| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| 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>. |
| |
| */ |
| |
| |
| #include <linux/module.h> |
| |
| #include <linux/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 <uapi/linux/sched/types.h> |
| #include <linux/sched/signal.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 <linux/part_stat.h> |
| #include "drbd_int.h" |
| #include "drbd_protocol.h" |
| #include "drbd_req.h" |
| #include "drbd_vli.h" |
| |
| #define PRO_FEATURES (DRBD_FF_TRIM|DRBD_FF_THIN_RESYNC|DRBD_FF_WSAME|DRBD_FF_WZEROES) |
| |
| struct packet_info { |
| enum drbd_packet cmd; |
| unsigned int size; |
| unsigned int vnr; |
| void *data; |
| }; |
| |
| enum finish_epoch { |
| FE_STILL_LIVE, |
| FE_DESTROYED, |
| FE_RECYCLED, |
| }; |
| |
| static int drbd_do_features(struct drbd_connection *connection); |
| static int drbd_do_auth(struct drbd_connection *connection); |
| static int drbd_disconnected(struct drbd_peer_device *); |
| static void conn_wait_active_ee_empty(struct drbd_connection *connection); |
| static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *, struct drbd_epoch *, enum epoch_event); |
| static int e_end_block(struct drbd_work *, int); |
| |
| |
| #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_alloc_pages(struct drbd_device *device, |
| unsigned int number) |
| { |
| struct page *page = NULL; |
| struct page *tmp = NULL; |
| unsigned 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_alloc_pages 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; |
| } |
| |
| static void reclaim_finished_net_peer_reqs(struct drbd_device *device, |
| struct list_head *to_be_freed) |
| { |
| struct drbd_peer_request *peer_req, *tmp; |
| |
| /* 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_entry_safe(peer_req, tmp, &device->net_ee, w.list) { |
| if (drbd_peer_req_has_active_page(peer_req)) |
| break; |
| list_move(&peer_req->w.list, to_be_freed); |
| } |
| } |
| |
| static void drbd_reclaim_net_peer_reqs(struct drbd_device *device) |
| { |
| LIST_HEAD(reclaimed); |
| struct drbd_peer_request *peer_req, *t; |
| |
| spin_lock_irq(&device->resource->req_lock); |
| reclaim_finished_net_peer_reqs(device, &reclaimed); |
| spin_unlock_irq(&device->resource->req_lock); |
| list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
| drbd_free_net_peer_req(device, peer_req); |
| } |
| |
| static void conn_reclaim_net_peer_reqs(struct drbd_connection *connection) |
| { |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| if (!atomic_read(&device->pp_in_use_by_net)) |
| continue; |
| |
| kref_get(&device->kref); |
| rcu_read_unlock(); |
| drbd_reclaim_net_peer_reqs(device); |
| kref_put(&device->kref, drbd_destroy_device); |
| rcu_read_lock(); |
| } |
| rcu_read_unlock(); |
| } |
| |
| /** |
| * drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled) |
| * @peer_device: 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. |
| * Possibly retry until DRBD frees sufficient pages somewhere else. |
| * |
| * If this allocation would exceed the max_buffers setting, we throttle |
| * allocation (schedule_timeout) to give the system some room to breathe. |
| * |
| * We do not use max-buffers as hard limit, because it could lead to |
| * congestion and further to a distributed deadlock during online-verify or |
| * (checksum based) resync, if the max-buffers, socket buffer sizes and |
| * resync-rate settings are mis-configured. |
| * |
| * Returns a page chain linked via page->private. |
| */ |
| struct page *drbd_alloc_pages(struct drbd_peer_device *peer_device, unsigned int number, |
| bool retry) |
| { |
| struct drbd_device *device = peer_device->device; |
| struct page *page = NULL; |
| struct net_conf *nc; |
| DEFINE_WAIT(wait); |
| unsigned int mxb; |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(peer_device->connection->net_conf); |
| mxb = nc ? nc->max_buffers : 1000000; |
| rcu_read_unlock(); |
| |
| if (atomic_read(&device->pp_in_use) < mxb) |
| page = __drbd_alloc_pages(device, number); |
| |
| /* Try to keep the fast path fast, but occasionally we need |
| * to reclaim the pages we lended to the network stack. */ |
| if (page && atomic_read(&device->pp_in_use_by_net) > 512) |
| drbd_reclaim_net_peer_reqs(device); |
| |
| while (page == NULL) { |
| prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); |
| |
| drbd_reclaim_net_peer_reqs(device); |
| |
| if (atomic_read(&device->pp_in_use) < mxb) { |
| page = __drbd_alloc_pages(device, number); |
| if (page) |
| break; |
| } |
| |
| if (!retry) |
| break; |
| |
| if (signal_pending(current)) { |
| drbd_warn(device, "drbd_alloc_pages interrupted!\n"); |
| break; |
| } |
| |
| if (schedule_timeout(HZ/10) == 0) |
| mxb = UINT_MAX; |
| } |
| finish_wait(&drbd_pp_wait, &wait); |
| |
| if (page) |
| atomic_add(number, &device->pp_in_use); |
| return page; |
| } |
| |
| /* Must not be used from irq, as that may deadlock: see drbd_alloc_pages. |
| * Is also used from inside an other spin_lock_irq(&resource->req_lock); |
| * Either links the page chain back to the global pool, |
| * or returns all pages to the system. */ |
| static void drbd_free_pages(struct drbd_device *device, struct page *page, int is_net) |
| { |
| atomic_t *a = is_net ? &device->pp_in_use_by_net : &device->pp_in_use; |
| int i; |
| |
| if (page == NULL) |
| return; |
| |
| if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_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); |
| } |
| i = atomic_sub_return(i, a); |
| if (i < 0) |
| drbd_warn(device, "ASSERTION FAILED: %s: %d < 0\n", |
| is_net ? "pp_in_use_by_net" : "pp_in_use", 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_peer_req() |
| drbd_alloc_peer_req() |
| drbd_free_peer_reqs() |
| drbd_ee_fix_bhs() |
| drbd_finish_peer_reqs() |
| drbd_clear_done_ee() |
| drbd_wait_ee_list_empty() |
| */ |
| |
| /* normal: payload_size == request size (bi_size) |
| * w_same: payload_size == logical_block_size |
| * trim: payload_size == 0 */ |
| struct drbd_peer_request * |
| drbd_alloc_peer_req(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
| unsigned int request_size, unsigned int payload_size, gfp_t gfp_mask) __must_hold(local) |
| { |
| struct drbd_device *device = peer_device->device; |
| struct drbd_peer_request *peer_req; |
| struct page *page = NULL; |
| unsigned int nr_pages = PFN_UP(payload_size); |
| |
| if (drbd_insert_fault(device, DRBD_FAULT_AL_EE)) |
| return NULL; |
| |
| peer_req = mempool_alloc(&drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); |
| if (!peer_req) { |
| if (!(gfp_mask & __GFP_NOWARN)) |
| drbd_err(device, "%s: allocation failed\n", __func__); |
| return NULL; |
| } |
| |
| if (nr_pages) { |
| page = drbd_alloc_pages(peer_device, nr_pages, |
| gfpflags_allow_blocking(gfp_mask)); |
| if (!page) |
| goto fail; |
| } |
| |
| memset(peer_req, 0, sizeof(*peer_req)); |
| INIT_LIST_HEAD(&peer_req->w.list); |
| drbd_clear_interval(&peer_req->i); |
| peer_req->i.size = request_size; |
| peer_req->i.sector = sector; |
| peer_req->submit_jif = jiffies; |
| peer_req->peer_device = peer_device; |
| peer_req->pages = page; |
| /* |
| * The block_id is opaque to the receiver. It is not endianness |
| * converted, and sent back to the sender unchanged. |
| */ |
| peer_req->block_id = id; |
| |
| return peer_req; |
| |
| fail: |
| mempool_free(peer_req, &drbd_ee_mempool); |
| return NULL; |
| } |
| |
| void __drbd_free_peer_req(struct drbd_device *device, struct drbd_peer_request *peer_req, |
| int is_net) |
| { |
| might_sleep(); |
| if (peer_req->flags & EE_HAS_DIGEST) |
| kfree(peer_req->digest); |
| drbd_free_pages(device, peer_req->pages, is_net); |
| D_ASSERT(device, atomic_read(&peer_req->pending_bios) == 0); |
| D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
| if (!expect(!(peer_req->flags & EE_CALL_AL_COMPLETE_IO))) { |
| peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; |
| drbd_al_complete_io(device, &peer_req->i); |
| } |
| mempool_free(peer_req, &drbd_ee_mempool); |
| } |
| |
| int drbd_free_peer_reqs(struct drbd_device *device, struct list_head *list) |
| { |
| LIST_HEAD(work_list); |
| struct drbd_peer_request *peer_req, *t; |
| int count = 0; |
| int is_net = list == &device->net_ee; |
| |
| spin_lock_irq(&device->resource->req_lock); |
| list_splice_init(list, &work_list); |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
| __drbd_free_peer_req(device, peer_req, is_net); |
| count++; |
| } |
| return count; |
| } |
| |
| /* |
| * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. |
| */ |
| static int drbd_finish_peer_reqs(struct drbd_device *device) |
| { |
| LIST_HEAD(work_list); |
| LIST_HEAD(reclaimed); |
| struct drbd_peer_request *peer_req, *t; |
| int err = 0; |
| |
| spin_lock_irq(&device->resource->req_lock); |
| reclaim_finished_net_peer_reqs(device, &reclaimed); |
| list_splice_init(&device->done_ee, &work_list); |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
| drbd_free_net_peer_req(device, peer_req); |
| |
| /* possible callbacks here: |
| * e_end_block, and e_end_resync_block, e_send_superseded. |
| * all ignore the last argument. |
| */ |
| list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
| int err2; |
| |
| /* list_del not necessary, next/prev members not touched */ |
| err2 = peer_req->w.cb(&peer_req->w, !!err); |
| if (!err) |
| err = err2; |
| drbd_free_peer_req(device, peer_req); |
| } |
| wake_up(&device->ee_wait); |
| |
| return err; |
| } |
| |
| static void _drbd_wait_ee_list_empty(struct drbd_device *device, |
| 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(&device->ee_wait, &wait, TASK_UNINTERRUPTIBLE); |
| spin_unlock_irq(&device->resource->req_lock); |
| io_schedule(); |
| finish_wait(&device->ee_wait, &wait); |
| spin_lock_irq(&device->resource->req_lock); |
| } |
| } |
| |
| static void drbd_wait_ee_list_empty(struct drbd_device *device, |
| struct list_head *head) |
| { |
| spin_lock_irq(&device->resource->req_lock); |
| _drbd_wait_ee_list_empty(device, head); |
| spin_unlock_irq(&device->resource->req_lock); |
| } |
| |
| static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) |
| { |
| struct kvec iov = { |
| .iov_base = buf, |
| .iov_len = size, |
| }; |
| struct msghdr msg = { |
| .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) |
| }; |
| iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, size); |
| return sock_recvmsg(sock, &msg, msg.msg_flags); |
| } |
| |
| static int drbd_recv(struct drbd_connection *connection, void *buf, size_t size) |
| { |
| int rv; |
| |
| rv = drbd_recv_short(connection->data.socket, buf, size, 0); |
| |
| if (rv < 0) { |
| if (rv == -ECONNRESET) |
| drbd_info(connection, "sock was reset by peer\n"); |
| else if (rv != -ERESTARTSYS) |
| drbd_err(connection, "sock_recvmsg returned %d\n", rv); |
| } else if (rv == 0) { |
| if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
| long t; |
| rcu_read_lock(); |
| t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
| rcu_read_unlock(); |
| |
| t = wait_event_timeout(connection->ping_wait, connection->cstate < C_WF_REPORT_PARAMS, t); |
| |
| if (t) |
| goto out; |
| } |
| drbd_info(connection, "sock was shut down by peer\n"); |
| } |
| |
| if (rv != size) |
| conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD); |
| |
| out: |
| return rv; |
| } |
| |
| static int drbd_recv_all(struct drbd_connection *connection, void *buf, size_t size) |
| { |
| int err; |
| |
| err = drbd_recv(connection, buf, size); |
| if (err != size) { |
| if (err >= 0) |
| err = -EIO; |
| } else |
| err = 0; |
| return err; |
| } |
| |
| static int drbd_recv_all_warn(struct drbd_connection *connection, void *buf, size_t size) |
| { |
| int err; |
| |
| err = drbd_recv_all(connection, buf, size); |
| if (err && !signal_pending(current)) |
| drbd_warn(connection, "short read (expected size %d)\n", (int)size); |
| return err; |
| } |
| |
| /* 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_connection *connection) |
| { |
| const char *what; |
| struct socket *sock; |
| struct sockaddr_in6 src_in6; |
| struct sockaddr_in6 peer_in6; |
| struct net_conf *nc; |
| int err, peer_addr_len, my_addr_len; |
| int sndbuf_size, rcvbuf_size, connect_int; |
| int disconnect_on_error = 1; |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(connection->net_conf); |
| if (!nc) { |
| rcu_read_unlock(); |
| return NULL; |
| } |
| sndbuf_size = nc->sndbuf_size; |
| rcvbuf_size = nc->rcvbuf_size; |
| connect_int = nc->connect_int; |
| rcu_read_unlock(); |
| |
| my_addr_len = min_t(int, connection->my_addr_len, sizeof(src_in6)); |
| memcpy(&src_in6, &connection->my_addr, my_addr_len); |
| |
| if (((struct sockaddr *)&connection->my_addr)->sa_family == AF_INET6) |
| src_in6.sin6_port = 0; |
| else |
| ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ |
| |
| peer_addr_len = min_t(int, connection->peer_addr_len, sizeof(src_in6)); |
| memcpy(&peer_in6, &connection->peer_addr, peer_addr_len); |
| |
| what = "sock_create_kern"; |
| err = sock_create_kern(&init_net, ((struct sockaddr *)&src_in6)->sa_family, |
| SOCK_STREAM, IPPROTO_TCP, &sock); |
| if (err < 0) { |
| sock = NULL; |
| goto out; |
| } |
| |
| sock->sk->sk_rcvtimeo = |
| sock->sk->sk_sndtimeo = connect_int * HZ; |
| drbd_setbufsize(sock, sndbuf_size, 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. |
| */ |
| what = "bind before connect"; |
| err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, 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 *) &peer_in6, 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: |
| drbd_err(connection, "%s failed, err = %d\n", what, err); |
| } |
| if (disconnect_on_error) |
| conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| } |
| |
| return sock; |
| } |
| |
| struct accept_wait_data { |
| struct drbd_connection *connection; |
| struct socket *s_listen; |
| struct completion door_bell; |
| void (*original_sk_state_change)(struct sock *sk); |
| |
| }; |
| |
| static void drbd_incoming_connection(struct sock *sk) |
| { |
| struct accept_wait_data *ad = sk->sk_user_data; |
| void (*state_change)(struct sock *sk); |
| |
| state_change = ad->original_sk_state_change; |
| if (sk->sk_state == TCP_ESTABLISHED) |
| complete(&ad->door_bell); |
| state_change(sk); |
| } |
| |
| static int prepare_listen_socket(struct drbd_connection *connection, struct accept_wait_data *ad) |
| { |
| int err, sndbuf_size, rcvbuf_size, my_addr_len; |
| struct sockaddr_in6 my_addr; |
| struct socket *s_listen; |
| struct net_conf *nc; |
| const char *what; |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(connection->net_conf); |
| if (!nc) { |
| rcu_read_unlock(); |
| return -EIO; |
| } |
| sndbuf_size = nc->sndbuf_size; |
| rcvbuf_size = nc->rcvbuf_size; |
| rcu_read_unlock(); |
| |
| my_addr_len = min_t(int, connection->my_addr_len, sizeof(struct sockaddr_in6)); |
| memcpy(&my_addr, &connection->my_addr, my_addr_len); |
| |
| what = "sock_create_kern"; |
| err = sock_create_kern(&init_net, ((struct sockaddr *)&my_addr)->sa_family, |
| SOCK_STREAM, IPPROTO_TCP, &s_listen); |
| if (err) { |
| s_listen = NULL; |
| goto out; |
| } |
| |
| s_listen->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
| drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); |
| |
| what = "bind before listen"; |
| err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); |
| if (err < 0) |
| goto out; |
| |
| ad->s_listen = s_listen; |
| write_lock_bh(&s_listen->sk->sk_callback_lock); |
| ad->original_sk_state_change = s_listen->sk->sk_state_change; |
| s_listen->sk->sk_state_change = drbd_incoming_connection; |
| s_listen->sk->sk_user_data = ad; |
| write_unlock_bh(&s_listen->sk->sk_callback_lock); |
| |
| what = "listen"; |
| err = s_listen->ops->listen(s_listen, 5); |
| if (err < 0) |
| goto out; |
| |
| return 0; |
| out: |
| if (s_listen) |
| sock_release(s_listen); |
| if (err < 0) { |
| if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { |
| drbd_err(connection, "%s failed, err = %d\n", what, err); |
| conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| } |
| } |
| |
| return -EIO; |
| } |
| |
| static void unregister_state_change(struct sock *sk, struct accept_wait_data *ad) |
| { |
| write_lock_bh(&sk->sk_callback_lock); |
| sk->sk_state_change = ad->original_sk_state_change; |
| sk->sk_user_data = NULL; |
| write_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| static struct socket *drbd_wait_for_connect(struct drbd_connection *connection, struct accept_wait_data *ad) |
| { |
| int timeo, connect_int, err = 0; |
| struct socket *s_estab = NULL; |
| struct net_conf *nc; |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(connection->net_conf); |
| if (!nc) { |
| rcu_read_unlock(); |
| return NULL; |
| } |
| connect_int = nc->connect_int; |
| rcu_read_unlock(); |
| |
| timeo = connect_int * HZ; |
| /* 28.5% random jitter */ |
| timeo += (prandom_u32() & 1) ? timeo / 7 : -timeo / 7; |
| |
| err = wait_for_completion_interruptible_timeout(&ad->door_bell, timeo); |
| if (err <= 0) |
| return NULL; |
| |
| err = kernel_accept(ad->s_listen, &s_estab, 0); |
| if (err < 0) { |
| if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { |
| drbd_err(connection, "accept failed, err = %d\n", err); |
| conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| } |
| } |
| |
| if (s_estab) |
| unregister_state_change(s_estab->sk, ad); |
| |
| return s_estab; |
| } |
| |
| static int decode_header(struct drbd_connection *, void *, struct packet_info *); |
| |
| static int send_first_packet(struct drbd_connection *connection, struct drbd_socket *sock, |
| enum drbd_packet cmd) |
| { |
| if (!conn_prepare_command(connection, sock)) |
| return -EIO; |
| return conn_send_command(connection, sock, cmd, 0, NULL, 0); |
| } |
| |
| static int receive_first_packet(struct drbd_connection *connection, struct socket *sock) |
| { |
| unsigned int header_size = drbd_header_size(connection); |
| struct packet_info pi; |
| struct net_conf *nc; |
| int err; |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(connection->net_conf); |
| if (!nc) { |
| rcu_read_unlock(); |
| return -EIO; |
| } |
| sock->sk->sk_rcvtimeo = nc->ping_timeo * 4 * HZ / 10; |
| rcu_read_unlock(); |
| |
| err = drbd_recv_short(sock, connection->data.rbuf, header_size, 0); |
| if (err != header_size) { |
| if (err >= 0) |
| err = -EIO; |
| return err; |
| } |
| err = decode_header(connection, connection->data.rbuf, &pi); |
| if (err) |
| return err; |
| return pi.cmd; |
| } |
| |
| /** |
| * drbd_socket_okay() - Free the socket if its connection is not okay |
| * @sock: pointer to the pointer to the socket. |
| */ |
| static bool drbd_socket_okay(struct socket **sock) |
| { |
| int rr; |
| char tb[4]; |
| |
| if (!*sock) |
| return false; |
| |
| rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); |
| |
| if (rr > 0 || rr == -EAGAIN) { |
| return true; |
| } else { |
| sock_release(*sock); |
| *sock = NULL; |
| return false; |
| } |
| } |
| |
| static bool connection_established(struct drbd_connection *connection, |
| struct socket **sock1, |
| struct socket **sock2) |
| { |
| struct net_conf *nc; |
| int timeout; |
| bool ok; |
| |
| if (!*sock1 || !*sock2) |
| return false; |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(connection->net_conf); |
| timeout = (nc->sock_check_timeo ?: nc->ping_timeo) * HZ / 10; |
| rcu_read_unlock(); |
| schedule_timeout_interruptible(timeout); |
| |
| ok = drbd_socket_okay(sock1); |
| ok = drbd_socket_okay(sock2) && ok; |
| |
| return ok; |
| } |
| |
| /* Gets called if a connection is established, or if a new minor gets created |
| in a connection */ |
| int drbd_connected(struct drbd_peer_device *peer_device) |
| { |
| struct drbd_device *device = peer_device->device; |
| int err; |
| |
| atomic_set(&device->packet_seq, 0); |
| device->peer_seq = 0; |
| |
| device->state_mutex = peer_device->connection->agreed_pro_version < 100 ? |
| &peer_device->connection->cstate_mutex : |
| &device->own_state_mutex; |
| |
| err = drbd_send_sync_param(peer_device); |
| if (!err) |
| err = drbd_send_sizes(peer_device, 0, 0); |
| if (!err) |
| err = drbd_send_uuids(peer_device); |
| if (!err) |
| err = drbd_send_current_state(peer_device); |
| clear_bit(USE_DEGR_WFC_T, &device->flags); |
| clear_bit(RESIZE_PENDING, &device->flags); |
| atomic_set(&device->ap_in_flight, 0); |
| mod_timer(&device->request_timer, jiffies + HZ); /* just start it here. */ |
| return err; |
| } |
| |
| /* |
| * 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 conn_connect(struct drbd_connection *connection) |
| { |
| struct drbd_socket sock, msock; |
| struct drbd_peer_device *peer_device; |
| struct net_conf *nc; |
| int vnr, timeout, h; |
| bool discard_my_data, ok; |
| enum drbd_state_rv rv; |
| struct accept_wait_data ad = { |
| .connection = connection, |
| .door_bell = COMPLETION_INITIALIZER_ONSTACK(ad.door_bell), |
| }; |
| |
| clear_bit(DISCONNECT_SENT, &connection->flags); |
| if (conn_request_state(connection, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) |
| return -2; |
| |
| mutex_init(&sock.mutex); |
| sock.sbuf = connection->data.sbuf; |
| sock.rbuf = connection->data.rbuf; |
| sock.socket = NULL; |
| mutex_init(&msock.mutex); |
| msock.sbuf = connection->meta.sbuf; |
| msock.rbuf = connection->meta.rbuf; |
| msock.socket = NULL; |
| |
| /* Assume that the peer only understands protocol 80 until we know better. */ |
| connection->agreed_pro_version = 80; |
| |
| if (prepare_listen_socket(connection, &ad)) |
| return 0; |
| |
| do { |
| struct socket *s; |
| |
| s = drbd_try_connect(connection); |
| if (s) { |
| if (!sock.socket) { |
| sock.socket = s; |
| send_first_packet(connection, &sock, P_INITIAL_DATA); |
| } else if (!msock.socket) { |
| clear_bit(RESOLVE_CONFLICTS, &connection->flags); |
| msock.socket = s; |
| send_first_packet(connection, &msock, P_INITIAL_META); |
| } else { |
| drbd_err(connection, "Logic error in conn_connect()\n"); |
| goto out_release_sockets; |
| } |
| } |
| |
| if (connection_established(connection, &sock.socket, &msock.socket)) |
| break; |
| |
| retry: |
| s = drbd_wait_for_connect(connection, &ad); |
| if (s) { |
| int fp = receive_first_packet(connection, s); |
| drbd_socket_okay(&sock.socket); |
| drbd_socket_okay(&msock.socket); |
| switch (fp) { |
| case P_INITIAL_DATA: |
| if (sock.socket) { |
| drbd_warn(connection, "initial packet S crossed\n"); |
| sock_release(sock.socket); |
| sock.socket = s; |
| goto randomize; |
| } |
| sock.socket = s; |
| break; |
| case P_INITIAL_META: |
| set_bit(RESOLVE_CONFLICTS, &connection->flags); |
| if (msock.socket) { |
| drbd_warn(connection, "initial packet M crossed\n"); |
| sock_release(msock.socket); |
| msock.socket = s; |
| goto randomize; |
| } |
| msock.socket = s; |
| break; |
| default: |
| drbd_warn(connection, "Error receiving initial packet\n"); |
| sock_release(s); |
| randomize: |
| if (prandom_u32() & 1) |
| goto retry; |
| } |
| } |
| |
| if (connection->cstate <= C_DISCONNECTING) |
| goto out_release_sockets; |
| if (signal_pending(current)) { |
| flush_signals(current); |
| smp_rmb(); |
| if (get_t_state(&connection->receiver) == EXITING) |
| goto out_release_sockets; |
| } |
| |
| ok = connection_established(connection, &sock.socket, &msock.socket); |
| } while (!ok); |
| |
| if (ad.s_listen) |
| sock_release(ad.s_listen); |
| |
| sock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
| msock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
| |
| sock.socket->sk->sk_allocation = GFP_NOIO; |
| msock.socket->sk->sk_allocation = GFP_NOIO; |
| |
| sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; |
| msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE; |
| |
| /* NOT YET ... |
| * sock.socket->sk->sk_sndtimeo = connection->net_conf->timeout*HZ/10; |
| * sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
| * first set it to the P_CONNECTION_FEATURES timeout, |
| * which we set to 4x the configured ping_timeout. */ |
| rcu_read_lock(); |
| nc = rcu_dereference(connection->net_conf); |
| |
| sock.socket->sk->sk_sndtimeo = |
| sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; |
| |
| msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ; |
| timeout = nc->timeout * HZ / 10; |
| discard_my_data = nc->discard_my_data; |
| rcu_read_unlock(); |
| |
| msock.socket->sk->sk_sndtimeo = timeout; |
| |
| /* we don't want delays. |
| * we use TCP_CORK where appropriate, though */ |
| tcp_sock_set_nodelay(sock.socket->sk); |
| tcp_sock_set_nodelay(msock.socket->sk); |
| |
| connection->data.socket = sock.socket; |
| connection->meta.socket = msock.socket; |
| connection->last_received = jiffies; |
| |
| h = drbd_do_features(connection); |
| if (h <= 0) |
| return h; |
| |
| if (connection->cram_hmac_tfm) { |
| /* drbd_request_state(device, NS(conn, WFAuth)); */ |
| switch (drbd_do_auth(connection)) { |
| case -1: |
| drbd_err(connection, "Authentication of peer failed\n"); |
| return -1; |
| case 0: |
| drbd_err(connection, "Authentication of peer failed, trying again.\n"); |
| return 0; |
| } |
| } |
| |
| connection->data.socket->sk->sk_sndtimeo = timeout; |
| connection->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
| |
| if (drbd_send_protocol(connection) == -EOPNOTSUPP) |
| return -1; |
| |
| /* Prevent a race between resync-handshake and |
| * being promoted to Primary. |
| * |
| * Grab and release the state mutex, so we know that any current |
| * drbd_set_role() is finished, and any incoming drbd_set_role |
| * will see the STATE_SENT flag, and wait for it to be cleared. |
| */ |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
| mutex_lock(peer_device->device->state_mutex); |
| |
| /* avoid a race with conn_request_state( C_DISCONNECTING ) */ |
| spin_lock_irq(&connection->resource->req_lock); |
| set_bit(STATE_SENT, &connection->flags); |
| spin_unlock_irq(&connection->resource->req_lock); |
| |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
| mutex_unlock(peer_device->device->state_mutex); |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| kref_get(&device->kref); |
| rcu_read_unlock(); |
| |
| if (discard_my_data) |
| set_bit(DISCARD_MY_DATA, &device->flags); |
| else |
| clear_bit(DISCARD_MY_DATA, &device->flags); |
| |
| drbd_connected(peer_device); |
| kref_put(&device->kref, drbd_destroy_device); |
| rcu_read_lock(); |
| } |
| rcu_read_unlock(); |
| |
| rv = conn_request_state(connection, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE); |
| if (rv < SS_SUCCESS || connection->cstate != C_WF_REPORT_PARAMS) { |
| clear_bit(STATE_SENT, &connection->flags); |
| return 0; |
| } |
| |
| drbd_thread_start(&connection->ack_receiver); |
| /* opencoded create_singlethread_workqueue(), |
| * to be able to use format string arguments */ |
| connection->ack_sender = |
| alloc_ordered_workqueue("drbd_as_%s", WQ_MEM_RECLAIM, connection->resource->name); |
| if (!connection->ack_sender) { |
| drbd_err(connection, "Failed to create workqueue ack_sender\n"); |
| return 0; |
| } |
| |
| mutex_lock(&connection->resource->conf_update); |
| /* The discard_my_data flag is a single-shot modifier to the next |
| * connection attempt, the handshake of which is now well underway. |
| * No need for rcu style copying of the whole struct |
| * just to clear a single value. */ |
| connection->net_conf->discard_my_data = 0; |
| mutex_unlock(&connection->resource->conf_update); |
| |
| return h; |
| |
| out_release_sockets: |
| if (ad.s_listen) |
| sock_release(ad.s_listen); |
| if (sock.socket) |
| sock_release(sock.socket); |
| if (msock.socket) |
| sock_release(msock.socket); |
| return -1; |
| } |
| |
| static int decode_header(struct drbd_connection *connection, void *header, struct packet_info *pi) |
| { |
| unsigned int header_size = drbd_header_size(connection); |
| |
| if (header_size == sizeof(struct p_header100) && |
| *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { |
| struct p_header100 *h = header; |
| if (h->pad != 0) { |
| drbd_err(connection, "Header padding is not zero\n"); |
| return -EINVAL; |
| } |
| pi->vnr = be16_to_cpu(h->volume); |
| pi->cmd = be16_to_cpu(h->command); |
| pi->size = be32_to_cpu(h->length); |
| } else if (header_size == sizeof(struct p_header95) && |
| *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { |
| struct p_header95 *h = header; |
| pi->cmd = be16_to_cpu(h->command); |
| pi->size = be32_to_cpu(h->length); |
| pi->vnr = 0; |
| } else if (header_size == sizeof(struct p_header80) && |
| *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { |
| struct p_header80 *h = header; |
| pi->cmd = be16_to_cpu(h->command); |
| pi->size = be16_to_cpu(h->length); |
| pi->vnr = 0; |
| } else { |
| drbd_err(connection, "Wrong magic value 0x%08x in protocol version %d\n", |
| be32_to_cpu(*(__be32 *)header), |
| connection->agreed_pro_version); |
| return -EINVAL; |
| } |
| pi->data = header + header_size; |
| return 0; |
| } |
| |
| static void drbd_unplug_all_devices(struct drbd_connection *connection) |
| { |
| if (current->plug == &connection->receiver_plug) { |
| blk_finish_plug(&connection->receiver_plug); |
| blk_start_plug(&connection->receiver_plug); |
| } /* else: maybe just schedule() ?? */ |
| } |
| |
| static int drbd_recv_header(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| void *buffer = connection->data.rbuf; |
| int err; |
| |
| err = drbd_recv_all_warn(connection, buffer, drbd_header_size(connection)); |
| if (err) |
| return err; |
| |
| err = decode_header(connection, buffer, pi); |
| connection->last_received = jiffies; |
| |
| return err; |
| } |
| |
| static int drbd_recv_header_maybe_unplug(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| void *buffer = connection->data.rbuf; |
| unsigned int size = drbd_header_size(connection); |
| int err; |
| |
| err = drbd_recv_short(connection->data.socket, buffer, size, MSG_NOSIGNAL|MSG_DONTWAIT); |
| if (err != size) { |
| /* If we have nothing in the receive buffer now, to reduce |
| * application latency, try to drain the backend queues as |
| * quickly as possible, and let remote TCP know what we have |
| * received so far. */ |
| if (err == -EAGAIN) { |
| tcp_sock_set_quickack(connection->data.socket->sk, 2); |
| drbd_unplug_all_devices(connection); |
| } |
| if (err > 0) { |
| buffer += err; |
| size -= err; |
| } |
| err = drbd_recv_all_warn(connection, buffer, size); |
| if (err) |
| return err; |
| } |
| |
| err = decode_header(connection, connection->data.rbuf, pi); |
| connection->last_received = jiffies; |
| |
| return err; |
| } |
| /* This is blkdev_issue_flush, but asynchronous. |
| * We want to submit to all component volumes in parallel, |
| * then wait for all completions. |
| */ |
| struct issue_flush_context { |
| atomic_t pending; |
| int error; |
| struct completion done; |
| }; |
| struct one_flush_context { |
| struct drbd_device *device; |
| struct issue_flush_context *ctx; |
| }; |
| |
| static void one_flush_endio(struct bio *bio) |
| { |
| struct one_flush_context *octx = bio->bi_private; |
| struct drbd_device *device = octx->device; |
| struct issue_flush_context *ctx = octx->ctx; |
| |
| if (bio->bi_status) { |
| ctx->error = blk_status_to_errno(bio->bi_status); |
| drbd_info(device, "local disk FLUSH FAILED with status %d\n", bio->bi_status); |
| } |
| kfree(octx); |
| bio_put(bio); |
| |
| clear_bit(FLUSH_PENDING, &device->flags); |
| put_ldev(device); |
| kref_put(&device->kref, drbd_destroy_device); |
| |
| if (atomic_dec_and_test(&ctx->pending)) |
| complete(&ctx->done); |
| } |
| |
| static void submit_one_flush(struct drbd_device *device, struct issue_flush_context *ctx) |
| { |
| struct bio *bio = bio_alloc(device->ldev->backing_bdev, 0, |
| REQ_OP_FLUSH | REQ_PREFLUSH, GFP_NOIO); |
| struct one_flush_context *octx = kmalloc(sizeof(*octx), GFP_NOIO); |
| |
| if (!octx) { |
| drbd_warn(device, "Could not allocate a octx, CANNOT ISSUE FLUSH\n"); |
| /* FIXME: what else can I do now? disconnecting or detaching |
| * really does not help to improve the state of the world, either. |
| */ |
| bio_put(bio); |
| |
| ctx->error = -ENOMEM; |
| put_ldev(device); |
| kref_put(&device->kref, drbd_destroy_device); |
| return; |
| } |
| |
| octx->device = device; |
| octx->ctx = ctx; |
| bio->bi_private = octx; |
| bio->bi_end_io = one_flush_endio; |
| |
| device->flush_jif = jiffies; |
| set_bit(FLUSH_PENDING, &device->flags); |
| atomic_inc(&ctx->pending); |
| submit_bio(bio); |
| } |
| |
| static void drbd_flush(struct drbd_connection *connection) |
| { |
| if (connection->resource->write_ordering >= WO_BDEV_FLUSH) { |
| struct drbd_peer_device *peer_device; |
| struct issue_flush_context ctx; |
| int vnr; |
| |
| atomic_set(&ctx.pending, 1); |
| ctx.error = 0; |
| init_completion(&ctx.done); |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| |
| if (!get_ldev(device)) |
| continue; |
| kref_get(&device->kref); |
| rcu_read_unlock(); |
| |
| submit_one_flush(device, &ctx); |
| |
| rcu_read_lock(); |
| } |
| rcu_read_unlock(); |
| |
| /* Do we want to add a timeout, |
| * if disk-timeout is set? */ |
| if (!atomic_dec_and_test(&ctx.pending)) |
| wait_for_completion(&ctx.done); |
| |
| if (ctx.error) { |
| /* would rather check on EOPNOTSUPP, but that is not reliable. |
| * don't try again for ANY return value != 0 |
| * if (rv == -EOPNOTSUPP) */ |
| /* Any error is already reported by bio_endio callback. */ |
| drbd_bump_write_ordering(connection->resource, NULL, WO_DRAIN_IO); |
| } |
| } |
| } |
| |
| /** |
| * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. |
| * @connection: DRBD connection. |
| * @epoch: Epoch object. |
| * @ev: Epoch event. |
| */ |
| static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *connection, |
| struct drbd_epoch *epoch, |
| enum epoch_event ev) |
| { |
| int epoch_size; |
| struct drbd_epoch *next_epoch; |
| enum finish_epoch rv = FE_STILL_LIVE; |
| |
| spin_lock(&connection->epoch_lock); |
| do { |
| next_epoch = NULL; |
| |
| 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); |
| 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) || ev & EV_CLEANUP)) { |
| if (!(ev & EV_CLEANUP)) { |
| spin_unlock(&connection->epoch_lock); |
| drbd_send_b_ack(epoch->connection, epoch->barrier_nr, epoch_size); |
| spin_lock(&connection->epoch_lock); |
| } |
| #if 0 |
| /* FIXME: dec unacked on connection, once we have |
| * something to count pending connection packets in. */ |
| if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) |
| dec_unacked(epoch->connection); |
| #endif |
| |
| if (connection->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); |
| connection->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(&connection->epoch_lock); |
| |
| return rv; |
| } |
| |
| static enum write_ordering_e |
| max_allowed_wo(struct drbd_backing_dev *bdev, enum write_ordering_e wo) |
| { |
| struct disk_conf *dc; |
| |
| dc = rcu_dereference(bdev->disk_conf); |
| |
| if (wo == WO_BDEV_FLUSH && !dc->disk_flushes) |
| wo = WO_DRAIN_IO; |
| if (wo == WO_DRAIN_IO && !dc->disk_drain) |
| wo = WO_NONE; |
| |
| return wo; |
| } |
| |
| /* |
| * drbd_bump_write_ordering() - Fall back to an other write ordering method |
| * @wo: Write ordering method to try. |
| */ |
| void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backing_dev *bdev, |
| enum write_ordering_e wo) |
| { |
| struct drbd_device *device; |
| enum write_ordering_e pwo; |
| int vnr; |
| static char *write_ordering_str[] = { |
| [WO_NONE] = "none", |
| [WO_DRAIN_IO] = "drain", |
| [WO_BDEV_FLUSH] = "flush", |
| }; |
| |
| pwo = resource->write_ordering; |
| if (wo != WO_BDEV_FLUSH) |
| wo = min(pwo, wo); |
| rcu_read_lock(); |
| idr_for_each_entry(&resource->devices, device, vnr) { |
| if (get_ldev(device)) { |
| wo = max_allowed_wo(device->ldev, wo); |
| if (device->ldev == bdev) |
| bdev = NULL; |
| put_ldev(device); |
| } |
| } |
| |
| if (bdev) |
| wo = max_allowed_wo(bdev, wo); |
| |
| rcu_read_unlock(); |
| |
| resource->write_ordering = wo; |
| if (pwo != resource->write_ordering || wo == WO_BDEV_FLUSH) |
| drbd_info(resource, "Method to ensure write ordering: %s\n", write_ordering_str[resource->write_ordering]); |
| } |
| |
| /* |
| * Mapping "discard" to ZEROOUT with UNMAP does not work for us: |
| * Drivers have to "announce" q->limits.max_write_zeroes_sectors, or it |
| * will directly go to fallback mode, submitting normal writes, and |
| * never even try to UNMAP. |
| * |
| * And dm-thin does not do this (yet), mostly because in general it has |
| * to assume that "skip_block_zeroing" is set. See also: |
| * https://www.mail-archive.com/dm-devel%40redhat.com/msg07965.html |
| * https://www.redhat.com/archives/dm-devel/2018-January/msg00271.html |
| * |
| * We *may* ignore the discard-zeroes-data setting, if so configured. |
| * |
| * Assumption is that this "discard_zeroes_data=0" is only because the backend |
| * may ignore partial unaligned discards. |
| * |
| * LVM/DM thin as of at least |
| * LVM version: 2.02.115(2)-RHEL7 (2015-01-28) |
| * Library version: 1.02.93-RHEL7 (2015-01-28) |
| * Driver version: 4.29.0 |
| * still behaves this way. |
| * |
| * For unaligned (wrt. alignment and granularity) or too small discards, |
| * we zero-out the initial (and/or) trailing unaligned partial chunks, |
| * but discard all the aligned full chunks. |
| * |
| * At least for LVM/DM thin, with skip_block_zeroing=false, |
| * the result is effectively "discard_zeroes_data=1". |
| */ |
| /* flags: EE_TRIM|EE_ZEROOUT */ |
| int drbd_issue_discard_or_zero_out(struct drbd_device *device, sector_t start, unsigned int nr_sectors, int flags) |
| { |
| struct block_device *bdev = device->ldev->backing_bdev; |
| sector_t tmp, nr; |
| unsigned int max_discard_sectors, granularity; |
| int alignment; |
| int err = 0; |
| |
| if ((flags & EE_ZEROOUT) || !(flags & EE_TRIM)) |
| goto zero_out; |
| |
| /* Zero-sector (unknown) and one-sector granularities are the same. */ |
| granularity = max(bdev_discard_granularity(bdev) >> 9, 1U); |
| alignment = (bdev_discard_alignment(bdev) >> 9) % granularity; |
| |
| max_discard_sectors = min(bdev_max_discard_sectors(bdev), (1U << 22)); |
| max_discard_sectors -= max_discard_sectors % granularity; |
| if (unlikely(!max_discard_sectors)) |
| goto zero_out; |
| |
| if (nr_sectors < granularity) |
| goto zero_out; |
| |
| tmp = start; |
| if (sector_div(tmp, granularity) != alignment) { |
| if (nr_sectors < 2*granularity) |
| goto zero_out; |
| /* start + gran - (start + gran - align) % gran */ |
| tmp = start + granularity - alignment; |
| tmp = start + granularity - sector_div(tmp, granularity); |
| |
| nr = tmp - start; |
| /* don't flag BLKDEV_ZERO_NOUNMAP, we don't know how many |
| * layers are below us, some may have smaller granularity */ |
| err |= blkdev_issue_zeroout(bdev, start, nr, GFP_NOIO, 0); |
| nr_sectors -= nr; |
| start = tmp; |
| } |
| while (nr_sectors >= max_discard_sectors) { |
| err |= blkdev_issue_discard(bdev, start, max_discard_sectors, |
| GFP_NOIO); |
| nr_sectors -= max_discard_sectors; |
| start += max_discard_sectors; |
| } |
| if (nr_sectors) { |
| /* max_discard_sectors is unsigned int (and a multiple of |
| * granularity, we made sure of that above already); |
| * nr is < max_discard_sectors; |
| * I don't need sector_div here, even though nr is sector_t */ |
| nr = nr_sectors; |
| nr -= (unsigned int)nr % granularity; |
| if (nr) { |
| err |= blkdev_issue_discard(bdev, start, nr, GFP_NOIO); |
| nr_sectors -= nr; |
| start += nr; |
| } |
| } |
| zero_out: |
| if (nr_sectors) { |
| err |= blkdev_issue_zeroout(bdev, start, nr_sectors, GFP_NOIO, |
| (flags & EE_TRIM) ? 0 : BLKDEV_ZERO_NOUNMAP); |
| } |
| return err != 0; |
| } |
| |
| static bool can_do_reliable_discards(struct drbd_device *device) |
| { |
| struct disk_conf *dc; |
| bool can_do; |
| |
| if (!bdev_max_discard_sectors(device->ldev->backing_bdev)) |
| return false; |
| |
| rcu_read_lock(); |
| dc = rcu_dereference(device->ldev->disk_conf); |
| can_do = dc->discard_zeroes_if_aligned; |
| rcu_read_unlock(); |
| return can_do; |
| } |
| |
| static void drbd_issue_peer_discard_or_zero_out(struct drbd_device *device, struct drbd_peer_request *peer_req) |
| { |
| /* If the backend cannot discard, or does not guarantee |
| * read-back zeroes in discarded ranges, we fall back to |
| * zero-out. Unless configuration specifically requested |
| * otherwise. */ |
| if (!can_do_reliable_discards(device)) |
| peer_req->flags |= EE_ZEROOUT; |
| |
| if (drbd_issue_discard_or_zero_out(device, peer_req->i.sector, |
| peer_req->i.size >> 9, peer_req->flags & (EE_ZEROOUT|EE_TRIM))) |
| peer_req->flags |= EE_WAS_ERROR; |
| drbd_endio_write_sec_final(peer_req); |
| } |
| |
| /** |
| * drbd_submit_peer_request() |
| * @device: DRBD device. |
| * @peer_req: peer request |
| * |
| * May spread the pages to multiple bios, |
| * depending on bio_add_page restrictions. |
| * |
| * Returns 0 if all bios have been submitted, |
| * -ENOMEM if we could not allocate enough bios, |
| * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a |
| * single page to an empty bio (which should never happen and likely indicates |
| * that the lower level IO stack is in some way broken). This has been observed |
| * on certain Xen deployments. |
| */ |
| /* TODO allocate from our own bio_set. */ |
| int drbd_submit_peer_request(struct drbd_device *device, |
| struct drbd_peer_request *peer_req, |
| const blk_opf_t opf, const int fault_type) |
| { |
| struct bio *bios = NULL; |
| struct bio *bio; |
| struct page *page = peer_req->pages; |
| sector_t sector = peer_req->i.sector; |
| unsigned int data_size = peer_req->i.size; |
| unsigned int n_bios = 0; |
| unsigned int nr_pages = PFN_UP(data_size); |
| |
| /* TRIM/DISCARD: for now, always use the helper function |
| * blkdev_issue_zeroout(..., discard=true). |
| * It's synchronous, but it does the right thing wrt. bio splitting. |
| * Correctness first, performance later. Next step is to code an |
| * asynchronous variant of the same. |
| */ |
| if (peer_req->flags & (EE_TRIM | EE_ZEROOUT)) { |
| /* wait for all pending IO completions, before we start |
| * zeroing things out. */ |
| conn_wait_active_ee_empty(peer_req->peer_device->connection); |
| /* add it to the active list now, |
| * so we can find it to present it in debugfs */ |
| peer_req->submit_jif = jiffies; |
| peer_req->flags |= EE_SUBMITTED; |
| |
| /* If this was a resync request from receive_rs_deallocated(), |
| * it is already on the sync_ee list */ |
| if (list_empty(&peer_req->w.list)) { |
| spin_lock_irq(&device->resource->req_lock); |
| list_add_tail(&peer_req->w.list, &device->active_ee); |
| spin_unlock_irq(&device->resource->req_lock); |
| } |
| |
| drbd_issue_peer_discard_or_zero_out(device, peer_req); |
| return 0; |
| } |
| |
| /* 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. |
| * |
| * Plain bio_alloc is good enough here, this is no DRBD internally |
| * generated bio, but a bio allocated on behalf of the peer. |
| */ |
| next_bio: |
| bio = bio_alloc(device->ldev->backing_bdev, nr_pages, opf, GFP_NOIO); |
| /* > peer_req->i.sector, unless this is the first bio */ |
| bio->bi_iter.bi_sector = sector; |
| bio->bi_private = peer_req; |
| bio->bi_end_io = drbd_peer_request_endio; |
| |
| bio->bi_next = bios; |
| bios = bio; |
| ++n_bios; |
| |
| page_chain_for_each(page) { |
| unsigned len = min_t(unsigned, data_size, PAGE_SIZE); |
| if (!bio_add_page(bio, page, len, 0)) |
| goto next_bio; |
| data_size -= len; |
| sector += len >> 9; |
| --nr_pages; |
| } |
| D_ASSERT(device, data_size == 0); |
| D_ASSERT(device, page == NULL); |
| |
| atomic_set(&peer_req->pending_bios, n_bios); |
| /* for debugfs: update timestamp, mark as submitted */ |
| peer_req->submit_jif = jiffies; |
| peer_req->flags |= EE_SUBMITTED; |
| do { |
| bio = bios; |
| bios = bios->bi_next; |
| bio->bi_next = NULL; |
| |
| drbd_submit_bio_noacct(device, fault_type, bio); |
| } while (bios); |
| return 0; |
| } |
| |
| static void drbd_remove_epoch_entry_interval(struct drbd_device *device, |
| struct drbd_peer_request *peer_req) |
| { |
| struct drbd_interval *i = &peer_req->i; |
| |
| drbd_remove_interval(&device->write_requests, i); |
| drbd_clear_interval(i); |
| |
| /* Wake up any processes waiting for this peer request to complete. */ |
| if (i->waiting) |
| wake_up(&device->misc_wait); |
| } |
| |
| static void conn_wait_active_ee_empty(struct drbd_connection *connection) |
| { |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| |
| kref_get(&device->kref); |
| rcu_read_unlock(); |
| drbd_wait_ee_list_empty(device, &device->active_ee); |
| kref_put(&device->kref, drbd_destroy_device); |
| rcu_read_lock(); |
| } |
| rcu_read_unlock(); |
| } |
| |
| static int receive_Barrier(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| int rv; |
| struct p_barrier *p = pi->data; |
| struct drbd_epoch *epoch; |
| |
| /* FIXME these are unacked on connection, |
| * not a specific (peer)device. |
| */ |
| connection->current_epoch->barrier_nr = p->barrier; |
| connection->current_epoch->connection = connection; |
| rv = drbd_may_finish_epoch(connection, connection->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 (connection->resource->write_ordering) { |
| case WO_NONE: |
| if (rv == FE_RECYCLED) |
| return 0; |
| |
| /* receiver context, in the writeout path of the other node. |
| * avoid potential distributed deadlock */ |
| epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); |
| if (epoch) |
| break; |
| else |
| drbd_warn(connection, "Allocation of an epoch failed, slowing down\n"); |
| fallthrough; |
| |
| case WO_BDEV_FLUSH: |
| case WO_DRAIN_IO: |
| conn_wait_active_ee_empty(connection); |
| drbd_flush(connection); |
| |
| if (atomic_read(&connection->current_epoch->epoch_size)) { |
| epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); |
| if (epoch) |
| break; |
| } |
| |
| return 0; |
| default: |
| drbd_err(connection, "Strangeness in connection->write_ordering %d\n", |
| connection->resource->write_ordering); |
| return -EIO; |
| } |
| |
| epoch->flags = 0; |
| atomic_set(&epoch->epoch_size, 0); |
| atomic_set(&epoch->active, 0); |
| |
| spin_lock(&connection->epoch_lock); |
| if (atomic_read(&connection->current_epoch->epoch_size)) { |
| list_add(&epoch->list, &connection->current_epoch->list); |
| connection->current_epoch = epoch; |
| connection->epochs++; |
| } else { |
| /* The current_epoch got recycled while we allocated this one... */ |
| kfree(epoch); |
| } |
| spin_unlock(&connection->epoch_lock); |
| |
| return 0; |
| } |
| |
| /* quick wrapper in case payload size != request_size (write same) */ |
| static void drbd_csum_ee_size(struct crypto_shash *h, |
| struct drbd_peer_request *r, void *d, |
| unsigned int payload_size) |
| { |
| unsigned int tmp = r->i.size; |
| r->i.size = payload_size; |
| drbd_csum_ee(h, r, d); |
| r->i.size = tmp; |
| } |
| |
| /* used from receive_RSDataReply (recv_resync_read) |
| * and from receive_Data. |
| * data_size: actual payload ("data in") |
| * for normal writes that is bi_size. |
| * for discards, that is zero. |
| * for write same, it is logical_block_size. |
| * both trim and write same have the bi_size ("data len to be affected") |
| * as extra argument in the packet header. |
| */ |
| static struct drbd_peer_request * |
| read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
| struct packet_info *pi) __must_hold(local) |
| { |
| struct drbd_device *device = peer_device->device; |
| const sector_t capacity = get_capacity(device->vdisk); |
| struct drbd_peer_request *peer_req; |
| struct page *page; |
| int digest_size, err; |
| unsigned int data_size = pi->size, ds; |
| void *dig_in = peer_device->connection->int_dig_in; |
| void *dig_vv = peer_device->connection->int_dig_vv; |
| unsigned long *data; |
| struct p_trim *trim = (pi->cmd == P_TRIM) ? pi->data : NULL; |
| struct p_trim *zeroes = (pi->cmd == P_ZEROES) ? pi->data : NULL; |
| |
| digest_size = 0; |
| if (!trim && peer_device->connection->peer_integrity_tfm) { |
| digest_size = crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm); |
| /* |
| * FIXME: Receive the incoming digest into the receive buffer |
| * here, together with its struct p_data? |
| */ |
| err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size); |
| if (err) |
| return NULL; |
| data_size -= digest_size; |
| } |
| |
| /* assume request_size == data_size, but special case trim. */ |
| ds = data_size; |
| if (trim) { |
| if (!expect(data_size == 0)) |
| return NULL; |
| ds = be32_to_cpu(trim->size); |
| } else if (zeroes) { |
| if (!expect(data_size == 0)) |
| return NULL; |
| ds = be32_to_cpu(zeroes->size); |
| } |
| |
| if (!expect(IS_ALIGNED(ds, 512))) |
| return NULL; |
| if (trim || zeroes) { |
| if (!expect(ds <= (DRBD_MAX_BBIO_SECTORS << 9))) |
| return NULL; |
| } else if (!expect(ds <= DRBD_MAX_BIO_SIZE)) |
| return NULL; |
| |
| /* even though we trust out peer, |
| * we sometimes have to double check. */ |
| if (sector + (ds>>9) > capacity) { |
| drbd_err(device, "request from peer beyond end of local disk: " |
| "capacity: %llus < sector: %llus + size: %u\n", |
| (unsigned long long)capacity, |
| (unsigned long long)sector, ds); |
| 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. */ |
| peer_req = drbd_alloc_peer_req(peer_device, id, sector, ds, data_size, GFP_NOIO); |
| if (!peer_req) |
| return NULL; |
| |
| peer_req->flags |= EE_WRITE; |
| if (trim) { |
| peer_req->flags |= EE_TRIM; |
| return peer_req; |
| } |
| if (zeroes) { |
| peer_req->flags |= EE_ZEROOUT; |
| return peer_req; |
| } |
| |
| /* receive payload size bytes into page chain */ |
| ds = data_size; |
| page = peer_req->pages; |
| page_chain_for_each(page) { |
| unsigned len = min_t(int, ds, PAGE_SIZE); |
| data = kmap(page); |
| err = drbd_recv_all_warn(peer_device->connection, data, len); |
| if (drbd_insert_fault(device, DRBD_FAULT_RECEIVE)) { |
| drbd_err(device, "Fault injection: Corrupting data on receive\n"); |
| data[0] = data[0] ^ (unsigned long)-1; |
| } |
| kunmap(page); |
| if (err) { |
| drbd_free_peer_req(device, peer_req); |
| return NULL; |
| } |
| ds -= len; |
| } |
| |
| if (digest_size) { |
| drbd_csum_ee_size(peer_device->connection->peer_integrity_tfm, peer_req, dig_vv, data_size); |
| if (memcmp(dig_in, dig_vv, digest_size)) { |
| drbd_err(device, "Digest integrity check FAILED: %llus +%u\n", |
| (unsigned long long)sector, data_size); |
| drbd_free_peer_req(device, peer_req); |
| return NULL; |
| } |
| } |
| device->recv_cnt += data_size >> 9; |
| return peer_req; |
| } |
| |
| /* drbd_drain_block() just takes a data block |
| * out of the socket input buffer, and discards it. |
| */ |
| static int drbd_drain_block(struct drbd_peer_device *peer_device, int data_size) |
| { |
| struct page *page; |
| int err = 0; |
| void *data; |
| |
| if (!data_size) |
| return 0; |
| |
| page = drbd_alloc_pages(peer_device, 1, 1); |
| |
| data = kmap(page); |
| while (data_size) { |
| unsigned int len = min_t(int, data_size, PAGE_SIZE); |
| |
| err = drbd_recv_all_warn(peer_device->connection, data, len); |
| if (err) |
| break; |
| data_size -= len; |
| } |
| kunmap(page); |
| drbd_free_pages(peer_device->device, page, 0); |
| return err; |
| } |
| |
| static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_request *req, |
| sector_t sector, int data_size) |
| { |
| struct bio_vec bvec; |
| struct bvec_iter iter; |
| struct bio *bio; |
| int digest_size, err, expect; |
| void *dig_in = peer_device->connection->int_dig_in; |
| void *dig_vv = peer_device->connection->int_dig_vv; |
| |
| digest_size = 0; |
| if (peer_device->connection->peer_integrity_tfm) { |
| digest_size = crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm); |
| err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size); |
| if (err) |
| return err; |
| data_size -= digest_size; |
| } |
| |
| /* optimistically update recv_cnt. if receiving fails below, |
| * we disconnect anyways, and counters will be reset. */ |
| peer_device->device->recv_cnt += data_size>>9; |
| |
| bio = req->master_bio; |
| D_ASSERT(peer_device->device, sector == bio->bi_iter.bi_sector); |
| |
| bio_for_each_segment(bvec, bio, iter) { |
| void *mapped = bvec_kmap_local(&bvec); |
| expect = min_t(int, data_size, bvec.bv_len); |
| err = drbd_recv_all_warn(peer_device->connection, mapped, expect); |
| kunmap_local(mapped); |
| if (err) |
| return err; |
| data_size -= expect; |
| } |
| |
| if (digest_size) { |
| drbd_csum_bio(peer_device->connection->peer_integrity_tfm, bio, dig_vv); |
| if (memcmp(dig_in, dig_vv, digest_size)) { |
| drbd_err(peer_device, "Digest integrity check FAILED. Broken NICs?\n"); |
| return -EINVAL; |
| } |
| } |
| |
| D_ASSERT(peer_device->device, data_size == 0); |
| return 0; |
| } |
| |
| /* |
| * e_end_resync_block() is called in ack_sender context via |
| * drbd_finish_peer_reqs(). |
| */ |
| static int e_end_resync_block(struct drbd_work *w, int unused) |
| { |
| struct drbd_peer_request *peer_req = |
| container_of(w, struct drbd_peer_request, w); |
| struct drbd_peer_device *peer_device = peer_req->peer_device; |
| struct drbd_device *device = peer_device->device; |
| sector_t sector = peer_req->i.sector; |
| int err; |
| |
| D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
| |
| if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
| drbd_set_in_sync(device, sector, peer_req->i.size); |
| err = drbd_send_ack(peer_device, P_RS_WRITE_ACK, peer_req); |
| } else { |
| /* Record failure to sync */ |
| drbd_rs_failed_io(device, sector, peer_req->i.size); |
| |
| err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); |
| } |
| dec_unacked(device); |
| |
| return err; |
| } |
| |
| static int recv_resync_read(struct drbd_peer_device *peer_device, sector_t sector, |
| struct packet_info *pi) __releases(local) |
| { |
| struct drbd_device *device = peer_device->device; |
| struct drbd_peer_request *peer_req; |
| |
| peer_req = read_in_block(peer_device, ID_SYNCER, sector, pi); |
| if (!peer_req) |
| goto fail; |
| |
| dec_rs_pending(device); |
| |
| inc_unacked(device); |
| /* corresponding dec_unacked() in e_end_resync_block() |
| * respective _drbd_clear_done_ee */ |
| |
| peer_req->w.cb = e_end_resync_block; |
| peer_req->submit_jif = jiffies; |
| |
| spin_lock_irq(&device->resource->req_lock); |
| list_add_tail(&peer_req->w.list, &device->sync_ee); |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| atomic_add(pi->size >> 9, &device->rs_sect_ev); |
| if (drbd_submit_peer_request(device, peer_req, REQ_OP_WRITE, |
| DRBD_FAULT_RS_WR) == 0) |
| return 0; |
| |
| /* don't care for the reason here */ |
| drbd_err(device, "submit failed, triggering re-connect\n"); |
| spin_lock_irq(&device->resource->req_lock); |
| list_del(&peer_req->w.list); |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| drbd_free_peer_req(device, peer_req); |
| fail: |
| put_ldev(device); |
| return -EIO; |
| } |
| |
| static struct drbd_request * |
| find_request(struct drbd_device *device, struct rb_root *root, u64 id, |
| sector_t sector, bool missing_ok, const char *func) |
| { |
| struct drbd_request *req; |
| |
| /* Request object according to our peer */ |
| req = (struct drbd_request *)(unsigned long)id; |
| if (drbd_contains_interval(root, sector, &req->i) && req->i.local) |
| return req; |
| if (!missing_ok) { |
| drbd_err(device, "%s: failed to find request 0x%lx, sector %llus\n", func, |
| (unsigned long)id, (unsigned long long)sector); |
| } |
| return NULL; |
| } |
| |
| static int receive_DataReply(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct drbd_request *req; |
| sector_t sector; |
| int err; |
| struct p_data *p = pi->data; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| sector = be64_to_cpu(p->sector); |
| |
| spin_lock_irq(&device->resource->req_lock); |
| req = find_request(device, &device->read_requests, p->block_id, sector, false, __func__); |
| spin_unlock_irq(&device->resource->req_lock); |
| if (unlikely(!req)) |
| return -EIO; |
| |
| /* hlist_del(&req->collision) 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 */ |
| err = recv_dless_read(peer_device, req, sector, pi->size); |
| if (!err) |
| 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 err; |
| } |
| |
| static int receive_RSDataReply(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| sector_t sector; |
| int err; |
| struct p_data *p = pi->data; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| sector = be64_to_cpu(p->sector); |
| D_ASSERT(device, p->block_id == ID_SYNCER); |
| |
| if (get_ldev(device)) { |
| /* data is submitted to disk within recv_resync_read. |
| * corresponding put_ldev done below on error, |
| * or in drbd_peer_request_endio. */ |
| err = recv_resync_read(peer_device, sector, pi); |
| } else { |
| if (__ratelimit(&drbd_ratelimit_state)) |
| drbd_err(device, "Can not write resync data to local disk.\n"); |
| |
| err = drbd_drain_block(peer_device, pi->size); |
| |
| drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); |
| } |
| |
| atomic_add(pi->size >> 9, &device->rs_sect_in); |
| |
| return err; |
| } |
| |
| static void restart_conflicting_writes(struct drbd_device *device, |
| sector_t sector, int size) |
| { |
| struct drbd_interval *i; |
| struct drbd_request *req; |
| |
| drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
| if (!i->local) |
| continue; |
| req = container_of(i, struct drbd_request, i); |
| if (req->rq_state & RQ_LOCAL_PENDING || |
| !(req->rq_state & RQ_POSTPONED)) |
| continue; |
| /* as it is RQ_POSTPONED, this will cause it to |
| * be queued on the retry workqueue. */ |
| __req_mod(req, CONFLICT_RESOLVED, NULL); |
| } |
| } |
| |
| /* |
| * e_end_block() is called in ack_sender context via drbd_finish_peer_reqs(). |
| */ |
| static int e_end_block(struct drbd_work *w, int cancel) |
| { |
| struct drbd_peer_request *peer_req = |
| container_of(w, struct drbd_peer_request, w); |
| struct drbd_peer_device *peer_device = peer_req->peer_device; |
| struct drbd_device *device = peer_device->device; |
| sector_t sector = peer_req->i.sector; |
| int err = 0, pcmd; |
| |
| if (peer_req->flags & EE_SEND_WRITE_ACK) { |
| if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
| pcmd = (device->state.conn >= C_SYNC_SOURCE && |
| device->state.conn <= C_PAUSED_SYNC_T && |
| peer_req->flags & EE_MAY_SET_IN_SYNC) ? |
| P_RS_WRITE_ACK : P_WRITE_ACK; |
| err = drbd_send_ack(peer_device, pcmd, peer_req); |
| if (pcmd == P_RS_WRITE_ACK) |
| drbd_set_in_sync(device, sector, peer_req->i.size); |
| } else { |
| err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); |
| /* we expect it to be marked out of sync anyways... |
| * maybe assert this? */ |
| } |
| dec_unacked(device); |
| } |
| |
| /* 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 (peer_req->flags & EE_IN_INTERVAL_TREE) { |
| spin_lock_irq(&device->resource->req_lock); |
| D_ASSERT(device, !drbd_interval_empty(&peer_req->i)); |
| drbd_remove_epoch_entry_interval(device, peer_req); |
| if (peer_req->flags & EE_RESTART_REQUESTS) |
| restart_conflicting_writes(device, sector, peer_req->i.size); |
| spin_unlock_irq(&device->resource->req_lock); |
| } else |
| D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
| |
| drbd_may_finish_epoch(peer_device->connection, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); |
| |
| return err; |
| } |
| |
| static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) |
| { |
| struct drbd_peer_request *peer_req = |
| container_of(w, struct drbd_peer_request, w); |
| struct drbd_peer_device *peer_device = peer_req->peer_device; |
| int err; |
| |
| err = drbd_send_ack(peer_device, ack, peer_req); |
| dec_unacked(peer_device->device); |
| |
| return err; |
| } |
| |
| static int e_send_superseded(struct drbd_work *w, int unused) |
| { |
| return e_send_ack(w, P_SUPERSEDED); |
| } |
| |
| static int e_send_retry_write(struct drbd_work *w, int unused) |
| { |
| struct drbd_peer_request *peer_req = |
| container_of(w, struct drbd_peer_request, w); |
| struct drbd_connection *connection = peer_req->peer_device->connection; |
| |
| return e_send_ack(w, connection->agreed_pro_version >= 100 ? |
| P_RETRY_WRITE : P_SUPERSEDED); |
| } |
| |
| static bool seq_greater(u32 a, u32 b) |
| { |
| /* |
| * We assume 32-bit wrap-around here. |
| * For 24-bit wrap-around, we would have to shift: |
| * a <<= 8; b <<= 8; |
| */ |
| return (s32)a - (s32)b > 0; |
| } |
| |
| static u32 seq_max(u32 a, u32 b) |
| { |
| return seq_greater(a, b) ? a : b; |
| } |
| |
| static void update_peer_seq(struct drbd_peer_device *peer_device, unsigned int peer_seq) |
| { |
| struct drbd_device *device = peer_device->device; |
| unsigned int newest_peer_seq; |
| |
| if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) { |
| spin_lock(&device->peer_seq_lock); |
| newest_peer_seq = seq_max(device->peer_seq, peer_seq); |
| device->peer_seq = newest_peer_seq; |
| spin_unlock(&device->peer_seq_lock); |
| /* wake up only if we actually changed device->peer_seq */ |
| if (peer_seq == newest_peer_seq) |
| wake_up(&device->seq_wait); |
| } |
| } |
| |
| static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2) |
| { |
| return !((s1 + (l1>>9) <= s2) || (s1 >= s2 + (l2>>9))); |
| } |
| |
| /* maybe change sync_ee into interval trees as well? */ |
| static bool overlapping_resync_write(struct drbd_device *device, struct drbd_peer_request *peer_req) |
| { |
| struct drbd_peer_request *rs_req; |
| bool rv = false; |
| |
| spin_lock_irq(&device->resource->req_lock); |
| list_for_each_entry(rs_req, &device->sync_ee, w.list) { |
| if (overlaps(peer_req->i.sector, peer_req->i.size, |
| rs_req->i.sector, rs_req->i.size)) { |
| rv = true; |
| break; |
| } |
| } |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| return rv; |
| } |
| |
| /* 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 device->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 device->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 wait_for_and_update_peer_seq(struct drbd_peer_device *peer_device, const u32 peer_seq) |
| { |
| struct drbd_device *device = peer_device->device; |
| DEFINE_WAIT(wait); |
| long timeout; |
| int ret = 0, tp; |
| |
| if (!test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) |
| return 0; |
| |
| spin_lock(&device->peer_seq_lock); |
| for (;;) { |
| if (!seq_greater(peer_seq - 1, device->peer_seq)) { |
| device->peer_seq = seq_max(device->peer_seq, peer_seq); |
| break; |
| } |
| |
| if (signal_pending(current)) { |
| ret = -ERESTARTSYS; |
| break; |
| } |
| |
| rcu_read_lock(); |
| tp = rcu_dereference(peer_device->connection->net_conf)->two_primaries; |
| rcu_read_unlock(); |
| |
| if (!tp) |
| break; |
| |
| /* Only need to wait if two_primaries is enabled */ |
| prepare_to_wait(&device->seq_wait, &wait, TASK_INTERRUPTIBLE); |
| spin_unlock(&device->peer_seq_lock); |
| rcu_read_lock(); |
| timeout = rcu_dereference(peer_device->connection->net_conf)->ping_timeo*HZ/10; |
| rcu_read_unlock(); |
| timeout = schedule_timeout(timeout); |
| spin_lock(&device->peer_seq_lock); |
| if (!timeout) { |
| ret = -ETIMEDOUT; |
| drbd_err(device, "Timed out waiting for missing ack packets; disconnecting\n"); |
| break; |
| } |
| } |
| spin_unlock(&device->peer_seq_lock); |
| finish_wait(&device->seq_wait, &wait); |
| return ret; |
| } |
| |
| /* see also bio_flags_to_wire() |
| * DRBD_REQ_*, because we need to semantically map the flags to data packet |
| * flags and back. We may replicate to other kernel versions. */ |
| static blk_opf_t wire_flags_to_bio_flags(u32 dpf) |
| { |
| return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | |
| (dpf & DP_FUA ? REQ_FUA : 0) | |
| (dpf & DP_FLUSH ? REQ_PREFLUSH : 0); |
| } |
| |
| static enum req_op wire_flags_to_bio_op(u32 dpf) |
| { |
| if (dpf & DP_ZEROES) |
| return REQ_OP_WRITE_ZEROES; |
| if (dpf & DP_DISCARD) |
| return REQ_OP_DISCARD; |
| else |
| return REQ_OP_WRITE; |
| } |
| |
| static void fail_postponed_requests(struct drbd_device *device, sector_t sector, |
| unsigned int size) |
| { |
| struct drbd_interval *i; |
| |
| repeat: |
| drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
| struct drbd_request *req; |
| struct bio_and_error m; |
| |
| if (!i->local) |
| continue; |
| req = container_of(i, struct drbd_request, i); |
| if (!(req->rq_state & RQ_POSTPONED)) |
| continue; |
| req->rq_state &= ~RQ_POSTPONED; |
| __req_mod(req, NEG_ACKED, &m); |
| spin_unlock_irq(&device->resource->req_lock); |
| if (m.bio) |
| complete_master_bio(device, &m); |
| spin_lock_irq(&device->resource->req_lock); |
| goto repeat; |
| } |
| } |
| |
| static int handle_write_conflicts(struct drbd_device *device, |
| struct drbd_peer_request *peer_req) |
| { |
| struct drbd_connection *connection = peer_req->peer_device->connection; |
| bool resolve_conflicts = test_bit(RESOLVE_CONFLICTS, &connection->flags); |
| sector_t sector = peer_req->i.sector; |
| const unsigned int size = peer_req->i.size; |
| struct drbd_interval *i; |
| bool equal; |
| int err; |
| |
| /* |
| * Inserting the peer request into the write_requests tree will prevent |
| * new conflicting local requests from being added. |
| */ |
| drbd_insert_interval(&device->write_requests, &peer_req->i); |
| |
| repeat: |
| drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
| if (i == &peer_req->i) |
| continue; |
| if (i->completed) |
| continue; |
| |
| if (!i->local) { |
| /* |
| * Our peer has sent a conflicting remote request; this |
| * should not happen in a two-node setup. Wait for the |
| * earlier peer request to complete. |
| */ |
| err = drbd_wait_misc(device, i); |
| if (err) |
| goto out; |
| goto repeat; |
| } |
| |
| equal = i->sector == sector && i->size == size; |
| if (resolve_conflicts) { |
| /* |
| * If the peer request is fully contained within the |
| * overlapping request, it can be considered overwritten |
| * and thus superseded; otherwise, it will be retried |
| * once all overlapping requests have completed. |
| */ |
| bool superseded = i->sector <= sector && i->sector + |
| (i->size >> 9) >= sector + (size >> 9); |
| |
| if (!equal) |
| drbd_alert(device, "Concurrent writes detected: " |
| "local=%llus +%u, remote=%llus +%u, " |
| "assuming %s came first\n", |
| (unsigned long long)i->sector, i->size, |
| (unsigned long long)sector, size, |
| superseded ? "local" : "remote"); |
| |
| peer_req->w.cb = superseded ? e_send_superseded : |
| e_send_retry_write; |
| list_add_tail(&peer_req->w.list, &device->done_ee); |
| queue_work(connection->ack_sender, &peer_req->peer_device->send_acks_work); |
| |
| err = -ENOENT; |
| goto out; |
| } else { |
| struct drbd_request *req = |
| container_of(i, struct drbd_request, i); |
| |
| if (!equal) |
| drbd_alert(device, "Concurrent writes detected: " |
| "local=%llus +%u, remote=%llus +%u\n", |
| (unsigned long long)i->sector, i->size, |
| (unsigned long long)sector, size); |
| |
| if (req->rq_state & RQ_LOCAL_PENDING || |
| !(req->rq_state & RQ_POSTPONED)) { |
| /* |
| * Wait for the node with the discard flag to |
| * decide if this request has been superseded |
| * or needs to be retried. |
| * Requests that have been superseded will |
| * disappear from the write_requests tree. |
| * |
| * In addition, wait for the conflicting |
| * request to finish locally before submitting |
| * the conflicting peer request. |
| */ |
| err = drbd_wait_misc(device, &req->i); |
| if (err) { |
| _conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD); |
| fail_postponed_requests(device, sector, size); |
| goto out; |
| } |
| goto repeat; |
| } |
| /* |
| * Remember to restart the conflicting requests after |
| * the new peer request has completed. |
| */ |
| peer_req->flags |= EE_RESTART_REQUESTS; |
| } |
| } |
| err = 0; |
| |
| out: |
| if (err) |
| drbd_remove_epoch_entry_interval(device, peer_req); |
| return err; |
| } |
| |
| /* mirrored write */ |
| static int receive_Data(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct net_conf *nc; |
| sector_t sector; |
| struct drbd_peer_request *peer_req; |
| struct p_data *p = pi->data; |
| u32 peer_seq = be32_to_cpu(p->seq_num); |
| enum req_op op; |
| blk_opf_t op_flags; |
| u32 dp_flags; |
| int err, tp; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| if (!get_ldev(device)) { |
| int err2; |
| |
| err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
| drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); |
| atomic_inc(&connection->current_epoch->epoch_size); |
| err2 = drbd_drain_block(peer_device, pi->size); |
| if (!err) |
| err = err2; |
| return err; |
| } |
| |
| /* |
| * Corresponding put_ldev done either below (on various errors), or in |
| * drbd_peer_request_endio, if we successfully submit the data at the |
| * end of this function. |
| */ |
| |
| sector = be64_to_cpu(p->sector); |
| peer_req = read_in_block(peer_device, p->block_id, sector, pi); |
| if (!peer_req) { |
| put_ldev(device); |
| return -EIO; |
| } |
| |
| peer_req->w.cb = e_end_block; |
| peer_req->submit_jif = jiffies; |
| peer_req->flags |= EE_APPLICATION; |
| |
| dp_flags = be32_to_cpu(p->dp_flags); |
| op = wire_flags_to_bio_op(dp_flags); |
| op_flags = wire_flags_to_bio_flags(dp_flags); |
| if (pi->cmd == P_TRIM) { |
| D_ASSERT(peer_device, peer_req->i.size > 0); |
| D_ASSERT(peer_device, op == REQ_OP_DISCARD); |
| D_ASSERT(peer_device, peer_req->pages == NULL); |
| /* need to play safe: an older DRBD sender |
| * may mean zero-out while sending P_TRIM. */ |
| if (0 == (connection->agreed_features & DRBD_FF_WZEROES)) |
| peer_req->flags |= EE_ZEROOUT; |
| } else if (pi->cmd == P_ZEROES) { |
| D_ASSERT(peer_device, peer_req->i.size > 0); |
| D_ASSERT(peer_device, op == REQ_OP_WRITE_ZEROES); |
| D_ASSERT(peer_device, peer_req->pages == NULL); |
| /* Do (not) pass down BLKDEV_ZERO_NOUNMAP? */ |
| if (dp_flags & DP_DISCARD) |
| peer_req->flags |= EE_TRIM; |
| } else if (peer_req->pages == NULL) { |
| D_ASSERT(device, peer_req->i.size == 0); |
| D_ASSERT(device, dp_flags & DP_FLUSH); |
| } |
| |
| if (dp_flags & DP_MAY_SET_IN_SYNC) |
| peer_req->flags |= EE_MAY_SET_IN_SYNC; |
| |
| spin_lock(&connection->epoch_lock); |
| peer_req->epoch = connection->current_epoch; |
| atomic_inc(&peer_req->epoch->epoch_size); |
| atomic_inc(&peer_req->epoch->active); |
| spin_unlock(&connection->epoch_lock); |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(peer_device->connection->net_conf); |
| tp = nc->two_primaries; |
| if (peer_device->connection->agreed_pro_version < 100) { |
| switch (nc->wire_protocol) { |
| case DRBD_PROT_C: |
| dp_flags |= DP_SEND_WRITE_ACK; |
| break; |
| case DRBD_PROT_B: |
| dp_flags |= DP_SEND_RECEIVE_ACK; |
| break; |
| } |
| } |
| rcu_read_unlock(); |
| |
| if (dp_flags & DP_SEND_WRITE_ACK) { |
| peer_req->flags |= EE_SEND_WRITE_ACK; |
| inc_unacked(device); |
| /* corresponding dec_unacked() in e_end_block() |
| * respective _drbd_clear_done_ee */ |
| } |
| |
| if (dp_flags & DP_SEND_RECEIVE_ACK) { |
| /* I really don't like it that the receiver thread |
| * sends on the msock, but anyways */ |
| drbd_send_ack(peer_device, P_RECV_ACK, peer_req); |
| } |
| |
| if (tp) { |
| /* two primaries implies protocol C */ |
| D_ASSERT(device, dp_flags & DP_SEND_WRITE_ACK); |
| peer_req->flags |= EE_IN_INTERVAL_TREE; |
| err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
| if (err) |
| goto out_interrupted; |
| spin_lock_irq(&device->resource->req_lock); |
| err = handle_write_conflicts(device, peer_req); |
| if (err) { |
| spin_unlock_irq(&device->resource->req_lock); |
| if (err == -ENOENT) { |
| put_ldev(device); |
| return 0; |
| } |
| goto out_interrupted; |
| } |
| } else { |
| update_peer_seq(peer_device, peer_seq); |
| spin_lock_irq(&device->resource->req_lock); |
| } |
| /* TRIM and is processed synchronously, |
| * we wait for all pending requests, respectively wait for |
| * active_ee to become empty in drbd_submit_peer_request(); |
| * better not add ourselves here. */ |
| if ((peer_req->flags & (EE_TRIM | EE_ZEROOUT)) == 0) |
| list_add_tail(&peer_req->w.list, &device->active_ee); |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| if (device->state.conn == C_SYNC_TARGET) |
| wait_event(device->ee_wait, !overlapping_resync_write(device, peer_req)); |
| |
| if (device->state.pdsk < D_INCONSISTENT) { |
| /* In case we have the only disk of the cluster, */ |
| drbd_set_out_of_sync(device, peer_req->i.sector, peer_req->i.size); |
| peer_req->flags &= ~EE_MAY_SET_IN_SYNC; |
| drbd_al_begin_io(device, &peer_req->i); |
| peer_req->flags |= EE_CALL_AL_COMPLETE_IO; |
| } |
| |
| err = drbd_submit_peer_request(device, peer_req, op | op_flags, |
| DRBD_FAULT_DT_WR); |
| if (!err) |
| return 0; |
| |
| /* don't care for the reason here */ |
| drbd_err(device, "submit failed, triggering re-connect\n"); |
| spin_lock_irq(&device->resource->req_lock); |
| list_del(&peer_req->w.list); |
| drbd_remove_epoch_entry_interval(device, peer_req); |
| spin_unlock_irq(&device->resource->req_lock); |
| if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) { |
| peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; |
| drbd_al_complete_io(device, &peer_req->i); |
| } |
| |
| out_interrupted: |
| drbd_may_finish_epoch(connection, peer_req->epoch, EV_PUT | EV_CLEANUP); |
| put_ldev(device); |
| drbd_free_peer_req(device, peer_req); |
| return err; |
| } |
| |
| /* We may throttle resync, if the lower device seems to be busy, |
| * and current sync rate is above c_min_rate. |
| * |
| * To decide whether or not the lower device is busy, we use a scheme similar |
| * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" |
| * (more than 64 sectors) of activity we cannot account for with our own resync |
| * activity, it obviously is "busy". |
| * |
| * The current sync rate used here uses only the most recent two step marks, |
| * to have a short time average so we can react faster. |
| */ |
| bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector, |
| bool throttle_if_app_is_waiting) |
| { |
| struct lc_element *tmp; |
| bool throttle = drbd_rs_c_min_rate_throttle(device); |
| |
| if (!throttle || throttle_if_app_is_waiting) |
| return throttle; |
| |
| spin_lock_irq(&device->al_lock); |
| tmp = lc_find(device->resync, BM_SECT_TO_EXT(sector)); |
| if (tmp) { |
| struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); |
| if (test_bit(BME_PRIORITY, &bm_ext->flags)) |
| throttle = false; |
| /* Do not slow down if app IO is already waiting for this extent, |
| * and our progress is necessary for application IO to complete. */ |
| } |
| spin_unlock_irq(&device->al_lock); |
| |
| return throttle; |
| } |
| |
| bool drbd_rs_c_min_rate_throttle(struct drbd_device *device) |
| { |
| struct gendisk *disk = device->ldev->backing_bdev->bd_disk; |
| unsigned long db, dt, dbdt; |
| unsigned int c_min_rate; |
| int curr_events; |
| |
| rcu_read_lock(); |
| c_min_rate = rcu_dereference(device->ldev->disk_conf)->c_min_rate; |
| rcu_read_unlock(); |
| |
| /* feature disabled? */ |
| if (c_min_rate == 0) |
| return false; |
| |
| curr_events = (int)part_stat_read_accum(disk->part0, sectors) - |
| atomic_read(&device->rs_sect_ev); |
| |
| if (atomic_read(&device->ap_actlog_cnt) |
| || curr_events - device->rs_last_events > 64) { |
| unsigned long rs_left; |
| int i; |
| |
| device->rs_last_events = curr_events; |
| |
| /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, |
| * approx. */ |
| i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; |
| |
| if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) |
| rs_left = device->ov_left; |
| else |
| rs_left = drbd_bm_total_weight(device) - device->rs_failed; |
| |
| dt = ((long)jiffies - (long)device->rs_mark_time[i]) / HZ; |
| if (!dt) |
| dt++; |
| db = device->rs_mark_left[i] - rs_left; |
| dbdt = Bit2KB(db/dt); |
| |
| if (dbdt > c_min_rate) |
| return true; |
| } |
| return false; |
| } |
| |
| static int receive_DataRequest(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| sector_t sector; |
| sector_t capacity; |
| struct drbd_peer_request *peer_req; |
| struct digest_info *di = NULL; |
| int size, verb; |
| unsigned int fault_type; |
| struct p_block_req *p = pi->data; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| capacity = get_capacity(device->vdisk); |
| |
| sector = be64_to_cpu(p->sector); |
| size = be32_to_cpu(p->blksize); |
| |
| if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
| drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
| (unsigned long long)sector, size); |
| return -EINVAL; |
| } |
| if (sector + (size>>9) > capacity) { |
| drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
| (unsigned long long)sector, size); |
| return -EINVAL; |
| } |
| |
| if (!get_ldev_if_state(device, D_UP_TO_DATE)) { |
| verb = 1; |
| switch (pi->cmd) { |
| case P_DATA_REQUEST: |
| drbd_send_ack_rp(peer_device, P_NEG_DREPLY, p); |
| break; |
| case P_RS_THIN_REQ: |
| case P_RS_DATA_REQUEST: |
| case P_CSUM_RS_REQUEST: |
| case P_OV_REQUEST: |
| drbd_send_ack_rp(peer_device, P_NEG_RS_DREPLY , p); |
| break; |
| case P_OV_REPLY: |
| verb = 0; |
| dec_rs_pending(device); |
| drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, size, ID_IN_SYNC); |
| break; |
| default: |
| BUG(); |
| } |
| if (verb && __ratelimit(&drbd_ratelimit_state)) |
| drbd_err(device, "Can not satisfy peer's read request, " |
| "no local data.\n"); |
| |
| /* drain possibly payload */ |
| return drbd_drain_block(peer_device, pi->size); |
| } |
| |
| /* 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. */ |
| peer_req = drbd_alloc_peer_req(peer_device, p->block_id, sector, size, |
| size, GFP_NOIO); |
| if (!peer_req) { |
| put_ldev(device); |
| return -ENOMEM; |
| } |
| |
| switch (pi->cmd) { |
| case P_DATA_REQUEST: |
| peer_req->w.cb = w_e_end_data_req; |
| fault_type = DRBD_FAULT_DT_RD; |
| /* application IO, don't drbd_rs_begin_io */ |
| peer_req->flags |= EE_APPLICATION; |
| goto submit; |
| |
| case P_RS_THIN_REQ: |
| /* If at some point in the future we have a smart way to |
| find out if this data block is completely deallocated, |
| then we would do something smarter here than reading |
| the block... */ |
| peer_req->flags |= EE_RS_THIN_REQ; |
| fallthrough; |
| case P_RS_DATA_REQUEST: |
| peer_req->w.cb = w_e_end_rsdata_req; |
| fault_type = DRBD_FAULT_RS_RD; |
| /* used in the sector offset progress display */ |
| device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
| break; |
| |
| case P_OV_REPLY: |
| case P_CSUM_RS_REQUEST: |
| fault_type = DRBD_FAULT_RS_RD; |
| di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); |
| if (!di) |
| goto out_free_e; |
| |
| di->digest_size = pi->size; |
| di->digest = (((char *)di)+sizeof(struct digest_info)); |
| |
| peer_req->digest = di; |
| peer_req->flags |= EE_HAS_DIGEST; |
| |
| if (drbd_recv_all(peer_device->connection, di->digest, pi->size)) |
| goto out_free_e; |
| |
| if (pi->cmd == P_CSUM_RS_REQUEST) { |
| D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
| peer_req->w.cb = w_e_end_csum_rs_req; |
| /* used in the sector offset progress display */ |
| device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
| /* remember to report stats in drbd_resync_finished */ |
| device->use_csums = true; |
| } else if (pi->cmd == P_OV_REPLY) { |
| /* track progress, we may need to throttle */ |
| atomic_add(size >> 9, &device->rs_sect_in); |
| peer_req->w.cb = w_e_end_ov_reply; |
| dec_rs_pending(device); |
| /* drbd_rs_begin_io done when we sent this request, |
| * but accounting still needs to be done. */ |
| goto submit_for_resync; |
| } |
| break; |
| |
| case P_OV_REQUEST: |
| if (device->ov_start_sector == ~(sector_t)0 && |
| peer_device->connection->agreed_pro_version >= 90) { |
| unsigned long now = jiffies; |
| int i; |
| device->ov_start_sector = sector; |
| device->ov_position = sector; |
| device->ov_left = drbd_bm_bits(device) - BM_SECT_TO_BIT(sector); |
| device->rs_total = device->ov_left; |
| for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
| device->rs_mark_left[i] = device->ov_left; |
| device->rs_mark_time[i] = now; |
| } |
| drbd_info(device, "Online Verify start sector: %llu\n", |
| (unsigned long long)sector); |
| } |
| peer_req->w.cb = w_e_end_ov_req; |
| fault_type = DRBD_FAULT_RS_RD; |
| break; |
| |
| default: |
| BUG(); |
| } |
| |
| /* Throttle, drbd_rs_begin_io and submit should become asynchronous |
| * wrt the receiver, but it is not as straightforward as it may seem. |
| * Various places in the resync start and stop logic assume resync |
| * requests are processed in order, requeuing this on the worker thread |
| * introduces a bunch of new code for synchronization between threads. |
| * |
| * Unlimited throttling before drbd_rs_begin_io may stall the resync |
| * "forever", throttling after drbd_rs_begin_io will lock that extent |
| * for application writes for the same time. For now, just throttle |
| * here, where the rest of the code expects the receiver to sleep for |
| * a while, anyways. |
| */ |
| |
| /* Throttle before drbd_rs_begin_io, as that locks out application IO; |
| * this defers syncer requests for some time, before letting at least |
| * on request through. The resync controller on the receiving side |
| * will adapt to the incoming rate accordingly. |
| * |
| * We cannot throttle here if remote is Primary/SyncTarget: |
| * we would also throttle its application reads. |
| * In that case, throttling is done on the SyncTarget only. |
| */ |
| |
| /* Even though this may be a resync request, we do add to "read_ee"; |
| * "sync_ee" is only used for resync WRITEs. |
| * Add to list early, so debugfs can find this request |
| * even if we have to sleep below. */ |
| spin_lock_irq(&device->resource->req_lock); |
| list_add_tail(&peer_req->w.list, &device->read_ee); |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| update_receiver_timing_details(connection, drbd_rs_should_slow_down); |
| if (device->state.peer != R_PRIMARY |
| && drbd_rs_should_slow_down(device, sector, false)) |
| schedule_timeout_uninterruptible(HZ/10); |
| update_receiver_timing_details(connection, drbd_rs_begin_io); |
| if (drbd_rs_begin_io(device, sector)) |
| goto out_free_e; |
| |
| submit_for_resync: |
| atomic_add(size >> 9, &device->rs_sect_ev); |
| |
| submit: |
| update_receiver_timing_details(connection, drbd_submit_peer_request); |
| inc_unacked(device); |
| if (drbd_submit_peer_request(device, peer_req, REQ_OP_READ, |
| fault_type) == 0) |
| return 0; |
| |
| /* don't care for the reason here */ |
| drbd_err(device, "submit failed, triggering re-connect\n"); |
| |
| out_free_e: |
| spin_lock_irq(&device->resource->req_lock); |
| list_del(&peer_req->w.list); |
| spin_unlock_irq(&device->resource->req_lock); |
| /* no drbd_rs_complete_io(), we are dropping the connection anyways */ |
| |
| put_ldev(device); |
| drbd_free_peer_req(device, peer_req); |
| return -EIO; |
| } |
| |
| /* |
| * drbd_asb_recover_0p - Recover after split-brain with no remaining primaries |
| */ |
| static int drbd_asb_recover_0p(struct drbd_peer_device *peer_device) __must_hold(local) |
| { |
| struct drbd_device *device = peer_device->device; |
| int self, peer, rv = -100; |
| unsigned long ch_self, ch_peer; |
| enum drbd_after_sb_p after_sb_0p; |
| |
| self = device->ldev->md.uuid[UI_BITMAP] & 1; |
| peer = device->p_uuid[UI_BITMAP] & 1; |
| |
| ch_peer = device->p_uuid[UI_SIZE]; |
| ch_self = device->comm_bm_set; |
| |
| rcu_read_lock(); |
| after_sb_0p = rcu_dereference(peer_device->connection->net_conf)->after_sb_0p; |
| rcu_read_unlock(); |
| switch (after_sb_0p) { |
| case ASB_CONSENSUS: |
| case ASB_DISCARD_SECONDARY: |
| case ASB_CALL_HELPER: |
| case ASB_VIOLENTLY: |
| drbd_err(device, "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; |
| } |
| fallthrough; /* 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... */ |
| drbd_warn(device, "Discard younger/older primary did not find a decision\n" |
| "Using discard-least-changes instead\n"); |
| fallthrough; |
| case ASB_DISCARD_ZERO_CHG: |
| if (ch_peer == 0 && ch_self == 0) { |
| rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
| ? -1 : 1; |
| break; |
| } else { |
| if (ch_peer == 0) { rv = 1; break; } |
| if (ch_self == 0) { rv = -1; break; } |
| } |
| if (after_sb_0p == ASB_DISCARD_ZERO_CHG) |
| break; |
| fallthrough; |
| 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(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
| ? -1 : 1; |
| break; |
| case ASB_DISCARD_LOCAL: |
| rv = -1; |
| break; |
| case ASB_DISCARD_REMOTE: |
| rv = 1; |
| } |
| |
| return rv; |
| } |
| |
| /* |
| * drbd_asb_recover_1p - Recover after split-brain with one remaining primary |
| */ |
| static int drbd_asb_recover_1p(struct drbd_peer_device *peer_device) __must_hold(local) |
| { |
| struct drbd_device *device = peer_device->device; |
| int hg, rv = -100; |
| enum drbd_after_sb_p after_sb_1p; |
| |
| rcu_read_lock(); |
| after_sb_1p = rcu_dereference(peer_device->connection->net_conf)->after_sb_1p; |
| rcu_read_unlock(); |
| switch (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: |
| case ASB_DISCARD_ZERO_CHG: |
| drbd_err(device, "Configuration error.\n"); |
| break; |
| case ASB_DISCONNECT: |
| break; |
| case ASB_CONSENSUS: |
| hg = drbd_asb_recover_0p(peer_device); |
| if (hg == -1 && device->state.role == R_SECONDARY) |
| rv = hg; |
| if (hg == 1 && device->state.role == R_PRIMARY) |
| rv = hg; |
| break; |
| case ASB_VIOLENTLY: |
| rv = drbd_asb_recover_0p(peer_device); |
| break; |
| case ASB_DISCARD_SECONDARY: |
| return device->state.role == R_PRIMARY ? 1 : -1; |
| case ASB_CALL_HELPER: |
| hg = drbd_asb_recover_0p(peer_device); |
| if (hg == -1 && device->state.role == R_PRIMARY) { |
| enum drbd_state_rv rv2; |
| |
| /* 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. */ |
| rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); |
| if (rv2 != SS_SUCCESS) { |
| drbd_khelper(device, "pri-lost-after-sb"); |
| } else { |
| drbd_warn(device, "Successfully gave up primary role.\n"); |
| rv = hg; |
| } |
| } else |
| rv = hg; |
| } |
| |
| return rv; |
| } |
| |
| /* |
| * drbd_asb_recover_2p - Recover after split-brain with two remaining primaries |
| */ |
| static int drbd_asb_recover_2p(struct drbd_peer_device *peer_device) __must_hold(local) |
| { |
| struct drbd_device *device = peer_device->device; |
| int hg, rv = -100; |
| enum drbd_after_sb_p after_sb_2p; |
| |
| rcu_read_lock(); |
| after_sb_2p = rcu_dereference(peer_device->connection->net_conf)->after_sb_2p; |
| rcu_read_unlock(); |
| switch (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: |
| case ASB_DISCARD_ZERO_CHG: |
| drbd_err(device, "Configuration error.\n"); |
| break; |
| case ASB_VIOLENTLY: |
| rv = drbd_asb_recover_0p(peer_device); |
| break; |
| case ASB_DISCONNECT: |
| break; |
| case ASB_CALL_HELPER: |
| hg = drbd_asb_recover_0p(peer_device); |
| if (hg == -1) { |
| enum drbd_state_rv rv2; |
| |
| /* 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. */ |
| rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); |
| if (rv2 != SS_SUCCESS) { |
| drbd_khelper(device, "pri-lost-after-sb"); |
| } else { |
| drbd_warn(device, "Successfully gave up primary role.\n"); |
| rv = hg; |
| } |
| } else |
| rv = hg; |
| } |
| |
| return rv; |
| } |
| |
| static void drbd_uuid_dump(struct drbd_device *device, char *text, u64 *uuid, |
| u64 bits, u64 flags) |
| { |
| if (!uuid) { |
| drbd_info(device, "%s uuid info vanished while I was looking!\n", text); |
| return; |
| } |
| drbd_info(device, "%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 |
| -1091 requires proto 91 |
| -1096 requires proto 96 |
| */ |
| |
| static int drbd_uuid_compare(struct drbd_device *const device, enum drbd_role const peer_role, int *rule_nr) __must_hold(local) |
| { |
| struct drbd_peer_device *const peer_device = first_peer_device(device); |
| struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL; |
| u64 self, peer; |
| int i, j; |
| |
| self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
| peer = device->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 (device->p_uuid[UI_BITMAP] == (u64)0 && device->ldev->md.uuid[UI_BITMAP] != (u64)0) { |
| |
| if (connection->agreed_pro_version < 91) |
| return -1091; |
| |
| if ((device->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) && |
| (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { |
| drbd_info(device, "was SyncSource, missed the resync finished event, corrected myself:\n"); |
| drbd_uuid_move_history(device); |
| device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP]; |
| device->ldev->md.uuid[UI_BITMAP] = 0; |
| |
| drbd_uuid_dump(device, "self", device->ldev->md.uuid, |
| device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); |
| *rule_nr = 34; |
| } else { |
| drbd_info(device, "was SyncSource (peer failed to write sync_uuid)\n"); |
| *rule_nr = 36; |
| } |
| |
| return 1; |
| } |
| |
| if (device->ldev->md.uuid[UI_BITMAP] == (u64)0 && device->p_uuid[UI_BITMAP] != (u64)0) { |
| |
| if (connection->agreed_pro_version < 91) |
| return -1091; |
| |
| if ((device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_BITMAP] & ~((u64)1)) && |
| (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1))) { |
| drbd_info(device, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); |
| |
| device->p_uuid[UI_HISTORY_START + 1] = device->p_uuid[UI_HISTORY_START]; |
| device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_BITMAP]; |
| device->p_uuid[UI_BITMAP] = 0UL; |
| |
| drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
| *rule_nr = 35; |
| } else { |
| drbd_info(device, "was SyncTarget (failed to write sync_uuid)\n"); |
| *rule_nr = 37; |
| } |
| |
| return -1; |
| } |
| |
| /* Common power [off|failure] */ |
| rct = (test_bit(CRASHED_PRIMARY, &device->flags) ? 1 : 0) + |
| (device->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; |
| |
| /* Neither has the "crashed primary" flag set, |
| * only a replication link hickup. */ |
| if (rct == 0) |
| return 0; |
| |
| /* Current UUID equal and no bitmap uuid; does not necessarily |
| * mean this was a "simultaneous hard crash", maybe IO was |
| * frozen, so no UUID-bump happened. |
| * This is a protocol change, overload DRBD_FF_WSAME as flag |
| * for "new-enough" peer DRBD version. */ |
| if (device->state.role == R_PRIMARY || peer_role == R_PRIMARY) { |
| *rule_nr = 41; |
| if (!(connection->agreed_features & DRBD_FF_WSAME)) { |
| drbd_warn(peer_device, "Equivalent unrotated UUIDs, but current primary present.\n"); |
| return -(0x10000 | PRO_VERSION_MAX | (DRBD_FF_WSAME << 8)); |
| } |
| if (device->state.role == R_PRIMARY && peer_role == R_PRIMARY) { |
| /* At least one has the "crashed primary" bit set, |
| * both are primary now, but neither has rotated its UUIDs? |
| * "Can not happen." */ |
| drbd_err(peer_device, "Equivalent unrotated UUIDs, but both are primary. Can not resolve this.\n"); |
| return -100; |
| } |
| if (device->state.role == R_PRIMARY) |
| return 1; |
| return -1; |
| } |
| |
| /* Both are secondary. |
| * Really looks like recovery from simultaneous hard crash. |
| * Check which had been primary before, and arbitrate. */ |
| switch (rct) { |
| case 0: /* !self_pri && !peer_pri */ return 0; /* already handled */ |
| 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(RESOLVE_CONFLICTS, &connection->flags); |
| return dc ? -1 : 1; |
| } |
| } |
| |
| *rule_nr = 50; |
| peer = device->p_uuid[UI_BITMAP] & ~((u64)1); |
| if (self == peer) |
| return -1; |
| |
| *rule_nr = 51; |
| peer = device->p_uuid[UI_HISTORY_START] & ~((u64)1); |
| if (self == peer) { |
| if (connection->agreed_pro_version < 96 ? |
| (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == |
| (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : |
| peer + UUID_NEW_BM_OFFSET == (device->p_uuid[UI_BITMAP] & ~((u64)1))) { |
| /* 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 (connection->agreed_pro_version < 91) |
| return -1091; |
| |
| device->p_uuid[UI_BITMAP] = device->p_uuid[UI_HISTORY_START]; |
| device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_HISTORY_START + 1]; |
| |
| drbd_info(device, "Lost last syncUUID packet, corrected:\n"); |
| drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
| |
| return -1; |
| } |
| } |
| |
| *rule_nr = 60; |
| self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
| for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
| peer = device->p_uuid[i] & ~((u64)1); |
| if (self == peer) |
| return -2; |
| } |
| |
| *rule_nr = 70; |
| self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
| peer = device->p_uuid[UI_CURRENT] & ~((u64)1); |
| if (self == peer) |
| return 1; |
| |
| *rule_nr = 71; |
| self = device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); |
| if (self == peer) { |
| if (connection->agreed_pro_version < 96 ? |
| (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == |
| (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) : |
| self + UUID_NEW_BM_OFFSET == (device->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { |
| /* The last P_SYNC_UUID did not get though. Undo the last start of |
| resync as sync source modifications of our UUIDs. */ |
| |
| if (connection->agreed_pro_version < 91) |
| return -1091; |
| |
| __drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_HISTORY_START]); |
| __drbd_uuid_set(device, UI_HISTORY_START, device->ldev->md.uuid[UI_HISTORY_START + 1]); |
| |
| drbd_info(device, "Last syncUUID did not get through, corrected:\n"); |
| drbd_uuid_dump(device, "self", device->ldev->md.uuid, |
| device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); |
| |
| return 1; |
| } |
| } |
| |
| |
| *rule_nr = 80; |
| peer = device->p_uuid[UI_CURRENT] & ~((u64)1); |
| for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
| self = device->ldev->md.uuid[i] & ~((u64)1); |
| if (self == peer) |
| return 2; |
| } |
| |
| *rule_nr = 90; |
| self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
| peer = device->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 = device->ldev->md.uuid[i] & ~((u64)1); |
| for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { |
| peer = device->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_peer_device *peer_device, |
| enum drbd_role peer_role, |
| enum drbd_disk_state peer_disk) __must_hold(local) |
| { |
| struct drbd_device *device = peer_device->device; |
| enum drbd_conns rv = C_MASK; |
| enum drbd_disk_state mydisk; |
| struct net_conf *nc; |
| int hg, rule_nr, rr_conflict, tentative, always_asbp; |
| |
| mydisk = device->state.disk; |
| if (mydisk == D_NEGOTIATING) |
| mydisk = device->new_state_tmp.disk; |
| |
| drbd_info(device, "drbd_sync_handshake:\n"); |
| |
| spin_lock_irq(&device->ldev->md.uuid_lock); |
| drbd_uuid_dump(device, "self", device->ldev->md.uuid, device->comm_bm_set, 0); |
| drbd_uuid_dump(device, "peer", device->p_uuid, |
| device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
| |
| hg = drbd_uuid_compare(device, peer_role, &rule_nr); |
| spin_unlock_irq(&device->ldev->md.uuid_lock); |
| |
| drbd_info(device, "uuid_compare()=%d by rule %d\n", hg, rule_nr); |
| |
| if (hg == -1000) { |
| drbd_alert(device, "Unrelated data, aborting!\n"); |
| return C_MASK; |
| } |
| if (hg < -0x10000) { |
| int proto, fflags; |
| hg = -hg; |
| proto = hg & 0xff; |
| fflags = (hg >> 8) & 0xff; |
| drbd_alert(device, "To resolve this both sides have to support at least protocol %d and feature flags 0x%x\n", |
| proto, fflags); |
| return C_MASK; |
| } |
| if (hg < -1000) { |
| drbd_alert(device, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); |
| 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; |
| drbd_info(device, "Becoming sync %s due to disk states.\n", |
| hg > 0 ? "source" : "target"); |
| } |
| |
| if (abs(hg) == 100) |
| drbd_khelper(device, "initial-split-brain"); |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(peer_device->connection->net_conf); |
| always_asbp = nc->always_asbp; |
| rr_conflict = nc->rr_conflict; |
| tentative = nc->tentative; |
| rcu_read_unlock(); |
| |
| if (hg == 100 || (hg == -100 && always_asbp)) { |
| int pcount = (device->state.role == R_PRIMARY) |
| + (peer_role == R_PRIMARY); |
| int forced = (hg == -100); |
| |
| switch (pcount) { |
| case 0: |
| hg = drbd_asb_recover_0p(peer_device); |
| break; |
| case 1: |
| hg = drbd_asb_recover_1p(peer_device); |
| break; |
| case 2: |
| hg = drbd_asb_recover_2p(peer_device); |
| break; |
| } |
| if (abs(hg) < 100) { |
| drbd_warn(device, "Split-Brain detected, %d primaries, " |
| "automatically solved. Sync from %s node\n", |
| pcount, (hg < 0) ? "peer" : "this"); |
| if (forced) { |
| drbd_warn(device, "Doing a full sync, since" |
| " UUIDs where ambiguous.\n"); |
| hg = hg*2; |
| } |
| } |
| } |
| |
| if (hg == -100) { |
| if (test_bit(DISCARD_MY_DATA, &device->flags) && !(device->p_uuid[UI_FLAGS]&1)) |
| hg = -1; |
| if (!test_bit(DISCARD_MY_DATA, &device->flags) && (device->p_uuid[UI_FLAGS]&1)) |
| hg = 1; |
| |
| if (abs(hg) < 100) |
| drbd_warn(device, "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... */ |
| drbd_alert(device, "Split-Brain detected but unresolved, dropping connection!\n"); |
| drbd_khelper(device, "split-brain"); |
| return C_MASK; |
| } |
| |
| if (hg > 0 && mydisk <= D_INCONSISTENT) { |
| drbd_err(device, "I shall become SyncSource, but I am inconsistent!\n"); |
| return C_MASK; |
| } |
| |
| if (hg < 0 && /* by intention we do not use mydisk here. */ |
| device->state.role == R_PRIMARY && device->state.disk >= D_CONSISTENT) { |
| switch (rr_conflict) { |
| case ASB_CALL_HELPER: |
| drbd_khelper(device, "pri-lost"); |
| fallthrough; |
| case ASB_DISCONNECT: |
| drbd_err(device, "I shall become SyncTarget, but I am primary!\n"); |
| return C_MASK; |
| case ASB_VIOLENTLY: |
| drbd_warn(device, "Becoming SyncTarget, violating the stable-data" |
| "assumption\n"); |
| } |
| } |
| |
| if (tentative || test_bit(CONN_DRY_RUN, &peer_device->connection->flags)) { |
| if (hg == 0) |
| drbd_info(device, "dry-run connect: No resync, would become Connected immediately.\n"); |
| else |
| drbd_info(device, "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) { |
| drbd_info(device, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); |
| if (drbd_bitmap_io(device, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", |
| BM_LOCKED_SET_ALLOWED)) |
| 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(device)) { |
| drbd_info(device, "No resync, but %lu bits in bitmap!\n", |
| drbd_bm_total_weight(device)); |
| } |
| } |
| |
| return rv; |
| } |
| |
| static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) |
| { |
| /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ |
| if (peer == ASB_DISCARD_REMOTE) |
| return ASB_DISCARD_LOCAL; |
| |
| /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ |
| if (peer == ASB_DISCARD_LOCAL) |
| return ASB_DISCARD_REMOTE; |
| |
| /* everything else is valid if they are equal on both sides. */ |
| return peer; |
| } |
| |
| static int receive_protocol(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct p_protocol *p = pi->data; |
| enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
| int p_proto, p_discard_my_data, p_two_primaries, cf; |
| struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; |
| char integrity_alg[SHARED_SECRET_MAX] = ""; |
| struct crypto_shash *peer_integrity_tfm = NULL; |
| void *int_dig_in = NULL, *int_dig_vv = NULL; |
| |
| 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_discard_my_data = cf & CF_DISCARD_MY_DATA; |
| |
| if (connection->agreed_pro_version >= 87) { |
| int err; |
| |
| if (pi->size > sizeof(integrity_alg)) |
| return -EIO; |
| err = drbd_recv_all(connection, integrity_alg, pi->size); |
| if (err) |
| return err; |
| integrity_alg[SHARED_SECRET_MAX - 1] = 0; |
| } |
| |
| if (pi->cmd != P_PROTOCOL_UPDATE) { |
| clear_bit(CONN_DRY_RUN, &connection->flags); |
| |
| if (cf & CF_DRY_RUN) |
| set_bit(CONN_DRY_RUN, &connection->flags); |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(connection->net_conf); |
| |
| if (p_proto != nc->wire_protocol) { |
| drbd_err(connection, "incompatible %s settings\n", "protocol"); |
| goto disconnect_rcu_unlock; |
| } |
| |
| if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { |
| drbd_err(connection, "incompatible %s settings\n", "after-sb-0pri"); |
| goto disconnect_rcu_unlock; |
| } |
| |
| if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { |
| drbd_err(connection, "incompatible %s settings\n", "after-sb-1pri"); |
| goto disconnect_rcu_unlock; |
| } |
| |
| if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { |
| drbd_err(connection, "incompatible %s settings\n", "after-sb-2pri"); |
| goto disconnect_rcu_unlock; |
| } |
| |
| if (p_discard_my_data && nc->discard_my_data) { |
| drbd_err(connection, "incompatible %s settings\n", "discard-my-data"); |
| goto disconnect_rcu_unlock; |
| } |
| |
| if (p_two_primaries != nc->two_primaries) { |
| drbd_err(connection, "incompatible %s settings\n", "allow-two-primaries"); |
| goto disconnect_rcu_unlock; |
| } |
| |
| if (strcmp(integrity_alg, nc->integrity_alg)) { |
| drbd_err(connection, "incompatible %s settings\n", "data-integrity-alg"); |
| goto disconnect_rcu_unlock; |
| } |
| |
| rcu_read_unlock(); |
| } |
| |
| if (integrity_alg[0]) { |
| int hash_size; |
| |
| /* |
| * We can only change the peer data integrity algorithm |
| * here. Changing our own data integrity algorithm |
| * requires that we send a P_PROTOCOL_UPDATE packet at |
| * the same time; otherwise, the peer has no way to |
| * tell between which packets the algorithm should |
| * change. |
| */ |
| |
| peer_integrity_tfm = crypto_alloc_shash(integrity_alg, 0, 0); |
| if (IS_ERR(peer_integrity_tfm)) { |
| peer_integrity_tfm = NULL; |
| drbd_err(connection, "peer data-integrity-alg %s not supported\n", |
| integrity_alg); |
| goto disconnect; |
| } |
| |
| hash_size = crypto_shash_digestsize(peer_integrity_tfm); |
| int_dig_in = kmalloc(hash_size, GFP_KERNEL); |
| int_dig_vv = kmalloc(hash_size, GFP_KERNEL); |
| if (!(int_dig_in && int_dig_vv)) { |
| drbd_err(connection, "Allocation of buffers for data integrity checking failed\n"); |
| goto disconnect; |
| } |
| } |
| |
| new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); |
| if (!new_net_conf) |
| goto disconnect; |
| |
| mutex_lock(&connection->data.mutex); |
| mutex_lock(&connection->resource->conf_update); |
| old_net_conf = connection->net_conf; |
| *new_net_conf = *old_net_conf; |
| |
| new_net_conf->wire_protocol = p_proto; |
| new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); |
| new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); |
| new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); |
| new_net_conf->two_primaries = p_two_primaries; |
| |
| rcu_assign_pointer(connection->net_conf, new_net_conf); |
| mutex_unlock(&connection->resource->conf_update); |
| mutex_unlock(&connection->data.mutex); |
| |
| crypto_free_shash(connection->peer_integrity_tfm); |
| kfree(connection->int_dig_in); |
| kfree(connection->int_dig_vv); |
| connection->peer_integrity_tfm = peer_integrity_tfm; |
| connection->int_dig_in = int_dig_in; |
| connection->int_dig_vv = int_dig_vv; |
| |
| if (strcmp(old_net_conf->integrity_alg, integrity_alg)) |
| drbd_info(connection, "peer data-integrity-alg: %s\n", |
| integrity_alg[0] ? integrity_alg : "(none)"); |
| |
| kvfree_rcu(old_net_conf); |
| return 0; |
| |
| disconnect_rcu_unlock: |
| rcu_read_unlock(); |
| disconnect: |
| crypto_free_shash(peer_integrity_tfm); |
| kfree(int_dig_in); |
| kfree(int_dig_vv); |
| conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| return -EIO; |
| } |
| |
| /* 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. */ |
| static struct crypto_shash *drbd_crypto_alloc_digest_safe( |
| const struct drbd_device *device, |
| const char *alg, const char *name) |
| { |
| struct crypto_shash *tfm; |
| |
| if (!alg[0]) |
| return NULL; |
| |
| tfm = crypto_alloc_shash(alg, 0, 0); |
| if (IS_ERR(tfm)) { |
| drbd_err(device, "Can not allocate \"%s\" as %s (reason: %ld)\n", |
| alg, name, PTR_ERR(tfm)); |
| return tfm; |
| } |
| return tfm; |
| } |
| |
| static int ignore_remaining_packet(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| void *buffer = connection->data.rbuf; |
| int size = pi->size; |
| |
| while (size) { |
| int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); |
| s = drbd_recv(connection, buffer, s); |
| if (s <= 0) { |
| if (s < 0) |
| return s; |
| break; |
| } |
| size -= s; |
| } |
| if (size) |
| return -EIO; |
| return 0; |
| } |
| |
| /* |
| * config_unknown_volume - device configuration command for unknown volume |
| * |
| * When a device is added to an existing connection, the node on which the |
| * device is added first will send configuration commands to its peer but the |
| * peer will not know about the device yet. It will warn and ignore these |
| * commands. Once the device is added on the second node, the second node will |
| * send the same device configuration commands, but in the other direction. |
| * |
| * (We can also end up here if drbd is misconfigured.) |
| */ |
| static int config_unknown_volume(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| drbd_warn(connection, "%s packet received for volume %u, which is not configured locally\n", |
| cmdname(pi->cmd), pi->vnr); |
| return ignore_remaining_packet(connection, pi); |
| } |
| |
| static int receive_SyncParam(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_rs_param_95 *p; |
| unsigned int header_size, data_size, exp_max_sz; |
| struct crypto_shash *verify_tfm = NULL; |
| struct crypto_shash *csums_tfm = NULL; |
| struct net_conf *old_net_conf, *new_net_conf = NULL; |
| struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; |
| const int apv = connection->agreed_pro_version; |
| struct fifo_buffer *old_plan = NULL, *new_plan = NULL; |
| unsigned int fifo_size = 0; |
| int err; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return config_unknown_volume(connection, pi); |
| device = peer_device->device; |
| |
| 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 (pi->size > exp_max_sz) { |
| drbd_err(device, "SyncParam packet too long: received %u, expected <= %u bytes\n", |
| pi->size, exp_max_sz); |
| return -EIO; |
| } |
| |
| if (apv <= 88) { |
| header_size = sizeof(struct p_rs_param); |
| data_size = pi->size - header_size; |
| } else if (apv <= 94) { |
| header_size = sizeof(struct p_rs_param_89); |
| data_size = pi->size - header_size; |
| D_ASSERT(device, data_size == 0); |
| } else { |
| header_size = sizeof(struct p_rs_param_95); |
| data_size = pi->size - header_size; |
| D_ASSERT(device, data_size == 0); |
| } |
| |
| /* initialize verify_alg and csums_alg */ |
| p = pi->data; |
| BUILD_BUG_ON(sizeof(p->algs) != 2 * SHARED_SECRET_MAX); |
| memset(&p->algs, 0, sizeof(p->algs)); |
| |
| err = drbd_recv_all(peer_device->connection, p, header_size); |
| if (err) |
| return err; |
| |
| mutex_lock(&connection->resource->conf_update); |
| old_net_conf = peer_device->connection->net_conf; |
| if (get_ldev(device)) { |
| new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); |
| if (!new_disk_conf) { |
| put_ldev(device); |
| mutex_unlock(&connection->resource->conf_update); |
| drbd_err(device, "Allocation of new disk_conf failed\n"); |
| return -ENOMEM; |
| } |
| |
| old_disk_conf = device->ldev->disk_conf; |
| *new_disk_conf = *old_disk_conf; |
| |
| new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); |
| } |
| |
| if (apv >= 88) { |
| if (apv == 88) { |
| if (data_size > SHARED_SECRET_MAX || data_size == 0) { |
| drbd_err(device, "verify-alg of wrong size, " |
| "peer wants %u, accepting only up to %u byte\n", |
| data_size, SHARED_SECRET_MAX); |
| goto reconnect; |
| } |
| |
| err = drbd_recv_all(peer_device->connection, p->verify_alg, data_size); |
| if (err) |
| goto reconnect; |
| /* we expect NUL terminated string */ |
| /* but just in case someone tries to be evil */ |
| D_ASSERT(device, 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(device, p->verify_alg[SHARED_SECRET_MAX-1] == 0); |
| D_ASSERT(device, 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(old_net_conf->verify_alg, p->verify_alg)) { |
| if (device->state.conn == C_WF_REPORT_PARAMS) { |
| drbd_err(device, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", |
| old_net_conf->verify_alg, p->verify_alg); |
| goto disconnect; |
| } |
| verify_tfm = drbd_crypto_alloc_digest_safe(device, |
| p->verify_alg, "verify-alg"); |
| if (IS_ERR(verify_tfm)) { |
| verify_tfm = NULL; |
| goto disconnect; |
| } |
| } |
| |
| if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { |
| if (device->state.conn == C_WF_REPORT_PARAMS) { |
| drbd_err(device, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", |
| old_net_conf->csums_alg, p->csums_alg); |
| goto disconnect; |
| } |
| csums_tfm = drbd_crypto_alloc_digest_safe(device, |
| p->csums_alg, "csums-alg"); |
| if (IS_ERR(csums_tfm)) { |
| csums_tfm = NULL; |
| goto disconnect; |
| } |
| } |
| |
| if (apv > 94 && new_disk_conf) { |
| new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); |
| new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); |
| new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); |
| new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); |
| |
| fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; |
| if (fifo_size != device->rs_plan_s->size) { |
| new_plan = fifo_alloc(fifo_size); |
| if (!new_plan) { |
| drbd_err(device, "kmalloc of fifo_buffer failed"); |
| put_ldev(device); |
| goto disconnect; |
| } |
| } |
| } |
| |
| if (verify_tfm || csums_tfm) { |
| new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); |
| if (!new_net_conf) |
| goto disconnect; |
| |
| *new_net_conf = *old_net_conf; |
| |
| if (verify_tfm) { |
| strcpy(new_net_conf->verify_alg, p->verify_alg); |
| new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; |
| crypto_free_shash(peer_device->connection->verify_tfm); |
| peer_device->connection->verify_tfm = verify_tfm; |
| drbd_info(device, "using verify-alg: \"%s\"\n", p->verify_alg); |
| } |
| if (csums_tfm) { |
| strcpy(new_net_conf->csums_alg, p->csums_alg); |
| new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; |
| crypto_free_shash(peer_device->connection->csums_tfm); |
| peer_device->connection->csums_tfm = csums_tfm; |
| drbd_info(device, "using csums-alg: \"%s\"\n", p->csums_alg); |
| } |
| rcu_assign_pointer(connection->net_conf, new_net_conf); |
| } |
| } |
| |
| if (new_disk_conf) { |
| rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
| put_ldev(device); |
| } |
| |
| if (new_plan) { |
| old_plan = device->rs_plan_s; |
| rcu_assign_pointer(device->rs_plan_s, new_plan); |
| } |
| |
| mutex_unlock(&connection->resource->conf_update); |
| synchronize_rcu(); |
| if (new_net_conf) |
| kfree(old_net_conf); |
| kfree(old_disk_conf); |
| kfree(old_plan); |
| |
| return 0; |
| |
| reconnect: |
| if (new_disk_conf) { |
| put_ldev(device); |
| kfree(new_disk_conf); |
| } |
| mutex_unlock(&connection->resource->conf_update); |
| return -EIO; |
| |
| disconnect: |
| kfree(new_plan); |
| if (new_disk_conf) { |
| put_ldev(device); |
| kfree(new_disk_conf); |
| } |
| mutex_unlock(&connection->resource->conf_update); |
| /* just for completeness: actually not needed, |
| * as this is not reached if csums_tfm was ok. */ |
| crypto_free_shash(csums_tfm); |
| /* but free the verify_tfm again, if csums_tfm did not work out */ |
| crypto_free_shash(verify_tfm); |
| conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| return -EIO; |
| } |
| |
| /* warn if the arguments differ by more than 12.5% */ |
| static void warn_if_differ_considerably(struct drbd_device *device, |
| 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)) |
| drbd_warn(device, "Considerable difference in %s: %llus vs. %llus\n", s, |
| (unsigned long long)a, (unsigned long long)b); |
| } |
| |
| static int receive_sizes(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_sizes *p = pi->data; |
| struct o_qlim *o = (connection->agreed_features & DRBD_FF_WSAME) ? p->qlim : NULL; |
| enum determine_dev_size dd = DS_UNCHANGED; |
| sector_t p_size, p_usize, p_csize, my_usize; |
| sector_t new_size, cur_size; |
| int ldsc = 0; /* local disk size changed */ |
| enum dds_flags ddsf; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return config_unknown_volume(connection, pi); |
| device = peer_device->device; |
| cur_size = get_capacity(device->vdisk); |
| |
| p_size = be64_to_cpu(p->d_size); |
| p_usize = be64_to_cpu(p->u_size); |
| p_csize = be64_to_cpu(p->c_size); |
| |
| /* just store the peer's disk size for now. |
| * we still need to figure out whether we accept that. */ |
| device->p_size = p_size; |
| |
| if (get_ldev(device)) { |
| rcu_read_lock(); |
| my_usize = rcu_dereference(device->ldev->disk_conf)->disk_size; |
| rcu_read_unlock(); |
| |
| warn_if_differ_considerably(device, "lower level device sizes", |
| p_size, drbd_get_max_capacity(device->ldev)); |
| warn_if_differ_considerably(device, "user requested size", |
| p_usize, my_usize); |
| |
| /* if this is the first connect, or an otherwise expected |
| * param exchange, choose the minimum */ |
| if (device->state.conn == C_WF_REPORT_PARAMS) |
| p_usize = min_not_zero(my_usize, p_usize); |
| |
| /* Never shrink a device with usable data during connect, |
| * or "attach" on the peer. |
| * But allow online shrinking if we are connected. */ |
| new_size = drbd_new_dev_size(device, device->ldev, p_usize, 0); |
| if (new_size < cur_size && |
| device->state.disk >= D_OUTDATED && |
| (device->state.conn < C_CONNECTED || device->state.pdsk == D_DISKLESS)) { |
| drbd_err(device, "The peer's disk size is too small! (%llu < %llu sectors)\n", |
| (unsigned long long)new_size, (unsigned long long)cur_size); |
| conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| put_ldev(device); |
| return -EIO; |
| } |
| |
| if (my_usize != p_usize) { |
| struct disk_conf *old_disk_conf, *new_disk_conf = NULL; |
| |
| new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); |
| if (!new_disk_conf) { |
| put_ldev(device); |
| return -ENOMEM; |
| } |
| |
| mutex_lock(&connection->resource->conf_update); |
| old_disk_conf = device->ldev->disk_conf; |
| *new_disk_conf = *old_disk_conf; |
| new_disk_conf->disk_size = p_usize; |
| |
| rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
| mutex_unlock(&connection->resource->conf_update); |
| kvfree_rcu(old_disk_conf); |
| |
| drbd_info(device, "Peer sets u_size to %lu sectors (old: %lu)\n", |
| (unsigned long)p_usize, (unsigned long)my_usize); |
| } |
| |
| put_ldev(device); |
| } |
| |
| device->peer_max_bio_size = be32_to_cpu(p->max_bio_size); |
| /* Leave drbd_reconsider_queue_parameters() before drbd_determine_dev_size(). |
| In case we cleared the QUEUE_FLAG_DISCARD from our queue in |
| drbd_reconsider_queue_parameters(), we can be sure that after |
| drbd_determine_dev_size() no REQ_DISCARDs are in the queue. */ |
| |
| ddsf = be16_to_cpu(p->dds_flags); |
| if (get_ldev(device)) { |
| drbd_reconsider_queue_parameters(device, device->ldev, o); |
| dd = drbd_determine_dev_size(device, ddsf, NULL); |
| put_ldev(device); |
| if (dd == DS_ERROR) |
| return -EIO; |
| drbd_md_sync(device); |
| } else { |
| /* |
| * I am diskless, need to accept the peer's *current* size. |
| * I must NOT accept the peers backing disk size, |
| * it may have been larger than mine all along... |
| * |
| * At this point, the peer knows more about my disk, or at |
| * least about what we last agreed upon, than myself. |
| * So if his c_size is less than his d_size, the most likely |
| * reason is that *my* d_size was smaller last time we checked. |
| * |
| * However, if he sends a zero current size, |
| * take his (user-capped or) backing disk size anyways. |
| * |
| * Unless of course he does not have a disk himself. |
| * In which case we ignore this completely. |
| */ |
| sector_t new_size = p_csize ?: p_usize ?: p_size; |
| drbd_reconsider_queue_parameters(device, NULL, o); |
| if (new_size == 0) { |
| /* Ignore, peer does not know nothing. */ |
| } else if (new_size == cur_size) { |
| /* nothing to do */ |
| } else if (cur_size != 0 && p_size == 0) { |
| drbd_warn(device, "Ignored diskless peer device size (peer:%llu != me:%llu sectors)!\n", |
| (unsigned long long)new_size, (unsigned long long)cur_size); |
| } else if (new_size < cur_size && device->state.role == R_PRIMARY) { |
| drbd_err(device, "The peer's device size is too small! (%llu < %llu sectors); demote me first!\n", |
| (unsigned long long)new_size, (unsigned long long)cur_size); |
| conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| return -EIO; |
| } else { |
| /* I believe the peer, if |
| * - I don't have a current size myself |
| * - we agree on the size anyways |
| * - I do have a current size, am Secondary, |
| * and he has the only disk |
| * - I do have a current size, am Primary, |
| * and he has the only disk, |
| * which is larger than my current size |
| */ |
| drbd_set_my_capacity(device, new_size); |
| } |
| } |
| |
| if (get_ldev(device)) { |
| if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev)) { |
| device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev); |
| ldsc = 1; |
| } |
| |
| put_ldev(device); |
| } |
| |
| if (device->state.conn > C_WF_REPORT_PARAMS) { |
| if (be64_to_cpu(p->c_size) != get_capacity(device->vdisk) || |
| ldsc) { |
| /* we have different sizes, probably peer |
| * needs to know my new size... */ |
| drbd_send_sizes(peer_device, 0, ddsf); |
| } |
| if (test_and_clear_bit(RESIZE_PENDING, &device->flags) || |
| (dd == DS_GREW && device->state.conn == C_CONNECTED)) { |
| if (device->state.pdsk >= D_INCONSISTENT && |
| device->state.disk >= D_INCONSISTENT) { |
| if (ddsf & DDSF_NO_RESYNC) |
| drbd_info(device, "Resync of new storage suppressed with --assume-clean\n"); |
| else |
| resync_after_online_grow(device); |
| } else |
| set_bit(RESYNC_AFTER_NEG, &device->flags); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int receive_uuids(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_uuids *p = pi->data; |
| u64 *p_uuid; |
| int i, updated_uuids = 0; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return config_unknown_volume(connection, pi); |
| device = peer_device->device; |
| |
| p_uuid = kmalloc_array(UI_EXTENDED_SIZE, sizeof(*p_uuid), GFP_NOIO); |
| if (!p_uuid) |
| return false; |
| |
| for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) |
| p_uuid[i] = be64_to_cpu(p->uuid[i]); |
| |
| kfree(device->p_uuid); |
| device->p_uuid = p_uuid; |
| |
| if ((device->state.conn < C_CONNECTED || device->state.pdsk == D_DISKLESS) && |
| device->state.disk < D_INCONSISTENT && |
| device->state.role == R_PRIMARY && |
| (device->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { |
| drbd_err(device, "Can only connect to data with current UUID=%016llX\n", |
| (unsigned long long)device->ed_uuid); |
| conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| return -EIO; |
| } |
| |
| if (get_ldev(device)) { |
| int skip_initial_sync = |
| device->state.conn == C_CONNECTED && |
| peer_device->connection->agreed_pro_version >= 90 && |
| device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && |
| (p_uuid[UI_FLAGS] & 8); |
| if (skip_initial_sync) { |
| drbd_info(device, "Accepted new current UUID, preparing to skip initial sync\n"); |
| drbd_bitmap_io(device, &drbd_bmio_clear_n_write, |
| "clear_n_write from receive_uuids", |
| BM_LOCKED_TEST_ALLOWED); |
| _drbd_uuid_set(device, UI_CURRENT, p_uuid[UI_CURRENT]); |
| _drbd_uuid_set(device, UI_BITMAP, 0); |
| _drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), |
| CS_VERBOSE, NULL); |
| drbd_md_sync(device); |
| updated_uuids = 1; |
| } |
| put_ldev(device); |
| } else if (device->state.disk < D_INCONSISTENT && |
| device->state.role == R_PRIMARY) { |
| /* I am a diskless primary, the peer just created a new current UUID |
| for me. */ |
| updated_uuids = drbd_set_ed_uuid(device, 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... */ |
| mutex_lock(device->state_mutex); |
| mutex_unlock(device->state_mutex); |
| if (device->state.conn >= C_CONNECTED && device->state.disk < D_INCONSISTENT) |
| updated_uuids |= drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]); |
| |
| if (updated_uuids) |
| drbd_print_uuids(device, "receiver updated UUIDs to"); |
| |
| return 0; |
| } |
| |
| /** |
| * 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_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, |
| [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_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_req_state *p = pi->data; |
| union drbd_state mask, val; |
| enum drbd_state_rv rv; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| mask.i = be32_to_cpu(p->mask); |
| val.i = be32_to_cpu(p->val); |
| |
| if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) && |
| mutex_is_locked(device->state_mutex)) { |
| drbd_send_sr_reply(peer_device, SS_CONCURRENT_ST_CHG); |
| return 0; |
| } |
| |
| mask = convert_state(mask); |
| val = convert_state(val); |
| |
| rv = drbd_change_state(device, CS_VERBOSE, mask, val); |
| drbd_send_sr_reply(peer_device, rv); |
| |
| drbd_md_sync(device); |
| |
| return 0; |
| } |
| |
| static int receive_req_conn_state(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct p_req_state *p = pi->data; |
| union drbd_state mask, val; |
| enum drbd_state_rv rv; |
| |
| mask.i = be32_to_cpu(p->mask); |
| val.i = be32_to_cpu(p->val); |
| |
| if (test_bit(RESOLVE_CONFLICTS, &connection->flags) && |
| mutex_is_locked(&connection->cstate_mutex)) { |
| conn_send_sr_reply(connection, SS_CONCURRENT_ST_CHG); |
| return 0; |
| } |
| |
| mask = convert_state(mask); |
| val = convert_state(val); |
| |
| rv = conn_request_state(connection, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); |
| conn_send_sr_reply(connection, rv); |
| |
| return 0; |
| } |
| |
| static int receive_state(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_state *p = pi->data; |
| union drbd_state os, ns, peer_state; |
| enum drbd_disk_state real_peer_disk; |
| enum chg_state_flags cs_flags; |
| int rv; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return config_unknown_volume(connection, pi); |
| device = peer_device->device; |
| |
| peer_state.i = be32_to_cpu(p->state); |
| |
| real_peer_disk = peer_state.disk; |
| if (peer_state.disk == D_NEGOTIATING) { |
| real_peer_disk = device->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; |
| drbd_info(device, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); |
| } |
| |
| spin_lock_irq(&device->resource->req_lock); |
| retry: |
| os = ns = drbd_read_state(device); |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| /* If some other part of the code (ack_receiver thread, timeout) |
| * already decided to close the connection again, |
| * we must not "re-establish" it here. */ |
| if (os.conn <= C_TEAR_DOWN) |
| return -ECONNRESET; |
| |
| /* If this is the "end of sync" confirmation, usually the peer disk |
| * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits |
| * set) resync started in PausedSyncT, or if the timing of pause-/ |
| * unpause-sync events has been "just right", the peer disk may |
| * transition from D_CONSISTENT to D_UP_TO_DATE as well. |
| */ |
| if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && |
| real_peer_disk == D_UP_TO_DATE && |
| os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { |
| /* If we are (becoming) SyncSource, but peer is still in sync |
| * preparation, ignore its uptodate-ness to avoid flapping, it |
| * will change to inconsistent once the peer reaches active |
| * syncing states. |
| * It may have changed syncer-paused flags, however, so we |
| * cannot ignore this completely. */ |
| if (peer_state.conn > C_CONNECTED && |
| peer_state.conn < C_SYNC_SOURCE) |
| real_peer_disk = D_INCONSISTENT; |
| |
| /* if peer_state changes to connected at the same time, |
| * it explicitly notifies us that it finished resync. |
| * Maybe we should finish it up, too? */ |
| else if (os.conn >= C_SYNC_SOURCE && |
| peer_state.conn == C_CONNECTED) { |
| if (drbd_bm_total_weight(device) <= device->rs_failed) |
| drbd_resync_finished(device); |
| return 0; |
| } |
| } |
| |
| /* explicit verify finished notification, stop sector reached. */ |
| if (os.conn == C_VERIFY_T && os.disk == D_UP_TO_DATE && |
| peer_state.conn == C_CONNECTED && real_peer_disk == D_UP_TO_DATE) { |
| ov_out_of_sync_print(device); |
| drbd_resync_finished(device); |
| return 0; |
| } |
| |
| /* peer says his disk is inconsistent, while we think it is uptodate, |
| * and this happens while the peer still thinks we have a sync going on, |
| * but we think we are already done with the sync. |
| * We ignore this to avoid flapping pdsk. |
| * This should not happen, if the peer is a recent version of drbd. */ |
| if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && |
| os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) |
| real_peer_disk = D_UP_TO_DATE; |
| |
| if (ns.conn == C_WF_REPORT_PARAMS) |
| ns.conn = C_CONNECTED; |
| |
| if (peer_state.conn == C_AHEAD) |
| ns.conn = C_BEHIND; |
| |
| /* TODO: |
| * if (primary and diskless and peer uuid != effective uuid) |
| * abort attach on peer; |
| * |
| * If this node does not have good data, was already connected, but |
| * the peer did a late attach only now, trying to "negotiate" with me, |
| * AND I am currently Primary, possibly frozen, with some specific |
| * "effective" uuid, this should never be reached, really, because |
| * we first send the uuids, then the current state. |
| * |
| * In this scenario, we already dropped the connection hard |
| * when we received the unsuitable uuids (receive_uuids(). |
| * |
| * Should we want to change this, that is: not drop the connection in |
| * receive_uuids() already, then we would need to add a branch here |
| * that aborts the attach of "unsuitable uuids" on the peer in case |
| * this node is currently Diskless Primary. |
| */ |
| |
| if (device->p_uuid && peer_state.disk >= D_NEGOTIATING && |
| get_ldev_if_state(device, D_NEGOTIATING)) { |
| int cr; /* consider resync */ |
| |
| /* if we established a new connection */ |
| cr = (os.conn < C_CONNECTED); |
| /* if we had an established connection |
| * and one of the nodes newly attaches a disk */ |
| cr |= (os.conn == C_CONNECTED && |
| (peer_state.disk == D_NEGOTIATING || |
| os.disk == D_NEGOTIATING)); |
| /* if we have both been inconsistent, and the peer has been |
| * forced to be UpToDate with --force */ |
| cr |= test_bit(CONSIDER_RESYNC, &device->flags); |
| /* if we had been plain connected, and the admin requested to |
| * start a sync by "invalidate" or "invalidate-remote" */ |
| cr |= (os.conn == C_CONNECTED && |
| (peer_state.conn >= C_STARTING_SYNC_S && |
| peer_state.conn <= C_WF_BITMAP_T)); |
| |
| if (cr) |
| ns.conn = drbd_sync_handshake(peer_device, peer_state.role, real_peer_disk); |
| |
| put_ldev(device); |
| if (ns.conn == C_MASK) { |
| ns.conn = C_CONNECTED; |
| if (device->state.disk == D_NEGOTIATING) { |
| drbd_force_state(device, NS(disk, D_FAILED)); |
| } else if (peer_state.disk == D_NEGOTIATING) { |
| drbd_err(device, "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, &peer_device->connection->flags)) |
| return -EIO; |
| D_ASSERT(device, os.conn == C_WF_REPORT_PARAMS); |
| conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| return -EIO; |
| } |
| } |
| } |
| |
| spin_lock_irq(&device->resource->req_lock); |
| if (os.i != drbd_read_state(device).i) |
| goto retry; |
| clear_bit(CONSIDER_RESYNC, &device->flags); |
| ns.peer = peer_state.role; |
| ns.pdsk = real_peer_disk; |
| ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); |
| if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
| ns.disk = device->new_state_tmp.disk; |
| cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); |
| if (ns.pdsk == D_CONSISTENT && drbd_suspended(device) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && |
| test_bit(NEW_CUR_UUID, &device->flags)) { |
| /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this |
| for temporal network outages! */ |
| spin_unlock_irq(&device->resource->req_lock); |
| drbd_err(device, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); |
| tl_clear(peer_device->connection); |
| drbd_uuid_new_current(device); |
| clear_bit(NEW_CUR_UUID, &device->flags); |
| conn_request_state(peer_device->connection, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); |
| return -EIO; |
| } |
| rv = _drbd_set_state(device, ns, cs_flags, NULL); |
| ns = drbd_read_state(device); |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| if (rv < SS_SUCCESS) { |
| conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| return -EIO; |
| } |
| |
| if (os.conn > C_WF_REPORT_PARAMS) { |
| if (ns.conn > 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(peer_device); |
| drbd_send_current_state(peer_device); |
| } |
| } |
| |
| clear_bit(DISCARD_MY_DATA, &device->flags); |
| |
| drbd_md_sync(device); /* update connected indicator, la_size_sect, ... */ |
| |
| return 0; |
| } |
| |
| static int receive_sync_uuid(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_rs_uuid *p = pi->data; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| wait_event(device->misc_wait, |
| device->state.conn == C_WF_SYNC_UUID || |
| device->state.conn == C_BEHIND || |
| device->state.conn < C_CONNECTED || |
| device->state.disk < D_NEGOTIATING); |
| |
| /* D_ASSERT(device, device->state.conn == C_WF_SYNC_UUID ); */ |
| |
| /* Here the _drbd_uuid_ functions are right, current should |
| _not_ be rotated into the history */ |
| if (get_ldev_if_state(device, D_NEGOTIATING)) { |
| _drbd_uuid_set(device, UI_CURRENT, be64_to_cpu(p->uuid)); |
| _drbd_uuid_set(device, UI_BITMAP, 0UL); |
| |
| drbd_print_uuids(device, "updated sync uuid"); |
| drbd_start_resync(device, C_SYNC_TARGET); |
| |
| put_ldev(device); |
| } else |
| drbd_err(device, "Ignoring SyncUUID packet!\n"); |
| |
| return 0; |
| } |
| |
| /* |
| * receive_bitmap_plain |
| * |
| * Return 0 when done, 1 when another iteration is needed, and a negative error |
| * code upon failure. |
| */ |
| static int |
| receive_bitmap_plain(struct drbd_peer_device *peer_device, unsigned int size, |
| unsigned long *p, struct bm_xfer_ctx *c) |
| { |
| unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - |
| drbd_header_size(peer_device->connection); |
| unsigned int num_words = min_t(size_t, data_size / sizeof(*p), |
| c->bm_words - c->word_offset); |
| unsigned int want = num_words * sizeof(*p); |
| int err; |
| |
| if (want != size) { |
| drbd_err(peer_device, "%s:want (%u) != size (%u)\n", __func__, want, size); |
| return -EIO; |
| } |
| if (want == 0) |
| return 0; |
| err = drbd_recv_all(peer_device->connection, p, want); |
| if (err) |
| return err; |
| |
| drbd_bm_merge_lel(peer_device->device, c->word_offset, num_words, p); |
| |
| 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 1; |
| } |
| |
| static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) |
| { |
| return (enum drbd_bitmap_code)(p->encoding & 0x0f); |
| } |
| |
| static int dcbp_get_start(struct p_compressed_bm *p) |
| { |
| return (p->encoding & 0x80) != 0; |
| } |
| |
| static int dcbp_get_pad_bits(struct p_compressed_bm *p) |
| { |
| return (p->encoding >> 4) & 0x7; |
| } |
| |
| /* |
| * recv_bm_rle_bits |
| * |
| * Return 0 when done, 1 when another iteration is needed, and a negative error |
| * code upon failure. |
| */ |
| static int |
| recv_bm_rle_bits(struct drbd_peer_device *peer_device, |
| struct p_compressed_bm *p, |
| struct bm_xfer_ctx *c, |
| unsigned int len) |
| { |
| struct bitstream bs; |
| u64 look_ahead; |
| u64 rl; |
| u64 tmp; |
| unsigned long s = c->bit_offset; |
| unsigned long e; |
| 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 -EIO; |
| |
| for (have = bits; have > 0; s += rl, toggle = !toggle) { |
| bits = vli_decode_bits(&rl, look_ahead); |
| if (bits <= 0) |
| return -EIO; |
| |
| if (toggle) { |
| e = s + rl -1; |
| if (e >= c->bm_bits) { |
| drbd_err(peer_device, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); |
| return -EIO; |
| } |
| _drbd_bm_set_bits(peer_device->device, s, e); |
| } |
| |
| if (have < bits) { |
| drbd_err(peer_device, "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 -EIO; |
| } |
| /* if we consumed all 64 bits, assign 0; >> 64 is "undefined"; */ |
| if (likely(bits < 64)) |
| look_ahead >>= bits; |
| else |
| look_ahead = 0; |
| have -= bits; |
| |
| bits = bitstream_get_bits(&bs, &tmp, 64 - have); |
| if (bits < 0) |
| return -EIO; |
| look_ahead |= tmp << have; |
| have += bits; |
| } |
| |
| c->bit_offset = s; |
| bm_xfer_ctx_bit_to_word_offset(c); |
| |
| return (s != c->bm_bits); |
| } |
| |
| /* |
| * decode_bitmap_c |
| * |
| * Return 0 when done, 1 when another iteration is needed, and a negative error |
| * code upon failure. |
| */ |
| static int |
| decode_bitmap_c(struct drbd_peer_device *peer_device, |
| struct p_compressed_bm *p, |
| struct bm_xfer_ctx *c, |
| unsigned int len) |
| { |
| if (dcbp_get_code(p) == RLE_VLI_Bits) |
| return recv_bm_rle_bits(peer_device, p, c, len - sizeof(*p)); |
| |
| /* other variants had been implemented for evaluation, |
| * but have been dropped as this one turned out to be "best" |
| * during all our tests. */ |
| |
| drbd_err(peer_device, "receive_bitmap_c: unknown encoding %u\n", p->encoding); |
| conn_request_state(peer_device->connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
| return -EIO; |
| } |
| |
| void INFO_bm_xfer_stats(struct drbd_device *device, |
| const char *direction, struct bm_xfer_ctx *c) |
| { |
| /* what would it take to transfer it "plaintext" */ |
| unsigned int header_size = drbd_header_size(first_peer_device(device)->connection); |
| unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; |
| unsigned int plain = |
| header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + |
| c->bm_words * sizeof(unsigned long); |
| unsigned int total = c->bytes[0] + c->bytes[1]; |
| unsigned int 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; |
| drbd_info(device, "%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_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct bm_xfer_ctx c; |
| int err; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| drbd_bm_lock(device, "receive bitmap", BM_LOCKED_SET_ALLOWED); |
| /* you are supposed to send additional out-of-sync information |
| * if you actually set bits during this phase */ |
| |
| c = (struct bm_xfer_ctx) { |
| .bm_bits = drbd_bm_bits(device), |
| .bm_words = drbd_bm_words(device), |
| }; |
| |
| for(;;) { |
| if (pi->cmd == P_BITMAP) |
| err = receive_bitmap_plain(peer_device, pi->size, pi->data, &c); |
| else if (pi->cmd == P_COMPRESSED_BITMAP) { |
| /* MAYBE: sanity check that we speak proto >= 90, |
| * and the feature is enabled! */ |
| struct p_compressed_bm *p = pi->data; |
| |
| if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(connection)) { |
| drbd_err(device, "ReportCBitmap packet too large\n"); |
| err = -EIO; |
| goto out; |
| } |
| if (pi->size <= sizeof(*p)) { |
| drbd_err(device, "ReportCBitmap packet too small (l:%u)\n", pi->size); |
| err = -EIO; |
| goto out; |
| } |
| err = drbd_recv_all(peer_device->connection, p, pi->size); |
| if (err) |
| goto out; |
| err = decode_bitmap_c(peer_device, p, &c, pi->size); |
| } else { |
| drbd_warn(device, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); |
| err = -EIO; |
| goto out; |
| } |
| |
| c.packets[pi->cmd == P_BITMAP]++; |
| c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(connection) + pi->size; |
| |
| if (err <= 0) { |
| if (err < 0) |
| goto out; |
| break; |
| } |
| err = drbd_recv_header(peer_device->connection, pi); |
| if (err) |
| goto out; |
| } |
| |
| INFO_bm_xfer_stats(device, "receive", &c); |
| |
| if (device->state.conn == C_WF_BITMAP_T) { |
| enum drbd_state_rv rv; |
| |
| err = drbd_send_bitmap(device); |
| if (err) |
| goto out; |
| /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ |
| rv = _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
| D_ASSERT(device, rv == SS_SUCCESS); |
| } else if (device->state.conn != C_WF_BITMAP_S) { |
| /* admin may have requested C_DISCONNECTING, |
| * other threads may have noticed network errors */ |
| drbd_info(device, "unexpected cstate (%s) in receive_bitmap\n", |
| drbd_conn_str(device->state.conn)); |
| } |
| err = 0; |
| |
| out: |
| drbd_bm_unlock(device); |
| if (!err && device->state.conn == C_WF_BITMAP_S) |
| drbd_start_resync(device, C_SYNC_SOURCE); |
| return err; |
| } |
| |
| static int receive_skip(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| drbd_warn(connection, "skipping unknown optional packet type %d, l: %d!\n", |
| pi->cmd, pi->size); |
| |
| return ignore_remaining_packet(connection, pi); |
| } |
| |
| static int receive_UnplugRemote(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| /* Make sure we've acked all the TCP data associated |
| * with the data requests being unplugged */ |
| tcp_sock_set_quickack(connection->data.socket->sk, 2); |
| return 0; |
| } |
| |
| static int receive_out_of_sync(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_block_desc *p = pi->data; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| switch (device->state.conn) { |
| case C_WF_SYNC_UUID: |
| case C_WF_BITMAP_T: |
| case C_BEHIND: |
| break; |
| default: |
| drbd_err(device, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", |
| drbd_conn_str(device->state.conn)); |
| } |
| |
| drbd_set_out_of_sync(device, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); |
| |
| return 0; |
| } |
| |
| static int receive_rs_deallocated(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct p_block_desc *p = pi->data; |
| struct drbd_device *device; |
| sector_t sector; |
| int size, err = 0; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| sector = be64_to_cpu(p->sector); |
| size = be32_to_cpu(p->blksize); |
| |
| dec_rs_pending(device); |
| |
| if (get_ldev(device)) { |
| struct drbd_peer_request *peer_req; |
| const enum req_op op = REQ_OP_WRITE_ZEROES; |
| |
| peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER, sector, |
| size, 0, GFP_NOIO); |
| if (!peer_req) { |
| put_ldev(device); |
| return -ENOMEM; |
| } |
| |
| peer_req->w.cb = e_end_resync_block; |
| peer_req->submit_jif = jiffies; |
| peer_req->flags |= EE_TRIM; |
| |
| spin_lock_irq(&device->resource->req_lock); |
| list_add_tail(&peer_req->w.list, &device->sync_ee); |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| atomic_add(pi->size >> 9, &device->rs_sect_ev); |
| err = drbd_submit_peer_request(device, peer_req, op, |
| DRBD_FAULT_RS_WR); |
| |
| if (err) { |
| spin_lock_irq(&device->resource->req_lock); |
| list_del(&peer_req->w.list); |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| drbd_free_peer_req(device, peer_req); |
| put_ldev(device); |
| err = 0; |
| goto fail; |
| } |
| |
| inc_unacked(device); |
| |
| /* No put_ldev() here. Gets called in drbd_endio_write_sec_final(), |
| as well as drbd_rs_complete_io() */ |
| } else { |
| fail: |
| drbd_rs_complete_io(device, sector); |
| drbd_send_ack_ex(peer_device, P_NEG_ACK, sector, size, ID_SYNCER); |
| } |
| |
| atomic_add(size >> 9, &device->rs_sect_in); |
| |
| return err; |
| } |
| |
| struct data_cmd { |
| int expect_payload; |
| unsigned int pkt_size; |
| int (*fn)(struct drbd_connection *, struct packet_info *); |
| }; |
| |
| static struct data_cmd drbd_cmd_handler[] = { |
| [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, |
| [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, |
| [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , |
| [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , |
| [P_BITMAP] = { 1, 0, receive_bitmap } , |
| [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , |
| [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, |
| [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
| [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
| [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, |
| [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, |
| [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, |
| [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, |
| [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, |
| [P_STATE] = { 0, sizeof(struct p_state), receive_state }, |
| [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, |
| [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, |
| [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
| [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, |
| [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, |
| [P_RS_THIN_REQ] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
| [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, |
| [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, |
| [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, |
| [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, |
| [P_TRIM] = { 0, sizeof(struct p_trim), receive_Data }, |
| [P_ZEROES] = { 0, sizeof(struct p_trim), receive_Data }, |
| [P_RS_DEALLOCATED] = { 0, sizeof(struct p_block_desc), receive_rs_deallocated }, |
| }; |
| |
| static void drbdd(struct drbd_connection *connection) |
| { |
| struct packet_info pi; |
| size_t shs; /* sub header size */ |
| int err; |
| |
| while (get_t_state(&connection->receiver) == RUNNING) { |
| struct data_cmd const *cmd; |
| |
| drbd_thread_current_set_cpu(&connection->receiver); |
| update_receiver_timing_details(connection, drbd_recv_header_maybe_unplug); |
| if (drbd_recv_header_maybe_unplug(connection, &pi)) |
| goto err_out; |
| |
| cmd = &drbd_cmd_handler[pi.cmd]; |
| if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { |
| drbd_err(connection, "Unexpected data packet %s (0x%04x)", |
| cmdname(pi.cmd), pi.cmd); |
| goto err_out; |
| } |
| |
| shs = cmd->pkt_size; |
| if (pi.cmd == P_SIZES && connection->agreed_features & DRBD_FF_WSAME) |
| shs += sizeof(struct o_qlim); |
| if (pi.size > shs && !cmd->expect_payload) { |
| drbd_err(connection, "No payload expected %s l:%d\n", |
| cmdname(pi.cmd), pi.size); |
| goto err_out; |
| } |
| if (pi.size < shs) { |
| drbd_err(connection, "%s: unexpected packet size, expected:%d received:%d\n", |
| cmdname(pi.cmd), (int)shs, pi.size); |
| goto err_out; |
| } |
| |
| if (shs) { |
| update_receiver_timing_details(connection, drbd_recv_all_warn); |
| err = drbd_recv_all_warn(connection, pi.data, shs); |
| if (err) |
| goto err_out; |
| pi.size -= shs; |
| } |
| |
| update_receiver_timing_details(connection, cmd->fn); |
| err = cmd->fn(connection, &pi); |
| if (err) { |
| drbd_err(connection, "error receiving %s, e: %d l: %d!\n", |
| cmdname(pi.cmd), err, pi.size); |
| goto err_out; |
| } |
| } |
| return; |
| |
| err_out: |
| conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
| } |
| |
| static void conn_disconnect(struct drbd_connection *connection) |
| { |
| struct drbd_peer_device *peer_device; |
| enum drbd_conns oc; |
| int vnr; |
| |
| if (connection->cstate == C_STANDALONE) |
| return; |
| |
| /* We are about to start the cleanup after connection loss. |
| * Make sure drbd_make_request knows about that. |
| * Usually we should be in some network failure state already, |
| * but just in case we are not, we fix it up here. |
| */ |
| conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
| |
| /* ack_receiver does not clean up anything. it must not interfere, either */ |
| drbd_thread_stop(&connection->ack_receiver); |
| if (connection->ack_sender) { |
| destroy_workqueue(connection->ack_sender); |
| connection->ack_sender = NULL; |
| } |
| drbd_free_sock(connection); |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| kref_get(&device->kref); |
| rcu_read_unlock(); |
| drbd_disconnected(peer_device); |
| kref_put(&device->kref, drbd_destroy_device); |
| rcu_read_lock(); |
| } |
| rcu_read_unlock(); |
| |
| if (!list_empty(&connection->current_epoch->list)) |
| drbd_err(connection, "ASSERTION FAILED: connection->current_epoch->list not empty\n"); |
| /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ |
| atomic_set(&connection->current_epoch->epoch_size, 0); |
| connection->send.seen_any_write_yet = false; |
| |
| drbd_info(connection, "Connection closed\n"); |
| |
| if (conn_highest_role(connection) == R_PRIMARY && conn_highest_pdsk(connection) >= D_UNKNOWN) |
| conn_try_outdate_peer_async(connection); |
| |
| spin_lock_irq(&connection->resource->req_lock); |
| oc = connection->cstate; |
| if (oc >= C_UNCONNECTED) |
| _conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE); |
| |
| spin_unlock_irq(&connection->resource->req_lock); |
| |
| if (oc == C_DISCONNECTING) |
| conn_request_state(connection, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); |
| } |
| |
| static int drbd_disconnected(struct drbd_peer_device *peer_device) |
| { |
| struct drbd_device *device = peer_device->device; |
| unsigned int i; |
| |
| /* wait for current activity to cease. */ |
| spin_lock_irq(&device->resource->req_lock); |
| _drbd_wait_ee_list_empty(device, &device->active_ee); |
| _drbd_wait_ee_list_empty(device, &device->sync_ee); |
| _drbd_wait_ee_list_empty(device, &device->read_ee); |
| spin_unlock_irq(&device->resource->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(device); |
| device->rs_total = 0; |
| device->rs_failed = 0; |
| atomic_set(&device->rs_pending_cnt, 0); |
| wake_up(&device->misc_wait); |
| |
| del_timer_sync(&device->resync_timer); |
| resync_timer_fn(&device->resync_timer); |
| |
| /* 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(&peer_device->connection->sender_work); |
| |
| drbd_finish_peer_reqs(device); |
| |
| /* This second workqueue flush is necessary, since drbd_finish_peer_reqs() |
| might have issued a work again. The one before drbd_finish_peer_reqs() is |
| necessary to reclain net_ee in drbd_finish_peer_reqs(). */ |
| drbd_flush_workqueue(&peer_device->connection->sender_work); |
| |
| /* need to do it again, drbd_finish_peer_reqs() may have populated it |
| * again via drbd_try_clear_on_disk_bm(). */ |
| drbd_rs_cancel_all(device); |
| |
| kfree(device->p_uuid); |
| device->p_uuid = NULL; |
| |
| if (!drbd_suspended(device)) |
| tl_clear(peer_device->connection); |
| |
| drbd_md_sync(device); |
| |
| if (get_ldev(device)) { |
| drbd_bitmap_io(device, &drbd_bm_write_copy_pages, |
| "write from disconnected", BM_LOCKED_CHANGE_ALLOWED); |
| put_ldev(device); |
| } |
| |
| /* 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_free_peer_reqs(device, &device->net_ee); |
| if (i) |
| drbd_info(device, "net_ee not empty, killed %u entries\n", i); |
| i = atomic_read(&device->pp_in_use_by_net); |
| if (i) |
| drbd_info(device, "pp_in_use_by_net = %d, expected 0\n", i); |
| i = atomic_read(&device->pp_in_use); |
| if (i) |
| drbd_info(device, "pp_in_use = %d, expected 0\n", i); |
| |
| D_ASSERT(device, list_empty(&device->read_ee)); |
| D_ASSERT(device, list_empty(&device->active_ee)); |
| D_ASSERT(device, list_empty(&device->sync_ee)); |
| D_ASSERT(device, list_empty(&device->done_ee)); |
| |
| return 0; |
| } |
| |
| /* |
| * 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_features(struct drbd_connection *connection) |
| { |
| struct drbd_socket *sock; |
| struct p_connection_features *p; |
| |
| sock = &connection->data; |
| p = conn_prepare_command(connection, sock); |
| if (!p) |
| return -EIO; |
| memset(p, 0, sizeof(*p)); |
| p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); |
| p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); |
| p->feature_flags = cpu_to_be32(PRO_FEATURES); |
| return conn_send_command(connection, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); |
| } |
| |
| /* |
| * 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_features(struct drbd_connection *connection) |
| { |
| /* ASSERT current == connection->receiver ... */ |
| struct p_connection_features *p; |
| const int expect = sizeof(struct p_connection_features); |
| struct packet_info pi; |
| int err; |
| |
| err = drbd_send_features(connection); |
| if (err) |
| return 0; |
| |
| err = drbd_recv_header(connection, &pi); |
| if (err) |
| return 0; |
| |
| if (pi.cmd != P_CONNECTION_FEATURES) { |
| drbd_err(connection, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", |
| cmdname(pi.cmd), pi.cmd); |
| return -1; |
| } |
| |
| if (pi.size != expect) { |
| drbd_err(connection, "expected ConnectionFeatures length: %u, received: %u\n", |
| expect, pi.size); |
| return -1; |
| } |
| |
| p = pi.data; |
| err = drbd_recv_all_warn(connection, p, expect); |
| if (err) |
| 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; |
| |
| connection->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); |
| connection->agreed_features = PRO_FEATURES & be32_to_cpu(p->feature_flags); |
| |
| drbd_info(connection, "Handshake successful: " |
| "Agreed network protocol version %d\n", connection->agreed_pro_version); |
| |
| drbd_info(connection, "Feature flags enabled on protocol level: 0x%x%s%s%s%s.\n", |
| connection->agreed_features, |
| connection->agreed_features & DRBD_FF_TRIM ? " TRIM" : "", |
| connection->agreed_features & DRBD_FF_THIN_RESYNC ? " THIN_RESYNC" : "", |
| connection->agreed_features & DRBD_FF_WSAME ? " WRITE_SAME" : "", |
| connection->agreed_features & DRBD_FF_WZEROES ? " WRITE_ZEROES" : |
| connection->agreed_features ? "" : " none"); |
| |
| return 1; |
| |
| incompat: |
| drbd_err(connection, "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_connection *connection) |
| { |
| drbd_err(connection, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); |
| drbd_err(connection, "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_connection *connection) |
| { |
| struct drbd_socket *sock; |
| char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ |
| char *response = NULL; |
| char *right_response = NULL; |
| char *peers_ch = NULL; |
| unsigned int key_len; |
| char secret[SHARED_SECRET_MAX]; /* 64 byte */ |
| unsigned int resp_size; |
| struct shash_desc *desc; |
| struct packet_info pi; |
| struct net_conf *nc; |
| int err, rv; |
| |
| /* FIXME: Put the challenge/response into the preallocated socket buffer. */ |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(connection->net_conf); |
| key_len = strlen(nc->shared_secret); |
| memcpy(secret, nc->shared_secret, key_len); |
| rcu_read_unlock(); |
| |
| desc = kmalloc(sizeof(struct shash_desc) + |
| crypto_shash_descsize(connection->cram_hmac_tfm), |
| GFP_KERNEL); |
| if (!desc) { |
| rv = -1; |
| goto fail; |
| } |
| desc->tfm = connection->cram_hmac_tfm; |
| |
| rv = crypto_shash_setkey(connection->cram_hmac_tfm, (u8 *)secret, key_len); |
| if (rv) { |
| drbd_err(connection, "crypto_shash_setkey() failed with %d\n", rv); |
| rv = -1; |
| goto fail; |
| } |
| |
| get_random_bytes(my_challenge, CHALLENGE_LEN); |
| |
| sock = &connection->data; |
| if (!conn_prepare_command(connection, sock)) { |
| rv = 0; |
| goto fail; |
| } |
| rv = !conn_send_command(connection, sock, P_AUTH_CHALLENGE, 0, |
| my_challenge, CHALLENGE_LEN); |
| if (!rv) |
| goto fail; |
| |
| err = drbd_recv_header(connection, &pi); |
| if (err) { |
| rv = 0; |
| goto fail; |
| } |
| |
| if (pi.cmd != P_AUTH_CHALLENGE) { |
| drbd_err(connection, "expected AuthChallenge packet, received: %s (0x%04x)\n", |
| cmdname(pi.cmd), pi.cmd); |
| rv = -1; |
| goto fail; |
| } |
| |
| if (pi.size > CHALLENGE_LEN * 2) { |
| drbd_err(connection, "expected AuthChallenge payload too big.\n"); |
| rv = -1; |
| goto fail; |
| } |
| |
| if (pi.size < CHALLENGE_LEN) { |
| drbd_err(connection, "AuthChallenge payload too small.\n"); |
| rv = -1; |
| goto fail; |
| } |
| |
| peers_ch = kmalloc(pi.size, GFP_NOIO); |
| if (!peers_ch) { |
| rv = -1; |
| goto fail; |
| } |
| |
| err = drbd_recv_all_warn(connection, peers_ch, pi.size); |
| if (err) { |
| rv = 0; |
| goto fail; |
| } |
| |
| if (!memcmp(my_challenge, peers_ch, CHALLENGE_LEN)) { |
| drbd_err(connection, "Peer presented the same challenge!\n"); |
| rv = -1; |
| goto fail; |
| } |
| |
| resp_size = crypto_shash_digestsize(connection->cram_hmac_tfm); |
| response = kmalloc(resp_size, GFP_NOIO); |
| if (!response) { |
| rv = -1; |
| goto fail; |
| } |
| |
| rv = crypto_shash_digest(desc, peers_ch, pi.size, response); |
| if (rv) { |
| drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); |
| rv = -1; |
| goto fail; |
| } |
| |
| if (!conn_prepare_command(connection, sock)) { |
| rv = 0; |
| goto fail; |
| } |
| rv = !conn_send_command(connection, sock, P_AUTH_RESPONSE, 0, |
| response, resp_size); |
| if (!rv) |
| goto fail; |
| |
| err = drbd_recv_header(connection, &pi); |
| if (err) { |
| rv = 0; |
| goto fail; |
| } |
| |
| if (pi.cmd != P_AUTH_RESPONSE) { |
| drbd_err(connection, "expected AuthResponse packet, received: %s (0x%04x)\n", |
| cmdname(pi.cmd), pi.cmd); |
| rv = 0; |
| goto fail; |
| } |
| |
| if (pi.size != resp_size) { |
| drbd_err(connection, "expected AuthResponse payload of wrong size\n"); |
| rv = 0; |
| goto fail; |
| } |
| |
| err = drbd_recv_all_warn(connection, response , resp_size); |
| if (err) { |
| rv = 0; |
| goto fail; |
| } |
| |
| right_response = kmalloc(resp_size, GFP_NOIO); |
| if (!right_response) { |
| rv = -1; |
| goto fail; |
| } |
| |
| rv = crypto_shash_digest(desc, my_challenge, CHALLENGE_LEN, |
| right_response); |
| if (rv) { |
| drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); |
| rv = -1; |
| goto fail; |
| } |
| |
| rv = !memcmp(response, right_response, resp_size); |
| |
| if (rv) |
| drbd_info(connection, "Peer authenticated using %d bytes HMAC\n", |
| resp_size); |
| else |
| rv = -1; |
| |
| fail: |
| kfree(peers_ch); |
| kfree(response); |
| kfree(right_response); |
| if (desc) { |
| shash_desc_zero(desc); |
| kfree(desc); |
| } |
| |
| return rv; |
| } |
| #endif |
| |
| int drbd_receiver(struct drbd_thread *thi) |
| { |
| struct drbd_connection *connection = thi->connection; |
| int h; |
| |
| drbd_info(connection, "receiver (re)started\n"); |
| |
| do { |
| h = conn_connect(connection); |
| if (h == 0) { |
| conn_disconnect(connection); |
| schedule_timeout_interruptible(HZ); |
| } |
| if (h == -1) { |
| drbd_warn(connection, "Discarding network configuration.\n"); |
| conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| } |
| } while (h == 0); |
| |
| if (h > 0) { |
| blk_start_plug(&connection->receiver_plug); |
| drbdd(connection); |
| blk_finish_plug(&connection->receiver_plug); |
| } |
| |
| conn_disconnect(connection); |
| |
| drbd_info(connection, "receiver terminated\n"); |
| return 0; |
| } |
| |
| /* ********* acknowledge sender ******** */ |
| |
| static int got_conn_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct p_req_state_reply *p = pi->data; |
| int retcode = be32_to_cpu(p->retcode); |
| |
| if (retcode >= SS_SUCCESS) { |
| set_bit(CONN_WD_ST_CHG_OKAY, &connection->flags); |
| } else { |
| set_bit(CONN_WD_ST_CHG_FAIL, &connection->flags); |
| drbd_err(connection, "Requested state change failed by peer: %s (%d)\n", |
| drbd_set_st_err_str(retcode), retcode); |
| } |
| wake_up(&connection->ping_wait); |
| |
| return 0; |
| } |
| |
| static int got_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_req_state_reply *p = pi->data; |
| int retcode = be32_to_cpu(p->retcode); |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| if (test_bit(CONN_WD_ST_CHG_REQ, &connection->flags)) { |
| D_ASSERT(device, connection->agreed_pro_version < 100); |
| return got_conn_RqSReply(connection, pi); |
| } |
| |
| if (retcode >= SS_SUCCESS) { |
| set_bit(CL_ST_CHG_SUCCESS, &device->flags); |
| } else { |
| set_bit(CL_ST_CHG_FAIL, &device->flags); |
| drbd_err(device, "Requested state change failed by peer: %s (%d)\n", |
| drbd_set_st_err_str(retcode), retcode); |
| } |
| wake_up(&device->state_wait); |
| |
| return 0; |
| } |
| |
| static int got_Ping(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| return drbd_send_ping_ack(connection); |
| |
| } |
| |
| static int got_PingAck(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| /* restore idle timeout */ |
| connection->meta.socket->sk->sk_rcvtimeo = connection->net_conf->ping_int*HZ; |
| if (!test_and_set_bit(GOT_PING_ACK, &connection->flags)) |
| wake_up(&connection->ping_wait); |
| |
| return 0; |
| } |
| |
| static int got_IsInSync(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_block_ack *p = pi->data; |
| sector_t sector = be64_to_cpu(p->sector); |
| int blksize = be32_to_cpu(p->blksize); |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
| |
| update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
| |
| if (get_ldev(device)) { |
| drbd_rs_complete_io(device, sector); |
| drbd_set_in_sync(device, sector, blksize); |
| /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ |
| device->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); |
| put_ldev(device); |
| } |
| dec_rs_pending(device); |
| atomic_add(blksize >> 9, &device->rs_sect_in); |
| |
| return 0; |
| } |
| |
| static int |
| validate_req_change_req_state(struct drbd_device *device, u64 id, sector_t sector, |
| struct rb_root *root, const char *func, |
| enum drbd_req_event what, bool missing_ok) |
| { |
| struct drbd_request *req; |
| struct bio_and_error m; |
| |
| spin_lock_irq(&device->resource->req_lock); |
| req = find_request(device, root, id, sector, missing_ok, func); |
| if (unlikely(!req)) { |
| spin_unlock_irq(&device->resource->req_lock); |
| return -EIO; |
| } |
| __req_mod(req, what, &m); |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| if (m.bio) |
| complete_master_bio(device, &m); |
| return 0; |
| } |
| |
| static int got_BlockAck(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_block_ack *p = pi->data; |
| sector_t sector = be64_to_cpu(p->sector); |
| int blksize = be32_to_cpu(p->blksize); |
| enum drbd_req_event what; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
| |
| if (p->block_id == ID_SYNCER) { |
| drbd_set_in_sync(device, sector, blksize); |
| dec_rs_pending(device); |
| return 0; |
| } |
| switch (pi->cmd) { |
| case P_RS_WRITE_ACK: |
| what = WRITE_ACKED_BY_PEER_AND_SIS; |
| break; |
| case P_WRITE_ACK: |
| what = WRITE_ACKED_BY_PEER; |
| break; |
| case P_RECV_ACK: |
| what = RECV_ACKED_BY_PEER; |
| break; |
| case P_SUPERSEDED: |
| what = CONFLICT_RESOLVED; |
| break; |
| case P_RETRY_WRITE: |
| what = POSTPONE_WRITE; |
| break; |
| default: |
| BUG(); |
| } |
| |
| return validate_req_change_req_state(device, p->block_id, sector, |
| &device->write_requests, __func__, |
| what, false); |
| } |
| |
| static int got_NegAck(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_block_ack *p = pi->data; |
| sector_t sector = be64_to_cpu(p->sector); |
| int size = be32_to_cpu(p->blksize); |
| int err; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
| |
| if (p->block_id == ID_SYNCER) { |
| dec_rs_pending(device); |
| drbd_rs_failed_io(device, sector, size); |
| return 0; |
| } |
| |
| err = validate_req_change_req_state(device, p->block_id, sector, |
| &device->write_requests, __func__, |
| NEG_ACKED, true); |
| if (err) { |
| /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. |
| The master bio might already be completed, therefore the |
| request is no longer in the collision hash. */ |
| /* In Protocol B we might already have got a P_RECV_ACK |
| but then get a P_NEG_ACK afterwards. */ |
| drbd_set_out_of_sync(device, sector, size); |
| } |
| return 0; |
| } |
| |
| static int got_NegDReply(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_block_ack *p = pi->data; |
| sector_t sector = be64_to_cpu(p->sector); |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
| |
| drbd_err(device, "Got NegDReply; Sector %llus, len %u.\n", |
| (unsigned long long)sector, be32_to_cpu(p->blksize)); |
| |
| return validate_req_change_req_state(device, p->block_id, sector, |
| &device->read_requests, __func__, |
| NEG_ACKED, false); |
| } |
| |
| static int got_NegRSDReply(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| sector_t sector; |
| int size; |
| struct p_block_ack *p = pi->data; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| sector = be64_to_cpu(p->sector); |
| size = be32_to_cpu(p->blksize); |
| |
| update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
| |
| dec_rs_pending(device); |
| |
| if (get_ldev_if_state(device, D_FAILED)) { |
| drbd_rs_complete_io(device, sector); |
| switch (pi->cmd) { |
| case P_NEG_RS_DREPLY: |
| drbd_rs_failed_io(device, sector, size); |
| break; |
| case P_RS_CANCEL: |
| break; |
| default: |
| BUG(); |
| } |
| put_ldev(device); |
| } |
| |
| return 0; |
| } |
| |
| static int got_BarrierAck(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct p_barrier_ack *p = pi->data; |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| tl_release(connection, p->barrier, be32_to_cpu(p->set_size)); |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| |
| if (device->state.conn == C_AHEAD && |
| atomic_read(&device->ap_in_flight) == 0 && |
| !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &device->flags)) { |
| device->start_resync_timer.expires = jiffies + HZ; |
| add_timer(&device->start_resync_timer); |
| } |
| } |
| rcu_read_unlock(); |
| |
| return 0; |
| } |
| |
| static int got_OVResult(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_device *device; |
| struct p_block_ack *p = pi->data; |
| struct drbd_device_work *dw; |
| sector_t sector; |
| int size; |
| |
| peer_device = conn_peer_device(connection, pi->vnr); |
| if (!peer_device) |
| return -EIO; |
| device = peer_device->device; |
| |
| sector = be64_to_cpu(p->sector); |
| size = be32_to_cpu(p->blksize); |
| |
| update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
| |
| if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) |
| drbd_ov_out_of_sync_found(device, sector, size); |
| else |
| ov_out_of_sync_print(device); |
| |
| if (!get_ldev(device)) |
| return 0; |
| |
| drbd_rs_complete_io(device, sector); |
| dec_rs_pending(device); |
| |
| --device->ov_left; |
| |
| /* let's advance progress step marks only for every other megabyte */ |
| if ((device->ov_left & 0x200) == 0x200) |
| drbd_advance_rs_marks(device, device->ov_left); |
| |
| if (device->ov_left == 0) { |
| dw = kmalloc(sizeof(*dw), GFP_NOIO); |
| if (dw) { |
| dw->w.cb = w_ov_finished; |
| dw->device = device; |
| drbd_queue_work(&peer_device->connection->sender_work, &dw->w); |
| } else { |
| drbd_err(device, "kmalloc(dw) failed."); |
| ov_out_of_sync_print(device); |
| drbd_resync_finished(device); |
| } |
| } |
| put_ldev(device); |
| return 0; |
| } |
| |
| static int got_skip(struct drbd_connection *connection, struct packet_info *pi) |
| { |
| return 0; |
| } |
| |
| struct meta_sock_cmd { |
| size_t pkt_size; |
| int (*fn)(struct drbd_connection *connection, struct packet_info *); |
| }; |
| |
| static void set_rcvtimeo(struct drbd_connection *connection, bool ping_timeout) |
| { |
| long t; |
| struct net_conf *nc; |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(connection->net_conf); |
| t = ping_timeout ? nc->ping_timeo : nc->ping_int; |
| rcu_read_unlock(); |
| |
| t *= HZ; |
| if (ping_timeout) |
| t /= 10; |
| |
| connection->meta.socket->sk->sk_rcvtimeo = t; |
| } |
| |
| static void set_ping_timeout(struct drbd_connection *connection) |
| { |
| set_rcvtimeo(connection, 1); |
| } |
| |
| static void set_idle_timeout(struct drbd_connection *connection) |
| { |
| set_rcvtimeo(connection, 0); |
| } |
| |
| static struct meta_sock_cmd ack_receiver_tbl[] = { |
| [P_PING] = { 0, got_Ping }, |
| [P_PING_ACK] = { 0, 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_SUPERSEDED] = { 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_probe93), got_skip }, |
| [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, |
| [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, |
| [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, |
| }; |
| |
| int drbd_ack_receiver(struct drbd_thread *thi) |
| { |
| struct drbd_connection *connection = thi->connection; |
| struct meta_sock_cmd *cmd = NULL; |
| struct packet_info pi; |
| unsigned long pre_recv_jif; |
| int rv; |
| void *buf = connection->meta.rbuf; |
| int received = 0; |
| unsigned int header_size = drbd_header_size(connection); |
| int expect = header_size; |
| bool ping_timeout_active = false; |
| |
| sched_set_fifo_low(current); |
| |
| while (get_t_state(thi) == RUNNING) { |
| drbd_thread_current_set_cpu(thi); |
| |
| conn_reclaim_net_peer_reqs(connection); |
| |
| if (test_and_clear_bit(SEND_PING, &connection->flags)) { |
| if (drbd_send_ping(connection)) { |
| drbd_err(connection, "drbd_send_ping has failed\n"); |
| goto reconnect; |
| } |
| set_ping_timeout(connection); |
| ping_timeout_active = true; |
| } |
| |
| pre_recv_jif = jiffies; |
| rv = drbd_recv_short(connection->meta.socket, buf, expect-received, 0); |
| |
| /* 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) { |
| if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
| long t; |
| rcu_read_lock(); |
| t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
| rcu_read_unlock(); |
| |
| t = wait_event_timeout(connection->ping_wait, |
| connection->cstate < C_WF_REPORT_PARAMS, |
| t); |
| if (t) |
| break; |
| } |
| drbd_err(connection, "meta connection shut down by peer.\n"); |
| goto reconnect; |
| } else if (rv == -EAGAIN) { |
| /* If the data socket received something meanwhile, |
| * that is good enough: peer is still alive. */ |
| if (time_after(connection->last_received, pre_recv_jif)) |
| continue; |
| if (ping_timeout_active) { |
| drbd_err(connection, "PingAck did not arrive in time.\n"); |
| goto reconnect; |
| } |
| set_bit(SEND_PING, &connection->flags); |
| continue; |
| } else if (rv == -EINTR) { |
| /* maybe drbd_thread_stop(): the while condition will notice. |
| * maybe woken for send_ping: we'll send a ping above, |
| * and change the rcvtimeo */ |
| flush_signals(current); |
| continue; |
| } else { |
| drbd_err(connection, "sock_recvmsg returned %d\n", rv); |
| goto reconnect; |
| } |
| |
| if (received == expect && cmd == NULL) { |
| if (decode_header(connection, connection->meta.rbuf, &pi)) |
| goto reconnect; |
| cmd = &ack_receiver_tbl[pi.cmd]; |
| if (pi.cmd >= ARRAY_SIZE(ack_receiver_tbl) || !cmd->fn) { |
| drbd_err(connection, "Unexpected meta packet %s (0x%04x)\n", |
| cmdname(pi.cmd), pi.cmd); |
| goto disconnect; |
| } |
| expect = header_size + cmd->pkt_size; |
| if (pi.size != expect - header_size) { |
| drbd_err(connection, "Wrong packet size on meta (c: %d, l: %d)\n", |
| pi.cmd, pi.size); |
| goto reconnect; |
| } |
| } |
| if (received == expect) { |
| bool err; |
| |
| err = cmd->fn(connection, &pi); |
| if (err) { |
| drbd_err(connection, "%ps failed\n", cmd->fn); |
| goto reconnect; |
| } |
| |
| connection->last_received = jiffies; |
| |
| if (cmd == &ack_receiver_tbl[P_PING_ACK]) { |
| set_idle_timeout(connection); |
| ping_timeout_active = false; |
| } |
| |
| buf = connection->meta.rbuf; |
| received = 0; |
| expect = header_size; |
| cmd = NULL; |
| } |
| } |
| |
| if (0) { |
| reconnect: |
| conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
| conn_md_sync(connection); |
| } |
| if (0) { |
| disconnect: |
| conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
| } |
| |
| drbd_info(connection, "ack_receiver terminated\n"); |
| |
| return 0; |
| } |
| |
| void drbd_send_acks_wf(struct work_struct *ws) |
| { |
| struct drbd_peer_device *peer_device = |
| container_of(ws, struct drbd_peer_device, send_acks_work); |
| struct drbd_connection *connection = peer_device->connection; |
| struct drbd_device *device = peer_device->device; |
| struct net_conf *nc; |
| int tcp_cork, err; |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(connection->net_conf); |
| tcp_cork = nc->tcp_cork; |
| rcu_read_unlock(); |
| |
| if (tcp_cork) |
| tcp_sock_set_cork(connection->meta.socket->sk, true); |
| |
| err = drbd_finish_peer_reqs(device); |
| kref_put(&device->kref, drbd_destroy_device); |
| /* get is in drbd_endio_write_sec_final(). That is necessary to keep the |
| struct work_struct send_acks_work alive, which is in the peer_device object */ |
| |
| if (err) { |
| conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
| return; |
| } |
| |
| if (tcp_cork) |
| tcp_sock_set_cork(connection->meta.socket->sk, false); |
| |
| return; |
| } |