diff options
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 3766 |
1 files changed, 3766 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c new file mode 100644 index 000000000000..04562add1920 --- /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"); |