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 <asm/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 <linux/smp_lock.h>
40 #include <linux/pkt_sched.h>
41 #define __KERNEL_SYSCALLS__
42 #include <linux/unistd.h>
43 #include <linux/vmalloc.h>
44 #include <linux/random.h>
45 #include <linux/string.h>
46 #include <linux/scatterlist.h>
54 struct drbd_epoch *epoch;
63 static int drbd_do_handshake(struct drbd_conf *mdev);
64 static int drbd_do_auth(struct drbd_conf *mdev);
66 static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event);
67 static int e_end_block(struct drbd_conf *, struct drbd_work *, int);
69 static struct drbd_epoch *previous_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch)
71 struct drbd_epoch *prev;
72 spin_lock(&mdev->epoch_lock);
73 prev = list_entry(epoch->list.prev, struct drbd_epoch, list);
74 if (prev == epoch || prev == mdev->current_epoch)
76 spin_unlock(&mdev->epoch_lock);
80 #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN)
83 * some helper functions to deal with single linked page lists,
84 * page->private being our "next" pointer.
87 /* If at least n pages are linked at head, get n pages off.
88 * Otherwise, don't modify head, and return NULL.
89 * Locking is the responsibility of the caller.
91 static struct page *page_chain_del(struct page **head, int n)
105 tmp = page_chain_next(page);
107 break; /* found sufficient pages */
109 /* insufficient pages, don't use any of them. */
114 /* add end of list marker for the returned list */
115 set_page_private(page, 0);
116 /* actual return value, and adjustment of head */
122 /* may be used outside of locks to find the tail of a (usually short)
123 * "private" page chain, before adding it back to a global chain head
124 * with page_chain_add() under a spinlock. */
125 static struct page *page_chain_tail(struct page *page, int *len)
129 while ((tmp = page_chain_next(page)))
136 static int page_chain_free(struct page *page)
140 page_chain_for_each_safe(page, tmp) {
147 static void page_chain_add(struct page **head,
148 struct page *chain_first, struct page *chain_last)
152 tmp = page_chain_tail(chain_first, NULL);
153 BUG_ON(tmp != chain_last);
156 /* add chain to head */
157 set_page_private(chain_last, (unsigned long)*head);
161 static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number)
163 struct page *page = NULL;
164 struct page *tmp = NULL;
167 /* Yes, testing drbd_pp_vacant outside the lock is racy.
168 * So what. It saves a spin_lock. */
169 if (drbd_pp_vacant >= number) {
170 spin_lock(&drbd_pp_lock);
171 page = page_chain_del(&drbd_pp_pool, number);
173 drbd_pp_vacant -= number;
174 spin_unlock(&drbd_pp_lock);
179 /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD
180 * "criss-cross" setup, that might cause write-out on some other DRBD,
181 * which in turn might block on the other node at this very place. */
182 for (i = 0; i < number; i++) {
183 tmp = alloc_page(GFP_TRY);
186 set_page_private(tmp, (unsigned long)page);
193 /* Not enough pages immediately available this time.
194 * No need to jump around here, drbd_pp_alloc will retry this
195 * function "soon". */
197 tmp = page_chain_tail(page, NULL);
198 spin_lock(&drbd_pp_lock);
199 page_chain_add(&drbd_pp_pool, page, tmp);
201 spin_unlock(&drbd_pp_lock);
206 /* kick lower level device, if we have more than (arbitrary number)
207 * reference counts on it, which typically are locally submitted io
208 * requests. don't use unacked_cnt, so we speed up proto A and B, too. */
209 static void maybe_kick_lo(struct drbd_conf *mdev)
211 if (atomic_read(&mdev->local_cnt) >= mdev->net_conf->unplug_watermark)
215 static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed)
217 struct drbd_epoch_entry *e;
218 struct list_head *le, *tle;
220 /* The EEs are always appended to the end of the list. Since
221 they are sent in order over the wire, they have to finish
222 in order. As soon as we see the first not finished we can
223 stop to examine the list... */
225 list_for_each_safe(le, tle, &mdev->net_ee) {
226 e = list_entry(le, struct drbd_epoch_entry, w.list);
227 if (drbd_ee_has_active_page(e))
229 list_move(le, to_be_freed);
233 static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev)
235 LIST_HEAD(reclaimed);
236 struct drbd_epoch_entry *e, *t;
239 spin_lock_irq(&mdev->req_lock);
240 reclaim_net_ee(mdev, &reclaimed);
241 spin_unlock_irq(&mdev->req_lock);
243 list_for_each_entry_safe(e, t, &reclaimed, w.list)
244 drbd_free_net_ee(mdev, e);
248 * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled)
249 * @mdev: DRBD device.
250 * @number: number of pages requested
251 * @retry: whether to retry, if not enough pages are available right now
253 * Tries to allocate number pages, first from our own page pool, then from
254 * the kernel, unless this allocation would exceed the max_buffers setting.
255 * Possibly retry until DRBD frees sufficient pages somewhere else.
257 * Returns a page chain linked via page->private.
259 static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry)
261 struct page *page = NULL;
264 /* Yes, we may run up to @number over max_buffers. If we
265 * follow it strictly, the admin will get it wrong anyways. */
266 if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers)
267 page = drbd_pp_first_pages_or_try_alloc(mdev, number);
269 while (page == NULL) {
270 prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE);
272 drbd_kick_lo_and_reclaim_net(mdev);
274 if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) {
275 page = drbd_pp_first_pages_or_try_alloc(mdev, number);
283 if (signal_pending(current)) {
284 dev_warn(DEV, "drbd_pp_alloc interrupted!\n");
290 finish_wait(&drbd_pp_wait, &wait);
293 atomic_add(number, &mdev->pp_in_use);
297 /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc.
298 * Is also used from inside an other spin_lock_irq(&mdev->req_lock);
299 * Either links the page chain back to the global pool,
300 * or returns all pages to the system. */
301 static void drbd_pp_free(struct drbd_conf *mdev, struct page *page, int is_net)
303 atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use;
306 if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count)
307 i = page_chain_free(page);
310 tmp = page_chain_tail(page, &i);
311 spin_lock(&drbd_pp_lock);
312 page_chain_add(&drbd_pp_pool, page, tmp);
314 spin_unlock(&drbd_pp_lock);
316 i = atomic_sub_return(i, a);
318 dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n",
319 is_net ? "pp_in_use_by_net" : "pp_in_use", i);
320 wake_up(&drbd_pp_wait);
324 You need to hold the req_lock:
325 _drbd_wait_ee_list_empty()
327 You must not have the req_lock:
333 drbd_process_done_ee()
335 drbd_wait_ee_list_empty()
338 struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev,
341 unsigned int data_size,
342 gfp_t gfp_mask) __must_hold(local)
344 struct drbd_epoch_entry *e;
346 unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT;
348 if (FAULT_ACTIVE(mdev, DRBD_FAULT_AL_EE))
351 e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM);
353 if (!(gfp_mask & __GFP_NOWARN))
354 dev_err(DEV, "alloc_ee: Allocation of an EE failed\n");
358 page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT));
362 INIT_HLIST_NODE(&e->colision);
366 atomic_set(&e->pending_bios, 0);
375 mempool_free(e, drbd_ee_mempool);
379 void drbd_free_some_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, int is_net)
381 if (e->flags & EE_HAS_DIGEST)
383 drbd_pp_free(mdev, e->pages, is_net);
384 D_ASSERT(atomic_read(&e->pending_bios) == 0);
385 D_ASSERT(hlist_unhashed(&e->colision));
386 mempool_free(e, drbd_ee_mempool);
389 int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list)
391 LIST_HEAD(work_list);
392 struct drbd_epoch_entry *e, *t;
394 int is_net = list == &mdev->net_ee;
396 spin_lock_irq(&mdev->req_lock);
397 list_splice_init(list, &work_list);
398 spin_unlock_irq(&mdev->req_lock);
400 list_for_each_entry_safe(e, t, &work_list, w.list) {
401 drbd_free_some_ee(mdev, e, is_net);
409 * This function is called from _asender only_
410 * but see also comments in _req_mod(,barrier_acked)
411 * and receive_Barrier.
413 * Move entries from net_ee to done_ee, if ready.
414 * Grab done_ee, call all callbacks, free the entries.
415 * The callbacks typically send out ACKs.
417 static int drbd_process_done_ee(struct drbd_conf *mdev)
419 LIST_HEAD(work_list);
420 LIST_HEAD(reclaimed);
421 struct drbd_epoch_entry *e, *t;
422 int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS);
424 spin_lock_irq(&mdev->req_lock);
425 reclaim_net_ee(mdev, &reclaimed);
426 list_splice_init(&mdev->done_ee, &work_list);
427 spin_unlock_irq(&mdev->req_lock);
429 list_for_each_entry_safe(e, t, &reclaimed, w.list)
430 drbd_free_net_ee(mdev, e);
432 /* possible callbacks here:
433 * e_end_block, and e_end_resync_block, e_send_discard_ack.
434 * all ignore the last argument.
436 list_for_each_entry_safe(e, t, &work_list, w.list) {
437 /* list_del not necessary, next/prev members not touched */
438 ok = e->w.cb(mdev, &e->w, !ok) && ok;
439 drbd_free_ee(mdev, e);
441 wake_up(&mdev->ee_wait);
446 void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head)
450 /* avoids spin_lock/unlock
451 * and calling prepare_to_wait in the fast path */
452 while (!list_empty(head)) {
453 prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE);
454 spin_unlock_irq(&mdev->req_lock);
457 finish_wait(&mdev->ee_wait, &wait);
458 spin_lock_irq(&mdev->req_lock);
462 void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head)
464 spin_lock_irq(&mdev->req_lock);
465 _drbd_wait_ee_list_empty(mdev, head);
466 spin_unlock_irq(&mdev->req_lock);
469 /* see also kernel_accept; which is only present since 2.6.18.
470 * also we want to log which part of it failed, exactly */
471 static int drbd_accept(struct drbd_conf *mdev, const char **what,
472 struct socket *sock, struct socket **newsock)
474 struct sock *sk = sock->sk;
478 err = sock->ops->listen(sock, 5);
482 *what = "sock_create_lite";
483 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
489 err = sock->ops->accept(sock, *newsock, 0);
491 sock_release(*newsock);
495 (*newsock)->ops = sock->ops;
501 static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock,
502 void *buf, size_t size, int flags)
509 struct msghdr msg = {
511 .msg_iov = (struct iovec *)&iov,
512 .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL)
518 rv = sock_recvmsg(sock, &msg, size, msg.msg_flags);
524 static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size)
531 struct msghdr msg = {
533 .msg_iov = (struct iovec *)&iov,
534 .msg_flags = MSG_WAITALL | MSG_NOSIGNAL
542 rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags);
547 * ECONNRESET other side closed the connection
548 * ERESTARTSYS (on sock) we got a signal
552 if (rv == -ECONNRESET)
553 dev_info(DEV, "sock was reset by peer\n");
554 else if (rv != -ERESTARTSYS)
555 dev_err(DEV, "sock_recvmsg returned %d\n", rv);
557 } else if (rv == 0) {
558 dev_info(DEV, "sock was shut down by peer\n");
561 /* signal came in, or peer/link went down,
562 * after we read a partial message
564 /* D_ASSERT(signal_pending(current)); */
572 drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
578 * On individual connections, the socket buffer size must be set prior to the
579 * listen(2) or connect(2) calls in order to have it take effect.
580 * This is our wrapper to do so.
582 static void drbd_setbufsize(struct socket *sock, unsigned int snd,
585 /* open coded SO_SNDBUF, SO_RCVBUF */
587 sock->sk->sk_sndbuf = snd;
588 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
591 sock->sk->sk_rcvbuf = rcv;
592 sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
596 static struct socket *drbd_try_connect(struct drbd_conf *mdev)
600 struct sockaddr_in6 src_in6;
602 int disconnect_on_error = 1;
604 if (!get_net_conf(mdev))
607 what = "sock_create_kern";
608 err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family,
609 SOCK_STREAM, IPPROTO_TCP, &sock);
615 sock->sk->sk_rcvtimeo =
616 sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ;
617 drbd_setbufsize(sock, mdev->net_conf->sndbuf_size,
618 mdev->net_conf->rcvbuf_size);
620 /* explicitly bind to the configured IP as source IP
621 * for the outgoing connections.
622 * This is needed for multihomed hosts and to be
623 * able to use lo: interfaces for drbd.
624 * Make sure to use 0 as port number, so linux selects
625 * a free one dynamically.
627 memcpy(&src_in6, mdev->net_conf->my_addr,
628 min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6)));
629 if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6)
630 src_in6.sin6_port = 0;
632 ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */
634 what = "bind before connect";
635 err = sock->ops->bind(sock,
636 (struct sockaddr *) &src_in6,
637 mdev->net_conf->my_addr_len);
641 /* connect may fail, peer not yet available.
642 * stay C_WF_CONNECTION, don't go Disconnecting! */
643 disconnect_on_error = 0;
645 err = sock->ops->connect(sock,
646 (struct sockaddr *)mdev->net_conf->peer_addr,
647 mdev->net_conf->peer_addr_len, 0);
656 /* timeout, busy, signal pending */
657 case ETIMEDOUT: case EAGAIN: case EINPROGRESS:
658 case EINTR: case ERESTARTSYS:
659 /* peer not (yet) available, network problem */
660 case ECONNREFUSED: case ENETUNREACH:
661 case EHOSTDOWN: case EHOSTUNREACH:
662 disconnect_on_error = 0;
665 dev_err(DEV, "%s failed, err = %d\n", what, err);
667 if (disconnect_on_error)
668 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
674 static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev)
677 struct socket *s_estab = NULL, *s_listen;
680 if (!get_net_conf(mdev))
683 what = "sock_create_kern";
684 err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family,
685 SOCK_STREAM, IPPROTO_TCP, &s_listen);
691 timeo = mdev->net_conf->try_connect_int * HZ;
692 timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */
694 s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */
695 s_listen->sk->sk_rcvtimeo = timeo;
696 s_listen->sk->sk_sndtimeo = timeo;
697 drbd_setbufsize(s_listen, mdev->net_conf->sndbuf_size,
698 mdev->net_conf->rcvbuf_size);
700 what = "bind before listen";
701 err = s_listen->ops->bind(s_listen,
702 (struct sockaddr *) mdev->net_conf->my_addr,
703 mdev->net_conf->my_addr_len);
707 err = drbd_accept(mdev, &what, s_listen, &s_estab);
711 sock_release(s_listen);
713 if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) {
714 dev_err(DEV, "%s failed, err = %d\n", what, err);
715 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
723 static int drbd_send_fp(struct drbd_conf *mdev,
724 struct socket *sock, enum drbd_packets cmd)
726 struct p_header80 *h = &mdev->data.sbuf.header.h80;
728 return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0);
731 static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock)
733 struct p_header80 *h = &mdev->data.rbuf.header.h80;
736 rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0);
738 if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC)
739 return be16_to_cpu(h->command);
745 * drbd_socket_okay() - Free the socket if its connection is not okay
746 * @mdev: DRBD device.
747 * @sock: pointer to the pointer to the socket.
749 static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock)
757 rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK);
759 if (rr > 0 || rr == -EAGAIN) {
770 * 1 yes, we have a valid connection
771 * 0 oops, did not work out, please try again
772 * -1 peer talks different language,
773 * no point in trying again, please go standalone.
774 * -2 We do not have a network config...
776 static int drbd_connect(struct drbd_conf *mdev)
778 struct socket *s, *sock, *msock;
781 D_ASSERT(!mdev->data.socket);
783 if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS)
786 clear_bit(DISCARD_CONCURRENT, &mdev->flags);
793 /* 3 tries, this should take less than a second! */
794 s = drbd_try_connect(mdev);
797 /* give the other side time to call bind() & listen() */
798 __set_current_state(TASK_INTERRUPTIBLE);
799 schedule_timeout(HZ / 10);
804 drbd_send_fp(mdev, s, P_HAND_SHAKE_S);
808 drbd_send_fp(mdev, s, P_HAND_SHAKE_M);
812 dev_err(DEV, "Logic error in drbd_connect()\n");
813 goto out_release_sockets;
818 __set_current_state(TASK_INTERRUPTIBLE);
819 schedule_timeout(HZ / 10);
820 ok = drbd_socket_okay(mdev, &sock);
821 ok = drbd_socket_okay(mdev, &msock) && ok;
827 s = drbd_wait_for_connect(mdev);
829 try = drbd_recv_fp(mdev, s);
830 drbd_socket_okay(mdev, &sock);
831 drbd_socket_okay(mdev, &msock);
835 dev_warn(DEV, "initial packet S crossed\n");
842 dev_warn(DEV, "initial packet M crossed\n");
846 set_bit(DISCARD_CONCURRENT, &mdev->flags);
849 dev_warn(DEV, "Error receiving initial packet\n");
856 if (mdev->state.conn <= C_DISCONNECTING)
857 goto out_release_sockets;
858 if (signal_pending(current)) {
859 flush_signals(current);
861 if (get_t_state(&mdev->receiver) == Exiting)
862 goto out_release_sockets;
866 ok = drbd_socket_okay(mdev, &sock);
867 ok = drbd_socket_okay(mdev, &msock) && ok;
873 msock->sk->sk_reuse = 1; /* SO_REUSEADDR */
874 sock->sk->sk_reuse = 1; /* SO_REUSEADDR */
876 sock->sk->sk_allocation = GFP_NOIO;
877 msock->sk->sk_allocation = GFP_NOIO;
879 sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK;
880 msock->sk->sk_priority = TC_PRIO_INTERACTIVE;
883 * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
884 * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
885 * first set it to the P_HAND_SHAKE timeout,
886 * which we set to 4x the configured ping_timeout. */
887 sock->sk->sk_sndtimeo =
888 sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10;
890 msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
891 msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ;
893 /* we don't want delays.
894 * we use TCP_CORK where apropriate, though */
895 drbd_tcp_nodelay(sock);
896 drbd_tcp_nodelay(msock);
898 mdev->data.socket = sock;
899 mdev->meta.socket = msock;
900 mdev->last_received = jiffies;
902 D_ASSERT(mdev->asender.task == NULL);
904 h = drbd_do_handshake(mdev);
908 if (mdev->cram_hmac_tfm) {
909 /* drbd_request_state(mdev, NS(conn, WFAuth)); */
910 switch (drbd_do_auth(mdev)) {
912 dev_err(DEV, "Authentication of peer failed\n");
915 dev_err(DEV, "Authentication of peer failed, trying again.\n");
920 if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS)
923 sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
924 sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
926 atomic_set(&mdev->packet_seq, 0);
929 drbd_thread_start(&mdev->asender);
931 if (mdev->agreed_pro_version < 95 && get_ldev(mdev)) {
932 drbd_setup_queue_param(mdev, DRBD_MAX_SIZE_H80_PACKET);
936 if (!drbd_send_protocol(mdev))
938 drbd_send_sync_param(mdev, &mdev->sync_conf);
939 drbd_send_sizes(mdev, 0, 0);
940 drbd_send_uuids(mdev);
941 drbd_send_state(mdev);
942 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
943 clear_bit(RESIZE_PENDING, &mdev->flags);
955 static int drbd_recv_header(struct drbd_conf *mdev, enum drbd_packets *cmd, unsigned int *packet_size)
957 union p_header *h = &mdev->data.rbuf.header;
960 r = drbd_recv(mdev, h, sizeof(*h));
961 if (unlikely(r != sizeof(*h))) {
962 dev_err(DEV, "short read expecting header on sock: r=%d\n", r);
966 if (likely(h->h80.magic == BE_DRBD_MAGIC)) {
967 *cmd = be16_to_cpu(h->h80.command);
968 *packet_size = be16_to_cpu(h->h80.length);
969 } else if (h->h95.magic == BE_DRBD_MAGIC_BIG) {
970 *cmd = be16_to_cpu(h->h95.command);
971 *packet_size = be32_to_cpu(h->h95.length);
973 dev_err(DEV, "magic?? on data m: 0x%08x c: %d l: %d\n",
974 be32_to_cpu(h->h80.magic),
975 be16_to_cpu(h->h80.command),
976 be16_to_cpu(h->h80.length));
979 mdev->last_received = jiffies;
984 static enum finish_epoch drbd_flush_after_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch)
988 if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) {
989 rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL,
990 NULL, BLKDEV_IFL_WAIT);
992 dev_err(DEV, "local disk flush failed with status %d\n", rv);
993 /* would rather check on EOPNOTSUPP, but that is not reliable.
994 * don't try again for ANY return value != 0
995 * if (rv == -EOPNOTSUPP) */
996 drbd_bump_write_ordering(mdev, WO_drain_io);
1001 return drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE);
1004 static int w_flush(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
1006 struct flush_work *fw = (struct flush_work *)w;
1007 struct drbd_epoch *epoch = fw->epoch;
1011 if (!test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags))
1012 drbd_flush_after_epoch(mdev, epoch);
1014 drbd_may_finish_epoch(mdev, epoch, EV_PUT |
1015 (mdev->state.conn < C_CONNECTED ? EV_CLEANUP : 0));
1021 * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it.
1022 * @mdev: DRBD device.
1023 * @epoch: Epoch object.
1026 static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
1027 struct drbd_epoch *epoch,
1028 enum epoch_event ev)
1030 int finish, epoch_size;
1031 struct drbd_epoch *next_epoch;
1032 int schedule_flush = 0;
1033 enum finish_epoch rv = FE_STILL_LIVE;
1035 spin_lock(&mdev->epoch_lock);
1040 epoch_size = atomic_read(&epoch->epoch_size);
1042 switch (ev & ~EV_CLEANUP) {
1044 atomic_dec(&epoch->active);
1046 case EV_GOT_BARRIER_NR:
1047 set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags);
1049 /* Special case: If we just switched from WO_bio_barrier to
1050 WO_bdev_flush we should not finish the current epoch */
1051 if (test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags) && epoch_size == 1 &&
1052 mdev->write_ordering != WO_bio_barrier &&
1053 epoch == mdev->current_epoch)
1054 clear_bit(DE_CONTAINS_A_BARRIER, &epoch->flags);
1056 case EV_BARRIER_DONE:
1057 set_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags);
1059 case EV_BECAME_LAST:
1064 if (epoch_size != 0 &&
1065 atomic_read(&epoch->active) == 0 &&
1066 test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) &&
1067 epoch->list.prev == &mdev->current_epoch->list &&
1068 !test_bit(DE_IS_FINISHING, &epoch->flags)) {
1069 /* Nearly all conditions are met to finish that epoch... */
1070 if (test_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags) ||
1071 mdev->write_ordering == WO_none ||
1072 (epoch_size == 1 && test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) ||
1075 set_bit(DE_IS_FINISHING, &epoch->flags);
1076 } else if (!test_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags) &&
1077 mdev->write_ordering == WO_bio_barrier) {
1078 atomic_inc(&epoch->active);
1083 if (!(ev & EV_CLEANUP)) {
1084 spin_unlock(&mdev->epoch_lock);
1085 drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size);
1086 spin_lock(&mdev->epoch_lock);
1090 if (mdev->current_epoch != epoch) {
1091 next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list);
1092 list_del(&epoch->list);
1093 ev = EV_BECAME_LAST | (ev & EV_CLEANUP);
1097 if (rv == FE_STILL_LIVE)
1101 atomic_set(&epoch->epoch_size, 0);
1102 /* atomic_set(&epoch->active, 0); is already zero */
1103 if (rv == FE_STILL_LIVE)
1114 spin_unlock(&mdev->epoch_lock);
1116 if (schedule_flush) {
1117 struct flush_work *fw;
1118 fw = kmalloc(sizeof(*fw), GFP_ATOMIC);
1122 drbd_queue_work(&mdev->data.work, &fw->w);
1124 dev_warn(DEV, "Could not kmalloc a flush_work obj\n");
1125 set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags);
1126 /* That is not a recursion, only one level */
1127 drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE);
1128 drbd_may_finish_epoch(mdev, epoch, EV_PUT);
1136 * drbd_bump_write_ordering() - Fall back to an other write ordering method
1137 * @mdev: DRBD device.
1138 * @wo: Write ordering method to try.
1140 void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local)
1142 enum write_ordering_e pwo;
1143 static char *write_ordering_str[] = {
1145 [WO_drain_io] = "drain",
1146 [WO_bdev_flush] = "flush",
1147 [WO_bio_barrier] = "barrier",
1150 pwo = mdev->write_ordering;
1152 if (wo == WO_bio_barrier && mdev->ldev->dc.no_disk_barrier)
1154 if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush)
1156 if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain)
1158 mdev->write_ordering = wo;
1159 if (pwo != mdev->write_ordering || wo == WO_bio_barrier)
1160 dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]);
1165 * @mdev: DRBD device.
1167 * @rw: flag field, see bio->bi_rw
1169 /* TODO allocate from our own bio_set. */
1170 int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e,
1171 const unsigned rw, const int fault_type)
1173 struct bio *bios = NULL;
1175 struct page *page = e->pages;
1176 sector_t sector = e->sector;
1177 unsigned ds = e->size;
1178 unsigned n_bios = 0;
1179 unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT;
1181 /* In most cases, we will only need one bio. But in case the lower
1182 * level restrictions happen to be different at this offset on this
1183 * side than those of the sending peer, we may need to submit the
1184 * request in more than one bio. */
1186 bio = bio_alloc(GFP_NOIO, nr_pages);
1188 dev_err(DEV, "submit_ee: Allocation of a bio failed\n");
1191 /* > e->sector, unless this is the first bio */
1192 bio->bi_sector = sector;
1193 bio->bi_bdev = mdev->ldev->backing_bdev;
1194 /* we special case some flags in the multi-bio case, see below
1195 * (REQ_UNPLUG, REQ_HARDBARRIER) */
1197 bio->bi_private = e;
1198 bio->bi_end_io = drbd_endio_sec;
1200 bio->bi_next = bios;
1204 page_chain_for_each(page) {
1205 unsigned len = min_t(unsigned, ds, PAGE_SIZE);
1206 if (!bio_add_page(bio, page, len, 0)) {
1207 /* a single page must always be possible! */
1208 BUG_ON(bio->bi_vcnt == 0);
1215 D_ASSERT(page == NULL);
1218 atomic_set(&e->pending_bios, n_bios);
1221 bios = bios->bi_next;
1222 bio->bi_next = NULL;
1224 /* strip off REQ_UNPLUG unless it is the last bio */
1226 bio->bi_rw &= ~REQ_UNPLUG;
1228 drbd_generic_make_request(mdev, fault_type, bio);
1230 /* strip off REQ_HARDBARRIER,
1231 * unless it is the first or last bio */
1232 if (bios && bios->bi_next)
1233 bios->bi_rw &= ~REQ_HARDBARRIER;
1235 maybe_kick_lo(mdev);
1241 bios = bios->bi_next;
1248 * w_e_reissue() - Worker callback; Resubmit a bio, without REQ_HARDBARRIER set
1249 * @mdev: DRBD device.
1251 * @cancel: The connection will be closed anyways (unused in this callback)
1253 int w_e_reissue(struct drbd_conf *mdev, struct drbd_work *w, int cancel) __releases(local)
1255 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1256 /* We leave DE_CONTAINS_A_BARRIER and EE_IS_BARRIER in place,
1257 (and DE_BARRIER_IN_NEXT_EPOCH_ISSUED in the previous Epoch)
1258 so that we can finish that epoch in drbd_may_finish_epoch().
1259 That is necessary if we already have a long chain of Epochs, before
1260 we realize that REQ_HARDBARRIER is actually not supported */
1262 /* As long as the -ENOTSUPP on the barrier is reported immediately
1263 that will never trigger. If it is reported late, we will just
1264 print that warning and continue correctly for all future requests
1265 with WO_bdev_flush */
1266 if (previous_epoch(mdev, e->epoch))
1267 dev_warn(DEV, "Write ordering was not enforced (one time event)\n");
1269 /* we still have a local reference,
1270 * get_ldev was done in receive_Data. */
1272 e->w.cb = e_end_block;
1273 if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_DT_WR) != 0) {
1274 /* drbd_submit_ee fails for one reason only:
1275 * if was not able to allocate sufficient bios.
1276 * requeue, try again later. */
1277 e->w.cb = w_e_reissue;
1278 drbd_queue_work(&mdev->data.work, &e->w);
1283 static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
1285 int rv, issue_flush;
1286 struct p_barrier *p = &mdev->data.rbuf.barrier;
1287 struct drbd_epoch *epoch;
1291 if (mdev->net_conf->wire_protocol != DRBD_PROT_C)
1294 mdev->current_epoch->barrier_nr = p->barrier;
1295 rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR);
1297 /* P_BARRIER_ACK may imply that the corresponding extent is dropped from
1298 * the activity log, which means it would not be resynced in case the
1299 * R_PRIMARY crashes now.
1300 * Therefore we must send the barrier_ack after the barrier request was
1302 switch (mdev->write_ordering) {
1303 case WO_bio_barrier:
1305 if (rv == FE_RECYCLED)
1311 if (rv == FE_STILL_LIVE) {
1312 set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags);
1313 drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
1314 rv = drbd_flush_after_epoch(mdev, mdev->current_epoch);
1316 if (rv == FE_RECYCLED)
1319 /* The asender will send all the ACKs and barrier ACKs out, since
1320 all EEs moved from the active_ee to the done_ee. We need to
1321 provide a new epoch object for the EEs that come in soon */
1325 /* receiver context, in the writeout path of the other node.
1326 * avoid potential distributed deadlock */
1327 epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
1329 dev_warn(DEV, "Allocation of an epoch failed, slowing down\n");
1330 issue_flush = !test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags);
1331 drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
1333 rv = drbd_flush_after_epoch(mdev, mdev->current_epoch);
1334 if (rv == FE_RECYCLED)
1338 drbd_wait_ee_list_empty(mdev, &mdev->done_ee);
1344 atomic_set(&epoch->epoch_size, 0);
1345 atomic_set(&epoch->active, 0);
1347 spin_lock(&mdev->epoch_lock);
1348 if (atomic_read(&mdev->current_epoch->epoch_size)) {
1349 list_add(&epoch->list, &mdev->current_epoch->list);
1350 mdev->current_epoch = epoch;
1353 /* The current_epoch got recycled while we allocated this one... */
1356 spin_unlock(&mdev->epoch_lock);
1361 /* used from receive_RSDataReply (recv_resync_read)
1362 * and from receive_Data */
1363 static struct drbd_epoch_entry *
1364 read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local)
1366 const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
1367 struct drbd_epoch_entry *e;
1370 void *dig_in = mdev->int_dig_in;
1371 void *dig_vv = mdev->int_dig_vv;
1372 unsigned long *data;
1374 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
1375 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
1378 rr = drbd_recv(mdev, dig_in, dgs);
1380 dev_warn(DEV, "short read receiving data digest: read %d expected %d\n",
1388 ERR_IF(data_size & 0x1ff) return NULL;
1389 ERR_IF(data_size > DRBD_MAX_SEGMENT_SIZE) return NULL;
1391 /* even though we trust out peer,
1392 * we sometimes have to double check. */
1393 if (sector + (data_size>>9) > capacity) {
1394 dev_err(DEV, "capacity: %llus < sector: %llus + size: %u\n",
1395 (unsigned long long)capacity,
1396 (unsigned long long)sector, data_size);
1400 /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
1401 * "criss-cross" setup, that might cause write-out on some other DRBD,
1402 * which in turn might block on the other node at this very place. */
1403 e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO);
1409 page_chain_for_each(page) {
1410 unsigned len = min_t(int, ds, PAGE_SIZE);
1412 rr = drbd_recv(mdev, data, len);
1413 if (FAULT_ACTIVE(mdev, DRBD_FAULT_RECEIVE)) {
1414 dev_err(DEV, "Fault injection: Corrupting data on receive\n");
1415 data[0] = data[0] ^ (unsigned long)-1;
1419 drbd_free_ee(mdev, e);
1420 dev_warn(DEV, "short read receiving data: read %d expected %d\n",
1428 drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv);
1429 if (memcmp(dig_in, dig_vv, dgs)) {
1430 dev_err(DEV, "Digest integrity check FAILED.\n");
1431 drbd_bcast_ee(mdev, "digest failed",
1432 dgs, dig_in, dig_vv, e);
1433 drbd_free_ee(mdev, e);
1437 mdev->recv_cnt += data_size>>9;
1441 /* drbd_drain_block() just takes a data block
1442 * out of the socket input buffer, and discards it.
1444 static int drbd_drain_block(struct drbd_conf *mdev, int data_size)
1453 page = drbd_pp_alloc(mdev, 1, 1);
1457 rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE));
1458 if (rr != min_t(int, data_size, PAGE_SIZE)) {
1460 dev_warn(DEV, "short read receiving data: read %d expected %d\n",
1461 rr, min_t(int, data_size, PAGE_SIZE));
1467 drbd_pp_free(mdev, page, 0);
1471 static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req,
1472 sector_t sector, int data_size)
1474 struct bio_vec *bvec;
1476 int dgs, rr, i, expect;
1477 void *dig_in = mdev->int_dig_in;
1478 void *dig_vv = mdev->int_dig_vv;
1480 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
1481 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
1484 rr = drbd_recv(mdev, dig_in, dgs);
1486 dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n",
1494 /* optimistically update recv_cnt. if receiving fails below,
1495 * we disconnect anyways, and counters will be reset. */
1496 mdev->recv_cnt += data_size>>9;
1498 bio = req->master_bio;
1499 D_ASSERT(sector == bio->bi_sector);
1501 bio_for_each_segment(bvec, bio, i) {
1502 expect = min_t(int, data_size, bvec->bv_len);
1503 rr = drbd_recv(mdev,
1504 kmap(bvec->bv_page)+bvec->bv_offset,
1506 kunmap(bvec->bv_page);
1508 dev_warn(DEV, "short read receiving data reply: "
1509 "read %d expected %d\n",
1517 drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv);
1518 if (memcmp(dig_in, dig_vv, dgs)) {
1519 dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n");
1524 D_ASSERT(data_size == 0);
1528 /* e_end_resync_block() is called via
1529 * drbd_process_done_ee() by asender only */
1530 static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1532 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1533 sector_t sector = e->sector;
1536 D_ASSERT(hlist_unhashed(&e->colision));
1538 if (likely((e->flags & EE_WAS_ERROR) == 0)) {
1539 drbd_set_in_sync(mdev, sector, e->size);
1540 ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e);
1542 /* Record failure to sync */
1543 drbd_rs_failed_io(mdev, sector, e->size);
1545 ok = drbd_send_ack(mdev, P_NEG_ACK, e);
1552 static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local)
1554 struct drbd_epoch_entry *e;
1556 e = read_in_block(mdev, ID_SYNCER, sector, data_size);
1560 dec_rs_pending(mdev);
1563 /* corresponding dec_unacked() in e_end_resync_block()
1564 * respective _drbd_clear_done_ee */
1566 e->w.cb = e_end_resync_block;
1568 spin_lock_irq(&mdev->req_lock);
1569 list_add(&e->w.list, &mdev->sync_ee);
1570 spin_unlock_irq(&mdev->req_lock);
1572 atomic_add(data_size >> 9, &mdev->rs_sect_ev);
1573 if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0)
1576 /* drbd_submit_ee currently fails for one reason only:
1577 * not being able to allocate enough bios.
1578 * Is dropping the connection going to help? */
1579 spin_lock_irq(&mdev->req_lock);
1580 list_del(&e->w.list);
1581 spin_unlock_irq(&mdev->req_lock);
1583 drbd_free_ee(mdev, e);
1589 static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
1591 struct drbd_request *req;
1594 struct p_data *p = &mdev->data.rbuf.data;
1596 sector = be64_to_cpu(p->sector);
1598 spin_lock_irq(&mdev->req_lock);
1599 req = _ar_id_to_req(mdev, p->block_id, sector);
1600 spin_unlock_irq(&mdev->req_lock);
1601 if (unlikely(!req)) {
1602 dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n");
1606 /* hlist_del(&req->colision) is done in _req_may_be_done, to avoid
1607 * special casing it there for the various failure cases.
1608 * still no race with drbd_fail_pending_reads */
1609 ok = recv_dless_read(mdev, req, sector, data_size);
1612 req_mod(req, data_received);
1613 /* else: nothing. handled from drbd_disconnect...
1614 * I don't think we may complete this just yet
1615 * in case we are "on-disconnect: freeze" */
1620 static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
1624 struct p_data *p = &mdev->data.rbuf.data;
1626 sector = be64_to_cpu(p->sector);
1627 D_ASSERT(p->block_id == ID_SYNCER);
1629 if (get_ldev(mdev)) {
1630 /* data is submitted to disk within recv_resync_read.
1631 * corresponding put_ldev done below on error,
1632 * or in drbd_endio_write_sec. */
1633 ok = recv_resync_read(mdev, sector, data_size);
1635 if (__ratelimit(&drbd_ratelimit_state))
1636 dev_err(DEV, "Can not write resync data to local disk.\n");
1638 ok = drbd_drain_block(mdev, data_size);
1640 drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size);
1643 atomic_add(data_size >> 9, &mdev->rs_sect_in);
1648 /* e_end_block() is called via drbd_process_done_ee().
1649 * this means this function only runs in the asender thread
1651 static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
1653 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1654 sector_t sector = e->sector;
1655 struct drbd_epoch *epoch;
1658 if (e->flags & EE_IS_BARRIER) {
1659 epoch = previous_epoch(mdev, e->epoch);
1661 drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE + (cancel ? EV_CLEANUP : 0));
1664 if (mdev->net_conf->wire_protocol == DRBD_PROT_C) {
1665 if (likely((e->flags & EE_WAS_ERROR) == 0)) {
1666 pcmd = (mdev->state.conn >= C_SYNC_SOURCE &&
1667 mdev->state.conn <= C_PAUSED_SYNC_T &&
1668 e->flags & EE_MAY_SET_IN_SYNC) ?
1669 P_RS_WRITE_ACK : P_WRITE_ACK;
1670 ok &= drbd_send_ack(mdev, pcmd, e);
1671 if (pcmd == P_RS_WRITE_ACK)
1672 drbd_set_in_sync(mdev, sector, e->size);
1674 ok = drbd_send_ack(mdev, P_NEG_ACK, e);
1675 /* we expect it to be marked out of sync anyways...
1676 * maybe assert this? */
1680 /* we delete from the conflict detection hash _after_ we sent out the
1681 * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */
1682 if (mdev->net_conf->two_primaries) {
1683 spin_lock_irq(&mdev->req_lock);
1684 D_ASSERT(!hlist_unhashed(&e->colision));
1685 hlist_del_init(&e->colision);
1686 spin_unlock_irq(&mdev->req_lock);
1688 D_ASSERT(hlist_unhashed(&e->colision));
1691 drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0));
1696 static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1698 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1701 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
1702 ok = drbd_send_ack(mdev, P_DISCARD_ACK, e);
1704 spin_lock_irq(&mdev->req_lock);
1705 D_ASSERT(!hlist_unhashed(&e->colision));
1706 hlist_del_init(&e->colision);
1707 spin_unlock_irq(&mdev->req_lock);
1714 /* Called from receive_Data.
1715 * Synchronize packets on sock with packets on msock.
1717 * This is here so even when a P_DATA packet traveling via sock overtook an Ack
1718 * packet traveling on msock, they are still processed in the order they have
1721 * Note: we don't care for Ack packets overtaking P_DATA packets.
1723 * In case packet_seq is larger than mdev->peer_seq number, there are
1724 * outstanding packets on the msock. We wait for them to arrive.
1725 * In case we are the logically next packet, we update mdev->peer_seq
1726 * ourselves. Correctly handles 32bit wrap around.
1728 * Assume we have a 10 GBit connection, that is about 1<<30 byte per second,
1729 * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds
1730 * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have
1731 * 1<<9 == 512 seconds aka ages for the 32bit wrap around...
1733 * returns 0 if we may process the packet,
1734 * -ERESTARTSYS if we were interrupted (by disconnect signal). */
1735 static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq)
1741 spin_lock(&mdev->peer_seq_lock);
1743 prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE);
1744 if (seq_le(packet_seq, mdev->peer_seq+1))
1746 if (signal_pending(current)) {
1750 p_seq = mdev->peer_seq;
1751 spin_unlock(&mdev->peer_seq_lock);
1752 timeout = schedule_timeout(30*HZ);
1753 spin_lock(&mdev->peer_seq_lock);
1754 if (timeout == 0 && p_seq == mdev->peer_seq) {
1756 dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n");
1760 finish_wait(&mdev->seq_wait, &wait);
1761 if (mdev->peer_seq+1 == packet_seq)
1763 spin_unlock(&mdev->peer_seq_lock);
1767 static unsigned long write_flags_to_bio(struct drbd_conf *mdev, u32 dpf)
1769 if (mdev->agreed_pro_version >= 95)
1770 return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) |
1771 (dpf & DP_UNPLUG ? REQ_UNPLUG : 0) |
1772 (dpf & DP_FUA ? REQ_FUA : 0) |
1773 (dpf & DP_FLUSH ? REQ_FUA : 0) |
1774 (dpf & DP_DISCARD ? REQ_DISCARD : 0);
1776 return dpf & DP_RW_SYNC ? (REQ_SYNC | REQ_UNPLUG) : 0;
1779 /* mirrored write */
1780 static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
1783 struct drbd_epoch_entry *e;
1784 struct p_data *p = &mdev->data.rbuf.data;
1788 if (!get_ldev(mdev)) {
1789 if (__ratelimit(&drbd_ratelimit_state))
1790 dev_err(DEV, "Can not write mirrored data block "
1791 "to local disk.\n");
1792 spin_lock(&mdev->peer_seq_lock);
1793 if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num))
1795 spin_unlock(&mdev->peer_seq_lock);
1797 drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size);
1798 atomic_inc(&mdev->current_epoch->epoch_size);
1799 return drbd_drain_block(mdev, data_size);
1802 /* get_ldev(mdev) successful.
1803 * Corresponding put_ldev done either below (on various errors),
1804 * or in drbd_endio_write_sec, if we successfully submit the data at
1805 * the end of this function. */
1807 sector = be64_to_cpu(p->sector);
1808 e = read_in_block(mdev, p->block_id, sector, data_size);
1814 e->w.cb = e_end_block;
1816 spin_lock(&mdev->epoch_lock);
1817 e->epoch = mdev->current_epoch;
1818 atomic_inc(&e->epoch->epoch_size);
1819 atomic_inc(&e->epoch->active);
1821 if (mdev->write_ordering == WO_bio_barrier && atomic_read(&e->epoch->epoch_size) == 1) {
1822 struct drbd_epoch *epoch;
1823 /* Issue a barrier if we start a new epoch, and the previous epoch
1824 was not a epoch containing a single request which already was
1826 epoch = list_entry(e->epoch->list.prev, struct drbd_epoch, list);
1827 if (epoch == e->epoch) {
1828 set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
1829 rw |= REQ_HARDBARRIER;
1830 e->flags |= EE_IS_BARRIER;
1832 if (atomic_read(&epoch->epoch_size) > 1 ||
1833 !test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) {
1834 set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags);
1835 set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
1836 rw |= REQ_HARDBARRIER;
1837 e->flags |= EE_IS_BARRIER;
1841 spin_unlock(&mdev->epoch_lock);
1843 dp_flags = be32_to_cpu(p->dp_flags);
1844 rw |= write_flags_to_bio(mdev, dp_flags);
1846 if (dp_flags & DP_MAY_SET_IN_SYNC)
1847 e->flags |= EE_MAY_SET_IN_SYNC;
1849 /* I'm the receiver, I do hold a net_cnt reference. */
1850 if (!mdev->net_conf->two_primaries) {
1851 spin_lock_irq(&mdev->req_lock);
1853 /* don't get the req_lock yet,
1854 * we may sleep in drbd_wait_peer_seq */
1855 const int size = e->size;
1856 const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1858 struct drbd_request *i;
1859 struct hlist_node *n;
1860 struct hlist_head *slot;
1863 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
1864 BUG_ON(mdev->ee_hash == NULL);
1865 BUG_ON(mdev->tl_hash == NULL);
1867 /* conflict detection and handling:
1868 * 1. wait on the sequence number,
1869 * in case this data packet overtook ACK packets.
1870 * 2. check our hash tables for conflicting requests.
1871 * we only need to walk the tl_hash, since an ee can not
1872 * have a conflict with an other ee: on the submitting
1873 * node, the corresponding req had already been conflicting,
1874 * and a conflicting req is never sent.
1876 * Note: for two_primaries, we are protocol C,
1877 * so there cannot be any request that is DONE
1878 * but still on the transfer log.
1880 * unconditionally add to the ee_hash.
1882 * if no conflicting request is found:
1885 * if any conflicting request is found
1886 * that has not yet been acked,
1887 * AND I have the "discard concurrent writes" flag:
1888 * queue (via done_ee) the P_DISCARD_ACK; OUT.
1890 * if any conflicting request is found:
1891 * block the receiver, waiting on misc_wait
1892 * until no more conflicting requests are there,
1893 * or we get interrupted (disconnect).
1895 * we do not just write after local io completion of those
1896 * requests, but only after req is done completely, i.e.
1897 * we wait for the P_DISCARD_ACK to arrive!
1899 * then proceed normally, i.e. submit.
1901 if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num)))
1902 goto out_interrupted;
1904 spin_lock_irq(&mdev->req_lock);
1906 hlist_add_head(&e->colision, ee_hash_slot(mdev, sector));
1908 #define OVERLAPS overlaps(i->sector, i->size, sector, size)
1909 slot = tl_hash_slot(mdev, sector);
1912 int have_unacked = 0;
1913 int have_conflict = 0;
1914 prepare_to_wait(&mdev->misc_wait, &wait,
1915 TASK_INTERRUPTIBLE);
1916 hlist_for_each_entry(i, n, slot, colision) {
1918 /* only ALERT on first iteration,
1919 * we may be woken up early... */
1921 dev_alert(DEV, "%s[%u] Concurrent local write detected!"
1922 " new: %llus +%u; pending: %llus +%u\n",
1923 current->comm, current->pid,
1924 (unsigned long long)sector, size,
1925 (unsigned long long)i->sector, i->size);
1926 if (i->rq_state & RQ_NET_PENDING)
1935 /* Discard Ack only for the _first_ iteration */
1936 if (first && discard && have_unacked) {
1937 dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n",
1938 (unsigned long long)sector);
1940 e->w.cb = e_send_discard_ack;
1941 list_add_tail(&e->w.list, &mdev->done_ee);
1943 spin_unlock_irq(&mdev->req_lock);
1945 /* we could probably send that P_DISCARD_ACK ourselves,
1946 * but I don't like the receiver using the msock */
1950 finish_wait(&mdev->misc_wait, &wait);
1954 if (signal_pending(current)) {
1955 hlist_del_init(&e->colision);
1957 spin_unlock_irq(&mdev->req_lock);
1959 finish_wait(&mdev->misc_wait, &wait);
1960 goto out_interrupted;
1963 spin_unlock_irq(&mdev->req_lock);
1966 dev_alert(DEV, "Concurrent write! [W AFTERWARDS] "
1967 "sec=%llus\n", (unsigned long long)sector);
1968 } else if (discard) {
1969 /* we had none on the first iteration.
1970 * there must be none now. */
1971 D_ASSERT(have_unacked == 0);
1974 spin_lock_irq(&mdev->req_lock);
1976 finish_wait(&mdev->misc_wait, &wait);
1979 list_add(&e->w.list, &mdev->active_ee);
1980 spin_unlock_irq(&mdev->req_lock);
1982 switch (mdev->net_conf->wire_protocol) {
1985 /* corresponding dec_unacked() in e_end_block()
1986 * respective _drbd_clear_done_ee */
1989 /* I really don't like it that the receiver thread
1990 * sends on the msock, but anyways */
1991 drbd_send_ack(mdev, P_RECV_ACK, e);
1998 if (mdev->state.pdsk == D_DISKLESS) {
1999 /* In case we have the only disk of the cluster, */
2000 drbd_set_out_of_sync(mdev, e->sector, e->size);
2001 e->flags |= EE_CALL_AL_COMPLETE_IO;
2002 drbd_al_begin_io(mdev, e->sector);
2005 if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0)
2008 /* drbd_submit_ee currently fails for one reason only:
2009 * not being able to allocate enough bios.
2010 * Is dropping the connection going to help? */
2011 spin_lock_irq(&mdev->req_lock);
2012 list_del(&e->w.list);
2013 hlist_del_init(&e->colision);
2014 spin_unlock_irq(&mdev->req_lock);
2015 if (e->flags & EE_CALL_AL_COMPLETE_IO)
2016 drbd_al_complete_io(mdev, e->sector);
2019 /* yes, the epoch_size now is imbalanced.
2020 * but we drop the connection anyways, so we don't have a chance to
2021 * receive a barrier... atomic_inc(&mdev->epoch_size); */
2023 drbd_free_ee(mdev, e);
2027 /* We may throttle resync, if the lower device seems to be busy,
2028 * and current sync rate is above c_min_rate.
2030 * To decide whether or not the lower device is busy, we use a scheme similar
2031 * to MD RAID is_mddev_idle(): if the partition stats reveal "significant"
2032 * (more than 64 sectors) of activity we cannot account for with our own resync
2033 * activity, it obviously is "busy".
2035 * The current sync rate used here uses only the most recent two step marks,
2036 * to have a short time average so we can react faster.
2038 int drbd_rs_should_slow_down(struct drbd_conf *mdev)
2040 struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk;
2041 unsigned long db, dt, dbdt;
2045 /* feature disabled? */
2046 if (mdev->sync_conf.c_min_rate == 0)
2049 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
2050 (int)part_stat_read(&disk->part0, sectors[1]) -
2051 atomic_read(&mdev->rs_sect_ev);
2052 if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) {
2053 unsigned long rs_left;
2056 mdev->rs_last_events = curr_events;
2058 /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP,
2060 i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-2) % DRBD_SYNC_MARKS;
2061 rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed;
2063 dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ;
2066 db = mdev->rs_mark_left[i] - rs_left;
2067 dbdt = Bit2KB(db/dt);
2069 if (dbdt > mdev->sync_conf.c_min_rate)
2076 static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int digest_size)
2079 const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
2080 struct drbd_epoch_entry *e;
2081 struct digest_info *di = NULL;
2083 unsigned int fault_type;
2084 struct p_block_req *p = &mdev->data.rbuf.block_req;
2086 sector = be64_to_cpu(p->sector);
2087 size = be32_to_cpu(p->blksize);
2089 if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) {
2090 dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
2091 (unsigned long long)sector, size);
2094 if (sector + (size>>9) > capacity) {
2095 dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
2096 (unsigned long long)sector, size);
2100 if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) {
2101 if (__ratelimit(&drbd_ratelimit_state))
2102 dev_err(DEV, "Can not satisfy peer's read request, "
2103 "no local data.\n");
2104 drbd_send_ack_rp(mdev, cmd == P_DATA_REQUEST ? P_NEG_DREPLY :
2105 P_NEG_RS_DREPLY , p);
2106 /* drain possibly payload */
2107 return drbd_drain_block(mdev, digest_size);
2110 /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
2111 * "criss-cross" setup, that might cause write-out on some other DRBD,
2112 * which in turn might block on the other node at this very place. */
2113 e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO);
2120 case P_DATA_REQUEST:
2121 e->w.cb = w_e_end_data_req;
2122 fault_type = DRBD_FAULT_DT_RD;
2123 /* application IO, don't drbd_rs_begin_io */
2126 case P_RS_DATA_REQUEST:
2127 e->w.cb = w_e_end_rsdata_req;
2128 fault_type = DRBD_FAULT_RS_RD;
2132 case P_CSUM_RS_REQUEST:
2133 fault_type = DRBD_FAULT_RS_RD;
2134 di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO);
2138 di->digest_size = digest_size;
2139 di->digest = (((char *)di)+sizeof(struct digest_info));
2142 e->flags |= EE_HAS_DIGEST;
2144 if (drbd_recv(mdev, di->digest, digest_size) != digest_size)
2147 if (cmd == P_CSUM_RS_REQUEST) {
2148 D_ASSERT(mdev->agreed_pro_version >= 89);
2149 e->w.cb = w_e_end_csum_rs_req;
2150 } else if (cmd == P_OV_REPLY) {
2151 e->w.cb = w_e_end_ov_reply;
2152 dec_rs_pending(mdev);
2153 /* drbd_rs_begin_io done when we sent this request,
2154 * but accounting still needs to be done. */
2155 goto submit_for_resync;
2160 if (mdev->state.conn >= C_CONNECTED &&
2161 mdev->state.conn != C_VERIFY_T)
2162 dev_warn(DEV, "ASSERT FAILED: got P_OV_REQUEST while being %s\n",
2163 drbd_conn_str(mdev->state.conn));
2164 if (mdev->ov_start_sector == ~(sector_t)0 &&
2165 mdev->agreed_pro_version >= 90) {
2166 mdev->ov_start_sector = sector;
2167 mdev->ov_position = sector;
2168 mdev->ov_left = mdev->rs_total - BM_SECT_TO_BIT(sector);
2169 dev_info(DEV, "Online Verify start sector: %llu\n",
2170 (unsigned long long)sector);
2172 e->w.cb = w_e_end_ov_req;
2173 fault_type = DRBD_FAULT_RS_RD;
2177 dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n",
2179 fault_type = DRBD_FAULT_MAX;
2183 /* Throttle, drbd_rs_begin_io and submit should become asynchronous
2184 * wrt the receiver, but it is not as straightforward as it may seem.
2185 * Various places in the resync start and stop logic assume resync
2186 * requests are processed in order, requeuing this on the worker thread
2187 * introduces a bunch of new code for synchronization between threads.
2189 * Unlimited throttling before drbd_rs_begin_io may stall the resync
2190 * "forever", throttling after drbd_rs_begin_io will lock that extent
2191 * for application writes for the same time. For now, just throttle
2192 * here, where the rest of the code expects the receiver to sleep for
2196 /* Throttle before drbd_rs_begin_io, as that locks out application IO;
2197 * this defers syncer requests for some time, before letting at least
2198 * on request through. The resync controller on the receiving side
2199 * will adapt to the incoming rate accordingly.
2201 * We cannot throttle here if remote is Primary/SyncTarget:
2202 * we would also throttle its application reads.
2203 * In that case, throttling is done on the SyncTarget only.
2205 if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev))
2207 if (drbd_rs_begin_io(mdev, e->sector))
2211 atomic_add(size >> 9, &mdev->rs_sect_ev);
2215 spin_lock_irq(&mdev->req_lock);
2216 list_add_tail(&e->w.list, &mdev->read_ee);
2217 spin_unlock_irq(&mdev->req_lock);
2219 if (drbd_submit_ee(mdev, e, READ, fault_type) == 0)
2222 /* drbd_submit_ee currently fails for one reason only:
2223 * not being able to allocate enough bios.
2224 * Is dropping the connection going to help? */
2225 spin_lock_irq(&mdev->req_lock);
2226 list_del(&e->w.list);
2227 spin_unlock_irq(&mdev->req_lock);
2228 /* no drbd_rs_complete_io(), we are dropping the connection anyways */
2232 drbd_free_ee(mdev, e);
2236 static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local)
2238 int self, peer, rv = -100;
2239 unsigned long ch_self, ch_peer;
2241 self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
2242 peer = mdev->p_uuid[UI_BITMAP] & 1;
2244 ch_peer = mdev->p_uuid[UI_SIZE];
2245 ch_self = mdev->comm_bm_set;
2247 switch (mdev->net_conf->after_sb_0p) {
2249 case ASB_DISCARD_SECONDARY:
2250 case ASB_CALL_HELPER:
2251 dev_err(DEV, "Configuration error.\n");
2253 case ASB_DISCONNECT:
2255 case ASB_DISCARD_YOUNGER_PRI:
2256 if (self == 0 && peer == 1) {
2260 if (self == 1 && peer == 0) {
2264 /* Else fall through to one of the other strategies... */
2265 case ASB_DISCARD_OLDER_PRI:
2266 if (self == 0 && peer == 1) {
2270 if (self == 1 && peer == 0) {
2274 /* Else fall through to one of the other strategies... */
2275 dev_warn(DEV, "Discard younger/older primary did not find a decision\n"
2276 "Using discard-least-changes instead\n");
2277 case ASB_DISCARD_ZERO_CHG:
2278 if (ch_peer == 0 && ch_self == 0) {
2279 rv = test_bit(DISCARD_CONCURRENT, &mdev->flags)
2283 if (ch_peer == 0) { rv = 1; break; }
2284 if (ch_self == 0) { rv = -1; break; }
2286 if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG)
2288 case ASB_DISCARD_LEAST_CHG:
2289 if (ch_self < ch_peer)
2291 else if (ch_self > ch_peer)
2293 else /* ( ch_self == ch_peer ) */
2294 /* Well, then use something else. */
2295 rv = test_bit(DISCARD_CONCURRENT, &mdev->flags)
2298 case ASB_DISCARD_LOCAL:
2301 case ASB_DISCARD_REMOTE:
2308 static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local)
2310 int self, peer, hg, rv = -100;
2312 self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
2313 peer = mdev->p_uuid[UI_BITMAP] & 1;
2315 switch (mdev->net_conf->after_sb_1p) {
2316 case ASB_DISCARD_YOUNGER_PRI:
2317 case ASB_DISCARD_OLDER_PRI:
2318 case ASB_DISCARD_LEAST_CHG:
2319 case ASB_DISCARD_LOCAL:
2320 case ASB_DISCARD_REMOTE:
2321 dev_err(DEV, "Configuration error.\n");
2323 case ASB_DISCONNECT:
2326 hg = drbd_asb_recover_0p(mdev);
2327 if (hg == -1 && mdev->state.role == R_SECONDARY)
2329 if (hg == 1 && mdev->state.role == R_PRIMARY)
2333 rv = drbd_asb_recover_0p(mdev);
2335 case ASB_DISCARD_SECONDARY:
2336 return mdev->state.role == R_PRIMARY ? 1 : -1;
2337 case ASB_CALL_HELPER:
2338 hg = drbd_asb_recover_0p(mdev);
2339 if (hg == -1 && mdev->state.role == R_PRIMARY) {
2340 self = drbd_set_role(mdev, R_SECONDARY, 0);
2341 /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
2342 * we might be here in C_WF_REPORT_PARAMS which is transient.
2343 * we do not need to wait for the after state change work either. */
2344 self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY));
2345 if (self != SS_SUCCESS) {
2346 drbd_khelper(mdev, "pri-lost-after-sb");
2348 dev_warn(DEV, "Successfully gave up primary role.\n");
2358 static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local)
2360 int self, peer, hg, rv = -100;
2362 self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
2363 peer = mdev->p_uuid[UI_BITMAP] & 1;
2365 switch (mdev->net_conf->after_sb_2p) {
2366 case ASB_DISCARD_YOUNGER_PRI:
2367 case ASB_DISCARD_OLDER_PRI:
2368 case ASB_DISCARD_LEAST_CHG:
2369 case ASB_DISCARD_LOCAL:
2370 case ASB_DISCARD_REMOTE:
2372 case ASB_DISCARD_SECONDARY:
2373 dev_err(DEV, "Configuration error.\n");
2376 rv = drbd_asb_recover_0p(mdev);
2378 case ASB_DISCONNECT:
2380 case ASB_CALL_HELPER:
2381 hg = drbd_asb_recover_0p(mdev);
2383 /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
2384 * we might be here in C_WF_REPORT_PARAMS which is transient.
2385 * we do not need to wait for the after state change work either. */
2386 self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY));
2387 if (self != SS_SUCCESS) {
2388 drbd_khelper(mdev, "pri-lost-after-sb");
2390 dev_warn(DEV, "Successfully gave up primary role.\n");
2400 static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid,
2401 u64 bits, u64 flags)
2404 dev_info(DEV, "%s uuid info vanished while I was looking!\n", text);
2407 dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n",
2409 (unsigned long long)uuid[UI_CURRENT],
2410 (unsigned long long)uuid[UI_BITMAP],
2411 (unsigned long long)uuid[UI_HISTORY_START],
2412 (unsigned long long)uuid[UI_HISTORY_END],
2413 (unsigned long long)bits,
2414 (unsigned long long)flags);
2418 100 after split brain try auto recover
2419 2 C_SYNC_SOURCE set BitMap
2420 1 C_SYNC_SOURCE use BitMap
2422 -1 C_SYNC_TARGET use BitMap
2423 -2 C_SYNC_TARGET set BitMap
2424 -100 after split brain, disconnect
2425 -1000 unrelated data
2427 static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local)
2432 self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
2433 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
2436 if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED)
2440 if ((self == UUID_JUST_CREATED || self == (u64)0) &&
2441 peer != UUID_JUST_CREATED)
2445 if (self != UUID_JUST_CREATED &&
2446 (peer == UUID_JUST_CREATED || peer == (u64)0))
2450 int rct, dc; /* roles at crash time */
2452 if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) {
2454 if (mdev->agreed_pro_version < 91)
2457 if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) &&
2458 (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) {
2459 dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n");
2460 drbd_uuid_set_bm(mdev, 0UL);
2462 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid,
2463 mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0);
2466 dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n");
2473 if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) {
2475 if (mdev->agreed_pro_version < 91)
2478 if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) &&
2479 (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) {
2480 dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n");
2482 mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START];
2483 mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP];
2484 mdev->p_uuid[UI_BITMAP] = 0UL;
2486 drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
2489 dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n");
2496 /* Common power [off|failure] */
2497 rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) +
2498 (mdev->p_uuid[UI_FLAGS] & 2);
2499 /* lowest bit is set when we were primary,
2500 * next bit (weight 2) is set when peer was primary */
2504 case 0: /* !self_pri && !peer_pri */ return 0;
2505 case 1: /* self_pri && !peer_pri */ return 1;
2506 case 2: /* !self_pri && peer_pri */ return -1;
2507 case 3: /* self_pri && peer_pri */
2508 dc = test_bit(DISCARD_CONCURRENT, &mdev->flags);
2514 peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1);
2519 peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1);
2521 self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1);
2522 peer = mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1);
2524 /* The last P_SYNC_UUID did not get though. Undo the last start of
2525 resync as sync source modifications of the peer's UUIDs. */
2527 if (mdev->agreed_pro_version < 91)
2530 mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START];
2531 mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1];
2537 self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
2538 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2539 peer = mdev->p_uuid[i] & ~((u64)1);
2545 self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
2546 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
2551 self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1);
2553 self = mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1);
2554 peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1);
2556 /* The last P_SYNC_UUID did not get though. Undo the last start of
2557 resync as sync source modifications of our UUIDs. */
2559 if (mdev->agreed_pro_version < 91)
2562 _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]);
2563 _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]);
2565 dev_info(DEV, "Undid last start of resync:\n");
2567 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid,
2568 mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0);
2576 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
2577 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2578 self = mdev->ldev->md.uuid[i] & ~((u64)1);
2584 self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
2585 peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1);
2586 if (self == peer && self != ((u64)0))
2590 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2591 self = mdev->ldev->md.uuid[i] & ~((u64)1);
2592 for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) {
2593 peer = mdev->p_uuid[j] & ~((u64)1);
2602 /* drbd_sync_handshake() returns the new conn state on success, or
2603 CONN_MASK (-1) on failure.
2605 static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role,
2606 enum drbd_disk_state peer_disk) __must_hold(local)
2609 enum drbd_conns rv = C_MASK;
2610 enum drbd_disk_state mydisk;
2612 mydisk = mdev->state.disk;
2613 if (mydisk == D_NEGOTIATING)
2614 mydisk = mdev->new_state_tmp.disk;
2616 dev_info(DEV, "drbd_sync_handshake:\n");
2617 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0);
2618 drbd_uuid_dump(mdev, "peer", mdev->p_uuid,
2619 mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
2621 hg = drbd_uuid_compare(mdev, &rule_nr);
2623 dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr);
2626 dev_alert(DEV, "Unrelated data, aborting!\n");
2630 dev_alert(DEV, "To resolve this both sides have to support at least protocol\n");
2634 if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) ||
2635 (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) {
2636 int f = (hg == -100) || abs(hg) == 2;
2637 hg = mydisk > D_INCONSISTENT ? 1 : -1;
2640 dev_info(DEV, "Becoming sync %s due to disk states.\n",
2641 hg > 0 ? "source" : "target");
2645 drbd_khelper(mdev, "initial-split-brain");
2647 if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) {
2648 int pcount = (mdev->state.role == R_PRIMARY)
2649 + (peer_role == R_PRIMARY);
2650 int forced = (hg == -100);
2654 hg = drbd_asb_recover_0p(mdev);
2657 hg = drbd_asb_recover_1p(mdev);
2660 hg = drbd_asb_recover_2p(mdev);
2663 if (abs(hg) < 100) {
2664 dev_warn(DEV, "Split-Brain detected, %d primaries, "
2665 "automatically solved. Sync from %s node\n",
2666 pcount, (hg < 0) ? "peer" : "this");
2668 dev_warn(DEV, "Doing a full sync, since"
2669 " UUIDs where ambiguous.\n");
2676 if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1))
2678 if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1))
2682 dev_warn(DEV, "Split-Brain detected, manually solved. "
2683 "Sync from %s node\n",
2684 (hg < 0) ? "peer" : "this");
2688 /* FIXME this log message is not correct if we end up here
2689 * after an attempted attach on a diskless node.
2690 * We just refuse to attach -- well, we drop the "connection"
2691 * to that disk, in a way... */
2692 dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n");
2693 drbd_khelper(mdev, "split-brain");
2697 if (hg > 0 && mydisk <= D_INCONSISTENT) {
2698 dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n");
2702 if (hg < 0 && /* by intention we do not use mydisk here. */
2703 mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) {
2704 switch (mdev->net_conf->rr_conflict) {
2705 case ASB_CALL_HELPER:
2706 drbd_khelper(mdev, "pri-lost");
2708 case ASB_DISCONNECT:
2709 dev_err(DEV, "I shall become SyncTarget, but I am primary!\n");
2712 dev_warn(DEV, "Becoming SyncTarget, violating the stable-data"
2717 if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) {
2719 dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n");
2721 dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.",
2722 drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET),
2723 abs(hg) >= 2 ? "full" : "bit-map based");
2728 dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n");
2729 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake"))
2733 if (hg > 0) { /* become sync source. */
2735 } else if (hg < 0) { /* become sync target */
2739 if (drbd_bm_total_weight(mdev)) {
2740 dev_info(DEV, "No resync, but %lu bits in bitmap!\n",
2741 drbd_bm_total_weight(mdev));
2748 /* returns 1 if invalid */
2749 static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self)
2751 /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */
2752 if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) ||
2753 (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL))
2756 /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */
2757 if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL ||
2758 self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL)
2761 /* everything else is valid if they are equal on both sides. */
2765 /* everything es is invalid. */
2769 static int receive_protocol(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
2771 struct p_protocol *p = &mdev->data.rbuf.protocol;
2772 int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p;
2773 int p_want_lose, p_two_primaries, cf;
2774 char p_integrity_alg[SHARED_SECRET_MAX] = "";
2776 p_proto = be32_to_cpu(p->protocol);
2777 p_after_sb_0p = be32_to_cpu(p->after_sb_0p);
2778 p_after_sb_1p = be32_to_cpu(p->after_sb_1p);
2779 p_after_sb_2p = be32_to_cpu(p->after_sb_2p);
2780 p_two_primaries = be32_to_cpu(p->two_primaries);
2781 cf = be32_to_cpu(p->conn_flags);
2782 p_want_lose = cf & CF_WANT_LOSE;
2784 clear_bit(CONN_DRY_RUN, &mdev->flags);
2786 if (cf & CF_DRY_RUN)
2787 set_bit(CONN_DRY_RUN, &mdev->flags);
2789 if (p_proto != mdev->net_conf->wire_protocol) {
2790 dev_err(DEV, "incompatible communication protocols\n");
2794 if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) {
2795 dev_err(DEV, "incompatible after-sb-0pri settings\n");
2799 if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) {
2800 dev_err(DEV, "incompatible after-sb-1pri settings\n");
2804 if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) {
2805 dev_err(DEV, "incompatible after-sb-2pri settings\n");
2809 if (p_want_lose && mdev->net_conf->want_lose) {
2810 dev_err(DEV, "both sides have the 'want_lose' flag set\n");
2814 if (p_two_primaries != mdev->net_conf->two_primaries) {
2815 dev_err(DEV, "incompatible setting of the two-primaries options\n");
2819 if (mdev->agreed_pro_version >= 87) {
2820 unsigned char *my_alg = mdev->net_conf->integrity_alg;
2822 if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size)
2825 p_integrity_alg[SHARED_SECRET_MAX-1] = 0;
2826 if (strcmp(p_integrity_alg, my_alg)) {
2827 dev_err(DEV, "incompatible setting of the data-integrity-alg\n");
2830 dev_info(DEV, "data-integrity-alg: %s\n",
2831 my_alg[0] ? my_alg : (unsigned char *)"<not-used>");
2837 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2842 * input: alg name, feature name
2843 * return: NULL (alg name was "")
2844 * ERR_PTR(error) if something goes wrong
2845 * or the crypto hash ptr, if it worked out ok. */
2846 struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev,
2847 const char *alg, const char *name)
2849 struct crypto_hash *tfm;
2854 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
2856 dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n",
2857 alg, name, PTR_ERR(tfm));
2860 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
2861 crypto_free_hash(tfm);
2862 dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name);
2863 return ERR_PTR(-EINVAL);
2868 static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int packet_size)
2871 struct p_rs_param_95 *p = &mdev->data.rbuf.rs_param_95;
2872 unsigned int header_size, data_size, exp_max_sz;
2873 struct crypto_hash *verify_tfm = NULL;
2874 struct crypto_hash *csums_tfm = NULL;
2875 const int apv = mdev->agreed_pro_version;
2876 int *rs_plan_s = NULL;
2879 exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param)
2880 : apv == 88 ? sizeof(struct p_rs_param)
2882 : apv <= 94 ? sizeof(struct p_rs_param_89)
2883 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
2885 if (packet_size > exp_max_sz) {
2886 dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n",
2887 packet_size, exp_max_sz);
2892 header_size = sizeof(struct p_rs_param) - sizeof(struct p_header80);
2893 data_size = packet_size - header_size;
2894 } else if (apv <= 94) {
2895 header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header80);
2896 data_size = packet_size - header_size;
2897 D_ASSERT(data_size == 0);
2899 header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header80);
2900 data_size = packet_size - header_size;
2901 D_ASSERT(data_size == 0);
2904 /* initialize verify_alg and csums_alg */
2905 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
2907 if (drbd_recv(mdev, &p->head.payload, header_size) != header_size)
2910 mdev->sync_conf.rate = be32_to_cpu(p->rate);
2914 if (data_size > SHARED_SECRET_MAX) {
2915 dev_err(DEV, "verify-alg too long, "
2916 "peer wants %u, accepting only %u byte\n",
2917 data_size, SHARED_SECRET_MAX);
2921 if (drbd_recv(mdev, p->verify_alg, data_size) != data_size)
2924 /* we expect NUL terminated string */
2925 /* but just in case someone tries to be evil */
2926 D_ASSERT(p->verify_alg[data_size-1] == 0);
2927 p->verify_alg[data_size-1] = 0;
2929 } else /* apv >= 89 */ {
2930 /* we still expect NUL terminated strings */
2931 /* but just in case someone tries to be evil */
2932 D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0);
2933 D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0);
2934 p->verify_alg[SHARED_SECRET_MAX-1] = 0;
2935 p->csums_alg[SHARED_SECRET_MAX-1] = 0;
2938 if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) {
2939 if (mdev->state.conn == C_WF_REPORT_PARAMS) {
2940 dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n",
2941 mdev->sync_conf.verify_alg, p->verify_alg);
2944 verify_tfm = drbd_crypto_alloc_digest_safe(mdev,
2945 p->verify_alg, "verify-alg");
2946 if (IS_ERR(verify_tfm)) {
2952 if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) {
2953 if (mdev->state.conn == C_WF_REPORT_PARAMS) {
2954 dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n",
2955 mdev->sync_conf.csums_alg, p->csums_alg);
2958 csums_tfm = drbd_crypto_alloc_digest_safe(mdev,
2959 p->csums_alg, "csums-alg");
2960 if (IS_ERR(csums_tfm)) {
2967 mdev->sync_conf.rate = be32_to_cpu(p->rate);
2968 mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead);
2969 mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target);
2970 mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target);
2971 mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate);
2973 fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
2974 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
2975 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
2977 dev_err(DEV, "kmalloc of fifo_buffer failed");
2983 spin_lock(&mdev->peer_seq_lock);
2984 /* lock against drbd_nl_syncer_conf() */
2986 strcpy(mdev->sync_conf.verify_alg, p->verify_alg);
2987 mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1;
2988 crypto_free_hash(mdev->verify_tfm);
2989 mdev->verify_tfm = verify_tfm;
2990 dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg);
2993 strcpy(mdev->sync_conf.csums_alg, p->csums_alg);
2994 mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1;
2995 crypto_free_hash(mdev->csums_tfm);
2996 mdev->csums_tfm = csums_tfm;
2997 dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg);
2999 if (fifo_size != mdev->rs_plan_s.size) {
3000 kfree(mdev->rs_plan_s.values);
3001 mdev->rs_plan_s.values = rs_plan_s;
3002 mdev->rs_plan_s.size = fifo_size;
3003 mdev->rs_planed = 0;
3005 spin_unlock(&mdev->peer_seq_lock);
3010 /* just for completeness: actually not needed,
3011 * as this is not reached if csums_tfm was ok. */
3012 crypto_free_hash(csums_tfm);
3013 /* but free the verify_tfm again, if csums_tfm did not work out */
3014 crypto_free_hash(verify_tfm);
3015 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3019 static void drbd_setup_order_type(struct drbd_conf *mdev, int peer)
3021 /* sorry, we currently have no working implementation
3022 * of distributed TCQ */
3025 /* warn if the arguments differ by more than 12.5% */
3026 static void warn_if_differ_considerably(struct drbd_conf *mdev,
3027 const char *s, sector_t a, sector_t b)
3030 if (a == 0 || b == 0)
3032 d = (a > b) ? (a - b) : (b - a);
3033 if (d > (a>>3) || d > (b>>3))
3034 dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s,
3035 (unsigned long long)a, (unsigned long long)b);
3038 static int receive_sizes(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3040 struct p_sizes *p = &mdev->data.rbuf.sizes;
3041 enum determine_dev_size dd = unchanged;
3042 unsigned int max_seg_s;
3043 sector_t p_size, p_usize, my_usize;
3044 int ldsc = 0; /* local disk size changed */
3045 enum dds_flags ddsf;
3047 p_size = be64_to_cpu(p->d_size);
3048 p_usize = be64_to_cpu(p->u_size);
3050 if (p_size == 0 && mdev->state.disk == D_DISKLESS) {
3051 dev_err(DEV, "some backing storage is needed\n");
3052 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3056 /* just store the peer's disk size for now.
3057 * we still need to figure out whether we accept that. */
3058 mdev->p_size = p_size;
3060 #define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r))
3061 if (get_ldev(mdev)) {
3062 warn_if_differ_considerably(mdev, "lower level device sizes",
3063 p_size, drbd_get_max_capacity(mdev->ldev));
3064 warn_if_differ_considerably(mdev, "user requested size",
3065 p_usize, mdev->ldev->dc.disk_size);
3067 /* if this is the first connect, or an otherwise expected
3068 * param exchange, choose the minimum */
3069 if (mdev->state.conn == C_WF_REPORT_PARAMS)
3070 p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size,
3073 my_usize = mdev->ldev->dc.disk_size;
3075 if (mdev->ldev->dc.disk_size != p_usize) {
3076 mdev->ldev->dc.disk_size = p_usize;
3077 dev_info(DEV, "Peer sets u_size to %lu sectors\n",
3078 (unsigned long)mdev->ldev->dc.disk_size);
3081 /* Never shrink a device with usable data during connect.
3082 But allow online shrinking if we are connected. */
3083 if (drbd_new_dev_size(mdev, mdev->ldev, 0) <
3084 drbd_get_capacity(mdev->this_bdev) &&
3085 mdev->state.disk >= D_OUTDATED &&
3086 mdev->state.conn < C_CONNECTED) {
3087 dev_err(DEV, "The peer's disk size is too small!\n");
3088 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3089 mdev->ldev->dc.disk_size = my_usize;
3097 ddsf = be16_to_cpu(p->dds_flags);
3098 if (get_ldev(mdev)) {
3099 dd = drbd_determin_dev_size(mdev, ddsf);
3101 if (dd == dev_size_error)
3105 /* I am diskless, need to accept the peer's size. */
3106 drbd_set_my_capacity(mdev, p_size);
3109 if (get_ldev(mdev)) {
3110 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) {
3111 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
3115 if (mdev->agreed_pro_version < 94)
3116 max_seg_s = be32_to_cpu(p->max_segment_size);
3117 else if (mdev->agreed_pro_version == 94)
3118 max_seg_s = DRBD_MAX_SIZE_H80_PACKET;
3119 else /* drbd 8.3.8 onwards */
3120 max_seg_s = DRBD_MAX_SEGMENT_SIZE;
3122 if (max_seg_s != queue_max_segment_size(mdev->rq_queue))
3123 drbd_setup_queue_param(mdev, max_seg_s);
3125 drbd_setup_order_type(mdev, be16_to_cpu(p->queue_order_type));
3129 if (mdev->state.conn > C_WF_REPORT_PARAMS) {
3130 if (be64_to_cpu(p->c_size) !=
3131 drbd_get_capacity(mdev->this_bdev) || ldsc) {
3132 /* we have different sizes, probably peer
3133 * needs to know my new size... */
3134 drbd_send_sizes(mdev, 0, ddsf);
3136 if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) ||
3137 (dd == grew && mdev->state.conn == C_CONNECTED)) {
3138 if (mdev->state.pdsk >= D_INCONSISTENT &&
3139 mdev->state.disk >= D_INCONSISTENT) {
3140 if (ddsf & DDSF_NO_RESYNC)
3141 dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n");
3143 resync_after_online_grow(mdev);
3145 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
3152 static int receive_uuids(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3154 struct p_uuids *p = &mdev->data.rbuf.uuids;
3158 p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO);
3160 for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++)
3161 p_uuid[i] = be64_to_cpu(p->uuid[i]);
3163 kfree(mdev->p_uuid);
3164 mdev->p_uuid = p_uuid;
3166 if (mdev->state.conn < C_CONNECTED &&
3167 mdev->state.disk < D_INCONSISTENT &&
3168 mdev->state.role == R_PRIMARY &&
3169 (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) {
3170 dev_err(DEV, "Can only connect to data with current UUID=%016llX\n",
3171 (unsigned long long)mdev->ed_uuid);
3172 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3176 if (get_ldev(mdev)) {
3177 int skip_initial_sync =
3178 mdev->state.conn == C_CONNECTED &&
3179 mdev->agreed_pro_version >= 90 &&
3180 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED &&
3181 (p_uuid[UI_FLAGS] & 8);
3182 if (skip_initial_sync) {
3183 dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n");
3184 drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
3185 "clear_n_write from receive_uuids");
3186 _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]);
3187 _drbd_uuid_set(mdev, UI_BITMAP, 0);
3188 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3193 } else if (mdev->state.disk < D_INCONSISTENT &&
3194 mdev->state.role == R_PRIMARY) {
3195 /* I am a diskless primary, the peer just created a new current UUID
3197 drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]);
3200 /* Before we test for the disk state, we should wait until an eventually
3201 ongoing cluster wide state change is finished. That is important if
3202 we are primary and are detaching from our disk. We need to see the
3203 new disk state... */
3204 wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags));
3205 if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT)
3206 drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]);
3212 * convert_state() - Converts the peer's view of the cluster state to our point of view
3213 * @ps: The state as seen by the peer.
3215 static union drbd_state convert_state(union drbd_state ps)
3217 union drbd_state ms;
3219 static enum drbd_conns c_tab[] = {
3220 [C_CONNECTED] = C_CONNECTED,
3222 [C_STARTING_SYNC_S] = C_STARTING_SYNC_T,
3223 [C_STARTING_SYNC_T] = C_STARTING_SYNC_S,
3224 [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */
3225 [C_VERIFY_S] = C_VERIFY_T,
3231 ms.conn = c_tab[ps.conn];
3236 ms.peer_isp = (ps.aftr_isp | ps.user_isp);
3241 static int receive_req_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3243 struct p_req_state *p = &mdev->data.rbuf.req_state;
3244 union drbd_state mask, val;
3247 mask.i = be32_to_cpu(p->mask);
3248 val.i = be32_to_cpu(p->val);
3250 if (test_bit(DISCARD_CONCURRENT, &mdev->flags) &&
3251 test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) {
3252 drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG);
3256 mask = convert_state(mask);
3257 val = convert_state(val);
3259 rv = drbd_change_state(mdev, CS_VERBOSE, mask, val);
3261 drbd_send_sr_reply(mdev, rv);
3267 static int receive_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3269 struct p_state *p = &mdev->data.rbuf.state;
3270 union drbd_state os, ns, peer_state;
3271 enum drbd_disk_state real_peer_disk;
3272 enum chg_state_flags cs_flags;
3275 peer_state.i = be32_to_cpu(p->state);
3277 real_peer_disk = peer_state.disk;
3278 if (peer_state.disk == D_NEGOTIATING) {
3279 real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT;
3280 dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk));
3283 spin_lock_irq(&mdev->req_lock);
3285 os = ns = mdev->state;
3286 spin_unlock_irq(&mdev->req_lock);
3288 /* peer says his disk is uptodate, while we think it is inconsistent,
3289 * and this happens while we think we have a sync going on. */
3290 if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE &&
3291 os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) {
3292 /* If we are (becoming) SyncSource, but peer is still in sync
3293 * preparation, ignore its uptodate-ness to avoid flapping, it
3294 * will change to inconsistent once the peer reaches active
3296 * It may have changed syncer-paused flags, however, so we
3297 * cannot ignore this completely. */
3298 if (peer_state.conn > C_CONNECTED &&
3299 peer_state.conn < C_SYNC_SOURCE)
3300 real_peer_disk = D_INCONSISTENT;
3302 /* if peer_state changes to connected at the same time,
3303 * it explicitly notifies us that it finished resync.
3304 * Maybe we should finish it up, too? */
3305 else if (os.conn >= C_SYNC_SOURCE &&
3306 peer_state.conn == C_CONNECTED) {
3307 if (drbd_bm_total_weight(mdev) <= mdev->rs_failed)
3308 drbd_resync_finished(mdev);
3313 /* peer says his disk is inconsistent, while we think it is uptodate,
3314 * and this happens while the peer still thinks we have a sync going on,
3315 * but we think we are already done with the sync.
3316 * We ignore this to avoid flapping pdsk.
3317 * This should not happen, if the peer is a recent version of drbd. */
3318 if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT &&
3319 os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE)
3320 real_peer_disk = D_UP_TO_DATE;
3322 if (ns.conn == C_WF_REPORT_PARAMS)
3323 ns.conn = C_CONNECTED;
3325 if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING &&
3326 get_ldev_if_state(mdev, D_NEGOTIATING)) {
3327 int cr; /* consider resync */
3329 /* if we established a new connection */
3330 cr = (os.conn < C_CONNECTED);
3331 /* if we had an established connection
3332 * and one of the nodes newly attaches a disk */
3333 cr |= (os.conn == C_CONNECTED &&
3334 (peer_state.disk == D_NEGOTIATING ||
3335 os.disk == D_NEGOTIATING));
3336 /* if we have both been inconsistent, and the peer has been
3337 * forced to be UpToDate with --overwrite-data */
3338 cr |= test_bit(CONSIDER_RESYNC, &mdev->flags);
3339 /* if we had been plain connected, and the admin requested to
3340 * start a sync by "invalidate" or "invalidate-remote" */
3341 cr |= (os.conn == C_CONNECTED &&
3342 (peer_state.conn >= C_STARTING_SYNC_S &&
3343 peer_state.conn <= C_WF_BITMAP_T));
3346 ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk);
3349 if (ns.conn == C_MASK) {
3350 ns.conn = C_CONNECTED;
3351 if (mdev->state.disk == D_NEGOTIATING) {
3352 drbd_force_state(mdev, NS(disk, D_DISKLESS));
3353 } else if (peer_state.disk == D_NEGOTIATING) {
3354 dev_err(DEV, "Disk attach process on the peer node was aborted.\n");
3355 peer_state.disk = D_DISKLESS;
3356 real_peer_disk = D_DISKLESS;
3358 if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags))
3360 D_ASSERT(os.conn == C_WF_REPORT_PARAMS);
3361 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3367 spin_lock_irq(&mdev->req_lock);
3368 if (mdev->state.i != os.i)
3370 clear_bit(CONSIDER_RESYNC, &mdev->flags);
3371 ns.peer = peer_state.role;
3372 ns.pdsk = real_peer_disk;
3373 ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp);
3374 if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING)
3375 ns.disk = mdev->new_state_tmp.disk;
3376 cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD);
3377 if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED &&
3378 test_bit(NEW_CUR_UUID, &mdev->flags)) {
3379 /* Do not allow tl_restart(resend) for a rebooted peer. We can only allow this
3380 for temporal network outages! */
3381 spin_unlock_irq(&mdev->req_lock);
3382 dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n");
3384 drbd_uuid_new_current(mdev);
3385 clear_bit(NEW_CUR_UUID, &mdev->flags);
3386 drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0));
3389 rv = _drbd_set_state(mdev, ns, cs_flags, NULL);
3391 spin_unlock_irq(&mdev->req_lock);
3393 if (rv < SS_SUCCESS) {
3394 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3398 if (os.conn > C_WF_REPORT_PARAMS) {
3399 if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED &&
3400 peer_state.disk != D_NEGOTIATING ) {
3401 /* we want resync, peer has not yet decided to sync... */
3402 /* Nowadays only used when forcing a node into primary role and
3403 setting its disk to UpToDate with that */
3404 drbd_send_uuids(mdev);
3405 drbd_send_state(mdev);
3409 mdev->net_conf->want_lose = 0;
3411 drbd_md_sync(mdev); /* update connected indicator, la_size, ... */
3416 static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3418 struct p_rs_uuid *p = &mdev->data.rbuf.rs_uuid;
3420 wait_event(mdev->misc_wait,
3421 mdev->state.conn == C_WF_SYNC_UUID ||
3422 mdev->state.conn < C_CONNECTED ||
3423 mdev->state.disk < D_NEGOTIATING);
3425 /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */
3427 /* Here the _drbd_uuid_ functions are right, current should
3428 _not_ be rotated into the history */
3429 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
3430 _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid));
3431 _drbd_uuid_set(mdev, UI_BITMAP, 0UL);
3433 drbd_start_resync(mdev, C_SYNC_TARGET);
3437 dev_err(DEV, "Ignoring SyncUUID packet!\n");
3442 enum receive_bitmap_ret { OK, DONE, FAILED };
3444 static enum receive_bitmap_ret
3445 receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size,
3446 unsigned long *buffer, struct bm_xfer_ctx *c)
3448 unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
3449 unsigned want = num_words * sizeof(long);
3451 if (want != data_size) {
3452 dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size);
3457 if (drbd_recv(mdev, buffer, want) != want)
3460 drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer);
3462 c->word_offset += num_words;
3463 c->bit_offset = c->word_offset * BITS_PER_LONG;
3464 if (c->bit_offset > c->bm_bits)
3465 c->bit_offset = c->bm_bits;
3470 static enum receive_bitmap_ret
3471 recv_bm_rle_bits(struct drbd_conf *mdev,
3472 struct p_compressed_bm *p,
3473 struct bm_xfer_ctx *c)
3475 struct bitstream bs;
3479 unsigned long s = c->bit_offset;
3481 int len = be16_to_cpu(p->head.length) - (sizeof(*p) - sizeof(p->head));
3482 int toggle = DCBP_get_start(p);
3486 bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p));
3488 bits = bitstream_get_bits(&bs, &look_ahead, 64);
3492 for (have = bits; have > 0; s += rl, toggle = !toggle) {
3493 bits = vli_decode_bits(&rl, look_ahead);
3499 if (e >= c->bm_bits) {
3500 dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e);
3503 _drbd_bm_set_bits(mdev, s, e);
3507 dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n",
3508 have, bits, look_ahead,
3509 (unsigned int)(bs.cur.b - p->code),
3510 (unsigned int)bs.buf_len);
3513 look_ahead >>= bits;
3516 bits = bitstream_get_bits(&bs, &tmp, 64 - have);
3519 look_ahead |= tmp << have;
3524 bm_xfer_ctx_bit_to_word_offset(c);
3526 return (s == c->bm_bits) ? DONE : OK;
3529 static enum receive_bitmap_ret
3530 decode_bitmap_c(struct drbd_conf *mdev,
3531 struct p_compressed_bm *p,
3532 struct bm_xfer_ctx *c)
3534 if (DCBP_get_code(p) == RLE_VLI_Bits)
3535 return recv_bm_rle_bits(mdev, p, c);
3537 /* other variants had been implemented for evaluation,
3538 * but have been dropped as this one turned out to be "best"
3539 * during all our tests. */
3541 dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding);
3542 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
3546 void INFO_bm_xfer_stats(struct drbd_conf *mdev,
3547 const char *direction, struct bm_xfer_ctx *c)
3549 /* what would it take to transfer it "plaintext" */
3550 unsigned plain = sizeof(struct p_header80) *
3551 ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1)
3552 + c->bm_words * sizeof(long);
3553 unsigned total = c->bytes[0] + c->bytes[1];
3556 /* total can not be zero. but just in case: */
3560 /* don't report if not compressed */
3564 /* total < plain. check for overflow, still */
3565 r = (total > UINT_MAX/1000) ? (total / (plain/1000))
3566 : (1000 * total / plain);
3572 dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), "
3573 "total %u; compression: %u.%u%%\n",
3575 c->bytes[1], c->packets[1],
3576 c->bytes[0], c->packets[0],
3577 total, r/10, r % 10);
3580 /* Since we are processing the bitfield from lower addresses to higher,
3581 it does not matter if the process it in 32 bit chunks or 64 bit
3582 chunks as long as it is little endian. (Understand it as byte stream,
3583 beginning with the lowest byte...) If we would use big endian
3584 we would need to process it from the highest address to the lowest,
3585 in order to be agnostic to the 32 vs 64 bits issue.
3587 returns 0 on failure, 1 if we successfully received it. */
3588 static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3590 struct bm_xfer_ctx c;
3592 enum receive_bitmap_ret ret;
3594 struct p_header80 *h = &mdev->data.rbuf.header.h80;
3596 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
3598 drbd_bm_lock(mdev, "receive bitmap");
3600 /* maybe we should use some per thread scratch page,
3601 * and allocate that during initial device creation? */
3602 buffer = (unsigned long *) __get_free_page(GFP_NOIO);
3604 dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
3608 c = (struct bm_xfer_ctx) {
3609 .bm_bits = drbd_bm_bits(mdev),
3610 .bm_words = drbd_bm_words(mdev),
3614 if (cmd == P_BITMAP) {
3615 ret = receive_bitmap_plain(mdev, data_size, buffer, &c);
3616 } else if (cmd == P_COMPRESSED_BITMAP) {
3617 /* MAYBE: sanity check that we speak proto >= 90,
3618 * and the feature is enabled! */
3619 struct p_compressed_bm *p;
3621 if (data_size > BM_PACKET_PAYLOAD_BYTES) {
3622 dev_err(DEV, "ReportCBitmap packet too large\n");
3625 /* use the page buff */
3627 memcpy(p, h, sizeof(*h));
3628 if (drbd_recv(mdev, p->head.payload, data_size) != data_size)
3630 if (data_size <= (sizeof(*p) - sizeof(p->head))) {
3631 dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size);
3634 ret = decode_bitmap_c(mdev, p, &c);
3636 dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd);
3640 c.packets[cmd == P_BITMAP]++;
3641 c.bytes[cmd == P_BITMAP] += sizeof(struct p_header80) + data_size;
3646 if (!drbd_recv_header(mdev, &cmd, &data_size))
3648 } while (ret == OK);
3652 INFO_bm_xfer_stats(mdev, "receive", &c);
3654 if (mdev->state.conn == C_WF_BITMAP_T) {
3655 ok = !drbd_send_bitmap(mdev);
3658 /* Omit CS_ORDERED with this state transition to avoid deadlocks. */
3659 ok = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
3660 D_ASSERT(ok == SS_SUCCESS);
3661 } else if (mdev->state.conn != C_WF_BITMAP_S) {
3662 /* admin may have requested C_DISCONNECTING,
3663 * other threads may have noticed network errors */
3664 dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n",
3665 drbd_conn_str(mdev->state.conn));
3670 drbd_bm_unlock(mdev);
3671 if (ok && mdev->state.conn == C_WF_BITMAP_S)
3672 drbd_start_resync(mdev, C_SYNC_SOURCE);
3673 free_page((unsigned long) buffer);
3677 static int receive_skip(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3679 /* TODO zero copy sink :) */
3680 static char sink[128];
3683 dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n",
3688 want = min_t(int, size, sizeof(sink));
3689 r = drbd_recv(mdev, sink, want);
3690 ERR_IF(r <= 0) break;
3696 static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3698 if (mdev->state.disk >= D_INCONSISTENT)
3701 /* Make sure we've acked all the TCP data associated
3702 * with the data requests being unplugged */
3703 drbd_tcp_quickack(mdev->data.socket);
3708 typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, enum drbd_packets cmd, unsigned int to_receive);
3713 drbd_cmd_handler_f function;
3716 static struct data_cmd drbd_cmd_handler[] = {
3717 [P_DATA] = { 1, sizeof(struct p_data), receive_Data },
3718 [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply },
3719 [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } ,
3720 [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } ,
3721 [P_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } ,
3722 [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } ,
3723 [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header80), receive_UnplugRemote },
3724 [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
3725 [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
3726 [P_SYNC_PARAM] = { 1, sizeof(struct p_header80), receive_SyncParam },
3727 [P_SYNC_PARAM89] = { 1, sizeof(struct p_header80), receive_SyncParam },
3728 [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol },
3729 [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids },
3730 [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes },
3731 [P_STATE] = { 0, sizeof(struct p_state), receive_state },
3732 [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state },
3733 [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid },
3734 [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
3735 [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest },
3736 [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest },
3737 [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip },
3738 /* anything missing from this table is in
3739 * the asender_tbl, see get_asender_cmd */
3740 [P_MAX_CMD] = { 0, 0, NULL },
3743 /* All handler functions that expect a sub-header get that sub-heder in
3744 mdev->data.rbuf.header.head.payload.
3746 Usually in mdev->data.rbuf.header.head the callback can find the usual
3747 p_header, but they may not rely on that. Since there is also p_header95 !
3750 static void drbdd(struct drbd_conf *mdev)
3752 union p_header *header = &mdev->data.rbuf.header;
3753 unsigned int packet_size;
3754 enum drbd_packets cmd;
3755 size_t shs; /* sub header size */
3758 while (get_t_state(&mdev->receiver) == Running) {
3759 drbd_thread_current_set_cpu(mdev);
3760 if (!drbd_recv_header(mdev, &cmd, &packet_size))
3763 if (unlikely(cmd >= P_MAX_CMD || !drbd_cmd_handler[cmd].function)) {
3764 dev_err(DEV, "unknown packet type %d, l: %d!\n", cmd, packet_size);
3768 shs = drbd_cmd_handler[cmd].pkt_size - sizeof(union p_header);
3769 rv = drbd_recv(mdev, &header->h80.payload, shs);
3770 if (unlikely(rv != shs)) {
3771 dev_err(DEV, "short read while reading sub header: rv=%d\n", rv);
3775 if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) {
3776 dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size);
3780 rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs);
3782 if (unlikely(!rv)) {
3783 dev_err(DEV, "error receiving %s, l: %d!\n",
3784 cmdname(cmd), packet_size);
3791 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
3795 void drbd_flush_workqueue(struct drbd_conf *mdev)
3797 struct drbd_wq_barrier barr;
3799 barr.w.cb = w_prev_work_done;
3800 init_completion(&barr.done);
3801 drbd_queue_work(&mdev->data.work, &barr.w);
3802 wait_for_completion(&barr.done);
3805 void drbd_free_tl_hash(struct drbd_conf *mdev)
3807 struct hlist_head *h;
3809 spin_lock_irq(&mdev->req_lock);
3811 if (!mdev->tl_hash || mdev->state.conn != C_STANDALONE) {
3812 spin_unlock_irq(&mdev->req_lock);
3816 for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++)
3818 dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n",
3819 (int)(h - mdev->ee_hash), h->first);
3820 kfree(mdev->ee_hash);
3821 mdev->ee_hash = NULL;
3822 mdev->ee_hash_s = 0;
3825 for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++)
3827 dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n",
3828 (int)(h - mdev->tl_hash), h->first);
3829 kfree(mdev->tl_hash);
3830 mdev->tl_hash = NULL;
3831 mdev->tl_hash_s = 0;
3832 spin_unlock_irq(&mdev->req_lock);
3835 static void drbd_disconnect(struct drbd_conf *mdev)
3837 enum drbd_fencing_p fp;
3838 union drbd_state os, ns;
3839 int rv = SS_UNKNOWN_ERROR;
3842 if (mdev->state.conn == C_STANDALONE)
3844 if (mdev->state.conn >= C_WF_CONNECTION)
3845 dev_err(DEV, "ASSERT FAILED cstate = %s, expected < WFConnection\n",
3846 drbd_conn_str(mdev->state.conn));
3848 /* asender does not clean up anything. it must not interfere, either */
3849 drbd_thread_stop(&mdev->asender);
3850 drbd_free_sock(mdev);
3852 /* wait for current activity to cease. */
3853 spin_lock_irq(&mdev->req_lock);
3854 _drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
3855 _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee);
3856 _drbd_wait_ee_list_empty(mdev, &mdev->read_ee);
3857 spin_unlock_irq(&mdev->req_lock);
3859 /* We do not have data structures that would allow us to
3860 * get the rs_pending_cnt down to 0 again.
3861 * * On C_SYNC_TARGET we do not have any data structures describing
3862 * the pending RSDataRequest's we have sent.
3863 * * On C_SYNC_SOURCE there is no data structure that tracks
3864 * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget.
3865 * And no, it is not the sum of the reference counts in the
3866 * resync_LRU. The resync_LRU tracks the whole operation including
3867 * the disk-IO, while the rs_pending_cnt only tracks the blocks
3869 drbd_rs_cancel_all(mdev);
3871 mdev->rs_failed = 0;
3872 atomic_set(&mdev->rs_pending_cnt, 0);
3873 wake_up(&mdev->misc_wait);
3875 /* make sure syncer is stopped and w_resume_next_sg queued */
3876 del_timer_sync(&mdev->resync_timer);
3877 resync_timer_fn((unsigned long)mdev);
3879 /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier,
3880 * w_make_resync_request etc. which may still be on the worker queue
3881 * to be "canceled" */
3882 drbd_flush_workqueue(mdev);
3884 /* This also does reclaim_net_ee(). If we do this too early, we might
3885 * miss some resync ee and pages.*/
3886 drbd_process_done_ee(mdev);
3888 kfree(mdev->p_uuid);
3889 mdev->p_uuid = NULL;
3891 if (!is_susp(mdev->state))
3894 dev_info(DEV, "Connection closed\n");
3899 if (get_ldev(mdev)) {
3900 fp = mdev->ldev->dc.fencing;
3904 if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN)
3905 drbd_try_outdate_peer_async(mdev);
3907 spin_lock_irq(&mdev->req_lock);
3909 if (os.conn >= C_UNCONNECTED) {
3910 /* Do not restart in case we are C_DISCONNECTING */
3912 ns.conn = C_UNCONNECTED;
3913 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
3915 spin_unlock_irq(&mdev->req_lock);
3917 if (os.conn == C_DISCONNECTING) {
3918 wait_event(mdev->net_cnt_wait, atomic_read(&mdev->net_cnt) == 0);
3920 if (!is_susp(mdev->state)) {
3921 /* we must not free the tl_hash
3922 * while application io is still on the fly */
3923 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
3924 drbd_free_tl_hash(mdev);
3927 crypto_free_hash(mdev->cram_hmac_tfm);
3928 mdev->cram_hmac_tfm = NULL;
3930 kfree(mdev->net_conf);
3931 mdev->net_conf = NULL;
3932 drbd_request_state(mdev, NS(conn, C_STANDALONE));
3935 /* tcp_close and release of sendpage pages can be deferred. I don't
3936 * want to use SO_LINGER, because apparently it can be deferred for
3937 * more than 20 seconds (longest time I checked).
3939 * Actually we don't care for exactly when the network stack does its
3940 * put_page(), but release our reference on these pages right here.
3942 i = drbd_release_ee(mdev, &mdev->net_ee);
3944 dev_info(DEV, "net_ee not empty, killed %u entries\n", i);
3945 i = atomic_read(&mdev->pp_in_use_by_net);
3947 dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i);
3948 i = atomic_read(&mdev->pp_in_use);
3950 dev_info(DEV, "pp_in_use = %d, expected 0\n", i);
3952 D_ASSERT(list_empty(&mdev->read_ee));
3953 D_ASSERT(list_empty(&mdev->active_ee));
3954 D_ASSERT(list_empty(&mdev->sync_ee));
3955 D_ASSERT(list_empty(&mdev->done_ee));
3957 /* ok, no more ee's on the fly, it is safe to reset the epoch_size */
3958 atomic_set(&mdev->current_epoch->epoch_size, 0);
3959 D_ASSERT(list_empty(&mdev->current_epoch->list));
3963 * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version
3964 * we can agree on is stored in agreed_pro_version.
3966 * feature flags and the reserved array should be enough room for future
3967 * enhancements of the handshake protocol, and possible plugins...
3969 * for now, they are expected to be zero, but ignored.
3971 static int drbd_send_handshake(struct drbd_conf *mdev)
3973 /* ASSERT current == mdev->receiver ... */
3974 struct p_handshake *p = &mdev->data.sbuf.handshake;
3977 if (mutex_lock_interruptible(&mdev->data.mutex)) {
3978 dev_err(DEV, "interrupted during initial handshake\n");
3979 return 0; /* interrupted. not ok. */
3982 if (mdev->data.socket == NULL) {
3983 mutex_unlock(&mdev->data.mutex);
3987 memset(p, 0, sizeof(*p));
3988 p->protocol_min = cpu_to_be32(PRO_VERSION_MIN);
3989 p->protocol_max = cpu_to_be32(PRO_VERSION_MAX);
3990 ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE,
3991 (struct p_header80 *)p, sizeof(*p), 0 );
3992 mutex_unlock(&mdev->data.mutex);
3998 * 1 yes, we have a valid connection
3999 * 0 oops, did not work out, please try again
4000 * -1 peer talks different language,
4001 * no point in trying again, please go standalone.
4003 static int drbd_do_handshake(struct drbd_conf *mdev)
4005 /* ASSERT current == mdev->receiver ... */
4006 struct p_handshake *p = &mdev->data.rbuf.handshake;
4007 const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80);
4008 unsigned int length;
4009 enum drbd_packets cmd;
4012 rv = drbd_send_handshake(mdev);
4016 rv = drbd_recv_header(mdev, &cmd, &length);
4020 if (cmd != P_HAND_SHAKE) {
4021 dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n",
4026 if (length != expect) {
4027 dev_err(DEV, "expected HandShake length: %u, received: %u\n",
4032 rv = drbd_recv(mdev, &p->head.payload, expect);
4035 dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv);
4039 p->protocol_min = be32_to_cpu(p->protocol_min);
4040 p->protocol_max = be32_to_cpu(p->protocol_max);
4041 if (p->protocol_max == 0)
4042 p->protocol_max = p->protocol_min;
4044 if (PRO_VERSION_MAX < p->protocol_min ||
4045 PRO_VERSION_MIN > p->protocol_max)
4048 mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max);
4050 dev_info(DEV, "Handshake successful: "
4051 "Agreed network protocol version %d\n", mdev->agreed_pro_version);
4056 dev_err(DEV, "incompatible DRBD dialects: "
4057 "I support %d-%d, peer supports %d-%d\n",
4058 PRO_VERSION_MIN, PRO_VERSION_MAX,
4059 p->protocol_min, p->protocol_max);
4063 #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE)
4064 static int drbd_do_auth(struct drbd_conf *mdev)
4066 dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n");
4067 dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n");
4071 #define CHALLENGE_LEN 64
4075 0 - failed, try again (network error),
4076 -1 - auth failed, don't try again.
4079 static int drbd_do_auth(struct drbd_conf *mdev)
4081 char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */
4082 struct scatterlist sg;
4083 char *response = NULL;
4084 char *right_response = NULL;
4085 char *peers_ch = NULL;
4086 unsigned int key_len = strlen(mdev->net_conf->shared_secret);
4087 unsigned int resp_size;
4088 struct hash_desc desc;
4089 enum drbd_packets cmd;
4090 unsigned int length;
4093 desc.tfm = mdev->cram_hmac_tfm;
4096 rv = crypto_hash_setkey(mdev->cram_hmac_tfm,
4097 (u8 *)mdev->net_conf->shared_secret, key_len);
4099 dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv);
4104 get_random_bytes(my_challenge, CHALLENGE_LEN);
4106 rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN);
4110 rv = drbd_recv_header(mdev, &cmd, &length);
4114 if (cmd != P_AUTH_CHALLENGE) {
4115 dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n",
4121 if (length > CHALLENGE_LEN * 2) {
4122 dev_err(DEV, "expected AuthChallenge payload too big.\n");
4127 peers_ch = kmalloc(length, GFP_NOIO);
4128 if (peers_ch == NULL) {
4129 dev_err(DEV, "kmalloc of peers_ch failed\n");
4134 rv = drbd_recv(mdev, peers_ch, length);
4137 dev_err(DEV, "short read AuthChallenge: l=%u\n", rv);
4142 resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm);
4143 response = kmalloc(resp_size, GFP_NOIO);
4144 if (response == NULL) {
4145 dev_err(DEV, "kmalloc of response failed\n");
4150 sg_init_table(&sg, 1);
4151 sg_set_buf(&sg, peers_ch, length);
4153 rv = crypto_hash_digest(&desc, &sg, sg.length, response);
4155 dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
4160 rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size);
4164 rv = drbd_recv_header(mdev, &cmd, &length);
4168 if (cmd != P_AUTH_RESPONSE) {
4169 dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n",
4175 if (length != resp_size) {
4176 dev_err(DEV, "expected AuthResponse payload of wrong size\n");
4181 rv = drbd_recv(mdev, response , resp_size);
4183 if (rv != resp_size) {
4184 dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv);
4189 right_response = kmalloc(resp_size, GFP_NOIO);
4190 if (right_response == NULL) {
4191 dev_err(DEV, "kmalloc of right_response failed\n");
4196 sg_set_buf(&sg, my_challenge, CHALLENGE_LEN);
4198 rv = crypto_hash_digest(&desc, &sg, sg.length, right_response);
4200 dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
4205 rv = !memcmp(response, right_response, resp_size);
4208 dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n",
4209 resp_size, mdev->net_conf->cram_hmac_alg);
4216 kfree(right_response);
4222 int drbdd_init(struct drbd_thread *thi)
4224 struct drbd_conf *mdev = thi->mdev;
4225 unsigned int minor = mdev_to_minor(mdev);
4228 sprintf(current->comm, "drbd%d_receiver", minor);
4230 dev_info(DEV, "receiver (re)started\n");
4233 h = drbd_connect(mdev);
4235 drbd_disconnect(mdev);
4236 __set_current_state(TASK_INTERRUPTIBLE);
4237 schedule_timeout(HZ);
4240 dev_warn(DEV, "Discarding network configuration.\n");
4241 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
4246 if (get_net_conf(mdev)) {
4252 drbd_disconnect(mdev);
4254 dev_info(DEV, "receiver terminated\n");
4258 /* ********* acknowledge sender ******** */
4260 static int got_RqSReply(struct drbd_conf *mdev, struct p_header80 *h)
4262 struct p_req_state_reply *p = (struct p_req_state_reply *)h;
4264 int retcode = be32_to_cpu(p->retcode);
4266 if (retcode >= SS_SUCCESS) {
4267 set_bit(CL_ST_CHG_SUCCESS, &mdev->flags);
4269 set_bit(CL_ST_CHG_FAIL, &mdev->flags);
4270 dev_err(DEV, "Requested state change failed by peer: %s (%d)\n",
4271 drbd_set_st_err_str(retcode), retcode);
4273 wake_up(&mdev->state_wait);
4278 static int got_Ping(struct drbd_conf *mdev, struct p_header80 *h)
4280 return drbd_send_ping_ack(mdev);
4284 static int got_PingAck(struct drbd_conf *mdev, struct p_header80 *h)
4286 /* restore idle timeout */
4287 mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ;
4288 if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags))
4289 wake_up(&mdev->misc_wait);
4294 static int got_IsInSync(struct drbd_conf *mdev, struct p_header80 *h)
4296 struct p_block_ack *p = (struct p_block_ack *)h;
4297 sector_t sector = be64_to_cpu(p->sector);
4298 int blksize = be32_to_cpu(p->blksize);
4300 D_ASSERT(mdev->agreed_pro_version >= 89);
4302 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4304 if (get_ldev(mdev)) {
4305 drbd_rs_complete_io(mdev, sector);
4306 drbd_set_in_sync(mdev, sector, blksize);
4307 /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */
4308 mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT);
4311 dec_rs_pending(mdev);
4312 atomic_add(blksize >> 9, &mdev->rs_sect_in);
4317 /* when we receive the ACK for a write request,
4318 * verify that we actually know about it */
4319 static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev,
4320 u64 id, sector_t sector)
4322 struct hlist_head *slot = tl_hash_slot(mdev, sector);
4323 struct hlist_node *n;
4324 struct drbd_request *req;
4326 hlist_for_each_entry(req, n, slot, colision) {
4327 if ((unsigned long)req == (unsigned long)id) {
4328 if (req->sector != sector) {
4329 dev_err(DEV, "_ack_id_to_req: found req %p but it has "
4330 "wrong sector (%llus versus %llus)\n", req,
4331 (unsigned long long)req->sector,
4332 (unsigned long long)sector);
4338 dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n",
4339 (void *)(unsigned long)id, (unsigned long long)sector);
4343 typedef struct drbd_request *(req_validator_fn)
4344 (struct drbd_conf *mdev, u64 id, sector_t sector);
4346 static int validate_req_change_req_state(struct drbd_conf *mdev,
4347 u64 id, sector_t sector, req_validator_fn validator,
4348 const char *func, enum drbd_req_event what)
4350 struct drbd_request *req;
4351 struct bio_and_error m;
4353 spin_lock_irq(&mdev->req_lock);
4354 req = validator(mdev, id, sector);
4355 if (unlikely(!req)) {
4356 spin_unlock_irq(&mdev->req_lock);
4357 dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func);
4360 __req_mod(req, what, &m);
4361 spin_unlock_irq(&mdev->req_lock);
4364 complete_master_bio(mdev, &m);
4368 static int got_BlockAck(struct drbd_conf *mdev, struct p_header80 *h)
4370 struct p_block_ack *p = (struct p_block_ack *)h;
4371 sector_t sector = be64_to_cpu(p->sector);
4372 int blksize = be32_to_cpu(p->blksize);
4373 enum drbd_req_event what;
4375 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4377 if (is_syncer_block_id(p->block_id)) {
4378 drbd_set_in_sync(mdev, sector, blksize);
4379 dec_rs_pending(mdev);
4382 switch (be16_to_cpu(h->command)) {
4383 case P_RS_WRITE_ACK:
4384 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4385 what = write_acked_by_peer_and_sis;
4388 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4389 what = write_acked_by_peer;
4392 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B);
4393 what = recv_acked_by_peer;
4396 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4397 what = conflict_discarded_by_peer;
4404 return validate_req_change_req_state(mdev, p->block_id, sector,
4405 _ack_id_to_req, __func__ , what);
4408 static int got_NegAck(struct drbd_conf *mdev, struct p_header80 *h)
4410 struct p_block_ack *p = (struct p_block_ack *)h;
4411 sector_t sector = be64_to_cpu(p->sector);
4413 if (__ratelimit(&drbd_ratelimit_state))
4414 dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n");
4416 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4418 if (is_syncer_block_id(p->block_id)) {
4419 int size = be32_to_cpu(p->blksize);
4420 dec_rs_pending(mdev);
4421 drbd_rs_failed_io(mdev, sector, size);
4424 return validate_req_change_req_state(mdev, p->block_id, sector,
4425 _ack_id_to_req, __func__ , neg_acked);
4428 static int got_NegDReply(struct drbd_conf *mdev, struct p_header80 *h)
4430 struct p_block_ack *p = (struct p_block_ack *)h;
4431 sector_t sector = be64_to_cpu(p->sector);
4433 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4434 dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n",
4435 (unsigned long long)sector, be32_to_cpu(p->blksize));
4437 return validate_req_change_req_state(mdev, p->block_id, sector,
4438 _ar_id_to_req, __func__ , neg_acked);
4441 static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header80 *h)
4445 struct p_block_ack *p = (struct p_block_ack *)h;
4447 sector = be64_to_cpu(p->sector);
4448 size = be32_to_cpu(p->blksize);
4450 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4452 dec_rs_pending(mdev);
4454 if (get_ldev_if_state(mdev, D_FAILED)) {
4455 drbd_rs_complete_io(mdev, sector);
4456 drbd_rs_failed_io(mdev, sector, size);
4463 static int got_BarrierAck(struct drbd_conf *mdev, struct p_header80 *h)
4465 struct p_barrier_ack *p = (struct p_barrier_ack *)h;
4467 tl_release(mdev, p->barrier, be32_to_cpu(p->set_size));
4472 static int got_OVResult(struct drbd_conf *mdev, struct p_header80 *h)
4474 struct p_block_ack *p = (struct p_block_ack *)h;
4475 struct drbd_work *w;
4479 sector = be64_to_cpu(p->sector);
4480 size = be32_to_cpu(p->blksize);
4482 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4484 if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC)
4485 drbd_ov_oos_found(mdev, sector, size);
4489 if (!get_ldev(mdev))
4492 drbd_rs_complete_io(mdev, sector);
4493 dec_rs_pending(mdev);
4495 if (--mdev->ov_left == 0) {
4496 w = kmalloc(sizeof(*w), GFP_NOIO);
4498 w->cb = w_ov_finished;
4499 drbd_queue_work_front(&mdev->data.work, w);
4501 dev_err(DEV, "kmalloc(w) failed.");
4503 drbd_resync_finished(mdev);
4510 static int got_skip(struct drbd_conf *mdev, struct p_header80 *h)
4515 struct asender_cmd {
4517 int (*process)(struct drbd_conf *mdev, struct p_header80 *h);
4520 static struct asender_cmd *get_asender_cmd(int cmd)
4522 static struct asender_cmd asender_tbl[] = {
4523 /* anything missing from this table is in
4524 * the drbd_cmd_handler (drbd_default_handler) table,
4525 * see the beginning of drbdd() */
4526 [P_PING] = { sizeof(struct p_header80), got_Ping },
4527 [P_PING_ACK] = { sizeof(struct p_header80), got_PingAck },
4528 [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4529 [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4530 [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4531 [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4532 [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck },
4533 [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply },
4534 [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply},
4535 [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult },
4536 [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck },
4537 [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply },
4538 [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync },
4539 [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip },
4540 [P_MAX_CMD] = { 0, NULL },
4542 if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL)
4544 return &asender_tbl[cmd];
4547 int drbd_asender(struct drbd_thread *thi)
4549 struct drbd_conf *mdev = thi->mdev;
4550 struct p_header80 *h = &mdev->meta.rbuf.header.h80;
4551 struct asender_cmd *cmd = NULL;
4556 int expect = sizeof(struct p_header80);
4559 sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev));
4561 current->policy = SCHED_RR; /* Make this a realtime task! */
4562 current->rt_priority = 2; /* more important than all other tasks */
4564 while (get_t_state(thi) == Running) {
4565 drbd_thread_current_set_cpu(mdev);
4566 if (test_and_clear_bit(SEND_PING, &mdev->flags)) {
4567 ERR_IF(!drbd_send_ping(mdev)) goto reconnect;
4568 mdev->meta.socket->sk->sk_rcvtimeo =
4569 mdev->net_conf->ping_timeo*HZ/10;
4572 /* conditionally cork;
4573 * it may hurt latency if we cork without much to send */
4574 if (!mdev->net_conf->no_cork &&
4575 3 < atomic_read(&mdev->unacked_cnt))
4576 drbd_tcp_cork(mdev->meta.socket);
4578 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4579 flush_signals(current);
4580 if (!drbd_process_done_ee(mdev)) {
4581 dev_err(DEV, "process_done_ee() = NOT_OK\n");
4584 /* to avoid race with newly queued ACKs */
4585 set_bit(SIGNAL_ASENDER, &mdev->flags);
4586 spin_lock_irq(&mdev->req_lock);
4587 empty = list_empty(&mdev->done_ee);
4588 spin_unlock_irq(&mdev->req_lock);
4589 /* new ack may have been queued right here,
4590 * but then there is also a signal pending,
4591 * and we start over... */
4595 /* but unconditionally uncork unless disabled */
4596 if (!mdev->net_conf->no_cork)
4597 drbd_tcp_uncork(mdev->meta.socket);
4599 /* short circuit, recv_msg would return EINTR anyways. */
4600 if (signal_pending(current))
4603 rv = drbd_recv_short(mdev, mdev->meta.socket,
4604 buf, expect-received, 0);
4605 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4607 flush_signals(current);
4610 * -EINTR (on meta) we got a signal
4611 * -EAGAIN (on meta) rcvtimeo expired
4612 * -ECONNRESET other side closed the connection
4613 * -ERESTARTSYS (on data) we got a signal
4614 * rv < 0 other than above: unexpected error!
4615 * rv == expected: full header or command
4616 * rv < expected: "woken" by signal during receive
4617 * rv == 0 : "connection shut down by peer"
4619 if (likely(rv > 0)) {
4622 } else if (rv == 0) {
4623 dev_err(DEV, "meta connection shut down by peer.\n");
4625 } else if (rv == -EAGAIN) {
4626 if (mdev->meta.socket->sk->sk_rcvtimeo ==
4627 mdev->net_conf->ping_timeo*HZ/10) {
4628 dev_err(DEV, "PingAck did not arrive in time.\n");
4631 set_bit(SEND_PING, &mdev->flags);
4633 } else if (rv == -EINTR) {
4636 dev_err(DEV, "sock_recvmsg returned %d\n", rv);
4640 if (received == expect && cmd == NULL) {
4641 if (unlikely(h->magic != BE_DRBD_MAGIC)) {
4642 dev_err(DEV, "magic?? on meta m: 0x%08x c: %d l: %d\n",
4643 be32_to_cpu(h->magic),
4644 be16_to_cpu(h->command),
4645 be16_to_cpu(h->length));
4648 cmd = get_asender_cmd(be16_to_cpu(h->command));
4649 len = be16_to_cpu(h->length);
4650 if (unlikely(cmd == NULL)) {
4651 dev_err(DEV, "unknown command?? on meta m: 0x%08x c: %d l: %d\n",
4652 be32_to_cpu(h->magic),
4653 be16_to_cpu(h->command),
4654 be16_to_cpu(h->length));
4657 expect = cmd->pkt_size;
4658 ERR_IF(len != expect-sizeof(struct p_header80))
4661 if (received == expect) {
4662 D_ASSERT(cmd != NULL);
4663 if (!cmd->process(mdev, h))
4668 expect = sizeof(struct p_header80);
4675 drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE));
4679 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
4681 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4683 D_ASSERT(mdev->state.conn < C_CONNECTED);
4684 dev_info(DEV, "asender terminated\n");