md.c 108.8 KB
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/*
   md.c : Multiple Devices driver for Linux
	  Copyright (C) 1998, 1999, 2000 Ingo Molnar

     completely rewritten, based on the MD driver code from Marc Zyngier

   Changes:

   - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
   - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
   - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
   - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
   - kmod support by: Cyrus Durgin
   - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
   - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>

   - lots of fixes and improvements to the RAID1/RAID5 and generic
     RAID code (such as request based resynchronization):

     Neil Brown <neilb@cse.unsw.edu.au>.

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   - persistent bitmap code
     Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.

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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   You should have received a copy of the GNU General Public License
   (for example /usr/src/linux/COPYING); if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/module.h>
#include <linux/config.h>
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#include <linux/kthread.h>
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#include <linux/linkage.h>
#include <linux/raid/md.h>
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#include <linux/raid/bitmap.h>
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#include <linux/sysctl.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/buffer_head.h> /* for invalidate_bdev */
#include <linux/suspend.h>

#include <linux/init.h>

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#include <linux/file.h>

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#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif

#include <asm/unaligned.h>

#define MAJOR_NR MD_MAJOR
#define MD_DRIVER

/* 63 partitions with the alternate major number (mdp) */
#define MdpMinorShift 6

#define DEBUG 0
#define dprintk(x...) ((void)(DEBUG && printk(x)))


#ifndef MODULE
static void autostart_arrays (int part);
#endif

static mdk_personality_t *pers[MAX_PERSONALITY];
static DEFINE_SPINLOCK(pers_lock);

/*
 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
 * is 1000 KB/sec, so the extra system load does not show up that much.
 * Increase it if you want to have more _guaranteed_ speed. Note that
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 * the RAID driver will use the maximum available bandwidth if the IO
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 * subsystem is idle. There is also an 'absolute maximum' reconstruction
 * speed limit - in case reconstruction slows down your system despite
 * idle IO detection.
 *
 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
 */

static int sysctl_speed_limit_min = 1000;
static int sysctl_speed_limit_max = 200000;

static struct ctl_table_header *raid_table_header;

static ctl_table raid_table[] = {
	{
		.ctl_name	= DEV_RAID_SPEED_LIMIT_MIN,
		.procname	= "speed_limit_min",
		.data		= &sysctl_speed_limit_min,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= DEV_RAID_SPEED_LIMIT_MAX,
		.procname	= "speed_limit_max",
		.data		= &sysctl_speed_limit_max,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{ .ctl_name = 0 }
};

static ctl_table raid_dir_table[] = {
	{
		.ctl_name	= DEV_RAID,
		.procname	= "raid",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= raid_table,
	},
	{ .ctl_name = 0 }
};

static ctl_table raid_root_table[] = {
	{
		.ctl_name	= CTL_DEV,
		.procname	= "dev",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= raid_dir_table,
	},
	{ .ctl_name = 0 }
};

static struct block_device_operations md_fops;

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static int start_readonly;

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/*
 * Enables to iterate over all existing md arrays
 * all_mddevs_lock protects this list.
 */
static LIST_HEAD(all_mddevs);
static DEFINE_SPINLOCK(all_mddevs_lock);


/*
 * iterates through all used mddevs in the system.
 * We take care to grab the all_mddevs_lock whenever navigating
 * the list, and to always hold a refcount when unlocked.
 * Any code which breaks out of this loop while own
 * a reference to the current mddev and must mddev_put it.
 */
#define ITERATE_MDDEV(mddev,tmp)					\
									\
	for (({ spin_lock(&all_mddevs_lock); 				\
		tmp = all_mddevs.next;					\
		mddev = NULL;});					\
	     ({ if (tmp != &all_mddevs)					\
			mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
		spin_unlock(&all_mddevs_lock);				\
		if (mddev) mddev_put(mddev);				\
		mddev = list_entry(tmp, mddev_t, all_mddevs);		\
		tmp != &all_mddevs;});					\
	     ({ spin_lock(&all_mddevs_lock);				\
		tmp = tmp->next;})					\
		)


static int md_fail_request (request_queue_t *q, struct bio *bio)
{
	bio_io_error(bio, bio->bi_size);
	return 0;
}

static inline mddev_t *mddev_get(mddev_t *mddev)
{
	atomic_inc(&mddev->active);
	return mddev;
}

static void mddev_put(mddev_t *mddev)
{
	if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
		return;
	if (!mddev->raid_disks && list_empty(&mddev->disks)) {
		list_del(&mddev->all_mddevs);
		blk_put_queue(mddev->queue);
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		kobject_unregister(&mddev->kobj);
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	}
	spin_unlock(&all_mddevs_lock);
}

static mddev_t * mddev_find(dev_t unit)
{
	mddev_t *mddev, *new = NULL;

 retry:
	spin_lock(&all_mddevs_lock);
	list_for_each_entry(mddev, &all_mddevs, all_mddevs)
		if (mddev->unit == unit) {
			mddev_get(mddev);
			spin_unlock(&all_mddevs_lock);
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			kfree(new);
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			return mddev;
		}

	if (new) {
		list_add(&new->all_mddevs, &all_mddevs);
		spin_unlock(&all_mddevs_lock);
		return new;
	}
	spin_unlock(&all_mddevs_lock);

	new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL);
	if (!new)
		return NULL;

	memset(new, 0, sizeof(*new));

	new->unit = unit;
	if (MAJOR(unit) == MD_MAJOR)
		new->md_minor = MINOR(unit);
	else
		new->md_minor = MINOR(unit) >> MdpMinorShift;

	init_MUTEX(&new->reconfig_sem);
	INIT_LIST_HEAD(&new->disks);
	INIT_LIST_HEAD(&new->all_mddevs);
	init_timer(&new->safemode_timer);
	atomic_set(&new->active, 1);
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	spin_lock_init(&new->write_lock);
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	init_waitqueue_head(&new->sb_wait);
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	new->queue = blk_alloc_queue(GFP_KERNEL);
	if (!new->queue) {
		kfree(new);
		return NULL;
	}

	blk_queue_make_request(new->queue, md_fail_request);

	goto retry;
}

static inline int mddev_lock(mddev_t * mddev)
{
	return down_interruptible(&mddev->reconfig_sem);
}

static inline void mddev_lock_uninterruptible(mddev_t * mddev)
{
	down(&mddev->reconfig_sem);
}

static inline int mddev_trylock(mddev_t * mddev)
{
	return down_trylock(&mddev->reconfig_sem);
}

static inline void mddev_unlock(mddev_t * mddev)
{
	up(&mddev->reconfig_sem);

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	md_wakeup_thread(mddev->thread);
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}

mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
{
	mdk_rdev_t * rdev;
	struct list_head *tmp;

	ITERATE_RDEV(mddev,rdev,tmp) {
		if (rdev->desc_nr == nr)
			return rdev;
	}
	return NULL;
}

static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
{
	struct list_head *tmp;
	mdk_rdev_t *rdev;

	ITERATE_RDEV(mddev,rdev,tmp) {
		if (rdev->bdev->bd_dev == dev)
			return rdev;
	}
	return NULL;
}

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static inline sector_t calc_dev_sboffset(struct block_device *bdev)
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{
	sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
	return MD_NEW_SIZE_BLOCKS(size);
}

static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
{
	sector_t size;

	size = rdev->sb_offset;

	if (chunk_size)
		size &= ~((sector_t)chunk_size/1024 - 1);
	return size;
}

static int alloc_disk_sb(mdk_rdev_t * rdev)
{
	if (rdev->sb_page)
		MD_BUG();

	rdev->sb_page = alloc_page(GFP_KERNEL);
	if (!rdev->sb_page) {
		printk(KERN_ALERT "md: out of memory.\n");
		return -EINVAL;
	}

	return 0;
}

static void free_disk_sb(mdk_rdev_t * rdev)
{
	if (rdev->sb_page) {
		page_cache_release(rdev->sb_page);
		rdev->sb_loaded = 0;
		rdev->sb_page = NULL;
		rdev->sb_offset = 0;
		rdev->size = 0;
	}
}


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static int super_written(struct bio *bio, unsigned int bytes_done, int error)
{
	mdk_rdev_t *rdev = bio->bi_private;
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	mddev_t *mddev = rdev->mddev;
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	if (bio->bi_size)
		return 1;

	if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
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		md_error(mddev, rdev);
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	if (atomic_dec_and_test(&mddev->pending_writes))
		wake_up(&mddev->sb_wait);
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	bio_put(bio);
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	return 0;
}

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static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
{
	struct bio *bio2 = bio->bi_private;
	mdk_rdev_t *rdev = bio2->bi_private;
	mddev_t *mddev = rdev->mddev;
	if (bio->bi_size)
		return 1;

	if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
	    error == -EOPNOTSUPP) {
		unsigned long flags;
		/* barriers don't appear to be supported :-( */
		set_bit(BarriersNotsupp, &rdev->flags);
		mddev->barriers_work = 0;
		spin_lock_irqsave(&mddev->write_lock, flags);
		bio2->bi_next = mddev->biolist;
		mddev->biolist = bio2;
		spin_unlock_irqrestore(&mddev->write_lock, flags);
		wake_up(&mddev->sb_wait);
		bio_put(bio);
		return 0;
	}
	bio_put(bio2);
	bio->bi_private = rdev;
	return super_written(bio, bytes_done, error);
}

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void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
		   sector_t sector, int size, struct page *page)
{
	/* write first size bytes of page to sector of rdev
	 * Increment mddev->pending_writes before returning
	 * and decrement it on completion, waking up sb_wait
	 * if zero is reached.
	 * If an error occurred, call md_error
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	 *
	 * As we might need to resubmit the request if BIO_RW_BARRIER
	 * causes ENOTSUPP, we allocate a spare bio...
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	 */
	struct bio *bio = bio_alloc(GFP_NOIO, 1);
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	int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
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	bio->bi_bdev = rdev->bdev;
	bio->bi_sector = sector;
	bio_add_page(bio, page, size, 0);
	bio->bi_private = rdev;
	bio->bi_end_io = super_written;
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	bio->bi_rw = rw;

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	atomic_inc(&mddev->pending_writes);
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	if (!test_bit(BarriersNotsupp, &rdev->flags)) {
		struct bio *rbio;
		rw |= (1<<BIO_RW_BARRIER);
		rbio = bio_clone(bio, GFP_NOIO);
		rbio->bi_private = bio;
		rbio->bi_end_io = super_written_barrier;
		submit_bio(rw, rbio);
	} else
		submit_bio(rw, bio);
}

void md_super_wait(mddev_t *mddev)
{
	/* wait for all superblock writes that were scheduled to complete.
	 * if any had to be retried (due to BARRIER problems), retry them
	 */
	DEFINE_WAIT(wq);
	for(;;) {
		prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
		if (atomic_read(&mddev->pending_writes)==0)
			break;
		while (mddev->biolist) {
			struct bio *bio;
			spin_lock_irq(&mddev->write_lock);
			bio = mddev->biolist;
			mddev->biolist = bio->bi_next ;
			bio->bi_next = NULL;
			spin_unlock_irq(&mddev->write_lock);
			submit_bio(bio->bi_rw, bio);
		}
		schedule();
	}
	finish_wait(&mddev->sb_wait, &wq);
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}

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static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
{
	if (bio->bi_size)
		return 1;

	complete((struct completion*)bio->bi_private);
	return 0;
}

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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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	struct bio *bio = bio_alloc(GFP_NOIO, 1);
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	struct completion event;
	int ret;

	rw |= (1 << BIO_RW_SYNC);

	bio->bi_bdev = bdev;
	bio->bi_sector = sector;
	bio_add_page(bio, page, size, 0);
	init_completion(&event);
	bio->bi_private = &event;
	bio->bi_end_io = bi_complete;
	submit_bio(rw, bio);
	wait_for_completion(&event);

	ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
	bio_put(bio);
	return ret;
}

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static int read_disk_sb(mdk_rdev_t * rdev, int size)
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{
	char b[BDEVNAME_SIZE];
	if (!rdev->sb_page) {
		MD_BUG();
		return -EINVAL;
	}
	if (rdev->sb_loaded)
		return 0;


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	if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
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		goto fail;
	rdev->sb_loaded = 1;
	return 0;

fail:
	printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
		bdevname(rdev->bdev,b));
	return -EINVAL;
}

static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
{
	if (	(sb1->set_uuid0 == sb2->set_uuid0) &&
		(sb1->set_uuid1 == sb2->set_uuid1) &&
		(sb1->set_uuid2 == sb2->set_uuid2) &&
		(sb1->set_uuid3 == sb2->set_uuid3))

		return 1;

	return 0;
}


static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
{
	int ret;
	mdp_super_t *tmp1, *tmp2;

	tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
	tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);

	if (!tmp1 || !tmp2) {
		ret = 0;
		printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
		goto abort;
	}

	*tmp1 = *sb1;
	*tmp2 = *sb2;

	/*
	 * nr_disks is not constant
	 */
	tmp1->nr_disks = 0;
	tmp2->nr_disks = 0;

	if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
		ret = 0;
	else
		ret = 1;

abort:
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	kfree(tmp1);
	kfree(tmp2);
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	return ret;
}

static unsigned int calc_sb_csum(mdp_super_t * sb)
{
	unsigned int disk_csum, csum;

	disk_csum = sb->sb_csum;
	sb->sb_csum = 0;
	csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
	sb->sb_csum = disk_csum;
	return csum;
}


/*
 * Handle superblock details.
 * We want to be able to handle multiple superblock formats
 * so we have a common interface to them all, and an array of
 * different handlers.
 * We rely on user-space to write the initial superblock, and support
 * reading and updating of superblocks.
 * Interface methods are:
 *   int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
 *      loads and validates a superblock on dev.
 *      if refdev != NULL, compare superblocks on both devices
 *    Return:
 *      0 - dev has a superblock that is compatible with refdev
 *      1 - dev has a superblock that is compatible and newer than refdev
 *          so dev should be used as the refdev in future
 *     -EINVAL superblock incompatible or invalid
 *     -othererror e.g. -EIO
 *
 *   int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
 *      Verify that dev is acceptable into mddev.
 *       The first time, mddev->raid_disks will be 0, and data from
 *       dev should be merged in.  Subsequent calls check that dev
 *       is new enough.  Return 0 or -EINVAL
 *
 *   void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
 *     Update the superblock for rdev with data in mddev
 *     This does not write to disc.
 *
 */

struct super_type  {
	char 		*name;
	struct module	*owner;
	int		(*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
	int		(*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
	void		(*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
};

/*
 * load_super for 0.90.0 
 */
static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
{
	char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
	mdp_super_t *sb;
	int ret;
	sector_t sb_offset;

	/*
	 * Calculate the position of the superblock,
	 * it's at the end of the disk.
	 *
	 * It also happens to be a multiple of 4Kb.
	 */
	sb_offset = calc_dev_sboffset(rdev->bdev);
	rdev->sb_offset = sb_offset;

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	ret = read_disk_sb(rdev, MD_SB_BYTES);
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	if (ret) return ret;

	ret = -EINVAL;

	bdevname(rdev->bdev, b);
	sb = (mdp_super_t*)page_address(rdev->sb_page);

	if (sb->md_magic != MD_SB_MAGIC) {
		printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
		       b);
		goto abort;
	}

	if (sb->major_version != 0 ||
	    sb->minor_version != 90) {
		printk(KERN_WARNING "Bad version number %d.%d on %s\n",
			sb->major_version, sb->minor_version,
			b);
		goto abort;
	}

	if (sb->raid_disks <= 0)
		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;
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	rdev->sb_size = MD_SB_BYTES;
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	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);

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	rdev->raid_disk = -1;
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	rdev->flags = 0;
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	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);
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		mddev->bitmap_offset = 0;
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		mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
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		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;
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		if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
		    mddev->bitmap_file == NULL) {
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			if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6) {
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				/* FIXME use a better test */
				printk(KERN_WARNING "md: bitmaps only support for raid1\n");
				return -EINVAL;
			}
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			mddev->bitmap_offset = mddev->default_bitmap_offset;
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		}

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	} else if (mddev->pers == NULL) {
		/* Insist on good event counter while assembling */
		__u64 ev1 = md_event(sb);
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		++ev1;
		if (ev1 < mddev->events) 
			return -EINVAL;
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	} else if (mddev->bitmap) {
		/* if adding to array with a bitmap, then we can accept an
		 * older device ... but not too old.
		 */
		__u64 ev1 = md_event(sb);
		if (ev1 < mddev->bitmap->events_cleared)
			return 0;
	} else /* just a hot-add of a new device, leave raid_disk at -1 */
		return 0;

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	if (mddev->level != LEVEL_MULTIPATH) {
		desc = sb->disks + rdev->desc_nr;

		if (desc->state & (1<<MD_DISK_FAULTY))
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			set_bit(Faulty, &rdev->flags);
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		else if (desc->state & (1<<MD_DISK_SYNC) &&
			 desc->raid_disk < mddev->raid_disks) {
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			set_bit(In_sync, &rdev->flags);
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			rdev->raid_disk = desc->raid_disk;
		}
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		if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
			set_bit(WriteMostly, &rdev->flags);
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	} else /* MULTIPATH are always insync */
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		set_bit(In_sync, &rdev->flags);
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	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;
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	/* 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;

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	rdev->sb_size = MD_SB_BYTES;

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	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;

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	if (mddev->bitmap && mddev->bitmap_file == NULL)
		sb->state |= (1<<MD_SB_BITMAP_PRESENT);

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	sb->disks[0].state = (1<<MD_DISK_REMOVED);
	ITERATE_RDEV(mddev,rdev2,tmp) {
		mdp_disk_t *d;
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		int desc_nr;
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		if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
		    && !test_bit(Faulty, &rdev2->flags))
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			desc_nr = rdev2->raid_disk;
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		else
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			desc_nr = next_spare++;
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		rdev2->desc_nr = desc_nr;
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		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);
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		if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
		    && !test_bit(Faulty, &rdev2->flags))
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			d->raid_disk = rdev2->raid_disk;
		else
			d->raid_disk = rdev2->desc_nr; /* compatibility */
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		if (test_bit(Faulty, &rdev2->flags)) {
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			d->state = (1<<MD_DISK_FAULTY);
			failed++;
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		} else if (test_bit(In_sync, &rdev2->flags)) {
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			d->state = (1<<MD_DISK_ACTIVE);
			d->state |= (1<<MD_DISK_SYNC);
			active++;
			working++;
		} else {
			d->state = 0;
			spare++;
			working++;
		}
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		if (test_bit(WriteMostly, &rdev2->flags))
			d->state |= (1<<MD_DISK_WRITEMOSTLY);
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	}
	/* 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];
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	int bmask;
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	/*
	 * 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;
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		sb_offset &= ~(sector_t)(4*2-1);
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		/* 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;

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	/* superblock is rarely larger than 1K, but it can be larger,
	 * and it is safe to read 4k, so we do that
	 */
	ret = read_disk_sb(rdev, 4096);
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	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) ||
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	    (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
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		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);

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	rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
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	bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
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	if (rdev->sb_size & bmask)
		rdev-> sb_size = (rdev->sb_size | bmask)+1;

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	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);

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	rdev->raid_disk = -1;
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	rdev->flags = 0;
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	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);
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		mddev->bitmap_offset = 0;
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		mddev->default_bitmap_offset = 0;
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		mddev->default_bitmap_offset = 1024;
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		mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
		memcpy(mddev->uuid, sb->set_uuid, 16);

		mddev->max_disks =  (4096-256)/2;
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		if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
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		    mddev->bitmap_file == NULL ) {
			if (mddev->level != 1) {
				printk(KERN_WARNING "md: bitmaps only supported for raid1\n");
				return -EINVAL;
			}
			mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
		}
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	} else if (mddev->pers == NULL) {
		/* Insist of good event counter while assembling */
		__u64 ev1 = le64_to_cpu(sb->events);
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		++ev1;
		if (ev1 < mddev->events)
			return -EINVAL;
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	} else if (mddev->bitmap) {
		/* If adding to array with a bitmap, then we can accept an
		 * older device, but not too old.
		 */
		__u64 ev1 = le64_to_cpu(sb->events);
		if (ev1 < mddev->bitmap->events_cleared)
			return 0;
	} else /* just a hot-add of a new device, leave raid_disk at -1 */
		return 0;
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	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 */
			break;
		case 0xfffe: /* faulty */
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			set_bit(Faulty, &rdev->flags);
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			break;
		default:
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			set_bit(In_sync, &rdev->flags);
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			rdev->raid_disk = role;
			break;
		}
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		if (sb->devflags & WriteMostly1)
			set_bit(WriteMostly, &rdev->flags);
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	} else /* MULTIPATH are always insync */
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		set_bit(In_sync, &rdev->flags);
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	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);

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	if (mddev->bitmap && mddev->bitmap_file == NULL) {
		sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
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		sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
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	}

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	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;
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		if (test_bit(Faulty, &rdev2->flags))
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			sb->dev_roles[i] = cpu_to_le16(0xfffe);
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		else if (test_bit(In_sync, &rdev2->flags))
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			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);
}


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static struct super_type super_types[] = {
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	[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];
1185
	struct kobject *ko;
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	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;
	}
1214 1215 1216
	bdevname(rdev->bdev,b);
	if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
		return -ENOMEM;
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	list_add(&rdev->same_set, &mddev->disks);
	rdev->mddev = mddev;
1220
	printk(KERN_INFO "md: bind<%s>\n", b);
1221

1222
	rdev->kobj.parent = &mddev->kobj;
1223 1224
	kobject_add(&rdev->kobj);

1225 1226 1227 1228 1229
	if (rdev->bdev->bd_part)
		ko = &rdev->bdev->bd_part->kobj;
	else
		ko = &rdev->bdev->bd_disk->kobj;
	sysfs_create_link(&rdev->kobj, ko, "block");
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	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;
1243 1244
	sysfs_remove_link(&rdev->kobj, "block");
	kobject_del(&rdev->kobj);
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}

/*
 * 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);
1300
	kobject_put(&rdev->kobj);
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}

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,
1372 1373
	        test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
	        rdev->desc_nr);
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	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) {

1394 1395 1396 1397
		if (mddev->bitmap)
			bitmap_print_sb(mddev->bitmap);
		else
			printk("%s: ", mdname(mddev));
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		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 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)
{
1424
	int err;
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	struct list_head *tmp;
	mdk_rdev_t *rdev;
1427
	int sync_req;
L
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repeat:
1430
	spin_lock_irq(&mddev->write_lock);
1431
	sync_req = mddev->in_sync;
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	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 --;
	}
1444
	mddev->sb_dirty = 2;
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	sync_sbs(mddev);

	/*
	 * do not write anything to disk if using
	 * nonpersistent superblocks
	 */
1451 1452
	if (!mddev->persistent) {
		mddev->sb_dirty = 0;
1453
		spin_unlock_irq(&mddev->write_lock);
1454
		wake_up(&mddev->sb_wait);
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		return;
1456
	}
1457
	spin_unlock_irq(&mddev->write_lock);
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	dprintk(KERN_INFO 
		"md: updating %s RAID superblock on device (in sync %d)\n",
		mdname(mddev),mddev->in_sync);

1463
	err = bitmap_update_sb(mddev->bitmap);
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	ITERATE_RDEV(mddev,rdev,tmp) {
		char b[BDEVNAME_SIZE];
		dprintk(KERN_INFO "md: ");
1467
		if (test_bit(Faulty, &rdev->flags))
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			dprintk("(skipping faulty ");

		dprintk("%s ", bdevname(rdev->bdev,b));
1471
		if (!test_bit(Faulty, &rdev->flags)) {
1472
			md_super_write(mddev,rdev,
1473
				       rdev->sb_offset<<1, rdev->sb_size,
1474 1475 1476 1477 1478
				       rdev->sb_page);
			dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
				bdevname(rdev->bdev,b),
				(unsigned long long)rdev->sb_offset);

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		} else
			dprintk(")\n");
1481
		if (mddev->level == LEVEL_MULTIPATH)
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			/* only need to write one superblock... */
			break;
	}
1485
	md_super_wait(mddev);
1486 1487
	/* if there was a failure, sb_dirty was set to 1, and we re-write super */

1488
	spin_lock_irq(&mddev->write_lock);
1489
	if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
1490
		/* have to write it out again */
1491
		spin_unlock_irq(&mddev->write_lock);
1492 1493 1494
		goto repeat;
	}
	mddev->sb_dirty = 0;
1495
	spin_unlock_irq(&mddev->write_lock);
1496
	wake_up(&mddev->sb_wait);
1497

L
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}

1500 1501 1502 1503 1504 1505 1506
struct rdev_sysfs_entry {
	struct attribute attr;
	ssize_t (*show)(mdk_rdev_t *, char *);
	ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
};

static ssize_t
1507
state_show(mdk_rdev_t *rdev, char *page)
1508 1509 1510 1511
{
	char *sep = "";
	int len=0;

1512
	if (test_bit(Faulty, &rdev->flags)) {
1513 1514 1515
		len+= sprintf(page+len, "%sfaulty",sep);
		sep = ",";
	}
1516
	if (test_bit(In_sync, &rdev->flags)) {
1517 1518 1519
		len += sprintf(page+len, "%sin_sync",sep);
		sep = ",";
	}
1520 1521
	if (!test_bit(Faulty, &rdev->flags) &&
	    !test_bit(In_sync, &rdev->flags)) {
1522 1523 1524 1525 1526 1527
		len += sprintf(page+len, "%sspare", sep);
		sep = ",";
	}
	return len+sprintf(page+len, "\n");
}

1528 1529
static struct rdev_sysfs_entry
rdev_state = __ATTR_RO(state);
1530 1531

static ssize_t
1532
super_show(mdk_rdev_t *rdev, char *page)
1533 1534 1535 1536 1537 1538 1539
{
	if (rdev->sb_loaded && rdev->sb_size) {
		memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
		return rdev->sb_size;
	} else
		return 0;
}
1540 1541
static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);

1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584
static struct attribute *rdev_default_attrs[] = {
	&rdev_state.attr,
	&rdev_super.attr,
	NULL,
};
static ssize_t
rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
	struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
	mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);

	if (!entry->show)
		return -EIO;
	return entry->show(rdev, page);
}

static ssize_t
rdev_attr_store(struct kobject *kobj, struct attribute *attr,
	      const char *page, size_t length)
{
	struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
	mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);

	if (!entry->store)
		return -EIO;
	return entry->store(rdev, page, length);
}

static void rdev_free(struct kobject *ko)
{
	mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
	kfree(rdev);
}
static struct sysfs_ops rdev_sysfs_ops = {
	.show		= rdev_attr_show,
	.store		= rdev_attr_store,
};
static struct kobj_type rdev_ktype = {
	.release	= rdev_free,
	.sysfs_ops	= &rdev_sysfs_ops,
	.default_attrs	= rdev_default_attrs,
};

L
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/*
 * 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;

1616 1617 1618 1619
	rdev->kobj.parent = NULL;
	rdev->kobj.ktype = &rdev_ktype;
	kobject_init(&rdev->kobj);

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	rdev->desc_nr = -1;
1621
	rdev->flags = 0;
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	rdev->data_offset = 0;
	atomic_set(&rdev->nr_pending, 0);
1624
	atomic_set(&rdev->read_errors, 0);
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	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
 */


1670
static void analyze_sbs(mddev_t * mddev)
L
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{
	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;
1712
			set_bit(In_sync, &rdev->flags);
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		}
	}



	if (mddev->recovery_cp != MaxSector &&
	    mddev->level >= 1)
		printk(KERN_ERR "md: %s: raid array is not clean"
		       " -- starting background reconstruction\n",
		       mdname(mddev));

}

1726
static ssize_t
1727
level_show(mddev_t *mddev, char *page)
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737
{
	mdk_personality_t *p = mddev->pers;
	if (p == NULL)
		return 0;
	if (mddev->level >= 0)
		return sprintf(page, "RAID-%d\n", mddev->level);
	else
		return sprintf(page, "%s\n", p->name);
}

1738
static struct md_sysfs_entry md_level = __ATTR_RO(level);
1739 1740

static ssize_t
1741
raid_disks_show(mddev_t *mddev, char *page)
1742 1743 1744 1745
{
	return sprintf(page, "%d\n", mddev->raid_disks);
}

1746
static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks);
1747

1748
static ssize_t
1749
action_show(mddev_t *mddev, char *page)
1750
{
1751
	char *type = "idle";
N
NeilBrown 已提交
1752 1753 1754
	if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
	    test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
		if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767
			if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
				type = "resync";
			else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
				type = "check";
			else
				type = "repair";
		} else
			type = "recover";
	}
	return sprintf(page, "%s\n", type);
}

static ssize_t
1768
action_store(mddev_t *mddev, const char *page, size_t len)
1769
{
1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781
	if (!mddev->pers || !mddev->pers->sync_request)
		return -EINVAL;

	if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) {
		if (mddev->sync_thread) {
			set_bit(MD_RECOVERY_INTR, &mddev->recovery);
			md_unregister_thread(mddev->sync_thread);
			mddev->sync_thread = NULL;
			mddev->recovery = 0;
		}
		return len;
	}
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	if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
	    test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
1785
		return -EBUSY;
1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797
	if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 ||
	    strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0)
		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
	else {
		if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
			set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
		else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
			return -EINVAL;
		set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
		set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
	}
1798 1799 1800 1801
	md_wakeup_thread(mddev->thread);
	return len;
}

1802
static ssize_t
1803
mismatch_cnt_show(mddev_t *mddev, char *page)
1804 1805 1806 1807 1808
{
	return sprintf(page, "%llu\n",
		       (unsigned long long) mddev->resync_mismatches);
}

1809
static struct md_sysfs_entry
1810
md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
1811

1812 1813 1814

static struct md_sysfs_entry
md_mismatches = __ATTR_RO(mismatch_cnt);
1815

1816 1817 1818
static struct attribute *md_default_attrs[] = {
	&md_level.attr,
	&md_raid_disks.attr,
1819 1820 1821 1822
	NULL,
};

static struct attribute *md_redundancy_attrs[] = {
1823
	&md_scan_mode.attr,
1824
	&md_mismatches.attr,
1825 1826
	NULL,
};
1827 1828 1829 1830 1831
static struct attribute_group md_redundancy_group = {
	.name = NULL,
	.attrs = md_redundancy_attrs,
};

1832 1833 1834 1835 1836 1837

static ssize_t
md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
	struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
	mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
1838
	ssize_t rv;
1839 1840 1841

	if (!entry->show)
		return -EIO;
1842 1843 1844 1845
	mddev_lock(mddev);
	rv = entry->show(mddev, page);
	mddev_unlock(mddev);
	return rv;
1846 1847 1848 1849 1850 1851 1852 1853
}

static ssize_t
md_attr_store(struct kobject *kobj, struct attribute *attr,
	      const char *page, size_t length)
{
	struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
	mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
1854
	ssize_t rv;
1855 1856 1857

	if (!entry->store)
		return -EIO;
1858 1859 1860 1861
	mddev_lock(mddev);
	rv = entry->store(mddev, page, length);
	mddev_unlock(mddev);
	return rv;
1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879
}

static void md_free(struct kobject *ko)
{
	mddev_t *mddev = container_of(ko, mddev_t, kobj);
	kfree(mddev);
}

static struct sysfs_ops md_sysfs_ops = {
	.show	= md_attr_show,
	.store	= md_attr_store,
};
static struct kobj_type md_ktype = {
	.release	= md_free,
	.sysfs_ops	= &md_sysfs_ops,
	.default_attrs	= md_default_attrs,
};

L
Linus Torvalds 已提交
1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920
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);
1921
	mddev->kobj.parent = &disk->kobj;
1922 1923 1924 1925
	mddev->kobj.k_name = NULL;
	snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
	mddev->kobj.ktype = &md_ktype;
	kobject_register(&mddev->kobj);
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	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];

1949 1950
	if (list_empty(&mddev->disks))
		/* cannot run an array with no devices.. */
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		return -EINVAL;

	if (mddev->pers)
		return -EBUSY;

	/*
	 * Analyze all RAID superblock(s)
	 */
1959 1960
	if (!mddev->raid_disks)
		analyze_sbs(mddev);
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	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) {
1986
			printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
L
Linus Torvalds 已提交
1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
			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) {
1997
			if (test_bit(Faulty, &rdev->flags))
L
Linus Torvalds 已提交
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
				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) {
2025
		if (test_bit(Faulty, &rdev->flags))
L
Linus Torvalds 已提交
2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046
			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);

2047
	mddev->recovery = 0;
L
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2048
	mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
2049
	mddev->barriers_work = 1;
L
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2050

2051 2052 2053
	if (start_readonly)
		mddev->ro = 2; /* read-only, but switch on first write */

2054 2055 2056 2057 2058 2059 2060
	/* before we start the array running, initialise the bitmap */
	err = bitmap_create(mddev);
	if (err)
		printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
			mdname(mddev), err);
	else
		err = mddev->pers->run(mddev);
L
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2061 2062 2063 2064
	if (err) {
		printk(KERN_ERR "md: pers->run() failed ...\n");
		module_put(mddev->pers->owner);
		mddev->pers = NULL;
2065 2066
		bitmap_destroy(mddev);
		return err;
L
Linus Torvalds 已提交
2067
	}
2068 2069
	if (mddev->pers->sync_request)
		sysfs_create_group(&mddev->kobj, &md_redundancy_group);
2070 2071 2072
	else if (mddev->ro == 2) /* auto-readonly not meaningful */
		mddev->ro = 0;

L
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 	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;
2079 2080 2081 2082 2083 2084 2085

	ITERATE_RDEV(mddev,rdev,tmp)
		if (rdev->raid_disk >= 0) {
			char nm[20];
			sprintf(nm, "rd%d", rdev->raid_disk);
			sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
		}
L
Linus Torvalds 已提交
2086 2087
	
	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2088
	md_wakeup_thread(mddev->thread);
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	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;
2171
			if (mddev->ro==1)
L
Linus Torvalds 已提交
2172 2173 2174
				goto out;
			mddev->ro = 1;
		} else {
2175
			bitmap_flush(mddev);
2176
			md_super_wait(mddev);
L
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2177 2178 2179 2180
			if (mddev->ro)
				set_disk_ro(disk, 0);
			blk_queue_make_request(mddev->queue, md_fail_request);
			mddev->pers->stop(mddev);
2181 2182 2183
			if (mddev->pers->sync_request)
				sysfs_remove_group(&mddev->kobj, &md_redundancy_group);

L
Linus Torvalds 已提交
2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
			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);
	}
2197 2198 2199 2200 2201 2202 2203

	bitmap_destroy(mddev);
	if (mddev->bitmap_file) {
		atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
		fput(mddev->bitmap_file);
		mddev->bitmap_file = NULL;
	}
2204
	mddev->bitmap_offset = 0;
2205

L
Linus Torvalds 已提交
2206 2207 2208 2209
	/*
	 * Free resources if final stop
	 */
	if (!ro) {
2210 2211
		mdk_rdev_t *rdev;
		struct list_head *tmp;
L
Linus Torvalds 已提交
2212 2213 2214
		struct gendisk *disk;
		printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));

2215 2216 2217 2218 2219 2220 2221
		ITERATE_RDEV(mddev,rdev,tmp)
			if (rdev->raid_disk >= 0) {
				char nm[20];
				sprintf(nm, "rd%d", rdev->raid_disk);
				sysfs_remove_link(&mddev->kobj, nm);
			}

L
Linus Torvalds 已提交
2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242
		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;

2243
	if (list_empty(&mddev->disks))
L
Linus Torvalds 已提交
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		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;
	}

2374
	if (test_bit(Faulty, &start_rdev->flags)) {
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		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++;
2433
		if (test_bit(Faulty, &rdev->flags))
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			failed++;
		else {
			working++;
2437
			if (test_bit(In_sync, &rdev->flags))
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				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);
2459 2460
	if (mddev->bitmap && mddev->bitmap_offset)
		info.state = (1<<MD_SB_BITMAP_PRESENT);
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	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;
}

2475
static int get_bitmap_file(mddev_t * mddev, void __user * arg)
2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510
{
	mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
	char *ptr, *buf = NULL;
	int err = -ENOMEM;

	file = kmalloc(sizeof(*file), GFP_KERNEL);
	if (!file)
		goto out;

	/* bitmap disabled, zero the first byte and copy out */
	if (!mddev->bitmap || !mddev->bitmap->file) {
		file->pathname[0] = '\0';
		goto copy_out;
	}

	buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
	if (!buf)
		goto out;

	ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
	if (!ptr)
		goto out;

	strcpy(file->pathname, ptr);

copy_out:
	err = 0;
	if (copy_to_user(arg, file, sizeof(*file)))
		err = -EFAULT;
out:
	kfree(buf);
	kfree(file);
	return err;
}

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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;
2528
		if (test_bit(Faulty, &rdev->flags))
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			info.state |= (1<<MD_DISK_FAULTY);
2530
		else if (test_bit(In_sync, &rdev->flags)) {
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			info.state |= (1<<MD_DISK_ACTIVE);
			info.state |= (1<<MD_DISK_SYNC);
		}
2534 2535
		if (test_bit(WriteMostly, &rdev->flags))
			info.state |= (1<<MD_DISK_WRITEMOSTLY);
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	} 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;
		}
2600 2601 2602 2603 2604
		if (mddev->persistent)
			rdev = md_import_device(dev, mddev->major_version,
						mddev->minor_version);
		else
			rdev = md_import_device(dev, -1, -1);
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		if (IS_ERR(rdev)) {
			printk(KERN_WARNING 
				"md: md_import_device returned %ld\n",
				PTR_ERR(rdev));
			return PTR_ERR(rdev);
		}
2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622
		/* set save_raid_disk if appropriate */
		if (!mddev->persistent) {
			if (info->state & (1<<MD_DISK_SYNC)  &&
			    info->raid_disk < mddev->raid_disks)
				rdev->raid_disk = info->raid_disk;
			else
				rdev->raid_disk = -1;
		} else
			super_types[mddev->major_version].
				validate_super(mddev, rdev);
		rdev->saved_raid_disk = rdev->raid_disk;

2623
		clear_bit(In_sync, &rdev->flags); /* just to be sure */
2624 2625 2626
		if (info->state & (1<<MD_DISK_WRITEMOSTLY))
			set_bit(WriteMostly, &rdev->flags);

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		rdev->raid_disk = -1;
		err = bind_rdev_to_array(rdev, mddev);
		if (err)
			export_rdev(rdev);
2631 2632

		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2633
		md_wakeup_thread(mddev->thread);
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		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;

2661 2662
		rdev->flags = 0;

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		if (rdev->raid_disk < mddev->raid_disks)
2664 2665
			if (info->state & (1<<MD_DISK_SYNC))
				set_bit(In_sync, &rdev->flags);
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		if (info->state & (1<<MD_DISK_WRITEMOSTLY))
			set_bit(WriteMostly, &rdev->flags);

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		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;
	}

2764
	if (test_bit(Faulty, &rdev->flags)) {
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		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;
	}
2771
	clear_bit(In_sync, &rdev->flags);
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	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;
}

2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828
/* similar to deny_write_access, but accounts for our holding a reference
 * to the file ourselves */
static int deny_bitmap_write_access(struct file * file)
{
	struct inode *inode = file->f_mapping->host;

	spin_lock(&inode->i_lock);
	if (atomic_read(&inode->i_writecount) > 1) {
		spin_unlock(&inode->i_lock);
		return -ETXTBSY;
	}
	atomic_set(&inode->i_writecount, -1);
	spin_unlock(&inode->i_lock);

	return 0;
}

static int set_bitmap_file(mddev_t *mddev, int fd)
{
	int err;

2829 2830 2831 2832 2833 2834 2835
	if (mddev->pers) {
		if (!mddev->pers->quiesce)
			return -EBUSY;
		if (mddev->recovery || mddev->sync_thread)
			return -EBUSY;
		/* we should be able to change the bitmap.. */
	}
2836 2837


2838 2839 2840 2841
	if (fd >= 0) {
		if (mddev->bitmap)
			return -EEXIST; /* cannot add when bitmap is present */
		mddev->bitmap_file = fget(fd);
2842

2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856
		if (mddev->bitmap_file == NULL) {
			printk(KERN_ERR "%s: error: failed to get bitmap file\n",
			       mdname(mddev));
			return -EBADF;
		}

		err = deny_bitmap_write_access(mddev->bitmap_file);
		if (err) {
			printk(KERN_ERR "%s: error: bitmap file is already in use\n",
			       mdname(mddev));
			fput(mddev->bitmap_file);
			mddev->bitmap_file = NULL;
			return err;
		}
2857
		mddev->bitmap_offset = 0; /* file overrides offset */
2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873
	} else if (mddev->bitmap == NULL)
		return -ENOENT; /* cannot remove what isn't there */
	err = 0;
	if (mddev->pers) {
		mddev->pers->quiesce(mddev, 1);
		if (fd >= 0)
			err = bitmap_create(mddev);
		if (fd < 0 || err)
			bitmap_destroy(mddev);
		mddev->pers->quiesce(mddev, 0);
	} else if (fd < 0) {
		if (mddev->bitmap_file)
			fput(mddev->bitmap_file);
		mddev->bitmap_file = NULL;
	}

2874 2875 2876
	return err;
}

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/*
 * 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;
2953 2954 2955 2956 2957
	int state = 0;

	/* calculate expected state,ignoring low bits */
	if (mddev->bitmap && mddev->bitmap_offset)
		state |= (1 << MD_SB_BITMAP_PRESENT);
L
Linus Torvalds 已提交
2958 2959 2960 2961 2962 2963 2964 2965

	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||
2966 2967 2968 2969
	    mddev->chunk_size    != info->chunk_size    ||
	    /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
	    ((state^info->state) & 0xfffffe00)
		)
L
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2970 2971 2972 2973 2974
		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++;
2975
	if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
L
Linus Torvalds 已提交
2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053
	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);
			}
		}
	}
3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082
	if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
		if (mddev->pers->quiesce == NULL)
			return -EINVAL;
		if (mddev->recovery || mddev->sync_thread)
			return -EBUSY;
		if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
			/* add the bitmap */
			if (mddev->bitmap)
				return -EEXIST;
			if (mddev->default_bitmap_offset == 0)
				return -EINVAL;
			mddev->bitmap_offset = mddev->default_bitmap_offset;
			mddev->pers->quiesce(mddev, 1);
			rv = bitmap_create(mddev);
			if (rv)
				bitmap_destroy(mddev);
			mddev->pers->quiesce(mddev, 0);
		} else {
			/* remove the bitmap */
			if (!mddev->bitmap)
				return -ENOENT;
			if (mddev->bitmap->file)
				return -EINVAL;
			mddev->pers->quiesce(mddev, 1);
			bitmap_destroy(mddev);
			mddev->pers->quiesce(mddev, 0);
			mddev->bitmap_offset = 0;
		}
	}
L
Linus Torvalds 已提交
3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225
	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:
	 */
3226 3227 3228 3229
	/* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
	 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
	if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
			&& cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
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Linus Torvalds 已提交
3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242
		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;

3243
		case GET_BITMAP_FILE:
3244
			err = get_bitmap_file(mddev, argp);
3245 3246
			goto done_unlock;

L
Linus Torvalds 已提交
3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290
		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
3291 3292 3293 3294
	 * superblock, so we do not allow them on read-only arrays.
	 * However non-MD ioctls (e.g. get-size) will still come through
	 * here and hit the 'default' below, so only disallow
	 * 'md' ioctls, and switch to rw mode if started auto-readonly.
L
Linus Torvalds 已提交
3295
	 */
3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306
	if (_IOC_TYPE(cmd) == MD_MAJOR &&
	    mddev->ro && mddev->pers) {
		if (mddev->ro == 2) {
			mddev->ro = 0;
		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
		md_wakeup_thread(mddev->thread);

		} else {
			err = -EROFS;
			goto abort_unlock;
		}
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Linus Torvalds 已提交
3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336
	}

	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;

3337 3338 3339 3340
		case SET_BITMAP_FILE:
			err = set_bitmap_file(mddev, (int)arg);
			goto done_unlock;

L
Linus Torvalds 已提交
3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418
		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,
};

A
Adrian Bunk 已提交
3419
static int md_thread(void * arg)
L
Linus Torvalds 已提交
3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434
{
	mdk_thread_t *thread = arg;

	/*
	 * 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.
	 */

N
NeilBrown 已提交
3435
	allow_signal(SIGKILL);
3436
	while (!kthread_should_stop()) {
L
Linus Torvalds 已提交
3437

3438 3439 3440 3441
		wait_event_timeout(thread->wqueue,
				   test_bit(THREAD_WAKEUP, &thread->flags)
				   || kthread_should_stop(),
				   thread->timeout);
3442
		try_to_freeze();
L
Linus Torvalds 已提交
3443 3444 3445

		clear_bit(THREAD_WAKEUP, &thread->flags);

3446
		thread->run(thread->mddev);
L
Linus Torvalds 已提交
3447
	}
3448

L
Linus Torvalds 已提交
3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465
	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;

3466
	thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL);
L
Linus Torvalds 已提交
3467 3468 3469 3470 3471 3472 3473 3474
	if (!thread)
		return NULL;

	memset(thread, 0, sizeof(mdk_thread_t));
	init_waitqueue_head(&thread->wqueue);

	thread->run = run;
	thread->mddev = mddev;
3475
	thread->timeout = MAX_SCHEDULE_TIMEOUT;
N
NeilBrown 已提交
3476
	thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
3477
	if (IS_ERR(thread->tsk)) {
L
Linus Torvalds 已提交
3478 3479 3480 3481 3482 3483 3484 3485
		kfree(thread);
		return NULL;
	}
	return thread;
}

void md_unregister_thread(mdk_thread_t *thread)
{
3486
	dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
3487 3488

	kthread_stop(thread->tsk);
L
Linus Torvalds 已提交
3489 3490 3491 3492 3493 3494 3495 3496 3497 3498
	kfree(thread);
}

void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
{
	if (!mddev) {
		MD_BUG();
		return;
	}

3499
	if (!rdev || test_bit(Faulty, &rdev->flags))
L
Linus Torvalds 已提交
3500
		return;
3501
/*
L
Linus Torvalds 已提交
3502 3503 3504 3505 3506
	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));
3507
*/
L
Linus Torvalds 已提交
3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660
	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;
3661
	struct bitmap *bitmap;
L
Linus Torvalds 已提交
3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684

	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) {
3685
			if (mddev->ro==1)
L
Linus Torvalds 已提交
3686
				seq_printf(seq, " (read-only)");
3687 3688
			if (mddev->ro==2)
				seq_printf(seq, "(auto-read-only)");
L
Linus Torvalds 已提交
3689 3690 3691 3692 3693 3694 3695 3696
			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);
3697 3698
			if (test_bit(WriteMostly, &rdev->flags))
				seq_printf(seq, "(W)");
3699
			if (test_bit(Faulty, &rdev->flags)) {
L
Linus Torvalds 已提交
3700 3701
				seq_printf(seq, "(F)");
				continue;
3702 3703
			} else if (rdev->raid_disk < 0)
				seq_printf(seq, "(S)"); /* spare */
L
Linus Torvalds 已提交
3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714
			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);
		}
3715 3716 3717 3718 3719 3720 3721 3722 3723
		if (mddev->persistent) {
			if (mddev->major_version != 0 ||
			    mddev->minor_version != 90) {
				seq_printf(seq," super %d.%d",
					   mddev->major_version,
					   mddev->minor_version);
			}
		} else
			seq_printf(seq, " super non-persistent");
L
Linus Torvalds 已提交
3724 3725 3726 3727

		if (mddev->pers) {
			mddev->pers->status (seq, mddev);
	 		seq_printf(seq, "\n      ");
3728 3729 3730 3731 3732 3733 3734 3735 3736
			if (mddev->pers->sync_request) {
				if (mddev->curr_resync > 2) {
					status_resync (seq, mddev);
					seq_printf(seq, "\n      ");
				} else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
					seq_printf(seq, "\tresync=DELAYED\n      ");
				else if (mddev->recovery_cp < MaxSector)
					seq_printf(seq, "\tresync=PENDING\n      ");
			}
3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752
		} else
			seq_printf(seq, "\n       ");

		if ((bitmap = mddev->bitmap)) {
			unsigned long chunk_kb;
			unsigned long flags;
			spin_lock_irqsave(&bitmap->lock, flags);
			chunk_kb = bitmap->chunksize >> 10;
			seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
				"%lu%s chunk",
				bitmap->pages - bitmap->missing_pages,
				bitmap->pages,
				(bitmap->pages - bitmap->missing_pages)
					<< (PAGE_SHIFT - 10),
				chunk_kb ? chunk_kb : bitmap->chunksize,
				chunk_kb ? "KB" : "B");
3753 3754 3755 3756
			if (bitmap->file) {
				seq_printf(seq, ", file: ");
				seq_path(seq, bitmap->file->f_vfsmnt,
					 bitmap->file->f_dentry," \t\n");
3757
			}
3758

3759 3760
			seq_printf(seq, "\n");
			spin_unlock_irqrestore(&bitmap->lock, flags);
L
Linus Torvalds 已提交
3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814
		}

		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)
{
3815
	if (pnum >= MAX_PERSONALITY)
L
Linus Torvalds 已提交
3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834
		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;
3835 3836
		curr_events = disk_stat_read(disk, sectors[0]) + 
				disk_stat_read(disk, sectors[1]) - 
L
Linus Torvalds 已提交
3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862
				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 ....
	}
}


3863 3864
/* md_write_start(mddev, bi)
 * If we need to update some array metadata (e.g. 'active' flag
3865 3866
 * in superblock) before writing, schedule a superblock update
 * and wait for it to complete.
3867
 */
3868
void md_write_start(mddev_t *mddev, struct bio *bi)
L
Linus Torvalds 已提交
3869
{
3870
	if (bio_data_dir(bi) != WRITE)
3871
		return;
3872

3873 3874 3875 3876 3877 3878 3879
	BUG_ON(mddev->ro == 1);
	if (mddev->ro == 2) {
		/* need to switch to read/write */
		mddev->ro = 0;
		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
		md_wakeup_thread(mddev->thread);
	}
3880 3881
	atomic_inc(&mddev->writes_pending);
	if (mddev->in_sync) {
3882
		spin_lock_irq(&mddev->write_lock);
3883 3884 3885 3886 3887
		if (mddev->in_sync) {
			mddev->in_sync = 0;
			mddev->sb_dirty = 1;
			md_wakeup_thread(mddev->thread);
		}
3888
		spin_unlock_irq(&mddev->write_lock);
3889
	}
3890
	wait_event(mddev->sb_wait, mddev->sb_dirty==0);
L
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3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902
}

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);
	}
}

A
Adrian Bunk 已提交
3903
static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
L
Linus Torvalds 已提交
3904 3905 3906 3907 3908 3909 3910 3911

#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;
3912
	sector_t max_sectors,j, io_sectors;
L
Linus Torvalds 已提交
3913 3914 3915 3916 3917
	unsigned long mark[SYNC_MARKS];
	sector_t mark_cnt[SYNC_MARKS];
	int last_mark,m;
	struct list_head *tmp;
	sector_t last_check;
3918
	int skipped = 0;
L
Linus Torvalds 已提交
3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943

	/* 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:
3944
		if (kthread_should_stop()) {
N
NeilBrown 已提交
3945
			set_bit(MD_RECOVERY_INTR, &mddev->recovery);
L
Linus Torvalds 已提交
3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963
			goto skip;
		}
		ITERATE_MDDEV(mddev2,tmp) {
			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;
3964 3965
				prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
				if (!kthread_should_stop() &&
3966
				    mddev2->curr_resync >= mddev->curr_resync) {
L
Linus Torvalds 已提交
3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980
					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);

3981
	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
L
Linus Torvalds 已提交
3982
		/* resync follows the size requested by the personality,
3983
		 * which defaults to physical size, but can be virtual size
L
Linus Torvalds 已提交
3984 3985
		 */
		max_sectors = mddev->resync_max_sectors;
3986 3987
		mddev->resync_mismatches = 0;
	} else
L
Linus Torvalds 已提交
3988 3989 3990 3991 3992 3993
		/* 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);
3994
	printk(KERN_INFO "md: using maximum available idle IO bandwidth "
L
Linus Torvalds 已提交
3995 3996 3997 3998
	       "(but not more than %d KB/sec) for reconstruction.\n",
	       sysctl_speed_limit_max);

	is_mddev_idle(mddev); /* this also initializes IO event counters */
3999
	/* we don't use the checkpoint if there's a bitmap */
4000 4001
	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
	    && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
L
Linus Torvalds 已提交
4002 4003 4004
		j = mddev->recovery_cp;
	else
		j = 0;
4005
	io_sectors = 0;
L
Linus Torvalds 已提交
4006 4007
	for (m = 0; m < SYNC_MARKS; m++) {
		mark[m] = jiffies;
4008
		mark_cnt[m] = io_sectors;
L
Linus Torvalds 已提交
4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032
	}
	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) {
4033
		sector_t sectors;
L
Linus Torvalds 已提交
4034

4035 4036 4037 4038
		skipped = 0;
		sectors = mddev->pers->sync_request(mddev, j, &skipped,
					    currspeed < sysctl_speed_limit_min);
		if (sectors == 0) {
L
Linus Torvalds 已提交
4039 4040 4041
			set_bit(MD_RECOVERY_ERR, &mddev->recovery);
			goto out;
		}
4042 4043 4044 4045 4046 4047

		if (!skipped) { /* actual IO requested */
			io_sectors += sectors;
			atomic_add(sectors, &mddev->recovery_active);
		}

L
Linus Torvalds 已提交
4048 4049 4050
		j += sectors;
		if (j>1) mddev->curr_resync = j;

4051 4052

		if (last_check + window > io_sectors || j == max_sectors)
L
Linus Torvalds 已提交
4053 4054
			continue;

4055
		last_check = io_sectors;
L
Linus Torvalds 已提交
4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068

		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;
4069
			mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
L
Linus Torvalds 已提交
4070 4071 4072 4073
			last_mark = next;
		}


4074
		if (kthread_should_stop()) {
L
Linus Torvalds 已提交
4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094
			/*
			 * got a signal, exit.
			 */
			printk(KERN_INFO 
				"md: md_do_sync() got signal ... exiting\n");
			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();

4095 4096
		currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
			/((jiffies-mddev->resync_mark)/HZ +1) +1;
L
Linus Torvalds 已提交
4097 4098 4099 4100

		if (currspeed > sysctl_speed_limit_min) {
			if ((currspeed > sysctl_speed_limit_max) ||
					!is_mddev_idle(mddev)) {
4101
				msleep(250);
L
Linus Torvalds 已提交
4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115
				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 */
4116
	mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
L
Linus Torvalds 已提交
4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165

	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;
	}

 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;


4166 4167
	if (mddev->bitmap)
		bitmap_daemon_work(mddev->bitmap);
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4168 4169 4170

	if (mddev->ro)
		return;
4171 4172 4173 4174 4175 4176 4177 4178 4179 4180

	if (signal_pending(current)) {
		if (mddev->pers->sync_request) {
			printk(KERN_INFO "md: %s in immediate safe mode\n",
			       mdname(mddev));
			mddev->safemode = 2;
		}
		flush_signals(current);
	}

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	if ( ! (
		mddev->sb_dirty ||
		test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
4184 4185 4186 4187
		test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
		(mddev->safemode == 1) ||
		(mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
		 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
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4188 4189
		))
		return;
4190

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4191 4192
	if (mddev_trylock(mddev)==0) {
		int spares =0;
4193

4194
		spin_lock_irq(&mddev->write_lock);
4195 4196 4197 4198 4199 4200 4201
		if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
		    !mddev->in_sync && mddev->recovery_cp == MaxSector) {
			mddev->in_sync = 1;
			mddev->sb_dirty = 1;
		}
		if (mddev->safemode == 1)
			mddev->safemode = 0;
4202
		spin_unlock_irq(&mddev->write_lock);
4203

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		if (mddev->sb_dirty)
			md_update_sb(mddev);
4206 4207


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		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);
4225 4226 4227 4228 4229 4230 4231 4232

			/* if array is no-longer degraded, then any saved_raid_disk
			 * information must be scrapped
			 */
			if (!mddev->degraded)
				ITERATE_RDEV(mddev,rdev,rtmp)
					rdev->saved_raid_disk = -1;

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			mddev->recovery = 0;
			/* flag recovery needed just to double check */
			set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
			goto unlock;
		}
4238 4239 4240 4241 4242 4243 4244
		/* Clear some bits that don't mean anything, but
		 * might be left set
		 */
		clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
		clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
		clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
		clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
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		/* 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 &&
4254
			    (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
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			    atomic_read(&rdev->nr_pending)==0) {
4256 4257 4258 4259
				if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
					char nm[20];
					sprintf(nm,"rd%d", rdev->raid_disk);
					sysfs_remove_link(&mddev->kobj, nm);
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					rdev->raid_disk = -1;
4261
				}
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			}

		if (mddev->degraded) {
			ITERATE_RDEV(mddev,rdev,rtmp)
				if (rdev->raid_disk < 0
4267
				    && !test_bit(Faulty, &rdev->flags)) {
4268 4269 4270 4271
					if (mddev->pers->hot_add_disk(mddev,rdev)) {
						char nm[20];
						sprintf(nm, "rd%d", rdev->raid_disk);
						sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
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						spares++;
4273
					} else
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						break;
				}
		}

4278 4279 4280 4281 4282 4283 4284
		if (spares) {
			clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
			clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
		} else if (mddev->recovery_cp < MaxSector) {
			set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
		} else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
			/* nothing to be done ... */
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			goto unlock;
4286

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		if (mddev->pers->sync_request) {
			set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4289 4290 4291 4292 4293 4294 4295
			if (spares && mddev->bitmap && ! mddev->bitmap->file) {
				/* We are adding a device or devices to an array
				 * which has the bitmap stored on all devices.
				 * So make sure all bitmap pages get written
				 */
				bitmap_write_all(mddev->bitmap);
			}
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			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);
	}
}

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static int md_notify_reboot(struct notifier_block *this,
			    unsigned long code, void *x)
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{
	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;
}

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Adrian Bunk 已提交
4338
static struct notifier_block md_notifier = {
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4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354
	.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;
}

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Adrian Bunk 已提交
4355
static int __init md_init(void)
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4356 4357 4358 4359 4360 4361 4362
{
	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);
4363
	printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
4364
			BITMAP_MINOR);
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4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426

	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;

4427
		if (test_bit(Faulty, &rdev->flags)) {
L
Linus Torvalds 已提交
4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473
			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)

4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490
static int get_ro(char *buffer, struct kernel_param *kp)
{
	return sprintf(buffer, "%d", start_readonly);
}
static int set_ro(const char *val, struct kernel_param *kp)
{
	char *e;
	int num = simple_strtoul(val, &e, 10);
	if (*val && (*e == '\0' || *e == '\n')) {
		start_readonly = num;
		return 0;;
	}
	return -EINVAL;
}

module_param_call(start_ro, set_ro, get_ro, NULL, 0600);

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Linus Torvalds 已提交
4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502
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_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");
4503
MODULE_ALIAS("md");
4504
MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);