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4004 lines
108 KiB
C
4004 lines
108 KiB
C
/*
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drbd.c
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This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
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Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
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Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
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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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drbd is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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drbd is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with drbd; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/drbd.h>
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#include <asm/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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#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/drbd_limits.h>
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#include "drbd_int.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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struct after_state_chg_work {
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struct drbd_work w;
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union drbd_state os;
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union drbd_state ns;
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enum chg_state_flags flags;
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struct completion *done;
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};
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static DEFINE_MUTEX(drbd_main_mutex);
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int drbdd_init(struct drbd_thread *);
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int drbd_worker(struct drbd_thread *);
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int drbd_asender(struct drbd_thread *);
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int drbd_init(void);
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static int drbd_open(struct block_device *bdev, fmode_t mode);
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static int drbd_release(struct gendisk *gd, fmode_t mode);
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static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused);
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static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
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union drbd_state ns, enum chg_state_flags flags);
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static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused);
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static void md_sync_timer_fn(unsigned long data);
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static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused);
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static int w_go_diskless(struct drbd_conf *mdev, struct drbd_work *w, int unused);
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MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, "
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"Lars Ellenberg <lars@linbit.com>");
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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, "Maximum number of drbd devices (1-255)");
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MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR);
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#include <linux/moduleparam.h>
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/* allow_open_on_secondary */
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MODULE_PARM_DESC(allow_oos, "DONT USE!");
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/* thanks to these macros, if compiled into the kernel (not-module),
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* this becomes the boot parameter drbd.minor_count */
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module_param(minor_count, uint, 0444);
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module_param(disable_sendpage, bool, 0644);
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module_param(allow_oos, bool, 0);
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module_param(cn_idx, uint, 0444);
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module_param(proc_details, int, 0644);
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#ifdef CONFIG_DRBD_FAULT_INJECTION
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int enable_faults;
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int fault_rate;
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static int fault_count;
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int fault_devs;
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/* bitmap of enabled faults */
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module_param(enable_faults, int, 0664);
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/* fault rate % value - applies to all enabled faults */
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module_param(fault_rate, int, 0664);
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/* count of faults inserted */
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module_param(fault_count, int, 0664);
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/* bitmap of devices to insert faults on */
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module_param(fault_devs, int, 0644);
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#endif
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/* module parameter, defined */
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unsigned int minor_count = 32;
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int disable_sendpage;
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int allow_oos;
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unsigned int cn_idx = CN_IDX_DRBD;
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int proc_details; /* Detail level in proc drbd*/
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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 usermode_helper[80] = "/sbin/drbdadm";
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module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644);
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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 drbd_conf **minor_table;
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struct kmem_cache *drbd_request_cache;
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struct kmem_cache *drbd_ee_cache; /* epoch entries */
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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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/* 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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spinlock_t 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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static const struct block_device_operations drbd_ops = {
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.owner = THIS_MODULE,
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.open = drbd_open,
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.release = drbd_release,
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};
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#define ARRY_SIZE(A) (sizeof(A)/sizeof(A[0]))
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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_conf *mdev, enum drbd_disk_state mins)
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{
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int io_allowed;
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atomic_inc(&mdev->local_cnt);
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io_allowed = (mdev->state.disk >= mins);
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if (!io_allowed) {
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if (atomic_dec_and_test(&mdev->local_cnt))
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wake_up(&mdev->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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* DOC: The transfer log
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*
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* The transfer log is a single linked list of &struct drbd_tl_epoch objects.
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* mdev->newest_tle points to the head, mdev->oldest_tle points to the tail
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* of the list. There is always at least one &struct drbd_tl_epoch object.
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*
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* Each &struct drbd_tl_epoch has a circular double linked list of requests
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* attached.
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*/
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static int tl_init(struct drbd_conf *mdev)
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{
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struct drbd_tl_epoch *b;
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/* during device minor initialization, we may well use GFP_KERNEL */
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b = kmalloc(sizeof(struct drbd_tl_epoch), GFP_KERNEL);
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if (!b)
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return 0;
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INIT_LIST_HEAD(&b->requests);
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INIT_LIST_HEAD(&b->w.list);
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b->next = NULL;
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b->br_number = 4711;
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b->n_writes = 0;
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b->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
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mdev->oldest_tle = b;
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mdev->newest_tle = b;
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INIT_LIST_HEAD(&mdev->out_of_sequence_requests);
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mdev->tl_hash = NULL;
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mdev->tl_hash_s = 0;
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return 1;
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}
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static void tl_cleanup(struct drbd_conf *mdev)
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{
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D_ASSERT(mdev->oldest_tle == mdev->newest_tle);
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D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
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kfree(mdev->oldest_tle);
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mdev->oldest_tle = NULL;
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kfree(mdev->unused_spare_tle);
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mdev->unused_spare_tle = NULL;
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kfree(mdev->tl_hash);
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mdev->tl_hash = NULL;
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mdev->tl_hash_s = 0;
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}
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/**
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* _tl_add_barrier() - Adds a barrier to the transfer log
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* @mdev: DRBD device.
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* @new: Barrier to be added before the current head of the TL.
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*
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* The caller must hold the req_lock.
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*/
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void _tl_add_barrier(struct drbd_conf *mdev, struct drbd_tl_epoch *new)
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{
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struct drbd_tl_epoch *newest_before;
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INIT_LIST_HEAD(&new->requests);
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INIT_LIST_HEAD(&new->w.list);
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new->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
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new->next = NULL;
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new->n_writes = 0;
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newest_before = mdev->newest_tle;
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/* never send a barrier number == 0, because that is special-cased
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* when using TCQ for our write ordering code */
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new->br_number = (newest_before->br_number+1) ?: 1;
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if (mdev->newest_tle != new) {
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mdev->newest_tle->next = new;
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mdev->newest_tle = new;
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}
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}
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/**
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* tl_release() - Free or recycle the oldest &struct drbd_tl_epoch object of the TL
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* @mdev: DRBD device.
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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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* &struct drbd_tl_epoch objects this function will cause a termination
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* of the connection.
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*/
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void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr,
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unsigned int set_size)
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{
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struct drbd_tl_epoch *b, *nob; /* next old barrier */
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struct list_head *le, *tle;
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struct drbd_request *r;
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spin_lock_irq(&mdev->req_lock);
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b = mdev->oldest_tle;
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/* first some paranoia code */
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if (b == NULL) {
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dev_err(DEV, "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 (b->br_number != barrier_nr) {
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dev_err(DEV, "BAD! BarrierAck #%u received, expected #%u!\n",
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barrier_nr, b->br_number);
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goto bail;
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}
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if (b->n_writes != set_size) {
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dev_err(DEV, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n",
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barrier_nr, set_size, b->n_writes);
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goto bail;
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}
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/* Clean up list of requests processed during current epoch */
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list_for_each_safe(le, tle, &b->requests) {
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r = list_entry(le, struct drbd_request, tl_requests);
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_req_mod(r, barrier_acked);
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}
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/* There could be requests on the list waiting for completion
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of the write to the local disk. To avoid corruptions of
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slab's data structures we have to remove the lists head.
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Also there could have been a barrier ack out of sequence, overtaking
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the write acks - which would be a bug and violating write ordering.
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To not deadlock in case we lose connection while such requests are
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still pending, we need some way to find them for the
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_req_mode(connection_lost_while_pending).
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These have been list_move'd to the out_of_sequence_requests list in
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_req_mod(, barrier_acked) above.
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*/
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list_del_init(&b->requests);
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nob = b->next;
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if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) {
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_tl_add_barrier(mdev, b);
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if (nob)
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mdev->oldest_tle = nob;
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/* if nob == NULL b was the only barrier, and becomes the new
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barrier. Therefore mdev->oldest_tle points already to b */
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} else {
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D_ASSERT(nob != NULL);
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mdev->oldest_tle = nob;
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kfree(b);
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}
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spin_unlock_irq(&mdev->req_lock);
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dec_ap_pending(mdev);
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return;
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bail:
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spin_unlock_irq(&mdev->req_lock);
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drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
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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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* @mdev: DRBD device.
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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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static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
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{
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struct drbd_tl_epoch *b, *tmp, **pn;
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struct list_head *le, *tle, carry_reads;
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struct drbd_request *req;
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int rv, n_writes, n_reads;
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b = mdev->oldest_tle;
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pn = &mdev->oldest_tle;
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while (b) {
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n_writes = 0;
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n_reads = 0;
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INIT_LIST_HEAD(&carry_reads);
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list_for_each_safe(le, tle, &b->requests) {
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req = list_entry(le, struct drbd_request, tl_requests);
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rv = _req_mod(req, what);
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n_writes += (rv & MR_WRITE) >> MR_WRITE_SHIFT;
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n_reads += (rv & MR_READ) >> MR_READ_SHIFT;
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}
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tmp = b->next;
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if (n_writes) {
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if (what == resend) {
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b->n_writes = n_writes;
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if (b->w.cb == NULL) {
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b->w.cb = w_send_barrier;
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inc_ap_pending(mdev);
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set_bit(CREATE_BARRIER, &mdev->flags);
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}
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drbd_queue_work(&mdev->data.work, &b->w);
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}
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pn = &b->next;
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} else {
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if (n_reads)
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list_add(&carry_reads, &b->requests);
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/* there could still be requests on that ring list,
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* in case local io is still pending */
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list_del(&b->requests);
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/* dec_ap_pending corresponding to queue_barrier.
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* the newest barrier may not have been queued yet,
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* in which case w.cb is still NULL. */
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if (b->w.cb != NULL)
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dec_ap_pending(mdev);
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if (b == mdev->newest_tle) {
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/* recycle, but reinit! */
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D_ASSERT(tmp == NULL);
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INIT_LIST_HEAD(&b->requests);
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list_splice(&carry_reads, &b->requests);
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INIT_LIST_HEAD(&b->w.list);
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b->w.cb = NULL;
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b->br_number = net_random();
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b->n_writes = 0;
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*pn = b;
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break;
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}
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*pn = tmp;
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kfree(b);
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}
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b = tmp;
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list_splice(&carry_reads, &b->requests);
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}
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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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* @mdev: DRBD device.
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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_conf *mdev)
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{
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struct list_head *le, *tle;
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struct drbd_request *r;
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spin_lock_irq(&mdev->req_lock);
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_tl_restart(mdev, connection_lost_while_pending);
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/* we expect this list to be empty. */
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D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
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/* but just in case, clean it up anyways! */
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list_for_each_safe(le, tle, &mdev->out_of_sequence_requests) {
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r = list_entry(le, struct drbd_request, tl_requests);
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/* It would be nice to complete outside of spinlock.
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* But this is easier for now. */
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_req_mod(r, connection_lost_while_pending);
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}
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/* ensure bit indicating barrier is required is clear */
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clear_bit(CREATE_BARRIER, &mdev->flags);
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memset(mdev->app_reads_hash, 0, APP_R_HSIZE*sizeof(void *));
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spin_unlock_irq(&mdev->req_lock);
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}
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void tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
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{
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spin_lock_irq(&mdev->req_lock);
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_tl_restart(mdev, what);
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spin_unlock_irq(&mdev->req_lock);
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}
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|
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/**
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* cl_wide_st_chg() - TRUE if the state change is a cluster wide one
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* @mdev: DRBD device.
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* @os: old (current) state.
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* @ns: new (wanted) state.
|
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*/
|
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static int cl_wide_st_chg(struct drbd_conf *mdev,
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union drbd_state os, union drbd_state ns)
|
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{
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return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED &&
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((os.role != R_PRIMARY && ns.role == R_PRIMARY) ||
|
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(os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
|
|
(os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) ||
|
|
(os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) ||
|
|
(os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) ||
|
|
(os.conn == C_CONNECTED && ns.conn == C_VERIFY_S);
|
|
}
|
|
|
|
int drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f,
|
|
union drbd_state mask, union drbd_state val)
|
|
{
|
|
unsigned long flags;
|
|
union drbd_state os, ns;
|
|
int rv;
|
|
|
|
spin_lock_irqsave(&mdev->req_lock, flags);
|
|
os = mdev->state;
|
|
ns.i = (os.i & ~mask.i) | val.i;
|
|
rv = _drbd_set_state(mdev, ns, f, NULL);
|
|
ns = mdev->state;
|
|
spin_unlock_irqrestore(&mdev->req_lock, flags);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* drbd_force_state() - Impose a change which happens outside our control on our state
|
|
* @mdev: DRBD device.
|
|
* @mask: mask of state bits to change.
|
|
* @val: value of new state bits.
|
|
*/
|
|
void drbd_force_state(struct drbd_conf *mdev,
|
|
union drbd_state mask, union drbd_state val)
|
|
{
|
|
drbd_change_state(mdev, CS_HARD, mask, val);
|
|
}
|
|
|
|
static int is_valid_state(struct drbd_conf *mdev, union drbd_state ns);
|
|
static int is_valid_state_transition(struct drbd_conf *,
|
|
union drbd_state, union drbd_state);
|
|
static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
|
|
union drbd_state ns, const char **warn_sync_abort);
|
|
int drbd_send_state_req(struct drbd_conf *,
|
|
union drbd_state, union drbd_state);
|
|
|
|
static enum drbd_state_ret_codes _req_st_cond(struct drbd_conf *mdev,
|
|
union drbd_state mask, union drbd_state val)
|
|
{
|
|
union drbd_state os, ns;
|
|
unsigned long flags;
|
|
int rv;
|
|
|
|
if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags))
|
|
return SS_CW_SUCCESS;
|
|
|
|
if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags))
|
|
return SS_CW_FAILED_BY_PEER;
|
|
|
|
rv = 0;
|
|
spin_lock_irqsave(&mdev->req_lock, flags);
|
|
os = mdev->state;
|
|
ns.i = (os.i & ~mask.i) | val.i;
|
|
ns = sanitize_state(mdev, os, ns, NULL);
|
|
|
|
if (!cl_wide_st_chg(mdev, os, ns))
|
|
rv = SS_CW_NO_NEED;
|
|
if (!rv) {
|
|
rv = is_valid_state(mdev, ns);
|
|
if (rv == SS_SUCCESS) {
|
|
rv = is_valid_state_transition(mdev, ns, os);
|
|
if (rv == SS_SUCCESS)
|
|
rv = 0; /* cont waiting, otherwise fail. */
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&mdev->req_lock, flags);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* drbd_req_state() - Perform an eventually cluster wide state change
|
|
* @mdev: DRBD device.
|
|
* @mask: mask of state bits to change.
|
|
* @val: value of new state bits.
|
|
* @f: flags
|
|
*
|
|
* Should not be called directly, use drbd_request_state() or
|
|
* _drbd_request_state().
|
|
*/
|
|
static int drbd_req_state(struct drbd_conf *mdev,
|
|
union drbd_state mask, union drbd_state val,
|
|
enum chg_state_flags f)
|
|
{
|
|
struct completion done;
|
|
unsigned long flags;
|
|
union drbd_state os, ns;
|
|
int rv;
|
|
|
|
init_completion(&done);
|
|
|
|
if (f & CS_SERIALIZE)
|
|
mutex_lock(&mdev->state_mutex);
|
|
|
|
spin_lock_irqsave(&mdev->req_lock, flags);
|
|
os = mdev->state;
|
|
ns.i = (os.i & ~mask.i) | val.i;
|
|
ns = sanitize_state(mdev, os, ns, NULL);
|
|
|
|
if (cl_wide_st_chg(mdev, os, ns)) {
|
|
rv = is_valid_state(mdev, ns);
|
|
if (rv == SS_SUCCESS)
|
|
rv = is_valid_state_transition(mdev, ns, os);
|
|
spin_unlock_irqrestore(&mdev->req_lock, flags);
|
|
|
|
if (rv < SS_SUCCESS) {
|
|
if (f & CS_VERBOSE)
|
|
print_st_err(mdev, os, ns, rv);
|
|
goto abort;
|
|
}
|
|
|
|
drbd_state_lock(mdev);
|
|
if (!drbd_send_state_req(mdev, mask, val)) {
|
|
drbd_state_unlock(mdev);
|
|
rv = SS_CW_FAILED_BY_PEER;
|
|
if (f & CS_VERBOSE)
|
|
print_st_err(mdev, os, ns, rv);
|
|
goto abort;
|
|
}
|
|
|
|
wait_event(mdev->state_wait,
|
|
(rv = _req_st_cond(mdev, mask, val)));
|
|
|
|
if (rv < SS_SUCCESS) {
|
|
drbd_state_unlock(mdev);
|
|
if (f & CS_VERBOSE)
|
|
print_st_err(mdev, os, ns, rv);
|
|
goto abort;
|
|
}
|
|
spin_lock_irqsave(&mdev->req_lock, flags);
|
|
os = mdev->state;
|
|
ns.i = (os.i & ~mask.i) | val.i;
|
|
rv = _drbd_set_state(mdev, ns, f, &done);
|
|
drbd_state_unlock(mdev);
|
|
} else {
|
|
rv = _drbd_set_state(mdev, ns, f, &done);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&mdev->req_lock, flags);
|
|
|
|
if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
|
|
D_ASSERT(current != mdev->worker.task);
|
|
wait_for_completion(&done);
|
|
}
|
|
|
|
abort:
|
|
if (f & CS_SERIALIZE)
|
|
mutex_unlock(&mdev->state_mutex);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* _drbd_request_state() - Request a state change (with flags)
|
|
* @mdev: DRBD device.
|
|
* @mask: mask of state bits to change.
|
|
* @val: value of new state bits.
|
|
* @f: flags
|
|
*
|
|
* Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE
|
|
* flag, or when logging of failed state change requests is not desired.
|
|
*/
|
|
int _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask,
|
|
union drbd_state val, enum chg_state_flags f)
|
|
{
|
|
int rv;
|
|
|
|
wait_event(mdev->state_wait,
|
|
(rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE);
|
|
|
|
return rv;
|
|
}
|
|
|
|
static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns)
|
|
{
|
|
dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c }\n",
|
|
name,
|
|
drbd_conn_str(ns.conn),
|
|
drbd_role_str(ns.role),
|
|
drbd_role_str(ns.peer),
|
|
drbd_disk_str(ns.disk),
|
|
drbd_disk_str(ns.pdsk),
|
|
is_susp(ns) ? 's' : 'r',
|
|
ns.aftr_isp ? 'a' : '-',
|
|
ns.peer_isp ? 'p' : '-',
|
|
ns.user_isp ? 'u' : '-'
|
|
);
|
|
}
|
|
|
|
void print_st_err(struct drbd_conf *mdev,
|
|
union drbd_state os, union drbd_state ns, int err)
|
|
{
|
|
if (err == SS_IN_TRANSIENT_STATE)
|
|
return;
|
|
dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err));
|
|
print_st(mdev, " state", os);
|
|
print_st(mdev, "wanted", ns);
|
|
}
|
|
|
|
|
|
#define drbd_peer_str drbd_role_str
|
|
#define drbd_pdsk_str drbd_disk_str
|
|
|
|
#define drbd_susp_str(A) ((A) ? "1" : "0")
|
|
#define drbd_aftr_isp_str(A) ((A) ? "1" : "0")
|
|
#define drbd_peer_isp_str(A) ((A) ? "1" : "0")
|
|
#define drbd_user_isp_str(A) ((A) ? "1" : "0")
|
|
|
|
#define PSC(A) \
|
|
({ if (ns.A != os.A) { \
|
|
pbp += sprintf(pbp, #A "( %s -> %s ) ", \
|
|
drbd_##A##_str(os.A), \
|
|
drbd_##A##_str(ns.A)); \
|
|
} })
|
|
|
|
/**
|
|
* is_valid_state() - Returns an SS_ error code if ns is not valid
|
|
* @mdev: DRBD device.
|
|
* @ns: State to consider.
|
|
*/
|
|
static int is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
|
|
{
|
|
/* See drbd_state_sw_errors in drbd_strings.c */
|
|
|
|
enum drbd_fencing_p fp;
|
|
int rv = SS_SUCCESS;
|
|
|
|
fp = FP_DONT_CARE;
|
|
if (get_ldev(mdev)) {
|
|
fp = mdev->ldev->dc.fencing;
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
if (get_net_conf(mdev)) {
|
|
if (!mdev->net_conf->two_primaries &&
|
|
ns.role == R_PRIMARY && ns.peer == R_PRIMARY)
|
|
rv = SS_TWO_PRIMARIES;
|
|
put_net_conf(mdev);
|
|
}
|
|
|
|
if (rv <= 0)
|
|
/* already found a reason to abort */;
|
|
else if (ns.role == R_SECONDARY && mdev->open_cnt)
|
|
rv = SS_DEVICE_IN_USE;
|
|
|
|
else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE)
|
|
rv = SS_NO_UP_TO_DATE_DISK;
|
|
|
|
else if (fp >= FP_RESOURCE &&
|
|
ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN)
|
|
rv = SS_PRIMARY_NOP;
|
|
|
|
else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT)
|
|
rv = SS_NO_UP_TO_DATE_DISK;
|
|
|
|
else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT)
|
|
rv = SS_NO_LOCAL_DISK;
|
|
|
|
else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT)
|
|
rv = SS_NO_REMOTE_DISK;
|
|
|
|
else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)
|
|
rv = SS_NO_UP_TO_DATE_DISK;
|
|
|
|
else if ((ns.conn == C_CONNECTED ||
|
|
ns.conn == C_WF_BITMAP_S ||
|
|
ns.conn == C_SYNC_SOURCE ||
|
|
ns.conn == C_PAUSED_SYNC_S) &&
|
|
ns.disk == D_OUTDATED)
|
|
rv = SS_CONNECTED_OUTDATES;
|
|
|
|
else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
|
|
(mdev->sync_conf.verify_alg[0] == 0))
|
|
rv = SS_NO_VERIFY_ALG;
|
|
|
|
else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
|
|
mdev->agreed_pro_version < 88)
|
|
rv = SS_NOT_SUPPORTED;
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* is_valid_state_transition() - Returns an SS_ error code if the state transition is not possible
|
|
* @mdev: DRBD device.
|
|
* @ns: new state.
|
|
* @os: old state.
|
|
*/
|
|
static int is_valid_state_transition(struct drbd_conf *mdev,
|
|
union drbd_state ns, union drbd_state os)
|
|
{
|
|
int rv = SS_SUCCESS;
|
|
|
|
if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) &&
|
|
os.conn > C_CONNECTED)
|
|
rv = SS_RESYNC_RUNNING;
|
|
|
|
if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE)
|
|
rv = SS_ALREADY_STANDALONE;
|
|
|
|
if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS)
|
|
rv = SS_IS_DISKLESS;
|
|
|
|
if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED)
|
|
rv = SS_NO_NET_CONFIG;
|
|
|
|
if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING)
|
|
rv = SS_LOWER_THAN_OUTDATED;
|
|
|
|
if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED)
|
|
rv = SS_IN_TRANSIENT_STATE;
|
|
|
|
if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
|
|
rv = SS_IN_TRANSIENT_STATE;
|
|
|
|
if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
|
|
rv = SS_NEED_CONNECTION;
|
|
|
|
if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
|
|
ns.conn != os.conn && os.conn > C_CONNECTED)
|
|
rv = SS_RESYNC_RUNNING;
|
|
|
|
if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) &&
|
|
os.conn < C_CONNECTED)
|
|
rv = SS_NEED_CONNECTION;
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* sanitize_state() - Resolves implicitly necessary additional changes to a state transition
|
|
* @mdev: DRBD device.
|
|
* @os: old state.
|
|
* @ns: new state.
|
|
* @warn_sync_abort:
|
|
*
|
|
* When we loose connection, we have to set the state of the peers disk (pdsk)
|
|
* to D_UNKNOWN. This rule and many more along those lines are in this function.
|
|
*/
|
|
static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
|
|
union drbd_state ns, const char **warn_sync_abort)
|
|
{
|
|
enum drbd_fencing_p fp;
|
|
|
|
fp = FP_DONT_CARE;
|
|
if (get_ldev(mdev)) {
|
|
fp = mdev->ldev->dc.fencing;
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
/* Disallow Network errors to configure a device's network part */
|
|
if ((ns.conn >= C_TIMEOUT && ns.conn <= C_TEAR_DOWN) &&
|
|
os.conn <= C_DISCONNECTING)
|
|
ns.conn = os.conn;
|
|
|
|
/* After a network error (+C_TEAR_DOWN) only C_UNCONNECTED or C_DISCONNECTING can follow.
|
|
* If you try to go into some Sync* state, that shall fail (elsewhere). */
|
|
if (os.conn >= C_TIMEOUT && os.conn <= C_TEAR_DOWN &&
|
|
ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING && ns.conn <= C_TEAR_DOWN)
|
|
ns.conn = os.conn;
|
|
|
|
/* we cannot fail (again) if we already detached */
|
|
if (ns.disk == D_FAILED && os.disk == D_DISKLESS)
|
|
ns.disk = D_DISKLESS;
|
|
|
|
/* if we are only D_ATTACHING yet,
|
|
* we can (and should) go directly to D_DISKLESS. */
|
|
if (ns.disk == D_FAILED && os.disk == D_ATTACHING)
|
|
ns.disk = D_DISKLESS;
|
|
|
|
/* After C_DISCONNECTING only C_STANDALONE may follow */
|
|
if (os.conn == C_DISCONNECTING && ns.conn != C_STANDALONE)
|
|
ns.conn = os.conn;
|
|
|
|
if (ns.conn < C_CONNECTED) {
|
|
ns.peer_isp = 0;
|
|
ns.peer = R_UNKNOWN;
|
|
if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT)
|
|
ns.pdsk = D_UNKNOWN;
|
|
}
|
|
|
|
/* Clear the aftr_isp when becoming unconfigured */
|
|
if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY)
|
|
ns.aftr_isp = 0;
|
|
|
|
/* Abort resync if a disk fails/detaches */
|
|
if (os.conn > C_CONNECTED && ns.conn > C_CONNECTED &&
|
|
(ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) {
|
|
if (warn_sync_abort)
|
|
*warn_sync_abort =
|
|
os.conn == C_VERIFY_S || os.conn == C_VERIFY_T ?
|
|
"Online-verify" : "Resync";
|
|
ns.conn = C_CONNECTED;
|
|
}
|
|
|
|
if (ns.conn >= C_CONNECTED &&
|
|
((ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED) ||
|
|
(ns.disk == D_NEGOTIATING && ns.conn == C_WF_BITMAP_T))) {
|
|
switch (ns.conn) {
|
|
case C_WF_BITMAP_T:
|
|
case C_PAUSED_SYNC_T:
|
|
ns.disk = D_OUTDATED;
|
|
break;
|
|
case C_CONNECTED:
|
|
case C_WF_BITMAP_S:
|
|
case C_SYNC_SOURCE:
|
|
case C_PAUSED_SYNC_S:
|
|
ns.disk = D_UP_TO_DATE;
|
|
break;
|
|
case C_SYNC_TARGET:
|
|
ns.disk = D_INCONSISTENT;
|
|
dev_warn(DEV, "Implicitly set disk state Inconsistent!\n");
|
|
break;
|
|
}
|
|
if (os.disk == D_OUTDATED && ns.disk == D_UP_TO_DATE)
|
|
dev_warn(DEV, "Implicitly set disk from Outdated to UpToDate\n");
|
|
}
|
|
|
|
if (ns.conn >= C_CONNECTED &&
|
|
(ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED)) {
|
|
switch (ns.conn) {
|
|
case C_CONNECTED:
|
|
case C_WF_BITMAP_T:
|
|
case C_PAUSED_SYNC_T:
|
|
case C_SYNC_TARGET:
|
|
ns.pdsk = D_UP_TO_DATE;
|
|
break;
|
|
case C_WF_BITMAP_S:
|
|
case C_PAUSED_SYNC_S:
|
|
/* remap any consistent state to D_OUTDATED,
|
|
* but disallow "upgrade" of not even consistent states.
|
|
*/
|
|
ns.pdsk =
|
|
(D_DISKLESS < os.pdsk && os.pdsk < D_OUTDATED)
|
|
? os.pdsk : D_OUTDATED;
|
|
break;
|
|
case C_SYNC_SOURCE:
|
|
ns.pdsk = D_INCONSISTENT;
|
|
dev_warn(DEV, "Implicitly set pdsk Inconsistent!\n");
|
|
break;
|
|
}
|
|
if (os.pdsk == D_OUTDATED && ns.pdsk == D_UP_TO_DATE)
|
|
dev_warn(DEV, "Implicitly set pdsk from Outdated to UpToDate\n");
|
|
}
|
|
|
|
/* Connection breaks down before we finished "Negotiating" */
|
|
if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING &&
|
|
get_ldev_if_state(mdev, D_NEGOTIATING)) {
|
|
if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) {
|
|
ns.disk = mdev->new_state_tmp.disk;
|
|
ns.pdsk = mdev->new_state_tmp.pdsk;
|
|
} else {
|
|
dev_alert(DEV, "Connection lost while negotiating, no data!\n");
|
|
ns.disk = D_DISKLESS;
|
|
ns.pdsk = D_UNKNOWN;
|
|
}
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
if (fp == FP_STONITH &&
|
|
(ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED) &&
|
|
!(os.role == R_PRIMARY && os.conn < C_CONNECTED && os.pdsk > D_OUTDATED))
|
|
ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */
|
|
|
|
if (mdev->sync_conf.on_no_data == OND_SUSPEND_IO &&
|
|
(ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) &&
|
|
!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE))
|
|
ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */
|
|
|
|
if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
|
|
if (ns.conn == C_SYNC_SOURCE)
|
|
ns.conn = C_PAUSED_SYNC_S;
|
|
if (ns.conn == C_SYNC_TARGET)
|
|
ns.conn = C_PAUSED_SYNC_T;
|
|
} else {
|
|
if (ns.conn == C_PAUSED_SYNC_S)
|
|
ns.conn = C_SYNC_SOURCE;
|
|
if (ns.conn == C_PAUSED_SYNC_T)
|
|
ns.conn = C_SYNC_TARGET;
|
|
}
|
|
|
|
return ns;
|
|
}
|
|
|
|
/* helper for __drbd_set_state */
|
|
static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
|
|
{
|
|
if (cs == C_VERIFY_T) {
|
|
/* starting online verify from an arbitrary position
|
|
* does not fit well into the existing protocol.
|
|
* on C_VERIFY_T, we initialize ov_left and friends
|
|
* implicitly in receive_DataRequest once the
|
|
* first P_OV_REQUEST is received */
|
|
mdev->ov_start_sector = ~(sector_t)0;
|
|
} else {
|
|
unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector);
|
|
if (bit >= mdev->rs_total)
|
|
mdev->ov_start_sector =
|
|
BM_BIT_TO_SECT(mdev->rs_total - 1);
|
|
mdev->ov_position = mdev->ov_start_sector;
|
|
}
|
|
}
|
|
|
|
static void drbd_resume_al(struct drbd_conf *mdev)
|
|
{
|
|
if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags))
|
|
dev_info(DEV, "Resumed AL updates\n");
|
|
}
|
|
|
|
/**
|
|
* __drbd_set_state() - Set a new DRBD state
|
|
* @mdev: DRBD device.
|
|
* @ns: new state.
|
|
* @flags: Flags
|
|
* @done: Optional completion, that will get completed after the after_state_ch() finished
|
|
*
|
|
* Caller needs to hold req_lock, and global_state_lock. Do not call directly.
|
|
*/
|
|
int __drbd_set_state(struct drbd_conf *mdev,
|
|
union drbd_state ns, enum chg_state_flags flags,
|
|
struct completion *done)
|
|
{
|
|
union drbd_state os;
|
|
int rv = SS_SUCCESS;
|
|
const char *warn_sync_abort = NULL;
|
|
struct after_state_chg_work *ascw;
|
|
|
|
os = mdev->state;
|
|
|
|
ns = sanitize_state(mdev, os, ns, &warn_sync_abort);
|
|
|
|
if (ns.i == os.i)
|
|
return SS_NOTHING_TO_DO;
|
|
|
|
if (!(flags & CS_HARD)) {
|
|
/* pre-state-change checks ; only look at ns */
|
|
/* See drbd_state_sw_errors in drbd_strings.c */
|
|
|
|
rv = is_valid_state(mdev, ns);
|
|
if (rv < SS_SUCCESS) {
|
|
/* If the old state was illegal as well, then let
|
|
this happen...*/
|
|
|
|
if (is_valid_state(mdev, os) == rv)
|
|
rv = is_valid_state_transition(mdev, ns, os);
|
|
} else
|
|
rv = is_valid_state_transition(mdev, ns, os);
|
|
}
|
|
|
|
if (rv < SS_SUCCESS) {
|
|
if (flags & CS_VERBOSE)
|
|
print_st_err(mdev, os, ns, rv);
|
|
return rv;
|
|
}
|
|
|
|
if (warn_sync_abort)
|
|
dev_warn(DEV, "%s aborted.\n", warn_sync_abort);
|
|
|
|
{
|
|
char *pbp, pb[300];
|
|
pbp = pb;
|
|
*pbp = 0;
|
|
PSC(role);
|
|
PSC(peer);
|
|
PSC(conn);
|
|
PSC(disk);
|
|
PSC(pdsk);
|
|
if (is_susp(ns) != is_susp(os))
|
|
pbp += sprintf(pbp, "susp( %s -> %s ) ",
|
|
drbd_susp_str(is_susp(os)),
|
|
drbd_susp_str(is_susp(ns)));
|
|
PSC(aftr_isp);
|
|
PSC(peer_isp);
|
|
PSC(user_isp);
|
|
dev_info(DEV, "%s\n", pb);
|
|
}
|
|
|
|
/* solve the race between becoming unconfigured,
|
|
* worker doing the cleanup, and
|
|
* admin reconfiguring us:
|
|
* on (re)configure, first set CONFIG_PENDING,
|
|
* then wait for a potentially exiting worker,
|
|
* start the worker, and schedule one no_op.
|
|
* then proceed with configuration.
|
|
*/
|
|
if (ns.disk == D_DISKLESS &&
|
|
ns.conn == C_STANDALONE &&
|
|
ns.role == R_SECONDARY &&
|
|
!test_and_set_bit(CONFIG_PENDING, &mdev->flags))
|
|
set_bit(DEVICE_DYING, &mdev->flags);
|
|
|
|
/* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference
|
|
* on the ldev here, to be sure the transition -> D_DISKLESS resp.
|
|
* drbd_ldev_destroy() won't happen before our corresponding
|
|
* after_state_ch works run, where we put_ldev again. */
|
|
if ((os.disk != D_FAILED && ns.disk == D_FAILED) ||
|
|
(os.disk != D_DISKLESS && ns.disk == D_DISKLESS))
|
|
atomic_inc(&mdev->local_cnt);
|
|
|
|
mdev->state = ns;
|
|
wake_up(&mdev->misc_wait);
|
|
wake_up(&mdev->state_wait);
|
|
|
|
/* aborted verify run. log the last position */
|
|
if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
|
|
ns.conn < C_CONNECTED) {
|
|
mdev->ov_start_sector =
|
|
BM_BIT_TO_SECT(mdev->rs_total - mdev->ov_left);
|
|
dev_info(DEV, "Online Verify reached sector %llu\n",
|
|
(unsigned long long)mdev->ov_start_sector);
|
|
}
|
|
|
|
if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
|
|
(ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
|
|
dev_info(DEV, "Syncer continues.\n");
|
|
mdev->rs_paused += (long)jiffies
|
|
-(long)mdev->rs_mark_time[mdev->rs_last_mark];
|
|
if (ns.conn == C_SYNC_TARGET)
|
|
mod_timer(&mdev->resync_timer, jiffies);
|
|
}
|
|
|
|
if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
|
|
(ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
|
|
dev_info(DEV, "Resync suspended\n");
|
|
mdev->rs_mark_time[mdev->rs_last_mark] = jiffies;
|
|
}
|
|
|
|
if (os.conn == C_CONNECTED &&
|
|
(ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
|
|
unsigned long now = jiffies;
|
|
int i;
|
|
|
|
mdev->ov_position = 0;
|
|
mdev->rs_total = drbd_bm_bits(mdev);
|
|
if (mdev->agreed_pro_version >= 90)
|
|
set_ov_position(mdev, ns.conn);
|
|
else
|
|
mdev->ov_start_sector = 0;
|
|
mdev->ov_left = mdev->rs_total
|
|
- BM_SECT_TO_BIT(mdev->ov_position);
|
|
mdev->rs_start = now;
|
|
mdev->rs_last_events = 0;
|
|
mdev->rs_last_sect_ev = 0;
|
|
mdev->ov_last_oos_size = 0;
|
|
mdev->ov_last_oos_start = 0;
|
|
|
|
for (i = 0; i < DRBD_SYNC_MARKS; i++) {
|
|
mdev->rs_mark_left[i] = mdev->rs_total;
|
|
mdev->rs_mark_time[i] = now;
|
|
}
|
|
|
|
if (ns.conn == C_VERIFY_S) {
|
|
dev_info(DEV, "Starting Online Verify from sector %llu\n",
|
|
(unsigned long long)mdev->ov_position);
|
|
mod_timer(&mdev->resync_timer, jiffies);
|
|
}
|
|
}
|
|
|
|
if (get_ldev(mdev)) {
|
|
u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
|
|
MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
|
|
MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
|
|
|
|
if (test_bit(CRASHED_PRIMARY, &mdev->flags))
|
|
mdf |= MDF_CRASHED_PRIMARY;
|
|
if (mdev->state.role == R_PRIMARY ||
|
|
(mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
|
|
mdf |= MDF_PRIMARY_IND;
|
|
if (mdev->state.conn > C_WF_REPORT_PARAMS)
|
|
mdf |= MDF_CONNECTED_IND;
|
|
if (mdev->state.disk > D_INCONSISTENT)
|
|
mdf |= MDF_CONSISTENT;
|
|
if (mdev->state.disk > D_OUTDATED)
|
|
mdf |= MDF_WAS_UP_TO_DATE;
|
|
if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
|
|
mdf |= MDF_PEER_OUT_DATED;
|
|
if (mdf != mdev->ldev->md.flags) {
|
|
mdev->ldev->md.flags = mdf;
|
|
drbd_md_mark_dirty(mdev);
|
|
}
|
|
if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
|
|
drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
/* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
|
|
if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
|
|
os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
|
|
set_bit(CONSIDER_RESYNC, &mdev->flags);
|
|
|
|
/* Receiver should clean up itself */
|
|
if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
|
|
drbd_thread_stop_nowait(&mdev->receiver);
|
|
|
|
/* Now the receiver finished cleaning up itself, it should die */
|
|
if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
|
|
drbd_thread_stop_nowait(&mdev->receiver);
|
|
|
|
/* Upon network failure, we need to restart the receiver. */
|
|
if (os.conn > C_TEAR_DOWN &&
|
|
ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
|
|
drbd_thread_restart_nowait(&mdev->receiver);
|
|
|
|
/* Resume AL writing if we get a connection */
|
|
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
|
|
drbd_resume_al(mdev);
|
|
|
|
ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
|
|
if (ascw) {
|
|
ascw->os = os;
|
|
ascw->ns = ns;
|
|
ascw->flags = flags;
|
|
ascw->w.cb = w_after_state_ch;
|
|
ascw->done = done;
|
|
drbd_queue_work(&mdev->data.work, &ascw->w);
|
|
} else {
|
|
dev_warn(DEV, "Could not kmalloc an ascw\n");
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused)
|
|
{
|
|
struct after_state_chg_work *ascw =
|
|
container_of(w, struct after_state_chg_work, w);
|
|
after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
|
|
if (ascw->flags & CS_WAIT_COMPLETE) {
|
|
D_ASSERT(ascw->done != NULL);
|
|
complete(ascw->done);
|
|
}
|
|
kfree(ascw);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void abw_start_sync(struct drbd_conf *mdev, int rv)
|
|
{
|
|
if (rv) {
|
|
dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
|
|
_drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
|
|
return;
|
|
}
|
|
|
|
switch (mdev->state.conn) {
|
|
case C_STARTING_SYNC_T:
|
|
_drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
|
|
break;
|
|
case C_STARTING_SYNC_S:
|
|
drbd_start_resync(mdev, C_SYNC_SOURCE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* after_state_ch() - Perform after state change actions that may sleep
|
|
* @mdev: DRBD device.
|
|
* @os: old state.
|
|
* @ns: new state.
|
|
* @flags: Flags
|
|
*/
|
|
static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
|
|
union drbd_state ns, enum chg_state_flags flags)
|
|
{
|
|
enum drbd_fencing_p fp;
|
|
enum drbd_req_event what = nothing;
|
|
union drbd_state nsm = (union drbd_state){ .i = -1 };
|
|
|
|
if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
|
|
clear_bit(CRASHED_PRIMARY, &mdev->flags);
|
|
if (mdev->p_uuid)
|
|
mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
|
|
}
|
|
|
|
fp = FP_DONT_CARE;
|
|
if (get_ldev(mdev)) {
|
|
fp = mdev->ldev->dc.fencing;
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
/* Inform userspace about the change... */
|
|
drbd_bcast_state(mdev, ns);
|
|
|
|
if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
|
|
(ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
|
|
drbd_khelper(mdev, "pri-on-incon-degr");
|
|
|
|
/* Here we have the actions that are performed after a
|
|
state change. This function might sleep */
|
|
|
|
nsm.i = -1;
|
|
if (ns.susp_nod) {
|
|
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
|
|
if (ns.conn == C_CONNECTED)
|
|
what = resend, nsm.susp_nod = 0;
|
|
else /* ns.conn > C_CONNECTED */
|
|
dev_err(DEV, "Unexpected Resynd going on!\n");
|
|
}
|
|
|
|
if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING)
|
|
what = restart_frozen_disk_io, nsm.susp_nod = 0;
|
|
|
|
}
|
|
|
|
if (ns.susp_fen) {
|
|
/* case1: The outdate peer handler is successful: */
|
|
if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) {
|
|
tl_clear(mdev);
|
|
if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
|
|
drbd_uuid_new_current(mdev);
|
|
clear_bit(NEW_CUR_UUID, &mdev->flags);
|
|
}
|
|
spin_lock_irq(&mdev->req_lock);
|
|
_drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
}
|
|
/* case2: The connection was established again: */
|
|
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
|
|
clear_bit(NEW_CUR_UUID, &mdev->flags);
|
|
what = resend;
|
|
nsm.susp_fen = 0;
|
|
}
|
|
}
|
|
|
|
if (what != nothing) {
|
|
spin_lock_irq(&mdev->req_lock);
|
|
_tl_restart(mdev, what);
|
|
nsm.i &= mdev->state.i;
|
|
_drbd_set_state(mdev, nsm, CS_VERBOSE, NULL);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
}
|
|
|
|
/* Do not change the order of the if above and the two below... */
|
|
if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */
|
|
drbd_send_uuids(mdev);
|
|
drbd_send_state(mdev);
|
|
}
|
|
if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S)
|
|
drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL, "send_bitmap (WFBitMapS)");
|
|
|
|
/* Lost contact to peer's copy of the data */
|
|
if ((os.pdsk >= D_INCONSISTENT &&
|
|
os.pdsk != D_UNKNOWN &&
|
|
os.pdsk != D_OUTDATED)
|
|
&& (ns.pdsk < D_INCONSISTENT ||
|
|
ns.pdsk == D_UNKNOWN ||
|
|
ns.pdsk == D_OUTDATED)) {
|
|
if (get_ldev(mdev)) {
|
|
if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
|
|
mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
|
|
if (is_susp(mdev->state)) {
|
|
set_bit(NEW_CUR_UUID, &mdev->flags);
|
|
} else {
|
|
drbd_uuid_new_current(mdev);
|
|
drbd_send_uuids(mdev);
|
|
}
|
|
}
|
|
put_ldev(mdev);
|
|
}
|
|
}
|
|
|
|
if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
|
|
if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) {
|
|
drbd_uuid_new_current(mdev);
|
|
drbd_send_uuids(mdev);
|
|
}
|
|
|
|
/* D_DISKLESS Peer becomes secondary */
|
|
if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
|
|
drbd_al_to_on_disk_bm(mdev);
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
/* Last part of the attaching process ... */
|
|
if (ns.conn >= C_CONNECTED &&
|
|
os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
|
|
drbd_send_sizes(mdev, 0, 0); /* to start sync... */
|
|
drbd_send_uuids(mdev);
|
|
drbd_send_state(mdev);
|
|
}
|
|
|
|
/* We want to pause/continue resync, tell peer. */
|
|
if (ns.conn >= C_CONNECTED &&
|
|
((os.aftr_isp != ns.aftr_isp) ||
|
|
(os.user_isp != ns.user_isp)))
|
|
drbd_send_state(mdev);
|
|
|
|
/* In case one of the isp bits got set, suspend other devices. */
|
|
if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
|
|
(ns.aftr_isp || ns.peer_isp || ns.user_isp))
|
|
suspend_other_sg(mdev);
|
|
|
|
/* Make sure the peer gets informed about eventual state
|
|
changes (ISP bits) while we were in WFReportParams. */
|
|
if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
|
|
drbd_send_state(mdev);
|
|
|
|
/* We are in the progress to start a full sync... */
|
|
if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
|
|
(os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
|
|
drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, &abw_start_sync, "set_n_write from StartingSync");
|
|
|
|
/* We are invalidating our self... */
|
|
if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
|
|
os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
|
|
drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, "set_n_write from invalidate");
|
|
|
|
/* first half of local IO error, failure to attach,
|
|
* or administrative detach */
|
|
if (os.disk != D_FAILED && ns.disk == D_FAILED) {
|
|
enum drbd_io_error_p eh;
|
|
int was_io_error;
|
|
/* corresponding get_ldev was in __drbd_set_state, to serialize
|
|
* our cleanup here with the transition to D_DISKLESS,
|
|
* so it is safe to dreference ldev here. */
|
|
eh = mdev->ldev->dc.on_io_error;
|
|
was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
|
|
|
|
/* current state still has to be D_FAILED,
|
|
* there is only one way out: to D_DISKLESS,
|
|
* and that may only happen after our put_ldev below. */
|
|
if (mdev->state.disk != D_FAILED)
|
|
dev_err(DEV,
|
|
"ASSERT FAILED: disk is %s during detach\n",
|
|
drbd_disk_str(mdev->state.disk));
|
|
|
|
if (drbd_send_state(mdev))
|
|
dev_warn(DEV, "Notified peer that I am detaching my disk\n");
|
|
else
|
|
dev_err(DEV, "Sending state for detaching disk failed\n");
|
|
|
|
drbd_rs_cancel_all(mdev);
|
|
|
|
/* In case we want to get something to stable storage still,
|
|
* this may be the last chance.
|
|
* Following put_ldev may transition to D_DISKLESS. */
|
|
drbd_md_sync(mdev);
|
|
put_ldev(mdev);
|
|
|
|
if (was_io_error && eh == EP_CALL_HELPER)
|
|
drbd_khelper(mdev, "local-io-error");
|
|
}
|
|
|
|
/* second half of local IO error, failure to attach,
|
|
* or administrative detach,
|
|
* after local_cnt references have reached zero again */
|
|
if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
|
|
/* We must still be diskless,
|
|
* re-attach has to be serialized with this! */
|
|
if (mdev->state.disk != D_DISKLESS)
|
|
dev_err(DEV,
|
|
"ASSERT FAILED: disk is %s while going diskless\n",
|
|
drbd_disk_str(mdev->state.disk));
|
|
|
|
mdev->rs_total = 0;
|
|
mdev->rs_failed = 0;
|
|
atomic_set(&mdev->rs_pending_cnt, 0);
|
|
|
|
if (drbd_send_state(mdev))
|
|
dev_warn(DEV, "Notified peer that I'm now diskless.\n");
|
|
else
|
|
dev_err(DEV, "Sending state for being diskless failed\n");
|
|
/* corresponding get_ldev in __drbd_set_state
|
|
* this may finaly trigger drbd_ldev_destroy. */
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
/* Disks got bigger while they were detached */
|
|
if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
|
|
test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
|
|
if (ns.conn == C_CONNECTED)
|
|
resync_after_online_grow(mdev);
|
|
}
|
|
|
|
/* A resync finished or aborted, wake paused devices... */
|
|
if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
|
|
(os.peer_isp && !ns.peer_isp) ||
|
|
(os.user_isp && !ns.user_isp))
|
|
resume_next_sg(mdev);
|
|
|
|
/* sync target done with resync. Explicitly notify peer, even though
|
|
* it should (at least for non-empty resyncs) already know itself. */
|
|
if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
|
|
drbd_send_state(mdev);
|
|
|
|
/* free tl_hash if we Got thawed and are C_STANDALONE */
|
|
if (ns.conn == C_STANDALONE && !is_susp(ns) && mdev->tl_hash)
|
|
drbd_free_tl_hash(mdev);
|
|
|
|
/* Upon network connection, we need to start the receiver */
|
|
if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED)
|
|
drbd_thread_start(&mdev->receiver);
|
|
|
|
/* Terminate worker thread if we are unconfigured - it will be
|
|
restarted as needed... */
|
|
if (ns.disk == D_DISKLESS &&
|
|
ns.conn == C_STANDALONE &&
|
|
ns.role == R_SECONDARY) {
|
|
if (os.aftr_isp != ns.aftr_isp)
|
|
resume_next_sg(mdev);
|
|
/* set in __drbd_set_state, unless CONFIG_PENDING was set */
|
|
if (test_bit(DEVICE_DYING, &mdev->flags))
|
|
drbd_thread_stop_nowait(&mdev->worker);
|
|
}
|
|
|
|
drbd_md_sync(mdev);
|
|
}
|
|
|
|
|
|
static int drbd_thread_setup(void *arg)
|
|
{
|
|
struct drbd_thread *thi = (struct drbd_thread *) arg;
|
|
struct drbd_conf *mdev = thi->mdev;
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
restart:
|
|
retval = thi->function(thi);
|
|
|
|
spin_lock_irqsave(&thi->t_lock, flags);
|
|
|
|
/* if the receiver has been "Exiting", the last thing it did
|
|
* was set the conn state to "StandAlone",
|
|
* if now a re-connect request comes in, conn state goes C_UNCONNECTED,
|
|
* and receiver thread will be "started".
|
|
* drbd_thread_start needs to set "Restarting" in that case.
|
|
* t_state check and assignment needs to be within the same spinlock,
|
|
* so either thread_start sees Exiting, and can remap to Restarting,
|
|
* or thread_start see None, and can proceed as normal.
|
|
*/
|
|
|
|
if (thi->t_state == Restarting) {
|
|
dev_info(DEV, "Restarting %s\n", current->comm);
|
|
thi->t_state = Running;
|
|
spin_unlock_irqrestore(&thi->t_lock, flags);
|
|
goto restart;
|
|
}
|
|
|
|
thi->task = NULL;
|
|
thi->t_state = None;
|
|
smp_mb();
|
|
complete(&thi->stop);
|
|
spin_unlock_irqrestore(&thi->t_lock, flags);
|
|
|
|
dev_info(DEV, "Terminating %s\n", current->comm);
|
|
|
|
/* Release mod reference taken when thread was started */
|
|
module_put(THIS_MODULE);
|
|
return retval;
|
|
}
|
|
|
|
static void drbd_thread_init(struct drbd_conf *mdev, struct drbd_thread *thi,
|
|
int (*func) (struct drbd_thread *))
|
|
{
|
|
spin_lock_init(&thi->t_lock);
|
|
thi->task = NULL;
|
|
thi->t_state = None;
|
|
thi->function = func;
|
|
thi->mdev = mdev;
|
|
}
|
|
|
|
int drbd_thread_start(struct drbd_thread *thi)
|
|
{
|
|
struct drbd_conf *mdev = thi->mdev;
|
|
struct task_struct *nt;
|
|
unsigned long flags;
|
|
|
|
const char *me =
|
|
thi == &mdev->receiver ? "receiver" :
|
|
thi == &mdev->asender ? "asender" :
|
|
thi == &mdev->worker ? "worker" : "NONSENSE";
|
|
|
|
/* is used from state engine doing drbd_thread_stop_nowait,
|
|
* while holding the req lock irqsave */
|
|
spin_lock_irqsave(&thi->t_lock, flags);
|
|
|
|
switch (thi->t_state) {
|
|
case None:
|
|
dev_info(DEV, "Starting %s thread (from %s [%d])\n",
|
|
me, current->comm, current->pid);
|
|
|
|
/* Get ref on module for thread - this is released when thread exits */
|
|
if (!try_module_get(THIS_MODULE)) {
|
|
dev_err(DEV, "Failed to get module reference in drbd_thread_start\n");
|
|
spin_unlock_irqrestore(&thi->t_lock, flags);
|
|
return FALSE;
|
|
}
|
|
|
|
init_completion(&thi->stop);
|
|
D_ASSERT(thi->task == NULL);
|
|
thi->reset_cpu_mask = 1;
|
|
thi->t_state = Running;
|
|
spin_unlock_irqrestore(&thi->t_lock, flags);
|
|
flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
|
|
|
|
nt = kthread_create(drbd_thread_setup, (void *) thi,
|
|
"drbd%d_%s", mdev_to_minor(mdev), me);
|
|
|
|
if (IS_ERR(nt)) {
|
|
dev_err(DEV, "Couldn't start thread\n");
|
|
|
|
module_put(THIS_MODULE);
|
|
return FALSE;
|
|
}
|
|
spin_lock_irqsave(&thi->t_lock, flags);
|
|
thi->task = nt;
|
|
thi->t_state = Running;
|
|
spin_unlock_irqrestore(&thi->t_lock, flags);
|
|
wake_up_process(nt);
|
|
break;
|
|
case Exiting:
|
|
thi->t_state = Restarting;
|
|
dev_info(DEV, "Restarting %s thread (from %s [%d])\n",
|
|
me, current->comm, current->pid);
|
|
/* fall through */
|
|
case Running:
|
|
case Restarting:
|
|
default:
|
|
spin_unlock_irqrestore(&thi->t_lock, flags);
|
|
break;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
|
|
{
|
|
unsigned long flags;
|
|
|
|
enum drbd_thread_state ns = restart ? Restarting : Exiting;
|
|
|
|
/* may be called from state engine, holding the req lock irqsave */
|
|
spin_lock_irqsave(&thi->t_lock, flags);
|
|
|
|
if (thi->t_state == None) {
|
|
spin_unlock_irqrestore(&thi->t_lock, flags);
|
|
if (restart)
|
|
drbd_thread_start(thi);
|
|
return;
|
|
}
|
|
|
|
if (thi->t_state != ns) {
|
|
if (thi->task == NULL) {
|
|
spin_unlock_irqrestore(&thi->t_lock, flags);
|
|
return;
|
|
}
|
|
|
|
thi->t_state = ns;
|
|
smp_mb();
|
|
init_completion(&thi->stop);
|
|
if (thi->task != current)
|
|
force_sig(DRBD_SIGKILL, thi->task);
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&thi->t_lock, flags);
|
|
|
|
if (wait)
|
|
wait_for_completion(&thi->stop);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
/**
|
|
* drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
|
|
* @mdev: DRBD device.
|
|
*
|
|
* Forces all threads of a device onto the same CPU. This is beneficial for
|
|
* DRBD's performance. May be overwritten by user's configuration.
|
|
*/
|
|
void drbd_calc_cpu_mask(struct drbd_conf *mdev)
|
|
{
|
|
int ord, cpu;
|
|
|
|
/* user override. */
|
|
if (cpumask_weight(mdev->cpu_mask))
|
|
return;
|
|
|
|
ord = mdev_to_minor(mdev) % cpumask_weight(cpu_online_mask);
|
|
for_each_online_cpu(cpu) {
|
|
if (ord-- == 0) {
|
|
cpumask_set_cpu(cpu, mdev->cpu_mask);
|
|
return;
|
|
}
|
|
}
|
|
/* should not be reached */
|
|
cpumask_setall(mdev->cpu_mask);
|
|
}
|
|
|
|
/**
|
|
* drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
|
|
* @mdev: DRBD device.
|
|
*
|
|
* 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_conf *mdev)
|
|
{
|
|
struct task_struct *p = current;
|
|
struct drbd_thread *thi =
|
|
p == mdev->asender.task ? &mdev->asender :
|
|
p == mdev->receiver.task ? &mdev->receiver :
|
|
p == mdev->worker.task ? &mdev->worker :
|
|
NULL;
|
|
ERR_IF(thi == NULL)
|
|
return;
|
|
if (!thi->reset_cpu_mask)
|
|
return;
|
|
thi->reset_cpu_mask = 0;
|
|
set_cpus_allowed_ptr(p, mdev->cpu_mask);
|
|
}
|
|
#endif
|
|
|
|
/* the appropriate socket mutex must be held already */
|
|
int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock,
|
|
enum drbd_packets cmd, struct p_header80 *h,
|
|
size_t size, unsigned msg_flags)
|
|
{
|
|
int sent, ok;
|
|
|
|
ERR_IF(!h) return FALSE;
|
|
ERR_IF(!size) return FALSE;
|
|
|
|
h->magic = BE_DRBD_MAGIC;
|
|
h->command = cpu_to_be16(cmd);
|
|
h->length = cpu_to_be16(size-sizeof(struct p_header80));
|
|
|
|
sent = drbd_send(mdev, sock, h, size, msg_flags);
|
|
|
|
ok = (sent == size);
|
|
if (!ok)
|
|
dev_err(DEV, "short sent %s size=%d sent=%d\n",
|
|
cmdname(cmd), (int)size, sent);
|
|
return ok;
|
|
}
|
|
|
|
/* don't pass the socket. we may only look at it
|
|
* when we hold the appropriate socket mutex.
|
|
*/
|
|
int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket,
|
|
enum drbd_packets cmd, struct p_header80 *h, size_t size)
|
|
{
|
|
int ok = 0;
|
|
struct socket *sock;
|
|
|
|
if (use_data_socket) {
|
|
mutex_lock(&mdev->data.mutex);
|
|
sock = mdev->data.socket;
|
|
} else {
|
|
mutex_lock(&mdev->meta.mutex);
|
|
sock = mdev->meta.socket;
|
|
}
|
|
|
|
/* drbd_disconnect() could have called drbd_free_sock()
|
|
* while we were waiting in down()... */
|
|
if (likely(sock != NULL))
|
|
ok = _drbd_send_cmd(mdev, sock, cmd, h, size, 0);
|
|
|
|
if (use_data_socket)
|
|
mutex_unlock(&mdev->data.mutex);
|
|
else
|
|
mutex_unlock(&mdev->meta.mutex);
|
|
return ok;
|
|
}
|
|
|
|
int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, char *data,
|
|
size_t size)
|
|
{
|
|
struct p_header80 h;
|
|
int ok;
|
|
|
|
h.magic = BE_DRBD_MAGIC;
|
|
h.command = cpu_to_be16(cmd);
|
|
h.length = cpu_to_be16(size);
|
|
|
|
if (!drbd_get_data_sock(mdev))
|
|
return 0;
|
|
|
|
ok = (sizeof(h) ==
|
|
drbd_send(mdev, mdev->data.socket, &h, sizeof(h), 0));
|
|
ok = ok && (size ==
|
|
drbd_send(mdev, mdev->data.socket, data, size, 0));
|
|
|
|
drbd_put_data_sock(mdev);
|
|
|
|
return ok;
|
|
}
|
|
|
|
int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc)
|
|
{
|
|
struct p_rs_param_95 *p;
|
|
struct socket *sock;
|
|
int size, rv;
|
|
const int apv = mdev->agreed_pro_version;
|
|
|
|
size = apv <= 87 ? sizeof(struct p_rs_param)
|
|
: apv == 88 ? sizeof(struct p_rs_param)
|
|
+ strlen(mdev->sync_conf.verify_alg) + 1
|
|
: apv <= 94 ? sizeof(struct p_rs_param_89)
|
|
: /* apv >= 95 */ sizeof(struct p_rs_param_95);
|
|
|
|
/* used from admin command context and receiver/worker context.
|
|
* to avoid kmalloc, grab the socket right here,
|
|
* then use the pre-allocated sbuf there */
|
|
mutex_lock(&mdev->data.mutex);
|
|
sock = mdev->data.socket;
|
|
|
|
if (likely(sock != NULL)) {
|
|
enum drbd_packets cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
|
|
|
|
p = &mdev->data.sbuf.rs_param_95;
|
|
|
|
/* initialize verify_alg and csums_alg */
|
|
memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
|
|
|
|
p->rate = cpu_to_be32(sc->rate);
|
|
p->c_plan_ahead = cpu_to_be32(sc->c_plan_ahead);
|
|
p->c_delay_target = cpu_to_be32(sc->c_delay_target);
|
|
p->c_fill_target = cpu_to_be32(sc->c_fill_target);
|
|
p->c_max_rate = cpu_to_be32(sc->c_max_rate);
|
|
|
|
if (apv >= 88)
|
|
strcpy(p->verify_alg, mdev->sync_conf.verify_alg);
|
|
if (apv >= 89)
|
|
strcpy(p->csums_alg, mdev->sync_conf.csums_alg);
|
|
|
|
rv = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0);
|
|
} else
|
|
rv = 0; /* not ok */
|
|
|
|
mutex_unlock(&mdev->data.mutex);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int drbd_send_protocol(struct drbd_conf *mdev)
|
|
{
|
|
struct p_protocol *p;
|
|
int size, cf, rv;
|
|
|
|
size = sizeof(struct p_protocol);
|
|
|
|
if (mdev->agreed_pro_version >= 87)
|
|
size += strlen(mdev->net_conf->integrity_alg) + 1;
|
|
|
|
/* we must not recurse into our own queue,
|
|
* as that is blocked during handshake */
|
|
p = kmalloc(size, GFP_NOIO);
|
|
if (p == NULL)
|
|
return 0;
|
|
|
|
p->protocol = cpu_to_be32(mdev->net_conf->wire_protocol);
|
|
p->after_sb_0p = cpu_to_be32(mdev->net_conf->after_sb_0p);
|
|
p->after_sb_1p = cpu_to_be32(mdev->net_conf->after_sb_1p);
|
|
p->after_sb_2p = cpu_to_be32(mdev->net_conf->after_sb_2p);
|
|
p->two_primaries = cpu_to_be32(mdev->net_conf->two_primaries);
|
|
|
|
cf = 0;
|
|
if (mdev->net_conf->want_lose)
|
|
cf |= CF_WANT_LOSE;
|
|
if (mdev->net_conf->dry_run) {
|
|
if (mdev->agreed_pro_version >= 92)
|
|
cf |= CF_DRY_RUN;
|
|
else {
|
|
dev_err(DEV, "--dry-run is not supported by peer");
|
|
kfree(p);
|
|
return 0;
|
|
}
|
|
}
|
|
p->conn_flags = cpu_to_be32(cf);
|
|
|
|
if (mdev->agreed_pro_version >= 87)
|
|
strcpy(p->integrity_alg, mdev->net_conf->integrity_alg);
|
|
|
|
rv = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_PROTOCOL,
|
|
(struct p_header80 *)p, size);
|
|
kfree(p);
|
|
return rv;
|
|
}
|
|
|
|
int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags)
|
|
{
|
|
struct p_uuids p;
|
|
int i;
|
|
|
|
if (!get_ldev_if_state(mdev, D_NEGOTIATING))
|
|
return 1;
|
|
|
|
for (i = UI_CURRENT; i < UI_SIZE; i++)
|
|
p.uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0;
|
|
|
|
mdev->comm_bm_set = drbd_bm_total_weight(mdev);
|
|
p.uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set);
|
|
uuid_flags |= mdev->net_conf->want_lose ? 1 : 0;
|
|
uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0;
|
|
uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
|
|
p.uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
|
|
|
|
put_ldev(mdev);
|
|
|
|
return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_UUIDS,
|
|
(struct p_header80 *)&p, sizeof(p));
|
|
}
|
|
|
|
int drbd_send_uuids(struct drbd_conf *mdev)
|
|
{
|
|
return _drbd_send_uuids(mdev, 0);
|
|
}
|
|
|
|
int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev)
|
|
{
|
|
return _drbd_send_uuids(mdev, 8);
|
|
}
|
|
|
|
|
|
int drbd_send_sync_uuid(struct drbd_conf *mdev, u64 val)
|
|
{
|
|
struct p_rs_uuid p;
|
|
|
|
p.uuid = cpu_to_be64(val);
|
|
|
|
return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SYNC_UUID,
|
|
(struct p_header80 *)&p, sizeof(p));
|
|
}
|
|
|
|
int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags)
|
|
{
|
|
struct p_sizes p;
|
|
sector_t d_size, u_size;
|
|
int q_order_type;
|
|
int ok;
|
|
|
|
if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
|
|
D_ASSERT(mdev->ldev->backing_bdev);
|
|
d_size = drbd_get_max_capacity(mdev->ldev);
|
|
u_size = mdev->ldev->dc.disk_size;
|
|
q_order_type = drbd_queue_order_type(mdev);
|
|
put_ldev(mdev);
|
|
} else {
|
|
d_size = 0;
|
|
u_size = 0;
|
|
q_order_type = QUEUE_ORDERED_NONE;
|
|
}
|
|
|
|
p.d_size = cpu_to_be64(d_size);
|
|
p.u_size = cpu_to_be64(u_size);
|
|
p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev));
|
|
p.max_segment_size = cpu_to_be32(queue_max_segment_size(mdev->rq_queue));
|
|
p.queue_order_type = cpu_to_be16(q_order_type);
|
|
p.dds_flags = cpu_to_be16(flags);
|
|
|
|
ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SIZES,
|
|
(struct p_header80 *)&p, sizeof(p));
|
|
return ok;
|
|
}
|
|
|
|
/**
|
|
* drbd_send_state() - Sends the drbd state to the peer
|
|
* @mdev: DRBD device.
|
|
*/
|
|
int drbd_send_state(struct drbd_conf *mdev)
|
|
{
|
|
struct socket *sock;
|
|
struct p_state p;
|
|
int ok = 0;
|
|
|
|
/* Grab state lock so we wont send state if we're in the middle
|
|
* of a cluster wide state change on another thread */
|
|
drbd_state_lock(mdev);
|
|
|
|
mutex_lock(&mdev->data.mutex);
|
|
|
|
p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */
|
|
sock = mdev->data.socket;
|
|
|
|
if (likely(sock != NULL)) {
|
|
ok = _drbd_send_cmd(mdev, sock, P_STATE,
|
|
(struct p_header80 *)&p, sizeof(p), 0);
|
|
}
|
|
|
|
mutex_unlock(&mdev->data.mutex);
|
|
|
|
drbd_state_unlock(mdev);
|
|
return ok;
|
|
}
|
|
|
|
int drbd_send_state_req(struct drbd_conf *mdev,
|
|
union drbd_state mask, union drbd_state val)
|
|
{
|
|
struct p_req_state p;
|
|
|
|
p.mask = cpu_to_be32(mask.i);
|
|
p.val = cpu_to_be32(val.i);
|
|
|
|
return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_STATE_CHG_REQ,
|
|
(struct p_header80 *)&p, sizeof(p));
|
|
}
|
|
|
|
int drbd_send_sr_reply(struct drbd_conf *mdev, int retcode)
|
|
{
|
|
struct p_req_state_reply p;
|
|
|
|
p.retcode = cpu_to_be32(retcode);
|
|
|
|
return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY,
|
|
(struct p_header80 *)&p, sizeof(p));
|
|
}
|
|
|
|
int fill_bitmap_rle_bits(struct drbd_conf *mdev,
|
|
struct p_compressed_bm *p,
|
|
struct bm_xfer_ctx *c)
|
|
{
|
|
struct bitstream bs;
|
|
unsigned long plain_bits;
|
|
unsigned long tmp;
|
|
unsigned long rl;
|
|
unsigned len;
|
|
unsigned toggle;
|
|
int bits;
|
|
|
|
/* may we use this feature? */
|
|
if ((mdev->sync_conf.use_rle == 0) ||
|
|
(mdev->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, BM_PACKET_VLI_BYTES_MAX, 0);
|
|
memset(p->code, 0, BM_PACKET_VLI_BYTES_MAX);
|
|
/* 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(mdev, c->bit_offset)
|
|
: _drbd_bm_find_next(mdev, 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) {
|
|
dev_err(DEV, "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) {
|
|
dev_err(DEV, "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;
|
|
}
|
|
|
|
enum { OK, FAILED, DONE }
|
|
send_bitmap_rle_or_plain(struct drbd_conf *mdev,
|
|
struct p_header80 *h, struct bm_xfer_ctx *c)
|
|
{
|
|
struct p_compressed_bm *p = (void*)h;
|
|
unsigned long num_words;
|
|
int len;
|
|
int ok;
|
|
|
|
len = fill_bitmap_rle_bits(mdev, p, c);
|
|
|
|
if (len < 0)
|
|
return FAILED;
|
|
|
|
if (len) {
|
|
DCBP_set_code(p, RLE_VLI_Bits);
|
|
ok = _drbd_send_cmd(mdev, mdev->data.socket, P_COMPRESSED_BITMAP, h,
|
|
sizeof(*p) + len, 0);
|
|
|
|
c->packets[0]++;
|
|
c->bytes[0] += 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. */
|
|
num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
|
|
len = num_words * sizeof(long);
|
|
if (len)
|
|
drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload);
|
|
ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BITMAP,
|
|
h, sizeof(struct p_header80) + len, 0);
|
|
c->word_offset += num_words;
|
|
c->bit_offset = c->word_offset * BITS_PER_LONG;
|
|
|
|
c->packets[1]++;
|
|
c->bytes[1] += sizeof(struct p_header80) + len;
|
|
|
|
if (c->bit_offset > c->bm_bits)
|
|
c->bit_offset = c->bm_bits;
|
|
}
|
|
ok = ok ? ((len == 0) ? DONE : OK) : FAILED;
|
|
|
|
if (ok == DONE)
|
|
INFO_bm_xfer_stats(mdev, "send", c);
|
|
return ok;
|
|
}
|
|
|
|
/* See the comment at receive_bitmap() */
|
|
int _drbd_send_bitmap(struct drbd_conf *mdev)
|
|
{
|
|
struct bm_xfer_ctx c;
|
|
struct p_header80 *p;
|
|
int ret;
|
|
|
|
ERR_IF(!mdev->bitmap) return FALSE;
|
|
|
|
/* maybe we should use some per thread scratch page,
|
|
* and allocate that during initial device creation? */
|
|
p = (struct p_header80 *) __get_free_page(GFP_NOIO);
|
|
if (!p) {
|
|
dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
|
|
return FALSE;
|
|
}
|
|
|
|
if (get_ldev(mdev)) {
|
|
if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
|
|
dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n");
|
|
drbd_bm_set_all(mdev);
|
|
if (drbd_bm_write(mdev)) {
|
|
/* 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! */
|
|
dev_err(DEV, "Failed to write bitmap to disk!\n");
|
|
} else {
|
|
drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
|
|
drbd_md_sync(mdev);
|
|
}
|
|
}
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
c = (struct bm_xfer_ctx) {
|
|
.bm_bits = drbd_bm_bits(mdev),
|
|
.bm_words = drbd_bm_words(mdev),
|
|
};
|
|
|
|
do {
|
|
ret = send_bitmap_rle_or_plain(mdev, p, &c);
|
|
} while (ret == OK);
|
|
|
|
free_page((unsigned long) p);
|
|
return (ret == DONE);
|
|
}
|
|
|
|
int drbd_send_bitmap(struct drbd_conf *mdev)
|
|
{
|
|
int err;
|
|
|
|
if (!drbd_get_data_sock(mdev))
|
|
return -1;
|
|
err = !_drbd_send_bitmap(mdev);
|
|
drbd_put_data_sock(mdev);
|
|
return err;
|
|
}
|
|
|
|
int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size)
|
|
{
|
|
int ok;
|
|
struct p_barrier_ack p;
|
|
|
|
p.barrier = barrier_nr;
|
|
p.set_size = cpu_to_be32(set_size);
|
|
|
|
if (mdev->state.conn < C_CONNECTED)
|
|
return FALSE;
|
|
ok = drbd_send_cmd(mdev, USE_META_SOCKET, P_BARRIER_ACK,
|
|
(struct p_header80 *)&p, sizeof(p));
|
|
return ok;
|
|
}
|
|
|
|
/**
|
|
* _drbd_send_ack() - Sends an ack packet
|
|
* @mdev: DRBD device.
|
|
* @cmd: Packet command code.
|
|
* @sector: sector, needs to be in big endian byte order
|
|
* @blksize: size in byte, needs to be in big endian byte order
|
|
* @block_id: Id, big endian byte order
|
|
*/
|
|
static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd,
|
|
u64 sector,
|
|
u32 blksize,
|
|
u64 block_id)
|
|
{
|
|
int ok;
|
|
struct p_block_ack p;
|
|
|
|
p.sector = sector;
|
|
p.block_id = block_id;
|
|
p.blksize = blksize;
|
|
p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq));
|
|
|
|
if (!mdev->meta.socket || mdev->state.conn < C_CONNECTED)
|
|
return FALSE;
|
|
ok = drbd_send_cmd(mdev, USE_META_SOCKET, cmd,
|
|
(struct p_header80 *)&p, sizeof(p));
|
|
return ok;
|
|
}
|
|
|
|
/* 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. */
|
|
int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd,
|
|
struct p_data *dp, int data_size)
|
|
{
|
|
data_size -= (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
|
|
crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
|
|
return _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size),
|
|
dp->block_id);
|
|
}
|
|
|
|
int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd,
|
|
struct p_block_req *rp)
|
|
{
|
|
return _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id);
|
|
}
|
|
|
|
/**
|
|
* drbd_send_ack() - Sends an ack packet
|
|
* @mdev: DRBD device.
|
|
* @cmd: Packet command code.
|
|
* @e: Epoch entry.
|
|
*/
|
|
int drbd_send_ack(struct drbd_conf *mdev,
|
|
enum drbd_packets cmd, struct drbd_epoch_entry *e)
|
|
{
|
|
return _drbd_send_ack(mdev, cmd,
|
|
cpu_to_be64(e->sector),
|
|
cpu_to_be32(e->size),
|
|
e->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_conf *mdev, enum drbd_packets cmd,
|
|
sector_t sector, int blksize, u64 block_id)
|
|
{
|
|
return _drbd_send_ack(mdev, cmd,
|
|
cpu_to_be64(sector),
|
|
cpu_to_be32(blksize),
|
|
cpu_to_be64(block_id));
|
|
}
|
|
|
|
int drbd_send_drequest(struct drbd_conf *mdev, int cmd,
|
|
sector_t sector, int size, u64 block_id)
|
|
{
|
|
int ok;
|
|
struct p_block_req p;
|
|
|
|
p.sector = cpu_to_be64(sector);
|
|
p.block_id = block_id;
|
|
p.blksize = cpu_to_be32(size);
|
|
|
|
ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd,
|
|
(struct p_header80 *)&p, sizeof(p));
|
|
return ok;
|
|
}
|
|
|
|
int drbd_send_drequest_csum(struct drbd_conf *mdev,
|
|
sector_t sector, int size,
|
|
void *digest, int digest_size,
|
|
enum drbd_packets cmd)
|
|
{
|
|
int ok;
|
|
struct p_block_req p;
|
|
|
|
p.sector = cpu_to_be64(sector);
|
|
p.block_id = BE_DRBD_MAGIC + 0xbeef;
|
|
p.blksize = cpu_to_be32(size);
|
|
|
|
p.head.magic = BE_DRBD_MAGIC;
|
|
p.head.command = cpu_to_be16(cmd);
|
|
p.head.length = cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + digest_size);
|
|
|
|
mutex_lock(&mdev->data.mutex);
|
|
|
|
ok = (sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), 0));
|
|
ok = ok && (digest_size == drbd_send(mdev, mdev->data.socket, digest, digest_size, 0));
|
|
|
|
mutex_unlock(&mdev->data.mutex);
|
|
|
|
return ok;
|
|
}
|
|
|
|
int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size)
|
|
{
|
|
int ok;
|
|
struct p_block_req p;
|
|
|
|
p.sector = cpu_to_be64(sector);
|
|
p.block_id = BE_DRBD_MAGIC + 0xbabe;
|
|
p.blksize = cpu_to_be32(size);
|
|
|
|
ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OV_REQUEST,
|
|
(struct p_header80 *)&p, sizeof(p));
|
|
return ok;
|
|
}
|
|
|
|
/* 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_conf *mdev, struct socket *sock)
|
|
{
|
|
int drop_it;
|
|
/* long elapsed = (long)(jiffies - mdev->last_received); */
|
|
|
|
drop_it = mdev->meta.socket == sock
|
|
|| !mdev->asender.task
|
|
|| get_t_state(&mdev->asender) != Running
|
|
|| mdev->state.conn < C_CONNECTED;
|
|
|
|
if (drop_it)
|
|
return TRUE;
|
|
|
|
drop_it = !--mdev->ko_count;
|
|
if (!drop_it) {
|
|
dev_err(DEV, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
|
|
current->comm, current->pid, mdev->ko_count);
|
|
request_ping(mdev);
|
|
}
|
|
|
|
return drop_it; /* && (mdev->state == R_PRIMARY) */;
|
|
}
|
|
|
|
/* 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_conf *mdev, struct page *page,
|
|
int offset, size_t size, unsigned msg_flags)
|
|
{
|
|
int sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, msg_flags);
|
|
kunmap(page);
|
|
if (sent == size)
|
|
mdev->send_cnt += size>>9;
|
|
return sent == size;
|
|
}
|
|
|
|
static int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
|
|
int offset, size_t size, unsigned msg_flags)
|
|
{
|
|
mm_segment_t oldfs = get_fs();
|
|
int sent, ok;
|
|
int len = size;
|
|
|
|
/* e.g. XFS meta- & log-data is in slab pages, which have a
|
|
* page_count of 0 and/or have PageSlab() set.
|
|
* we cannot use send_page for those, as that does get_page();
|
|
* put_page(); and would cause either a VM_BUG directly, or
|
|
* __page_cache_release a page that would actually still be referenced
|
|
* by someone, leading to some obscure delayed Oops somewhere else. */
|
|
if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
|
|
return _drbd_no_send_page(mdev, page, offset, size, msg_flags);
|
|
|
|
msg_flags |= MSG_NOSIGNAL;
|
|
drbd_update_congested(mdev);
|
|
set_fs(KERNEL_DS);
|
|
do {
|
|
sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page,
|
|
offset, len,
|
|
msg_flags);
|
|
if (sent == -EAGAIN) {
|
|
if (we_should_drop_the_connection(mdev,
|
|
mdev->data.socket))
|
|
break;
|
|
else
|
|
continue;
|
|
}
|
|
if (sent <= 0) {
|
|
dev_warn(DEV, "%s: size=%d len=%d sent=%d\n",
|
|
__func__, (int)size, len, sent);
|
|
break;
|
|
}
|
|
len -= sent;
|
|
offset += sent;
|
|
} while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/);
|
|
set_fs(oldfs);
|
|
clear_bit(NET_CONGESTED, &mdev->flags);
|
|
|
|
ok = (len == 0);
|
|
if (likely(ok))
|
|
mdev->send_cnt += size>>9;
|
|
return ok;
|
|
}
|
|
|
|
static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
|
|
{
|
|
struct bio_vec *bvec;
|
|
int i;
|
|
/* hint all but last page with MSG_MORE */
|
|
__bio_for_each_segment(bvec, bio, i, 0) {
|
|
if (!_drbd_no_send_page(mdev, bvec->bv_page,
|
|
bvec->bv_offset, bvec->bv_len,
|
|
i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
|
|
{
|
|
struct bio_vec *bvec;
|
|
int i;
|
|
/* hint all but last page with MSG_MORE */
|
|
__bio_for_each_segment(bvec, bio, i, 0) {
|
|
if (!_drbd_send_page(mdev, bvec->bv_page,
|
|
bvec->bv_offset, bvec->bv_len,
|
|
i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
|
|
{
|
|
struct page *page = e->pages;
|
|
unsigned len = e->size;
|
|
/* hint all but last page with MSG_MORE */
|
|
page_chain_for_each(page) {
|
|
unsigned l = min_t(unsigned, len, PAGE_SIZE);
|
|
if (!_drbd_send_page(mdev, page, 0, l,
|
|
page_chain_next(page) ? MSG_MORE : 0))
|
|
return 0;
|
|
len -= l;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw)
|
|
{
|
|
if (mdev->agreed_pro_version >= 95)
|
|
return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
|
|
(bi_rw & REQ_UNPLUG ? DP_UNPLUG : 0) |
|
|
(bi_rw & REQ_FUA ? DP_FUA : 0) |
|
|
(bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
|
|
(bi_rw & REQ_DISCARD ? DP_DISCARD : 0);
|
|
else
|
|
return bi_rw & (REQ_SYNC | REQ_UNPLUG) ? DP_RW_SYNC : 0;
|
|
}
|
|
|
|
/* Used to send write requests
|
|
* R_PRIMARY -> Peer (P_DATA)
|
|
*/
|
|
int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
|
|
{
|
|
int ok = 1;
|
|
struct p_data p;
|
|
unsigned int dp_flags = 0;
|
|
void *dgb;
|
|
int dgs;
|
|
|
|
if (!drbd_get_data_sock(mdev))
|
|
return 0;
|
|
|
|
dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
|
|
crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
|
|
|
|
if (req->size <= DRBD_MAX_SIZE_H80_PACKET) {
|
|
p.head.h80.magic = BE_DRBD_MAGIC;
|
|
p.head.h80.command = cpu_to_be16(P_DATA);
|
|
p.head.h80.length =
|
|
cpu_to_be16(sizeof(p) - sizeof(union p_header) + dgs + req->size);
|
|
} else {
|
|
p.head.h95.magic = BE_DRBD_MAGIC_BIG;
|
|
p.head.h95.command = cpu_to_be16(P_DATA);
|
|
p.head.h95.length =
|
|
cpu_to_be32(sizeof(p) - sizeof(union p_header) + dgs + req->size);
|
|
}
|
|
|
|
p.sector = cpu_to_be64(req->sector);
|
|
p.block_id = (unsigned long)req;
|
|
p.seq_num = cpu_to_be32(req->seq_num =
|
|
atomic_add_return(1, &mdev->packet_seq));
|
|
|
|
dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw);
|
|
|
|
if (mdev->state.conn >= C_SYNC_SOURCE &&
|
|
mdev->state.conn <= C_PAUSED_SYNC_T)
|
|
dp_flags |= DP_MAY_SET_IN_SYNC;
|
|
|
|
p.dp_flags = cpu_to_be32(dp_flags);
|
|
set_bit(UNPLUG_REMOTE, &mdev->flags);
|
|
ok = (sizeof(p) ==
|
|
drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0));
|
|
if (ok && dgs) {
|
|
dgb = mdev->int_dig_out;
|
|
drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, dgb);
|
|
ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
|
|
}
|
|
if (ok) {
|
|
if (mdev->net_conf->wire_protocol == DRBD_PROT_A)
|
|
ok = _drbd_send_bio(mdev, req->master_bio);
|
|
else
|
|
ok = _drbd_send_zc_bio(mdev, req->master_bio);
|
|
}
|
|
|
|
drbd_put_data_sock(mdev);
|
|
|
|
return ok;
|
|
}
|
|
|
|
/* 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_conf *mdev, enum drbd_packets cmd,
|
|
struct drbd_epoch_entry *e)
|
|
{
|
|
int ok;
|
|
struct p_data p;
|
|
void *dgb;
|
|
int dgs;
|
|
|
|
dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
|
|
crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
|
|
|
|
if (e->size <= DRBD_MAX_SIZE_H80_PACKET) {
|
|
p.head.h80.magic = BE_DRBD_MAGIC;
|
|
p.head.h80.command = cpu_to_be16(cmd);
|
|
p.head.h80.length =
|
|
cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
|
|
} else {
|
|
p.head.h95.magic = BE_DRBD_MAGIC_BIG;
|
|
p.head.h95.command = cpu_to_be16(cmd);
|
|
p.head.h95.length =
|
|
cpu_to_be32(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
|
|
}
|
|
|
|
p.sector = cpu_to_be64(e->sector);
|
|
p.block_id = e->block_id;
|
|
/* p.seq_num = 0; No sequence numbers here.. */
|
|
|
|
/* Only called by our kernel thread.
|
|
* This one may be interrupted by DRBD_SIG and/or DRBD_SIGKILL
|
|
* in response to admin command or module unload.
|
|
*/
|
|
if (!drbd_get_data_sock(mdev))
|
|
return 0;
|
|
|
|
ok = sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0);
|
|
if (ok && dgs) {
|
|
dgb = mdev->int_dig_out;
|
|
drbd_csum_ee(mdev, mdev->integrity_w_tfm, e, dgb);
|
|
ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
|
|
}
|
|
if (ok)
|
|
ok = _drbd_send_zc_ee(mdev, e);
|
|
|
|
drbd_put_data_sock(mdev);
|
|
|
|
return ok;
|
|
}
|
|
|
|
/*
|
|
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_conf *mdev, struct socket *sock,
|
|
void *buf, size_t size, unsigned msg_flags)
|
|
{
|
|
struct kvec iov;
|
|
struct msghdr msg;
|
|
int rv, sent = 0;
|
|
|
|
if (!sock)
|
|
return -1000;
|
|
|
|
/* THINK if (signal_pending) return ... ? */
|
|
|
|
iov.iov_base = buf;
|
|
iov.iov_len = size;
|
|
|
|
msg.msg_name = NULL;
|
|
msg.msg_namelen = 0;
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = msg_flags | MSG_NOSIGNAL;
|
|
|
|
if (sock == mdev->data.socket) {
|
|
mdev->ko_count = mdev->net_conf->ko_count;
|
|
drbd_update_congested(mdev);
|
|
}
|
|
do {
|
|
/* STRANGE
|
|
* tcp_sendmsg does _not_ use its size parameter at all ?
|
|
*
|
|
* -EAGAIN on timeout, -EINTR on signal.
|
|
*/
|
|
/* THINK
|
|
* do we need to block DRBD_SIG if sock == &meta.socket ??
|
|
* otherwise wake_asender() might interrupt some send_*Ack !
|
|
*/
|
|
rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
|
|
if (rv == -EAGAIN) {
|
|
if (we_should_drop_the_connection(mdev, sock))
|
|
break;
|
|
else
|
|
continue;
|
|
}
|
|
D_ASSERT(rv != 0);
|
|
if (rv == -EINTR) {
|
|
flush_signals(current);
|
|
rv = 0;
|
|
}
|
|
if (rv < 0)
|
|
break;
|
|
sent += rv;
|
|
iov.iov_base += rv;
|
|
iov.iov_len -= rv;
|
|
} while (sent < size);
|
|
|
|
if (sock == mdev->data.socket)
|
|
clear_bit(NET_CONGESTED, &mdev->flags);
|
|
|
|
if (rv <= 0) {
|
|
if (rv != -EAGAIN) {
|
|
dev_err(DEV, "%s_sendmsg returned %d\n",
|
|
sock == mdev->meta.socket ? "msock" : "sock",
|
|
rv);
|
|
drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
|
|
} else
|
|
drbd_force_state(mdev, NS(conn, C_TIMEOUT));
|
|
}
|
|
|
|
return sent;
|
|
}
|
|
|
|
static int drbd_open(struct block_device *bdev, fmode_t mode)
|
|
{
|
|
struct drbd_conf *mdev = bdev->bd_disk->private_data;
|
|
unsigned long flags;
|
|
int rv = 0;
|
|
|
|
mutex_lock(&drbd_main_mutex);
|
|
spin_lock_irqsave(&mdev->req_lock, flags);
|
|
/* to have a stable mdev->state.role
|
|
* and no race with updating open_cnt */
|
|
|
|
if (mdev->state.role != R_PRIMARY) {
|
|
if (mode & FMODE_WRITE)
|
|
rv = -EROFS;
|
|
else if (!allow_oos)
|
|
rv = -EMEDIUMTYPE;
|
|
}
|
|
|
|
if (!rv)
|
|
mdev->open_cnt++;
|
|
spin_unlock_irqrestore(&mdev->req_lock, flags);
|
|
mutex_unlock(&drbd_main_mutex);
|
|
|
|
return rv;
|
|
}
|
|
|
|
static int drbd_release(struct gendisk *gd, fmode_t mode)
|
|
{
|
|
struct drbd_conf *mdev = gd->private_data;
|
|
mutex_lock(&drbd_main_mutex);
|
|
mdev->open_cnt--;
|
|
mutex_unlock(&drbd_main_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static void drbd_unplug_fn(struct request_queue *q)
|
|
{
|
|
struct drbd_conf *mdev = q->queuedata;
|
|
|
|
/* unplug FIRST */
|
|
spin_lock_irq(q->queue_lock);
|
|
blk_remove_plug(q);
|
|
spin_unlock_irq(q->queue_lock);
|
|
|
|
/* only if connected */
|
|
spin_lock_irq(&mdev->req_lock);
|
|
if (mdev->state.pdsk >= D_INCONSISTENT && mdev->state.conn >= C_CONNECTED) {
|
|
D_ASSERT(mdev->state.role == R_PRIMARY);
|
|
if (test_and_clear_bit(UNPLUG_REMOTE, &mdev->flags)) {
|
|
/* add to the data.work queue,
|
|
* unless already queued.
|
|
* XXX this might be a good addition to drbd_queue_work
|
|
* anyways, to detect "double queuing" ... */
|
|
if (list_empty(&mdev->unplug_work.list))
|
|
drbd_queue_work(&mdev->data.work,
|
|
&mdev->unplug_work);
|
|
}
|
|
}
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
if (mdev->state.disk >= D_INCONSISTENT)
|
|
drbd_kick_lo(mdev);
|
|
}
|
|
|
|
static void drbd_set_defaults(struct drbd_conf *mdev)
|
|
{
|
|
/* This way we get a compile error when sync_conf grows,
|
|
and we forgot to initialize it here */
|
|
mdev->sync_conf = (struct syncer_conf) {
|
|
/* .rate = */ DRBD_RATE_DEF,
|
|
/* .after = */ DRBD_AFTER_DEF,
|
|
/* .al_extents = */ DRBD_AL_EXTENTS_DEF,
|
|
/* .verify_alg = */ {}, 0,
|
|
/* .cpu_mask = */ {}, 0,
|
|
/* .csums_alg = */ {}, 0,
|
|
/* .use_rle = */ 0,
|
|
/* .on_no_data = */ DRBD_ON_NO_DATA_DEF,
|
|
/* .c_plan_ahead = */ DRBD_C_PLAN_AHEAD_DEF,
|
|
/* .c_delay_target = */ DRBD_C_DELAY_TARGET_DEF,
|
|
/* .c_fill_target = */ DRBD_C_FILL_TARGET_DEF,
|
|
/* .c_max_rate = */ DRBD_C_MAX_RATE_DEF,
|
|
/* .c_min_rate = */ DRBD_C_MIN_RATE_DEF
|
|
};
|
|
|
|
/* Have to use that way, because the layout differs between
|
|
big endian and little endian */
|
|
mdev->state = (union drbd_state) {
|
|
{ .role = R_SECONDARY,
|
|
.peer = R_UNKNOWN,
|
|
.conn = C_STANDALONE,
|
|
.disk = D_DISKLESS,
|
|
.pdsk = D_UNKNOWN,
|
|
.susp = 0,
|
|
.susp_nod = 0,
|
|
.susp_fen = 0
|
|
} };
|
|
}
|
|
|
|
void drbd_init_set_defaults(struct drbd_conf *mdev)
|
|
{
|
|
/* the memset(,0,) did most of this.
|
|
* note: only assignments, no allocation in here */
|
|
|
|
drbd_set_defaults(mdev);
|
|
|
|
atomic_set(&mdev->ap_bio_cnt, 0);
|
|
atomic_set(&mdev->ap_pending_cnt, 0);
|
|
atomic_set(&mdev->rs_pending_cnt, 0);
|
|
atomic_set(&mdev->unacked_cnt, 0);
|
|
atomic_set(&mdev->local_cnt, 0);
|
|
atomic_set(&mdev->net_cnt, 0);
|
|
atomic_set(&mdev->packet_seq, 0);
|
|
atomic_set(&mdev->pp_in_use, 0);
|
|
atomic_set(&mdev->pp_in_use_by_net, 0);
|
|
atomic_set(&mdev->rs_sect_in, 0);
|
|
atomic_set(&mdev->rs_sect_ev, 0);
|
|
|
|
mutex_init(&mdev->md_io_mutex);
|
|
mutex_init(&mdev->data.mutex);
|
|
mutex_init(&mdev->meta.mutex);
|
|
sema_init(&mdev->data.work.s, 0);
|
|
sema_init(&mdev->meta.work.s, 0);
|
|
mutex_init(&mdev->state_mutex);
|
|
|
|
spin_lock_init(&mdev->data.work.q_lock);
|
|
spin_lock_init(&mdev->meta.work.q_lock);
|
|
|
|
spin_lock_init(&mdev->al_lock);
|
|
spin_lock_init(&mdev->req_lock);
|
|
spin_lock_init(&mdev->peer_seq_lock);
|
|
spin_lock_init(&mdev->epoch_lock);
|
|
|
|
INIT_LIST_HEAD(&mdev->active_ee);
|
|
INIT_LIST_HEAD(&mdev->sync_ee);
|
|
INIT_LIST_HEAD(&mdev->done_ee);
|
|
INIT_LIST_HEAD(&mdev->read_ee);
|
|
INIT_LIST_HEAD(&mdev->net_ee);
|
|
INIT_LIST_HEAD(&mdev->resync_reads);
|
|
INIT_LIST_HEAD(&mdev->data.work.q);
|
|
INIT_LIST_HEAD(&mdev->meta.work.q);
|
|
INIT_LIST_HEAD(&mdev->resync_work.list);
|
|
INIT_LIST_HEAD(&mdev->unplug_work.list);
|
|
INIT_LIST_HEAD(&mdev->go_diskless.list);
|
|
INIT_LIST_HEAD(&mdev->md_sync_work.list);
|
|
INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
|
|
|
|
mdev->resync_work.cb = w_resync_inactive;
|
|
mdev->unplug_work.cb = w_send_write_hint;
|
|
mdev->go_diskless.cb = w_go_diskless;
|
|
mdev->md_sync_work.cb = w_md_sync;
|
|
mdev->bm_io_work.w.cb = w_bitmap_io;
|
|
init_timer(&mdev->resync_timer);
|
|
init_timer(&mdev->md_sync_timer);
|
|
mdev->resync_timer.function = resync_timer_fn;
|
|
mdev->resync_timer.data = (unsigned long) mdev;
|
|
mdev->md_sync_timer.function = md_sync_timer_fn;
|
|
mdev->md_sync_timer.data = (unsigned long) mdev;
|
|
|
|
init_waitqueue_head(&mdev->misc_wait);
|
|
init_waitqueue_head(&mdev->state_wait);
|
|
init_waitqueue_head(&mdev->net_cnt_wait);
|
|
init_waitqueue_head(&mdev->ee_wait);
|
|
init_waitqueue_head(&mdev->al_wait);
|
|
init_waitqueue_head(&mdev->seq_wait);
|
|
|
|
drbd_thread_init(mdev, &mdev->receiver, drbdd_init);
|
|
drbd_thread_init(mdev, &mdev->worker, drbd_worker);
|
|
drbd_thread_init(mdev, &mdev->asender, drbd_asender);
|
|
|
|
mdev->agreed_pro_version = PRO_VERSION_MAX;
|
|
mdev->write_ordering = WO_bdev_flush;
|
|
mdev->resync_wenr = LC_FREE;
|
|
}
|
|
|
|
void drbd_mdev_cleanup(struct drbd_conf *mdev)
|
|
{
|
|
int i;
|
|
if (mdev->receiver.t_state != None)
|
|
dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
|
|
mdev->receiver.t_state);
|
|
|
|
/* no need to lock it, I'm the only thread alive */
|
|
if (atomic_read(&mdev->current_epoch->epoch_size) != 0)
|
|
dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size));
|
|
mdev->al_writ_cnt =
|
|
mdev->bm_writ_cnt =
|
|
mdev->read_cnt =
|
|
mdev->recv_cnt =
|
|
mdev->send_cnt =
|
|
mdev->writ_cnt =
|
|
mdev->p_size =
|
|
mdev->rs_start =
|
|
mdev->rs_total =
|
|
mdev->rs_failed = 0;
|
|
mdev->rs_last_events = 0;
|
|
mdev->rs_last_sect_ev = 0;
|
|
for (i = 0; i < DRBD_SYNC_MARKS; i++) {
|
|
mdev->rs_mark_left[i] = 0;
|
|
mdev->rs_mark_time[i] = 0;
|
|
}
|
|
D_ASSERT(mdev->net_conf == NULL);
|
|
|
|
drbd_set_my_capacity(mdev, 0);
|
|
if (mdev->bitmap) {
|
|
/* maybe never allocated. */
|
|
drbd_bm_resize(mdev, 0, 1);
|
|
drbd_bm_cleanup(mdev);
|
|
}
|
|
|
|
drbd_free_resources(mdev);
|
|
clear_bit(AL_SUSPENDED, &mdev->flags);
|
|
|
|
/*
|
|
* currently we drbd_init_ee only on module load, so
|
|
* we may do drbd_release_ee only on module unload!
|
|
*/
|
|
D_ASSERT(list_empty(&mdev->active_ee));
|
|
D_ASSERT(list_empty(&mdev->sync_ee));
|
|
D_ASSERT(list_empty(&mdev->done_ee));
|
|
D_ASSERT(list_empty(&mdev->read_ee));
|
|
D_ASSERT(list_empty(&mdev->net_ee));
|
|
D_ASSERT(list_empty(&mdev->resync_reads));
|
|
D_ASSERT(list_empty(&mdev->data.work.q));
|
|
D_ASSERT(list_empty(&mdev->meta.work.q));
|
|
D_ASSERT(list_empty(&mdev->resync_work.list));
|
|
D_ASSERT(list_empty(&mdev->unplug_work.list));
|
|
D_ASSERT(list_empty(&mdev->go_diskless.list));
|
|
}
|
|
|
|
|
|
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(atomic_read(&drbd_pp_vacant)==0); */
|
|
|
|
if (drbd_ee_mempool)
|
|
mempool_destroy(drbd_ee_mempool);
|
|
if (drbd_request_mempool)
|
|
mempool_destroy(drbd_request_mempool);
|
|
if (drbd_ee_cache)
|
|
kmem_cache_destroy(drbd_ee_cache);
|
|
if (drbd_request_cache)
|
|
kmem_cache_destroy(drbd_request_cache);
|
|
if (drbd_bm_ext_cache)
|
|
kmem_cache_destroy(drbd_bm_ext_cache);
|
|
if (drbd_al_ext_cache)
|
|
kmem_cache_destroy(drbd_al_ext_cache);
|
|
|
|
drbd_ee_mempool = NULL;
|
|
drbd_request_mempool = NULL;
|
|
drbd_ee_cache = NULL;
|
|
drbd_request_cache = NULL;
|
|
drbd_bm_ext_cache = NULL;
|
|
drbd_al_ext_cache = NULL;
|
|
|
|
return;
|
|
}
|
|
|
|
static int drbd_create_mempools(void)
|
|
{
|
|
struct page *page;
|
|
const int number = (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE) * minor_count;
|
|
int i;
|
|
|
|
/* prepare our caches and mempools */
|
|
drbd_request_mempool = NULL;
|
|
drbd_ee_cache = NULL;
|
|
drbd_request_cache = NULL;
|
|
drbd_bm_ext_cache = NULL;
|
|
drbd_al_ext_cache = NULL;
|
|
drbd_pp_pool = NULL;
|
|
|
|
/* 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_epoch_entry), 0, 0, NULL);
|
|
if (drbd_ee_cache == NULL)
|
|
goto Enomem;
|
|
|
|
drbd_bm_ext_cache = kmem_cache_create(
|
|
"drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
|
|
if (drbd_bm_ext_cache == NULL)
|
|
goto Enomem;
|
|
|
|
drbd_al_ext_cache = kmem_cache_create(
|
|
"drbd_al", sizeof(struct lc_element), 0, 0, NULL);
|
|
if (drbd_al_ext_cache == NULL)
|
|
goto Enomem;
|
|
|
|
/* mempools */
|
|
drbd_request_mempool = mempool_create(number,
|
|
mempool_alloc_slab, mempool_free_slab, drbd_request_cache);
|
|
if (drbd_request_mempool == NULL)
|
|
goto Enomem;
|
|
|
|
drbd_ee_mempool = mempool_create(number,
|
|
mempool_alloc_slab, mempool_free_slab, drbd_ee_cache);
|
|
if (drbd_ee_mempool == NULL)
|
|
goto Enomem;
|
|
|
|
/* drbd's page pool */
|
|
spin_lock_init(&drbd_pp_lock);
|
|
|
|
for (i = 0; i < number; i++) {
|
|
page = alloc_page(GFP_HIGHUSER);
|
|
if (!page)
|
|
goto Enomem;
|
|
set_page_private(page, (unsigned long)drbd_pp_pool);
|
|
drbd_pp_pool = page;
|
|
}
|
|
drbd_pp_vacant = number;
|
|
|
|
return 0;
|
|
|
|
Enomem:
|
|
drbd_destroy_mempools(); /* in case we allocated some */
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int drbd_notify_sys(struct notifier_block *this, unsigned long code,
|
|
void *unused)
|
|
{
|
|
/* just so we have it. you never know what interesting things we
|
|
* might want to do here some day...
|
|
*/
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block drbd_notifier = {
|
|
.notifier_call = drbd_notify_sys,
|
|
};
|
|
|
|
static void drbd_release_ee_lists(struct drbd_conf *mdev)
|
|
{
|
|
int rr;
|
|
|
|
rr = drbd_release_ee(mdev, &mdev->active_ee);
|
|
if (rr)
|
|
dev_err(DEV, "%d EEs in active list found!\n", rr);
|
|
|
|
rr = drbd_release_ee(mdev, &mdev->sync_ee);
|
|
if (rr)
|
|
dev_err(DEV, "%d EEs in sync list found!\n", rr);
|
|
|
|
rr = drbd_release_ee(mdev, &mdev->read_ee);
|
|
if (rr)
|
|
dev_err(DEV, "%d EEs in read list found!\n", rr);
|
|
|
|
rr = drbd_release_ee(mdev, &mdev->done_ee);
|
|
if (rr)
|
|
dev_err(DEV, "%d EEs in done list found!\n", rr);
|
|
|
|
rr = drbd_release_ee(mdev, &mdev->net_ee);
|
|
if (rr)
|
|
dev_err(DEV, "%d EEs in net list found!\n", rr);
|
|
}
|
|
|
|
/* caution. no locking.
|
|
* currently only used from module cleanup code. */
|
|
static void drbd_delete_device(unsigned int minor)
|
|
{
|
|
struct drbd_conf *mdev = minor_to_mdev(minor);
|
|
|
|
if (!mdev)
|
|
return;
|
|
|
|
/* paranoia asserts */
|
|
if (mdev->open_cnt != 0)
|
|
dev_err(DEV, "open_cnt = %d in %s:%u", mdev->open_cnt,
|
|
__FILE__ , __LINE__);
|
|
|
|
ERR_IF (!list_empty(&mdev->data.work.q)) {
|
|
struct list_head *lp;
|
|
list_for_each(lp, &mdev->data.work.q) {
|
|
dev_err(DEV, "lp = %p\n", lp);
|
|
}
|
|
};
|
|
/* end paranoia asserts */
|
|
|
|
del_gendisk(mdev->vdisk);
|
|
|
|
/* cleanup stuff that may have been allocated during
|
|
* device (re-)configuration or state changes */
|
|
|
|
if (mdev->this_bdev)
|
|
bdput(mdev->this_bdev);
|
|
|
|
drbd_free_resources(mdev);
|
|
|
|
drbd_release_ee_lists(mdev);
|
|
|
|
/* should be free'd on disconnect? */
|
|
kfree(mdev->ee_hash);
|
|
/*
|
|
mdev->ee_hash_s = 0;
|
|
mdev->ee_hash = NULL;
|
|
*/
|
|
|
|
lc_destroy(mdev->act_log);
|
|
lc_destroy(mdev->resync);
|
|
|
|
kfree(mdev->p_uuid);
|
|
/* mdev->p_uuid = NULL; */
|
|
|
|
kfree(mdev->int_dig_out);
|
|
kfree(mdev->int_dig_in);
|
|
kfree(mdev->int_dig_vv);
|
|
|
|
/* cleanup the rest that has been
|
|
* allocated from drbd_new_device
|
|
* and actually free the mdev itself */
|
|
drbd_free_mdev(mdev);
|
|
}
|
|
|
|
static void drbd_cleanup(void)
|
|
{
|
|
unsigned int i;
|
|
|
|
unregister_reboot_notifier(&drbd_notifier);
|
|
|
|
drbd_nl_cleanup();
|
|
|
|
if (minor_table) {
|
|
if (drbd_proc)
|
|
remove_proc_entry("drbd", NULL);
|
|
i = minor_count;
|
|
while (i--)
|
|
drbd_delete_device(i);
|
|
drbd_destroy_mempools();
|
|
}
|
|
|
|
kfree(minor_table);
|
|
|
|
unregister_blkdev(DRBD_MAJOR, "drbd");
|
|
|
|
printk(KERN_INFO "drbd: module cleanup done.\n");
|
|
}
|
|
|
|
/**
|
|
* drbd_congested() - Callback for pdflush
|
|
* @congested_data: User data
|
|
* @bdi_bits: Bits pdflush is currently interested in
|
|
*
|
|
* Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
|
|
*/
|
|
static int drbd_congested(void *congested_data, int bdi_bits)
|
|
{
|
|
struct drbd_conf *mdev = congested_data;
|
|
struct request_queue *q;
|
|
char reason = '-';
|
|
int r = 0;
|
|
|
|
if (!__inc_ap_bio_cond(mdev)) {
|
|
/* DRBD has frozen IO */
|
|
r = bdi_bits;
|
|
reason = 'd';
|
|
goto out;
|
|
}
|
|
|
|
if (get_ldev(mdev)) {
|
|
q = bdev_get_queue(mdev->ldev->backing_bdev);
|
|
r = bdi_congested(&q->backing_dev_info, bdi_bits);
|
|
put_ldev(mdev);
|
|
if (r)
|
|
reason = 'b';
|
|
}
|
|
|
|
if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->flags)) {
|
|
r |= (1 << BDI_async_congested);
|
|
reason = reason == 'b' ? 'a' : 'n';
|
|
}
|
|
|
|
out:
|
|
mdev->congestion_reason = reason;
|
|
return r;
|
|
}
|
|
|
|
struct drbd_conf *drbd_new_device(unsigned int minor)
|
|
{
|
|
struct drbd_conf *mdev;
|
|
struct gendisk *disk;
|
|
struct request_queue *q;
|
|
|
|
/* GFP_KERNEL, we are outside of all write-out paths */
|
|
mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
|
|
if (!mdev)
|
|
return NULL;
|
|
if (!zalloc_cpumask_var(&mdev->cpu_mask, GFP_KERNEL))
|
|
goto out_no_cpumask;
|
|
|
|
mdev->minor = minor;
|
|
|
|
drbd_init_set_defaults(mdev);
|
|
|
|
q = blk_alloc_queue(GFP_KERNEL);
|
|
if (!q)
|
|
goto out_no_q;
|
|
mdev->rq_queue = q;
|
|
q->queuedata = mdev;
|
|
|
|
disk = alloc_disk(1);
|
|
if (!disk)
|
|
goto out_no_disk;
|
|
mdev->vdisk = disk;
|
|
|
|
set_disk_ro(disk, TRUE);
|
|
|
|
disk->queue = q;
|
|
disk->major = DRBD_MAJOR;
|
|
disk->first_minor = minor;
|
|
disk->fops = &drbd_ops;
|
|
sprintf(disk->disk_name, "drbd%d", minor);
|
|
disk->private_data = mdev;
|
|
|
|
mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
|
|
/* we have no partitions. we contain only ourselves. */
|
|
mdev->this_bdev->bd_contains = mdev->this_bdev;
|
|
|
|
q->backing_dev_info.congested_fn = drbd_congested;
|
|
q->backing_dev_info.congested_data = mdev;
|
|
|
|
blk_queue_make_request(q, drbd_make_request_26);
|
|
blk_queue_max_segment_size(q, DRBD_MAX_SEGMENT_SIZE);
|
|
blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
|
|
blk_queue_merge_bvec(q, drbd_merge_bvec);
|
|
q->queue_lock = &mdev->req_lock; /* needed since we use */
|
|
/* plugging on a queue, that actually has no requests! */
|
|
q->unplug_fn = drbd_unplug_fn;
|
|
|
|
mdev->md_io_page = alloc_page(GFP_KERNEL);
|
|
if (!mdev->md_io_page)
|
|
goto out_no_io_page;
|
|
|
|
if (drbd_bm_init(mdev))
|
|
goto out_no_bitmap;
|
|
/* no need to lock access, we are still initializing this minor device. */
|
|
if (!tl_init(mdev))
|
|
goto out_no_tl;
|
|
|
|
mdev->app_reads_hash = kzalloc(APP_R_HSIZE*sizeof(void *), GFP_KERNEL);
|
|
if (!mdev->app_reads_hash)
|
|
goto out_no_app_reads;
|
|
|
|
mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
|
|
if (!mdev->current_epoch)
|
|
goto out_no_epoch;
|
|
|
|
INIT_LIST_HEAD(&mdev->current_epoch->list);
|
|
mdev->epochs = 1;
|
|
|
|
return mdev;
|
|
|
|
/* out_whatever_else:
|
|
kfree(mdev->current_epoch); */
|
|
out_no_epoch:
|
|
kfree(mdev->app_reads_hash);
|
|
out_no_app_reads:
|
|
tl_cleanup(mdev);
|
|
out_no_tl:
|
|
drbd_bm_cleanup(mdev);
|
|
out_no_bitmap:
|
|
__free_page(mdev->md_io_page);
|
|
out_no_io_page:
|
|
put_disk(disk);
|
|
out_no_disk:
|
|
blk_cleanup_queue(q);
|
|
out_no_q:
|
|
free_cpumask_var(mdev->cpu_mask);
|
|
out_no_cpumask:
|
|
kfree(mdev);
|
|
return NULL;
|
|
}
|
|
|
|
/* counterpart of drbd_new_device.
|
|
* last part of drbd_delete_device. */
|
|
void drbd_free_mdev(struct drbd_conf *mdev)
|
|
{
|
|
kfree(mdev->current_epoch);
|
|
kfree(mdev->app_reads_hash);
|
|
tl_cleanup(mdev);
|
|
if (mdev->bitmap) /* should no longer be there. */
|
|
drbd_bm_cleanup(mdev);
|
|
__free_page(mdev->md_io_page);
|
|
put_disk(mdev->vdisk);
|
|
blk_cleanup_queue(mdev->rq_queue);
|
|
free_cpumask_var(mdev->cpu_mask);
|
|
kfree(mdev);
|
|
}
|
|
|
|
|
|
int __init drbd_init(void)
|
|
{
|
|
int err;
|
|
|
|
if (sizeof(struct p_handshake) != 80) {
|
|
printk(KERN_ERR
|
|
"drbd: never change the size or layout "
|
|
"of the HandShake packet.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (1 > minor_count || minor_count > 255) {
|
|
printk(KERN_ERR
|
|
"drbd: invalid minor_count (%d)\n", minor_count);
|
|
#ifdef MODULE
|
|
return -EINVAL;
|
|
#else
|
|
minor_count = 8;
|
|
#endif
|
|
}
|
|
|
|
err = drbd_nl_init();
|
|
if (err)
|
|
return err;
|
|
|
|
err = register_blkdev(DRBD_MAJOR, "drbd");
|
|
if (err) {
|
|
printk(KERN_ERR
|
|
"drbd: unable to register block device major %d\n",
|
|
DRBD_MAJOR);
|
|
return err;
|
|
}
|
|
|
|
register_reboot_notifier(&drbd_notifier);
|
|
|
|
/*
|
|
* allocate all necessary structs
|
|
*/
|
|
err = -ENOMEM;
|
|
|
|
init_waitqueue_head(&drbd_pp_wait);
|
|
|
|
drbd_proc = NULL; /* play safe for drbd_cleanup */
|
|
minor_table = kzalloc(sizeof(struct drbd_conf *)*minor_count,
|
|
GFP_KERNEL);
|
|
if (!minor_table)
|
|
goto Enomem;
|
|
|
|
err = drbd_create_mempools();
|
|
if (err)
|
|
goto Enomem;
|
|
|
|
drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
|
|
if (!drbd_proc) {
|
|
printk(KERN_ERR "drbd: unable to register proc file\n");
|
|
goto Enomem;
|
|
}
|
|
|
|
rwlock_init(&global_state_lock);
|
|
|
|
printk(KERN_INFO "drbd: initialized. "
|
|
"Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
|
|
API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
|
|
printk(KERN_INFO "drbd: %s\n", drbd_buildtag());
|
|
printk(KERN_INFO "drbd: registered as block device major %d\n",
|
|
DRBD_MAJOR);
|
|
printk(KERN_INFO "drbd: minor_table @ 0x%p\n", minor_table);
|
|
|
|
return 0; /* Success! */
|
|
|
|
Enomem:
|
|
drbd_cleanup();
|
|
if (err == -ENOMEM)
|
|
/* currently always the case */
|
|
printk(KERN_ERR "drbd: ran out of memory\n");
|
|
else
|
|
printk(KERN_ERR "drbd: initialization failure\n");
|
|
return err;
|
|
}
|
|
|
|
void drbd_free_bc(struct drbd_backing_dev *ldev)
|
|
{
|
|
if (ldev == NULL)
|
|
return;
|
|
|
|
blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
|
|
blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
|
|
|
|
kfree(ldev);
|
|
}
|
|
|
|
void drbd_free_sock(struct drbd_conf *mdev)
|
|
{
|
|
if (mdev->data.socket) {
|
|
mutex_lock(&mdev->data.mutex);
|
|
kernel_sock_shutdown(mdev->data.socket, SHUT_RDWR);
|
|
sock_release(mdev->data.socket);
|
|
mdev->data.socket = NULL;
|
|
mutex_unlock(&mdev->data.mutex);
|
|
}
|
|
if (mdev->meta.socket) {
|
|
mutex_lock(&mdev->meta.mutex);
|
|
kernel_sock_shutdown(mdev->meta.socket, SHUT_RDWR);
|
|
sock_release(mdev->meta.socket);
|
|
mdev->meta.socket = NULL;
|
|
mutex_unlock(&mdev->meta.mutex);
|
|
}
|
|
}
|
|
|
|
|
|
void drbd_free_resources(struct drbd_conf *mdev)
|
|
{
|
|
crypto_free_hash(mdev->csums_tfm);
|
|
mdev->csums_tfm = NULL;
|
|
crypto_free_hash(mdev->verify_tfm);
|
|
mdev->verify_tfm = NULL;
|
|
crypto_free_hash(mdev->cram_hmac_tfm);
|
|
mdev->cram_hmac_tfm = NULL;
|
|
crypto_free_hash(mdev->integrity_w_tfm);
|
|
mdev->integrity_w_tfm = NULL;
|
|
crypto_free_hash(mdev->integrity_r_tfm);
|
|
mdev->integrity_r_tfm = NULL;
|
|
|
|
drbd_free_sock(mdev);
|
|
|
|
__no_warn(local,
|
|
drbd_free_bc(mdev->ldev);
|
|
mdev->ldev = NULL;);
|
|
}
|
|
|
|
/* meta data management */
|
|
|
|
struct meta_data_on_disk {
|
|
u64 la_size; /* 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 */
|
|
/* `-- act_log->nr_elements <-- sync_conf.al_extents */
|
|
u32 bm_offset; /* offset to the bitmap, from here */
|
|
u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
|
|
u32 reserved_u32[4];
|
|
|
|
} __packed;
|
|
|
|
/**
|
|
* drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
|
|
* @mdev: DRBD device.
|
|
*/
|
|
void drbd_md_sync(struct drbd_conf *mdev)
|
|
{
|
|
struct meta_data_on_disk *buffer;
|
|
sector_t sector;
|
|
int i;
|
|
|
|
del_timer(&mdev->md_sync_timer);
|
|
/* timer may be rearmed by drbd_md_mark_dirty() now. */
|
|
if (!test_and_clear_bit(MD_DIRTY, &mdev->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(mdev, D_FAILED))
|
|
return;
|
|
|
|
mutex_lock(&mdev->md_io_mutex);
|
|
buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
|
|
memset(buffer, 0, 512);
|
|
|
|
buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
|
|
for (i = UI_CURRENT; i < UI_SIZE; i++)
|
|
buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]);
|
|
buffer->flags = cpu_to_be32(mdev->ldev->md.flags);
|
|
buffer->magic = cpu_to_be32(DRBD_MD_MAGIC);
|
|
|
|
buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect);
|
|
buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset);
|
|
buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements);
|
|
buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
|
|
buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid);
|
|
|
|
buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset);
|
|
|
|
D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset);
|
|
sector = mdev->ldev->md.md_offset;
|
|
|
|
if (!drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) {
|
|
/* this was a try anyways ... */
|
|
dev_err(DEV, "meta data update failed!\n");
|
|
drbd_chk_io_error(mdev, 1, TRUE);
|
|
}
|
|
|
|
/* Update mdev->ldev->md.la_size_sect,
|
|
* since we updated it on metadata. */
|
|
mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
|
|
|
|
mutex_unlock(&mdev->md_io_mutex);
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
/**
|
|
* drbd_md_read() - Reads in the meta data super block
|
|
* @mdev: DRBD device.
|
|
* @bdev: Device from which the meta data should be read in.
|
|
*
|
|
* Return 0 (NO_ERROR) on success, and an enum drbd_ret_codes in case
|
|
* something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID.
|
|
*/
|
|
int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
|
|
{
|
|
struct meta_data_on_disk *buffer;
|
|
int i, rv = NO_ERROR;
|
|
|
|
if (!get_ldev_if_state(mdev, D_ATTACHING))
|
|
return ERR_IO_MD_DISK;
|
|
|
|
mutex_lock(&mdev->md_io_mutex);
|
|
buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
|
|
|
|
if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
|
|
/* NOTE: cant do normal error processing here as this is
|
|
called BEFORE disk is attached */
|
|
dev_err(DEV, "Error while reading metadata.\n");
|
|
rv = ERR_IO_MD_DISK;
|
|
goto err;
|
|
}
|
|
|
|
if (be32_to_cpu(buffer->magic) != DRBD_MD_MAGIC) {
|
|
dev_err(DEV, "Error while reading metadata, magic not found.\n");
|
|
rv = ERR_MD_INVALID;
|
|
goto err;
|
|
}
|
|
if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) {
|
|
dev_err(DEV, "unexpected al_offset: %d (expected %d)\n",
|
|
be32_to_cpu(buffer->al_offset), bdev->md.al_offset);
|
|
rv = ERR_MD_INVALID;
|
|
goto err;
|
|
}
|
|
if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
|
|
dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n",
|
|
be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
|
|
rv = ERR_MD_INVALID;
|
|
goto err;
|
|
}
|
|
if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
|
|
dev_err(DEV, "unexpected md_size: %u (expected %u)\n",
|
|
be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
|
|
rv = ERR_MD_INVALID;
|
|
goto err;
|
|
}
|
|
|
|
if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
|
|
dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
|
|
be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
|
|
rv = ERR_MD_INVALID;
|
|
goto err;
|
|
}
|
|
|
|
bdev->md.la_size_sect = be64_to_cpu(buffer->la_size);
|
|
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);
|
|
mdev->sync_conf.al_extents = be32_to_cpu(buffer->al_nr_extents);
|
|
bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
|
|
|
|
if (mdev->sync_conf.al_extents < 7)
|
|
mdev->sync_conf.al_extents = 127;
|
|
|
|
err:
|
|
mutex_unlock(&mdev->md_io_mutex);
|
|
put_ldev(mdev);
|
|
|
|
return rv;
|
|
}
|
|
|
|
static void debug_drbd_uuid(struct drbd_conf *mdev, enum drbd_uuid_index index)
|
|
{
|
|
static char *uuid_str[UI_EXTENDED_SIZE] = {
|
|
[UI_CURRENT] = "CURRENT",
|
|
[UI_BITMAP] = "BITMAP",
|
|
[UI_HISTORY_START] = "HISTORY_START",
|
|
[UI_HISTORY_END] = "HISTORY_END",
|
|
[UI_SIZE] = "SIZE",
|
|
[UI_FLAGS] = "FLAGS",
|
|
};
|
|
|
|
if (index >= UI_EXTENDED_SIZE) {
|
|
dev_warn(DEV, " uuid_index >= EXTENDED_SIZE\n");
|
|
return;
|
|
}
|
|
|
|
dynamic_dev_dbg(DEV, " uuid[%s] now %016llX\n",
|
|
uuid_str[index],
|
|
(unsigned long long)mdev->ldev->md.uuid[index]);
|
|
}
|
|
|
|
|
|
/**
|
|
* drbd_md_mark_dirty() - Mark meta data super block as dirty
|
|
* @mdev: DRBD device.
|
|
*
|
|
* Call this function if you change anything that should be written to
|
|
* the meta-data super block. This function sets MD_DIRTY, and starts a
|
|
* timer that ensures that within five seconds you have to call drbd_md_sync().
|
|
*/
|
|
#ifdef DEBUG
|
|
void drbd_md_mark_dirty_(struct drbd_conf *mdev, unsigned int line, const char *func)
|
|
{
|
|
if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) {
|
|
mod_timer(&mdev->md_sync_timer, jiffies + HZ);
|
|
mdev->last_md_mark_dirty.line = line;
|
|
mdev->last_md_mark_dirty.func = func;
|
|
}
|
|
}
|
|
#else
|
|
void drbd_md_mark_dirty(struct drbd_conf *mdev)
|
|
{
|
|
if (!test_and_set_bit(MD_DIRTY, &mdev->flags))
|
|
mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ);
|
|
}
|
|
#endif
|
|
|
|
static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local)
|
|
{
|
|
int i;
|
|
|
|
for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++) {
|
|
mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i];
|
|
debug_drbd_uuid(mdev, i+1);
|
|
}
|
|
}
|
|
|
|
void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
|
|
{
|
|
if (idx == UI_CURRENT) {
|
|
if (mdev->state.role == R_PRIMARY)
|
|
val |= 1;
|
|
else
|
|
val &= ~((u64)1);
|
|
|
|
drbd_set_ed_uuid(mdev, val);
|
|
}
|
|
|
|
mdev->ldev->md.uuid[idx] = val;
|
|
debug_drbd_uuid(mdev, idx);
|
|
drbd_md_mark_dirty(mdev);
|
|
}
|
|
|
|
|
|
void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
|
|
{
|
|
if (mdev->ldev->md.uuid[idx]) {
|
|
drbd_uuid_move_history(mdev);
|
|
mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx];
|
|
debug_drbd_uuid(mdev, UI_HISTORY_START);
|
|
}
|
|
_drbd_uuid_set(mdev, idx, val);
|
|
}
|
|
|
|
/**
|
|
* drbd_uuid_new_current() - Creates a new current UUID
|
|
* @mdev: 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_conf *mdev) __must_hold(local)
|
|
{
|
|
u64 val;
|
|
|
|
dev_info(DEV, "Creating new current UUID\n");
|
|
D_ASSERT(mdev->ldev->md.uuid[UI_BITMAP] == 0);
|
|
mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT];
|
|
debug_drbd_uuid(mdev, UI_BITMAP);
|
|
|
|
get_random_bytes(&val, sizeof(u64));
|
|
_drbd_uuid_set(mdev, UI_CURRENT, val);
|
|
/* get it to stable storage _now_ */
|
|
drbd_md_sync(mdev);
|
|
}
|
|
|
|
void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local)
|
|
{
|
|
if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
|
|
return;
|
|
|
|
if (val == 0) {
|
|
drbd_uuid_move_history(mdev);
|
|
mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP];
|
|
mdev->ldev->md.uuid[UI_BITMAP] = 0;
|
|
debug_drbd_uuid(mdev, UI_HISTORY_START);
|
|
debug_drbd_uuid(mdev, UI_BITMAP);
|
|
} else {
|
|
if (mdev->ldev->md.uuid[UI_BITMAP])
|
|
dev_warn(DEV, "bm UUID already set");
|
|
|
|
mdev->ldev->md.uuid[UI_BITMAP] = val;
|
|
mdev->ldev->md.uuid[UI_BITMAP] &= ~((u64)1);
|
|
|
|
debug_drbd_uuid(mdev, UI_BITMAP);
|
|
}
|
|
drbd_md_mark_dirty(mdev);
|
|
}
|
|
|
|
/**
|
|
* drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
|
|
* @mdev: DRBD device.
|
|
*
|
|
* Sets all bits in the bitmap and writes the whole bitmap to stable storage.
|
|
*/
|
|
int drbd_bmio_set_n_write(struct drbd_conf *mdev)
|
|
{
|
|
int rv = -EIO;
|
|
|
|
if (get_ldev_if_state(mdev, D_ATTACHING)) {
|
|
drbd_md_set_flag(mdev, MDF_FULL_SYNC);
|
|
drbd_md_sync(mdev);
|
|
drbd_bm_set_all(mdev);
|
|
|
|
rv = drbd_bm_write(mdev);
|
|
|
|
if (!rv) {
|
|
drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
|
|
drbd_md_sync(mdev);
|
|
}
|
|
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
|
|
* @mdev: DRBD device.
|
|
*
|
|
* Clears all bits in the bitmap and writes the whole bitmap to stable storage.
|
|
*/
|
|
int drbd_bmio_clear_n_write(struct drbd_conf *mdev)
|
|
{
|
|
int rv = -EIO;
|
|
|
|
drbd_resume_al(mdev);
|
|
if (get_ldev_if_state(mdev, D_ATTACHING)) {
|
|
drbd_bm_clear_all(mdev);
|
|
rv = drbd_bm_write(mdev);
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused)
|
|
{
|
|
struct bm_io_work *work = container_of(w, struct bm_io_work, w);
|
|
int rv;
|
|
|
|
D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
|
|
|
|
drbd_bm_lock(mdev, work->why);
|
|
rv = work->io_fn(mdev);
|
|
drbd_bm_unlock(mdev);
|
|
|
|
clear_bit(BITMAP_IO, &mdev->flags);
|
|
wake_up(&mdev->misc_wait);
|
|
|
|
if (work->done)
|
|
work->done(mdev, rv);
|
|
|
|
clear_bit(BITMAP_IO_QUEUED, &mdev->flags);
|
|
work->why = NULL;
|
|
|
|
return 1;
|
|
}
|
|
|
|
void drbd_ldev_destroy(struct drbd_conf *mdev)
|
|
{
|
|
lc_destroy(mdev->resync);
|
|
mdev->resync = NULL;
|
|
lc_destroy(mdev->act_log);
|
|
mdev->act_log = NULL;
|
|
__no_warn(local,
|
|
drbd_free_bc(mdev->ldev);
|
|
mdev->ldev = NULL;);
|
|
|
|
if (mdev->md_io_tmpp) {
|
|
__free_page(mdev->md_io_tmpp);
|
|
mdev->md_io_tmpp = NULL;
|
|
}
|
|
clear_bit(GO_DISKLESS, &mdev->flags);
|
|
}
|
|
|
|
static int w_go_diskless(struct drbd_conf *mdev, struct drbd_work *w, int unused)
|
|
{
|
|
D_ASSERT(mdev->state.disk == D_FAILED);
|
|
/* we cannot assert local_cnt == 0 here, as get_ldev_if_state will
|
|
* inc/dec it frequently. Once we are D_DISKLESS, no one will touch
|
|
* the protected members anymore, though, so once put_ldev reaches zero
|
|
* again, it will be safe to free them. */
|
|
drbd_force_state(mdev, NS(disk, D_DISKLESS));
|
|
return 1;
|
|
}
|
|
|
|
void drbd_go_diskless(struct drbd_conf *mdev)
|
|
{
|
|
D_ASSERT(mdev->state.disk == D_FAILED);
|
|
if (!test_and_set_bit(GO_DISKLESS, &mdev->flags))
|
|
drbd_queue_work(&mdev->data.work, &mdev->go_diskless);
|
|
}
|
|
|
|
/**
|
|
* drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
|
|
* @mdev: DRBD device.
|
|
* @io_fn: IO callback to be called when bitmap IO is possible
|
|
* @done: callback to be called after the bitmap IO was performed
|
|
* @why: Descriptive text of the reason for doing the IO
|
|
*
|
|
* While IO on the bitmap happens we freeze application IO thus we ensure
|
|
* that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
|
|
* called from worker context. It MUST NOT be used while a previous such
|
|
* work is still pending!
|
|
*/
|
|
void drbd_queue_bitmap_io(struct drbd_conf *mdev,
|
|
int (*io_fn)(struct drbd_conf *),
|
|
void (*done)(struct drbd_conf *, int),
|
|
char *why)
|
|
{
|
|
D_ASSERT(current == mdev->worker.task);
|
|
|
|
D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags));
|
|
D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags));
|
|
D_ASSERT(list_empty(&mdev->bm_io_work.w.list));
|
|
if (mdev->bm_io_work.why)
|
|
dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n",
|
|
why, mdev->bm_io_work.why);
|
|
|
|
mdev->bm_io_work.io_fn = io_fn;
|
|
mdev->bm_io_work.done = done;
|
|
mdev->bm_io_work.why = why;
|
|
|
|
set_bit(BITMAP_IO, &mdev->flags);
|
|
if (atomic_read(&mdev->ap_bio_cnt) == 0) {
|
|
if (list_empty(&mdev->bm_io_work.w.list)) {
|
|
set_bit(BITMAP_IO_QUEUED, &mdev->flags);
|
|
drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w);
|
|
} else
|
|
dev_err(DEV, "FIXME avoided double queuing bm_io_work\n");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* drbd_bitmap_io() - Does an IO operation on the whole bitmap
|
|
* @mdev: DRBD device.
|
|
* @io_fn: IO callback to be called when bitmap IO is possible
|
|
* @why: Descriptive text of the reason for doing the IO
|
|
*
|
|
* freezes application IO while that the actual IO operations runs. This
|
|
* functions MAY NOT be called from worker context.
|
|
*/
|
|
int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
|
|
{
|
|
int rv;
|
|
|
|
D_ASSERT(current != mdev->worker.task);
|
|
|
|
drbd_suspend_io(mdev);
|
|
|
|
drbd_bm_lock(mdev, why);
|
|
rv = io_fn(mdev);
|
|
drbd_bm_unlock(mdev);
|
|
|
|
drbd_resume_io(mdev);
|
|
|
|
return rv;
|
|
}
|
|
|
|
void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
|
|
{
|
|
if ((mdev->ldev->md.flags & flag) != flag) {
|
|
drbd_md_mark_dirty(mdev);
|
|
mdev->ldev->md.flags |= flag;
|
|
}
|
|
}
|
|
|
|
void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
|
|
{
|
|
if ((mdev->ldev->md.flags & flag) != 0) {
|
|
drbd_md_mark_dirty(mdev);
|
|
mdev->ldev->md.flags &= ~flag;
|
|
}
|
|
}
|
|
int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
|
|
{
|
|
return (bdev->md.flags & flag) != 0;
|
|
}
|
|
|
|
static void md_sync_timer_fn(unsigned long data)
|
|
{
|
|
struct drbd_conf *mdev = (struct drbd_conf *) data;
|
|
|
|
drbd_queue_work_front(&mdev->data.work, &mdev->md_sync_work);
|
|
}
|
|
|
|
static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused)
|
|
{
|
|
dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
|
|
#ifdef DEBUG
|
|
dev_warn(DEV, "last md_mark_dirty: %s:%u\n",
|
|
mdev->last_md_mark_dirty.func, mdev->last_md_mark_dirty.line);
|
|
#endif
|
|
drbd_md_sync(mdev);
|
|
return 1;
|
|
}
|
|
|
|
#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_conf *mdev, unsigned int type)
|
|
{
|
|
static struct fault_random_state rrs = {0, 0};
|
|
|
|
unsigned int ret = (
|
|
(fault_devs == 0 ||
|
|
((1 << mdev_to_minor(mdev)) & fault_devs) != 0) &&
|
|
(((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
|
|
|
|
if (ret) {
|
|
fault_count++;
|
|
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_warn(DEV, "***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 CONFIG_MODULES
|
|
if (THIS_MODULE != NULL)
|
|
sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
|
|
else
|
|
#endif
|
|
buildtag[0] = 'b';
|
|
}
|
|
|
|
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);
|