_irq(&device->resource->req_lock);
2912 list_del(&peer_req->w.list);
2913 spin_unlock_irq(&device->resource->req_lock);
2914 /* no drbd_rs_complete_io(), we are dropping the connection anyways */
2917 drbd_free_peer_req(device, peer_req);
2922 * drbd_asb_recover_0p - Recover after split-brain with no remaining primaries
2924 static int drbd_asb_recover_0p(struct drbd_peer_device *peer_device) __must_hold(local)
2926 struct drbd_device *device = peer_device->device;
2927 int self, peer, rv = -100;
2928 unsigned long ch_self, ch_peer;
2929 enum drbd_after_sb_p after_sb_0p;
2931 self = device->ldev->md.uuid[UI_BITMAP] & 1;
2932 peer = device->p_uuid[UI_BITMAP] & 1;
2934 ch_peer = device->p_uuid[UI_SIZE];
2935 ch_self = device->comm_bm_set;
2938 after_sb_0p = rcu_dereference(peer_device->connection->net_conf)->after_sb_0p;
2940 switch (after_sb_0p) {
2942 case ASB_DISCARD_SECONDARY:
2943 case ASB_CALL_HELPER:
2945 drbd_err(device, "Configuration error.\n");
2947 case ASB_DISCONNECT:
2949 case ASB_DISCARD_YOUNGER_PRI:
2950 if (self == 0 && peer == 1) {
2954 if (self == 1 && peer == 0) {
2958 /* Else fall through to one of the other strategies... */
2959 case ASB_DISCARD_OLDER_PRI:
2960 if (self == 0 && peer == 1) {
2964 if (self == 1 && peer == 0) {
2968 /* Else fall through to one of the other strategies... */
2969 drbd_warn(device, "Discard younger/older primary did not find a decision\n"
2970 "Using discard-least-changes instead\n");
2972 case ASB_DISCARD_ZERO_CHG:
2973 if (ch_peer == 0 && ch_self == 0) {
2974 rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)
2978 if (ch_peer == 0) { rv = 1; break; }
2979 if (ch_self == 0) { rv = -1; break; }
2981 if (after_sb_0p == ASB_DISCARD_ZERO_CHG)
2983 /* else: fall through */
2984 case ASB_DISCARD_LEAST_CHG:
2985 if (ch_self < ch_peer)
2987 else if (ch_self > ch_peer)
2989 else /* ( ch_self == ch_peer ) */
2990 /* Well, then use something else. */
2991 rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)
2994 case ASB_DISCARD_LOCAL:
2997 case ASB_DISCARD_REMOTE:
3005 * drbd_asb_recover_1p - Recover after split-brain with one remaining primary
3007 static int drbd_asb_recover_1p(struct drbd_peer_device *peer_device) __must_hold(local)
3009 struct drbd_device *device = peer_device->device;
3011 enum drbd_after_sb_p after_sb_1p;
3014 after_sb_1p = rcu_dereference(peer_device->connection->net_conf)->after_sb_1p;
3016 switch (after_sb_1p) {
3017 case ASB_DISCARD_YOUNGER_PRI:
3018 case ASB_DISCARD_OLDER_PRI:
3019 case ASB_DISCARD_LEAST_CHG:
3020 case ASB_DISCARD_LOCAL:
3021 case ASB_DISCARD_REMOTE:
3022 case ASB_DISCARD_ZERO_CHG:
3023 drbd_err(device, "Configuration error.\n");
3025 case ASB_DISCONNECT:
3028 hg = drbd_asb_recover_0p(peer_device);
3029 if (hg == -1 && device->state.role == R_SECONDARY)
3031 if (hg == 1 && device->state.role == R_PRIMARY)
3035 rv = drbd_asb_recover_0p(peer_device);
3037 case ASB_DISCARD_SECONDARY:
3038 return device->state.role == R_PRIMARY ? 1 : -1;
3039 case ASB_CALL_HELPER:
3040 hg = drbd_asb_recover_0p(peer_device);
3041 if (hg == -1 && device->state.role == R_PRIMARY) {
3042 enum drbd_state_rv rv2;
3044 /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
3045 * we might be here in C_WF_REPORT_PARAMS which is transient.
3046 * we do not need to wait for the after state change work either. */
3047 rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY));
3048 if (rv2 != SS_SUCCESS) {
3049 drbd_khelper(device, "pri-lost-after-sb");
3051 drbd_warn(device, "Successfully gave up primary role.\n");
3062 * drbd_asb_recover_2p - Recover after split-brain with two remaining primaries
3064 static int drbd_asb_recover_2p(struct drbd_peer_device *peer_device) __must_hold(local)
3066 struct drbd_device *device = peer_device->device;
3068 enum drbd_after_sb_p after_sb_2p;
3071 after_sb_2p = rcu_dereference(peer_device->connection->net_conf)->after_sb_2p;
3073 switch (after_sb_2p) {
3074 case ASB_DISCARD_YOUNGER_PRI:
3075 case ASB_DISCARD_OLDER_PRI:
3076 case ASB_DISCARD_LEAST_CHG:
3077 case ASB_DISCARD_LOCAL:
3078 case ASB_DISCARD_REMOTE:
3080 case ASB_DISCARD_SECONDARY:
3081 case ASB_DISCARD_ZERO_CHG:
3082 drbd_err(device, "Configuration error.\n");
3085 rv = drbd_asb_recover_0p(peer_device);
3087 case ASB_DISCONNECT:
3089 case ASB_CALL_HELPER:
3090 hg = drbd_asb_recover_0p(peer_device);
3092 enum drbd_state_rv rv2;
3094 /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
3095 * we might be here in C_WF_REPORT_PARAMS which is transient.
3096 * we do not need to wait for the after state change work either. */
3097 rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY));
3098 if (rv2 != SS_SUCCESS) {
3099 drbd_khelper(device, "pri-lost-after-sb");
3101 drbd_warn(device, "Successfully gave up primary role.\n");
3111 static void drbd_uuid_dump(struct drbd_device *device, char *text, u64 *uuid,
3112 u64 bits, u64 flags)
3115 drbd_info(device, "%s uuid info vanished while I was looking!\n", text);
3118 drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n",
3120 (unsigned long long)uuid[UI_CURRENT],
3121 (unsigned long long)uuid[UI_BITMAP],
3122 (unsigned long long)uuid[UI_HISTORY_START],
3123 (unsigned long long)uuid[UI_HISTORY_END],
3124 (unsigned long long)bits,
3125 (unsigned long long)flags);
3129 100 after split brain try auto recover
3130 2 C_SYNC_SOURCE set BitMap
3131 1 C_SYNC_SOURCE use BitMap
3133 -1 C_SYNC_TARGET use BitMap
3134 -2 C_SYNC_TARGET set BitMap
3135 -100 after split brain, disconnect
3136 -1000 unrelated data
3137 -1091 requires proto 91
3138 -1096 requires proto 96
3141 static int drbd_uuid_compare(struct drbd_device *const device, enum drbd_role const peer_role, int *rule_nr) __must_hold(local)
3143 struct drbd_peer_device *const peer_device = first_peer_device(device);
3144 struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL;
3148 self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
3149 peer = device->p_uuid[UI_CURRENT] & ~((u64)1);
3152 if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED)
3156 if ((self == UUID_JUST_CREATED || self == (u64)0) &&
3157 peer != UUID_JUST_CREATED)
3161 if (self != UUID_JUST_CREATED &&
3162 (peer == UUID_JUST_CREATED || peer == (u64)0))
3166 int rct, dc; /* roles at crash time */
3168 if (device->p_uuid[UI_BITMAP] == (u64)0 && device->ldev->md.uuid[UI_BITMAP] != (u64)0) {
3170 if (connection->agreed_pro_version < 91)
3173 if ((device->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) &&
3174 (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) {
3175 drbd_info(device, "was SyncSource, missed the resync finished event, corrected myself:\n");
3176 drbd_uuid_move_history(device);
3177 device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP];
3178 device->ldev->md.uuid[UI_BITMAP] = 0;
3180 drbd_uuid_dump(device, "self", device->ldev->md.uuid,
3181 device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0);
3184 drbd_info(device, "was SyncSource (peer failed to write sync_uuid)\n");
3191 if (device->ldev->md.uuid[UI_BITMAP] == (u64)0 && device->p_uuid[UI_BITMAP] != (u64)0) {
3193 if (connection->agreed_pro_version < 91)
3196 if ((device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_BITMAP] & ~((u64)1)) &&
3197 (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1))) {
3198 drbd_info(device, "was SyncTarget, peer missed the resync finished event, corrected peer:\n");
3200 device->p_uuid[UI_HISTORY_START + 1] = device->p_uuid[UI_HISTORY_START];
3201 device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_BITMAP];
3202 device->p_uuid[UI_BITMAP] = 0UL;
3204 drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]);
3207 drbd_info(device, "was SyncTarget (failed to write sync_uuid)\n");
3214 /* Common power [off|failure] */
3215 rct = (test_bit(CRASHED_PRIMARY, &device->flags) ? 1 : 0) +
3216 (device->p_uuid[UI_FLAGS] & 2);
3217 /* lowest bit is set when we were primary,
3218 * next bit (weight 2) is set when peer was primary */
3221 /* Neither has the "crashed primary" flag set,
3222 * only a replication link hickup. */
3226 /* Current UUID equal and no bitmap uuid; does not necessarily
3227 * mean this was a "simultaneous hard crash", maybe IO was
3228 * frozen, so no UUID-bump happened.
3229 * This is a protocol change, overload DRBD_FF_WSAME as flag
3230 * for "new-enough" peer DRBD version. */
3231 if (device->state.role == R_PRIMARY || peer_role == R_PRIMARY) {
3233 if (!(connection->agreed_features & DRBD_FF_WSAME)) {
3234 drbd_warn(peer_device, "Equivalent unrotated UUIDs, but current primary present.\n");
3235 return -(0x10000 | PRO_VERSION_MAX | (DRBD_FF_WSAME << 8));
3237 if (device->state.role == R_PRIMARY && peer_role == R_PRIMARY) {
3238 /* At least one has the "crashed primary" bit set,
3239 * both are primary now, but neither has rotated its UUIDs?
3240 * "Can not happen." */
3241 drbd_err(peer_device, "Equivalent unrotated UUIDs, but both are primary. Can not resolve this.\n");
3244 if (device->state.role == R_PRIMARY)
3249 /* Both are secondary.
3250 * Really looks like recovery from simultaneous hard crash.
3251 * Check which had been primary before, and arbitrate. */
3253 case 0: /* !self_pri && !peer_pri */ return 0; /* already handled */
3254 case 1: /* self_pri && !peer_pri */ return 1;
3255 case 2: /* !self_pri && peer_pri */ return -1;
3256 case 3: /* self_pri && peer_pri */
3257 dc = test_bit(RESOLVE_CONFLICTS, &connection->flags);
3263 peer = device->p_uuid[UI_BITMAP] & ~((u64)1);
3268 peer = device->p_uuid[UI_HISTORY_START] & ~((u64)1);
3270 if (connection->agreed_pro_version < 96 ?
3271 (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) ==
3272 (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) :
3273 peer + UUID_NEW_BM_OFFSET == (device->p_uuid[UI_BITMAP] & ~((u64)1))) {
3274 /* The last P_SYNC_UUID did not get though. Undo the last start of
3275 resync as sync source modifications of the peer's UUIDs. */
3277 if (connection->agreed_pro_version < 91)
3280 device->p_uuid[UI_BITMAP] = device->p_uuid[UI_HISTORY_START];
3281 device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_HISTORY_START + 1];
3283 drbd_info(device, "Lost last syncUUID packet, corrected:\n");
3284 drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]);
3291 self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
3292 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
3293 peer = device->p_uuid[i] & ~((u64)1);
3299 self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
3300 peer = device->p_uuid[UI_CURRENT] & ~((u64)1);
3305 self = device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1);
3307 if (connection->agreed_pro_version < 96 ?
3308 (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) ==
3309 (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) :
3310 self + UUID_NEW_BM_OFFSET == (device->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) {
3311 /* The last P_SYNC_UUID did not get though. Undo the last start of
3312 resync as sync source modifications of our UUIDs. */
3314 if (connection->agreed_pro_version < 91)
3317 __drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_HISTORY_START]);
3318 __drbd_uuid_set(device, UI_HISTORY_START, device->ldev->md.uuid[UI_HISTORY_START + 1]);
3320 drbd_info(device, "Last syncUUID did not get through, corrected:\n");
3321 drbd_uuid_dump(device, "self", device->ldev->md.uuid,
3322 device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0);
3330 peer = device->p_uuid[UI_CURRENT] & ~((u64)1);
3331 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
3332 self = device->ldev->md.uuid[i] & ~((u64)1);
3338 self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
3339 peer = device->p_uuid[UI_BITMAP] & ~((u64)1);
3340 if (self == peer && self != ((u64)0))
3344 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
3345 self = device->ldev->md.uuid[i] & ~((u64)1);
3346 for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) {
3347 peer = device->p_uuid[j] & ~((u64)1);
3356 /* drbd_sync_handshake() returns the new conn state on success, or
3357 CONN_MASK (-1) on failure.
3359 static enum drbd_conns drbd_sync_handshake(struct drbd_peer_device *peer_device,
3360 enum drbd_role peer_role,
3361 enum drbd_disk_state peer_disk) __must_hold(local)
3363 struct drbd_device *device = peer_device->device;
3364 enum drbd_conns rv = C_MASK;
3365 enum drbd_disk_state mydisk;
3366 struct net_conf *nc;
3367 int hg, rule_nr, rr_conflict, tentative, always_asbp;
3369 mydisk = device->state.disk;
3370 if (mydisk == D_NEGOTIATING)
3371 mydisk = device->new_state_tmp.disk;
3373 drbd_info(device, "drbd_sync_handshake:\n");
3375 spin_lock_irq(&device->ldev->md.uuid_lock);
3376 drbd_uuid_dump(device, "self", device->ldev->md.uuid, device->comm_bm_set, 0);
3377 drbd_uuid_dump(device, "peer", device->p_uuid,
3378 device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]);
3380 hg = drbd_uuid_compare(device, peer_role, &rule_nr);
3381 spin_unlock_irq(&device->ldev->md.uuid_lock);
3383 drbd_info(device, "uuid_compare()=%d by rule %d\n", hg, rule_nr);
3386 drbd_alert(device, "Unrelated data, aborting!\n");
3389 if (hg < -0x10000) {
3393 fflags = (hg >> 8) & 0xff;
3394 drbd_alert(device, "To resolve this both sides have to support at least protocol %d and feature flags 0x%x\n",
3399 drbd_alert(device, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000);
3403 if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) ||
3404 (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) {
3405 int f = (hg == -100) || abs(hg) == 2;
3406 hg = mydisk > D_INCONSISTENT ? 1 : -1;
3409 drbd_info(device, "Becoming sync %s due to disk states.\n",
3410 hg > 0 ? "source" : "target");
3414 drbd_khelper(device, "initial-split-brain");
3417 nc = rcu_dereference(peer_device->connection->net_conf);
3418 always_asbp = nc->always_asbp;
3419 rr_conflict = nc->rr_conflict;
3420 tentative = nc->tentative;
3423 if (hg == 100 || (hg == -100 && always_asbp)) {
3424 int pcount = (device->state.role == R_PRIMARY)
3425 + (peer_role == R_PRIMARY);
3426 int forced = (hg == -100);
3430 hg = drbd_asb_recover_0p(peer_device);
3433 hg = drbd_asb_recover_1p(peer_device);
3436 hg = drbd_asb_recover_2p(peer_device);
3439 if (abs(hg) < 100) {
3440 drbd_warn(device, "Split-Brain detected, %d primaries, "
3441 "automatically solved. Sync from %s node\n",
3442 pcount, (hg < 0) ? "peer" : "this");
3444 drbd_warn(device, "Doing a full sync, since"
3445 " UUIDs where ambiguous.\n");
3452 if (test_bit(DISCARD_MY_DATA, &device->flags) && !(device->p_uuid[UI_FLAGS]&1))
3454 if (!test_bit(DISCARD_MY_DATA, &device->flags) && (device->p_uuid[UI_FLAGS]&1))
3458 drbd_warn(device, "Split-Brain detected, manually solved. "
3459 "Sync from %s node\n",
3460 (hg < 0) ? "peer" : "this");
3464 /* FIXME this log message is not correct if we end up here
3465 * after an attempted attach on a diskless node.
3466 * We just refuse to attach -- well, we drop the "connection"
3467 * to that disk, in a way... */
3468 drbd_alert(device, "Split-Brain detected but unresolved, dropping connection!\n");
3469 drbd_khelper(device, "split-brain");
3473 if (hg > 0 && mydisk <= D_INCONSISTENT) {
3474 drbd_err(device, "I shall become SyncSource, but I am inconsistent!\n");
3478 if (hg < 0 && /* by intention we do not use mydisk here. */
3479 device->state.role == R_PRIMARY && device->state.disk >= D_CONSISTENT) {
3480 switch (rr_conflict) {
3481 case ASB_CALL_HELPER:
3482 drbd_khelper(device, "pri-lost");
3484 case ASB_DISCONNECT:
3485 drbd_err(device, "I shall become SyncTarget, but I am primary!\n");
3488 drbd_warn(device, "Becoming SyncTarget, violating the stable-data"
3493 if (tentative || test_bit(CONN_DRY_RUN, &peer_device->connection->flags)) {
3495 drbd_info(device, "dry-run connect: No resync, would become Connected immediately.\n");
3497 drbd_info(device, "dry-run connect: Would become %s, doing a %s resync.",
3498 drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET),
3499 abs(hg) >= 2 ? "full" : "bit-map based");
3504 drbd_info(device, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n");
3505 if (drbd_bitmap_io(device, &drbd_bmio_set_n_write, "set_n_write from sync_handshake",
3506 BM_LOCKED_SET_ALLOWED))
3510 if (hg > 0) { /* become sync source. */
3512 } else if (hg < 0) { /* become sync target */
3516 if (drbd_bm_total_weight(device)) {
3517 drbd_info(device, "No resync, but %lu bits in bitmap!\n",
3518 drbd_bm_total_weight(device));
3525 static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer)
3527 /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */
3528 if (peer == ASB_DISCARD_REMOTE)
3529 return ASB_DISCARD_LOCAL;
3531 /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */
3532 if (peer == ASB_DISCARD_LOCAL)
3533 return ASB_DISCARD_REMOTE;
3535 /* everything else is valid if they are equal on both sides. */
3539 static int receive_protocol(struct drbd_connection *connection, struct packet_info *pi)
3541 struct p_protocol *p = pi->data;
3542 enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p;
3543 int p_proto, p_discard_my_data, p_two_primaries, cf;
3544 struct net_conf *nc, *old_net_conf, *new_net_conf = NULL;
3545 char integrity_alg[SHARED_SECRET_MAX] = "";
3546 struct crypto_shash *peer_integrity_tfm = NULL;
3547 void *int_dig_in = NULL, *int_dig_vv = NULL;
3549 p_proto = be32_to_cpu(p->protocol);
3550 p_after_sb_0p = be32_to_cpu(p->after_sb_0p);
3551 p_after_sb_1p = be32_to_cpu(p->after_sb_1p);
3552 p_after_sb_2p = be32_to_cpu(p->after_sb_2p);
3553 p_two_primaries = be32_to_cpu(p->two_primaries);
3554 cf = be32_to_cpu(p->conn_flags);
3555 p_discard_my_data = cf & CF_DISCARD_MY_DATA;
3557 if (connection->agreed_pro_version >= 87) {
3560 if (pi->size > sizeof(integrity_alg))
3562 err = drbd_recv_all(connection, integrity_alg, pi->size);
3565 integrity_alg[SHARED_SECRET_MAX - 1] = 0;
3568 if (pi->cmd != P_PROTOCOL_UPDATE) {
3569 clear_bit(CONN_DRY_RUN, &connection->flags);
3571 if (cf & CF_DRY_RUN)
3572 set_bit(CONN_DRY_RUN, &connection->flags);
3575 nc = rcu_dereference(connection->net_conf);
3577 if (p_proto != nc->wire_protocol) {
3578 drbd_err(connection, "incompatible %s settings\n", "protocol");
3579 goto disconnect_rcu_unlock;
3582 if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) {
3583 drbd_err(connection, "incompatible %s settings\n", "after-sb-0pri");
3584 goto disconnect_rcu_unlock;
3587 if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) {
3588 drbd_err(connection, "incompatible %s settings\n", "after-sb-1pri");
3589 goto disconnect_rcu_unlock;
3592 if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) {
3593 drbd_err(connection, "incompatible %s settings\n", "after-sb-2pri");
3594 goto disconnect_rcu_unlock;
3597 if (p_discard_my_data && nc->discard_my_data) {
3598 drbd_err(connection, "incompatible %s settings\n", "discard-my-data");
3599 goto disconnect_rcu_unlock;
3602 if (p_two_primaries != nc->two_primaries) {
3603 drbd_err(connection, "incompatible %s settings\n", "allow-two-primaries");
3604 goto disconnect_rcu_unlock;
3607 if (strcmp(integrity_alg, nc->integrity_alg)) {
3608 drbd_err(connection, "incompatible %s settings\n", "data-integrity-alg");
3609 goto disconnect_rcu_unlock;
3615 if (integrity_alg[0]) {
3619 * We can only change the peer data integrity algorithm
3620 * here. Changing our own data integrity algorithm
3621 * requires that we send a P_PROTOCOL_UPDATE packet at
3622 * the same time; otherwise, the peer has no way to
3623 * tell between which packets the algorithm should
3627 peer_integrity_tfm = crypto_alloc_shash(integrity_alg, 0, CRYPTO_ALG_ASYNC);
3628 if (IS_ERR(peer_integrity_tfm)) {
3629 peer_integrity_tfm = NULL;
3630 drbd_err(connection, "peer data-integrity-alg %s not supported\n",
3635 hash_size = crypto_shash_digestsize(peer_integrity_tfm);
3636 int_dig_in = kmalloc(hash_size, GFP_KERNEL);
3637 int_dig_vv = kmalloc(hash_size, GFP_KERNEL);
3638 if (!(int_dig_in && int_dig_vv)) {
3639 drbd_err(connection, "Allocation of buffers for data integrity checking failed\n");
3644 new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL);
3645 if (!new_net_conf) {
3646 drbd_err(connection, "Allocation of new net_conf failed\n");
3650 mutex_lock(&connection->data.mutex);
3651 mutex_lock(&connection->resource->conf_update);
3652 old_net_conf = connection->net_conf;
3653 *new_net_conf = *old_net_conf;
3655 new_net_conf->wire_protocol = p_proto;
3656 new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p);
3657 new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p);
3658 new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p);
3659 new_net_conf->two_primaries = p_two_primaries;
3661 rcu_assign_pointer(connection->net_conf, new_net_conf);
3662 mutex_unlock(&connection->resource->conf_update);
3663 mutex_unlock(&connection->data.mutex);
3665 crypto_free_shash(connection->peer_integrity_tfm);
3666 kfree(connection->int_dig_in);
3667 kfree(connection->int_dig_vv);
3668 connection->peer_integrity_tfm = peer_integrity_tfm;
3669 connection->int_dig_in = int_dig_in;
3670 connection->int_dig_vv = int_dig_vv;
3672 if (strcmp(old_net_conf->integrity_alg, integrity_alg))
3673 drbd_info(connection, "peer data-integrity-alg: %s\n",
3674 integrity_alg[0] ? integrity_alg : "(none)");
3677 kfree(old_net_conf);
3680 disconnect_rcu_unlock:
3683 crypto_free_shash(peer_integrity_tfm);
3686 conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD);
3691 * input: alg name, feature name
3692 * return: NULL (alg name was "")
3693 * ERR_PTR(error) if something goes wrong
3694 * or the crypto hash ptr, if it worked out ok. */
3695 static struct crypto_shash *drbd_crypto_alloc_digest_safe(
3696 const struct drbd_device *device,
3697 const char *alg, const char *name)
3699 struct crypto_shash *tfm;
3704 tfm = crypto_alloc_shash(alg, 0, 0);
3706 drbd_err(device, "Can not allocate \"%s\" as %s (reason: %ld)\n",
3707 alg, name, PTR_ERR(tfm));
3713 static int ignore_remaining_packet(struct drbd_connection *connection, struct packet_info *pi)
3715 void *buffer = connection->data.rbuf;
3716 int size = pi->size;
3719 int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE);
3720 s = drbd_recv(connection, buffer, s);
3734 * config_unknown_volume - device configuration command for unknown volume
3736 * When a device is added to an existing connection, the node on which the
3737 * device is added first will send configuration commands to its peer but the
3738 * peer will not know about the device yet. It will warn and ignore these
3739 * commands. Once the device is added on the second node, the second node will
3740 * send the same device configuration commands, but in the other direction.
3742 * (We can also end up here if drbd is misconfigured.)
3744 static int config_unknown_volume(struct drbd_connection *connection, struct packet_info *pi)
3746 drbd_warn(connection, "%s packet received for volume %u, which is not configured locally\n",
3747 cmdname(pi->cmd), pi->vnr);
3748 return ignore_remaining_packet(connection, pi);
3751 static int receive_SyncParam(struct drbd_connection *connection, struct packet_info *pi)
3753 struct drbd_peer_device *peer_device;
3754 struct drbd_device *device;
3755 struct p_rs_param_95 *p;
3756 unsigned int header_size, data_size, exp_max_sz;
3757 struct crypto_shash *verify_tfm = NULL;
3758 struct crypto_shash *csums_tfm = NULL;
3759 struct net_conf *old_net_conf, *new_net_conf = NULL;
3760 struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL;
3761 const int apv = connection->agreed_pro_version;
3762 struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
3766 peer_device = conn_peer_device(connection, pi->vnr);
3768 return config_unknown_volume(connection, pi);
3769 device = peer_device->device;
3771 exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param)
3772 : apv == 88 ? sizeof(struct p_rs_param)
3774 : apv <= 94 ? sizeof(struct p_rs_param_89)
3775 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
3777 if (pi->size > exp_max_sz) {
3778 drbd_err(device, "SyncParam packet too long: received %u, expected <= %u bytes\n",
3779 pi->size, exp_max_sz);
3784 header_size = sizeof(struct p_rs_param);
3785 data_size = pi->size - header_size;
3786 } else if (apv <= 94) {
3787 header_size = sizeof(struct p_rs_param_89);
3788 data_size = pi->size - header_size;
3789 D_ASSERT(device, data_size == 0);
3791 header_size = sizeof(struct p_rs_param_95);
3792 data_size = pi->size - header_size;
3793 D_ASSERT(device, data_size == 0);
3796 /* initialize verify_alg and csums_alg */
3798 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
3800 err = drbd_recv_all(peer_device->connection, p, header_size);
3804 mutex_lock(&connection->resource->conf_update);
3805 old_net_conf = peer_device->connection->net_conf;
3806 if (get_ldev(device)) {
3807 new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
3808 if (!new_disk_conf) {
3810 mutex_unlock(&connection->resource->conf_update);
3811 drbd_err(device, "Allocation of new disk_conf failed\n");
3815 old_disk_conf = device->ldev->disk_conf;
3816 *new_disk_conf = *old_disk_conf;
3818 new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate);
3823 if (data_size > SHARED_SECRET_MAX || data_size == 0) {
3824 drbd_err(device, "verify-alg of wrong size, "
3825 "peer wants %u, accepting only up to %u byte\n",
3826 data_size, SHARED_SECRET_MAX);
3831 err = drbd_recv_all(peer_device->connection, p->verify_alg, data_size);
3834 /* we expect NUL terminated string */
3835 /* but just in case someone tries to be evil */
3836 D_ASSERT(device, p->verify_alg[data_size-1] == 0);
3837 p->verify_alg[data_size-1] = 0;
3839 } else /* apv >= 89 */ {
3840 /* we still expect NUL terminated strings */
3841 /* but just in case someone tries to be evil */
3842 D_ASSERT(device, p->verify_alg[SHARED_SECRET_MAX-1] == 0);
3843 D_ASSERT(device, p->csums_alg[SHARED_SECRET_MAX-1] == 0);
3844 p->verify_alg[SHARED_SECRET_MAX-1] = 0;
3845 p->csums_alg[SHARED_SECRET_MAX-1] = 0;
3848 if (strcmp(old_net_conf->verify_alg, p->verify_alg)) {
3849 if (device->state.conn == C_WF_REPORT_PARAMS) {
3850 drbd_err(device, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n",
3851 old_net_conf->verify_alg, p->verify_alg);
3854 verify_tfm = drbd_crypto_alloc_digest_safe(device,
3855 p->verify_alg, "verify-alg");
3856 if (IS_ERR(verify_tfm)) {
3862 if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) {
3863 if (device->state.conn == C_WF_REPORT_PARAMS) {
3864 drbd_err(device, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n",
3865 old_net_conf->csums_alg, p->csums_alg);
3868 csums_tfm = drbd_crypto_alloc_digest_safe(device,
3869 p->csums_alg, "csums-alg");
3870 if (IS_ERR(csums_tfm)) {
3876 if (apv > 94 && new_disk_conf) {
3877 new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead);
3878 new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target);
3879 new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target);
3880 new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate);
3882 fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
3883 if (fifo_size != device->rs_plan_s->size) {
3884 new_plan = fifo_alloc(fifo_size);
3886 drbd_err(device, "kmalloc of fifo_buffer failed");
3893 if (verify_tfm || csums_tfm) {
3894 new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
3895 if (!new_net_conf) {
3896 drbd_err(device, "Allocation of new net_conf failed\n");
3900 *new_net_conf = *old_net_conf;
3903 strcpy(new_net_conf->verify_alg, p->verify_alg);
3904 new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1;
3905 crypto_free_shash(peer_device->connection->verify_tfm);
3906 peer_device->connection->verify_tfm = verify_tfm;
3907 drbd_info(device, "using verify-alg: \"%s\"\n", p->verify_alg);
3910 strcpy(new_net_conf->csums_alg, p->csums_alg);
3911 new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1;
3912 crypto_free_shash(peer_device->connection->csums_tfm);
3913 peer_device->connection->csums_tfm = csums_tfm;
3914 drbd_info(device, "using csums-alg: \"%s\"\n", p->csums_alg);
3916 rcu_assign_pointer(connection->net_conf, new_net_conf);
3920 if (new_disk_conf) {
3921 rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
3926 old_plan = device->rs_plan_s;
3927 rcu_assign_pointer(device->rs_plan_s, new_plan);
3930 mutex_unlock(&connection->resource->conf_update);
3933 kfree(old_net_conf);
3934 kfree(old_disk_conf);
3940 if (new_disk_conf) {
3942 kfree(new_disk_conf);
3944 mutex_unlock(&connection->resource->conf_update);
3949 if (new_disk_conf) {
3951 kfree(new_disk_conf);
3953 mutex_unlock(&connection->resource->conf_update);
3954 /* just for completeness: actually not needed,
3955 * as this is not reached if csums_tfm was ok. */
3956 crypto_free_shash(csums_tfm);
3957 /* but free the verify_tfm again, if csums_tfm did not work out */
3958 crypto_free_shash(verify_tfm);
3959 conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD);
3963 /* warn if the arguments differ by more than 12.5% */
3964 static void warn_if_differ_considerably(struct drbd_device *device,
3965 const char *s, sector_t a, sector_t b)
3968 if (a == 0 || b == 0)
3970 d = (a > b) ? (a - b) : (b - a);
3971 if (d > (a>>3) || d > (b>>3))
3972 drbd_warn(device, "Considerable difference in %s: %llus vs. %llus\n", s,
3973 (unsigned long long)a, (unsigned long long)b);
3976 static int receive_sizes(struct drbd_connection *connection, struct packet_info *pi)
3978 struct drbd_peer_device *peer_device;
3979 struct drbd_device *device;
3980 struct p_sizes *p = pi->data;
3981 struct o_qlim *o = (connection->agreed_features & DRBD_FF_WSAME) ? p->qlim : NULL;
3982 enum determine_dev_size dd = DS_UNCHANGED;
3983 sector_t p_size, p_usize, p_csize, my_usize;
3984 int ldsc = 0; /* local disk size changed */
3985 enum dds_flags ddsf;
3987 peer_device = conn_peer_device(connection, pi->vnr);
3989 return config_unknown_volume(connection, pi);
3990 device = peer_device->device;
3992 p_size = be64_to_cpu(p->d_size);
3993 p_usize = be64_to_cpu(p->u_size);
3994 p_csize = be64_to_cpu(p->c_size);
3996 /* just store the peer's disk size for now.
3997 * we still need to figure out whether we accept that. */
3998 device->p_size = p_size;
4000 if (get_ldev(device)) {
4001 sector_t new_size, cur_size;
4003 my_usize = rcu_dereference(device->ldev->disk_conf)->disk_size;
4006 warn_if_differ_considerably(device, "lower level device sizes",
4007 p_size, drbd_get_max_capacity(device->ldev));
4008 warn_if_differ_considerably(device, "user requested size",
4011 /* if this is the first connect, or an otherwise expected
4012 * param exchange, choose the minimum */
4013 if (device->state.conn == C_WF_REPORT_PARAMS)
4014 p_usize = min_not_zero(my_usize, p_usize);
4016 /* Never shrink a device with usable data during connect.
4017 But allow online shrinking if we are connected. */
4018 new_size = drbd_new_dev_size(device, device->ldev, p_usize, 0);
4019 cur_size = drbd_get_capacity(device->this_bdev);
4020 if (new_size < cur_size &&
4021 device->state.disk >= D_OUTDATED &&
4022 device->state.conn < C_CONNECTED) {
4023 drbd_err(device, "The peer's disk size is too small! (%llu < %llu sectors)\n",
4024 (unsigned long long)new_size, (unsigned long long)cur_size);
4025 conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD);
4030 if (my_usize != p_usize) {
4031 struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
4033 new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
4034 if (!new_disk_conf) {
4035 drbd_err(device, "Allocation of new disk_conf failed\n");
4040 mutex_lock(&connection->resource->conf_update);
4041 old_disk_conf = device->ldev->disk_conf;
4042 *new_disk_conf = *old_disk_conf;
4043 new_disk_conf->disk_size = p_usize;
4045 rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
4046 mutex_unlock(&connection->resource->conf_update);
4048 kfree(old_disk_conf);
4050 drbd_info(device, "Peer sets u_size to %lu sectors\n",
4051 (unsigned long)my_usize);
4057 device->peer_max_bio_size = be32_to_cpu(p->max_bio_size);
4058 /* Leave drbd_reconsider_queue_parameters() before drbd_determine_dev_size().
4059 In case we cleared the QUEUE_FLAG_DISCARD from our queue in
4060 drbd_reconsider_queue_parameters(), we can be sure that after
4061 drbd_determine_dev_size() no REQ_DISCARDs are in the queue. */
4063 ddsf = be16_to_cpu(p->dds_flags);
4064 if (get_ldev(device)) {
4065 drbd_reconsider_queue_parameters(device, device->ldev, o);
4066 dd = drbd_determine_dev_size(device, ddsf, NULL);
4070 drbd_md_sync(device);
4073 * I am diskless, need to accept the peer's *current* size.
4074 * I must NOT accept the peers backing disk size,
4075 * it may have been larger than mine all along...
4077 * At this point, the peer knows more about my disk, or at
4078 * least about what we last agreed upon, than myself.
4079 * So if his c_size is less than his d_size, the most likely
4080 * reason is that *my* d_size was smaller last time we checked.
4082 * However, if he sends a zero current size,
4083 * take his (user-capped or) backing disk size anyways.
4085 drbd_reconsider_queue_parameters(device, NULL, o);
4086 drbd_set_my_capacity(device, p_csize ?: p_usize ?: p_size);
4089 if (get_ldev(device)) {
4090 if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev)) {
4091 device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev);
4098 if (device->state.conn > C_WF_REPORT_PARAMS) {
4099 if (be64_to_cpu(p->c_size) !=
4100 drbd_get_capacity(device->this_bdev) || ldsc) {
4101 /* we have different sizes, probably peer
4102 * needs to know my new size... */
4103 drbd_send_sizes(peer_device, 0, ddsf);
4105 if (test_and_clear_bit(RESIZE_PENDING, &device->flags) ||
4106 (dd == DS_GREW && device->state.conn == C_CONNECTED)) {
4107 if (device->state.pdsk >= D_INCONSISTENT &&
4108 device->state.disk >= D_INCONSISTENT) {
4109 if (ddsf & DDSF_NO_RESYNC)
4110 drbd_info(device, "Resync of new storage suppressed with --assume-clean\n");
4112 resync_after_online_grow(device);
4114 set_bit(RESYNC_AFTER_NEG, &device->flags);
4121 static int receive_uuids(struct drbd_connection *connection, struct packet_info *pi)
4123 struct drbd_peer_device *peer_device;
4124 struct drbd_device *device;
4125 struct p_uuids *p = pi->data;
4127 int i, updated_uuids = 0;
4129 peer_device = conn_peer_device(connection, pi->vnr);
4131 return config_unknown_volume(connection, pi);
4132 device = peer_device->device;
4134 p_uuid = kmalloc_array(UI_EXTENDED_SIZE, sizeof(*p_uuid), GFP_NOIO);
4136 drbd_err(device, "kmalloc of p_uuid failed\n");
4140 for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++)
4141 p_uuid[i] = be64_to_cpu(p->uuid[i]);
4143 kfree(device->p_uuid);
4144 device->p_uuid = p_uuid;
4146 if (device->state.conn < C_CONNECTED &&
4147 device->state.disk < D_INCONSISTENT &&
4148 device->state.role == R_PRIMARY &&
4149 (device->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) {
4150 drbd_err(device, "Can only connect to data with current UUID=%016llX\n",
4151 (unsigned long long)device->ed_uuid);
4152 conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD);
4156 if (get_ldev(device)) {
4157 int skip_initial_sync =
4158 device->state.conn == C_CONNECTED &&
4159 peer_device->connection->agreed_pro_version >= 90 &&
4160 device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED &&
4161 (p_uuid[UI_FLAGS] & 8);
4162 if (skip_initial_sync) {
4163 drbd_info(device, "Accepted new current UUID, preparing to skip initial sync\n");
4164 drbd_bitmap_io(device, &drbd_bmio_clear_n_write,
4165 "clear_n_write from receive_uuids",
4166 BM_LOCKED_TEST_ALLOWED);
4167 _drbd_uuid_set(device, UI_CURRENT, p_uuid[UI_CURRENT]);
4168 _drbd_uuid_set(device, UI_BITMAP, 0);
4169 _drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
4171 drbd_md_sync(device);
4175 } else if (device->state.disk < D_INCONSISTENT &&
4176 device->state.role == R_PRIMARY) {
4177 /* I am a diskless primary, the peer just created a new current UUID
4179 updated_uuids = drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]);
4182 /* Before we test for the disk state, we should wait until an eventually
4183 ongoing cluster wide state change is finished. That is important if
4184 we are primary and are detaching from our disk. We need to see the
4185 new disk state... */
4186 mutex_lock(device->state_mutex);
4187 mutex_unlock(device->state_mutex);
4188 if (device->state.conn >= C_CONNECTED && device->state.disk < D_INCONSISTENT)
4189 updated_uuids |= drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]);
4192 drbd_print_uuids(device, "receiver updated UUIDs to");
4198 * convert_state() - Converts the peer's view of the cluster state to our point of view
4199 * @ps: The state as seen by the peer.
4201 static union drbd_state convert_state(union drbd_state ps)
4203 union drbd_state ms;
4205 static enum drbd_conns c_tab[] = {
4206 [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS,
4207 [C_CONNECTED] = C_CONNECTED,
4209 [C_STARTING_SYNC_S] = C_STARTING_SYNC_T,
4210 [C_STARTING_SYNC_T] = C_STARTING_SYNC_S,
4211 [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */
4212 [C_VERIFY_S] = C_VERIFY_T,
4218 ms.conn = c_tab[ps.conn];
4223 ms.peer_isp = (ps.aftr_isp | ps.user_isp);
4228 static int receive_req_state(struct drbd_connection *connection, struct packet_info *pi)
4230 struct drbd_peer_device *peer_device;
4231 struct drbd_device *device;
4232 struct p_req_state *p = pi->data;
4233 union drbd_state mask, val;
4234 enum drbd_state_rv rv;
4236 peer_device = conn_peer_device(connection, pi->vnr);
4239 device = peer_device->device;
4241 mask.i = be32_to_cpu(p->mask);
4242 val.i = be32_to_cpu(p->val);
4244 if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) &&
4245 mutex_is_locked(device->state_mutex)) {
4246 drbd_send_sr_reply(peer_device, SS_CONCURRENT_ST_CHG);
4250 mask = convert_state(mask);
4251 val = convert_state(val);
4253 rv = drbd_change_state(device, CS_VERBOSE, mask, val);
4254 drbd_send_sr_reply(peer_device, rv);
4256 drbd_md_sync(device);
4261 static int receive_req_conn_state(struct drbd_connection *connection, struct packet_info *pi)
4263 struct p_req_state *p = pi->data;
4264 union drbd_state mask, val;
4265 enum drbd_state_rv rv;
4267 mask.i = be32_to_cpu(p->mask);
4268 val.i = be32_to_cpu(p->val);
4270 if (test_bit(RESOLVE_CONFLICTS, &connection->flags) &&
4271 mutex_is_locked(&connection->cstate_mutex)) {
4272 conn_send_sr_reply(connection, SS_CONCURRENT_ST_CHG);
4276 mask = convert_state(mask);
4277 val = convert_state(val);
4279 rv = conn_request_state(connection, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL);
4280 conn_send_sr_reply(connection, rv);
4285 static int receive_state(struct drbd_connection *connection, struct packet_info *pi)
4287 struct drbd_peer_device *peer_device;
4288 struct drbd_device *device;
4289 struct p_state *p = pi->data;
4290 union drbd_state os, ns, peer_state;
4291 enum drbd_disk_state real_peer_disk;
4292 enum chg_state_flags cs_flags;
4295 peer_device = conn_peer_device(connection, pi->vnr);
4297 return config_unknown_volume(connection, pi);
4298 device = peer_device->device;
4300 peer_state.i = be32_to_cpu(p->state);
4302 real_peer_disk = peer_state.disk;
4303 if (peer_state.disk == D_NEGOTIATING) {
4304 real_peer_disk = device->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT;
4305 drbd_info(device, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk));
4308 spin_lock_irq(&device->resource->req_lock);
4310 os = ns = drbd_read_state(device);
4311 spin_unlock_irq(&device->resource->req_lock);
4313 /* If some other part of the code (ack_receiver thread, timeout)
4314 * already decided to close the connection again,
4315 * we must not "re-establish" it here. */
4316 if (os.conn <= C_TEAR_DOWN)
4319 /* If this is the "end of sync" confirmation, usually the peer disk
4320 * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits
4321 * set) resync started in PausedSyncT, or if the timing of pause-/
4322 * unpause-sync events has been "just right", the peer disk may
4323 * transition from D_CONSISTENT to D_UP_TO_DATE as well.
4325 if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) &&
4326 real_peer_disk == D_UP_TO_DATE &&
4327 os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) {
4328 /* If we are (becoming) SyncSource, but peer is still in sync
4329 * preparation, ignore its uptodate-ness to avoid flapping, it
4330 * will change to inconsistent once the peer reaches active
4332 * It may have changed syncer-paused flags, however, so we
4333 * cannot ignore this completely. */
4334 if (peer_state.conn > C_CONNECTED &&
4335 peer_state.conn < C_SYNC_SOURCE)
4336 real_peer_disk = D_INCONSISTENT;
4338 /* if peer_state changes to connected at the same time,
4339 * it explicitly notifies us that it finished resync.
4340 * Maybe we should finish it up, too? */
4341 else if (os.conn >= C_SYNC_SOURCE &&
4342 peer_state.conn == C_CONNECTED) {
4343 if (drbd_bm_total_weight(device) <= device->rs_failed)
4344 drbd_resync_finished(device);
4349 /* explicit verify finished notification, stop sector reached. */
4350 if (os.conn == C_VERIFY_T && os.disk == D_UP_TO_DATE &&
4351 peer_state.conn == C_CONNECTED && real_peer_disk == D_UP_TO_DATE) {
4352 ov_out_of_sync_print(device);
4353 drbd_resync_finished(device);
4357 /* peer says his disk is inconsistent, while we think it is uptodate,
4358 * and this happens while the peer still thinks we have a sync going on,
4359 * but we think we are already done with the sync.
4360 * We ignore this to avoid flapping pdsk.
4361 * This should not happen, if the peer is a recent version of drbd. */
4362 if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT &&
4363 os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE)
4364 real_peer_disk = D_UP_TO_DATE;
4366 if (ns.conn == C_WF_REPORT_PARAMS)
4367 ns.conn = C_CONNECTED;
4369 if (peer_state.conn == C_AHEAD)
4372 if (device->p_uuid && peer_state.disk >= D_NEGOTIATING &&
4373 get_ldev_if_state(device, D_NEGOTIATING)) {
4374 int cr; /* consider resync */
4376 /* if we established a new connection */
4377 cr = (os.conn < C_CONNECTED);
4378 /* if we had an established connection
4379 * and one of the nodes newly attaches a disk */
4380 cr |= (os.conn == C_CONNECTED &&
4381 (peer_state.disk == D_NEGOTIATING ||
4382 os.disk == D_NEGOTIATING));
4383 /* if we have both been inconsistent, and the peer has been
4384 * forced to be UpToDate with --overwrite-data */
4385 cr |= test_bit(CONSIDER_RESYNC, &device->flags);
4386 /* if we had been plain connected, and the admin requested to
4387 * start a sync by "invalidate" or "invalidate-remote" */
4388 cr |= (os.conn == C_CONNECTED &&
4389 (peer_state.conn >= C_STARTING_SYNC_S &&
4390 peer_state.conn <= C_WF_BITMAP_T));
4393 ns.conn = drbd_sync_handshake(peer_device, peer_state.role, real_peer_disk);
4396 if (ns.conn == C_MASK) {
4397 ns.conn = C_CONNECTED;
4398 if (device->state.disk == D_NEGOTIATING) {
4399 drbd_force_state(device, NS(disk, D_FAILED));
4400 } else if (peer_state.disk == D_NEGOTIATING) {
4401 drbd_err(device, "Disk attach process on the peer node was aborted.\n");
4402 peer_state.disk = D_DISKLESS;
4403 real_peer_disk = D_DISKLESS;
4405 if (test_and_clear_bit(CONN_DRY_RUN, &peer_device->connection->flags))
4407 D_ASSERT(device, os.conn == C_WF_REPORT_PARAMS);
4408 conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD);
4414 spin_lock_irq(&device->resource->req_lock);
4415 if (os.i != drbd_read_state(device).i)
4417 clear_bit(CONSIDER_RESYNC, &device->flags);
4418 ns.peer = peer_state.role;
4419 ns.pdsk = real_peer_disk;
4420 ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp);
4421 if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING)
4422 ns.disk = device->new_state_tmp.disk;
4423 cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD);
4424 if (ns.pdsk == D_CONSISTENT && drbd_suspended(device) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED &&
4425 test_bit(NEW_CUR_UUID, &device->flags)) {
4426 /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this
4427 for temporal network outages! */
4428 spin_unlock_irq(&device->resource->req_lock);
4429 drbd_err(device, "Aborting Connect, can not thaw IO with an only Consistent peer\n");
4430 tl_clear(peer_device->connection);
4431 drbd_uuid_new_current(device);
4432 clear_bit(NEW_CUR_UUID, &device->flags);
4433 conn_request_state(peer_device->connection, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD);
4436 rv = _drbd_set_state(device, ns, cs_flags, NULL);
4437 ns = drbd_read_state(device);
4438 spin_unlock_irq(&device->resource->req_lock);
4440 if (rv < SS_SUCCESS) {
4441 conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD);
4445 if (os.conn > C_WF_REPORT_PARAMS) {
4446 if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED &&
4447 peer_state.disk != D_NEGOTIATING ) {
4448 /* we want resync, peer has not yet decided to sync... */
4449 /* Nowadays only used when forcing a node into primary role and
4450 setting its disk to UpToDate with that */
4451 drbd_send_uuids(peer_device);
4452 drbd_send_current_state(peer_device);
4456 clear_bit(DISCARD_MY_DATA, &device->flags);
4458 drbd_md_sync(device); /* update connected indicator, la_size_sect, ... */
4463 static int receive_sync_uuid(struct drbd_connection *connection, struct packet_info *pi)
4465 struct drbd_peer_device *peer_device;
4466 struct drbd_device *device;
4467 struct p_rs_uuid *p = pi->data;
4469 peer_device = conn_peer_device(connection, pi->vnr);
4472 device = peer_device->device;
4474 wait_event(device->misc_wait,
4475 device->state.conn == C_WF_SYNC_UUID ||
4476 device->state.conn == C_BEHIND ||
4477 device->state.conn < C_CONNECTED ||
4478 device->state.disk < D_NEGOTIATING);
4480 /* D_ASSERT(device, device->state.conn == C_WF_SYNC_UUID ); */
4482 /* Here the _drbd_uuid_ functions are right, current should
4483 _not_ be rotated into the history */
4484 if (get_ldev_if_state(device, D_NEGOTIATING)) {
4485 _drbd_uuid_set(device, UI_CURRENT, be64_to_cpu(p->uuid));
4486 _drbd_uuid_set(device, UI_BITMAP, 0UL);
4488 drbd_print_uuids(device, "updated sync uuid");
4489 drbd_start_resync(device, C_SYNC_TARGET);
4493 drbd_err(device, "Ignoring SyncUUID packet!\n");
4499 * receive_bitmap_plain
4501 * Return 0 when done, 1 when another iteration is needed, and a negative error
4502 * code upon failure.
4505 receive_bitmap_plain(struct drbd_peer_device *peer_device, unsigned int size,
4506 unsigned long *p, struct bm_xfer_ctx *c)
4508 unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE -
4509 drbd_header_size(peer_device->connection);
4510 unsigned int num_words = min_t(size_t, data_size / sizeof(*p),
4511 c->bm_words - c->word_offset);
4512 unsigned int want = num_words * sizeof(*p);
4516 drbd_err(peer_device, "%s:want (%u) != size (%u)\n", __func__, want, size);
4521 err = drbd_recv_all(peer_device->connection, p, want);
4525 drbd_bm_merge_lel(peer_device->device, c->word_offset, num_words, p);
4527 c->word_offset += num_words;
4528 c->bit_offset = c->word_offset * BITS_PER_LONG;
4529 if (c->bit_offset > c->bm_bits)
4530 c->bit_offset = c->bm_bits;
4535 static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p)
4537 return (enum drbd_bitmap_code)(p->encoding & 0x0f);
4540 static int dcbp_get_start(struct p_compressed_bm *p)
4542 return (p->encoding & 0x80) != 0;
4545 static int dcbp_get_pad_bits(struct p_compressed_bm *p)
4547 return (p->encoding >> 4) & 0x7;
4553 * Return 0 when done, 1 when another iteration is needed, and a negative error
4554 * code upon failure.
4557 recv_bm_rle_bits(struct drbd_peer_device *peer_device,
4558 struct p_compressed_bm *p,
4559 struct bm_xfer_ctx *c,
4562 struct bitstream bs;
4566 unsigned long s = c->bit_offset;
4568 int toggle = dcbp_get_start(p);
4572 bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p));
4574 bits = bitstream_get_bits(&bs, &look_ahead, 64);
4578 for (have = bits; have > 0; s += rl, toggle = !toggle) {
4579 bits = vli_decode_bits(&rl, look_ahead);
4585 if (e >= c->bm_bits) {
4586 drbd_err(peer_device, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e);
4589 _drbd_bm_set_bits(peer_device->device, s, e);
4593 drbd_err(peer_device, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n",
4594 have, bits, look_ahead,
4595 (unsigned int)(bs.cur.b - p->code),
4596 (unsigned int)bs.buf_len);
4599 /* if we consumed all 64 bits, assign 0; >> 64 is "undefined"; */
4600 if (likely(bits < 64))
4601 look_ahead >>= bits;
4606 bits = bitstream_get_bits(&bs, &tmp, 64 - have);
4609 look_ahead |= tmp << have;
4614 bm_xfer_ctx_bit_to_word_offset(c);
4616 return (s != c->bm_bits);
4622 * Return 0 when done, 1 when another iteration is needed, and a negative error
4623 * code upon failure.
4626 decode_bitmap_c(struct drbd_peer_device *peer_device,
4627 struct p_compressed_bm *p,
4628 struct bm_xfer_ctx *c,
4631 if (dcbp_get_code(p) == RLE_VLI_Bits)
4632 return recv_bm_rle_bits(peer_device, p, c, len - sizeof(*p));
4634 /* other variants had been implemented for evaluation,
4635 * but have been dropped as this one turned out to be "best"
4636 * during all our tests. */
4638 drbd_err(peer_device, "receive_bitmap_c: unknown encoding %u\n", p->encoding);
4639 conn_request_state(peer_device->connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD);
4643 void INFO_bm_xfer_stats(struct drbd_device *device,
4644 const char *direction, struct bm_xfer_ctx *c)
4646 /* what would it take to transfer it "plaintext" */
4647 unsigned int header_size = drbd_header_size(first_peer_device(device)->connection);
4648 unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size;
4649 unsigned int plain =
4650 header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) +
4651 c->bm_words * sizeof(unsigned long);
4652 unsigned int total = c->bytes[0] + c->bytes[1];
4655 /* total can not be zero. but just in case: */
4659 /* don't report if not compressed */
4663 /* total < plain. check for overflow, still */
4664 r = (total > UINT_MAX/1000) ? (total / (plain/1000))
4665 : (1000 * total / plain);
4671 drbd_info(device, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), "
4672 "total %u; compression: %u.%u%%\n",
4674 c->bytes[1], c->packets[1],
4675 c->bytes[0], c->packets[0],
4676 total, r/10, r % 10);
4679 /* Since we are processing the bitfield from lower addresses to higher,
4680 it does not matter if the process it in 32 bit chunks or 64 bit
4681 chunks as long as it is little endian. (Understand it as byte stream,
4682 beginning with the lowest byte...) If we would use big endian
4683 we would need to process it from the highest address to the lowest,
4684 in order to be agnostic to the 32 vs 64 bits issue.
4686 returns 0 on failure, 1 if we successfully received it. */
4687 static int receive_bitmap(struct drbd_connection *connection, struct packet_info *pi)
4689 struct drbd_peer_device *peer_device;
4690 struct drbd_device *device;
4691 struct bm_xfer_ctx c;
4694 peer_device = conn_peer_device(connection, pi->vnr);
4697 device = peer_device->device;
4699 drbd_bm_lock(device, "receive bitmap", BM_LOCKED_SET_ALLOWED);
4700 /* you are supposed to send additional out-of-sync information
4701 * if you actually set bits during this phase */
4703 c = (struct bm_xfer_ctx) {
4704 .bm_bits = drbd_bm_bits(device),
4705 .bm_words = drbd_bm_words(device),
4709 if (pi->cmd == P_BITMAP)
4710 err = receive_bitmap_plain(peer_device, pi->size, pi->data, &c);
4711 else if (pi->cmd == P_COMPRESSED_BITMAP) {
4712 /* MAYBE: sanity check that we speak proto >= 90,
4713 * and the feature is enabled! */
4714 struct p_compressed_bm *p = pi->data;
4716 if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(connection)) {
4717 drbd_err(device, "ReportCBitmap packet too large\n");
4721 if (pi->size <= sizeof(*p)) {
4722 drbd_err(device, "ReportCBitmap packet too small (l:%u)\n", pi->size);
4726 err = drbd_recv_all(peer_device->connection, p, pi->size);
4729 err = decode_bitmap_c(peer_device, p, &c, pi->size);
4731 drbd_warn(device, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd);
4736 c.packets[pi->cmd == P_BITMAP]++;
4737 c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(connection) + pi->size;
4744 err = drbd_recv_header(peer_device->connection, pi);
4749 INFO_bm_xfer_stats(device, "receive", &c);
4751 if (device->state.conn == C_WF_BITMAP_T) {
4752 enum drbd_state_rv rv;
4754 err = drbd_send_bitmap(device);
4757 /* Omit CS_ORDERED with this state transition to avoid deadlocks. */
4758 rv = _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
4759 D_ASSERT(device, rv == SS_SUCCESS);
4760 } else if (device->state.conn != C_WF_BITMAP_S) {
4761 /* admin may have requested C_DISCONNECTING,
4762 * other threads may have noticed network errors */
4763 drbd_info(device, "unexpected cstate (%s) in receive_bitmap\n",
4764 drbd_conn_str(device->state.conn));
4769 drbd_bm_unlock(device);
4770 if (!err && device->state.conn == C_WF_BITMAP_S)
4771 drbd_start_resync(device, C_SYNC_SOURCE);
4775 static int receive_skip(struct drbd_connection *connection, struct packet_info *pi)
4777 drbd_warn(connection, "skipping unknown optional packet type %d, l: %d!\n",
4780 return ignore_remaining_packet(connection, pi);
4783 static int receive_UnplugRemote(struct drbd_connection *connection, struct packet_info *pi)
4785 /* Make sure we've acked all the TCP data associated
4786 * with the data requests being unplugged */
4787 drbd_tcp_quickack(connection->data.socket);
4792 static int receive_out_of_sync(struct drbd_connection *connection, struct packet_info *pi)
4794 struct drbd_peer_device *peer_device;
4795 struct drbd_device *device;
4796 struct p_block_desc *p = pi->data;
4798 peer_device = conn_peer_device(connection, pi->vnr);
4801 device = peer_device->device;
4803 switch (device->state.conn) {
4804 case C_WF_SYNC_UUID:
4809 drbd_err(device, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n",
4810 drbd_conn_str(device->state.conn));
4813 drbd_set_out_of_sync(device, be64_to_cpu(p->sector), be32_to_cpu(p->blksize));
4818 static int receive_rs_deallocated(struct drbd_connection *connection, struct packet_info *pi)
4820 struct drbd_peer_device *peer_device;
4821 struct p_block_desc *p = pi->data;
4822 struct drbd_device *device;
4826 peer_device = conn_peer_device(connection, pi->vnr);
4829 device = peer_device->device;
4831 sector = be64_to_cpu(p->sector);
4832 size = be32_to_cpu(p->blksize);
4834 dec_rs_pending(device);
4836 if (get_ldev(device)) {
4837 struct drbd_peer_request *peer_req;
4838 const int op = REQ_OP_WRITE_ZEROES;
4840 peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER, sector,
4847 peer_req->w.cb = e_end_resync_block;
4848 peer_req->submit_jif = jiffies;
4849 peer_req->flags |= EE_IS_TRIM;
4851 spin_lock_irq(&device->resource->req_lock);
4852 list_add_tail(&peer_req->w.list, &device->sync_ee);
4853 spin_unlock_irq(&device->resource->req_lock);
4855 atomic_add(pi->size >> 9, &device->rs_sect_ev);
4856 err = drbd_submit_peer_request(device, peer_req, op, 0, DRBD_FAULT_RS_WR);
4859 spin_lock_irq(&device->resource->req_lock);
4860 list_del(&peer_req->w.list);
4861 spin_unlock_irq(&device->resource->req_lock);
4863 drbd_free_peer_req(device, peer_req);
4869 inc_unacked(device);
4871 /* No put_ldev() here. Gets called in drbd_endio_write_sec_final(),
4872 as well as drbd_rs_complete_io() */
4875 drbd_rs_complete_io(device, sector);
4876 drbd_send_ack_ex(peer_device, P_NEG_ACK, sector, size, ID_SYNCER);
4879 atomic_add(size >> 9, &device->rs_sect_in);
4886 unsigned int pkt_size;
4887 int (*fn)(struct drbd_connection *, struct packet_info *);
4890 static struct data_cmd drbd_cmd_handler[] = {
4891 [P_DATA] = { 1, sizeof(struct p_data), receive_Data },
4892 [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply },
4893 [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } ,
4894 [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } ,
4895 [P_BITMAP] = { 1, 0, receive_bitmap } ,
4896 [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } ,
4897 [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote },
4898 [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
4899 [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
4900 [P_SYNC_PARAM] = { 1, 0, receive_SyncParam },
4901 [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam },
4902 [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol },
4903 [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids },
4904 [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes },
4905 [P_STATE] = { 0, sizeof(struct p_state), receive_state },
4906 [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state },
4907 [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid },
4908 [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
4909 [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest },
4910 [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest },
4911 [P_RS_THIN_REQ] = { 0, sizeof(struct p_block_req), receive_DataRequest },
4912 [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip },
4913 [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync },
4914 [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state },
4915 [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol },
4916 [P_TRIM] = { 0, sizeof(struct p_trim), receive_Data },
4917 [P_RS_DEALLOCATED] = { 0, sizeof(struct p_block_desc), receive_rs_deallocated },
4918 [P_WSAME] = { 1, sizeof(struct p_wsame), receive_Data },
4921 static void drbdd(struct drbd_connection *connection)
4923 struct packet_info pi;
4924 size_t shs; /* sub header size */
4927 while (get_t_state(&connection->receiver) == RUNNING) {
4928 struct data_cmd const *cmd;
4930 drbd_thread_current_set_cpu(&connection->receiver);
4931 update_receiver_timing_details(connection, drbd_recv_header_maybe_unplug);
4932 if (drbd_recv_header_maybe_unplug(connection, &pi))
4935 cmd = &drbd_cmd_handler[pi.cmd];
4936 if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) {
4937 drbd_err(connection, "Unexpected data packet %s (0x%04x)",
4938 cmdname(pi.cmd), pi.cmd);
4942 shs = cmd->pkt_size;
4943 if (pi.cmd == P_SIZES && connection->agreed_features & DRBD_FF_WSAME)
4944 shs += sizeof(struct o_qlim);
4945 if (pi.size > shs && !cmd->expect_payload) {
4946 drbd_err(connection, "No payload expected %s l:%d\n",
4947 cmdname(pi.cmd), pi.size);
4950 if (pi.size < shs) {
4951 drbd_err(connection, "%s: unexpected packet size, expected:%d received:%d\n",
4952 cmdname(pi.cmd), (int)shs, pi.size);
4957 update_receiver_timing_details(connection, drbd_recv_all_warn);
4958 err = drbd_recv_all_warn(connection, pi.data, shs);
4964 update_receiver_timing_details(connection, cmd->fn);
4965 err = cmd->fn(connection, &pi);
4967 drbd_err(connection, "error receiving %s, e: %d l: %d!\n",
4968 cmdname(pi.cmd), err, pi.size);
4975 conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD);
4978 static void conn_disconnect(struct drbd_connection *connection)
4980 struct drbd_peer_device *peer_device;
4984 if (connection->cstate == C_STANDALONE)
4987 /* We are about to start the cleanup after connection loss.
4988 * Make sure drbd_make_request knows about that.
4989 * Usually we should be in some network failure state already,
4990 * but just in case we are not, we fix it up here.
4992 conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD);
4994 /* ack_receiver does not clean up anything. it must not interfere, either */
4995 drbd_thread_stop(&connection->ack_receiver);
4996 if (connection->ack_sender) {
4997 destroy_workqueue(connection->ack_sender);
4998 connection->ack_sender = NULL;
5000 drbd_free_sock(connection);
5003 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
5004 struct drbd_device *device = peer_device->device;
5005 kref_get(&device->kref);
5007 drbd_disconnected(peer_device);
5008 kref_put(&device->kref, drbd_destroy_device);
5013 if (!list_empty(&connection->current_epoch->list))
5014 drbd_err(connection, "ASSERTION FAILED: connection->current_epoch->list not empty\n");
5015 /* ok, no more ee's on the fly, it is safe to reset the epoch_size */
5016 atomic_set(&connection->current_epoch->epoch_size, 0);
5017 connection->send.seen_any_write_yet = false;
5019 drbd_info(connection, "Connection closed\n");
5021 if (conn_highest_role(connection) == R_PRIMARY && conn_highest_pdsk(connection) >= D_UNKNOWN)
5022 conn_try_outdate_peer_async(connection);
5024 spin_lock_irq(&connection->resource->req_lock);
5025 oc = connection->cstate;
5026 if (oc >= C_UNCONNECTED)
5027 _conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE);
5029 spin_unlock_irq(&connection->resource->req_lock);
5031 if (oc == C_DISCONNECTING)
5032 conn_request_state(connection, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD);
5035 static int drbd_disconnected(struct drbd_peer_device *peer_device)
5037 struct drbd_device *device = peer_device->device;
5040 /* wait for current activity to cease. */
5041 spin_lock_irq(&device->resource->req_lock);
5042 _drbd_wait_ee_list_empty(device, &device->active_ee);
5043 _drbd_wait_ee_list_empty(device, &device->sync_ee);
5044 _drbd_wait_ee_list_empty(device, &device->read_ee);
5045 spin_unlock_irq(&device->resource->req_lock);
5047 /* We do not have data structures that would allow us to
5048 * get the rs_pending_cnt down to 0 again.
5049 * * On C_SYNC_TARGET we do not have any data structures describing
5050 * the pending RSDataRequest's we have sent.
5051 * * On C_SYNC_SOURCE there is no data structure that tracks
5052 * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget.
5053 * And no, it is not the sum of the reference counts in the
5054 * resync_LRU. The resync_LRU tracks the whole operation including
5055 * the disk-IO, while the rs_pending_cnt only tracks the blocks
5057 drbd_rs_cancel_all(device);
5058 device->rs_total = 0;
5059 device->rs_failed = 0;
5060 atomic_set(&device->rs_pending_cnt, 0);
5061 wake_up(&device->misc_wait);
5063 del_timer_sync(&device->resync_timer);
5064 resync_timer_fn(&device->resync_timer);
5066 /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier,
5067 * w_make_resync_request etc. which may still be on the worker queue
5068 * to be "canceled" */
5069 drbd_flush_workqueue(&peer_device->connection->sender_work);
5071 drbd_finish_peer_reqs(device);
5073 /* This second workqueue flush is necessary, since drbd_finish_peer_reqs()
5074 might have issued a work again. The one before drbd_finish_peer_reqs() is
5075 necessary to reclain net_ee in drbd_finish_peer_reqs(). */
5076 drbd_flush_workqueue(&peer_device->connection->sender_work);
5078 /* need to do it again, drbd_finish_peer_reqs() may have populated it
5079 * again via drbd_try_clear_on_disk_bm(). */
5080 drbd_rs_cancel_all(device);
5082 kfree(device->p_uuid);
5083 device->p_uuid = NULL;
5085 if (!drbd_suspended(device))
5086 tl_clear(peer_device->connection);
5088 drbd_md_sync(device);
5090 if (get_ldev(device)) {
5091 drbd_bitmap_io(device, &drbd_bm_write_copy_pages,
5092 "write from disconnected", BM_LOCKED_CHANGE_ALLOWED);
5096 /* tcp_close and release of sendpage pages can be deferred. I don't
5097 * want to use SO_LINGER, because apparently it can be deferred for
5098 * more than 20 seconds (longest time I checked).
5100 * Actually we don't care for exactly when the network stack does its
5101 * put_page(), but release our reference on these pages right here.
5103 i = drbd_free_peer_reqs(device, &device->net_ee);
5105 drbd_info(device, "net_ee not empty, killed %u entries\n", i);
5106 i = atomic_read(&device->pp_in_use_by_net);
5108 drbd_info(device, "pp_in_use_by_net = %d, expected 0\n", i);
5109 i = atomic_read(&device->pp_in_use);
5111 drbd_info(device, "pp_in_use = %d, expected 0\n", i);
5113 D_ASSERT(device, list_empty(&device->read_ee));
5114 D_ASSERT(device, list_empty(&device->active_ee));
5115 D_ASSERT(device, list_empty(&device->sync_ee));
5116 D_ASSERT(device, list_empty(&device->done_ee));
5122 * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version
5123 * we can agree on is stored in agreed_pro_version.
5125 * feature flags and the reserved array should be enough room for future
5126 * enhancements of the handshake protocol, and possible plugins...
5128 * for now, they are expected to be zero, but ignored.
5130 static int drbd_send_features(struct drbd_connection *connection)
5132 struct drbd_socket *sock;
5133 struct p_connection_features *p;
5135 sock = &connection->data;
5136 p = conn_prepare_command(connection, sock);
5139 memset(p, 0, sizeof(*p));
5140 p->protocol_min = cpu_to_be32(PRO_VERSION_MIN);
5141 p->protocol_max = cpu_to_be32(PRO_VERSION_MAX);
5142 p->feature_flags = cpu_to_be32(PRO_FEATURES);
5143 return conn_send_command(connection, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0);
5148 * 1 yes, we have a valid connection
5149 * 0 oops, did not work out, please try again
5150 * -1 peer talks different language,
5151 * no point in trying again, please go standalone.
5153 static int drbd_do_features(struct drbd_connection *connection)
5155 /* ASSERT current == connection->receiver ... */
5156 struct p_connection_features *p;
5157 const int expect = sizeof(struct p_connection_features);
5158 struct packet_info pi;
5161 err = drbd_send_features(connection);
5165 err = drbd_recv_header(connection, &pi);
5169 if (pi.cmd != P_CONNECTION_FEATURES) {
5170 drbd_err(connection, "expected ConnectionFeatures packet, received: %s (0x%04x)\n",
5171 cmdname(pi.cmd), pi.cmd);
5175 if (pi.size != expect) {
5176 drbd_err(connection, "expected ConnectionFeatures length: %u, received: %u\n",
5182 err = drbd_recv_all_warn(connection, p, expect);
5186 p->protocol_min = be32_to_cpu(p->protocol_min);
5187 p->protocol_max = be32_to_cpu(p->protocol_max);
5188 if (p->protocol_max == 0)
5189 p->protocol_max = p->protocol_min;
5191 if (PRO_VERSION_MAX < p->protocol_min ||
5192 PRO_VERSION_MIN > p->protocol_max)
5195 connection->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max);
5196 connection->agreed_features = PRO_FEATURES & be32_to_cpu(p->feature_flags);
5198 drbd_info(connection, "Handshake successful: "
5199 "Agreed network protocol version %d\n", connection->agreed_pro_version);
5201 drbd_info(connection, "Feature flags enabled on protocol level: 0x%x%s%s%s.\n",
5202 connection->agreed_features,
5203 connection->agreed_features & DRBD_FF_TRIM ? " TRIM" : "",
5204 connection->agreed_features & DRBD_FF_THIN_RESYNC ? " THIN_RESYNC" : "",
5205 connection->agreed_features & DRBD_FF_WSAME ? " WRITE_SAME" :
5206 connection->agreed_features ? "" : " none");
5211 drbd_err(connection, "incompatible DRBD dialects: "
5212 "I support %d-%d, peer supports %d-%d\n",
5213 PRO_VERSION_MIN, PRO_VERSION_MAX,
5214 p->protocol_min, p->protocol_max);
5218 #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE)
5219 static int drbd_do_auth(struct drbd_connection *connection)
5221 drbd_err(connection, "This kernel was build without CONFIG_CRYPTO_HMAC.\n");
5222 drbd_err(connection, "You need to disable 'cram-hmac-alg' in drbd.conf.\n");
5226 #define CHALLENGE_LEN 64
5230 0 - failed, try again (network error),
5231 -1 - auth failed, don't try again.
5234 static int drbd_do_auth(struct drbd_connection *connection)
5236 struct drbd_socket *sock;
5237 char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */
5238 char *response = NULL;
5239 char *right_response = NULL;
5240 char *peers_ch = NULL;
5241 unsigned int key_len;
5242 char secret[SHARED_SECRET_MAX]; /* 64 byte */
5243 unsigned int resp_size;
5244 SHASH_DESC_ON_STACK(desc, connection->cram_hmac_tfm);
5245 struct packet_info pi;
5246 struct net_conf *nc;
5249 /* FIXME: Put the challenge/response into the preallocated socket buffer. */
5252 nc = rcu_dereference(connection->net_conf);
5253 key_len = strlen(nc->shared_secret);
5254 memcpy(secret, nc->shared_secret, key_len);
5257 desc->tfm = connection->cram_hmac_tfm;
5260 rv = crypto_shash_setkey(connection->cram_hmac_tfm, (u8 *)secret, key_len);
5262 drbd_err(connection, "crypto_shash_setkey() failed with %d\n", rv);
5267 get_random_bytes(my_challenge, CHALLENGE_LEN);
5269 sock = &connection->data;
5270 if (!conn_prepare_command(connection, sock)) {
5274 rv = !conn_send_command(connection, sock, P_AUTH_CHALLENGE, 0,
5275 my_challenge, CHALLENGE_LEN);
5279 err = drbd_recv_header(connection, &pi);
5285 if (pi.cmd != P_AUTH_CHALLENGE) {
5286 drbd_err(connection, "expected AuthChallenge packet, received: %s (0x%04x)\n",
5287 cmdname(pi.cmd), pi.cmd);
5292 if (pi.size > CHALLENGE_LEN * 2) {
5293 drbd_err(connection, "expected AuthChallenge payload too big.\n");
5298 if (pi.size < CHALLENGE_LEN) {
5299 drbd_err(connection, "AuthChallenge payload too small.\n");
5304 peers_ch = kmalloc(pi.size, GFP_NOIO);
5305 if (peers_ch == NULL) {
5306 drbd_err(connection, "kmalloc of peers_ch failed\n");
5311 err = drbd_recv_all_warn(connection, peers_ch, pi.size);
5317 if (!memcmp(my_challenge, peers_ch, CHALLENGE_LEN)) {
5318 drbd_err(connection, "Peer presented the same challenge!\n");
5323 resp_size = crypto_shash_digestsize(connection->cram_hmac_tfm);
5324 response = kmalloc(resp_size, GFP_NOIO);
5325 if (response == NULL) {
5326 drbd_err(connection, "kmalloc of response failed\n");
5331 rv = crypto_shash_digest(desc, peers_ch, pi.size, response);
5333 drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv);
5338 if (!conn_prepare_command(connection, sock)) {
5342 rv = !conn_send_command(connection, sock, P_AUTH_RESPONSE, 0,
5343 response, resp_size);
5347 err = drbd_recv_header(connection, &pi);
5353 if (pi.cmd != P_AUTH_RESPONSE) {
5354 drbd_err(connection, "expected AuthResponse packet, received: %s (0x%04x)\n",
5355 cmdname(pi.cmd), pi.cmd);
5360 if (pi.size != resp_size) {
5361 drbd_err(connection, "expected AuthResponse payload of wrong size\n");
5366 err = drbd_recv_all_warn(connection, response , resp_size);
5372 right_response = kmalloc(resp_size, GFP_NOIO);
5373 if (right_response == NULL) {
5374 drbd_err(connection, "kmalloc of right_response failed\n");
5379 rv = crypto_shash_digest(desc, my_challenge, CHALLENGE_LEN,
5382 drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv);
5387 rv = !memcmp(response, right_response, resp_size);
5390 drbd_info(connection, "Peer authenticated using %d bytes HMAC\n",
5398 kfree(right_response);
5399 shash_desc_zero(desc);
5405 int drbd_receiver(struct drbd_thread *thi)
5407 struct drbd_connection *connection = thi->connection;
5410 drbd_info(connection, "receiver (re)started\n");
5413 h = conn_connect(connection);
5415 conn_disconnect(connection);
5416 schedule_timeout_interruptible(HZ);
5419 drbd_warn(connection, "Discarding network configuration.\n");
5420 conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD);
5425 blk_start_plug(&connection->receiver_plug);
5427 blk_finish_plug(&connection->receiver_plug);
5430 conn_disconnect(connection);
5432 drbd_info(connection, "receiver terminated\n");
5436 /* ********* acknowledge sender ******** */
5438 static int got_conn_RqSReply(struct drbd_connection *connection, struct packet_info *pi)
5440 struct p_req_state_reply *p = pi->data;
5441 int retcode = be32_to_cpu(p->retcode);
5443 if (retcode >= SS_SUCCESS) {
5444 set_bit(CONN_WD_ST_CHG_OKAY, &connection->flags);
5446 set_bit(CONN_WD_ST_CHG_FAIL, &connection->flags);
5447 drbd_err(connection, "Requested state change failed by peer: %s (%d)\n",
5448 drbd_set_st_err_str(retcode), retcode);
5450 wake_up(&connection->ping_wait);
5455 static int got_RqSReply(struct drbd_connection *connection, struct packet_info *pi)
5457 struct drbd_peer_device *peer_device;
5458 struct drbd_device *device;
5459 struct p_req_state_reply *p = pi->data;
5460 int retcode = be32_to_cpu(p->retcode);
5462 peer_device = conn_peer_device(connection, pi->vnr);
5465 device = peer_device->device;
5467 if (test_bit(CONN_WD_ST_CHG_REQ, &connection->flags)) {
5468 D_ASSERT(device, connection->agreed_pro_version < 100);
5469 return got_conn_RqSReply(connection, pi);
5472 if (retcode >= SS_SUCCESS) {
5473 set_bit(CL_ST_CHG_SUCCESS, &device->flags);
5475 set_bit(CL_ST_CHG_FAIL, &device->flags);
5476 drbd_err(device, "Requested state change failed by peer: %s (%d)\n",
5477 drbd_set_st_err_str(retcode), retcode);
5479 wake_up(&device->state_wait);
5484 static int got_Ping(struct drbd_connection *connection, struct packet_info *pi)
5486 return drbd_send_ping_ack(connection);
5490 static int got_PingAck(struct drbd_connection *connection, struct packet_info *pi)
5492 /* restore idle timeout */
5493 connection->meta.socket->sk->sk_rcvtimeo = connection->net_conf->ping_int*HZ;
5494 if (!test_and_set_bit(GOT_PING_ACK, &connection->flags))
5495 wake_up(&connection->ping_wait);
5500 static int got_IsInSync(struct drbd_connection *connection, struct packet_info *pi)
5502 struct drbd_peer_device *peer_device;
5503 struct drbd_device *device;
5504 struct p_block_ack *p = pi->data;
5505 sector_t sector = be64_to_cpu(p->sector);
5506 int blksize = be32_to_cpu(p->blksize);
5508 peer_device = conn_peer_device(connection, pi->vnr);
5511 device = peer_device->device;
5513 D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89);
5515 update_peer_seq(peer_device, be32_to_cpu(p->seq_num));
5517 if (get_ldev(device)) {
5518 drbd_rs_complete_io(device, sector);
5519 drbd_set_in_sync(device, sector, blksize);
5520 /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */
5521 device->rs_same_csum += (blksize >> BM_BLOCK_SHIFT);
5524 dec_rs_pending(device);
5525 atomic_add(blksize >> 9, &device->rs_sect_in);
5531 validate_req_change_req_state(struct drbd_device *device, u64 id, sector_t sector,
5532 struct rb_root *root, const char *func,
5533 enum drbd_req_event what, bool missing_ok)
5535 struct drbd_request *req;
5536 struct bio_and_error m;
5538 spin_lock_irq(&device->resource->req_lock);
5539 req = find_request(device, root, id, sector, missing_ok, func);
5540 if (unlikely(!req)) {
5541 spin_unlock_irq(&device->resource->req_lock);
5544 __req_mod(req, what, &m);
5545 spin_unlock_irq(&device->resource->req_lock);
5548 complete_master_bio(device, &m);
5552 static int got_BlockAck(struct drbd_connection *connection, struct packet_info *pi)
5554 struct drbd_peer_device *peer_device;
5555 struct drbd_device *device;
5556 struct p_block_ack *p = pi->data;
5557 sector_t sector = be64_to_cpu(p->sector);
5558 int blksize = be32_to_cpu(p->blksize);
5559 enum drbd_req_event what;
5561 peer_device = conn_peer_device(connection, pi->vnr);
5564 device = peer_device->device;
5566 update_peer_seq(peer_device, be32_to_cpu(p->seq_num));
5568 if (p->block_id == ID_SYNCER) {
5569 drbd_set_in_sync(device, sector, blksize);
5570 dec_rs_pending(device);
5574 case P_RS_WRITE_ACK:
5575 what = WRITE_ACKED_BY_PEER_AND_SIS;
5578 what = WRITE_ACKED_BY_PEER;
5581 what = RECV_ACKED_BY_PEER;
5584 what = CONFLICT_RESOLVED;
5587 what = POSTPONE_WRITE;
5593 return validate_req_change_req_state(device, p->block_id, sector,
5594 &device->write_requests, __func__,
5598 static int got_NegAck(struct drbd_connection *connection, struct packet_info *pi)
5600 struct drbd_peer_device *peer_device;
5601 struct drbd_device *device;
5602 struct p_block_ack *p = pi->data;
5603 sector_t sector = be64_to_cpu(p->sector);
5604 int size = be32_to_cpu(p->blksize);
5607 peer_device = conn_peer_device(connection, pi->vnr);
5610 device = peer_device->device;
5612 update_peer_seq(peer_device, be32_to_cpu(p->seq_num));
5614 if (p->block_id == ID_SYNCER) {
5615 dec_rs_pending(device);
5616 drbd_rs_failed_io(device, sector, size);
5620 err = validate_req_change_req_state(device, p->block_id, sector,
5621 &device->write_requests, __func__,
5624 /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs.
5625 The master bio might already be completed, therefore the
5626 request is no longer in the collision hash. */
5627 /* In Protocol B we might already have got a P_RECV_ACK
5628 but then get a P_NEG_ACK afterwards. */
5629 drbd_set_out_of_sync(device, sector, size);
5634 static int got_NegDReply(struct drbd_connection *connection, struct packet_info *pi)
5636 struct drbd_peer_device *peer_device;
5637 struct drbd_device *device;
5638 struct p_block_ack *p = pi->data;
5639 sector_t sector = be64_to_cpu(p->sector);
5641 peer_device = conn_peer_device(connection, pi->vnr);
5644 device = peer_device->device;
5646 update_peer_seq(peer_device, be32_to_cpu(p->seq_num));
5648 drbd_err(device, "Got NegDReply; Sector %llus, len %u.\n",
5649 (unsigned long long)sector, be32_to_cpu(p->blksize));
5651 return validate_req_change_req_state(device, p->block_id, sector,
5652 &device->read_requests, __func__,
5656 static int got_NegRSDReply(struct drbd_connection *connection, struct packet_info *pi)
5658 struct drbd_peer_device *peer_device;
5659 struct drbd_device *device;
5662 struct p_block_ack *p = pi->data;
5664 peer_device = conn_peer_device(connection, pi->vnr);
5667 device = peer_device->device;
5669 sector = be64_to_cpu(p->sector);
5670 size = be32_to_cpu(p->blksize);
5672 update_peer_seq(peer_device, be32_to_cpu(p->seq_num));
5674 dec_rs_pending(device);
5676 if (get_ldev_if_state(device, D_FAILED)) {
5677 drbd_rs_complete_io(device, sector);
5679 case P_NEG_RS_DREPLY:
5680 drbd_rs_failed_io(device, sector, size);
5692 static int got_BarrierAck(struct drbd_connection *connection, struct packet_info *pi)
5694 struct p_barrier_ack *p = pi->data;
5695 struct drbd_peer_device *peer_device;
5698 tl_release(connection, p->barrier, be32_to_cpu(p->set_size));
5701 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
5702 struct drbd_device *device = peer_device->device;
5704 if (device->state.conn == C_AHEAD &&
5705 atomic_read(&device->ap_in_flight) == 0 &&
5706 !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &device->flags)) {
5707 device->start_resync_timer.expires = jiffies + HZ;
5708 add_timer(&device->start_resync_timer);
5716 static int got_OVResult(struct drbd_connection *connection, struct packet_info *pi)
5718 struct drbd_peer_device *peer_device;
5719 struct drbd_device *device;
5720 struct p_block_ack *p = pi->data;
5721 struct drbd_device_work *dw;
5725 peer_device = conn_peer_device(connection, pi->vnr);
5728 device = peer_device->device;
5730 sector = be64_to_cpu(p->sector);
5731 size = be32_to_cpu(p->blksize);
5733 update_peer_seq(peer_device, be32_to_cpu(p->seq_num));
5735 if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC)
5736 drbd_ov_out_of_sync_found(device, sector, size);
5738 ov_out_of_sync_print(device);
5740 if (!get_ldev(device))
5743 drbd_rs_complete_io(device, sector);
5744 dec_rs_pending(device);
5748 /* let's advance progress step marks only for every other megabyte */
5749 if ((device->ov_left & 0x200) == 0x200)
5750 drbd_advance_rs_marks(device, device->ov_left);
5752 if (device->ov_left == 0) {
5753 dw = kmalloc(sizeof(*dw), GFP_NOIO);
5755 dw->w.cb = w_ov_finished;
5756 dw->device = device;
5757 drbd_queue_work(&peer_device->connection->sender_work, &dw->w);
5759 drbd_err(device, "kmalloc(dw) failed.");
5760 ov_out_of_sync_print(device);
5761 drbd_resync_finished(device);
5768 static int got_skip(struct drbd_connection *connection, struct packet_info *pi)
5773 struct meta_sock_cmd {
5775 int (*fn)(struct drbd_connection *connection, struct packet_info *);
5778 static void set_rcvtimeo(struct drbd_connection *connection, bool ping_timeout)
5781 struct net_conf *nc;
5784 nc = rcu_dereference(connection->net_conf);
5785 t = ping_timeout ? nc->ping_timeo : nc->ping_int;
5792 connection->meta.socket->sk->sk_rcvtimeo = t;
5795 static void set_ping_timeout(struct drbd_connection *connection)
5797 set_rcvtimeo(connection, 1);
5800 static void set_idle_timeout(struct drbd_connection *connection)
5802 set_rcvtimeo(connection, 0);
5805 static struct meta_sock_cmd ack_receiver_tbl[] = {
5806 [P_PING] = { 0, got_Ping },
5807 [P_PING_ACK] = { 0, got_PingAck },
5808 [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
5809 [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
5810 [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
5811 [P_SUPERSEDED] = { sizeof(struct p_block_ack), got_BlockAck },
5812 [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck },
5813 [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply },
5814 [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply },
5815 [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult },
5816 [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck },
5817 [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply },
5818 [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync },
5819 [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip },
5820 [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply },
5821 [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply },
5822 [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck },
5825 int drbd_ack_receiver(struct drbd_thread *thi)
5827 struct drbd_connection *connection = thi->connection;
5828 struct meta_sock_cmd *cmd = NULL;
5829 struct packet_info pi;
5830 unsigned long pre_recv_jif;
5832 void *buf = connection->meta.rbuf;
5834 unsigned int header_size = drbd_header_size(connection);
5835 int expect = header_size;
5836 bool ping_timeout_active = false;
5837 struct sched_param param = { .sched_priority = 2 };
5839 rv = sched_setscheduler(current, SCHED_RR, ¶m);
5841 drbd_err(connection, "drbd_ack_receiver: ERROR set priority, ret=%d\n", rv);
5843 while (get_t_state(thi) == RUNNING) {
5844 drbd_thread_current_set_cpu(thi);
5846 conn_reclaim_net_peer_reqs(connection);
5848 if (test_and_clear_bit(SEND_PING, &connection->flags)) {
5849 if (drbd_send_ping(connection)) {
5850 drbd_err(connection, "drbd_send_ping has failed\n");
5853 set_ping_timeout(connection);
5854 ping_timeout_active = true;
5857 pre_recv_jif = jiffies;
5858 rv = drbd_recv_short(connection->meta.socket, buf, expect-received, 0);
5861 * -EINTR (on meta) we got a signal
5862 * -EAGAIN (on meta) rcvtimeo expired
5863 * -ECONNRESET other side closed the connection
5864 * -ERESTARTSYS (on data) we got a signal
5865 * rv < 0 other than above: unexpected error!
5866 * rv == expected: full header or command
5867 * rv < expected: "woken" by signal during receive
5868 * rv == 0 : "connection shut down by peer"
5870 if (likely(rv > 0)) {
5873 } else if (rv == 0) {
5874 if (test_bit(DISCONNECT_SENT, &connection->flags)) {
5877 t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10;
5880 t = wait_event_timeout(connection->ping_wait,
5881 connection->cstate < C_WF_REPORT_PARAMS,
5886 drbd_err(connection, "meta connection shut down by peer.\n");
5888 } else if (rv == -EAGAIN) {
5889 /* If the data socket received something meanwhile,
5890 * that is good enough: peer is still alive. */
5891 if (time_after(connection->last_received, pre_recv_jif))
5893 if (ping_timeout_active) {
5894 drbd_err(connection, "PingAck did not arrive in time.\n");
5897 set_bit(SEND_PING, &connection->flags);
5899 } else if (rv == -EINTR) {
5900 /* maybe drbd_thread_stop(): the while condition will notice.
5901 * maybe woken for send_ping: we'll send a ping above,
5902 * and change the rcvtimeo */
5903 flush_signals(current);
5906 drbd_err(connection, "sock_recvmsg returned %d\n", rv);
5910 if (received == expect && cmd == NULL) {
5911 if (decode_header(connection, connection->meta.rbuf, &pi))
5913 cmd = &ack_receiver_tbl[pi.cmd];
5914 if (pi.cmd >= ARRAY_SIZE(ack_receiver_tbl) || !cmd->fn) {
5915 drbd_err(connection, "Unexpected meta packet %s (0x%04x)\n",
5916 cmdname(pi.cmd), pi.cmd);
5919 expect = header_size + cmd->pkt_size;
5920 if (pi.size != expect - header_size) {
5921 drbd_err(connection, "Wrong packet size on meta (c: %d, l: %d)\n",
5926 if (received == expect) {
5929 err = cmd->fn(connection, &pi);
5931 drbd_err(connection, "%pf failed\n", cmd->fn);
5935 connection->last_received = jiffies;
5937 if (cmd == &ack_receiver_tbl[P_PING_ACK]) {
5938 set_idle_timeout(connection);
5939 ping_timeout_active = false;
5942 buf = connection->meta.rbuf;
5944 expect = header_size;
5951 conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD);
5952 conn_md_sync(connection);
5956 conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD);
5959 drbd_info(connection, "ack_receiver terminated\n");
5964 void drbd_send_acks_wf(struct work_struct *ws)
5966 struct drbd_peer_device *peer_device =
5967 container_of(ws, struct drbd_peer_device, send_acks_work);
5968 struct drbd_connection *connection = peer_device->connection;
5969 struct drbd_device *device = peer_device->device;
5970 struct net_conf *nc;
5974 nc = rcu_dereference(connection->net_conf);
5975 tcp_cork = nc->tcp_cork;
5979 drbd_tcp_cork(connection->meta.socket);
5981 err = drbd_finish_peer_reqs(device);
5982 kref_put(&device->kref, drbd_destroy_device);
5983 /* get is in drbd_endio_write_sec_final(). That is necessary to keep the
5984 struct work_struct send_acks_work alive, which is in the peer_device object */
5987 conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD);
5992 drbd_tcp_uncork(connection->meta.socket);