| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| drbd.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>. |
| |
| Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev |
| from Logicworks, Inc. for making SDP replication support possible. |
| |
| |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/jiffies.h> |
| #include <linux/drbd.h> |
| #include <linux/uaccess.h> |
| #include <asm/types.h> |
| #include <net/sock.h> |
| #include <linux/ctype.h> |
| #include <linux/mutex.h> |
| #include <linux/fs.h> |
| #include <linux/file.h> |
| #include <linux/proc_fs.h> |
| #include <linux/init.h> |
| #include <linux/mm.h> |
| #include <linux/memcontrol.h> |
| #include <linux/mm_inline.h> |
| #include <linux/slab.h> |
| #include <linux/random.h> |
| #include <linux/reboot.h> |
| #include <linux/notifier.h> |
| #include <linux/kthread.h> |
| #include <linux/workqueue.h> |
| #include <linux/unistd.h> |
| #include <linux/vmalloc.h> |
| #include <linux/sched/signal.h> |
| |
| #include <linux/drbd_limits.h> |
| #include "drbd_int.h" |
| #include "drbd_protocol.h" |
| #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */ |
| #include "drbd_vli.h" |
| #include "drbd_debugfs.h" |
| |
| static DEFINE_MUTEX(drbd_main_mutex); |
| static int drbd_open(struct gendisk *disk, blk_mode_t mode); |
| static void drbd_release(struct gendisk *gd); |
| static void md_sync_timer_fn(struct timer_list *t); |
| static int w_bitmap_io(struct drbd_work *w, int unused); |
| |
| MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, " |
| "Lars Ellenberg <lars@linbit.com>"); |
| MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION); |
| MODULE_VERSION(REL_VERSION); |
| MODULE_LICENSE("GPL"); |
| MODULE_PARM_DESC(minor_count, "Approximate number of drbd devices (" |
| __stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")"); |
| MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR); |
| |
| #include <linux/moduleparam.h> |
| /* thanks to these macros, if compiled into the kernel (not-module), |
| * these become boot parameters (e.g., drbd.minor_count) */ |
| |
| #ifdef CONFIG_DRBD_FAULT_INJECTION |
| int drbd_enable_faults; |
| int drbd_fault_rate; |
| static int drbd_fault_count; |
| static int drbd_fault_devs; |
| /* bitmap of enabled faults */ |
| module_param_named(enable_faults, drbd_enable_faults, int, 0664); |
| /* fault rate % value - applies to all enabled faults */ |
| module_param_named(fault_rate, drbd_fault_rate, int, 0664); |
| /* count of faults inserted */ |
| module_param_named(fault_count, drbd_fault_count, int, 0664); |
| /* bitmap of devices to insert faults on */ |
| module_param_named(fault_devs, drbd_fault_devs, int, 0644); |
| #endif |
| |
| /* module parameters we can keep static */ |
| static bool drbd_allow_oos; /* allow_open_on_secondary */ |
| static bool drbd_disable_sendpage; |
| MODULE_PARM_DESC(allow_oos, "DONT USE!"); |
| module_param_named(allow_oos, drbd_allow_oos, bool, 0); |
| module_param_named(disable_sendpage, drbd_disable_sendpage, bool, 0644); |
| |
| /* module parameters we share */ |
| int drbd_proc_details; /* Detail level in proc drbd*/ |
| module_param_named(proc_details, drbd_proc_details, int, 0644); |
| /* module parameters shared with defaults */ |
| unsigned int drbd_minor_count = DRBD_MINOR_COUNT_DEF; |
| /* Module parameter for setting the user mode helper program |
| * to run. Default is /sbin/drbdadm */ |
| char drbd_usermode_helper[80] = "/sbin/drbdadm"; |
| module_param_named(minor_count, drbd_minor_count, uint, 0444); |
| module_param_string(usermode_helper, drbd_usermode_helper, sizeof(drbd_usermode_helper), 0644); |
| |
| /* in 2.6.x, our device mapping and config info contains our virtual gendisks |
| * as member "struct gendisk *vdisk;" |
| */ |
| struct idr drbd_devices; |
| struct list_head drbd_resources; |
| struct mutex resources_mutex; |
| |
| struct kmem_cache *drbd_request_cache; |
| struct kmem_cache *drbd_ee_cache; /* peer requests */ |
| struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ |
| struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ |
| mempool_t drbd_request_mempool; |
| mempool_t drbd_ee_mempool; |
| mempool_t drbd_md_io_page_pool; |
| struct bio_set drbd_md_io_bio_set; |
| struct bio_set drbd_io_bio_set; |
| |
| /* I do not use a standard mempool, because: |
| 1) I want to hand out the pre-allocated objects first. |
| 2) I want to be able to interrupt sleeping allocation with a signal. |
| Note: This is a single linked list, the next pointer is the private |
| member of struct page. |
| */ |
| struct page *drbd_pp_pool; |
| DEFINE_SPINLOCK(drbd_pp_lock); |
| int drbd_pp_vacant; |
| wait_queue_head_t drbd_pp_wait; |
| |
| DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5); |
| |
| static const struct block_device_operations drbd_ops = { |
| .owner = THIS_MODULE, |
| .submit_bio = drbd_submit_bio, |
| .open = drbd_open, |
| .release = drbd_release, |
| }; |
| |
| #ifdef __CHECKER__ |
| /* When checking with sparse, and this is an inline function, sparse will |
| give tons of false positives. When this is a real functions sparse works. |
| */ |
| int _get_ldev_if_state(struct drbd_device *device, enum drbd_disk_state mins) |
| { |
| int io_allowed; |
| |
| atomic_inc(&device->local_cnt); |
| io_allowed = (device->state.disk >= mins); |
| if (!io_allowed) { |
| if (atomic_dec_and_test(&device->local_cnt)) |
| wake_up(&device->misc_wait); |
| } |
| return io_allowed; |
| } |
| |
| #endif |
| |
| /** |
| * tl_release() - mark as BARRIER_ACKED all requests in the corresponding transfer log epoch |
| * @connection: DRBD connection. |
| * @barrier_nr: Expected identifier of the DRBD write barrier packet. |
| * @set_size: Expected number of requests before that barrier. |
| * |
| * In case the passed barrier_nr or set_size does not match the oldest |
| * epoch of not yet barrier-acked requests, this function will cause a |
| * termination of the connection. |
| */ |
| void tl_release(struct drbd_connection *connection, unsigned int barrier_nr, |
| unsigned int set_size) |
| { |
| struct drbd_request *r; |
| struct drbd_request *req = NULL, *tmp = NULL; |
| int expect_epoch = 0; |
| int expect_size = 0; |
| |
| spin_lock_irq(&connection->resource->req_lock); |
| |
| /* find oldest not yet barrier-acked write request, |
| * count writes in its epoch. */ |
| list_for_each_entry(r, &connection->transfer_log, tl_requests) { |
| const unsigned s = r->rq_state; |
| if (!req) { |
| if (!(s & RQ_WRITE)) |
| continue; |
| if (!(s & RQ_NET_MASK)) |
| continue; |
| if (s & RQ_NET_DONE) |
| continue; |
| req = r; |
| expect_epoch = req->epoch; |
| expect_size ++; |
| } else { |
| if (r->epoch != expect_epoch) |
| break; |
| if (!(s & RQ_WRITE)) |
| continue; |
| /* if (s & RQ_DONE): not expected */ |
| /* if (!(s & RQ_NET_MASK)): not expected */ |
| expect_size++; |
| } |
| } |
| |
| /* first some paranoia code */ |
| if (req == NULL) { |
| drbd_err(connection, "BAD! BarrierAck #%u received, but no epoch in tl!?\n", |
| barrier_nr); |
| goto bail; |
| } |
| if (expect_epoch != barrier_nr) { |
| drbd_err(connection, "BAD! BarrierAck #%u received, expected #%u!\n", |
| barrier_nr, expect_epoch); |
| goto bail; |
| } |
| |
| if (expect_size != set_size) { |
| drbd_err(connection, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n", |
| barrier_nr, set_size, expect_size); |
| goto bail; |
| } |
| |
| /* Clean up list of requests processed during current epoch. */ |
| /* this extra list walk restart is paranoia, |
| * to catch requests being barrier-acked "unexpectedly". |
| * It usually should find the same req again, or some READ preceding it. */ |
| list_for_each_entry(req, &connection->transfer_log, tl_requests) |
| if (req->epoch == expect_epoch) { |
| tmp = req; |
| break; |
| } |
| req = list_prepare_entry(tmp, &connection->transfer_log, tl_requests); |
| list_for_each_entry_safe_from(req, r, &connection->transfer_log, tl_requests) { |
| struct drbd_peer_device *peer_device; |
| if (req->epoch != expect_epoch) |
| break; |
| peer_device = conn_peer_device(connection, req->device->vnr); |
| _req_mod(req, BARRIER_ACKED, peer_device); |
| } |
| spin_unlock_irq(&connection->resource->req_lock); |
| |
| return; |
| |
| bail: |
| spin_unlock_irq(&connection->resource->req_lock); |
| conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
| } |
| |
| |
| /** |
| * _tl_restart() - Walks the transfer log, and applies an action to all requests |
| * @connection: DRBD connection to operate on. |
| * @what: The action/event to perform with all request objects |
| * |
| * @what might be one of CONNECTION_LOST_WHILE_PENDING, RESEND, FAIL_FROZEN_DISK_IO, |
| * RESTART_FROZEN_DISK_IO. |
| */ |
| /* must hold resource->req_lock */ |
| void _tl_restart(struct drbd_connection *connection, enum drbd_req_event what) |
| { |
| struct drbd_peer_device *peer_device; |
| struct drbd_request *req, *r; |
| |
| list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests) { |
| peer_device = conn_peer_device(connection, req->device->vnr); |
| _req_mod(req, what, peer_device); |
| } |
| } |
| |
| void tl_restart(struct drbd_connection *connection, enum drbd_req_event what) |
| { |
| spin_lock_irq(&connection->resource->req_lock); |
| _tl_restart(connection, what); |
| spin_unlock_irq(&connection->resource->req_lock); |
| } |
| |
| /** |
| * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL |
| * @connection: DRBD connection. |
| * |
| * This is called after the connection to the peer was lost. The storage covered |
| * by the requests on the transfer gets marked as our of sync. Called from the |
| * receiver thread and the worker thread. |
| */ |
| void tl_clear(struct drbd_connection *connection) |
| { |
| tl_restart(connection, CONNECTION_LOST_WHILE_PENDING); |
| } |
| |
| /** |
| * tl_abort_disk_io() - Abort disk I/O for all requests for a certain device in the TL |
| * @device: DRBD device. |
| */ |
| void tl_abort_disk_io(struct drbd_device *device) |
| { |
| struct drbd_connection *connection = first_peer_device(device)->connection; |
| struct drbd_request *req, *r; |
| |
| spin_lock_irq(&connection->resource->req_lock); |
| list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests) { |
| if (!(req->rq_state & RQ_LOCAL_PENDING)) |
| continue; |
| if (req->device != device) |
| continue; |
| _req_mod(req, ABORT_DISK_IO, NULL); |
| } |
| spin_unlock_irq(&connection->resource->req_lock); |
| } |
| |
| static int drbd_thread_setup(void *arg) |
| { |
| struct drbd_thread *thi = (struct drbd_thread *) arg; |
| struct drbd_resource *resource = thi->resource; |
| unsigned long flags; |
| int retval; |
| |
| snprintf(current->comm, sizeof(current->comm), "drbd_%c_%s", |
| thi->name[0], |
| resource->name); |
| |
| allow_kernel_signal(DRBD_SIGKILL); |
| allow_kernel_signal(SIGXCPU); |
| restart: |
| retval = thi->function(thi); |
| |
| spin_lock_irqsave(&thi->t_lock, flags); |
| |
| /* if the receiver has been "EXITING", the last thing it did |
| * was set the conn state to "StandAlone", |
| * if now a re-connect request comes in, conn state goes C_UNCONNECTED, |
| * and receiver thread will be "started". |
| * drbd_thread_start needs to set "RESTARTING" in that case. |
| * t_state check and assignment needs to be within the same spinlock, |
| * so either thread_start sees EXITING, and can remap to RESTARTING, |
| * or thread_start see NONE, and can proceed as normal. |
| */ |
| |
| if (thi->t_state == RESTARTING) { |
| drbd_info(resource, "Restarting %s thread\n", thi->name); |
| thi->t_state = RUNNING; |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| goto restart; |
| } |
| |
| thi->task = NULL; |
| thi->t_state = NONE; |
| smp_mb(); |
| complete_all(&thi->stop); |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| |
| drbd_info(resource, "Terminating %s\n", current->comm); |
| |
| /* Release mod reference taken when thread was started */ |
| |
| if (thi->connection) |
| kref_put(&thi->connection->kref, drbd_destroy_connection); |
| kref_put(&resource->kref, drbd_destroy_resource); |
| module_put(THIS_MODULE); |
| return retval; |
| } |
| |
| static void drbd_thread_init(struct drbd_resource *resource, struct drbd_thread *thi, |
| int (*func) (struct drbd_thread *), const char *name) |
| { |
| spin_lock_init(&thi->t_lock); |
| thi->task = NULL; |
| thi->t_state = NONE; |
| thi->function = func; |
| thi->resource = resource; |
| thi->connection = NULL; |
| thi->name = name; |
| } |
| |
| int drbd_thread_start(struct drbd_thread *thi) |
| { |
| struct drbd_resource *resource = thi->resource; |
| struct task_struct *nt; |
| unsigned long flags; |
| |
| /* is used from state engine doing drbd_thread_stop_nowait, |
| * while holding the req lock irqsave */ |
| spin_lock_irqsave(&thi->t_lock, flags); |
| |
| switch (thi->t_state) { |
| case NONE: |
| drbd_info(resource, "Starting %s thread (from %s [%d])\n", |
| thi->name, current->comm, current->pid); |
| |
| /* Get ref on module for thread - this is released when thread exits */ |
| if (!try_module_get(THIS_MODULE)) { |
| drbd_err(resource, "Failed to get module reference in drbd_thread_start\n"); |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| return false; |
| } |
| |
| kref_get(&resource->kref); |
| if (thi->connection) |
| kref_get(&thi->connection->kref); |
| |
| init_completion(&thi->stop); |
| thi->reset_cpu_mask = 1; |
| thi->t_state = RUNNING; |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| flush_signals(current); /* otherw. may get -ERESTARTNOINTR */ |
| |
| nt = kthread_create(drbd_thread_setup, (void *) thi, |
| "drbd_%c_%s", thi->name[0], thi->resource->name); |
| |
| if (IS_ERR(nt)) { |
| drbd_err(resource, "Couldn't start thread\n"); |
| |
| if (thi->connection) |
| kref_put(&thi->connection->kref, drbd_destroy_connection); |
| kref_put(&resource->kref, drbd_destroy_resource); |
| module_put(THIS_MODULE); |
| return false; |
| } |
| spin_lock_irqsave(&thi->t_lock, flags); |
| thi->task = nt; |
| thi->t_state = RUNNING; |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| wake_up_process(nt); |
| break; |
| case EXITING: |
| thi->t_state = RESTARTING; |
| drbd_info(resource, "Restarting %s thread (from %s [%d])\n", |
| thi->name, current->comm, current->pid); |
| fallthrough; |
| case RUNNING: |
| case RESTARTING: |
| default: |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| break; |
| } |
| |
| return true; |
| } |
| |
| |
| void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait) |
| { |
| unsigned long flags; |
| |
| enum drbd_thread_state ns = restart ? RESTARTING : EXITING; |
| |
| /* may be called from state engine, holding the req lock irqsave */ |
| spin_lock_irqsave(&thi->t_lock, flags); |
| |
| if (thi->t_state == NONE) { |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| if (restart) |
| drbd_thread_start(thi); |
| return; |
| } |
| |
| if (thi->t_state != ns) { |
| if (thi->task == NULL) { |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| return; |
| } |
| |
| thi->t_state = ns; |
| smp_mb(); |
| init_completion(&thi->stop); |
| if (thi->task != current) |
| send_sig(DRBD_SIGKILL, thi->task, 1); |
| } |
| |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| |
| if (wait) |
| wait_for_completion(&thi->stop); |
| } |
| |
| #ifdef CONFIG_SMP |
| /* |
| * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs |
| * |
| * Forces all threads of a resource onto the same CPU. This is beneficial for |
| * DRBD's performance. May be overwritten by user's configuration. |
| */ |
| static void drbd_calc_cpu_mask(cpumask_var_t *cpu_mask) |
| { |
| unsigned int *resources_per_cpu, min_index = ~0; |
| |
| resources_per_cpu = kcalloc(nr_cpu_ids, sizeof(*resources_per_cpu), |
| GFP_KERNEL); |
| if (resources_per_cpu) { |
| struct drbd_resource *resource; |
| unsigned int cpu, min = ~0; |
| |
| rcu_read_lock(); |
| for_each_resource_rcu(resource, &drbd_resources) { |
| for_each_cpu(cpu, resource->cpu_mask) |
| resources_per_cpu[cpu]++; |
| } |
| rcu_read_unlock(); |
| for_each_online_cpu(cpu) { |
| if (resources_per_cpu[cpu] < min) { |
| min = resources_per_cpu[cpu]; |
| min_index = cpu; |
| } |
| } |
| kfree(resources_per_cpu); |
| } |
| if (min_index == ~0) { |
| cpumask_setall(*cpu_mask); |
| return; |
| } |
| cpumask_set_cpu(min_index, *cpu_mask); |
| } |
| |
| /** |
| * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread |
| * @thi: drbd_thread object |
| * |
| * call in the "main loop" of _all_ threads, no need for any mutex, current won't die |
| * prematurely. |
| */ |
| void drbd_thread_current_set_cpu(struct drbd_thread *thi) |
| { |
| struct drbd_resource *resource = thi->resource; |
| struct task_struct *p = current; |
| |
| if (!thi->reset_cpu_mask) |
| return; |
| thi->reset_cpu_mask = 0; |
| set_cpus_allowed_ptr(p, resource->cpu_mask); |
| } |
| #else |
| #define drbd_calc_cpu_mask(A) ({}) |
| #endif |
| |
| /* |
| * drbd_header_size - size of a packet header |
| * |
| * The header size is a multiple of 8, so any payload following the header is |
| * word aligned on 64-bit architectures. (The bitmap send and receive code |
| * relies on this.) |
| */ |
| unsigned int drbd_header_size(struct drbd_connection *connection) |
| { |
| if (connection->agreed_pro_version >= 100) { |
| BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100), 8)); |
| return sizeof(struct p_header100); |
| } else { |
| BUILD_BUG_ON(sizeof(struct p_header80) != |
| sizeof(struct p_header95)); |
| BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80), 8)); |
| return sizeof(struct p_header80); |
| } |
| } |
| |
| static unsigned int prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size) |
| { |
| h->magic = cpu_to_be32(DRBD_MAGIC); |
| h->command = cpu_to_be16(cmd); |
| h->length = cpu_to_be16(size); |
| return sizeof(struct p_header80); |
| } |
| |
| static unsigned int prepare_header95(struct p_header95 *h, enum drbd_packet cmd, int size) |
| { |
| h->magic = cpu_to_be16(DRBD_MAGIC_BIG); |
| h->command = cpu_to_be16(cmd); |
| h->length = cpu_to_be32(size); |
| return sizeof(struct p_header95); |
| } |
| |
| static unsigned int prepare_header100(struct p_header100 *h, enum drbd_packet cmd, |
| int size, int vnr) |
| { |
| h->magic = cpu_to_be32(DRBD_MAGIC_100); |
| h->volume = cpu_to_be16(vnr); |
| h->command = cpu_to_be16(cmd); |
| h->length = cpu_to_be32(size); |
| h->pad = 0; |
| return sizeof(struct p_header100); |
| } |
| |
| static unsigned int prepare_header(struct drbd_connection *connection, int vnr, |
| void *buffer, enum drbd_packet cmd, int size) |
| { |
| if (connection->agreed_pro_version >= 100) |
| return prepare_header100(buffer, cmd, size, vnr); |
| else if (connection->agreed_pro_version >= 95 && |
| size > DRBD_MAX_SIZE_H80_PACKET) |
| return prepare_header95(buffer, cmd, size); |
| else |
| return prepare_header80(buffer, cmd, size); |
| } |
| |
| static void *__conn_prepare_command(struct drbd_connection *connection, |
| struct drbd_socket *sock) |
| { |
| if (!sock->socket) |
| return NULL; |
| return sock->sbuf + drbd_header_size(connection); |
| } |
| |
| void *conn_prepare_command(struct drbd_connection *connection, struct drbd_socket *sock) |
| { |
| void *p; |
| |
| mutex_lock(&sock->mutex); |
| p = __conn_prepare_command(connection, sock); |
| if (!p) |
| mutex_unlock(&sock->mutex); |
| |
| return p; |
| } |
| |
| void *drbd_prepare_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock) |
| { |
| return conn_prepare_command(peer_device->connection, sock); |
| } |
| |
| static int __send_command(struct drbd_connection *connection, int vnr, |
| struct drbd_socket *sock, enum drbd_packet cmd, |
| unsigned int header_size, void *data, |
| unsigned int size) |
| { |
| int msg_flags; |
| int err; |
| |
| /* |
| * Called with @data == NULL and the size of the data blocks in @size |
| * for commands that send data blocks. For those commands, omit the |
| * MSG_MORE flag: this will increase the likelihood that data blocks |
| * which are page aligned on the sender will end up page aligned on the |
| * receiver. |
| */ |
| msg_flags = data ? MSG_MORE : 0; |
| |
| header_size += prepare_header(connection, vnr, sock->sbuf, cmd, |
| header_size + size); |
| err = drbd_send_all(connection, sock->socket, sock->sbuf, header_size, |
| msg_flags); |
| if (data && !err) |
| err = drbd_send_all(connection, sock->socket, data, size, 0); |
| /* DRBD protocol "pings" are latency critical. |
| * This is supposed to trigger tcp_push_pending_frames() */ |
| if (!err && (cmd == P_PING || cmd == P_PING_ACK)) |
| tcp_sock_set_nodelay(sock->socket->sk); |
| |
| return err; |
| } |
| |
| static int __conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock, |
| enum drbd_packet cmd, unsigned int header_size, |
| void *data, unsigned int size) |
| { |
| return __send_command(connection, 0, sock, cmd, header_size, data, size); |
| } |
| |
| int conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock, |
| enum drbd_packet cmd, unsigned int header_size, |
| void *data, unsigned int size) |
| { |
| int err; |
| |
| err = __conn_send_command(connection, sock, cmd, header_size, data, size); |
| mutex_unlock(&sock->mutex); |
| return err; |
| } |
| |
| int drbd_send_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock, |
| enum drbd_packet cmd, unsigned int header_size, |
| void *data, unsigned int size) |
| { |
| int err; |
| |
| err = __send_command(peer_device->connection, peer_device->device->vnr, |
| sock, cmd, header_size, data, size); |
| mutex_unlock(&sock->mutex); |
| return err; |
| } |
| |
| int drbd_send_ping(struct drbd_connection *connection) |
| { |
| struct drbd_socket *sock; |
| |
| sock = &connection->meta; |
| if (!conn_prepare_command(connection, sock)) |
| return -EIO; |
| return conn_send_command(connection, sock, P_PING, 0, NULL, 0); |
| } |
| |
| int drbd_send_ping_ack(struct drbd_connection *connection) |
| { |
| struct drbd_socket *sock; |
| |
| sock = &connection->meta; |
| if (!conn_prepare_command(connection, sock)) |
| return -EIO; |
| return conn_send_command(connection, sock, P_PING_ACK, 0, NULL, 0); |
| } |
| |
| int drbd_send_sync_param(struct drbd_peer_device *peer_device) |
| { |
| struct drbd_socket *sock; |
| struct p_rs_param_95 *p; |
| int size; |
| const int apv = peer_device->connection->agreed_pro_version; |
| enum drbd_packet cmd; |
| struct net_conf *nc; |
| struct disk_conf *dc; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) |
| return -EIO; |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(peer_device->connection->net_conf); |
| |
| size = apv <= 87 ? sizeof(struct p_rs_param) |
| : apv == 88 ? sizeof(struct p_rs_param) |
| + strlen(nc->verify_alg) + 1 |
| : apv <= 94 ? sizeof(struct p_rs_param_89) |
| : /* apv >= 95 */ sizeof(struct p_rs_param_95); |
| |
| cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM; |
| |
| /* initialize verify_alg and csums_alg */ |
| BUILD_BUG_ON(sizeof(p->algs) != 2 * SHARED_SECRET_MAX); |
| memset(&p->algs, 0, sizeof(p->algs)); |
| |
| if (get_ldev(peer_device->device)) { |
| dc = rcu_dereference(peer_device->device->ldev->disk_conf); |
| p->resync_rate = cpu_to_be32(dc->resync_rate); |
| p->c_plan_ahead = cpu_to_be32(dc->c_plan_ahead); |
| p->c_delay_target = cpu_to_be32(dc->c_delay_target); |
| p->c_fill_target = cpu_to_be32(dc->c_fill_target); |
| p->c_max_rate = cpu_to_be32(dc->c_max_rate); |
| put_ldev(peer_device->device); |
| } else { |
| p->resync_rate = cpu_to_be32(DRBD_RESYNC_RATE_DEF); |
| p->c_plan_ahead = cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF); |
| p->c_delay_target = cpu_to_be32(DRBD_C_DELAY_TARGET_DEF); |
| p->c_fill_target = cpu_to_be32(DRBD_C_FILL_TARGET_DEF); |
| p->c_max_rate = cpu_to_be32(DRBD_C_MAX_RATE_DEF); |
| } |
| |
| if (apv >= 88) |
| strcpy(p->verify_alg, nc->verify_alg); |
| if (apv >= 89) |
| strcpy(p->csums_alg, nc->csums_alg); |
| rcu_read_unlock(); |
| |
| return drbd_send_command(peer_device, sock, cmd, size, NULL, 0); |
| } |
| |
| int __drbd_send_protocol(struct drbd_connection *connection, enum drbd_packet cmd) |
| { |
| struct drbd_socket *sock; |
| struct p_protocol *p; |
| struct net_conf *nc; |
| int size, cf; |
| |
| sock = &connection->data; |
| p = __conn_prepare_command(connection, sock); |
| if (!p) |
| return -EIO; |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(connection->net_conf); |
| |
| if (nc->tentative && connection->agreed_pro_version < 92) { |
| rcu_read_unlock(); |
| drbd_err(connection, "--dry-run is not supported by peer"); |
| return -EOPNOTSUPP; |
| } |
| |
| size = sizeof(*p); |
| if (connection->agreed_pro_version >= 87) |
| size += strlen(nc->integrity_alg) + 1; |
| |
| p->protocol = cpu_to_be32(nc->wire_protocol); |
| p->after_sb_0p = cpu_to_be32(nc->after_sb_0p); |
| p->after_sb_1p = cpu_to_be32(nc->after_sb_1p); |
| p->after_sb_2p = cpu_to_be32(nc->after_sb_2p); |
| p->two_primaries = cpu_to_be32(nc->two_primaries); |
| cf = 0; |
| if (nc->discard_my_data) |
| cf |= CF_DISCARD_MY_DATA; |
| if (nc->tentative) |
| cf |= CF_DRY_RUN; |
| p->conn_flags = cpu_to_be32(cf); |
| |
| if (connection->agreed_pro_version >= 87) |
| strcpy(p->integrity_alg, nc->integrity_alg); |
| rcu_read_unlock(); |
| |
| return __conn_send_command(connection, sock, cmd, size, NULL, 0); |
| } |
| |
| int drbd_send_protocol(struct drbd_connection *connection) |
| { |
| int err; |
| |
| mutex_lock(&connection->data.mutex); |
| err = __drbd_send_protocol(connection, P_PROTOCOL); |
| mutex_unlock(&connection->data.mutex); |
| |
| return err; |
| } |
| |
| static int _drbd_send_uuids(struct drbd_peer_device *peer_device, u64 uuid_flags) |
| { |
| struct drbd_device *device = peer_device->device; |
| struct drbd_socket *sock; |
| struct p_uuids *p; |
| int i; |
| |
| if (!get_ldev_if_state(device, D_NEGOTIATING)) |
| return 0; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) { |
| put_ldev(device); |
| return -EIO; |
| } |
| spin_lock_irq(&device->ldev->md.uuid_lock); |
| for (i = UI_CURRENT; i < UI_SIZE; i++) |
| p->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]); |
| spin_unlock_irq(&device->ldev->md.uuid_lock); |
| |
| device->comm_bm_set = drbd_bm_total_weight(device); |
| p->uuid[UI_SIZE] = cpu_to_be64(device->comm_bm_set); |
| rcu_read_lock(); |
| uuid_flags |= rcu_dereference(peer_device->connection->net_conf)->discard_my_data ? 1 : 0; |
| rcu_read_unlock(); |
| uuid_flags |= test_bit(CRASHED_PRIMARY, &device->flags) ? 2 : 0; |
| uuid_flags |= device->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0; |
| p->uuid[UI_FLAGS] = cpu_to_be64(uuid_flags); |
| |
| put_ldev(device); |
| return drbd_send_command(peer_device, sock, P_UUIDS, sizeof(*p), NULL, 0); |
| } |
| |
| int drbd_send_uuids(struct drbd_peer_device *peer_device) |
| { |
| return _drbd_send_uuids(peer_device, 0); |
| } |
| |
| int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *peer_device) |
| { |
| return _drbd_send_uuids(peer_device, 8); |
| } |
| |
| void drbd_print_uuids(struct drbd_device *device, const char *text) |
| { |
| if (get_ldev_if_state(device, D_NEGOTIATING)) { |
| u64 *uuid = device->ldev->md.uuid; |
| drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX\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]); |
| put_ldev(device); |
| } else { |
| drbd_info(device, "%s effective data uuid: %016llX\n", |
| text, |
| (unsigned long long)device->ed_uuid); |
| } |
| } |
| |
| void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *peer_device) |
| { |
| struct drbd_device *device = peer_device->device; |
| struct drbd_socket *sock; |
| struct p_rs_uuid *p; |
| u64 uuid; |
| |
| D_ASSERT(device, device->state.disk == D_UP_TO_DATE); |
| |
| uuid = device->ldev->md.uuid[UI_BITMAP]; |
| if (uuid && uuid != UUID_JUST_CREATED) |
| uuid = uuid + UUID_NEW_BM_OFFSET; |
| else |
| get_random_bytes(&uuid, sizeof(u64)); |
| drbd_uuid_set(device, UI_BITMAP, uuid); |
| drbd_print_uuids(device, "updated sync UUID"); |
| drbd_md_sync(device); |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (p) { |
| p->uuid = cpu_to_be64(uuid); |
| drbd_send_command(peer_device, sock, P_SYNC_UUID, sizeof(*p), NULL, 0); |
| } |
| } |
| |
| int drbd_send_sizes(struct drbd_peer_device *peer_device, int trigger_reply, enum dds_flags flags) |
| { |
| struct drbd_device *device = peer_device->device; |
| struct drbd_socket *sock; |
| struct p_sizes *p; |
| sector_t d_size, u_size; |
| int q_order_type; |
| unsigned int max_bio_size; |
| unsigned int packet_size; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) |
| return -EIO; |
| |
| packet_size = sizeof(*p); |
| if (peer_device->connection->agreed_features & DRBD_FF_WSAME) |
| packet_size += sizeof(p->qlim[0]); |
| |
| memset(p, 0, packet_size); |
| if (get_ldev_if_state(device, D_NEGOTIATING)) { |
| struct block_device *bdev = device->ldev->backing_bdev; |
| struct request_queue *q = bdev_get_queue(bdev); |
| |
| d_size = drbd_get_max_capacity(device->ldev); |
| rcu_read_lock(); |
| u_size = rcu_dereference(device->ldev->disk_conf)->disk_size; |
| rcu_read_unlock(); |
| q_order_type = drbd_queue_order_type(device); |
| max_bio_size = queue_max_hw_sectors(q) << 9; |
| max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE); |
| p->qlim->physical_block_size = |
| cpu_to_be32(bdev_physical_block_size(bdev)); |
| p->qlim->logical_block_size = |
| cpu_to_be32(bdev_logical_block_size(bdev)); |
| p->qlim->alignment_offset = |
| cpu_to_be32(bdev_alignment_offset(bdev)); |
| p->qlim->io_min = cpu_to_be32(bdev_io_min(bdev)); |
| p->qlim->io_opt = cpu_to_be32(bdev_io_opt(bdev)); |
| p->qlim->discard_enabled = !!bdev_max_discard_sectors(bdev); |
| put_ldev(device); |
| } else { |
| struct request_queue *q = device->rq_queue; |
| |
| p->qlim->physical_block_size = |
| cpu_to_be32(queue_physical_block_size(q)); |
| p->qlim->logical_block_size = |
| cpu_to_be32(queue_logical_block_size(q)); |
| p->qlim->alignment_offset = 0; |
| p->qlim->io_min = cpu_to_be32(queue_io_min(q)); |
| p->qlim->io_opt = cpu_to_be32(queue_io_opt(q)); |
| p->qlim->discard_enabled = 0; |
| |
| d_size = 0; |
| u_size = 0; |
| q_order_type = QUEUE_ORDERED_NONE; |
| max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */ |
| } |
| |
| if (peer_device->connection->agreed_pro_version <= 94) |
| max_bio_size = min(max_bio_size, DRBD_MAX_SIZE_H80_PACKET); |
| else if (peer_device->connection->agreed_pro_version < 100) |
| max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE_P95); |
| |
| p->d_size = cpu_to_be64(d_size); |
| p->u_size = cpu_to_be64(u_size); |
| if (trigger_reply) |
| p->c_size = 0; |
| else |
| p->c_size = cpu_to_be64(get_capacity(device->vdisk)); |
| p->max_bio_size = cpu_to_be32(max_bio_size); |
| p->queue_order_type = cpu_to_be16(q_order_type); |
| p->dds_flags = cpu_to_be16(flags); |
| |
| return drbd_send_command(peer_device, sock, P_SIZES, packet_size, NULL, 0); |
| } |
| |
| /** |
| * drbd_send_current_state() - Sends the drbd state to the peer |
| * @peer_device: DRBD peer device. |
| */ |
| int drbd_send_current_state(struct drbd_peer_device *peer_device) |
| { |
| struct drbd_socket *sock; |
| struct p_state *p; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) |
| return -EIO; |
| p->state = cpu_to_be32(peer_device->device->state.i); /* Within the send mutex */ |
| return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0); |
| } |
| |
| /** |
| * drbd_send_state() - After a state change, sends the new state to the peer |
| * @peer_device: DRBD peer device. |
| * @state: the state to send, not necessarily the current state. |
| * |
| * Each state change queues an "after_state_ch" work, which will eventually |
| * send the resulting new state to the peer. If more state changes happen |
| * between queuing and processing of the after_state_ch work, we still |
| * want to send each intermediary state in the order it occurred. |
| */ |
| int drbd_send_state(struct drbd_peer_device *peer_device, union drbd_state state) |
| { |
| struct drbd_socket *sock; |
| struct p_state *p; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) |
| return -EIO; |
| p->state = cpu_to_be32(state.i); /* Within the send mutex */ |
| return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0); |
| } |
| |
| int drbd_send_state_req(struct drbd_peer_device *peer_device, union drbd_state mask, union drbd_state val) |
| { |
| struct drbd_socket *sock; |
| struct p_req_state *p; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) |
| return -EIO; |
| p->mask = cpu_to_be32(mask.i); |
| p->val = cpu_to_be32(val.i); |
| return drbd_send_command(peer_device, sock, P_STATE_CHG_REQ, sizeof(*p), NULL, 0); |
| } |
| |
| int conn_send_state_req(struct drbd_connection *connection, union drbd_state mask, union drbd_state val) |
| { |
| enum drbd_packet cmd; |
| struct drbd_socket *sock; |
| struct p_req_state *p; |
| |
| cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REQ : P_CONN_ST_CHG_REQ; |
| sock = &connection->data; |
| p = conn_prepare_command(connection, sock); |
| if (!p) |
| return -EIO; |
| p->mask = cpu_to_be32(mask.i); |
| p->val = cpu_to_be32(val.i); |
| return conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0); |
| } |
| |
| void drbd_send_sr_reply(struct drbd_peer_device *peer_device, enum drbd_state_rv retcode) |
| { |
| struct drbd_socket *sock; |
| struct p_req_state_reply *p; |
| |
| sock = &peer_device->connection->meta; |
| p = drbd_prepare_command(peer_device, sock); |
| if (p) { |
| p->retcode = cpu_to_be32(retcode); |
| drbd_send_command(peer_device, sock, P_STATE_CHG_REPLY, sizeof(*p), NULL, 0); |
| } |
| } |
| |
| void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode) |
| { |
| struct drbd_socket *sock; |
| struct p_req_state_reply *p; |
| enum drbd_packet cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY; |
| |
| sock = &connection->meta; |
| p = conn_prepare_command(connection, sock); |
| if (p) { |
| p->retcode = cpu_to_be32(retcode); |
| conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0); |
| } |
| } |
| |
| static void dcbp_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code) |
| { |
| BUG_ON(code & ~0xf); |
| p->encoding = (p->encoding & ~0xf) | code; |
| } |
| |
| static void dcbp_set_start(struct p_compressed_bm *p, int set) |
| { |
| p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0); |
| } |
| |
| static void dcbp_set_pad_bits(struct p_compressed_bm *p, int n) |
| { |
| BUG_ON(n & ~0x7); |
| p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4); |
| } |
| |
| static int fill_bitmap_rle_bits(struct drbd_device *device, |
| struct p_compressed_bm *p, |
| unsigned int size, |
| struct bm_xfer_ctx *c) |
| { |
| struct bitstream bs; |
| unsigned long plain_bits; |
| unsigned long tmp; |
| unsigned long rl; |
| unsigned len; |
| unsigned toggle; |
| int bits, use_rle; |
| |
| /* may we use this feature? */ |
| rcu_read_lock(); |
| use_rle = rcu_dereference(first_peer_device(device)->connection->net_conf)->use_rle; |
| rcu_read_unlock(); |
| if (!use_rle || first_peer_device(device)->connection->agreed_pro_version < 90) |
| return 0; |
| |
| if (c->bit_offset >= c->bm_bits) |
| return 0; /* nothing to do. */ |
| |
| /* use at most thus many bytes */ |
| bitstream_init(&bs, p->code, size, 0); |
| memset(p->code, 0, size); |
| /* plain bits covered in this code string */ |
| plain_bits = 0; |
| |
| /* p->encoding & 0x80 stores whether the first run length is set. |
| * bit offset is implicit. |
| * start with toggle == 2 to be able to tell the first iteration */ |
| toggle = 2; |
| |
| /* see how much plain bits we can stuff into one packet |
| * using RLE and VLI. */ |
| do { |
| tmp = (toggle == 0) ? _drbd_bm_find_next_zero(device, c->bit_offset) |
| : _drbd_bm_find_next(device, c->bit_offset); |
| if (tmp == -1UL) |
| tmp = c->bm_bits; |
| rl = tmp - c->bit_offset; |
| |
| if (toggle == 2) { /* first iteration */ |
| if (rl == 0) { |
| /* the first checked bit was set, |
| * store start value, */ |
| dcbp_set_start(p, 1); |
| /* but skip encoding of zero run length */ |
| toggle = !toggle; |
| continue; |
| } |
| dcbp_set_start(p, 0); |
| } |
| |
| /* paranoia: catch zero runlength. |
| * can only happen if bitmap is modified while we scan it. */ |
| if (rl == 0) { |
| drbd_err(device, "unexpected zero runlength while encoding bitmap " |
| "t:%u bo:%lu\n", toggle, c->bit_offset); |
| return -1; |
| } |
| |
| bits = vli_encode_bits(&bs, rl); |
| if (bits == -ENOBUFS) /* buffer full */ |
| break; |
| if (bits <= 0) { |
| drbd_err(device, "error while encoding bitmap: %d\n", bits); |
| return 0; |
| } |
| |
| toggle = !toggle; |
| plain_bits += rl; |
| c->bit_offset = tmp; |
| } while (c->bit_offset < c->bm_bits); |
| |
| len = bs.cur.b - p->code + !!bs.cur.bit; |
| |
| if (plain_bits < (len << 3)) { |
| /* incompressible with this method. |
| * we need to rewind both word and bit position. */ |
| c->bit_offset -= plain_bits; |
| bm_xfer_ctx_bit_to_word_offset(c); |
| c->bit_offset = c->word_offset * BITS_PER_LONG; |
| return 0; |
| } |
| |
| /* RLE + VLI was able to compress it just fine. |
| * update c->word_offset. */ |
| bm_xfer_ctx_bit_to_word_offset(c); |
| |
| /* store pad_bits */ |
| dcbp_set_pad_bits(p, (8 - bs.cur.bit) & 0x7); |
| |
| return len; |
| } |
| |
| /* |
| * send_bitmap_rle_or_plain |
| * |
| * Return 0 when done, 1 when another iteration is needed, and a negative error |
| * code upon failure. |
| */ |
| static int |
| send_bitmap_rle_or_plain(struct drbd_peer_device *peer_device, struct bm_xfer_ctx *c) |
| { |
| struct drbd_device *device = peer_device->device; |
| struct drbd_socket *sock = &peer_device->connection->data; |
| unsigned int header_size = drbd_header_size(peer_device->connection); |
| struct p_compressed_bm *p = sock->sbuf + header_size; |
| int len, err; |
| |
| len = fill_bitmap_rle_bits(device, p, |
| DRBD_SOCKET_BUFFER_SIZE - header_size - sizeof(*p), c); |
| if (len < 0) |
| return -EIO; |
| |
| if (len) { |
| dcbp_set_code(p, RLE_VLI_Bits); |
| err = __send_command(peer_device->connection, device->vnr, sock, |
| P_COMPRESSED_BITMAP, sizeof(*p) + len, |
| NULL, 0); |
| c->packets[0]++; |
| c->bytes[0] += header_size + sizeof(*p) + len; |
| |
| if (c->bit_offset >= c->bm_bits) |
| len = 0; /* DONE */ |
| } else { |
| /* was not compressible. |
| * send a buffer full of plain text bits instead. */ |
| unsigned int data_size; |
| unsigned long num_words; |
| unsigned long *p = sock->sbuf + header_size; |
| |
| data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; |
| num_words = min_t(size_t, data_size / sizeof(*p), |
| c->bm_words - c->word_offset); |
| len = num_words * sizeof(*p); |
| if (len) |
| drbd_bm_get_lel(device, c->word_offset, num_words, p); |
| err = __send_command(peer_device->connection, device->vnr, sock, P_BITMAP, |
| len, NULL, 0); |
| c->word_offset += num_words; |
| c->bit_offset = c->word_offset * BITS_PER_LONG; |
| |
| c->packets[1]++; |
| c->bytes[1] += header_size + len; |
| |
| if (c->bit_offset > c->bm_bits) |
| c->bit_offset = c->bm_bits; |
| } |
| if (!err) { |
| if (len == 0) { |
| INFO_bm_xfer_stats(peer_device, "send", c); |
| return 0; |
| } else |
| return 1; |
| } |
| return -EIO; |
| } |
| |
| /* See the comment at receive_bitmap() */ |
| static int _drbd_send_bitmap(struct drbd_device *device, |
| struct drbd_peer_device *peer_device) |
| { |
| struct bm_xfer_ctx c; |
| int err; |
| |
| if (!expect(device, device->bitmap)) |
| return false; |
| |
| if (get_ldev(device)) { |
| if (drbd_md_test_flag(device->ldev, MDF_FULL_SYNC)) { |
| drbd_info(device, "Writing the whole bitmap, MDF_FullSync was set.\n"); |
| drbd_bm_set_all(device); |
| if (drbd_bm_write(device, peer_device)) { |
| /* write_bm did fail! Leave full sync flag set in Meta P_DATA |
| * but otherwise process as per normal - need to tell other |
| * side that a full resync is required! */ |
| drbd_err(device, "Failed to write bitmap to disk!\n"); |
| } else { |
| drbd_md_clear_flag(device, MDF_FULL_SYNC); |
| drbd_md_sync(device); |
| } |
| } |
| put_ldev(device); |
| } |
| |
| c = (struct bm_xfer_ctx) { |
| .bm_bits = drbd_bm_bits(device), |
| .bm_words = drbd_bm_words(device), |
| }; |
| |
| do { |
| err = send_bitmap_rle_or_plain(peer_device, &c); |
| } while (err > 0); |
| |
| return err == 0; |
| } |
| |
| int drbd_send_bitmap(struct drbd_device *device, struct drbd_peer_device *peer_device) |
| { |
| struct drbd_socket *sock = &peer_device->connection->data; |
| int err = -1; |
| |
| mutex_lock(&sock->mutex); |
| if (sock->socket) |
| err = !_drbd_send_bitmap(device, peer_device); |
| mutex_unlock(&sock->mutex); |
| return err; |
| } |
| |
| void drbd_send_b_ack(struct drbd_connection *connection, u32 barrier_nr, u32 set_size) |
| { |
| struct drbd_socket *sock; |
| struct p_barrier_ack *p; |
| |
| if (connection->cstate < C_WF_REPORT_PARAMS) |
| return; |
| |
| sock = &connection->meta; |
| p = conn_prepare_command(connection, sock); |
| if (!p) |
| return; |
| p->barrier = barrier_nr; |
| p->set_size = cpu_to_be32(set_size); |
| conn_send_command(connection, sock, P_BARRIER_ACK, sizeof(*p), NULL, 0); |
| } |
| |
| /** |
| * _drbd_send_ack() - Sends an ack packet |
| * @peer_device: DRBD peer device. |
| * @cmd: Packet command code. |
| * @sector: sector, needs to be in big endian byte order |
| * @blksize: size in byte, needs to be in big endian byte order |
| * @block_id: Id, big endian byte order |
| */ |
| static int _drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
| u64 sector, u32 blksize, u64 block_id) |
| { |
| struct drbd_socket *sock; |
| struct p_block_ack *p; |
| |
| if (peer_device->device->state.conn < C_CONNECTED) |
| return -EIO; |
| |
| sock = &peer_device->connection->meta; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) |
| return -EIO; |
| p->sector = sector; |
| p->block_id = block_id; |
| p->blksize = blksize; |
| p->seq_num = cpu_to_be32(atomic_inc_return(&peer_device->device->packet_seq)); |
| return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0); |
| } |
| |
| /* dp->sector and dp->block_id already/still in network byte order, |
| * data_size is payload size according to dp->head, |
| * and may need to be corrected for digest size. */ |
| void drbd_send_ack_dp(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
| struct p_data *dp, int data_size) |
| { |
| if (peer_device->connection->peer_integrity_tfm) |
| data_size -= crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm); |
| _drbd_send_ack(peer_device, cmd, dp->sector, cpu_to_be32(data_size), |
| dp->block_id); |
| } |
| |
| void drbd_send_ack_rp(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
| struct p_block_req *rp) |
| { |
| _drbd_send_ack(peer_device, cmd, rp->sector, rp->blksize, rp->block_id); |
| } |
| |
| /** |
| * drbd_send_ack() - Sends an ack packet |
| * @peer_device: DRBD peer device |
| * @cmd: packet command code |
| * @peer_req: peer request |
| */ |
| int drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
| struct drbd_peer_request *peer_req) |
| { |
| return _drbd_send_ack(peer_device, cmd, |
| cpu_to_be64(peer_req->i.sector), |
| cpu_to_be32(peer_req->i.size), |
| peer_req->block_id); |
| } |
| |
| /* This function misuses the block_id field to signal if the blocks |
| * are is sync or not. */ |
| int drbd_send_ack_ex(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
| sector_t sector, int blksize, u64 block_id) |
| { |
| return _drbd_send_ack(peer_device, cmd, |
| cpu_to_be64(sector), |
| cpu_to_be32(blksize), |
| cpu_to_be64(block_id)); |
| } |
| |
| int drbd_send_rs_deallocated(struct drbd_peer_device *peer_device, |
| struct drbd_peer_request *peer_req) |
| { |
| struct drbd_socket *sock; |
| struct p_block_desc *p; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) |
| return -EIO; |
| p->sector = cpu_to_be64(peer_req->i.sector); |
| p->blksize = cpu_to_be32(peer_req->i.size); |
| p->pad = 0; |
| return drbd_send_command(peer_device, sock, P_RS_DEALLOCATED, sizeof(*p), NULL, 0); |
| } |
| |
| int drbd_send_drequest(struct drbd_peer_device *peer_device, int cmd, |
| sector_t sector, int size, u64 block_id) |
| { |
| struct drbd_socket *sock; |
| struct p_block_req *p; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) |
| return -EIO; |
| p->sector = cpu_to_be64(sector); |
| p->block_id = block_id; |
| p->blksize = cpu_to_be32(size); |
| return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0); |
| } |
| |
| int drbd_send_drequest_csum(struct drbd_peer_device *peer_device, sector_t sector, int size, |
| void *digest, int digest_size, enum drbd_packet cmd) |
| { |
| struct drbd_socket *sock; |
| struct p_block_req *p; |
| |
| /* FIXME: Put the digest into the preallocated socket buffer. */ |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) |
| return -EIO; |
| p->sector = cpu_to_be64(sector); |
| p->block_id = ID_SYNCER /* unused */; |
| p->blksize = cpu_to_be32(size); |
| return drbd_send_command(peer_device, sock, cmd, sizeof(*p), digest, digest_size); |
| } |
| |
| int drbd_send_ov_request(struct drbd_peer_device *peer_device, sector_t sector, int size) |
| { |
| struct drbd_socket *sock; |
| struct p_block_req *p; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) |
| return -EIO; |
| p->sector = cpu_to_be64(sector); |
| p->block_id = ID_SYNCER /* unused */; |
| p->blksize = cpu_to_be32(size); |
| return drbd_send_command(peer_device, sock, P_OV_REQUEST, sizeof(*p), NULL, 0); |
| } |
| |
| /* called on sndtimeo |
| * returns false if we should retry, |
| * true if we think connection is dead |
| */ |
| static int we_should_drop_the_connection(struct drbd_connection *connection, struct socket *sock) |
| { |
| int drop_it; |
| /* long elapsed = (long)(jiffies - device->last_received); */ |
| |
| drop_it = connection->meta.socket == sock |
| || !connection->ack_receiver.task |
| || get_t_state(&connection->ack_receiver) != RUNNING |
| || connection->cstate < C_WF_REPORT_PARAMS; |
| |
| if (drop_it) |
| return true; |
| |
| drop_it = !--connection->ko_count; |
| if (!drop_it) { |
| drbd_err(connection, "[%s/%d] sock_sendmsg time expired, ko = %u\n", |
| current->comm, current->pid, connection->ko_count); |
| request_ping(connection); |
| } |
| |
| return drop_it; /* && (device->state == R_PRIMARY) */; |
| } |
| |
| static void drbd_update_congested(struct drbd_connection *connection) |
| { |
| struct sock *sk = connection->data.socket->sk; |
| if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5) |
| set_bit(NET_CONGESTED, &connection->flags); |
| } |
| |
| /* The idea of sendpage seems to be to put some kind of reference |
| * to the page into the skb, and to hand it over to the NIC. In |
| * this process get_page() gets called. |
| * |
| * As soon as the page was really sent over the network put_page() |
| * gets called by some part of the network layer. [ NIC driver? ] |
| * |
| * [ get_page() / put_page() increment/decrement the count. If count |
| * reaches 0 the page will be freed. ] |
| * |
| * This works nicely with pages from FSs. |
| * But this means that in protocol A we might signal IO completion too early! |
| * |
| * In order not to corrupt data during a resync we must make sure |
| * that we do not reuse our own buffer pages (EEs) to early, therefore |
| * we have the net_ee list. |
| * |
| * XFS seems to have problems, still, it submits pages with page_count == 0! |
| * As a workaround, we disable sendpage on pages |
| * with page_count == 0 or PageSlab. |
| */ |
| static int _drbd_no_send_page(struct drbd_peer_device *peer_device, struct page *page, |
| int offset, size_t size, unsigned msg_flags) |
| { |
| struct socket *socket; |
| void *addr; |
| int err; |
| |
| socket = peer_device->connection->data.socket; |
| addr = kmap(page) + offset; |
| err = drbd_send_all(peer_device->connection, socket, addr, size, msg_flags); |
| kunmap(page); |
| if (!err) |
| peer_device->device->send_cnt += size >> 9; |
| return err; |
| } |
| |
| static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *page, |
| int offset, size_t size, unsigned msg_flags) |
| { |
| struct socket *socket = peer_device->connection->data.socket; |
| struct msghdr msg = { .msg_flags = msg_flags, }; |
| struct bio_vec bvec; |
| int len = size; |
| int err = -EIO; |
| |
| /* e.g. XFS meta- & log-data is in slab pages, which have a |
| * page_count of 0 and/or have PageSlab() set. |
| * we cannot use send_page for those, as that does get_page(); |
| * put_page(); and would cause either a VM_BUG directly, or |
| * __page_cache_release a page that would actually still be referenced |
| * by someone, leading to some obscure delayed Oops somewhere else. */ |
| if (!drbd_disable_sendpage && sendpages_ok(page, len, offset)) |
| msg.msg_flags |= MSG_NOSIGNAL | MSG_SPLICE_PAGES; |
| |
| drbd_update_congested(peer_device->connection); |
| do { |
| int sent; |
| |
| bvec_set_page(&bvec, page, len, offset); |
| iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, len); |
| |
| sent = sock_sendmsg(socket, &msg); |
| if (sent <= 0) { |
| if (sent == -EAGAIN) { |
| if (we_should_drop_the_connection(peer_device->connection, socket)) |
| break; |
| continue; |
| } |
| drbd_warn(peer_device->device, "%s: size=%d len=%d sent=%d\n", |
| __func__, (int)size, len, sent); |
| if (sent < 0) |
| err = sent; |
| break; |
| } |
| len -= sent; |
| offset += sent; |
| } while (len > 0 /* THINK && device->cstate >= C_CONNECTED*/); |
| clear_bit(NET_CONGESTED, &peer_device->connection->flags); |
| |
| if (len == 0) { |
| err = 0; |
| peer_device->device->send_cnt += size >> 9; |
| } |
| return err; |
| } |
| |
| static int _drbd_send_bio(struct drbd_peer_device *peer_device, struct bio *bio) |
| { |
| struct bio_vec bvec; |
| struct bvec_iter iter; |
| |
| /* hint all but last page with MSG_MORE */ |
| bio_for_each_segment(bvec, bio, iter) { |
| int err; |
| |
| err = _drbd_no_send_page(peer_device, bvec.bv_page, |
| bvec.bv_offset, bvec.bv_len, |
| bio_iter_last(bvec, iter) |
| ? 0 : MSG_MORE); |
| if (err) |
| return err; |
| } |
| return 0; |
| } |
| |
| static int _drbd_send_zc_bio(struct drbd_peer_device *peer_device, struct bio *bio) |
| { |
| struct bio_vec bvec; |
| struct bvec_iter iter; |
| |
| /* hint all but last page with MSG_MORE */ |
| bio_for_each_segment(bvec, bio, iter) { |
| int err; |
| |
| err = _drbd_send_page(peer_device, bvec.bv_page, |
| bvec.bv_offset, bvec.bv_len, |
| bio_iter_last(bvec, iter) ? 0 : MSG_MORE); |
| if (err) |
| return err; |
| } |
| return 0; |
| } |
| |
| static int _drbd_send_zc_ee(struct drbd_peer_device *peer_device, |
| struct drbd_peer_request *peer_req) |
| { |
| struct page *page = peer_req->pages; |
| unsigned len = peer_req->i.size; |
| int err; |
| |
| /* hint all but last page with MSG_MORE */ |
| page_chain_for_each(page) { |
| unsigned l = min_t(unsigned, len, PAGE_SIZE); |
| |
| err = _drbd_send_page(peer_device, page, 0, l, |
| page_chain_next(page) ? MSG_MORE : 0); |
| if (err) |
| return err; |
| len -= l; |
| } |
| return 0; |
| } |
| |
| static u32 bio_flags_to_wire(struct drbd_connection *connection, |
| struct bio *bio) |
| { |
| if (connection->agreed_pro_version >= 95) |
| return (bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0) | |
| (bio->bi_opf & REQ_FUA ? DP_FUA : 0) | |
| (bio->bi_opf & REQ_PREFLUSH ? DP_FLUSH : 0) | |
| (bio_op(bio) == REQ_OP_DISCARD ? DP_DISCARD : 0) | |
| (bio_op(bio) == REQ_OP_WRITE_ZEROES ? |
| ((connection->agreed_features & DRBD_FF_WZEROES) ? |
| (DP_ZEROES |(!(bio->bi_opf & REQ_NOUNMAP) ? DP_DISCARD : 0)) |
| : DP_DISCARD) |
| : 0); |
| else |
| return bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0; |
| } |
| |
| /* Used to send write or TRIM aka REQ_OP_DISCARD requests |
| * R_PRIMARY -> Peer (P_DATA, P_TRIM) |
| */ |
| int drbd_send_dblock(struct drbd_peer_device *peer_device, struct drbd_request *req) |
| { |
| struct drbd_device *device = peer_device->device; |
| struct drbd_socket *sock; |
| struct p_data *p; |
| void *digest_out; |
| unsigned int dp_flags = 0; |
| int digest_size; |
| int err; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| digest_size = peer_device->connection->integrity_tfm ? |
| crypto_shash_digestsize(peer_device->connection->integrity_tfm) : 0; |
| |
| if (!p) |
| return -EIO; |
| p->sector = cpu_to_be64(req->i.sector); |
| p->block_id = (unsigned long)req; |
| p->seq_num = cpu_to_be32(atomic_inc_return(&device->packet_seq)); |
| dp_flags = bio_flags_to_wire(peer_device->connection, req->master_bio); |
| if (device->state.conn >= C_SYNC_SOURCE && |
| device->state.conn <= C_PAUSED_SYNC_T) |
| dp_flags |= DP_MAY_SET_IN_SYNC; |
| if (peer_device->connection->agreed_pro_version >= 100) { |
| if (req->rq_state & RQ_EXP_RECEIVE_ACK) |
| dp_flags |= DP_SEND_RECEIVE_ACK; |
| /* During resync, request an explicit write ack, |
| * even in protocol != C */ |
| if (req->rq_state & RQ_EXP_WRITE_ACK |
| || (dp_flags & DP_MAY_SET_IN_SYNC)) |
| dp_flags |= DP_SEND_WRITE_ACK; |
| } |
| p->dp_flags = cpu_to_be32(dp_flags); |
| |
| if (dp_flags & (DP_DISCARD|DP_ZEROES)) { |
| enum drbd_packet cmd = (dp_flags & DP_ZEROES) ? P_ZEROES : P_TRIM; |
| struct p_trim *t = (struct p_trim*)p; |
| t->size = cpu_to_be32(req->i.size); |
| err = __send_command(peer_device->connection, device->vnr, sock, cmd, sizeof(*t), NULL, 0); |
| goto out; |
| } |
| digest_out = p + 1; |
| |
| /* our digest is still only over the payload. |
| * TRIM does not carry any payload. */ |
| if (digest_size) |
| drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest_out); |
| err = __send_command(peer_device->connection, device->vnr, sock, P_DATA, |
| sizeof(*p) + digest_size, NULL, req->i.size); |
| if (!err) { |
| /* For protocol A, we have to memcpy the payload into |
| * socket buffers, as we may complete right away |
| * as soon as we handed it over to tcp, at which point the data |
| * pages may become invalid. |
| * |
| * For data-integrity enabled, we copy it as well, so we can be |
| * sure that even if the bio pages may still be modified, it |
| * won't change the data on the wire, thus if the digest checks |
| * out ok after sending on this side, but does not fit on the |
| * receiving side, we sure have detected corruption elsewhere. |
| */ |
| if (!(req->rq_state & (RQ_EXP_RECEIVE_ACK | RQ_EXP_WRITE_ACK)) || digest_size) |
| err = _drbd_send_bio(peer_device, req->master_bio); |
| else |
| err = _drbd_send_zc_bio(peer_device, req->master_bio); |
| |
| /* double check digest, sometimes buffers have been modified in flight. */ |
| if (digest_size > 0 && digest_size <= 64) { |
| /* 64 byte, 512 bit, is the largest digest size |
| * currently supported in kernel crypto. */ |
| unsigned char digest[64]; |
| drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest); |
| if (memcmp(p + 1, digest, digest_size)) { |
| drbd_warn(device, |
| "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n", |
| (unsigned long long)req->i.sector, req->i.size); |
| } |
| } /* else if (digest_size > 64) { |
| ... Be noisy about digest too large ... |
| } */ |
| } |
| out: |
| mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */ |
| |
| return err; |
| } |
| |
| /* answer packet, used to send data back for read requests: |
| * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY) |
| * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY) |
| */ |
| int drbd_send_block(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
| struct drbd_peer_request *peer_req) |
| { |
| struct drbd_device *device = peer_device->device; |
| struct drbd_socket *sock; |
| struct p_data *p; |
| int err; |
| int digest_size; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| |
| digest_size = peer_device->connection->integrity_tfm ? |
| crypto_shash_digestsize(peer_device->connection->integrity_tfm) : 0; |
| |
| if (!p) |
| return -EIO; |
| p->sector = cpu_to_be64(peer_req->i.sector); |
| p->block_id = peer_req->block_id; |
| p->seq_num = 0; /* unused */ |
| p->dp_flags = 0; |
| if (digest_size) |
| drbd_csum_ee(peer_device->connection->integrity_tfm, peer_req, p + 1); |
| err = __send_command(peer_device->connection, device->vnr, sock, cmd, sizeof(*p) + digest_size, NULL, peer_req->i.size); |
| if (!err) |
| err = _drbd_send_zc_ee(peer_device, peer_req); |
| mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */ |
| |
| return err; |
| } |
| |
| int drbd_send_out_of_sync(struct drbd_peer_device *peer_device, struct drbd_request *req) |
| { |
| struct drbd_socket *sock; |
| struct p_block_desc *p; |
| |
| sock = &peer_device->connection->data; |
| p = drbd_prepare_command(peer_device, sock); |
| if (!p) |
| return -EIO; |
| p->sector = cpu_to_be64(req->i.sector); |
| p->blksize = cpu_to_be32(req->i.size); |
| return drbd_send_command(peer_device, sock, P_OUT_OF_SYNC, sizeof(*p), NULL, 0); |
| } |
| |
| /* |
| drbd_send distinguishes two cases: |
| |
| Packets sent via the data socket "sock" |
| and packets sent via the meta data socket "msock" |
| |
| sock msock |
| -----------------+-------------------------+------------------------------ |
| timeout conf.timeout / 2 conf.timeout / 2 |
| timeout action send a ping via msock Abort communication |
| and close all sockets |
| */ |
| |
| /* |
| * you must have down()ed the appropriate [m]sock_mutex elsewhere! |
| */ |
| int drbd_send(struct drbd_connection *connection, struct socket *sock, |
| void *buf, size_t size, unsigned msg_flags) |
| { |
| struct kvec iov = {.iov_base = buf, .iov_len = size}; |
| struct msghdr msg = {.msg_flags = msg_flags | MSG_NOSIGNAL}; |
| int rv, sent = 0; |
| |
| if (!sock) |
| return -EBADR; |
| |
| /* THINK if (signal_pending) return ... ? */ |
| |
| iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &iov, 1, size); |
| |
| if (sock == connection->data.socket) { |
| rcu_read_lock(); |
| connection->ko_count = rcu_dereference(connection->net_conf)->ko_count; |
| rcu_read_unlock(); |
| drbd_update_congested(connection); |
| } |
| do { |
| rv = sock_sendmsg(sock, &msg); |
| if (rv == -EAGAIN) { |
| if (we_should_drop_the_connection(connection, sock)) |
| break; |
| else |
| continue; |
| } |
| if (rv == -EINTR) { |
| flush_signals(current); |
| rv = 0; |
| } |
| if (rv < 0) |
| break; |
| sent += rv; |
| } while (sent < size); |
| |
| if (sock == connection->data.socket) |
| clear_bit(NET_CONGESTED, &connection->flags); |
| |
| if (rv <= 0) { |
| if (rv != -EAGAIN) { |
| drbd_err(connection, "%s_sendmsg returned %d\n", |
| sock == connection->meta.socket ? "msock" : "sock", |
| rv); |
| conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD); |
| } else |
| conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD); |
| } |
| |
| return sent; |
| } |
| |
| /* |
| * drbd_send_all - Send an entire buffer |
| * |
| * Returns 0 upon success and a negative error value otherwise. |
| */ |
| int drbd_send_all(struct drbd_connection *connection, struct socket *sock, void *buffer, |
| size_t size, unsigned msg_flags) |
| { |
| int err; |
| |
| err = drbd_send(connection, sock, buffer, size, msg_flags); |
| if (err < 0) |
| return err; |
| if (err != size) |
| return -EIO; |
| return 0; |
| } |
| |
| static int drbd_open(struct gendisk *disk, blk_mode_t mode) |
| { |
| struct drbd_device *device = disk->private_data; |
| unsigned long flags; |
| int rv = 0; |
| |
| mutex_lock(&drbd_main_mutex); |
| spin_lock_irqsave(&device->resource->req_lock, flags); |
| /* to have a stable device->state.role |
| * and no race with updating open_cnt */ |
| |
| if (device->state.role != R_PRIMARY) { |
| if (mode & BLK_OPEN_WRITE) |
| rv = -EROFS; |
| else if (!drbd_allow_oos) |
| rv = -EMEDIUMTYPE; |
| } |
| |
| if (!rv) |
| device->open_cnt++; |
| spin_unlock_irqrestore(&device->resource->req_lock, flags); |
| mutex_unlock(&drbd_main_mutex); |
| |
| return rv; |
| } |
| |
| static void drbd_release(struct gendisk *gd) |
| { |
| struct drbd_device *device = gd->private_data; |
| |
| mutex_lock(&drbd_main_mutex); |
| device->open_cnt--; |
| mutex_unlock(&drbd_main_mutex); |
| } |
| |
| /* need to hold resource->req_lock */ |
| void drbd_queue_unplug(struct drbd_device *device) |
| { |
| if (device->state.pdsk >= D_INCONSISTENT && device->state.conn >= C_CONNECTED) { |
| D_ASSERT(device, device->state.role == R_PRIMARY); |
| if (test_and_clear_bit(UNPLUG_REMOTE, &device->flags)) { |
| drbd_queue_work_if_unqueued( |
| &first_peer_device(device)->connection->sender_work, |
| &device->unplug_work); |
| } |
| } |
| } |
| |
| static void drbd_set_defaults(struct drbd_device *device) |
| { |
| /* Beware! The actual layout differs |
| * between big endian and little endian */ |
| device->state = (union drbd_dev_state) { |
| { .role = R_SECONDARY, |
| .peer = R_UNKNOWN, |
| .conn = C_STANDALONE, |
| .disk = D_DISKLESS, |
| .pdsk = D_UNKNOWN, |
| } }; |
| } |
| |
| void drbd_init_set_defaults(struct drbd_device *device) |
| { |
| /* the memset(,0,) did most of this. |
| * note: only assignments, no allocation in here */ |
| |
| drbd_set_defaults(device); |
| |
| atomic_set(&device->ap_bio_cnt, 0); |
| atomic_set(&device->ap_actlog_cnt, 0); |
| atomic_set(&device->ap_pending_cnt, 0); |
| atomic_set(&device->rs_pending_cnt, 0); |
| atomic_set(&device->unacked_cnt, 0); |
| atomic_set(&device->local_cnt, 0); |
| atomic_set(&device->pp_in_use_by_net, 0); |
| atomic_set(&device->rs_sect_in, 0); |
| atomic_set(&device->rs_sect_ev, 0); |
| atomic_set(&device->ap_in_flight, 0); |
| atomic_set(&device->md_io.in_use, 0); |
| |
| mutex_init(&device->own_state_mutex); |
| device->state_mutex = &device->own_state_mutex; |
| |
| spin_lock_init(&device->al_lock); |
| spin_lock_init(&device->peer_seq_lock); |
| |
| INIT_LIST_HEAD(&device->active_ee); |
| INIT_LIST_HEAD(&device->sync_ee); |
| INIT_LIST_HEAD(&device->done_ee); |
| INIT_LIST_HEAD(&device->read_ee); |
| INIT_LIST_HEAD(&device->net_ee); |
| INIT_LIST_HEAD(&device->resync_reads); |
| INIT_LIST_HEAD(&device->resync_work.list); |
| INIT_LIST_HEAD(&device->unplug_work.list); |
| INIT_LIST_HEAD(&device->bm_io_work.w.list); |
| INIT_LIST_HEAD(&device->pending_master_completion[0]); |
| INIT_LIST_HEAD(&device->pending_master_completion[1]); |
| INIT_LIST_HEAD(&device->pending_completion[0]); |
| INIT_LIST_HEAD(&device->pending_completion[1]); |
| |
| device->resync_work.cb = w_resync_timer; |
| device->unplug_work.cb = w_send_write_hint; |
| device->bm_io_work.w.cb = w_bitmap_io; |
| |
| timer_setup(&device->resync_timer, resync_timer_fn, 0); |
| timer_setup(&device->md_sync_timer, md_sync_timer_fn, 0); |
| timer_setup(&device->start_resync_timer, start_resync_timer_fn, 0); |
| timer_setup(&device->request_timer, request_timer_fn, 0); |
| |
| init_waitqueue_head(&device->misc_wait); |
| init_waitqueue_head(&device->state_wait); |
| init_waitqueue_head(&device->ee_wait); |
| init_waitqueue_head(&device->al_wait); |
| init_waitqueue_head(&device->seq_wait); |
| |
| device->resync_wenr = LC_FREE; |
| device->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE; |
| device->local_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE; |
| } |
| |
| void drbd_set_my_capacity(struct drbd_device *device, sector_t size) |
| { |
| char ppb[10]; |
| |
| set_capacity_and_notify(device->vdisk, size); |
| |
| drbd_info(device, "size = %s (%llu KB)\n", |
| ppsize(ppb, size>>1), (unsigned long long)size>>1); |
| } |
| |
| void drbd_device_cleanup(struct drbd_device *device) |
| { |
| int i; |
| if (first_peer_device(device)->connection->receiver.t_state != NONE) |
| drbd_err(device, "ASSERT FAILED: receiver t_state == %d expected 0.\n", |
| first_peer_device(device)->connection->receiver.t_state); |
| |
| device->al_writ_cnt = |
| device->bm_writ_cnt = |
| device->read_cnt = |
| device->recv_cnt = |
| device->send_cnt = |
| device->writ_cnt = |
| device->p_size = |
| device->rs_start = |
| device->rs_total = |
| device->rs_failed = 0; |
| device->rs_last_events = 0; |
| device->rs_last_sect_ev = 0; |
| for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
| device->rs_mark_left[i] = 0; |
| device->rs_mark_time[i] = 0; |
| } |
| D_ASSERT(device, first_peer_device(device)->connection->net_conf == NULL); |
| |
| set_capacity_and_notify(device->vdisk, 0); |
| if (device->bitmap) { |
| /* maybe never allocated. */ |
| drbd_bm_resize(device, 0, 1); |
| drbd_bm_cleanup(device); |
| } |
| |
| drbd_backing_dev_free(device, device->ldev); |
| device->ldev = NULL; |
| |
| clear_bit(AL_SUSPENDED, &device->flags); |
| |
| D_ASSERT(device, list_empty(&device->active_ee)); |
| D_ASSERT(device, list_empty(&device->sync_ee)); |
| D_ASSERT(device, list_empty(&device->done_ee)); |
| D_ASSERT(device, list_empty(&device->read_ee)); |
| D_ASSERT(device, list_empty(&device->net_ee)); |
| D_ASSERT(device, list_empty(&device->resync_reads)); |
| D_ASSERT(device, list_empty(&first_peer_device(device)->connection->sender_work.q)); |
| D_ASSERT(device, list_empty(&device->resync_work.list)); |
| D_ASSERT(device, list_empty(&device->unplug_work.list)); |
| |
| drbd_set_defaults(device); |
| } |
| |
| |
| static void drbd_destroy_mempools(void) |
| { |
| struct page *page; |
| |
| while (drbd_pp_pool) { |
| page = drbd_pp_pool; |
| drbd_pp_pool = (struct page *)page_private(page); |
| __free_page(page); |
| drbd_pp_vacant--; |
| } |
| |
| /* D_ASSERT(device, atomic_read(&drbd_pp_vacant)==0); */ |
| |
| bioset_exit(&drbd_io_bio_set); |
| bioset_exit(&drbd_md_io_bio_set); |
| mempool_exit(&drbd_md_io_page_pool); |
| mempool_exit(&drbd_ee_mempool); |
| mempool_exit(&drbd_request_mempool); |
| kmem_cache_destroy(drbd_ee_cache); |
| kmem_cache_destroy(drbd_request_cache); |
| kmem_cache_destroy(drbd_bm_ext_cache); |
| kmem_cache_destroy(drbd_al_ext_cache); |
| |
| drbd_ee_cache = NULL; |
| drbd_request_cache = NULL; |
| drbd_bm_ext_cache = NULL; |
| drbd_al_ext_cache = NULL; |
| |
| return; |
| } |
| |
| static int drbd_create_mempools(void) |
| { |
| struct page *page; |
| const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count; |
| int i, ret; |
| |
| /* caches */ |
| drbd_request_cache = kmem_cache_create( |
| "drbd_req", sizeof(struct drbd_request), 0, 0, NULL); |
| if (drbd_request_cache == NULL) |
| goto Enomem; |
| |
| drbd_ee_cache = kmem_cache_create( |
| "drbd_ee", sizeof(struct drbd_peer_request), 0, 0, NULL); |
| if (drbd_ee_cache == NULL) |
| goto Enomem; |
| |
| drbd_bm_ext_cache = kmem_cache_create( |
| "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL); |
| if (drbd_bm_ext_cache == NULL) |
| goto Enomem; |
| |
| drbd_al_ext_cache = kmem_cache_create( |
| "drbd_al", sizeof(struct lc_element), 0, 0, NULL); |
| if (drbd_al_ext_cache == NULL) |
| goto Enomem; |
| |
| /* mempools */ |
| ret = bioset_init(&drbd_io_bio_set, BIO_POOL_SIZE, 0, 0); |
| if (ret) |
| goto Enomem; |
| |
| ret = bioset_init(&drbd_md_io_bio_set, DRBD_MIN_POOL_PAGES, 0, |
| BIOSET_NEED_BVECS); |
| if (ret) |
| goto Enomem; |
| |
| ret = mempool_init_page_pool(&drbd_md_io_page_pool, DRBD_MIN_POOL_PAGES, 0); |
| if (ret) |
| goto Enomem; |
| |
| ret = mempool_init_slab_pool(&drbd_request_mempool, number, |
| drbd_request_cache); |
| if (ret) |
| goto Enomem; |
| |
| ret = mempool_init_slab_pool(&drbd_ee_mempool, number, drbd_ee_cache); |
| if (ret) |
| goto Enomem; |
| |
| for (i = 0; i < number; i++) { |
| page = alloc_page(GFP_HIGHUSER); |
| if (!page) |
| goto Enomem; |
| set_page_private(page, (unsigned long)drbd_pp_pool); |
| drbd_pp_pool = page; |
| } |
| drbd_pp_vacant = number; |
| |
| return 0; |
| |
| Enomem: |
| drbd_destroy_mempools(); /* in case we allocated some */ |
| return -ENOMEM; |
| } |
| |
| static void drbd_release_all_peer_reqs(struct drbd_device *device) |
| { |
| int rr; |
| |
| rr = drbd_free_peer_reqs(device, &device->active_ee); |
| if (rr) |
| drbd_err(device, "%d EEs in active list found!\n", rr); |
| |
| rr = drbd_free_peer_reqs(device, &device->sync_ee); |
| if (rr) |
| drbd_err(device, "%d EEs in sync list found!\n", rr); |
| |
| rr = drbd_free_peer_reqs(device, &device->read_ee); |
| if (rr) |
| drbd_err(device, "%d EEs in read list found!\n", rr); |
| |
| rr = drbd_free_peer_reqs(device, &device->done_ee); |
| if (rr) |
| drbd_err(device, "%d EEs in done list found!\n", rr); |
| |
| rr = drbd_free_peer_reqs(device, &device->net_ee); |
| if (rr) |
| drbd_err(device, "%d EEs in net list found!\n", rr); |
| } |
| |
| /* caution. no locking. */ |
| void drbd_destroy_device(struct kref *kref) |
| { |
| struct drbd_device *device = container_of(kref, struct drbd_device, kref); |
| struct drbd_resource *resource = device->resource; |
| struct drbd_peer_device *peer_device, *tmp_peer_device; |
| |
| timer_shutdown_sync(&device->request_timer); |
| |
| /* paranoia asserts */ |
| D_ASSERT(device, device->open_cnt == 0); |
| /* end paranoia asserts */ |
| |
| /* cleanup stuff that may have been allocated during |
| * device (re-)configuration or state changes */ |
| |
| drbd_backing_dev_free(device, device->ldev); |
| device->ldev = NULL; |
| |
| drbd_release_all_peer_reqs(device); |
| |
| lc_destroy(device->act_log); |
| lc_destroy(device->resync); |
| |
| kfree(device->p_uuid); |
| /* device->p_uuid = NULL; */ |
| |
| if (device->bitmap) /* should no longer be there. */ |
| drbd_bm_cleanup(device); |
| __free_page(device->md_io.page); |
| put_disk(device->vdisk); |
| kfree(device->rs_plan_s); |
| |
| /* not for_each_connection(connection, resource): |
| * those may have been cleaned up and disassociated already. |
| */ |
| for_each_peer_device_safe(peer_device, tmp_peer_device, device) { |
| kref_put(&peer_device->connection->kref, drbd_destroy_connection); |
| kfree(peer_device); |
| } |
| if (device->submit.wq) |
| destroy_workqueue(device->submit.wq); |
| kfree(device); |
| kref_put(&resource->kref, drbd_destroy_resource); |
| } |
| |
| /* One global retry thread, if we need to push back some bio and have it |
| * reinserted through our make request function. |
| */ |
| static struct retry_worker { |
| struct workqueue_struct *wq; |
| struct work_struct worker; |
| |
| spinlock_t lock; |
| struct list_head writes; |
| } retry; |
| |
| static void do_retry(struct work_struct *ws) |
| { |
| struct retry_worker *retry = container_of(ws, struct retry_worker, worker); |
| LIST_HEAD(writes); |
| struct drbd_request *req, *tmp; |
| |
| spin_lock_irq(&retry->lock); |
| list_splice_init(&retry->writes, &writes); |
| spin_unlock_irq(&retry->lock); |
| |
| list_for_each_entry_safe(req, tmp, &writes, tl_requests) { |
| struct drbd_device *device = req->device; |
| struct bio *bio = req->master_bio; |
| bool expected; |
| |
| expected = |
| expect(device, atomic_read(&req->completion_ref) == 0) && |
| expect(device, req->rq_state & RQ_POSTPONED) && |
| expect(device, (req->rq_state & RQ_LOCAL_PENDING) == 0 || |
| (req->rq_state & RQ_LOCAL_ABORTED) != 0); |
| |
| if (!expected) |
| drbd_err(device, "req=%p completion_ref=%d rq_state=%x\n", |
| req, atomic_read(&req->completion_ref), |
| req->rq_state); |
| |
| /* We still need to put one kref associated with the |
| * "completion_ref" going zero in the code path that queued it |
| * here. The request object may still be referenced by a |
| * frozen local req->private_bio, in case we force-detached. |
| */ |
| kref_put(&req->kref, drbd_req_destroy); |
| |
| /* A single suspended or otherwise blocking device may stall |
| * all others as well. Fortunately, this code path is to |
| * recover from a situation that "should not happen": |
| * concurrent writes in multi-primary setup. |
| * In a "normal" lifecycle, this workqueue is supposed to be |
| * destroyed without ever doing anything. |
| * If it turns out to be an issue anyways, we can do per |
| * resource (replication group) or per device (minor) retry |
| * workqueues instead. |
| */ |
| |
| /* We are not just doing submit_bio_noacct(), |
| * as we want to keep the start_time information. */ |
| inc_ap_bio(device); |
| __drbd_make_request(device, bio); |
| } |
| } |
| |
| /* called via drbd_req_put_completion_ref(), |
| * holds resource->req_lock */ |
| void drbd_restart_request(struct drbd_request *req) |
| { |
| unsigned long flags; |
| spin_lock_irqsave(&retry.lock, flags); |
| list_move_tail(&req->tl_requests, &retry.writes); |
| spin_unlock_irqrestore(&retry.lock, flags); |
| |
| /* Drop the extra reference that would otherwise |
| * have been dropped by complete_master_bio. |
| * do_retry() needs to grab a new one. */ |
| dec_ap_bio(req->device); |
| |
| queue_work(retry.wq, &retry.worker); |
| } |
| |
| void drbd_destroy_resource(struct kref *kref) |
| { |
| struct drbd_resource *resource = |
| container_of(kref, struct drbd_resource, kref); |
| |
| idr_destroy(&resource->devices); |
| free_cpumask_var(resource->cpu_mask); |
| kfree(resource->name); |
| kfree(resource); |
| } |
| |
| void drbd_free_resource(struct drbd_resource *resource) |
| { |
| struct drbd_connection *connection, *tmp; |
| |
| for_each_connection_safe(connection, tmp, resource) { |
| list_del(&connection->connections); |
| drbd_debugfs_connection_cleanup(connection); |
| kref_put(&connection->kref, drbd_destroy_connection); |
| } |
| drbd_debugfs_resource_cleanup(resource); |
| kref_put(&resource->kref, drbd_destroy_resource); |
| } |
| |
| static void drbd_cleanup(void) |
| { |
| unsigned int i; |
| struct drbd_device *device; |
| struct drbd_resource *resource, *tmp; |
| |
| /* first remove proc, |
| * drbdsetup uses it's presence to detect |
| * whether DRBD is loaded. |
| * If we would get stuck in proc removal, |
| * but have netlink already deregistered, |
| * some drbdsetup commands may wait forever |
| * for an answer. |
| */ |
| if (drbd_proc) |
| remove_proc_entry("drbd", NULL); |
| |
| if (retry.wq) |
| destroy_workqueue(retry.wq); |
| |
| drbd_genl_unregister(); |
| |
| idr_for_each_entry(&drbd_devices, device, i) |
| drbd_delete_device(device); |
| |
| /* not _rcu since, no other updater anymore. Genl already unregistered */ |
| for_each_resource_safe(resource, tmp, &drbd_resources) { |
| list_del(&resource->resources); |
| drbd_free_resource(resource); |
| } |
| |
| drbd_debugfs_cleanup(); |
| |
| drbd_destroy_mempools(); |
| unregister_blkdev(DRBD_MAJOR, "drbd"); |
| |
| idr_destroy(&drbd_devices); |
| |
| pr_info("module cleanup done.\n"); |
| } |
| |
| static void drbd_init_workqueue(struct drbd_work_queue* wq) |
| { |
| spin_lock_init(&wq->q_lock); |
| INIT_LIST_HEAD(&wq->q); |
| init_waitqueue_head(&wq->q_wait); |
| } |
| |
| struct completion_work { |
| struct drbd_work w; |
| struct completion done; |
| }; |
| |
| static int w_complete(struct drbd_work *w, int cancel) |
| { |
| struct completion_work *completion_work = |
| container_of(w, struct completion_work, w); |
| |
| complete(&completion_work->done); |
| return 0; |
| } |
| |
| void drbd_flush_workqueue(struct drbd_work_queue *work_queue) |
| { |
| struct completion_work completion_work; |
| |
| completion_work.w.cb = w_complete; |
| init_completion(&completion_work.done); |
| drbd_queue_work(work_queue, &completion_work.w); |
| wait_for_completion(&completion_work.done); |
| } |
| |
| struct drbd_resource *drbd_find_resource(const char *name) |
| { |
| struct drbd_resource *resource; |
| |
| if (!name || !name[0]) |
| return NULL; |
| |
| rcu_read_lock(); |
| for_each_resource_rcu(resource, &drbd_resources) { |
| if (!strcmp(resource->name, name)) { |
| kref_get(&resource->kref); |
| goto found; |
| } |
| } |
| resource = NULL; |
| found: |
| rcu_read_unlock(); |
| return resource; |
| } |
| |
| struct drbd_connection *conn_get_by_addrs(void *my_addr, int my_addr_len, |
| void *peer_addr, int peer_addr_len) |
| { |
| struct drbd_resource *resource; |
| struct drbd_connection *connection; |
| |
| rcu_read_lock(); |
| for_each_resource_rcu(resource, &drbd_resources) { |
| for_each_connection_rcu(connection, resource) { |
| if (connection->my_addr_len == my_addr_len && |
| connection->peer_addr_len == peer_addr_len && |
| !memcmp(&connection->my_addr, my_addr, my_addr_len) && |
| !memcmp(&connection->peer_addr, peer_addr, peer_addr_len)) { |
| kref_get(&connection->kref); |
| goto found; |
| } |
| } |
| } |
| connection = NULL; |
| found: |
| rcu_read_unlock(); |
| return connection; |
| } |
| |
| static int drbd_alloc_socket(struct drbd_socket *socket) |
| { |
| socket->rbuf = (void *) __get_free_page(GFP_KERNEL); |
| if (!socket->rbuf) |
| return -ENOMEM; |
| socket->sbuf = (void *) __get_free_page(GFP_KERNEL); |
| if (!socket->sbuf) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void drbd_free_socket(struct drbd_socket *socket) |
| { |
| free_page((unsigned long) socket->sbuf); |
| free_page((unsigned long) socket->rbuf); |
| } |
| |
| void conn_free_crypto(struct drbd_connection *connection) |
| { |
| drbd_free_sock(connection); |
| |
| crypto_free_shash(connection->csums_tfm); |
| crypto_free_shash(connection->verify_tfm); |
| crypto_free_shash(connection->cram_hmac_tfm); |
| crypto_free_shash(connection->integrity_tfm); |
| crypto_free_shash(connection->peer_integrity_tfm); |
| kfree(connection->int_dig_in); |
| kfree(connection->int_dig_vv); |
| |
| connection->csums_tfm = NULL; |
| connection->verify_tfm = NULL; |
| connection->cram_hmac_tfm = NULL; |
| connection->integrity_tfm = NULL; |
| connection->peer_integrity_tfm = NULL; |
| connection->int_dig_in = NULL; |
| connection->int_dig_vv = NULL; |
| } |
| |
| int set_resource_options(struct drbd_resource *resource, struct res_opts *res_opts) |
| { |
| struct drbd_connection *connection; |
| cpumask_var_t new_cpu_mask; |
| int err; |
| |
| if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) |
| return -ENOMEM; |
| |
| /* silently ignore cpu mask on UP kernel */ |
| if (nr_cpu_ids > 1 && res_opts->cpu_mask[0] != 0) { |
| err = bitmap_parse(res_opts->cpu_mask, DRBD_CPU_MASK_SIZE, |
| cpumask_bits(new_cpu_mask), nr_cpu_ids); |
| if (err == -EOVERFLOW) { |
| /* So what. mask it out. */ |
| cpumask_var_t tmp_cpu_mask; |
| if (zalloc_cpumask_var(&tmp_cpu_mask, GFP_KERNEL)) { |
| cpumask_setall(tmp_cpu_mask); |
| cpumask_and(new_cpu_mask, new_cpu_mask, tmp_cpu_mask); |
| drbd_warn(resource, "Overflow in bitmap_parse(%.12s%s), truncating to %u bits\n", |
| res_opts->cpu_mask, |
| strlen(res_opts->cpu_mask) > 12 ? "..." : "", |
| nr_cpu_ids); |
| free_cpumask_var(tmp_cpu_mask); |
| err = 0; |
| } |
| } |
| if (err) { |
| drbd_warn(resource, "bitmap_parse() failed with %d\n", err); |
| /* retcode = ERR_CPU_MASK_PARSE; */ |
| goto fail; |
| } |
| } |
| resource->res_opts = *res_opts; |
| if (cpumask_empty(new_cpu_mask)) |
| drbd_calc_cpu_mask(&new_cpu_mask); |
| if (!cpumask_equal(resource->cpu_mask, new_cpu_mask)) { |
| cpumask_copy(resource->cpu_mask, new_cpu_mask); |
| for_each_connection_rcu(connection, resource) { |
| connection->receiver.reset_cpu_mask = 1; |
| connection->ack_receiver.reset_cpu_mask = 1; |
| connection->worker.reset_cpu_mask = 1; |
| } |
| } |
| err = 0; |
| |
| fail: |
| free_cpumask_var(new_cpu_mask); |
| return err; |
| |
| } |
| |
| struct drbd_resource *drbd_create_resource(const char *name) |
| { |
| struct drbd_resource *resource; |
| |
| resource = kzalloc(sizeof(struct drbd_resource), GFP_KERNEL); |
| if (!resource) |
| goto fail; |
| resource->name = kstrdup(name, GFP_KERNEL); |
| if (!resource->name) |
| goto fail_free_resource; |
| if (!zalloc_cpumask_var(&resource->cpu_mask, GFP_KERNEL)) |
| goto fail_free_name; |
| kref_init(&resource->kref); |
| idr_init(&resource->devices); |
| INIT_LIST_HEAD(&resource->connections); |
| resource->write_ordering = WO_BDEV_FLUSH; |
| list_add_tail_rcu(&resource->resources, &drbd_resources); |
| mutex_init(&resource->conf_update); |
| mutex_init(&resource->adm_mutex); |
| spin_lock_init(&resource->req_lock); |
| drbd_debugfs_resource_add(resource); |
| return resource; |
| |
| fail_free_name: |
| kfree(resource->name); |
| fail_free_resource: |
| kfree(resource); |
| fail: |
| return NULL; |
| } |
| |
| /* caller must be under adm_mutex */ |
| struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts) |
| { |
| struct drbd_resource *resource; |
| struct drbd_connection *connection; |
| |
| connection = kzalloc(sizeof(struct drbd_connection), GFP_KERNEL); |
| if (!connection) |
| return NULL; |
| |
| if (drbd_alloc_socket(&connection->data)) |
| goto fail; |
| if (drbd_alloc_socket(&connection->meta)) |
| goto fail; |
| |
| connection->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL); |
| if (!connection->current_epoch) |
| goto fail; |
| |
| INIT_LIST_HEAD(&connection->transfer_log); |
| |
| INIT_LIST_HEAD(&connection->current_epoch->list); |
| connection->epochs = 1; |
| spin_lock_init(&connection->epoch_lock); |
| |
| connection->send.seen_any_write_yet = false; |
| connection->send.current_epoch_nr = 0; |
| connection->send.current_epoch_writes = 0; |
| |
| resource = drbd_create_resource(name); |
| if (!resource) |
| goto fail; |
| |
| connection->cstate = C_STANDALONE; |
| mutex_init(&connection->cstate_mutex); |
| init_waitqueue_head(&connection->ping_wait); |
| idr_init(&connection->peer_devices); |
| |
| drbd_init_workqueue(&connection->sender_work); |
| mutex_init(&connection->data.mutex); |
| mutex_init(&connection->meta.mutex); |
| |
| drbd_thread_init(resource, &connection->receiver, drbd_receiver, "receiver"); |
| connection->receiver.connection = connection; |
| drbd_thread_init(resource, &connection->worker, drbd_worker, "worker"); |
| connection->worker.connection = connection; |
| drbd_thread_init(resource, &connection->ack_receiver, drbd_ack_receiver, "ack_recv"); |
| connection->ack_receiver.connection = connection; |
| |
| kref_init(&connection->kref); |
| |
| connection->resource = resource; |
| |
| if (set_resource_options(resource, res_opts)) |
| goto fail_resource; |
| |
| kref_get(&resource->kref); |
| list_add_tail_rcu(&connection->connections, &resource->connections); |
| drbd_debugfs_connection_add(connection); |
| return connection; |
| |
| fail_resource: |
| list_del(&resource->resources); |
| drbd_free_resource(resource); |
| fail: |
| kfree(connection->current_epoch); |
| drbd_free_socket(&connection->meta); |
| drbd_free_socket(&connection->data); |
| kfree(connection); |
| return NULL; |
| } |
| |
| void drbd_destroy_connection(struct kref *kref) |
| { |
| struct drbd_connection *connection = container_of(kref, struct drbd_connection, kref); |
| struct drbd_resource *resource = connection->resource; |
| |
| if (atomic_read(&connection->current_epoch->epoch_size) != 0) |
| drbd_err(connection, "epoch_size:%d\n", atomic_read(&connection->current_epoch->epoch_size)); |
| kfree(connection->current_epoch); |
| |
| idr_destroy(&connection->peer_devices); |
| |
| drbd_free_socket(&connection->meta); |
| drbd_free_socket(&connection->data); |
| kfree(connection->int_dig_in); |
| kfree(connection->int_dig_vv); |
| kfree(connection); |
| kref_put(&resource->kref, drbd_destroy_resource); |
| } |
| |
| static int init_submitter(struct drbd_device *device) |
| { |
| /* opencoded create_singlethread_workqueue(), |
| * to be able to say "drbd%d", ..., minor */ |
| device->submit.wq = |
| alloc_ordered_workqueue("drbd%u_submit", WQ_MEM_RECLAIM, device->minor); |
| if (!device->submit.wq) |
| return -ENOMEM; |
| |
| INIT_WORK(&device->submit.worker, do_submit); |
| INIT_LIST_HEAD(&device->submit.writes); |
| return 0; |
| } |
| |
| enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsigned int minor) |
| { |
| struct drbd_resource *resource = adm_ctx->resource; |
| struct drbd_connection *connection, *n; |
| struct drbd_device *device; |
| struct drbd_peer_device *peer_device, *tmp_peer_device; |
| struct gendisk *disk; |
| int id; |
| int vnr = adm_ctx->volume; |
| enum drbd_ret_code err = ERR_NOMEM; |
| struct queue_limits lim = { |
| /* |
| * Setting the max_hw_sectors to an odd value of 8kibyte here. |
| * This triggers a max_bio_size message upon first attach or |
| * connect. |
| */ |
| .max_hw_sectors = DRBD_MAX_BIO_SIZE_SAFE >> 8, |
| .features = BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA | |
| BLK_FEAT_ROTATIONAL | |
| BLK_FEAT_STABLE_WRITES, |
| }; |
| |
| device = minor_to_device(minor); |
| if (device) |
| return ERR_MINOR_OR_VOLUME_EXISTS; |
| |
| /* GFP_KERNEL, we are outside of all write-out paths */ |
| device = kzalloc(sizeof(struct drbd_device), GFP_KERNEL); |
| if (!device) |
| return ERR_NOMEM; |
| kref_init(&device->kref); |
| |
| kref_get(&resource->kref); |
| device->resource = resource; |
| device->minor = minor; |
| device->vnr = vnr; |
| |
| drbd_init_set_defaults(device); |
| |
| disk = blk_alloc_disk(&lim, NUMA_NO_NODE); |
| if (IS_ERR(disk)) { |
| err = PTR_ERR(disk); |
| goto out_no_disk; |
| } |
| |
| device->vdisk = disk; |
| device->rq_queue = disk->queue; |
| |
| set_disk_ro(disk, true); |
| |
| disk->major = DRBD_MAJOR; |
| disk->first_minor = minor; |
| disk->minors = 1; |
| disk->fops = &drbd_ops; |
| disk->flags |= GENHD_FL_NO_PART; |
| sprintf(disk->disk_name, "drbd%d", minor); |
| disk->private_data = device; |
| |
| device->md_io.page = alloc_page(GFP_KERNEL); |
| if (!device->md_io.page) |
| goto out_no_io_page; |
| |
| if (drbd_bm_init(device)) |
| goto out_no_bitmap; |
| device->read_requests = RB_ROOT; |
| device->write_requests = RB_ROOT; |
| |
| id = idr_alloc(&drbd_devices, device, minor, minor + 1, GFP_KERNEL); |
| if (id < 0) { |
| if (id == -ENOSPC) |
| err = ERR_MINOR_OR_VOLUME_EXISTS; |
| goto out_no_minor_idr; |
| } |
| kref_get(&device->kref); |
| |
| id = idr_alloc(&resource->devices, device, vnr, vnr + 1, GFP_KERNEL); |
| if (id < 0) { |
| if (id == -ENOSPC) |
| err = ERR_MINOR_OR_VOLUME_EXISTS; |
| goto out_idr_remove_minor; |
| } |
| kref_get(&device->kref); |
| |
| INIT_LIST_HEAD(&device->peer_devices); |
| INIT_LIST_HEAD(&device->pending_bitmap_io); |
| for_each_connection(connection, resource) { |
| peer_device = kzalloc(sizeof(struct drbd_peer_device), GFP_KERNEL); |
| if (!peer_device) |
| goto out_idr_remove_from_resource; |
| peer_device->connection = connection; |
| peer_device->device = device; |
| |
| list_add(&peer_device->peer_devices, &device->peer_devices); |
| kref_get(&device->kref); |
| |
| id = idr_alloc(&connection->peer_devices, peer_device, vnr, vnr + 1, GFP_KERNEL); |
| if (id < 0) { |
| if (id == -ENOSPC) |
| err = ERR_INVALID_REQUEST; |
| goto out_idr_remove_from_resource; |
| } |
| kref_get(&connection->kref); |
| INIT_WORK(&peer_device->send_acks_work, drbd_send_acks_wf); |
| } |
| |
| if (init_submitter(device)) { |
| err = ERR_NOMEM; |
| goto out_idr_remove_from_resource; |
| } |
| |
| err = add_disk(disk); |
| if (err) |
| goto out_destroy_workqueue; |
| |
| /* inherit the connection state */ |
| device->state.conn = first_connection(resource)->cstate; |
| if (device->state.conn == C_WF_REPORT_PARAMS) { |
| for_each_peer_device(peer_device, device) |
| drbd_connected(peer_device); |
| } |
| /* move to create_peer_device() */ |
| for_each_peer_device(peer_device, device) |
| drbd_debugfs_peer_device_add(peer_device); |
| drbd_debugfs_device_add(device); |
| return NO_ERROR; |
| |
| out_destroy_workqueue: |
| destroy_workqueue(device->submit.wq); |
| out_idr_remove_from_resource: |
| for_each_connection_safe(connection, n, resource) { |
| peer_device = idr_remove(&connection->peer_devices, vnr); |
| if (peer_device) |
| kref_put(&connection->kref, drbd_destroy_connection); |
| } |
| for_each_peer_device_safe(peer_device, tmp_peer_device, device) { |
| list_del(&peer_device->peer_devices); |
| kfree(peer_device); |
| } |
| idr_remove(&resource->devices, vnr); |
| out_idr_remove_minor: |
| idr_remove(&drbd_devices, minor); |
| synchronize_rcu(); |
| out_no_minor_idr: |
| drbd_bm_cleanup(device); |
| out_no_bitmap: |
| __free_page(device->md_io.page); |
| out_no_io_page: |
| put_disk(disk); |
| out_no_disk: |
| kref_put(&resource->kref, drbd_destroy_resource); |
| kfree(device); |
| return err; |
| } |
| |
| void drbd_delete_device(struct drbd_device *device) |
| { |
| struct drbd_resource *resource = device->resource; |
| struct drbd_connection *connection; |
| struct drbd_peer_device *peer_device; |
| |
| /* move to free_peer_device() */ |
| for_each_peer_device(peer_device, device) |
| drbd_debugfs_peer_device_cleanup(peer_device); |
| drbd_debugfs_device_cleanup(device); |
| for_each_connection(connection, resource) { |
| idr_remove(&connection->peer_devices, device->vnr); |
| kref_put(&device->kref, drbd_destroy_device); |
| } |
| idr_remove(&resource->devices, device->vnr); |
| kref_put(&device->kref, drbd_destroy_device); |
| idr_remove(&drbd_devices, device_to_minor(device)); |
| kref_put(&device->kref, drbd_destroy_device); |
| del_gendisk(device->vdisk); |
| synchronize_rcu(); |
| kref_put(&device->kref, drbd_destroy_device); |
| } |
| |
| static int __init drbd_init(void) |
| { |
| int err; |
| |
| if (drbd_minor_count < DRBD_MINOR_COUNT_MIN || drbd_minor_count > DRBD_MINOR_COUNT_MAX) { |
| pr_err("invalid minor_count (%d)\n", drbd_minor_count); |
| #ifdef MODULE |
| return -EINVAL; |
| #else |
| drbd_minor_count = DRBD_MINOR_COUNT_DEF; |
| #endif |
| } |
| |
| err = register_blkdev(DRBD_MAJOR, "drbd"); |
| if (err) { |
| pr_err("unable to register block device major %d\n", |
| DRBD_MAJOR); |
| return err; |
| } |
| |
| /* |
| * allocate all necessary structs |
| */ |
| init_waitqueue_head(&drbd_pp_wait); |
| |
| drbd_proc = NULL; /* play safe for drbd_cleanup */ |
| idr_init(&drbd_devices); |
| |
| mutex_init(&resources_mutex); |
| INIT_LIST_HEAD(&drbd_resources); |
| |
| err = drbd_genl_register(); |
| if (err) { |
| pr_err("unable to register generic netlink family\n"); |
| goto fail; |
| } |
| |
| err = drbd_create_mempools(); |
| if (err) |
| goto fail; |
| |
| err = -ENOMEM; |
| drbd_proc = proc_create_single("drbd", S_IFREG | 0444 , NULL, drbd_seq_show); |
| if (!drbd_proc) { |
| pr_err("unable to register proc file\n"); |
| goto fail; |
| } |
| |
| retry.wq = create_singlethread_workqueue("drbd-reissue"); |
| if (!retry.wq) { |
| pr_err("unable to create retry workqueue\n"); |
| goto fail; |
| } |
| INIT_WORK(&retry.worker, do_retry); |
| spin_lock_init(&retry.lock); |
| INIT_LIST_HEAD(&retry.writes); |
| |
| drbd_debugfs_init(); |
| |
| pr_info("initialized. " |
| "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n", |
| GENL_MAGIC_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX); |
| pr_info("%s\n", drbd_buildtag()); |
| pr_info("registered as block device major %d\n", DRBD_MAJOR); |
| return 0; /* Success! */ |
| |
| fail: |
| drbd_cleanup(); |
| if (err == -ENOMEM) |
| pr_err("ran out of memory\n"); |
| else |
| pr_err("initialization failure\n"); |
| return err; |
| } |
| |
| static void drbd_free_one_sock(struct drbd_socket *ds) |
| { |
| struct socket *s; |
| mutex_lock(&ds->mutex); |
| s = ds->socket; |
| ds->socket = NULL; |
| mutex_unlock(&ds->mutex); |
| if (s) { |
| /* so debugfs does not need to mutex_lock() */ |
| synchronize_rcu(); |
| kernel_sock_shutdown(s, SHUT_RDWR); |
| sock_release(s); |
| } |
| } |
| |
| void drbd_free_sock(struct drbd_connection *connection) |
| { |
| if (connection->data.socket) |
| drbd_free_one_sock(&connection->data); |
| if (connection->meta.socket) |
| drbd_free_one_sock(&connection->meta); |
| } |
| |
| /* meta data management */ |
| |
| void conn_md_sync(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_md_sync(device); |
| kref_put(&device->kref, drbd_destroy_device); |
| rcu_read_lock(); |
| } |
| rcu_read_unlock(); |
| } |
| |
| /* aligned 4kByte */ |
| struct meta_data_on_disk { |
| u64 la_size_sect; /* last agreed size. */ |
| u64 uuid[UI_SIZE]; /* UUIDs. */ |
| u64 device_uuid; |
| u64 reserved_u64_1; |
| u32 flags; /* MDF */ |
| u32 magic; |
| u32 md_size_sect; |
| u32 al_offset; /* offset to this block */ |
| u32 al_nr_extents; /* important for restoring the AL (userspace) */ |
| /* `-- act_log->nr_elements <-- ldev->dc.al_extents */ |
| u32 bm_offset; /* offset to the bitmap, from here */ |
| u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */ |
| u32 la_peer_max_bio_size; /* last peer max_bio_size */ |
| |
| /* see al_tr_number_to_on_disk_sector() */ |
| u32 al_stripes; |
| u32 al_stripe_size_4k; |
| |
| u8 reserved_u8[4096 - (7*8 + 10*4)]; |
| } __packed; |
| |
| |
| |
| void drbd_md_write(struct drbd_device *device, void *b) |
| { |
| struct meta_data_on_disk *buffer = b; |
| sector_t sector; |
| int i; |
| |
| memset(buffer, 0, sizeof(*buffer)); |
| |
| buffer->la_size_sect = cpu_to_be64(get_capacity(device->vdisk)); |
| for (i = UI_CURRENT; i < UI_SIZE; i++) |
| buffer->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]); |
| buffer->flags = cpu_to_be32(device->ldev->md.flags); |
| buffer->magic = cpu_to_be32(DRBD_MD_MAGIC_84_UNCLEAN); |
| |
| buffer->md_size_sect = cpu_to_be32(device->ldev->md.md_size_sect); |
| buffer->al_offset = cpu_to_be32(device->ldev->md.al_offset); |
| buffer->al_nr_extents = cpu_to_be32(device->act_log->nr_elements); |
| buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE); |
| buffer->device_uuid = cpu_to_be64(device->ldev->md.device_uuid); |
| |
| buffer->bm_offset = cpu_to_be32(device->ldev->md.bm_offset); |
| buffer->la_peer_max_bio_size = cpu_to_be32(device->peer_max_bio_size); |
| |
| buffer->al_stripes = cpu_to_be32(device->ldev->md.al_stripes); |
| buffer->al_stripe_size_4k = cpu_to_be32(device->ldev->md.al_stripe_size_4k); |
| |
| D_ASSERT(device, drbd_md_ss(device->ldev) == device->ldev->md.md_offset); |
| sector = device->ldev->md.md_offset; |
| |
| if (drbd_md_sync_page_io(device, device->ldev, sector, REQ_OP_WRITE)) { |
| /* this was a try anyways ... */ |
| drbd_err(device, "meta data update failed!\n"); |
| drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR); |
| } |
| } |
| |
| /** |
| * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set |
| * @device: DRBD device. |
| */ |
| void drbd_md_sync(struct drbd_device *device) |
| { |
| struct meta_data_on_disk *buffer; |
| |
| /* Don't accidentally change the DRBD meta data layout. */ |
| BUILD_BUG_ON(UI_SIZE != 4); |
| BUILD_BUG_ON(sizeof(struct meta_data_on_disk) != 4096); |
| |
| del_timer(&device->md_sync_timer); |
| /* timer may be rearmed by drbd_md_mark_dirty() now. */ |
| if (!test_and_clear_bit(MD_DIRTY, &device->flags)) |
| return; |
| |
| /* We use here D_FAILED and not D_ATTACHING because we try to write |
| * metadata even if we detach due to a disk failure! */ |
| if (!get_ldev_if_state(device, D_FAILED)) |
| return; |
| |
| buffer = drbd_md_get_buffer(device, __func__); |
| if (!buffer) |
| goto out; |
| |
| drbd_md_write(device, buffer); |
| |
| /* Update device->ldev->md.la_size_sect, |
| * since we updated it on metadata. */ |
| device->ldev->md.la_size_sect = get_capacity(device->vdisk); |
| |
| drbd_md_put_buffer(device); |
| out: |
| put_ldev(device); |
| } |
| |
| static int check_activity_log_stripe_size(struct drbd_device *device, |
| struct meta_data_on_disk *on_disk, |
| struct drbd_md *in_core) |
| { |
| u32 al_stripes = be32_to_cpu(on_disk->al_stripes); |
| u32 al_stripe_size_4k = be32_to_cpu(on_disk->al_stripe_size_4k); |
| u64 al_size_4k; |
| |
| /* both not set: default to old fixed size activity log */ |
| if (al_stripes == 0 && al_stripe_size_4k == 0) { |
| al_stripes = 1; |
| al_stripe_size_4k = MD_32kB_SECT/8; |
| } |
| |
| /* some paranoia plausibility checks */ |
| |
| /* we need both values to be set */ |
| if (al_stripes == 0 || al_stripe_size_4k == 0) |
| goto err; |
| |
| al_size_4k = (u64)al_stripes * al_stripe_size_4k; |
| |
| /* Upper limit of activity log area, to avoid potential overflow |
| * problems in al_tr_number_to_on_disk_sector(). As right now, more |
| * than 72 * 4k blocks total only increases the amount of history, |
| * limiting this arbitrarily to 16 GB is not a real limitation ;-) */ |
| if (al_size_4k > (16 * 1024 * 1024/4)) |
| goto err; |
| |
| /* Lower limit: we need at least 8 transaction slots (32kB) |
| * to not break existing setups */ |
| if (al_size_4k < MD_32kB_SECT/8) |
| goto err; |
| |
| in_core->al_stripe_size_4k = al_stripe_size_4k; |
| in_core->al_stripes = al_stripes; |
| in_core->al_size_4k = al_size_4k; |
| |
| return 0; |
| err: |
| drbd_err(device, "invalid activity log striping: al_stripes=%u, al_stripe_size_4k=%u\n", |
| al_stripes, al_stripe_size_4k); |
| return -EINVAL; |
| } |
| |
| static int check_offsets_and_sizes(struct drbd_device *device, struct drbd_backing_dev *bdev) |
| { |
| sector_t capacity = drbd_get_capacity(bdev->md_bdev); |
| struct drbd_md *in_core = &bdev->md; |
| s32 on_disk_al_sect; |
| s32 on_disk_bm_sect; |
| |
| /* The on-disk size of the activity log, calculated from offsets, and |
| * the size of the activity log calculated from the stripe settings, |
| * should match. |
| * Though we could relax this a bit: it is ok, if the striped activity log |
| * fits in the available on-disk activity log size. |
| * Right now, that would break how resize is implemented. |
| * TODO: make drbd_determine_dev_size() (and the drbdmeta tool) aware |
| * of possible unused padding space in the on disk layout. */ |
| if (in_core->al_offset < 0) { |
| if (in_core->bm_offset > in_core->al_offset) |
| goto err; |
| on_disk_al_sect = -in_core->al_offset; |
| on_disk_bm_sect = in_core->al_offset - in_core->bm_offset; |
| } else { |
| if (in_core->al_offset != MD_4kB_SECT) |
| goto err; |
| if (in_core->bm_offset < in_core->al_offset + in_core->al_size_4k * MD_4kB_SECT) |
| goto err; |
| |
| on_disk_al_sect = in_core->bm_offset - MD_4kB_SECT; |
| on_disk_bm_sect = in_core->md_size_sect - in_core->bm_offset; |
| } |
| |
| /* old fixed size meta data is exactly that: fixed. */ |
| if (in_core->meta_dev_idx >= 0) { |
| if (in_core->md_size_sect != MD_128MB_SECT |
| || in_core->al_offset != MD_4kB_SECT |
| || in_core->bm_offset != MD_4kB_SECT + MD_32kB_SECT |
| || in_core->al_stripes != 1 |
| || in_core->al_stripe_size_4k != MD_32kB_SECT/8) |
| goto err; |
| } |
| |
| if (capacity < in_core->md_size_sect) |
| goto err; |
| if (capacity - in_core->md_size_sect < drbd_md_first_sector(bdev)) |
| goto err; |
| |
| /* should be aligned, and at least 32k */ |
| if ((on_disk_al_sect & 7) || (on_disk_al_sect < MD_32kB_SECT)) |
| goto err; |
| |
| /* should fit (for now: exactly) into the available on-disk space; |
| * overflow prevention is in check_activity_log_stripe_size() above. */ |
| if (on_disk_al_sect != in_core->al_size_4k * MD_4kB_SECT) |
| goto err; |
| |
| /* again, should be aligned */ |
| if (in_core->bm_offset & 7) |
| goto err; |
| |
| /* FIXME check for device grow with flex external meta data? */ |
| |
| /* can the available bitmap space cover the last agreed device size? */ |
| if (on_disk_bm_sect < (in_core->la_size_sect+7)/MD_4kB_SECT/8/512) |
| goto err; |
| |
| return 0; |
| |
| err: |
| drbd_err(device, "meta data offsets don't make sense: idx=%d " |
| "al_s=%u, al_sz4k=%u, al_offset=%d, bm_offset=%d, " |
| "md_size_sect=%u, la_size=%llu, md_capacity=%llu\n", |
| in_core->meta_dev_idx, |
| in_core->al_stripes, in_core->al_stripe_size_4k, |
| in_core->al_offset, in_core->bm_offset, in_core->md_size_sect, |
| (unsigned long long)in_core->la_size_sect, |
| (unsigned long long)capacity); |
| |
| return -EINVAL; |
| } |
| |
| |
| /** |
| * drbd_md_read() - Reads in the meta data super block |
| * @device: DRBD device. |
| * @bdev: Device from which the meta data should be read in. |
| * |
| * Return NO_ERROR on success, and an enum drbd_ret_code in case |
| * something goes wrong. |
| * |
| * Called exactly once during drbd_adm_attach(), while still being D_DISKLESS, |
| * even before @bdev is assigned to @device->ldev. |
| */ |
| int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev) |
| { |
| struct meta_data_on_disk *buffer; |
| u32 magic, flags; |
| int i, rv = NO_ERROR; |
| |
| if (device->state.disk != D_DISKLESS) |
| return ERR_DISK_CONFIGURED; |
| |
| buffer = drbd_md_get_buffer(device, __func__); |
| if (!buffer) |
| return ERR_NOMEM; |
| |
| /* First, figure out where our meta data superblock is located, |
| * and read it. */ |
| bdev->md.meta_dev_idx = bdev->disk_conf->meta_dev_idx; |
| bdev->md.md_offset = drbd_md_ss(bdev); |
| /* Even for (flexible or indexed) external meta data, |
| * initially restrict us to the 4k superblock for now. |
| * Affects the paranoia out-of-range access check in drbd_md_sync_page_io(). */ |
| bdev->md.md_size_sect = 8; |
| |
| if (drbd_md_sync_page_io(device, bdev, bdev->md.md_offset, |
| REQ_OP_READ)) { |
| /* NOTE: can't do normal error processing here as this is |
| called BEFORE disk is attached */ |
| drbd_err(device, "Error while reading metadata.\n"); |
| rv = ERR_IO_MD_DISK; |
| goto err; |
| } |
| |
| magic = be32_to_cpu(buffer->magic); |
| flags = be32_to_cpu(buffer->flags); |
| if (magic == DRBD_MD_MAGIC_84_UNCLEAN || |
| (magic == DRBD_MD_MAGIC_08 && !(flags & MDF_AL_CLEAN))) { |
| /* btw: that's Activity Log clean, not "all" clean. */ |
| drbd_err(device, "Found unclean meta data. Did you \"drbdadm apply-al\"?\n"); |
| rv = ERR_MD_UNCLEAN; |
| goto err; |
| } |
| |
| rv = ERR_MD_INVALID; |
| if (magic != DRBD_MD_MAGIC_08) { |
| if (magic == DRBD_MD_MAGIC_07) |
| drbd_err(device, "Found old (0.7) meta data magic. Did you \"drbdadm create-md\"?\n"); |
| else |
| drbd_err(device, "Meta data magic not found. Did you \"drbdadm create-md\"?\n"); |
| goto err; |
| } |
| |
| if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) { |
| drbd_err(device, "unexpected bm_bytes_per_bit: %u (expected %u)\n", |
| be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE); |
| goto err; |
| } |
| |
| |
| /* convert to in_core endian */ |
| bdev->md.la_size_sect = be64_to_cpu(buffer->la_size_sect); |
| for (i = UI_CURRENT; i < UI_SIZE; i++) |
| bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]); |
| bdev->md.flags = be32_to_cpu(buffer->flags); |
| bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid); |
| |
| bdev->md.md_size_sect = be32_to_cpu(buffer->md_size_sect); |
| bdev->md.al_offset = be32_to_cpu(buffer->al_offset); |
| bdev->md.bm_offset = be32_to_cpu(buffer->bm_offset); |
| |
| if (check_activity_log_stripe_size(device, buffer, &bdev->md)) |
| goto err; |
| if (check_offsets_and_sizes(device, bdev)) |
| goto err; |
| |
| if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) { |
| drbd_err(device, "unexpected bm_offset: %d (expected %d)\n", |
| be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset); |
| goto err; |
| } |
| if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) { |
| drbd_err(device, "unexpected md_size: %u (expected %u)\n", |
| be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect); |
| goto err; |
| } |
| |
| rv = NO_ERROR; |
| |
| spin_lock_irq(&device->resource->req_lock); |
| if (device->state.conn < C_CONNECTED) { |
| unsigned int peer; |
| peer = be32_to_cpu(buffer->la_peer_max_bio_size); |
| peer = max(peer, DRBD_MAX_BIO_SIZE_SAFE); |
| device->peer_max_bio_size = peer; |
| } |
| spin_unlock_irq(&device->resource->req_lock); |
| |
| err: |
| drbd_md_put_buffer(device); |
| |
| return rv; |
| } |
| |
| /** |
| * drbd_md_mark_dirty() - Mark meta data super block as dirty |
| * @device: DRBD device. |
| * |
| * Call this function if you change anything that should be written to |
| * the meta-data super block. This function sets MD_DIRTY, and starts a |
| * timer that ensures that within five seconds you have to call drbd_md_sync(). |
| */ |
| void drbd_md_mark_dirty(struct drbd_device *device) |
| { |
| if (!test_and_set_bit(MD_DIRTY, &device->flags)) |
| mod_timer(&device->md_sync_timer, jiffies + 5*HZ); |
| } |
| |
| void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local) |
| { |
| int i; |
| |
| for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++) |
| device->ldev->md.uuid[i+1] = device->ldev->md.uuid[i]; |
| } |
| |
| void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local) |
| { |
| if (idx == UI_CURRENT) { |
| if (device->state.role == R_PRIMARY) |
| val |= 1; |
| else |
| val &= ~((u64)1); |
| |
| drbd_set_ed_uuid(device, val); |
| } |
| |
| device->ldev->md.uuid[idx] = val; |
| drbd_md_mark_dirty(device); |
| } |
| |
| void _drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local) |
| { |
| unsigned long flags; |
| spin_lock_irqsave(&device->ldev->md.uuid_lock, flags); |
| __drbd_uuid_set(device, idx, val); |
| spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags); |
| } |
| |
| void drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local) |
| { |
| unsigned long flags; |
| spin_lock_irqsave(&device->ldev->md.uuid_lock, flags); |
| if (device->ldev->md.uuid[idx]) { |
| drbd_uuid_move_history(device); |
| device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[idx]; |
| } |
| __drbd_uuid_set(device, idx, val); |
| spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags); |
| } |
| |
| /** |
| * drbd_uuid_new_current() - Creates a new current UUID |
| * @device: DRBD device. |
| * |
| * Creates a new current UUID, and rotates the old current UUID into |
| * the bitmap slot. Causes an incremental resync upon next connect. |
| */ |
| void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local) |
| { |
| u64 val; |
| unsigned long long bm_uuid; |
| |
| get_random_bytes(&val, sizeof(u64)); |
| |
| spin_lock_irq(&device->ldev->md.uuid_lock); |
| bm_uuid = device->ldev->md.uuid[UI_BITMAP]; |
| |
| if (bm_uuid) |
| drbd_warn(device, "bm UUID was already set: %llX\n", bm_uuid); |
| |
| device->ldev->md.uuid[UI_BITMAP] = device->ldev->md.uuid[UI_CURRENT]; |
| __drbd_uuid_set(device, UI_CURRENT, val); |
| spin_unlock_irq(&device->ldev->md.uuid_lock); |
| |
| drbd_print_uuids(device, "new current UUID"); |
| /* get it to stable storage _now_ */ |
| drbd_md_sync(device); |
| } |
| |
| void drbd_uuid_set_bm(struct drbd_device *device, u64 val) __must_hold(local) |
| { |
| unsigned long flags; |
| spin_lock_irqsave(&device->ldev->md.uuid_lock, flags); |
| if (device->ldev->md.uuid[UI_BITMAP] == 0 && val == 0) { |
| spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags); |
| return; |
| } |
| |
| if (val == 0) { |
| 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; |
| } else { |
| unsigned long long bm_uuid = device->ldev->md.uuid[UI_BITMAP]; |
| if (bm_uuid) |
| drbd_warn(device, "bm UUID was already set: %llX\n", bm_uuid); |
| |
| device->ldev->md.uuid[UI_BITMAP] = val & ~((u64)1); |
| } |
| spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags); |
| |
| drbd_md_mark_dirty(device); |
| } |
| |
| /** |
| * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io() |
| * @device: DRBD device. |
| * @peer_device: Peer DRBD device. |
| * |
| * Sets all bits in the bitmap and writes the whole bitmap to stable storage. |
| */ |
| int drbd_bmio_set_n_write(struct drbd_device *device, |
| struct drbd_peer_device *peer_device) __must_hold(local) |
| |
| { |
| int rv = -EIO; |
| |
| drbd_md_set_flag(device, MDF_FULL_SYNC); |
| drbd_md_sync(device); |
| drbd_bm_set_all(device); |
| |
| rv = drbd_bm_write(device, peer_device); |
| |
| if (!rv) { |
| drbd_md_clear_flag(device, MDF_FULL_SYNC); |
| drbd_md_sync(device); |
| } |
| |
| return rv; |
| } |
| |
| /** |
| * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io() |
| * @device: DRBD device. |
| * @peer_device: Peer DRBD device. |
| * |
| * Clears all bits in the bitmap and writes the whole bitmap to stable storage. |
| */ |
| int drbd_bmio_clear_n_write(struct drbd_device *device, |
| struct drbd_peer_device *peer_device) __must_hold(local) |
| |
| { |
| drbd_resume_al(device); |
| drbd_bm_clear_all(device); |
| return drbd_bm_write(device, peer_device); |
| } |
| |
| static int w_bitmap_io(struct drbd_work *w, int unused) |
| { |
| struct drbd_device *device = |
| container_of(w, struct drbd_device, bm_io_work.w); |
| struct bm_io_work *work = &device->bm_io_work; |
| int rv = -EIO; |
| |
| if (work->flags != BM_LOCKED_CHANGE_ALLOWED) { |
| int cnt = atomic_read(&device->ap_bio_cnt); |
| if (cnt) |
| drbd_err(device, "FIXME: ap_bio_cnt %d, expected 0; queued for '%s'\n", |
| cnt, work->why); |
| } |
| |
| if (get_ldev(device)) { |
| drbd_bm_lock(device, work->why, work->flags); |
| rv = work->io_fn(device, work->peer_device); |
| drbd_bm_unlock(device); |
| put_ldev(device); |
| } |
| |
| clear_bit_unlock(BITMAP_IO, &device->flags); |
| wake_up(&device->misc_wait); |
| |
| if (work->done) |
| work->done(device, rv); |
| |
| clear_bit(BITMAP_IO_QUEUED, &device->flags); |
| work->why = NULL; |
| work->flags = 0; |
| |
| return 0; |
| } |
| |
| /** |
| * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap |
| * @device: DRBD device. |
| * @io_fn: IO callback to be called when bitmap IO is possible |
| * @done: callback to be called after the bitmap IO was performed |
| * @why: Descriptive text of the reason for doing the IO |
| * @flags: Bitmap flags |
| * @peer_device: Peer DRBD device. |
| * |
| * While IO on the bitmap happens we freeze application IO thus we ensure |
| * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be |
| * called from worker context. It MUST NOT be used while a previous such |
| * work is still pending! |
| * |
| * Its worker function encloses the call of io_fn() by get_ldev() and |
| * put_ldev(). |
| */ |
| void drbd_queue_bitmap_io(struct drbd_device *device, |
| int (*io_fn)(struct drbd_device *, struct drbd_peer_device *), |
| void (*done)(struct drbd_device *, int), |
| char *why, enum bm_flag flags, |
| struct drbd_peer_device *peer_device) |
| { |
| D_ASSERT(device, current == peer_device->connection->worker.task); |
| |
| D_ASSERT(device, !test_bit(BITMAP_IO_QUEUED, &device->flags)); |
| D_ASSERT(device, !test_bit(BITMAP_IO, &device->flags)); |
| D_ASSERT(device, list_empty(&device->bm_io_work.w.list)); |
| if (device->bm_io_work.why) |
| drbd_err(device, "FIXME going to queue '%s' but '%s' still pending?\n", |
| why, device->bm_io_work.why); |
| |
| device->bm_io_work.peer_device = peer_device; |
| device->bm_io_work.io_fn = io_fn; |
| device->bm_io_work.done = done; |
| device->bm_io_work.why = why; |
| device->bm_io_work.flags = flags; |
| |
| spin_lock_irq(&device->resource->req_lock); |
| set_bit(BITMAP_IO, &device->flags); |
| /* don't wait for pending application IO if the caller indicates that |
| * application IO does not conflict anyways. */ |
| if (flags == BM_LOCKED_CHANGE_ALLOWED || atomic_read(&device->ap_bio_cnt) == 0) { |
| if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags)) |
| drbd_queue_work(&peer_device->connection->sender_work, |
| &device->bm_io_work.w); |
| } |
| spin_unlock_irq(&device->resource->req_lock); |
| } |
| |
| /** |
| * drbd_bitmap_io() - Does an IO operation on the whole bitmap |
| * @device: DRBD device. |
| * @io_fn: IO callback to be called when bitmap IO is possible |
| * @why: Descriptive text of the reason for doing the IO |
| * @flags: Bitmap flags |
| * @peer_device: Peer DRBD device. |
| * |
| * freezes application IO while that the actual IO operations runs. This |
| * functions MAY NOT be called from worker context. |
| */ |
| int drbd_bitmap_io(struct drbd_device *device, |
| int (*io_fn)(struct drbd_device *, struct drbd_peer_device *), |
| char *why, enum bm_flag flags, |
| struct drbd_peer_device *peer_device) |
| { |
| /* Only suspend io, if some operation is supposed to be locked out */ |
| const bool do_suspend_io = flags & (BM_DONT_CLEAR|BM_DONT_SET|BM_DONT_TEST); |
| int rv; |
| |
| D_ASSERT(device, current != first_peer_device(device)->connection->worker.task); |
| |
| if (do_suspend_io) |
| drbd_suspend_io(device); |
| |
| drbd_bm_lock(device, why, flags); |
| rv = io_fn(device, peer_device); |
| drbd_bm_unlock(device); |
| |
| if (do_suspend_io) |
| drbd_resume_io(device); |
| |
| return rv; |
| } |
| |
| void drbd_md_set_flag(struct drbd_device *device, int flag) __must_hold(local) |
| { |
| if ((device->ldev->md.flags & flag) != flag) { |
| drbd_md_mark_dirty(device); |
| device->ldev->md.flags |= flag; |
| } |
| } |
| |
| void drbd_md_clear_flag(struct drbd_device *device, int flag) __must_hold(local) |
| { |
| if ((device->ldev->md.flags & flag) != 0) { |
| drbd_md_mark_dirty(device); |
| device->ldev->md.flags &= ~flag; |
| } |
| } |
| int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag) |
| { |
| return (bdev->md.flags & flag) != 0; |
| } |
| |
| static void md_sync_timer_fn(struct timer_list *t) |
| { |
| struct drbd_device *device = from_timer(device, t, md_sync_timer); |
| drbd_device_post_work(device, MD_SYNC); |
| } |
| |
| const char *cmdname(enum drbd_packet cmd) |
| { |
| /* THINK may need to become several global tables |
| * when we want to support more than |
| * one PRO_VERSION */ |
| static const char *cmdnames[] = { |
| |
| [P_DATA] = "Data", |
| [P_DATA_REPLY] = "DataReply", |
| [P_RS_DATA_REPLY] = "RSDataReply", |
| [P_BARRIER] = "Barrier", |
| [P_BITMAP] = "ReportBitMap", |
| [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget", |
| [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource", |
| [P_UNPLUG_REMOTE] = "UnplugRemote", |
| [P_DATA_REQUEST] = "DataRequest", |
| [P_RS_DATA_REQUEST] = "RSDataRequest", |
| [P_SYNC_PARAM] = "SyncParam", |
| [P_PROTOCOL] = "ReportProtocol", |
| [P_UUIDS] = "ReportUUIDs", |
| [P_SIZES] = "ReportSizes", |
| [P_STATE] = "ReportState", |
| [P_SYNC_UUID] = "ReportSyncUUID", |
| [P_AUTH_CHALLENGE] = "AuthChallenge", |
| [P_AUTH_RESPONSE] = "AuthResponse", |
| [P_STATE_CHG_REQ] = "StateChgRequest", |
| [P_PING] = "Ping", |
| [P_PING_ACK] = "PingAck", |
| [P_RECV_ACK] = "RecvAck", |
| [P_WRITE_ACK] = "WriteAck", |
| [P_RS_WRITE_ACK] = "RSWriteAck", |
| [P_SUPERSEDED] = "Superseded", |
| [P_NEG_ACK] = "NegAck", |
| [P_NEG_DREPLY] = "NegDReply", |
| [P_NEG_RS_DREPLY] = "NegRSDReply", |
| [P_BARRIER_ACK] = "BarrierAck", |
| [P_STATE_CHG_REPLY] = "StateChgReply", |
| [P_OV_REQUEST] = "OVRequest", |
| [P_OV_REPLY] = "OVReply", |
| [P_OV_RESULT] = "OVResult", |
| [P_CSUM_RS_REQUEST] = "CsumRSRequest", |
| [P_RS_IS_IN_SYNC] = "CsumRSIsInSync", |
| [P_SYNC_PARAM89] = "SyncParam89", |
| [P_COMPRESSED_BITMAP] = "CBitmap", |
| [P_DELAY_PROBE] = "DelayProbe", |
| [P_OUT_OF_SYNC] = "OutOfSync", |
| [P_RS_CANCEL] = "RSCancel", |
| [P_CONN_ST_CHG_REQ] = "conn_st_chg_req", |
| [P_CONN_ST_CHG_REPLY] = "conn_st_chg_reply", |
| [P_PROTOCOL_UPDATE] = "protocol_update", |
| [P_TRIM] = "Trim", |
| [P_RS_THIN_REQ] = "rs_thin_req", |
| [P_RS_DEALLOCATED] = "rs_deallocated", |
| [P_WSAME] = "WriteSame", |
| [P_ZEROES] = "Zeroes", |
| |
| /* enum drbd_packet, but not commands - obsoleted flags: |
| * P_MAY_IGNORE |
| * P_MAX_OPT_CMD |
| */ |
| }; |
| |
| /* too big for the array: 0xfffX */ |
| if (cmd == P_INITIAL_META) |
| return "InitialMeta"; |
| if (cmd == P_INITIAL_DATA) |
| return "InitialData"; |
| if (cmd == P_CONNECTION_FEATURES) |
| return "ConnectionFeatures"; |
| if (cmd >= ARRAY_SIZE(cmdnames)) |
| return "Unknown"; |
| return cmdnames[cmd]; |
| } |
| |
| /** |
| * drbd_wait_misc - wait for a request to make progress |
| * @device: device associated with the request |
| * @i: the struct drbd_interval embedded in struct drbd_request or |
| * struct drbd_peer_request |
| */ |
| int drbd_wait_misc(struct drbd_device *device, struct drbd_interval *i) |
| { |
| struct net_conf *nc; |
| DEFINE_WAIT(wait); |
| long timeout; |
| |
| rcu_read_lock(); |
| nc = rcu_dereference(first_peer_device(device)->connection->net_conf); |
| if (!nc) { |
| rcu_read_unlock(); |
| return -ETIMEDOUT; |
| } |
| timeout = nc->ko_count ? nc->timeout * HZ / 10 * nc->ko_count : MAX_SCHEDULE_TIMEOUT; |
| rcu_read_unlock(); |
| |
| /* Indicate to wake up device->misc_wait on progress. */ |
| i->waiting = true; |
| prepare_to_wait(&device->misc_wait, &wait, TASK_INTERRUPTIBLE); |
| spin_unlock_irq(&device->resource->req_lock); |
| timeout = schedule_timeout(timeout); |
| finish_wait(&device->misc_wait, &wait); |
| spin_lock_irq(&device->resource->req_lock); |
| if (!timeout || device->state.conn < C_CONNECTED) |
| return -ETIMEDOUT; |
| if (signal_pending(current)) |
| return -ERESTARTSYS; |
| return 0; |
| } |
| |
| void lock_all_resources(void) |
| { |
| struct drbd_resource *resource; |
| int __maybe_unused i = 0; |
| |
| mutex_lock(&resources_mutex); |
| local_irq_disable(); |
| for_each_resource(resource, &drbd_resources) |
| spin_lock_nested(&resource->req_lock, i++); |
| } |
| |
| void unlock_all_resources(void) |
| { |
| struct drbd_resource *resource; |
| |
| for_each_resource(resource, &drbd_resources) |
| spin_unlock(&resource->req_lock); |
| local_irq_enable(); |
| mutex_unlock(&resources_mutex); |
| } |
| |
| #ifdef CONFIG_DRBD_FAULT_INJECTION |
| /* Fault insertion support including random number generator shamelessly |
| * stolen from kernel/rcutorture.c */ |
| struct fault_random_state { |
| unsigned long state; |
| unsigned long count; |
| }; |
| |
| #define FAULT_RANDOM_MULT 39916801 /* prime */ |
| #define FAULT_RANDOM_ADD 479001701 /* prime */ |
| #define FAULT_RANDOM_REFRESH 10000 |
| |
| /* |
| * Crude but fast random-number generator. Uses a linear congruential |
| * generator, with occasional help from get_random_bytes(). |
| */ |
| static unsigned long |
| _drbd_fault_random(struct fault_random_state *rsp) |
| { |
| long refresh; |
| |
| if (!rsp->count--) { |
| get_random_bytes(&refresh, sizeof(refresh)); |
| rsp->state += refresh; |
| rsp->count = FAULT_RANDOM_REFRESH; |
| } |
| rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD; |
| return swahw32(rsp->state); |
| } |
| |
| static char * |
| _drbd_fault_str(unsigned int type) { |
| static char *_faults[] = { |
| [DRBD_FAULT_MD_WR] = "Meta-data write", |
| [DRBD_FAULT_MD_RD] = "Meta-data read", |
| [DRBD_FAULT_RS_WR] = "Resync write", |
| [DRBD_FAULT_RS_RD] = "Resync read", |
| [DRBD_FAULT_DT_WR] = "Data write", |
| [DRBD_FAULT_DT_RD] = "Data read", |
| [DRBD_FAULT_DT_RA] = "Data read ahead", |
| [DRBD_FAULT_BM_ALLOC] = "BM allocation", |
| [DRBD_FAULT_AL_EE] = "EE allocation", |
| [DRBD_FAULT_RECEIVE] = "receive data corruption", |
| }; |
| |
| return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**"; |
| } |
| |
| unsigned int |
| _drbd_insert_fault(struct drbd_device *device, unsigned int type) |
| { |
| static struct fault_random_state rrs = {0, 0}; |
| |
| unsigned int ret = ( |
| (drbd_fault_devs == 0 || |
| ((1 << device_to_minor(device)) & drbd_fault_devs) != 0) && |
| (((_drbd_fault_random(&rrs) % 100) + 1) <= drbd_fault_rate)); |
| |
| if (ret) { |
| drbd_fault_count++; |
| |
| if (drbd_ratelimit()) |
| drbd_warn(device, "***Simulating %s failure\n", |
| _drbd_fault_str(type)); |
| } |
| |
| return ret; |
| } |
| #endif |
| |
| module_init(drbd_init) |
| module_exit(drbd_cleanup) |
| |
| EXPORT_SYMBOL(drbd_conn_str); |
| EXPORT_SYMBOL(drbd_role_str); |
| EXPORT_SYMBOL(drbd_disk_str); |
| EXPORT_SYMBOL(drbd_set_st_err_str); |