| /* |
| drbd_receiver.c |
| |
| This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
| |
| Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. |
| Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. |
| Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. |
| |
| drbd is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| drbd is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with drbd; see the file COPYING. If not, write to |
| the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| |
| #include <linux/module.h> |
| |
| #include <asm/uaccess.h> |
| #include <net/sock.h> |
| |
| #include <linux/drbd.h> |
| #include <linux/fs.h> |
| #include <linux/file.h> |
| #include <linux/in.h> |
| #include <linux/mm.h> |
| #include <linux/memcontrol.h> |
| #include <linux/mm_inline.h> |
| #include <linux/slab.h> |
| #include <linux/smp_lock.h> |
| #include <linux/pkt_sched.h> |
| #define __KERNEL_SYSCALLS__ |
| #include <linux/unistd.h> |
| #include <linux/vmalloc.h> |
| #include <linux/random.h> |
| #include <linux/string.h> |
| #include <linux/scatterlist.h> |
| #include "drbd_int.h" |
| #include "drbd_req.h" |
| |
| #include "drbd_vli.h" |
| |
| struct flush_work { |
| struct drbd_work w; |
| struct drbd_epoch *epoch; |
| }; |
| |
| enum finish_epoch { |
| FE_STILL_LIVE, |
| FE_DESTROYED, |
| FE_RECYCLED, |
| }; |
| |
| static int drbd_do_handshake(struct drbd_conf *mdev); |
| static int drbd_do_auth(struct drbd_conf *mdev); |
| |
| static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); |
| static int e_end_block(struct drbd_conf *, struct drbd_work *, int); |
| |
| static struct drbd_epoch *previous_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch) |
| { |
| struct drbd_epoch *prev; |
| spin_lock(&mdev->epoch_lock); |
| prev = list_entry(epoch->list.prev, struct drbd_epoch, list); |
| if (prev == epoch || prev == mdev->current_epoch) |
| prev = NULL; |
| spin_unlock(&mdev->epoch_lock); |
| return prev; |
| } |
| |
| #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) |
| |
| /* |
| * some helper functions to deal with single linked page lists, |
| * page->private being our "next" pointer. |
| */ |
| |
| /* If at least n pages are linked at head, get n pages off. |
| * Otherwise, don't modify head, and return NULL. |
| * Locking is the responsibility of the caller. |
| */ |
| static struct page *page_chain_del(struct page **head, int n) |
| { |
| struct page *page; |
| struct page *tmp; |
| |
| BUG_ON(!n); |
| BUG_ON(!head); |
| |
| page = *head; |
| |
| if (!page) |
| return NULL; |
| |
| while (page) { |
| tmp = page_chain_next(page); |
| if (--n == 0) |
| break; /* found sufficient pages */ |
| if (tmp == NULL) |
| /* insufficient pages, don't use any of them. */ |
| return NULL; |
| page = tmp; |
| } |
| |
| /* add end of list marker for the returned list */ |
| set_page_private(page, 0); |
| /* actual return value, and adjustment of head */ |
| page = *head; |
| *head = tmp; |
| return page; |
| } |
| |
| /* may be used outside of locks to find the tail of a (usually short) |
| * "private" page chain, before adding it back to a global chain head |
| * with page_chain_add() under a spinlock. */ |
| static struct page *page_chain_tail(struct page *page, int *len) |
| { |
| struct page *tmp; |
| int i = 1; |
| while ((tmp = page_chain_next(page))) |
| ++i, page = tmp; |
| if (len) |
| *len = i; |
| return page; |
| } |
| |
| static int page_chain_free(struct page *page) |
| { |
| struct page *tmp; |
| int i = 0; |
| page_chain_for_each_safe(page, tmp) { |
| put_page(page); |
| ++i; |
| } |
| return i; |
| } |
| |
| static void page_chain_add(struct page **head, |
| struct page *chain_first, struct page *chain_last) |
| { |
| #if 1 |
| struct page *tmp; |
| tmp = page_chain_tail(chain_first, NULL); |
| BUG_ON(tmp != chain_last); |
| #endif |
| |
| /* add chain to head */ |
| set_page_private(chain_last, (unsigned long)*head); |
| *head = chain_first; |
| } |
| |
| static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number) |
| { |
| struct page *page = NULL; |
| struct page *tmp = NULL; |
| int i = 0; |
| |
| /* Yes, testing drbd_pp_vacant outside the lock is racy. |
| * So what. It saves a spin_lock. */ |
| if (drbd_pp_vacant >= number) { |
| spin_lock(&drbd_pp_lock); |
| page = page_chain_del(&drbd_pp_pool, number); |
| if (page) |
| drbd_pp_vacant -= number; |
| spin_unlock(&drbd_pp_lock); |
| if (page) |
| return page; |
| } |
| |
| /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD |
| * "criss-cross" setup, that might cause write-out on some other DRBD, |
| * which in turn might block on the other node at this very place. */ |
| for (i = 0; i < number; i++) { |
| tmp = alloc_page(GFP_TRY); |
| if (!tmp) |
| break; |
| set_page_private(tmp, (unsigned long)page); |
| page = tmp; |
| } |
| |
| if (i == number) |
| return page; |
| |
| /* Not enough pages immediately available this time. |
| * No need to jump around here, drbd_pp_alloc will retry this |
| * function "soon". */ |
| if (page) { |
| tmp = page_chain_tail(page, NULL); |
| spin_lock(&drbd_pp_lock); |
| page_chain_add(&drbd_pp_pool, page, tmp); |
| drbd_pp_vacant += i; |
| spin_unlock(&drbd_pp_lock); |
| } |
| return NULL; |
| } |
| |
| /* kick lower level device, if we have more than (arbitrary number) |
| * reference counts on it, which typically are locally submitted io |
| * requests. don't use unacked_cnt, so we speed up proto A and B, too. */ |
| static void maybe_kick_lo(struct drbd_conf *mdev) |
| { |
| if (atomic_read(&mdev->local_cnt) >= mdev->net_conf->unplug_watermark) |
| drbd_kick_lo(mdev); |
| } |
| |
| static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed) |
| { |
| struct drbd_epoch_entry *e; |
| struct list_head *le, *tle; |
| |
| /* The EEs are always appended to the end of the list. Since |
| they are sent in order over the wire, they have to finish |
| in order. As soon as we see the first not finished we can |
| stop to examine the list... */ |
| |
| list_for_each_safe(le, tle, &mdev->net_ee) { |
| e = list_entry(le, struct drbd_epoch_entry, w.list); |
| if (drbd_ee_has_active_page(e)) |
| break; |
| list_move(le, to_be_freed); |
| } |
| } |
| |
| static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) |
| { |
| LIST_HEAD(reclaimed); |
| struct drbd_epoch_entry *e, *t; |
| |
| maybe_kick_lo(mdev); |
| spin_lock_irq(&mdev->req_lock); |
| reclaim_net_ee(mdev, &reclaimed); |
| spin_unlock_irq(&mdev->req_lock); |
| |
| list_for_each_entry_safe(e, t, &reclaimed, w.list) |
| drbd_free_ee(mdev, e); |
| } |
| |
| /** |
| * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled) |
| * @mdev: DRBD device. |
| * @number: number of pages requested |
| * @retry: whether to retry, if not enough pages are available right now |
| * |
| * Tries to allocate number pages, first from our own page pool, then from |
| * the kernel, unless this allocation would exceed the max_buffers setting. |
| * Possibly retry until DRBD frees sufficient pages somewhere else. |
| * |
| * Returns a page chain linked via page->private. |
| */ |
| static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry) |
| { |
| struct page *page = NULL; |
| DEFINE_WAIT(wait); |
| |
| /* Yes, we may run up to @number over max_buffers. If we |
| * follow it strictly, the admin will get it wrong anyways. */ |
| if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) |
| page = drbd_pp_first_pages_or_try_alloc(mdev, number); |
| |
| while (page == NULL) { |
| prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); |
| |
| drbd_kick_lo_and_reclaim_net(mdev); |
| |
| if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) { |
| page = drbd_pp_first_pages_or_try_alloc(mdev, number); |
| if (page) |
| break; |
| } |
| |
| if (!retry) |
| break; |
| |
| if (signal_pending(current)) { |
| dev_warn(DEV, "drbd_pp_alloc interrupted!\n"); |
| break; |
| } |
| |
| schedule(); |
| } |
| finish_wait(&drbd_pp_wait, &wait); |
| |
| if (page) |
| atomic_add(number, &mdev->pp_in_use); |
| return page; |
| } |
| |
| /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc. |
| * Is also used from inside an other spin_lock_irq(&mdev->req_lock); |
| * Either links the page chain back to the global pool, |
| * or returns all pages to the system. */ |
| static void drbd_pp_free(struct drbd_conf *mdev, struct page *page) |
| { |
| int i; |
| if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count) |
| i = page_chain_free(page); |
| else { |
| struct page *tmp; |
| tmp = page_chain_tail(page, &i); |
| spin_lock(&drbd_pp_lock); |
| page_chain_add(&drbd_pp_pool, page, tmp); |
| drbd_pp_vacant += i; |
| spin_unlock(&drbd_pp_lock); |
| } |
| atomic_sub(i, &mdev->pp_in_use); |
| i = atomic_read(&mdev->pp_in_use); |
| if (i < 0) |
| dev_warn(DEV, "ASSERTION FAILED: pp_in_use: %d < 0\n", i); |
| wake_up(&drbd_pp_wait); |
| } |
| |
| /* |
| You need to hold the req_lock: |
| _drbd_wait_ee_list_empty() |
| |
| You must not have the req_lock: |
| drbd_free_ee() |
| drbd_alloc_ee() |
| drbd_init_ee() |
| drbd_release_ee() |
| drbd_ee_fix_bhs() |
| drbd_process_done_ee() |
| drbd_clear_done_ee() |
| drbd_wait_ee_list_empty() |
| */ |
| |
| struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev, |
| u64 id, |
| sector_t sector, |
| unsigned int data_size, |
| gfp_t gfp_mask) __must_hold(local) |
| { |
| struct drbd_epoch_entry *e; |
| struct page *page; |
| unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; |
| |
| if (FAULT_ACTIVE(mdev, DRBD_FAULT_AL_EE)) |
| return NULL; |
| |
| e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); |
| if (!e) { |
| if (!(gfp_mask & __GFP_NOWARN)) |
| dev_err(DEV, "alloc_ee: Allocation of an EE failed\n"); |
| return NULL; |
| } |
| |
| page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); |
| if (!page) |
| goto fail; |
| |
| INIT_HLIST_NODE(&e->colision); |
| e->epoch = NULL; |
| e->mdev = mdev; |
| e->pages = page; |
| atomic_set(&e->pending_bios, 0); |
| e->size = data_size; |
| e->flags = 0; |
| e->sector = sector; |
| e->sector = sector; |
| e->block_id = id; |
| |
| return e; |
| |
| fail: |
| mempool_free(e, drbd_ee_mempool); |
| return NULL; |
| } |
| |
| void drbd_free_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e) |
| { |
| drbd_pp_free(mdev, e->pages); |
| D_ASSERT(atomic_read(&e->pending_bios) == 0); |
| D_ASSERT(hlist_unhashed(&e->colision)); |
| mempool_free(e, drbd_ee_mempool); |
| } |
| |
| int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list) |
| { |
| LIST_HEAD(work_list); |
| struct drbd_epoch_entry *e, *t; |
| int count = 0; |
| |
| spin_lock_irq(&mdev->req_lock); |
| list_splice_init(list, &work_list); |
| spin_unlock_irq(&mdev->req_lock); |
| |
| list_for_each_entry_safe(e, t, &work_list, w.list) { |
| drbd_free_ee(mdev, e); |
| count++; |
| } |
| return count; |
| } |
| |
| |
| /* |
| * This function is called from _asender only_ |
| * but see also comments in _req_mod(,barrier_acked) |
| * and receive_Barrier. |
| * |
| * Move entries from net_ee to done_ee, if ready. |
| * Grab done_ee, call all callbacks, free the entries. |
| * The callbacks typically send out ACKs. |
| */ |
| static int drbd_process_done_ee(struct drbd_conf *mdev) |
| { |
| LIST_HEAD(work_list); |
| LIST_HEAD(reclaimed); |
| struct drbd_epoch_entry *e, *t; |
| int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS); |
| |
| spin_lock_irq(&mdev->req_lock); |
| reclaim_net_ee(mdev, &reclaimed); |
| list_splice_init(&mdev->done_ee, &work_list); |
| spin_unlock_irq(&mdev->req_lock); |
| |
| list_for_each_entry_safe(e, t, &reclaimed, w.list) |
| drbd_free_ee(mdev, e); |
| |
| /* possible callbacks here: |
| * e_end_block, and e_end_resync_block, e_send_discard_ack. |
| * all ignore the last argument. |
| */ |
| list_for_each_entry_safe(e, t, &work_list, w.list) { |
| /* list_del not necessary, next/prev members not touched */ |
| ok = e->w.cb(mdev, &e->w, !ok) && ok; |
| drbd_free_ee(mdev, e); |
| } |
| wake_up(&mdev->ee_wait); |
| |
| return ok; |
| } |
| |
| void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) |
| { |
| DEFINE_WAIT(wait); |
| |
| /* avoids spin_lock/unlock |
| * and calling prepare_to_wait in the fast path */ |
| while (!list_empty(head)) { |
| prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); |
| spin_unlock_irq(&mdev->req_lock); |
| drbd_kick_lo(mdev); |
| schedule(); |
| finish_wait(&mdev->ee_wait, &wait); |
| spin_lock_irq(&mdev->req_lock); |
| } |
| } |
| |
| void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) |
| { |
| spin_lock_irq(&mdev->req_lock); |
| _drbd_wait_ee_list_empty(mdev, head); |
| spin_unlock_irq(&mdev->req_lock); |
| } |
| |
| /* see also kernel_accept; which is only present since 2.6.18. |
| * also we want to log which part of it failed, exactly */ |
| static int drbd_accept(struct drbd_conf *mdev, const char **what, |
| struct socket *sock, struct socket **newsock) |
| { |
| struct sock *sk = sock->sk; |
| int err = 0; |
| |
| *what = "listen"; |
| err = sock->ops->listen(sock, 5); |
| if (err < 0) |
| goto out; |
| |
| *what = "sock_create_lite"; |
| err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, |
| newsock); |
| if (err < 0) |
| goto out; |
| |
| *what = "accept"; |
| err = sock->ops->accept(sock, *newsock, 0); |
| if (err < 0) { |
| sock_release(*newsock); |
| *newsock = NULL; |
| goto out; |
| } |
| (*newsock)->ops = sock->ops; |
| |
| out: |
| return err; |
| } |
| |
| static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock, |
| void *buf, size_t size, int flags) |
| { |
| mm_segment_t oldfs; |
| struct kvec iov = { |
| .iov_base = buf, |
| .iov_len = size, |
| }; |
| struct msghdr msg = { |
| .msg_iovlen = 1, |
| .msg_iov = (struct iovec *)&iov, |
| .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) |
| }; |
| int rv; |
| |
| oldfs = get_fs(); |
| set_fs(KERNEL_DS); |
| rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); |
| set_fs(oldfs); |
| |
| return rv; |
| } |
| |
| static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size) |
| { |
| mm_segment_t oldfs; |
| struct kvec iov = { |
| .iov_base = buf, |
| .iov_len = size, |
| }; |
| struct msghdr msg = { |
| .msg_iovlen = 1, |
| .msg_iov = (struct iovec *)&iov, |
| .msg_flags = MSG_WAITALL | MSG_NOSIGNAL |
| }; |
| int rv; |
| |
| oldfs = get_fs(); |
| set_fs(KERNEL_DS); |
| |
| for (;;) { |
| rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags); |
| if (rv == size) |
| break; |
| |
| /* Note: |
| * ECONNRESET other side closed the connection |
| * ERESTARTSYS (on sock) we got a signal |
| */ |
| |
| if (rv < 0) { |
| if (rv == -ECONNRESET) |
| dev_info(DEV, "sock was reset by peer\n"); |
| else if (rv != -ERESTARTSYS) |
| dev_err(DEV, "sock_recvmsg returned %d\n", rv); |
| break; |
| } else if (rv == 0) { |
| dev_info(DEV, "sock was shut down by peer\n"); |
| break; |
| } else { |
| /* signal came in, or peer/link went down, |
| * after we read a partial message |
| */ |
| /* D_ASSERT(signal_pending(current)); */ |
| break; |
| } |
| }; |
| |
| set_fs(oldfs); |
| |
| if (rv != size) |
| drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); |
| |
| return rv; |
| } |
| |
| /* quoting tcp(7): |
| * On individual connections, the socket buffer size must be set prior to the |
| * listen(2) or connect(2) calls in order to have it take effect. |
| * This is our wrapper to do so. |
| */ |
| static void drbd_setbufsize(struct socket *sock, unsigned int snd, |
| unsigned int rcv) |
| { |
| /* open coded SO_SNDBUF, SO_RCVBUF */ |
| if (snd) { |
| sock->sk->sk_sndbuf = snd; |
| sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
| } |
| if (rcv) { |
| sock->sk->sk_rcvbuf = rcv; |
| sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| } |
| } |
| |
| static struct socket *drbd_try_connect(struct drbd_conf *mdev) |
| { |
| const char *what; |
| struct socket *sock; |
| struct sockaddr_in6 src_in6; |
| int err; |
| int disconnect_on_error = 1; |
| |
| if (!get_net_conf(mdev)) |
| return NULL; |
| |
| what = "sock_create_kern"; |
| err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, |
| SOCK_STREAM, IPPROTO_TCP, &sock); |
| if (err < 0) { |
| sock = NULL; |
| goto out; |
| } |
| |
| sock->sk->sk_rcvtimeo = |
| sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ; |
| drbd_setbufsize(sock, mdev->net_conf->sndbuf_size, |
| mdev->net_conf->rcvbuf_size); |
| |
| /* explicitly bind to the configured IP as source IP |
| * for the outgoing connections. |
| * This is needed for multihomed hosts and to be |
| * able to use lo: interfaces for drbd. |
| * Make sure to use 0 as port number, so linux selects |
| * a free one dynamically. |
| */ |
| memcpy(&src_in6, mdev->net_conf->my_addr, |
| min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6))); |
| if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6) |
| src_in6.sin6_port = 0; |
| else |
| ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ |
| |
| what = "bind before connect"; |
| err = sock->ops->bind(sock, |
| (struct sockaddr *) &src_in6, |
| mdev->net_conf->my_addr_len); |
| if (err < 0) |
| goto out; |
| |
| /* connect may fail, peer not yet available. |
| * stay C_WF_CONNECTION, don't go Disconnecting! */ |
| disconnect_on_error = 0; |
| what = "connect"; |
| err = sock->ops->connect(sock, |
| (struct sockaddr *)mdev->net_conf->peer_addr, |
| mdev->net_conf->peer_addr_len, 0); |
| |
| out: |
| if (err < 0) { |
| if (sock) { |
| sock_release(sock); |
| sock = NULL; |
| } |
| switch (-err) { |
| /* timeout, busy, signal pending */ |
| case ETIMEDOUT: case EAGAIN: case EINPROGRESS: |
| case EINTR: case ERESTARTSYS: |
| /* peer not (yet) available, network problem */ |
| case ECONNREFUSED: case ENETUNREACH: |
| case EHOSTDOWN: case EHOSTUNREACH: |
| disconnect_on_error = 0; |
| break; |
| default: |
| dev_err(DEV, "%s failed, err = %d\n", what, err); |
| } |
| if (disconnect_on_error) |
| drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| } |
| put_net_conf(mdev); |
| return sock; |
| } |
| |
| static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev) |
| { |
| int timeo, err; |
| struct socket *s_estab = NULL, *s_listen; |
| const char *what; |
| |
| if (!get_net_conf(mdev)) |
| return NULL; |
| |
| what = "sock_create_kern"; |
| err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, |
| SOCK_STREAM, IPPROTO_TCP, &s_listen); |
| if (err) { |
| s_listen = NULL; |
| goto out; |
| } |
| |
| timeo = mdev->net_conf->try_connect_int * HZ; |
| timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ |
| |
| s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ |
| s_listen->sk->sk_rcvtimeo = timeo; |
| s_listen->sk->sk_sndtimeo = timeo; |
| drbd_setbufsize(s_listen, mdev->net_conf->sndbuf_size, |
| mdev->net_conf->rcvbuf_size); |
| |
| what = "bind before listen"; |
| err = s_listen->ops->bind(s_listen, |
| (struct sockaddr *) mdev->net_conf->my_addr, |
| mdev->net_conf->my_addr_len); |
| if (err < 0) |
| goto out; |
| |
| err = drbd_accept(mdev, &what, s_listen, &s_estab); |
| |
| out: |
| if (s_listen) |
| sock_release(s_listen); |
| if (err < 0) { |
| if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { |
| dev_err(DEV, "%s failed, err = %d\n", what, err); |
| drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| } |
| } |
| put_net_conf(mdev); |
| |
| return s_estab; |
| } |
| |
| static int drbd_send_fp(struct drbd_conf *mdev, |
| struct socket *sock, enum drbd_packets cmd) |
| { |
| struct p_header *h = (struct p_header *) &mdev->data.sbuf.header; |
| |
| return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0); |
| } |
| |
| static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock) |
| { |
| struct p_header *h = (struct p_header *) &mdev->data.sbuf.header; |
| int rr; |
| |
| rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0); |
| |
| if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC) |
| return be16_to_cpu(h->command); |
| |
| return 0xffff; |
| } |
| |
| /** |
| * drbd_socket_okay() - Free the socket if its connection is not okay |
| * @mdev: DRBD device. |
| * @sock: pointer to the pointer to the socket. |
| */ |
| static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock) |
| { |
| int rr; |
| char tb[4]; |
| |
| if (!*sock) |
| return FALSE; |
| |
| rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); |
| |
| if (rr > 0 || rr == -EAGAIN) { |
| return TRUE; |
| } else { |
| sock_release(*sock); |
| *sock = NULL; |
| return FALSE; |
| } |
| } |
| |
| /* |
| * return values: |
| * 1 yes, we have a valid connection |
| * 0 oops, did not work out, please try again |
| * -1 peer talks different language, |
| * no point in trying again, please go standalone. |
| * -2 We do not have a network config... |
| */ |
| static int drbd_connect(struct drbd_conf *mdev) |
| { |
| struct socket *s, *sock, *msock; |
| int try, h, ok; |
| |
| D_ASSERT(!mdev->data.socket); |
| |
| if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS) |
| return -2; |
| |
| clear_bit(DISCARD_CONCURRENT, &mdev->flags); |
| |
| sock = NULL; |
| msock = NULL; |
| |
| do { |
| for (try = 0;;) { |
| /* 3 tries, this should take less than a second! */ |
| s = drbd_try_connect(mdev); |
| if (s || ++try >= 3) |
| break; |
| /* give the other side time to call bind() & listen() */ |
| __set_current_state(TASK_INTERRUPTIBLE); |
| schedule_timeout(HZ / 10); |
| } |
| |
| if (s) { |
| if (!sock) { |
| drbd_send_fp(mdev, s, P_HAND_SHAKE_S); |
| sock = s; |
| s = NULL; |
| } else if (!msock) { |
| drbd_send_fp(mdev, s, P_HAND_SHAKE_M); |
| msock = s; |
| s = NULL; |
| } else { |
| dev_err(DEV, "Logic error in drbd_connect()\n"); |
| goto out_release_sockets; |
| } |
| } |
| |
| if (sock && msock) { |
| __set_current_state(TASK_INTERRUPTIBLE); |
| schedule_timeout(HZ / 10); |
| ok = drbd_socket_okay(mdev, &sock); |
| ok = drbd_socket_okay(mdev, &msock) && ok; |
| if (ok) |
| break; |
| } |
| |
| retry: |
| s = drbd_wait_for_connect(mdev); |
| if (s) { |
| try = drbd_recv_fp(mdev, s); |
| drbd_socket_okay(mdev, &sock); |
| drbd_socket_okay(mdev, &msock); |
| switch (try) { |
| case P_HAND_SHAKE_S: |
| if (sock) { |
| dev_warn(DEV, "initial packet S crossed\n"); |
| sock_release(sock); |
| } |
| sock = s; |
| break; |
| case P_HAND_SHAKE_M: |
| if (msock) { |
| dev_warn(DEV, "initial packet M crossed\n"); |
| sock_release(msock); |
| } |
| msock = s; |
| set_bit(DISCARD_CONCURRENT, &mdev->flags); |
| break; |
| default: |
| dev_warn(DEV, "Error receiving initial packet\n"); |
| sock_release(s); |
| if (random32() & 1) |
| goto retry; |
| } |
| } |
| |
| if (mdev->state.conn <= C_DISCONNECTING) |
| goto out_release_sockets; |
| if (signal_pending(current)) { |
| flush_signals(current); |
| smp_rmb(); |
| if (get_t_state(&mdev->receiver) == Exiting) |
| goto out_release_sockets; |
| } |
| |
| if (sock && msock) { |
| ok = drbd_socket_okay(mdev, &sock); |
| ok = drbd_socket_okay(mdev, &msock) && ok; |
| if (ok) |
| break; |
| } |
| } while (1); |
| |
| msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ |
| sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ |
| |
| sock->sk->sk_allocation = GFP_NOIO; |
| msock->sk->sk_allocation = GFP_NOIO; |
| |
| sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; |
| msock->sk->sk_priority = TC_PRIO_INTERACTIVE; |
| |
| /* NOT YET ... |
| * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; |
| * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
| * first set it to the P_HAND_SHAKE timeout, |
| * which we set to 4x the configured ping_timeout. */ |
| sock->sk->sk_sndtimeo = |
| sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10; |
| |
| msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; |
| msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; |
| |
| /* we don't want delays. |
| * we use TCP_CORK where apropriate, though */ |
| drbd_tcp_nodelay(sock); |
| drbd_tcp_nodelay(msock); |
| |
| mdev->data.socket = sock; |
| mdev->meta.socket = msock; |
| mdev->last_received = jiffies; |
| |
| D_ASSERT(mdev->asender.task == NULL); |
| |
| h = drbd_do_handshake(mdev); |
| if (h <= 0) |
| return h; |
| |
| if (mdev->cram_hmac_tfm) { |
| /* drbd_request_state(mdev, NS(conn, WFAuth)); */ |
| switch (drbd_do_auth(mdev)) { |
| case -1: |
| dev_err(DEV, "Authentication of peer failed\n"); |
| return -1; |
| case 0: |
| dev_err(DEV, "Authentication of peer failed, trying again.\n"); |
| return 0; |
| } |
| } |
| |
| if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS) |
| return 0; |
| |
| sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; |
| sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
| |
| atomic_set(&mdev->packet_seq, 0); |
| mdev->peer_seq = 0; |
| |
| drbd_thread_start(&mdev->asender); |
| |
| if (!drbd_send_protocol(mdev)) |
| return -1; |
| drbd_send_sync_param(mdev, &mdev->sync_conf); |
| drbd_send_sizes(mdev, 0, 0); |
| drbd_send_uuids(mdev); |
| drbd_send_state(mdev); |
| clear_bit(USE_DEGR_WFC_T, &mdev->flags); |
| clear_bit(RESIZE_PENDING, &mdev->flags); |
| |
| return 1; |
| |
| out_release_sockets: |
| if (sock) |
| sock_release(sock); |
| if (msock) |
| sock_release(msock); |
| return -1; |
| } |
| |
| static int drbd_recv_header(struct drbd_conf *mdev, struct p_header *h) |
| { |
| int r; |
| |
| r = drbd_recv(mdev, h, sizeof(*h)); |
| |
| if (unlikely(r != sizeof(*h))) { |
| dev_err(DEV, "short read expecting header on sock: r=%d\n", r); |
| return FALSE; |
| }; |
| h->command = be16_to_cpu(h->command); |
| h->length = be16_to_cpu(h->length); |
| if (unlikely(h->magic != BE_DRBD_MAGIC)) { |
| dev_err(DEV, "magic?? on data m: 0x%lx c: %d l: %d\n", |
| (long)be32_to_cpu(h->magic), |
| h->command, h->length); |
| return FALSE; |
| } |
| mdev->last_received = jiffies; |
| |
| return TRUE; |
| } |
| |
| static enum finish_epoch drbd_flush_after_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch) |
| { |
| int rv; |
| |
| if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { |
| rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, |
| NULL, BLKDEV_IFL_WAIT); |
| if (rv) { |
| dev_err(DEV, "local disk flush failed with status %d\n", rv); |
| /* would rather check on EOPNOTSUPP, but that is not reliable. |
| * don't try again for ANY return value != 0 |
| * if (rv == -EOPNOTSUPP) */ |
| drbd_bump_write_ordering(mdev, WO_drain_io); |
| } |
| put_ldev(mdev); |
| } |
| |
| return drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE); |
| } |
| |
| static int w_flush(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| { |
| struct flush_work *fw = (struct flush_work *)w; |
| struct drbd_epoch *epoch = fw->epoch; |
| |
| kfree(w); |
| |
| if (!test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags)) |
| drbd_flush_after_epoch(mdev, epoch); |
| |
| drbd_may_finish_epoch(mdev, epoch, EV_PUT | |
| (mdev->state.conn < C_CONNECTED ? EV_CLEANUP : 0)); |
| |
| return 1; |
| } |
| |
| /** |
| * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. |
| * @mdev: DRBD device. |
| * @epoch: Epoch object. |
| * @ev: Epoch event. |
| */ |
| static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, |
| struct drbd_epoch *epoch, |
| enum epoch_event ev) |
| { |
| int finish, epoch_size; |
| struct drbd_epoch *next_epoch; |
| int schedule_flush = 0; |
| enum finish_epoch rv = FE_STILL_LIVE; |
| |
| spin_lock(&mdev->epoch_lock); |
| do { |
| next_epoch = NULL; |
| finish = 0; |
| |
| epoch_size = atomic_read(&epoch->epoch_size); |
| |
| switch (ev & ~EV_CLEANUP) { |
| case EV_PUT: |
| atomic_dec(&epoch->active); |
| break; |
| case EV_GOT_BARRIER_NR: |
| set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); |
| |
| /* Special case: If we just switched from WO_bio_barrier to |
| WO_bdev_flush we should not finish the current epoch */ |
| if (test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags) && epoch_size == 1 && |
| mdev->write_ordering != WO_bio_barrier && |
| epoch == mdev->current_epoch) |
| clear_bit(DE_CONTAINS_A_BARRIER, &epoch->flags); |
| break; |
| case EV_BARRIER_DONE: |
| set_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags); |
| break; |
| case EV_BECAME_LAST: |
| /* nothing to do*/ |
| break; |
| } |
| |
| if (epoch_size != 0 && |
| atomic_read(&epoch->active) == 0 && |
| test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) && |
| epoch->list.prev == &mdev->current_epoch->list && |
| !test_bit(DE_IS_FINISHING, &epoch->flags)) { |
| /* Nearly all conditions are met to finish that epoch... */ |
| if (test_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags) || |
| mdev->write_ordering == WO_none || |
| (epoch_size == 1 && test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) || |
| ev & EV_CLEANUP) { |
| finish = 1; |
| set_bit(DE_IS_FINISHING, &epoch->flags); |
| } else if (!test_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags) && |
| mdev->write_ordering == WO_bio_barrier) { |
| atomic_inc(&epoch->active); |
| schedule_flush = 1; |
| } |
| } |
| if (finish) { |
| if (!(ev & EV_CLEANUP)) { |
| spin_unlock(&mdev->epoch_lock); |
| drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); |
| spin_lock(&mdev->epoch_lock); |
| } |
| dec_unacked(mdev); |
| |
| if (mdev->current_epoch != epoch) { |
| next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); |
| list_del(&epoch->list); |
| ev = EV_BECAME_LAST | (ev & EV_CLEANUP); |
| mdev->epochs--; |
| kfree(epoch); |
| |
| if (rv == FE_STILL_LIVE) |
| rv = FE_DESTROYED; |
| } else { |
| epoch->flags = 0; |
| atomic_set(&epoch->epoch_size, 0); |
| /* atomic_set(&epoch->active, 0); is already zero */ |
| if (rv == FE_STILL_LIVE) |
| rv = FE_RECYCLED; |
| } |
| } |
| |
| if (!next_epoch) |
| break; |
| |
| epoch = next_epoch; |
| } while (1); |
| |
| spin_unlock(&mdev->epoch_lock); |
| |
| if (schedule_flush) { |
| struct flush_work *fw; |
| fw = kmalloc(sizeof(*fw), GFP_ATOMIC); |
| if (fw) { |
| fw->w.cb = w_flush; |
| fw->epoch = epoch; |
| drbd_queue_work(&mdev->data.work, &fw->w); |
| } else { |
| dev_warn(DEV, "Could not kmalloc a flush_work obj\n"); |
| set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags); |
| /* That is not a recursion, only one level */ |
| drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE); |
| drbd_may_finish_epoch(mdev, epoch, EV_PUT); |
| } |
| } |
| |
| return rv; |
| } |
| |
| /** |
| * drbd_bump_write_ordering() - Fall back to an other write ordering method |
| * @mdev: DRBD device. |
| * @wo: Write ordering method to try. |
| */ |
| void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) |
| { |
| enum write_ordering_e pwo; |
| static char *write_ordering_str[] = { |
| [WO_none] = "none", |
| [WO_drain_io] = "drain", |
| [WO_bdev_flush] = "flush", |
| [WO_bio_barrier] = "barrier", |
| }; |
| |
| pwo = mdev->write_ordering; |
| wo = min(pwo, wo); |
| if (wo == WO_bio_barrier && mdev->ldev->dc.no_disk_barrier) |
| wo = WO_bdev_flush; |
| if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) |
| wo = WO_drain_io; |
| if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) |
| wo = WO_none; |
| mdev->write_ordering = wo; |
| if (pwo != mdev->write_ordering || wo == WO_bio_barrier) |
| dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); |
| } |
| |
| /** |
| * drbd_submit_ee() |
| * @mdev: DRBD device. |
| * @e: epoch entry |
| * @rw: flag field, see bio->bi_rw |
| */ |
| /* TODO allocate from our own bio_set. */ |
| int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, |
| const unsigned rw, const int fault_type) |
| { |
| struct bio *bios = NULL; |
| struct bio *bio; |
| struct page *page = e->pages; |
| sector_t sector = e->sector; |
| unsigned ds = e->size; |
| unsigned n_bios = 0; |
| unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; |
| |
| /* In most cases, we will only need one bio. But in case the lower |
| * level restrictions happen to be different at this offset on this |
| * side than those of the sending peer, we may need to submit the |
| * request in more than one bio. */ |
| next_bio: |
| bio = bio_alloc(GFP_NOIO, nr_pages); |
| if (!bio) { |
| dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); |
| goto fail; |
| } |
| /* > e->sector, unless this is the first bio */ |
| bio->bi_sector = sector; |
| bio->bi_bdev = mdev->ldev->backing_bdev; |
| /* we special case some flags in the multi-bio case, see below |
| * (REQ_UNPLUG, REQ_HARDBARRIER) */ |
| bio->bi_rw = rw; |
| bio->bi_private = e; |
| bio->bi_end_io = drbd_endio_sec; |
| |
| bio->bi_next = bios; |
| bios = bio; |
| ++n_bios; |
| |
| page_chain_for_each(page) { |
| unsigned len = min_t(unsigned, ds, PAGE_SIZE); |
| if (!bio_add_page(bio, page, len, 0)) { |
| /* a single page must always be possible! */ |
| BUG_ON(bio->bi_vcnt == 0); |
| goto next_bio; |
| } |
| ds -= len; |
| sector += len >> 9; |
| --nr_pages; |
| } |
| D_ASSERT(page == NULL); |
| D_ASSERT(ds == 0); |
| |
| atomic_set(&e->pending_bios, n_bios); |
| do { |
| bio = bios; |
| bios = bios->bi_next; |
| bio->bi_next = NULL; |
| |
| /* strip off REQ_UNPLUG unless it is the last bio */ |
| if (bios) |
| bio->bi_rw &= ~REQ_UNPLUG; |
| |
| drbd_generic_make_request(mdev, fault_type, bio); |
| |
| /* strip off REQ_HARDBARRIER, |
| * unless it is the first or last bio */ |
| if (bios && bios->bi_next) |
| bios->bi_rw &= ~REQ_HARDBARRIER; |
| } while (bios); |
| maybe_kick_lo(mdev); |
| return 0; |
| |
| fail: |
| while (bios) { |
| bio = bios; |
| bios = bios->bi_next; |
| bio_put(bio); |
| } |
| return -ENOMEM; |
| } |
| |
| /** |
| * w_e_reissue() - Worker callback; Resubmit a bio, without REQ_HARDBARRIER set |
| * @mdev: DRBD device. |
| * @w: work object. |
| * @cancel: The connection will be closed anyways (unused in this callback) |
| */ |
| int w_e_reissue(struct drbd_conf *mdev, struct drbd_work *w, int cancel) __releases(local) |
| { |
| struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; |
| /* We leave DE_CONTAINS_A_BARRIER and EE_IS_BARRIER in place, |
| (and DE_BARRIER_IN_NEXT_EPOCH_ISSUED in the previous Epoch) |
| so that we can finish that epoch in drbd_may_finish_epoch(). |
| That is necessary if we already have a long chain of Epochs, before |
| we realize that REQ_HARDBARRIER is actually not supported */ |
| |
| /* As long as the -ENOTSUPP on the barrier is reported immediately |
| that will never trigger. If it is reported late, we will just |
| print that warning and continue correctly for all future requests |
| with WO_bdev_flush */ |
| if (previous_epoch(mdev, e->epoch)) |
| dev_warn(DEV, "Write ordering was not enforced (one time event)\n"); |
| |
| /* we still have a local reference, |
| * get_ldev was done in receive_Data. */ |
| |
| e->w.cb = e_end_block; |
| if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_DT_WR) != 0) { |
| /* drbd_submit_ee fails for one reason only: |
| * if was not able to allocate sufficient bios. |
| * requeue, try again later. */ |
| e->w.cb = w_e_reissue; |
| drbd_queue_work(&mdev->data.work, &e->w); |
| } |
| return 1; |
| } |
| |
| static int receive_Barrier(struct drbd_conf *mdev, struct p_header *h) |
| { |
| int rv, issue_flush; |
| struct p_barrier *p = (struct p_barrier *)h; |
| struct drbd_epoch *epoch; |
| |
| ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; |
| |
| rv = drbd_recv(mdev, h->payload, h->length); |
| ERR_IF(rv != h->length) return FALSE; |
| |
| inc_unacked(mdev); |
| |
| if (mdev->net_conf->wire_protocol != DRBD_PROT_C) |
| drbd_kick_lo(mdev); |
| |
| mdev->current_epoch->barrier_nr = p->barrier; |
| rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); |
| |
| /* P_BARRIER_ACK may imply that the corresponding extent is dropped from |
| * the activity log, which means it would not be resynced in case the |
| * R_PRIMARY crashes now. |
| * Therefore we must send the barrier_ack after the barrier request was |
| * completed. */ |
| switch (mdev->write_ordering) { |
| case WO_bio_barrier: |
| case WO_none: |
| if (rv == FE_RECYCLED) |
| return TRUE; |
| break; |
| |
| case WO_bdev_flush: |
| case WO_drain_io: |
| if (rv == FE_STILL_LIVE) { |
| set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags); |
| drbd_wait_ee_list_empty(mdev, &mdev->active_ee); |
| rv = drbd_flush_after_epoch(mdev, mdev->current_epoch); |
| } |
| if (rv == FE_RECYCLED) |
| return TRUE; |
| |
| /* The asender will send all the ACKs and barrier ACKs out, since |
| all EEs moved from the active_ee to the done_ee. We need to |
| provide a new epoch object for the EEs that come in soon */ |
| break; |
| } |
| |
| /* receiver context, in the writeout path of the other node. |
| * avoid potential distributed deadlock */ |
| epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); |
| if (!epoch) { |
| dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); |
| issue_flush = !test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags); |
| drbd_wait_ee_list_empty(mdev, &mdev->active_ee); |
| if (issue_flush) { |
| rv = drbd_flush_after_epoch(mdev, mdev->current_epoch); |
| if (rv == FE_RECYCLED) |
| return TRUE; |
| } |
| |
| drbd_wait_ee_list_empty(mdev, &mdev->done_ee); |
| |
| return TRUE; |
| } |
| |
| epoch->flags = 0; |
| atomic_set(&epoch->epoch_size, 0); |
| atomic_set(&epoch->active, 0); |
| |
| spin_lock(&mdev->epoch_lock); |
| if (atomic_read(&mdev->current_epoch->epoch_size)) { |
| list_add(&epoch->list, &mdev->current_epoch->list); |
| mdev->current_epoch = epoch; |
| mdev->epochs++; |
| } else { |
| /* The current_epoch got recycled while we allocated this one... */ |
| kfree(epoch); |
| } |
| spin_unlock(&mdev->epoch_lock); |
| |
| return TRUE; |
| } |
| |
| /* used from receive_RSDataReply (recv_resync_read) |
| * and from receive_Data */ |
| static struct drbd_epoch_entry * |
| read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local) |
| { |
| const sector_t capacity = drbd_get_capacity(mdev->this_bdev); |
| struct drbd_epoch_entry *e; |
| struct page *page; |
| int dgs, ds, rr; |
| void *dig_in = mdev->int_dig_in; |
| void *dig_vv = mdev->int_dig_vv; |
| unsigned long *data; |
| |
| dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? |
| crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; |
| |
| if (dgs) { |
| rr = drbd_recv(mdev, dig_in, dgs); |
| if (rr != dgs) { |
| dev_warn(DEV, "short read receiving data digest: read %d expected %d\n", |
| rr, dgs); |
| return NULL; |
| } |
| } |
| |
| data_size -= dgs; |
| |
| ERR_IF(data_size & 0x1ff) return NULL; |
| ERR_IF(data_size > DRBD_MAX_SEGMENT_SIZE) return NULL; |
| |
| /* even though we trust out peer, |
| * we sometimes have to double check. */ |
| if (sector + (data_size>>9) > capacity) { |
| dev_err(DEV, "capacity: %llus < sector: %llus + size: %u\n", |
| (unsigned long long)capacity, |
| (unsigned long long)sector, data_size); |
| return NULL; |
| } |
| |
| /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
| * "criss-cross" setup, that might cause write-out on some other DRBD, |
| * which in turn might block on the other node at this very place. */ |
| e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); |
| if (!e) |
| return NULL; |
| |
| ds = data_size; |
| page = e->pages; |
| page_chain_for_each(page) { |
| unsigned len = min_t(int, ds, PAGE_SIZE); |
| data = kmap(page); |
| rr = drbd_recv(mdev, data, len); |
| if (FAULT_ACTIVE(mdev, DRBD_FAULT_RECEIVE)) { |
| dev_err(DEV, "Fault injection: Corrupting data on receive\n"); |
| data[0] = data[0] ^ (unsigned long)-1; |
| } |
| kunmap(page); |
| if (rr != len) { |
| drbd_free_ee(mdev, e); |
| dev_warn(DEV, "short read receiving data: read %d expected %d\n", |
| rr, len); |
| return NULL; |
| } |
| ds -= rr; |
| } |
| |
| if (dgs) { |
| drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv); |
| if (memcmp(dig_in, dig_vv, dgs)) { |
| dev_err(DEV, "Digest integrity check FAILED.\n"); |
| drbd_bcast_ee(mdev, "digest failed", |
| dgs, dig_in, dig_vv, e); |
| drbd_free_ee(mdev, e); |
| return NULL; |
| } |
| } |
| mdev->recv_cnt += data_size>>9; |
| return e; |
| } |
| |
| /* drbd_drain_block() just takes a data block |
| * out of the socket input buffer, and discards it. |
| */ |
| static int drbd_drain_block(struct drbd_conf *mdev, int data_size) |
| { |
| struct page *page; |
| int rr, rv = 1; |
| void *data; |
| |
| if (!data_size) |
| return TRUE; |
| |
| page = drbd_pp_alloc(mdev, 1, 1); |
| |
| data = kmap(page); |
| while (data_size) { |
| rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); |
| if (rr != min_t(int, data_size, PAGE_SIZE)) { |
| rv = 0; |
| dev_warn(DEV, "short read receiving data: read %d expected %d\n", |
| rr, min_t(int, data_size, PAGE_SIZE)); |
| break; |
| } |
| data_size -= rr; |
| } |
| kunmap(page); |
| drbd_pp_free(mdev, page); |
| return rv; |
| } |
| |
| static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, |
| sector_t sector, int data_size) |
| { |
| struct bio_vec *bvec; |
| struct bio *bio; |
| int dgs, rr, i, expect; |
| void *dig_in = mdev->int_dig_in; |
| void *dig_vv = mdev->int_dig_vv; |
| |
| dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? |
| crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; |
| |
| if (dgs) { |
| rr = drbd_recv(mdev, dig_in, dgs); |
| if (rr != dgs) { |
| dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n", |
| rr, dgs); |
| return 0; |
| } |
| } |
| |
| data_size -= dgs; |
| |
| /* optimistically update recv_cnt. if receiving fails below, |
| * we disconnect anyways, and counters will be reset. */ |
| mdev->recv_cnt += data_size>>9; |
| |
| bio = req->master_bio; |
| D_ASSERT(sector == bio->bi_sector); |
| |
| bio_for_each_segment(bvec, bio, i) { |
| expect = min_t(int, data_size, bvec->bv_len); |
| rr = drbd_recv(mdev, |
| kmap(bvec->bv_page)+bvec->bv_offset, |
| expect); |
| kunmap(bvec->bv_page); |
| if (rr != expect) { |
| dev_warn(DEV, "short read receiving data reply: " |
| "read %d expected %d\n", |
| rr, expect); |
| return 0; |
| } |
| data_size -= rr; |
| } |
| |
| if (dgs) { |
| drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv); |
| if (memcmp(dig_in, dig_vv, dgs)) { |
| dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); |
| return 0; |
| } |
| } |
| |
| D_ASSERT(data_size == 0); |
| return 1; |
| } |
| |
| /* e_end_resync_block() is called via |
| * drbd_process_done_ee() by asender only */ |
| static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) |
| { |
| struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; |
| sector_t sector = e->sector; |
| int ok; |
| |
| D_ASSERT(hlist_unhashed(&e->colision)); |
| |
| if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
| drbd_set_in_sync(mdev, sector, e->size); |
| ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e); |
| } else { |
| /* Record failure to sync */ |
| drbd_rs_failed_io(mdev, sector, e->size); |
| |
| ok = drbd_send_ack(mdev, P_NEG_ACK, e); |
| } |
| dec_unacked(mdev); |
| |
| return ok; |
| } |
| |
| static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) |
| { |
| struct drbd_epoch_entry *e; |
| |
| e = read_in_block(mdev, ID_SYNCER, sector, data_size); |
| if (!e) |
| goto fail; |
| |
| dec_rs_pending(mdev); |
| |
| inc_unacked(mdev); |
| /* corresponding dec_unacked() in e_end_resync_block() |
| * respective _drbd_clear_done_ee */ |
| |
| e->w.cb = e_end_resync_block; |
| |
| spin_lock_irq(&mdev->req_lock); |
| list_add(&e->w.list, &mdev->sync_ee); |
| spin_unlock_irq(&mdev->req_lock); |
| |
| if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0) |
| return TRUE; |
| |
| drbd_free_ee(mdev, e); |
| fail: |
| put_ldev(mdev); |
| return FALSE; |
| } |
| |
| static int receive_DataReply(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct drbd_request *req; |
| sector_t sector; |
| unsigned int header_size, data_size; |
| int ok; |
| struct p_data *p = (struct p_data *)h; |
| |
| header_size = sizeof(*p) - sizeof(*h); |
| data_size = h->length - header_size; |
| |
| ERR_IF(data_size == 0) return FALSE; |
| |
| if (drbd_recv(mdev, h->payload, header_size) != header_size) |
| return FALSE; |
| |
| sector = be64_to_cpu(p->sector); |
| |
| spin_lock_irq(&mdev->req_lock); |
| req = _ar_id_to_req(mdev, p->block_id, sector); |
| spin_unlock_irq(&mdev->req_lock); |
| if (unlikely(!req)) { |
| dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n"); |
| return FALSE; |
| } |
| |
| /* hlist_del(&req->colision) is done in _req_may_be_done, to avoid |
| * special casing it there for the various failure cases. |
| * still no race with drbd_fail_pending_reads */ |
| ok = recv_dless_read(mdev, req, sector, data_size); |
| |
| if (ok) |
| req_mod(req, data_received); |
| /* else: nothing. handled from drbd_disconnect... |
| * I don't think we may complete this just yet |
| * in case we are "on-disconnect: freeze" */ |
| |
| return ok; |
| } |
| |
| static int receive_RSDataReply(struct drbd_conf *mdev, struct p_header *h) |
| { |
| sector_t sector; |
| unsigned int header_size, data_size; |
| int ok; |
| struct p_data *p = (struct p_data *)h; |
| |
| header_size = sizeof(*p) - sizeof(*h); |
| data_size = h->length - header_size; |
| |
| ERR_IF(data_size == 0) return FALSE; |
| |
| if (drbd_recv(mdev, h->payload, header_size) != header_size) |
| return FALSE; |
| |
| sector = be64_to_cpu(p->sector); |
| D_ASSERT(p->block_id == ID_SYNCER); |
| |
| if (get_ldev(mdev)) { |
| /* data is submitted to disk within recv_resync_read. |
| * corresponding put_ldev done below on error, |
| * or in drbd_endio_write_sec. */ |
| ok = recv_resync_read(mdev, sector, data_size); |
| } else { |
| if (__ratelimit(&drbd_ratelimit_state)) |
| dev_err(DEV, "Can not write resync data to local disk.\n"); |
| |
| ok = drbd_drain_block(mdev, data_size); |
| |
| drbd_send_ack_dp(mdev, P_NEG_ACK, p); |
| } |
| |
| return ok; |
| } |
| |
| /* e_end_block() is called via drbd_process_done_ee(). |
| * this means this function only runs in the asender thread |
| */ |
| static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| { |
| struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; |
| sector_t sector = e->sector; |
| struct drbd_epoch *epoch; |
| int ok = 1, pcmd; |
| |
| if (e->flags & EE_IS_BARRIER) { |
| epoch = previous_epoch(mdev, e->epoch); |
| if (epoch) |
| drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE + (cancel ? EV_CLEANUP : 0)); |
| } |
| |
| if (mdev->net_conf->wire_protocol == DRBD_PROT_C) { |
| if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
| pcmd = (mdev->state.conn >= C_SYNC_SOURCE && |
| mdev->state.conn <= C_PAUSED_SYNC_T && |
| e->flags & EE_MAY_SET_IN_SYNC) ? |
| P_RS_WRITE_ACK : P_WRITE_ACK; |
| ok &= drbd_send_ack(mdev, pcmd, e); |
| if (pcmd == P_RS_WRITE_ACK) |
| drbd_set_in_sync(mdev, sector, e->size); |
| } else { |
| ok = drbd_send_ack(mdev, P_NEG_ACK, e); |
| /* we expect it to be marked out of sync anyways... |
| * maybe assert this? */ |
| } |
| dec_unacked(mdev); |
| } |
| /* we delete from the conflict detection hash _after_ we sent out the |
| * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ |
| if (mdev->net_conf->two_primaries) { |
| spin_lock_irq(&mdev->req_lock); |
| D_ASSERT(!hlist_unhashed(&e->colision)); |
| hlist_del_init(&e->colision); |
| spin_unlock_irq(&mdev->req_lock); |
| } else { |
| D_ASSERT(hlist_unhashed(&e->colision)); |
| } |
| |
| drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); |
| |
| return ok; |
| } |
| |
| static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) |
| { |
| struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; |
| int ok = 1; |
| |
| D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); |
| ok = drbd_send_ack(mdev, P_DISCARD_ACK, e); |
| |
| spin_lock_irq(&mdev->req_lock); |
| D_ASSERT(!hlist_unhashed(&e->colision)); |
| hlist_del_init(&e->colision); |
| spin_unlock_irq(&mdev->req_lock); |
| |
| dec_unacked(mdev); |
| |
| return ok; |
| } |
| |
| /* Called from receive_Data. |
| * Synchronize packets on sock with packets on msock. |
| * |
| * This is here so even when a P_DATA packet traveling via sock overtook an Ack |
| * packet traveling on msock, they are still processed in the order they have |
| * been sent. |
| * |
| * Note: we don't care for Ack packets overtaking P_DATA packets. |
| * |
| * In case packet_seq is larger than mdev->peer_seq number, there are |
| * outstanding packets on the msock. We wait for them to arrive. |
| * In case we are the logically next packet, we update mdev->peer_seq |
| * ourselves. Correctly handles 32bit wrap around. |
| * |
| * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, |
| * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds |
| * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have |
| * 1<<9 == 512 seconds aka ages for the 32bit wrap around... |
| * |
| * returns 0 if we may process the packet, |
| * -ERESTARTSYS if we were interrupted (by disconnect signal). */ |
| static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) |
| { |
| DEFINE_WAIT(wait); |
| unsigned int p_seq; |
| long timeout; |
| int ret = 0; |
| spin_lock(&mdev->peer_seq_lock); |
| for (;;) { |
| prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); |
| if (seq_le(packet_seq, mdev->peer_seq+1)) |
| break; |
| if (signal_pending(current)) { |
| ret = -ERESTARTSYS; |
| break; |
| } |
| p_seq = mdev->peer_seq; |
| spin_unlock(&mdev->peer_seq_lock); |
| timeout = schedule_timeout(30*HZ); |
| spin_lock(&mdev->peer_seq_lock); |
| if (timeout == 0 && p_seq == mdev->peer_seq) { |
| ret = -ETIMEDOUT; |
| dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); |
| break; |
| } |
| } |
| finish_wait(&mdev->seq_wait, &wait); |
| if (mdev->peer_seq+1 == packet_seq) |
| mdev->peer_seq++; |
| spin_unlock(&mdev->peer_seq_lock); |
| return ret; |
| } |
| |
| /* mirrored write */ |
| static int receive_Data(struct drbd_conf *mdev, struct p_header *h) |
| { |
| sector_t sector; |
| struct drbd_epoch_entry *e; |
| struct p_data *p = (struct p_data *)h; |
| int header_size, data_size; |
| int rw = WRITE; |
| u32 dp_flags; |
| |
| header_size = sizeof(*p) - sizeof(*h); |
| data_size = h->length - header_size; |
| |
| ERR_IF(data_size == 0) return FALSE; |
| |
| if (drbd_recv(mdev, h->payload, header_size) != header_size) |
| return FALSE; |
| |
| if (!get_ldev(mdev)) { |
| if (__ratelimit(&drbd_ratelimit_state)) |
| dev_err(DEV, "Can not write mirrored data block " |
| "to local disk.\n"); |
| spin_lock(&mdev->peer_seq_lock); |
| if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) |
| mdev->peer_seq++; |
| spin_unlock(&mdev->peer_seq_lock); |
| |
| drbd_send_ack_dp(mdev, P_NEG_ACK, p); |
| atomic_inc(&mdev->current_epoch->epoch_size); |
| return drbd_drain_block(mdev, data_size); |
| } |
| |
| /* get_ldev(mdev) successful. |
| * Corresponding put_ldev done either below (on various errors), |
| * or in drbd_endio_write_sec, if we successfully submit the data at |
| * the end of this function. */ |
| |
| sector = be64_to_cpu(p->sector); |
| e = read_in_block(mdev, p->block_id, sector, data_size); |
| if (!e) { |
| put_ldev(mdev); |
| return FALSE; |
| } |
| |
| e->w.cb = e_end_block; |
| |
| spin_lock(&mdev->epoch_lock); |
| e->epoch = mdev->current_epoch; |
| atomic_inc(&e->epoch->epoch_size); |
| atomic_inc(&e->epoch->active); |
| |
| if (mdev->write_ordering == WO_bio_barrier && atomic_read(&e->epoch->epoch_size) == 1) { |
| struct drbd_epoch *epoch; |
| /* Issue a barrier if we start a new epoch, and the previous epoch |
| was not a epoch containing a single request which already was |
| a Barrier. */ |
| epoch = list_entry(e->epoch->list.prev, struct drbd_epoch, list); |
| if (epoch == e->epoch) { |
| set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags); |
| rw |= REQ_HARDBARRIER; |
| e->flags |= EE_IS_BARRIER; |
| } else { |
| if (atomic_read(&epoch->epoch_size) > 1 || |
| !test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) { |
| set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags); |
| set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags); |
| rw |= REQ_HARDBARRIER; |
| e->flags |= EE_IS_BARRIER; |
| } |
| } |
| } |
| spin_unlock(&mdev->epoch_lock); |
| |
| dp_flags = be32_to_cpu(p->dp_flags); |
| if (dp_flags & DP_HARDBARRIER) { |
| dev_err(DEV, "ASSERT FAILED would have submitted barrier request\n"); |
| /* rw |= REQ_HARDBARRIER; */ |
| } |
| if (dp_flags & DP_RW_SYNC) |
| rw |= REQ_SYNC | REQ_UNPLUG; |
| if (dp_flags & DP_MAY_SET_IN_SYNC) |
| e->flags |= EE_MAY_SET_IN_SYNC; |
| |
| /* I'm the receiver, I do hold a net_cnt reference. */ |
| if (!mdev->net_conf->two_primaries) { |
| spin_lock_irq(&mdev->req_lock); |
| } else { |
| /* don't get the req_lock yet, |
| * we may sleep in drbd_wait_peer_seq */ |
| const int size = e->size; |
| const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags); |
| DEFINE_WAIT(wait); |
| struct drbd_request *i; |
| struct hlist_node *n; |
| struct hlist_head *slot; |
| int first; |
| |
| D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); |
| BUG_ON(mdev->ee_hash == NULL); |
| BUG_ON(mdev->tl_hash == NULL); |
| |
| /* conflict detection and handling: |
| * 1. wait on the sequence number, |
| * in case this data packet overtook ACK packets. |
| * 2. check our hash tables for conflicting requests. |
| * we only need to walk the tl_hash, since an ee can not |
| * have a conflict with an other ee: on the submitting |
| * node, the corresponding req had already been conflicting, |
| * and a conflicting req is never sent. |
| * |
| * Note: for two_primaries, we are protocol C, |
| * so there cannot be any request that is DONE |
| * but still on the transfer log. |
| * |
| * unconditionally add to the ee_hash. |
| * |
| * if no conflicting request is found: |
| * submit. |
| * |
| * if any conflicting request is found |
| * that has not yet been acked, |
| * AND I have the "discard concurrent writes" flag: |
| * queue (via done_ee) the P_DISCARD_ACK; OUT. |
| * |
| * if any conflicting request is found: |
| * block the receiver, waiting on misc_wait |
| * until no more conflicting requests are there, |
| * or we get interrupted (disconnect). |
| * |
| * we do not just write after local io completion of those |
| * requests, but only after req is done completely, i.e. |
| * we wait for the P_DISCARD_ACK to arrive! |
| * |
| * then proceed normally, i.e. submit. |
| */ |
| if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) |
| goto out_interrupted; |
| |
| spin_lock_irq(&mdev->req_lock); |
| |
| hlist_add_head(&e->colision, ee_hash_slot(mdev, sector)); |
| |
| #define OVERLAPS overlaps(i->sector, i->size, sector, size) |
| slot = tl_hash_slot(mdev, sector); |
| first = 1; |
| for (;;) { |
| int have_unacked = 0; |
| int have_conflict = 0; |
| prepare_to_wait(&mdev->misc_wait, &wait, |
| TASK_INTERRUPTIBLE); |
| hlist_for_each_entry(i, n, slot, colision) { |
| if (OVERLAPS) { |
| /* only ALERT on first iteration, |
| * we may be woken up early... */ |
| if (first) |
| dev_alert(DEV, "%s[%u] Concurrent local write detected!" |
| " new: %llus +%u; pending: %llus +%u\n", |
| current->comm, current->pid, |
| (unsigned long long)sector, size, |
| (unsigned long long)i->sector, i->size); |
| if (i->rq_state & RQ_NET_PENDING) |
| ++have_unacked; |
| ++have_conflict; |
| } |
| } |
| #undef OVERLAPS |
| if (!have_conflict) |
| break; |
| |
| /* Discard Ack only for the _first_ iteration */ |
| if (first && discard && have_unacked) { |
| dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", |
| (unsigned long long)sector); |
| inc_unacked(mdev); |
| e->w.cb = e_send_discard_ack; |
| list_add_tail(&e->w.list, &mdev->done_ee); |
| |
| spin_unlock_irq(&mdev->req_lock); |
| |
| /* we could probably send that P_DISCARD_ACK ourselves, |
| * but I don't like the receiver using the msock */ |
| |
| put_ldev(mdev); |
| wake_asender(mdev); |
| finish_wait(&mdev->misc_wait, &wait); |
| return TRUE; |
| } |
| |
| if (signal_pending(current)) { |
| hlist_del_init(&e->colision); |
| |
| spin_unlock_irq(&mdev->req_lock); |
| |
| finish_wait(&mdev->misc_wait, &wait); |
| goto out_interrupted; |
| } |
| |
| spin_unlock_irq(&mdev->req_lock); |
| if (first) { |
| first = 0; |
| dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " |
| "sec=%llus\n", (unsigned long long)sector); |
| } else if (discard) { |
| /* we had none on the first iteration. |
| * there must be none now. */ |
| D_ASSERT(have_unacked == 0); |
| } |
| schedule(); |
| spin_lock_irq(&mdev->req_lock); |
| } |
| finish_wait(&mdev->misc_wait, &wait); |
| } |
| |
| list_add(&e->w.list, &mdev->active_ee); |
| spin_unlock_irq(&mdev->req_lock); |
| |
| switch (mdev->net_conf->wire_protocol) { |
| case DRBD_PROT_C: |
| inc_unacked(mdev); |
| /* corresponding dec_unacked() in e_end_block() |
| * respective _drbd_clear_done_ee */ |
| break; |
| case DRBD_PROT_B: |
| /* I really don't like it that the receiver thread |
| * sends on the msock, but anyways */ |
| drbd_send_ack(mdev, P_RECV_ACK, e); |
| break; |
| case DRBD_PROT_A: |
| /* nothing to do */ |
| break; |
| } |
| |
| if (mdev->state.pdsk == D_DISKLESS) { |
| /* In case we have the only disk of the cluster, */ |
| drbd_set_out_of_sync(mdev, e->sector, e->size); |
| e->flags |= EE_CALL_AL_COMPLETE_IO; |
| drbd_al_begin_io(mdev, e->sector); |
| } |
| |
| if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0) |
| return TRUE; |
| |
| out_interrupted: |
| /* yes, the epoch_size now is imbalanced. |
| * but we drop the connection anyways, so we don't have a chance to |
| * receive a barrier... atomic_inc(&mdev->epoch_size); */ |
| put_ldev(mdev); |
| drbd_free_ee(mdev, e); |
| return FALSE; |
| } |
| |
| static int receive_DataRequest(struct drbd_conf *mdev, struct p_header *h) |
| { |
| sector_t sector; |
| const sector_t capacity = drbd_get_capacity(mdev->this_bdev); |
| struct drbd_epoch_entry *e; |
| struct digest_info *di = NULL; |
| int size, digest_size; |
| unsigned int fault_type; |
| struct p_block_req *p = |
| (struct p_block_req *)h; |
| const int brps = sizeof(*p)-sizeof(*h); |
| |
| if (drbd_recv(mdev, h->payload, brps) != brps) |
| return FALSE; |
| |
| sector = be64_to_cpu(p->sector); |
| size = be32_to_cpu(p->blksize); |
| |
| if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) { |
| dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
| (unsigned long long)sector, size); |
| return FALSE; |
| } |
| if (sector + (size>>9) > capacity) { |
| dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
| (unsigned long long)sector, size); |
| return FALSE; |
| } |
| |
| if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { |
| if (__ratelimit(&drbd_ratelimit_state)) |
| dev_err(DEV, "Can not satisfy peer's read request, " |
| "no local data.\n"); |
| drbd_send_ack_rp(mdev, h->command == P_DATA_REQUEST ? P_NEG_DREPLY : |
| P_NEG_RS_DREPLY , p); |
| return drbd_drain_block(mdev, h->length - brps); |
| } |
| |
| /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
| * "criss-cross" setup, that might cause write-out on some other DRBD, |
| * which in turn might block on the other node at this very place. */ |
| e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); |
| if (!e) { |
| put_ldev(mdev); |
| return FALSE; |
| } |
| |
| switch (h->command) { |
| case P_DATA_REQUEST: |
| e->w.cb = w_e_end_data_req; |
| fault_type = DRBD_FAULT_DT_RD; |
| break; |
| case P_RS_DATA_REQUEST: |
| e->w.cb = w_e_end_rsdata_req; |
| fault_type = DRBD_FAULT_RS_RD; |
| /* Eventually this should become asynchronously. Currently it |
| * blocks the whole receiver just to delay the reading of a |
| * resync data block. |
| * the drbd_work_queue mechanism is made for this... |
| */ |
| if (!drbd_rs_begin_io(mdev, sector)) { |
| /* we have been interrupted, |
| * probably connection lost! */ |
| D_ASSERT(signal_pending(current)); |
| goto out_free_e; |
| } |
| break; |
| |
| case P_OV_REPLY: |
| case P_CSUM_RS_REQUEST: |
| fault_type = DRBD_FAULT_RS_RD; |
| digest_size = h->length - brps ; |
| di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); |
| if (!di) |
| goto out_free_e; |
| |
| di->digest_size = digest_size; |
| di->digest = (((char *)di)+sizeof(struct digest_info)); |
| |
| if (drbd_recv(mdev, di->digest, digest_size) != digest_size) |
| goto out_free_e; |
| |
| e->block_id = (u64)(unsigned long)di; |
| if (h->command == P_CSUM_RS_REQUEST) { |
| D_ASSERT(mdev->agreed_pro_version >= 89); |
| e->w.cb = w_e_end_csum_rs_req; |
| } else if (h->command == P_OV_REPLY) { |
| e->w.cb = w_e_end_ov_reply; |
| dec_rs_pending(mdev); |
| break; |
| } |
| |
| if (!drbd_rs_begin_io(mdev, sector)) { |
| /* we have been interrupted, probably connection lost! */ |
| D_ASSERT(signal_pending(current)); |
| goto out_free_e; |
| } |
| break; |
| |
| case P_OV_REQUEST: |
| if (mdev->state.conn >= C_CONNECTED && |
| mdev->state.conn != C_VERIFY_T) |
| dev_warn(DEV, "ASSERT FAILED: got P_OV_REQUEST while being %s\n", |
| drbd_conn_str(mdev->state.conn)); |
| if (mdev->ov_start_sector == ~(sector_t)0 && |
| mdev->agreed_pro_version >= 90) { |
| mdev->ov_start_sector = sector; |
| mdev->ov_position = sector; |
| mdev->ov_left = mdev->rs_total - BM_SECT_TO_BIT(sector); |
| dev_info(DEV, "Online Verify start sector: %llu\n", |
| (unsigned long long)sector); |
| } |
| e->w.cb = w_e_end_ov_req; |
| fault_type = DRBD_FAULT_RS_RD; |
| /* Eventually this should become asynchronous. Currently it |
| * blocks the whole receiver just to delay the reading of a |
| * resync data block. |
| * the drbd_work_queue mechanism is made for this... |
| */ |
| if (!drbd_rs_begin_io(mdev, sector)) { |
| /* we have been interrupted, |
| * probably connection lost! */ |
| D_ASSERT(signal_pending(current)); |
| goto out_free_e; |
| } |
| break; |
| |
| |
| default: |
| dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", |
| cmdname(h->command)); |
| fault_type = DRBD_FAULT_MAX; |
| } |
| |
| spin_lock_irq(&mdev->req_lock); |
| list_add(&e->w.list, &mdev->read_ee); |
| spin_unlock_irq(&mdev->req_lock); |
| |
| inc_unacked(mdev); |
| |
| if (drbd_submit_ee(mdev, e, READ, fault_type) == 0) |
| return TRUE; |
| |
| out_free_e: |
| kfree(di); |
| put_ldev(mdev); |
| drbd_free_ee(mdev, e); |
| return FALSE; |
| } |
| |
| static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) |
| { |
| int self, peer, rv = -100; |
| unsigned long ch_self, ch_peer; |
| |
| self = mdev->ldev->md.uuid[UI_BITMAP] & 1; |
| peer = mdev->p_uuid[UI_BITMAP] & 1; |
| |
| ch_peer = mdev->p_uuid[UI_SIZE]; |
| ch_self = mdev->comm_bm_set; |
| |
| switch (mdev->net_conf->after_sb_0p) { |
| case ASB_CONSENSUS: |
| case ASB_DISCARD_SECONDARY: |
| case ASB_CALL_HELPER: |
| dev_err(DEV, "Configuration error.\n"); |
| break; |
| case ASB_DISCONNECT: |
| break; |
| case ASB_DISCARD_YOUNGER_PRI: |
| if (self == 0 && peer == 1) { |
| rv = -1; |
| break; |
| } |
| if (self == 1 && peer == 0) { |
| rv = 1; |
| break; |
| } |
| /* Else fall through to one of the other strategies... */ |
| case ASB_DISCARD_OLDER_PRI: |
| if (self == 0 && peer == 1) { |
| rv = 1; |
| break; |
| } |
| if (self == 1 && peer == 0) { |
| rv = -1; |
| break; |
| } |
| /* Else fall through to one of the other strategies... */ |
| dev_warn(DEV, "Discard younger/older primary did not find a decision\n" |
| "Using discard-least-changes instead\n"); |
| case ASB_DISCARD_ZERO_CHG: |
| if (ch_peer == 0 && ch_self == 0) { |
| rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) |
| ? -1 : 1; |
| break; |
| } else { |
| if (ch_peer == 0) { rv = 1; break; } |
| if (ch_self == 0) { rv = -1; break; } |
| } |
| if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) |
| break; |
| case ASB_DISCARD_LEAST_CHG: |
| if (ch_self < ch_peer) |
| rv = -1; |
| else if (ch_self > ch_peer) |
| rv = 1; |
| else /* ( ch_self == ch_peer ) */ |
| /* Well, then use something else. */ |
| rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) |
| ? -1 : 1; |
| break; |
| case ASB_DISCARD_LOCAL: |
| rv = -1; |
| break; |
| case ASB_DISCARD_REMOTE: |
| rv = 1; |
| } |
| |
| return rv; |
| } |
| |
| static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) |
| { |
| int self, peer, hg, rv = -100; |
| |
| self = mdev->ldev->md.uuid[UI_BITMAP] & 1; |
| peer = mdev->p_uuid[UI_BITMAP] & 1; |
| |
| switch (mdev->net_conf->after_sb_1p) { |
| case ASB_DISCARD_YOUNGER_PRI: |
| case ASB_DISCARD_OLDER_PRI: |
| case ASB_DISCARD_LEAST_CHG: |
| case ASB_DISCARD_LOCAL: |
| case ASB_DISCARD_REMOTE: |
| dev_err(DEV, "Configuration error.\n"); |
| break; |
| case ASB_DISCONNECT: |
| break; |
| case ASB_CONSENSUS: |
| hg = drbd_asb_recover_0p(mdev); |
| if (hg == -1 && mdev->state.role == R_SECONDARY) |
| rv = hg; |
| if (hg == 1 && mdev->state.role == R_PRIMARY) |
| rv = hg; |
| break; |
| case ASB_VIOLENTLY: |
| rv = drbd_asb_recover_0p(mdev); |
| break; |
| case ASB_DISCARD_SECONDARY: |
| return mdev->state.role == R_PRIMARY ? 1 : -1; |
| case ASB_CALL_HELPER: |
| hg = drbd_asb_recover_0p(mdev); |
| if (hg == -1 && mdev->state.role == R_PRIMARY) { |
| self = drbd_set_role(mdev, R_SECONDARY, 0); |
| /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
| * we might be here in C_WF_REPORT_PARAMS which is transient. |
| * we do not need to wait for the after state change work either. */ |
| self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); |
| if (self != SS_SUCCESS) { |
| drbd_khelper(mdev, "pri-lost-after-sb"); |
| } else { |
| dev_warn(DEV, "Successfully gave up primary role.\n"); |
| rv = hg; |
| } |
| } else |
| rv = hg; |
| } |
| |
| return rv; |
| } |
| |
| static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) |
| { |
| int self, peer, hg, rv = -100; |
| |
| self = mdev->ldev->md.uuid[UI_BITMAP] & 1; |
| peer = mdev->p_uuid[UI_BITMAP] & 1; |
| |
| switch (mdev->net_conf->after_sb_2p) { |
| case ASB_DISCARD_YOUNGER_PRI: |
| case ASB_DISCARD_OLDER_PRI: |
| case ASB_DISCARD_LEAST_CHG: |
| case ASB_DISCARD_LOCAL: |
| case ASB_DISCARD_REMOTE: |
| case ASB_CONSENSUS: |
| case ASB_DISCARD_SECONDARY: |
| dev_err(DEV, "Configuration error.\n"); |
| break; |
| case ASB_VIOLENTLY: |
| rv = drbd_asb_recover_0p(mdev); |
| break; |
| case ASB_DISCONNECT: |
| break; |
| case ASB_CALL_HELPER: |
| hg = drbd_asb_recover_0p(mdev); |
| if (hg == -1) { |
| /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
| * we might be here in C_WF_REPORT_PARAMS which is transient. |
| * we do not need to wait for the after state change work either. */ |
| self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); |
| if (self != SS_SUCCESS) { |
| drbd_khelper(mdev, "pri-lost-after-sb"); |
| } else { |
| dev_warn(DEV, "Successfully gave up primary role.\n"); |
| rv = hg; |
| } |
| } else |
| rv = hg; |
| } |
| |
| return rv; |
| } |
| |
| static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, |
| u64 bits, u64 flags) |
| { |
| if (!uuid) { |
| dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); |
| return; |
| } |
| dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", |
| text, |
| (unsigned long long)uuid[UI_CURRENT], |
| (unsigned long long)uuid[UI_BITMAP], |
| (unsigned long long)uuid[UI_HISTORY_START], |
| (unsigned long long)uuid[UI_HISTORY_END], |
| (unsigned long long)bits, |
| (unsigned long long)flags); |
| } |
| |
| /* |
| 100 after split brain try auto recover |
| 2 C_SYNC_SOURCE set BitMap |
| 1 C_SYNC_SOURCE use BitMap |
| 0 no Sync |
| -1 C_SYNC_TARGET use BitMap |
| -2 C_SYNC_TARGET set BitMap |
| -100 after split brain, disconnect |
| -1000 unrelated data |
| */ |
| static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) |
| { |
| u64 self, peer; |
| int i, j; |
| |
| self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
| peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); |
| |
| *rule_nr = 10; |
| if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) |
| return 0; |
| |
| *rule_nr = 20; |
| if ((self == UUID_JUST_CREATED || self == (u64)0) && |
| peer != UUID_JUST_CREATED) |
| return -2; |
| |
| *rule_nr = 30; |
| if (self != UUID_JUST_CREATED && |
| (peer == UUID_JUST_CREATED || peer == (u64)0)) |
| return 2; |
| |
| if (self == peer) { |
| int rct, dc; /* roles at crash time */ |
| |
| if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { |
| |
| if (mdev->agreed_pro_version < 91) |
| return -1001; |
| |
| if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && |
| (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { |
| dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); |
| drbd_uuid_set_bm(mdev, 0UL); |
| |
| drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, |
| mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); |
| *rule_nr = 34; |
| } else { |
| dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); |
| *rule_nr = 36; |
| } |
| |
| return 1; |
| } |
| |
| if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { |
| |
| if (mdev->agreed_pro_version < 91) |
| return -1001; |
| |
| if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && |
| (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { |
| dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); |
| |
| mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; |
| mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; |
| mdev->p_uuid[UI_BITMAP] = 0UL; |
| |
| drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); |
| *rule_nr = 35; |
| } else { |
| dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); |
| *rule_nr = 37; |
| } |
| |
| return -1; |
| } |
| |
| /* Common power [off|failure] */ |
| rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + |
| (mdev->p_uuid[UI_FLAGS] & 2); |
| /* lowest bit is set when we were primary, |
| * next bit (weight 2) is set when peer was primary */ |
| *rule_nr = 40; |
| |
| switch (rct) { |
| case 0: /* !self_pri && !peer_pri */ return 0; |
| case 1: /* self_pri && !peer_pri */ return 1; |
| case 2: /* !self_pri && peer_pri */ return -1; |
| case 3: /* self_pri && peer_pri */ |
| dc = test_bit(DISCARD_CONCURRENT, &mdev->flags); |
| return dc ? -1 : 1; |
| } |
| } |
| |
| *rule_nr = 50; |
| peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); |
| if (self == peer) |
| return -1; |
| |
| *rule_nr = 51; |
| peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); |
| if (self == peer) { |
| self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); |
| peer = mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1); |
| if (self == peer) { |
| /* The last P_SYNC_UUID did not get though. Undo the last start of |
| resync as sync source modifications of the peer's UUIDs. */ |
| |
| if (mdev->agreed_pro_version < 91) |
| return -1001; |
| |
| mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; |
| mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; |
| return -1; |
| } |
| } |
| |
| *rule_nr = 60; |
| self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
| for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
| peer = mdev->p_uuid[i] & ~((u64)1); |
| if (self == peer) |
| return -2; |
| } |
| |
| *rule_nr = 70; |
| self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
| peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); |
| if (self == peer) |
| return 1; |
| |
| *rule_nr = 71; |
| self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); |
| if (self == peer) { |
| self = mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1); |
| peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); |
| if (self == peer) { |
| /* The last P_SYNC_UUID did not get though. Undo the last start of |
| resync as sync source modifications of our UUIDs. */ |
| |
| if (mdev->agreed_pro_version < 91) |
| return -1001; |
| |
| _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); |
| _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); |
| |
| dev_info(DEV, "Undid last start of resync:\n"); |
| |
| drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, |
| mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); |
| |
| return 1; |
| } |
| } |
| |
| |
| *rule_nr = 80; |
| peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); |
| for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
| self = mdev->ldev->md.uuid[i] & ~((u64)1); |
| if (self == peer) |
| return 2; |
| } |
| |
| *rule_nr = 90; |
| self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
| peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); |
| if (self == peer && self != ((u64)0)) |
| return 100; |
| |
| *rule_nr = 100; |
| for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
| self = mdev->ldev->md.uuid[i] & ~((u64)1); |
| for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { |
| peer = mdev->p_uuid[j] & ~((u64)1); |
| if (self == peer) |
| return -100; |
| } |
| } |
| |
| return -1000; |
| } |
| |
| /* drbd_sync_handshake() returns the new conn state on success, or |
| CONN_MASK (-1) on failure. |
| */ |
| static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, |
| enum drbd_disk_state peer_disk) __must_hold(local) |
| { |
| int hg, rule_nr; |
| enum drbd_conns rv = C_MASK; |
| enum drbd_disk_state mydisk; |
| |
| mydisk = mdev->state.disk; |
| if (mydisk == D_NEGOTIATING) |
| mydisk = mdev->new_state_tmp.disk; |
| |
| dev_info(DEV, "drbd_sync_handshake:\n"); |
| drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); |
| drbd_uuid_dump(mdev, "peer", mdev->p_uuid, |
| mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); |
| |
| hg = drbd_uuid_compare(mdev, &rule_nr); |
| |
| dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); |
| |
| if (hg == -1000) { |
| dev_alert(DEV, "Unrelated data, aborting!\n"); |
| return C_MASK; |
| } |
| if (hg == -1001) { |
| dev_alert(DEV, "To resolve this both sides have to support at least protocol\n"); |
| return C_MASK; |
| } |
| |
| if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || |
| (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { |
| int f = (hg == -100) || abs(hg) == 2; |
| hg = mydisk > D_INCONSISTENT ? 1 : -1; |
| if (f) |
| hg = hg*2; |
| dev_info(DEV, "Becoming sync %s due to disk states.\n", |
| hg > 0 ? "source" : "target"); |
| } |
| |
| if (abs(hg) == 100) |
| drbd_khelper(mdev, "initial-split-brain"); |
| |
| if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) { |
| int pcount = (mdev->state.role == R_PRIMARY) |
| + (peer_role == R_PRIMARY); |
| int forced = (hg == -100); |
| |
| switch (pcount) { |
| case 0: |
| hg = drbd_asb_recover_0p(mdev); |
| break; |
| case 1: |
| hg = drbd_asb_recover_1p(mdev); |
| break; |
| case 2: |
| hg = drbd_asb_recover_2p(mdev); |
| break; |
| } |
| if (abs(hg) < 100) { |
| dev_warn(DEV, "Split-Brain detected, %d primaries, " |
| "automatically solved. Sync from %s node\n", |
| pcount, (hg < 0) ? "peer" : "this"); |
| if (forced) { |
| dev_warn(DEV, "Doing a full sync, since" |
| " UUIDs where ambiguous.\n"); |
| hg = hg*2; |
| } |
| } |
| } |
| |
| if (hg == -100) { |
| if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) |
| hg = -1; |
| if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) |
| hg = 1; |
| |
| if (abs(hg) < 100) |
| dev_warn(DEV, "Split-Brain detected, manually solved. " |
| "Sync from %s node\n", |
| (hg < 0) ? "peer" : "this"); |
| } |
| |
| if (hg == -100) { |
| /* FIXME this log message is not correct if we end up here |
| * after an attempted attach on a diskless node. |
| * We just refuse to attach -- well, we drop the "connection" |
| * to that disk, in a way... */ |
| dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); |
| drbd_khelper(mdev, "split-brain"); |
| return C_MASK; |
| } |
| |
| if (hg > 0 && mydisk <= D_INCONSISTENT) { |
| dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); |
| return C_MASK; |
| } |
| |
| if (hg < 0 && /* by intention we do not use mydisk here. */ |
| mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { |
| switch (mdev->net_conf->rr_conflict) { |
| case ASB_CALL_HELPER: |
| drbd_khelper(mdev, "pri-lost"); |
| /* fall through */ |
| case ASB_DISCONNECT: |
| dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); |
| return C_MASK; |
| case ASB_VIOLENTLY: |
| dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" |
| "assumption\n"); |
| } |
| } |
| |
| if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { |
| if (hg == 0) |
| dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); |
| else |
| dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", |
| drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), |
| abs(hg) >= 2 ? "full" : "bit-map based"); |
| return C_MASK; |
| } |
| |
| if (abs(hg) >= 2) { |
| dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); |
| if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake")) |
| return C_MASK; |
| } |
| |
| if (hg > 0) { /* become sync source. */ |
| rv = C_WF_BITMAP_S; |
| } else if (hg < 0) { /* become sync target */ |
| rv = C_WF_BITMAP_T; |
| } else { |
| rv = C_CONNECTED; |
| if (drbd_bm_total_weight(mdev)) { |
| dev_info(DEV, "No resync, but %lu bits in bitmap!\n", |
| drbd_bm_total_weight(mdev)); |
| } |
| } |
| |
| return rv; |
| } |
| |
| /* returns 1 if invalid */ |
| static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) |
| { |
| /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ |
| if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || |
| (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) |
| return 0; |
| |
| /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ |
| if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || |
| self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) |
| return 1; |
| |
| /* everything else is valid if they are equal on both sides. */ |
| if (peer == self) |
| return 0; |
| |
| /* everything es is invalid. */ |
| return 1; |
| } |
| |
| static int receive_protocol(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_protocol *p = (struct p_protocol *)h; |
| int header_size, data_size; |
| int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
| int p_want_lose, p_two_primaries, cf; |
| char p_integrity_alg[SHARED_SECRET_MAX] = ""; |
| |
| header_size = sizeof(*p) - sizeof(*h); |
| data_size = h->length - header_size; |
| |
| if (drbd_recv(mdev, h->payload, header_size) != header_size) |
| return FALSE; |
| |
| p_proto = be32_to_cpu(p->protocol); |
| p_after_sb_0p = be32_to_cpu(p->after_sb_0p); |
| p_after_sb_1p = be32_to_cpu(p->after_sb_1p); |
| p_after_sb_2p = be32_to_cpu(p->after_sb_2p); |
| p_two_primaries = be32_to_cpu(p->two_primaries); |
| cf = be32_to_cpu(p->conn_flags); |
| p_want_lose = cf & CF_WANT_LOSE; |
| |
| clear_bit(CONN_DRY_RUN, &mdev->flags); |
| |
| if (cf & CF_DRY_RUN) |
| set_bit(CONN_DRY_RUN, &mdev->flags); |
| |
| if (p_proto != mdev->net_conf->wire_protocol) { |
| dev_err(DEV, "incompatible communication protocols\n"); |
| goto disconnect; |
| } |
| |
| if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) { |
| dev_err(DEV, "incompatible after-sb-0pri settings\n"); |
| goto disconnect; |
| } |
| |
| if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) { |
| dev_err(DEV, "incompatible after-sb-1pri settings\n"); |
| goto disconnect; |
| } |
| |
| if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) { |
| dev_err(DEV, "incompatible after-sb-2pri settings\n"); |
| goto disconnect; |
| } |
| |
| if (p_want_lose && mdev->net_conf->want_lose) { |
| dev_err(DEV, "both sides have the 'want_lose' flag set\n"); |
| goto disconnect; |
| } |
| |
| if (p_two_primaries != mdev->net_conf->two_primaries) { |
| dev_err(DEV, "incompatible setting of the two-primaries options\n"); |
| goto disconnect; |
| } |
| |
| if (mdev->agreed_pro_version >= 87) { |
| unsigned char *my_alg = mdev->net_conf->integrity_alg; |
| |
| if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) |
| return FALSE; |
| |
| p_integrity_alg[SHARED_SECRET_MAX-1] = 0; |
| if (strcmp(p_integrity_alg, my_alg)) { |
| dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); |
| goto disconnect; |
| } |
| dev_info(DEV, "data-integrity-alg: %s\n", |
| my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); |
| } |
| |
| return TRUE; |
| |
| disconnect: |
| drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| return FALSE; |
| } |
| |
| /* helper function |
| * input: alg name, feature name |
| * return: NULL (alg name was "") |
| * ERR_PTR(error) if something goes wrong |
| * or the crypto hash ptr, if it worked out ok. */ |
| struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, |
| const char *alg, const char *name) |
| { |
| struct crypto_hash *tfm; |
| |
| if (!alg[0]) |
| return NULL; |
| |
| tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); |
| if (IS_ERR(tfm)) { |
| dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", |
| alg, name, PTR_ERR(tfm)); |
| return tfm; |
| } |
| if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { |
| crypto_free_hash(tfm); |
| dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); |
| return ERR_PTR(-EINVAL); |
| } |
| return tfm; |
| } |
| |
| static int receive_SyncParam(struct drbd_conf *mdev, struct p_header *h) |
| { |
| int ok = TRUE; |
| struct p_rs_param_95 *p = (struct p_rs_param_95 *)h; |
| unsigned int header_size, data_size, exp_max_sz; |
| struct crypto_hash *verify_tfm = NULL; |
| struct crypto_hash *csums_tfm = NULL; |
| const int apv = mdev->agreed_pro_version; |
| |
| exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) |
| : apv == 88 ? sizeof(struct p_rs_param) |
| + SHARED_SECRET_MAX |
| : apv <= 94 ? sizeof(struct p_rs_param_89) |
| : /* apv >= 95 */ sizeof(struct p_rs_param_95); |
| |
| if (h->length > exp_max_sz) { |
| dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", |
| h->length, exp_max_sz); |
| return FALSE; |
| } |
| |
| if (apv <= 88) { |
| header_size = sizeof(struct p_rs_param) - sizeof(*h); |
| data_size = h->length - header_size; |
| } else if (apv <= 94) { |
| header_size = sizeof(struct p_rs_param_89) - sizeof(*h); |
| data_size = h->length - header_size; |
| D_ASSERT(data_size == 0); |
| } else { |
| header_size = sizeof(struct p_rs_param_95) - sizeof(*h); |
| data_size = h->length - header_size; |
| D_ASSERT(data_size == 0); |
| } |
| |
| /* initialize verify_alg and csums_alg */ |
| memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); |
| |
| if (drbd_recv(mdev, h->payload, header_size) != header_size) |
| return FALSE; |
| |
| mdev->sync_conf.rate = be32_to_cpu(p->rate); |
| |
| if (apv >= 88) { |
| if (apv == 88) { |
| if (data_size > SHARED_SECRET_MAX) { |
| dev_err(DEV, "verify-alg too long, " |
| "peer wants %u, accepting only %u byte\n", |
| data_size, SHARED_SECRET_MAX); |
| return FALSE; |
| } |
| |
| if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) |
| return FALSE; |
| |
| /* we expect NUL terminated string */ |
| /* but just in case someone tries to be evil */ |
| D_ASSERT(p->verify_alg[data_size-1] == 0); |
| p->verify_alg[data_size-1] = 0; |
| |
| } else /* apv >= 89 */ { |
| /* we still expect NUL terminated strings */ |
| /* but just in case someone tries to be evil */ |
| D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); |
| D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); |
| p->verify_alg[SHARED_SECRET_MAX-1] = 0; |
| p->csums_alg[SHARED_SECRET_MAX-1] = 0; |
| } |
| |
| if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { |
| if (mdev->state.conn == C_WF_REPORT_PARAMS) { |
| dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", |
| mdev->sync_conf.verify_alg, p->verify_alg); |
| goto disconnect; |
| } |
| verify_tfm = drbd_crypto_alloc_digest_safe(mdev, |
| p->verify_alg, "verify-alg"); |
| if (IS_ERR(verify_tfm)) { |
| verify_tfm = NULL; |
| goto disconnect; |
| } |
| } |
| |
| if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { |
| if (mdev->state.conn == C_WF_REPORT_PARAMS) { |
| dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", |
| mdev->sync_conf.csums_alg, p->csums_alg); |
| goto disconnect; |
| } |
| csums_tfm = drbd_crypto_alloc_digest_safe(mdev, |
| p->csums_alg, "csums-alg"); |
| if (IS_ERR(csums_tfm)) { |
| csums_tfm = NULL; |
| goto disconnect; |
| } |
| } |
| |
| if (apv > 94) { |
| mdev->sync_conf.rate = be32_to_cpu(p->rate); |
| mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); |
| mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target); |
| mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target); |
| mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate); |
| } |
| |
| spin_lock(&mdev->peer_seq_lock); |
| /* lock against drbd_nl_syncer_conf() */ |
| if (verify_tfm) { |
| strcpy(mdev->sync_conf.verify_alg, p->verify_alg); |
| mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; |
| crypto_free_hash(mdev->verify_tfm); |
| mdev->verify_tfm = verify_tfm; |
| dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); |
| } |
| if (csums_tfm) { |
| strcpy(mdev->sync_conf.csums_alg, p->csums_alg); |
| mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; |
| crypto_free_hash(mdev->csums_tfm); |
| mdev->csums_tfm = csums_tfm; |
| dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); |
| } |
| spin_unlock(&mdev->peer_seq_lock); |
| } |
| |
| return ok; |
| disconnect: |
| /* just for completeness: actually not needed, |
| * as this is not reached if csums_tfm was ok. */ |
| crypto_free_hash(csums_tfm); |
| /* but free the verify_tfm again, if csums_tfm did not work out */ |
| crypto_free_hash(verify_tfm); |
| drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| return FALSE; |
| } |
| |
| static void drbd_setup_order_type(struct drbd_conf *mdev, int peer) |
| { |
| /* sorry, we currently have no working implementation |
| * of distributed TCQ */ |
| } |
| |
| /* warn if the arguments differ by more than 12.5% */ |
| static void warn_if_differ_considerably(struct drbd_conf *mdev, |
| const char *s, sector_t a, sector_t b) |
| { |
| sector_t d; |
| if (a == 0 || b == 0) |
| return; |
| d = (a > b) ? (a - b) : (b - a); |
| if (d > (a>>3) || d > (b>>3)) |
| dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, |
| (unsigned long long)a, (unsigned long long)b); |
| } |
| |
| static int receive_sizes(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_sizes *p = (struct p_sizes *)h; |
| enum determine_dev_size dd = unchanged; |
| unsigned int max_seg_s; |
| sector_t p_size, p_usize, my_usize; |
| int ldsc = 0; /* local disk size changed */ |
| enum dds_flags ddsf; |
| |
| ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; |
| if (drbd_recv(mdev, h->payload, h->length) != h->length) |
| return FALSE; |
| |
| p_size = be64_to_cpu(p->d_size); |
| p_usize = be64_to_cpu(p->u_size); |
| |
| if (p_size == 0 && mdev->state.disk == D_DISKLESS) { |
| dev_err(DEV, "some backing storage is needed\n"); |
| drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| return FALSE; |
| } |
| |
| /* just store the peer's disk size for now. |
| * we still need to figure out whether we accept that. */ |
| mdev->p_size = p_size; |
| |
| #define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r)) |
| if (get_ldev(mdev)) { |
| warn_if_differ_considerably(mdev, "lower level device sizes", |
| p_size, drbd_get_max_capacity(mdev->ldev)); |
| warn_if_differ_considerably(mdev, "user requested size", |
| p_usize, mdev->ldev->dc.disk_size); |
| |
| /* if this is the first connect, or an otherwise expected |
| * param exchange, choose the minimum */ |
| if (mdev->state.conn == C_WF_REPORT_PARAMS) |
| p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, |
| p_usize); |
| |
| my_usize = mdev->ldev->dc.disk_size; |
| |
| if (mdev->ldev->dc.disk_size != p_usize) { |
| mdev->ldev->dc.disk_size = p_usize; |
| dev_info(DEV, "Peer sets u_size to %lu sectors\n", |
| (unsigned long)mdev->ldev->dc.disk_size); |
| } |
| |
| /* Never shrink a device with usable data during connect. |
| But allow online shrinking if we are connected. */ |
| if (drbd_new_dev_size(mdev, mdev->ldev, 0) < |
| drbd_get_capacity(mdev->this_bdev) && |
| mdev->state.disk >= D_OUTDATED && |
| mdev->state.conn < C_CONNECTED) { |
| dev_err(DEV, "The peer's disk size is too small!\n"); |
| drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| mdev->ldev->dc.disk_size = my_usize; |
| put_ldev(mdev); |
| return FALSE; |
| } |
| put_ldev(mdev); |
| } |
| #undef min_not_zero |
| |
| ddsf = be16_to_cpu(p->dds_flags); |
| if (get_ldev(mdev)) { |
| dd = drbd_determin_dev_size(mdev, ddsf); |
| put_ldev(mdev); |
| if (dd == dev_size_error) |
| return FALSE; |
| drbd_md_sync(mdev); |
| } else { |
| /* I am diskless, need to accept the peer's size. */ |
| drbd_set_my_capacity(mdev, p_size); |
| } |
| |
| if (get_ldev(mdev)) { |
| if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { |
| mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); |
| ldsc = 1; |
| } |
| |
| if (mdev->agreed_pro_version < 94) |
| max_seg_s = be32_to_cpu(p->max_segment_size); |
| else /* drbd 8.3.8 onwards */ |
| max_seg_s = DRBD_MAX_SEGMENT_SIZE; |
| |
| if (max_seg_s != queue_max_segment_size(mdev->rq_queue)) |
| drbd_setup_queue_param(mdev, max_seg_s); |
| |
| drbd_setup_order_type(mdev, be16_to_cpu(p->queue_order_type)); |
| put_ldev(mdev); |
| } |
| |
| if (mdev->state.conn > C_WF_REPORT_PARAMS) { |
| if (be64_to_cpu(p->c_size) != |
| drbd_get_capacity(mdev->this_bdev) || ldsc) { |
| /* we have different sizes, probably peer |
| * needs to know my new size... */ |
| drbd_send_sizes(mdev, 0, ddsf); |
| } |
| if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || |
| (dd == grew && mdev->state.conn == C_CONNECTED)) { |
| if (mdev->state.pdsk >= D_INCONSISTENT && |
| mdev->state.disk >= D_INCONSISTENT) { |
| if (ddsf & DDSF_NO_RESYNC) |
| dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); |
| else |
| resync_after_online_grow(mdev); |
| } else |
| set_bit(RESYNC_AFTER_NEG, &mdev->flags); |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| static int receive_uuids(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_uuids *p = (struct p_uuids *)h; |
| u64 *p_uuid; |
| int i; |
| |
| ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; |
| if (drbd_recv(mdev, h->payload, h->length) != h->length) |
| return FALSE; |
| |
| p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); |
| |
| for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) |
| p_uuid[i] = be64_to_cpu(p->uuid[i]); |
| |
| kfree(mdev->p_uuid); |
| mdev->p_uuid = p_uuid; |
| |
| if (mdev->state.conn < C_CONNECTED && |
| mdev->state.disk < D_INCONSISTENT && |
| mdev->state.role == R_PRIMARY && |
| (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { |
| dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", |
| (unsigned long long)mdev->ed_uuid); |
| drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| return FALSE; |
| } |
| |
| if (get_ldev(mdev)) { |
| int skip_initial_sync = |
| mdev->state.conn == C_CONNECTED && |
| mdev->agreed_pro_version >= 90 && |
| mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && |
| (p_uuid[UI_FLAGS] & 8); |
| if (skip_initial_sync) { |
| dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); |
| drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, |
| "clear_n_write from receive_uuids"); |
| _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); |
| _drbd_uuid_set(mdev, UI_BITMAP, 0); |
| _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), |
| CS_VERBOSE, NULL); |
| drbd_md_sync(mdev); |
| } |
| put_ldev(mdev); |
| } else if (mdev->state.disk < D_INCONSISTENT && |
| mdev->state.role == R_PRIMARY) { |
| /* I am a diskless primary, the peer just created a new current UUID |
| for me. */ |
| drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); |
| } |
| |
| /* Before we test for the disk state, we should wait until an eventually |
| ongoing cluster wide state change is finished. That is important if |
| we are primary and are detaching from our disk. We need to see the |
| new disk state... */ |
| wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); |
| if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) |
| drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); |
| |
| return TRUE; |
| } |
| |
| /** |
| * convert_state() - Converts the peer's view of the cluster state to our point of view |
| * @ps: The state as seen by the peer. |
| */ |
| static union drbd_state convert_state(union drbd_state ps) |
| { |
| union drbd_state ms; |
| |
| static enum drbd_conns c_tab[] = { |
| [C_CONNECTED] = C_CONNECTED, |
| |
| [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, |
| [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, |
| [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ |
| [C_VERIFY_S] = C_VERIFY_T, |
| [C_MASK] = C_MASK, |
| }; |
| |
| ms.i = ps.i; |
| |
| ms.conn = c_tab[ps.conn]; |
| ms.peer = ps.role; |
| ms.role = ps.peer; |
| ms.pdsk = ps.disk; |
| ms.disk = ps.pdsk; |
| ms.peer_isp = (ps.aftr_isp | ps.user_isp); |
| |
| return ms; |
| } |
| |
| static int receive_req_state(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_req_state *p = (struct p_req_state *)h; |
| union drbd_state mask, val; |
| int rv; |
| |
| ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; |
| if (drbd_recv(mdev, h->payload, h->length) != h->length) |
| return FALSE; |
| |
| mask.i = be32_to_cpu(p->mask); |
| val.i = be32_to_cpu(p->val); |
| |
| if (test_bit(DISCARD_CONCURRENT, &mdev->flags) && |
| test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { |
| drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); |
| return TRUE; |
| } |
| |
| mask = convert_state(mask); |
| val = convert_state(val); |
| |
| rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); |
| |
| drbd_send_sr_reply(mdev, rv); |
| drbd_md_sync(mdev); |
| |
| return TRUE; |
| } |
| |
| static int receive_state(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_state *p = (struct p_state *)h; |
| enum drbd_conns nconn, oconn; |
| union drbd_state ns, peer_state; |
| enum drbd_disk_state real_peer_disk; |
| enum chg_state_flags cs_flags; |
| int rv; |
| |
| ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) |
| return FALSE; |
| |
| if (drbd_recv(mdev, h->payload, h->length) != h->length) |
| return FALSE; |
| |
| peer_state.i = be32_to_cpu(p->state); |
| |
| real_peer_disk = peer_state.disk; |
| if (peer_state.disk == D_NEGOTIATING) { |
| real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; |
| dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); |
| } |
| |
| spin_lock_irq(&mdev->req_lock); |
| retry: |
| oconn = nconn = mdev->state.conn; |
| spin_unlock_irq(&mdev->req_lock); |
| |
| if (nconn == C_WF_REPORT_PARAMS) |
| nconn = C_CONNECTED; |
| |
| if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && |
| get_ldev_if_state(mdev, D_NEGOTIATING)) { |
| int cr; /* consider resync */ |
| |
| /* if we established a new connection */ |
| cr = (oconn < C_CONNECTED); |
| /* if we had an established connection |
| * and one of the nodes newly attaches a disk */ |
| cr |= (oconn == C_CONNECTED && |
| (peer_state.disk == D_NEGOTIATING || |
| mdev->state.disk == D_NEGOTIATING)); |
| /* if we have both been inconsistent, and the peer has been |
| * forced to be UpToDate with --overwrite-data */ |
| cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); |
| /* if we had been plain connected, and the admin requested to |
| * start a sync by "invalidate" or "invalidate-remote" */ |
| cr |= (oconn == C_CONNECTED && |
| (peer_state.conn >= C_STARTING_SYNC_S && |
| peer_state.conn <= C_WF_BITMAP_T)); |
| |
| if (cr) |
| nconn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); |
| |
| put_ldev(mdev); |
| if (nconn == C_MASK) { |
| nconn = C_CONNECTED; |
| if (mdev->state.disk == D_NEGOTIATING) { |
| drbd_force_state(mdev, NS(disk, D_DISKLESS)); |
| } else if (peer_state.disk == D_NEGOTIATING) { |
| dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); |
| peer_state.disk = D_DISKLESS; |
| real_peer_disk = D_DISKLESS; |
| } else { |
| if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) |
| return FALSE; |
| D_ASSERT(oconn == C_WF_REPORT_PARAMS); |
| drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| return FALSE; |
| } |
| } |
| } |
| |
| spin_lock_irq(&mdev->req_lock); |
| if (mdev->state.conn != oconn) |
| goto retry; |
| clear_bit(CONSIDER_RESYNC, &mdev->flags); |
| ns.i = mdev->state.i; |
| ns.conn = nconn; |
| ns.peer = peer_state.role; |
| ns.pdsk = real_peer_disk; |
| ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); |
| if ((nconn == C_CONNECTED || nconn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
| ns.disk = mdev->new_state_tmp.disk; |
| cs_flags = CS_VERBOSE + (oconn < C_CONNECTED && nconn >= C_CONNECTED ? 0 : CS_HARD); |
| if (ns.pdsk == D_CONSISTENT && ns.susp && nconn == C_CONNECTED && oconn < C_CONNECTED && |
| test_bit(NEW_CUR_UUID, &mdev->flags)) { |
| /* Do not allow tl_restart(resend) for a rebooted peer. We can only allow this |
| for temporal network outages! */ |
| spin_unlock_irq(&mdev->req_lock); |
| dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); |
| tl_clear(mdev); |
| drbd_uuid_new_current(mdev); |
| clear_bit(NEW_CUR_UUID, &mdev->flags); |
| drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0)); |
| return FALSE; |
| } |
| rv = _drbd_set_state(mdev, ns, cs_flags, NULL); |
| ns = mdev->state; |
| spin_unlock_irq(&mdev->req_lock); |
| |
| if (rv < SS_SUCCESS) { |
| drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| return FALSE; |
| } |
| |
| if (oconn > C_WF_REPORT_PARAMS) { |
| if (nconn > C_CONNECTED && peer_state.conn <= C_CONNECTED && |
| peer_state.disk != D_NEGOTIATING ) { |
| /* we want resync, peer has not yet decided to sync... */ |
| /* Nowadays only used when forcing a node into primary role and |
| setting its disk to UpToDate with that */ |
| drbd_send_uuids(mdev); |
| drbd_send_state(mdev); |
| } |
| } |
| |
| mdev->net_conf->want_lose = 0; |
| |
| drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ |
| |
| return TRUE; |
| } |
| |
| static int receive_sync_uuid(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_rs_uuid *p = (struct p_rs_uuid *)h; |
| |
| wait_event(mdev->misc_wait, |
| mdev->state.conn == C_WF_SYNC_UUID || |
| mdev->state.conn < C_CONNECTED || |
| mdev->state.disk < D_NEGOTIATING); |
| |
| /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ |
| |
| ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; |
| if (drbd_recv(mdev, h->payload, h->length) != h->length) |
| return FALSE; |
| |
| /* Here the _drbd_uuid_ functions are right, current should |
| _not_ be rotated into the history */ |
| if (get_ldev_if_state(mdev, D_NEGOTIATING)) { |
| _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); |
| _drbd_uuid_set(mdev, UI_BITMAP, 0UL); |
| |
| drbd_start_resync(mdev, C_SYNC_TARGET); |
| |
| put_ldev(mdev); |
| } else |
| dev_err(DEV, "Ignoring SyncUUID packet!\n"); |
| |
| return TRUE; |
| } |
| |
| enum receive_bitmap_ret { OK, DONE, FAILED }; |
| |
| static enum receive_bitmap_ret |
| receive_bitmap_plain(struct drbd_conf *mdev, struct p_header *h, |
| unsigned long *buffer, struct bm_xfer_ctx *c) |
| { |
| unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); |
| unsigned want = num_words * sizeof(long); |
| |
| if (want != h->length) { |
| dev_err(DEV, "%s:want (%u) != h->length (%u)\n", __func__, want, h->length); |
| return FAILED; |
| } |
| if (want == 0) |
| return DONE; |
| if (drbd_recv(mdev, buffer, want) != want) |
| return FAILED; |
| |
| drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); |
| |
| c->word_offset += num_words; |
| c->bit_offset = c->word_offset * BITS_PER_LONG; |
| if (c->bit_offset > c->bm_bits) |
| c->bit_offset = c->bm_bits; |
| |
| return OK; |
| } |
| |
| static enum receive_bitmap_ret |
| recv_bm_rle_bits(struct drbd_conf *mdev, |
| struct p_compressed_bm *p, |
| struct bm_xfer_ctx *c) |
| { |
| struct bitstream bs; |
| u64 look_ahead; |
| u64 rl; |
| u64 tmp; |
| unsigned long s = c->bit_offset; |
| unsigned long e; |
| int len = p->head.length - (sizeof(*p) - sizeof(p->head)); |
| int toggle = DCBP_get_start(p); |
| int have; |
| int bits; |
| |
| bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); |
| |
| bits = bitstream_get_bits(&bs, &look_ahead, 64); |
| if (bits < 0) |
| return FAILED; |
| |
| for (have = bits; have > 0; s += rl, toggle = !toggle) { |
| bits = vli_decode_bits(&rl, look_ahead); |
| if (bits <= 0) |
| return FAILED; |
| |
| if (toggle) { |
| e = s + rl -1; |
| if (e >= c->bm_bits) { |
| dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); |
| return FAILED; |
| } |
| _drbd_bm_set_bits(mdev, s, e); |
| } |
| |
| if (have < bits) { |
| dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", |
| have, bits, look_ahead, |
| (unsigned int)(bs.cur.b - p->code), |
| (unsigned int)bs.buf_len); |
| return FAILED; |
| } |
| look_ahead >>= bits; |
| have -= bits; |
| |
| bits = bitstream_get_bits(&bs, &tmp, 64 - have); |
| if (bits < 0) |
| return FAILED; |
| look_ahead |= tmp << have; |
| have += bits; |
| } |
| |
| c->bit_offset = s; |
| bm_xfer_ctx_bit_to_word_offset(c); |
| |
| return (s == c->bm_bits) ? DONE : OK; |
| } |
| |
| static enum receive_bitmap_ret |
| decode_bitmap_c(struct drbd_conf *mdev, |
| struct p_compressed_bm *p, |
| struct bm_xfer_ctx *c) |
| { |
| if (DCBP_get_code(p) == RLE_VLI_Bits) |
| return recv_bm_rle_bits(mdev, p, c); |
| |
| /* other variants had been implemented for evaluation, |
| * but have been dropped as this one turned out to be "best" |
| * during all our tests. */ |
| |
| dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); |
| drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); |
| return FAILED; |
| } |
| |
| void INFO_bm_xfer_stats(struct drbd_conf *mdev, |
| const char *direction, struct bm_xfer_ctx *c) |
| { |
| /* what would it take to transfer it "plaintext" */ |
| unsigned plain = sizeof(struct p_header) * |
| ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) |
| + c->bm_words * sizeof(long); |
| unsigned total = c->bytes[0] + c->bytes[1]; |
| unsigned r; |
| |
| /* total can not be zero. but just in case: */ |
| if (total == 0) |
| return; |
| |
| /* don't report if not compressed */ |
| if (total >= plain) |
| return; |
| |
| /* total < plain. check for overflow, still */ |
| r = (total > UINT_MAX/1000) ? (total / (plain/1000)) |
| : (1000 * total / plain); |
| |
| if (r > 1000) |
| r = 1000; |
| |
| r = 1000 - r; |
| dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " |
| "total %u; compression: %u.%u%%\n", |
| direction, |
| c->bytes[1], c->packets[1], |
| c->bytes[0], c->packets[0], |
| total, r/10, r % 10); |
| } |
| |
| /* Since we are processing the bitfield from lower addresses to higher, |
| it does not matter if the process it in 32 bit chunks or 64 bit |
| chunks as long as it is little endian. (Understand it as byte stream, |
| beginning with the lowest byte...) If we would use big endian |
| we would need to process it from the highest address to the lowest, |
| in order to be agnostic to the 32 vs 64 bits issue. |
| |
| returns 0 on failure, 1 if we successfully received it. */ |
| static int receive_bitmap(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct bm_xfer_ctx c; |
| void *buffer; |
| enum receive_bitmap_ret ret; |
| int ok = FALSE; |
| |
| wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); |
| |
| drbd_bm_lock(mdev, "receive bitmap"); |
| |
| /* maybe we should use some per thread scratch page, |
| * and allocate that during initial device creation? */ |
| buffer = (unsigned long *) __get_free_page(GFP_NOIO); |
| if (!buffer) { |
| dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); |
| goto out; |
| } |
| |
| c = (struct bm_xfer_ctx) { |
| .bm_bits = drbd_bm_bits(mdev), |
| .bm_words = drbd_bm_words(mdev), |
| }; |
| |
| do { |
| if (h->command == P_BITMAP) { |
| ret = receive_bitmap_plain(mdev, h, buffer, &c); |
| } else if (h->command == P_COMPRESSED_BITMAP) { |
| /* MAYBE: sanity check that we speak proto >= 90, |
| * and the feature is enabled! */ |
| struct p_compressed_bm *p; |
| |
| if (h->length > BM_PACKET_PAYLOAD_BYTES) { |
| dev_err(DEV, "ReportCBitmap packet too large\n"); |
| goto out; |
| } |
| /* use the page buff */ |
| p = buffer; |
| memcpy(p, h, sizeof(*h)); |
| if (drbd_recv(mdev, p->head.payload, h->length) != h->length) |
| goto out; |
| if (p->head.length <= (sizeof(*p) - sizeof(p->head))) { |
| dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", p->head.length); |
| return FAILED; |
| } |
| ret = decode_bitmap_c(mdev, p, &c); |
| } else { |
| dev_warn(DEV, "receive_bitmap: h->command neither ReportBitMap nor ReportCBitMap (is 0x%x)", h->command); |
| goto out; |
| } |
| |
| c.packets[h->command == P_BITMAP]++; |
| c.bytes[h->command == P_BITMAP] += sizeof(struct p_header) + h->length; |
| |
| if (ret != OK) |
| break; |
| |
| if (!drbd_recv_header(mdev, h)) |
| goto out; |
| } while (ret == OK); |
| if (ret == FAILED) |
| goto out; |
| |
| INFO_bm_xfer_stats(mdev, "receive", &c); |
| |
| if (mdev->state.conn == C_WF_BITMAP_T) { |
| ok = !drbd_send_bitmap(mdev); |
| if (!ok) |
| goto out; |
| /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ |
| ok = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
| D_ASSERT(ok == SS_SUCCESS); |
| } else if (mdev->state.conn != C_WF_BITMAP_S) { |
| /* admin may have requested C_DISCONNECTING, |
| * other threads may have noticed network errors */ |
| dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", |
| drbd_conn_str(mdev->state.conn)); |
| } |
| |
| ok = TRUE; |
| out: |
| drbd_bm_unlock(mdev); |
| if (ok && mdev->state.conn == C_WF_BITMAP_S) |
| drbd_start_resync(mdev, C_SYNC_SOURCE); |
| free_page((unsigned long) buffer); |
| return ok; |
| } |
| |
| static int receive_skip_(struct drbd_conf *mdev, struct p_header *h, int silent) |
| { |
| /* TODO zero copy sink :) */ |
| static char sink[128]; |
| int size, want, r; |
| |
| if (!silent) |
| dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", |
| h->command, h->length); |
| |
| size = h->length; |
| while (size > 0) { |
| want = min_t(int, size, sizeof(sink)); |
| r = drbd_recv(mdev, sink, want); |
| ERR_IF(r <= 0) break; |
| size -= r; |
| } |
| return size == 0; |
| } |
| |
| static int receive_skip(struct drbd_conf *mdev, struct p_header *h) |
| { |
| return receive_skip_(mdev, h, 0); |
| } |
| |
| static int receive_skip_silent(struct drbd_conf *mdev, struct p_header *h) |
| { |
| return receive_skip_(mdev, h, 1); |
| } |
| |
| static int receive_UnplugRemote(struct drbd_conf *mdev, struct p_header *h) |
| { |
| if (mdev->state.disk >= D_INCONSISTENT) |
| drbd_kick_lo(mdev); |
| |
| /* Make sure we've acked all the TCP data associated |
| * with the data requests being unplugged */ |
| drbd_tcp_quickack(mdev->data.socket); |
| |
| return TRUE; |
| } |
| |
| typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, struct p_header *); |
| |
| static drbd_cmd_handler_f drbd_default_handler[] = { |
| [P_DATA] = receive_Data, |
| [P_DATA_REPLY] = receive_DataReply, |
| [P_RS_DATA_REPLY] = receive_RSDataReply, |
| [P_BARRIER] = receive_Barrier, |
| [P_BITMAP] = receive_bitmap, |
| [P_COMPRESSED_BITMAP] = receive_bitmap, |
| [P_UNPLUG_REMOTE] = receive_UnplugRemote, |
| [P_DATA_REQUEST] = receive_DataRequest, |
| [P_RS_DATA_REQUEST] = receive_DataRequest, |
| [P_SYNC_PARAM] = receive_SyncParam, |
| [P_SYNC_PARAM89] = receive_SyncParam, |
| [P_PROTOCOL] = receive_protocol, |
| [P_UUIDS] = receive_uuids, |
| [P_SIZES] = receive_sizes, |
| [P_STATE] = receive_state, |
| [P_STATE_CHG_REQ] = receive_req_state, |
| [P_SYNC_UUID] = receive_sync_uuid, |
| [P_OV_REQUEST] = receive_DataRequest, |
| [P_OV_REPLY] = receive_DataRequest, |
| [P_CSUM_RS_REQUEST] = receive_DataRequest, |
| [P_DELAY_PROBE] = receive_skip_silent, |
| /* anything missing from this table is in |
| * the asender_tbl, see get_asender_cmd */ |
| [P_MAX_CMD] = NULL, |
| }; |
| |
| static drbd_cmd_handler_f *drbd_cmd_handler = drbd_default_handler; |
| static drbd_cmd_handler_f *drbd_opt_cmd_handler; |
| |
| static void drbdd(struct drbd_conf *mdev) |
| { |
| drbd_cmd_handler_f handler; |
| struct p_header *header = &mdev->data.rbuf.header; |
| |
| while (get_t_state(&mdev->receiver) == Running) { |
| drbd_thread_current_set_cpu(mdev); |
| if (!drbd_recv_header(mdev, header)) { |
| drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); |
| break; |
| } |
| |
| if (header->command < P_MAX_CMD) |
| handler = drbd_cmd_handler[header->command]; |
| else if (P_MAY_IGNORE < header->command |
| && header->command < P_MAX_OPT_CMD) |
| handler = drbd_opt_cmd_handler[header->command-P_MAY_IGNORE]; |
| else if (header->command > P_MAX_OPT_CMD) |
| handler = receive_skip; |
| else |
| handler = NULL; |
| |
| if (unlikely(!handler)) { |
| dev_err(DEV, "unknown packet type %d, l: %d!\n", |
| header->command, header->length); |
| drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); |
| break; |
| } |
| if (unlikely(!handler(mdev, header))) { |
| dev_err(DEV, "error receiving %s, l: %d!\n", |
| cmdname(header->command), header->length); |
| drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); |
| break; |
| } |
| } |
| } |
| |
| void drbd_flush_workqueue(struct drbd_conf *mdev) |
| { |
| struct drbd_wq_barrier barr; |
| |
| barr.w.cb = w_prev_work_done; |
| init_completion(&barr.done); |
| drbd_queue_work(&mdev->data.work, &barr.w); |
| wait_for_completion(&barr.done); |
| } |
| |
| void drbd_free_tl_hash(struct drbd_conf *mdev) |
| { |
| struct hlist_head *h; |
| |
| spin_lock_irq(&mdev->req_lock); |
| |
| if (!mdev->tl_hash || mdev->state.conn != C_STANDALONE) { |
| spin_unlock_irq(&mdev->req_lock); |
| return; |
| } |
| /* paranoia code */ |
| for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++) |
| if (h->first) |
| dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n", |
| (int)(h - mdev->ee_hash), h->first); |
| kfree(mdev->ee_hash); |
| mdev->ee_hash = NULL; |
| mdev->ee_hash_s = 0; |
| |
| /* paranoia code */ |
| for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++) |
| if (h->first) |
| dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n", |
| (int)(h - mdev->tl_hash), h->first); |
| kfree(mdev->tl_hash); |
| mdev->tl_hash = NULL; |
| mdev->tl_hash_s = 0; |
| spin_unlock_irq(&mdev->req_lock); |
| } |
| |
| static void drbd_disconnect(struct drbd_conf *mdev) |
| { |
| enum drbd_fencing_p fp; |
| union drbd_state os, ns; |
| int rv = SS_UNKNOWN_ERROR; |
| unsigned int i; |
| |
| if (mdev->state.conn == C_STANDALONE) |
| return; |
| if (mdev->state.conn >= C_WF_CONNECTION) |
| dev_err(DEV, "ASSERT FAILED cstate = %s, expected < WFConnection\n", |
| drbd_conn_str(mdev->state.conn)); |
| |
| /* asender does not clean up anything. it must not interfere, either */ |
| drbd_thread_stop(&mdev->asender); |
| drbd_free_sock(mdev); |
| |
| spin_lock_irq(&mdev->req_lock); |
| _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); |
| _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); |
| _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); |
| spin_unlock_irq(&mdev->req_lock); |
| |
| /* We do not have data structures that would allow us to |
| * get the rs_pending_cnt down to 0 again. |
| * * On C_SYNC_TARGET we do not have any data structures describing |
| * the pending RSDataRequest's we have sent. |
| * * On C_SYNC_SOURCE there is no data structure that tracks |
| * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. |
| * And no, it is not the sum of the reference counts in the |
| * resync_LRU. The resync_LRU tracks the whole operation including |
| * the disk-IO, while the rs_pending_cnt only tracks the blocks |
| * on the fly. */ |
| drbd_rs_cancel_all(mdev); |
| mdev->rs_total = 0; |
| mdev->rs_failed = 0; |
| atomic_set(&mdev->rs_pending_cnt, 0); |
| wake_up(&mdev->misc_wait); |
| |
| /* make sure syncer is stopped and w_resume_next_sg queued */ |
| del_timer_sync(&mdev->resync_timer); |
| set_bit(STOP_SYNC_TIMER, &mdev->flags); |
| resync_timer_fn((unsigned long)mdev); |
| |
| /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
| * w_make_resync_request etc. which may still be on the worker queue |
| * to be "canceled" */ |
| drbd_flush_workqueue(mdev); |
| |
| /* This also does reclaim_net_ee(). If we do this too early, we might |
| * miss some resync ee and pages.*/ |
| drbd_process_done_ee(mdev); |
| |
| kfree(mdev->p_uuid); |
| mdev->p_uuid = NULL; |
| |
| if (!mdev->state.susp) |
| tl_clear(mdev); |
| |
| dev_info(DEV, "Connection closed\n"); |
| |
| drbd_md_sync(mdev); |
| |
| fp = FP_DONT_CARE; |
| if (get_ldev(mdev)) { |
| fp = mdev->ldev->dc.fencing; |
| put_ldev(mdev); |
| } |
| |
| if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) |
| drbd_try_outdate_peer_async(mdev); |
| |
| spin_lock_irq(&mdev->req_lock); |
| os = mdev->state; |
| if (os.conn >= C_UNCONNECTED) { |
| /* Do not restart in case we are C_DISCONNECTING */ |
| ns = os; |
| ns.conn = C_UNCONNECTED; |
| rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); |
| } |
| spin_unlock_irq(&mdev->req_lock); |
| |
| if (os.conn == C_DISCONNECTING) { |
| wait_event(mdev->net_cnt_wait, atomic_read(&mdev->net_cnt) == 0); |
| |
| if (!mdev->state.susp) { |
| /* we must not free the tl_hash |
| * while application io is still on the fly */ |
| wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); |
| drbd_free_tl_hash(mdev); |
| } |
| |
| crypto_free_hash(mdev->cram_hmac_tfm); |
| mdev->cram_hmac_tfm = NULL; |
| |
| kfree(mdev->net_conf); |
| mdev->net_conf = NULL; |
| drbd_request_state(mdev, NS(conn, C_STANDALONE)); |
| } |
| |
| /* tcp_close and release of sendpage pages can be deferred. I don't |
| * want to use SO_LINGER, because apparently it can be deferred for |
| * more than 20 seconds (longest time I checked). |
| * |
| * Actually we don't care for exactly when the network stack does its |
| * put_page(), but release our reference on these pages right here. |
| */ |
| i = drbd_release_ee(mdev, &mdev->net_ee); |
| if (i) |
| dev_info(DEV, "net_ee not empty, killed %u entries\n", i); |
| i = atomic_read(&mdev->pp_in_use); |
| if (i) |
| dev_info(DEV, "pp_in_use = %d, expected 0\n", i); |
| |
| D_ASSERT(list_empty(&mdev->read_ee)); |
| D_ASSERT(list_empty(&mdev->active_ee)); |
| D_ASSERT(list_empty(&mdev->sync_ee)); |
| D_ASSERT(list_empty(&mdev->done_ee)); |
| |
| /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ |
| atomic_set(&mdev->current_epoch->epoch_size, 0); |
| D_ASSERT(list_empty(&mdev->current_epoch->list)); |
| } |
| |
| /* |
| * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version |
| * we can agree on is stored in agreed_pro_version. |
| * |
| * feature flags and the reserved array should be enough room for future |
| * enhancements of the handshake protocol, and possible plugins... |
| * |
| * for now, they are expected to be zero, but ignored. |
| */ |
| static int drbd_send_handshake(struct drbd_conf *mdev) |
| { |
| /* ASSERT current == mdev->receiver ... */ |
| struct p_handshake *p = &mdev->data.sbuf.handshake; |
| int ok; |
| |
| if (mutex_lock_interruptible(&mdev->data.mutex)) { |
| dev_err(DEV, "interrupted during initial handshake\n"); |
| return 0; /* interrupted. not ok. */ |
| } |
| |
| if (mdev->data.socket == NULL) { |
| mutex_unlock(&mdev->data.mutex); |
| return 0; |
| } |
| |
| memset(p, 0, sizeof(*p)); |
| p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); |
| p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); |
| ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE, |
| (struct p_header *)p, sizeof(*p), 0 ); |
| mutex_unlock(&mdev->data.mutex); |
| return ok; |
| } |
| |
| /* |
| * return values: |
| * 1 yes, we have a valid connection |
| * 0 oops, did not work out, please try again |
| * -1 peer talks different language, |
| * no point in trying again, please go standalone. |
| */ |
| static int drbd_do_handshake(struct drbd_conf *mdev) |
| { |
| /* ASSERT current == mdev->receiver ... */ |
| struct p_handshake *p = &mdev->data.rbuf.handshake; |
| const int expect = sizeof(struct p_handshake) |
| -sizeof(struct p_header); |
| int rv; |
| |
| rv = drbd_send_handshake(mdev); |
| if (!rv) |
| return 0; |
| |
| rv = drbd_recv_header(mdev, &p->head); |
| if (!rv) |
| return 0; |
| |
| if (p->head.command != P_HAND_SHAKE) { |
| dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", |
| cmdname(p->head.command), p->head.command); |
| return -1; |
| } |
| |
| if (p->head.length != expect) { |
| dev_err(DEV, "expected HandShake length: %u, received: %u\n", |
| expect, p->head.length); |
| return -1; |
| } |
| |
| rv = drbd_recv(mdev, &p->head.payload, expect); |
| |
| if (rv != expect) { |
| dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv); |
| return 0; |
| } |
| |
| p->protocol_min = be32_to_cpu(p->protocol_min); |
| p->protocol_max = be32_to_cpu(p->protocol_max); |
| if (p->protocol_max == 0) |
| p->protocol_max = p->protocol_min; |
| |
| if (PRO_VERSION_MAX < p->protocol_min || |
| PRO_VERSION_MIN > p->protocol_max) |
| goto incompat; |
| |
| mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); |
| |
| dev_info(DEV, "Handshake successful: " |
| "Agreed network protocol version %d\n", mdev->agreed_pro_version); |
| |
| return 1; |
| |
| incompat: |
| dev_err(DEV, "incompatible DRBD dialects: " |
| "I support %d-%d, peer supports %d-%d\n", |
| PRO_VERSION_MIN, PRO_VERSION_MAX, |
| p->protocol_min, p->protocol_max); |
| return -1; |
| } |
| |
| #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) |
| static int drbd_do_auth(struct drbd_conf *mdev) |
| { |
| dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); |
| dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); |
| return -1; |
| } |
| #else |
| #define CHALLENGE_LEN 64 |
| |
| /* Return value: |
| 1 - auth succeeded, |
| 0 - failed, try again (network error), |
| -1 - auth failed, don't try again. |
| */ |
| |
| static int drbd_do_auth(struct drbd_conf *mdev) |
| { |
| char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ |
| struct scatterlist sg; |
| char *response = NULL; |
| char *right_response = NULL; |
| char *peers_ch = NULL; |
| struct p_header p; |
| unsigned int key_len = strlen(mdev->net_conf->shared_secret); |
| unsigned int resp_size; |
| struct hash_desc desc; |
| int rv; |
| |
| desc.tfm = mdev->cram_hmac_tfm; |
| desc.flags = 0; |
| |
| rv = crypto_hash_setkey(mdev->cram_hmac_tfm, |
| (u8 *)mdev->net_conf->shared_secret, key_len); |
| if (rv) { |
| dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); |
| rv = -1; |
| goto fail; |
| } |
| |
| get_random_bytes(my_challenge, CHALLENGE_LEN); |
| |
| rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); |
| if (!rv) |
| goto fail; |
| |
| rv = drbd_recv_header(mdev, &p); |
| if (!rv) |
| goto fail; |
| |
| if (p.command != P_AUTH_CHALLENGE) { |
| dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", |
| cmdname(p.command), p.command); |
| rv = 0; |
| goto fail; |
| } |
| |
| if (p.length > CHALLENGE_LEN*2) { |
| dev_err(DEV, "expected AuthChallenge payload too big.\n"); |
| rv = -1; |
| goto fail; |
| } |
| |
| peers_ch = kmalloc(p.length, GFP_NOIO); |
| if (peers_ch == NULL) { |
| dev_err(DEV, "kmalloc of peers_ch failed\n"); |
| rv = -1; |
| goto fail; |
| } |
| |
| rv = drbd_recv(mdev, peers_ch, p.length); |
| |
| if (rv != p.length) { |
| dev_err(DEV, "short read AuthChallenge: l=%u\n", rv); |
| rv = 0; |
| goto fail; |
| } |
| |
| resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm); |
| response = kmalloc(resp_size, GFP_NOIO); |
| if (response == NULL) { |
| dev_err(DEV, "kmalloc of response failed\n"); |
| rv = -1; |
| goto fail; |
| } |
| |
| sg_init_table(&sg, 1); |
| sg_set_buf(&sg, peers_ch, p.length); |
| |
| rv = crypto_hash_digest(&desc, &sg, sg.length, response); |
| if (rv) { |
| dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); |
| rv = -1; |
| goto fail; |
| } |
| |
| rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); |
| if (!rv) |
| goto fail; |
| |
| rv = drbd_recv_header(mdev, &p); |
| if (!rv) |
| goto fail; |
| |
| if (p.command != P_AUTH_RESPONSE) { |
| dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", |
| cmdname(p.command), p.command); |
| rv = 0; |
| goto fail; |
| } |
| |
| if (p.length != resp_size) { |
| dev_err(DEV, "expected AuthResponse payload of wrong size\n"); |
| rv = 0; |
| goto fail; |
| } |
| |
| rv = drbd_recv(mdev, response , resp_size); |
| |
| if (rv != resp_size) { |
| dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv); |
| rv = 0; |
| goto fail; |
| } |
| |
| right_response = kmalloc(resp_size, GFP_NOIO); |
| if (right_response == NULL) { |
| dev_err(DEV, "kmalloc of right_response failed\n"); |
| rv = -1; |
| goto fail; |
| } |
| |
| sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); |
| |
| rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); |
| if (rv) { |
| dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); |
| rv = -1; |
| goto fail; |
| } |
| |
| rv = !memcmp(response, right_response, resp_size); |
| |
| if (rv) |
| dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", |
| resp_size, mdev->net_conf->cram_hmac_alg); |
| else |
| rv = -1; |
| |
| fail: |
| kfree(peers_ch); |
| kfree(response); |
| kfree(right_response); |
| |
| return rv; |
| } |
| #endif |
| |
| int drbdd_init(struct drbd_thread *thi) |
| { |
| struct drbd_conf *mdev = thi->mdev; |
| unsigned int minor = mdev_to_minor(mdev); |
| int h; |
| |
| sprintf(current->comm, "drbd%d_receiver", minor); |
| |
| dev_info(DEV, "receiver (re)started\n"); |
| |
| do { |
| h = drbd_connect(mdev); |
| if (h == 0) { |
| drbd_disconnect(mdev); |
| __set_current_state(TASK_INTERRUPTIBLE); |
| schedule_timeout(HZ); |
| } |
| if (h == -1) { |
| dev_warn(DEV, "Discarding network configuration.\n"); |
| drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| } |
| } while (h == 0); |
| |
| if (h > 0) { |
| if (get_net_conf(mdev)) { |
| drbdd(mdev); |
| put_net_conf(mdev); |
| } |
| } |
| |
| drbd_disconnect(mdev); |
| |
| dev_info(DEV, "receiver terminated\n"); |
| return 0; |
| } |
| |
| /* ********* acknowledge sender ******** */ |
| |
| static int got_RqSReply(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_req_state_reply *p = (struct p_req_state_reply *)h; |
| |
| int retcode = be32_to_cpu(p->retcode); |
| |
| if (retcode >= SS_SUCCESS) { |
| set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); |
| } else { |
| set_bit(CL_ST_CHG_FAIL, &mdev->flags); |
| dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", |
| drbd_set_st_err_str(retcode), retcode); |
| } |
| wake_up(&mdev->state_wait); |
| |
| return TRUE; |
| } |
| |
| static int got_Ping(struct drbd_conf *mdev, struct p_header *h) |
| { |
| return drbd_send_ping_ack(mdev); |
| |
| } |
| |
| static int got_PingAck(struct drbd_conf *mdev, struct p_header *h) |
| { |
| /* restore idle timeout */ |
| mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; |
| if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags)) |
| wake_up(&mdev->misc_wait); |
| |
| return TRUE; |
| } |
| |
| static int got_IsInSync(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_block_ack *p = (struct p_block_ack *)h; |
| sector_t sector = be64_to_cpu(p->sector); |
| int blksize = be32_to_cpu(p->blksize); |
| |
| D_ASSERT(mdev->agreed_pro_version >= 89); |
| |
| update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
| |
| drbd_rs_complete_io(mdev, sector); |
| drbd_set_in_sync(mdev, sector, blksize); |
| /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ |
| mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); |
| dec_rs_pending(mdev); |
| |
| return TRUE; |
| } |
| |
| /* when we receive the ACK for a write request, |
| * verify that we actually know about it */ |
| static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev, |
| u64 id, sector_t sector) |
| { |
| struct hlist_head *slot = tl_hash_slot(mdev, sector); |
| struct hlist_node *n; |
| struct drbd_request *req; |
| |
| hlist_for_each_entry(req, n, slot, colision) { |
| if ((unsigned long)req == (unsigned long)id) { |
| if (req->sector != sector) { |
| dev_err(DEV, "_ack_id_to_req: found req %p but it has " |
| "wrong sector (%llus versus %llus)\n", req, |
| (unsigned long long)req->sector, |
| (unsigned long long)sector); |
| break; |
| } |
| return req; |
| } |
| } |
| dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n", |
| (void *)(unsigned long)id, (unsigned long long)sector); |
| return NULL; |
| } |
| |
| typedef struct drbd_request *(req_validator_fn) |
| (struct drbd_conf *mdev, u64 id, sector_t sector); |
| |
| static int validate_req_change_req_state(struct drbd_conf *mdev, |
| u64 id, sector_t sector, req_validator_fn validator, |
| const char *func, enum drbd_req_event what) |
| { |
| struct drbd_request *req; |
| struct bio_and_error m; |
| |
| spin_lock_irq(&mdev->req_lock); |
| req = validator(mdev, id, sector); |
| if (unlikely(!req)) { |
| spin_unlock_irq(&mdev->req_lock); |
| dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func); |
| return FALSE; |
| } |
| __req_mod(req, what, &m); |
| spin_unlock_irq(&mdev->req_lock); |
| |
| if (m.bio) |
| complete_master_bio(mdev, &m); |
| return TRUE; |
| } |
| |
| static int got_BlockAck(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_block_ack *p = (struct p_block_ack *)h; |
| sector_t sector = be64_to_cpu(p->sector); |
| int blksize = be32_to_cpu(p->blksize); |
| enum drbd_req_event what; |
| |
| update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
| |
| if (is_syncer_block_id(p->block_id)) { |
| drbd_set_in_sync(mdev, sector, blksize); |
| dec_rs_pending(mdev); |
| return TRUE; |
| } |
| switch (be16_to_cpu(h->command)) { |
| case P_RS_WRITE_ACK: |
| D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); |
| what = write_acked_by_peer_and_sis; |
| break; |
| case P_WRITE_ACK: |
| D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); |
| what = write_acked_by_peer; |
| break; |
| case P_RECV_ACK: |
| D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B); |
| what = recv_acked_by_peer; |
| break; |
| case P_DISCARD_ACK: |
| D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); |
| what = conflict_discarded_by_peer; |
| break; |
| default: |
| D_ASSERT(0); |
| return FALSE; |
| } |
| |
| return validate_req_change_req_state(mdev, p->block_id, sector, |
| _ack_id_to_req, __func__ , what); |
| } |
| |
| static int got_NegAck(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_block_ack *p = (struct p_block_ack *)h; |
| sector_t sector = be64_to_cpu(p->sector); |
| |
| if (__ratelimit(&drbd_ratelimit_state)) |
| dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n"); |
| |
| update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
| |
| if (is_syncer_block_id(p->block_id)) { |
| int size = be32_to_cpu(p->blksize); |
| dec_rs_pending(mdev); |
| drbd_rs_failed_io(mdev, sector, size); |
| return TRUE; |
| } |
| return validate_req_change_req_state(mdev, p->block_id, sector, |
| _ack_id_to_req, __func__ , neg_acked); |
| } |
| |
| static int got_NegDReply(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_block_ack *p = (struct p_block_ack *)h; |
| sector_t sector = be64_to_cpu(p->sector); |
| |
| update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
| dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", |
| (unsigned long long)sector, be32_to_cpu(p->blksize)); |
| |
| return validate_req_change_req_state(mdev, p->block_id, sector, |
| _ar_id_to_req, __func__ , neg_acked); |
| } |
| |
| static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header *h) |
| { |
| sector_t sector; |
| int size; |
| struct p_block_ack *p = (struct p_block_ack *)h; |
| |
| sector = be64_to_cpu(p->sector); |
| size = be32_to_cpu(p->blksize); |
| |
| update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
| |
| dec_rs_pending(mdev); |
| |
| if (get_ldev_if_state(mdev, D_FAILED)) { |
| drbd_rs_complete_io(mdev, sector); |
| drbd_rs_failed_io(mdev, sector, size); |
| put_ldev(mdev); |
| } |
| |
| return TRUE; |
| } |
| |
| static int got_BarrierAck(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_barrier_ack *p = (struct p_barrier_ack *)h; |
| |
| tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); |
| |
| return TRUE; |
| } |
| |
| static int got_OVResult(struct drbd_conf *mdev, struct p_header *h) |
| { |
| struct p_block_ack *p = (struct p_block_ack *)h; |
| struct drbd_work *w; |
| sector_t sector; |
| int size; |
| |
| sector = be64_to_cpu(p->sector); |
| size = be32_to_cpu(p->blksize); |
| |
| update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
| |
| if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) |
| drbd_ov_oos_found(mdev, sector, size); |
| else |
| ov_oos_print(mdev); |
| |
| drbd_rs_complete_io(mdev, sector); |
| dec_rs_pending(mdev); |
| |
| if (--mdev->ov_left == 0) { |
| w = kmalloc(sizeof(*w), GFP_NOIO); |
| if (w) { |
| w->cb = w_ov_finished; |
| drbd_queue_work_front(&mdev->data.work, w); |
| } else { |
| dev_err(DEV, "kmalloc(w) failed."); |
| ov_oos_print(mdev); |
| drbd_resync_finished(mdev); |
| } |
| } |
| return TRUE; |
| } |
| |
| static int got_something_to_ignore_m(struct drbd_conf *mdev, struct p_header *h) |
| { |
| /* IGNORE */ |
| return TRUE; |
| } |
| |
| struct asender_cmd { |
| size_t pkt_size; |
| int (*process)(struct drbd_conf *mdev, struct p_header *h); |
| }; |
| |
| static struct asender_cmd *get_asender_cmd(int cmd) |
| { |
| static struct asender_cmd asender_tbl[] = { |
| /* anything missing from this table is in |
| * the drbd_cmd_handler (drbd_default_handler) table, |
| * see the beginning of drbdd() */ |
| [P_PING] = { sizeof(struct p_header), got_Ping }, |
| [P_PING_ACK] = { sizeof(struct p_header), got_PingAck }, |
| [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
| [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
| [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
| [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
| [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, |
| [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, |
| [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, |
| [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, |
| [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, |
| [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, |
| [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, |
| [P_DELAY_PROBE] = { sizeof(struct p_delay_probe), got_something_to_ignore_m }, |
| [P_MAX_CMD] = { 0, NULL }, |
| }; |
| if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) |
| return NULL; |
| return &asender_tbl[cmd]; |
| } |
| |
| int drbd_asender(struct drbd_thread *thi) |
| { |
| struct drbd_conf *mdev = thi->mdev; |
| struct p_header *h = &mdev->meta.rbuf.header; |
| struct asender_cmd *cmd = NULL; |
| |
| int rv, len; |
| void *buf = h; |
| int received = 0; |
| int expect = sizeof(struct p_header); |
| int empty; |
| |
| sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); |
| |
| current->policy = SCHED_RR; /* Make this a realtime task! */ |
| current->rt_priority = 2; /* more important than all other tasks */ |
| |
| while (get_t_state(thi) == Running) { |
| drbd_thread_current_set_cpu(mdev); |
| if (test_and_clear_bit(SEND_PING, &mdev->flags)) { |
| ERR_IF(!drbd_send_ping(mdev)) goto reconnect; |
| mdev->meta.socket->sk->sk_rcvtimeo = |
| mdev->net_conf->ping_timeo*HZ/10; |
| } |
| |
| /* conditionally cork; |
| * it may hurt latency if we cork without much to send */ |
| if (!mdev->net_conf->no_cork && |
| 3 < atomic_read(&mdev->unacked_cnt)) |
| drbd_tcp_cork(mdev->meta.socket); |
| while (1) { |
| clear_bit(SIGNAL_ASENDER, &mdev->flags); |
| flush_signals(current); |
| if (!drbd_process_done_ee(mdev)) { |
| dev_err(DEV, "process_done_ee() = NOT_OK\n"); |
| goto reconnect; |
| } |
| /* to avoid race with newly queued ACKs */ |
| set_bit(SIGNAL_ASENDER, &mdev->flags); |
| spin_lock_irq(&mdev->req_lock); |
| empty = list_empty(&mdev->done_ee); |
| spin_unlock_irq(&mdev->req_lock); |
| /* new ack may have been queued right here, |
| * but then there is also a signal pending, |
| * and we start over... */ |
| if (empty) |
| break; |
| } |
| /* but unconditionally uncork unless disabled */ |
| if (!mdev->net_conf->no_cork) |
| drbd_tcp_uncork(mdev->meta.socket); |
| |
| /* short circuit, recv_msg would return EINTR anyways. */ |
| if (signal_pending(current)) |
| continue; |
| |
| rv = drbd_recv_short(mdev, mdev->meta.socket, |
| buf, expect-received, 0); |
| clear_bit(SIGNAL_ASENDER, &mdev->flags); |
| |
| flush_signals(current); |
| |
| /* Note: |
| * -EINTR (on meta) we got a signal |
| * -EAGAIN (on meta) rcvtimeo expired |
| * -ECONNRESET other side closed the connection |
| * -ERESTARTSYS (on data) we got a signal |
| * rv < 0 other than above: unexpected error! |
| * rv == expected: full header or command |
| * rv < expected: "woken" by signal during receive |
| * rv == 0 : "connection shut down by peer" |
| */ |
| if (likely(rv > 0)) { |
| received += rv; |
| buf += rv; |
| } else if (rv == 0) { |
| dev_err(DEV, "meta connection shut down by peer.\n"); |
| goto reconnect; |
| } else if (rv == -EAGAIN) { |
| if (mdev->meta.socket->sk->sk_rcvtimeo == |
| mdev->net_conf->ping_timeo*HZ/10) { |
| dev_err(DEV, "PingAck did not arrive in time.\n"); |
| goto reconnect; |
| } |
| set_bit(SEND_PING, &mdev->flags); |
| continue; |
| } else if (rv == -EINTR) { |
| continue; |
| } else { |
| dev_err(DEV, "sock_recvmsg returned %d\n", rv); |
| goto reconnect; |
| } |
| |
| if (received == expect && cmd == NULL) { |
| if (unlikely(h->magic != BE_DRBD_MAGIC)) { |
| dev_err(DEV, "magic?? on meta m: 0x%lx c: %d l: %d\n", |
| (long)be32_to_cpu(h->magic), |
| h->command, h->length); |
| goto reconnect; |
| } |
| cmd = get_asender_cmd(be16_to_cpu(h->command)); |
| len = be16_to_cpu(h->length); |
| if (unlikely(cmd == NULL)) { |
| dev_err(DEV, "unknown command?? on meta m: 0x%lx c: %d l: %d\n", |
| (long)be32_to_cpu(h->magic), |
| h->command, h->length); |
| goto disconnect; |
| } |
| expect = cmd->pkt_size; |
| ERR_IF(len != expect-sizeof(struct p_header)) |
| goto reconnect; |
| } |
| if (received == expect) { |
| D_ASSERT(cmd != NULL); |
| if (!cmd->process(mdev, h)) |
| goto reconnect; |
| |
| buf = h; |
| received = 0; |
| expect = sizeof(struct p_header); |
| cmd = NULL; |
| } |
| } |
| |
| if (0) { |
| reconnect: |
| drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); |
| } |
| if (0) { |
| disconnect: |
| drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| } |
| clear_bit(SIGNAL_ASENDER, &mdev->flags); |
| |
| D_ASSERT(mdev->state.conn < C_CONNECTED); |
| dev_info(DEV, "asender terminated\n"); |
| |
| return 0; |
| } |