--- /dev/null
+/*
+ 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.
+
+ drbd is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ drbd is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with drbd; see the file COPYING. If not, write to
+ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/drbd.h>
+#include <asm/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>
+#define __KERNEL_SYSCALLS__
+#include <linux/unistd.h>
+#include <linux/vmalloc.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 block_device *bdev, fmode_t mode);
+static void drbd_release(struct gendisk *gd, fmode_t mode);
+static void md_sync_timer_fn(unsigned long data);
+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>
+/* allow_open_on_secondary */
+MODULE_PARM_DESC(allow_oos, "DONT USE!");
+/* thanks to these macros, if compiled into the kernel (not-module),
+ * this becomes the boot parameter drbd.minor_count */
+module_param(minor_count, uint, 0444);
+module_param(disable_sendpage, bool, 0644);
+module_param(allow_oos, bool, 0);
+module_param(proc_details, int, 0644);
+
+#ifdef CONFIG_DRBD_FAULT_INJECTION
+int enable_faults;
+int fault_rate;
+static int fault_count;
+int fault_devs;
+/* bitmap of enabled faults */
+module_param(enable_faults, int, 0664);
+/* fault rate % value - applies to all enabled faults */
+module_param(fault_rate, int, 0664);
+/* count of faults inserted */
+module_param(fault_count, int, 0664);
+/* bitmap of devices to insert faults on */
+module_param(fault_devs, int, 0644);
+#endif
+
+/* module parameter, defined */
+unsigned int minor_count = DRBD_MINOR_COUNT_DEF;
+bool disable_sendpage;
+bool allow_oos;
+int proc_details; /* Detail level in proc drbd*/
+
+/* Module parameter for setting the user mode helper program
+ * to run. Default is /sbin/drbdadm */
+char usermode_helper[80] = "/sbin/drbdadm";
+
+module_param_string(usermode_helper, usermode_helper, sizeof(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 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;
+
+/* 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;
+spinlock_t 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,
+ .open = drbd_open,
+ .release = drbd_release,
+};
+
+struct bio *bio_alloc_drbd(gfp_t gfp_mask)
+{
+ struct bio *bio;
+
+ if (!drbd_md_io_bio_set)
+ return bio_alloc(gfp_mask, 1);
+
+ bio = bio_alloc_bioset(gfp_mask, 1, drbd_md_io_bio_set);
+ if (!bio)
+ return NULL;
+ return bio;
+}
+
+#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;
+ 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)
+ break;
+ list_for_each_entry_safe_from(req, r, &connection->transfer_log, tl_requests) {
+ if (req->epoch != expect_epoch)
+ break;
+ _req_mod(req, BARRIER_ACKED);
+ }
+ 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_request *req, *r;
+
+ list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests)
+ _req_mod(req, what);
+}
+
+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
+ * @device: DRBD device.
+ *
+ * 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);
+ }
+ 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);
+
+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);
+ /* fall through */
+ 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)
+ force_sig(DRBD_SIGKILL, thi->task);
+ }
+
+ spin_unlock_irqrestore(&thi->t_lock, flags);
+
+ if (wait)
+ wait_for_completion(&thi->stop);
+}
+
+int conn_lowest_minor(struct drbd_connection *connection)
+{
+ struct drbd_peer_device *peer_device;
+ int vnr = 0, minor = -1;
+
+ rcu_read_lock();
+ peer_device = idr_get_next(&connection->peer_devices, &vnr);
+ if (peer_device)
+ minor = device_to_minor(peer_device->device);
+ rcu_read_unlock();
+
+ return minor;
+}
+
+#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 = kzalloc(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
+ * @device: DRBD device.
+ * @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))
+ drbd_tcp_nodelay(sock->socket);
+
+ 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 */
+ memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
+
+ 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();
+ mutex_unlock(&sock->mutex);
+ 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;
+
+ if (get_ldev_if_state(device, D_NEGOTIATING)) {
+ D_ASSERT(device, device->ldev->backing_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(device->ldev->backing_bdev->bd_disk->queue) << 9;
+ max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE);
+ put_ldev(device);
+ } else {
+ d_size = 0;
+ u_size = 0;
+ q_order_type = QUEUE_ORDERED_NONE;
+ max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */
+ }
+
+ sock = &peer_device->connection->data;
+ p = drbd_prepare_command(peer_device, sock);
+ if (!p)
+ return -EIO;
+
+ 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);
+ p->c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(device->this_bdev));
+ 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, sizeof(*p), 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_device *device, struct bm_xfer_ctx *c)
+{
+ struct drbd_socket *sock = &first_peer_device(device)->connection->data;
+ unsigned int header_size = drbd_header_size(first_peer_device(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(first_peer_device(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(first_peer_device(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(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 bm_xfer_ctx c;
+ int err;
+
+ if (!expect(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)) {
+ /* 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(device, &c);
+ } while (err > 0);
+
+ return err == 0;
+}
+
+int drbd_send_bitmap(struct drbd_device *device)
+{
+ struct drbd_socket *sock = &first_peer_device(device)->connection->data;
+ int err = -1;
+
+ mutex_lock(&sock->mutex);
+ if (sock->socket)
+ err = !_drbd_send_bitmap(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
+ * @device: DRBD 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_hash_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
+ * @device: DRBD 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_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->asender.task
+ || get_t_state(&connection->asender) != 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;
+ mm_segment_t oldfs = get_fs();
+ 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 (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
+ return _drbd_no_send_page(peer_device, page, offset, size, msg_flags);
+
+ msg_flags |= MSG_NOSIGNAL;
+ drbd_update_congested(peer_device->connection);
+ set_fs(KERNEL_DS);
+ do {
+ int sent;
+
+ sent = socket->ops->sendpage(socket, page, offset, len, msg_flags);
+ 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*/);
+ set_fs(oldfs);
+ 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, unsigned long bi_rw)
+{
+ if (connection->agreed_pro_version >= 95)
+ return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
+ (bi_rw & REQ_FUA ? DP_FUA : 0) |
+ (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
+ (bi_rw & REQ_DISCARD ? DP_DISCARD : 0);
+ else
+ return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0;
+}
+
+/* Used to send write or TRIM aka REQ_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;
+ 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_hash_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->bi_rw);
+ 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) {
+ 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, P_TRIM, sizeof(*t), NULL, 0);
+ goto out;
+ }
+
+ /* 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, p + 1);
+ 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_hash_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;
+ struct msghdr msg;
+ int rv, sent = 0;
+
+ if (!sock)
+ return -EBADR;
+
+ /* THINK if (signal_pending) return ... ? */
+
+ iov.iov_base = buf;
+ iov.iov_len = size;
+
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = msg_flags | MSG_NOSIGNAL;
+
+ 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 {
+ /* STRANGE
+ * tcp_sendmsg does _not_ use its size parameter at all ?
+ *
+ * -EAGAIN on timeout, -EINTR on signal.
+ */
+/* THINK
+ * do we need to block DRBD_SIG if sock == &meta.socket ??
+ * otherwise wake_asender() might interrupt some send_*Ack !
+ */
+ rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
+ 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;
+ iov.iov_base += rv;
+ iov.iov_len -= 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 block_device *bdev, fmode_t mode)
+{
+ struct drbd_device *device = bdev->bd_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 & FMODE_WRITE)
+ rv = -EROFS;
+ else if (!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, fmode_t mode)
+{
+ struct drbd_device *device = gd->private_data;
+ mutex_lock(&drbd_main_mutex);
+ device->open_cnt--;
+ mutex_unlock(&drbd_main_mutex);
+}
+
+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;
+
+ init_timer(&device->resync_timer);
+ init_timer(&device->md_sync_timer);
+ init_timer(&device->start_resync_timer);
+ init_timer(&device->request_timer);
+ device->resync_timer.function = resync_timer_fn;
+ device->resync_timer.data = (unsigned long) device;
+ device->md_sync_timer.function = md_sync_timer_fn;
+ device->md_sync_timer.data = (unsigned long) device;
+ device->start_resync_timer.function = start_resync_timer_fn;
+ device->start_resync_timer.data = (unsigned long) device;
+ device->request_timer.function = request_timer_fn;
+ device->request_timer.data = (unsigned long) device;
+
+ 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_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);
+
+ drbd_set_my_capacity(device, 0);
+ if (device->bitmap) {
+ /* maybe never allocated. */
+ drbd_bm_resize(device, 0, 1);
+ drbd_bm_cleanup(device);
+ }
+
+ drbd_free_ldev(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); */
+
+ if (drbd_md_io_bio_set)
+ bioset_free(drbd_md_io_bio_set);
+ if (drbd_md_io_page_pool)
+ mempool_destroy(drbd_md_io_page_pool);
+ if (drbd_ee_mempool)
+ mempool_destroy(drbd_ee_mempool);
+ if (drbd_request_mempool)
+ mempool_destroy(drbd_request_mempool);
+ if (drbd_ee_cache)
+ kmem_cache_destroy(drbd_ee_cache);
+ if (drbd_request_cache)
+ kmem_cache_destroy(drbd_request_cache);
+ if (drbd_bm_ext_cache)
+ kmem_cache_destroy(drbd_bm_ext_cache);
+ if (drbd_al_ext_cache)
+ kmem_cache_destroy(drbd_al_ext_cache);
+
+ drbd_md_io_bio_set = NULL;
+ drbd_md_io_page_pool = NULL;
+ drbd_ee_mempool = NULL;
+ drbd_request_mempool = NULL;
+ 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) * minor_count;
+ int i;
+
+ /* prepare our caches and mempools */
+ drbd_request_mempool = NULL;
+ drbd_ee_cache = NULL;
+ drbd_request_cache = NULL;
+ drbd_bm_ext_cache = NULL;
+ drbd_al_ext_cache = NULL;
+ drbd_pp_pool = NULL;
+ drbd_md_io_page_pool = NULL;
+ drbd_md_io_bio_set = NULL;
+
+ /* 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 */
+ drbd_md_io_bio_set = bioset_create(DRBD_MIN_POOL_PAGES, 0);
+ if (drbd_md_io_bio_set == NULL)
+ goto Enomem;
+
+ drbd_md_io_page_pool = mempool_create_page_pool(DRBD_MIN_POOL_PAGES, 0);
+ if (drbd_md_io_page_pool == NULL)
+ goto Enomem;
+
+ drbd_request_mempool = mempool_create_slab_pool(number,
+ drbd_request_cache);
+ if (drbd_request_mempool == NULL)
+ goto Enomem;
+
+ drbd_ee_mempool = mempool_create_slab_pool(number, drbd_ee_cache);
+ if (drbd_ee_mempool == NULL)
+ goto Enomem;
+
+ /* drbd's page pool */
+ spin_lock_init(&drbd_pp_lock);
+
+ 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;
+
+ del_timer_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 */
+
+ if (device->this_bdev)
+ bdput(device->this_bdev);
+
+ drbd_free_ldev(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);
+ blk_cleanup_queue(device->rq_queue);
+ 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);
+ }
+ memset(device, 0xfd, sizeof(*device));
+ 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;
+ unsigned long start_jif = req->start_jif;
+ bool expected;
+
+ expected =
+ expect(atomic_read(&req->completion_ref) == 0) &&
+ expect(req->rq_state & RQ_POSTPONED) &&
+ expect((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 generic_make_request(),
+ * as we want to keep the start_time information. */
+ inc_ap_bio(device);
+ __drbd_make_request(device, bio, start_jif);
+ }
+}
+
+/* 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);
+ memset(resource, 0xf2, sizeof(*resource));
+ 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();
+ drbd_debugfs_cleanup();
+
+ 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_destroy_mempools();
+ unregister_blkdev(DRBD_MAJOR, "drbd");
+
+ idr_destroy(&drbd_devices);
+
+ pr_info("module cleanup done.\n");
+}
+
+/**
+ * drbd_congested() - Callback for the flusher thread
+ * @congested_data: User data
+ * @bdi_bits: Bits the BDI flusher thread is currently interested in
+ *
+ * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
+ */
+static int drbd_congested(void *congested_data, int bdi_bits)
+{
+ struct drbd_device *device = congested_data;
+ struct request_queue *q;
+ char reason = '-';
+ int r = 0;
+
+ if (!may_inc_ap_bio(device)) {
+ /* DRBD has frozen IO */
+ r = bdi_bits;
+ reason = 'd';
+ goto out;
+ }
+
+ if (test_bit(CALLBACK_PENDING, &first_peer_device(device)->connection->flags)) {
+ r |= (1 << BDI_async_congested);
+ /* Without good local data, we would need to read from remote,
+ * and that would need the worker thread as well, which is
+ * currently blocked waiting for that usermode helper to
+ * finish.
+ */
+ if (!get_ldev_if_state(device, D_UP_TO_DATE))
+ r |= (1 << BDI_sync_congested);
+ else
+ put_ldev(device);
+ r &= bdi_bits;
+ reason = 'c';
+ goto out;
+ }
+
+ if (get_ldev(device)) {
+ q = bdev_get_queue(device->ldev->backing_bdev);
+ r = bdi_congested(&q->backing_dev_info, bdi_bits);
+ put_ldev(device);
+ if (r)
+ reason = 'b';
+ }
+
+ if (bdi_bits & (1 << BDI_async_congested) &&
+ test_bit(NET_CONGESTED, &first_peer_device(device)->connection->flags)) {
+ r |= (1 << BDI_async_congested);
+ reason = reason == 'b' ? 'a' : 'n';
+ }
+
+out:
+ device->congestion_reason = reason;
+ return r;
+}
+
+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_hash(connection->csums_tfm);
+ crypto_free_hash(connection->verify_tfm);
+ crypto_free_hash(connection->cram_hmac_tfm);
+ crypto_free_hash(connection->integrity_tfm);
+ crypto_free_hash(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->asender.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->asender, drbd_asender, "asender");
+ connection->asender.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);
+ memset(connection, 0xfc, sizeof(*connection));
+ 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_workqueue("drbd%u_submit",
+ WQ_UNBOUND | WQ_MEM_RECLAIM, 1, 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;
+ struct drbd_device *device;
+ struct drbd_peer_device *peer_device, *tmp_peer_device;
+ struct gendisk *disk;
+ struct request_queue *q;
+ int id;
+ int vnr = adm_ctx->volume;
+ enum drbd_ret_code err = ERR_NOMEM;
+
+ 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);
+
+ q = blk_alloc_queue(GFP_KERNEL);
+ if (!q)
+ goto out_no_q;
+ device->rq_queue = q;
+ q->queuedata = device;
+
+ disk = alloc_disk(1);
+ if (!disk)
+ goto out_no_disk;
+ device->vdisk = disk;
+
+ set_disk_ro(disk, true);
+
+ disk->queue = q;
+ disk->major = DRBD_MAJOR;
+ disk->first_minor = minor;
+ disk->fops = &drbd_ops;
+ sprintf(disk->disk_name, "drbd%d", minor);
+ disk->private_data = device;
+
+ device->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
+ /* we have no partitions. we contain only ourselves. */
+ device->this_bdev->bd_contains = device->this_bdev;
+
+ q->backing_dev_info.congested_fn = drbd_congested;
+ q->backing_dev_info.congested_data = device;
+
+ blk_queue_make_request(q, drbd_make_request);
+ blk_queue_flush(q, REQ_FLUSH | REQ_FUA);
+ /* Setting the max_hw_sectors to an odd value of 8kibyte here
+ This triggers a max_bio_size message upon first attach or connect */
+ blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8);
+ blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
+ blk_queue_merge_bvec(q, drbd_merge_bvec);
+ q->queue_lock = &resource->req_lock;
+
+ 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);
+ }
+
+ if (init_submitter(device)) {
+ err = ERR_NOMEM;
+ goto out_idr_remove_vol;
+ }
+
+ add_disk(disk);
+
+ /* 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_idr_remove_vol:
+ idr_remove(&connection->peer_devices, vnr);
+out_idr_remove_from_resource:
+ for_each_connection(connection, resource) {
+ peer_device = idr_find(&connection->peer_devices, vnr);
+ if (peer_device) {
+ idr_remove(&connection->peer_devices, vnr);
+ 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:
+ blk_cleanup_queue(q);
+out_no_q:
+ 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;
+ int refs = 3;
+
+ /* 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);
+ refs++;
+ }
+ idr_remove(&resource->devices, device->vnr);
+ idr_remove(&drbd_devices, device_to_minor(device));
+ del_gendisk(device->vdisk);
+ synchronize_rcu();
+ kref_sub(&device->kref, refs, drbd_destroy_device);
+}
+
+static int __init drbd_init(void)
+{
+ int err;
+
+ if (minor_count < DRBD_MINOR_COUNT_MIN || minor_count > DRBD_MINOR_COUNT_MAX) {
+ pr_err("invalid minor_count (%d)\n", minor_count);
+#ifdef MODULE
+ return -EINVAL;
+#else
+ 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);
+
+ rwlock_init(&global_state_lock);
+ 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_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
+ 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);
+
+ if (drbd_debugfs_init())
+ pr_notice("failed to initialize debugfs -- will not be available\n");
+
+ pr_info("initialized. "
+ "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
+ API_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;
+}
+
+void drbd_free_ldev(struct drbd_backing_dev *ldev)
+{
+ if (ldev == NULL)
+ return;
+
+ blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+ blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+
+ kfree(ldev->disk_conf);
+ kfree(ldev);
+}
+
+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(drbd_get_capacity(device->this_bdev));
+ 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, 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 = drbd_get_capacity(device->this_bdev);
+
+ 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);
+
+ if (drbd_md_sync_page_io(device, bdev, bdev->md.md_offset, 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().
+ */
+#ifdef DEBUG
+void drbd_md_mark_dirty_(struct drbd_device *device, unsigned int line, const char *func)
+{
+ if (!test_and_set_bit(MD_DIRTY, &device->flags)) {
+ mod_timer(&device->md_sync_timer, jiffies + HZ);
+ device->last_md_mark_dirty.line = line;
+ device->last_md_mark_dirty.func = func;
+ }
+}
+#else
+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);
+}
+#endif
+
+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;
+ if (device->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
+ return;
+
+ spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
+ 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.
+ *
+ * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
+ */
+int drbd_bmio_set_n_write(struct drbd_device *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);
+
+ 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.
+ *
+ * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
+ */
+int drbd_bmio_clear_n_write(struct drbd_device *device) __must_hold(local)
+{
+ drbd_resume_al(device);
+ drbd_bm_clear_all(device);
+ return drbd_bm_write(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;
+
+ D_ASSERT(device, atomic_read(&device->ap_bio_cnt) == 0);
+
+ if (get_ldev(device)) {
+ drbd_bm_lock(device, work->why, work->flags);
+ rv = work->io_fn(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
+ *
+ * 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 *),
+ void (*done)(struct drbd_device *, int),
+ char *why, enum bm_flag flags)
+{
+ D_ASSERT(device, current == first_peer_device(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.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);
+ if (atomic_read(&device->ap_bio_cnt) == 0) {
+ if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags))
+ drbd_queue_work(&first_peer_device(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
+ *
+ * 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 *),
+ char *why, enum bm_flag flags)
+{
+ int rv;
+
+ D_ASSERT(device, current != first_peer_device(device)->connection->worker.task);
+
+ if ((flags & BM_LOCKED_SET_ALLOWED) == 0)
+ drbd_suspend_io(device);
+
+ drbd_bm_lock(device, why, flags);
+ rv = io_fn(device);
+ drbd_bm_unlock(device);
+
+ if ((flags & BM_LOCKED_SET_ALLOWED) == 0)
+ 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(unsigned long data)
+{
+ struct drbd_device *device = (struct drbd_device *) data;
+ 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_SYNC_PARAM89] = "SyncParam89",
+ [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_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_REQ] = "StateChgRequest",
+ [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_COMPRESSED_BITMAP] = "CBitmap",
+ [P_DELAY_PROBE] = "DelayProbe",
+ [P_OUT_OF_SYNC] = "OutOfSync",
+ [P_RETRY_WRITE] = "RetryWrite",
+ [P_RS_CANCEL] = "RSCancel",
+ [P_CONN_ST_CHG_REQ] = "conn_st_chg_req",
+ [P_CONN_ST_CHG_REPLY] = "conn_st_chg_reply",
+ [P_RETRY_WRITE] = "retry_write",
+ [P_PROTOCOL_UPDATE] = "protocol_update",
+
+ /* 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;
+}
+
+#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 = (
+ (fault_devs == 0 ||
+ ((1 << device_to_minor(device)) & fault_devs) != 0) &&
+ (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
+
+ if (ret) {
+ fault_count++;
+
+ if (__ratelimit(&drbd_ratelimit_state))
+ drbd_warn(device, "***Simulating %s failure\n",
+ _drbd_fault_str(type));
+ }
+
+ return ret;
+}
+#endif
+
+const char *drbd_buildtag(void)
+{
+ /* DRBD built from external sources has here a reference to the
+ git hash of the source code. */
+
+ static char buildtag[38] = "\0uilt-in";
+
+ if (buildtag[0] == 0) {
+#ifdef MODULE
+ sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
+#else
+ buildtag[0] = 'b';
+#endif
+ }
+
+ return buildtag;
+}
+
+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);
Code Review / kvmfornfv.git / blobdiff