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/pkt_sched.h>
40 #define __KERNEL_SYSCALLS__
41 #include <linux/unistd.h>
42 #include <linux/vmalloc.h>
43 #include <linux/random.h>
44 #include <linux/string.h>
45 #include <linux/scatterlist.h>
57 static int drbd_do_handshake(struct drbd_conf *mdev);
58 static int drbd_do_auth(struct drbd_conf *mdev);
60 static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event);
61 static int e_end_block(struct drbd_conf *, struct drbd_work *, int);
64 #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN)
67 * some helper functions to deal with single linked page lists,
68 * page->private being our "next" pointer.
71 /* If at least n pages are linked at head, get n pages off.
72 * Otherwise, don't modify head, and return NULL.
73 * Locking is the responsibility of the caller.
75 static struct page *page_chain_del(struct page **head, int n)
89 tmp = page_chain_next(page);
91 break; /* found sufficient pages */
93 /* insufficient pages, don't use any of them. */
98 /* add end of list marker for the returned list */
99 set_page_private(page, 0);
100 /* actual return value, and adjustment of head */
106 /* may be used outside of locks to find the tail of a (usually short)
107 * "private" page chain, before adding it back to a global chain head
108 * with page_chain_add() under a spinlock. */
109 static struct page *page_chain_tail(struct page *page, int *len)
113 while ((tmp = page_chain_next(page)))
120 static int page_chain_free(struct page *page)
124 page_chain_for_each_safe(page, tmp) {
131 static void page_chain_add(struct page **head,
132 struct page *chain_first, struct page *chain_last)
136 tmp = page_chain_tail(chain_first, NULL);
137 BUG_ON(tmp != chain_last);
140 /* add chain to head */
141 set_page_private(chain_last, (unsigned long)*head);
145 static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number)
147 struct page *page = NULL;
148 struct page *tmp = NULL;
151 /* Yes, testing drbd_pp_vacant outside the lock is racy.
152 * So what. It saves a spin_lock. */
153 if (drbd_pp_vacant >= number) {
154 spin_lock(&drbd_pp_lock);
155 page = page_chain_del(&drbd_pp_pool, number);
157 drbd_pp_vacant -= number;
158 spin_unlock(&drbd_pp_lock);
163 /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD
164 * "criss-cross" setup, that might cause write-out on some other DRBD,
165 * which in turn might block on the other node at this very place. */
166 for (i = 0; i < number; i++) {
167 tmp = alloc_page(GFP_TRY);
170 set_page_private(tmp, (unsigned long)page);
177 /* Not enough pages immediately available this time.
178 * No need to jump around here, drbd_pp_alloc will retry this
179 * function "soon". */
181 tmp = page_chain_tail(page, NULL);
182 spin_lock(&drbd_pp_lock);
183 page_chain_add(&drbd_pp_pool, page, tmp);
185 spin_unlock(&drbd_pp_lock);
190 static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed)
192 struct drbd_epoch_entry *e;
193 struct list_head *le, *tle;
195 /* The EEs are always appended to the end of the list. Since
196 they are sent in order over the wire, they have to finish
197 in order. As soon as we see the first not finished we can
198 stop to examine the list... */
200 list_for_each_safe(le, tle, &mdev->net_ee) {
201 e = list_entry(le, struct drbd_epoch_entry, w.list);
202 if (drbd_ee_has_active_page(e))
204 list_move(le, to_be_freed);
208 static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev)
210 LIST_HEAD(reclaimed);
211 struct drbd_epoch_entry *e, *t;
213 spin_lock_irq(&mdev->req_lock);
214 reclaim_net_ee(mdev, &reclaimed);
215 spin_unlock_irq(&mdev->req_lock);
217 list_for_each_entry_safe(e, t, &reclaimed, w.list)
218 drbd_free_net_ee(mdev, e);
222 * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled)
223 * @mdev: DRBD device.
224 * @number: number of pages requested
225 * @retry: whether to retry, if not enough pages are available right now
227 * Tries to allocate number pages, first from our own page pool, then from
228 * the kernel, unless this allocation would exceed the max_buffers setting.
229 * Possibly retry until DRBD frees sufficient pages somewhere else.
231 * Returns a page chain linked via page->private.
233 static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry)
235 struct page *page = NULL;
238 /* Yes, we may run up to @number over max_buffers. If we
239 * follow it strictly, the admin will get it wrong anyways. */
240 if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers)
241 page = drbd_pp_first_pages_or_try_alloc(mdev, number);
243 while (page == NULL) {
244 prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE);
246 drbd_kick_lo_and_reclaim_net(mdev);
248 if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) {
249 page = drbd_pp_first_pages_or_try_alloc(mdev, number);
257 if (signal_pending(current)) {
258 dev_warn(DEV, "drbd_pp_alloc interrupted!\n");
264 finish_wait(&drbd_pp_wait, &wait);
267 atomic_add(number, &mdev->pp_in_use);
271 /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc.
272 * Is also used from inside an other spin_lock_irq(&mdev->req_lock);
273 * Either links the page chain back to the global pool,
274 * or returns all pages to the system. */
275 static void drbd_pp_free(struct drbd_conf *mdev, struct page *page, int is_net)
277 atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use;
280 if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE)*minor_count)
281 i = page_chain_free(page);
284 tmp = page_chain_tail(page, &i);
285 spin_lock(&drbd_pp_lock);
286 page_chain_add(&drbd_pp_pool, page, tmp);
288 spin_unlock(&drbd_pp_lock);
290 i = atomic_sub_return(i, a);
292 dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n",
293 is_net ? "pp_in_use_by_net" : "pp_in_use", i);
294 wake_up(&drbd_pp_wait);
298 You need to hold the req_lock:
299 _drbd_wait_ee_list_empty()
301 You must not have the req_lock:
307 drbd_process_done_ee()
309 drbd_wait_ee_list_empty()
312 struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev,
315 unsigned int data_size,
316 gfp_t gfp_mask) __must_hold(local)
318 struct drbd_epoch_entry *e;
320 unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT;
322 if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE))
325 e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM);
327 if (!(gfp_mask & __GFP_NOWARN))
328 dev_err(DEV, "alloc_ee: Allocation of an EE failed\n");
332 page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT));
336 drbd_clear_interval(&e->i);
340 atomic_set(&e->pending_bios, 0);
341 e->i.size = data_size;
343 e->i.sector = sector;
345 * The block_id is opaque to the receiver. It is not endianness
346 * converted, and sent back to the sender unchanged.
353 mempool_free(e, drbd_ee_mempool);
357 void drbd_free_some_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, int is_net)
359 if (e->flags & EE_HAS_DIGEST)
361 drbd_pp_free(mdev, e->pages, is_net);
362 D_ASSERT(atomic_read(&e->pending_bios) == 0);
363 D_ASSERT(drbd_interval_empty(&e->i));
364 mempool_free(e, drbd_ee_mempool);
367 int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list)
369 LIST_HEAD(work_list);
370 struct drbd_epoch_entry *e, *t;
372 int is_net = list == &mdev->net_ee;
374 spin_lock_irq(&mdev->req_lock);
375 list_splice_init(list, &work_list);
376 spin_unlock_irq(&mdev->req_lock);
378 list_for_each_entry_safe(e, t, &work_list, w.list) {
379 drbd_free_some_ee(mdev, e, is_net);
387 * This function is called from _asender only_
388 * but see also comments in _req_mod(,BARRIER_ACKED)
389 * and receive_Barrier.
391 * Move entries from net_ee to done_ee, if ready.
392 * Grab done_ee, call all callbacks, free the entries.
393 * The callbacks typically send out ACKs.
395 static int drbd_process_done_ee(struct drbd_conf *mdev)
397 LIST_HEAD(work_list);
398 LIST_HEAD(reclaimed);
399 struct drbd_epoch_entry *e, *t;
400 int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS);
402 spin_lock_irq(&mdev->req_lock);
403 reclaim_net_ee(mdev, &reclaimed);
404 list_splice_init(&mdev->done_ee, &work_list);
405 spin_unlock_irq(&mdev->req_lock);
407 list_for_each_entry_safe(e, t, &reclaimed, w.list)
408 drbd_free_net_ee(mdev, e);
410 /* possible callbacks here:
411 * e_end_block, and e_end_resync_block, e_send_discard_ack.
412 * all ignore the last argument.
414 list_for_each_entry_safe(e, t, &work_list, w.list) {
415 /* list_del not necessary, next/prev members not touched */
416 ok = e->w.cb(mdev, &e->w, !ok) && ok;
417 drbd_free_ee(mdev, e);
419 wake_up(&mdev->ee_wait);
424 void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head)
428 /* avoids spin_lock/unlock
429 * and calling prepare_to_wait in the fast path */
430 while (!list_empty(head)) {
431 prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE);
432 spin_unlock_irq(&mdev->req_lock);
434 finish_wait(&mdev->ee_wait, &wait);
435 spin_lock_irq(&mdev->req_lock);
439 void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head)
441 spin_lock_irq(&mdev->req_lock);
442 _drbd_wait_ee_list_empty(mdev, head);
443 spin_unlock_irq(&mdev->req_lock);
446 /* see also kernel_accept; which is only present since 2.6.18.
447 * also we want to log which part of it failed, exactly */
448 static int drbd_accept(struct drbd_conf *mdev, const char **what,
449 struct socket *sock, struct socket **newsock)
451 struct sock *sk = sock->sk;
455 err = sock->ops->listen(sock, 5);
459 *what = "sock_create_lite";
460 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
466 err = sock->ops->accept(sock, *newsock, 0);
468 sock_release(*newsock);
472 (*newsock)->ops = sock->ops;
478 static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock,
479 void *buf, size_t size, int flags)
486 struct msghdr msg = {
488 .msg_iov = (struct iovec *)&iov,
489 .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL)
495 rv = sock_recvmsg(sock, &msg, size, msg.msg_flags);
501 static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size)
508 struct msghdr msg = {
510 .msg_iov = (struct iovec *)&iov,
511 .msg_flags = MSG_WAITALL | MSG_NOSIGNAL
519 rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags);
524 * ECONNRESET other side closed the connection
525 * ERESTARTSYS (on sock) we got a signal
529 if (rv == -ECONNRESET)
530 dev_info(DEV, "sock was reset by peer\n");
531 else if (rv != -ERESTARTSYS)
532 dev_err(DEV, "sock_recvmsg returned %d\n", rv);
534 } else if (rv == 0) {
535 dev_info(DEV, "sock was shut down by peer\n");
538 /* signal came in, or peer/link went down,
539 * after we read a partial message
541 /* D_ASSERT(signal_pending(current)); */
549 drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
555 * On individual connections, the socket buffer size must be set prior to the
556 * listen(2) or connect(2) calls in order to have it take effect.
557 * This is our wrapper to do so.
559 static void drbd_setbufsize(struct socket *sock, unsigned int snd,
562 /* open coded SO_SNDBUF, SO_RCVBUF */
564 sock->sk->sk_sndbuf = snd;
565 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
568 sock->sk->sk_rcvbuf = rcv;
569 sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
573 static struct socket *drbd_try_connect(struct drbd_conf *mdev)
577 struct sockaddr_in6 src_in6;
579 int disconnect_on_error = 1;
581 if (!get_net_conf(mdev))
584 what = "sock_create_kern";
585 err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family,
586 SOCK_STREAM, IPPROTO_TCP, &sock);
592 sock->sk->sk_rcvtimeo =
593 sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ;
594 drbd_setbufsize(sock, mdev->net_conf->sndbuf_size,
595 mdev->net_conf->rcvbuf_size);
597 /* explicitly bind to the configured IP as source IP
598 * for the outgoing connections.
599 * This is needed for multihomed hosts and to be
600 * able to use lo: interfaces for drbd.
601 * Make sure to use 0 as port number, so linux selects
602 * a free one dynamically.
604 memcpy(&src_in6, mdev->net_conf->my_addr,
605 min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6)));
606 if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6)
607 src_in6.sin6_port = 0;
609 ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */
611 what = "bind before connect";
612 err = sock->ops->bind(sock,
613 (struct sockaddr *) &src_in6,
614 mdev->net_conf->my_addr_len);
618 /* connect may fail, peer not yet available.
619 * stay C_WF_CONNECTION, don't go Disconnecting! */
620 disconnect_on_error = 0;
622 err = sock->ops->connect(sock,
623 (struct sockaddr *)mdev->net_conf->peer_addr,
624 mdev->net_conf->peer_addr_len, 0);
633 /* timeout, busy, signal pending */
634 case ETIMEDOUT: case EAGAIN: case EINPROGRESS:
635 case EINTR: case ERESTARTSYS:
636 /* peer not (yet) available, network problem */
637 case ECONNREFUSED: case ENETUNREACH:
638 case EHOSTDOWN: case EHOSTUNREACH:
639 disconnect_on_error = 0;
642 dev_err(DEV, "%s failed, err = %d\n", what, err);
644 if (disconnect_on_error)
645 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
651 static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev)
654 struct socket *s_estab = NULL, *s_listen;
657 if (!get_net_conf(mdev))
660 what = "sock_create_kern";
661 err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family,
662 SOCK_STREAM, IPPROTO_TCP, &s_listen);
668 timeo = mdev->net_conf->try_connect_int * HZ;
669 timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */
671 s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */
672 s_listen->sk->sk_rcvtimeo = timeo;
673 s_listen->sk->sk_sndtimeo = timeo;
674 drbd_setbufsize(s_listen, mdev->net_conf->sndbuf_size,
675 mdev->net_conf->rcvbuf_size);
677 what = "bind before listen";
678 err = s_listen->ops->bind(s_listen,
679 (struct sockaddr *) mdev->net_conf->my_addr,
680 mdev->net_conf->my_addr_len);
684 err = drbd_accept(mdev, &what, s_listen, &s_estab);
688 sock_release(s_listen);
690 if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) {
691 dev_err(DEV, "%s failed, err = %d\n", what, err);
692 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
700 static int drbd_send_fp(struct drbd_conf *mdev,
701 struct socket *sock, enum drbd_packets cmd)
703 struct p_header80 *h = &mdev->data.sbuf.header.h80;
705 return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0);
708 static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock)
710 struct p_header80 *h = &mdev->data.rbuf.header.h80;
713 rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0);
715 if (rr == sizeof(*h) && h->magic == cpu_to_be32(DRBD_MAGIC))
716 return be16_to_cpu(h->command);
722 * drbd_socket_okay() - Free the socket if its connection is not okay
723 * @mdev: DRBD device.
724 * @sock: pointer to the pointer to the socket.
726 static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock)
734 rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK);
736 if (rr > 0 || rr == -EAGAIN) {
747 * 1 yes, we have a valid connection
748 * 0 oops, did not work out, please try again
749 * -1 peer talks different language,
750 * no point in trying again, please go standalone.
751 * -2 We do not have a network config...
753 static int drbd_connect(struct drbd_conf *mdev)
755 struct socket *s, *sock, *msock;
758 D_ASSERT(!mdev->data.socket);
760 if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS)
763 clear_bit(DISCARD_CONCURRENT, &mdev->flags);
770 /* 3 tries, this should take less than a second! */
771 s = drbd_try_connect(mdev);
774 /* give the other side time to call bind() & listen() */
775 schedule_timeout_interruptible(HZ / 10);
780 drbd_send_fp(mdev, s, P_HAND_SHAKE_S);
784 drbd_send_fp(mdev, s, P_HAND_SHAKE_M);
788 dev_err(DEV, "Logic error in drbd_connect()\n");
789 goto out_release_sockets;
794 schedule_timeout_interruptible(mdev->net_conf->ping_timeo*HZ/10);
795 ok = drbd_socket_okay(mdev, &sock);
796 ok = drbd_socket_okay(mdev, &msock) && ok;
802 s = drbd_wait_for_connect(mdev);
804 try = drbd_recv_fp(mdev, s);
805 drbd_socket_okay(mdev, &sock);
806 drbd_socket_okay(mdev, &msock);
810 dev_warn(DEV, "initial packet S crossed\n");
817 dev_warn(DEV, "initial packet M crossed\n");
821 set_bit(DISCARD_CONCURRENT, &mdev->flags);
824 dev_warn(DEV, "Error receiving initial packet\n");
831 if (mdev->state.conn <= C_DISCONNECTING)
832 goto out_release_sockets;
833 if (signal_pending(current)) {
834 flush_signals(current);
836 if (get_t_state(&mdev->receiver) == Exiting)
837 goto out_release_sockets;
841 ok = drbd_socket_okay(mdev, &sock);
842 ok = drbd_socket_okay(mdev, &msock) && ok;
848 msock->sk->sk_reuse = 1; /* SO_REUSEADDR */
849 sock->sk->sk_reuse = 1; /* SO_REUSEADDR */
851 sock->sk->sk_allocation = GFP_NOIO;
852 msock->sk->sk_allocation = GFP_NOIO;
854 sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK;
855 msock->sk->sk_priority = TC_PRIO_INTERACTIVE;
858 * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
859 * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
860 * first set it to the P_HAND_SHAKE timeout,
861 * which we set to 4x the configured ping_timeout. */
862 sock->sk->sk_sndtimeo =
863 sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10;
865 msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
866 msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ;
868 /* we don't want delays.
869 * we use TCP_CORK where appropriate, though */
870 drbd_tcp_nodelay(sock);
871 drbd_tcp_nodelay(msock);
873 mdev->data.socket = sock;
874 mdev->meta.socket = msock;
875 mdev->last_received = jiffies;
877 D_ASSERT(mdev->asender.task == NULL);
879 h = drbd_do_handshake(mdev);
883 if (mdev->cram_hmac_tfm) {
884 /* drbd_request_state(mdev, NS(conn, WFAuth)); */
885 switch (drbd_do_auth(mdev)) {
887 dev_err(DEV, "Authentication of peer failed\n");
890 dev_err(DEV, "Authentication of peer failed, trying again.\n");
895 if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS)
898 sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
899 sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
901 atomic_set(&mdev->packet_seq, 0);
904 drbd_thread_start(&mdev->asender);
906 if (drbd_send_protocol(mdev) == -1)
908 drbd_send_sync_param(mdev, &mdev->sync_conf);
909 drbd_send_sizes(mdev, 0, 0);
910 drbd_send_uuids(mdev);
911 drbd_send_state(mdev);
912 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
913 clear_bit(RESIZE_PENDING, &mdev->flags);
914 mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */
926 static int drbd_recv_header(struct drbd_conf *mdev, enum drbd_packets *cmd, unsigned int *packet_size)
928 union p_header *h = &mdev->data.rbuf.header;
931 r = drbd_recv(mdev, h, sizeof(*h));
932 if (unlikely(r != sizeof(*h))) {
933 if (!signal_pending(current))
934 dev_warn(DEV, "short read expecting header on sock: r=%d\n", r);
938 if (likely(h->h80.magic == cpu_to_be32(DRBD_MAGIC))) {
939 *cmd = be16_to_cpu(h->h80.command);
940 *packet_size = be16_to_cpu(h->h80.length);
941 } else if (h->h95.magic == cpu_to_be16(DRBD_MAGIC_BIG)) {
942 *cmd = be16_to_cpu(h->h95.command);
943 *packet_size = be32_to_cpu(h->h95.length);
945 dev_err(DEV, "magic?? on data m: 0x%08x c: %d l: %d\n",
946 be32_to_cpu(h->h80.magic),
947 be16_to_cpu(h->h80.command),
948 be16_to_cpu(h->h80.length));
951 mdev->last_received = jiffies;
956 static void drbd_flush(struct drbd_conf *mdev)
960 if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) {
961 rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL,
964 dev_err(DEV, "local disk flush failed with status %d\n", rv);
965 /* would rather check on EOPNOTSUPP, but that is not reliable.
966 * don't try again for ANY return value != 0
967 * if (rv == -EOPNOTSUPP) */
968 drbd_bump_write_ordering(mdev, WO_drain_io);
975 * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it.
976 * @mdev: DRBD device.
977 * @epoch: Epoch object.
980 static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
981 struct drbd_epoch *epoch,
985 struct drbd_epoch *next_epoch;
986 enum finish_epoch rv = FE_STILL_LIVE;
988 spin_lock(&mdev->epoch_lock);
992 epoch_size = atomic_read(&epoch->epoch_size);
994 switch (ev & ~EV_CLEANUP) {
996 atomic_dec(&epoch->active);
998 case EV_GOT_BARRIER_NR:
999 set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags);
1001 case EV_BECAME_LAST:
1006 if (epoch_size != 0 &&
1007 atomic_read(&epoch->active) == 0 &&
1008 test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) {
1009 if (!(ev & EV_CLEANUP)) {
1010 spin_unlock(&mdev->epoch_lock);
1011 drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size);
1012 spin_lock(&mdev->epoch_lock);
1016 if (mdev->current_epoch != epoch) {
1017 next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list);
1018 list_del(&epoch->list);
1019 ev = EV_BECAME_LAST | (ev & EV_CLEANUP);
1023 if (rv == FE_STILL_LIVE)
1027 atomic_set(&epoch->epoch_size, 0);
1028 /* atomic_set(&epoch->active, 0); is already zero */
1029 if (rv == FE_STILL_LIVE)
1031 wake_up(&mdev->ee_wait);
1041 spin_unlock(&mdev->epoch_lock);
1047 * drbd_bump_write_ordering() - Fall back to an other write ordering method
1048 * @mdev: DRBD device.
1049 * @wo: Write ordering method to try.
1051 void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local)
1053 enum write_ordering_e pwo;
1054 static char *write_ordering_str[] = {
1056 [WO_drain_io] = "drain",
1057 [WO_bdev_flush] = "flush",
1060 pwo = mdev->write_ordering;
1062 if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush)
1064 if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain)
1066 mdev->write_ordering = wo;
1067 if (pwo != mdev->write_ordering || wo == WO_bdev_flush)
1068 dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]);
1073 * @mdev: DRBD device.
1075 * @rw: flag field, see bio->bi_rw
1077 * May spread the pages to multiple bios,
1078 * depending on bio_add_page restrictions.
1080 * Returns 0 if all bios have been submitted,
1081 * -ENOMEM if we could not allocate enough bios,
1082 * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a
1083 * single page to an empty bio (which should never happen and likely indicates
1084 * that the lower level IO stack is in some way broken). This has been observed
1085 * on certain Xen deployments.
1087 /* TODO allocate from our own bio_set. */
1088 int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e,
1089 const unsigned rw, const int fault_type)
1091 struct bio *bios = NULL;
1093 struct page *page = e->pages;
1094 sector_t sector = e->i.sector;
1095 unsigned ds = e->i.size;
1096 unsigned n_bios = 0;
1097 unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT;
1100 /* In most cases, we will only need one bio. But in case the lower
1101 * level restrictions happen to be different at this offset on this
1102 * side than those of the sending peer, we may need to submit the
1103 * request in more than one bio. */
1105 bio = bio_alloc(GFP_NOIO, nr_pages);
1107 dev_err(DEV, "submit_ee: Allocation of a bio failed\n");
1110 /* > e->i.sector, unless this is the first bio */
1111 bio->bi_sector = sector;
1112 bio->bi_bdev = mdev->ldev->backing_bdev;
1114 bio->bi_private = e;
1115 bio->bi_end_io = drbd_endio_sec;
1117 bio->bi_next = bios;
1121 page_chain_for_each(page) {
1122 unsigned len = min_t(unsigned, ds, PAGE_SIZE);
1123 if (!bio_add_page(bio, page, len, 0)) {
1124 /* A single page must always be possible!
1125 * But in case it fails anyways,
1126 * we deal with it, and complain (below). */
1127 if (bio->bi_vcnt == 0) {
1129 "bio_add_page failed for len=%u, "
1130 "bi_vcnt=0 (bi_sector=%llu)\n",
1131 len, (unsigned long long)bio->bi_sector);
1141 D_ASSERT(page == NULL);
1144 atomic_set(&e->pending_bios, n_bios);
1147 bios = bios->bi_next;
1148 bio->bi_next = NULL;
1150 drbd_generic_make_request(mdev, fault_type, bio);
1157 bios = bios->bi_next;
1163 static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
1166 struct p_barrier *p = &mdev->data.rbuf.barrier;
1167 struct drbd_epoch *epoch;
1171 mdev->current_epoch->barrier_nr = p->barrier;
1172 rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR);
1174 /* P_BARRIER_ACK may imply that the corresponding extent is dropped from
1175 * the activity log, which means it would not be resynced in case the
1176 * R_PRIMARY crashes now.
1177 * Therefore we must send the barrier_ack after the barrier request was
1179 switch (mdev->write_ordering) {
1181 if (rv == FE_RECYCLED)
1184 /* receiver context, in the writeout path of the other node.
1185 * avoid potential distributed deadlock */
1186 epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
1190 dev_warn(DEV, "Allocation of an epoch failed, slowing down\n");
1195 drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
1198 if (atomic_read(&mdev->current_epoch->epoch_size)) {
1199 epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
1204 epoch = mdev->current_epoch;
1205 wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0);
1207 D_ASSERT(atomic_read(&epoch->active) == 0);
1208 D_ASSERT(epoch->flags == 0);
1212 dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering);
1217 atomic_set(&epoch->epoch_size, 0);
1218 atomic_set(&epoch->active, 0);
1220 spin_lock(&mdev->epoch_lock);
1221 if (atomic_read(&mdev->current_epoch->epoch_size)) {
1222 list_add(&epoch->list, &mdev->current_epoch->list);
1223 mdev->current_epoch = epoch;
1226 /* The current_epoch got recycled while we allocated this one... */
1229 spin_unlock(&mdev->epoch_lock);
1234 /* used from receive_RSDataReply (recv_resync_read)
1235 * and from receive_Data */
1236 static struct drbd_epoch_entry *
1237 read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local)
1239 const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
1240 struct drbd_epoch_entry *e;
1243 void *dig_in = mdev->int_dig_in;
1244 void *dig_vv = mdev->int_dig_vv;
1245 unsigned long *data;
1247 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
1248 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
1251 rr = drbd_recv(mdev, dig_in, dgs);
1253 if (!signal_pending(current))
1255 "short read receiving data digest: read %d expected %d\n",
1263 ERR_IF(data_size == 0) return NULL;
1264 ERR_IF(data_size & 0x1ff) return NULL;
1265 ERR_IF(data_size > DRBD_MAX_BIO_SIZE) return NULL;
1267 /* even though we trust out peer,
1268 * we sometimes have to double check. */
1269 if (sector + (data_size>>9) > capacity) {
1270 dev_err(DEV, "request from peer beyond end of local disk: "
1271 "capacity: %llus < sector: %llus + size: %u\n",
1272 (unsigned long long)capacity,
1273 (unsigned long long)sector, data_size);
1277 /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
1278 * "criss-cross" setup, that might cause write-out on some other DRBD,
1279 * which in turn might block on the other node at this very place. */
1280 e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO);
1286 page_chain_for_each(page) {
1287 unsigned len = min_t(int, ds, PAGE_SIZE);
1289 rr = drbd_recv(mdev, data, len);
1290 if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) {
1291 dev_err(DEV, "Fault injection: Corrupting data on receive\n");
1292 data[0] = data[0] ^ (unsigned long)-1;
1296 drbd_free_ee(mdev, e);
1297 if (!signal_pending(current))
1298 dev_warn(DEV, "short read receiving data: read %d expected %d\n",
1306 drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv);
1307 if (memcmp(dig_in, dig_vv, dgs)) {
1308 dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n",
1309 (unsigned long long)sector, data_size);
1310 drbd_bcast_ee(mdev, "digest failed",
1311 dgs, dig_in, dig_vv, e);
1312 drbd_free_ee(mdev, e);
1316 mdev->recv_cnt += data_size>>9;
1320 /* drbd_drain_block() just takes a data block
1321 * out of the socket input buffer, and discards it.
1323 static int drbd_drain_block(struct drbd_conf *mdev, int data_size)
1332 page = drbd_pp_alloc(mdev, 1, 1);
1336 rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE));
1337 if (rr != min_t(int, data_size, PAGE_SIZE)) {
1339 if (!signal_pending(current))
1341 "short read receiving data: read %d expected %d\n",
1342 rr, min_t(int, data_size, PAGE_SIZE));
1348 drbd_pp_free(mdev, page, 0);
1352 static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req,
1353 sector_t sector, int data_size)
1355 struct bio_vec *bvec;
1357 int dgs, rr, i, expect;
1358 void *dig_in = mdev->int_dig_in;
1359 void *dig_vv = mdev->int_dig_vv;
1361 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
1362 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
1365 rr = drbd_recv(mdev, dig_in, dgs);
1367 if (!signal_pending(current))
1369 "short read receiving data reply digest: read %d expected %d\n",
1377 /* optimistically update recv_cnt. if receiving fails below,
1378 * we disconnect anyways, and counters will be reset. */
1379 mdev->recv_cnt += data_size>>9;
1381 bio = req->master_bio;
1382 D_ASSERT(sector == bio->bi_sector);
1384 bio_for_each_segment(bvec, bio, i) {
1385 expect = min_t(int, data_size, bvec->bv_len);
1386 rr = drbd_recv(mdev,
1387 kmap(bvec->bv_page)+bvec->bv_offset,
1389 kunmap(bvec->bv_page);
1391 if (!signal_pending(current))
1392 dev_warn(DEV, "short read receiving data reply: "
1393 "read %d expected %d\n",
1401 drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv);
1402 if (memcmp(dig_in, dig_vv, dgs)) {
1403 dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n");
1408 D_ASSERT(data_size == 0);
1412 /* e_end_resync_block() is called via
1413 * drbd_process_done_ee() by asender only */
1414 static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1416 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1417 sector_t sector = e->i.sector;
1420 D_ASSERT(drbd_interval_empty(&e->i));
1422 if (likely((e->flags & EE_WAS_ERROR) == 0)) {
1423 drbd_set_in_sync(mdev, sector, e->i.size);
1424 ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e);
1426 /* Record failure to sync */
1427 drbd_rs_failed_io(mdev, sector, e->i.size);
1429 ok = drbd_send_ack(mdev, P_NEG_ACK, e);
1436 static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local)
1438 struct drbd_epoch_entry *e;
1440 e = read_in_block(mdev, ID_SYNCER, sector, data_size);
1444 dec_rs_pending(mdev);
1447 /* corresponding dec_unacked() in e_end_resync_block()
1448 * respective _drbd_clear_done_ee */
1450 e->w.cb = e_end_resync_block;
1452 spin_lock_irq(&mdev->req_lock);
1453 list_add(&e->w.list, &mdev->sync_ee);
1454 spin_unlock_irq(&mdev->req_lock);
1456 atomic_add(data_size >> 9, &mdev->rs_sect_ev);
1457 if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0)
1460 /* don't care for the reason here */
1461 dev_err(DEV, "submit failed, triggering re-connect\n");
1462 spin_lock_irq(&mdev->req_lock);
1463 list_del(&e->w.list);
1464 spin_unlock_irq(&mdev->req_lock);
1466 drbd_free_ee(mdev, e);
1472 static struct drbd_request *
1473 find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id,
1474 sector_t sector, bool missing_ok, const char *func)
1476 struct drbd_request *req;
1478 /* Request object according to our peer */
1479 req = (struct drbd_request *)(unsigned long)id;
1480 if (drbd_contains_interval(root, sector, &req->i))
1483 dev_err(DEV, "%s: failed to find request %lu, sector %llus\n", func,
1484 (unsigned long)id, (unsigned long long)sector);
1489 static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
1491 struct drbd_request *req;
1494 struct p_data *p = &mdev->data.rbuf.data;
1496 sector = be64_to_cpu(p->sector);
1498 spin_lock_irq(&mdev->req_lock);
1499 req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__);
1500 spin_unlock_irq(&mdev->req_lock);
1504 /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid
1505 * special casing it there for the various failure cases.
1506 * still no race with drbd_fail_pending_reads */
1507 ok = recv_dless_read(mdev, req, sector, data_size);
1510 req_mod(req, DATA_RECEIVED);
1511 /* else: nothing. handled from drbd_disconnect...
1512 * I don't think we may complete this just yet
1513 * in case we are "on-disconnect: freeze" */
1518 static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
1522 struct p_data *p = &mdev->data.rbuf.data;
1524 sector = be64_to_cpu(p->sector);
1525 D_ASSERT(p->block_id == ID_SYNCER);
1527 if (get_ldev(mdev)) {
1528 /* data is submitted to disk within recv_resync_read.
1529 * corresponding put_ldev done below on error,
1530 * or in drbd_endio_sec. */
1531 ok = recv_resync_read(mdev, sector, data_size);
1533 if (__ratelimit(&drbd_ratelimit_state))
1534 dev_err(DEV, "Can not write resync data to local disk.\n");
1536 ok = drbd_drain_block(mdev, data_size);
1538 drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size);
1541 atomic_add(data_size >> 9, &mdev->rs_sect_in);
1546 /* e_end_block() is called via drbd_process_done_ee().
1547 * this means this function only runs in the asender thread
1549 static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
1551 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1552 sector_t sector = e->i.sector;
1555 if (mdev->net_conf->wire_protocol == DRBD_PROT_C) {
1556 if (likely((e->flags & EE_WAS_ERROR) == 0)) {
1557 pcmd = (mdev->state.conn >= C_SYNC_SOURCE &&
1558 mdev->state.conn <= C_PAUSED_SYNC_T &&
1559 e->flags & EE_MAY_SET_IN_SYNC) ?
1560 P_RS_WRITE_ACK : P_WRITE_ACK;
1561 ok &= drbd_send_ack(mdev, pcmd, e);
1562 if (pcmd == P_RS_WRITE_ACK)
1563 drbd_set_in_sync(mdev, sector, e->i.size);
1565 ok = drbd_send_ack(mdev, P_NEG_ACK, e);
1566 /* we expect it to be marked out of sync anyways...
1567 * maybe assert this? */
1571 /* we delete from the conflict detection hash _after_ we sent out the
1572 * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */
1573 if (mdev->net_conf->two_primaries) {
1574 spin_lock_irq(&mdev->req_lock);
1575 D_ASSERT(!drbd_interval_empty(&e->i));
1576 drbd_remove_interval(&mdev->epoch_entries, &e->i);
1577 drbd_clear_interval(&e->i);
1578 spin_unlock_irq(&mdev->req_lock);
1580 D_ASSERT(drbd_interval_empty(&e->i));
1582 drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0));
1587 static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1589 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1592 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
1593 ok = drbd_send_ack(mdev, P_DISCARD_ACK, e);
1595 spin_lock_irq(&mdev->req_lock);
1596 D_ASSERT(!drbd_interval_empty(&e->i));
1597 drbd_remove_interval(&mdev->epoch_entries, &e->i);
1598 drbd_clear_interval(&e->i);
1599 spin_unlock_irq(&mdev->req_lock);
1606 /* Called from receive_Data.
1607 * Synchronize packets on sock with packets on msock.
1609 * This is here so even when a P_DATA packet traveling via sock overtook an Ack
1610 * packet traveling on msock, they are still processed in the order they have
1613 * Note: we don't care for Ack packets overtaking P_DATA packets.
1615 * In case packet_seq is larger than mdev->peer_seq number, there are
1616 * outstanding packets on the msock. We wait for them to arrive.
1617 * In case we are the logically next packet, we update mdev->peer_seq
1618 * ourselves. Correctly handles 32bit wrap around.
1620 * Assume we have a 10 GBit connection, that is about 1<<30 byte per second,
1621 * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds
1622 * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have
1623 * 1<<9 == 512 seconds aka ages for the 32bit wrap around...
1625 * returns 0 if we may process the packet,
1626 * -ERESTARTSYS if we were interrupted (by disconnect signal). */
1627 static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq)
1633 spin_lock(&mdev->peer_seq_lock);
1635 prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE);
1636 if (seq_le(packet_seq, mdev->peer_seq+1))
1638 if (signal_pending(current)) {
1642 p_seq = mdev->peer_seq;
1643 spin_unlock(&mdev->peer_seq_lock);
1644 timeout = schedule_timeout(30*HZ);
1645 spin_lock(&mdev->peer_seq_lock);
1646 if (timeout == 0 && p_seq == mdev->peer_seq) {
1648 dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n");
1652 finish_wait(&mdev->seq_wait, &wait);
1653 if (mdev->peer_seq+1 == packet_seq)
1655 spin_unlock(&mdev->peer_seq_lock);
1659 /* see also bio_flags_to_wire()
1660 * DRBD_REQ_*, because we need to semantically map the flags to data packet
1661 * flags and back. We may replicate to other kernel versions. */
1662 static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf)
1664 return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) |
1665 (dpf & DP_FUA ? REQ_FUA : 0) |
1666 (dpf & DP_FLUSH ? REQ_FLUSH : 0) |
1667 (dpf & DP_DISCARD ? REQ_DISCARD : 0);
1670 /* mirrored write */
1671 static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
1674 struct drbd_epoch_entry *e;
1675 struct p_data *p = &mdev->data.rbuf.data;
1679 if (!get_ldev(mdev)) {
1680 spin_lock(&mdev->peer_seq_lock);
1681 if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num))
1683 spin_unlock(&mdev->peer_seq_lock);
1685 drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size);
1686 atomic_inc(&mdev->current_epoch->epoch_size);
1687 return drbd_drain_block(mdev, data_size);
1690 /* get_ldev(mdev) successful.
1691 * Corresponding put_ldev done either below (on various errors),
1692 * or in drbd_endio_sec, if we successfully submit the data at
1693 * the end of this function. */
1695 sector = be64_to_cpu(p->sector);
1696 e = read_in_block(mdev, p->block_id, sector, data_size);
1702 e->w.cb = e_end_block;
1704 dp_flags = be32_to_cpu(p->dp_flags);
1705 rw |= wire_flags_to_bio(mdev, dp_flags);
1707 if (dp_flags & DP_MAY_SET_IN_SYNC)
1708 e->flags |= EE_MAY_SET_IN_SYNC;
1710 spin_lock(&mdev->epoch_lock);
1711 e->epoch = mdev->current_epoch;
1712 atomic_inc(&e->epoch->epoch_size);
1713 atomic_inc(&e->epoch->active);
1714 spin_unlock(&mdev->epoch_lock);
1716 /* I'm the receiver, I do hold a net_cnt reference. */
1717 if (!mdev->net_conf->two_primaries) {
1718 spin_lock_irq(&mdev->req_lock);
1720 /* don't get the req_lock yet,
1721 * we may sleep in drbd_wait_peer_seq */
1722 const int size = e->i.size;
1723 const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1727 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
1729 /* conflict detection and handling:
1730 * 1. wait on the sequence number,
1731 * in case this data packet overtook ACK packets.
1732 * 2. check our interval trees for conflicting requests:
1733 * we only need to check the write_requests tree; the
1734 * epoch_entries tree cannot contain any overlaps because
1735 * they were already eliminated on the submitting node.
1737 * Note: for two_primaries, we are protocol C,
1738 * so there cannot be any request that is DONE
1739 * but still on the transfer log.
1741 * unconditionally add to the epoch_entries tree.
1743 * if no conflicting request is found:
1746 * if any conflicting request is found
1747 * that has not yet been acked,
1748 * AND I have the "discard concurrent writes" flag:
1749 * queue (via done_ee) the P_DISCARD_ACK; OUT.
1751 * if any conflicting request is found:
1752 * block the receiver, waiting on misc_wait
1753 * until no more conflicting requests are there,
1754 * or we get interrupted (disconnect).
1756 * we do not just write after local io completion of those
1757 * requests, but only after req is done completely, i.e.
1758 * we wait for the P_DISCARD_ACK to arrive!
1760 * then proceed normally, i.e. submit.
1762 if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num)))
1763 goto out_interrupted;
1765 spin_lock_irq(&mdev->req_lock);
1767 drbd_insert_interval(&mdev->epoch_entries, &e->i);
1771 struct drbd_interval *i;
1772 int have_unacked = 0;
1773 int have_conflict = 0;
1774 prepare_to_wait(&mdev->misc_wait, &wait,
1775 TASK_INTERRUPTIBLE);
1777 i = drbd_find_overlap(&mdev->write_requests, sector, size);
1779 struct drbd_request *req2 =
1780 container_of(i, struct drbd_request, i);
1782 /* only ALERT on first iteration,
1783 * we may be woken up early... */
1785 dev_alert(DEV, "%s[%u] Concurrent local write detected!"
1786 " new: %llus +%u; pending: %llus +%u\n",
1787 current->comm, current->pid,
1788 (unsigned long long)sector, size,
1789 (unsigned long long)req2->i.sector, req2->i.size);
1790 if (req2->rq_state & RQ_NET_PENDING)
1797 /* Discard Ack only for the _first_ iteration */
1798 if (first && discard && have_unacked) {
1799 dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n",
1800 (unsigned long long)sector);
1802 e->w.cb = e_send_discard_ack;
1803 list_add_tail(&e->w.list, &mdev->done_ee);
1805 spin_unlock_irq(&mdev->req_lock);
1807 /* we could probably send that P_DISCARD_ACK ourselves,
1808 * but I don't like the receiver using the msock */
1812 finish_wait(&mdev->misc_wait, &wait);
1816 if (signal_pending(current)) {
1817 drbd_remove_interval(&mdev->epoch_entries, &e->i);
1818 drbd_clear_interval(&e->i);
1820 spin_unlock_irq(&mdev->req_lock);
1822 finish_wait(&mdev->misc_wait, &wait);
1823 goto out_interrupted;
1826 spin_unlock_irq(&mdev->req_lock);
1829 dev_alert(DEV, "Concurrent write! [W AFTERWARDS] "
1830 "sec=%llus\n", (unsigned long long)sector);
1831 } else if (discard) {
1832 /* we had none on the first iteration.
1833 * there must be none now. */
1834 D_ASSERT(have_unacked == 0);
1837 spin_lock_irq(&mdev->req_lock);
1839 finish_wait(&mdev->misc_wait, &wait);
1842 list_add(&e->w.list, &mdev->active_ee);
1843 spin_unlock_irq(&mdev->req_lock);
1845 switch (mdev->net_conf->wire_protocol) {
1848 /* corresponding dec_unacked() in e_end_block()
1849 * respective _drbd_clear_done_ee */
1852 /* I really don't like it that the receiver thread
1853 * sends on the msock, but anyways */
1854 drbd_send_ack(mdev, P_RECV_ACK, e);
1861 if (mdev->state.pdsk < D_INCONSISTENT) {
1862 /* In case we have the only disk of the cluster, */
1863 drbd_set_out_of_sync(mdev, e->i.sector, e->i.size);
1864 e->flags |= EE_CALL_AL_COMPLETE_IO;
1865 e->flags &= ~EE_MAY_SET_IN_SYNC;
1866 drbd_al_begin_io(mdev, e->i.sector);
1869 if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0)
1872 /* don't care for the reason here */
1873 dev_err(DEV, "submit failed, triggering re-connect\n");
1874 spin_lock_irq(&mdev->req_lock);
1875 list_del(&e->w.list);
1876 drbd_remove_interval(&mdev->epoch_entries, &e->i);
1877 drbd_clear_interval(&e->i);
1878 spin_unlock_irq(&mdev->req_lock);
1879 if (e->flags & EE_CALL_AL_COMPLETE_IO)
1880 drbd_al_complete_io(mdev, e->i.sector);
1883 drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + EV_CLEANUP);
1885 drbd_free_ee(mdev, e);
1889 /* We may throttle resync, if the lower device seems to be busy,
1890 * and current sync rate is above c_min_rate.
1892 * To decide whether or not the lower device is busy, we use a scheme similar
1893 * to MD RAID is_mddev_idle(): if the partition stats reveal "significant"
1894 * (more than 64 sectors) of activity we cannot account for with our own resync
1895 * activity, it obviously is "busy".
1897 * The current sync rate used here uses only the most recent two step marks,
1898 * to have a short time average so we can react faster.
1900 int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector)
1902 struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk;
1903 unsigned long db, dt, dbdt;
1904 struct lc_element *tmp;
1908 /* feature disabled? */
1909 if (mdev->sync_conf.c_min_rate == 0)
1912 spin_lock_irq(&mdev->al_lock);
1913 tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector));
1915 struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce);
1916 if (test_bit(BME_PRIORITY, &bm_ext->flags)) {
1917 spin_unlock_irq(&mdev->al_lock);
1920 /* Do not slow down if app IO is already waiting for this extent */
1922 spin_unlock_irq(&mdev->al_lock);
1924 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
1925 (int)part_stat_read(&disk->part0, sectors[1]) -
1926 atomic_read(&mdev->rs_sect_ev);
1928 if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) {
1929 unsigned long rs_left;
1932 mdev->rs_last_events = curr_events;
1934 /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP,
1936 i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;
1938 if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T)
1939 rs_left = mdev->ov_left;
1941 rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed;
1943 dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ;
1946 db = mdev->rs_mark_left[i] - rs_left;
1947 dbdt = Bit2KB(db/dt);
1949 if (dbdt > mdev->sync_conf.c_min_rate)
1956 static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int digest_size)
1959 const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
1960 struct drbd_epoch_entry *e;
1961 struct digest_info *di = NULL;
1963 unsigned int fault_type;
1964 struct p_block_req *p = &mdev->data.rbuf.block_req;
1966 sector = be64_to_cpu(p->sector);
1967 size = be32_to_cpu(p->blksize);
1969 if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) {
1970 dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
1971 (unsigned long long)sector, size);
1974 if (sector + (size>>9) > capacity) {
1975 dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
1976 (unsigned long long)sector, size);
1980 if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) {
1983 case P_DATA_REQUEST:
1984 drbd_send_ack_rp(mdev, P_NEG_DREPLY, p);
1986 case P_RS_DATA_REQUEST:
1987 case P_CSUM_RS_REQUEST:
1989 drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p);
1993 dec_rs_pending(mdev);
1994 drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC);
1997 dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n",
2000 if (verb && __ratelimit(&drbd_ratelimit_state))
2001 dev_err(DEV, "Can not satisfy peer's read request, "
2002 "no local data.\n");
2004 /* drain possibly payload */
2005 return drbd_drain_block(mdev, digest_size);
2008 /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
2009 * "criss-cross" setup, that might cause write-out on some other DRBD,
2010 * which in turn might block on the other node at this very place. */
2011 e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO);
2018 case P_DATA_REQUEST:
2019 e->w.cb = w_e_end_data_req;
2020 fault_type = DRBD_FAULT_DT_RD;
2021 /* application IO, don't drbd_rs_begin_io */
2024 case P_RS_DATA_REQUEST:
2025 e->w.cb = w_e_end_rsdata_req;
2026 fault_type = DRBD_FAULT_RS_RD;
2027 /* used in the sector offset progress display */
2028 mdev->bm_resync_fo = BM_SECT_TO_BIT(sector);
2032 case P_CSUM_RS_REQUEST:
2033 fault_type = DRBD_FAULT_RS_RD;
2034 di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO);
2038 di->digest_size = digest_size;
2039 di->digest = (((char *)di)+sizeof(struct digest_info));
2042 e->flags |= EE_HAS_DIGEST;
2044 if (drbd_recv(mdev, di->digest, digest_size) != digest_size)
2047 if (cmd == P_CSUM_RS_REQUEST) {
2048 D_ASSERT(mdev->agreed_pro_version >= 89);
2049 e->w.cb = w_e_end_csum_rs_req;
2050 /* used in the sector offset progress display */
2051 mdev->bm_resync_fo = BM_SECT_TO_BIT(sector);
2052 } else if (cmd == P_OV_REPLY) {
2053 /* track progress, we may need to throttle */
2054 atomic_add(size >> 9, &mdev->rs_sect_in);
2055 e->w.cb = w_e_end_ov_reply;
2056 dec_rs_pending(mdev);
2057 /* drbd_rs_begin_io done when we sent this request,
2058 * but accounting still needs to be done. */
2059 goto submit_for_resync;
2064 if (mdev->ov_start_sector == ~(sector_t)0 &&
2065 mdev->agreed_pro_version >= 90) {
2066 unsigned long now = jiffies;
2068 mdev->ov_start_sector = sector;
2069 mdev->ov_position = sector;
2070 mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector);
2071 mdev->rs_total = mdev->ov_left;
2072 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
2073 mdev->rs_mark_left[i] = mdev->ov_left;
2074 mdev->rs_mark_time[i] = now;
2076 dev_info(DEV, "Online Verify start sector: %llu\n",
2077 (unsigned long long)sector);
2079 e->w.cb = w_e_end_ov_req;
2080 fault_type = DRBD_FAULT_RS_RD;
2084 dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n",
2086 fault_type = DRBD_FAULT_MAX;
2090 /* Throttle, drbd_rs_begin_io and submit should become asynchronous
2091 * wrt the receiver, but it is not as straightforward as it may seem.
2092 * Various places in the resync start and stop logic assume resync
2093 * requests are processed in order, requeuing this on the worker thread
2094 * introduces a bunch of new code for synchronization between threads.
2096 * Unlimited throttling before drbd_rs_begin_io may stall the resync
2097 * "forever", throttling after drbd_rs_begin_io will lock that extent
2098 * for application writes for the same time. For now, just throttle
2099 * here, where the rest of the code expects the receiver to sleep for
2103 /* Throttle before drbd_rs_begin_io, as that locks out application IO;
2104 * this defers syncer requests for some time, before letting at least
2105 * on request through. The resync controller on the receiving side
2106 * will adapt to the incoming rate accordingly.
2108 * We cannot throttle here if remote is Primary/SyncTarget:
2109 * we would also throttle its application reads.
2110 * In that case, throttling is done on the SyncTarget only.
2112 if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector))
2113 schedule_timeout_uninterruptible(HZ/10);
2114 if (drbd_rs_begin_io(mdev, sector))
2118 atomic_add(size >> 9, &mdev->rs_sect_ev);
2122 spin_lock_irq(&mdev->req_lock);
2123 list_add_tail(&e->w.list, &mdev->read_ee);
2124 spin_unlock_irq(&mdev->req_lock);
2126 if (drbd_submit_ee(mdev, e, READ, fault_type) == 0)
2129 /* don't care for the reason here */
2130 dev_err(DEV, "submit failed, triggering re-connect\n");
2131 spin_lock_irq(&mdev->req_lock);
2132 list_del(&e->w.list);
2133 spin_unlock_irq(&mdev->req_lock);
2134 /* no drbd_rs_complete_io(), we are dropping the connection anyways */
2138 drbd_free_ee(mdev, e);
2142 static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local)
2144 int self, peer, rv = -100;
2145 unsigned long ch_self, ch_peer;
2147 self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
2148 peer = mdev->p_uuid[UI_BITMAP] & 1;
2150 ch_peer = mdev->p_uuid[UI_SIZE];
2151 ch_self = mdev->comm_bm_set;
2153 switch (mdev->net_conf->after_sb_0p) {
2155 case ASB_DISCARD_SECONDARY:
2156 case ASB_CALL_HELPER:
2157 dev_err(DEV, "Configuration error.\n");
2159 case ASB_DISCONNECT:
2161 case ASB_DISCARD_YOUNGER_PRI:
2162 if (self == 0 && peer == 1) {
2166 if (self == 1 && peer == 0) {
2170 /* Else fall through to one of the other strategies... */
2171 case ASB_DISCARD_OLDER_PRI:
2172 if (self == 0 && peer == 1) {
2176 if (self == 1 && peer == 0) {
2180 /* Else fall through to one of the other strategies... */
2181 dev_warn(DEV, "Discard younger/older primary did not find a decision\n"
2182 "Using discard-least-changes instead\n");
2183 case ASB_DISCARD_ZERO_CHG:
2184 if (ch_peer == 0 && ch_self == 0) {
2185 rv = test_bit(DISCARD_CONCURRENT, &mdev->flags)
2189 if (ch_peer == 0) { rv = 1; break; }
2190 if (ch_self == 0) { rv = -1; break; }
2192 if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG)
2194 case ASB_DISCARD_LEAST_CHG:
2195 if (ch_self < ch_peer)
2197 else if (ch_self > ch_peer)
2199 else /* ( ch_self == ch_peer ) */
2200 /* Well, then use something else. */
2201 rv = test_bit(DISCARD_CONCURRENT, &mdev->flags)
2204 case ASB_DISCARD_LOCAL:
2207 case ASB_DISCARD_REMOTE:
2214 static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local)
2218 switch (mdev->net_conf->after_sb_1p) {
2219 case ASB_DISCARD_YOUNGER_PRI:
2220 case ASB_DISCARD_OLDER_PRI:
2221 case ASB_DISCARD_LEAST_CHG:
2222 case ASB_DISCARD_LOCAL:
2223 case ASB_DISCARD_REMOTE:
2224 dev_err(DEV, "Configuration error.\n");
2226 case ASB_DISCONNECT:
2229 hg = drbd_asb_recover_0p(mdev);
2230 if (hg == -1 && mdev->state.role == R_SECONDARY)
2232 if (hg == 1 && mdev->state.role == R_PRIMARY)
2236 rv = drbd_asb_recover_0p(mdev);
2238 case ASB_DISCARD_SECONDARY:
2239 return mdev->state.role == R_PRIMARY ? 1 : -1;
2240 case ASB_CALL_HELPER:
2241 hg = drbd_asb_recover_0p(mdev);
2242 if (hg == -1 && mdev->state.role == R_PRIMARY) {
2243 enum drbd_state_rv rv2;
2245 drbd_set_role(mdev, R_SECONDARY, 0);
2246 /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
2247 * we might be here in C_WF_REPORT_PARAMS which is transient.
2248 * we do not need to wait for the after state change work either. */
2249 rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY));
2250 if (rv2 != SS_SUCCESS) {
2251 drbd_khelper(mdev, "pri-lost-after-sb");
2253 dev_warn(DEV, "Successfully gave up primary role.\n");
2263 static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local)
2267 switch (mdev->net_conf->after_sb_2p) {
2268 case ASB_DISCARD_YOUNGER_PRI:
2269 case ASB_DISCARD_OLDER_PRI:
2270 case ASB_DISCARD_LEAST_CHG:
2271 case ASB_DISCARD_LOCAL:
2272 case ASB_DISCARD_REMOTE:
2274 case ASB_DISCARD_SECONDARY:
2275 dev_err(DEV, "Configuration error.\n");
2278 rv = drbd_asb_recover_0p(mdev);
2280 case ASB_DISCONNECT:
2282 case ASB_CALL_HELPER:
2283 hg = drbd_asb_recover_0p(mdev);
2285 enum drbd_state_rv rv2;
2287 /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
2288 * we might be here in C_WF_REPORT_PARAMS which is transient.
2289 * we do not need to wait for the after state change work either. */
2290 rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY));
2291 if (rv2 != SS_SUCCESS) {
2292 drbd_khelper(mdev, "pri-lost-after-sb");
2294 dev_warn(DEV, "Successfully gave up primary role.\n");
2304 static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid,
2305 u64 bits, u64 flags)
2308 dev_info(DEV, "%s uuid info vanished while I was looking!\n", text);
2311 dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n",
2313 (unsigned long long)uuid[UI_CURRENT],
2314 (unsigned long long)uuid[UI_BITMAP],
2315 (unsigned long long)uuid[UI_HISTORY_START],
2316 (unsigned long long)uuid[UI_HISTORY_END],
2317 (unsigned long long)bits,
2318 (unsigned long long)flags);
2322 100 after split brain try auto recover
2323 2 C_SYNC_SOURCE set BitMap
2324 1 C_SYNC_SOURCE use BitMap
2326 -1 C_SYNC_TARGET use BitMap
2327 -2 C_SYNC_TARGET set BitMap
2328 -100 after split brain, disconnect
2329 -1000 unrelated data
2330 -1091 requires proto 91
2331 -1096 requires proto 96
2333 static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local)
2338 self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
2339 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
2342 if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED)
2346 if ((self == UUID_JUST_CREATED || self == (u64)0) &&
2347 peer != UUID_JUST_CREATED)
2351 if (self != UUID_JUST_CREATED &&
2352 (peer == UUID_JUST_CREATED || peer == (u64)0))
2356 int rct, dc; /* roles at crash time */
2358 if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) {
2360 if (mdev->agreed_pro_version < 91)
2363 if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) &&
2364 (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) {
2365 dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n");
2366 drbd_uuid_set_bm(mdev, 0UL);
2368 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid,
2369 mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0);
2372 dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n");
2379 if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) {
2381 if (mdev->agreed_pro_version < 91)
2384 if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) &&
2385 (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) {
2386 dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n");
2388 mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START];
2389 mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP];
2390 mdev->p_uuid[UI_BITMAP] = 0UL;
2392 drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
2395 dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n");
2402 /* Common power [off|failure] */
2403 rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) +
2404 (mdev->p_uuid[UI_FLAGS] & 2);
2405 /* lowest bit is set when we were primary,
2406 * next bit (weight 2) is set when peer was primary */
2410 case 0: /* !self_pri && !peer_pri */ return 0;
2411 case 1: /* self_pri && !peer_pri */ return 1;
2412 case 2: /* !self_pri && peer_pri */ return -1;
2413 case 3: /* self_pri && peer_pri */
2414 dc = test_bit(DISCARD_CONCURRENT, &mdev->flags);
2420 peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1);
2425 peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1);
2427 if (mdev->agreed_pro_version < 96 ?
2428 (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) ==
2429 (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) :
2430 peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) {
2431 /* The last P_SYNC_UUID did not get though. Undo the last start of
2432 resync as sync source modifications of the peer's UUIDs. */
2434 if (mdev->agreed_pro_version < 91)
2437 mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START];
2438 mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1];
2440 dev_info(DEV, "Did not got last syncUUID packet, corrected:\n");
2441 drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
2448 self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
2449 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2450 peer = mdev->p_uuid[i] & ~((u64)1);
2456 self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
2457 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
2462 self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1);
2464 if (mdev->agreed_pro_version < 96 ?
2465 (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) ==
2466 (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) :
2467 self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) {
2468 /* The last P_SYNC_UUID did not get though. Undo the last start of
2469 resync as sync source modifications of our UUIDs. */
2471 if (mdev->agreed_pro_version < 91)
2474 _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]);
2475 _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]);
2477 dev_info(DEV, "Last syncUUID did not get through, corrected:\n");
2478 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid,
2479 mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0);
2487 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
2488 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2489 self = mdev->ldev->md.uuid[i] & ~((u64)1);
2495 self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
2496 peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1);
2497 if (self == peer && self != ((u64)0))
2501 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2502 self = mdev->ldev->md.uuid[i] & ~((u64)1);
2503 for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) {
2504 peer = mdev->p_uuid[j] & ~((u64)1);
2513 /* drbd_sync_handshake() returns the new conn state on success, or
2514 CONN_MASK (-1) on failure.
2516 static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role,
2517 enum drbd_disk_state peer_disk) __must_hold(local)
2520 enum drbd_conns rv = C_MASK;
2521 enum drbd_disk_state mydisk;
2523 mydisk = mdev->state.disk;
2524 if (mydisk == D_NEGOTIATING)
2525 mydisk = mdev->new_state_tmp.disk;
2527 dev_info(DEV, "drbd_sync_handshake:\n");
2528 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0);
2529 drbd_uuid_dump(mdev, "peer", mdev->p_uuid,
2530 mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
2532 hg = drbd_uuid_compare(mdev, &rule_nr);
2534 dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr);
2537 dev_alert(DEV, "Unrelated data, aborting!\n");
2541 dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000);
2545 if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) ||
2546 (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) {
2547 int f = (hg == -100) || abs(hg) == 2;
2548 hg = mydisk > D_INCONSISTENT ? 1 : -1;
2551 dev_info(DEV, "Becoming sync %s due to disk states.\n",
2552 hg > 0 ? "source" : "target");
2556 drbd_khelper(mdev, "initial-split-brain");
2558 if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) {
2559 int pcount = (mdev->state.role == R_PRIMARY)
2560 + (peer_role == R_PRIMARY);
2561 int forced = (hg == -100);
2565 hg = drbd_asb_recover_0p(mdev);
2568 hg = drbd_asb_recover_1p(mdev);
2571 hg = drbd_asb_recover_2p(mdev);
2574 if (abs(hg) < 100) {
2575 dev_warn(DEV, "Split-Brain detected, %d primaries, "
2576 "automatically solved. Sync from %s node\n",
2577 pcount, (hg < 0) ? "peer" : "this");
2579 dev_warn(DEV, "Doing a full sync, since"
2580 " UUIDs where ambiguous.\n");
2587 if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1))
2589 if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1))
2593 dev_warn(DEV, "Split-Brain detected, manually solved. "
2594 "Sync from %s node\n",
2595 (hg < 0) ? "peer" : "this");
2599 /* FIXME this log message is not correct if we end up here
2600 * after an attempted attach on a diskless node.
2601 * We just refuse to attach -- well, we drop the "connection"
2602 * to that disk, in a way... */
2603 dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n");
2604 drbd_khelper(mdev, "split-brain");
2608 if (hg > 0 && mydisk <= D_INCONSISTENT) {
2609 dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n");
2613 if (hg < 0 && /* by intention we do not use mydisk here. */
2614 mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) {
2615 switch (mdev->net_conf->rr_conflict) {
2616 case ASB_CALL_HELPER:
2617 drbd_khelper(mdev, "pri-lost");
2619 case ASB_DISCONNECT:
2620 dev_err(DEV, "I shall become SyncTarget, but I am primary!\n");
2623 dev_warn(DEV, "Becoming SyncTarget, violating the stable-data"
2628 if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) {
2630 dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n");
2632 dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.",
2633 drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET),
2634 abs(hg) >= 2 ? "full" : "bit-map based");
2639 dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n");
2640 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake",
2641 BM_LOCKED_SET_ALLOWED))
2645 if (hg > 0) { /* become sync source. */
2647 } else if (hg < 0) { /* become sync target */
2651 if (drbd_bm_total_weight(mdev)) {
2652 dev_info(DEV, "No resync, but %lu bits in bitmap!\n",
2653 drbd_bm_total_weight(mdev));
2660 /* returns 1 if invalid */
2661 static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self)
2663 /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */
2664 if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) ||
2665 (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL))
2668 /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */
2669 if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL ||
2670 self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL)
2673 /* everything else is valid if they are equal on both sides. */
2677 /* everything es is invalid. */
2681 static int receive_protocol(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
2683 struct p_protocol *p = &mdev->data.rbuf.protocol;
2684 int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p;
2685 int p_want_lose, p_two_primaries, cf;
2686 char p_integrity_alg[SHARED_SECRET_MAX] = "";
2688 p_proto = be32_to_cpu(p->protocol);
2689 p_after_sb_0p = be32_to_cpu(p->after_sb_0p);
2690 p_after_sb_1p = be32_to_cpu(p->after_sb_1p);
2691 p_after_sb_2p = be32_to_cpu(p->after_sb_2p);
2692 p_two_primaries = be32_to_cpu(p->two_primaries);
2693 cf = be32_to_cpu(p->conn_flags);
2694 p_want_lose = cf & CF_WANT_LOSE;
2696 clear_bit(CONN_DRY_RUN, &mdev->flags);
2698 if (cf & CF_DRY_RUN)
2699 set_bit(CONN_DRY_RUN, &mdev->flags);
2701 if (p_proto != mdev->net_conf->wire_protocol) {
2702 dev_err(DEV, "incompatible communication protocols\n");
2706 if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) {
2707 dev_err(DEV, "incompatible after-sb-0pri settings\n");
2711 if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) {
2712 dev_err(DEV, "incompatible after-sb-1pri settings\n");
2716 if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) {
2717 dev_err(DEV, "incompatible after-sb-2pri settings\n");
2721 if (p_want_lose && mdev->net_conf->want_lose) {
2722 dev_err(DEV, "both sides have the 'want_lose' flag set\n");
2726 if (p_two_primaries != mdev->net_conf->two_primaries) {
2727 dev_err(DEV, "incompatible setting of the two-primaries options\n");
2731 if (mdev->agreed_pro_version >= 87) {
2732 unsigned char *my_alg = mdev->net_conf->integrity_alg;
2734 if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size)
2737 p_integrity_alg[SHARED_SECRET_MAX-1] = 0;
2738 if (strcmp(p_integrity_alg, my_alg)) {
2739 dev_err(DEV, "incompatible setting of the data-integrity-alg\n");
2742 dev_info(DEV, "data-integrity-alg: %s\n",
2743 my_alg[0] ? my_alg : (unsigned char *)"<not-used>");
2749 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2754 * input: alg name, feature name
2755 * return: NULL (alg name was "")
2756 * ERR_PTR(error) if something goes wrong
2757 * or the crypto hash ptr, if it worked out ok. */
2758 struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev,
2759 const char *alg, const char *name)
2761 struct crypto_hash *tfm;
2766 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
2768 dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n",
2769 alg, name, PTR_ERR(tfm));
2772 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
2773 crypto_free_hash(tfm);
2774 dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name);
2775 return ERR_PTR(-EINVAL);
2780 static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int packet_size)
2783 struct p_rs_param_95 *p = &mdev->data.rbuf.rs_param_95;
2784 unsigned int header_size, data_size, exp_max_sz;
2785 struct crypto_hash *verify_tfm = NULL;
2786 struct crypto_hash *csums_tfm = NULL;
2787 const int apv = mdev->agreed_pro_version;
2788 int *rs_plan_s = NULL;
2791 exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param)
2792 : apv == 88 ? sizeof(struct p_rs_param)
2794 : apv <= 94 ? sizeof(struct p_rs_param_89)
2795 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
2797 if (packet_size > exp_max_sz) {
2798 dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n",
2799 packet_size, exp_max_sz);
2804 header_size = sizeof(struct p_rs_param) - sizeof(struct p_header80);
2805 data_size = packet_size - header_size;
2806 } else if (apv <= 94) {
2807 header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header80);
2808 data_size = packet_size - header_size;
2809 D_ASSERT(data_size == 0);
2811 header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header80);
2812 data_size = packet_size - header_size;
2813 D_ASSERT(data_size == 0);
2816 /* initialize verify_alg and csums_alg */
2817 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
2819 if (drbd_recv(mdev, &p->head.payload, header_size) != header_size)
2822 mdev->sync_conf.rate = be32_to_cpu(p->rate);
2826 if (data_size > SHARED_SECRET_MAX) {
2827 dev_err(DEV, "verify-alg too long, "
2828 "peer wants %u, accepting only %u byte\n",
2829 data_size, SHARED_SECRET_MAX);
2833 if (drbd_recv(mdev, p->verify_alg, data_size) != data_size)
2836 /* we expect NUL terminated string */
2837 /* but just in case someone tries to be evil */
2838 D_ASSERT(p->verify_alg[data_size-1] == 0);
2839 p->verify_alg[data_size-1] = 0;
2841 } else /* apv >= 89 */ {
2842 /* we still expect NUL terminated strings */
2843 /* but just in case someone tries to be evil */
2844 D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0);
2845 D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0);
2846 p->verify_alg[SHARED_SECRET_MAX-1] = 0;
2847 p->csums_alg[SHARED_SECRET_MAX-1] = 0;
2850 if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) {
2851 if (mdev->state.conn == C_WF_REPORT_PARAMS) {
2852 dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n",
2853 mdev->sync_conf.verify_alg, p->verify_alg);
2856 verify_tfm = drbd_crypto_alloc_digest_safe(mdev,
2857 p->verify_alg, "verify-alg");
2858 if (IS_ERR(verify_tfm)) {
2864 if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) {
2865 if (mdev->state.conn == C_WF_REPORT_PARAMS) {
2866 dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n",
2867 mdev->sync_conf.csums_alg, p->csums_alg);
2870 csums_tfm = drbd_crypto_alloc_digest_safe(mdev,
2871 p->csums_alg, "csums-alg");
2872 if (IS_ERR(csums_tfm)) {
2879 mdev->sync_conf.rate = be32_to_cpu(p->rate);
2880 mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead);
2881 mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target);
2882 mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target);
2883 mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate);
2885 fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
2886 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
2887 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
2889 dev_err(DEV, "kmalloc of fifo_buffer failed");
2895 spin_lock(&mdev->peer_seq_lock);
2896 /* lock against drbd_nl_syncer_conf() */
2898 strcpy(mdev->sync_conf.verify_alg, p->verify_alg);
2899 mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1;
2900 crypto_free_hash(mdev->verify_tfm);
2901 mdev->verify_tfm = verify_tfm;
2902 dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg);
2905 strcpy(mdev->sync_conf.csums_alg, p->csums_alg);
2906 mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1;
2907 crypto_free_hash(mdev->csums_tfm);
2908 mdev->csums_tfm = csums_tfm;
2909 dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg);
2911 if (fifo_size != mdev->rs_plan_s.size) {
2912 kfree(mdev->rs_plan_s.values);
2913 mdev->rs_plan_s.values = rs_plan_s;
2914 mdev->rs_plan_s.size = fifo_size;
2915 mdev->rs_planed = 0;
2917 spin_unlock(&mdev->peer_seq_lock);
2922 /* just for completeness: actually not needed,
2923 * as this is not reached if csums_tfm was ok. */
2924 crypto_free_hash(csums_tfm);
2925 /* but free the verify_tfm again, if csums_tfm did not work out */
2926 crypto_free_hash(verify_tfm);
2927 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2931 /* warn if the arguments differ by more than 12.5% */
2932 static void warn_if_differ_considerably(struct drbd_conf *mdev,
2933 const char *s, sector_t a, sector_t b)
2936 if (a == 0 || b == 0)
2938 d = (a > b) ? (a - b) : (b - a);
2939 if (d > (a>>3) || d > (b>>3))
2940 dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s,
2941 (unsigned long long)a, (unsigned long long)b);
2944 static int receive_sizes(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
2946 struct p_sizes *p = &mdev->data.rbuf.sizes;
2947 enum determine_dev_size dd = unchanged;
2948 sector_t p_size, p_usize, my_usize;
2949 int ldsc = 0; /* local disk size changed */
2950 enum dds_flags ddsf;
2952 p_size = be64_to_cpu(p->d_size);
2953 p_usize = be64_to_cpu(p->u_size);
2955 if (p_size == 0 && mdev->state.disk == D_DISKLESS) {
2956 dev_err(DEV, "some backing storage is needed\n");
2957 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2961 /* just store the peer's disk size for now.
2962 * we still need to figure out whether we accept that. */
2963 mdev->p_size = p_size;
2965 if (get_ldev(mdev)) {
2966 warn_if_differ_considerably(mdev, "lower level device sizes",
2967 p_size, drbd_get_max_capacity(mdev->ldev));
2968 warn_if_differ_considerably(mdev, "user requested size",
2969 p_usize, mdev->ldev->dc.disk_size);
2971 /* if this is the first connect, or an otherwise expected
2972 * param exchange, choose the minimum */
2973 if (mdev->state.conn == C_WF_REPORT_PARAMS)
2974 p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size,
2977 my_usize = mdev->ldev->dc.disk_size;
2979 if (mdev->ldev->dc.disk_size != p_usize) {
2980 mdev->ldev->dc.disk_size = p_usize;
2981 dev_info(DEV, "Peer sets u_size to %lu sectors\n",
2982 (unsigned long)mdev->ldev->dc.disk_size);
2985 /* Never shrink a device with usable data during connect.
2986 But allow online shrinking if we are connected. */
2987 if (drbd_new_dev_size(mdev, mdev->ldev, 0) <
2988 drbd_get_capacity(mdev->this_bdev) &&
2989 mdev->state.disk >= D_OUTDATED &&
2990 mdev->state.conn < C_CONNECTED) {
2991 dev_err(DEV, "The peer's disk size is too small!\n");
2992 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2993 mdev->ldev->dc.disk_size = my_usize;
3000 ddsf = be16_to_cpu(p->dds_flags);
3001 if (get_ldev(mdev)) {
3002 dd = drbd_determine_dev_size(mdev, ddsf);
3004 if (dd == dev_size_error)
3008 /* I am diskless, need to accept the peer's size. */
3009 drbd_set_my_capacity(mdev, p_size);
3012 mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size);
3013 drbd_reconsider_max_bio_size(mdev);
3015 if (get_ldev(mdev)) {
3016 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) {
3017 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
3024 if (mdev->state.conn > C_WF_REPORT_PARAMS) {
3025 if (be64_to_cpu(p->c_size) !=
3026 drbd_get_capacity(mdev->this_bdev) || ldsc) {
3027 /* we have different sizes, probably peer
3028 * needs to know my new size... */
3029 drbd_send_sizes(mdev, 0, ddsf);
3031 if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) ||
3032 (dd == grew && mdev->state.conn == C_CONNECTED)) {
3033 if (mdev->state.pdsk >= D_INCONSISTENT &&
3034 mdev->state.disk >= D_INCONSISTENT) {
3035 if (ddsf & DDSF_NO_RESYNC)
3036 dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n");
3038 resync_after_online_grow(mdev);
3040 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
3047 static int receive_uuids(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3049 struct p_uuids *p = &mdev->data.rbuf.uuids;
3051 int i, updated_uuids = 0;
3053 p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO);
3055 for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++)
3056 p_uuid[i] = be64_to_cpu(p->uuid[i]);
3058 kfree(mdev->p_uuid);
3059 mdev->p_uuid = p_uuid;
3061 if (mdev->state.conn < C_CONNECTED &&
3062 mdev->state.disk < D_INCONSISTENT &&
3063 mdev->state.role == R_PRIMARY &&
3064 (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) {
3065 dev_err(DEV, "Can only connect to data with current UUID=%016llX\n",
3066 (unsigned long long)mdev->ed_uuid);
3067 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3071 if (get_ldev(mdev)) {
3072 int skip_initial_sync =
3073 mdev->state.conn == C_CONNECTED &&
3074 mdev->agreed_pro_version >= 90 &&
3075 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED &&
3076 (p_uuid[UI_FLAGS] & 8);
3077 if (skip_initial_sync) {
3078 dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n");
3079 drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
3080 "clear_n_write from receive_uuids",
3081 BM_LOCKED_TEST_ALLOWED);
3082 _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]);
3083 _drbd_uuid_set(mdev, UI_BITMAP, 0);
3084 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3090 } else if (mdev->state.disk < D_INCONSISTENT &&
3091 mdev->state.role == R_PRIMARY) {
3092 /* I am a diskless primary, the peer just created a new current UUID
3094 updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]);
3097 /* Before we test for the disk state, we should wait until an eventually
3098 ongoing cluster wide state change is finished. That is important if
3099 we are primary and are detaching from our disk. We need to see the
3100 new disk state... */
3101 wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags));
3102 if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT)
3103 updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]);
3106 drbd_print_uuids(mdev, "receiver updated UUIDs to");
3112 * convert_state() - Converts the peer's view of the cluster state to our point of view
3113 * @ps: The state as seen by the peer.
3115 static union drbd_state convert_state(union drbd_state ps)
3117 union drbd_state ms;
3119 static enum drbd_conns c_tab[] = {
3120 [C_CONNECTED] = C_CONNECTED,
3122 [C_STARTING_SYNC_S] = C_STARTING_SYNC_T,
3123 [C_STARTING_SYNC_T] = C_STARTING_SYNC_S,
3124 [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */
3125 [C_VERIFY_S] = C_VERIFY_T,
3131 ms.conn = c_tab[ps.conn];
3136 ms.peer_isp = (ps.aftr_isp | ps.user_isp);
3141 static int receive_req_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3143 struct p_req_state *p = &mdev->data.rbuf.req_state;
3144 union drbd_state mask, val;
3145 enum drbd_state_rv rv;
3147 mask.i = be32_to_cpu(p->mask);
3148 val.i = be32_to_cpu(p->val);
3150 if (test_bit(DISCARD_CONCURRENT, &mdev->flags) &&
3151 test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) {
3152 drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG);
3156 mask = convert_state(mask);
3157 val = convert_state(val);
3159 rv = drbd_change_state(mdev, CS_VERBOSE, mask, val);
3161 drbd_send_sr_reply(mdev, rv);
3167 static int receive_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3169 struct p_state *p = &mdev->data.rbuf.state;
3170 union drbd_state os, ns, peer_state;
3171 enum drbd_disk_state real_peer_disk;
3172 enum chg_state_flags cs_flags;
3175 peer_state.i = be32_to_cpu(p->state);
3177 real_peer_disk = peer_state.disk;
3178 if (peer_state.disk == D_NEGOTIATING) {
3179 real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT;
3180 dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk));
3183 spin_lock_irq(&mdev->req_lock);
3185 os = ns = mdev->state;
3186 spin_unlock_irq(&mdev->req_lock);
3188 /* peer says his disk is uptodate, while we think it is inconsistent,
3189 * and this happens while we think we have a sync going on. */
3190 if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE &&
3191 os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) {
3192 /* If we are (becoming) SyncSource, but peer is still in sync
3193 * preparation, ignore its uptodate-ness to avoid flapping, it
3194 * will change to inconsistent once the peer reaches active
3196 * It may have changed syncer-paused flags, however, so we
3197 * cannot ignore this completely. */
3198 if (peer_state.conn > C_CONNECTED &&
3199 peer_state.conn < C_SYNC_SOURCE)
3200 real_peer_disk = D_INCONSISTENT;
3202 /* if peer_state changes to connected at the same time,
3203 * it explicitly notifies us that it finished resync.
3204 * Maybe we should finish it up, too? */
3205 else if (os.conn >= C_SYNC_SOURCE &&
3206 peer_state.conn == C_CONNECTED) {
3207 if (drbd_bm_total_weight(mdev) <= mdev->rs_failed)
3208 drbd_resync_finished(mdev);
3213 /* peer says his disk is inconsistent, while we think it is uptodate,
3214 * and this happens while the peer still thinks we have a sync going on,
3215 * but we think we are already done with the sync.
3216 * We ignore this to avoid flapping pdsk.
3217 * This should not happen, if the peer is a recent version of drbd. */
3218 if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT &&
3219 os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE)
3220 real_peer_disk = D_UP_TO_DATE;
3222 if (ns.conn == C_WF_REPORT_PARAMS)
3223 ns.conn = C_CONNECTED;
3225 if (peer_state.conn == C_AHEAD)
3228 if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING &&
3229 get_ldev_if_state(mdev, D_NEGOTIATING)) {
3230 int cr; /* consider resync */
3232 /* if we established a new connection */
3233 cr = (os.conn < C_CONNECTED);
3234 /* if we had an established connection
3235 * and one of the nodes newly attaches a disk */
3236 cr |= (os.conn == C_CONNECTED &&
3237 (peer_state.disk == D_NEGOTIATING ||
3238 os.disk == D_NEGOTIATING));
3239 /* if we have both been inconsistent, and the peer has been
3240 * forced to be UpToDate with --overwrite-data */
3241 cr |= test_bit(CONSIDER_RESYNC, &mdev->flags);
3242 /* if we had been plain connected, and the admin requested to
3243 * start a sync by "invalidate" or "invalidate-remote" */
3244 cr |= (os.conn == C_CONNECTED &&
3245 (peer_state.conn >= C_STARTING_SYNC_S &&
3246 peer_state.conn <= C_WF_BITMAP_T));
3249 ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk);
3252 if (ns.conn == C_MASK) {
3253 ns.conn = C_CONNECTED;
3254 if (mdev->state.disk == D_NEGOTIATING) {
3255 drbd_force_state(mdev, NS(disk, D_FAILED));
3256 } else if (peer_state.disk == D_NEGOTIATING) {
3257 dev_err(DEV, "Disk attach process on the peer node was aborted.\n");
3258 peer_state.disk = D_DISKLESS;
3259 real_peer_disk = D_DISKLESS;
3261 if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags))
3263 D_ASSERT(os.conn == C_WF_REPORT_PARAMS);
3264 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3270 spin_lock_irq(&mdev->req_lock);
3271 if (mdev->state.i != os.i)
3273 clear_bit(CONSIDER_RESYNC, &mdev->flags);
3274 ns.peer = peer_state.role;
3275 ns.pdsk = real_peer_disk;
3276 ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp);
3277 if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING)
3278 ns.disk = mdev->new_state_tmp.disk;
3279 cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD);
3280 if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED &&
3281 test_bit(NEW_CUR_UUID, &mdev->flags)) {
3282 /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this
3283 for temporal network outages! */
3284 spin_unlock_irq(&mdev->req_lock);
3285 dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n");
3287 drbd_uuid_new_current(mdev);
3288 clear_bit(NEW_CUR_UUID, &mdev->flags);
3289 drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0));
3292 rv = _drbd_set_state(mdev, ns, cs_flags, NULL);
3294 spin_unlock_irq(&mdev->req_lock);
3296 if (rv < SS_SUCCESS) {
3297 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3301 if (os.conn > C_WF_REPORT_PARAMS) {
3302 if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED &&
3303 peer_state.disk != D_NEGOTIATING ) {
3304 /* we want resync, peer has not yet decided to sync... */
3305 /* Nowadays only used when forcing a node into primary role and
3306 setting its disk to UpToDate with that */
3307 drbd_send_uuids(mdev);
3308 drbd_send_state(mdev);
3312 mdev->net_conf->want_lose = 0;
3314 drbd_md_sync(mdev); /* update connected indicator, la_size, ... */
3319 static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3321 struct p_rs_uuid *p = &mdev->data.rbuf.rs_uuid;
3323 wait_event(mdev->misc_wait,
3324 mdev->state.conn == C_WF_SYNC_UUID ||
3325 mdev->state.conn == C_BEHIND ||
3326 mdev->state.conn < C_CONNECTED ||
3327 mdev->state.disk < D_NEGOTIATING);
3329 /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */
3331 /* Here the _drbd_uuid_ functions are right, current should
3332 _not_ be rotated into the history */
3333 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
3334 _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid));
3335 _drbd_uuid_set(mdev, UI_BITMAP, 0UL);
3337 drbd_print_uuids(mdev, "updated sync uuid");
3338 drbd_start_resync(mdev, C_SYNC_TARGET);
3342 dev_err(DEV, "Ignoring SyncUUID packet!\n");
3348 * receive_bitmap_plain
3350 * Return 0 when done, 1 when another iteration is needed, and a negative error
3351 * code upon failure.
3354 receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size,
3355 unsigned long *buffer, struct bm_xfer_ctx *c)
3357 unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
3358 unsigned want = num_words * sizeof(long);
3361 if (want != data_size) {
3362 dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size);
3367 err = drbd_recv(mdev, buffer, want);
3374 drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer);
3376 c->word_offset += num_words;
3377 c->bit_offset = c->word_offset * BITS_PER_LONG;
3378 if (c->bit_offset > c->bm_bits)
3379 c->bit_offset = c->bm_bits;
3387 * Return 0 when done, 1 when another iteration is needed, and a negative error
3388 * code upon failure.
3391 recv_bm_rle_bits(struct drbd_conf *mdev,
3392 struct p_compressed_bm *p,
3393 struct bm_xfer_ctx *c)
3395 struct bitstream bs;
3399 unsigned long s = c->bit_offset;
3401 int len = be16_to_cpu(p->head.length) - (sizeof(*p) - sizeof(p->head));
3402 int toggle = DCBP_get_start(p);
3406 bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p));
3408 bits = bitstream_get_bits(&bs, &look_ahead, 64);
3412 for (have = bits; have > 0; s += rl, toggle = !toggle) {
3413 bits = vli_decode_bits(&rl, look_ahead);
3419 if (e >= c->bm_bits) {
3420 dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e);
3423 _drbd_bm_set_bits(mdev, s, e);
3427 dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n",
3428 have, bits, look_ahead,
3429 (unsigned int)(bs.cur.b - p->code),
3430 (unsigned int)bs.buf_len);
3433 look_ahead >>= bits;
3436 bits = bitstream_get_bits(&bs, &tmp, 64 - have);
3439 look_ahead |= tmp << have;
3444 bm_xfer_ctx_bit_to_word_offset(c);
3446 return (s != c->bm_bits);
3452 * Return 0 when done, 1 when another iteration is needed, and a negative error
3453 * code upon failure.
3456 decode_bitmap_c(struct drbd_conf *mdev,
3457 struct p_compressed_bm *p,
3458 struct bm_xfer_ctx *c)
3460 if (DCBP_get_code(p) == RLE_VLI_Bits)
3461 return recv_bm_rle_bits(mdev, p, c);
3463 /* other variants had been implemented for evaluation,
3464 * but have been dropped as this one turned out to be "best"
3465 * during all our tests. */
3467 dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding);
3468 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
3472 void INFO_bm_xfer_stats(struct drbd_conf *mdev,
3473 const char *direction, struct bm_xfer_ctx *c)
3475 /* what would it take to transfer it "plaintext" */
3476 unsigned plain = sizeof(struct p_header80) *
3477 ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1)
3478 + c->bm_words * sizeof(long);
3479 unsigned total = c->bytes[0] + c->bytes[1];
3482 /* total can not be zero. but just in case: */
3486 /* don't report if not compressed */
3490 /* total < plain. check for overflow, still */
3491 r = (total > UINT_MAX/1000) ? (total / (plain/1000))
3492 : (1000 * total / plain);
3498 dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), "
3499 "total %u; compression: %u.%u%%\n",
3501 c->bytes[1], c->packets[1],
3502 c->bytes[0], c->packets[0],
3503 total, r/10, r % 10);
3506 /* Since we are processing the bitfield from lower addresses to higher,
3507 it does not matter if the process it in 32 bit chunks or 64 bit
3508 chunks as long as it is little endian. (Understand it as byte stream,
3509 beginning with the lowest byte...) If we would use big endian
3510 we would need to process it from the highest address to the lowest,
3511 in order to be agnostic to the 32 vs 64 bits issue.
3513 returns 0 on failure, 1 if we successfully received it. */
3514 static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3516 struct bm_xfer_ctx c;
3520 struct p_header80 *h = &mdev->data.rbuf.header.h80;
3522 drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED);
3523 /* you are supposed to send additional out-of-sync information
3524 * if you actually set bits during this phase */
3526 /* maybe we should use some per thread scratch page,
3527 * and allocate that during initial device creation? */
3528 buffer = (unsigned long *) __get_free_page(GFP_NOIO);
3530 dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
3534 c = (struct bm_xfer_ctx) {
3535 .bm_bits = drbd_bm_bits(mdev),
3536 .bm_words = drbd_bm_words(mdev),
3540 if (cmd == P_BITMAP) {
3541 err = receive_bitmap_plain(mdev, data_size, buffer, &c);
3542 } else if (cmd == P_COMPRESSED_BITMAP) {
3543 /* MAYBE: sanity check that we speak proto >= 90,
3544 * and the feature is enabled! */
3545 struct p_compressed_bm *p;
3547 if (data_size > BM_PACKET_PAYLOAD_BYTES) {
3548 dev_err(DEV, "ReportCBitmap packet too large\n");
3551 /* use the page buff */
3553 memcpy(p, h, sizeof(*h));
3554 if (drbd_recv(mdev, p->head.payload, data_size) != data_size)
3556 if (data_size <= (sizeof(*p) - sizeof(p->head))) {
3557 dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size);
3560 err = decode_bitmap_c(mdev, p, &c);
3562 dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd);
3566 c.packets[cmd == P_BITMAP]++;
3567 c.bytes[cmd == P_BITMAP] += sizeof(struct p_header80) + data_size;
3574 if (!drbd_recv_header(mdev, &cmd, &data_size))
3578 INFO_bm_xfer_stats(mdev, "receive", &c);
3580 if (mdev->state.conn == C_WF_BITMAP_T) {
3581 enum drbd_state_rv rv;
3583 ok = !drbd_send_bitmap(mdev);
3586 /* Omit CS_ORDERED with this state transition to avoid deadlocks. */
3587 rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
3588 D_ASSERT(rv == SS_SUCCESS);
3589 } else if (mdev->state.conn != C_WF_BITMAP_S) {
3590 /* admin may have requested C_DISCONNECTING,
3591 * other threads may have noticed network errors */
3592 dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n",
3593 drbd_conn_str(mdev->state.conn));
3598 drbd_bm_unlock(mdev);
3599 if (ok && mdev->state.conn == C_WF_BITMAP_S)
3600 drbd_start_resync(mdev, C_SYNC_SOURCE);
3601 free_page((unsigned long) buffer);
3605 static int receive_skip(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3607 /* TODO zero copy sink :) */
3608 static char sink[128];
3611 dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n",
3616 want = min_t(int, size, sizeof(sink));
3617 r = drbd_recv(mdev, sink, want);
3618 ERR_IF(r <= 0) break;
3624 static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3626 /* Make sure we've acked all the TCP data associated
3627 * with the data requests being unplugged */
3628 drbd_tcp_quickack(mdev->data.socket);
3633 static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3635 struct p_block_desc *p = &mdev->data.rbuf.block_desc;
3637 switch (mdev->state.conn) {
3638 case C_WF_SYNC_UUID:
3643 dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n",
3644 drbd_conn_str(mdev->state.conn));
3647 drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize));
3652 typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, enum drbd_packets cmd, unsigned int to_receive);
3657 drbd_cmd_handler_f function;
3660 static struct data_cmd drbd_cmd_handler[] = {
3661 [P_DATA] = { 1, sizeof(struct p_data), receive_Data },
3662 [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply },
3663 [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } ,
3664 [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } ,
3665 [P_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } ,
3666 [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } ,
3667 [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header80), receive_UnplugRemote },
3668 [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
3669 [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
3670 [P_SYNC_PARAM] = { 1, sizeof(struct p_header80), receive_SyncParam },
3671 [P_SYNC_PARAM89] = { 1, sizeof(struct p_header80), receive_SyncParam },
3672 [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol },
3673 [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids },
3674 [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes },
3675 [P_STATE] = { 0, sizeof(struct p_state), receive_state },
3676 [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state },
3677 [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid },
3678 [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
3679 [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest },
3680 [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest },
3681 [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip },
3682 [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync },
3683 /* anything missing from this table is in
3684 * the asender_tbl, see get_asender_cmd */
3685 [P_MAX_CMD] = { 0, 0, NULL },
3688 /* All handler functions that expect a sub-header get that sub-heder in
3689 mdev->data.rbuf.header.head.payload.
3691 Usually in mdev->data.rbuf.header.head the callback can find the usual
3692 p_header, but they may not rely on that. Since there is also p_header95 !
3695 static void drbdd(struct drbd_conf *mdev)
3697 union p_header *header = &mdev->data.rbuf.header;
3698 unsigned int packet_size;
3699 enum drbd_packets cmd;
3700 size_t shs; /* sub header size */
3703 while (get_t_state(&mdev->receiver) == Running) {
3704 drbd_thread_current_set_cpu(mdev);
3705 if (!drbd_recv_header(mdev, &cmd, &packet_size))
3708 if (unlikely(cmd >= P_MAX_CMD || !drbd_cmd_handler[cmd].function)) {
3709 dev_err(DEV, "unknown packet type %d, l: %d!\n", cmd, packet_size);
3713 shs = drbd_cmd_handler[cmd].pkt_size - sizeof(union p_header);
3714 if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) {
3715 dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size);
3720 rv = drbd_recv(mdev, &header->h80.payload, shs);
3721 if (unlikely(rv != shs)) {
3722 if (!signal_pending(current))
3723 dev_warn(DEV, "short read while reading sub header: rv=%d\n", rv);
3728 rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs);
3730 if (unlikely(!rv)) {
3731 dev_err(DEV, "error receiving %s, l: %d!\n",
3732 cmdname(cmd), packet_size);
3739 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
3741 /* If we leave here, we probably want to update at least the
3742 * "Connected" indicator on stable storage. Do so explicitly here. */
3746 void drbd_flush_workqueue(struct drbd_conf *mdev)
3748 struct drbd_wq_barrier barr;
3750 barr.w.cb = w_prev_work_done;
3751 init_completion(&barr.done);
3752 drbd_queue_work(&mdev->data.work, &barr.w);
3753 wait_for_completion(&barr.done);
3756 static void drbd_disconnect(struct drbd_conf *mdev)
3758 enum drbd_fencing_p fp;
3759 union drbd_state os, ns;
3760 int rv = SS_UNKNOWN_ERROR;
3763 if (mdev->state.conn == C_STANDALONE)
3766 /* asender does not clean up anything. it must not interfere, either */
3767 drbd_thread_stop(&mdev->asender);
3768 drbd_free_sock(mdev);
3770 /* wait for current activity to cease. */
3771 spin_lock_irq(&mdev->req_lock);
3772 _drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
3773 _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee);
3774 _drbd_wait_ee_list_empty(mdev, &mdev->read_ee);
3775 spin_unlock_irq(&mdev->req_lock);
3777 /* We do not have data structures that would allow us to
3778 * get the rs_pending_cnt down to 0 again.
3779 * * On C_SYNC_TARGET we do not have any data structures describing
3780 * the pending RSDataRequest's we have sent.
3781 * * On C_SYNC_SOURCE there is no data structure that tracks
3782 * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget.
3783 * And no, it is not the sum of the reference counts in the
3784 * resync_LRU. The resync_LRU tracks the whole operation including
3785 * the disk-IO, while the rs_pending_cnt only tracks the blocks
3787 drbd_rs_cancel_all(mdev);
3789 mdev->rs_failed = 0;
3790 atomic_set(&mdev->rs_pending_cnt, 0);
3791 wake_up(&mdev->misc_wait);
3793 del_timer(&mdev->request_timer);
3795 /* make sure syncer is stopped and w_resume_next_sg queued */
3796 del_timer_sync(&mdev->resync_timer);
3797 resync_timer_fn((unsigned long)mdev);
3799 /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier,
3800 * w_make_resync_request etc. which may still be on the worker queue
3801 * to be "canceled" */
3802 drbd_flush_workqueue(mdev);
3804 /* This also does reclaim_net_ee(). If we do this too early, we might
3805 * miss some resync ee and pages.*/
3806 drbd_process_done_ee(mdev);
3808 kfree(mdev->p_uuid);
3809 mdev->p_uuid = NULL;
3811 if (!is_susp(mdev->state))
3814 dev_info(DEV, "Connection closed\n");
3819 if (get_ldev(mdev)) {
3820 fp = mdev->ldev->dc.fencing;
3824 if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN)
3825 drbd_try_outdate_peer_async(mdev);
3827 spin_lock_irq(&mdev->req_lock);
3829 if (os.conn >= C_UNCONNECTED) {
3830 /* Do not restart in case we are C_DISCONNECTING */
3832 ns.conn = C_UNCONNECTED;
3833 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
3835 spin_unlock_irq(&mdev->req_lock);
3837 if (os.conn == C_DISCONNECTING) {
3838 wait_event(mdev->net_cnt_wait, atomic_read(&mdev->net_cnt) == 0);
3840 crypto_free_hash(mdev->cram_hmac_tfm);
3841 mdev->cram_hmac_tfm = NULL;
3843 kfree(mdev->net_conf);
3844 mdev->net_conf = NULL;
3845 drbd_request_state(mdev, NS(conn, C_STANDALONE));
3848 /* serialize with bitmap writeout triggered by the state change,
3850 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
3852 /* tcp_close and release of sendpage pages can be deferred. I don't
3853 * want to use SO_LINGER, because apparently it can be deferred for
3854 * more than 20 seconds (longest time I checked).
3856 * Actually we don't care for exactly when the network stack does its
3857 * put_page(), but release our reference on these pages right here.
3859 i = drbd_release_ee(mdev, &mdev->net_ee);
3861 dev_info(DEV, "net_ee not empty, killed %u entries\n", i);
3862 i = atomic_read(&mdev->pp_in_use_by_net);
3864 dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i);
3865 i = atomic_read(&mdev->pp_in_use);
3867 dev_info(DEV, "pp_in_use = %d, expected 0\n", i);
3869 D_ASSERT(list_empty(&mdev->read_ee));
3870 D_ASSERT(list_empty(&mdev->active_ee));
3871 D_ASSERT(list_empty(&mdev->sync_ee));
3872 D_ASSERT(list_empty(&mdev->done_ee));
3874 /* ok, no more ee's on the fly, it is safe to reset the epoch_size */
3875 atomic_set(&mdev->current_epoch->epoch_size, 0);
3876 D_ASSERT(list_empty(&mdev->current_epoch->list));
3880 * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version
3881 * we can agree on is stored in agreed_pro_version.
3883 * feature flags and the reserved array should be enough room for future
3884 * enhancements of the handshake protocol, and possible plugins...
3886 * for now, they are expected to be zero, but ignored.
3888 static int drbd_send_handshake(struct drbd_conf *mdev)
3890 /* ASSERT current == mdev->receiver ... */
3891 struct p_handshake *p = &mdev->data.sbuf.handshake;
3894 if (mutex_lock_interruptible(&mdev->data.mutex)) {
3895 dev_err(DEV, "interrupted during initial handshake\n");
3896 return 0; /* interrupted. not ok. */
3899 if (mdev->data.socket == NULL) {
3900 mutex_unlock(&mdev->data.mutex);
3904 memset(p, 0, sizeof(*p));
3905 p->protocol_min = cpu_to_be32(PRO_VERSION_MIN);
3906 p->protocol_max = cpu_to_be32(PRO_VERSION_MAX);
3907 ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE,
3908 (struct p_header80 *)p, sizeof(*p), 0 );
3909 mutex_unlock(&mdev->data.mutex);
3915 * 1 yes, we have a valid connection
3916 * 0 oops, did not work out, please try again
3917 * -1 peer talks different language,
3918 * no point in trying again, please go standalone.
3920 static int drbd_do_handshake(struct drbd_conf *mdev)
3922 /* ASSERT current == mdev->receiver ... */
3923 struct p_handshake *p = &mdev->data.rbuf.handshake;
3924 const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80);
3925 unsigned int length;
3926 enum drbd_packets cmd;
3929 rv = drbd_send_handshake(mdev);
3933 rv = drbd_recv_header(mdev, &cmd, &length);
3937 if (cmd != P_HAND_SHAKE) {
3938 dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n",
3943 if (length != expect) {
3944 dev_err(DEV, "expected HandShake length: %u, received: %u\n",
3949 rv = drbd_recv(mdev, &p->head.payload, expect);
3952 if (!signal_pending(current))
3953 dev_warn(DEV, "short read receiving handshake packet: l=%u\n", rv);
3957 p->protocol_min = be32_to_cpu(p->protocol_min);
3958 p->protocol_max = be32_to_cpu(p->protocol_max);
3959 if (p->protocol_max == 0)
3960 p->protocol_max = p->protocol_min;
3962 if (PRO_VERSION_MAX < p->protocol_min ||
3963 PRO_VERSION_MIN > p->protocol_max)
3966 mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max);
3968 dev_info(DEV, "Handshake successful: "
3969 "Agreed network protocol version %d\n", mdev->agreed_pro_version);
3974 dev_err(DEV, "incompatible DRBD dialects: "
3975 "I support %d-%d, peer supports %d-%d\n",
3976 PRO_VERSION_MIN, PRO_VERSION_MAX,
3977 p->protocol_min, p->protocol_max);
3981 #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE)
3982 static int drbd_do_auth(struct drbd_conf *mdev)
3984 dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n");
3985 dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n");
3989 #define CHALLENGE_LEN 64
3993 0 - failed, try again (network error),
3994 -1 - auth failed, don't try again.
3997 static int drbd_do_auth(struct drbd_conf *mdev)
3999 char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */
4000 struct scatterlist sg;
4001 char *response = NULL;
4002 char *right_response = NULL;
4003 char *peers_ch = NULL;
4004 unsigned int key_len = strlen(mdev->net_conf->shared_secret);
4005 unsigned int resp_size;
4006 struct hash_desc desc;
4007 enum drbd_packets cmd;
4008 unsigned int length;
4011 desc.tfm = mdev->cram_hmac_tfm;
4014 rv = crypto_hash_setkey(mdev->cram_hmac_tfm,
4015 (u8 *)mdev->net_conf->shared_secret, key_len);
4017 dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv);
4022 get_random_bytes(my_challenge, CHALLENGE_LEN);
4024 rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN);
4028 rv = drbd_recv_header(mdev, &cmd, &length);
4032 if (cmd != P_AUTH_CHALLENGE) {
4033 dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n",
4039 if (length > CHALLENGE_LEN * 2) {
4040 dev_err(DEV, "expected AuthChallenge payload too big.\n");
4045 peers_ch = kmalloc(length, GFP_NOIO);
4046 if (peers_ch == NULL) {
4047 dev_err(DEV, "kmalloc of peers_ch failed\n");
4052 rv = drbd_recv(mdev, peers_ch, length);
4055 if (!signal_pending(current))
4056 dev_warn(DEV, "short read AuthChallenge: l=%u\n", rv);
4061 resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm);
4062 response = kmalloc(resp_size, GFP_NOIO);
4063 if (response == NULL) {
4064 dev_err(DEV, "kmalloc of response failed\n");
4069 sg_init_table(&sg, 1);
4070 sg_set_buf(&sg, peers_ch, length);
4072 rv = crypto_hash_digest(&desc, &sg, sg.length, response);
4074 dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
4079 rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size);
4083 rv = drbd_recv_header(mdev, &cmd, &length);
4087 if (cmd != P_AUTH_RESPONSE) {
4088 dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n",
4094 if (length != resp_size) {
4095 dev_err(DEV, "expected AuthResponse payload of wrong size\n");
4100 rv = drbd_recv(mdev, response , resp_size);
4102 if (rv != resp_size) {
4103 if (!signal_pending(current))
4104 dev_warn(DEV, "short read receiving AuthResponse: l=%u\n", rv);
4109 right_response = kmalloc(resp_size, GFP_NOIO);
4110 if (right_response == NULL) {
4111 dev_err(DEV, "kmalloc of right_response failed\n");
4116 sg_set_buf(&sg, my_challenge, CHALLENGE_LEN);
4118 rv = crypto_hash_digest(&desc, &sg, sg.length, right_response);
4120 dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
4125 rv = !memcmp(response, right_response, resp_size);
4128 dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n",
4129 resp_size, mdev->net_conf->cram_hmac_alg);
4136 kfree(right_response);
4142 int drbdd_init(struct drbd_thread *thi)
4144 struct drbd_conf *mdev = thi->mdev;
4145 unsigned int minor = mdev_to_minor(mdev);
4148 sprintf(current->comm, "drbd%d_receiver", minor);
4150 dev_info(DEV, "receiver (re)started\n");
4153 h = drbd_connect(mdev);
4155 drbd_disconnect(mdev);
4156 schedule_timeout_interruptible(HZ);
4159 dev_warn(DEV, "Discarding network configuration.\n");
4160 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
4165 if (get_net_conf(mdev)) {
4171 drbd_disconnect(mdev);
4173 dev_info(DEV, "receiver terminated\n");
4177 /* ********* acknowledge sender ******** */
4179 static int got_RqSReply(struct drbd_conf *mdev, struct p_header80 *h)
4181 struct p_req_state_reply *p = (struct p_req_state_reply *)h;
4183 int retcode = be32_to_cpu(p->retcode);
4185 if (retcode >= SS_SUCCESS) {
4186 set_bit(CL_ST_CHG_SUCCESS, &mdev->flags);
4188 set_bit(CL_ST_CHG_FAIL, &mdev->flags);
4189 dev_err(DEV, "Requested state change failed by peer: %s (%d)\n",
4190 drbd_set_st_err_str(retcode), retcode);
4192 wake_up(&mdev->state_wait);
4197 static int got_Ping(struct drbd_conf *mdev, struct p_header80 *h)
4199 return drbd_send_ping_ack(mdev);
4203 static int got_PingAck(struct drbd_conf *mdev, struct p_header80 *h)
4205 /* restore idle timeout */
4206 mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ;
4207 if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags))
4208 wake_up(&mdev->misc_wait);
4213 static int got_IsInSync(struct drbd_conf *mdev, struct p_header80 *h)
4215 struct p_block_ack *p = (struct p_block_ack *)h;
4216 sector_t sector = be64_to_cpu(p->sector);
4217 int blksize = be32_to_cpu(p->blksize);
4219 D_ASSERT(mdev->agreed_pro_version >= 89);
4221 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4223 if (get_ldev(mdev)) {
4224 drbd_rs_complete_io(mdev, sector);
4225 drbd_set_in_sync(mdev, sector, blksize);
4226 /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */
4227 mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT);
4230 dec_rs_pending(mdev);
4231 atomic_add(blksize >> 9, &mdev->rs_sect_in);
4237 validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector,
4238 struct rb_root *root, const char *func,
4239 enum drbd_req_event what, bool missing_ok)
4241 struct drbd_request *req;
4242 struct bio_and_error m;
4244 spin_lock_irq(&mdev->req_lock);
4245 req = find_request(mdev, root, id, sector, missing_ok, func);
4246 if (unlikely(!req)) {
4247 spin_unlock_irq(&mdev->req_lock);
4250 __req_mod(req, what, &m);
4251 spin_unlock_irq(&mdev->req_lock);
4254 complete_master_bio(mdev, &m);
4258 static int got_BlockAck(struct drbd_conf *mdev, struct p_header80 *h)
4260 struct p_block_ack *p = (struct p_block_ack *)h;
4261 sector_t sector = be64_to_cpu(p->sector);
4262 int blksize = be32_to_cpu(p->blksize);
4263 enum drbd_req_event what;
4265 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4267 if (p->block_id == ID_SYNCER) {
4268 drbd_set_in_sync(mdev, sector, blksize);
4269 dec_rs_pending(mdev);
4272 switch (be16_to_cpu(h->command)) {
4273 case P_RS_WRITE_ACK:
4274 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4275 what = WRITE_ACKED_BY_PEER_AND_SIS;
4278 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4279 what = WRITE_ACKED_BY_PEER;
4282 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B);
4283 what = RECV_ACKED_BY_PEER;
4286 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4287 what = CONFLICT_DISCARDED_BY_PEER;
4294 return validate_req_change_req_state(mdev, p->block_id, sector,
4295 &mdev->write_requests, __func__,
4299 static int got_NegAck(struct drbd_conf *mdev, struct p_header80 *h)
4301 struct p_block_ack *p = (struct p_block_ack *)h;
4302 sector_t sector = be64_to_cpu(p->sector);
4303 int size = be32_to_cpu(p->blksize);
4304 bool missing_ok = mdev->net_conf->wire_protocol == DRBD_PROT_A ||
4305 mdev->net_conf->wire_protocol == DRBD_PROT_B;
4308 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4310 if (p->block_id == ID_SYNCER) {
4311 dec_rs_pending(mdev);
4312 drbd_rs_failed_io(mdev, sector, size);
4316 found = validate_req_change_req_state(mdev, p->block_id, sector,
4317 &mdev->write_requests, __func__,
4318 NEG_ACKED, missing_ok);
4320 /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs.
4321 The master bio might already be completed, therefore the
4322 request is no longer in the collision hash. */
4323 /* In Protocol B we might already have got a P_RECV_ACK
4324 but then get a P_NEG_ACK afterwards. */
4327 drbd_set_out_of_sync(mdev, sector, size);
4332 static int got_NegDReply(struct drbd_conf *mdev, struct p_header80 *h)
4334 struct p_block_ack *p = (struct p_block_ack *)h;
4335 sector_t sector = be64_to_cpu(p->sector);
4337 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4338 dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n",
4339 (unsigned long long)sector, be32_to_cpu(p->blksize));
4341 return validate_req_change_req_state(mdev, p->block_id, sector,
4342 &mdev->read_requests, __func__,
4346 static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header80 *h)
4350 struct p_block_ack *p = (struct p_block_ack *)h;
4352 sector = be64_to_cpu(p->sector);
4353 size = be32_to_cpu(p->blksize);
4355 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4357 dec_rs_pending(mdev);
4359 if (get_ldev_if_state(mdev, D_FAILED)) {
4360 drbd_rs_complete_io(mdev, sector);
4361 switch (be16_to_cpu(h->command)) {
4362 case P_NEG_RS_DREPLY:
4363 drbd_rs_failed_io(mdev, sector, size);
4377 static int got_BarrierAck(struct drbd_conf *mdev, struct p_header80 *h)
4379 struct p_barrier_ack *p = (struct p_barrier_ack *)h;
4381 tl_release(mdev, p->barrier, be32_to_cpu(p->set_size));
4383 if (mdev->state.conn == C_AHEAD &&
4384 atomic_read(&mdev->ap_in_flight) == 0 &&
4385 !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) {
4386 mdev->start_resync_timer.expires = jiffies + HZ;
4387 add_timer(&mdev->start_resync_timer);
4393 static int got_OVResult(struct drbd_conf *mdev, struct p_header80 *h)
4395 struct p_block_ack *p = (struct p_block_ack *)h;
4396 struct drbd_work *w;
4400 sector = be64_to_cpu(p->sector);
4401 size = be32_to_cpu(p->blksize);
4403 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4405 if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC)
4406 drbd_ov_oos_found(mdev, sector, size);
4410 if (!get_ldev(mdev))
4413 drbd_rs_complete_io(mdev, sector);
4414 dec_rs_pending(mdev);
4418 /* let's advance progress step marks only for every other megabyte */
4419 if ((mdev->ov_left & 0x200) == 0x200)
4420 drbd_advance_rs_marks(mdev, mdev->ov_left);
4422 if (mdev->ov_left == 0) {
4423 w = kmalloc(sizeof(*w), GFP_NOIO);
4425 w->cb = w_ov_finished;
4426 drbd_queue_work_front(&mdev->data.work, w);
4428 dev_err(DEV, "kmalloc(w) failed.");
4430 drbd_resync_finished(mdev);
4437 static int got_skip(struct drbd_conf *mdev, struct p_header80 *h)
4442 struct asender_cmd {
4444 int (*process)(struct drbd_conf *mdev, struct p_header80 *h);
4447 static struct asender_cmd *get_asender_cmd(int cmd)
4449 static struct asender_cmd asender_tbl[] = {
4450 /* anything missing from this table is in
4451 * the drbd_cmd_handler (drbd_default_handler) table,
4452 * see the beginning of drbdd() */
4453 [P_PING] = { sizeof(struct p_header80), got_Ping },
4454 [P_PING_ACK] = { sizeof(struct p_header80), got_PingAck },
4455 [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4456 [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4457 [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4458 [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4459 [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck },
4460 [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply },
4461 [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply},
4462 [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult },
4463 [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck },
4464 [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply },
4465 [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync },
4466 [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip },
4467 [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply},
4468 [P_MAX_CMD] = { 0, NULL },
4470 if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL)
4472 return &asender_tbl[cmd];
4475 int drbd_asender(struct drbd_thread *thi)
4477 struct drbd_conf *mdev = thi->mdev;
4478 struct p_header80 *h = &mdev->meta.rbuf.header.h80;
4479 struct asender_cmd *cmd = NULL;
4484 int expect = sizeof(struct p_header80);
4486 int ping_timeout_active = 0;
4488 sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev));
4490 current->policy = SCHED_RR; /* Make this a realtime task! */
4491 current->rt_priority = 2; /* more important than all other tasks */
4493 while (get_t_state(thi) == Running) {
4494 drbd_thread_current_set_cpu(mdev);
4495 if (test_and_clear_bit(SEND_PING, &mdev->flags)) {
4496 ERR_IF(!drbd_send_ping(mdev)) goto reconnect;
4497 mdev->meta.socket->sk->sk_rcvtimeo =
4498 mdev->net_conf->ping_timeo*HZ/10;
4499 ping_timeout_active = 1;
4502 /* conditionally cork;
4503 * it may hurt latency if we cork without much to send */
4504 if (!mdev->net_conf->no_cork &&
4505 3 < atomic_read(&mdev->unacked_cnt))
4506 drbd_tcp_cork(mdev->meta.socket);
4508 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4509 flush_signals(current);
4510 if (!drbd_process_done_ee(mdev))
4512 /* to avoid race with newly queued ACKs */
4513 set_bit(SIGNAL_ASENDER, &mdev->flags);
4514 spin_lock_irq(&mdev->req_lock);
4515 empty = list_empty(&mdev->done_ee);
4516 spin_unlock_irq(&mdev->req_lock);
4517 /* new ack may have been queued right here,
4518 * but then there is also a signal pending,
4519 * and we start over... */
4523 /* but unconditionally uncork unless disabled */
4524 if (!mdev->net_conf->no_cork)
4525 drbd_tcp_uncork(mdev->meta.socket);
4527 /* short circuit, recv_msg would return EINTR anyways. */
4528 if (signal_pending(current))
4531 rv = drbd_recv_short(mdev, mdev->meta.socket,
4532 buf, expect-received, 0);
4533 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4535 flush_signals(current);
4538 * -EINTR (on meta) we got a signal
4539 * -EAGAIN (on meta) rcvtimeo expired
4540 * -ECONNRESET other side closed the connection
4541 * -ERESTARTSYS (on data) we got a signal
4542 * rv < 0 other than above: unexpected error!
4543 * rv == expected: full header or command
4544 * rv < expected: "woken" by signal during receive
4545 * rv == 0 : "connection shut down by peer"
4547 if (likely(rv > 0)) {
4550 } else if (rv == 0) {
4551 dev_err(DEV, "meta connection shut down by peer.\n");
4553 } else if (rv == -EAGAIN) {
4554 /* If the data socket received something meanwhile,
4555 * that is good enough: peer is still alive. */
4556 if (time_after(mdev->last_received,
4557 jiffies - mdev->meta.socket->sk->sk_rcvtimeo))
4559 if (ping_timeout_active) {
4560 dev_err(DEV, "PingAck did not arrive in time.\n");
4563 set_bit(SEND_PING, &mdev->flags);
4565 } else if (rv == -EINTR) {
4568 dev_err(DEV, "sock_recvmsg returned %d\n", rv);
4572 if (received == expect && cmd == NULL) {
4573 if (unlikely(h->magic != cpu_to_be32(DRBD_MAGIC))) {
4574 dev_err(DEV, "magic?? on meta m: 0x%08x c: %d l: %d\n",
4575 be32_to_cpu(h->magic),
4576 be16_to_cpu(h->command),
4577 be16_to_cpu(h->length));
4580 cmd = get_asender_cmd(be16_to_cpu(h->command));
4581 len = be16_to_cpu(h->length);
4582 if (unlikely(cmd == NULL)) {
4583 dev_err(DEV, "unknown command?? on meta m: 0x%08x c: %d l: %d\n",
4584 be32_to_cpu(h->magic),
4585 be16_to_cpu(h->command),
4586 be16_to_cpu(h->length));
4589 expect = cmd->pkt_size;
4590 ERR_IF(len != expect-sizeof(struct p_header80))
4593 if (received == expect) {
4594 mdev->last_received = jiffies;
4595 D_ASSERT(cmd != NULL);
4596 if (!cmd->process(mdev, h))
4599 /* the idle_timeout (ping-int)
4600 * has been restored in got_PingAck() */
4601 if (cmd == get_asender_cmd(P_PING_ACK))
4602 ping_timeout_active = 0;
4606 expect = sizeof(struct p_header80);
4613 drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE));
4618 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
4621 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4623 D_ASSERT(mdev->state.conn < C_CONNECTED);
4624 dev_info(DEV, "asender terminated\n");