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-rw-r--r--drivers/md/md.c3766
1 files changed, 3766 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
new file mode 100644
index 00000000000..04562add192
--- /dev/null
+++ b/drivers/md/md.c
@@ -0,0 +1,3766 @@
+/*
+ md.c : Multiple Devices driver for Linux
+ Copyright (C) 1998, 1999, 2000 Ingo Molnar
+
+ completely rewritten, based on the MD driver code from Marc Zyngier
+
+ Changes:
+
+ - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
+ - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
+ - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
+ - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
+ - kmod support by: Cyrus Durgin
+ - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
+ - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
+
+ - lots of fixes and improvements to the RAID1/RAID5 and generic
+ RAID code (such as request based resynchronization):
+
+ Neil Brown <neilb@cse.unsw.edu.au>.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ You should have received a copy of the GNU General Public License
+ (for example /usr/src/linux/COPYING); if not, write to the Free
+ Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/linkage.h>
+#include <linux/raid/md.h>
+#include <linux/sysctl.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/buffer_head.h> /* for invalidate_bdev */
+#include <linux/suspend.h>
+
+#include <linux/init.h>
+
+#ifdef CONFIG_KMOD
+#include <linux/kmod.h>
+#endif
+
+#include <asm/unaligned.h>
+
+#define MAJOR_NR MD_MAJOR
+#define MD_DRIVER
+
+/* 63 partitions with the alternate major number (mdp) */
+#define MdpMinorShift 6
+
+#define DEBUG 0
+#define dprintk(x...) ((void)(DEBUG && printk(x)))
+
+
+#ifndef MODULE
+static void autostart_arrays (int part);
+#endif
+
+static mdk_personality_t *pers[MAX_PERSONALITY];
+static DEFINE_SPINLOCK(pers_lock);
+
+/*
+ * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
+ * is 1000 KB/sec, so the extra system load does not show up that much.
+ * Increase it if you want to have more _guaranteed_ speed. Note that
+ * the RAID driver will use the maximum available bandwith if the IO
+ * subsystem is idle. There is also an 'absolute maximum' reconstruction
+ * speed limit - in case reconstruction slows down your system despite
+ * idle IO detection.
+ *
+ * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
+ */
+
+static int sysctl_speed_limit_min = 1000;
+static int sysctl_speed_limit_max = 200000;
+
+static struct ctl_table_header *raid_table_header;
+
+static ctl_table raid_table[] = {
+ {
+ .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
+ .procname = "speed_limit_min",
+ .data = &sysctl_speed_limit_min,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
+ .procname = "speed_limit_max",
+ .data = &sysctl_speed_limit_max,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ { .ctl_name = 0 }
+};
+
+static ctl_table raid_dir_table[] = {
+ {
+ .ctl_name = DEV_RAID,
+ .procname = "raid",
+ .maxlen = 0,
+ .mode = 0555,
+ .child = raid_table,
+ },
+ { .ctl_name = 0 }
+};
+
+static ctl_table raid_root_table[] = {
+ {
+ .ctl_name = CTL_DEV,
+ .procname = "dev",
+ .maxlen = 0,
+ .mode = 0555,
+ .child = raid_dir_table,
+ },
+ { .ctl_name = 0 }
+};
+
+static struct block_device_operations md_fops;
+
+/*
+ * Enables to iterate over all existing md arrays
+ * all_mddevs_lock protects this list.
+ */
+static LIST_HEAD(all_mddevs);
+static DEFINE_SPINLOCK(all_mddevs_lock);
+
+
+/*
+ * iterates through all used mddevs in the system.
+ * We take care to grab the all_mddevs_lock whenever navigating
+ * the list, and to always hold a refcount when unlocked.
+ * Any code which breaks out of this loop while own
+ * a reference to the current mddev and must mddev_put it.
+ */
+#define ITERATE_MDDEV(mddev,tmp) \
+ \
+ for (({ spin_lock(&all_mddevs_lock); \
+ tmp = all_mddevs.next; \
+ mddev = NULL;}); \
+ ({ if (tmp != &all_mddevs) \
+ mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
+ spin_unlock(&all_mddevs_lock); \
+ if (mddev) mddev_put(mddev); \
+ mddev = list_entry(tmp, mddev_t, all_mddevs); \
+ tmp != &all_mddevs;}); \
+ ({ spin_lock(&all_mddevs_lock); \
+ tmp = tmp->next;}) \
+ )
+
+
+static int md_fail_request (request_queue_t *q, struct bio *bio)
+{
+ bio_io_error(bio, bio->bi_size);
+ return 0;
+}
+
+static inline mddev_t *mddev_get(mddev_t *mddev)
+{
+ atomic_inc(&mddev->active);
+ return mddev;
+}
+
+static void mddev_put(mddev_t *mddev)
+{
+ if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
+ return;
+ if (!mddev->raid_disks && list_empty(&mddev->disks)) {
+ list_del(&mddev->all_mddevs);
+ blk_put_queue(mddev->queue);
+ kfree(mddev);
+ }
+ spin_unlock(&all_mddevs_lock);
+}
+
+static mddev_t * mddev_find(dev_t unit)
+{
+ mddev_t *mddev, *new = NULL;
+
+ retry:
+ spin_lock(&all_mddevs_lock);
+ list_for_each_entry(mddev, &all_mddevs, all_mddevs)
+ if (mddev->unit == unit) {
+ mddev_get(mddev);
+ spin_unlock(&all_mddevs_lock);
+ if (new)
+ kfree(new);
+ return mddev;
+ }
+
+ if (new) {
+ list_add(&new->all_mddevs, &all_mddevs);
+ spin_unlock(&all_mddevs_lock);
+ return new;
+ }
+ spin_unlock(&all_mddevs_lock);
+
+ new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL);
+ if (!new)
+ return NULL;
+
+ memset(new, 0, sizeof(*new));
+
+ new->unit = unit;
+ if (MAJOR(unit) == MD_MAJOR)
+ new->md_minor = MINOR(unit);
+ else
+ new->md_minor = MINOR(unit) >> MdpMinorShift;
+
+ init_MUTEX(&new->reconfig_sem);
+ INIT_LIST_HEAD(&new->disks);
+ INIT_LIST_HEAD(&new->all_mddevs);
+ init_timer(&new->safemode_timer);
+ atomic_set(&new->active, 1);
+
+ new->queue = blk_alloc_queue(GFP_KERNEL);
+ if (!new->queue) {
+ kfree(new);
+ return NULL;
+ }
+
+ blk_queue_make_request(new->queue, md_fail_request);
+
+ goto retry;
+}
+
+static inline int mddev_lock(mddev_t * mddev)
+{
+ return down_interruptible(&mddev->reconfig_sem);
+}
+
+static inline void mddev_lock_uninterruptible(mddev_t * mddev)
+{
+ down(&mddev->reconfig_sem);
+}
+
+static inline int mddev_trylock(mddev_t * mddev)
+{
+ return down_trylock(&mddev->reconfig_sem);
+}
+
+static inline void mddev_unlock(mddev_t * mddev)
+{
+ up(&mddev->reconfig_sem);
+
+ if (mddev->thread)
+ md_wakeup_thread(mddev->thread);
+}
+
+mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
+{
+ mdk_rdev_t * rdev;
+ struct list_head *tmp;
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->desc_nr == nr)
+ return rdev;
+ }
+ return NULL;
+}
+
+static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
+{
+ struct list_head *tmp;
+ mdk_rdev_t *rdev;
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->bdev->bd_dev == dev)
+ return rdev;
+ }
+ return NULL;
+}
+
+inline static sector_t calc_dev_sboffset(struct block_device *bdev)
+{
+ sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
+ return MD_NEW_SIZE_BLOCKS(size);
+}
+
+static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
+{
+ sector_t size;
+
+ size = rdev->sb_offset;
+
+ if (chunk_size)
+ size &= ~((sector_t)chunk_size/1024 - 1);
+ return size;
+}
+
+static int alloc_disk_sb(mdk_rdev_t * rdev)
+{
+ if (rdev->sb_page)
+ MD_BUG();
+
+ rdev->sb_page = alloc_page(GFP_KERNEL);
+ if (!rdev->sb_page) {
+ printk(KERN_ALERT "md: out of memory.\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void free_disk_sb(mdk_rdev_t * rdev)
+{
+ if (rdev->sb_page) {
+ page_cache_release(rdev->sb_page);
+ rdev->sb_loaded = 0;
+ rdev->sb_page = NULL;
+ rdev->sb_offset = 0;
+ rdev->size = 0;
+ }
+}
+
+
+static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
+{
+ if (bio->bi_size)
+ return 1;
+
+ complete((struct completion*)bio->bi_private);
+ return 0;
+}
+
+static int sync_page_io(struct block_device *bdev, sector_t sector, int size,
+ struct page *page, int rw)
+{
+ struct bio *bio = bio_alloc(GFP_KERNEL, 1);
+ struct completion event;
+ int ret;
+
+ rw |= (1 << BIO_RW_SYNC);
+
+ bio->bi_bdev = bdev;
+ bio->bi_sector = sector;
+ bio_add_page(bio, page, size, 0);
+ init_completion(&event);
+ bio->bi_private = &event;
+ bio->bi_end_io = bi_complete;
+ submit_bio(rw, bio);
+ wait_for_completion(&event);
+
+ ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
+ bio_put(bio);
+ return ret;
+}
+
+static int read_disk_sb(mdk_rdev_t * rdev)
+{
+ char b[BDEVNAME_SIZE];
+ if (!rdev->sb_page) {
+ MD_BUG();
+ return -EINVAL;
+ }
+ if (rdev->sb_loaded)
+ return 0;
+
+
+ if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, MD_SB_BYTES, rdev->sb_page, READ))
+ goto fail;
+ rdev->sb_loaded = 1;
+ return 0;
+
+fail:
+ printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
+ bdevname(rdev->bdev,b));
+ return -EINVAL;
+}
+
+static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
+{
+ if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
+ (sb1->set_uuid1 == sb2->set_uuid1) &&
+ (sb1->set_uuid2 == sb2->set_uuid2) &&
+ (sb1->set_uuid3 == sb2->set_uuid3))
+
+ return 1;
+
+ return 0;
+}
+
+
+static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
+{
+ int ret;
+ mdp_super_t *tmp1, *tmp2;
+
+ tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
+ tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
+
+ if (!tmp1 || !tmp2) {
+ ret = 0;
+ printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
+ goto abort;
+ }
+
+ *tmp1 = *sb1;
+ *tmp2 = *sb2;
+
+ /*
+ * nr_disks is not constant
+ */
+ tmp1->nr_disks = 0;
+ tmp2->nr_disks = 0;
+
+ if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
+ ret = 0;
+ else
+ ret = 1;
+
+abort:
+ if (tmp1)
+ kfree(tmp1);
+ if (tmp2)
+ kfree(tmp2);
+
+ return ret;
+}
+
+static unsigned int calc_sb_csum(mdp_super_t * sb)
+{
+ unsigned int disk_csum, csum;
+
+ disk_csum = sb->sb_csum;
+ sb->sb_csum = 0;
+ csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
+ sb->sb_csum = disk_csum;
+ return csum;
+}
+
+
+/*
+ * Handle superblock details.
+ * We want to be able to handle multiple superblock formats
+ * so we have a common interface to them all, and an array of
+ * different handlers.
+ * We rely on user-space to write the initial superblock, and support
+ * reading and updating of superblocks.
+ * Interface methods are:
+ * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
+ * loads and validates a superblock on dev.
+ * if refdev != NULL, compare superblocks on both devices
+ * Return:
+ * 0 - dev has a superblock that is compatible with refdev
+ * 1 - dev has a superblock that is compatible and newer than refdev
+ * so dev should be used as the refdev in future
+ * -EINVAL superblock incompatible or invalid
+ * -othererror e.g. -EIO
+ *
+ * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
+ * Verify that dev is acceptable into mddev.
+ * The first time, mddev->raid_disks will be 0, and data from
+ * dev should be merged in. Subsequent calls check that dev
+ * is new enough. Return 0 or -EINVAL
+ *
+ * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
+ * Update the superblock for rdev with data in mddev
+ * This does not write to disc.
+ *
+ */
+
+struct super_type {
+ char *name;
+ struct module *owner;
+ int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
+ int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
+ void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
+};
+
+/*
+ * load_super for 0.90.0
+ */
+static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
+{
+ char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+ mdp_super_t *sb;
+ int ret;
+ sector_t sb_offset;
+
+ /*
+ * Calculate the position of the superblock,
+ * it's at the end of the disk.
+ *
+ * It also happens to be a multiple of 4Kb.
+ */
+ sb_offset = calc_dev_sboffset(rdev->bdev);
+ rdev->sb_offset = sb_offset;
+
+ ret = read_disk_sb(rdev);
+ if (ret) return ret;
+
+ ret = -EINVAL;
+
+ bdevname(rdev->bdev, b);
+ sb = (mdp_super_t*)page_address(rdev->sb_page);
+
+ if (sb->md_magic != MD_SB_MAGIC) {
+ printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
+ b);
+ goto abort;
+ }
+
+ if (sb->major_version != 0 ||
+ sb->minor_version != 90) {
+ printk(KERN_WARNING "Bad version number %d.%d on %s\n",
+ sb->major_version, sb->minor_version,
+ b);
+ goto abort;
+ }
+
+ if (sb->raid_disks <= 0)
+ goto abort;
+
+ if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
+ printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
+ b);
+ goto abort;
+ }
+
+ rdev->preferred_minor = sb->md_minor;
+ rdev->data_offset = 0;
+
+ if (sb->level == LEVEL_MULTIPATH)
+ rdev->desc_nr = -1;
+ else
+ rdev->desc_nr = sb->this_disk.number;
+
+ if (refdev == 0)
+ ret = 1;
+ else {
+ __u64 ev1, ev2;
+ mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
+ if (!uuid_equal(refsb, sb)) {
+ printk(KERN_WARNING "md: %s has different UUID to %s\n",
+ b, bdevname(refdev->bdev,b2));
+ goto abort;
+ }
+ if (!sb_equal(refsb, sb)) {
+ printk(KERN_WARNING "md: %s has same UUID"
+ " but different superblock to %s\n",
+ b, bdevname(refdev->bdev, b2));
+ goto abort;
+ }
+ ev1 = md_event(sb);
+ ev2 = md_event(refsb);
+ if (ev1 > ev2)
+ ret = 1;
+ else
+ ret = 0;
+ }
+ rdev->size = calc_dev_size(rdev, sb->chunk_size);
+
+ abort:
+ return ret;
+}
+
+/*
+ * validate_super for 0.90.0
+ */
+static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+ mdp_disk_t *desc;
+ mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
+
+ if (mddev->raid_disks == 0) {
+ mddev->major_version = 0;
+ mddev->minor_version = sb->minor_version;
+ mddev->patch_version = sb->patch_version;
+ mddev->persistent = ! sb->not_persistent;
+ mddev->chunk_size = sb->chunk_size;
+ mddev->ctime = sb->ctime;
+ mddev->utime = sb->utime;
+ mddev->level = sb->level;
+ mddev->layout = sb->layout;
+ mddev->raid_disks = sb->raid_disks;
+ mddev->size = sb->size;
+ mddev->events = md_event(sb);
+
+ if (sb->state & (1<<MD_SB_CLEAN))
+ mddev->recovery_cp = MaxSector;
+ else {
+ if (sb->events_hi == sb->cp_events_hi &&
+ sb->events_lo == sb->cp_events_lo) {
+ mddev->recovery_cp = sb->recovery_cp;
+ } else
+ mddev->recovery_cp = 0;
+ }
+
+ memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
+ memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
+ memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
+ memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
+
+ mddev->max_disks = MD_SB_DISKS;
+ } else {
+ __u64 ev1;
+ ev1 = md_event(sb);
+ ++ev1;
+ if (ev1 < mddev->events)
+ return -EINVAL;
+ }
+ if (mddev->level != LEVEL_MULTIPATH) {
+ rdev->raid_disk = -1;
+ rdev->in_sync = rdev->faulty = 0;
+ desc = sb->disks + rdev->desc_nr;
+
+ if (desc->state & (1<<MD_DISK_FAULTY))
+ rdev->faulty = 1;
+ else if (desc->state & (1<<MD_DISK_SYNC) &&
+ desc->raid_disk < mddev->raid_disks) {
+ rdev->in_sync = 1;
+ rdev->raid_disk = desc->raid_disk;
+ }
+ }
+ return 0;
+}
+
+/*
+ * sync_super for 0.90.0
+ */
+static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+ mdp_super_t *sb;
+ struct list_head *tmp;
+ mdk_rdev_t *rdev2;
+ int next_spare = mddev->raid_disks;
+
+ /* make rdev->sb match mddev data..
+ *
+ * 1/ zero out disks
+ * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
+ * 3/ any empty disks < next_spare become removed
+ *
+ * disks[0] gets initialised to REMOVED because
+ * we cannot be sure from other fields if it has
+ * been initialised or not.
+ */
+ int i;
+ int active=0, working=0,failed=0,spare=0,nr_disks=0;
+
+ sb = (mdp_super_t*)page_address(rdev->sb_page);
+
+ memset(sb, 0, sizeof(*sb));
+
+ sb->md_magic = MD_SB_MAGIC;
+ sb->major_version = mddev->major_version;
+ sb->minor_version = mddev->minor_version;
+ sb->patch_version = mddev->patch_version;
+ sb->gvalid_words = 0; /* ignored */
+ memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
+ memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
+ memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
+ memcpy(&sb->set_uuid3, mddev->uuid+12,4);
+
+ sb->ctime = mddev->ctime;
+ sb->level = mddev->level;
+ sb->size = mddev->size;
+ sb->raid_disks = mddev->raid_disks;
+ sb->md_minor = mddev->md_minor;
+ sb->not_persistent = !mddev->persistent;
+ sb->utime = mddev->utime;
+ sb->state = 0;
+ sb->events_hi = (mddev->events>>32);
+ sb->events_lo = (u32)mddev->events;
+
+ if (mddev->in_sync)
+ {
+ sb->recovery_cp = mddev->recovery_cp;
+ sb->cp_events_hi = (mddev->events>>32);
+ sb->cp_events_lo = (u32)mddev->events;
+ if (mddev->recovery_cp == MaxSector)
+ sb->state = (1<< MD_SB_CLEAN);
+ } else
+ sb->recovery_cp = 0;
+
+ sb->layout = mddev->layout;
+ sb->chunk_size = mddev->chunk_size;
+
+ sb->disks[0].state = (1<<MD_DISK_REMOVED);
+ ITERATE_RDEV(mddev,rdev2,tmp) {
+ mdp_disk_t *d;
+ if (rdev2->raid_disk >= 0 && rdev2->in_sync && !rdev2->faulty)
+ rdev2->desc_nr = rdev2->raid_disk;
+ else
+ rdev2->desc_nr = next_spare++;
+ d = &sb->disks[rdev2->desc_nr];
+ nr_disks++;
+ d->number = rdev2->desc_nr;
+ d->major = MAJOR(rdev2->bdev->bd_dev);
+ d->minor = MINOR(rdev2->bdev->bd_dev);
+ if (rdev2->raid_disk >= 0 && rdev->in_sync && !rdev2->faulty)
+ d->raid_disk = rdev2->raid_disk;
+ else
+ d->raid_disk = rdev2->desc_nr; /* compatibility */
+ if (rdev2->faulty) {
+ d->state = (1<<MD_DISK_FAULTY);
+ failed++;
+ } else if (rdev2->in_sync) {
+ d->state = (1<<MD_DISK_ACTIVE);
+ d->state |= (1<<MD_DISK_SYNC);
+ active++;
+ working++;
+ } else {
+ d->state = 0;
+ spare++;
+ working++;
+ }
+ }
+
+ /* now set the "removed" and "faulty" bits on any missing devices */
+ for (i=0 ; i < mddev->raid_disks ; i++) {
+ mdp_disk_t *d = &sb->disks[i];
+ if (d->state == 0 && d->number == 0) {
+ d->number = i;
+ d->raid_disk = i;
+ d->state = (1<<MD_DISK_REMOVED);
+ d->state |= (1<<MD_DISK_FAULTY);
+ failed++;
+ }
+ }
+ sb->nr_disks = nr_disks;
+ sb->active_disks = active;
+ sb->working_disks = working;
+ sb->failed_disks = failed;
+ sb->spare_disks = spare;
+
+ sb->this_disk = sb->disks[rdev->desc_nr];
+ sb->sb_csum = calc_sb_csum(sb);
+}
+
+/*
+ * version 1 superblock
+ */
+
+static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
+{
+ unsigned int disk_csum, csum;
+ unsigned long long newcsum;
+ int size = 256 + le32_to_cpu(sb->max_dev)*2;
+ unsigned int *isuper = (unsigned int*)sb;
+ int i;
+
+ disk_csum = sb->sb_csum;
+ sb->sb_csum = 0;
+ newcsum = 0;
+ for (i=0; size>=4; size -= 4 )
+ newcsum += le32_to_cpu(*isuper++);
+
+ if (size == 2)
+ newcsum += le16_to_cpu(*(unsigned short*) isuper);
+
+ csum = (newcsum & 0xffffffff) + (newcsum >> 32);
+ sb->sb_csum = disk_csum;
+ return cpu_to_le32(csum);
+}
+
+static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
+{
+ struct mdp_superblock_1 *sb;
+ int ret;
+ sector_t sb_offset;
+ char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+
+ /*
+ * Calculate the position of the superblock.
+ * It is always aligned to a 4K boundary and
+ * depeding on minor_version, it can be:
+ * 0: At least 8K, but less than 12K, from end of device
+ * 1: At start of device
+ * 2: 4K from start of device.
+ */
+ switch(minor_version) {
+ case 0:
+ sb_offset = rdev->bdev->bd_inode->i_size >> 9;
+ sb_offset -= 8*2;
+ sb_offset &= ~(4*2-1);
+ /* convert from sectors to K */
+ sb_offset /= 2;
+ break;
+ case 1:
+ sb_offset = 0;
+ break;
+ case 2:
+ sb_offset = 4;
+ break;
+ default:
+ return -EINVAL;
+ }
+ rdev->sb_offset = sb_offset;
+
+ ret = read_disk_sb(rdev);
+ if (ret) return ret;
+
+
+ sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
+
+ if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
+ sb->major_version != cpu_to_le32(1) ||
+ le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
+ le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
+ sb->feature_map != 0)
+ return -EINVAL;
+
+ if (calc_sb_1_csum(sb) != sb->sb_csum) {
+ printk("md: invalid superblock checksum on %s\n",
+ bdevname(rdev->bdev,b));
+ return -EINVAL;
+ }
+ if (le64_to_cpu(sb->data_size) < 10) {
+ printk("md: data_size too small on %s\n",
+ bdevname(rdev->bdev,b));
+ return -EINVAL;
+ }
+ rdev->preferred_minor = 0xffff;
+ rdev->data_offset = le64_to_cpu(sb->data_offset);
+
+ if (refdev == 0)
+ return 1;
+ else {
+ __u64 ev1, ev2;
+ struct mdp_superblock_1 *refsb =
+ (struct mdp_superblock_1*)page_address(refdev->sb_page);
+
+ if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
+ sb->level != refsb->level ||
+ sb->layout != refsb->layout ||
+ sb->chunksize != refsb->chunksize) {
+ printk(KERN_WARNING "md: %s has strangely different"
+ " superblock to %s\n",
+ bdevname(rdev->bdev,b),
+ bdevname(refdev->bdev,b2));
+ return -EINVAL;
+ }
+ ev1 = le64_to_cpu(sb->events);
+ ev2 = le64_to_cpu(refsb->events);
+
+ if (ev1 > ev2)
+ return 1;
+ }
+ if (minor_version)
+ rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
+ else
+ rdev->size = rdev->sb_offset;
+ if (rdev->size < le64_to_cpu(sb->data_size)/2)
+ return -EINVAL;
+ rdev->size = le64_to_cpu(sb->data_size)/2;
+ if (le32_to_cpu(sb->chunksize))
+ rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
+ return 0;
+}
+
+static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+ struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
+
+ if (mddev->raid_disks == 0) {
+ mddev->major_version = 1;
+ mddev->patch_version = 0;
+ mddev->persistent = 1;
+ mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
+ mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
+ mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
+ mddev->level = le32_to_cpu(sb->level);
+ mddev->layout = le32_to_cpu(sb->layout);
+ mddev->raid_disks = le32_to_cpu(sb->raid_disks);
+ mddev->size = le64_to_cpu(sb->size)/2;
+ mddev->events = le64_to_cpu(sb->events);
+
+ mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
+ memcpy(mddev->uuid, sb->set_uuid, 16);
+
+ mddev->max_disks = (4096-256)/2;
+ } else {
+ __u64 ev1;
+ ev1 = le64_to_cpu(sb->events);
+ ++ev1;
+ if (ev1 < mddev->events)
+ return -EINVAL;
+ }
+
+ if (mddev->level != LEVEL_MULTIPATH) {
+ int role;
+ rdev->desc_nr = le32_to_cpu(sb->dev_number);
+ role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
+ switch(role) {
+ case 0xffff: /* spare */
+ rdev->in_sync = 0;
+ rdev->faulty = 0;
+ rdev->raid_disk = -1;
+ break;
+ case 0xfffe: /* faulty */
+ rdev->in_sync = 0;
+ rdev->faulty = 1;
+ rdev->raid_disk = -1;
+ break;
+ default:
+ rdev->in_sync = 1;
+ rdev->faulty = 0;
+ rdev->raid_disk = role;
+ break;
+ }
+ }
+ return 0;
+}
+
+static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+ struct mdp_superblock_1 *sb;
+ struct list_head *tmp;
+ mdk_rdev_t *rdev2;
+ int max_dev, i;
+ /* make rdev->sb match mddev and rdev data. */
+
+ sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
+
+ sb->feature_map = 0;
+ sb->pad0 = 0;
+ memset(sb->pad1, 0, sizeof(sb->pad1));
+ memset(sb->pad2, 0, sizeof(sb->pad2));
+ memset(sb->pad3, 0, sizeof(sb->pad3));
+
+ sb->utime = cpu_to_le64((__u64)mddev->utime);
+ sb->events = cpu_to_le64(mddev->events);
+ if (mddev->in_sync)
+ sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
+ else
+ sb->resync_offset = cpu_to_le64(0);
+
+ max_dev = 0;
+ ITERATE_RDEV(mddev,rdev2,tmp)
+ if (rdev2->desc_nr+1 > max_dev)
+ max_dev = rdev2->desc_nr+1;
+
+ sb->max_dev = cpu_to_le32(max_dev);
+ for (i=0; i<max_dev;i++)
+ sb->dev_roles[i] = cpu_to_le16(0xfffe);
+
+ ITERATE_RDEV(mddev,rdev2,tmp) {
+ i = rdev2->desc_nr;
+ if (rdev2->faulty)
+ sb->dev_roles[i] = cpu_to_le16(0xfffe);
+ else if (rdev2->in_sync)
+ sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
+ else
+ sb->dev_roles[i] = cpu_to_le16(0xffff);
+ }
+
+ sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
+ sb->sb_csum = calc_sb_1_csum(sb);
+}
+
+
+struct super_type super_types[] = {
+ [0] = {
+ .name = "0.90.0",
+ .owner = THIS_MODULE,
+ .load_super = super_90_load,
+ .validate_super = super_90_validate,
+ .sync_super = super_90_sync,
+ },
+ [1] = {
+ .name = "md-1",
+ .owner = THIS_MODULE,
+ .load_super = super_1_load,
+ .validate_super = super_1_validate,
+ .sync_super = super_1_sync,
+ },
+};
+
+static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
+{
+ struct list_head *tmp;
+ mdk_rdev_t *rdev;
+
+ ITERATE_RDEV(mddev,rdev,tmp)
+ if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
+ return rdev;
+
+ return NULL;
+}
+
+static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
+{
+ struct list_head *tmp;
+ mdk_rdev_t *rdev;
+
+ ITERATE_RDEV(mddev1,rdev,tmp)
+ if (match_dev_unit(mddev2, rdev))
+ return 1;
+
+ return 0;
+}
+
+static LIST_HEAD(pending_raid_disks);
+
+static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
+{
+ mdk_rdev_t *same_pdev;
+ char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+
+ if (rdev->mddev) {
+ MD_BUG();
+ return -EINVAL;
+ }
+ same_pdev = match_dev_unit(mddev, rdev);
+ if (same_pdev)
+ printk(KERN_WARNING
+ "%s: WARNING: %s appears to be on the same physical"
+ " disk as %s. True\n protection against single-disk"
+ " failure might be compromised.\n",
+ mdname(mddev), bdevname(rdev->bdev,b),
+ bdevname(same_pdev->bdev,b2));
+
+ /* Verify rdev->desc_nr is unique.
+ * If it is -1, assign a free number, else
+ * check number is not in use
+ */
+ if (rdev->desc_nr < 0) {
+ int choice = 0;
+ if (mddev->pers) choice = mddev->raid_disks;
+ while (find_rdev_nr(mddev, choice))
+ choice++;
+ rdev->desc_nr = choice;
+ } else {
+ if (find_rdev_nr(mddev, rdev->desc_nr))
+ return -EBUSY;
+ }
+
+ list_add(&rdev->same_set, &mddev->disks);
+ rdev->mddev = mddev;
+ printk(KERN_INFO "md: bind<%s>\n", bdevname(rdev->bdev,b));
+ return 0;
+}
+
+static void unbind_rdev_from_array(mdk_rdev_t * rdev)
+{
+ char b[BDEVNAME_SIZE];
+ if (!rdev->mddev) {
+ MD_BUG();
+ return;
+ }
+ list_del_init(&rdev->same_set);
+ printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
+ rdev->mddev = NULL;
+}
+
+/*
+ * prevent the device from being mounted, repartitioned or
+ * otherwise reused by a RAID array (or any other kernel
+ * subsystem), by bd_claiming the device.
+ */
+static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
+{
+ int err = 0;
+ struct block_device *bdev;
+ char b[BDEVNAME_SIZE];
+
+ bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
+ if (IS_ERR(bdev)) {
+ printk(KERN_ERR "md: could not open %s.\n",
+ __bdevname(dev, b));
+ return PTR_ERR(bdev);
+ }
+ err = bd_claim(bdev, rdev);
+ if (err) {
+ printk(KERN_ERR "md: could not bd_claim %s.\n",
+ bdevname(bdev, b));
+ blkdev_put(bdev);
+ return err;
+ }
+ rdev->bdev = bdev;
+ return err;
+}
+
+static void unlock_rdev(mdk_rdev_t *rdev)
+{
+ struct block_device *bdev = rdev->bdev;
+ rdev->bdev = NULL;
+ if (!bdev)
+ MD_BUG();
+ bd_release(bdev);
+ blkdev_put(bdev);
+}
+
+void md_autodetect_dev(dev_t dev);
+
+static void export_rdev(mdk_rdev_t * rdev)
+{
+ char b[BDEVNAME_SIZE];
+ printk(KERN_INFO "md: export_rdev(%s)\n",
+ bdevname(rdev->bdev,b));
+ if (rdev->mddev)
+ MD_BUG();
+ free_disk_sb(rdev);
+ list_del_init(&rdev->same_set);
+#ifndef MODULE
+ md_autodetect_dev(rdev->bdev->bd_dev);
+#endif
+ unlock_rdev(rdev);
+ kfree(rdev);
+}
+
+static void kick_rdev_from_array(mdk_rdev_t * rdev)
+{
+ unbind_rdev_from_array(rdev);
+ export_rdev(rdev);
+}
+
+static void export_array(mddev_t *mddev)
+{
+ struct list_head *tmp;
+ mdk_rdev_t *rdev;
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (!rdev->mddev) {
+ MD_BUG();
+ continue;
+ }
+ kick_rdev_from_array(rdev);
+ }
+ if (!list_empty(&mddev->disks))
+ MD_BUG();
+ mddev->raid_disks = 0;
+ mddev->major_version = 0;
+}
+
+static void print_desc(mdp_disk_t *desc)
+{
+ printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
+ desc->major,desc->minor,desc->raid_disk,desc->state);
+}
+
+static void print_sb(mdp_super_t *sb)
+{
+ int i;
+
+ printk(KERN_INFO
+ "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
+ sb->major_version, sb->minor_version, sb->patch_version,
+ sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
+ sb->ctime);
+ printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
+ sb->level, sb->size, sb->nr_disks, sb->raid_disks,
+ sb->md_minor, sb->layout, sb->chunk_size);
+ printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
+ " FD:%d SD:%d CSUM:%08x E:%08lx\n",
+ sb->utime, sb->state, sb->active_disks, sb->working_disks,
+ sb->failed_disks, sb->spare_disks,
+ sb->sb_csum, (unsigned long)sb->events_lo);
+
+ printk(KERN_INFO);
+ for (i = 0; i < MD_SB_DISKS; i++) {
+ mdp_disk_t *desc;
+
+ desc = sb->disks + i;
+ if (desc->number || desc->major || desc->minor ||
+ desc->raid_disk || (desc->state && (desc->state != 4))) {
+ printk(" D %2d: ", i);
+ print_desc(desc);
+ }
+ }
+ printk(KERN_INFO "md: THIS: ");
+ print_desc(&sb->this_disk);
+
+}
+
+static void print_rdev(mdk_rdev_t *rdev)
+{
+ char b[BDEVNAME_SIZE];
+ printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
+ bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
+ rdev->faulty, rdev->in_sync, rdev->desc_nr);
+ if (rdev->sb_loaded) {
+ printk(KERN_INFO "md: rdev superblock:\n");
+ print_sb((mdp_super_t*)page_address(rdev->sb_page));
+ } else
+ printk(KERN_INFO "md: no rdev superblock!\n");
+}
+
+void md_print_devices(void)
+{
+ struct list_head *tmp, *tmp2;
+ mdk_rdev_t *rdev;
+ mddev_t *mddev;
+ char b[BDEVNAME_SIZE];
+
+ printk("\n");
+ printk("md: **********************************\n");
+ printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
+ printk("md: **********************************\n");
+ ITERATE_MDDEV(mddev,tmp) {
+ printk("%s: ", mdname(mddev));
+
+ ITERATE_RDEV(mddev,rdev,tmp2)
+ printk("<%s>", bdevname(rdev->bdev,b));
+ printk("\n");
+
+ ITERATE_RDEV(mddev,rdev,tmp2)
+ print_rdev(rdev);
+ }
+ printk("md: **********************************\n");
+ printk("\n");
+}
+
+
+static int write_disk_sb(mdk_rdev_t * rdev)
+{
+ char b[BDEVNAME_SIZE];
+ if (!rdev->sb_loaded) {
+ MD_BUG();
+ return 1;
+ }
+ if (rdev->faulty) {
+ MD_BUG();
+ return 1;
+ }
+
+ dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
+ bdevname(rdev->bdev,b),
+ (unsigned long long)rdev->sb_offset);
+
+ if (sync_page_io(rdev->bdev, rdev->sb_offset<<1, MD_SB_BYTES, rdev->sb_page, WRITE))
+ return 0;
+
+ printk("md: write_disk_sb failed for device %s\n",
+ bdevname(rdev->bdev,b));
+ return 1;
+}
+
+static void sync_sbs(mddev_t * mddev)
+{
+ mdk_rdev_t *rdev;
+ struct list_head *tmp;
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ super_types[mddev->major_version].
+ sync_super(mddev, rdev);
+ rdev->sb_loaded = 1;
+ }
+}
+
+static void md_update_sb(mddev_t * mddev)
+{
+ int err, count = 100;
+ struct list_head *tmp;
+ mdk_rdev_t *rdev;
+
+ mddev->sb_dirty = 0;
+repeat:
+ mddev->utime = get_seconds();
+ mddev->events ++;
+
+ if (!mddev->events) {
+ /*
+ * oops, this 64-bit counter should never wrap.
+ * Either we are in around ~1 trillion A.C., assuming
+ * 1 reboot per second, or we have a bug:
+ */
+ MD_BUG();
+ mddev->events --;
+ }
+ sync_sbs(mddev);
+
+ /*
+ * do not write anything to disk if using
+ * nonpersistent superblocks
+ */
+ if (!mddev->persistent)
+ return;
+
+ dprintk(KERN_INFO
+ "md: updating %s RAID superblock on device (in sync %d)\n",
+ mdname(mddev),mddev->in_sync);
+
+ err = 0;
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ char b[BDEVNAME_SIZE];
+ dprintk(KERN_INFO "md: ");
+ if (rdev->faulty)
+ dprintk("(skipping faulty ");
+
+ dprintk("%s ", bdevname(rdev->bdev,b));
+ if (!rdev->faulty) {
+ err += write_disk_sb(rdev);
+ } else
+ dprintk(")\n");
+ if (!err && mddev->level == LEVEL_MULTIPATH)
+ /* only need to write one superblock... */
+ break;
+ }
+ if (err) {
+ if (--count) {
+ printk(KERN_ERR "md: errors occurred during superblock"
+ " update, repeating\n");
+ goto repeat;
+ }
+ printk(KERN_ERR \
+ "md: excessive errors occurred during superblock update, exiting\n");
+ }
+}
+
+/*
+ * Import a device. If 'super_format' >= 0, then sanity check the superblock
+ *
+ * mark the device faulty if:
+ *
+ * - the device is nonexistent (zero size)
+ * - the device has no valid superblock
+ *
+ * a faulty rdev _never_ has rdev->sb set.
+ */
+static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
+{
+ char b[BDEVNAME_SIZE];
+ int err;
+ mdk_rdev_t *rdev;
+ sector_t size;
+
+ rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL);
+ if (!rdev) {
+ printk(KERN_ERR "md: could not alloc mem for new device!\n");
+ return ERR_PTR(-ENOMEM);
+ }
+ memset(rdev, 0, sizeof(*rdev));
+
+ if ((err = alloc_disk_sb(rdev)))
+ goto abort_free;
+
+ err = lock_rdev(rdev, newdev);
+ if (err)
+ goto abort_free;
+
+ rdev->desc_nr = -1;
+ rdev->faulty = 0;
+ rdev->in_sync = 0;
+ rdev->data_offset = 0;
+ atomic_set(&rdev->nr_pending, 0);
+
+ size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
+ if (!size) {
+ printk(KERN_WARNING
+ "md: %s has zero or unknown size, marking faulty!\n",
+ bdevname(rdev->bdev,b));
+ err = -EINVAL;
+ goto abort_free;
+ }
+
+ if (super_format >= 0) {
+ err = super_types[super_format].
+ load_super(rdev, NULL, super_minor);
+ if (err == -EINVAL) {
+ printk(KERN_WARNING
+ "md: %s has invalid sb, not importing!\n",
+ bdevname(rdev->bdev,b));
+ goto abort_free;
+ }
+ if (err < 0) {
+ printk(KERN_WARNING
+ "md: could not read %s's sb, not importing!\n",
+ bdevname(rdev->bdev,b));
+ goto abort_free;
+ }
+ }
+ INIT_LIST_HEAD(&rdev->same_set);
+
+ return rdev;
+
+abort_free:
+ if (rdev->sb_page) {
+ if (rdev->bdev)
+ unlock_rdev(rdev);
+ free_disk_sb(rdev);
+ }
+ kfree(rdev);
+ return ERR_PTR(err);
+}
+
+/*
+ * Check a full RAID array for plausibility
+ */
+
+
+static int analyze_sbs(mddev_t * mddev)
+{
+ int i;
+ struct list_head *tmp;
+ mdk_rdev_t *rdev, *freshest;
+ char b[BDEVNAME_SIZE];
+
+ freshest = NULL;
+ ITERATE_RDEV(mddev,rdev,tmp)
+ switch (super_types[mddev->major_version].
+ load_super(rdev, freshest, mddev->minor_version)) {
+ case 1:
+ freshest = rdev;
+ break;
+ case 0:
+ break;
+ default:
+ printk( KERN_ERR \
+ "md: fatal superblock inconsistency in %s"
+ " -- removing from array\n",
+ bdevname(rdev->bdev,b));
+ kick_rdev_from_array(rdev);
+ }
+
+
+ super_types[mddev->major_version].
+ validate_super(mddev, freshest);
+
+ i = 0;
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev != freshest)
+ if (super_types[mddev->major_version].
+ validate_super(mddev, rdev)) {
+ printk(KERN_WARNING "md: kicking non-fresh %s"
+ " from array!\n",
+ bdevname(rdev->bdev,b));
+ kick_rdev_from_array(rdev);
+ continue;
+ }
+ if (mddev->level == LEVEL_MULTIPATH) {
+ rdev->desc_nr = i++;
+ rdev->raid_disk = rdev->desc_nr;
+ rdev->in_sync = 1;
+ }
+ }
+
+
+
+ if (mddev->recovery_cp != MaxSector &&
+ mddev->level >= 1)
+ printk(KERN_ERR "md: %s: raid array is not clean"
+ " -- starting background reconstruction\n",
+ mdname(mddev));
+
+ return 0;
+}
+
+int mdp_major = 0;
+
+static struct kobject *md_probe(dev_t dev, int *part, void *data)
+{
+ static DECLARE_MUTEX(disks_sem);
+ mddev_t *mddev = mddev_find(dev);
+ struct gendisk *disk;
+ int partitioned = (MAJOR(dev) != MD_MAJOR);
+ int shift = partitioned ? MdpMinorShift : 0;
+ int unit = MINOR(dev) >> shift;
+
+ if (!mddev)
+ return NULL;
+
+ down(&disks_sem);
+ if (mddev->gendisk) {
+ up(&disks_sem);
+ mddev_put(mddev);
+ return NULL;
+ }
+ disk = alloc_disk(1 << shift);
+ if (!disk) {
+ up(&disks_sem);
+ mddev_put(mddev);
+ return NULL;
+ }
+ disk->major = MAJOR(dev);
+ disk->first_minor = unit << shift;
+ if (partitioned) {
+ sprintf(disk->disk_name, "md_d%d", unit);
+ sprintf(disk->devfs_name, "md/d%d", unit);
+ } else {
+ sprintf(disk->disk_name, "md%d", unit);
+ sprintf(disk->devfs_name, "md/%d", unit);
+ }
+ disk->fops = &md_fops;
+ disk->private_data = mddev;
+ disk->queue = mddev->queue;
+ add_disk(disk);
+ mddev->gendisk = disk;
+ up(&disks_sem);
+ return NULL;
+}
+
+void md_wakeup_thread(mdk_thread_t *thread);
+
+static void md_safemode_timeout(unsigned long data)
+{
+ mddev_t *mddev = (mddev_t *) data;
+
+ mddev->safemode = 1;
+ md_wakeup_thread(mddev->thread);
+}
+
+
+static int do_md_run(mddev_t * mddev)
+{
+ int pnum, err;
+ int chunk_size;
+ struct list_head *tmp;
+ mdk_rdev_t *rdev;
+ struct gendisk *disk;
+ char b[BDEVNAME_SIZE];
+
+ if (list_empty(&mddev->disks)) {
+ MD_BUG();
+ return -EINVAL;
+ }
+
+ if (mddev->pers)
+ return -EBUSY;
+
+ /*
+ * Analyze all RAID superblock(s)
+ */
+ if (!mddev->raid_disks && analyze_sbs(mddev)) {
+ MD_BUG();
+ return -EINVAL;
+ }
+
+ chunk_size = mddev->chunk_size;
+ pnum = level_to_pers(mddev->level);
+
+ if ((pnum != MULTIPATH) && (pnum != RAID1)) {
+ if (!chunk_size) {
+ /*
+ * 'default chunksize' in the old md code used to
+ * be PAGE_SIZE, baaad.
+ * we abort here to be on the safe side. We don't
+ * want to continue the bad practice.
+ */
+ printk(KERN_ERR
+ "no chunksize specified, see 'man raidtab'\n");
+ return -EINVAL;
+ }
+ if (chunk_size > MAX_CHUNK_SIZE) {
+ printk(KERN_ERR "too big chunk_size: %d > %d\n",
+ chunk_size, MAX_CHUNK_SIZE);
+ return -EINVAL;
+ }
+ /*
+ * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
+ */
+ if ( (1 << ffz(~chunk_size)) != chunk_size) {
+ MD_BUG();
+ return -EINVAL;
+ }
+ if (chunk_size < PAGE_SIZE) {
+ printk(KERN_ERR "too small chunk_size: %d < %ld\n",
+ chunk_size, PAGE_SIZE);
+ return -EINVAL;
+ }
+
+ /* devices must have minimum size of one chunk */
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->faulty)
+ continue;
+ if (rdev->size < chunk_size / 1024) {
+ printk(KERN_WARNING
+ "md: Dev %s smaller than chunk_size:"
+ " %lluk < %dk\n",
+ bdevname(rdev->bdev,b),
+ (unsigned long long)rdev->size,
+ chunk_size / 1024);
+ return -EINVAL;
+ }
+ }
+ }
+
+ if (pnum >= MAX_PERSONALITY) {
+ MD_BUG();
+ return -EINVAL;
+ }
+
+#ifdef CONFIG_KMOD
+ if (!pers[pnum])
+ {
+ request_module("md-personality-%d", pnum);
+ }
+#endif
+
+ /*
+ * Drop all container device buffers, from now on
+ * the only valid external interface is through the md
+ * device.
+ * Also find largest hardsector size
+ */
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->faulty)
+ continue;
+ sync_blockdev(rdev->bdev);
+ invalidate_bdev(rdev->bdev, 0);
+ }
+
+ md_probe(mddev->unit, NULL, NULL);
+ disk = mddev->gendisk;
+ if (!disk)
+ return -ENOMEM;
+
+ spin_lock(&pers_lock);
+ if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) {
+ spin_unlock(&pers_lock);
+ printk(KERN_WARNING "md: personality %d is not loaded!\n",
+ pnum);
+ return -EINVAL;
+ }
+
+ mddev->pers = pers[pnum];
+ spin_unlock(&pers_lock);
+
+ mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
+
+ err = mddev->pers->run(mddev);
+ if (err) {
+ printk(KERN_ERR "md: pers->run() failed ...\n");
+ module_put(mddev->pers->owner);
+ mddev->pers = NULL;
+ return -EINVAL;
+ }
+ atomic_set(&mddev->writes_pending,0);
+ mddev->safemode = 0;
+ mddev->safemode_timer.function = md_safemode_timeout;
+ mddev->safemode_timer.data = (unsigned long) mddev;
+ mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
+ mddev->in_sync = 1;
+
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+
+ if (mddev->sb_dirty)
+ md_update_sb(mddev);
+
+ set_capacity(disk, mddev->array_size<<1);
+
+ /* If we call blk_queue_make_request here, it will
+ * re-initialise max_sectors etc which may have been
+ * refined inside -> run. So just set the bits we need to set.
+ * Most initialisation happended when we called
+ * blk_queue_make_request(..., md_fail_request)
+ * earlier.
+ */
+ mddev->queue->queuedata = mddev;
+ mddev->queue->make_request_fn = mddev->pers->make_request;
+
+ mddev->changed = 1;
+ return 0;
+}
+
+static int restart_array(mddev_t *mddev)
+{
+ struct gendisk *disk = mddev->gendisk;
+ int err;
+
+ /*
+ * Complain if it has no devices
+ */
+ err = -ENXIO;
+ if (list_empty(&mddev->disks))
+ goto out;
+
+ if (mddev->pers) {
+ err = -EBUSY;
+ if (!mddev->ro)
+ goto out;
+
+ mddev->safemode = 0;
+ mddev->ro = 0;
+ set_disk_ro(disk, 0);
+
+ printk(KERN_INFO "md: %s switched to read-write mode.\n",
+ mdname(mddev));
+ /*
+ * Kick recovery or resync if necessary
+ */
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ md_wakeup_thread(mddev->thread);
+ err = 0;
+ } else {
+ printk(KERN_ERR "md: %s has no personality assigned.\n",
+ mdname(mddev));
+ err = -EINVAL;
+ }
+
+out:
+ return err;
+}
+
+static int do_md_stop(mddev_t * mddev, int ro)
+{
+ int err = 0;
+ struct gendisk *disk = mddev->gendisk;
+
+ if (mddev->pers) {
+ if (atomic_read(&mddev->active)>2) {
+ printk("md: %s still in use.\n",mdname(mddev));
+ return -EBUSY;
+ }
+
+ if (mddev->sync_thread) {
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+ md_unregister_thread(mddev->sync_thread);
+ mddev->sync_thread = NULL;
+ }
+
+ del_timer_sync(&mddev->safemode_timer);
+
+ invalidate_partition(disk, 0);
+
+ if (ro) {
+ err = -ENXIO;
+ if (mddev->ro)
+ goto out;
+ mddev->ro = 1;
+ } else {
+ if (mddev->ro)
+ set_disk_ro(disk, 0);
+ blk_queue_make_request(mddev->queue, md_fail_request);
+ mddev->pers->stop(mddev);
+ module_put(mddev->pers->owner);
+ mddev->pers = NULL;
+ if (mddev->ro)
+ mddev->ro = 0;
+ }
+ if (!mddev->in_sync) {
+ /* mark array as shutdown cleanly */
+ mddev->in_sync = 1;
+ md_update_sb(mddev);
+ }
+ if (ro)
+ set_disk_ro(disk, 1);
+ }
+ /*
+ * Free resources if final stop
+ */
+ if (!ro) {
+ struct gendisk *disk;
+ printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
+
+ export_array(mddev);
+
+ mddev->array_size = 0;
+ disk = mddev->gendisk;
+ if (disk)
+ set_capacity(disk, 0);
+ mddev->changed = 1;
+ } else
+ printk(KERN_INFO "md: %s switched to read-only mode.\n",
+ mdname(mddev));
+ err = 0;
+out:
+ return err;
+}
+
+static void autorun_array(mddev_t *mddev)
+{
+ mdk_rdev_t *rdev;
+ struct list_head *tmp;
+ int err;
+
+ if (list_empty(&mddev->disks)) {
+ MD_BUG();
+ return;
+ }
+
+ printk(KERN_INFO "md: running: ");
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ char b[BDEVNAME_SIZE];
+ printk("<%s>", bdevname(rdev->bdev,b));
+ }
+ printk("\n");
+
+ err = do_md_run (mddev);
+ if (err) {
+ printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
+ do_md_stop (mddev, 0);
+ }
+}
+
+/*
+ * lets try to run arrays based on all disks that have arrived
+ * until now. (those are in pending_raid_disks)
+ *
+ * the method: pick the first pending disk, collect all disks with
+ * the same UUID, remove all from the pending list and put them into
+ * the 'same_array' list. Then order this list based on superblock
+ * update time (freshest comes first), kick out 'old' disks and
+ * compare superblocks. If everything's fine then run it.
+ *
+ * If "unit" is allocated, then bump its reference count
+ */
+static void autorun_devices(int part)
+{
+ struct list_head candidates;
+ struct list_head *tmp;
+ mdk_rdev_t *rdev0, *rdev;
+ mddev_t *mddev;
+ char b[BDEVNAME_SIZE];
+
+ printk(KERN_INFO "md: autorun ...\n");
+ while (!list_empty(&pending_raid_disks)) {
+ dev_t dev;
+ rdev0 = list_entry(pending_raid_disks.next,
+ mdk_rdev_t, same_set);
+
+ printk(KERN_INFO "md: considering %s ...\n",
+ bdevname(rdev0->bdev,b));
+ INIT_LIST_HEAD(&candidates);
+ ITERATE_RDEV_PENDING(rdev,tmp)
+ if (super_90_load(rdev, rdev0, 0) >= 0) {
+ printk(KERN_INFO "md: adding %s ...\n",
+ bdevname(rdev->bdev,b));
+ list_move(&rdev->same_set, &candidates);
+ }
+ /*
+ * now we have a set of devices, with all of them having
+ * mostly sane superblocks. It's time to allocate the
+ * mddev.
+ */
+ if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
+ printk(KERN_INFO "md: unit number in %s is bad: %d\n",
+ bdevname(rdev0->bdev, b), rdev0->preferred_minor);
+ break;
+ }
+ if (part)
+ dev = MKDEV(mdp_major,
+ rdev0->preferred_minor << MdpMinorShift);
+ else
+ dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
+
+ md_probe(dev, NULL, NULL);
+ mddev = mddev_find(dev);
+ if (!mddev) {
+ printk(KERN_ERR
+ "md: cannot allocate memory for md drive.\n");
+ break;
+ }
+ if (mddev_lock(mddev))
+ printk(KERN_WARNING "md: %s locked, cannot run\n",
+ mdname(mddev));
+ else if (mddev->raid_disks || mddev->major_version
+ || !list_empty(&mddev->disks)) {
+ printk(KERN_WARNING
+ "md: %s already running, cannot run %s\n",
+ mdname(mddev), bdevname(rdev0->bdev,b));
+ mddev_unlock(mddev);
+ } else {
+ printk(KERN_INFO "md: created %s\n", mdname(mddev));
+ ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
+ list_del_init(&rdev->same_set);
+ if (bind_rdev_to_array(rdev, mddev))
+ export_rdev(rdev);
+ }
+ autorun_array(mddev);
+ mddev_unlock(mddev);
+ }
+ /* on success, candidates will be empty, on error
+ * it won't...
+ */
+ ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
+ export_rdev(rdev);
+ mddev_put(mddev);
+ }
+ printk(KERN_INFO "md: ... autorun DONE.\n");
+}
+
+/*
+ * import RAID devices based on one partition
+ * if possible, the array gets run as well.
+ */
+
+static int autostart_array(dev_t startdev)
+{
+ char b[BDEVNAME_SIZE];
+ int err = -EINVAL, i;
+ mdp_super_t *sb = NULL;
+ mdk_rdev_t *start_rdev = NULL, *rdev;
+
+ start_rdev = md_import_device(startdev, 0, 0);
+ if (IS_ERR(start_rdev))
+ return err;
+
+
+ /* NOTE: this can only work for 0.90.0 superblocks */
+ sb = (mdp_super_t*)page_address(start_rdev->sb_page);
+ if (sb->major_version != 0 ||
+ sb->minor_version != 90 ) {
+ printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
+ export_rdev(start_rdev);
+ return err;
+ }
+
+ if (start_rdev->faulty) {
+ printk(KERN_WARNING
+ "md: can not autostart based on faulty %s!\n",
+ bdevname(start_rdev->bdev,b));
+ export_rdev(start_rdev);
+ return err;
+ }
+ list_add(&start_rdev->same_set, &pending_raid_disks);
+
+ for (i = 0; i < MD_SB_DISKS; i++) {
+ mdp_disk_t *desc = sb->disks + i;
+ dev_t dev = MKDEV(desc->major, desc->minor);
+
+ if (!dev)
+ continue;
+ if (dev == startdev)
+ continue;
+ if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
+ continue;
+ rdev = md_import_device(dev, 0, 0);
+ if (IS_ERR(rdev))
+ continue;
+
+ list_add(&rdev->same_set, &pending_raid_disks);
+ }
+
+ /*
+ * possibly return codes
+ */
+ autorun_devices(0);
+ return 0;
+
+}
+
+
+static int get_version(void __user * arg)
+{
+ mdu_version_t ver;
+
+ ver.major = MD_MAJOR_VERSION;
+ ver.minor = MD_MINOR_VERSION;
+ ver.patchlevel = MD_PATCHLEVEL_VERSION;
+
+ if (copy_to_user(arg, &ver, sizeof(ver)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int get_array_info(mddev_t * mddev, void __user * arg)
+{
+ mdu_array_info_t info;
+ int nr,working,active,failed,spare;
+ mdk_rdev_t *rdev;
+ struct list_head *tmp;
+
+ nr=working=active=failed=spare=0;
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ nr++;
+ if (rdev->faulty)
+ failed++;
+ else {
+ working++;
+ if (rdev->in_sync)
+ active++;
+ else
+ spare++;
+ }
+ }
+
+ info.major_version = mddev->major_version;
+ info.minor_version = mddev->minor_version;
+ info.patch_version = MD_PATCHLEVEL_VERSION;
+ info.ctime = mddev->ctime;
+ info.level = mddev->level;
+ info.size = mddev->size;
+ info.nr_disks = nr;
+ info.raid_disks = mddev->raid_disks;
+ info.md_minor = mddev->md_minor;
+ info.not_persistent= !mddev->persistent;
+
+ info.utime = mddev->utime;
+ info.state = 0;
+ if (mddev->in_sync)
+ info.state = (1<<MD_SB_CLEAN);
+ info.active_disks = active;
+ info.working_disks = working;
+ info.failed_disks = failed;
+ info.spare_disks = spare;
+
+ info.layout = mddev->layout;
+ info.chunk_size = mddev->chunk_size;
+
+ if (copy_to_user(arg, &info, sizeof(info)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int get_disk_info(mddev_t * mddev, void __user * arg)
+{
+ mdu_disk_info_t info;
+ unsigned int nr;
+ mdk_rdev_t *rdev;
+
+ if (copy_from_user(&info, arg, sizeof(info)))
+ return -EFAULT;
+
+ nr = info.number;
+
+ rdev = find_rdev_nr(mddev, nr);
+ if (rdev) {
+ info.major = MAJOR(rdev->bdev->bd_dev);
+ info.minor = MINOR(rdev->bdev->bd_dev);
+ info.raid_disk = rdev->raid_disk;
+ info.state = 0;
+ if (rdev->faulty)
+ info.state |= (1<<MD_DISK_FAULTY);
+ else if (rdev->in_sync) {
+ info.state |= (1<<MD_DISK_ACTIVE);
+ info.state |= (1<<MD_DISK_SYNC);
+ }
+ } else {
+ info.major = info.minor = 0;
+ info.raid_disk = -1;
+ info.state = (1<<MD_DISK_REMOVED);
+ }
+
+ if (copy_to_user(arg, &info, sizeof(info)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
+{
+ char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+ mdk_rdev_t *rdev;
+ dev_t dev = MKDEV(info->major,info->minor);
+
+ if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
+ return -EOVERFLOW;
+
+ if (!mddev->raid_disks) {
+ int err;
+ /* expecting a device which has a superblock */
+ rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
+ if (IS_ERR(rdev)) {
+ printk(KERN_WARNING
+ "md: md_import_device returned %ld\n",
+ PTR_ERR(rdev));
+ return PTR_ERR(rdev);
+ }
+ if (!list_empty(&mddev->disks)) {
+ mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
+ mdk_rdev_t, same_set);
+ int err = super_types[mddev->major_version]
+ .load_super(rdev, rdev0, mddev->minor_version);
+ if (err < 0) {
+ printk(KERN_WARNING
+ "md: %s has different UUID to %s\n",
+ bdevname(rdev->bdev,b),
+ bdevname(rdev0->bdev,b2));
+ export_rdev(rdev);
+ return -EINVAL;
+ }
+ }
+ err = bind_rdev_to_array(rdev, mddev);
+ if (err)
+ export_rdev(rdev);
+ return err;
+ }
+
+ /*
+ * add_new_disk can be used once the array is assembled
+ * to add "hot spares". They must already have a superblock
+ * written
+ */
+ if (mddev->pers) {
+ int err;
+ if (!mddev->pers->hot_add_disk) {
+ printk(KERN_WARNING
+ "%s: personality does not support diskops!\n",
+ mdname(mddev));
+ return -EINVAL;
+ }
+ rdev = md_import_device(dev, mddev->major_version,
+ mddev->minor_version);
+ if (IS_ERR(rdev)) {
+ printk(KERN_WARNING
+ "md: md_import_device returned %ld\n",
+ PTR_ERR(rdev));
+ return PTR_ERR(rdev);
+ }
+ rdev->in_sync = 0; /* just to be sure */
+ rdev->raid_disk = -1;
+ err = bind_rdev_to_array(rdev, mddev);
+ if (err)
+ export_rdev(rdev);
+ if (mddev->thread)
+ md_wakeup_thread(mddev->thread);
+ return err;
+ }
+
+ /* otherwise, add_new_disk is only allowed
+ * for major_version==0 superblocks
+ */
+ if (mddev->major_version != 0) {
+ printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
+ mdname(mddev));
+ return -EINVAL;
+ }
+
+ if (!(info->state & (1<<MD_DISK_FAULTY))) {
+ int err;
+ rdev = md_import_device (dev, -1, 0);
+ if (IS_ERR(rdev)) {
+ printk(KERN_WARNING
+ "md: error, md_import_device() returned %ld\n",
+ PTR_ERR(rdev));
+ return PTR_ERR(rdev);
+ }
+ rdev->desc_nr = info->number;
+ if (info->raid_disk < mddev->raid_disks)
+ rdev->raid_disk = info->raid_disk;
+ else
+ rdev->raid_disk = -1;
+
+ rdev->faulty = 0;
+ if (rdev->raid_disk < mddev->raid_disks)
+ rdev->in_sync = (info->state & (1<<MD_DISK_SYNC));
+ else
+ rdev->in_sync = 0;
+
+ err = bind_rdev_to_array(rdev, mddev);
+ if (err) {
+ export_rdev(rdev);
+ return err;
+ }
+
+ if (!mddev->persistent) {
+ printk(KERN_INFO "md: nonpersistent superblock ...\n");
+ rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
+ } else
+ rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
+ rdev->size = calc_dev_size(rdev, mddev->chunk_size);
+
+ if (!mddev->size || (mddev->size > rdev->size))
+ mddev->size = rdev->size;
+ }
+
+ return 0;
+}
+
+static int hot_remove_disk(mddev_t * mddev, dev_t dev)
+{
+ char b[BDEVNAME_SIZE];
+ mdk_rdev_t *rdev;
+
+ if (!mddev->pers)
+ return -ENODEV;
+
+ rdev = find_rdev(mddev, dev);
+ if (!rdev)
+ return -ENXIO;
+
+ if (rdev->raid_disk >= 0)
+ goto busy;
+
+ kick_rdev_from_array(rdev);
+ md_update_sb(mddev);
+
+ return 0;
+busy:
+ printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
+ bdevname(rdev->bdev,b), mdname(mddev));
+ return -EBUSY;
+}
+
+static int hot_add_disk(mddev_t * mddev, dev_t dev)
+{
+ char b[BDEVNAME_SIZE];
+ int err;
+ unsigned int size;
+ mdk_rdev_t *rdev;
+
+ if (!mddev->pers)
+ return -ENODEV;
+
+ if (mddev->major_version != 0) {
+ printk(KERN_WARNING "%s: HOT_ADD may only be used with"
+ " version-0 superblocks.\n",
+ mdname(mddev));
+ return -EINVAL;
+ }
+ if (!mddev->pers->hot_add_disk) {
+ printk(KERN_WARNING
+ "%s: personality does not support diskops!\n",
+ mdname(mddev));
+ return -EINVAL;
+ }
+
+ rdev = md_import_device (dev, -1, 0);
+ if (IS_ERR(rdev)) {
+ printk(KERN_WARNING
+ "md: error, md_import_device() returned %ld\n",
+ PTR_ERR(rdev));
+ return -EINVAL;
+ }
+
+ if (mddev->persistent)
+ rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
+ else
+ rdev->sb_offset =
+ rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
+
+ size = calc_dev_size(rdev, mddev->chunk_size);
+ rdev->size = size;
+
+ if (size < mddev->size) {
+ printk(KERN_WARNING
+ "%s: disk size %llu blocks < array size %llu\n",
+ mdname(mddev), (unsigned long long)size,
+ (unsigned long long)mddev->size);
+ err = -ENOSPC;
+ goto abort_export;
+ }
+
+ if (rdev->faulty) {
+ printk(KERN_WARNING
+ "md: can not hot-add faulty %s disk to %s!\n",
+ bdevname(rdev->bdev,b), mdname(mddev));
+ err = -EINVAL;
+ goto abort_export;
+ }
+ rdev->in_sync = 0;
+ rdev->desc_nr = -1;
+ bind_rdev_to_array(rdev, mddev);
+
+ /*
+ * The rest should better be atomic, we can have disk failures
+ * noticed in interrupt contexts ...
+ */
+
+ if (rdev->desc_nr == mddev->max_disks) {
+ printk(KERN_WARNING "%s: can not hot-add to full array!\n",
+ mdname(mddev));
+ err = -EBUSY;
+ goto abort_unbind_export;
+ }
+
+ rdev->raid_disk = -1;
+
+ md_update_sb(mddev);
+
+ /*
+ * Kick recovery, maybe this spare has to be added to the
+ * array immediately.
+ */
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ md_wakeup_thread(mddev->thread);
+
+ return 0;
+
+abort_unbind_export:
+ unbind_rdev_from_array(rdev);
+
+abort_export:
+ export_rdev(rdev);
+ return err;
+}
+
+/*
+ * set_array_info is used two different ways
+ * The original usage is when creating a new array.
+ * In this usage, raid_disks is > 0 and it together with
+ * level, size, not_persistent,layout,chunksize determine the
+ * shape of the array.
+ * This will always create an array with a type-0.90.0 superblock.
+ * The newer usage is when assembling an array.
+ * In this case raid_disks will be 0, and the major_version field is
+ * use to determine which style super-blocks are to be found on the devices.
+ * The minor and patch _version numbers are also kept incase the
+ * super_block handler wishes to interpret them.
+ */
+static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
+{
+
+ if (info->raid_disks == 0) {
+ /* just setting version number for superblock loading */
+ if (info->major_version < 0 ||
+ info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
+ super_types[info->major_version].name == NULL) {
+ /* maybe try to auto-load a module? */
+ printk(KERN_INFO
+ "md: superblock version %d not known\n",
+ info->major_version);
+ return -EINVAL;
+ }
+ mddev->major_version = info->major_version;
+ mddev->minor_version = info->minor_version;
+ mddev->patch_version = info->patch_version;
+ return 0;
+ }
+ mddev->major_version = MD_MAJOR_VERSION;
+ mddev->minor_version = MD_MINOR_VERSION;
+ mddev->patch_version = MD_PATCHLEVEL_VERSION;
+ mddev->ctime = get_seconds();
+
+ mddev->level = info->level;
+ mddev->size = info->size;
+ mddev->raid_disks = info->raid_disks;
+ /* don't set md_minor, it is determined by which /dev/md* was
+ * openned
+ */
+ if (info->state & (1<<MD_SB_CLEAN))
+ mddev->recovery_cp = MaxSector;
+ else
+ mddev->recovery_cp = 0;
+ mddev->persistent = ! info->not_persistent;
+
+ mddev->layout = info->layout;
+ mddev->chunk_size = info->chunk_size;
+
+ mddev->max_disks = MD_SB_DISKS;
+
+ mddev->sb_dirty = 1;
+
+ /*
+ * Generate a 128 bit UUID
+ */
+ get_random_bytes(mddev->uuid, 16);
+
+ return 0;
+}
+
+/*
+ * update_array_info is used to change the configuration of an
+ * on-line array.
+ * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
+ * fields in the info are checked against the array.
+ * Any differences that cannot be handled will cause an error.
+ * Normally, only one change can be managed at a time.
+ */
+static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
+{
+ int rv = 0;
+ int cnt = 0;
+
+ if (mddev->major_version != info->major_version ||
+ mddev->minor_version != info->minor_version ||
+/* mddev->patch_version != info->patch_version || */
+ mddev->ctime != info->ctime ||
+ mddev->level != info->level ||
+/* mddev->layout != info->layout || */
+ !mddev->persistent != info->not_persistent||
+ mddev->chunk_size != info->chunk_size )
+ return -EINVAL;
+ /* Check there is only one change */
+ if (mddev->size != info->size) cnt++;
+ if (mddev->raid_disks != info->raid_disks) cnt++;
+ if (mddev->layout != info->layout) cnt++;
+ if (cnt == 0) return 0;
+ if (cnt > 1) return -EINVAL;
+
+ if (mddev->layout != info->layout) {
+ /* Change layout
+ * we don't need to do anything at the md level, the
+ * personality will take care of it all.
+ */
+ if (mddev->pers->reconfig == NULL)
+ return -EINVAL;
+ else
+ return mddev->pers->reconfig(mddev, info->layout, -1);
+ }
+ if (mddev->size != info->size) {
+ mdk_rdev_t * rdev;
+ struct list_head *tmp;
+ if (mddev->pers->resize == NULL)
+ return -EINVAL;
+ /* The "size" is the amount of each device that is used.
+ * This can only make sense for arrays with redundancy.
+ * linear and raid0 always use whatever space is available
+ * We can only consider changing the size if no resync
+ * or reconstruction is happening, and if the new size
+ * is acceptable. It must fit before the sb_offset or,
+ * if that is <data_offset, it must fit before the
+ * size of each device.
+ * If size is zero, we find the largest size that fits.
+ */
+ if (mddev->sync_thread)
+ return -EBUSY;
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ sector_t avail;
+ int fit = (info->size == 0);
+ if (rdev->sb_offset > rdev->data_offset)
+ avail = (rdev->sb_offset*2) - rdev->data_offset;
+ else
+ avail = get_capacity(rdev->bdev->bd_disk)
+ - rdev->data_offset;
+ if (fit && (info->size == 0 || info->size > avail/2))
+ info->size = avail/2;
+ if (avail < ((sector_t)info->size << 1))
+ return -ENOSPC;
+ }
+ rv = mddev->pers->resize(mddev, (sector_t)info->size *2);
+ if (!rv) {
+ struct block_device *bdev;
+
+ bdev = bdget_disk(mddev->gendisk, 0);
+ if (bdev) {
+ down(&bdev->bd_inode->i_sem);
+ i_size_write(bdev->bd_inode, mddev->array_size << 10);
+ up(&bdev->bd_inode->i_sem);
+ bdput(bdev);
+ }
+ }
+ }
+ if (mddev->raid_disks != info->raid_disks) {
+ /* change the number of raid disks */
+ if (mddev->pers->reshape == NULL)
+ return -EINVAL;
+ if (info->raid_disks <= 0 ||
+ info->raid_disks >= mddev->max_disks)
+ return -EINVAL;
+ if (mddev->sync_thread)
+ return -EBUSY;
+ rv = mddev->pers->reshape(mddev, info->raid_disks);
+ if (!rv) {
+ struct block_device *bdev;
+
+ bdev = bdget_disk(mddev->gendisk, 0);
+ if (bdev) {
+ down(&bdev->bd_inode->i_sem);
+ i_size_write(bdev->bd_inode, mddev->array_size << 10);
+ up(&bdev->bd_inode->i_sem);
+ bdput(bdev);
+ }
+ }
+ }
+ md_update_sb(mddev);
+ return rv;
+}
+
+static int set_disk_faulty(mddev_t *mddev, dev_t dev)
+{
+ mdk_rdev_t *rdev;
+
+ if (mddev->pers == NULL)
+ return -ENODEV;
+
+ rdev = find_rdev(mddev, dev);
+ if (!rdev)
+ return -ENODEV;
+
+ md_error(mddev, rdev);
+ return 0;
+}
+
+static int md_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ int err = 0;
+ void __user *argp = (void __user *)arg;
+ struct hd_geometry __user *loc = argp;
+ mddev_t *mddev = NULL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ /*
+ * Commands dealing with the RAID driver but not any
+ * particular array:
+ */
+ switch (cmd)
+ {
+ case RAID_VERSION:
+ err = get_version(argp);
+ goto done;
+
+ case PRINT_RAID_DEBUG:
+ err = 0;
+ md_print_devices();
+ goto done;
+
+#ifndef MODULE
+ case RAID_AUTORUN:
+ err = 0;
+ autostart_arrays(arg);
+ goto done;
+#endif
+ default:;
+ }
+
+ /*
+ * Commands creating/starting a new array:
+ */
+
+ mddev = inode->i_bdev->bd_disk->private_data;
+
+ if (!mddev) {
+ BUG();
+ goto abort;
+ }
+
+
+ if (cmd == START_ARRAY) {
+ /* START_ARRAY doesn't need to lock the array as autostart_array
+ * does the locking, and it could even be a different array
+ */
+ static int cnt = 3;
+ if (cnt > 0 ) {
+ printk(KERN_WARNING
+ "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
+ "This will not be supported beyond 2.6\n",
+ current->comm, current->pid);
+ cnt--;
+ }
+ err = autostart_array(new_decode_dev(arg));
+ if (err) {
+ printk(KERN_WARNING "md: autostart failed!\n");
+ goto abort;
+ }
+ goto done;
+ }
+
+ err = mddev_lock(mddev);
+ if (err) {
+ printk(KERN_INFO
+ "md: ioctl lock interrupted, reason %d, cmd %d\n",
+ err, cmd);
+ goto abort;
+ }
+
+ switch (cmd)
+ {
+ case SET_ARRAY_INFO:
+ {
+ mdu_array_info_t info;
+ if (!arg)
+ memset(&info, 0, sizeof(info));
+ else if (copy_from_user(&info, argp, sizeof(info))) {
+ err = -EFAULT;
+ goto abort_unlock;
+ }
+ if (mddev->pers) {
+ err = update_array_info(mddev, &info);
+ if (err) {
+ printk(KERN_WARNING "md: couldn't update"
+ " array info. %d\n", err);
+ goto abort_unlock;
+ }
+ goto done_unlock;
+ }
+ if (!list_empty(&mddev->disks)) {
+ printk(KERN_WARNING
+ "md: array %s already has disks!\n",
+ mdname(mddev));
+ err = -EBUSY;
+ goto abort_unlock;
+ }
+ if (mddev->raid_disks) {
+ printk(KERN_WARNING
+ "md: array %s already initialised!\n",
+ mdname(mddev));
+ err = -EBUSY;
+ goto abort_unlock;
+ }
+ err = set_array_info(mddev, &info);
+ if (err) {
+ printk(KERN_WARNING "md: couldn't set"
+ " array info. %d\n", err);
+ goto abort_unlock;
+ }
+ }
+ goto done_unlock;
+
+ default:;
+ }
+
+ /*
+ * Commands querying/configuring an existing array:
+ */
+ /* if we are initialised yet, only ADD_NEW_DISK or STOP_ARRAY is allowed */
+ if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY && cmd != RUN_ARRAY) {
+ err = -ENODEV;
+ goto abort_unlock;
+ }
+
+ /*
+ * Commands even a read-only array can execute:
+ */
+ switch (cmd)
+ {
+ case GET_ARRAY_INFO:
+ err = get_array_info(mddev, argp);
+ goto done_unlock;
+
+ case GET_DISK_INFO:
+ err = get_disk_info(mddev, argp);
+ goto done_unlock;
+
+ case RESTART_ARRAY_RW:
+ err = restart_array(mddev);
+ goto done_unlock;
+
+ case STOP_ARRAY:
+ err = do_md_stop (mddev, 0);
+ goto done_unlock;
+
+ case STOP_ARRAY_RO:
+ err = do_md_stop (mddev, 1);
+ goto done_unlock;
+
+ /*
+ * We have a problem here : there is no easy way to give a CHS
+ * virtual geometry. We currently pretend that we have a 2 heads
+ * 4 sectors (with a BIG number of cylinders...). This drives
+ * dosfs just mad... ;-)
+ */
+ case HDIO_GETGEO:
+ if (!loc) {
+ err = -EINVAL;
+ goto abort_unlock;
+ }
+ err = put_user (2, (char __user *) &loc->heads);
+ if (err)
+ goto abort_unlock;
+ err = put_user (4, (char __user *) &loc->sectors);
+ if (err)
+ goto abort_unlock;
+ err = put_user(get_capacity(mddev->gendisk)/8,
+ (short __user *) &loc->cylinders);
+ if (err)
+ goto abort_unlock;
+ err = put_user (get_start_sect(inode->i_bdev),
+ (long __user *) &loc->start);
+ goto done_unlock;
+ }
+
+ /*
+ * The remaining ioctls are changing the state of the
+ * superblock, so we do not allow read-only arrays
+ * here:
+ */
+ if (mddev->ro) {
+ err = -EROFS;
+ goto abort_unlock;
+ }
+
+ switch (cmd)
+ {
+ case ADD_NEW_DISK:
+ {
+ mdu_disk_info_t info;
+ if (copy_from_user(&info, argp, sizeof(info)))
+ err = -EFAULT;
+ else
+ err = add_new_disk(mddev, &info);
+ goto done_unlock;
+ }
+
+ case HOT_REMOVE_DISK:
+ err = hot_remove_disk(mddev, new_decode_dev(arg));
+ goto done_unlock;
+
+ case HOT_ADD_DISK:
+ err = hot_add_disk(mddev, new_decode_dev(arg));
+ goto done_unlock;
+
+ case SET_DISK_FAULTY:
+ err = set_disk_faulty(mddev, new_decode_dev(arg));
+ goto done_unlock;
+
+ case RUN_ARRAY:
+ err = do_md_run (mddev);
+ goto done_unlock;
+
+ default:
+ if (_IOC_TYPE(cmd) == MD_MAJOR)
+ printk(KERN_WARNING "md: %s(pid %d) used"
+ " obsolete MD ioctl, upgrade your"
+ " software to use new ictls.\n",
+ current->comm, current->pid);
+ err = -EINVAL;
+ goto abort_unlock;
+ }
+
+done_unlock:
+abort_unlock:
+ mddev_unlock(mddev);
+
+ return err;
+done:
+ if (err)
+ MD_BUG();
+abort:
+ return err;
+}
+
+static int md_open(struct inode *inode, struct file *file)
+{
+ /*
+ * Succeed if we can lock the mddev, which confirms that
+ * it isn't being stopped right now.
+ */
+ mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
+ int err;
+
+ if ((err = mddev_lock(mddev)))
+ goto out;
+
+ err = 0;
+ mddev_get(mddev);
+ mddev_unlock(mddev);
+
+ check_disk_change(inode->i_bdev);
+ out:
+ return err;
+}
+
+static int md_release(struct inode *inode, struct file * file)
+{
+ mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
+
+ if (!mddev)
+ BUG();
+ mddev_put(mddev);
+
+ return 0;
+}
+
+static int md_media_changed(struct gendisk *disk)
+{
+ mddev_t *mddev = disk->private_data;
+
+ return mddev->changed;
+}
+
+static int md_revalidate(struct gendisk *disk)
+{
+ mddev_t *mddev = disk->private_data;
+
+ mddev->changed = 0;
+ return 0;
+}
+static struct block_device_operations md_fops =
+{
+ .owner = THIS_MODULE,
+ .open = md_open,
+ .release = md_release,
+ .ioctl = md_ioctl,
+ .media_changed = md_media_changed,
+ .revalidate_disk= md_revalidate,
+};
+
+int md_thread(void * arg)
+{
+ mdk_thread_t *thread = arg;
+
+ lock_kernel();
+
+ /*
+ * Detach thread
+ */
+
+ daemonize(thread->name, mdname(thread->mddev));
+
+ current->exit_signal = SIGCHLD;
+ allow_signal(SIGKILL);
+ thread->tsk = current;
+
+ /*
+ * md_thread is a 'system-thread', it's priority should be very
+ * high. We avoid resource deadlocks individually in each
+ * raid personality. (RAID5 does preallocation) We also use RR and
+ * the very same RT priority as kswapd, thus we will never get
+ * into a priority inversion deadlock.
+ *
+ * we definitely have to have equal or higher priority than
+ * bdflush, otherwise bdflush will deadlock if there are too
+ * many dirty RAID5 blocks.
+ */
+ unlock_kernel();
+
+ complete(thread->event);
+ while (thread->run) {
+ void (*run)(mddev_t *);
+
+ wait_event_interruptible(thread->wqueue,
+ test_bit(THREAD_WAKEUP, &thread->flags));
+ if (current->flags & PF_FREEZE)
+ refrigerator(PF_FREEZE);
+
+ clear_bit(THREAD_WAKEUP, &thread->flags);
+
+ run = thread->run;
+ if (run)
+ run(thread->mddev);
+
+ if (signal_pending(current))
+ flush_signals(current);
+ }
+ complete(thread->event);
+ return 0;
+}
+
+void md_wakeup_thread(mdk_thread_t *thread)
+{
+ if (thread) {
+ dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
+ set_bit(THREAD_WAKEUP, &thread->flags);
+ wake_up(&thread->wqueue);
+ }
+}
+
+mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
+ const char *name)
+{
+ mdk_thread_t *thread;
+ int ret;
+ struct completion event;
+
+ thread = (mdk_thread_t *) kmalloc
+ (sizeof(mdk_thread_t), GFP_KERNEL);
+ if (!thread)
+ return NULL;
+
+ memset(thread, 0, sizeof(mdk_thread_t));
+ init_waitqueue_head(&thread->wqueue);
+
+ init_completion(&event);
+ thread->event = &event;
+ thread->run = run;
+ thread->mddev = mddev;
+ thread->name = name;
+ ret = kernel_thread(md_thread, thread, 0);
+ if (ret < 0) {
+ kfree(thread);
+ return NULL;
+ }
+ wait_for_completion(&event);
+ return thread;
+}
+
+static void md_interrupt_thread(mdk_thread_t *thread)
+{
+ if (!thread->tsk) {
+ MD_BUG();
+ return;
+ }
+ dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
+ send_sig(SIGKILL, thread->tsk, 1);
+}
+
+void md_unregister_thread(mdk_thread_t *thread)
+{
+ struct completion event;
+
+ init_completion(&event);
+
+ thread->event = &event;
+ thread->run = NULL;
+ thread->name = NULL;
+ md_interrupt_thread(thread);
+ wait_for_completion(&event);
+ kfree(thread);
+}
+
+void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+ if (!mddev) {
+ MD_BUG();
+ return;
+ }
+
+ if (!rdev || rdev->faulty)
+ return;
+
+ dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
+ mdname(mddev),
+ MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
+ __builtin_return_address(0),__builtin_return_address(1),
+ __builtin_return_address(2),__builtin_return_address(3));
+
+ if (!mddev->pers->error_handler)
+ return;
+ mddev->pers->error_handler(mddev,rdev);
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ md_wakeup_thread(mddev->thread);
+}
+
+/* seq_file implementation /proc/mdstat */
+
+static void status_unused(struct seq_file *seq)
+{
+ int i = 0;
+ mdk_rdev_t *rdev;
+ struct list_head *tmp;
+
+ seq_printf(seq, "unused devices: ");
+
+ ITERATE_RDEV_PENDING(rdev,tmp) {
+ char b[BDEVNAME_SIZE];
+ i++;
+ seq_printf(seq, "%s ",
+ bdevname(rdev->bdev,b));
+ }
+ if (!i)
+ seq_printf(seq, "<none>");
+
+ seq_printf(seq, "\n");
+}
+
+
+static void status_resync(struct seq_file *seq, mddev_t * mddev)
+{
+ unsigned long max_blocks, resync, res, dt, db, rt;
+
+ resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
+
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ max_blocks = mddev->resync_max_sectors >> 1;
+ else
+ max_blocks = mddev->size;
+
+ /*
+ * Should not happen.
+ */
+ if (!max_blocks) {
+ MD_BUG();
+ return;
+ }
+ res = (resync/1024)*1000/(max_blocks/1024 + 1);
+ {
+ int i, x = res/50, y = 20-x;
+ seq_printf(seq, "[");
+ for (i = 0; i < x; i++)
+ seq_printf(seq, "=");
+ seq_printf(seq, ">");
+ for (i = 0; i < y; i++)
+ seq_printf(seq, ".");
+ seq_printf(seq, "] ");
+ }
+ seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
+ (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
+ "resync" : "recovery"),
+ res/10, res % 10, resync, max_blocks);
+
+ /*
+ * We do not want to overflow, so the order of operands and
+ * the * 100 / 100 trick are important. We do a +1 to be
+ * safe against division by zero. We only estimate anyway.
+ *
+ * dt: time from mark until now
+ * db: blocks written from mark until now
+ * rt: remaining time
+ */
+ dt = ((jiffies - mddev->resync_mark) / HZ);
+ if (!dt) dt++;
+ db = resync - (mddev->resync_mark_cnt/2);
+ rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
+
+ seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
+
+ seq_printf(seq, " speed=%ldK/sec", db/dt);
+}
+
+static void *md_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ struct list_head *tmp;
+ loff_t l = *pos;
+ mddev_t *mddev;
+
+ if (l >= 0x10000)
+ return NULL;
+ if (!l--)
+ /* header */
+ return (void*)1;
+
+ spin_lock(&all_mddevs_lock);
+ list_for_each(tmp,&all_mddevs)
+ if (!l--) {
+ mddev = list_entry(tmp, mddev_t, all_mddevs);
+ mddev_get(mddev);
+ spin_unlock(&all_mddevs_lock);
+ return mddev;
+ }
+ spin_unlock(&all_mddevs_lock);
+ if (!l--)
+ return (void*)2;/* tail */
+ return NULL;
+}
+
+static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct list_head *tmp;
+ mddev_t *next_mddev, *mddev = v;
+
+ ++*pos;
+ if (v == (void*)2)
+ return NULL;
+
+ spin_lock(&all_mddevs_lock);
+ if (v == (void*)1)
+ tmp = all_mddevs.next;
+ else
+ tmp = mddev->all_mddevs.next;
+ if (tmp != &all_mddevs)
+ next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
+ else {
+ next_mddev = (void*)2;
+ *pos = 0x10000;
+ }
+ spin_unlock(&all_mddevs_lock);
+
+ if (v != (void*)1)
+ mddev_put(mddev);
+ return next_mddev;
+
+}
+
+static void md_seq_stop(struct seq_file *seq, void *v)
+{
+ mddev_t *mddev = v;
+
+ if (mddev && v != (void*)1 && v != (void*)2)
+ mddev_put(mddev);
+}
+
+static int md_seq_show(struct seq_file *seq, void *v)
+{
+ mddev_t *mddev = v;
+ sector_t size;
+ struct list_head *tmp2;
+ mdk_rdev_t *rdev;
+ int i;
+
+ if (v == (void*)1) {
+ seq_printf(seq, "Personalities : ");
+ spin_lock(&pers_lock);
+ for (i = 0; i < MAX_PERSONALITY; i++)
+ if (pers[i])
+ seq_printf(seq, "[%s] ", pers[i]->name);
+
+ spin_unlock(&pers_lock);
+ seq_printf(seq, "\n");
+ return 0;
+ }
+ if (v == (void*)2) {
+ status_unused(seq);
+ return 0;
+ }
+
+ if (mddev_lock(mddev)!=0)
+ return -EINTR;
+ if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
+ seq_printf(seq, "%s : %sactive", mdname(mddev),
+ mddev->pers ? "" : "in");
+ if (mddev->pers) {
+ if (mddev->ro)
+ seq_printf(seq, " (read-only)");
+ seq_printf(seq, " %s", mddev->pers->name);
+ }
+
+ size = 0;
+ ITERATE_RDEV(mddev,rdev,tmp2) {
+ char b[BDEVNAME_SIZE];
+ seq_printf(seq, " %s[%d]",
+ bdevname(rdev->bdev,b), rdev->desc_nr);
+ if (rdev->faulty) {
+ seq_printf(seq, "(F)");
+ continue;
+ }
+ size += rdev->size;
+ }
+
+ if (!list_empty(&mddev->disks)) {
+ if (mddev->pers)
+ seq_printf(seq, "\n %llu blocks",
+ (unsigned long long)mddev->array_size);
+ else
+ seq_printf(seq, "\n %llu blocks",
+ (unsigned long long)size);
+ }
+
+ if (mddev->pers) {
+ mddev->pers->status (seq, mddev);
+ seq_printf(seq, "\n ");
+ if (mddev->curr_resync > 2)
+ status_resync (seq, mddev);
+ else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
+ seq_printf(seq, " resync=DELAYED");
+ }
+
+ seq_printf(seq, "\n");
+ }
+ mddev_unlock(mddev);
+
+ return 0;
+}
+
+static struct seq_operations md_seq_ops = {
+ .start = md_seq_start,
+ .next = md_seq_next,
+ .stop = md_seq_stop,
+ .show = md_seq_show,
+};
+
+static int md_seq_open(struct inode *inode, struct file *file)
+{
+ int error;
+
+ error = seq_open(file, &md_seq_ops);
+ return error;
+}
+
+static struct file_operations md_seq_fops = {
+ .open = md_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+int register_md_personality(int pnum, mdk_personality_t *p)
+{
+ if (pnum >= MAX_PERSONALITY) {
+ printk(KERN_ERR
+ "md: tried to install personality %s as nr %d, but max is %lu\n",
+ p->name, pnum, MAX_PERSONALITY-1);
+ return -EINVAL;
+ }
+
+ spin_lock(&pers_lock);
+ if (pers[pnum]) {
+ spin_unlock(&pers_lock);
+ MD_BUG();
+ return -EBUSY;
+ }
+
+ pers[pnum] = p;
+ printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum);
+ spin_unlock(&pers_lock);
+ return 0;
+}
+
+int unregister_md_personality(int pnum)
+{
+ if (pnum >= MAX_PERSONALITY) {
+ MD_BUG();
+ return -EINVAL;
+ }
+
+ printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name);
+ spin_lock(&pers_lock);
+ pers[pnum] = NULL;
+ spin_unlock(&pers_lock);
+ return 0;
+}
+
+static int is_mddev_idle(mddev_t *mddev)
+{
+ mdk_rdev_t * rdev;
+ struct list_head *tmp;
+ int idle;
+ unsigned long curr_events;
+
+ idle = 1;
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
+ curr_events = disk_stat_read(disk, read_sectors) +
+ disk_stat_read(disk, write_sectors) -
+ atomic_read(&disk->sync_io);
+ /* Allow some slack between valud of curr_events and last_events,
+ * as there are some uninteresting races.
+ * Note: the following is an unsigned comparison.
+ */
+ if ((curr_events - rdev->last_events + 32) > 64) {
+ rdev->last_events = curr_events;
+ idle = 0;
+ }
+ }
+ return idle;
+}
+
+void md_done_sync(mddev_t *mddev, int blocks, int ok)
+{
+ /* another "blocks" (512byte) blocks have been synced */
+ atomic_sub(blocks, &mddev->recovery_active);
+ wake_up(&mddev->recovery_wait);
+ if (!ok) {
+ set_bit(MD_RECOVERY_ERR, &mddev->recovery);
+ md_wakeup_thread(mddev->thread);
+ // stop recovery, signal do_sync ....
+ }
+}
+
+
+void md_write_start(mddev_t *mddev)
+{
+ if (!atomic_read(&mddev->writes_pending)) {
+ mddev_lock_uninterruptible(mddev);
+ if (mddev->in_sync) {
+ mddev->in_sync = 0;
+ del_timer(&mddev->safemode_timer);
+ md_update_sb(mddev);
+ }
+ atomic_inc(&mddev->writes_pending);
+ mddev_unlock(mddev);
+ } else
+ atomic_inc(&mddev->writes_pending);
+}
+
+void md_write_end(mddev_t *mddev)
+{
+ if (atomic_dec_and_test(&mddev->writes_pending)) {
+ if (mddev->safemode == 2)
+ md_wakeup_thread(mddev->thread);
+ else
+ mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
+ }
+}
+
+static inline void md_enter_safemode(mddev_t *mddev)
+{
+ if (!mddev->safemode) return;
+ if (mddev->safemode == 2 &&
+ (atomic_read(&mddev->writes_pending) || mddev->in_sync ||
+ mddev->recovery_cp != MaxSector))
+ return; /* avoid the lock */
+ mddev_lock_uninterruptible(mddev);
+ if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
+ !mddev->in_sync && mddev->recovery_cp == MaxSector) {
+ mddev->in_sync = 1;
+ md_update_sb(mddev);
+ }
+ mddev_unlock(mddev);
+
+ if (mddev->safemode == 1)
+ mddev->safemode = 0;
+}
+
+void md_handle_safemode(mddev_t *mddev)
+{
+ if (signal_pending(current)) {
+ printk(KERN_INFO "md: %s in immediate safe mode\n",
+ mdname(mddev));
+ mddev->safemode = 2;
+ flush_signals(current);
+ }
+ md_enter_safemode(mddev);
+}
+
+
+DECLARE_WAIT_QUEUE_HEAD(resync_wait);
+
+#define SYNC_MARKS 10
+#define SYNC_MARK_STEP (3*HZ)
+static void md_do_sync(mddev_t *mddev)
+{
+ mddev_t *mddev2;
+ unsigned int currspeed = 0,
+ window;
+ sector_t max_sectors,j;
+ unsigned long mark[SYNC_MARKS];
+ sector_t mark_cnt[SYNC_MARKS];
+ int last_mark,m;
+ struct list_head *tmp;
+ sector_t last_check;
+
+ /* just incase thread restarts... */
+ if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
+ return;
+
+ /* we overload curr_resync somewhat here.
+ * 0 == not engaged in resync at all
+ * 2 == checking that there is no conflict with another sync
+ * 1 == like 2, but have yielded to allow conflicting resync to
+ * commense
+ * other == active in resync - this many blocks
+ *
+ * Before starting a resync we must have set curr_resync to
+ * 2, and then checked that every "conflicting" array has curr_resync
+ * less than ours. When we find one that is the same or higher
+ * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
+ * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
+ * This will mean we have to start checking from the beginning again.
+ *
+ */
+
+ do {
+ mddev->curr_resync = 2;
+
+ try_again:
+ if (signal_pending(current)) {
+ flush_signals(current);
+ goto skip;
+ }
+ ITERATE_MDDEV(mddev2,tmp) {
+ printk(".");
+ if (mddev2 == mddev)
+ continue;
+ if (mddev2->curr_resync &&
+ match_mddev_units(mddev,mddev2)) {
+ DEFINE_WAIT(wq);
+ if (mddev < mddev2 && mddev->curr_resync == 2) {
+ /* arbitrarily yield */
+ mddev->curr_resync = 1;
+ wake_up(&resync_wait);
+ }
+ if (mddev > mddev2 && mddev->curr_resync == 1)
+ /* no need to wait here, we can wait the next
+ * time 'round when curr_resync == 2
+ */
+ continue;
+ prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
+ if (!signal_pending(current)
+ && mddev2->curr_resync >= mddev->curr_resync) {
+ printk(KERN_INFO "md: delaying resync of %s"
+ " until %s has finished resync (they"
+ " share one or more physical units)\n",
+ mdname(mddev), mdname(mddev2));
+ mddev_put(mddev2);
+ schedule();
+ finish_wait(&resync_wait, &wq);
+ goto try_again;
+ }
+ finish_wait(&resync_wait, &wq);
+ }
+ }
+ } while (mddev->curr_resync < 2);
+
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ /* resync follows the size requested by the personality,
+ * which default to physical size, but can be virtual size
+ */
+ max_sectors = mddev->resync_max_sectors;
+ else
+ /* recovery follows the physical size of devices */
+ max_sectors = mddev->size << 1;
+
+ printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
+ printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
+ " %d KB/sec/disc.\n", sysctl_speed_limit_min);
+ printk(KERN_INFO "md: using maximum available idle IO bandwith "
+ "(but not more than %d KB/sec) for reconstruction.\n",
+ sysctl_speed_limit_max);
+
+ is_mddev_idle(mddev); /* this also initializes IO event counters */
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ j = mddev->recovery_cp;
+ else
+ j = 0;
+ for (m = 0; m < SYNC_MARKS; m++) {
+ mark[m] = jiffies;
+ mark_cnt[m] = j;
+ }
+ last_mark = 0;
+ mddev->resync_mark = mark[last_mark];
+ mddev->resync_mark_cnt = mark_cnt[last_mark];
+
+ /*
+ * Tune reconstruction:
+ */
+ window = 32*(PAGE_SIZE/512);
+ printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
+ window/2,(unsigned long long) max_sectors/2);
+
+ atomic_set(&mddev->recovery_active, 0);
+ init_waitqueue_head(&mddev->recovery_wait);
+ last_check = 0;
+
+ if (j>2) {
+ printk(KERN_INFO
+ "md: resuming recovery of %s from checkpoint.\n",
+ mdname(mddev));
+ mddev->curr_resync = j;
+ }
+
+ while (j < max_sectors) {
+ int sectors;
+
+ sectors = mddev->pers->sync_request(mddev, j, currspeed < sysctl_speed_limit_min);
+ if (sectors < 0) {
+ set_bit(MD_RECOVERY_ERR, &mddev->recovery);
+ goto out;
+ }
+ atomic_add(sectors, &mddev->recovery_active);
+ j += sectors;
+ if (j>1) mddev->curr_resync = j;
+
+ if (last_check + window > j || j == max_sectors)
+ continue;
+
+ last_check = j;
+
+ if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
+ test_bit(MD_RECOVERY_ERR, &mddev->recovery))
+ break;
+
+ repeat:
+ if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
+ /* step marks */
+ int next = (last_mark+1) % SYNC_MARKS;
+
+ mddev->resync_mark = mark[next];
+ mddev->resync_mark_cnt = mark_cnt[next];
+ mark[next] = jiffies;
+ mark_cnt[next] = j - atomic_read(&mddev->recovery_active);
+ last_mark = next;
+ }
+
+
+ if (signal_pending(current)) {
+ /*
+ * got a signal, exit.
+ */
+ printk(KERN_INFO
+ "md: md_do_sync() got signal ... exiting\n");
+ flush_signals(current);
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+ goto out;
+ }
+
+ /*
+ * this loop exits only if either when we are slower than
+ * the 'hard' speed limit, or the system was IO-idle for
+ * a jiffy.
+ * the system might be non-idle CPU-wise, but we only care
+ * about not overloading the IO subsystem. (things like an
+ * e2fsck being done on the RAID array should execute fast)
+ */
+ mddev->queue->unplug_fn(mddev->queue);
+ cond_resched();
+
+ currspeed = ((unsigned long)(j-mddev->resync_mark_cnt))/2/((jiffies-mddev->resync_mark)/HZ +1) +1;
+
+ if (currspeed > sysctl_speed_limit_min) {
+ if ((currspeed > sysctl_speed_limit_max) ||
+ !is_mddev_idle(mddev)) {
+ msleep_interruptible(250);
+ goto repeat;
+ }
+ }
+ }
+ printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
+ /*
+ * this also signals 'finished resyncing' to md_stop
+ */
+ out:
+ mddev->queue->unplug_fn(mddev->queue);
+
+ wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
+
+ /* tell personality that we are finished */
+ mddev->pers->sync_request(mddev, max_sectors, 1);
+
+ if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
+ mddev->curr_resync > 2 &&
+ mddev->curr_resync >= mddev->recovery_cp) {
+ if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
+ printk(KERN_INFO
+ "md: checkpointing recovery of %s.\n",
+ mdname(mddev));
+ mddev->recovery_cp = mddev->curr_resync;
+ } else
+ mddev->recovery_cp = MaxSector;
+ }
+
+ md_enter_safemode(mddev);
+ skip:
+ mddev->curr_resync = 0;
+ wake_up(&resync_wait);
+ set_bit(MD_RECOVERY_DONE, &mddev->recovery);
+ md_wakeup_thread(mddev->thread);
+}
+
+
+/*
+ * This routine is regularly called by all per-raid-array threads to
+ * deal with generic issues like resync and super-block update.
+ * Raid personalities that don't have a thread (linear/raid0) do not
+ * need this as they never do any recovery or update the superblock.
+ *
+ * It does not do any resync itself, but rather "forks" off other threads
+ * to do that as needed.
+ * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
+ * "->recovery" and create a thread at ->sync_thread.
+ * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
+ * and wakeups up this thread which will reap the thread and finish up.
+ * This thread also removes any faulty devices (with nr_pending == 0).
+ *
+ * The overall approach is:
+ * 1/ if the superblock needs updating, update it.
+ * 2/ If a recovery thread is running, don't do anything else.
+ * 3/ If recovery has finished, clean up, possibly marking spares active.
+ * 4/ If there are any faulty devices, remove them.
+ * 5/ If array is degraded, try to add spares devices
+ * 6/ If array has spares or is not in-sync, start a resync thread.
+ */
+void md_check_recovery(mddev_t *mddev)
+{
+ mdk_rdev_t *rdev;
+ struct list_head *rtmp;
+
+
+ dprintk(KERN_INFO "md: recovery thread got woken up ...\n");
+
+ if (mddev->ro)
+ return;
+ if ( ! (
+ mddev->sb_dirty ||
+ test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
+ test_bit(MD_RECOVERY_DONE, &mddev->recovery)
+ ))
+ return;
+ if (mddev_trylock(mddev)==0) {
+ int spares =0;
+ if (mddev->sb_dirty)
+ md_update_sb(mddev);
+ if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
+ !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
+ /* resync/recovery still happening */
+ clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ goto unlock;
+ }
+ if (mddev->sync_thread) {
+ /* resync has finished, collect result */
+ md_unregister_thread(mddev->sync_thread);
+ mddev->sync_thread = NULL;
+ if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
+ !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
+ /* success...*/
+ /* activate any spares */
+ mddev->pers->spare_active(mddev);
+ }
+ md_update_sb(mddev);
+ mddev->recovery = 0;
+ /* flag recovery needed just to double check */
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ goto unlock;
+ }
+ if (mddev->recovery)
+ /* probably just the RECOVERY_NEEDED flag */
+ mddev->recovery = 0;
+
+ /* no recovery is running.
+ * remove any failed drives, then
+ * add spares if possible.
+ * Spare are also removed and re-added, to allow
+ * the personality to fail the re-add.
+ */
+ ITERATE_RDEV(mddev,rdev,rtmp)
+ if (rdev->raid_disk >= 0 &&
+ (rdev->faulty || ! rdev->in_sync) &&
+ atomic_read(&rdev->nr_pending)==0) {
+ if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0)
+ rdev->raid_disk = -1;
+ }
+
+ if (mddev->degraded) {
+ ITERATE_RDEV(mddev,rdev,rtmp)
+ if (rdev->raid_disk < 0
+ && !rdev->faulty) {
+ if (mddev->pers->hot_add_disk(mddev,rdev))
+ spares++;
+ else
+ break;
+ }
+ }
+
+ if (!spares && (mddev->recovery_cp == MaxSector )) {
+ /* nothing we can do ... */
+ goto unlock;
+ }
+ if (mddev->pers->sync_request) {
+ set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
+ if (!spares)
+ set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
+ mddev->sync_thread = md_register_thread(md_do_sync,
+ mddev,
+ "%s_resync");
+ if (!mddev->sync_thread) {
+ printk(KERN_ERR "%s: could not start resync"
+ " thread...\n",
+ mdname(mddev));
+ /* leave the spares where they are, it shouldn't hurt */
+ mddev->recovery = 0;
+ } else {
+ md_wakeup_thread(mddev->sync_thread);
+ }
+ }
+ unlock:
+ mddev_unlock(mddev);
+ }
+}
+
+int md_notify_reboot(struct notifier_block *this,
+ unsigned long code, void *x)
+{
+ struct list_head *tmp;
+ mddev_t *mddev;
+
+ if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
+
+ printk(KERN_INFO "md: stopping all md devices.\n");
+
+ ITERATE_MDDEV(mddev,tmp)
+ if (mddev_trylock(mddev)==0)
+ do_md_stop (mddev, 1);
+ /*
+ * certain more exotic SCSI devices are known to be
+ * volatile wrt too early system reboots. While the
+ * right place to handle this issue is the given
+ * driver, we do want to have a safe RAID driver ...
+ */
+ mdelay(1000*1);
+ }
+ return NOTIFY_DONE;
+}
+
+struct notifier_block md_notifier = {
+ .notifier_call = md_notify_reboot,
+ .next = NULL,
+ .priority = INT_MAX, /* before any real devices */
+};
+
+static void md_geninit(void)
+{
+ struct proc_dir_entry *p;
+
+ dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
+
+ p = create_proc_entry("mdstat", S_IRUGO, NULL);
+ if (p)
+ p->proc_fops = &md_seq_fops;
+}
+
+int __init md_init(void)
+{
+ int minor;
+
+ printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
+ " MD_SB_DISKS=%d\n",
+ MD_MAJOR_VERSION, MD_MINOR_VERSION,
+ MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
+
+ if (register_blkdev(MAJOR_NR, "md"))
+ return -1;
+ if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
+ unregister_blkdev(MAJOR_NR, "md");
+ return -1;
+ }
+ devfs_mk_dir("md");
+ blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
+ md_probe, NULL, NULL);
+ blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
+ md_probe, NULL, NULL);
+
+ for (minor=0; minor < MAX_MD_DEVS; ++minor)
+ devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
+ S_IFBLK|S_IRUSR|S_IWUSR,
+ "md/%d", minor);
+
+ for (minor=0; minor < MAX_MD_DEVS; ++minor)
+ devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
+ S_IFBLK|S_IRUSR|S_IWUSR,
+ "md/mdp%d", minor);
+
+
+ register_reboot_notifier(&md_notifier);
+ raid_table_header = register_sysctl_table(raid_root_table, 1);
+
+ md_geninit();
+ return (0);
+}
+
+
+#ifndef MODULE
+
+/*
+ * Searches all registered partitions for autorun RAID arrays
+ * at boot time.
+ */
+static dev_t detected_devices[128];
+static int dev_cnt;
+
+void md_autodetect_dev(dev_t dev)
+{
+ if (dev_cnt >= 0 && dev_cnt < 127)
+ detected_devices[dev_cnt++] = dev;
+}
+
+
+static void autostart_arrays(int part)
+{
+ mdk_rdev_t *rdev;
+ int i;
+
+ printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
+
+ for (i = 0; i < dev_cnt; i++) {
+ dev_t dev = detected_devices[i];
+
+ rdev = md_import_device(dev,0, 0);
+ if (IS_ERR(rdev))
+ continue;
+
+ if (rdev->faulty) {
+ MD_BUG();
+ continue;
+ }
+ list_add(&rdev->same_set, &pending_raid_disks);
+ }
+ dev_cnt = 0;
+
+ autorun_devices(part);
+}
+
+#endif
+
+static __exit void md_exit(void)
+{
+ mddev_t *mddev;
+ struct list_head *tmp;
+ int i;
+ blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
+ blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
+ for (i=0; i < MAX_MD_DEVS; i++)
+ devfs_remove("md/%d", i);
+ for (i=0; i < MAX_MD_DEVS; i++)
+ devfs_remove("md/d%d", i);
+
+ devfs_remove("md");
+
+ unregister_blkdev(MAJOR_NR,"md");
+ unregister_blkdev(mdp_major, "mdp");
+ unregister_reboot_notifier(&md_notifier);
+ unregister_sysctl_table(raid_table_header);
+ remove_proc_entry("mdstat", NULL);
+ ITERATE_MDDEV(mddev,tmp) {
+ struct gendisk *disk = mddev->gendisk;
+ if (!disk)
+ continue;
+ export_array(mddev);
+ del_gendisk(disk);
+ put_disk(disk);
+ mddev->gendisk = NULL;
+ mddev_put(mddev);
+ }
+}
+
+module_init(md_init)
+module_exit(md_exit)
+
+EXPORT_SYMBOL(register_md_personality);
+EXPORT_SYMBOL(unregister_md_personality);
+EXPORT_SYMBOL(md_error);
+EXPORT_SYMBOL(md_done_sync);
+EXPORT_SYMBOL(md_write_start);
+EXPORT_SYMBOL(md_write_end);
+EXPORT_SYMBOL(md_handle_safemode);
+EXPORT_SYMBOL(md_register_thread);
+EXPORT_SYMBOL(md_unregister_thread);
+EXPORT_SYMBOL(md_wakeup_thread);
+EXPORT_SYMBOL(md_print_devices);
+EXPORT_SYMBOL(md_check_recovery);
+MODULE_LICENSE("GPL");