![NeilBrown](/assets/img/avatar_default.png)
The conditions that cause these calls to MD_BUG are not kernel bugs, just oddities in what userspace is asking for. Also convert analyze_sbs to return void, and the value it returned was always 0. Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
3749 lines
87 KiB
C
3749 lines
87 KiB
C
/*
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md.c : Multiple Devices driver for Linux
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Copyright (C) 1998, 1999, 2000 Ingo Molnar
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completely rewritten, based on the MD driver code from Marc Zyngier
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Changes:
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- RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
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- RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
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- boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
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- kerneld support by Boris Tobotras <boris@xtalk.msk.su>
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- kmod support by: Cyrus Durgin
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- RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
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- Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
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- lots of fixes and improvements to the RAID1/RAID5 and generic
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RAID code (such as request based resynchronization):
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Neil Brown <neilb@cse.unsw.edu.au>.
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This program 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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You should have received a copy of the GNU General Public License
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(for example /usr/src/linux/COPYING); if not, write to the Free
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Software Foundation, Inc., 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/config.h>
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#include <linux/linkage.h>
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#include <linux/raid/md.h>
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#include <linux/sysctl.h>
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#include <linux/devfs_fs_kernel.h>
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#include <linux/buffer_head.h> /* for invalidate_bdev */
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#include <linux/suspend.h>
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#include <linux/init.h>
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#ifdef CONFIG_KMOD
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#include <linux/kmod.h>
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#endif
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#include <asm/unaligned.h>
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#define MAJOR_NR MD_MAJOR
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#define MD_DRIVER
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/* 63 partitions with the alternate major number (mdp) */
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#define MdpMinorShift 6
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#define DEBUG 0
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#define dprintk(x...) ((void)(DEBUG && printk(x)))
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#ifndef MODULE
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static void autostart_arrays (int part);
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#endif
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static mdk_personality_t *pers[MAX_PERSONALITY];
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static DEFINE_SPINLOCK(pers_lock);
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/*
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* Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
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* is 1000 KB/sec, so the extra system load does not show up that much.
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* Increase it if you want to have more _guaranteed_ speed. Note that
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* the RAID driver will use the maximum available bandwith if the IO
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* subsystem is idle. There is also an 'absolute maximum' reconstruction
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* speed limit - in case reconstruction slows down your system despite
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* idle IO detection.
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*
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* you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
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*/
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static int sysctl_speed_limit_min = 1000;
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static int sysctl_speed_limit_max = 200000;
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static struct ctl_table_header *raid_table_header;
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static ctl_table raid_table[] = {
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{
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.ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
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.procname = "speed_limit_min",
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.data = &sysctl_speed_limit_min,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
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.procname = "speed_limit_max",
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.data = &sysctl_speed_limit_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table raid_dir_table[] = {
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{
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.ctl_name = DEV_RAID,
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.procname = "raid",
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.maxlen = 0,
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.mode = 0555,
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.child = raid_table,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table raid_root_table[] = {
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{
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.ctl_name = CTL_DEV,
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.procname = "dev",
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.maxlen = 0,
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.mode = 0555,
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.child = raid_dir_table,
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},
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{ .ctl_name = 0 }
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};
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static struct block_device_operations md_fops;
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/*
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* Enables to iterate over all existing md arrays
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* all_mddevs_lock protects this list.
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*/
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static LIST_HEAD(all_mddevs);
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static DEFINE_SPINLOCK(all_mddevs_lock);
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/*
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* iterates through all used mddevs in the system.
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* We take care to grab the all_mddevs_lock whenever navigating
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* the list, and to always hold a refcount when unlocked.
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* Any code which breaks out of this loop while own
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* a reference to the current mddev and must mddev_put it.
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*/
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#define ITERATE_MDDEV(mddev,tmp) \
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\
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for (({ spin_lock(&all_mddevs_lock); \
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tmp = all_mddevs.next; \
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mddev = NULL;}); \
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({ if (tmp != &all_mddevs) \
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mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
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spin_unlock(&all_mddevs_lock); \
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if (mddev) mddev_put(mddev); \
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mddev = list_entry(tmp, mddev_t, all_mddevs); \
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tmp != &all_mddevs;}); \
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({ spin_lock(&all_mddevs_lock); \
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tmp = tmp->next;}) \
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)
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static int md_fail_request (request_queue_t *q, struct bio *bio)
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{
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bio_io_error(bio, bio->bi_size);
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return 0;
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}
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static inline mddev_t *mddev_get(mddev_t *mddev)
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{
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atomic_inc(&mddev->active);
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return mddev;
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}
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static void mddev_put(mddev_t *mddev)
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{
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if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
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return;
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if (!mddev->raid_disks && list_empty(&mddev->disks)) {
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list_del(&mddev->all_mddevs);
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blk_put_queue(mddev->queue);
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kfree(mddev);
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}
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spin_unlock(&all_mddevs_lock);
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}
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static mddev_t * mddev_find(dev_t unit)
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{
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mddev_t *mddev, *new = NULL;
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retry:
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spin_lock(&all_mddevs_lock);
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list_for_each_entry(mddev, &all_mddevs, all_mddevs)
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if (mddev->unit == unit) {
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mddev_get(mddev);
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spin_unlock(&all_mddevs_lock);
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if (new)
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kfree(new);
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return mddev;
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}
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if (new) {
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list_add(&new->all_mddevs, &all_mddevs);
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spin_unlock(&all_mddevs_lock);
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return new;
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}
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spin_unlock(&all_mddevs_lock);
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new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL);
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if (!new)
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return NULL;
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memset(new, 0, sizeof(*new));
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new->unit = unit;
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if (MAJOR(unit) == MD_MAJOR)
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new->md_minor = MINOR(unit);
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else
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new->md_minor = MINOR(unit) >> MdpMinorShift;
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init_MUTEX(&new->reconfig_sem);
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INIT_LIST_HEAD(&new->disks);
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INIT_LIST_HEAD(&new->all_mddevs);
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init_timer(&new->safemode_timer);
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atomic_set(&new->active, 1);
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new->queue = blk_alloc_queue(GFP_KERNEL);
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if (!new->queue) {
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kfree(new);
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return NULL;
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}
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blk_queue_make_request(new->queue, md_fail_request);
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goto retry;
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}
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static inline int mddev_lock(mddev_t * mddev)
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{
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return down_interruptible(&mddev->reconfig_sem);
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}
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static inline void mddev_lock_uninterruptible(mddev_t * mddev)
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{
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down(&mddev->reconfig_sem);
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}
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static inline int mddev_trylock(mddev_t * mddev)
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{
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return down_trylock(&mddev->reconfig_sem);
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}
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static inline void mddev_unlock(mddev_t * mddev)
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{
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up(&mddev->reconfig_sem);
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if (mddev->thread)
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md_wakeup_thread(mddev->thread);
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}
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mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
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{
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mdk_rdev_t * rdev;
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struct list_head *tmp;
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ITERATE_RDEV(mddev,rdev,tmp) {
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if (rdev->desc_nr == nr)
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return rdev;
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}
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return NULL;
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}
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static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
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{
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struct list_head *tmp;
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mdk_rdev_t *rdev;
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ITERATE_RDEV(mddev,rdev,tmp) {
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if (rdev->bdev->bd_dev == dev)
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return rdev;
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}
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return NULL;
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}
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inline static sector_t calc_dev_sboffset(struct block_device *bdev)
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{
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sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
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return MD_NEW_SIZE_BLOCKS(size);
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}
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static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
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{
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sector_t size;
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size = rdev->sb_offset;
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if (chunk_size)
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size &= ~((sector_t)chunk_size/1024 - 1);
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return size;
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}
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static int alloc_disk_sb(mdk_rdev_t * rdev)
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{
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if (rdev->sb_page)
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MD_BUG();
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rdev->sb_page = alloc_page(GFP_KERNEL);
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if (!rdev->sb_page) {
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printk(KERN_ALERT "md: out of memory.\n");
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return -EINVAL;
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}
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return 0;
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}
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static void free_disk_sb(mdk_rdev_t * rdev)
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{
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if (rdev->sb_page) {
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page_cache_release(rdev->sb_page);
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rdev->sb_loaded = 0;
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rdev->sb_page = NULL;
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rdev->sb_offset = 0;
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rdev->size = 0;
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}
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}
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static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
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{
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if (bio->bi_size)
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return 1;
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complete((struct completion*)bio->bi_private);
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return 0;
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}
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static int sync_page_io(struct block_device *bdev, sector_t sector, int size,
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struct page *page, int rw)
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{
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struct bio *bio = bio_alloc(GFP_NOIO, 1);
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struct completion event;
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int ret;
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rw |= (1 << BIO_RW_SYNC);
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bio->bi_bdev = bdev;
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bio->bi_sector = sector;
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bio_add_page(bio, page, size, 0);
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init_completion(&event);
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bio->bi_private = &event;
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bio->bi_end_io = bi_complete;
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submit_bio(rw, bio);
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wait_for_completion(&event);
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ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
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bio_put(bio);
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return ret;
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}
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static int read_disk_sb(mdk_rdev_t * rdev)
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{
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char b[BDEVNAME_SIZE];
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if (!rdev->sb_page) {
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MD_BUG();
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return -EINVAL;
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}
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if (rdev->sb_loaded)
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return 0;
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if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, MD_SB_BYTES, rdev->sb_page, READ))
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goto fail;
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rdev->sb_loaded = 1;
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return 0;
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fail:
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printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
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bdevname(rdev->bdev,b));
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return -EINVAL;
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}
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static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
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{
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if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
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(sb1->set_uuid1 == sb2->set_uuid1) &&
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(sb1->set_uuid2 == sb2->set_uuid2) &&
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(sb1->set_uuid3 == sb2->set_uuid3))
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return 1;
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return 0;
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}
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static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
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{
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int ret;
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mdp_super_t *tmp1, *tmp2;
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tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
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tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
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if (!tmp1 || !tmp2) {
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ret = 0;
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printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
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goto abort;
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}
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*tmp1 = *sb1;
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*tmp2 = *sb2;
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/*
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* nr_disks is not constant
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*/
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tmp1->nr_disks = 0;
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tmp2->nr_disks = 0;
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if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
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ret = 0;
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else
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ret = 1;
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abort:
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if (tmp1)
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kfree(tmp1);
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if (tmp2)
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kfree(tmp2);
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return ret;
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}
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static unsigned int calc_sb_csum(mdp_super_t * sb)
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{
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unsigned int disk_csum, csum;
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disk_csum = sb->sb_csum;
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sb->sb_csum = 0;
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csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
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sb->sb_csum = disk_csum;
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return csum;
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}
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|
|
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/*
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* Handle superblock details.
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* We want to be able to handle multiple superblock formats
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* so we have a common interface to them all, and an array of
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* different handlers.
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* We rely on user-space to write the initial superblock, and support
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* reading and updating of superblocks.
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* Interface methods are:
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* int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
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* loads and validates a superblock on dev.
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* if refdev != NULL, compare superblocks on both devices
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* Return:
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* 0 - dev has a superblock that is compatible with refdev
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* 1 - dev has a superblock that is compatible and newer than refdev
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* so dev should be used as the refdev in future
|
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* -EINVAL superblock incompatible or invalid
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* -othererror e.g. -EIO
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*
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* int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
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* Verify that dev is acceptable into mddev.
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* The first time, mddev->raid_disks will be 0, and data from
|
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* dev should be merged in. Subsequent calls check that dev
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* is new enough. Return 0 or -EINVAL
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*
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* void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
|
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* Update the superblock for rdev with data in mddev
|
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* This does not write to disc.
|
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*
|
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*/
|
|
|
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struct super_type {
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char *name;
|
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struct module *owner;
|
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int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
|
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int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
|
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void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
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};
|
|
|
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/*
|
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* load_super for 0.90.0
|
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*/
|
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static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
|
|
{
|
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char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
|
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mdp_super_t *sb;
|
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int ret;
|
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sector_t sb_offset;
|
|
|
|
/*
|
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* Calculate the position of the superblock,
|
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* it's at the end of the disk.
|
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*
|
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* It also happens to be a multiple of 4Kb.
|
|
*/
|
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sb_offset = calc_dev_sboffset(rdev->bdev);
|
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rdev->sb_offset = sb_offset;
|
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|
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ret = read_disk_sb(rdev);
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if (ret) return ret;
|
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|
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ret = -EINVAL;
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bdevname(rdev->bdev, b);
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sb = (mdp_super_t*)page_address(rdev->sb_page);
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|
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if (sb->md_magic != MD_SB_MAGIC) {
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|
printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
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|
b);
|
|
goto abort;
|
|
}
|
|
|
|
if (sb->major_version != 0 ||
|
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sb->minor_version != 90) {
|
|
printk(KERN_WARNING "Bad version number %d.%d on %s\n",
|
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sb->major_version, sb->minor_version,
|
|
b);
|
|
goto abort;
|
|
}
|
|
|
|
if (sb->raid_disks <= 0)
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goto abort;
|
|
|
|
if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
|
|
printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
|
|
b);
|
|
goto abort;
|
|
}
|
|
|
|
rdev->preferred_minor = sb->md_minor;
|
|
rdev->data_offset = 0;
|
|
|
|
if (sb->level == LEVEL_MULTIPATH)
|
|
rdev->desc_nr = -1;
|
|
else
|
|
rdev->desc_nr = sb->this_disk.number;
|
|
|
|
if (refdev == 0)
|
|
ret = 1;
|
|
else {
|
|
__u64 ev1, ev2;
|
|
mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
|
|
if (!uuid_equal(refsb, sb)) {
|
|
printk(KERN_WARNING "md: %s has different UUID to %s\n",
|
|
b, bdevname(refdev->bdev,b2));
|
|
goto abort;
|
|
}
|
|
if (!sb_equal(refsb, sb)) {
|
|
printk(KERN_WARNING "md: %s has same UUID"
|
|
" but different superblock to %s\n",
|
|
b, bdevname(refdev->bdev, b2));
|
|
goto abort;
|
|
}
|
|
ev1 = md_event(sb);
|
|
ev2 = md_event(refsb);
|
|
if (ev1 > ev2)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
}
|
|
rdev->size = calc_dev_size(rdev, sb->chunk_size);
|
|
|
|
abort:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* validate_super for 0.90.0
|
|
*/
|
|
static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
|
|
{
|
|
mdp_disk_t *desc;
|
|
mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
|
|
|
|
if (mddev->raid_disks == 0) {
|
|
mddev->major_version = 0;
|
|
mddev->minor_version = sb->minor_version;
|
|
mddev->patch_version = sb->patch_version;
|
|
mddev->persistent = ! sb->not_persistent;
|
|
mddev->chunk_size = sb->chunk_size;
|
|
mddev->ctime = sb->ctime;
|
|
mddev->utime = sb->utime;
|
|
mddev->level = sb->level;
|
|
mddev->layout = sb->layout;
|
|
mddev->raid_disks = sb->raid_disks;
|
|
mddev->size = sb->size;
|
|
mddev->events = md_event(sb);
|
|
|
|
if (sb->state & (1<<MD_SB_CLEAN))
|
|
mddev->recovery_cp = MaxSector;
|
|
else {
|
|
if (sb->events_hi == sb->cp_events_hi &&
|
|
sb->events_lo == sb->cp_events_lo) {
|
|
mddev->recovery_cp = sb->recovery_cp;
|
|
} else
|
|
mddev->recovery_cp = 0;
|
|
}
|
|
|
|
memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
|
|
memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
|
|
memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
|
|
memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
|
|
|
|
mddev->max_disks = MD_SB_DISKS;
|
|
} else {
|
|
__u64 ev1;
|
|
ev1 = md_event(sb);
|
|
++ev1;
|
|
if (ev1 < mddev->events)
|
|
return -EINVAL;
|
|
}
|
|
if (mddev->level != LEVEL_MULTIPATH) {
|
|
rdev->raid_disk = -1;
|
|
rdev->in_sync = rdev->faulty = 0;
|
|
desc = sb->disks + rdev->desc_nr;
|
|
|
|
if (desc->state & (1<<MD_DISK_FAULTY))
|
|
rdev->faulty = 1;
|
|
else if (desc->state & (1<<MD_DISK_SYNC) &&
|
|
desc->raid_disk < mddev->raid_disks) {
|
|
rdev->in_sync = 1;
|
|
rdev->raid_disk = desc->raid_disk;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* sync_super for 0.90.0
|
|
*/
|
|
static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
|
|
{
|
|
mdp_super_t *sb;
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev2;
|
|
int next_spare = mddev->raid_disks;
|
|
|
|
/* make rdev->sb match mddev data..
|
|
*
|
|
* 1/ zero out disks
|
|
* 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
|
|
* 3/ any empty disks < next_spare become removed
|
|
*
|
|
* disks[0] gets initialised to REMOVED because
|
|
* we cannot be sure from other fields if it has
|
|
* been initialised or not.
|
|
*/
|
|
int i;
|
|
int active=0, working=0,failed=0,spare=0,nr_disks=0;
|
|
|
|
sb = (mdp_super_t*)page_address(rdev->sb_page);
|
|
|
|
memset(sb, 0, sizeof(*sb));
|
|
|
|
sb->md_magic = MD_SB_MAGIC;
|
|
sb->major_version = mddev->major_version;
|
|
sb->minor_version = mddev->minor_version;
|
|
sb->patch_version = mddev->patch_version;
|
|
sb->gvalid_words = 0; /* ignored */
|
|
memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
|
|
memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
|
|
memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
|
|
memcpy(&sb->set_uuid3, mddev->uuid+12,4);
|
|
|
|
sb->ctime = mddev->ctime;
|
|
sb->level = mddev->level;
|
|
sb->size = mddev->size;
|
|
sb->raid_disks = mddev->raid_disks;
|
|
sb->md_minor = mddev->md_minor;
|
|
sb->not_persistent = !mddev->persistent;
|
|
sb->utime = mddev->utime;
|
|
sb->state = 0;
|
|
sb->events_hi = (mddev->events>>32);
|
|
sb->events_lo = (u32)mddev->events;
|
|
|
|
if (mddev->in_sync)
|
|
{
|
|
sb->recovery_cp = mddev->recovery_cp;
|
|
sb->cp_events_hi = (mddev->events>>32);
|
|
sb->cp_events_lo = (u32)mddev->events;
|
|
if (mddev->recovery_cp == MaxSector)
|
|
sb->state = (1<< MD_SB_CLEAN);
|
|
} else
|
|
sb->recovery_cp = 0;
|
|
|
|
sb->layout = mddev->layout;
|
|
sb->chunk_size = mddev->chunk_size;
|
|
|
|
sb->disks[0].state = (1<<MD_DISK_REMOVED);
|
|
ITERATE_RDEV(mddev,rdev2,tmp) {
|
|
mdp_disk_t *d;
|
|
if (rdev2->raid_disk >= 0 && rdev2->in_sync && !rdev2->faulty)
|
|
rdev2->desc_nr = rdev2->raid_disk;
|
|
else
|
|
rdev2->desc_nr = next_spare++;
|
|
d = &sb->disks[rdev2->desc_nr];
|
|
nr_disks++;
|
|
d->number = rdev2->desc_nr;
|
|
d->major = MAJOR(rdev2->bdev->bd_dev);
|
|
d->minor = MINOR(rdev2->bdev->bd_dev);
|
|
if (rdev2->raid_disk >= 0 && rdev->in_sync && !rdev2->faulty)
|
|
d->raid_disk = rdev2->raid_disk;
|
|
else
|
|
d->raid_disk = rdev2->desc_nr; /* compatibility */
|
|
if (rdev2->faulty) {
|
|
d->state = (1<<MD_DISK_FAULTY);
|
|
failed++;
|
|
} else if (rdev2->in_sync) {
|
|
d->state = (1<<MD_DISK_ACTIVE);
|
|
d->state |= (1<<MD_DISK_SYNC);
|
|
active++;
|
|
working++;
|
|
} else {
|
|
d->state = 0;
|
|
spare++;
|
|
working++;
|
|
}
|
|
}
|
|
|
|
/* now set the "removed" and "faulty" bits on any missing devices */
|
|
for (i=0 ; i < mddev->raid_disks ; i++) {
|
|
mdp_disk_t *d = &sb->disks[i];
|
|
if (d->state == 0 && d->number == 0) {
|
|
d->number = i;
|
|
d->raid_disk = i;
|
|
d->state = (1<<MD_DISK_REMOVED);
|
|
d->state |= (1<<MD_DISK_FAULTY);
|
|
failed++;
|
|
}
|
|
}
|
|
sb->nr_disks = nr_disks;
|
|
sb->active_disks = active;
|
|
sb->working_disks = working;
|
|
sb->failed_disks = failed;
|
|
sb->spare_disks = spare;
|
|
|
|
sb->this_disk = sb->disks[rdev->desc_nr];
|
|
sb->sb_csum = calc_sb_csum(sb);
|
|
}
|
|
|
|
/*
|
|
* version 1 superblock
|
|
*/
|
|
|
|
static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
|
|
{
|
|
unsigned int disk_csum, csum;
|
|
unsigned long long newcsum;
|
|
int size = 256 + le32_to_cpu(sb->max_dev)*2;
|
|
unsigned int *isuper = (unsigned int*)sb;
|
|
int i;
|
|
|
|
disk_csum = sb->sb_csum;
|
|
sb->sb_csum = 0;
|
|
newcsum = 0;
|
|
for (i=0; size>=4; size -= 4 )
|
|
newcsum += le32_to_cpu(*isuper++);
|
|
|
|
if (size == 2)
|
|
newcsum += le16_to_cpu(*(unsigned short*) isuper);
|
|
|
|
csum = (newcsum & 0xffffffff) + (newcsum >> 32);
|
|
sb->sb_csum = disk_csum;
|
|
return cpu_to_le32(csum);
|
|
}
|
|
|
|
static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
|
|
{
|
|
struct mdp_superblock_1 *sb;
|
|
int ret;
|
|
sector_t sb_offset;
|
|
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
|
|
|
|
/*
|
|
* Calculate the position of the superblock.
|
|
* It is always aligned to a 4K boundary and
|
|
* depeding on minor_version, it can be:
|
|
* 0: At least 8K, but less than 12K, from end of device
|
|
* 1: At start of device
|
|
* 2: 4K from start of device.
|
|
*/
|
|
switch(minor_version) {
|
|
case 0:
|
|
sb_offset = rdev->bdev->bd_inode->i_size >> 9;
|
|
sb_offset -= 8*2;
|
|
sb_offset &= ~(4*2-1);
|
|
/* convert from sectors to K */
|
|
sb_offset /= 2;
|
|
break;
|
|
case 1:
|
|
sb_offset = 0;
|
|
break;
|
|
case 2:
|
|
sb_offset = 4;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
rdev->sb_offset = sb_offset;
|
|
|
|
ret = read_disk_sb(rdev);
|
|
if (ret) return ret;
|
|
|
|
|
|
sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
|
|
|
|
if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
|
|
sb->major_version != cpu_to_le32(1) ||
|
|
le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
|
|
le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
|
|
sb->feature_map != 0)
|
|
return -EINVAL;
|
|
|
|
if (calc_sb_1_csum(sb) != sb->sb_csum) {
|
|
printk("md: invalid superblock checksum on %s\n",
|
|
bdevname(rdev->bdev,b));
|
|
return -EINVAL;
|
|
}
|
|
if (le64_to_cpu(sb->data_size) < 10) {
|
|
printk("md: data_size too small on %s\n",
|
|
bdevname(rdev->bdev,b));
|
|
return -EINVAL;
|
|
}
|
|
rdev->preferred_minor = 0xffff;
|
|
rdev->data_offset = le64_to_cpu(sb->data_offset);
|
|
|
|
if (refdev == 0)
|
|
return 1;
|
|
else {
|
|
__u64 ev1, ev2;
|
|
struct mdp_superblock_1 *refsb =
|
|
(struct mdp_superblock_1*)page_address(refdev->sb_page);
|
|
|
|
if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
|
|
sb->level != refsb->level ||
|
|
sb->layout != refsb->layout ||
|
|
sb->chunksize != refsb->chunksize) {
|
|
printk(KERN_WARNING "md: %s has strangely different"
|
|
" superblock to %s\n",
|
|
bdevname(rdev->bdev,b),
|
|
bdevname(refdev->bdev,b2));
|
|
return -EINVAL;
|
|
}
|
|
ev1 = le64_to_cpu(sb->events);
|
|
ev2 = le64_to_cpu(refsb->events);
|
|
|
|
if (ev1 > ev2)
|
|
return 1;
|
|
}
|
|
if (minor_version)
|
|
rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
|
|
else
|
|
rdev->size = rdev->sb_offset;
|
|
if (rdev->size < le64_to_cpu(sb->data_size)/2)
|
|
return -EINVAL;
|
|
rdev->size = le64_to_cpu(sb->data_size)/2;
|
|
if (le32_to_cpu(sb->chunksize))
|
|
rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
|
|
return 0;
|
|
}
|
|
|
|
static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
|
|
{
|
|
struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
|
|
|
|
if (mddev->raid_disks == 0) {
|
|
mddev->major_version = 1;
|
|
mddev->patch_version = 0;
|
|
mddev->persistent = 1;
|
|
mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
|
|
mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
|
|
mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
|
|
mddev->level = le32_to_cpu(sb->level);
|
|
mddev->layout = le32_to_cpu(sb->layout);
|
|
mddev->raid_disks = le32_to_cpu(sb->raid_disks);
|
|
mddev->size = le64_to_cpu(sb->size)/2;
|
|
mddev->events = le64_to_cpu(sb->events);
|
|
|
|
mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
|
|
memcpy(mddev->uuid, sb->set_uuid, 16);
|
|
|
|
mddev->max_disks = (4096-256)/2;
|
|
} else {
|
|
__u64 ev1;
|
|
ev1 = le64_to_cpu(sb->events);
|
|
++ev1;
|
|
if (ev1 < mddev->events)
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (mddev->level != LEVEL_MULTIPATH) {
|
|
int role;
|
|
rdev->desc_nr = le32_to_cpu(sb->dev_number);
|
|
role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
|
|
switch(role) {
|
|
case 0xffff: /* spare */
|
|
rdev->in_sync = 0;
|
|
rdev->faulty = 0;
|
|
rdev->raid_disk = -1;
|
|
break;
|
|
case 0xfffe: /* faulty */
|
|
rdev->in_sync = 0;
|
|
rdev->faulty = 1;
|
|
rdev->raid_disk = -1;
|
|
break;
|
|
default:
|
|
rdev->in_sync = 1;
|
|
rdev->faulty = 0;
|
|
rdev->raid_disk = role;
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
|
|
{
|
|
struct mdp_superblock_1 *sb;
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev2;
|
|
int max_dev, i;
|
|
/* make rdev->sb match mddev and rdev data. */
|
|
|
|
sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
|
|
|
|
sb->feature_map = 0;
|
|
sb->pad0 = 0;
|
|
memset(sb->pad1, 0, sizeof(sb->pad1));
|
|
memset(sb->pad2, 0, sizeof(sb->pad2));
|
|
memset(sb->pad3, 0, sizeof(sb->pad3));
|
|
|
|
sb->utime = cpu_to_le64((__u64)mddev->utime);
|
|
sb->events = cpu_to_le64(mddev->events);
|
|
if (mddev->in_sync)
|
|
sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
|
|
else
|
|
sb->resync_offset = cpu_to_le64(0);
|
|
|
|
max_dev = 0;
|
|
ITERATE_RDEV(mddev,rdev2,tmp)
|
|
if (rdev2->desc_nr+1 > max_dev)
|
|
max_dev = rdev2->desc_nr+1;
|
|
|
|
sb->max_dev = cpu_to_le32(max_dev);
|
|
for (i=0; i<max_dev;i++)
|
|
sb->dev_roles[i] = cpu_to_le16(0xfffe);
|
|
|
|
ITERATE_RDEV(mddev,rdev2,tmp) {
|
|
i = rdev2->desc_nr;
|
|
if (rdev2->faulty)
|
|
sb->dev_roles[i] = cpu_to_le16(0xfffe);
|
|
else if (rdev2->in_sync)
|
|
sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
|
|
else
|
|
sb->dev_roles[i] = cpu_to_le16(0xffff);
|
|
}
|
|
|
|
sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
|
|
sb->sb_csum = calc_sb_1_csum(sb);
|
|
}
|
|
|
|
|
|
struct super_type super_types[] = {
|
|
[0] = {
|
|
.name = "0.90.0",
|
|
.owner = THIS_MODULE,
|
|
.load_super = super_90_load,
|
|
.validate_super = super_90_validate,
|
|
.sync_super = super_90_sync,
|
|
},
|
|
[1] = {
|
|
.name = "md-1",
|
|
.owner = THIS_MODULE,
|
|
.load_super = super_1_load,
|
|
.validate_super = super_1_validate,
|
|
.sync_super = super_1_sync,
|
|
},
|
|
};
|
|
|
|
static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
|
|
{
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev;
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp)
|
|
if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
|
|
return rdev;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
|
|
{
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev;
|
|
|
|
ITERATE_RDEV(mddev1,rdev,tmp)
|
|
if (match_dev_unit(mddev2, rdev))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static LIST_HEAD(pending_raid_disks);
|
|
|
|
static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
|
|
{
|
|
mdk_rdev_t *same_pdev;
|
|
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
|
|
|
|
if (rdev->mddev) {
|
|
MD_BUG();
|
|
return -EINVAL;
|
|
}
|
|
same_pdev = match_dev_unit(mddev, rdev);
|
|
if (same_pdev)
|
|
printk(KERN_WARNING
|
|
"%s: WARNING: %s appears to be on the same physical"
|
|
" disk as %s. True\n protection against single-disk"
|
|
" failure might be compromised.\n",
|
|
mdname(mddev), bdevname(rdev->bdev,b),
|
|
bdevname(same_pdev->bdev,b2));
|
|
|
|
/* Verify rdev->desc_nr is unique.
|
|
* If it is -1, assign a free number, else
|
|
* check number is not in use
|
|
*/
|
|
if (rdev->desc_nr < 0) {
|
|
int choice = 0;
|
|
if (mddev->pers) choice = mddev->raid_disks;
|
|
while (find_rdev_nr(mddev, choice))
|
|
choice++;
|
|
rdev->desc_nr = choice;
|
|
} else {
|
|
if (find_rdev_nr(mddev, rdev->desc_nr))
|
|
return -EBUSY;
|
|
}
|
|
|
|
list_add(&rdev->same_set, &mddev->disks);
|
|
rdev->mddev = mddev;
|
|
printk(KERN_INFO "md: bind<%s>\n", bdevname(rdev->bdev,b));
|
|
return 0;
|
|
}
|
|
|
|
static void unbind_rdev_from_array(mdk_rdev_t * rdev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
if (!rdev->mddev) {
|
|
MD_BUG();
|
|
return;
|
|
}
|
|
list_del_init(&rdev->same_set);
|
|
printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
|
|
rdev->mddev = NULL;
|
|
}
|
|
|
|
/*
|
|
* prevent the device from being mounted, repartitioned or
|
|
* otherwise reused by a RAID array (or any other kernel
|
|
* subsystem), by bd_claiming the device.
|
|
*/
|
|
static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
|
|
{
|
|
int err = 0;
|
|
struct block_device *bdev;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
|
|
if (IS_ERR(bdev)) {
|
|
printk(KERN_ERR "md: could not open %s.\n",
|
|
__bdevname(dev, b));
|
|
return PTR_ERR(bdev);
|
|
}
|
|
err = bd_claim(bdev, rdev);
|
|
if (err) {
|
|
printk(KERN_ERR "md: could not bd_claim %s.\n",
|
|
bdevname(bdev, b));
|
|
blkdev_put(bdev);
|
|
return err;
|
|
}
|
|
rdev->bdev = bdev;
|
|
return err;
|
|
}
|
|
|
|
static void unlock_rdev(mdk_rdev_t *rdev)
|
|
{
|
|
struct block_device *bdev = rdev->bdev;
|
|
rdev->bdev = NULL;
|
|
if (!bdev)
|
|
MD_BUG();
|
|
bd_release(bdev);
|
|
blkdev_put(bdev);
|
|
}
|
|
|
|
void md_autodetect_dev(dev_t dev);
|
|
|
|
static void export_rdev(mdk_rdev_t * rdev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
printk(KERN_INFO "md: export_rdev(%s)\n",
|
|
bdevname(rdev->bdev,b));
|
|
if (rdev->mddev)
|
|
MD_BUG();
|
|
free_disk_sb(rdev);
|
|
list_del_init(&rdev->same_set);
|
|
#ifndef MODULE
|
|
md_autodetect_dev(rdev->bdev->bd_dev);
|
|
#endif
|
|
unlock_rdev(rdev);
|
|
kfree(rdev);
|
|
}
|
|
|
|
static void kick_rdev_from_array(mdk_rdev_t * rdev)
|
|
{
|
|
unbind_rdev_from_array(rdev);
|
|
export_rdev(rdev);
|
|
}
|
|
|
|
static void export_array(mddev_t *mddev)
|
|
{
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev;
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
if (!rdev->mddev) {
|
|
MD_BUG();
|
|
continue;
|
|
}
|
|
kick_rdev_from_array(rdev);
|
|
}
|
|
if (!list_empty(&mddev->disks))
|
|
MD_BUG();
|
|
mddev->raid_disks = 0;
|
|
mddev->major_version = 0;
|
|
}
|
|
|
|
static void print_desc(mdp_disk_t *desc)
|
|
{
|
|
printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
|
|
desc->major,desc->minor,desc->raid_disk,desc->state);
|
|
}
|
|
|
|
static void print_sb(mdp_super_t *sb)
|
|
{
|
|
int i;
|
|
|
|
printk(KERN_INFO
|
|
"md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
|
|
sb->major_version, sb->minor_version, sb->patch_version,
|
|
sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
|
|
sb->ctime);
|
|
printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
|
|
sb->level, sb->size, sb->nr_disks, sb->raid_disks,
|
|
sb->md_minor, sb->layout, sb->chunk_size);
|
|
printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
|
|
" FD:%d SD:%d CSUM:%08x E:%08lx\n",
|
|
sb->utime, sb->state, sb->active_disks, sb->working_disks,
|
|
sb->failed_disks, sb->spare_disks,
|
|
sb->sb_csum, (unsigned long)sb->events_lo);
|
|
|
|
printk(KERN_INFO);
|
|
for (i = 0; i < MD_SB_DISKS; i++) {
|
|
mdp_disk_t *desc;
|
|
|
|
desc = sb->disks + i;
|
|
if (desc->number || desc->major || desc->minor ||
|
|
desc->raid_disk || (desc->state && (desc->state != 4))) {
|
|
printk(" D %2d: ", i);
|
|
print_desc(desc);
|
|
}
|
|
}
|
|
printk(KERN_INFO "md: THIS: ");
|
|
print_desc(&sb->this_disk);
|
|
|
|
}
|
|
|
|
static void print_rdev(mdk_rdev_t *rdev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
|
|
bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
|
|
rdev->faulty, rdev->in_sync, rdev->desc_nr);
|
|
if (rdev->sb_loaded) {
|
|
printk(KERN_INFO "md: rdev superblock:\n");
|
|
print_sb((mdp_super_t*)page_address(rdev->sb_page));
|
|
} else
|
|
printk(KERN_INFO "md: no rdev superblock!\n");
|
|
}
|
|
|
|
void md_print_devices(void)
|
|
{
|
|
struct list_head *tmp, *tmp2;
|
|
mdk_rdev_t *rdev;
|
|
mddev_t *mddev;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
printk("\n");
|
|
printk("md: **********************************\n");
|
|
printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
|
|
printk("md: **********************************\n");
|
|
ITERATE_MDDEV(mddev,tmp) {
|
|
printk("%s: ", mdname(mddev));
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp2)
|
|
printk("<%s>", bdevname(rdev->bdev,b));
|
|
printk("\n");
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp2)
|
|
print_rdev(rdev);
|
|
}
|
|
printk("md: **********************************\n");
|
|
printk("\n");
|
|
}
|
|
|
|
|
|
static int write_disk_sb(mdk_rdev_t * rdev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
if (!rdev->sb_loaded) {
|
|
MD_BUG();
|
|
return 1;
|
|
}
|
|
if (rdev->faulty) {
|
|
MD_BUG();
|
|
return 1;
|
|
}
|
|
|
|
dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
|
|
bdevname(rdev->bdev,b),
|
|
(unsigned long long)rdev->sb_offset);
|
|
|
|
if (sync_page_io(rdev->bdev, rdev->sb_offset<<1, MD_SB_BYTES, rdev->sb_page, WRITE))
|
|
return 0;
|
|
|
|
printk("md: write_disk_sb failed for device %s\n",
|
|
bdevname(rdev->bdev,b));
|
|
return 1;
|
|
}
|
|
|
|
static void sync_sbs(mddev_t * mddev)
|
|
{
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *tmp;
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
super_types[mddev->major_version].
|
|
sync_super(mddev, rdev);
|
|
rdev->sb_loaded = 1;
|
|
}
|
|
}
|
|
|
|
static void md_update_sb(mddev_t * mddev)
|
|
{
|
|
int err, count = 100;
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev;
|
|
|
|
mddev->sb_dirty = 0;
|
|
repeat:
|
|
mddev->utime = get_seconds();
|
|
mddev->events ++;
|
|
|
|
if (!mddev->events) {
|
|
/*
|
|
* oops, this 64-bit counter should never wrap.
|
|
* Either we are in around ~1 trillion A.C., assuming
|
|
* 1 reboot per second, or we have a bug:
|
|
*/
|
|
MD_BUG();
|
|
mddev->events --;
|
|
}
|
|
sync_sbs(mddev);
|
|
|
|
/*
|
|
* do not write anything to disk if using
|
|
* nonpersistent superblocks
|
|
*/
|
|
if (!mddev->persistent)
|
|
return;
|
|
|
|
dprintk(KERN_INFO
|
|
"md: updating %s RAID superblock on device (in sync %d)\n",
|
|
mdname(mddev),mddev->in_sync);
|
|
|
|
err = 0;
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
char b[BDEVNAME_SIZE];
|
|
dprintk(KERN_INFO "md: ");
|
|
if (rdev->faulty)
|
|
dprintk("(skipping faulty ");
|
|
|
|
dprintk("%s ", bdevname(rdev->bdev,b));
|
|
if (!rdev->faulty) {
|
|
err += write_disk_sb(rdev);
|
|
} else
|
|
dprintk(")\n");
|
|
if (!err && mddev->level == LEVEL_MULTIPATH)
|
|
/* only need to write one superblock... */
|
|
break;
|
|
}
|
|
if (err) {
|
|
if (--count) {
|
|
printk(KERN_ERR "md: errors occurred during superblock"
|
|
" update, repeating\n");
|
|
goto repeat;
|
|
}
|
|
printk(KERN_ERR \
|
|
"md: excessive errors occurred during superblock update, exiting\n");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Import a device. If 'super_format' >= 0, then sanity check the superblock
|
|
*
|
|
* mark the device faulty if:
|
|
*
|
|
* - the device is nonexistent (zero size)
|
|
* - the device has no valid superblock
|
|
*
|
|
* a faulty rdev _never_ has rdev->sb set.
|
|
*/
|
|
static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
int err;
|
|
mdk_rdev_t *rdev;
|
|
sector_t size;
|
|
|
|
rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL);
|
|
if (!rdev) {
|
|
printk(KERN_ERR "md: could not alloc mem for new device!\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
memset(rdev, 0, sizeof(*rdev));
|
|
|
|
if ((err = alloc_disk_sb(rdev)))
|
|
goto abort_free;
|
|
|
|
err = lock_rdev(rdev, newdev);
|
|
if (err)
|
|
goto abort_free;
|
|
|
|
rdev->desc_nr = -1;
|
|
rdev->faulty = 0;
|
|
rdev->in_sync = 0;
|
|
rdev->data_offset = 0;
|
|
atomic_set(&rdev->nr_pending, 0);
|
|
|
|
size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
|
|
if (!size) {
|
|
printk(KERN_WARNING
|
|
"md: %s has zero or unknown size, marking faulty!\n",
|
|
bdevname(rdev->bdev,b));
|
|
err = -EINVAL;
|
|
goto abort_free;
|
|
}
|
|
|
|
if (super_format >= 0) {
|
|
err = super_types[super_format].
|
|
load_super(rdev, NULL, super_minor);
|
|
if (err == -EINVAL) {
|
|
printk(KERN_WARNING
|
|
"md: %s has invalid sb, not importing!\n",
|
|
bdevname(rdev->bdev,b));
|
|
goto abort_free;
|
|
}
|
|
if (err < 0) {
|
|
printk(KERN_WARNING
|
|
"md: could not read %s's sb, not importing!\n",
|
|
bdevname(rdev->bdev,b));
|
|
goto abort_free;
|
|
}
|
|
}
|
|
INIT_LIST_HEAD(&rdev->same_set);
|
|
|
|
return rdev;
|
|
|
|
abort_free:
|
|
if (rdev->sb_page) {
|
|
if (rdev->bdev)
|
|
unlock_rdev(rdev);
|
|
free_disk_sb(rdev);
|
|
}
|
|
kfree(rdev);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/*
|
|
* Check a full RAID array for plausibility
|
|
*/
|
|
|
|
|
|
static void analyze_sbs(mddev_t * mddev)
|
|
{
|
|
int i;
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev, *freshest;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
freshest = NULL;
|
|
ITERATE_RDEV(mddev,rdev,tmp)
|
|
switch (super_types[mddev->major_version].
|
|
load_super(rdev, freshest, mddev->minor_version)) {
|
|
case 1:
|
|
freshest = rdev;
|
|
break;
|
|
case 0:
|
|
break;
|
|
default:
|
|
printk( KERN_ERR \
|
|
"md: fatal superblock inconsistency in %s"
|
|
" -- removing from array\n",
|
|
bdevname(rdev->bdev,b));
|
|
kick_rdev_from_array(rdev);
|
|
}
|
|
|
|
|
|
super_types[mddev->major_version].
|
|
validate_super(mddev, freshest);
|
|
|
|
i = 0;
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
if (rdev != freshest)
|
|
if (super_types[mddev->major_version].
|
|
validate_super(mddev, rdev)) {
|
|
printk(KERN_WARNING "md: kicking non-fresh %s"
|
|
" from array!\n",
|
|
bdevname(rdev->bdev,b));
|
|
kick_rdev_from_array(rdev);
|
|
continue;
|
|
}
|
|
if (mddev->level == LEVEL_MULTIPATH) {
|
|
rdev->desc_nr = i++;
|
|
rdev->raid_disk = rdev->desc_nr;
|
|
rdev->in_sync = 1;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
if (mddev->recovery_cp != MaxSector &&
|
|
mddev->level >= 1)
|
|
printk(KERN_ERR "md: %s: raid array is not clean"
|
|
" -- starting background reconstruction\n",
|
|
mdname(mddev));
|
|
|
|
}
|
|
|
|
int mdp_major = 0;
|
|
|
|
static struct kobject *md_probe(dev_t dev, int *part, void *data)
|
|
{
|
|
static DECLARE_MUTEX(disks_sem);
|
|
mddev_t *mddev = mddev_find(dev);
|
|
struct gendisk *disk;
|
|
int partitioned = (MAJOR(dev) != MD_MAJOR);
|
|
int shift = partitioned ? MdpMinorShift : 0;
|
|
int unit = MINOR(dev) >> shift;
|
|
|
|
if (!mddev)
|
|
return NULL;
|
|
|
|
down(&disks_sem);
|
|
if (mddev->gendisk) {
|
|
up(&disks_sem);
|
|
mddev_put(mddev);
|
|
return NULL;
|
|
}
|
|
disk = alloc_disk(1 << shift);
|
|
if (!disk) {
|
|
up(&disks_sem);
|
|
mddev_put(mddev);
|
|
return NULL;
|
|
}
|
|
disk->major = MAJOR(dev);
|
|
disk->first_minor = unit << shift;
|
|
if (partitioned) {
|
|
sprintf(disk->disk_name, "md_d%d", unit);
|
|
sprintf(disk->devfs_name, "md/d%d", unit);
|
|
} else {
|
|
sprintf(disk->disk_name, "md%d", unit);
|
|
sprintf(disk->devfs_name, "md/%d", unit);
|
|
}
|
|
disk->fops = &md_fops;
|
|
disk->private_data = mddev;
|
|
disk->queue = mddev->queue;
|
|
add_disk(disk);
|
|
mddev->gendisk = disk;
|
|
up(&disks_sem);
|
|
return NULL;
|
|
}
|
|
|
|
void md_wakeup_thread(mdk_thread_t *thread);
|
|
|
|
static void md_safemode_timeout(unsigned long data)
|
|
{
|
|
mddev_t *mddev = (mddev_t *) data;
|
|
|
|
mddev->safemode = 1;
|
|
md_wakeup_thread(mddev->thread);
|
|
}
|
|
|
|
|
|
static int do_md_run(mddev_t * mddev)
|
|
{
|
|
int pnum, err;
|
|
int chunk_size;
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev;
|
|
struct gendisk *disk;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
if (list_empty(&mddev->disks))
|
|
/* cannot run an array with no devices.. */
|
|
return -EINVAL;
|
|
|
|
if (mddev->pers)
|
|
return -EBUSY;
|
|
|
|
/*
|
|
* Analyze all RAID superblock(s)
|
|
*/
|
|
if (!mddev->raid_disks)
|
|
analyze_sbs(mddev);
|
|
|
|
chunk_size = mddev->chunk_size;
|
|
pnum = level_to_pers(mddev->level);
|
|
|
|
if ((pnum != MULTIPATH) && (pnum != RAID1)) {
|
|
if (!chunk_size) {
|
|
/*
|
|
* 'default chunksize' in the old md code used to
|
|
* be PAGE_SIZE, baaad.
|
|
* we abort here to be on the safe side. We don't
|
|
* want to continue the bad practice.
|
|
*/
|
|
printk(KERN_ERR
|
|
"no chunksize specified, see 'man raidtab'\n");
|
|
return -EINVAL;
|
|
}
|
|
if (chunk_size > MAX_CHUNK_SIZE) {
|
|
printk(KERN_ERR "too big chunk_size: %d > %d\n",
|
|
chunk_size, MAX_CHUNK_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* chunk-size has to be a power of 2 and multiples of PAGE_SIZE
|
|
*/
|
|
if ( (1 << ffz(~chunk_size)) != chunk_size) {
|
|
printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
|
|
return -EINVAL;
|
|
}
|
|
if (chunk_size < PAGE_SIZE) {
|
|
printk(KERN_ERR "too small chunk_size: %d < %ld\n",
|
|
chunk_size, PAGE_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* devices must have minimum size of one chunk */
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
if (rdev->faulty)
|
|
continue;
|
|
if (rdev->size < chunk_size / 1024) {
|
|
printk(KERN_WARNING
|
|
"md: Dev %s smaller than chunk_size:"
|
|
" %lluk < %dk\n",
|
|
bdevname(rdev->bdev,b),
|
|
(unsigned long long)rdev->size,
|
|
chunk_size / 1024);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_KMOD
|
|
if (!pers[pnum])
|
|
{
|
|
request_module("md-personality-%d", pnum);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Drop all container device buffers, from now on
|
|
* the only valid external interface is through the md
|
|
* device.
|
|
* Also find largest hardsector size
|
|
*/
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
if (rdev->faulty)
|
|
continue;
|
|
sync_blockdev(rdev->bdev);
|
|
invalidate_bdev(rdev->bdev, 0);
|
|
}
|
|
|
|
md_probe(mddev->unit, NULL, NULL);
|
|
disk = mddev->gendisk;
|
|
if (!disk)
|
|
return -ENOMEM;
|
|
|
|
spin_lock(&pers_lock);
|
|
if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) {
|
|
spin_unlock(&pers_lock);
|
|
printk(KERN_WARNING "md: personality %d is not loaded!\n",
|
|
pnum);
|
|
return -EINVAL;
|
|
}
|
|
|
|
mddev->pers = pers[pnum];
|
|
spin_unlock(&pers_lock);
|
|
|
|
mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
|
|
|
|
err = mddev->pers->run(mddev);
|
|
if (err) {
|
|
printk(KERN_ERR "md: pers->run() failed ...\n");
|
|
module_put(mddev->pers->owner);
|
|
mddev->pers = NULL;
|
|
return -EINVAL;
|
|
}
|
|
atomic_set(&mddev->writes_pending,0);
|
|
mddev->safemode = 0;
|
|
mddev->safemode_timer.function = md_safemode_timeout;
|
|
mddev->safemode_timer.data = (unsigned long) mddev;
|
|
mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
|
|
mddev->in_sync = 1;
|
|
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
|
|
if (mddev->sb_dirty)
|
|
md_update_sb(mddev);
|
|
|
|
set_capacity(disk, mddev->array_size<<1);
|
|
|
|
/* If we call blk_queue_make_request here, it will
|
|
* re-initialise max_sectors etc which may have been
|
|
* refined inside -> run. So just set the bits we need to set.
|
|
* Most initialisation happended when we called
|
|
* blk_queue_make_request(..., md_fail_request)
|
|
* earlier.
|
|
*/
|
|
mddev->queue->queuedata = mddev;
|
|
mddev->queue->make_request_fn = mddev->pers->make_request;
|
|
|
|
mddev->changed = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int restart_array(mddev_t *mddev)
|
|
{
|
|
struct gendisk *disk = mddev->gendisk;
|
|
int err;
|
|
|
|
/*
|
|
* Complain if it has no devices
|
|
*/
|
|
err = -ENXIO;
|
|
if (list_empty(&mddev->disks))
|
|
goto out;
|
|
|
|
if (mddev->pers) {
|
|
err = -EBUSY;
|
|
if (!mddev->ro)
|
|
goto out;
|
|
|
|
mddev->safemode = 0;
|
|
mddev->ro = 0;
|
|
set_disk_ro(disk, 0);
|
|
|
|
printk(KERN_INFO "md: %s switched to read-write mode.\n",
|
|
mdname(mddev));
|
|
/*
|
|
* Kick recovery or resync if necessary
|
|
*/
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
err = 0;
|
|
} else {
|
|
printk(KERN_ERR "md: %s has no personality assigned.\n",
|
|
mdname(mddev));
|
|
err = -EINVAL;
|
|
}
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int do_md_stop(mddev_t * mddev, int ro)
|
|
{
|
|
int err = 0;
|
|
struct gendisk *disk = mddev->gendisk;
|
|
|
|
if (mddev->pers) {
|
|
if (atomic_read(&mddev->active)>2) {
|
|
printk("md: %s still in use.\n",mdname(mddev));
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (mddev->sync_thread) {
|
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
|
|
md_unregister_thread(mddev->sync_thread);
|
|
mddev->sync_thread = NULL;
|
|
}
|
|
|
|
del_timer_sync(&mddev->safemode_timer);
|
|
|
|
invalidate_partition(disk, 0);
|
|
|
|
if (ro) {
|
|
err = -ENXIO;
|
|
if (mddev->ro)
|
|
goto out;
|
|
mddev->ro = 1;
|
|
} else {
|
|
if (mddev->ro)
|
|
set_disk_ro(disk, 0);
|
|
blk_queue_make_request(mddev->queue, md_fail_request);
|
|
mddev->pers->stop(mddev);
|
|
module_put(mddev->pers->owner);
|
|
mddev->pers = NULL;
|
|
if (mddev->ro)
|
|
mddev->ro = 0;
|
|
}
|
|
if (!mddev->in_sync) {
|
|
/* mark array as shutdown cleanly */
|
|
mddev->in_sync = 1;
|
|
md_update_sb(mddev);
|
|
}
|
|
if (ro)
|
|
set_disk_ro(disk, 1);
|
|
}
|
|
/*
|
|
* Free resources if final stop
|
|
*/
|
|
if (!ro) {
|
|
struct gendisk *disk;
|
|
printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
|
|
|
|
export_array(mddev);
|
|
|
|
mddev->array_size = 0;
|
|
disk = mddev->gendisk;
|
|
if (disk)
|
|
set_capacity(disk, 0);
|
|
mddev->changed = 1;
|
|
} else
|
|
printk(KERN_INFO "md: %s switched to read-only mode.\n",
|
|
mdname(mddev));
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void autorun_array(mddev_t *mddev)
|
|
{
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *tmp;
|
|
int err;
|
|
|
|
if (list_empty(&mddev->disks))
|
|
return;
|
|
|
|
printk(KERN_INFO "md: running: ");
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
char b[BDEVNAME_SIZE];
|
|
printk("<%s>", bdevname(rdev->bdev,b));
|
|
}
|
|
printk("\n");
|
|
|
|
err = do_md_run (mddev);
|
|
if (err) {
|
|
printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
|
|
do_md_stop (mddev, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* lets try to run arrays based on all disks that have arrived
|
|
* until now. (those are in pending_raid_disks)
|
|
*
|
|
* the method: pick the first pending disk, collect all disks with
|
|
* the same UUID, remove all from the pending list and put them into
|
|
* the 'same_array' list. Then order this list based on superblock
|
|
* update time (freshest comes first), kick out 'old' disks and
|
|
* compare superblocks. If everything's fine then run it.
|
|
*
|
|
* If "unit" is allocated, then bump its reference count
|
|
*/
|
|
static void autorun_devices(int part)
|
|
{
|
|
struct list_head candidates;
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev0, *rdev;
|
|
mddev_t *mddev;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
printk(KERN_INFO "md: autorun ...\n");
|
|
while (!list_empty(&pending_raid_disks)) {
|
|
dev_t dev;
|
|
rdev0 = list_entry(pending_raid_disks.next,
|
|
mdk_rdev_t, same_set);
|
|
|
|
printk(KERN_INFO "md: considering %s ...\n",
|
|
bdevname(rdev0->bdev,b));
|
|
INIT_LIST_HEAD(&candidates);
|
|
ITERATE_RDEV_PENDING(rdev,tmp)
|
|
if (super_90_load(rdev, rdev0, 0) >= 0) {
|
|
printk(KERN_INFO "md: adding %s ...\n",
|
|
bdevname(rdev->bdev,b));
|
|
list_move(&rdev->same_set, &candidates);
|
|
}
|
|
/*
|
|
* now we have a set of devices, with all of them having
|
|
* mostly sane superblocks. It's time to allocate the
|
|
* mddev.
|
|
*/
|
|
if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
|
|
printk(KERN_INFO "md: unit number in %s is bad: %d\n",
|
|
bdevname(rdev0->bdev, b), rdev0->preferred_minor);
|
|
break;
|
|
}
|
|
if (part)
|
|
dev = MKDEV(mdp_major,
|
|
rdev0->preferred_minor << MdpMinorShift);
|
|
else
|
|
dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
|
|
|
|
md_probe(dev, NULL, NULL);
|
|
mddev = mddev_find(dev);
|
|
if (!mddev) {
|
|
printk(KERN_ERR
|
|
"md: cannot allocate memory for md drive.\n");
|
|
break;
|
|
}
|
|
if (mddev_lock(mddev))
|
|
printk(KERN_WARNING "md: %s locked, cannot run\n",
|
|
mdname(mddev));
|
|
else if (mddev->raid_disks || mddev->major_version
|
|
|| !list_empty(&mddev->disks)) {
|
|
printk(KERN_WARNING
|
|
"md: %s already running, cannot run %s\n",
|
|
mdname(mddev), bdevname(rdev0->bdev,b));
|
|
mddev_unlock(mddev);
|
|
} else {
|
|
printk(KERN_INFO "md: created %s\n", mdname(mddev));
|
|
ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
|
|
list_del_init(&rdev->same_set);
|
|
if (bind_rdev_to_array(rdev, mddev))
|
|
export_rdev(rdev);
|
|
}
|
|
autorun_array(mddev);
|
|
mddev_unlock(mddev);
|
|
}
|
|
/* on success, candidates will be empty, on error
|
|
* it won't...
|
|
*/
|
|
ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
|
|
export_rdev(rdev);
|
|
mddev_put(mddev);
|
|
}
|
|
printk(KERN_INFO "md: ... autorun DONE.\n");
|
|
}
|
|
|
|
/*
|
|
* import RAID devices based on one partition
|
|
* if possible, the array gets run as well.
|
|
*/
|
|
|
|
static int autostart_array(dev_t startdev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
int err = -EINVAL, i;
|
|
mdp_super_t *sb = NULL;
|
|
mdk_rdev_t *start_rdev = NULL, *rdev;
|
|
|
|
start_rdev = md_import_device(startdev, 0, 0);
|
|
if (IS_ERR(start_rdev))
|
|
return err;
|
|
|
|
|
|
/* NOTE: this can only work for 0.90.0 superblocks */
|
|
sb = (mdp_super_t*)page_address(start_rdev->sb_page);
|
|
if (sb->major_version != 0 ||
|
|
sb->minor_version != 90 ) {
|
|
printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
|
|
export_rdev(start_rdev);
|
|
return err;
|
|
}
|
|
|
|
if (start_rdev->faulty) {
|
|
printk(KERN_WARNING
|
|
"md: can not autostart based on faulty %s!\n",
|
|
bdevname(start_rdev->bdev,b));
|
|
export_rdev(start_rdev);
|
|
return err;
|
|
}
|
|
list_add(&start_rdev->same_set, &pending_raid_disks);
|
|
|
|
for (i = 0; i < MD_SB_DISKS; i++) {
|
|
mdp_disk_t *desc = sb->disks + i;
|
|
dev_t dev = MKDEV(desc->major, desc->minor);
|
|
|
|
if (!dev)
|
|
continue;
|
|
if (dev == startdev)
|
|
continue;
|
|
if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
|
|
continue;
|
|
rdev = md_import_device(dev, 0, 0);
|
|
if (IS_ERR(rdev))
|
|
continue;
|
|
|
|
list_add(&rdev->same_set, &pending_raid_disks);
|
|
}
|
|
|
|
/*
|
|
* possibly return codes
|
|
*/
|
|
autorun_devices(0);
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
static int get_version(void __user * arg)
|
|
{
|
|
mdu_version_t ver;
|
|
|
|
ver.major = MD_MAJOR_VERSION;
|
|
ver.minor = MD_MINOR_VERSION;
|
|
ver.patchlevel = MD_PATCHLEVEL_VERSION;
|
|
|
|
if (copy_to_user(arg, &ver, sizeof(ver)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_array_info(mddev_t * mddev, void __user * arg)
|
|
{
|
|
mdu_array_info_t info;
|
|
int nr,working,active,failed,spare;
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *tmp;
|
|
|
|
nr=working=active=failed=spare=0;
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
nr++;
|
|
if (rdev->faulty)
|
|
failed++;
|
|
else {
|
|
working++;
|
|
if (rdev->in_sync)
|
|
active++;
|
|
else
|
|
spare++;
|
|
}
|
|
}
|
|
|
|
info.major_version = mddev->major_version;
|
|
info.minor_version = mddev->minor_version;
|
|
info.patch_version = MD_PATCHLEVEL_VERSION;
|
|
info.ctime = mddev->ctime;
|
|
info.level = mddev->level;
|
|
info.size = mddev->size;
|
|
info.nr_disks = nr;
|
|
info.raid_disks = mddev->raid_disks;
|
|
info.md_minor = mddev->md_minor;
|
|
info.not_persistent= !mddev->persistent;
|
|
|
|
info.utime = mddev->utime;
|
|
info.state = 0;
|
|
if (mddev->in_sync)
|
|
info.state = (1<<MD_SB_CLEAN);
|
|
info.active_disks = active;
|
|
info.working_disks = working;
|
|
info.failed_disks = failed;
|
|
info.spare_disks = spare;
|
|
|
|
info.layout = mddev->layout;
|
|
info.chunk_size = mddev->chunk_size;
|
|
|
|
if (copy_to_user(arg, &info, sizeof(info)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_disk_info(mddev_t * mddev, void __user * arg)
|
|
{
|
|
mdu_disk_info_t info;
|
|
unsigned int nr;
|
|
mdk_rdev_t *rdev;
|
|
|
|
if (copy_from_user(&info, arg, sizeof(info)))
|
|
return -EFAULT;
|
|
|
|
nr = info.number;
|
|
|
|
rdev = find_rdev_nr(mddev, nr);
|
|
if (rdev) {
|
|
info.major = MAJOR(rdev->bdev->bd_dev);
|
|
info.minor = MINOR(rdev->bdev->bd_dev);
|
|
info.raid_disk = rdev->raid_disk;
|
|
info.state = 0;
|
|
if (rdev->faulty)
|
|
info.state |= (1<<MD_DISK_FAULTY);
|
|
else if (rdev->in_sync) {
|
|
info.state |= (1<<MD_DISK_ACTIVE);
|
|
info.state |= (1<<MD_DISK_SYNC);
|
|
}
|
|
} else {
|
|
info.major = info.minor = 0;
|
|
info.raid_disk = -1;
|
|
info.state = (1<<MD_DISK_REMOVED);
|
|
}
|
|
|
|
if (copy_to_user(arg, &info, sizeof(info)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
|
|
{
|
|
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
|
|
mdk_rdev_t *rdev;
|
|
dev_t dev = MKDEV(info->major,info->minor);
|
|
|
|
if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
|
|
return -EOVERFLOW;
|
|
|
|
if (!mddev->raid_disks) {
|
|
int err;
|
|
/* expecting a device which has a superblock */
|
|
rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
|
|
if (IS_ERR(rdev)) {
|
|
printk(KERN_WARNING
|
|
"md: md_import_device returned %ld\n",
|
|
PTR_ERR(rdev));
|
|
return PTR_ERR(rdev);
|
|
}
|
|
if (!list_empty(&mddev->disks)) {
|
|
mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
|
|
mdk_rdev_t, same_set);
|
|
int err = super_types[mddev->major_version]
|
|
.load_super(rdev, rdev0, mddev->minor_version);
|
|
if (err < 0) {
|
|
printk(KERN_WARNING
|
|
"md: %s has different UUID to %s\n",
|
|
bdevname(rdev->bdev,b),
|
|
bdevname(rdev0->bdev,b2));
|
|
export_rdev(rdev);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
err = bind_rdev_to_array(rdev, mddev);
|
|
if (err)
|
|
export_rdev(rdev);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* add_new_disk can be used once the array is assembled
|
|
* to add "hot spares". They must already have a superblock
|
|
* written
|
|
*/
|
|
if (mddev->pers) {
|
|
int err;
|
|
if (!mddev->pers->hot_add_disk) {
|
|
printk(KERN_WARNING
|
|
"%s: personality does not support diskops!\n",
|
|
mdname(mddev));
|
|
return -EINVAL;
|
|
}
|
|
rdev = md_import_device(dev, mddev->major_version,
|
|
mddev->minor_version);
|
|
if (IS_ERR(rdev)) {
|
|
printk(KERN_WARNING
|
|
"md: md_import_device returned %ld\n",
|
|
PTR_ERR(rdev));
|
|
return PTR_ERR(rdev);
|
|
}
|
|
rdev->in_sync = 0; /* just to be sure */
|
|
rdev->raid_disk = -1;
|
|
err = bind_rdev_to_array(rdev, mddev);
|
|
if (err)
|
|
export_rdev(rdev);
|
|
if (mddev->thread)
|
|
md_wakeup_thread(mddev->thread);
|
|
return err;
|
|
}
|
|
|
|
/* otherwise, add_new_disk is only allowed
|
|
* for major_version==0 superblocks
|
|
*/
|
|
if (mddev->major_version != 0) {
|
|
printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
|
|
mdname(mddev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!(info->state & (1<<MD_DISK_FAULTY))) {
|
|
int err;
|
|
rdev = md_import_device (dev, -1, 0);
|
|
if (IS_ERR(rdev)) {
|
|
printk(KERN_WARNING
|
|
"md: error, md_import_device() returned %ld\n",
|
|
PTR_ERR(rdev));
|
|
return PTR_ERR(rdev);
|
|
}
|
|
rdev->desc_nr = info->number;
|
|
if (info->raid_disk < mddev->raid_disks)
|
|
rdev->raid_disk = info->raid_disk;
|
|
else
|
|
rdev->raid_disk = -1;
|
|
|
|
rdev->faulty = 0;
|
|
if (rdev->raid_disk < mddev->raid_disks)
|
|
rdev->in_sync = (info->state & (1<<MD_DISK_SYNC));
|
|
else
|
|
rdev->in_sync = 0;
|
|
|
|
err = bind_rdev_to_array(rdev, mddev);
|
|
if (err) {
|
|
export_rdev(rdev);
|
|
return err;
|
|
}
|
|
|
|
if (!mddev->persistent) {
|
|
printk(KERN_INFO "md: nonpersistent superblock ...\n");
|
|
rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
|
|
} else
|
|
rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
|
|
rdev->size = calc_dev_size(rdev, mddev->chunk_size);
|
|
|
|
if (!mddev->size || (mddev->size > rdev->size))
|
|
mddev->size = rdev->size;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hot_remove_disk(mddev_t * mddev, dev_t dev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
mdk_rdev_t *rdev;
|
|
|
|
if (!mddev->pers)
|
|
return -ENODEV;
|
|
|
|
rdev = find_rdev(mddev, dev);
|
|
if (!rdev)
|
|
return -ENXIO;
|
|
|
|
if (rdev->raid_disk >= 0)
|
|
goto busy;
|
|
|
|
kick_rdev_from_array(rdev);
|
|
md_update_sb(mddev);
|
|
|
|
return 0;
|
|
busy:
|
|
printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
|
|
bdevname(rdev->bdev,b), mdname(mddev));
|
|
return -EBUSY;
|
|
}
|
|
|
|
static int hot_add_disk(mddev_t * mddev, dev_t dev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
int err;
|
|
unsigned int size;
|
|
mdk_rdev_t *rdev;
|
|
|
|
if (!mddev->pers)
|
|
return -ENODEV;
|
|
|
|
if (mddev->major_version != 0) {
|
|
printk(KERN_WARNING "%s: HOT_ADD may only be used with"
|
|
" version-0 superblocks.\n",
|
|
mdname(mddev));
|
|
return -EINVAL;
|
|
}
|
|
if (!mddev->pers->hot_add_disk) {
|
|
printk(KERN_WARNING
|
|
"%s: personality does not support diskops!\n",
|
|
mdname(mddev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
rdev = md_import_device (dev, -1, 0);
|
|
if (IS_ERR(rdev)) {
|
|
printk(KERN_WARNING
|
|
"md: error, md_import_device() returned %ld\n",
|
|
PTR_ERR(rdev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (mddev->persistent)
|
|
rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
|
|
else
|
|
rdev->sb_offset =
|
|
rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
|
|
|
|
size = calc_dev_size(rdev, mddev->chunk_size);
|
|
rdev->size = size;
|
|
|
|
if (size < mddev->size) {
|
|
printk(KERN_WARNING
|
|
"%s: disk size %llu blocks < array size %llu\n",
|
|
mdname(mddev), (unsigned long long)size,
|
|
(unsigned long long)mddev->size);
|
|
err = -ENOSPC;
|
|
goto abort_export;
|
|
}
|
|
|
|
if (rdev->faulty) {
|
|
printk(KERN_WARNING
|
|
"md: can not hot-add faulty %s disk to %s!\n",
|
|
bdevname(rdev->bdev,b), mdname(mddev));
|
|
err = -EINVAL;
|
|
goto abort_export;
|
|
}
|
|
rdev->in_sync = 0;
|
|
rdev->desc_nr = -1;
|
|
bind_rdev_to_array(rdev, mddev);
|
|
|
|
/*
|
|
* The rest should better be atomic, we can have disk failures
|
|
* noticed in interrupt contexts ...
|
|
*/
|
|
|
|
if (rdev->desc_nr == mddev->max_disks) {
|
|
printk(KERN_WARNING "%s: can not hot-add to full array!\n",
|
|
mdname(mddev));
|
|
err = -EBUSY;
|
|
goto abort_unbind_export;
|
|
}
|
|
|
|
rdev->raid_disk = -1;
|
|
|
|
md_update_sb(mddev);
|
|
|
|
/*
|
|
* Kick recovery, maybe this spare has to be added to the
|
|
* array immediately.
|
|
*/
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
|
|
return 0;
|
|
|
|
abort_unbind_export:
|
|
unbind_rdev_from_array(rdev);
|
|
|
|
abort_export:
|
|
export_rdev(rdev);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* set_array_info is used two different ways
|
|
* The original usage is when creating a new array.
|
|
* In this usage, raid_disks is > 0 and it together with
|
|
* level, size, not_persistent,layout,chunksize determine the
|
|
* shape of the array.
|
|
* This will always create an array with a type-0.90.0 superblock.
|
|
* The newer usage is when assembling an array.
|
|
* In this case raid_disks will be 0, and the major_version field is
|
|
* use to determine which style super-blocks are to be found on the devices.
|
|
* The minor and patch _version numbers are also kept incase the
|
|
* super_block handler wishes to interpret them.
|
|
*/
|
|
static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
|
|
{
|
|
|
|
if (info->raid_disks == 0) {
|
|
/* just setting version number for superblock loading */
|
|
if (info->major_version < 0 ||
|
|
info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
|
|
super_types[info->major_version].name == NULL) {
|
|
/* maybe try to auto-load a module? */
|
|
printk(KERN_INFO
|
|
"md: superblock version %d not known\n",
|
|
info->major_version);
|
|
return -EINVAL;
|
|
}
|
|
mddev->major_version = info->major_version;
|
|
mddev->minor_version = info->minor_version;
|
|
mddev->patch_version = info->patch_version;
|
|
return 0;
|
|
}
|
|
mddev->major_version = MD_MAJOR_VERSION;
|
|
mddev->minor_version = MD_MINOR_VERSION;
|
|
mddev->patch_version = MD_PATCHLEVEL_VERSION;
|
|
mddev->ctime = get_seconds();
|
|
|
|
mddev->level = info->level;
|
|
mddev->size = info->size;
|
|
mddev->raid_disks = info->raid_disks;
|
|
/* don't set md_minor, it is determined by which /dev/md* was
|
|
* openned
|
|
*/
|
|
if (info->state & (1<<MD_SB_CLEAN))
|
|
mddev->recovery_cp = MaxSector;
|
|
else
|
|
mddev->recovery_cp = 0;
|
|
mddev->persistent = ! info->not_persistent;
|
|
|
|
mddev->layout = info->layout;
|
|
mddev->chunk_size = info->chunk_size;
|
|
|
|
mddev->max_disks = MD_SB_DISKS;
|
|
|
|
mddev->sb_dirty = 1;
|
|
|
|
/*
|
|
* Generate a 128 bit UUID
|
|
*/
|
|
get_random_bytes(mddev->uuid, 16);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* update_array_info is used to change the configuration of an
|
|
* on-line array.
|
|
* The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
|
|
* fields in the info are checked against the array.
|
|
* Any differences that cannot be handled will cause an error.
|
|
* Normally, only one change can be managed at a time.
|
|
*/
|
|
static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
|
|
{
|
|
int rv = 0;
|
|
int cnt = 0;
|
|
|
|
if (mddev->major_version != info->major_version ||
|
|
mddev->minor_version != info->minor_version ||
|
|
/* mddev->patch_version != info->patch_version || */
|
|
mddev->ctime != info->ctime ||
|
|
mddev->level != info->level ||
|
|
/* mddev->layout != info->layout || */
|
|
!mddev->persistent != info->not_persistent||
|
|
mddev->chunk_size != info->chunk_size )
|
|
return -EINVAL;
|
|
/* Check there is only one change */
|
|
if (mddev->size != info->size) cnt++;
|
|
if (mddev->raid_disks != info->raid_disks) cnt++;
|
|
if (mddev->layout != info->layout) cnt++;
|
|
if (cnt == 0) return 0;
|
|
if (cnt > 1) return -EINVAL;
|
|
|
|
if (mddev->layout != info->layout) {
|
|
/* Change layout
|
|
* we don't need to do anything at the md level, the
|
|
* personality will take care of it all.
|
|
*/
|
|
if (mddev->pers->reconfig == NULL)
|
|
return -EINVAL;
|
|
else
|
|
return mddev->pers->reconfig(mddev, info->layout, -1);
|
|
}
|
|
if (mddev->size != info->size) {
|
|
mdk_rdev_t * rdev;
|
|
struct list_head *tmp;
|
|
if (mddev->pers->resize == NULL)
|
|
return -EINVAL;
|
|
/* The "size" is the amount of each device that is used.
|
|
* This can only make sense for arrays with redundancy.
|
|
* linear and raid0 always use whatever space is available
|
|
* We can only consider changing the size if no resync
|
|
* or reconstruction is happening, and if the new size
|
|
* is acceptable. It must fit before the sb_offset or,
|
|
* if that is <data_offset, it must fit before the
|
|
* size of each device.
|
|
* If size is zero, we find the largest size that fits.
|
|
*/
|
|
if (mddev->sync_thread)
|
|
return -EBUSY;
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
sector_t avail;
|
|
int fit = (info->size == 0);
|
|
if (rdev->sb_offset > rdev->data_offset)
|
|
avail = (rdev->sb_offset*2) - rdev->data_offset;
|
|
else
|
|
avail = get_capacity(rdev->bdev->bd_disk)
|
|
- rdev->data_offset;
|
|
if (fit && (info->size == 0 || info->size > avail/2))
|
|
info->size = avail/2;
|
|
if (avail < ((sector_t)info->size << 1))
|
|
return -ENOSPC;
|
|
}
|
|
rv = mddev->pers->resize(mddev, (sector_t)info->size *2);
|
|
if (!rv) {
|
|
struct block_device *bdev;
|
|
|
|
bdev = bdget_disk(mddev->gendisk, 0);
|
|
if (bdev) {
|
|
down(&bdev->bd_inode->i_sem);
|
|
i_size_write(bdev->bd_inode, mddev->array_size << 10);
|
|
up(&bdev->bd_inode->i_sem);
|
|
bdput(bdev);
|
|
}
|
|
}
|
|
}
|
|
if (mddev->raid_disks != info->raid_disks) {
|
|
/* change the number of raid disks */
|
|
if (mddev->pers->reshape == NULL)
|
|
return -EINVAL;
|
|
if (info->raid_disks <= 0 ||
|
|
info->raid_disks >= mddev->max_disks)
|
|
return -EINVAL;
|
|
if (mddev->sync_thread)
|
|
return -EBUSY;
|
|
rv = mddev->pers->reshape(mddev, info->raid_disks);
|
|
if (!rv) {
|
|
struct block_device *bdev;
|
|
|
|
bdev = bdget_disk(mddev->gendisk, 0);
|
|
if (bdev) {
|
|
down(&bdev->bd_inode->i_sem);
|
|
i_size_write(bdev->bd_inode, mddev->array_size << 10);
|
|
up(&bdev->bd_inode->i_sem);
|
|
bdput(bdev);
|
|
}
|
|
}
|
|
}
|
|
md_update_sb(mddev);
|
|
return rv;
|
|
}
|
|
|
|
static int set_disk_faulty(mddev_t *mddev, dev_t dev)
|
|
{
|
|
mdk_rdev_t *rdev;
|
|
|
|
if (mddev->pers == NULL)
|
|
return -ENODEV;
|
|
|
|
rdev = find_rdev(mddev, dev);
|
|
if (!rdev)
|
|
return -ENODEV;
|
|
|
|
md_error(mddev, rdev);
|
|
return 0;
|
|
}
|
|
|
|
static int md_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
int err = 0;
|
|
void __user *argp = (void __user *)arg;
|
|
struct hd_geometry __user *loc = argp;
|
|
mddev_t *mddev = NULL;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
|
|
/*
|
|
* Commands dealing with the RAID driver but not any
|
|
* particular array:
|
|
*/
|
|
switch (cmd)
|
|
{
|
|
case RAID_VERSION:
|
|
err = get_version(argp);
|
|
goto done;
|
|
|
|
case PRINT_RAID_DEBUG:
|
|
err = 0;
|
|
md_print_devices();
|
|
goto done;
|
|
|
|
#ifndef MODULE
|
|
case RAID_AUTORUN:
|
|
err = 0;
|
|
autostart_arrays(arg);
|
|
goto done;
|
|
#endif
|
|
default:;
|
|
}
|
|
|
|
/*
|
|
* Commands creating/starting a new array:
|
|
*/
|
|
|
|
mddev = inode->i_bdev->bd_disk->private_data;
|
|
|
|
if (!mddev) {
|
|
BUG();
|
|
goto abort;
|
|
}
|
|
|
|
|
|
if (cmd == START_ARRAY) {
|
|
/* START_ARRAY doesn't need to lock the array as autostart_array
|
|
* does the locking, and it could even be a different array
|
|
*/
|
|
static int cnt = 3;
|
|
if (cnt > 0 ) {
|
|
printk(KERN_WARNING
|
|
"md: %s(pid %d) used deprecated START_ARRAY ioctl. "
|
|
"This will not be supported beyond 2.6\n",
|
|
current->comm, current->pid);
|
|
cnt--;
|
|
}
|
|
err = autostart_array(new_decode_dev(arg));
|
|
if (err) {
|
|
printk(KERN_WARNING "md: autostart failed!\n");
|
|
goto abort;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
err = mddev_lock(mddev);
|
|
if (err) {
|
|
printk(KERN_INFO
|
|
"md: ioctl lock interrupted, reason %d, cmd %d\n",
|
|
err, cmd);
|
|
goto abort;
|
|
}
|
|
|
|
switch (cmd)
|
|
{
|
|
case SET_ARRAY_INFO:
|
|
{
|
|
mdu_array_info_t info;
|
|
if (!arg)
|
|
memset(&info, 0, sizeof(info));
|
|
else if (copy_from_user(&info, argp, sizeof(info))) {
|
|
err = -EFAULT;
|
|
goto abort_unlock;
|
|
}
|
|
if (mddev->pers) {
|
|
err = update_array_info(mddev, &info);
|
|
if (err) {
|
|
printk(KERN_WARNING "md: couldn't update"
|
|
" array info. %d\n", err);
|
|
goto abort_unlock;
|
|
}
|
|
goto done_unlock;
|
|
}
|
|
if (!list_empty(&mddev->disks)) {
|
|
printk(KERN_WARNING
|
|
"md: array %s already has disks!\n",
|
|
mdname(mddev));
|
|
err = -EBUSY;
|
|
goto abort_unlock;
|
|
}
|
|
if (mddev->raid_disks) {
|
|
printk(KERN_WARNING
|
|
"md: array %s already initialised!\n",
|
|
mdname(mddev));
|
|
err = -EBUSY;
|
|
goto abort_unlock;
|
|
}
|
|
err = set_array_info(mddev, &info);
|
|
if (err) {
|
|
printk(KERN_WARNING "md: couldn't set"
|
|
" array info. %d\n", err);
|
|
goto abort_unlock;
|
|
}
|
|
}
|
|
goto done_unlock;
|
|
|
|
default:;
|
|
}
|
|
|
|
/*
|
|
* Commands querying/configuring an existing array:
|
|
*/
|
|
/* if we are initialised yet, only ADD_NEW_DISK or STOP_ARRAY is allowed */
|
|
if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY && cmd != RUN_ARRAY) {
|
|
err = -ENODEV;
|
|
goto abort_unlock;
|
|
}
|
|
|
|
/*
|
|
* Commands even a read-only array can execute:
|
|
*/
|
|
switch (cmd)
|
|
{
|
|
case GET_ARRAY_INFO:
|
|
err = get_array_info(mddev, argp);
|
|
goto done_unlock;
|
|
|
|
case GET_DISK_INFO:
|
|
err = get_disk_info(mddev, argp);
|
|
goto done_unlock;
|
|
|
|
case RESTART_ARRAY_RW:
|
|
err = restart_array(mddev);
|
|
goto done_unlock;
|
|
|
|
case STOP_ARRAY:
|
|
err = do_md_stop (mddev, 0);
|
|
goto done_unlock;
|
|
|
|
case STOP_ARRAY_RO:
|
|
err = do_md_stop (mddev, 1);
|
|
goto done_unlock;
|
|
|
|
/*
|
|
* We have a problem here : there is no easy way to give a CHS
|
|
* virtual geometry. We currently pretend that we have a 2 heads
|
|
* 4 sectors (with a BIG number of cylinders...). This drives
|
|
* dosfs just mad... ;-)
|
|
*/
|
|
case HDIO_GETGEO:
|
|
if (!loc) {
|
|
err = -EINVAL;
|
|
goto abort_unlock;
|
|
}
|
|
err = put_user (2, (char __user *) &loc->heads);
|
|
if (err)
|
|
goto abort_unlock;
|
|
err = put_user (4, (char __user *) &loc->sectors);
|
|
if (err)
|
|
goto abort_unlock;
|
|
err = put_user(get_capacity(mddev->gendisk)/8,
|
|
(short __user *) &loc->cylinders);
|
|
if (err)
|
|
goto abort_unlock;
|
|
err = put_user (get_start_sect(inode->i_bdev),
|
|
(long __user *) &loc->start);
|
|
goto done_unlock;
|
|
}
|
|
|
|
/*
|
|
* The remaining ioctls are changing the state of the
|
|
* superblock, so we do not allow read-only arrays
|
|
* here:
|
|
*/
|
|
if (mddev->ro) {
|
|
err = -EROFS;
|
|
goto abort_unlock;
|
|
}
|
|
|
|
switch (cmd)
|
|
{
|
|
case ADD_NEW_DISK:
|
|
{
|
|
mdu_disk_info_t info;
|
|
if (copy_from_user(&info, argp, sizeof(info)))
|
|
err = -EFAULT;
|
|
else
|
|
err = add_new_disk(mddev, &info);
|
|
goto done_unlock;
|
|
}
|
|
|
|
case HOT_REMOVE_DISK:
|
|
err = hot_remove_disk(mddev, new_decode_dev(arg));
|
|
goto done_unlock;
|
|
|
|
case HOT_ADD_DISK:
|
|
err = hot_add_disk(mddev, new_decode_dev(arg));
|
|
goto done_unlock;
|
|
|
|
case SET_DISK_FAULTY:
|
|
err = set_disk_faulty(mddev, new_decode_dev(arg));
|
|
goto done_unlock;
|
|
|
|
case RUN_ARRAY:
|
|
err = do_md_run (mddev);
|
|
goto done_unlock;
|
|
|
|
default:
|
|
if (_IOC_TYPE(cmd) == MD_MAJOR)
|
|
printk(KERN_WARNING "md: %s(pid %d) used"
|
|
" obsolete MD ioctl, upgrade your"
|
|
" software to use new ictls.\n",
|
|
current->comm, current->pid);
|
|
err = -EINVAL;
|
|
goto abort_unlock;
|
|
}
|
|
|
|
done_unlock:
|
|
abort_unlock:
|
|
mddev_unlock(mddev);
|
|
|
|
return err;
|
|
done:
|
|
if (err)
|
|
MD_BUG();
|
|
abort:
|
|
return err;
|
|
}
|
|
|
|
static int md_open(struct inode *inode, struct file *file)
|
|
{
|
|
/*
|
|
* Succeed if we can lock the mddev, which confirms that
|
|
* it isn't being stopped right now.
|
|
*/
|
|
mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
|
|
int err;
|
|
|
|
if ((err = mddev_lock(mddev)))
|
|
goto out;
|
|
|
|
err = 0;
|
|
mddev_get(mddev);
|
|
mddev_unlock(mddev);
|
|
|
|
check_disk_change(inode->i_bdev);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int md_release(struct inode *inode, struct file * file)
|
|
{
|
|
mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
|
|
|
|
if (!mddev)
|
|
BUG();
|
|
mddev_put(mddev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int md_media_changed(struct gendisk *disk)
|
|
{
|
|
mddev_t *mddev = disk->private_data;
|
|
|
|
return mddev->changed;
|
|
}
|
|
|
|
static int md_revalidate(struct gendisk *disk)
|
|
{
|
|
mddev_t *mddev = disk->private_data;
|
|
|
|
mddev->changed = 0;
|
|
return 0;
|
|
}
|
|
static struct block_device_operations md_fops =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.open = md_open,
|
|
.release = md_release,
|
|
.ioctl = md_ioctl,
|
|
.media_changed = md_media_changed,
|
|
.revalidate_disk= md_revalidate,
|
|
};
|
|
|
|
int md_thread(void * arg)
|
|
{
|
|
mdk_thread_t *thread = arg;
|
|
|
|
lock_kernel();
|
|
|
|
/*
|
|
* Detach thread
|
|
*/
|
|
|
|
daemonize(thread->name, mdname(thread->mddev));
|
|
|
|
current->exit_signal = SIGCHLD;
|
|
allow_signal(SIGKILL);
|
|
thread->tsk = current;
|
|
|
|
/*
|
|
* md_thread is a 'system-thread', it's priority should be very
|
|
* high. We avoid resource deadlocks individually in each
|
|
* raid personality. (RAID5 does preallocation) We also use RR and
|
|
* the very same RT priority as kswapd, thus we will never get
|
|
* into a priority inversion deadlock.
|
|
*
|
|
* we definitely have to have equal or higher priority than
|
|
* bdflush, otherwise bdflush will deadlock if there are too
|
|
* many dirty RAID5 blocks.
|
|
*/
|
|
unlock_kernel();
|
|
|
|
complete(thread->event);
|
|
while (thread->run) {
|
|
void (*run)(mddev_t *);
|
|
|
|
wait_event_interruptible(thread->wqueue,
|
|
test_bit(THREAD_WAKEUP, &thread->flags));
|
|
if (current->flags & PF_FREEZE)
|
|
refrigerator(PF_FREEZE);
|
|
|
|
clear_bit(THREAD_WAKEUP, &thread->flags);
|
|
|
|
run = thread->run;
|
|
if (run)
|
|
run(thread->mddev);
|
|
|
|
if (signal_pending(current))
|
|
flush_signals(current);
|
|
}
|
|
complete(thread->event);
|
|
return 0;
|
|
}
|
|
|
|
void md_wakeup_thread(mdk_thread_t *thread)
|
|
{
|
|
if (thread) {
|
|
dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
|
|
set_bit(THREAD_WAKEUP, &thread->flags);
|
|
wake_up(&thread->wqueue);
|
|
}
|
|
}
|
|
|
|
mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
|
|
const char *name)
|
|
{
|
|
mdk_thread_t *thread;
|
|
int ret;
|
|
struct completion event;
|
|
|
|
thread = (mdk_thread_t *) kmalloc
|
|
(sizeof(mdk_thread_t), GFP_KERNEL);
|
|
if (!thread)
|
|
return NULL;
|
|
|
|
memset(thread, 0, sizeof(mdk_thread_t));
|
|
init_waitqueue_head(&thread->wqueue);
|
|
|
|
init_completion(&event);
|
|
thread->event = &event;
|
|
thread->run = run;
|
|
thread->mddev = mddev;
|
|
thread->name = name;
|
|
ret = kernel_thread(md_thread, thread, 0);
|
|
if (ret < 0) {
|
|
kfree(thread);
|
|
return NULL;
|
|
}
|
|
wait_for_completion(&event);
|
|
return thread;
|
|
}
|
|
|
|
void md_unregister_thread(mdk_thread_t *thread)
|
|
{
|
|
struct completion event;
|
|
|
|
init_completion(&event);
|
|
|
|
thread->event = &event;
|
|
|
|
/* As soon as ->run is set to NULL, the task could disappear,
|
|
* so we need to hold tasklist_lock until we have sent the signal
|
|
*/
|
|
dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
|
|
read_lock(&tasklist_lock);
|
|
thread->run = NULL;
|
|
send_sig(SIGKILL, thread->tsk, 1);
|
|
read_unlock(&tasklist_lock);
|
|
wait_for_completion(&event);
|
|
kfree(thread);
|
|
}
|
|
|
|
void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
|
|
{
|
|
if (!mddev) {
|
|
MD_BUG();
|
|
return;
|
|
}
|
|
|
|
if (!rdev || rdev->faulty)
|
|
return;
|
|
|
|
dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
|
|
mdname(mddev),
|
|
MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
|
|
__builtin_return_address(0),__builtin_return_address(1),
|
|
__builtin_return_address(2),__builtin_return_address(3));
|
|
|
|
if (!mddev->pers->error_handler)
|
|
return;
|
|
mddev->pers->error_handler(mddev,rdev);
|
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
}
|
|
|
|
/* seq_file implementation /proc/mdstat */
|
|
|
|
static void status_unused(struct seq_file *seq)
|
|
{
|
|
int i = 0;
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *tmp;
|
|
|
|
seq_printf(seq, "unused devices: ");
|
|
|
|
ITERATE_RDEV_PENDING(rdev,tmp) {
|
|
char b[BDEVNAME_SIZE];
|
|
i++;
|
|
seq_printf(seq, "%s ",
|
|
bdevname(rdev->bdev,b));
|
|
}
|
|
if (!i)
|
|
seq_printf(seq, "<none>");
|
|
|
|
seq_printf(seq, "\n");
|
|
}
|
|
|
|
|
|
static void status_resync(struct seq_file *seq, mddev_t * mddev)
|
|
{
|
|
unsigned long max_blocks, resync, res, dt, db, rt;
|
|
|
|
resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
|
|
|
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
|
|
max_blocks = mddev->resync_max_sectors >> 1;
|
|
else
|
|
max_blocks = mddev->size;
|
|
|
|
/*
|
|
* Should not happen.
|
|
*/
|
|
if (!max_blocks) {
|
|
MD_BUG();
|
|
return;
|
|
}
|
|
res = (resync/1024)*1000/(max_blocks/1024 + 1);
|
|
{
|
|
int i, x = res/50, y = 20-x;
|
|
seq_printf(seq, "[");
|
|
for (i = 0; i < x; i++)
|
|
seq_printf(seq, "=");
|
|
seq_printf(seq, ">");
|
|
for (i = 0; i < y; i++)
|
|
seq_printf(seq, ".");
|
|
seq_printf(seq, "] ");
|
|
}
|
|
seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
|
|
(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
|
|
"resync" : "recovery"),
|
|
res/10, res % 10, resync, max_blocks);
|
|
|
|
/*
|
|
* We do not want to overflow, so the order of operands and
|
|
* the * 100 / 100 trick are important. We do a +1 to be
|
|
* safe against division by zero. We only estimate anyway.
|
|
*
|
|
* dt: time from mark until now
|
|
* db: blocks written from mark until now
|
|
* rt: remaining time
|
|
*/
|
|
dt = ((jiffies - mddev->resync_mark) / HZ);
|
|
if (!dt) dt++;
|
|
db = resync - (mddev->resync_mark_cnt/2);
|
|
rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
|
|
|
|
seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
|
|
|
|
seq_printf(seq, " speed=%ldK/sec", db/dt);
|
|
}
|
|
|
|
static void *md_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct list_head *tmp;
|
|
loff_t l = *pos;
|
|
mddev_t *mddev;
|
|
|
|
if (l >= 0x10000)
|
|
return NULL;
|
|
if (!l--)
|
|
/* header */
|
|
return (void*)1;
|
|
|
|
spin_lock(&all_mddevs_lock);
|
|
list_for_each(tmp,&all_mddevs)
|
|
if (!l--) {
|
|
mddev = list_entry(tmp, mddev_t, all_mddevs);
|
|
mddev_get(mddev);
|
|
spin_unlock(&all_mddevs_lock);
|
|
return mddev;
|
|
}
|
|
spin_unlock(&all_mddevs_lock);
|
|
if (!l--)
|
|
return (void*)2;/* tail */
|
|
return NULL;
|
|
}
|
|
|
|
static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct list_head *tmp;
|
|
mddev_t *next_mddev, *mddev = v;
|
|
|
|
++*pos;
|
|
if (v == (void*)2)
|
|
return NULL;
|
|
|
|
spin_lock(&all_mddevs_lock);
|
|
if (v == (void*)1)
|
|
tmp = all_mddevs.next;
|
|
else
|
|
tmp = mddev->all_mddevs.next;
|
|
if (tmp != &all_mddevs)
|
|
next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
|
|
else {
|
|
next_mddev = (void*)2;
|
|
*pos = 0x10000;
|
|
}
|
|
spin_unlock(&all_mddevs_lock);
|
|
|
|
if (v != (void*)1)
|
|
mddev_put(mddev);
|
|
return next_mddev;
|
|
|
|
}
|
|
|
|
static void md_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
mddev_t *mddev = v;
|
|
|
|
if (mddev && v != (void*)1 && v != (void*)2)
|
|
mddev_put(mddev);
|
|
}
|
|
|
|
static int md_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
mddev_t *mddev = v;
|
|
sector_t size;
|
|
struct list_head *tmp2;
|
|
mdk_rdev_t *rdev;
|
|
int i;
|
|
|
|
if (v == (void*)1) {
|
|
seq_printf(seq, "Personalities : ");
|
|
spin_lock(&pers_lock);
|
|
for (i = 0; i < MAX_PERSONALITY; i++)
|
|
if (pers[i])
|
|
seq_printf(seq, "[%s] ", pers[i]->name);
|
|
|
|
spin_unlock(&pers_lock);
|
|
seq_printf(seq, "\n");
|
|
return 0;
|
|
}
|
|
if (v == (void*)2) {
|
|
status_unused(seq);
|
|
return 0;
|
|
}
|
|
|
|
if (mddev_lock(mddev)!=0)
|
|
return -EINTR;
|
|
if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
|
|
seq_printf(seq, "%s : %sactive", mdname(mddev),
|
|
mddev->pers ? "" : "in");
|
|
if (mddev->pers) {
|
|
if (mddev->ro)
|
|
seq_printf(seq, " (read-only)");
|
|
seq_printf(seq, " %s", mddev->pers->name);
|
|
}
|
|
|
|
size = 0;
|
|
ITERATE_RDEV(mddev,rdev,tmp2) {
|
|
char b[BDEVNAME_SIZE];
|
|
seq_printf(seq, " %s[%d]",
|
|
bdevname(rdev->bdev,b), rdev->desc_nr);
|
|
if (rdev->faulty) {
|
|
seq_printf(seq, "(F)");
|
|
continue;
|
|
}
|
|
size += rdev->size;
|
|
}
|
|
|
|
if (!list_empty(&mddev->disks)) {
|
|
if (mddev->pers)
|
|
seq_printf(seq, "\n %llu blocks",
|
|
(unsigned long long)mddev->array_size);
|
|
else
|
|
seq_printf(seq, "\n %llu blocks",
|
|
(unsigned long long)size);
|
|
}
|
|
|
|
if (mddev->pers) {
|
|
mddev->pers->status (seq, mddev);
|
|
seq_printf(seq, "\n ");
|
|
if (mddev->curr_resync > 2)
|
|
status_resync (seq, mddev);
|
|
else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
|
|
seq_printf(seq, " resync=DELAYED");
|
|
}
|
|
|
|
seq_printf(seq, "\n");
|
|
}
|
|
mddev_unlock(mddev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct seq_operations md_seq_ops = {
|
|
.start = md_seq_start,
|
|
.next = md_seq_next,
|
|
.stop = md_seq_stop,
|
|
.show = md_seq_show,
|
|
};
|
|
|
|
static int md_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
int error;
|
|
|
|
error = seq_open(file, &md_seq_ops);
|
|
return error;
|
|
}
|
|
|
|
static struct file_operations md_seq_fops = {
|
|
.open = md_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
int register_md_personality(int pnum, mdk_personality_t *p)
|
|
{
|
|
if (pnum >= MAX_PERSONALITY) {
|
|
printk(KERN_ERR
|
|
"md: tried to install personality %s as nr %d, but max is %lu\n",
|
|
p->name, pnum, MAX_PERSONALITY-1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock(&pers_lock);
|
|
if (pers[pnum]) {
|
|
spin_unlock(&pers_lock);
|
|
return -EBUSY;
|
|
}
|
|
|
|
pers[pnum] = p;
|
|
printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum);
|
|
spin_unlock(&pers_lock);
|
|
return 0;
|
|
}
|
|
|
|
int unregister_md_personality(int pnum)
|
|
{
|
|
if (pnum >= MAX_PERSONALITY)
|
|
return -EINVAL;
|
|
|
|
printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name);
|
|
spin_lock(&pers_lock);
|
|
pers[pnum] = NULL;
|
|
spin_unlock(&pers_lock);
|
|
return 0;
|
|
}
|
|
|
|
static int is_mddev_idle(mddev_t *mddev)
|
|
{
|
|
mdk_rdev_t * rdev;
|
|
struct list_head *tmp;
|
|
int idle;
|
|
unsigned long curr_events;
|
|
|
|
idle = 1;
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
|
|
curr_events = disk_stat_read(disk, read_sectors) +
|
|
disk_stat_read(disk, write_sectors) -
|
|
atomic_read(&disk->sync_io);
|
|
/* Allow some slack between valud of curr_events and last_events,
|
|
* as there are some uninteresting races.
|
|
* Note: the following is an unsigned comparison.
|
|
*/
|
|
if ((curr_events - rdev->last_events + 32) > 64) {
|
|
rdev->last_events = curr_events;
|
|
idle = 0;
|
|
}
|
|
}
|
|
return idle;
|
|
}
|
|
|
|
void md_done_sync(mddev_t *mddev, int blocks, int ok)
|
|
{
|
|
/* another "blocks" (512byte) blocks have been synced */
|
|
atomic_sub(blocks, &mddev->recovery_active);
|
|
wake_up(&mddev->recovery_wait);
|
|
if (!ok) {
|
|
set_bit(MD_RECOVERY_ERR, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
// stop recovery, signal do_sync ....
|
|
}
|
|
}
|
|
|
|
|
|
void md_write_start(mddev_t *mddev)
|
|
{
|
|
if (!atomic_read(&mddev->writes_pending)) {
|
|
mddev_lock_uninterruptible(mddev);
|
|
if (mddev->in_sync) {
|
|
mddev->in_sync = 0;
|
|
del_timer(&mddev->safemode_timer);
|
|
md_update_sb(mddev);
|
|
}
|
|
atomic_inc(&mddev->writes_pending);
|
|
mddev_unlock(mddev);
|
|
} else
|
|
atomic_inc(&mddev->writes_pending);
|
|
}
|
|
|
|
void md_write_end(mddev_t *mddev)
|
|
{
|
|
if (atomic_dec_and_test(&mddev->writes_pending)) {
|
|
if (mddev->safemode == 2)
|
|
md_wakeup_thread(mddev->thread);
|
|
else
|
|
mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
|
|
}
|
|
}
|
|
|
|
static inline void md_enter_safemode(mddev_t *mddev)
|
|
{
|
|
if (!mddev->safemode) return;
|
|
if (mddev->safemode == 2 &&
|
|
(atomic_read(&mddev->writes_pending) || mddev->in_sync ||
|
|
mddev->recovery_cp != MaxSector))
|
|
return; /* avoid the lock */
|
|
mddev_lock_uninterruptible(mddev);
|
|
if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
|
|
!mddev->in_sync && mddev->recovery_cp == MaxSector) {
|
|
mddev->in_sync = 1;
|
|
md_update_sb(mddev);
|
|
}
|
|
mddev_unlock(mddev);
|
|
|
|
if (mddev->safemode == 1)
|
|
mddev->safemode = 0;
|
|
}
|
|
|
|
void md_handle_safemode(mddev_t *mddev)
|
|
{
|
|
if (signal_pending(current)) {
|
|
printk(KERN_INFO "md: %s in immediate safe mode\n",
|
|
mdname(mddev));
|
|
mddev->safemode = 2;
|
|
flush_signals(current);
|
|
}
|
|
md_enter_safemode(mddev);
|
|
}
|
|
|
|
|
|
DECLARE_WAIT_QUEUE_HEAD(resync_wait);
|
|
|
|
#define SYNC_MARKS 10
|
|
#define SYNC_MARK_STEP (3*HZ)
|
|
static void md_do_sync(mddev_t *mddev)
|
|
{
|
|
mddev_t *mddev2;
|
|
unsigned int currspeed = 0,
|
|
window;
|
|
sector_t max_sectors,j;
|
|
unsigned long mark[SYNC_MARKS];
|
|
sector_t mark_cnt[SYNC_MARKS];
|
|
int last_mark,m;
|
|
struct list_head *tmp;
|
|
sector_t last_check;
|
|
|
|
/* just incase thread restarts... */
|
|
if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
|
|
return;
|
|
|
|
/* we overload curr_resync somewhat here.
|
|
* 0 == not engaged in resync at all
|
|
* 2 == checking that there is no conflict with another sync
|
|
* 1 == like 2, but have yielded to allow conflicting resync to
|
|
* commense
|
|
* other == active in resync - this many blocks
|
|
*
|
|
* Before starting a resync we must have set curr_resync to
|
|
* 2, and then checked that every "conflicting" array has curr_resync
|
|
* less than ours. When we find one that is the same or higher
|
|
* we wait on resync_wait. To avoid deadlock, we reduce curr_resync
|
|
* to 1 if we choose to yield (based arbitrarily on address of mddev structure).
|
|
* This will mean we have to start checking from the beginning again.
|
|
*
|
|
*/
|
|
|
|
do {
|
|
mddev->curr_resync = 2;
|
|
|
|
try_again:
|
|
if (signal_pending(current)) {
|
|
flush_signals(current);
|
|
goto skip;
|
|
}
|
|
ITERATE_MDDEV(mddev2,tmp) {
|
|
printk(".");
|
|
if (mddev2 == mddev)
|
|
continue;
|
|
if (mddev2->curr_resync &&
|
|
match_mddev_units(mddev,mddev2)) {
|
|
DEFINE_WAIT(wq);
|
|
if (mddev < mddev2 && mddev->curr_resync == 2) {
|
|
/* arbitrarily yield */
|
|
mddev->curr_resync = 1;
|
|
wake_up(&resync_wait);
|
|
}
|
|
if (mddev > mddev2 && mddev->curr_resync == 1)
|
|
/* no need to wait here, we can wait the next
|
|
* time 'round when curr_resync == 2
|
|
*/
|
|
continue;
|
|
prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
|
|
if (!signal_pending(current)
|
|
&& mddev2->curr_resync >= mddev->curr_resync) {
|
|
printk(KERN_INFO "md: delaying resync of %s"
|
|
" until %s has finished resync (they"
|
|
" share one or more physical units)\n",
|
|
mdname(mddev), mdname(mddev2));
|
|
mddev_put(mddev2);
|
|
schedule();
|
|
finish_wait(&resync_wait, &wq);
|
|
goto try_again;
|
|
}
|
|
finish_wait(&resync_wait, &wq);
|
|
}
|
|
}
|
|
} while (mddev->curr_resync < 2);
|
|
|
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
|
|
/* resync follows the size requested by the personality,
|
|
* which default to physical size, but can be virtual size
|
|
*/
|
|
max_sectors = mddev->resync_max_sectors;
|
|
else
|
|
/* recovery follows the physical size of devices */
|
|
max_sectors = mddev->size << 1;
|
|
|
|
printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
|
|
printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
|
|
" %d KB/sec/disc.\n", sysctl_speed_limit_min);
|
|
printk(KERN_INFO "md: using maximum available idle IO bandwith "
|
|
"(but not more than %d KB/sec) for reconstruction.\n",
|
|
sysctl_speed_limit_max);
|
|
|
|
is_mddev_idle(mddev); /* this also initializes IO event counters */
|
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
|
|
j = mddev->recovery_cp;
|
|
else
|
|
j = 0;
|
|
for (m = 0; m < SYNC_MARKS; m++) {
|
|
mark[m] = jiffies;
|
|
mark_cnt[m] = j;
|
|
}
|
|
last_mark = 0;
|
|
mddev->resync_mark = mark[last_mark];
|
|
mddev->resync_mark_cnt = mark_cnt[last_mark];
|
|
|
|
/*
|
|
* Tune reconstruction:
|
|
*/
|
|
window = 32*(PAGE_SIZE/512);
|
|
printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
|
|
window/2,(unsigned long long) max_sectors/2);
|
|
|
|
atomic_set(&mddev->recovery_active, 0);
|
|
init_waitqueue_head(&mddev->recovery_wait);
|
|
last_check = 0;
|
|
|
|
if (j>2) {
|
|
printk(KERN_INFO
|
|
"md: resuming recovery of %s from checkpoint.\n",
|
|
mdname(mddev));
|
|
mddev->curr_resync = j;
|
|
}
|
|
|
|
while (j < max_sectors) {
|
|
int sectors;
|
|
|
|
sectors = mddev->pers->sync_request(mddev, j, currspeed < sysctl_speed_limit_min);
|
|
if (sectors < 0) {
|
|
set_bit(MD_RECOVERY_ERR, &mddev->recovery);
|
|
goto out;
|
|
}
|
|
atomic_add(sectors, &mddev->recovery_active);
|
|
j += sectors;
|
|
if (j>1) mddev->curr_resync = j;
|
|
|
|
if (last_check + window > j || j == max_sectors)
|
|
continue;
|
|
|
|
last_check = j;
|
|
|
|
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
|
|
test_bit(MD_RECOVERY_ERR, &mddev->recovery))
|
|
break;
|
|
|
|
repeat:
|
|
if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
|
|
/* step marks */
|
|
int next = (last_mark+1) % SYNC_MARKS;
|
|
|
|
mddev->resync_mark = mark[next];
|
|
mddev->resync_mark_cnt = mark_cnt[next];
|
|
mark[next] = jiffies;
|
|
mark_cnt[next] = j - atomic_read(&mddev->recovery_active);
|
|
last_mark = next;
|
|
}
|
|
|
|
|
|
if (signal_pending(current)) {
|
|
/*
|
|
* got a signal, exit.
|
|
*/
|
|
printk(KERN_INFO
|
|
"md: md_do_sync() got signal ... exiting\n");
|
|
flush_signals(current);
|
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* this loop exits only if either when we are slower than
|
|
* the 'hard' speed limit, or the system was IO-idle for
|
|
* a jiffy.
|
|
* the system might be non-idle CPU-wise, but we only care
|
|
* about not overloading the IO subsystem. (things like an
|
|
* e2fsck being done on the RAID array should execute fast)
|
|
*/
|
|
mddev->queue->unplug_fn(mddev->queue);
|
|
cond_resched();
|
|
|
|
currspeed = ((unsigned long)(j-mddev->resync_mark_cnt))/2/((jiffies-mddev->resync_mark)/HZ +1) +1;
|
|
|
|
if (currspeed > sysctl_speed_limit_min) {
|
|
if ((currspeed > sysctl_speed_limit_max) ||
|
|
!is_mddev_idle(mddev)) {
|
|
msleep_interruptible(250);
|
|
goto repeat;
|
|
}
|
|
}
|
|
}
|
|
printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
|
|
/*
|
|
* this also signals 'finished resyncing' to md_stop
|
|
*/
|
|
out:
|
|
mddev->queue->unplug_fn(mddev->queue);
|
|
|
|
wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
|
|
|
|
/* tell personality that we are finished */
|
|
mddev->pers->sync_request(mddev, max_sectors, 1);
|
|
|
|
if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
|
|
mddev->curr_resync > 2 &&
|
|
mddev->curr_resync >= mddev->recovery_cp) {
|
|
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
|
|
printk(KERN_INFO
|
|
"md: checkpointing recovery of %s.\n",
|
|
mdname(mddev));
|
|
mddev->recovery_cp = mddev->curr_resync;
|
|
} else
|
|
mddev->recovery_cp = MaxSector;
|
|
}
|
|
|
|
md_enter_safemode(mddev);
|
|
skip:
|
|
mddev->curr_resync = 0;
|
|
wake_up(&resync_wait);
|
|
set_bit(MD_RECOVERY_DONE, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
}
|
|
|
|
|
|
/*
|
|
* This routine is regularly called by all per-raid-array threads to
|
|
* deal with generic issues like resync and super-block update.
|
|
* Raid personalities that don't have a thread (linear/raid0) do not
|
|
* need this as they never do any recovery or update the superblock.
|
|
*
|
|
* It does not do any resync itself, but rather "forks" off other threads
|
|
* to do that as needed.
|
|
* When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
|
|
* "->recovery" and create a thread at ->sync_thread.
|
|
* When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
|
|
* and wakeups up this thread which will reap the thread and finish up.
|
|
* This thread also removes any faulty devices (with nr_pending == 0).
|
|
*
|
|
* The overall approach is:
|
|
* 1/ if the superblock needs updating, update it.
|
|
* 2/ If a recovery thread is running, don't do anything else.
|
|
* 3/ If recovery has finished, clean up, possibly marking spares active.
|
|
* 4/ If there are any faulty devices, remove them.
|
|
* 5/ If array is degraded, try to add spares devices
|
|
* 6/ If array has spares or is not in-sync, start a resync thread.
|
|
*/
|
|
void md_check_recovery(mddev_t *mddev)
|
|
{
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *rtmp;
|
|
|
|
|
|
dprintk(KERN_INFO "md: recovery thread got woken up ...\n");
|
|
|
|
if (mddev->ro)
|
|
return;
|
|
if ( ! (
|
|
mddev->sb_dirty ||
|
|
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
|
|
test_bit(MD_RECOVERY_DONE, &mddev->recovery)
|
|
))
|
|
return;
|
|
if (mddev_trylock(mddev)==0) {
|
|
int spares =0;
|
|
if (mddev->sb_dirty)
|
|
md_update_sb(mddev);
|
|
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
|
|
!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
|
|
/* resync/recovery still happening */
|
|
clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
goto unlock;
|
|
}
|
|
if (mddev->sync_thread) {
|
|
/* resync has finished, collect result */
|
|
md_unregister_thread(mddev->sync_thread);
|
|
mddev->sync_thread = NULL;
|
|
if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
|
|
!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
|
|
/* success...*/
|
|
/* activate any spares */
|
|
mddev->pers->spare_active(mddev);
|
|
}
|
|
md_update_sb(mddev);
|
|
mddev->recovery = 0;
|
|
/* flag recovery needed just to double check */
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
goto unlock;
|
|
}
|
|
if (mddev->recovery)
|
|
/* probably just the RECOVERY_NEEDED flag */
|
|
mddev->recovery = 0;
|
|
|
|
/* no recovery is running.
|
|
* remove any failed drives, then
|
|
* add spares if possible.
|
|
* Spare are also removed and re-added, to allow
|
|
* the personality to fail the re-add.
|
|
*/
|
|
ITERATE_RDEV(mddev,rdev,rtmp)
|
|
if (rdev->raid_disk >= 0 &&
|
|
(rdev->faulty || ! rdev->in_sync) &&
|
|
atomic_read(&rdev->nr_pending)==0) {
|
|
if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0)
|
|
rdev->raid_disk = -1;
|
|
}
|
|
|
|
if (mddev->degraded) {
|
|
ITERATE_RDEV(mddev,rdev,rtmp)
|
|
if (rdev->raid_disk < 0
|
|
&& !rdev->faulty) {
|
|
if (mddev->pers->hot_add_disk(mddev,rdev))
|
|
spares++;
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!spares && (mddev->recovery_cp == MaxSector )) {
|
|
/* nothing we can do ... */
|
|
goto unlock;
|
|
}
|
|
if (mddev->pers->sync_request) {
|
|
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
|
|
if (!spares)
|
|
set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
|
|
mddev->sync_thread = md_register_thread(md_do_sync,
|
|
mddev,
|
|
"%s_resync");
|
|
if (!mddev->sync_thread) {
|
|
printk(KERN_ERR "%s: could not start resync"
|
|
" thread...\n",
|
|
mdname(mddev));
|
|
/* leave the spares where they are, it shouldn't hurt */
|
|
mddev->recovery = 0;
|
|
} else {
|
|
md_wakeup_thread(mddev->sync_thread);
|
|
}
|
|
}
|
|
unlock:
|
|
mddev_unlock(mddev);
|
|
}
|
|
}
|
|
|
|
int md_notify_reboot(struct notifier_block *this,
|
|
unsigned long code, void *x)
|
|
{
|
|
struct list_head *tmp;
|
|
mddev_t *mddev;
|
|
|
|
if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
|
|
|
|
printk(KERN_INFO "md: stopping all md devices.\n");
|
|
|
|
ITERATE_MDDEV(mddev,tmp)
|
|
if (mddev_trylock(mddev)==0)
|
|
do_md_stop (mddev, 1);
|
|
/*
|
|
* certain more exotic SCSI devices are known to be
|
|
* volatile wrt too early system reboots. While the
|
|
* right place to handle this issue is the given
|
|
* driver, we do want to have a safe RAID driver ...
|
|
*/
|
|
mdelay(1000*1);
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
struct notifier_block md_notifier = {
|
|
.notifier_call = md_notify_reboot,
|
|
.next = NULL,
|
|
.priority = INT_MAX, /* before any real devices */
|
|
};
|
|
|
|
static void md_geninit(void)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
|
|
dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
|
|
|
|
p = create_proc_entry("mdstat", S_IRUGO, NULL);
|
|
if (p)
|
|
p->proc_fops = &md_seq_fops;
|
|
}
|
|
|
|
int __init md_init(void)
|
|
{
|
|
int minor;
|
|
|
|
printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
|
|
" MD_SB_DISKS=%d\n",
|
|
MD_MAJOR_VERSION, MD_MINOR_VERSION,
|
|
MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
|
|
|
|
if (register_blkdev(MAJOR_NR, "md"))
|
|
return -1;
|
|
if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
|
|
unregister_blkdev(MAJOR_NR, "md");
|
|
return -1;
|
|
}
|
|
devfs_mk_dir("md");
|
|
blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
|
|
md_probe, NULL, NULL);
|
|
blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
|
|
md_probe, NULL, NULL);
|
|
|
|
for (minor=0; minor < MAX_MD_DEVS; ++minor)
|
|
devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
|
|
S_IFBLK|S_IRUSR|S_IWUSR,
|
|
"md/%d", minor);
|
|
|
|
for (minor=0; minor < MAX_MD_DEVS; ++minor)
|
|
devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
|
|
S_IFBLK|S_IRUSR|S_IWUSR,
|
|
"md/mdp%d", minor);
|
|
|
|
|
|
register_reboot_notifier(&md_notifier);
|
|
raid_table_header = register_sysctl_table(raid_root_table, 1);
|
|
|
|
md_geninit();
|
|
return (0);
|
|
}
|
|
|
|
|
|
#ifndef MODULE
|
|
|
|
/*
|
|
* Searches all registered partitions for autorun RAID arrays
|
|
* at boot time.
|
|
*/
|
|
static dev_t detected_devices[128];
|
|
static int dev_cnt;
|
|
|
|
void md_autodetect_dev(dev_t dev)
|
|
{
|
|
if (dev_cnt >= 0 && dev_cnt < 127)
|
|
detected_devices[dev_cnt++] = dev;
|
|
}
|
|
|
|
|
|
static void autostart_arrays(int part)
|
|
{
|
|
mdk_rdev_t *rdev;
|
|
int i;
|
|
|
|
printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
|
|
|
|
for (i = 0; i < dev_cnt; i++) {
|
|
dev_t dev = detected_devices[i];
|
|
|
|
rdev = md_import_device(dev,0, 0);
|
|
if (IS_ERR(rdev))
|
|
continue;
|
|
|
|
if (rdev->faulty) {
|
|
MD_BUG();
|
|
continue;
|
|
}
|
|
list_add(&rdev->same_set, &pending_raid_disks);
|
|
}
|
|
dev_cnt = 0;
|
|
|
|
autorun_devices(part);
|
|
}
|
|
|
|
#endif
|
|
|
|
static __exit void md_exit(void)
|
|
{
|
|
mddev_t *mddev;
|
|
struct list_head *tmp;
|
|
int i;
|
|
blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
|
|
blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
|
|
for (i=0; i < MAX_MD_DEVS; i++)
|
|
devfs_remove("md/%d", i);
|
|
for (i=0; i < MAX_MD_DEVS; i++)
|
|
devfs_remove("md/d%d", i);
|
|
|
|
devfs_remove("md");
|
|
|
|
unregister_blkdev(MAJOR_NR,"md");
|
|
unregister_blkdev(mdp_major, "mdp");
|
|
unregister_reboot_notifier(&md_notifier);
|
|
unregister_sysctl_table(raid_table_header);
|
|
remove_proc_entry("mdstat", NULL);
|
|
ITERATE_MDDEV(mddev,tmp) {
|
|
struct gendisk *disk = mddev->gendisk;
|
|
if (!disk)
|
|
continue;
|
|
export_array(mddev);
|
|
del_gendisk(disk);
|
|
put_disk(disk);
|
|
mddev->gendisk = NULL;
|
|
mddev_put(mddev);
|
|
}
|
|
}
|
|
|
|
module_init(md_init)
|
|
module_exit(md_exit)
|
|
|
|
EXPORT_SYMBOL(register_md_personality);
|
|
EXPORT_SYMBOL(unregister_md_personality);
|
|
EXPORT_SYMBOL(md_error);
|
|
EXPORT_SYMBOL(md_done_sync);
|
|
EXPORT_SYMBOL(md_write_start);
|
|
EXPORT_SYMBOL(md_write_end);
|
|
EXPORT_SYMBOL(md_handle_safemode);
|
|
EXPORT_SYMBOL(md_register_thread);
|
|
EXPORT_SYMBOL(md_unregister_thread);
|
|
EXPORT_SYMBOL(md_wakeup_thread);
|
|
EXPORT_SYMBOL(md_print_devices);
|
|
EXPORT_SYMBOL(md_check_recovery);
|
|
MODULE_LICENSE("GPL");
|