Merge with 2.3.43. I did ignore all modifications to the qlogicisp.c

driver due to the Origin A64 hacks.

1 files changed, 2944 insertions, 849 deletions

diff --git a/drivers/block/md.c b/drivers/block/md.c
index b5b170069..752c7b0ab 100644
--- a/drivers/block/md.c
+++ b/drivers/block/md.c
@@ -1,21 +1,17 @@
-
 /*
    md.c : Multiple Devices driver for Linux
-          Copyright (C) 1994-96 Marc ZYNGIER
-	  <zyngier@ufr-info-p7.ibp.fr> or
-	  <maz@gloups.fdn.fr>
+          Copyright (C) 1998, 1999, 2000 Ingo Molnar
 
-   A lot of inspiration came from hd.c ...
+     completely rewritten, based on the MD driver code from Marc Zyngier
 
-   kerneld support by Boris Tobotras <boris@xtalk.msk.su>
-   boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
+   Changes:
 
-   RAID-1/RAID-5 extensions by:
-        Ingo Molnar, Miguel de Icaza, Gadi Oxman
+   - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
+   - 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>
 
-   Changes for kmod by:
-   	Cyrus Durgin
-   
    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)
@@ -26,233 +22,1193 @@
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
 */
 
-/*
- * Current RAID-1,4,5 parallel reconstruction speed limit is 1024 KB/sec, so
- * the extra system load does not show up that much. Increase it if your
- * system can take more.
- */
-#define SPEED_LIMIT 1024
-
 #include <linux/config.h>
-#include <linux/module.h>
-#include <linux/version.h>
-#include <linux/malloc.h>
-#include <linux/mm.h>
-#include <linux/md.h>
-#include <linux/hdreg.h>
-#include <linux/stat.h>
-#include <linux/fs.h>
-#include <linux/proc_fs.h>
-#include <linux/blkdev.h>
-#include <linux/genhd.h>
-#include <linux/smp_lock.h>
+#include <linux/raid/md.h>
+
 #ifdef CONFIG_KMOD
 #include <linux/kmod.h>
 #endif
-#include <linux/errno.h>
-#include <linux/init.h>
 
 #define __KERNEL_SYSCALLS__
 #include <linux/unistd.h>
 
+#include <asm/unaligned.h>
+
+extern asmlinkage int sys_sched_yield(void);
+extern asmlinkage int sys_setsid(void);
+
+extern unsigned long io_events[MAX_BLKDEV];
+
 #define MAJOR_NR MD_MAJOR
 #define MD_DRIVER
 
 #include <linux/blk.h>
-#include <linux/blkpg.h>
-#include <asm/uaccess.h>
-#include <asm/bitops.h>
-#include <asm/atomic.h>
 
 #ifdef CONFIG_MD_BOOT
-extern kdev_t name_to_kdev_t(char *line) __init;
+extern kdev_t name_to_kdev_t(char *line) md__init;
 #endif
 
-static struct hd_struct md_hd_struct[MAX_MD_DEV];
-static int md_blocksizes[MAX_MD_DEV];
-int md_maxreadahead[MAX_MD_DEV];
-#if SUPPORT_RECONSTRUCTION
-static struct md_thread *md_sync_thread = NULL;
-#endif /* SUPPORT_RECONSTRUCTION */
+#define DEBUG 0
+#if DEBUG
+# define dprintk(x...) printk(x)
+#else
+# define dprintk(x...) do { } while(0)
+#endif
+
+static mdk_personality_t *pers[MAX_PERSONALITY] = {NULL, };
+
+/*
+ * these have to be allocated separately because external
+ * subsystems want to have a pre-defined structure
+ */
+struct hd_struct md_hd_struct[MAX_MD_DEVS];
+static int md_blocksizes[MAX_MD_DEVS];
+static int md_maxreadahead[MAX_MD_DEVS];
+static mdk_thread_t *md_recovery_thread = NULL;
 
-int md_size[MAX_MD_DEV]={0, };
+int md_size[MAX_MD_DEVS] = {0, };
 
 static struct gendisk md_gendisk=
 {
-  MD_MAJOR,
-  "md",
-  0,
-  1,
-  md_hd_struct,
-  md_size,
-  MAX_MD_DEV,
-  NULL,
-  NULL
+	MD_MAJOR,
+	"md",
+	0,
+	1,
+	md_hd_struct,
+	md_size,
+	MAX_MD_DEVS,
+	NULL,
+	NULL
 };
 
-static struct md_personality *pers[MAX_PERSONALITY]={NULL, };
-struct md_dev md_dev[MAX_MD_DEV];
+void md_plug_device (request_queue_t *mdqueue, kdev_t dev)
+{
+	mdk_rdev_t * rdev;
+	struct md_list_head *tmp;
+	request_queue_t *q;
+	mddev_t *mddev;
+
+	if (!md_test_and_set_bit(0, (atomic_t *)&mdqueue->plugged)) {
+ 		mddev = kdev_to_mddev(dev);
+		ITERATE_RDEV(mddev,rdev,tmp) {
+			q = blk_get_queue(rdev->dev);
+			generic_unplug_device(q);
+		}
+		queue_task(&mdqueue->plug_tq, &tq_disk);
+	}
+}
+
+static void md_unplug_device (void * data)
+{
+	mdk_rdev_t * rdev;
+	struct md_list_head *tmp;
+	mddev_t *mddev = (mddev_t *)data;
+	request_queue_t *mdqueue = &mddev->queue, *q;
+
+	clear_bit(0, (atomic_t *)&mdqueue->plugged);
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		q = blk_get_queue(rdev->dev);
+		generic_unplug_device(q);
+	}
+}
+
+/*
+ * Enables to iterate over all existing md arrays
+ */
+static MD_LIST_HEAD(all_mddevs);
+
+/*
+ * The mapping between kdev and mddev is not necessary a simple
+ * one! Eg. HSM uses several sub-devices to implement Logical
+ * Volumes. All these sub-devices map to the same mddev.
+ */
+dev_mapping_t mddev_map [MAX_MD_DEVS] = { {NULL, 0}, };
+
+void add_mddev_mapping (mddev_t * mddev, kdev_t dev, void *data)
+{
+	unsigned int minor = MINOR(dev);
+
+	if (MAJOR(dev) != MD_MAJOR) {
+		MD_BUG();
+		return;
+	}
+	if (mddev_map[minor].mddev != NULL) {
+		MD_BUG();
+		return;
+	}
+	mddev_map[minor].mddev = mddev;
+	mddev_map[minor].data = data;
+}
+
+void del_mddev_mapping (mddev_t * mddev, kdev_t dev)
+{
+	unsigned int minor = MINOR(dev);
+
+	if (MAJOR(dev) != MD_MAJOR) {
+		MD_BUG();
+		return;
+	}
+	if (mddev_map[minor].mddev != mddev) {
+		MD_BUG();
+		return;
+	}
+	mddev_map[minor].mddev = NULL;
+	mddev_map[minor].data = NULL;
+}
+
+static request_queue_t *md_get_queue (kdev_t dev)
+{
+	mddev_t *mddev = kdev_to_mddev(dev);
 
-int md_thread(void * arg);
+	if (!mddev)
+		return NULL;
+	return &mddev->queue;
+}
 
-static int legacy_raid_sb (int minor, int pnum)
+static void do_md_request (request_queue_t * q)
 {
-	int i, factor;
+	printk(KERN_ALERT "Got md request, not good...");
+	BUG();
+	return;
+}
 
-	factor = 1 << FACTOR_SHIFT(FACTOR((md_dev+minor)));
+void md_make_request (int rw, struct buffer_head * bh)
+{
+	mddev_t *mddev = kdev_to_mddev(bh->b_dev);
+
+	if (!mddev || !mddev->pers)
+		bh->b_end_io(bh, 0);
+	else {
+		if ((rw == READ || rw == READA) && buffer_uptodate(bh))
+			bh->b_end_io(bh, 1);
+		else
+			mddev->pers->make_request(mddev, rw, bh);
+	}
+}
 
-	/*****
+static mddev_t * alloc_mddev (kdev_t dev)
+{
+	request_queue_t *q;
+	mddev_t *mddev;
+
+	if (MAJOR(dev) != MD_MAJOR) {
+		MD_BUG();
+		return 0;
+	}
+	mddev = (mddev_t *) kmalloc(sizeof(*mddev), GFP_KERNEL);
+	if (!mddev)
+		return NULL;
+		
+	memset(mddev, 0, sizeof(*mddev));
+
+	mddev->__minor = MINOR(dev);
+	init_MUTEX(&mddev->reconfig_sem);
+	init_MUTEX(&mddev->recovery_sem);
+	init_MUTEX(&mddev->resync_sem);
+	MD_INIT_LIST_HEAD(&mddev->disks);
+	MD_INIT_LIST_HEAD(&mddev->all_mddevs);
+
+	q = &mddev->queue;
+	blk_init_queue(q, DEVICE_REQUEST);
+	blk_queue_pluggable(q, md_plug_device);
+	blk_queue_make_request(q, md_make_request);
+	
+	q->plug_tq.sync = 0;
+        q->plug_tq.routine = &md_unplug_device;
+        q->plug_tq.data = mddev;
+
+	/*
+	 * The 'base' mddev is the one with data NULL.
+	 * personalities can create additional mddevs 
+	 * if necessary.
+	 */
+	add_mddev_mapping(mddev, dev, 0);
+	md_list_add(&mddev->all_mddevs, &all_mddevs);
+
+	return mddev;
+}
+
+static void free_mddev (mddev_t *mddev)
+{
+	if (!mddev) {
+		MD_BUG();
+		return;
+	}
+
+	/*
+	 * Make sure nobody else is using this mddev
+	 * (careful, we rely on the global kernel lock here)
+	 */
+	while (md_atomic_read(&mddev->resync_sem.count) != 1)
+		schedule();
+	while (md_atomic_read(&mddev->recovery_sem.count) != 1)
+		schedule();
+
+	del_mddev_mapping(mddev, MKDEV(MD_MAJOR, mdidx(mddev)));
+	md_list_del(&mddev->all_mddevs);
+	MD_INIT_LIST_HEAD(&mddev->all_mddevs);
+	kfree(mddev);
+}
+
+struct gendisk * find_gendisk (kdev_t dev)
+{
+	struct gendisk *tmp = gendisk_head;
+
+	while (tmp != NULL) {
+		if (tmp->major == MAJOR(dev))
+			return (tmp);
+		tmp = tmp->next;
+	}
+	return (NULL);
+}
+
+mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
+{
+	mdk_rdev_t * rdev;
+	struct md_list_head *tmp;
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev->desc_nr == nr)
+			return rdev;
+	}
+	return NULL;
+}
+
+mdk_rdev_t * find_rdev(mddev_t * mddev, kdev_t dev)
+{
+	struct md_list_head *tmp;
+	mdk_rdev_t *rdev;
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev->dev == dev)
+			return rdev;
+	}
+	return NULL;
+}
+
+static MD_LIST_HEAD(device_names);
+
+char * partition_name (kdev_t dev)
+{
+	struct gendisk *hd;
+	static char nomem [] = "<nomem>";
+	dev_name_t *dname;
+	struct md_list_head *tmp = device_names.next;
+
+	while (tmp != &device_names) {
+		dname = md_list_entry(tmp, dev_name_t, list);
+		if (dname->dev == dev)
+			return dname->name;
+		tmp = tmp->next;
+	}
+
+	dname = (dev_name_t *) kmalloc(sizeof(*dname), GFP_KERNEL);
+
+	if (!dname)
+		return nomem;
+	/*
+	 * ok, add this new device name to the list
+	 */
+	hd = find_gendisk (dev);
+
+	if (!hd)
+		sprintf (dname->name, "[dev %s]", kdevname(dev));
+	else
+		disk_name (hd, MINOR(dev), dname->name);
+
+	dname->dev = dev;
+	MD_INIT_LIST_HEAD(&dname->list);
+	md_list_add(&dname->list, &device_names);
+
+	return dname->name;
+}
+
+static unsigned int calc_dev_sboffset (kdev_t dev, mddev_t *mddev,
+						int persistent)
+{
+	unsigned int size = 0;
+
+	if (blk_size[MAJOR(dev)])
+		size = blk_size[MAJOR(dev)][MINOR(dev)];
+	if (persistent)
+		size = MD_NEW_SIZE_BLOCKS(size);
+	return size;
+}
+
+static unsigned int calc_dev_size (kdev_t dev, mddev_t *mddev, int persistent)
+{
+	unsigned int size;
+
+	size = calc_dev_sboffset(dev, mddev, persistent);
+	if (!mddev->sb) {
+		MD_BUG();
+		return size;
+	}
+	if (mddev->sb->chunk_size)
+		size &= ~(mddev->sb->chunk_size/1024 - 1);
+	return size;
+}
+
+static unsigned int zoned_raid_size (mddev_t *mddev)
+{
+	unsigned int mask;
+	mdk_rdev_t * rdev;
+	struct md_list_head *tmp;
+
+	if (!mddev->sb) {
+		MD_BUG();
+		return -EINVAL;
+	}
+	/*
 	 * do size and offset calculations.
 	 */
-	for (i=0; i<md_dev[minor].nb_dev; i++) {
-		md_dev[minor].devices[i].size &= ~(factor - 1);
-		md_size[minor] += md_dev[minor].devices[i].size;
-		md_dev[minor].devices[i].offset=i ? (md_dev[minor].devices[i-1].offset + 
-							md_dev[minor].devices[i-1].size) : 0;
-	}
-	if (pnum == RAID0 >> PERSONALITY_SHIFT)
-		md_maxreadahead[minor] = MD_DEFAULT_DISK_READAHEAD * md_dev[minor].nb_dev;
+	mask = ~(mddev->sb->chunk_size/1024 - 1);
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		rdev->size &= mask;
+		md_size[mdidx(mddev)] += rdev->size;
+	}
 	return 0;
 }
 
-static void free_sb (struct md_dev *mddev)
+/*
+ * We check wether all devices are numbered from 0 to nb_dev-1. The
+ * order is guaranteed even after device name changes.
+ *
+ * Some personalities (raid0, linear) use this. Personalities that
+ * provide data have to be able to deal with loss of individual
+ * disks, so they do their checking themselves.
+ */
+int md_check_ordering (mddev_t *mddev)
 {
-	int i;
-	struct real_dev *realdev;
+	int i, c;
+	mdk_rdev_t *rdev;
+	struct md_list_head *tmp;
 
-	if (mddev->sb) {
-		free_page((unsigned long) mddev->sb);
-		mddev->sb = NULL;
+	/*
+	 * First, all devices must be fully functional
+	 */
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev->faulty) {
+			printk("md: md%d's device %s faulty, aborting.\n",
+				mdidx(mddev), partition_name(rdev->dev));
+			goto abort;
+		}
+	}
+
+	c = 0;
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		c++;
 	}
-	for (i = 0; i <mddev->nb_dev; i++) {
-		realdev = mddev->devices + i;
-		if (realdev->sb) {
-			free_page((unsigned long) realdev->sb);
-			realdev->sb = NULL;
+	if (c != mddev->nb_dev) {
+		MD_BUG();
+		goto abort;
+	}
+	if (mddev->nb_dev != mddev->sb->raid_disks) {
+		printk("md: md%d, array needs %d disks, has %d, aborting.\n",
+			mdidx(mddev), mddev->sb->raid_disks, mddev->nb_dev);
+		goto abort;
+	}
+	/*
+	 * Now the numbering check
+	 */
+	for (i = 0; i < mddev->nb_dev; i++) {
+		c = 0;
+		ITERATE_RDEV(mddev,rdev,tmp) {
+			if (rdev->desc_nr == i)
+				c++;
+		}
+		if (c == 0) {
+			printk("md: md%d, missing disk #%d, aborting.\n",
+				mdidx(mddev), i);
+			goto abort;
+		}
+		if (c > 1) {
+			printk("md: md%d, too many disks #%d, aborting.\n",
+				mdidx(mddev), i);
+			goto abort;
 		}
 	}
+	return 0;
+abort:
+	return 1;
 }
 
-/*
- * Check one RAID superblock for generic plausibility
- */
+static void remove_descriptor (mdp_disk_t *disk, mdp_super_t *sb)
+{
+	if (disk_active(disk)) {
+		sb->working_disks--;
+	} else {
+		if (disk_spare(disk)) {
+			sb->spare_disks--;
+			sb->working_disks--;
+		} else	{
+			sb->failed_disks--;
+		}
+	}
+	sb->nr_disks--;
+	disk->major = 0;
+	disk->minor = 0;
+	mark_disk_removed(disk);
+}
 
 #define BAD_MAGIC KERN_ERR \
-"md: %s: invalid raid superblock magic (%x) on block %u\n"
+"md: invalid raid superblock magic on %s\n"
+
+#define BAD_MINOR KERN_ERR \
+"md: %s: invalid raid minor (%x)\n"
 
 #define OUT_OF_MEM KERN_ALERT \
 "md: out of memory.\n"
 
-#define NO_DEVICE KERN_ERR \
-"md: disabled device %s\n"
+#define NO_SB KERN_ERR \
+"md: disabled device %s, could not read superblock.\n"
 
-#define SUCCESS 0
-#define FAILURE -1
+#define BAD_CSUM KERN_WARNING \
+"md: invalid superblock checksum on %s\n"
 
-static int analyze_one_sb (struct real_dev * rdev)
+static int alloc_array_sb (mddev_t * mddev)
 {
-	int ret = FAILURE;
-	struct buffer_head *bh;
+	if (mddev->sb) {
+		MD_BUG();
+		return 0;
+	}
+
+	mddev->sb = (mdp_super_t *) __get_free_page (GFP_KERNEL);
+	if (!mddev->sb)
+		return -ENOMEM;
+	md_clear_page((unsigned long)mddev->sb);
+	return 0;
+}
+
+static int alloc_disk_sb (mdk_rdev_t * rdev)
+{
+	if (rdev->sb)
+		MD_BUG();
+
+	rdev->sb = (mdp_super_t *) __get_free_page(GFP_KERNEL);
+	if (!rdev->sb) {
+		printk (OUT_OF_MEM);
+		return -EINVAL;
+	}
+	md_clear_page((unsigned long)rdev->sb);
+
+	return 0;
+}
+
+static void free_disk_sb (mdk_rdev_t * rdev)
+{
+	if (rdev->sb) {
+		free_page((unsigned long) rdev->sb);
+		rdev->sb = NULL;
+		rdev->sb_offset = 0;
+		rdev->size = 0;
+	} else {
+		if (!rdev->faulty)
+			MD_BUG();
+	}
+}
+
+static void mark_rdev_faulty (mdk_rdev_t * rdev)
+{
+	if (!rdev) {
+		MD_BUG();
+		return;
+	}
+	free_disk_sb(rdev);
+	rdev->faulty = 1;
+}
+
+static int read_disk_sb (mdk_rdev_t * rdev)
+{
+	int ret = -EINVAL;
+	struct buffer_head *bh = NULL;
 	kdev_t dev = rdev->dev;
-	md_superblock_t *sb;
+	mdp_super_t *sb;
+	u32 sb_offset;
 
+	if (!rdev->sb) {
+		MD_BUG();
+		goto abort;
+	}	
+	
 	/*
-	 * Read the superblock, it's at the end of the disk
+	 * Calculate the position of the superblock,
+	 * it's at the end of the disk
 	 */
-	rdev->sb_offset = MD_NEW_SIZE_BLOCKS (blk_size[MAJOR(dev)][MINOR(dev)]);
+	sb_offset = calc_dev_sboffset(rdev->dev, rdev->mddev, 1);
+	rdev->sb_offset = sb_offset;
+	printk("(read) %s's sb offset: %d", partition_name(dev),
+							 sb_offset);
+	fsync_dev(dev);
 	set_blocksize (dev, MD_SB_BYTES);
-	bh = bread (dev, rdev->sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
+	bh = bread (dev, sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
 
 	if (bh) {
-		sb = (md_superblock_t *) bh->b_data;
-		if (sb->md_magic != MD_SB_MAGIC) {
-			printk (BAD_MAGIC, kdevname(dev),
-					 sb->md_magic, rdev->sb_offset);
-			goto abort;
-		}
-		rdev->sb = (md_superblock_t *) __get_free_page(GFP_KERNEL);
-		if (!rdev->sb) {
-			printk (OUT_OF_MEM);
-			goto abort;
-		}
-		memcpy (rdev->sb, bh->b_data, MD_SB_BYTES);
-
-		rdev->size = sb->size;
-	} else
-		printk (NO_DEVICE,kdevname(rdev->dev));
-	ret = SUCCESS;
+		sb = (mdp_super_t *) bh->b_data;
+		memcpy (rdev->sb, sb, MD_SB_BYTES);
+	} else {
+		printk (NO_SB,partition_name(rdev->dev));
+		goto abort;
+	}
+	printk(" [events: %08lx]\n", (unsigned long)get_unaligned(&rdev->sb->events));
+	ret = 0;
 abort:
 	if (bh)
 		brelse (bh);
 	return ret;
 }
 
-#undef SUCCESS
-#undef FAILURE
+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;
+}
+
+/*
+ * Check one RAID superblock for generic plausibility
+ */
+
+static int check_disk_sb (mdk_rdev_t * rdev)
+{
+	mdp_super_t *sb;
+	int ret = -EINVAL;
 
+	sb = rdev->sb;
+	if (!sb) {
+		MD_BUG();
+		goto abort;
+	}
+
+	if (sb->md_magic != MD_SB_MAGIC) {
+		printk (BAD_MAGIC, partition_name(rdev->dev));
+		goto abort;
+	}
+
+	if (sb->md_minor >= MAX_MD_DEVS) {
+		printk (BAD_MINOR, partition_name(rdev->dev),
+							sb->md_minor);
+		goto abort;
+	}
+
+	if (calc_sb_csum(sb) != sb->sb_csum)
+		printk(BAD_CSUM, partition_name(rdev->dev));
+	ret = 0;
+abort:
+	return ret;
+}
+
+static kdev_t dev_unit(kdev_t dev)
+{
+	unsigned int mask;
+	struct gendisk *hd = find_gendisk(dev);
+
+	if (!hd)
+		return 0;
+	mask = ~((1 << hd->minor_shift) - 1);
+
+	return MKDEV(MAJOR(dev), MINOR(dev) & mask);
+}
+
+static mdk_rdev_t * match_dev_unit(mddev_t *mddev, kdev_t dev)
+{
+	struct md_list_head *tmp;
+	mdk_rdev_t *rdev;
+
+	ITERATE_RDEV(mddev,rdev,tmp)
+		if (dev_unit(rdev->dev) == dev_unit(dev))
+			return rdev;
+
+	return NULL;
+}
+
+static MD_LIST_HEAD(all_raid_disks);
+static MD_LIST_HEAD(pending_raid_disks);
+
+static void bind_rdev_to_array (mdk_rdev_t * rdev, mddev_t * mddev)
+{
+	mdk_rdev_t *same_pdev;
+
+	if (rdev->mddev) {
+		MD_BUG();
+		return;
+	}
+	same_pdev = match_dev_unit(mddev, rdev->dev);
+	if (same_pdev)
+		printk( KERN_WARNING
+"md%d: WARNING: %s appears to be on the same physical disk as %s. True\n"
+"     protection against single-disk failure might be compromised.\n",
+ 			mdidx(mddev), partition_name(rdev->dev),
+				partition_name(same_pdev->dev));
+		
+	md_list_add(&rdev->same_set, &mddev->disks);
+	rdev->mddev = mddev;
+	mddev->nb_dev++;
+	printk("bind<%s,%d>\n", partition_name(rdev->dev), mddev->nb_dev);
+}
+
+static void unbind_rdev_from_array (mdk_rdev_t * rdev)
+{
+	if (!rdev->mddev) {
+		MD_BUG();
+		return;
+	}
+	md_list_del(&rdev->same_set);
+	MD_INIT_LIST_HEAD(&rdev->same_set);
+	rdev->mddev->nb_dev--;
+	printk("unbind<%s,%d>\n", partition_name(rdev->dev),
+						 rdev->mddev->nb_dev);
+	rdev->mddev = NULL;
+}
+
+/*
+ * prevent the device from being mounted, repartitioned or
+ * otherwise reused by a RAID array (or any other kernel
+ * subsystem), by opening the device. [simply getting an
+ * inode is not enough, the SCSI module usage code needs
+ * an explicit open() on the device]
+ */
+static int lock_rdev (mdk_rdev_t *rdev)
+{
+	int err = 0;
+
+	/*
+	 * First insert a dummy inode.
+	 */
+	if (rdev->inode)
+		MD_BUG();
+	rdev->inode = get_empty_inode();
+	if (!rdev->inode)
+		return -ENOMEM;
+ 	/*
+	 * we dont care about any other fields
+	 */
+	rdev->inode->i_dev = rdev->inode->i_rdev = rdev->dev;
+	insert_inode_hash(rdev->inode);
+
+	memset(&rdev->filp, 0, sizeof(rdev->filp));
+	rdev->filp.f_mode = 3; /* read write */
+	return err;
+}
+
+static void unlock_rdev (mdk_rdev_t *rdev)
+{
+	if (!rdev->inode)
+		MD_BUG();
+	iput(rdev->inode);
+	rdev->inode = NULL;
+}
+
+static void export_rdev (mdk_rdev_t * rdev)
+{
+	printk("export_rdev(%s)\n",partition_name(rdev->dev));
+	if (rdev->mddev)
+		MD_BUG();
+	unlock_rdev(rdev);
+	free_disk_sb(rdev);
+	md_list_del(&rdev->all);
+	MD_INIT_LIST_HEAD(&rdev->all);
+	if (rdev->pending.next != &rdev->pending) {
+		printk("(%s was pending)\n",partition_name(rdev->dev));
+		md_list_del(&rdev->pending);
+		MD_INIT_LIST_HEAD(&rdev->pending);
+	}
+	rdev->dev = 0;
+	rdev->faulty = 0;
+	kfree(rdev);
+}
+
+static void kick_rdev_from_array (mdk_rdev_t * rdev)
+{
+	unbind_rdev_from_array(rdev);
+	export_rdev(rdev);
+}
+
+static void export_array (mddev_t *mddev)
+{
+	struct md_list_head *tmp;
+	mdk_rdev_t *rdev;
+	mdp_super_t *sb = mddev->sb;
+
+	if (mddev->sb) {
+		mddev->sb = NULL;
+		free_page((unsigned long) sb);
+	}
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (!rdev->mddev) {
+			MD_BUG();
+			continue;
+		}
+		kick_rdev_from_array(rdev);
+	}
+	if (mddev->nb_dev)
+		MD_BUG();
+}
+
+#undef BAD_CSUM
 #undef BAD_MAGIC
 #undef OUT_OF_MEM
-#undef NO_DEVICE
+#undef NO_SB
+
+static void print_desc(mdp_disk_t *desc)
+{
+	printk(" DISK<N:%d,%s(%d,%d),R:%d,S:%d>\n", desc->number,
+		partition_name(MKDEV(desc->major,desc->minor)),
+		desc->major,desc->minor,desc->raid_disk,desc->state);
+}
+
+static void print_sb(mdp_super_t *sb)
+{
+	int i;
+
+	printk("  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("     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("     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)get_unaligned(&sb->events));
+
+	for (i = 0; i < MD_SB_DISKS; i++) {
+		mdp_disk_t *desc;
+
+		desc = sb->disks + i;
+		printk("     D %2d: ", i);
+		print_desc(desc);
+	}
+	printk("     THIS: ");
+	print_desc(&sb->this_disk);
+
+}
+
+static void print_rdev(mdk_rdev_t *rdev)
+{
+	printk(" rdev %s: O:%s, SZ:%08d F:%d DN:%d ",
+		partition_name(rdev->dev), partition_name(rdev->old_dev),
+		rdev->size, rdev->faulty, rdev->desc_nr);
+	if (rdev->sb) {
+		printk("rdev superblock:\n");
+		print_sb(rdev->sb);
+	} else
+		printk("no rdev superblock!\n");
+}
+
+void md_print_devices (void)
+{
+	struct md_list_head *tmp, *tmp2;
+	mdk_rdev_t *rdev;
+	mddev_t *mddev;
+
+	printk("\n");
+	printk("       **********************************\n");
+	printk("       * <COMPLETE RAID STATE PRINTOUT> *\n");
+	printk("       **********************************\n");
+	ITERATE_MDDEV(mddev,tmp) {
+		printk("md%d: ", mdidx(mddev));
+
+		ITERATE_RDEV(mddev,rdev,tmp2)
+			printk("<%s>", partition_name(rdev->dev));
+
+		if (mddev->sb) {
+			printk(" array superblock:\n");
+			print_sb(mddev->sb);
+		} else
+			printk(" no array superblock.\n");
+
+		ITERATE_RDEV(mddev,rdev,tmp2)
+			print_rdev(rdev);
+	}
+	printk("       **********************************\n");
+	printk("\n");
+}
+
+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;
+		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:
+	if (tmp1)
+		kfree(tmp1);
+	if (tmp2)
+		kfree(tmp2);
+
+	return ret;
+}
+
+static int uuid_equal(mdk_rdev_t *rdev1, mdk_rdev_t *rdev2)
+{
+	if (	(rdev1->sb->set_uuid0 == rdev2->sb->set_uuid0) &&
+		(rdev1->sb->set_uuid1 == rdev2->sb->set_uuid1) &&
+		(rdev1->sb->set_uuid2 == rdev2->sb->set_uuid2) &&
+		(rdev1->sb->set_uuid3 == rdev2->sb->set_uuid3))
+
+		return 1;
+
+	return 0;
+}
+
+static mdk_rdev_t * find_rdev_all (kdev_t dev)
+{
+	struct md_list_head *tmp;
+	mdk_rdev_t *rdev;
+
+	tmp = all_raid_disks.next;
+	while (tmp != &all_raid_disks) {
+		rdev = md_list_entry(tmp, mdk_rdev_t, all);
+		if (rdev->dev == dev)
+			return rdev;
+		tmp = tmp->next;
+	}
+	return NULL;
+}
+
+#define GETBLK_FAILED KERN_ERR \
+"md: getblk failed for device %s\n"
+
+static int write_disk_sb(mdk_rdev_t * rdev)
+{
+	struct buffer_head *bh;
+	kdev_t dev;
+	u32 sb_offset, size;
+	mdp_super_t *sb;
+
+	if (!rdev->sb) {
+		MD_BUG();
+		return -1;
+	}
+	if (rdev->faulty) {
+		MD_BUG();
+		return -1;
+	}
+	if (rdev->sb->md_magic != MD_SB_MAGIC) {
+		MD_BUG();
+		return -1;
+	}
+
+	dev = rdev->dev;
+	sb_offset = calc_dev_sboffset(dev, rdev->mddev, 1);
+	if (rdev->sb_offset != sb_offset) {
+		printk("%s's sb offset has changed from %d to %d, skipping\n", partition_name(dev), rdev->sb_offset, sb_offset);
+		goto skip;
+	}
+	/*
+	 * If the disk went offline meanwhile and it's just a spare, then
+	 * it's size has changed to zero silently, and the MD code does
+	 * not yet know that it's faulty.
+	 */
+	size = calc_dev_size(dev, rdev->mddev, 1);
+	if (size != rdev->size) {
+		printk("%s's size has changed from %d to %d since import, skipping\n", partition_name(dev), rdev->size, size);
+		goto skip;
+	}
+
+	printk("(write) %s's sb offset: %d\n", partition_name(dev), sb_offset);
+	fsync_dev(dev);
+	set_blocksize(dev, MD_SB_BYTES);
+	bh = getblk(dev, sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
+	if (!bh) {
+		printk(GETBLK_FAILED, partition_name(dev));
+		return 1;
+	}
+	memset(bh->b_data,0,bh->b_size);
+	sb = (mdp_super_t *) bh->b_data;
+	memcpy(sb, rdev->sb, MD_SB_BYTES);
+
+	mark_buffer_uptodate(bh, 1);
+	mark_buffer_dirty(bh, 1);
+	ll_rw_block(WRITE, 1, &bh);
+	wait_on_buffer(bh);
+	brelse(bh);
+	fsync_dev(dev);
+skip:
+	return 0;
+}
+#undef GETBLK_FAILED KERN_ERR
+
+static void set_this_disk(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+	int i, ok = 0;
+	mdp_disk_t *desc;
+
+	for (i = 0; i < MD_SB_DISKS; i++) {
+		desc = mddev->sb->disks + i;
+#if 0
+		if (disk_faulty(desc)) {
+			if (MKDEV(desc->major,desc->minor) == rdev->dev)
+				ok = 1;
+			continue;
+		}
+#endif
+		if (MKDEV(desc->major,desc->minor) == rdev->dev) {
+			rdev->sb->this_disk = *desc;
+			rdev->desc_nr = desc->number;
+			ok = 1;
+			break;
+		}
+	}
+
+	if (!ok) {
+		MD_BUG();
+	}
+}
+
+static int sync_sbs(mddev_t * mddev)
+{
+	mdk_rdev_t *rdev;
+	mdp_super_t *sb;
+	struct md_list_head *tmp;
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev->faulty)
+			continue;
+		sb = rdev->sb;
+		*sb = *mddev->sb;
+		set_this_disk(mddev, rdev);
+		sb->sb_csum = calc_sb_csum(sb);
+	}
+	return 0;
+}
+
+int md_update_sb(mddev_t * mddev)
+{
+	int first, err, count = 100;
+	struct md_list_head *tmp;
+	mdk_rdev_t *rdev;
+	__u64 ev;
+
+repeat:
+	mddev->sb->utime = CURRENT_TIME;
+	ev = get_unaligned(&mddev->sb->events);
+	++ev;
+	put_unaligned(ev,&mddev->sb->events);
+	if (ev == (__u64)0) {
+		/*
+		 * 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();
+		--ev;
+		put_unaligned(ev,&mddev->sb->events);
+	}
+	sync_sbs(mddev);
+
+	/*
+	 * do not write anything to disk if using
+	 * nonpersistent superblocks
+	 */
+	if (mddev->sb->not_persistent)
+		return 0;
+
+	printk(KERN_INFO "md: updating md%d RAID superblock on device\n",
+					mdidx(mddev));
+
+	first = 1;
+	err = 0;
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (!first) {
+			first = 0;
+			printk(", ");
+		}
+		if (rdev->faulty)
+			printk("(skipping faulty ");
+		printk("%s ", partition_name(rdev->dev));
+		if (!rdev->faulty) {
+			printk("[events: %08lx]",
+			       (unsigned long)get_unaligned(&rdev->sb->events));
+			err += write_disk_sb(rdev);
+		} else
+			printk(")\n");
+	}
+	printk(".\n");
+	if (err) {
+		printk("errors occured during superblock update, repeating\n");
+		if (--count)
+			goto repeat;
+		printk("excessive errors occured during superblock update, exiting\n");
+	}
+	return 0;
+}
+
+/*
+ * Import a device. If 'on_disk', 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 int md_import_device (kdev_t newdev, int on_disk)
+{
+	int err;
+	mdk_rdev_t *rdev;
+	unsigned int size;
+
+	if (find_rdev_all(newdev))
+		return -EEXIST;
+
+	rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL);
+	if (!rdev) {
+		printk("could not alloc mem for %s!\n", partition_name(newdev));
+		return -ENOMEM;
+	}
+	memset(rdev, 0, sizeof(*rdev));
+
+	if (!fs_may_mount(newdev)) {
+		printk("md: can not import %s, has active inodes!\n",
+			partition_name(newdev));
+		err = -EBUSY;
+		goto abort_free;
+	}
+
+	if ((err = alloc_disk_sb(rdev)))
+		goto abort_free;
+
+	rdev->dev = newdev;
+	if (lock_rdev(rdev)) {
+		printk("md: could not lock %s, zero-size? Marking faulty.\n",
+			partition_name(newdev));
+		err = -EINVAL;
+		goto abort_free;
+	}
+	rdev->desc_nr = -1;
+	rdev->faulty = 0;
+
+	size = 0;
+	if (blk_size[MAJOR(newdev)])
+		size = blk_size[MAJOR(newdev)][MINOR(newdev)];
+	if (!size) {
+		printk("md: %s has zero size, marking faulty!\n",
+				partition_name(newdev));
+		err = -EINVAL;
+		goto abort_free;
+	}
+
+	if (on_disk) {
+		if ((err = read_disk_sb(rdev))) {
+			printk("md: could not read %s's sb, not importing!\n",
+					partition_name(newdev));
+			goto abort_free;
+		}
+		if ((err = check_disk_sb(rdev))) {
+			printk("md: %s has invalid sb, not importing!\n",
+					partition_name(newdev));
+			goto abort_free;
+		}
+
+		rdev->old_dev = MKDEV(rdev->sb->this_disk.major,
+					rdev->sb->this_disk.minor);
+		rdev->desc_nr = rdev->sb->this_disk.number;
+	}
+	md_list_add(&rdev->all, &all_raid_disks);
+	MD_INIT_LIST_HEAD(&rdev->pending);
+
+	if (rdev->faulty && rdev->sb)
+		free_disk_sb(rdev);
+	return 0;
+
+abort_free:
+	if (rdev->sb) {
+		if (rdev->inode)
+			unlock_rdev(rdev);
+		free_disk_sb(rdev);
+	}
+	kfree(rdev);
+	return err;
+}
 
 /*
  * Check a full RAID array for plausibility
  */
 
 #define INCONSISTENT KERN_ERR \
-"md: superblock inconsistency -- run ckraid\n"
+"md: fatal superblock inconsistency in %s -- removing from array\n"
 
 #define OUT_OF_DATE KERN_ERR \
-"md: superblock update time inconsistenty -- using the most recent one\n"
+"md: superblock update time inconsistency -- using the most recent one\n"
 
 #define OLD_VERSION KERN_ALERT \
-"md: %s: unsupported raid array version %d.%d.%d\n"
-
-#define NOT_CLEAN KERN_ERR \
-"md: %s: raid array is not clean -- run ckraid\n"
+"md: md%d: unsupported raid array version %d.%d.%d\n"
 
 #define NOT_CLEAN_IGNORE KERN_ERR \
-"md: %s: raid array is not clean -- reconstructing parity\n"
+"md: md%d: raid array is not clean -- starting background reconstruction\n"
 
 #define UNKNOWN_LEVEL KERN_ERR \
-"md: %s: unsupported raid level %d\n"
+"md: md%d: unsupported raid level %d\n"
 
-static int analyze_sbs (int minor, int pnum)
+static int analyze_sbs (mddev_t * mddev)
 {
-	struct md_dev *mddev = md_dev + minor;
-	int i, N = mddev->nb_dev, out_of_date = 0;
-	struct real_dev * disks = mddev->devices;
-	md_superblock_t *sb, *freshest = NULL;
-
-	/*
-	 * RAID-0 and linear don't use a RAID superblock
-	 */
-	if (pnum == RAID0 >> PERSONALITY_SHIFT ||
-		pnum == LINEAR >> PERSONALITY_SHIFT)
-			return legacy_raid_sb (minor, pnum);
+	int out_of_date = 0, i;
+	struct md_list_head *tmp, *tmp2;
+	mdk_rdev_t *rdev, *rdev2, *freshest;
+	mdp_super_t *sb;
 
 	/*
 	 * Verify the RAID superblock on each real device
 	 */
-	for (i = 0; i < N; i++)
-		if (analyze_one_sb(disks+i))
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev->faulty) {
+			MD_BUG();
 			goto abort;
+		}
+		if (!rdev->sb) {
+			MD_BUG();
+			goto abort;
+		}
+		if (check_disk_sb(rdev))
+			goto abort;
+	}
 
 	/*
 	 * The superblock constant part has to be the same
 	 * for all disks in the array.
 	 */
 	sb = NULL;
-	for (i = 0; i < N; i++) {
-		if (!disks[i].sb)
-			continue;
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
 		if (!sb) {
-			sb = disks[i].sb;
+			sb = rdev->sb;
 			continue;
 		}
-		if (memcmp(sb,
-			   disks[i].sb, MD_SB_GENERIC_CONSTANT_WORDS * 4)) {
-			printk (INCONSISTENT);
-			goto abort;
+		if (!sb_equal(sb, rdev->sb)) {
+			printk (INCONSISTENT, partition_name(rdev->dev));
+			kick_rdev_from_array(rdev);
+			continue;
 		}
 	}
 
@@ -261,496 +1217,1662 @@ static int analyze_sbs (int minor, int pnum)
 	 * find the freshest superblock, that one will be the superblock
 	 * that represents the whole array.
 	 */
-	if ((sb = mddev->sb = (md_superblock_t *) __get_free_page (GFP_KERNEL)) == NULL)
-		goto abort;
+	if (!mddev->sb)
+		if (alloc_array_sb(mddev))
+			goto abort;
+	sb = mddev->sb;
 	freshest = NULL;
-	for (i = 0; i < N; i++) {
-		if (!disks[i].sb)
-			continue;
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		__u64 ev1, ev2;
+		/*
+		 * if the checksum is invalid, use the superblock
+		 * only as a last resort. (decrease it's age by
+		 * one event)
+		 */
+		if (calc_sb_csum(rdev->sb) != rdev->sb->sb_csum) {
+			__u64 ev = get_unaligned(&rdev->sb->events);
+			if (ev != (__u64)0) {
+				--ev;
+				put_unaligned(ev,&rdev->sb->events);
+			}
+		}
+
+		printk("%s's event counter: %08lx\n", partition_name(rdev->dev),
+		       (unsigned long)get_unaligned(&rdev->sb->events));
 		if (!freshest) {
-			freshest = disks[i].sb;
+			freshest = rdev;
 			continue;
 		}
 		/*
 		 * Find the newest superblock version
 		 */
-		if (disks[i].sb->utime != freshest->utime) {
+		ev1 = get_unaligned(&rdev->sb->events);
+		ev2 = get_unaligned(&freshest->sb->events);
+		if (ev1 != ev2) {
 			out_of_date = 1;
-			if (disks[i].sb->utime > freshest->utime)
-				freshest = disks[i].sb;
+			if (ev1 > ev2)
+				freshest = rdev;
 		}
 	}
-	if (out_of_date)
+	if (out_of_date) {
 		printk(OUT_OF_DATE);
-	memcpy (sb, freshest, sizeof(*freshest));
+		printk("freshest: %s\n", partition_name(freshest->dev));
+	}
+	memcpy (sb, freshest->sb, sizeof(*sb));
 
 	/*
-	 * Check if we can support this RAID array
+	 * at this point we have picked the 'best' superblock
+	 * from all available superblocks.
+	 * now we validate this superblock and kick out possibly
+	 * failed disks.
 	 */
-	if (sb->major_version != MD_MAJOR_VERSION ||
-			sb->minor_version > MD_MINOR_VERSION) {
-
-		printk (OLD_VERSION, kdevname(MKDEV(MD_MAJOR, minor)),
-				sb->major_version, sb->minor_version,
-				sb->patch_version);
-		goto abort;
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		/*
+		 * Kick all non-fresh devices faulty
+		 */
+		__u64 ev1, ev2;
+		ev1 = get_unaligned(&rdev->sb->events);
+		ev2 = get_unaligned(&sb->events);
+		++ev1;
+		if (ev1 < ev2) {
+			printk("md: kicking non-fresh %s from array!\n",
+						partition_name(rdev->dev));
+			kick_rdev_from_array(rdev);
+			continue;
+		}
 	}
 
 	/*
-	 * We need to add this as a superblock option.
+	 * Fix up changed device names ... but only if this disk has a
+	 * recent update time. Use faulty checksum ones too.
 	 */
-#if SUPPORT_RECONSTRUCTION
-	if (sb->state != (1 << MD_SB_CLEAN)) {
-		if (sb->level == 1) {
-			printk (NOT_CLEAN, kdevname(MKDEV(MD_MAJOR, minor)));
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		__u64 ev1, ev2, ev3;
+		if (rdev->faulty) { /* REMOVEME */
+			MD_BUG();
 			goto abort;
-		} else
-			printk (NOT_CLEAN_IGNORE, kdevname(MKDEV(MD_MAJOR, minor)));
+		}
+		ev1 = get_unaligned(&rdev->sb->events);
+		ev2 = get_unaligned(&sb->events);
+		ev3 = ev2;
+		--ev3;
+		if ((rdev->dev != rdev->old_dev) &&
+		    ((ev1 == ev2) || (ev1 == ev3))) {
+			mdp_disk_t *desc;
+
+			printk("md: device name has changed from %s to %s since last import!\n", partition_name(rdev->old_dev), partition_name(rdev->dev));
+			if (rdev->desc_nr == -1) {
+				MD_BUG();
+				goto abort;
+			}
+			desc = &sb->disks[rdev->desc_nr];
+			if (rdev->old_dev != MKDEV(desc->major, desc->minor)) {
+				MD_BUG();
+				goto abort;
+			}
+			desc->major = MAJOR(rdev->dev);
+			desc->minor = MINOR(rdev->dev);
+			desc = &rdev->sb->this_disk;
+			desc->major = MAJOR(rdev->dev);
+			desc->minor = MINOR(rdev->dev);
+		}
 	}
-#else
-	if (sb->state != (1 << MD_SB_CLEAN)) {
-		printk (NOT_CLEAN, kdevname(MKDEV(MD_MAJOR, minor)));
-		goto abort;
+
+	/*
+	 * Remove unavailable and faulty devices ...
+	 *
+	 * note that if an array becomes completely unrunnable due to
+	 * missing devices, we do not write the superblock back, so the
+	 * administrator has a chance to fix things up. The removal thus
+	 * only happens if it's nonfatal to the contents of the array.
+	 */
+	for (i = 0; i < MD_SB_DISKS; i++) {
+		int found;
+		mdp_disk_t *desc;
+		kdev_t dev;
+
+		desc = sb->disks + i;
+		dev = MKDEV(desc->major, desc->minor);
+
+		/*
+		 * We kick faulty devices/descriptors immediately.
+		 */
+		if (disk_faulty(desc)) {
+			found = 0;
+			ITERATE_RDEV(mddev,rdev,tmp) {
+				if (rdev->desc_nr != desc->number)
+					continue;
+				printk("md%d: kicking faulty %s!\n",
+					mdidx(mddev),partition_name(rdev->dev));
+				kick_rdev_from_array(rdev);
+				found = 1;
+				break;
+			}
+			if (!found) {
+				if (dev == MKDEV(0,0))
+					continue;
+				printk("md%d: removing former faulty %s!\n",
+					mdidx(mddev), partition_name(dev));
+			}
+			remove_descriptor(desc, sb);
+			continue;
+		}
+
+		if (dev == MKDEV(0,0))
+			continue;
+		/*
+		 * Is this device present in the rdev ring?
+		 */
+		found = 0;
+		ITERATE_RDEV(mddev,rdev,tmp) {
+			if (rdev->desc_nr == desc->number) {
+				found = 1;
+				break;
+			}
+		}
+		if (found) 
+			continue;
+
+		printk("md%d: former device %s is unavailable, removing from array!\n", mdidx(mddev), partition_name(dev));
+		remove_descriptor(desc, sb);
 	}
-#endif /* SUPPORT_RECONSTRUCTION */
 
-	switch (sb->level) {
-		case 1:
-			md_size[minor] = sb->size;
-			md_maxreadahead[minor] = MD_DEFAULT_DISK_READAHEAD;
-			break;
-		case 4:
-		case 5:
-			md_size[minor] = sb->size * (sb->raid_disks - 1);
-			md_maxreadahead[minor] = MD_DEFAULT_DISK_READAHEAD * (sb->raid_disks - 1);
-			break;
-		default:
-			printk (UNKNOWN_LEVEL, kdevname(MKDEV(MD_MAJOR, minor)),
-					sb->level);
+	/*
+	 * Double check wether all devices mentioned in the
+	 * superblock are in the rdev ring.
+	 */
+	for (i = 0; i < MD_SB_DISKS; i++) {
+		mdp_disk_t *desc;
+		kdev_t dev;
+
+		desc = sb->disks + i;
+		dev = MKDEV(desc->major, desc->minor);
+
+		if (dev == MKDEV(0,0))
+			continue;
+
+		if (disk_faulty(desc)) {
+			MD_BUG();
 			goto abort;
+		}
+
+		rdev = find_rdev(mddev, dev);
+		if (!rdev) {
+			MD_BUG();
+			goto abort;
+		}
 	}
+
+	/*
+	 * Do a final reality check.
+	 */
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev->desc_nr == -1) {
+			MD_BUG();
+			goto abort;
+		}
+		/*
+		 * is the desc_nr unique?
+		 */
+		ITERATE_RDEV(mddev,rdev2,tmp2) {
+			if ((rdev2 != rdev) &&
+					(rdev2->desc_nr == rdev->desc_nr)) {
+				MD_BUG();
+				goto abort;
+			}
+		}
+		/*
+		 * is the device unique?
+		 */
+		ITERATE_RDEV(mddev,rdev2,tmp2) {
+			if ((rdev2 != rdev) &&
+					(rdev2->dev == rdev->dev)) {
+				MD_BUG();
+				goto abort;
+			}
+		}
+	}
+
+	/*
+	 * Check if we can support this RAID array
+	 */
+	if (sb->major_version != MD_MAJOR_VERSION ||
+			sb->minor_version > MD_MINOR_VERSION) {
+
+		printk (OLD_VERSION, mdidx(mddev), sb->major_version,
+				sb->minor_version, sb->patch_version);
+		goto abort;
+	}
+
+	if ((sb->state != (1 << MD_SB_CLEAN)) && ((sb->level == 1) ||
+			(sb->level == 4) || (sb->level == 5)))
+		printk (NOT_CLEAN_IGNORE, mdidx(mddev));
+
 	return 0;
 abort:
-	free_sb(mddev);
 	return 1;
 }
 
 #undef INCONSISTENT
 #undef OUT_OF_DATE
 #undef OLD_VERSION
-#undef NOT_CLEAN
 #undef OLD_LEVEL
 
-int md_update_sb(int minor)
+static int device_size_calculation (mddev_t * mddev)
 {
-	struct md_dev *mddev = md_dev + minor;
-	struct buffer_head *bh;
-	md_superblock_t *sb = mddev->sb;
-	struct real_dev *realdev;
-	kdev_t dev;
-	int i;
-	u32 sb_offset;
+	int data_disks = 0, persistent;
+	unsigned int readahead;
+	mdp_super_t *sb = mddev->sb;
+	struct md_list_head *tmp;
+	mdk_rdev_t *rdev;
 
-	sb->utime = CURRENT_TIME;
-	for (i = 0; i < mddev->nb_dev; i++) {
-		realdev = mddev->devices + i;
-		if (!realdev->sb)
+	/*
+	 * Do device size calculation. Bail out if too small.
+	 * (we have to do this after having validated chunk_size,
+	 * because device size has to be modulo chunk_size)
+	 */ 
+	persistent = !mddev->sb->not_persistent;
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev->faulty)
 			continue;
-		dev = realdev->dev;
-		sb_offset = realdev->sb_offset;
-		set_blocksize(dev, MD_SB_BYTES);
-		printk("md: updating raid superblock on device %s, sb_offset == %u\n", kdevname(dev), sb_offset);
-		bh = getblk(dev, sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
-		if (bh) {
-			sb = (md_superblock_t *) bh->b_data;
-			memcpy(sb, mddev->sb, MD_SB_BYTES);
-			memcpy(&sb->descriptor, sb->disks + realdev->sb->descriptor.number, MD_SB_DESCRIPTOR_WORDS * 4);
-			mark_buffer_uptodate(bh, 1);
-			mark_buffer_dirty(bh, 1);
-			ll_rw_block(WRITE, 1, &bh);
-			wait_on_buffer(bh);
-			bforget(bh);
-			fsync_dev(dev);
-			invalidate_buffers(dev);
-		} else
-			printk(KERN_ERR "md: getblk failed for device %s\n", kdevname(dev));
+		if (rdev->size) {
+			MD_BUG();
+			continue;
+		}
+		rdev->size = calc_dev_size(rdev->dev, mddev, persistent);
+		if (rdev->size < sb->chunk_size / 1024) {
+			printk (KERN_WARNING
+				"Dev %s smaller than chunk_size: %dk < %dk\n",
+				partition_name(rdev->dev),
+				rdev->size, sb->chunk_size / 1024);
+			return -EINVAL;
+		}
 	}
+
+	switch (sb->level) {
+		case -3:
+			data_disks = 1;
+			break;
+		case -2:
+			data_disks = 1;
+			break;
+		case -1:
+			zoned_raid_size(mddev);
+			data_disks = 1;
+			break;
+		case 0:
+			zoned_raid_size(mddev);
+			data_disks = sb->raid_disks;
+			break;
+		case 1:
+			data_disks = 1;
+			break;
+		case 4:
+		case 5:
+			data_disks = sb->raid_disks-1;
+			break;
+		default:
+			printk (UNKNOWN_LEVEL, mdidx(mddev), sb->level);
+			goto abort;
+	}
+	if (!md_size[mdidx(mddev)])
+		md_size[mdidx(mddev)] = sb->size * data_disks;
+
+	readahead = MD_READAHEAD;
+	if ((sb->level == 0) || (sb->level == 4) || (sb->level == 5))
+		readahead = mddev->sb->chunk_size * 4 * data_disks;
+		if (readahead < data_disks * MAX_SECTORS*512*2) 
+			readahead = data_disks * MAX_SECTORS*512*2;
+	else {
+		if (sb->level == -3)
+			readahead = 0;
+	}
+	md_maxreadahead[mdidx(mddev)] = readahead;
+
+	printk(KERN_INFO "md%d: max total readahead window set to %dk\n",
+		mdidx(mddev), readahead/1024);
+
+	printk(KERN_INFO
+		"md%d: %d data-disks, max readahead per data-disk: %dk\n",
+			mdidx(mddev), data_disks, readahead/data_disks/1024);
 	return 0;
+abort:
+	return 1;
 }
 
-static int do_md_run (int minor, int repart)
+
+#define TOO_BIG_CHUNKSIZE KERN_ERR \
+"too big chunk_size: %d > %d\n"
+
+#define TOO_SMALL_CHUNKSIZE KERN_ERR \
+"too small chunk_size: %d < %ld\n"
+
+#define BAD_CHUNKSIZE KERN_ERR \
+"no chunksize specified, see 'man raidtab'\n"
+
+static int do_md_run (mddev_t * mddev)
 {
-  int pnum, i, min, factor, err;
+	int pnum, err;
+	int chunk_size;
+	struct md_list_head *tmp;
+	mdk_rdev_t *rdev;
 
-  if (!md_dev[minor].nb_dev)
-    return -EINVAL;
-  
-  if (md_dev[minor].pers)
-    return -EBUSY;
 
-  md_dev[minor].repartition=repart;
+	if (!mddev->nb_dev) {
+		MD_BUG();
+		return -EINVAL;
+	}
   
-  if ((pnum=PERSONALITY(&md_dev[minor]) >> (PERSONALITY_SHIFT))
-      >= MAX_PERSONALITY)
-    return -EINVAL;
-
-  /* Only RAID-1 and RAID-5 can have MD devices as underlying devices */
-  if (pnum != (RAID1 >> PERSONALITY_SHIFT) && pnum != (RAID5 >> PERSONALITY_SHIFT)){
-	  for (i = 0; i < md_dev [minor].nb_dev; i++)
-		  if (MAJOR (md_dev [minor].devices [i].dev) == MD_MAJOR)
-			  return -EINVAL;
-  }
-  if (!pers[pnum])
-  {
+	if (mddev->pers)
+		return -EBUSY;
+
+	/*
+	 * Resize disks to align partitions size on a given
+	 * chunk size.
+	 */
+	md_size[mdidx(mddev)] = 0;
+
+	/*
+	 * Analyze all RAID superblock(s)
+	 */ 
+	if (analyze_sbs(mddev)) {
+		MD_BUG();
+		return -EINVAL;
+	}
+
+	chunk_size = mddev->sb->chunk_size;
+	pnum = level_to_pers(mddev->sb->level);
+
+	mddev->param.chunk_size = chunk_size;
+	mddev->param.personality = pnum;
+
+	if (chunk_size > MAX_CHUNK_SIZE) {
+		printk(TOO_BIG_CHUNKSIZE, 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) {
+		MD_BUG();
+		return -EINVAL;
+	}
+	if (chunk_size < PAGE_SIZE) {
+		printk(TOO_SMALL_CHUNKSIZE, chunk_size, PAGE_SIZE);
+		return -EINVAL;
+	}
+
+	if (pnum >= MAX_PERSONALITY) {
+		MD_BUG();
+		return -EINVAL;
+	}
+
+	if ((pnum != RAID1) && (pnum != LINEAR) && !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 dont
+		 * want to continue the bad practice.
+		 */
+		printk(BAD_CHUNKSIZE);
+		return -EINVAL;
+	}
+
+	if (!pers[pnum])
+	{
 #ifdef CONFIG_KMOD
-    char module_name[80];
-    sprintf (module_name, "md-personality-%d", pnum);
-    request_module (module_name);
-    if (!pers[pnum])
+		char module_name[80];
+		sprintf (module_name, "md-personality-%d", pnum);
+		request_module (module_name);
+		if (!pers[pnum])
 #endif
-      return -EINVAL;
-  }
+			return -EINVAL;
+	}
   
-  factor = min = 1 << FACTOR_SHIFT(FACTOR((md_dev+minor)));
+	if (device_size_calculation(mddev))
+		return -EINVAL;
+
+	/*
+	 * Drop all container device buffers, from now on
+	 * the only valid external interface is through the md
+	 * device.
+	 */
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev->faulty)
+			continue;
+		fsync_dev(rdev->dev);
+		invalidate_buffers(rdev->dev);
+	}
   
-  for (i=0; i<md_dev[minor].nb_dev; i++)
-    if (md_dev[minor].devices[i].size<min)
-    {
-      printk ("Dev %s smaller than %dk, cannot shrink\n",
-	      partition_name (md_dev[minor].devices[i].dev), min);
-      return -EINVAL;
-    }
-
-  for (i=0; i<md_dev[minor].nb_dev; i++) {
-    fsync_dev(md_dev[minor].devices[i].dev);
-    invalidate_buffers(md_dev[minor].devices[i].dev);
-  }
+	mddev->pers = pers[pnum];
   
-  /* Resize devices according to the factor. It is used to align
-     partitions size on a given chunk size. */
-  md_size[minor]=0;
+	err = mddev->pers->run(mddev);
+	if (err) {
+		printk("pers->run() failed ...\n");
+		mddev->pers = NULL;
+		return -EINVAL;
+	}
 
-  /*
-   * Analyze the raid superblock
-   */ 
-  if (analyze_sbs(minor, pnum))
-    return -EINVAL;
+	mddev->sb->state &= ~(1 << MD_SB_CLEAN);
+	md_update_sb(mddev);
 
-  md_dev[minor].pers=pers[pnum];
-  
-  if ((err=md_dev[minor].pers->run (minor, md_dev+minor)))
-  {
-    md_dev[minor].pers=NULL;
-    free_sb(md_dev + minor);
-    return (err);
-  }
-
-  if (pnum != RAID0 >> PERSONALITY_SHIFT && pnum != LINEAR >> PERSONALITY_SHIFT)
-  {
-    md_dev[minor].sb->state &= ~(1 << MD_SB_CLEAN);
-    md_update_sb(minor);
-  }
-
-  /* FIXME : We assume here we have blocks
-     that are twice as large as sectors.
-     THIS MAY NOT BE TRUE !!! */
-  md_hd_struct[minor].start_sect=0;
-  md_hd_struct[minor].nr_sects=md_size[minor]<<1;
+	/*
+	 * md_size has units of 1K blocks, which are
+	 * twice as large as sectors.
+	 */
+	md_hd_struct[mdidx(mddev)].start_sect = 0;
+	md_hd_struct[mdidx(mddev)].nr_sects = md_size[mdidx(mddev)] << 1;
   
-  read_ahead[MD_MAJOR] = 128;
-  return (0);
+	read_ahead[MD_MAJOR] = 1024;
+	return (0);
 }
 
-static int do_md_stop (int minor, struct inode *inode)
+#undef TOO_BIG_CHUNKSIZE
+#undef BAD_CHUNKSIZE
+
+#define OUT(x) do { err = (x); goto out; } while (0)
+
+static int restart_array (mddev_t *mddev)
 {
-	int i;
-  
-	if (inode->i_count>1 || md_dev[minor].busy>1) {
+	int err = 0;
+ 
+	/*
+	 * Complain if it has no devices
+	 */
+	if (!mddev->nb_dev)
+		OUT(-ENXIO);
+
+	if (mddev->pers) {
+		if (!mddev->ro)
+			OUT(-EBUSY);
+
+		mddev->ro = 0;
+		set_device_ro(mddev_to_kdev(mddev), 0);
+
+		printk (KERN_INFO
+			"md%d switched to read-write mode.\n", mdidx(mddev));
 		/*
-		 * ioctl : one open channel
+		 * Kick recovery or resync if necessary
 		 */
-		printk ("STOP_MD md%x failed : i_count=%d, busy=%d\n",
-				minor, inode->i_count, md_dev[minor].busy);
-		return -EBUSY;
+		md_recover_arrays();
+		if (mddev->pers->restart_resync)
+			mddev->pers->restart_resync(mddev);
+	} else
+		err = -EINVAL;
+ 
+out:
+	return err;
+}
+
+#define STILL_MOUNTED KERN_WARNING \
+"md: md%d still mounted.\n"
+
+static int do_md_stop (mddev_t * mddev, int ro)
+{
+	int err = 0, resync_interrupted = 0;
+	kdev_t dev = mddev_to_kdev(mddev);
+ 
+	if (!ro && !fs_may_mount (dev)) {
+		printk (STILL_MOUNTED, mdidx(mddev));
+		OUT(-EBUSY);
 	}
   
-	if (md_dev[minor].pers) {
+	/*
+	 * complain if it's already stopped
+	 */
+	if (!mddev->nb_dev)
+		OUT(-ENXIO);
+
+	if (mddev->pers) {
 		/*
 		 * It is safe to call stop here, it only frees private
 		 * data. Also, it tells us if a device is unstoppable
 		 * (eg. resyncing is in progress)
 		 */
-		if (md_dev[minor].pers->stop (minor, md_dev+minor))
-			return -EBUSY;
+		if (mddev->pers->stop_resync)
+			if (mddev->pers->stop_resync(mddev))
+				resync_interrupted = 1;
+
+		if (mddev->recovery_running)
+			md_interrupt_thread(md_recovery_thread);
+
 		/*
-		 *  The device won't exist anymore -> flush it now
+		 * This synchronizes with signal delivery to the
+		 * resync or reconstruction thread. It also nicely
+		 * hangs the process if some reconstruction has not
+		 * finished.
 		 */
-		fsync_dev (inode->i_rdev);
-		invalidate_buffers (inode->i_rdev);
-		if (md_dev[minor].sb) {
-			md_dev[minor].sb->state |= 1 << MD_SB_CLEAN;
-			md_update_sb(minor);
+		down(&mddev->recovery_sem);
+		up(&mddev->recovery_sem);
+
+		/*
+		 *  sync and invalidate buffers because we cannot kill the
+		 *  main thread with valid IO transfers still around.
+		 *  the kernel lock protects us from new requests being
+		 *  added after invalidate_buffers().
+		 */
+		fsync_dev (mddev_to_kdev(mddev));
+		fsync_dev (dev);
+		invalidate_buffers (dev);
+
+		if (ro) {
+			if (mddev->ro)
+				OUT(-ENXIO);
+			mddev->ro = 1;
+		} else {
+			if (mddev->ro)
+				set_device_ro(dev, 0);
+			if (mddev->pers->stop(mddev)) {
+				if (mddev->ro)
+					set_device_ro(dev, 1);
+				OUT(-EBUSY);
+			}
+			if (mddev->ro)
+				mddev->ro = 0;
+		}
+		if (mddev->sb) {
+			/*
+			 * mark it clean only if there was no resync
+			 * interrupted.
+			 */
+			if (!mddev->recovery_running && !resync_interrupted) {
+				printk("marking sb clean...\n");
+				mddev->sb->state |= 1 << MD_SB_CLEAN;
+			}
+			md_update_sb(mddev);
 		}
+		if (ro)
+			set_device_ro(dev, 1);
 	}
-  
-	/* Remove locks. */
-	if (md_dev[minor].sb)
-	free_sb(md_dev + minor);
-	for (i=0; i<md_dev[minor].nb_dev; i++)
-		clear_inode (md_dev[minor].devices[i].inode);
-
-	md_dev[minor].nb_dev=md_size[minor]=0;
-	md_hd_struct[minor].nr_sects=0;
-	md_dev[minor].pers=NULL;
-  
-	read_ahead[MD_MAJOR] = 128;
-  
-	return (0);
+ 
+	/*
+	 * Free resources if final stop
+	 */
+	if (!ro) {
+		export_array(mddev);
+		md_size[mdidx(mddev)] = 0;
+		md_hd_struct[mdidx(mddev)].nr_sects = 0;
+		free_mddev(mddev);
+
+		printk (KERN_INFO "md%d stopped.\n", mdidx(mddev));
+	} else
+		printk (KERN_INFO
+			"md%d switched to read-only mode.\n", mdidx(mddev));
+out:
+	return err;
+}
+
+#undef OUT
+
+/*
+ * We have to safely support old arrays too.
+ */
+int detect_old_array (mdp_super_t *sb)
+{
+	if (sb->major_version > 0)
+		return 0;
+	if (sb->minor_version >= 90)
+		return 0;
+
+	return -EINVAL;
 }
 
-static int do_md_add (int minor, kdev_t dev)
+
+static void autorun_array (mddev_t *mddev)
 {
+	mdk_rdev_t *rdev;
+	struct md_list_head *tmp;
+	int err;
+
+	if (mddev->disks.prev == &mddev->disks) {
+		MD_BUG();
+		return;
+	}
+
+	printk("running: ");
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		printk("<%s>", partition_name(rdev->dev));
+	}
+	printk("\nnow!\n");
+
+	err = do_md_run (mddev);
+	if (err) {
+		printk("do_md_run() returned %d\n", err);
+		/*
+		 * prevent the writeback of an unrunnable array
+		 */
+		mddev->sb_dirty = 0;
+		do_md_stop (mddev, 0);
+	}
+}
+
+/*
+ * lets try to run arrays based on all disks that have arrived
+ * until now. (those are in the ->pending list)
+ *
+ * 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.
+ */
+static void autorun_devices (void)
+{
+	struct md_list_head candidates;
+	struct md_list_head *tmp;
+	mdk_rdev_t *rdev0, *rdev;
+	mddev_t *mddev;
+	kdev_t md_kdev;
+
+
+	printk("autorun ...\n");
+	while (pending_raid_disks.next != &pending_raid_disks) {
+		rdev0 = md_list_entry(pending_raid_disks.next,
+					 mdk_rdev_t, pending);
+
+		printk("considering %s ...\n", partition_name(rdev0->dev));
+		MD_INIT_LIST_HEAD(&candidates);
+		ITERATE_RDEV_PENDING(rdev,tmp) {
+			if (uuid_equal(rdev0, rdev)) {
+				if (!sb_equal(rdev0->sb, rdev->sb)) {
+					printk("%s has same UUID as %s, but superblocks differ ...\n", partition_name(rdev->dev), partition_name(rdev0->dev));
+					continue;
+				}
+				printk("  adding %s ...\n", partition_name(rdev->dev));
+				md_list_del(&rdev->pending);
+				md_list_add(&rdev->pending, &candidates);
+			}
+		}
+		/*
+		 * now we have a set of devices, with all of them having
+		 * mostly sane superblocks. It's time to allocate the
+		 * mddev.
+		 */
+		md_kdev = MKDEV(MD_MAJOR, rdev0->sb->md_minor);
+		mddev = kdev_to_mddev(md_kdev);
+		if (mddev) {
+			printk("md%d already running, cannot run %s\n",
+				 mdidx(mddev), partition_name(rdev0->dev));
+			ITERATE_RDEV_GENERIC(candidates,pending,rdev,tmp)
+				export_rdev(rdev);
+			continue;
+		}
+		mddev = alloc_mddev(md_kdev);
+		printk("created md%d\n", mdidx(mddev));
+		ITERATE_RDEV_GENERIC(candidates,pending,rdev,tmp) {
+			bind_rdev_to_array(rdev, mddev);
+			md_list_del(&rdev->pending);
+			MD_INIT_LIST_HEAD(&rdev->pending);
+		}
+		autorun_array(mddev);
+	}
+	printk("... autorun DONE.\n");
+}
+
+/*
+ * import RAID devices based on one partition
+ * if possible, the array gets run as well.
+ */
+
+#define BAD_VERSION KERN_ERR \
+"md: %s has RAID superblock version 0.%d, autodetect needs v0.90 or higher\n"
+
+#define OUT_OF_MEM KERN_ALERT \
+"md: out of memory.\n"
+
+#define NO_DEVICE KERN_ERR \
+"md: disabled device %s\n"
+
+#define AUTOADD_FAILED KERN_ERR \
+"md: auto-adding devices to md%d FAILED (error %d).\n"
+
+#define AUTOADD_FAILED_USED KERN_ERR \
+"md: cannot auto-add device %s to md%d, already used.\n"
+
+#define AUTORUN_FAILED KERN_ERR \
+"md: auto-running md%d FAILED (error %d).\n"
+
+#define MDDEV_BUSY KERN_ERR \
+"md: cannot auto-add to md%d, already running.\n"
+
+#define AUTOADDING KERN_INFO \
+"md: auto-adding devices to md%d, based on %s's superblock.\n"
+
+#define AUTORUNNING KERN_INFO \
+"md: auto-running md%d.\n"
+
+static int autostart_array (kdev_t startdev)
+{
+	int err = -EINVAL, i;
+	mdp_super_t *sb = NULL;
+	mdk_rdev_t *start_rdev = NULL, *rdev;
+
+	if (md_import_device(startdev, 1)) {
+		printk("could not import %s!\n", partition_name(startdev));
+		goto abort;
+	}
+
+	start_rdev = find_rdev_all(startdev);
+	if (!start_rdev) {
+		MD_BUG();
+		goto abort;
+	}
+	if (start_rdev->faulty) {
+		printk("can not autostart based on faulty %s!\n",
+						partition_name(startdev));
+		goto abort;
+	}
+	md_list_add(&start_rdev->pending, &pending_raid_disks);
+
+	sb = start_rdev->sb;
+
+	err = detect_old_array(sb);
+	if (err) {
+		printk("array version is too old to be autostarted, use raidtools 0.90 mkraid --upgrade\nto upgrade the array without data loss!\n");
+		goto abort;
+	}
+
+	for (i = 0; i < MD_SB_DISKS; i++) {
+		mdp_disk_t *desc;
+		kdev_t dev;
+
+		desc = sb->disks + i;
+		dev = MKDEV(desc->major, desc->minor);
+
+		if (dev == MKDEV(0,0))
+			continue;
+		if (dev == startdev)
+			continue;
+		if (md_import_device(dev, 1)) {
+			printk("could not import %s, trying to run array nevertheless.\n", partition_name(dev));
+			continue;
+		}
+		rdev = find_rdev_all(dev);
+		if (!rdev) {
+			MD_BUG();
+			goto abort;
+		}
+		md_list_add(&rdev->pending, &pending_raid_disks);
+	}
+
+	/*
+	 * possibly return codes
+	 */
+	autorun_devices();
+	return 0;
+
+abort:
+	if (start_rdev)
+		export_rdev(start_rdev);
+	return err;
+}
+
+#undef BAD_VERSION
+#undef OUT_OF_MEM
+#undef NO_DEVICE
+#undef AUTOADD_FAILED_USED
+#undef AUTOADD_FAILED
+#undef AUTORUN_FAILED
+#undef AUTOADDING
+#undef AUTORUNNING
+
+struct {
+	int set;
+	int noautodetect;
+
+} raid_setup_args md__initdata = { 0, 0 };
+
+/*
+ * Searches all registered partitions for autorun RAID arrays
+ * at boot time.
+ */
+void md__init autodetect_raid(void)
+{
+#ifdef CONFIG_AUTODETECT_RAID
+	struct gendisk *disk;
+	mdk_rdev_t *rdev;
 	int i;
-	int hot_add=0;
-	struct real_dev *realdev;
 
-	if (md_dev[minor].nb_dev==MAX_REAL)
+	if (raid_setup_args.noautodetect) {
+		printk(KERN_INFO "skipping autodetection of RAID arrays\n");
+		return;
+	}
+	printk(KERN_INFO "autodetecting RAID arrays\n");
+
+	for (disk = gendisk_head ; disk ; disk = disk->next) {
+		for (i = 0; i < disk->max_p*disk->nr_real; i++) {
+			kdev_t dev = MKDEV(disk->major,i);
+
+			if (disk->part[i].type != LINUX_RAID_PARTITION)
+				continue;
+
+			if (md_import_device(dev,1)) {
+				printk(KERN_ALERT "could not import %s!\n",
+							partition_name(dev));
+				continue;
+			}
+			/*
+			 * Sanity checks:
+			 */
+			rdev = find_rdev_all(dev);
+			if (!rdev) {
+				MD_BUG();
+				continue;
+			}
+			if (rdev->faulty) {
+				MD_BUG();
+				continue;
+			}
+			md_list_add(&rdev->pending, &pending_raid_disks);
+		}
+	}
+
+	autorun_devices();
+#endif
+}
+
+static int get_version (void * arg)
+{
+	mdu_version_t ver;
+
+	ver.major = MD_MAJOR_VERSION;
+	ver.minor = MD_MINOR_VERSION;
+	ver.patchlevel = MD_PATCHLEVEL_VERSION;
+
+	if (md_copy_to_user(arg, &ver, sizeof(ver)))
+		return -EFAULT;
+
+	return 0;
+}
+
+#define SET_FROM_SB(x) info.x = mddev->sb->x
+static int get_array_info (mddev_t * mddev, void * arg)
+{
+	mdu_array_info_t info;
+
+	if (!mddev->sb)
+		return -EINVAL;
+
+	SET_FROM_SB(major_version);
+	SET_FROM_SB(minor_version);
+	SET_FROM_SB(patch_version);
+	SET_FROM_SB(ctime);
+	SET_FROM_SB(level);
+	SET_FROM_SB(size);
+	SET_FROM_SB(nr_disks);
+	SET_FROM_SB(raid_disks);
+	SET_FROM_SB(md_minor);
+	SET_FROM_SB(not_persistent);
+
+	SET_FROM_SB(utime);
+	SET_FROM_SB(state);
+	SET_FROM_SB(active_disks);
+	SET_FROM_SB(working_disks);
+	SET_FROM_SB(failed_disks);
+	SET_FROM_SB(spare_disks);
+
+	SET_FROM_SB(layout);
+	SET_FROM_SB(chunk_size);
+
+	if (md_copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+
+	return 0;
+}
+#undef SET_FROM_SB
+
+#define SET_FROM_SB(x) info.x = mddev->sb->disks[nr].x
+static int get_disk_info (mddev_t * mddev, void * arg)
+{
+	mdu_disk_info_t info;
+	unsigned int nr;
+
+	if (!mddev->sb)
 		return -EINVAL;
 
-	if (!fs_may_mount (dev))
+	if (md_copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	nr = info.number;
+	if (nr >= mddev->sb->nr_disks)
+		return -EINVAL;
+
+	SET_FROM_SB(major);
+	SET_FROM_SB(minor);
+	SET_FROM_SB(raid_disk);
+	SET_FROM_SB(state);
+
+	if (md_copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+
+	return 0;
+}
+#undef SET_FROM_SB
+
+#define SET_SB(x) mddev->sb->disks[nr].x = info.x
+
+static int add_new_disk (mddev_t * mddev, void * arg)
+{
+	int err, size, persistent;
+	mdu_disk_info_t info;
+	mdk_rdev_t *rdev;
+	unsigned int nr;
+	kdev_t dev;
+
+	if (!mddev->sb)
+		return -EINVAL;
+
+	if (md_copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	nr = info.number;
+	if (nr >= mddev->sb->nr_disks)
+		return -EINVAL;
+
+	dev = MKDEV(info.major,info.minor);
+
+	if (find_rdev_all(dev)) {
+		printk("device %s already used in a RAID array!\n", 
+				partition_name(dev));
 		return -EBUSY;
+	}
 
-	if (blk_size[MAJOR(dev)] == NULL || blk_size[MAJOR(dev)][MINOR(dev)] == 0) {
-		printk("md_add(): zero device size, huh, bailing out.\n");
+	SET_SB(number);
+	SET_SB(major);
+	SET_SB(minor);
+	SET_SB(raid_disk);
+	SET_SB(state);
+ 
+	if ((info.state & (1<<MD_DISK_FAULTY))==0) {
+		err = md_import_device (dev, 0);
+		if (err) {
+			printk("md: error, md_import_device() returned %d\n", err);
+			return -EINVAL;
+		}
+		rdev = find_rdev_all(dev);
+		if (!rdev) {
+			MD_BUG();
+			return -EINVAL;
+		}
+ 
+		rdev->old_dev = dev;
+		rdev->desc_nr = info.number;
+ 
+		bind_rdev_to_array(rdev, mddev);
+ 
+		persistent = !mddev->sb->not_persistent;
+		if (!persistent)
+			printk("nonpersistent superblock ...\n");
+		if (!mddev->sb->chunk_size)
+			printk("no chunksize?\n");
+ 
+		size = calc_dev_size(dev, mddev, persistent);
+		rdev->sb_offset = calc_dev_sboffset(dev, mddev, persistent);
+ 
+		if (!mddev->sb->size || (mddev->sb->size > size))
+			mddev->sb->size = size;
+	}
+ 
+	/*
+	 * sync all other superblocks with the main superblock
+	 */
+	sync_sbs(mddev);
+
+	return 0;
+}
+#undef SET_SB
+
+static int hot_remove_disk (mddev_t * mddev, kdev_t dev)
+{
+	int err;
+	mdk_rdev_t *rdev;
+	mdp_disk_t *disk;
+
+	if (!mddev->pers)
+		return -ENODEV;
+
+	printk("trying to remove %s from md%d ... \n",
+		partition_name(dev), mdidx(mddev));
+
+	if (!mddev->pers->diskop) {
+		printk("md%d: personality does not support diskops!\n",
+								 mdidx(mddev));
 		return -EINVAL;
 	}
 
-	if (md_dev[minor].pers) {
-		/*
-		 * The array is already running, hot-add the drive, or
-		 * bail out:
-		 */
-		if (!md_dev[minor].pers->hot_add_disk)
-			return -EBUSY;
-		else
-			hot_add=1;
+	rdev = find_rdev(mddev, dev);
+	if (!rdev)
+		return -ENXIO;
+
+	if (rdev->desc_nr == -1) {
+		MD_BUG();
+		return -EINVAL;
+	}
+	disk = &mddev->sb->disks[rdev->desc_nr];
+	if (disk_active(disk))
+		goto busy;
+	if (disk_removed(disk)) {
+		MD_BUG();
+		return -EINVAL;
+	}
+	
+	err = mddev->pers->diskop(mddev, &disk, DISKOP_HOT_REMOVE_DISK);
+	if (err == -EBUSY)
+		goto busy;
+	if (err) {
+		MD_BUG();
+		return -EINVAL;
+	}
+
+	remove_descriptor(disk, mddev->sb);
+	kick_rdev_from_array(rdev);
+	mddev->sb_dirty = 1;
+	md_update_sb(mddev);
+
+	return 0;
+busy:
+	printk("cannot remove active disk %s from md%d ... \n",
+		partition_name(dev), mdidx(mddev));
+	return -EBUSY;
+}
+
+static int hot_add_disk (mddev_t * mddev, kdev_t dev)
+{
+	int i, err, persistent;
+	unsigned int size;
+	mdk_rdev_t *rdev;
+	mdp_disk_t *disk;
+
+	if (!mddev->pers)
+		return -ENODEV;
+
+	printk("trying to hot-add %s to md%d ... \n",
+		partition_name(dev), mdidx(mddev));
+
+	if (!mddev->pers->diskop) {
+		printk("md%d: personality does not support diskops!\n",
+								 mdidx(mddev));
+		return -EINVAL;
+	}
+
+	persistent = !mddev->sb->not_persistent;
+	size = calc_dev_size(dev, mddev, persistent);
+
+	if (size < mddev->sb->size) {
+		printk("md%d: disk size %d blocks < array size %d\n",
+				mdidx(mddev), size, mddev->sb->size);
+		return -ENOSPC;
+	}
+
+	rdev = find_rdev(mddev, dev);
+	if (rdev)
+		return -EBUSY;
+
+	err = md_import_device (dev, 0);
+	if (err) {
+		printk("md: error, md_import_device() returned %d\n", err);
+		return -EINVAL;
+	}
+	rdev = find_rdev_all(dev);
+	if (!rdev) {
+		MD_BUG();
+		return -EINVAL;
+	}
+	if (rdev->faulty) {
+		printk("md: can not hot-add faulty %s disk to md%d!\n",
+				partition_name(dev), mdidx(mddev));
+		err = -EINVAL;
+		goto abort_export;
 	}
+	bind_rdev_to_array(rdev, mddev);
 
 	/*
-	 * Careful. We cannot increase nb_dev for a running array.
+	 * The rest should better be atomic, we can have disk failures
+	 * noticed in interrupt contexts ...
 	 */
-	i=md_dev[minor].nb_dev;
-	realdev = &md_dev[minor].devices[i];
-	realdev->dev=dev;
-  
-	/* Lock the device by inserting a dummy inode. This doesn't
-	   smell very good, but I need to be consistent with the
-	   mount stuff, specially with fs_may_mount. If someone have
-	   a better idea, please help ! */
-  
-	realdev->inode=get_empty_inode ();
-	if (!realdev->inode)
-		return -ENOMEM;
-	realdev->inode->i_dev=dev; 	/* don't care about other fields */
-	insert_inode_hash (realdev->inode);
-  
-	/* Sizes are now rounded at run time */
-  
-/*  md_dev[minor].devices[i].size=gen_real->sizes[MINOR(dev)]; HACKHACK*/
+	rdev->old_dev = dev;
+	rdev->size = size;
+	rdev->sb_offset = calc_dev_sboffset(dev, mddev, persistent);
 
-	realdev->size=blk_size[MAJOR(dev)][MINOR(dev)];
+	disk = mddev->sb->disks + mddev->sb->raid_disks;
+	for (i = mddev->sb->raid_disks; i < MD_SB_DISKS; i++) {
+		disk = mddev->sb->disks + i;
 
-	if (hot_add) {
-		/*
-		 * Check the superblock for consistency.
-		 * The personality itself has to check whether it's getting
-		 * added with the proper flags.  The personality has to be
-                 * checked too. ;)
-		 */
-		if (analyze_one_sb (realdev))
-			return -EINVAL;
+		if (!disk->major && !disk->minor)
+			break;
+		if (disk_removed(disk))
+			break;
+	}
+	if (i == MD_SB_DISKS) {
+		printk("md%d: can not hot-add to full array!\n", mdidx(mddev));
+		err = -EBUSY;
+		goto abort_unbind_export;
+	}
+
+	if (disk_removed(disk)) {
 		/*
-		 * hot_add has to bump up nb_dev itself
+		 * reuse slot
 		 */
-		if (md_dev[minor].pers->hot_add_disk (&md_dev[minor], dev)) {
-			/*
-			 * FIXME: here we should free up the inode and stuff
-			 */
-			printk ("FIXME\n");
-			return -EINVAL;
+		if (disk->number != i) {
+			MD_BUG();
+			err = -EINVAL;
+			goto abort_unbind_export;
 		}
-	} else
-		md_dev[minor].nb_dev++;
+	} else {
+		disk->number = i;
+	}
 
-	printk ("REGISTER_DEV %s to md%x done\n", partition_name(dev), minor);
-	return (0);
+	disk->raid_disk = disk->number;
+	disk->major = MAJOR(dev);
+	disk->minor = MINOR(dev);
+
+	if (mddev->pers->diskop(mddev, &disk, DISKOP_HOT_ADD_DISK)) {
+		MD_BUG();
+		err = -EINVAL;
+		goto abort_unbind_export;
+	}
+
+	mark_disk_spare(disk);
+	mddev->sb->nr_disks++;
+	mddev->sb->spare_disks++;
+	mddev->sb->working_disks++;
+
+	mddev->sb_dirty = 1;
+
+	md_update_sb(mddev);
+
+	/*
+	 * Kick recovery, maybe this spare has to be added to the
+	 * array immediately.
+	 */
+	md_recover_arrays();
+
+	return 0;
+
+abort_unbind_export:
+	unbind_rdev_from_array(rdev);
+
+abort_export:
+	export_rdev(rdev);
+	return err;
 }
 
-static int md_ioctl (struct inode *inode, struct file *file,
-                     unsigned int cmd, unsigned long arg)
+#define SET_SB(x) mddev->sb->x = info.x
+static int set_array_info (mddev_t * mddev, void * arg)
 {
-  int minor, err;
-  struct hd_geometry *loc = (struct hd_geometry *) arg;
+	mdu_array_info_t info;
 
-  if (!capable(CAP_SYS_ADMIN))
-    return -EACCES;
+	if (mddev->sb) {
+		printk("array md%d already has a superblock!\n", 
+				mdidx(mddev));
+		return -EBUSY;
+	}
 
-  if (((minor=MINOR(inode->i_rdev)) & 0x80) &&
-      (minor & 0x7f) < MAX_PERSONALITY &&
-      pers[minor & 0x7f] &&
-      pers[minor & 0x7f]->ioctl)
-    return (pers[minor & 0x7f]->ioctl (inode, file, cmd, arg));
-  
-  if (minor >= MAX_MD_DEV)
-    return -EINVAL;
-
-  switch (cmd)
-  {
-    case REGISTER_DEV:
-      return do_md_add (minor, to_kdev_t ((dev_t) arg));
-
-    case START_MD:
-      return do_md_run (minor, (int) arg);
-
-    case STOP_MD:
-      return do_md_stop (minor, inode);
-      
-    case BLKGETSIZE:   /* Return device size */
-    if  (!arg)  return -EINVAL;
-    err = put_user (md_hd_struct[MINOR(inode->i_rdev)].nr_sects, (long *) arg);
-    if (err)
-      return err;
-    break;
-
-    
-    /* 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)  return -EINVAL;
-    err = put_user (2, (char *) &loc->heads);
-    if (err)
-      return err;
-    err = put_user (4, (char *) &loc->sectors);
-    if (err)
-      return err;
-    err = put_user (md_hd_struct[minor].nr_sects/8, (short *) &loc->cylinders);
-    if (err)
-      return err;
-    err = put_user (md_hd_struct[MINOR(inode->i_rdev)].start_sect,
-		(long *) &loc->start);
-    if (err)
-      return err;
-    break;
-    
-    case BLKROSET:
-    case BLKROGET:
-    case BLKRAGET:
-    case BLKRASET:
-    case BLKFLSBUF:
-	  return blk_ioctl(inode->i_rdev, cmd, arg);
-    
-    default:
-    return -EINVAL;
-  }
-
-  return (0);
+	if (md_copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	if (alloc_array_sb(mddev))
+		return -ENOMEM;
+
+	mddev->sb->major_version = MD_MAJOR_VERSION;
+	mddev->sb->minor_version = MD_MINOR_VERSION;
+	mddev->sb->patch_version = MD_PATCHLEVEL_VERSION;
+	mddev->sb->ctime = CURRENT_TIME;
+
+	SET_SB(level);
+	SET_SB(size);
+	SET_SB(nr_disks);
+	SET_SB(raid_disks);
+	SET_SB(md_minor);
+	SET_SB(not_persistent);
+
+	SET_SB(state);
+	SET_SB(active_disks);
+	SET_SB(working_disks);
+	SET_SB(failed_disks);
+	SET_SB(spare_disks);
+
+	SET_SB(layout);
+	SET_SB(chunk_size);
+
+	mddev->sb->md_magic = MD_SB_MAGIC;
+
+	/*
+	 * Generate a 128 bit UUID
+	 */
+	get_random_bytes(&mddev->sb->set_uuid0, 4);
+	get_random_bytes(&mddev->sb->set_uuid1, 4);
+	get_random_bytes(&mddev->sb->set_uuid2, 4);
+	get_random_bytes(&mddev->sb->set_uuid3, 4);
+
+	return 0;
 }
+#undef SET_SB
 
-static int md_open (struct inode *inode, struct file *file)
+static int set_disk_info (mddev_t * mddev, void * arg)
 {
-  int minor=MINOR(inode->i_rdev);
+	printk("not yet");
+	return -EINVAL;
+}
 
-  md_dev[minor].busy++;
-  return (0);			/* Always succeed */
+static int clear_array (mddev_t * mddev)
+{
+	printk("not yet");
+	return -EINVAL;
 }
 
+static int write_raid_info (mddev_t * mddev)
+{
+	printk("not yet");
+	return -EINVAL;
+}
 
-static int md_release (struct inode *inode, struct file *file)
+static int protect_array (mddev_t * mddev)
 {
-  int minor=MINOR(inode->i_rdev);
-  md_dev[minor].busy--;
-  return 0;
+	printk("not yet");
+	return -EINVAL;
 }
 
-static struct block_device_operations md_fops=
+static int unprotect_array (mddev_t * mddev)
 {
-	open:		md_open,
-	release:	md_release,
-	ioctl:		md_ioctl,
-};
+	printk("not yet");
+	return -EINVAL;
+}
 
-int md_map (int minor, kdev_t *rdev, unsigned long *rsector, unsigned long size)
+static int set_disk_faulty (mddev_t *mddev, kdev_t dev)
 {
-  if ((unsigned int) minor >= MAX_MD_DEV)
-  {
-    printk ("Bad md device %d\n", minor);
-    return (-1);
-  }
-  
-  if (!md_dev[minor].pers)
-  {
-    printk ("Oops ! md%d not running, giving up !\n", minor);
-    return (-1);
-  }
+	int ret;
 
-  return (md_dev[minor].pers->map(md_dev+minor, rdev, rsector, size));
+	fsync_dev(mddev_to_kdev(mddev));
+	ret = md_error(mddev_to_kdev(mddev), dev);
+	return ret;
 }
-  
-int md_make_request (int minor, int rw, struct buffer_head * bh)
+
+static int md_ioctl (struct inode *inode, struct file *file,
+			unsigned int cmd, unsigned long arg)
 {
-	if (md_dev [minor].pers->make_request) {
-		if (buffer_locked(bh))
-			return 0;
-		set_bit(BH_Lock, &bh->b_state);
-		if (rw == WRITE) {
-			if (!buffer_dirty(bh)) {
-				bh->b_end_io(bh, test_bit(BH_Uptodate, &bh->b_state));
-				return 0;
+	unsigned int minor;
+	int err = 0;
+	struct hd_geometry *loc = (struct hd_geometry *) arg;
+	mddev_t *mddev = NULL;
+	kdev_t dev;
+
+	if (!md_capable_admin())
+		return -EACCES;
+
+	dev = inode->i_rdev;
+	minor = MINOR(dev);
+	if (minor >= MAX_MD_DEVS)
+		return -EINVAL;
+
+	/*
+	 * Commands dealing with the RAID driver but not any
+	 * particular array:
+	 */
+	switch (cmd)
+	{
+		case RAID_VERSION:
+			err = get_version((void *)arg);
+			goto done;
+
+		case PRINT_RAID_DEBUG:
+			err = 0;
+			md_print_devices();
+			goto done_unlock;
+
+		case BLKGETSIZE:   /* Return device size */
+			if (!arg) {
+				err = -EINVAL;
+				goto abort;
 			}
-		}
-		if (rw == READ || rw == READA) {
-			if (buffer_uptodate(bh)) {
-				bh->b_end_io(bh, test_bit(BH_Uptodate, &bh->b_state));
-				return 0;
+			err = md_put_user(md_hd_struct[minor].nr_sects,
+						(long *) arg);
+			goto done;
+
+		case BLKFLSBUF:
+			fsync_dev(dev);
+			invalidate_buffers(dev);
+			goto done;
+
+		case BLKRASET:
+			if (arg > 0xff) {
+				err = -EINVAL;
+				goto abort;
+			}
+			read_ahead[MAJOR(dev)] = arg;
+			goto done;
+
+		case BLKRAGET:
+			if (!arg) {
+				err = -EINVAL;
+				goto abort;
+			}
+			err = md_put_user (read_ahead[
+				MAJOR(dev)], (long *) arg);
+			goto done;
+		default:
+	}
+
+	/*
+	 * Commands creating/starting a new array:
+	 */
+
+	mddev = kdev_to_mddev(dev);
+
+	switch (cmd)
+	{
+		case SET_ARRAY_INFO:
+		case START_ARRAY:
+			if (mddev) {
+				printk("array md%d already exists!\n",
+								mdidx(mddev));
+				err = -EEXIST;
+				goto abort;
+			}
+		default:
+	}
+
+	switch (cmd)
+	{
+		case SET_ARRAY_INFO:
+			mddev = alloc_mddev(dev);
+			if (!mddev) {
+				err = -ENOMEM;
+				goto abort;
+			}
+			/*
+			 * alloc_mddev() should possibly self-lock.
+			 */
+			err = lock_mddev(mddev);
+			if (err) {
+				printk("ioctl, reason %d, cmd %d\n", err, cmd);
+				goto abort;
+			}
+			err = set_array_info(mddev, (void *)arg);
+			if (err) {
+				printk("couldnt set array info. %d\n", err);
+				goto abort;
+			}
+			goto done_unlock;
+
+		case START_ARRAY:
+			/*
+			 * possibly make it lock the array ...
+			 */
+			err = autostart_array((kdev_t)arg);
+			if (err) {
+				printk("autostart %s failed!\n",
+					partition_name((kdev_t)arg));
+				goto abort;
+			}
+			goto done;
+
+		default:
+	}
+
+	/*
+	 * Commands querying/configuring an existing array:
+	 */
+
+	if (!mddev) {
+		err = -ENODEV;
+		goto abort;
+	}
+	err = lock_mddev(mddev);
+	if (err) {
+		printk("ioctl lock interrupted, reason %d, cmd %d\n",err, cmd);
+		goto abort;
+	}
+
+	/*
+	 * Commands even a read-only array can execute:
+	 */
+	switch (cmd)
+	{
+		case GET_ARRAY_INFO:
+			err = get_array_info(mddev, (void *)arg);
+			goto done_unlock;
+
+		case GET_DISK_INFO:
+			err = get_disk_info(mddev, (void *)arg);
+			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 = md_put_user (2, (char *) &loc->heads);
+			if (err)
+				goto abort_unlock;
+			err = md_put_user (4, (char *) &loc->sectors);
+			if (err)
+				goto abort_unlock;
+			err = md_put_user (md_hd_struct[mdidx(mddev)].nr_sects/8,
+						(short *) &loc->cylinders);
+			if (err)
+				goto abort_unlock;
+			err = md_put_user (md_hd_struct[minor].start_sect,
+						(long *) &loc->start);
+			goto done_unlock;
+	}
+
+	/*
+	 * The remaining ioctls are changing the state of the
+	 * superblock, so we do not allow read-only arrays
+	 * here:
+	 */
+	if (mddev->ro) {
+		err = -EROFS;
+		goto abort_unlock;
+	}
+
+	switch (cmd)
+	{
+		case CLEAR_ARRAY:
+			err = clear_array(mddev);
+			goto done_unlock;
+
+		case ADD_NEW_DISK:
+			err = add_new_disk(mddev, (void *)arg);
+			goto done_unlock;
+
+		case HOT_REMOVE_DISK:
+			err = hot_remove_disk(mddev, (kdev_t)arg);
+			goto done_unlock;
+
+		case HOT_ADD_DISK:
+			err = hot_add_disk(mddev, (kdev_t)arg);
+			goto done_unlock;
+
+		case SET_DISK_INFO:
+			err = set_disk_info(mddev, (void *)arg);
+			goto done_unlock;
+
+		case WRITE_RAID_INFO:
+			err = write_raid_info(mddev);
+			goto done_unlock;
+
+		case UNPROTECT_ARRAY:
+			err = unprotect_array(mddev);
+			goto done_unlock;
+
+		case PROTECT_ARRAY:
+			err = protect_array(mddev);
+			goto done_unlock;
+
+		case SET_DISK_FAULTY:
+			err = set_disk_faulty(mddev, (kdev_t)arg);
+			goto done_unlock;
+
+		case RUN_ARRAY:
+		{
+			mdu_param_t param;
+
+			err = md_copy_from_user(&param, (mdu_param_t *)arg,
+							 sizeof(param));
+			if (err)
+				goto abort_unlock;
+
+			err = do_md_run (mddev);
+			/*
+			 * we have to clean up the mess if
+			 * the array cannot be run for some
+			 * reason ...
+			 */
+			if (err) {
+				mddev->sb_dirty = 0;
+				do_md_stop (mddev, 0);
+			}
+			goto done_unlock;
 		}
-		return (md_dev[minor].pers->make_request(md_dev+minor, rw, bh));
-	} else {
-		make_request (MAJOR(bh->b_rdev), rw, bh);
-		return 0;
+
+		default:
+			printk(KERN_WARNING "%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:
+	if (mddev)
+		unlock_mddev(mddev);
+	else
+		printk("huh11?\n");
+
+	return err;
+done:
+	if (err)
+		printk("huh12?\n");
+abort:
+	return err;
 }
 
-static void do_md_request (request_queue_t * q)
+static int md_open (struct inode *inode, struct file *file)
 {
-  printk ("Got md request, not good...");
-  return;
+	/*
+	 * Always succeed
+	 */
+	return (0);
 }
 
-void md_wakeup_thread(struct md_thread *thread)
+static struct block_device_operations md_fops=
 {
+	open:		md_open,
+	ioctl:		md_ioctl,
+};
+ 
+
+int md_thread(void * arg)
+{
+	mdk_thread_t *thread = arg;
+
+	md_lock_kernel();
+	exit_mm(current);
+	exit_files(current);
+	exit_fs(current);
+
+	/*
+	 * Detach thread
+	 */
+	sys_setsid();
+	sprintf(current->comm, thread->name);
+	md_init_signals();
+	md_flush_signals();
+	thread->tsk = current;
+
+	/*
+	 * md_thread is a 'system-thread', it's priority should be very
+	 * high. We avoid resource deadlocks individually in each
+	 * raid personality. (RAID5 does preallocation) We also use RR and
+	 * the very same RT priority as kswapd, thus we will never get
+	 * into a priority inversion deadlock.
+	 *
+	 * we definitely have to have equal or higher priority than
+	 * bdflush, otherwise bdflush will deadlock if there are too
+	 * many dirty RAID5 blocks.
+	 */
+	current->policy = SCHED_OTHER;
+	current->priority = 40;
+//	md_unlock_kernel();
+
+	up(thread->sem);
+
+	for (;;) {
+		DECLARE_WAITQUEUE(wait, current);
+
+		add_wait_queue(&thread->wqueue, &wait);
+		if (!test_bit(THREAD_WAKEUP, &thread->flags)) {
+			set_task_state(current, TASK_INTERRUPTIBLE);
+			dprintk("thread %p went to sleep.\n", thread);
+			schedule();
+			dprintk("thread %p woke up.\n", thread);
+			current->state = TASK_RUNNING;
+		}
+		remove_wait_queue(&thread->wqueue, &wait);
+		clear_bit(THREAD_WAKEUP, &thread->flags);
+
+		if (thread->run) {
+			thread->run(thread->data);
+			run_task_queue(&tq_disk);
+		} else
+			break;
+		if (md_signal_pending(current)) {
+			printk("%8s(%d) flushing signals.\n", current->comm,
+				current->pid);
+			md_flush_signals();
+		}
+	}
+	up(thread->sem);
+	return 0;
+}
+
+void md_wakeup_thread(mdk_thread_t *thread)
+{
+	dprintk("waking up MD thread %p.\n", thread);
 	set_bit(THREAD_WAKEUP, &thread->flags);
 	wake_up(&thread->wqueue);
 }
 
-struct md_thread *md_register_thread (void (*run) (void *), void *data)
+mdk_thread_t *md_register_thread (void (*run) (void *),
+						void *data, const char *name)
 {
-	struct md_thread *thread = (struct md_thread *)
-		kmalloc(sizeof(struct md_thread), GFP_KERNEL);
+	mdk_thread_t *thread;
 	int ret;
 	DECLARE_MUTEX_LOCKED(sem);
 	
-	if (!thread) return NULL;
+	thread = (mdk_thread_t *) kmalloc
+				(sizeof(mdk_thread_t), GFP_KERNEL);
+	if (!thread)
+		return NULL;
 	
-	memset(thread, 0, sizeof(struct md_thread));
-	init_waitqueue_head(&thread->wqueue);
+	memset(thread, 0, sizeof(mdk_thread_t));
+	md_init_waitqueue_head(&thread->wqueue);
 	
 	thread->sem = &sem;
 	thread->run = run;
 	thread->data = data;
+	thread->name = name;
 	ret = kernel_thread(md_thread, thread, 0);
 	if (ret < 0) {
 		kfree(thread);
@@ -760,387 +2882,317 @@ struct md_thread *md_register_thread (void (*run) (void *), void *data)
 	return thread;
 }
 
-void md_unregister_thread (struct md_thread *thread)
+void md_interrupt_thread (mdk_thread_t *thread)
+{
+	if (!thread->tsk) {
+		MD_BUG();
+		return;
+	}
+	printk("interrupting MD-thread pid %d\n", thread->tsk->pid);
+	send_sig(SIGKILL, thread->tsk, 1);
+}
+
+void md_unregister_thread (mdk_thread_t *thread)
 {
 	DECLARE_MUTEX_LOCKED(sem);
 	
 	thread->sem = &sem;
 	thread->run = NULL;
-	if (thread->tsk)
-		printk("Killing md_thread %d %p %s\n",
-		       thread->tsk->pid, thread->tsk, thread->tsk->comm);
-	else
-		printk("Aiee. md_thread has 0 tsk\n");
-	send_sig(SIGKILL, thread->tsk, 1);
-	printk("downing on %p\n", &sem);
+	thread->name = NULL;
+	if (!thread->tsk) {
+		MD_BUG();
+		return;
+	}
+	md_interrupt_thread(thread);
 	down(&sem);
 }
 
-#define SHUTDOWN_SIGS   (sigmask(SIGKILL)|sigmask(SIGINT)|sigmask(SIGTERM))
+void md_recover_arrays (void)
+{
+	if (!md_recovery_thread) {
+		MD_BUG();
+		return;
+	}
+	md_wakeup_thread(md_recovery_thread);
+}
 
-int md_thread(void * arg)
+
+int md_error (kdev_t dev, kdev_t rdev)
 {
-	struct md_thread *thread = arg;
+	mddev_t *mddev = kdev_to_mddev(dev);
+	mdk_rdev_t * rrdev;
+	int rc;
 
-	lock_kernel();
-	exit_mm(current);
-	exit_files(current);
-	exit_fs(current);
-	
-	current->session = 1;
-	current->pgrp = 1;
-	sprintf(current->comm, "md_thread");
-	siginitsetinv(&current->blocked, SHUTDOWN_SIGS);
-	thread->tsk = current;
-	up(thread->sem);
+	printk("md_error dev:(%d:%d), rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",MAJOR(dev),MINOR(dev),MAJOR(rdev),MINOR(rdev), __builtin_return_address(0),__builtin_return_address(1),__builtin_return_address(2),__builtin_return_address(3));
 
-	for (;;) {
-		cli();
-		if (!test_bit(THREAD_WAKEUP, &thread->flags)) {
-			do {
-			        spin_lock(&current->sigmask_lock);
-				flush_signals(current);
-	  			spin_unlock(&current->sigmask_lock);
-				interruptible_sleep_on(&thread->wqueue);
-				cli();
-				if (test_bit(THREAD_WAKEUP, &thread->flags))
-					break;
-				if (!thread->run) {
-					sti();
-					up(thread->sem);
-					return 0;
-				}
-			} while (signal_pending(current));
-		}
-		sti();
-		clear_bit(THREAD_WAKEUP, &thread->flags);
-		if (thread->run) {
-			thread->run(thread->data);
-			run_task_queue(&tq_disk);
+	if (!mddev) {
+		MD_BUG();
+		return 0;
+	}
+	rrdev = find_rdev(mddev, rdev);
+	mark_rdev_faulty(rrdev);
+	/*
+	 * if recovery was running, stop it now.
+	 */
+	if (mddev->pers->stop_resync)
+		mddev->pers->stop_resync(mddev);
+	if (mddev->recovery_running)
+		md_interrupt_thread(md_recovery_thread);
+	if (mddev->pers->error_handler) {
+		rc = mddev->pers->error_handler(mddev, rdev);
+		md_recover_arrays();
+		return rc;
+	}
+	return 0;
+}
+
+static int status_unused (char * page)
+{
+	int sz = 0, i = 0;
+	mdk_rdev_t *rdev;
+	struct md_list_head *tmp;
+
+	sz += sprintf(page + sz, "unused devices: ");
+
+	ITERATE_RDEV_ALL(rdev,tmp) {
+		if (!rdev->same_set.next && !rdev->same_set.prev) {
+			/*
+			 * The device is not yet used by any array.
+			 */
+			i++;
+			sz += sprintf(page + sz, "%s ",
+				partition_name(rdev->dev));
 		}
 	}
+	if (!i)
+		sz += sprintf(page + sz, "<none>");
+
+	sz += sprintf(page + sz, "\n");
+	return sz;
 }
 
-EXPORT_SYMBOL(md_size);
-EXPORT_SYMBOL(md_maxreadahead);
-EXPORT_SYMBOL(register_md_personality);
-EXPORT_SYMBOL(unregister_md_personality);
-EXPORT_SYMBOL(md_dev);
-EXPORT_SYMBOL(md_error);
-EXPORT_SYMBOL(md_register_thread);
-EXPORT_SYMBOL(md_unregister_thread);
-EXPORT_SYMBOL(md_update_sb);
-EXPORT_SYMBOL(md_map);
-EXPORT_SYMBOL(md_wakeup_thread);
-EXPORT_SYMBOL(md_do_sync);
 
-#ifdef CONFIG_PROC_FS
+static int status_resync (char * page, mddev_t * mddev)
+{
+	int sz = 0;
+	unsigned int blocksize, max_blocks, resync, res, dt, tt, et;
+
+	resync = mddev->curr_resync;
+	blocksize = blksize_size[MD_MAJOR][mdidx(mddev)];
+	max_blocks = blk_size[MD_MAJOR][mdidx(mddev)] / (blocksize >> 10);
+
+	/*
+	 * Should not happen.
+	 */		
+	if (!max_blocks) {
+		MD_BUG();
+		return 0;
+	}
+	res = (resync/1024)*1000/(max_blocks/1024 + 1);
+	{
+		int i, x = res/50, y = 20-x;
+		sz += sprintf(page + sz, "[");
+		for (i = 0; i < x; i++)
+			sz += sprintf(page + sz, "=");
+		sz += sprintf(page + sz, ">");
+		for (i = 0; i < y; i++)
+			sz += sprintf(page + sz, ".");
+		sz += sprintf(page + sz, "] ");
+	}
+	if (!mddev->recovery_running)
+		/*
+		 * true resync
+		 */
+		sz += sprintf(page + sz, " resync =%3u.%u%% (%u/%u)",
+				res/10, res % 10, resync, max_blocks);
+	else
+		/*
+		 * recovery ...
+		 */
+		sz += sprintf(page + sz, " recovery =%3u.%u%% (%u/%u)",
+				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 until now
+	 * tt: total time
+	 * et: estimated finish time
+	 */
+	dt = ((jiffies - mddev->resync_start) / HZ);
+	tt = (dt * (max_blocks / (resync/100+1)))/100;
+	if (tt > dt)
+		et = tt - dt;
+	else
+		/*
+		 * ignore rounding effects near finish time
+		 */
+		et = 0;
+	
+	sz += sprintf(page + sz, " finish=%u.%umin", et / 60, (et % 60)/6);
+
+	return sz;
+}
+
 static int md_status_read_proc(char *page, char **start, off_t off,
 			int count, int *eof, void *data)
 {
-	int sz = 0, i, j, size;
-	int begin = 0;
+	int sz = 0, j, size;
+	struct md_list_head *tmp, *tmp2;
+	mdk_rdev_t *rdev;
+	mddev_t *mddev;
 
-	sz=sprintf( page, "Personalities : ");
-	for (i=0; i<MAX_PERSONALITY; i++)
-		if (pers[i])
-			sz+=sprintf (page+sz, "[%d %s] ", i, pers[i]->name);
-	page[sz-1]='\n';
+	sz += sprintf(page + sz, "Personalities : ");
+	for (j = 0; j < MAX_PERSONALITY; j++)
+	if (pers[j])
+		sz += sprintf(page+sz, "[%s] ", pers[j]->name);
 
-	sz+=sprintf (page+sz, "read_ahead ");
-	if (read_ahead[MD_MAJOR]==INT_MAX)
-		sz+=sprintf (page+sz, "not set\n");
-	else
-		sz+=sprintf (page+sz, "%d sectors\n", read_ahead[MD_MAJOR]);
+	sz += sprintf(page+sz, "\n");
 
-	for (i=0; i<MAX_MD_DEV; i++) {
-		if (sz < off) {
-			begin += sz;
-			off -= sz;
-			sz = 0;
-		}
-		if (sz >= off+count) {
-			*eof = 1;
-			break;
-		}
-		sz+=sprintf (page+sz, "md%d : %sactive",
-				i, md_dev[i].pers ? "" : "in");
 
-		if (md_dev[i].pers)
-			sz+=sprintf (page+sz, " %s", md_dev[i].pers->name);
+	sz += sprintf(page+sz, "read_ahead ");
+	if (read_ahead[MD_MAJOR] == INT_MAX)
+		sz += sprintf(page+sz, "not set\n");
+	else
+		sz += sprintf(page+sz, "%d sectors\n", read_ahead[MD_MAJOR]);
+  
+	ITERATE_MDDEV(mddev,tmp) {
+		sz += sprintf(page + sz, "md%d : %sactive", mdidx(mddev),
+						mddev->pers ? "" : "in");
+		if (mddev->pers) {
+			if (mddev->ro)	
+				sz += sprintf(page + sz, " (read-only)");
+			sz += sprintf(page + sz, " %s", mddev->pers->name);
+		}
 
-		for (j=0, size=0; j<md_dev[i].nb_dev; j++) {
-			sz+=sprintf (page+sz, " %s",
-				partition_name(md_dev[i].devices[j].dev));
-			size+=md_dev[i].devices[j].size;
+		size = 0;
+		ITERATE_RDEV(mddev,rdev,tmp2) {
+			sz += sprintf(page + sz, " %s[%d]",
+				partition_name(rdev->dev), rdev->desc_nr);
+			if (rdev->faulty) {
+				sz += sprintf(page + sz, "(F)");
+				continue;
+			}
+			size += rdev->size;
 		}
 
-		if (md_dev[i].nb_dev) {
-			if (md_dev[i].pers)
-				sz+=sprintf (page+sz, " %d blocks", md_size[i]);
+		if (mddev->nb_dev) {
+			if (mddev->pers)
+				sz += sprintf(page + sz, "\n      %d blocks",
+						 md_size[mdidx(mddev)]);
 			else
-				sz+=sprintf (page+sz, " %d blocks", size);
+				sz += sprintf(page + sz, "\n      %d blocks", size);
 		}
 
-		if (!md_dev[i].pers) {
-			sz+=sprintf (page+sz, "\n");
+		if (!mddev->pers) {
+			sz += sprintf(page+sz, "\n");
 			continue;
 		}
 
-		if (md_dev[i].pers->max_invalid_dev)
-			sz+=sprintf (page+sz, " maxfault=%ld",
-					MAX_FAULT(md_dev+i));
+		sz += mddev->pers->status (page+sz, mddev);
 
-		sz+=md_dev[i].pers->status (page+sz, i, md_dev+i);
-		sz+=sprintf (page+sz, "\n");
+		sz += sprintf(page+sz, "\n      ");
+		if (mddev->curr_resync) {
+			sz += status_resync (page+sz, mddev);
+		} else {
+			if (md_atomic_read(&mddev->resync_sem.count) != 1)
+				sz += sprintf(page + sz, "       resync=DELAYED");
+		}
+		sz += sprintf(page + sz, "\n");
 	}
+	sz += status_unused (page + sz);
 
-	sz -= off;
-	*start = page + off;
-	if (sz>count)
-		sz = count;
-	if (sz<0)
-		sz = 0;
 	return sz;
 }
-#endif
-
-static void md_geninit (void)
-{
-  int i;
-  
-  blksize_size[MD_MAJOR] = md_blocksizes;
-  max_readahead[MD_MAJOR] = md_maxreadahead;
-  for(i=0;i<MAX_MD_DEV;i++)
-  {
-    md_blocksizes[i] = 1024;
-    md_maxreadahead[i] = MD_DEFAULT_DISK_READAHEAD;
-    md_dev[i].pers=NULL;
-    register_disk(&md_gendisk, MKDEV(MAJOR_NR,i), 1, &md_fops, 0);
-  }
-
-#ifdef CONFIG_PROC_FS
-	create_proc_read_entry("mdstat", 0, NULL, md_status_read_proc, NULL);
-#endif
-}
-
-int md_error (kdev_t mddev, kdev_t rdev)
-{
-    unsigned int minor = MINOR (mddev);
-    int rc;
-
-    if (MAJOR(mddev) != MD_MAJOR || minor > MAX_MD_DEV)
-	panic ("md_error gets unknown device\n");
-    if (!md_dev [minor].pers)
-	panic ("md_error gets an error for an unknown device\n");
-    if (md_dev [minor].pers->error_handler) {
-	rc = md_dev [minor].pers->error_handler (md_dev+minor, rdev);
-#if SUPPORT_RECONSTRUCTION
-	md_wakeup_thread(md_sync_thread);
-#endif /* SUPPORT_RECONSTRUCTION */
-	return rc;
-    }
-    return 0;
-}
 
-int register_md_personality (int p_num, struct md_personality *p)
+int register_md_personality (int pnum, mdk_personality_t *p)
 {
-  int i=(p_num >> PERSONALITY_SHIFT);
-
-  if (i >= MAX_PERSONALITY)
-    return -EINVAL;
+	if (pnum >= MAX_PERSONALITY)
+		return -EINVAL;
 
-  if (pers[i])
-    return -EBUSY;
+	if (pers[pnum])
+		return -EBUSY;
   
-  pers[i]=p;
-  printk ("%s personality registered\n", p->name);
-  return 0;
+	pers[pnum] = p;
+	printk(KERN_INFO "%s personality registered\n", p->name);
+	return 0;
 }
 
-int unregister_md_personality (int p_num)
+int unregister_md_personality (int pnum)
 {
-  int i=(p_num >> PERSONALITY_SHIFT);
-
-  if (i >= MAX_PERSONALITY)
-    return -EINVAL;
+	if (pnum >= MAX_PERSONALITY)
+		return -EINVAL;
 
-  printk ("%s personality unregistered\n", pers[i]->name);
-  pers[i]=NULL;
-  return 0;
+	printk(KERN_INFO "%s personality unregistered\n", pers[pnum]->name);
+	pers[pnum] = NULL;
+	return 0;
 } 
 
-static md_descriptor_t *get_spare(struct md_dev *mddev)
+int md_notify_reboot(struct notifier_block *this,
+					unsigned long code, void *x)
 {
-	int i;
-	md_superblock_t *sb = mddev->sb;
-	md_descriptor_t *descriptor;
-	struct real_dev *realdev;
-	
-  	for (i = 0; i < mddev->nb_dev; i++) {
-  		realdev = &mddev->devices[i];
-		if (!realdev->sb)
-			continue;
-		descriptor = &sb->disks[realdev->sb->descriptor.number];
-		if (descriptor->state & (1 << MD_FAULTY_DEVICE))
-			continue;
-		if (descriptor->state & (1 << MD_ACTIVE_DEVICE))
-			continue;
-		return descriptor;
-	}
-	return NULL;
-}
+	struct md_list_head *tmp;
+	mddev_t *mddev;
 
-/*
- * parallel resyncing thread. 
- *
- * FIXME: - make it abort with a dirty array on mdstop, now it just blocks
- *        - fix read error handing
- */
-
-int md_do_sync(struct md_dev *mddev)
-{
-        struct buffer_head *bh;
-	int max_blocks, blocksize, curr_bsize, percent=1, j;
-	kdev_t read_disk = MKDEV(MD_MAJOR, mddev - md_dev);
-	int major = MAJOR(read_disk), minor = MINOR(read_disk);
-	unsigned long starttime;
-
-	blocksize = blksize_size[major][minor];
-	max_blocks = blk_size[major][minor] / (blocksize >> 10);
+	if ((code == MD_SYS_DOWN) || (code == MD_SYS_HALT)
+				  || (code == MD_SYS_POWER_OFF)) {
 
-	printk("... resync log\n");
-	printk(" ....   mddev->nb_dev: %d\n", mddev->nb_dev);
-	printk(" ....   raid array: %s\n", kdevname(read_disk));
-	printk(" ....   max_blocks: %d blocksize: %d\n", max_blocks, blocksize);
-	printk("md: syncing RAID array %s\n", kdevname(read_disk));
-
-	mddev->busy++;
-
-	starttime=jiffies;
-	for (j = 0; j < max_blocks; j++) {
+		printk(KERN_INFO "stopping all md devices.\n");
 
+		ITERATE_MDDEV(mddev,tmp)
+			do_md_stop (mddev, 1);
 		/*
-		 * B careful. When some1 mounts a non-'blocksize' filesystem
-		 * then we get the blocksize changed right under us. Go deal
-		 * with it transparently, recalculate 'blocksize', 'j' and
-		 * 'max_blocks':
+		 * 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 ...
 		 */
-		curr_bsize = blksize_size[major][minor];
-		if (curr_bsize != blocksize) {
-		diff_blocksize:
-			if (curr_bsize > blocksize)
-				/*
-				 * this is safe, rounds downwards.
-				 */
-				j /= curr_bsize/blocksize;
-			else
-				j *= blocksize/curr_bsize;
-
-			blocksize = curr_bsize;
-			max_blocks = blk_size[major][minor] / (blocksize >> 10);
-		}
-        	if ((bh = breada (read_disk, j, blocksize, j * blocksize,
-					max_blocks * blocksize)) != NULL) {
-			mark_buffer_dirty(bh, 1);
-			brelse(bh);
-		} else {
-			/*
-			 * FIXME: Ugly, but set_blocksize() isnt safe ...
-			 */
-			curr_bsize = blksize_size[major][minor];
-			if (curr_bsize != blocksize)
-				goto diff_blocksize;
-
-			/*
-			 * It's a real read problem. FIXME, handle this
-			 * a better way.
-			 */
-			printk ( KERN_ALERT
-				 "read error, stopping reconstruction.\n");
-			mddev->busy--;
-			return 1;
-		}
-
-		/*
-		 * Let's sleep some if we are faster than our speed limit:
-		 */
-		while (blocksize*j/(jiffies-starttime+1)*HZ/1024 > SPEED_LIMIT)
-		{
-			current->state = TASK_INTERRUPTIBLE;
-			schedule_timeout(1);
-		}
-
-		/*
-		 * FIXME: put this status bar thing into /proc
-		 */
-		if (!(j%(max_blocks/100))) {
-			if (!(percent%10))
-				printk (" %03d%% done.\n",percent);
-			else
-				printk (".");
-			percent++;
-		}
+		md_mdelay(1000*1);
 	}
-	fsync_dev(read_disk);
-	printk("md: %s: sync done.\n", kdevname(read_disk));
-	mddev->busy--;
-	return 0;
+	return NOTIFY_DONE;
 }
 
-/*
- * This is a kernel thread which: syncs a spare disk with the active array
- *
- * the amount of foolproofing might seem to be a tad excessive, but an
- * early (not so error-safe) version of raid1syncd synced the first 0.5 gigs
- * of my root partition with the first 0.5 gigs of my /home partition ... so
- * i'm a bit nervous ;)
- */
-void mdsyncd (void *data)
-{
-	int i;
-	struct md_dev *mddev;
-	md_superblock_t *sb;
-	md_descriptor_t *spare;
-	unsigned long flags;
+struct notifier_block md_notifier = {
+	md_notify_reboot,
+	NULL,
+	0
+};
 
-	for (i = 0, mddev = md_dev; i < MAX_MD_DEV; i++, mddev++) {
-		if ((sb = mddev->sb) == NULL)
-			continue;
-		if (sb->active_disks == sb->raid_disks)
-			continue;
-		if (!sb->spare_disks)
-			continue;
-		if ((spare = get_spare(mddev)) == NULL)
-			continue;
-		if (!mddev->pers->mark_spare)
-			continue;
-		if (mddev->pers->mark_spare(mddev, spare, SPARE_WRITE))
-			continue;
-		if (md_do_sync(mddev) || (spare->state & (1 << MD_FAULTY_DEVICE))) {
-			mddev->pers->mark_spare(mddev, spare, SPARE_INACTIVE);
+void md__init raid_setup(char *str, int *ints)
+{
+	char tmpline[100];
+	int len, pos, nr, i;
+
+	len = strlen(str) + 1;
+	nr = 0;
+	pos = 0;
+
+	for (i = 0; i < len; i++) {
+		char c = str[i];
+
+		if (c == ',' || !c) {
+			tmpline[pos] = 0;
+			if (!strcmp(tmpline,"noautodetect"))
+				raid_setup_args.noautodetect = 1;
+			nr++;
+			pos = 0;
 			continue;
 		}
-		save_flags(flags);
-		cli();
-		mddev->pers->mark_spare(mddev, spare, SPARE_ACTIVE);
-		spare->state |= (1 << MD_SYNC_DEVICE);
-		spare->state |= (1 << MD_ACTIVE_DEVICE);
-		sb->spare_disks--;
-		sb->active_disks++;
-		mddev->sb_dirty = 1;
-		md_update_sb(mddev - md_dev);
-		restore_flags(flags);
+		tmpline[pos] = c;
+		pos++;
 	}
-	
+	raid_setup_args.set = 1;
+	return;
 }
 
 #ifdef CONFIG_MD_BOOT
 struct {
 	unsigned long set;
-	int pers[MAX_MD_DEV];
-	kdev_t devices[MAX_MD_DEV][MAX_REAL];
-} md_setup_args __initdata = {
+	int pers[MAX_MD_DEVS];
+	kdev_t devices[MAX_MD_DEVS][MAX_REAL];
+} md_setup_args md__initdata = {
 	0,{0},{{0}}
 };
 
@@ -1155,7 +3207,7 @@ struct {
  *             the MD devices (by specifying multiple "md=" lines)
  *             instead of just one.  -- KTK
  */
-int __init md_setup(char *str)
+static int __init md_setup(char *str)
 {
 	int minor, level, factor, fault, i;
 	kdev_t device;
@@ -1167,31 +3219,31 @@ int __init md_setup(char *str)
 	   get_option(&str, &fault) != 2) {
 		printk("md: Too few arguments supplied to md=.\n");
 		return 0;
-	} else if (minor >= MAX_MD_DEV) {
-		printk ("md: Minor device number too high.\n");
+	} else if (minor >= MAX_MD_DEVS) {
+ 		printk ("md: Minor device number too high.\n");
 		return 0;
 	} else if (md_setup_args.set & (1 << minor)) {
 		printk ("md: Warning - md=%d,... has been specified twice;\n"
 			"    will discard the first definition.\n", minor);
-	}
+ 	}
 	switch(level) {
 #ifdef CONFIG_MD_LINEAR
 	case -1:
 		level = LINEAR;
 		pername = "linear";
-		break;
+ 		break;
 #endif
 #ifdef CONFIG_MD_STRIPED
 	case 0:
 		level = STRIPED;
 		pername = "striped";
-		break;
+ 		break;
 #endif
 	default:
 		printk ("md: The kernel has not been configured for raid%d"
 			" support!\n", level);
 		return 0;
-	}
+ 	}
 	devnames = str;
 	for (i = 0; str; i++) {
 		if ((device = name_to_kdev_t(str))) {
@@ -1215,61 +3267,87 @@ int __init md_setup(char *str)
 	md_setup_args.set |= (1 << minor);
 	return 0;
 }
-
 #endif
 
+static void md_geninit (void)
+{
+	int i;
+
+	blksize_size[MD_MAJOR] = md_blocksizes;
+	max_readahead[MD_MAJOR] = md_maxreadahead;
+
+	for(i = 0; i < MAX_MD_DEVS; i++) {
+		md_blocksizes[i] = 1024;
+		md_maxreadahead[i] = MD_READAHEAD;
+		register_disk(&md_gendisk, MKDEV(MAJOR_NR,i), 1, &md_fops, 0);
+
+	}
+
+	printk("md.c: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
+
+#ifdef CONFIG_PROC_FS
+	create_proc_read_entry("mdstat", 0, NULL, md_status_read_proc, NULL);
+#endif
+}
+void hsm_init (void);
+void translucent_init (void);
 void linear_init (void);
 void raid0_init (void);
 void raid1_init (void);
 void raid5_init (void);
 
-int __init md_init (void)
+int md__init md_init (void)
 {
-  printk ("md driver %d.%d.%d MAX_MD_DEV=%d, MAX_REAL=%d\n",
-    MD_MAJOR_VERSION, MD_MINOR_VERSION, MD_PATCHLEVEL_VERSION,
-    MAX_MD_DEV, MAX_REAL);
+	printk (KERN_INFO "md driver %d.%d.%d MAX_MD_DEVS=%d, MAX_REAL=%d\n",
+			MD_MAJOR_VERSION, MD_MINOR_VERSION,
+			MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MAX_REAL);
+
+	if (register_blkdev (MD_MAJOR, "md", &md_fops))
+	{
+		printk (KERN_ALERT "Unable to get major %d for md\n", MD_MAJOR);
+		return (-1);
+	}
 
-  if (register_blkdev (MD_MAJOR, "md", &md_fops))
-  {
-    printk ("Unable to get major %d for md\n", MD_MAJOR);
-    return (-1);
-  }
+	blk_dev[MD_MAJOR].queue = md_get_queue;
 
-  blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
-  read_ahead[MD_MAJOR]=INT_MAX;
-  memset(md_dev, 0, MAX_MD_DEV * sizeof (struct md_dev));
-  md_gendisk.next=gendisk_head;
+	read_ahead[MD_MAJOR] = INT_MAX;
+	md_gendisk.next = gendisk_head;
 
-  gendisk_head=&md_gendisk;
+	gendisk_head = &md_gendisk;
 
-#if SUPPORT_RECONSTRUCTION
-  if ((md_sync_thread = md_register_thread(mdsyncd, NULL)) == NULL)
-    printk("md: bug: md_sync_thread == NULL\n");
-#endif /* SUPPORT_RECONSTRUCTION */
+	md_register_reboot_notifier(&md_notifier);
 
 #ifdef CONFIG_MD_LINEAR
-  linear_init ();
+	linear_init ();
 #endif
 #ifdef CONFIG_MD_STRIPED
-  raid0_init ();
+	raid0_init ();
 #endif
 #ifdef CONFIG_MD_MIRRORING
-  raid1_init ();
+	raid1_init ();
 #endif
 #ifdef CONFIG_MD_RAID5
-  raid5_init ();
+	raid5_init ();
 #endif
-  md_geninit();
-  return (0);
+#if defined(CONFIG_MD_RAID5) || defined(CONFIG_MD_RAID5_MODULE)
+        /*
+         * pick a XOR routine, runtime.
+         */
+	calibrate_xor_block();
+#endif
+	md_geninit();
+	return (0);
 }
 
 #ifdef CONFIG_MD_BOOT
-void __init md_setup_drive(void)
+static void __init md_setup_drive(void)
 {
+	if(md_setup_args.set)
+		do_md_setup(md_setup_args.str, md_setup_args.ints);
 	int minor, i;
 	kdev_t dev;
 
-	for (minor = 0; minor < MAX_MD_DEV; minor++) {
+	for (minor = 0; minor < MAX_MD_DEVS; minor++) {
 		if ((md_setup_args.set & (1 << minor)) == 0)
 			continue;
 		printk("md: Loading md%d.\n", minor);
@@ -1281,3 +3359,20 @@ void __init md_setup_drive(void)
 
 __setup("md=", md_setup);
 #endif
+
+MD_EXPORT_SYMBOL(md_size);
+MD_EXPORT_SYMBOL(register_md_personality);
+MD_EXPORT_SYMBOL(unregister_md_personality);
+MD_EXPORT_SYMBOL(partition_name);
+MD_EXPORT_SYMBOL(md_error);
+MD_EXPORT_SYMBOL(md_recover_arrays);
+MD_EXPORT_SYMBOL(md_register_thread);
+MD_EXPORT_SYMBOL(md_unregister_thread);
+MD_EXPORT_SYMBOL(md_update_sb);
+MD_EXPORT_SYMBOL(md_wakeup_thread);
+MD_EXPORT_SYMBOL(md_print_devices);
+MD_EXPORT_SYMBOL(find_rdev_nr);
+MD_EXPORT_SYMBOL(md_interrupt_thread);
+MD_EXPORT_SYMBOL(mddev_map);
+MD_EXPORT_SYMBOL(md_check_ordering);
+