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3823 lines
109 KiB
3823 lines
109 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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drbd.c |
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|
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This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
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|
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Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. |
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Copyright (C) 1999-2008, Philipp Reisner <[email protected]>. |
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Copyright (C) 2002-2008, Lars Ellenberg <[email protected]>. |
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|
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Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev |
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from Logicworks, Inc. for making SDP replication support possible. |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/module.h> |
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#include <linux/jiffies.h> |
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#include <linux/drbd.h> |
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#include <linux/uaccess.h> |
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#include <asm/types.h> |
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#include <net/sock.h> |
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#include <linux/ctype.h> |
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#include <linux/mutex.h> |
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#include <linux/fs.h> |
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#include <linux/file.h> |
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#include <linux/proc_fs.h> |
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#include <linux/init.h> |
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#include <linux/mm.h> |
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#include <linux/memcontrol.h> |
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#include <linux/mm_inline.h> |
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#include <linux/slab.h> |
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#include <linux/random.h> |
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#include <linux/reboot.h> |
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#include <linux/notifier.h> |
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#include <linux/kthread.h> |
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#include <linux/workqueue.h> |
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#define __KERNEL_SYSCALLS__ |
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#include <linux/unistd.h> |
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#include <linux/vmalloc.h> |
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#include <linux/sched/signal.h> |
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|
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#include <linux/drbd_limits.h> |
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#include "drbd_int.h" |
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#include "drbd_protocol.h" |
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#include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */ |
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#include "drbd_vli.h" |
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#include "drbd_debugfs.h" |
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|
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static DEFINE_MUTEX(drbd_main_mutex); |
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static int drbd_open(struct block_device *bdev, fmode_t mode); |
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static void drbd_release(struct gendisk *gd, fmode_t mode); |
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static void md_sync_timer_fn(struct timer_list *t); |
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static int w_bitmap_io(struct drbd_work *w, int unused); |
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|
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MODULE_AUTHOR("Philipp Reisner <[email protected]>, " |
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"Lars Ellenberg <[email protected]>"); |
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MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION); |
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MODULE_VERSION(REL_VERSION); |
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MODULE_LICENSE("GPL"); |
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MODULE_PARM_DESC(minor_count, "Approximate number of drbd devices (" |
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__stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")"); |
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MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR); |
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|
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#include <linux/moduleparam.h> |
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/* thanks to these macros, if compiled into the kernel (not-module), |
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* these become boot parameters (e.g., drbd.minor_count) */ |
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|
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#ifdef CONFIG_DRBD_FAULT_INJECTION |
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int drbd_enable_faults; |
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int drbd_fault_rate; |
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static int drbd_fault_count; |
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static int drbd_fault_devs; |
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/* bitmap of enabled faults */ |
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module_param_named(enable_faults, drbd_enable_faults, int, 0664); |
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/* fault rate % value - applies to all enabled faults */ |
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module_param_named(fault_rate, drbd_fault_rate, int, 0664); |
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/* count of faults inserted */ |
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module_param_named(fault_count, drbd_fault_count, int, 0664); |
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/* bitmap of devices to insert faults on */ |
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module_param_named(fault_devs, drbd_fault_devs, int, 0644); |
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#endif |
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|
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/* module parameters we can keep static */ |
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static bool drbd_allow_oos; /* allow_open_on_secondary */ |
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static bool drbd_disable_sendpage; |
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MODULE_PARM_DESC(allow_oos, "DONT USE!"); |
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module_param_named(allow_oos, drbd_allow_oos, bool, 0); |
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module_param_named(disable_sendpage, drbd_disable_sendpage, bool, 0644); |
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|
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/* module parameters we share */ |
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int drbd_proc_details; /* Detail level in proc drbd*/ |
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module_param_named(proc_details, drbd_proc_details, int, 0644); |
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/* module parameters shared with defaults */ |
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unsigned int drbd_minor_count = DRBD_MINOR_COUNT_DEF; |
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/* Module parameter for setting the user mode helper program |
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* to run. Default is /sbin/drbdadm */ |
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char drbd_usermode_helper[80] = "/sbin/drbdadm"; |
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module_param_named(minor_count, drbd_minor_count, uint, 0444); |
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module_param_string(usermode_helper, drbd_usermode_helper, sizeof(drbd_usermode_helper), 0644); |
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|
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/* in 2.6.x, our device mapping and config info contains our virtual gendisks |
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* as member "struct gendisk *vdisk;" |
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*/ |
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struct idr drbd_devices; |
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struct list_head drbd_resources; |
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struct mutex resources_mutex; |
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|
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struct kmem_cache *drbd_request_cache; |
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struct kmem_cache *drbd_ee_cache; /* peer requests */ |
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struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ |
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struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ |
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mempool_t drbd_request_mempool; |
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mempool_t drbd_ee_mempool; |
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mempool_t drbd_md_io_page_pool; |
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struct bio_set drbd_md_io_bio_set; |
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struct bio_set drbd_io_bio_set; |
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|
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/* I do not use a standard mempool, because: |
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1) I want to hand out the pre-allocated objects first. |
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2) I want to be able to interrupt sleeping allocation with a signal. |
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Note: This is a single linked list, the next pointer is the private |
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member of struct page. |
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*/ |
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struct page *drbd_pp_pool; |
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DEFINE_SPINLOCK(drbd_pp_lock); |
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int drbd_pp_vacant; |
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wait_queue_head_t drbd_pp_wait; |
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DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5); |
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|
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static const struct block_device_operations drbd_ops = { |
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.owner = THIS_MODULE, |
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.submit_bio = drbd_submit_bio, |
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.open = drbd_open, |
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.release = drbd_release, |
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}; |
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|
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#ifdef __CHECKER__ |
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/* When checking with sparse, and this is an inline function, sparse will |
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give tons of false positives. When this is a real functions sparse works. |
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*/ |
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int _get_ldev_if_state(struct drbd_device *device, enum drbd_disk_state mins) |
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{ |
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int io_allowed; |
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|
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atomic_inc(&device->local_cnt); |
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io_allowed = (device->state.disk >= mins); |
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if (!io_allowed) { |
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if (atomic_dec_and_test(&device->local_cnt)) |
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wake_up(&device->misc_wait); |
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} |
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return io_allowed; |
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} |
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#endif |
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|
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/** |
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* tl_release() - mark as BARRIER_ACKED all requests in the corresponding transfer log epoch |
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* @connection: DRBD connection. |
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* @barrier_nr: Expected identifier of the DRBD write barrier packet. |
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* @set_size: Expected number of requests before that barrier. |
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* |
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* In case the passed barrier_nr or set_size does not match the oldest |
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* epoch of not yet barrier-acked requests, this function will cause a |
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* termination of the connection. |
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*/ |
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void tl_release(struct drbd_connection *connection, unsigned int barrier_nr, |
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unsigned int set_size) |
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{ |
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struct drbd_request *r; |
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struct drbd_request *req = NULL; |
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int expect_epoch = 0; |
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int expect_size = 0; |
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|
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spin_lock_irq(&connection->resource->req_lock); |
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|
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/* find oldest not yet barrier-acked write request, |
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* count writes in its epoch. */ |
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list_for_each_entry(r, &connection->transfer_log, tl_requests) { |
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const unsigned s = r->rq_state; |
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if (!req) { |
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if (!(s & RQ_WRITE)) |
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continue; |
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if (!(s & RQ_NET_MASK)) |
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continue; |
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if (s & RQ_NET_DONE) |
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continue; |
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req = r; |
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expect_epoch = req->epoch; |
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expect_size ++; |
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} else { |
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if (r->epoch != expect_epoch) |
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break; |
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if (!(s & RQ_WRITE)) |
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continue; |
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/* if (s & RQ_DONE): not expected */ |
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/* if (!(s & RQ_NET_MASK)): not expected */ |
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expect_size++; |
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} |
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} |
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|
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/* first some paranoia code */ |
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if (req == NULL) { |
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drbd_err(connection, "BAD! BarrierAck #%u received, but no epoch in tl!?\n", |
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barrier_nr); |
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goto bail; |
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} |
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if (expect_epoch != barrier_nr) { |
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drbd_err(connection, "BAD! BarrierAck #%u received, expected #%u!\n", |
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barrier_nr, expect_epoch); |
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goto bail; |
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} |
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|
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if (expect_size != set_size) { |
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drbd_err(connection, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n", |
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barrier_nr, set_size, expect_size); |
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goto bail; |
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} |
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|
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/* Clean up list of requests processed during current epoch. */ |
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/* this extra list walk restart is paranoia, |
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* to catch requests being barrier-acked "unexpectedly". |
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* It usually should find the same req again, or some READ preceding it. */ |
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list_for_each_entry(req, &connection->transfer_log, tl_requests) |
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if (req->epoch == expect_epoch) |
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break; |
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list_for_each_entry_safe_from(req, r, &connection->transfer_log, tl_requests) { |
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if (req->epoch != expect_epoch) |
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break; |
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_req_mod(req, BARRIER_ACKED); |
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} |
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spin_unlock_irq(&connection->resource->req_lock); |
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return; |
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bail: |
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spin_unlock_irq(&connection->resource->req_lock); |
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conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
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} |
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/** |
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* _tl_restart() - Walks the transfer log, and applies an action to all requests |
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* @connection: DRBD connection to operate on. |
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* @what: The action/event to perform with all request objects |
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* |
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* @what might be one of CONNECTION_LOST_WHILE_PENDING, RESEND, FAIL_FROZEN_DISK_IO, |
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* RESTART_FROZEN_DISK_IO. |
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*/ |
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/* must hold resource->req_lock */ |
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void _tl_restart(struct drbd_connection *connection, enum drbd_req_event what) |
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{ |
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struct drbd_request *req, *r; |
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list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests) |
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_req_mod(req, what); |
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} |
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void tl_restart(struct drbd_connection *connection, enum drbd_req_event what) |
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{ |
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spin_lock_irq(&connection->resource->req_lock); |
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_tl_restart(connection, what); |
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spin_unlock_irq(&connection->resource->req_lock); |
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} |
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/** |
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* tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL |
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* @connection: DRBD connection. |
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* |
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* This is called after the connection to the peer was lost. The storage covered |
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* by the requests on the transfer gets marked as our of sync. Called from the |
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* receiver thread and the worker thread. |
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*/ |
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void tl_clear(struct drbd_connection *connection) |
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{ |
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tl_restart(connection, CONNECTION_LOST_WHILE_PENDING); |
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} |
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/** |
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* tl_abort_disk_io() - Abort disk I/O for all requests for a certain device in the TL |
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* @device: DRBD device. |
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*/ |
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void tl_abort_disk_io(struct drbd_device *device) |
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{ |
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struct drbd_connection *connection = first_peer_device(device)->connection; |
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struct drbd_request *req, *r; |
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spin_lock_irq(&connection->resource->req_lock); |
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list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests) { |
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if (!(req->rq_state & RQ_LOCAL_PENDING)) |
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continue; |
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if (req->device != device) |
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continue; |
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_req_mod(req, ABORT_DISK_IO); |
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} |
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spin_unlock_irq(&connection->resource->req_lock); |
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} |
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static int drbd_thread_setup(void *arg) |
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{ |
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struct drbd_thread *thi = (struct drbd_thread *) arg; |
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struct drbd_resource *resource = thi->resource; |
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unsigned long flags; |
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int retval; |
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snprintf(current->comm, sizeof(current->comm), "drbd_%c_%s", |
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thi->name[0], |
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resource->name); |
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allow_kernel_signal(DRBD_SIGKILL); |
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allow_kernel_signal(SIGXCPU); |
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restart: |
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retval = thi->function(thi); |
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spin_lock_irqsave(&thi->t_lock, flags); |
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|
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/* if the receiver has been "EXITING", the last thing it did |
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* was set the conn state to "StandAlone", |
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* if now a re-connect request comes in, conn state goes C_UNCONNECTED, |
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* and receiver thread will be "started". |
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* drbd_thread_start needs to set "RESTARTING" in that case. |
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* t_state check and assignment needs to be within the same spinlock, |
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* so either thread_start sees EXITING, and can remap to RESTARTING, |
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* or thread_start see NONE, and can proceed as normal. |
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*/ |
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if (thi->t_state == RESTARTING) { |
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drbd_info(resource, "Restarting %s thread\n", thi->name); |
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thi->t_state = RUNNING; |
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spin_unlock_irqrestore(&thi->t_lock, flags); |
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goto restart; |
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} |
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thi->task = NULL; |
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thi->t_state = NONE; |
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smp_mb(); |
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complete_all(&thi->stop); |
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spin_unlock_irqrestore(&thi->t_lock, flags); |
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drbd_info(resource, "Terminating %s\n", current->comm); |
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/* Release mod reference taken when thread was started */ |
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if (thi->connection) |
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kref_put(&thi->connection->kref, drbd_destroy_connection); |
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kref_put(&resource->kref, drbd_destroy_resource); |
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module_put(THIS_MODULE); |
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return retval; |
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} |
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static void drbd_thread_init(struct drbd_resource *resource, struct drbd_thread *thi, |
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int (*func) (struct drbd_thread *), const char *name) |
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{ |
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spin_lock_init(&thi->t_lock); |
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thi->task = NULL; |
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thi->t_state = NONE; |
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thi->function = func; |
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thi->resource = resource; |
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thi->connection = NULL; |
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thi->name = name; |
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} |
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int drbd_thread_start(struct drbd_thread *thi) |
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{ |
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struct drbd_resource *resource = thi->resource; |
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struct task_struct *nt; |
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unsigned long flags; |
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|
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/* is used from state engine doing drbd_thread_stop_nowait, |
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* while holding the req lock irqsave */ |
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spin_lock_irqsave(&thi->t_lock, flags); |
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|
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switch (thi->t_state) { |
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case NONE: |
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drbd_info(resource, "Starting %s thread (from %s [%d])\n", |
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thi->name, current->comm, current->pid); |
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|
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/* Get ref on module for thread - this is released when thread exits */ |
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if (!try_module_get(THIS_MODULE)) { |
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drbd_err(resource, "Failed to get module reference in drbd_thread_start\n"); |
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spin_unlock_irqrestore(&thi->t_lock, flags); |
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return false; |
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} |
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|
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kref_get(&resource->kref); |
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if (thi->connection) |
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kref_get(&thi->connection->kref); |
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init_completion(&thi->stop); |
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thi->reset_cpu_mask = 1; |
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thi->t_state = RUNNING; |
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spin_unlock_irqrestore(&thi->t_lock, flags); |
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flush_signals(current); /* otherw. may get -ERESTARTNOINTR */ |
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nt = kthread_create(drbd_thread_setup, (void *) thi, |
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"drbd_%c_%s", thi->name[0], thi->resource->name); |
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|
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if (IS_ERR(nt)) { |
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drbd_err(resource, "Couldn't start thread\n"); |
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|
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if (thi->connection) |
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kref_put(&thi->connection->kref, drbd_destroy_connection); |
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kref_put(&resource->kref, drbd_destroy_resource); |
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module_put(THIS_MODULE); |
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return false; |
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} |
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spin_lock_irqsave(&thi->t_lock, flags); |
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thi->task = nt; |
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thi->t_state = RUNNING; |
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spin_unlock_irqrestore(&thi->t_lock, flags); |
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wake_up_process(nt); |
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break; |
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case EXITING: |
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thi->t_state = RESTARTING; |
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drbd_info(resource, "Restarting %s thread (from %s [%d])\n", |
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thi->name, current->comm, current->pid); |
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fallthrough; |
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case RUNNING: |
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case RESTARTING: |
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default: |
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spin_unlock_irqrestore(&thi->t_lock, flags); |
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break; |
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} |
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|
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return true; |
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} |
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|
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void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait) |
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{ |
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unsigned long flags; |
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|
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enum drbd_thread_state ns = restart ? RESTARTING : EXITING; |
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|
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/* may be called from state engine, holding the req lock irqsave */ |
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spin_lock_irqsave(&thi->t_lock, flags); |
|
|
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if (thi->t_state == NONE) { |
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spin_unlock_irqrestore(&thi->t_lock, flags); |
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if (restart) |
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drbd_thread_start(thi); |
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return; |
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} |
|
|
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if (thi->t_state != ns) { |
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if (thi->task == NULL) { |
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spin_unlock_irqrestore(&thi->t_lock, flags); |
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return; |
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} |
|
|
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thi->t_state = ns; |
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smp_mb(); |
|
init_completion(&thi->stop); |
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if (thi->task != current) |
|
send_sig(DRBD_SIGKILL, thi->task, 1); |
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} |
|
|
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spin_unlock_irqrestore(&thi->t_lock, flags); |
|
|
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if (wait) |
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wait_for_completion(&thi->stop); |
|
} |
|
|
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int conn_lowest_minor(struct drbd_connection *connection) |
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{ |
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struct drbd_peer_device *peer_device; |
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int vnr = 0, minor = -1; |
|
|
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rcu_read_lock(); |
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peer_device = idr_get_next(&connection->peer_devices, &vnr); |
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if (peer_device) |
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minor = device_to_minor(peer_device->device); |
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rcu_read_unlock(); |
|
|
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return minor; |
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} |
|
|
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#ifdef CONFIG_SMP |
|
/* |
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* drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs |
|
* |
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* Forces all threads of a resource onto the same CPU. This is beneficial for |
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* DRBD's performance. May be overwritten by user's configuration. |
|
*/ |
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static void drbd_calc_cpu_mask(cpumask_var_t *cpu_mask) |
|
{ |
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unsigned int *resources_per_cpu, min_index = ~0; |
|
|
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resources_per_cpu = kcalloc(nr_cpu_ids, sizeof(*resources_per_cpu), |
|
GFP_KERNEL); |
|
if (resources_per_cpu) { |
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struct drbd_resource *resource; |
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unsigned int cpu, min = ~0; |
|
|
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rcu_read_lock(); |
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for_each_resource_rcu(resource, &drbd_resources) { |
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for_each_cpu(cpu, resource->cpu_mask) |
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resources_per_cpu[cpu]++; |
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} |
|
rcu_read_unlock(); |
|
for_each_online_cpu(cpu) { |
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if (resources_per_cpu[cpu] < min) { |
|
min = resources_per_cpu[cpu]; |
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min_index = cpu; |
|
} |
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} |
|
kfree(resources_per_cpu); |
|
} |
|
if (min_index == ~0) { |
|
cpumask_setall(*cpu_mask); |
|
return; |
|
} |
|
cpumask_set_cpu(min_index, *cpu_mask); |
|
} |
|
|
|
/** |
|
* drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread |
|
* @thi: drbd_thread object |
|
* |
|
* call in the "main loop" of _all_ threads, no need for any mutex, current won't die |
|
* prematurely. |
|
*/ |
|
void drbd_thread_current_set_cpu(struct drbd_thread *thi) |
|
{ |
|
struct drbd_resource *resource = thi->resource; |
|
struct task_struct *p = current; |
|
|
|
if (!thi->reset_cpu_mask) |
|
return; |
|
thi->reset_cpu_mask = 0; |
|
set_cpus_allowed_ptr(p, resource->cpu_mask); |
|
} |
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#else |
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#define drbd_calc_cpu_mask(A) ({}) |
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#endif |
|
|
|
/* |
|
* drbd_header_size - size of a packet header |
|
* |
|
* The header size is a multiple of 8, so any payload following the header is |
|
* word aligned on 64-bit architectures. (The bitmap send and receive code |
|
* relies on this.) |
|
*/ |
|
unsigned int drbd_header_size(struct drbd_connection *connection) |
|
{ |
|
if (connection->agreed_pro_version >= 100) { |
|
BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100), 8)); |
|
return sizeof(struct p_header100); |
|
} else { |
|
BUILD_BUG_ON(sizeof(struct p_header80) != |
|
sizeof(struct p_header95)); |
|
BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80), 8)); |
|
return sizeof(struct p_header80); |
|
} |
|
} |
|
|
|
static unsigned int prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size) |
|
{ |
|
h->magic = cpu_to_be32(DRBD_MAGIC); |
|
h->command = cpu_to_be16(cmd); |
|
h->length = cpu_to_be16(size); |
|
return sizeof(struct p_header80); |
|
} |
|
|
|
static unsigned int prepare_header95(struct p_header95 *h, enum drbd_packet cmd, int size) |
|
{ |
|
h->magic = cpu_to_be16(DRBD_MAGIC_BIG); |
|
h->command = cpu_to_be16(cmd); |
|
h->length = cpu_to_be32(size); |
|
return sizeof(struct p_header95); |
|
} |
|
|
|
static unsigned int prepare_header100(struct p_header100 *h, enum drbd_packet cmd, |
|
int size, int vnr) |
|
{ |
|
h->magic = cpu_to_be32(DRBD_MAGIC_100); |
|
h->volume = cpu_to_be16(vnr); |
|
h->command = cpu_to_be16(cmd); |
|
h->length = cpu_to_be32(size); |
|
h->pad = 0; |
|
return sizeof(struct p_header100); |
|
} |
|
|
|
static unsigned int prepare_header(struct drbd_connection *connection, int vnr, |
|
void *buffer, enum drbd_packet cmd, int size) |
|
{ |
|
if (connection->agreed_pro_version >= 100) |
|
return prepare_header100(buffer, cmd, size, vnr); |
|
else if (connection->agreed_pro_version >= 95 && |
|
size > DRBD_MAX_SIZE_H80_PACKET) |
|
return prepare_header95(buffer, cmd, size); |
|
else |
|
return prepare_header80(buffer, cmd, size); |
|
} |
|
|
|
static void *__conn_prepare_command(struct drbd_connection *connection, |
|
struct drbd_socket *sock) |
|
{ |
|
if (!sock->socket) |
|
return NULL; |
|
return sock->sbuf + drbd_header_size(connection); |
|
} |
|
|
|
void *conn_prepare_command(struct drbd_connection *connection, struct drbd_socket *sock) |
|
{ |
|
void *p; |
|
|
|
mutex_lock(&sock->mutex); |
|
p = __conn_prepare_command(connection, sock); |
|
if (!p) |
|
mutex_unlock(&sock->mutex); |
|
|
|
return p; |
|
} |
|
|
|
void *drbd_prepare_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock) |
|
{ |
|
return conn_prepare_command(peer_device->connection, sock); |
|
} |
|
|
|
static int __send_command(struct drbd_connection *connection, int vnr, |
|
struct drbd_socket *sock, enum drbd_packet cmd, |
|
unsigned int header_size, void *data, |
|
unsigned int size) |
|
{ |
|
int msg_flags; |
|
int err; |
|
|
|
/* |
|
* Called with @data == NULL and the size of the data blocks in @size |
|
* for commands that send data blocks. For those commands, omit the |
|
* MSG_MORE flag: this will increase the likelihood that data blocks |
|
* which are page aligned on the sender will end up page aligned on the |
|
* receiver. |
|
*/ |
|
msg_flags = data ? MSG_MORE : 0; |
|
|
|
header_size += prepare_header(connection, vnr, sock->sbuf, cmd, |
|
header_size + size); |
|
err = drbd_send_all(connection, sock->socket, sock->sbuf, header_size, |
|
msg_flags); |
|
if (data && !err) |
|
err = drbd_send_all(connection, sock->socket, data, size, 0); |
|
/* DRBD protocol "pings" are latency critical. |
|
* This is supposed to trigger tcp_push_pending_frames() */ |
|
if (!err && (cmd == P_PING || cmd == P_PING_ACK)) |
|
tcp_sock_set_nodelay(sock->socket->sk); |
|
|
|
return err; |
|
} |
|
|
|
static int __conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock, |
|
enum drbd_packet cmd, unsigned int header_size, |
|
void *data, unsigned int size) |
|
{ |
|
return __send_command(connection, 0, sock, cmd, header_size, data, size); |
|
} |
|
|
|
int conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock, |
|
enum drbd_packet cmd, unsigned int header_size, |
|
void *data, unsigned int size) |
|
{ |
|
int err; |
|
|
|
err = __conn_send_command(connection, sock, cmd, header_size, data, size); |
|
mutex_unlock(&sock->mutex); |
|
return err; |
|
} |
|
|
|
int drbd_send_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock, |
|
enum drbd_packet cmd, unsigned int header_size, |
|
void *data, unsigned int size) |
|
{ |
|
int err; |
|
|
|
err = __send_command(peer_device->connection, peer_device->device->vnr, |
|
sock, cmd, header_size, data, size); |
|
mutex_unlock(&sock->mutex); |
|
return err; |
|
} |
|
|
|
int drbd_send_ping(struct drbd_connection *connection) |
|
{ |
|
struct drbd_socket *sock; |
|
|
|
sock = &connection->meta; |
|
if (!conn_prepare_command(connection, sock)) |
|
return -EIO; |
|
return conn_send_command(connection, sock, P_PING, 0, NULL, 0); |
|
} |
|
|
|
int drbd_send_ping_ack(struct drbd_connection *connection) |
|
{ |
|
struct drbd_socket *sock; |
|
|
|
sock = &connection->meta; |
|
if (!conn_prepare_command(connection, sock)) |
|
return -EIO; |
|
return conn_send_command(connection, sock, P_PING_ACK, 0, NULL, 0); |
|
} |
|
|
|
int drbd_send_sync_param(struct drbd_peer_device *peer_device) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_rs_param_95 *p; |
|
int size; |
|
const int apv = peer_device->connection->agreed_pro_version; |
|
enum drbd_packet cmd; |
|
struct net_conf *nc; |
|
struct disk_conf *dc; |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (!p) |
|
return -EIO; |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(peer_device->connection->net_conf); |
|
|
|
size = apv <= 87 ? sizeof(struct p_rs_param) |
|
: apv == 88 ? sizeof(struct p_rs_param) |
|
+ strlen(nc->verify_alg) + 1 |
|
: apv <= 94 ? sizeof(struct p_rs_param_89) |
|
: /* apv >= 95 */ sizeof(struct p_rs_param_95); |
|
|
|
cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM; |
|
|
|
/* initialize verify_alg and csums_alg */ |
|
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(); |
|
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); |
|
} |
|
} |
|
|
|
/* communicated if (agreed_features & DRBD_FF_WSAME) */ |
|
static void |
|
assign_p_sizes_qlim(struct drbd_device *device, struct p_sizes *p, |
|
struct request_queue *q) |
|
{ |
|
if (q) { |
|
p->qlim->physical_block_size = cpu_to_be32(queue_physical_block_size(q)); |
|
p->qlim->logical_block_size = cpu_to_be32(queue_logical_block_size(q)); |
|
p->qlim->alignment_offset = cpu_to_be32(queue_alignment_offset(q)); |
|
p->qlim->io_min = cpu_to_be32(queue_io_min(q)); |
|
p->qlim->io_opt = cpu_to_be32(queue_io_opt(q)); |
|
p->qlim->discard_enabled = blk_queue_discard(q); |
|
p->qlim->write_same_capable = !!q->limits.max_write_same_sectors; |
|
} else { |
|
q = device->rq_queue; |
|
p->qlim->physical_block_size = cpu_to_be32(queue_physical_block_size(q)); |
|
p->qlim->logical_block_size = cpu_to_be32(queue_logical_block_size(q)); |
|
p->qlim->alignment_offset = 0; |
|
p->qlim->io_min = cpu_to_be32(queue_io_min(q)); |
|
p->qlim->io_opt = cpu_to_be32(queue_io_opt(q)); |
|
p->qlim->discard_enabled = 0; |
|
p->qlim->write_same_capable = 0; |
|
} |
|
} |
|
|
|
int drbd_send_sizes(struct drbd_peer_device *peer_device, int trigger_reply, enum dds_flags flags) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
struct drbd_socket *sock; |
|
struct p_sizes *p; |
|
sector_t d_size, u_size; |
|
int q_order_type; |
|
unsigned int max_bio_size; |
|
unsigned int packet_size; |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (!p) |
|
return -EIO; |
|
|
|
packet_size = sizeof(*p); |
|
if (peer_device->connection->agreed_features & DRBD_FF_WSAME) |
|
packet_size += sizeof(p->qlim[0]); |
|
|
|
memset(p, 0, packet_size); |
|
if (get_ldev_if_state(device, D_NEGOTIATING)) { |
|
struct request_queue *q = bdev_get_queue(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(q) << 9; |
|
max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE); |
|
assign_p_sizes_qlim(device, p, q); |
|
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 */ |
|
assign_p_sizes_qlim(device, p, NULL); |
|
} |
|
|
|
if (peer_device->connection->agreed_pro_version <= 94) |
|
max_bio_size = min(max_bio_size, DRBD_MAX_SIZE_H80_PACKET); |
|
else if (peer_device->connection->agreed_pro_version < 100) |
|
max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE_P95); |
|
|
|
p->d_size = cpu_to_be64(d_size); |
|
p->u_size = cpu_to_be64(u_size); |
|
if (trigger_reply) |
|
p->c_size = 0; |
|
else |
|
p->c_size = cpu_to_be64(get_capacity(device->vdisk)); |
|
p->max_bio_size = cpu_to_be32(max_bio_size); |
|
p->queue_order_type = cpu_to_be16(q_order_type); |
|
p->dds_flags = cpu_to_be16(flags); |
|
|
|
return drbd_send_command(peer_device, sock, P_SIZES, packet_size, NULL, 0); |
|
} |
|
|
|
/** |
|
* drbd_send_current_state() - Sends the drbd state to the peer |
|
* @peer_device: DRBD peer device. |
|
*/ |
|
int drbd_send_current_state(struct drbd_peer_device *peer_device) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_state *p; |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (!p) |
|
return -EIO; |
|
p->state = cpu_to_be32(peer_device->device->state.i); /* Within the send mutex */ |
|
return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0); |
|
} |
|
|
|
/** |
|
* drbd_send_state() - After a state change, sends the new state to the peer |
|
* @peer_device: DRBD peer device. |
|
* @state: the state to send, not necessarily the current state. |
|
* |
|
* Each state change queues an "after_state_ch" work, which will eventually |
|
* send the resulting new state to the peer. If more state changes happen |
|
* between queuing and processing of the after_state_ch work, we still |
|
* want to send each intermediary state in the order it occurred. |
|
*/ |
|
int drbd_send_state(struct drbd_peer_device *peer_device, union drbd_state state) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_state *p; |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (!p) |
|
return -EIO; |
|
p->state = cpu_to_be32(state.i); /* Within the send mutex */ |
|
return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0); |
|
} |
|
|
|
int drbd_send_state_req(struct drbd_peer_device *peer_device, union drbd_state mask, union drbd_state val) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_req_state *p; |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (!p) |
|
return -EIO; |
|
p->mask = cpu_to_be32(mask.i); |
|
p->val = cpu_to_be32(val.i); |
|
return drbd_send_command(peer_device, sock, P_STATE_CHG_REQ, sizeof(*p), NULL, 0); |
|
} |
|
|
|
int conn_send_state_req(struct drbd_connection *connection, union drbd_state mask, union drbd_state val) |
|
{ |
|
enum drbd_packet cmd; |
|
struct drbd_socket *sock; |
|
struct p_req_state *p; |
|
|
|
cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REQ : P_CONN_ST_CHG_REQ; |
|
sock = &connection->data; |
|
p = conn_prepare_command(connection, sock); |
|
if (!p) |
|
return -EIO; |
|
p->mask = cpu_to_be32(mask.i); |
|
p->val = cpu_to_be32(val.i); |
|
return conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0); |
|
} |
|
|
|
void drbd_send_sr_reply(struct drbd_peer_device *peer_device, enum drbd_state_rv retcode) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_req_state_reply *p; |
|
|
|
sock = &peer_device->connection->meta; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (p) { |
|
p->retcode = cpu_to_be32(retcode); |
|
drbd_send_command(peer_device, sock, P_STATE_CHG_REPLY, sizeof(*p), NULL, 0); |
|
} |
|
} |
|
|
|
void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_req_state_reply *p; |
|
enum drbd_packet cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY; |
|
|
|
sock = &connection->meta; |
|
p = conn_prepare_command(connection, sock); |
|
if (p) { |
|
p->retcode = cpu_to_be32(retcode); |
|
conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0); |
|
} |
|
} |
|
|
|
static void dcbp_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code) |
|
{ |
|
BUG_ON(code & ~0xf); |
|
p->encoding = (p->encoding & ~0xf) | code; |
|
} |
|
|
|
static void dcbp_set_start(struct p_compressed_bm *p, int set) |
|
{ |
|
p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0); |
|
} |
|
|
|
static void dcbp_set_pad_bits(struct p_compressed_bm *p, int n) |
|
{ |
|
BUG_ON(n & ~0x7); |
|
p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4); |
|
} |
|
|
|
static int fill_bitmap_rle_bits(struct drbd_device *device, |
|
struct p_compressed_bm *p, |
|
unsigned int size, |
|
struct bm_xfer_ctx *c) |
|
{ |
|
struct bitstream bs; |
|
unsigned long plain_bits; |
|
unsigned long tmp; |
|
unsigned long rl; |
|
unsigned len; |
|
unsigned toggle; |
|
int bits, use_rle; |
|
|
|
/* may we use this feature? */ |
|
rcu_read_lock(); |
|
use_rle = rcu_dereference(first_peer_device(device)->connection->net_conf)->use_rle; |
|
rcu_read_unlock(); |
|
if (!use_rle || first_peer_device(device)->connection->agreed_pro_version < 90) |
|
return 0; |
|
|
|
if (c->bit_offset >= c->bm_bits) |
|
return 0; /* nothing to do. */ |
|
|
|
/* use at most thus many bytes */ |
|
bitstream_init(&bs, p->code, size, 0); |
|
memset(p->code, 0, size); |
|
/* plain bits covered in this code string */ |
|
plain_bits = 0; |
|
|
|
/* p->encoding & 0x80 stores whether the first run length is set. |
|
* bit offset is implicit. |
|
* start with toggle == 2 to be able to tell the first iteration */ |
|
toggle = 2; |
|
|
|
/* see how much plain bits we can stuff into one packet |
|
* using RLE and VLI. */ |
|
do { |
|
tmp = (toggle == 0) ? _drbd_bm_find_next_zero(device, c->bit_offset) |
|
: _drbd_bm_find_next(device, c->bit_offset); |
|
if (tmp == -1UL) |
|
tmp = c->bm_bits; |
|
rl = tmp - c->bit_offset; |
|
|
|
if (toggle == 2) { /* first iteration */ |
|
if (rl == 0) { |
|
/* the first checked bit was set, |
|
* store start value, */ |
|
dcbp_set_start(p, 1); |
|
/* but skip encoding of zero run length */ |
|
toggle = !toggle; |
|
continue; |
|
} |
|
dcbp_set_start(p, 0); |
|
} |
|
|
|
/* paranoia: catch zero runlength. |
|
* can only happen if bitmap is modified while we scan it. */ |
|
if (rl == 0) { |
|
drbd_err(device, "unexpected zero runlength while encoding bitmap " |
|
"t:%u bo:%lu\n", toggle, c->bit_offset); |
|
return -1; |
|
} |
|
|
|
bits = vli_encode_bits(&bs, rl); |
|
if (bits == -ENOBUFS) /* buffer full */ |
|
break; |
|
if (bits <= 0) { |
|
drbd_err(device, "error while encoding bitmap: %d\n", bits); |
|
return 0; |
|
} |
|
|
|
toggle = !toggle; |
|
plain_bits += rl; |
|
c->bit_offset = tmp; |
|
} while (c->bit_offset < c->bm_bits); |
|
|
|
len = bs.cur.b - p->code + !!bs.cur.bit; |
|
|
|
if (plain_bits < (len << 3)) { |
|
/* incompressible with this method. |
|
* we need to rewind both word and bit position. */ |
|
c->bit_offset -= plain_bits; |
|
bm_xfer_ctx_bit_to_word_offset(c); |
|
c->bit_offset = c->word_offset * BITS_PER_LONG; |
|
return 0; |
|
} |
|
|
|
/* RLE + VLI was able to compress it just fine. |
|
* update c->word_offset. */ |
|
bm_xfer_ctx_bit_to_word_offset(c); |
|
|
|
/* store pad_bits */ |
|
dcbp_set_pad_bits(p, (8 - bs.cur.bit) & 0x7); |
|
|
|
return len; |
|
} |
|
|
|
/* |
|
* send_bitmap_rle_or_plain |
|
* |
|
* Return 0 when done, 1 when another iteration is needed, and a negative error |
|
* code upon failure. |
|
*/ |
|
static int |
|
send_bitmap_rle_or_plain(struct drbd_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 |
|
* @peer_device: DRBD peer device. |
|
* @cmd: Packet command code. |
|
* @sector: sector, needs to be in big endian byte order |
|
* @blksize: size in byte, needs to be in big endian byte order |
|
* @block_id: Id, big endian byte order |
|
*/ |
|
static int _drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
|
u64 sector, u32 blksize, u64 block_id) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_block_ack *p; |
|
|
|
if (peer_device->device->state.conn < C_CONNECTED) |
|
return -EIO; |
|
|
|
sock = &peer_device->connection->meta; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (!p) |
|
return -EIO; |
|
p->sector = sector; |
|
p->block_id = block_id; |
|
p->blksize = blksize; |
|
p->seq_num = cpu_to_be32(atomic_inc_return(&peer_device->device->packet_seq)); |
|
return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0); |
|
} |
|
|
|
/* dp->sector and dp->block_id already/still in network byte order, |
|
* data_size is payload size according to dp->head, |
|
* and may need to be corrected for digest size. */ |
|
void drbd_send_ack_dp(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
|
struct p_data *dp, int data_size) |
|
{ |
|
if (peer_device->connection->peer_integrity_tfm) |
|
data_size -= crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm); |
|
_drbd_send_ack(peer_device, cmd, dp->sector, cpu_to_be32(data_size), |
|
dp->block_id); |
|
} |
|
|
|
void drbd_send_ack_rp(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
|
struct p_block_req *rp) |
|
{ |
|
_drbd_send_ack(peer_device, cmd, rp->sector, rp->blksize, rp->block_id); |
|
} |
|
|
|
/** |
|
* drbd_send_ack() - Sends an ack packet |
|
* @peer_device: DRBD peer device |
|
* @cmd: packet command code |
|
* @peer_req: peer request |
|
*/ |
|
int drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
|
struct drbd_peer_request *peer_req) |
|
{ |
|
return _drbd_send_ack(peer_device, cmd, |
|
cpu_to_be64(peer_req->i.sector), |
|
cpu_to_be32(peer_req->i.size), |
|
peer_req->block_id); |
|
} |
|
|
|
/* This function misuses the block_id field to signal if the blocks |
|
* are is sync or not. */ |
|
int drbd_send_ack_ex(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
|
sector_t sector, int blksize, u64 block_id) |
|
{ |
|
return _drbd_send_ack(peer_device, cmd, |
|
cpu_to_be64(sector), |
|
cpu_to_be32(blksize), |
|
cpu_to_be64(block_id)); |
|
} |
|
|
|
int drbd_send_rs_deallocated(struct drbd_peer_device *peer_device, |
|
struct drbd_peer_request *peer_req) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_block_desc *p; |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (!p) |
|
return -EIO; |
|
p->sector = cpu_to_be64(peer_req->i.sector); |
|
p->blksize = cpu_to_be32(peer_req->i.size); |
|
p->pad = 0; |
|
return drbd_send_command(peer_device, sock, P_RS_DEALLOCATED, sizeof(*p), NULL, 0); |
|
} |
|
|
|
int drbd_send_drequest(struct drbd_peer_device *peer_device, int cmd, |
|
sector_t sector, int size, u64 block_id) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_block_req *p; |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (!p) |
|
return -EIO; |
|
p->sector = cpu_to_be64(sector); |
|
p->block_id = block_id; |
|
p->blksize = cpu_to_be32(size); |
|
return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0); |
|
} |
|
|
|
int drbd_send_drequest_csum(struct drbd_peer_device *peer_device, sector_t sector, int size, |
|
void *digest, int digest_size, enum drbd_packet cmd) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_block_req *p; |
|
|
|
/* FIXME: Put the digest into the preallocated socket buffer. */ |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (!p) |
|
return -EIO; |
|
p->sector = cpu_to_be64(sector); |
|
p->block_id = ID_SYNCER /* unused */; |
|
p->blksize = cpu_to_be32(size); |
|
return drbd_send_command(peer_device, sock, cmd, sizeof(*p), digest, digest_size); |
|
} |
|
|
|
int drbd_send_ov_request(struct drbd_peer_device *peer_device, sector_t sector, int size) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_block_req *p; |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (!p) |
|
return -EIO; |
|
p->sector = cpu_to_be64(sector); |
|
p->block_id = ID_SYNCER /* unused */; |
|
p->blksize = cpu_to_be32(size); |
|
return drbd_send_command(peer_device, sock, P_OV_REQUEST, sizeof(*p), NULL, 0); |
|
} |
|
|
|
/* called on sndtimeo |
|
* returns false if we should retry, |
|
* true if we think connection is dead |
|
*/ |
|
static int we_should_drop_the_connection(struct drbd_connection *connection, struct socket *sock) |
|
{ |
|
int drop_it; |
|
/* long elapsed = (long)(jiffies - device->last_received); */ |
|
|
|
drop_it = connection->meta.socket == sock |
|
|| !connection->ack_receiver.task |
|
|| get_t_state(&connection->ack_receiver) != RUNNING |
|
|| connection->cstate < C_WF_REPORT_PARAMS; |
|
|
|
if (drop_it) |
|
return true; |
|
|
|
drop_it = !--connection->ko_count; |
|
if (!drop_it) { |
|
drbd_err(connection, "[%s/%d] sock_sendmsg time expired, ko = %u\n", |
|
current->comm, current->pid, connection->ko_count); |
|
request_ping(connection); |
|
} |
|
|
|
return drop_it; /* && (device->state == R_PRIMARY) */; |
|
} |
|
|
|
static void drbd_update_congested(struct drbd_connection *connection) |
|
{ |
|
struct sock *sk = connection->data.socket->sk; |
|
if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5) |
|
set_bit(NET_CONGESTED, &connection->flags); |
|
} |
|
|
|
/* The idea of sendpage seems to be to put some kind of reference |
|
* to the page into the skb, and to hand it over to the NIC. In |
|
* this process get_page() gets called. |
|
* |
|
* As soon as the page was really sent over the network put_page() |
|
* gets called by some part of the network layer. [ NIC driver? ] |
|
* |
|
* [ get_page() / put_page() increment/decrement the count. If count |
|
* reaches 0 the page will be freed. ] |
|
* |
|
* This works nicely with pages from FSs. |
|
* But this means that in protocol A we might signal IO completion too early! |
|
* |
|
* In order not to corrupt data during a resync we must make sure |
|
* that we do not reuse our own buffer pages (EEs) to early, therefore |
|
* we have the net_ee list. |
|
* |
|
* XFS seems to have problems, still, it submits pages with page_count == 0! |
|
* As a workaround, we disable sendpage on pages |
|
* with page_count == 0 or PageSlab. |
|
*/ |
|
static int _drbd_no_send_page(struct drbd_peer_device *peer_device, struct page *page, |
|
int offset, size_t size, unsigned msg_flags) |
|
{ |
|
struct socket *socket; |
|
void *addr; |
|
int err; |
|
|
|
socket = peer_device->connection->data.socket; |
|
addr = kmap(page) + offset; |
|
err = drbd_send_all(peer_device->connection, socket, addr, size, msg_flags); |
|
kunmap(page); |
|
if (!err) |
|
peer_device->device->send_cnt += size >> 9; |
|
return err; |
|
} |
|
|
|
static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *page, |
|
int offset, size_t size, unsigned msg_flags) |
|
{ |
|
struct socket *socket = peer_device->connection->data.socket; |
|
int len = size; |
|
int err = -EIO; |
|
|
|
/* e.g. XFS meta- & log-data is in slab pages, which have a |
|
* page_count of 0 and/or have PageSlab() set. |
|
* we cannot use send_page for those, as that does get_page(); |
|
* put_page(); and would cause either a VM_BUG directly, or |
|
* __page_cache_release a page that would actually still be referenced |
|
* by someone, leading to some obscure delayed Oops somewhere else. */ |
|
if (drbd_disable_sendpage || !sendpage_ok(page)) |
|
return _drbd_no_send_page(peer_device, page, offset, size, msg_flags); |
|
|
|
msg_flags |= MSG_NOSIGNAL; |
|
drbd_update_congested(peer_device->connection); |
|
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*/); |
|
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; |
|
/* REQ_OP_WRITE_SAME has only one segment */ |
|
if (bio_op(bio) == REQ_OP_WRITE_SAME) |
|
break; |
|
} |
|
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; |
|
/* REQ_OP_WRITE_SAME has only one segment */ |
|
if (bio_op(bio) == REQ_OP_WRITE_SAME) |
|
break; |
|
} |
|
return 0; |
|
} |
|
|
|
static int _drbd_send_zc_ee(struct drbd_peer_device *peer_device, |
|
struct drbd_peer_request *peer_req) |
|
{ |
|
struct page *page = peer_req->pages; |
|
unsigned len = peer_req->i.size; |
|
int err; |
|
|
|
/* hint all but last page with MSG_MORE */ |
|
page_chain_for_each(page) { |
|
unsigned l = min_t(unsigned, len, PAGE_SIZE); |
|
|
|
err = _drbd_send_page(peer_device, page, 0, l, |
|
page_chain_next(page) ? MSG_MORE : 0); |
|
if (err) |
|
return err; |
|
len -= l; |
|
} |
|
return 0; |
|
} |
|
|
|
static u32 bio_flags_to_wire(struct drbd_connection *connection, |
|
struct bio *bio) |
|
{ |
|
if (connection->agreed_pro_version >= 95) |
|
return (bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0) | |
|
(bio->bi_opf & REQ_FUA ? DP_FUA : 0) | |
|
(bio->bi_opf & REQ_PREFLUSH ? DP_FLUSH : 0) | |
|
(bio_op(bio) == REQ_OP_WRITE_SAME ? DP_WSAME : 0) | |
|
(bio_op(bio) == REQ_OP_DISCARD ? DP_DISCARD : 0) | |
|
(bio_op(bio) == REQ_OP_WRITE_ZEROES ? |
|
((connection->agreed_features & DRBD_FF_WZEROES) ? |
|
(DP_ZEROES |(!(bio->bi_opf & REQ_NOUNMAP) ? DP_DISCARD : 0)) |
|
: DP_DISCARD) |
|
: 0); |
|
else |
|
return bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0; |
|
} |
|
|
|
/* Used to send write or TRIM aka REQ_OP_DISCARD requests |
|
* R_PRIMARY -> Peer (P_DATA, P_TRIM) |
|
*/ |
|
int drbd_send_dblock(struct drbd_peer_device *peer_device, struct drbd_request *req) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
struct drbd_socket *sock; |
|
struct p_data *p; |
|
struct p_wsame *wsame = NULL; |
|
void *digest_out; |
|
unsigned int dp_flags = 0; |
|
int digest_size; |
|
int err; |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
digest_size = peer_device->connection->integrity_tfm ? |
|
crypto_shash_digestsize(peer_device->connection->integrity_tfm) : 0; |
|
|
|
if (!p) |
|
return -EIO; |
|
p->sector = cpu_to_be64(req->i.sector); |
|
p->block_id = (unsigned long)req; |
|
p->seq_num = cpu_to_be32(atomic_inc_return(&device->packet_seq)); |
|
dp_flags = bio_flags_to_wire(peer_device->connection, req->master_bio); |
|
if (device->state.conn >= C_SYNC_SOURCE && |
|
device->state.conn <= C_PAUSED_SYNC_T) |
|
dp_flags |= DP_MAY_SET_IN_SYNC; |
|
if (peer_device->connection->agreed_pro_version >= 100) { |
|
if (req->rq_state & RQ_EXP_RECEIVE_ACK) |
|
dp_flags |= DP_SEND_RECEIVE_ACK; |
|
/* During resync, request an explicit write ack, |
|
* even in protocol != C */ |
|
if (req->rq_state & RQ_EXP_WRITE_ACK |
|
|| (dp_flags & DP_MAY_SET_IN_SYNC)) |
|
dp_flags |= DP_SEND_WRITE_ACK; |
|
} |
|
p->dp_flags = cpu_to_be32(dp_flags); |
|
|
|
if (dp_flags & (DP_DISCARD|DP_ZEROES)) { |
|
enum drbd_packet cmd = (dp_flags & DP_ZEROES) ? P_ZEROES : P_TRIM; |
|
struct p_trim *t = (struct p_trim*)p; |
|
t->size = cpu_to_be32(req->i.size); |
|
err = __send_command(peer_device->connection, device->vnr, sock, cmd, sizeof(*t), NULL, 0); |
|
goto out; |
|
} |
|
if (dp_flags & DP_WSAME) { |
|
/* this will only work if DRBD_FF_WSAME is set AND the |
|
* handshake agreed that all nodes and backend devices are |
|
* WRITE_SAME capable and agree on logical_block_size */ |
|
wsame = (struct p_wsame*)p; |
|
digest_out = wsame + 1; |
|
wsame->size = cpu_to_be32(req->i.size); |
|
} else |
|
digest_out = p + 1; |
|
|
|
/* our digest is still only over the payload. |
|
* TRIM does not carry any payload. */ |
|
if (digest_size) |
|
drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest_out); |
|
if (wsame) { |
|
err = |
|
__send_command(peer_device->connection, device->vnr, sock, P_WSAME, |
|
sizeof(*wsame) + digest_size, NULL, |
|
bio_iovec(req->master_bio).bv_len); |
|
} else |
|
err = |
|
__send_command(peer_device->connection, device->vnr, sock, P_DATA, |
|
sizeof(*p) + digest_size, NULL, req->i.size); |
|
if (!err) { |
|
/* For protocol A, we have to memcpy the payload into |
|
* socket buffers, as we may complete right away |
|
* as soon as we handed it over to tcp, at which point the data |
|
* pages may become invalid. |
|
* |
|
* For data-integrity enabled, we copy it as well, so we can be |
|
* sure that even if the bio pages may still be modified, it |
|
* won't change the data on the wire, thus if the digest checks |
|
* out ok after sending on this side, but does not fit on the |
|
* receiving side, we sure have detected corruption elsewhere. |
|
*/ |
|
if (!(req->rq_state & (RQ_EXP_RECEIVE_ACK | RQ_EXP_WRITE_ACK)) || digest_size) |
|
err = _drbd_send_bio(peer_device, req->master_bio); |
|
else |
|
err = _drbd_send_zc_bio(peer_device, req->master_bio); |
|
|
|
/* double check digest, sometimes buffers have been modified in flight. */ |
|
if (digest_size > 0 && digest_size <= 64) { |
|
/* 64 byte, 512 bit, is the largest digest size |
|
* currently supported in kernel crypto. */ |
|
unsigned char digest[64]; |
|
drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest); |
|
if (memcmp(p + 1, digest, digest_size)) { |
|
drbd_warn(device, |
|
"Digest mismatch, buffer modified by upper layers during write: %llus +%u\n", |
|
(unsigned long long)req->i.sector, req->i.size); |
|
} |
|
} /* else if (digest_size > 64) { |
|
... Be noisy about digest too large ... |
|
} */ |
|
} |
|
out: |
|
mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */ |
|
|
|
return err; |
|
} |
|
|
|
/* answer packet, used to send data back for read requests: |
|
* Peer -> (diskless) R_PRIMARY (P_DATA_REPLY) |
|
* C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY) |
|
*/ |
|
int drbd_send_block(struct drbd_peer_device *peer_device, enum drbd_packet cmd, |
|
struct drbd_peer_request *peer_req) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
struct drbd_socket *sock; |
|
struct p_data *p; |
|
int err; |
|
int digest_size; |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
|
|
digest_size = peer_device->connection->integrity_tfm ? |
|
crypto_shash_digestsize(peer_device->connection->integrity_tfm) : 0; |
|
|
|
if (!p) |
|
return -EIO; |
|
p->sector = cpu_to_be64(peer_req->i.sector); |
|
p->block_id = peer_req->block_id; |
|
p->seq_num = 0; /* unused */ |
|
p->dp_flags = 0; |
|
if (digest_size) |
|
drbd_csum_ee(peer_device->connection->integrity_tfm, peer_req, p + 1); |
|
err = __send_command(peer_device->connection, device->vnr, sock, cmd, sizeof(*p) + digest_size, NULL, peer_req->i.size); |
|
if (!err) |
|
err = _drbd_send_zc_ee(peer_device, peer_req); |
|
mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */ |
|
|
|
return err; |
|
} |
|
|
|
int drbd_send_out_of_sync(struct drbd_peer_device *peer_device, struct drbd_request *req) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_block_desc *p; |
|
|
|
sock = &peer_device->connection->data; |
|
p = drbd_prepare_command(peer_device, sock); |
|
if (!p) |
|
return -EIO; |
|
p->sector = cpu_to_be64(req->i.sector); |
|
p->blksize = cpu_to_be32(req->i.size); |
|
return drbd_send_command(peer_device, sock, P_OUT_OF_SYNC, sizeof(*p), NULL, 0); |
|
} |
|
|
|
/* |
|
drbd_send distinguishes two cases: |
|
|
|
Packets sent via the data socket "sock" |
|
and packets sent via the meta data socket "msock" |
|
|
|
sock msock |
|
-----------------+-------------------------+------------------------------ |
|
timeout conf.timeout / 2 conf.timeout / 2 |
|
timeout action send a ping via msock Abort communication |
|
and close all sockets |
|
*/ |
|
|
|
/* |
|
* you must have down()ed the appropriate [m]sock_mutex elsewhere! |
|
*/ |
|
int drbd_send(struct drbd_connection *connection, struct socket *sock, |
|
void *buf, size_t size, unsigned msg_flags) |
|
{ |
|
struct kvec iov = {.iov_base = buf, .iov_len = size}; |
|
struct msghdr msg = {.msg_flags = msg_flags | MSG_NOSIGNAL}; |
|
int rv, sent = 0; |
|
|
|
if (!sock) |
|
return -EBADR; |
|
|
|
/* THINK if (signal_pending) return ... ? */ |
|
|
|
iov_iter_kvec(&msg.msg_iter, WRITE, &iov, 1, size); |
|
|
|
if (sock == connection->data.socket) { |
|
rcu_read_lock(); |
|
connection->ko_count = rcu_dereference(connection->net_conf)->ko_count; |
|
rcu_read_unlock(); |
|
drbd_update_congested(connection); |
|
} |
|
do { |
|
rv = sock_sendmsg(sock, &msg); |
|
if (rv == -EAGAIN) { |
|
if (we_should_drop_the_connection(connection, sock)) |
|
break; |
|
else |
|
continue; |
|
} |
|
if (rv == -EINTR) { |
|
flush_signals(current); |
|
rv = 0; |
|
} |
|
if (rv < 0) |
|
break; |
|
sent += rv; |
|
} while (sent < size); |
|
|
|
if (sock == connection->data.socket) |
|
clear_bit(NET_CONGESTED, &connection->flags); |
|
|
|
if (rv <= 0) { |
|
if (rv != -EAGAIN) { |
|
drbd_err(connection, "%s_sendmsg returned %d\n", |
|
sock == connection->meta.socket ? "msock" : "sock", |
|
rv); |
|
conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD); |
|
} else |
|
conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD); |
|
} |
|
|
|
return sent; |
|
} |
|
|
|
/* |
|
* drbd_send_all - Send an entire buffer |
|
* |
|
* Returns 0 upon success and a negative error value otherwise. |
|
*/ |
|
int drbd_send_all(struct drbd_connection *connection, struct socket *sock, void *buffer, |
|
size_t size, unsigned msg_flags) |
|
{ |
|
int err; |
|
|
|
err = drbd_send(connection, sock, buffer, size, msg_flags); |
|
if (err < 0) |
|
return err; |
|
if (err != size) |
|
return -EIO; |
|
return 0; |
|
} |
|
|
|
static int drbd_open(struct 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 (!drbd_allow_oos) |
|
rv = -EMEDIUMTYPE; |
|
} |
|
|
|
if (!rv) |
|
device->open_cnt++; |
|
spin_unlock_irqrestore(&device->resource->req_lock, flags); |
|
mutex_unlock(&drbd_main_mutex); |
|
|
|
return rv; |
|
} |
|
|
|
static void drbd_release(struct gendisk *gd, fmode_t mode) |
|
{ |
|
struct drbd_device *device = gd->private_data; |
|
mutex_lock(&drbd_main_mutex); |
|
device->open_cnt--; |
|
mutex_unlock(&drbd_main_mutex); |
|
} |
|
|
|
/* need to hold resource->req_lock */ |
|
void drbd_queue_unplug(struct drbd_device *device) |
|
{ |
|
if (device->state.pdsk >= D_INCONSISTENT && device->state.conn >= C_CONNECTED) { |
|
D_ASSERT(device, device->state.role == R_PRIMARY); |
|
if (test_and_clear_bit(UNPLUG_REMOTE, &device->flags)) { |
|
drbd_queue_work_if_unqueued( |
|
&first_peer_device(device)->connection->sender_work, |
|
&device->unplug_work); |
|
} |
|
} |
|
} |
|
|
|
static void drbd_set_defaults(struct drbd_device *device) |
|
{ |
|
/* Beware! The actual layout differs |
|
* between big endian and little endian */ |
|
device->state = (union drbd_dev_state) { |
|
{ .role = R_SECONDARY, |
|
.peer = R_UNKNOWN, |
|
.conn = C_STANDALONE, |
|
.disk = D_DISKLESS, |
|
.pdsk = D_UNKNOWN, |
|
} }; |
|
} |
|
|
|
void drbd_init_set_defaults(struct drbd_device *device) |
|
{ |
|
/* the memset(,0,) did most of this. |
|
* note: only assignments, no allocation in here */ |
|
|
|
drbd_set_defaults(device); |
|
|
|
atomic_set(&device->ap_bio_cnt, 0); |
|
atomic_set(&device->ap_actlog_cnt, 0); |
|
atomic_set(&device->ap_pending_cnt, 0); |
|
atomic_set(&device->rs_pending_cnt, 0); |
|
atomic_set(&device->unacked_cnt, 0); |
|
atomic_set(&device->local_cnt, 0); |
|
atomic_set(&device->pp_in_use_by_net, 0); |
|
atomic_set(&device->rs_sect_in, 0); |
|
atomic_set(&device->rs_sect_ev, 0); |
|
atomic_set(&device->ap_in_flight, 0); |
|
atomic_set(&device->md_io.in_use, 0); |
|
|
|
mutex_init(&device->own_state_mutex); |
|
device->state_mutex = &device->own_state_mutex; |
|
|
|
spin_lock_init(&device->al_lock); |
|
spin_lock_init(&device->peer_seq_lock); |
|
|
|
INIT_LIST_HEAD(&device->active_ee); |
|
INIT_LIST_HEAD(&device->sync_ee); |
|
INIT_LIST_HEAD(&device->done_ee); |
|
INIT_LIST_HEAD(&device->read_ee); |
|
INIT_LIST_HEAD(&device->net_ee); |
|
INIT_LIST_HEAD(&device->resync_reads); |
|
INIT_LIST_HEAD(&device->resync_work.list); |
|
INIT_LIST_HEAD(&device->unplug_work.list); |
|
INIT_LIST_HEAD(&device->bm_io_work.w.list); |
|
INIT_LIST_HEAD(&device->pending_master_completion[0]); |
|
INIT_LIST_HEAD(&device->pending_master_completion[1]); |
|
INIT_LIST_HEAD(&device->pending_completion[0]); |
|
INIT_LIST_HEAD(&device->pending_completion[1]); |
|
|
|
device->resync_work.cb = w_resync_timer; |
|
device->unplug_work.cb = w_send_write_hint; |
|
device->bm_io_work.w.cb = w_bitmap_io; |
|
|
|
timer_setup(&device->resync_timer, resync_timer_fn, 0); |
|
timer_setup(&device->md_sync_timer, md_sync_timer_fn, 0); |
|
timer_setup(&device->start_resync_timer, start_resync_timer_fn, 0); |
|
timer_setup(&device->request_timer, request_timer_fn, 0); |
|
|
|
init_waitqueue_head(&device->misc_wait); |
|
init_waitqueue_head(&device->state_wait); |
|
init_waitqueue_head(&device->ee_wait); |
|
init_waitqueue_head(&device->al_wait); |
|
init_waitqueue_head(&device->seq_wait); |
|
|
|
device->resync_wenr = LC_FREE; |
|
device->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE; |
|
device->local_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE; |
|
} |
|
|
|
void drbd_set_my_capacity(struct drbd_device *device, sector_t size) |
|
{ |
|
char ppb[10]; |
|
|
|
set_capacity_and_notify(device->vdisk, size); |
|
|
|
drbd_info(device, "size = %s (%llu KB)\n", |
|
ppsize(ppb, size>>1), (unsigned long long)size>>1); |
|
} |
|
|
|
void drbd_device_cleanup(struct drbd_device *device) |
|
{ |
|
int i; |
|
if (first_peer_device(device)->connection->receiver.t_state != NONE) |
|
drbd_err(device, "ASSERT FAILED: receiver t_state == %d expected 0.\n", |
|
first_peer_device(device)->connection->receiver.t_state); |
|
|
|
device->al_writ_cnt = |
|
device->bm_writ_cnt = |
|
device->read_cnt = |
|
device->recv_cnt = |
|
device->send_cnt = |
|
device->writ_cnt = |
|
device->p_size = |
|
device->rs_start = |
|
device->rs_total = |
|
device->rs_failed = 0; |
|
device->rs_last_events = 0; |
|
device->rs_last_sect_ev = 0; |
|
for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
|
device->rs_mark_left[i] = 0; |
|
device->rs_mark_time[i] = 0; |
|
} |
|
D_ASSERT(device, first_peer_device(device)->connection->net_conf == NULL); |
|
|
|
set_capacity_and_notify(device->vdisk, 0); |
|
if (device->bitmap) { |
|
/* maybe never allocated. */ |
|
drbd_bm_resize(device, 0, 1); |
|
drbd_bm_cleanup(device); |
|
} |
|
|
|
drbd_backing_dev_free(device, device->ldev); |
|
device->ldev = NULL; |
|
|
|
clear_bit(AL_SUSPENDED, &device->flags); |
|
|
|
D_ASSERT(device, list_empty(&device->active_ee)); |
|
D_ASSERT(device, list_empty(&device->sync_ee)); |
|
D_ASSERT(device, list_empty(&device->done_ee)); |
|
D_ASSERT(device, list_empty(&device->read_ee)); |
|
D_ASSERT(device, list_empty(&device->net_ee)); |
|
D_ASSERT(device, list_empty(&device->resync_reads)); |
|
D_ASSERT(device, list_empty(&first_peer_device(device)->connection->sender_work.q)); |
|
D_ASSERT(device, list_empty(&device->resync_work.list)); |
|
D_ASSERT(device, list_empty(&device->unplug_work.list)); |
|
|
|
drbd_set_defaults(device); |
|
} |
|
|
|
|
|
static void drbd_destroy_mempools(void) |
|
{ |
|
struct page *page; |
|
|
|
while (drbd_pp_pool) { |
|
page = drbd_pp_pool; |
|
drbd_pp_pool = (struct page *)page_private(page); |
|
__free_page(page); |
|
drbd_pp_vacant--; |
|
} |
|
|
|
/* D_ASSERT(device, atomic_read(&drbd_pp_vacant)==0); */ |
|
|
|
bioset_exit(&drbd_io_bio_set); |
|
bioset_exit(&drbd_md_io_bio_set); |
|
mempool_exit(&drbd_md_io_page_pool); |
|
mempool_exit(&drbd_ee_mempool); |
|
mempool_exit(&drbd_request_mempool); |
|
kmem_cache_destroy(drbd_ee_cache); |
|
kmem_cache_destroy(drbd_request_cache); |
|
kmem_cache_destroy(drbd_bm_ext_cache); |
|
kmem_cache_destroy(drbd_al_ext_cache); |
|
|
|
drbd_ee_cache = NULL; |
|
drbd_request_cache = NULL; |
|
drbd_bm_ext_cache = NULL; |
|
drbd_al_ext_cache = NULL; |
|
|
|
return; |
|
} |
|
|
|
static int drbd_create_mempools(void) |
|
{ |
|
struct page *page; |
|
const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count; |
|
int i, ret; |
|
|
|
/* caches */ |
|
drbd_request_cache = kmem_cache_create( |
|
"drbd_req", sizeof(struct drbd_request), 0, 0, NULL); |
|
if (drbd_request_cache == NULL) |
|
goto Enomem; |
|
|
|
drbd_ee_cache = kmem_cache_create( |
|
"drbd_ee", sizeof(struct drbd_peer_request), 0, 0, NULL); |
|
if (drbd_ee_cache == NULL) |
|
goto Enomem; |
|
|
|
drbd_bm_ext_cache = kmem_cache_create( |
|
"drbd_bm", sizeof(struct bm_extent), 0, 0, NULL); |
|
if (drbd_bm_ext_cache == NULL) |
|
goto Enomem; |
|
|
|
drbd_al_ext_cache = kmem_cache_create( |
|
"drbd_al", sizeof(struct lc_element), 0, 0, NULL); |
|
if (drbd_al_ext_cache == NULL) |
|
goto Enomem; |
|
|
|
/* mempools */ |
|
ret = bioset_init(&drbd_io_bio_set, BIO_POOL_SIZE, 0, 0); |
|
if (ret) |
|
goto Enomem; |
|
|
|
ret = bioset_init(&drbd_md_io_bio_set, DRBD_MIN_POOL_PAGES, 0, |
|
BIOSET_NEED_BVECS); |
|
if (ret) |
|
goto Enomem; |
|
|
|
ret = mempool_init_page_pool(&drbd_md_io_page_pool, DRBD_MIN_POOL_PAGES, 0); |
|
if (ret) |
|
goto Enomem; |
|
|
|
ret = mempool_init_slab_pool(&drbd_request_mempool, number, |
|
drbd_request_cache); |
|
if (ret) |
|
goto Enomem; |
|
|
|
ret = mempool_init_slab_pool(&drbd_ee_mempool, number, drbd_ee_cache); |
|
if (ret) |
|
goto Enomem; |
|
|
|
for (i = 0; i < number; i++) { |
|
page = alloc_page(GFP_HIGHUSER); |
|
if (!page) |
|
goto Enomem; |
|
set_page_private(page, (unsigned long)drbd_pp_pool); |
|
drbd_pp_pool = page; |
|
} |
|
drbd_pp_vacant = number; |
|
|
|
return 0; |
|
|
|
Enomem: |
|
drbd_destroy_mempools(); /* in case we allocated some */ |
|
return -ENOMEM; |
|
} |
|
|
|
static void drbd_release_all_peer_reqs(struct drbd_device *device) |
|
{ |
|
int rr; |
|
|
|
rr = drbd_free_peer_reqs(device, &device->active_ee); |
|
if (rr) |
|
drbd_err(device, "%d EEs in active list found!\n", rr); |
|
|
|
rr = drbd_free_peer_reqs(device, &device->sync_ee); |
|
if (rr) |
|
drbd_err(device, "%d EEs in sync list found!\n", rr); |
|
|
|
rr = drbd_free_peer_reqs(device, &device->read_ee); |
|
if (rr) |
|
drbd_err(device, "%d EEs in read list found!\n", rr); |
|
|
|
rr = drbd_free_peer_reqs(device, &device->done_ee); |
|
if (rr) |
|
drbd_err(device, "%d EEs in done list found!\n", rr); |
|
|
|
rr = drbd_free_peer_reqs(device, &device->net_ee); |
|
if (rr) |
|
drbd_err(device, "%d EEs in net list found!\n", rr); |
|
} |
|
|
|
/* caution. no locking. */ |
|
void drbd_destroy_device(struct kref *kref) |
|
{ |
|
struct drbd_device *device = container_of(kref, struct drbd_device, kref); |
|
struct drbd_resource *resource = device->resource; |
|
struct drbd_peer_device *peer_device, *tmp_peer_device; |
|
|
|
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 */ |
|
|
|
drbd_backing_dev_free(device, device->ldev); |
|
device->ldev = NULL; |
|
|
|
drbd_release_all_peer_reqs(device); |
|
|
|
lc_destroy(device->act_log); |
|
lc_destroy(device->resync); |
|
|
|
kfree(device->p_uuid); |
|
/* device->p_uuid = NULL; */ |
|
|
|
if (device->bitmap) /* should no longer be there. */ |
|
drbd_bm_cleanup(device); |
|
__free_page(device->md_io.page); |
|
blk_cleanup_disk(device->vdisk); |
|
kfree(device->rs_plan_s); |
|
|
|
/* not for_each_connection(connection, resource): |
|
* those may have been cleaned up and disassociated already. |
|
*/ |
|
for_each_peer_device_safe(peer_device, tmp_peer_device, device) { |
|
kref_put(&peer_device->connection->kref, drbd_destroy_connection); |
|
kfree(peer_device); |
|
} |
|
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; |
|
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 submit_bio_noacct(), |
|
* as we want to keep the start_time information. */ |
|
inc_ap_bio(device); |
|
__drbd_make_request(device, bio); |
|
} |
|
} |
|
|
|
/* called via drbd_req_put_completion_ref(), |
|
* holds resource->req_lock */ |
|
void drbd_restart_request(struct drbd_request *req) |
|
{ |
|
unsigned long flags; |
|
spin_lock_irqsave(&retry.lock, flags); |
|
list_move_tail(&req->tl_requests, &retry.writes); |
|
spin_unlock_irqrestore(&retry.lock, flags); |
|
|
|
/* Drop the extra reference that would otherwise |
|
* have been dropped by complete_master_bio. |
|
* do_retry() needs to grab a new one. */ |
|
dec_ap_bio(req->device); |
|
|
|
queue_work(retry.wq, &retry.worker); |
|
} |
|
|
|
void drbd_destroy_resource(struct kref *kref) |
|
{ |
|
struct drbd_resource *resource = |
|
container_of(kref, struct drbd_resource, kref); |
|
|
|
idr_destroy(&resource->devices); |
|
free_cpumask_var(resource->cpu_mask); |
|
kfree(resource->name); |
|
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(); |
|
|
|
idr_for_each_entry(&drbd_devices, device, i) |
|
drbd_delete_device(device); |
|
|
|
/* not _rcu since, no other updater anymore. Genl already unregistered */ |
|
for_each_resource_safe(resource, tmp, &drbd_resources) { |
|
list_del(&resource->resources); |
|
drbd_free_resource(resource); |
|
} |
|
|
|
drbd_debugfs_cleanup(); |
|
|
|
drbd_destroy_mempools(); |
|
unregister_blkdev(DRBD_MAJOR, "drbd"); |
|
|
|
idr_destroy(&drbd_devices); |
|
|
|
pr_info("module cleanup done.\n"); |
|
} |
|
|
|
static void drbd_init_workqueue(struct drbd_work_queue* wq) |
|
{ |
|
spin_lock_init(&wq->q_lock); |
|
INIT_LIST_HEAD(&wq->q); |
|
init_waitqueue_head(&wq->q_wait); |
|
} |
|
|
|
struct completion_work { |
|
struct drbd_work w; |
|
struct completion done; |
|
}; |
|
|
|
static int w_complete(struct drbd_work *w, int cancel) |
|
{ |
|
struct completion_work *completion_work = |
|
container_of(w, struct completion_work, w); |
|
|
|
complete(&completion_work->done); |
|
return 0; |
|
} |
|
|
|
void drbd_flush_workqueue(struct drbd_work_queue *work_queue) |
|
{ |
|
struct completion_work completion_work; |
|
|
|
completion_work.w.cb = w_complete; |
|
init_completion(&completion_work.done); |
|
drbd_queue_work(work_queue, &completion_work.w); |
|
wait_for_completion(&completion_work.done); |
|
} |
|
|
|
struct drbd_resource *drbd_find_resource(const char *name) |
|
{ |
|
struct drbd_resource *resource; |
|
|
|
if (!name || !name[0]) |
|
return NULL; |
|
|
|
rcu_read_lock(); |
|
for_each_resource_rcu(resource, &drbd_resources) { |
|
if (!strcmp(resource->name, name)) { |
|
kref_get(&resource->kref); |
|
goto found; |
|
} |
|
} |
|
resource = NULL; |
|
found: |
|
rcu_read_unlock(); |
|
return resource; |
|
} |
|
|
|
struct drbd_connection *conn_get_by_addrs(void *my_addr, int my_addr_len, |
|
void *peer_addr, int peer_addr_len) |
|
{ |
|
struct drbd_resource *resource; |
|
struct drbd_connection *connection; |
|
|
|
rcu_read_lock(); |
|
for_each_resource_rcu(resource, &drbd_resources) { |
|
for_each_connection_rcu(connection, resource) { |
|
if (connection->my_addr_len == my_addr_len && |
|
connection->peer_addr_len == peer_addr_len && |
|
!memcmp(&connection->my_addr, my_addr, my_addr_len) && |
|
!memcmp(&connection->peer_addr, peer_addr, peer_addr_len)) { |
|
kref_get(&connection->kref); |
|
goto found; |
|
} |
|
} |
|
} |
|
connection = NULL; |
|
found: |
|
rcu_read_unlock(); |
|
return connection; |
|
} |
|
|
|
static int drbd_alloc_socket(struct drbd_socket *socket) |
|
{ |
|
socket->rbuf = (void *) __get_free_page(GFP_KERNEL); |
|
if (!socket->rbuf) |
|
return -ENOMEM; |
|
socket->sbuf = (void *) __get_free_page(GFP_KERNEL); |
|
if (!socket->sbuf) |
|
return -ENOMEM; |
|
return 0; |
|
} |
|
|
|
static void drbd_free_socket(struct drbd_socket *socket) |
|
{ |
|
free_page((unsigned long) socket->sbuf); |
|
free_page((unsigned long) socket->rbuf); |
|
} |
|
|
|
void conn_free_crypto(struct drbd_connection *connection) |
|
{ |
|
drbd_free_sock(connection); |
|
|
|
crypto_free_shash(connection->csums_tfm); |
|
crypto_free_shash(connection->verify_tfm); |
|
crypto_free_shash(connection->cram_hmac_tfm); |
|
crypto_free_shash(connection->integrity_tfm); |
|
crypto_free_shash(connection->peer_integrity_tfm); |
|
kfree(connection->int_dig_in); |
|
kfree(connection->int_dig_vv); |
|
|
|
connection->csums_tfm = NULL; |
|
connection->verify_tfm = NULL; |
|
connection->cram_hmac_tfm = NULL; |
|
connection->integrity_tfm = NULL; |
|
connection->peer_integrity_tfm = NULL; |
|
connection->int_dig_in = NULL; |
|
connection->int_dig_vv = NULL; |
|
} |
|
|
|
int set_resource_options(struct drbd_resource *resource, struct res_opts *res_opts) |
|
{ |
|
struct drbd_connection *connection; |
|
cpumask_var_t new_cpu_mask; |
|
int err; |
|
|
|
if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) |
|
return -ENOMEM; |
|
|
|
/* silently ignore cpu mask on UP kernel */ |
|
if (nr_cpu_ids > 1 && res_opts->cpu_mask[0] != 0) { |
|
err = bitmap_parse(res_opts->cpu_mask, DRBD_CPU_MASK_SIZE, |
|
cpumask_bits(new_cpu_mask), nr_cpu_ids); |
|
if (err == -EOVERFLOW) { |
|
/* So what. mask it out. */ |
|
cpumask_var_t tmp_cpu_mask; |
|
if (zalloc_cpumask_var(&tmp_cpu_mask, GFP_KERNEL)) { |
|
cpumask_setall(tmp_cpu_mask); |
|
cpumask_and(new_cpu_mask, new_cpu_mask, tmp_cpu_mask); |
|
drbd_warn(resource, "Overflow in bitmap_parse(%.12s%s), truncating to %u bits\n", |
|
res_opts->cpu_mask, |
|
strlen(res_opts->cpu_mask) > 12 ? "..." : "", |
|
nr_cpu_ids); |
|
free_cpumask_var(tmp_cpu_mask); |
|
err = 0; |
|
} |
|
} |
|
if (err) { |
|
drbd_warn(resource, "bitmap_parse() failed with %d\n", err); |
|
/* retcode = ERR_CPU_MASK_PARSE; */ |
|
goto fail; |
|
} |
|
} |
|
resource->res_opts = *res_opts; |
|
if (cpumask_empty(new_cpu_mask)) |
|
drbd_calc_cpu_mask(&new_cpu_mask); |
|
if (!cpumask_equal(resource->cpu_mask, new_cpu_mask)) { |
|
cpumask_copy(resource->cpu_mask, new_cpu_mask); |
|
for_each_connection_rcu(connection, resource) { |
|
connection->receiver.reset_cpu_mask = 1; |
|
connection->ack_receiver.reset_cpu_mask = 1; |
|
connection->worker.reset_cpu_mask = 1; |
|
} |
|
} |
|
err = 0; |
|
|
|
fail: |
|
free_cpumask_var(new_cpu_mask); |
|
return err; |
|
|
|
} |
|
|
|
struct drbd_resource *drbd_create_resource(const char *name) |
|
{ |
|
struct drbd_resource *resource; |
|
|
|
resource = kzalloc(sizeof(struct drbd_resource), GFP_KERNEL); |
|
if (!resource) |
|
goto fail; |
|
resource->name = kstrdup(name, GFP_KERNEL); |
|
if (!resource->name) |
|
goto fail_free_resource; |
|
if (!zalloc_cpumask_var(&resource->cpu_mask, GFP_KERNEL)) |
|
goto fail_free_name; |
|
kref_init(&resource->kref); |
|
idr_init(&resource->devices); |
|
INIT_LIST_HEAD(&resource->connections); |
|
resource->write_ordering = WO_BDEV_FLUSH; |
|
list_add_tail_rcu(&resource->resources, &drbd_resources); |
|
mutex_init(&resource->conf_update); |
|
mutex_init(&resource->adm_mutex); |
|
spin_lock_init(&resource->req_lock); |
|
drbd_debugfs_resource_add(resource); |
|
return resource; |
|
|
|
fail_free_name: |
|
kfree(resource->name); |
|
fail_free_resource: |
|
kfree(resource); |
|
fail: |
|
return NULL; |
|
} |
|
|
|
/* caller must be under adm_mutex */ |
|
struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts) |
|
{ |
|
struct drbd_resource *resource; |
|
struct drbd_connection *connection; |
|
|
|
connection = kzalloc(sizeof(struct drbd_connection), GFP_KERNEL); |
|
if (!connection) |
|
return NULL; |
|
|
|
if (drbd_alloc_socket(&connection->data)) |
|
goto fail; |
|
if (drbd_alloc_socket(&connection->meta)) |
|
goto fail; |
|
|
|
connection->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL); |
|
if (!connection->current_epoch) |
|
goto fail; |
|
|
|
INIT_LIST_HEAD(&connection->transfer_log); |
|
|
|
INIT_LIST_HEAD(&connection->current_epoch->list); |
|
connection->epochs = 1; |
|
spin_lock_init(&connection->epoch_lock); |
|
|
|
connection->send.seen_any_write_yet = false; |
|
connection->send.current_epoch_nr = 0; |
|
connection->send.current_epoch_writes = 0; |
|
|
|
resource = drbd_create_resource(name); |
|
if (!resource) |
|
goto fail; |
|
|
|
connection->cstate = C_STANDALONE; |
|
mutex_init(&connection->cstate_mutex); |
|
init_waitqueue_head(&connection->ping_wait); |
|
idr_init(&connection->peer_devices); |
|
|
|
drbd_init_workqueue(&connection->sender_work); |
|
mutex_init(&connection->data.mutex); |
|
mutex_init(&connection->meta.mutex); |
|
|
|
drbd_thread_init(resource, &connection->receiver, drbd_receiver, "receiver"); |
|
connection->receiver.connection = connection; |
|
drbd_thread_init(resource, &connection->worker, drbd_worker, "worker"); |
|
connection->worker.connection = connection; |
|
drbd_thread_init(resource, &connection->ack_receiver, drbd_ack_receiver, "ack_recv"); |
|
connection->ack_receiver.connection = connection; |
|
|
|
kref_init(&connection->kref); |
|
|
|
connection->resource = resource; |
|
|
|
if (set_resource_options(resource, res_opts)) |
|
goto fail_resource; |
|
|
|
kref_get(&resource->kref); |
|
list_add_tail_rcu(&connection->connections, &resource->connections); |
|
drbd_debugfs_connection_add(connection); |
|
return connection; |
|
|
|
fail_resource: |
|
list_del(&resource->resources); |
|
drbd_free_resource(resource); |
|
fail: |
|
kfree(connection->current_epoch); |
|
drbd_free_socket(&connection->meta); |
|
drbd_free_socket(&connection->data); |
|
kfree(connection); |
|
return NULL; |
|
} |
|
|
|
void drbd_destroy_connection(struct kref *kref) |
|
{ |
|
struct drbd_connection *connection = container_of(kref, struct drbd_connection, kref); |
|
struct drbd_resource *resource = connection->resource; |
|
|
|
if (atomic_read(&connection->current_epoch->epoch_size) != 0) |
|
drbd_err(connection, "epoch_size:%d\n", atomic_read(&connection->current_epoch->epoch_size)); |
|
kfree(connection->current_epoch); |
|
|
|
idr_destroy(&connection->peer_devices); |
|
|
|
drbd_free_socket(&connection->meta); |
|
drbd_free_socket(&connection->data); |
|
kfree(connection->int_dig_in); |
|
kfree(connection->int_dig_vv); |
|
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_ordered_workqueue("drbd%u_submit", WQ_MEM_RECLAIM, device->minor); |
|
if (!device->submit.wq) |
|
return -ENOMEM; |
|
|
|
INIT_WORK(&device->submit.worker, do_submit); |
|
INIT_LIST_HEAD(&device->submit.writes); |
|
return 0; |
|
} |
|
|
|
enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsigned int minor) |
|
{ |
|
struct drbd_resource *resource = adm_ctx->resource; |
|
struct drbd_connection *connection; |
|
struct drbd_device *device; |
|
struct drbd_peer_device *peer_device, *tmp_peer_device; |
|
struct gendisk *disk; |
|
int id; |
|
int vnr = adm_ctx->volume; |
|
enum drbd_ret_code err = ERR_NOMEM; |
|
|
|
device = minor_to_device(minor); |
|
if (device) |
|
return ERR_MINOR_OR_VOLUME_EXISTS; |
|
|
|
/* GFP_KERNEL, we are outside of all write-out paths */ |
|
device = kzalloc(sizeof(struct drbd_device), GFP_KERNEL); |
|
if (!device) |
|
return ERR_NOMEM; |
|
kref_init(&device->kref); |
|
|
|
kref_get(&resource->kref); |
|
device->resource = resource; |
|
device->minor = minor; |
|
device->vnr = vnr; |
|
|
|
drbd_init_set_defaults(device); |
|
|
|
disk = blk_alloc_disk(NUMA_NO_NODE); |
|
if (!disk) |
|
goto out_no_disk; |
|
|
|
device->vdisk = disk; |
|
device->rq_queue = disk->queue; |
|
|
|
set_disk_ro(disk, true); |
|
|
|
disk->major = DRBD_MAJOR; |
|
disk->first_minor = minor; |
|
disk->minors = 1; |
|
disk->fops = &drbd_ops; |
|
sprintf(disk->disk_name, "drbd%d", minor); |
|
disk->private_data = device; |
|
|
|
blk_queue_write_cache(disk->queue, true, true); |
|
/* 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(disk->queue, DRBD_MAX_BIO_SIZE_SAFE >> 8); |
|
|
|
device->md_io.page = alloc_page(GFP_KERNEL); |
|
if (!device->md_io.page) |
|
goto out_no_io_page; |
|
|
|
if (drbd_bm_init(device)) |
|
goto out_no_bitmap; |
|
device->read_requests = RB_ROOT; |
|
device->write_requests = RB_ROOT; |
|
|
|
id = idr_alloc(&drbd_devices, device, minor, minor + 1, GFP_KERNEL); |
|
if (id < 0) { |
|
if (id == -ENOSPC) |
|
err = ERR_MINOR_OR_VOLUME_EXISTS; |
|
goto out_no_minor_idr; |
|
} |
|
kref_get(&device->kref); |
|
|
|
id = idr_alloc(&resource->devices, device, vnr, vnr + 1, GFP_KERNEL); |
|
if (id < 0) { |
|
if (id == -ENOSPC) |
|
err = ERR_MINOR_OR_VOLUME_EXISTS; |
|
goto out_idr_remove_minor; |
|
} |
|
kref_get(&device->kref); |
|
|
|
INIT_LIST_HEAD(&device->peer_devices); |
|
INIT_LIST_HEAD(&device->pending_bitmap_io); |
|
for_each_connection(connection, resource) { |
|
peer_device = kzalloc(sizeof(struct drbd_peer_device), GFP_KERNEL); |
|
if (!peer_device) |
|
goto out_idr_remove_from_resource; |
|
peer_device->connection = connection; |
|
peer_device->device = device; |
|
|
|
list_add(&peer_device->peer_devices, &device->peer_devices); |
|
kref_get(&device->kref); |
|
|
|
id = idr_alloc(&connection->peer_devices, peer_device, vnr, vnr + 1, GFP_KERNEL); |
|
if (id < 0) { |
|
if (id == -ENOSPC) |
|
err = ERR_INVALID_REQUEST; |
|
goto out_idr_remove_from_resource; |
|
} |
|
kref_get(&connection->kref); |
|
INIT_WORK(&peer_device->send_acks_work, drbd_send_acks_wf); |
|
} |
|
|
|
if (init_submitter(device)) { |
|
err = ERR_NOMEM; |
|
goto out_idr_remove_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_remove(&connection->peer_devices, vnr); |
|
if (peer_device) |
|
kref_put(&connection->kref, drbd_destroy_connection); |
|
} |
|
for_each_peer_device_safe(peer_device, tmp_peer_device, device) { |
|
list_del(&peer_device->peer_devices); |
|
kfree(peer_device); |
|
} |
|
idr_remove(&resource->devices, vnr); |
|
out_idr_remove_minor: |
|
idr_remove(&drbd_devices, minor); |
|
synchronize_rcu(); |
|
out_no_minor_idr: |
|
drbd_bm_cleanup(device); |
|
out_no_bitmap: |
|
__free_page(device->md_io.page); |
|
out_no_io_page: |
|
blk_cleanup_disk(disk); |
|
out_no_disk: |
|
kref_put(&resource->kref, drbd_destroy_resource); |
|
kfree(device); |
|
return err; |
|
} |
|
|
|
void drbd_delete_device(struct drbd_device *device) |
|
{ |
|
struct drbd_resource *resource = device->resource; |
|
struct drbd_connection *connection; |
|
struct drbd_peer_device *peer_device; |
|
|
|
/* move to free_peer_device() */ |
|
for_each_peer_device(peer_device, device) |
|
drbd_debugfs_peer_device_cleanup(peer_device); |
|
drbd_debugfs_device_cleanup(device); |
|
for_each_connection(connection, resource) { |
|
idr_remove(&connection->peer_devices, device->vnr); |
|
kref_put(&device->kref, drbd_destroy_device); |
|
} |
|
idr_remove(&resource->devices, device->vnr); |
|
kref_put(&device->kref, drbd_destroy_device); |
|
idr_remove(&drbd_devices, device_to_minor(device)); |
|
kref_put(&device->kref, drbd_destroy_device); |
|
del_gendisk(device->vdisk); |
|
synchronize_rcu(); |
|
kref_put(&device->kref, drbd_destroy_device); |
|
} |
|
|
|
static int __init drbd_init(void) |
|
{ |
|
int err; |
|
|
|
if (drbd_minor_count < DRBD_MINOR_COUNT_MIN || drbd_minor_count > DRBD_MINOR_COUNT_MAX) { |
|
pr_err("invalid minor_count (%d)\n", drbd_minor_count); |
|
#ifdef MODULE |
|
return -EINVAL; |
|
#else |
|
drbd_minor_count = DRBD_MINOR_COUNT_DEF; |
|
#endif |
|
} |
|
|
|
err = register_blkdev(DRBD_MAJOR, "drbd"); |
|
if (err) { |
|
pr_err("unable to register block device major %d\n", |
|
DRBD_MAJOR); |
|
return err; |
|
} |
|
|
|
/* |
|
* allocate all necessary structs |
|
*/ |
|
init_waitqueue_head(&drbd_pp_wait); |
|
|
|
drbd_proc = NULL; /* play safe for drbd_cleanup */ |
|
idr_init(&drbd_devices); |
|
|
|
mutex_init(&resources_mutex); |
|
INIT_LIST_HEAD(&drbd_resources); |
|
|
|
err = drbd_genl_register(); |
|
if (err) { |
|
pr_err("unable to register generic netlink family\n"); |
|
goto fail; |
|
} |
|
|
|
err = drbd_create_mempools(); |
|
if (err) |
|
goto fail; |
|
|
|
err = -ENOMEM; |
|
drbd_proc = proc_create_single("drbd", S_IFREG | 0444 , NULL, drbd_seq_show); |
|
if (!drbd_proc) { |
|
pr_err("unable to register proc file\n"); |
|
goto fail; |
|
} |
|
|
|
retry.wq = create_singlethread_workqueue("drbd-reissue"); |
|
if (!retry.wq) { |
|
pr_err("unable to create retry workqueue\n"); |
|
goto fail; |
|
} |
|
INIT_WORK(&retry.worker, do_retry); |
|
spin_lock_init(&retry.lock); |
|
INIT_LIST_HEAD(&retry.writes); |
|
|
|
drbd_debugfs_init(); |
|
|
|
pr_info("initialized. " |
|
"Version: " REL_VERSION " (api:%d/proto:%d-%d)\n", |
|
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; |
|
} |
|
|
|
static void drbd_free_one_sock(struct drbd_socket *ds) |
|
{ |
|
struct socket *s; |
|
mutex_lock(&ds->mutex); |
|
s = ds->socket; |
|
ds->socket = NULL; |
|
mutex_unlock(&ds->mutex); |
|
if (s) { |
|
/* so debugfs does not need to mutex_lock() */ |
|
synchronize_rcu(); |
|
kernel_sock_shutdown(s, SHUT_RDWR); |
|
sock_release(s); |
|
} |
|
} |
|
|
|
void drbd_free_sock(struct drbd_connection *connection) |
|
{ |
|
if (connection->data.socket) |
|
drbd_free_one_sock(&connection->data); |
|
if (connection->meta.socket) |
|
drbd_free_one_sock(&connection->meta); |
|
} |
|
|
|
/* meta data management */ |
|
|
|
void conn_md_sync(struct drbd_connection *connection) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
int vnr; |
|
|
|
rcu_read_lock(); |
|
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
|
struct drbd_device *device = peer_device->device; |
|
|
|
kref_get(&device->kref); |
|
rcu_read_unlock(); |
|
drbd_md_sync(device); |
|
kref_put(&device->kref, drbd_destroy_device); |
|
rcu_read_lock(); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
/* aligned 4kByte */ |
|
struct meta_data_on_disk { |
|
u64 la_size_sect; /* last agreed size. */ |
|
u64 uuid[UI_SIZE]; /* UUIDs. */ |
|
u64 device_uuid; |
|
u64 reserved_u64_1; |
|
u32 flags; /* MDF */ |
|
u32 magic; |
|
u32 md_size_sect; |
|
u32 al_offset; /* offset to this block */ |
|
u32 al_nr_extents; /* important for restoring the AL (userspace) */ |
|
/* `-- act_log->nr_elements <-- ldev->dc.al_extents */ |
|
u32 bm_offset; /* offset to the bitmap, from here */ |
|
u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */ |
|
u32 la_peer_max_bio_size; /* last peer max_bio_size */ |
|
|
|
/* see al_tr_number_to_on_disk_sector() */ |
|
u32 al_stripes; |
|
u32 al_stripe_size_4k; |
|
|
|
u8 reserved_u8[4096 - (7*8 + 10*4)]; |
|
} __packed; |
|
|
|
|
|
|
|
void drbd_md_write(struct drbd_device *device, void *b) |
|
{ |
|
struct meta_data_on_disk *buffer = b; |
|
sector_t sector; |
|
int i; |
|
|
|
memset(buffer, 0, sizeof(*buffer)); |
|
|
|
buffer->la_size_sect = cpu_to_be64(get_capacity(device->vdisk)); |
|
for (i = UI_CURRENT; i < UI_SIZE; i++) |
|
buffer->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]); |
|
buffer->flags = cpu_to_be32(device->ldev->md.flags); |
|
buffer->magic = cpu_to_be32(DRBD_MD_MAGIC_84_UNCLEAN); |
|
|
|
buffer->md_size_sect = cpu_to_be32(device->ldev->md.md_size_sect); |
|
buffer->al_offset = cpu_to_be32(device->ldev->md.al_offset); |
|
buffer->al_nr_extents = cpu_to_be32(device->act_log->nr_elements); |
|
buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE); |
|
buffer->device_uuid = cpu_to_be64(device->ldev->md.device_uuid); |
|
|
|
buffer->bm_offset = cpu_to_be32(device->ldev->md.bm_offset); |
|
buffer->la_peer_max_bio_size = cpu_to_be32(device->peer_max_bio_size); |
|
|
|
buffer->al_stripes = cpu_to_be32(device->ldev->md.al_stripes); |
|
buffer->al_stripe_size_4k = cpu_to_be32(device->ldev->md.al_stripe_size_4k); |
|
|
|
D_ASSERT(device, drbd_md_ss(device->ldev) == device->ldev->md.md_offset); |
|
sector = device->ldev->md.md_offset; |
|
|
|
if (drbd_md_sync_page_io(device, device->ldev, sector, REQ_OP_WRITE)) { |
|
/* this was a try anyways ... */ |
|
drbd_err(device, "meta data update failed!\n"); |
|
drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR); |
|
} |
|
} |
|
|
|
/** |
|
* drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set |
|
* @device: DRBD device. |
|
*/ |
|
void drbd_md_sync(struct drbd_device *device) |
|
{ |
|
struct meta_data_on_disk *buffer; |
|
|
|
/* Don't accidentally change the DRBD meta data layout. */ |
|
BUILD_BUG_ON(UI_SIZE != 4); |
|
BUILD_BUG_ON(sizeof(struct meta_data_on_disk) != 4096); |
|
|
|
del_timer(&device->md_sync_timer); |
|
/* timer may be rearmed by drbd_md_mark_dirty() now. */ |
|
if (!test_and_clear_bit(MD_DIRTY, &device->flags)) |
|
return; |
|
|
|
/* We use here D_FAILED and not D_ATTACHING because we try to write |
|
* metadata even if we detach due to a disk failure! */ |
|
if (!get_ldev_if_state(device, D_FAILED)) |
|
return; |
|
|
|
buffer = drbd_md_get_buffer(device, __func__); |
|
if (!buffer) |
|
goto out; |
|
|
|
drbd_md_write(device, buffer); |
|
|
|
/* Update device->ldev->md.la_size_sect, |
|
* since we updated it on metadata. */ |
|
device->ldev->md.la_size_sect = get_capacity(device->vdisk); |
|
|
|
drbd_md_put_buffer(device); |
|
out: |
|
put_ldev(device); |
|
} |
|
|
|
static int check_activity_log_stripe_size(struct drbd_device *device, |
|
struct meta_data_on_disk *on_disk, |
|
struct drbd_md *in_core) |
|
{ |
|
u32 al_stripes = be32_to_cpu(on_disk->al_stripes); |
|
u32 al_stripe_size_4k = be32_to_cpu(on_disk->al_stripe_size_4k); |
|
u64 al_size_4k; |
|
|
|
/* both not set: default to old fixed size activity log */ |
|
if (al_stripes == 0 && al_stripe_size_4k == 0) { |
|
al_stripes = 1; |
|
al_stripe_size_4k = MD_32kB_SECT/8; |
|
} |
|
|
|
/* some paranoia plausibility checks */ |
|
|
|
/* we need both values to be set */ |
|
if (al_stripes == 0 || al_stripe_size_4k == 0) |
|
goto err; |
|
|
|
al_size_4k = (u64)al_stripes * al_stripe_size_4k; |
|
|
|
/* Upper limit of activity log area, to avoid potential overflow |
|
* problems in al_tr_number_to_on_disk_sector(). As right now, more |
|
* than 72 * 4k blocks total only increases the amount of history, |
|
* limiting this arbitrarily to 16 GB is not a real limitation ;-) */ |
|
if (al_size_4k > (16 * 1024 * 1024/4)) |
|
goto err; |
|
|
|
/* Lower limit: we need at least 8 transaction slots (32kB) |
|
* to not break existing setups */ |
|
if (al_size_4k < MD_32kB_SECT/8) |
|
goto err; |
|
|
|
in_core->al_stripe_size_4k = al_stripe_size_4k; |
|
in_core->al_stripes = al_stripes; |
|
in_core->al_size_4k = al_size_4k; |
|
|
|
return 0; |
|
err: |
|
drbd_err(device, "invalid activity log striping: al_stripes=%u, al_stripe_size_4k=%u\n", |
|
al_stripes, al_stripe_size_4k); |
|
return -EINVAL; |
|
} |
|
|
|
static int check_offsets_and_sizes(struct drbd_device *device, struct drbd_backing_dev *bdev) |
|
{ |
|
sector_t capacity = drbd_get_capacity(bdev->md_bdev); |
|
struct drbd_md *in_core = &bdev->md; |
|
s32 on_disk_al_sect; |
|
s32 on_disk_bm_sect; |
|
|
|
/* The on-disk size of the activity log, calculated from offsets, and |
|
* the size of the activity log calculated from the stripe settings, |
|
* should match. |
|
* Though we could relax this a bit: it is ok, if the striped activity log |
|
* fits in the available on-disk activity log size. |
|
* Right now, that would break how resize is implemented. |
|
* TODO: make drbd_determine_dev_size() (and the drbdmeta tool) aware |
|
* of possible unused padding space in the on disk layout. */ |
|
if (in_core->al_offset < 0) { |
|
if (in_core->bm_offset > in_core->al_offset) |
|
goto err; |
|
on_disk_al_sect = -in_core->al_offset; |
|
on_disk_bm_sect = in_core->al_offset - in_core->bm_offset; |
|
} else { |
|
if (in_core->al_offset != MD_4kB_SECT) |
|
goto err; |
|
if (in_core->bm_offset < in_core->al_offset + in_core->al_size_4k * MD_4kB_SECT) |
|
goto err; |
|
|
|
on_disk_al_sect = in_core->bm_offset - MD_4kB_SECT; |
|
on_disk_bm_sect = in_core->md_size_sect - in_core->bm_offset; |
|
} |
|
|
|
/* old fixed size meta data is exactly that: fixed. */ |
|
if (in_core->meta_dev_idx >= 0) { |
|
if (in_core->md_size_sect != MD_128MB_SECT |
|
|| in_core->al_offset != MD_4kB_SECT |
|
|| in_core->bm_offset != MD_4kB_SECT + MD_32kB_SECT |
|
|| in_core->al_stripes != 1 |
|
|| in_core->al_stripe_size_4k != MD_32kB_SECT/8) |
|
goto err; |
|
} |
|
|
|
if (capacity < in_core->md_size_sect) |
|
goto err; |
|
if (capacity - in_core->md_size_sect < drbd_md_first_sector(bdev)) |
|
goto err; |
|
|
|
/* should be aligned, and at least 32k */ |
|
if ((on_disk_al_sect & 7) || (on_disk_al_sect < MD_32kB_SECT)) |
|
goto err; |
|
|
|
/* should fit (for now: exactly) into the available on-disk space; |
|
* overflow prevention is in check_activity_log_stripe_size() above. */ |
|
if (on_disk_al_sect != in_core->al_size_4k * MD_4kB_SECT) |
|
goto err; |
|
|
|
/* again, should be aligned */ |
|
if (in_core->bm_offset & 7) |
|
goto err; |
|
|
|
/* FIXME check for device grow with flex external meta data? */ |
|
|
|
/* can the available bitmap space cover the last agreed device size? */ |
|
if (on_disk_bm_sect < (in_core->la_size_sect+7)/MD_4kB_SECT/8/512) |
|
goto err; |
|
|
|
return 0; |
|
|
|
err: |
|
drbd_err(device, "meta data offsets don't make sense: idx=%d " |
|
"al_s=%u, al_sz4k=%u, al_offset=%d, bm_offset=%d, " |
|
"md_size_sect=%u, la_size=%llu, md_capacity=%llu\n", |
|
in_core->meta_dev_idx, |
|
in_core->al_stripes, in_core->al_stripe_size_4k, |
|
in_core->al_offset, in_core->bm_offset, in_core->md_size_sect, |
|
(unsigned long long)in_core->la_size_sect, |
|
(unsigned long long)capacity); |
|
|
|
return -EINVAL; |
|
} |
|
|
|
|
|
/** |
|
* drbd_md_read() - Reads in the meta data super block |
|
* @device: DRBD device. |
|
* @bdev: Device from which the meta data should be read in. |
|
* |
|
* Return NO_ERROR on success, and an enum drbd_ret_code in case |
|
* something goes wrong. |
|
* |
|
* Called exactly once during drbd_adm_attach(), while still being D_DISKLESS, |
|
* even before @bdev is assigned to @device->ldev. |
|
*/ |
|
int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev) |
|
{ |
|
struct meta_data_on_disk *buffer; |
|
u32 magic, flags; |
|
int i, rv = NO_ERROR; |
|
|
|
if (device->state.disk != D_DISKLESS) |
|
return ERR_DISK_CONFIGURED; |
|
|
|
buffer = drbd_md_get_buffer(device, __func__); |
|
if (!buffer) |
|
return ERR_NOMEM; |
|
|
|
/* First, figure out where our meta data superblock is located, |
|
* and read it. */ |
|
bdev->md.meta_dev_idx = bdev->disk_conf->meta_dev_idx; |
|
bdev->md.md_offset = drbd_md_ss(bdev); |
|
/* Even for (flexible or indexed) external meta data, |
|
* initially restrict us to the 4k superblock for now. |
|
* Affects the paranoia out-of-range access check in drbd_md_sync_page_io(). */ |
|
bdev->md.md_size_sect = 8; |
|
|
|
if (drbd_md_sync_page_io(device, bdev, bdev->md.md_offset, |
|
REQ_OP_READ)) { |
|
/* NOTE: can't do normal error processing here as this is |
|
called BEFORE disk is attached */ |
|
drbd_err(device, "Error while reading metadata.\n"); |
|
rv = ERR_IO_MD_DISK; |
|
goto err; |
|
} |
|
|
|
magic = be32_to_cpu(buffer->magic); |
|
flags = be32_to_cpu(buffer->flags); |
|
if (magic == DRBD_MD_MAGIC_84_UNCLEAN || |
|
(magic == DRBD_MD_MAGIC_08 && !(flags & MDF_AL_CLEAN))) { |
|
/* btw: that's Activity Log clean, not "all" clean. */ |
|
drbd_err(device, "Found unclean meta data. Did you \"drbdadm apply-al\"?\n"); |
|
rv = ERR_MD_UNCLEAN; |
|
goto err; |
|
} |
|
|
|
rv = ERR_MD_INVALID; |
|
if (magic != DRBD_MD_MAGIC_08) { |
|
if (magic == DRBD_MD_MAGIC_07) |
|
drbd_err(device, "Found old (0.7) meta data magic. Did you \"drbdadm create-md\"?\n"); |
|
else |
|
drbd_err(device, "Meta data magic not found. Did you \"drbdadm create-md\"?\n"); |
|
goto err; |
|
} |
|
|
|
if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) { |
|
drbd_err(device, "unexpected bm_bytes_per_bit: %u (expected %u)\n", |
|
be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE); |
|
goto err; |
|
} |
|
|
|
|
|
/* convert to in_core endian */ |
|
bdev->md.la_size_sect = be64_to_cpu(buffer->la_size_sect); |
|
for (i = UI_CURRENT; i < UI_SIZE; i++) |
|
bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]); |
|
bdev->md.flags = be32_to_cpu(buffer->flags); |
|
bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid); |
|
|
|
bdev->md.md_size_sect = be32_to_cpu(buffer->md_size_sect); |
|
bdev->md.al_offset = be32_to_cpu(buffer->al_offset); |
|
bdev->md.bm_offset = be32_to_cpu(buffer->bm_offset); |
|
|
|
if (check_activity_log_stripe_size(device, buffer, &bdev->md)) |
|
goto err; |
|
if (check_offsets_and_sizes(device, bdev)) |
|
goto err; |
|
|
|
if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) { |
|
drbd_err(device, "unexpected bm_offset: %d (expected %d)\n", |
|
be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset); |
|
goto err; |
|
} |
|
if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) { |
|
drbd_err(device, "unexpected md_size: %u (expected %u)\n", |
|
be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect); |
|
goto err; |
|
} |
|
|
|
rv = NO_ERROR; |
|
|
|
spin_lock_irq(&device->resource->req_lock); |
|
if (device->state.conn < C_CONNECTED) { |
|
unsigned int peer; |
|
peer = be32_to_cpu(buffer->la_peer_max_bio_size); |
|
peer = max(peer, DRBD_MAX_BIO_SIZE_SAFE); |
|
device->peer_max_bio_size = peer; |
|
} |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
err: |
|
drbd_md_put_buffer(device); |
|
|
|
return rv; |
|
} |
|
|
|
/** |
|
* drbd_md_mark_dirty() - Mark meta data super block as dirty |
|
* @device: DRBD device. |
|
* |
|
* Call this function if you change anything that should be written to |
|
* the meta-data super block. This function sets MD_DIRTY, and starts a |
|
* timer that ensures that within five seconds you have to call drbd_md_sync(). |
|
*/ |
|
void drbd_md_mark_dirty(struct drbd_device *device) |
|
{ |
|
if (!test_and_set_bit(MD_DIRTY, &device->flags)) |
|
mod_timer(&device->md_sync_timer, jiffies + 5*HZ); |
|
} |
|
|
|
void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local) |
|
{ |
|
int i; |
|
|
|
for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++) |
|
device->ldev->md.uuid[i+1] = device->ldev->md.uuid[i]; |
|
} |
|
|
|
void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local) |
|
{ |
|
if (idx == UI_CURRENT) { |
|
if (device->state.role == R_PRIMARY) |
|
val |= 1; |
|
else |
|
val &= ~((u64)1); |
|
|
|
drbd_set_ed_uuid(device, val); |
|
} |
|
|
|
device->ldev->md.uuid[idx] = val; |
|
drbd_md_mark_dirty(device); |
|
} |
|
|
|
void _drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local) |
|
{ |
|
unsigned long flags; |
|
spin_lock_irqsave(&device->ldev->md.uuid_lock, flags); |
|
__drbd_uuid_set(device, idx, val); |
|
spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags); |
|
} |
|
|
|
void drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local) |
|
{ |
|
unsigned long flags; |
|
spin_lock_irqsave(&device->ldev->md.uuid_lock, flags); |
|
if (device->ldev->md.uuid[idx]) { |
|
drbd_uuid_move_history(device); |
|
device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[idx]; |
|
} |
|
__drbd_uuid_set(device, idx, val); |
|
spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags); |
|
} |
|
|
|
/** |
|
* drbd_uuid_new_current() - Creates a new current UUID |
|
* @device: DRBD device. |
|
* |
|
* Creates a new current UUID, and rotates the old current UUID into |
|
* the bitmap slot. Causes an incremental resync upon next connect. |
|
*/ |
|
void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local) |
|
{ |
|
u64 val; |
|
unsigned long long bm_uuid; |
|
|
|
get_random_bytes(&val, sizeof(u64)); |
|
|
|
spin_lock_irq(&device->ldev->md.uuid_lock); |
|
bm_uuid = device->ldev->md.uuid[UI_BITMAP]; |
|
|
|
if (bm_uuid) |
|
drbd_warn(device, "bm UUID was already set: %llX\n", bm_uuid); |
|
|
|
device->ldev->md.uuid[UI_BITMAP] = device->ldev->md.uuid[UI_CURRENT]; |
|
__drbd_uuid_set(device, UI_CURRENT, val); |
|
spin_unlock_irq(&device->ldev->md.uuid_lock); |
|
|
|
drbd_print_uuids(device, "new current UUID"); |
|
/* get it to stable storage _now_ */ |
|
drbd_md_sync(device); |
|
} |
|
|
|
void drbd_uuid_set_bm(struct drbd_device *device, u64 val) __must_hold(local) |
|
{ |
|
unsigned long flags; |
|
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; |
|
|
|
if (work->flags != BM_LOCKED_CHANGE_ALLOWED) { |
|
int cnt = atomic_read(&device->ap_bio_cnt); |
|
if (cnt) |
|
drbd_err(device, "FIXME: ap_bio_cnt %d, expected 0; queued for '%s'\n", |
|
cnt, work->why); |
|
} |
|
|
|
if (get_ldev(device)) { |
|
drbd_bm_lock(device, work->why, work->flags); |
|
rv = work->io_fn(device); |
|
drbd_bm_unlock(device); |
|
put_ldev(device); |
|
} |
|
|
|
clear_bit_unlock(BITMAP_IO, &device->flags); |
|
wake_up(&device->misc_wait); |
|
|
|
if (work->done) |
|
work->done(device, rv); |
|
|
|
clear_bit(BITMAP_IO_QUEUED, &device->flags); |
|
work->why = NULL; |
|
work->flags = 0; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap |
|
* @device: DRBD device. |
|
* @io_fn: IO callback to be called when bitmap IO is possible |
|
* @done: callback to be called after the bitmap IO was performed |
|
* @why: Descriptive text of the reason for doing the IO |
|
* @flags: Bitmap flags |
|
* |
|
* 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); |
|
/* don't wait for pending application IO if the caller indicates that |
|
* application IO does not conflict anyways. */ |
|
if (flags == BM_LOCKED_CHANGE_ALLOWED || atomic_read(&device->ap_bio_cnt) == 0) { |
|
if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags)) |
|
drbd_queue_work(&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 |
|
* @flags: Bitmap flags |
|
* |
|
* 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) |
|
{ |
|
/* Only suspend io, if some operation is supposed to be locked out */ |
|
const bool do_suspend_io = flags & (BM_DONT_CLEAR|BM_DONT_SET|BM_DONT_TEST); |
|
int rv; |
|
|
|
D_ASSERT(device, current != first_peer_device(device)->connection->worker.task); |
|
|
|
if (do_suspend_io) |
|
drbd_suspend_io(device); |
|
|
|
drbd_bm_lock(device, why, flags); |
|
rv = io_fn(device); |
|
drbd_bm_unlock(device); |
|
|
|
if (do_suspend_io) |
|
drbd_resume_io(device); |
|
|
|
return rv; |
|
} |
|
|
|
void drbd_md_set_flag(struct drbd_device *device, int flag) __must_hold(local) |
|
{ |
|
if ((device->ldev->md.flags & flag) != flag) { |
|
drbd_md_mark_dirty(device); |
|
device->ldev->md.flags |= flag; |
|
} |
|
} |
|
|
|
void drbd_md_clear_flag(struct drbd_device *device, int flag) __must_hold(local) |
|
{ |
|
if ((device->ldev->md.flags & flag) != 0) { |
|
drbd_md_mark_dirty(device); |
|
device->ldev->md.flags &= ~flag; |
|
} |
|
} |
|
int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag) |
|
{ |
|
return (bdev->md.flags & flag) != 0; |
|
} |
|
|
|
static void md_sync_timer_fn(struct timer_list *t) |
|
{ |
|
struct drbd_device *device = from_timer(device, t, md_sync_timer); |
|
drbd_device_post_work(device, MD_SYNC); |
|
} |
|
|
|
const char *cmdname(enum drbd_packet cmd) |
|
{ |
|
/* THINK may need to become several global tables |
|
* when we want to support more than |
|
* one PRO_VERSION */ |
|
static const char *cmdnames[] = { |
|
[P_DATA] = "Data", |
|
[P_WSAME] = "WriteSame", |
|
[P_TRIM] = "Trim", |
|
[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_PROTOCOL_UPDATE] = "protocol_update", |
|
[P_RS_THIN_REQ] = "rs_thin_req", |
|
[P_RS_DEALLOCATED] = "rs_deallocated", |
|
|
|
/* enum drbd_packet, but not commands - obsoleted flags: |
|
* P_MAY_IGNORE |
|
* P_MAX_OPT_CMD |
|
*/ |
|
}; |
|
|
|
/* too big for the array: 0xfffX */ |
|
if (cmd == P_INITIAL_META) |
|
return "InitialMeta"; |
|
if (cmd == P_INITIAL_DATA) |
|
return "InitialData"; |
|
if (cmd == P_CONNECTION_FEATURES) |
|
return "ConnectionFeatures"; |
|
if (cmd >= ARRAY_SIZE(cmdnames)) |
|
return "Unknown"; |
|
return cmdnames[cmd]; |
|
} |
|
|
|
/** |
|
* drbd_wait_misc - wait for a request to make progress |
|
* @device: device associated with the request |
|
* @i: the struct drbd_interval embedded in struct drbd_request or |
|
* struct drbd_peer_request |
|
*/ |
|
int drbd_wait_misc(struct drbd_device *device, struct drbd_interval *i) |
|
{ |
|
struct net_conf *nc; |
|
DEFINE_WAIT(wait); |
|
long timeout; |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(first_peer_device(device)->connection->net_conf); |
|
if (!nc) { |
|
rcu_read_unlock(); |
|
return -ETIMEDOUT; |
|
} |
|
timeout = nc->ko_count ? nc->timeout * HZ / 10 * nc->ko_count : MAX_SCHEDULE_TIMEOUT; |
|
rcu_read_unlock(); |
|
|
|
/* Indicate to wake up device->misc_wait on progress. */ |
|
i->waiting = true; |
|
prepare_to_wait(&device->misc_wait, &wait, TASK_INTERRUPTIBLE); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
timeout = schedule_timeout(timeout); |
|
finish_wait(&device->misc_wait, &wait); |
|
spin_lock_irq(&device->resource->req_lock); |
|
if (!timeout || device->state.conn < C_CONNECTED) |
|
return -ETIMEDOUT; |
|
if (signal_pending(current)) |
|
return -ERESTARTSYS; |
|
return 0; |
|
} |
|
|
|
void lock_all_resources(void) |
|
{ |
|
struct drbd_resource *resource; |
|
int __maybe_unused i = 0; |
|
|
|
mutex_lock(&resources_mutex); |
|
local_irq_disable(); |
|
for_each_resource(resource, &drbd_resources) |
|
spin_lock_nested(&resource->req_lock, i++); |
|
} |
|
|
|
void unlock_all_resources(void) |
|
{ |
|
struct drbd_resource *resource; |
|
|
|
for_each_resource(resource, &drbd_resources) |
|
spin_unlock(&resource->req_lock); |
|
local_irq_enable(); |
|
mutex_unlock(&resources_mutex); |
|
} |
|
|
|
#ifdef CONFIG_DRBD_FAULT_INJECTION |
|
/* Fault insertion support including random number generator shamelessly |
|
* stolen from kernel/rcutorture.c */ |
|
struct fault_random_state { |
|
unsigned long state; |
|
unsigned long count; |
|
}; |
|
|
|
#define FAULT_RANDOM_MULT 39916801 /* prime */ |
|
#define FAULT_RANDOM_ADD 479001701 /* prime */ |
|
#define FAULT_RANDOM_REFRESH 10000 |
|
|
|
/* |
|
* Crude but fast random-number generator. Uses a linear congruential |
|
* generator, with occasional help from get_random_bytes(). |
|
*/ |
|
static unsigned long |
|
_drbd_fault_random(struct fault_random_state *rsp) |
|
{ |
|
long refresh; |
|
|
|
if (!rsp->count--) { |
|
get_random_bytes(&refresh, sizeof(refresh)); |
|
rsp->state += refresh; |
|
rsp->count = FAULT_RANDOM_REFRESH; |
|
} |
|
rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD; |
|
return swahw32(rsp->state); |
|
} |
|
|
|
static char * |
|
_drbd_fault_str(unsigned int type) { |
|
static char *_faults[] = { |
|
[DRBD_FAULT_MD_WR] = "Meta-data write", |
|
[DRBD_FAULT_MD_RD] = "Meta-data read", |
|
[DRBD_FAULT_RS_WR] = "Resync write", |
|
[DRBD_FAULT_RS_RD] = "Resync read", |
|
[DRBD_FAULT_DT_WR] = "Data write", |
|
[DRBD_FAULT_DT_RD] = "Data read", |
|
[DRBD_FAULT_DT_RA] = "Data read ahead", |
|
[DRBD_FAULT_BM_ALLOC] = "BM allocation", |
|
[DRBD_FAULT_AL_EE] = "EE allocation", |
|
[DRBD_FAULT_RECEIVE] = "receive data corruption", |
|
}; |
|
|
|
return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**"; |
|
} |
|
|
|
unsigned int |
|
_drbd_insert_fault(struct drbd_device *device, unsigned int type) |
|
{ |
|
static struct fault_random_state rrs = {0, 0}; |
|
|
|
unsigned int ret = ( |
|
(drbd_fault_devs == 0 || |
|
((1 << device_to_minor(device)) & drbd_fault_devs) != 0) && |
|
(((_drbd_fault_random(&rrs) % 100) + 1) <= drbd_fault_rate)); |
|
|
|
if (ret) { |
|
drbd_fault_count++; |
|
|
|
if (__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);
|
|
|