#include <linux/sched/mm.h>
#include <linux/sched/signal.h>
#include <linux/kthread.h>
#include <linux/blkdev.h>
#include <linux/blk-integrity.h>
#include <linux/badblocks.h>
#include <linux/sysctl.h>
#include <linux/seq_file.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/hdreg.h>
#include <linux/proc_fs.h>
#include <linux/random.h>
#include <linux/major.h>
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/file.h>
#include <linux/compat.h>
#include <linux/delay.h>
#include <linux/raid/md_p.h>
#include <linux/raid/md_u.h>
#include <linux/raid/detect.h>
#include <linux/slab.h>
#include <linux/percpu-refcount.h>
#include <linux/part_stat.h>
#include <trace/events/block.h>
#include "md.h"
#include "md-bitmap.h"
#include "md-cluster.h"
static LIST_HEAD(pers_list);
static DEFINE_SPINLOCK(pers_lock);
static const struct kobj_type md_ktype;
struct md_cluster_operations *md_cluster_ops;
EXPORT_SYMBOL(md_cluster_ops);
static struct module *md_cluster_mod;
static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
static struct workqueue_struct *md_wq;
static struct workqueue_struct *md_misc_wq;
struct workqueue_struct *md_bitmap_wq;
static int remove_and_add_spares(struct mddev *mddev,
struct md_rdev *this);
static void mddev_detach(struct mddev *mddev);
static void export_rdev(struct md_rdev *rdev, struct mddev *mddev);
static void md_wakeup_thread_directly(struct md_thread __rcu *thread);
#define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
#define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
static int sysctl_speed_limit_min = 1000;
static int sysctl_speed_limit_max = 200000;
static inline int speed_min(struct mddev *mddev)
{
return mddev->sync_speed_min ?
mddev->sync_speed_min : sysctl_speed_limit_min;
}
static inline int speed_max(struct mddev *mddev)
{
return mddev->sync_speed_max ?
mddev->sync_speed_max : sysctl_speed_limit_max;
}
static void rdev_uninit_serial(struct md_rdev *rdev)
{
if (!test_and_clear_bit(CollisionCheck, &rdev->flags))
return;
kvfree(rdev->serial);
rdev->serial = NULL;
}
static void rdevs_uninit_serial(struct mddev *mddev)
{
struct md_rdev *rdev;
rdev_for_each(rdev, mddev)
rdev_uninit_serial(rdev);
}
static int rdev_init_serial(struct md_rdev *rdev)
{
int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t))));
struct serial_in_rdev *serial = NULL;
if (test_bit(CollisionCheck, &rdev->flags))
return 0;
serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums,
GFP_KERNEL);
if (!serial)
return -ENOMEM;
for (i = 0; i < serial_nums; i++) {
struct serial_in_rdev *serial_tmp = &serial[i];
spin_lock_init(&serial_tmp->serial_lock);
serial_tmp->serial_rb = RB_ROOT_CACHED;
init_waitqueue_head(&serial_tmp->serial_io_wait);
}
rdev->serial = serial;
set_bit(CollisionCheck, &rdev->flags);
return 0;
}
static int rdevs_init_serial(struct mddev *mddev)
{
struct md_rdev *rdev;
int ret = 0;
rdev_for_each(rdev, mddev) {
ret = rdev_init_serial(rdev);
if (ret)
break;
}
if (ret && !mddev->serial_info_pool)
rdevs_uninit_serial(mddev);
return ret;
}
static int rdev_need_serial(struct md_rdev *rdev)
{
return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 &&
rdev->bdev->bd_disk->queue->nr_hw_queues != 1 &&
test_bit(WriteMostly, &rdev->flags));
}
void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
bool is_suspend)
{
int ret = 0;
if (rdev && !rdev_need_serial(rdev) &&
!test_bit(CollisionCheck, &rdev->flags))
return;
if (!is_suspend)
mddev_suspend(mddev);
if (!rdev)
ret = rdevs_init_serial(mddev);
else
ret = rdev_init_serial(rdev);
if (ret)
goto abort;
if (mddev->serial_info_pool == NULL) {
mddev->serial_info_pool =
mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
sizeof(struct serial_info));
if (!mddev->serial_info_pool) {
rdevs_uninit_serial(mddev);
pr_err("can't alloc memory pool for serialization\n");
}
}
abort:
if (!is_suspend)
mddev_resume(mddev);
}
void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
bool is_suspend)
{
if (rdev && !test_bit(CollisionCheck, &rdev->flags))
return;
if (mddev->serial_info_pool) {
struct md_rdev *temp;
int num = 0;
if (!is_suspend)
mddev_suspend(mddev);
rdev_for_each(temp, mddev) {
if (!rdev) {
if (!mddev->serialize_policy ||
!rdev_need_serial(temp))
rdev_uninit_serial(temp);
else
num++;
} else if (temp != rdev &&
test_bit(CollisionCheck, &temp->flags))
num++;
}
if (rdev)
rdev_uninit_serial(rdev);
if (num)
pr_info("The mempool could be used by other devices\n");
else {
mempool_destroy(mddev->serial_info_pool);
mddev->serial_info_pool = NULL;
}
if (!is_suspend)
mddev_resume(mddev);
}
}
static struct ctl_table_header *raid_table_header;
static struct ctl_table raid_table[] = {
{
.procname = "speed_limit_min",
.data = &sysctl_speed_limit_min,
.maxlen = sizeof(int),
.mode = S_IRUGO|S_IWUSR,
.proc_handler = proc_dointvec,
},
{
.procname = "speed_limit_max",
.data = &sysctl_speed_limit_max,
.maxlen = sizeof(int),
.mode = S_IRUGO|S_IWUSR,
.proc_handler = proc_dointvec,
},
{ }
};
static int start_readonly;
static bool create_on_open = true;
static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
static atomic_t md_event_count;
void md_new_event(void)
{
atomic_inc(&md_event_count);
wake_up(&md_event_waiters);
}
EXPORT_SYMBOL_GPL(md_new_event);
static LIST_HEAD(all_mddevs);
static DEFINE_SPINLOCK(all_mddevs_lock);
static bool is_suspended(struct mddev *mddev, struct bio *bio)
{
if (is_md_suspended(mddev))
return true;
if (bio_data_dir(bio) != WRITE)
return false;
if (mddev->suspend_lo >= mddev->suspend_hi)
return false;
if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
return false;
if (bio_end_sector(bio) < mddev->suspend_lo)
return false;
return true;
}
void md_handle_request(struct mddev *mddev, struct bio *bio)
{
check_suspended:
if (is_suspended(mddev, bio)) {
DEFINE_WAIT(__wait);
if (bio->bi_opf & REQ_NOWAIT) {
bio_wouldblock_error(bio);
return;
}
for (;;) {
prepare_to_wait(&mddev->sb_wait, &__wait,
TASK_UNINTERRUPTIBLE);
if (!is_suspended(mddev, bio))
break;
schedule();
}
finish_wait(&mddev->sb_wait, &__wait);
}
if (!percpu_ref_tryget_live(&mddev->active_io))
goto check_suspended;
if (!mddev->pers->make_request(mddev, bio)) {
percpu_ref_put(&mddev->active_io);
goto check_suspended;
}
percpu_ref_put(&mddev->active_io);
}
EXPORT_SYMBOL(md_handle_request);
static void md_submit_bio(struct bio *bio)
{
const int rw = bio_data_dir(bio);
struct mddev *mddev = bio->bi_bdev->bd_disk->private_data;
if (mddev == NULL || mddev->pers == NULL) {
bio_io_error(bio);
return;
}
if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
bio_io_error(bio);
return;
}
bio = bio_split_to_limits(bio);
if (!bio)
return;
if (mddev->ro == MD_RDONLY && unlikely(rw == WRITE)) {
if (bio_sectors(bio) != 0)
bio->bi_status = BLK_STS_IOERR;
bio_endio(bio);
return;
}
bio->bi_opf &= ~REQ_NOMERGE;
md_handle_request(mddev, bio);
}
void mddev_suspend(struct mddev *mddev)
{
struct md_thread *thread = rcu_dereference_protected(mddev->thread,
lockdep_is_held(&mddev->reconfig_mutex));
WARN_ON_ONCE(thread && current == thread->tsk);
if (mddev->suspended++)
return;
wake_up(&mddev->sb_wait);
set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
percpu_ref_kill(&mddev->active_io);
if (mddev->pers->prepare_suspend)
mddev->pers->prepare_suspend(mddev);
wait_event(mddev->sb_wait, percpu_ref_is_zero(&mddev->active_io));
clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
del_timer_sync(&mddev->safemode_timer);
mddev->noio_flag = memalloc_noio_save();
}
EXPORT_SYMBOL_GPL(mddev_suspend);
void mddev_resume(struct mddev *mddev)
{
lockdep_assert_held(&mddev->reconfig_mutex);
if (--mddev->suspended)
return;
memalloc_noio_restore(mddev->noio_flag);
percpu_ref_resurrect(&mddev->active_io);
wake_up(&mddev->sb_wait);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread);
}
EXPORT_SYMBOL_GPL(mddev_resume);
static void md_end_flush(struct bio *bio)
{
struct md_rdev *rdev = bio->bi_private;
struct mddev *mddev = rdev->mddev;
bio_put(bio);
rdev_dec_pending(rdev, mddev);
if (atomic_dec_and_test(&mddev->flush_pending)) {
queue_work(md_wq, &mddev->flush_work);
}
}
static void md_submit_flush_data(struct work_struct *ws);
static void submit_flushes(struct work_struct *ws)
{
struct mddev *mddev = container_of(ws, struct mddev, flush_work);
struct md_rdev *rdev;
mddev->start_flush = ktime_get_boottime();
INIT_WORK(&mddev->flush_work, md_submit_flush_data);
atomic_set(&mddev->flush_pending, 1);
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(Faulty, &rdev->flags)) {
struct bio *bi;
atomic_inc(&rdev->nr_pending);
atomic_inc(&rdev->nr_pending);
rcu_read_unlock();
bi = bio_alloc_bioset(rdev->bdev, 0,
REQ_OP_WRITE | REQ_PREFLUSH,
GFP_NOIO, &mddev->bio_set);
bi->bi_end_io = md_end_flush;
bi->bi_private = rdev;
atomic_inc(&mddev->flush_pending);
submit_bio(bi);
rcu_read_lock();
rdev_dec_pending(rdev, mddev);
}
rcu_read_unlock();
if (atomic_dec_and_test(&mddev->flush_pending))
queue_work(md_wq, &mddev->flush_work);
}
static void md_submit_flush_data(struct work_struct *ws)
{
struct mddev *mddev = container_of(ws, struct mddev, flush_work);
struct bio *bio = mddev->flush_bio;
spin_lock_irq(&mddev->lock);
mddev->prev_flush_start = mddev->start_flush;
mddev->flush_bio = NULL;
spin_unlock_irq(&mddev->lock);
wake_up(&mddev->sb_wait);
if (bio->bi_iter.bi_size == 0) {
bio_endio(bio);
} else {
bio->bi_opf &= ~REQ_PREFLUSH;
md_handle_request(mddev, bio);
}
}
bool md_flush_request(struct mddev *mddev, struct bio *bio)
{
ktime_t req_start = ktime_get_boottime();
spin_lock_irq(&mddev->lock);
wait_event_lock_irq(mddev->sb_wait,
!mddev->flush_bio ||
ktime_before(req_start, mddev->prev_flush_start),
mddev->lock);
if (ktime_after(req_start, mddev->prev_flush_start)) {
WARN_ON(mddev->flush_bio);
mddev->flush_bio = bio;
bio = NULL;
}
spin_unlock_irq(&mddev->lock);
if (!bio) {
INIT_WORK(&mddev->flush_work, submit_flushes);
queue_work(md_wq, &mddev->flush_work);
} else {
if (bio->bi_iter.bi_size == 0)
bio_endio(bio);
else {
bio->bi_opf &= ~REQ_PREFLUSH;
return false;
}
}
return true;
}
EXPORT_SYMBOL(md_flush_request);
static inline struct mddev *mddev_get(struct mddev *mddev)
{
lockdep_assert_held(&all_mddevs_lock);
if (test_bit(MD_DELETED, &mddev->flags))
return NULL;
atomic_inc(&mddev->active);
return mddev;
}
static void mddev_delayed_delete(struct work_struct *ws);
void mddev_put(struct mddev *mddev)
{
if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
return;
if (!mddev->raid_disks && list_empty(&mddev->disks) &&
mddev->ctime == 0 && !mddev->hold_active) {
set_bit(MD_DELETED, &mddev->flags);
INIT_WORK(&mddev->del_work, mddev_delayed_delete);
queue_work(md_misc_wq, &mddev->del_work);
}
spin_unlock(&all_mddevs_lock);
}
static void md_safemode_timeout(struct timer_list *t);
void mddev_init(struct mddev *mddev)
{
mutex_init(&mddev->open_mutex);
mutex_init(&mddev->reconfig_mutex);
mutex_init(&mddev->sync_mutex);
mutex_init(&mddev->bitmap_info.mutex);
INIT_LIST_HEAD(&mddev->disks);
INIT_LIST_HEAD(&mddev->all_mddevs);
INIT_LIST_HEAD(&mddev->deleting);
timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
atomic_set(&mddev->active, 1);
atomic_set(&mddev->openers, 0);
atomic_set(&mddev->sync_seq, 0);
spin_lock_init(&mddev->lock);
atomic_set(&mddev->flush_pending, 0);
init_waitqueue_head(&mddev->sb_wait);
init_waitqueue_head(&mddev->recovery_wait);
mddev->reshape_position = MaxSector;
mddev->reshape_backwards = 0;
mddev->last_sync_action = "none";
mddev->resync_min = 0;
mddev->resync_max = MaxSector;
mddev->level = LEVEL_NONE;
}
EXPORT_SYMBOL_GPL(mddev_init);
static struct mddev *mddev_find_locked(dev_t unit)
{
struct mddev *mddev;
list_for_each_entry(mddev, &all_mddevs, all_mddevs)
if (mddev->unit == unit)
return mddev;
return NULL;
}
static dev_t mddev_alloc_unit(void)
{
static int next_minor = 512;
int start = next_minor;
bool is_free = 0;
dev_t dev = 0;
while (!is_free) {
dev = MKDEV(MD_MAJOR, next_minor);
next_minor++;
if (next_minor > MINORMASK)
next_minor = 0;
if (next_minor == start)
return 0;
is_free = !mddev_find_locked(dev);
}
return dev;
}
static struct mddev *mddev_alloc(dev_t unit)
{
struct mddev *new;
int error;
if (unit && MAJOR(unit) != MD_MAJOR)
unit &= ~((1 << MdpMinorShift) - 1);
new = kzalloc(sizeof(*new), GFP_KERNEL);
if (!new)
return ERR_PTR(-ENOMEM);
mddev_init(new);
spin_lock(&all_mddevs_lock);
if (unit) {
error = -EEXIST;
if (mddev_find_locked(unit))
goto out_free_new;
new->unit = unit;
if (MAJOR(unit) == MD_MAJOR)
new->md_minor = MINOR(unit);
else
new->md_minor = MINOR(unit) >> MdpMinorShift;
new->hold_active = UNTIL_IOCTL;
} else {
error = -ENODEV;
new->unit = mddev_alloc_unit();
if (!new->unit)
goto out_free_new;
new->md_minor = MINOR(new->unit);
new->hold_active = UNTIL_STOP;
}
list_add(&new->all_mddevs, &all_mddevs);
spin_unlock(&all_mddevs_lock);
return new;
out_free_new:
spin_unlock(&all_mddevs_lock);
kfree(new);
return ERR_PTR(error);
}
static void mddev_free(struct mddev *mddev)
{
spin_lock(&all_mddevs_lock);
list_del(&mddev->all_mddevs);
spin_unlock(&all_mddevs_lock);
kfree(mddev);
}
static const struct attribute_group md_redundancy_group;
void mddev_unlock(struct mddev *mddev)
{
struct md_rdev *rdev;
struct md_rdev *tmp;
LIST_HEAD(delete);
if (!list_empty(&mddev->deleting))
list_splice_init(&mddev->deleting, &delete);
if (mddev->to_remove) {
const struct attribute_group *to_remove = mddev->to_remove;
mddev->to_remove = NULL;
mddev->sysfs_active = 1;
mutex_unlock(&mddev->reconfig_mutex);
if (mddev->kobj.sd) {
if (to_remove != &md_redundancy_group)
sysfs_remove_group(&mddev->kobj, to_remove);
if (mddev->pers == NULL ||
mddev->pers->sync_request == NULL) {
sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
if (mddev->sysfs_action)
sysfs_put(mddev->sysfs_action);
if (mddev->sysfs_completed)
sysfs_put(mddev->sysfs_completed);
if (mddev->sysfs_degraded)
sysfs_put(mddev->sysfs_degraded);
mddev->sysfs_action = NULL;
mddev->sysfs_completed = NULL;
mddev->sysfs_degraded = NULL;
}
}
mddev->sysfs_active = 0;
} else
mutex_unlock(&mddev->reconfig_mutex);
md_wakeup_thread(mddev->thread);
wake_up(&mddev->sb_wait);
list_for_each_entry_safe(rdev, tmp, &delete, same_set) {
list_del_init(&rdev->same_set);
kobject_del(&rdev->kobj);
export_rdev(rdev, mddev);
}
}
EXPORT_SYMBOL_GPL(mddev_unlock);
struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
{
struct md_rdev *rdev;
rdev_for_each_rcu(rdev, mddev)
if (rdev->desc_nr == nr)
return rdev;
return NULL;
}
EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
{
struct md_rdev *rdev;
rdev_for_each(rdev, mddev)
if (rdev->bdev->bd_dev == dev)
return rdev;
return NULL;
}
struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
{
struct md_rdev *rdev;
rdev_for_each_rcu(rdev, mddev)
if (rdev->bdev->bd_dev == dev)
return rdev;
return NULL;
}
EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
static struct md_personality *find_pers(int level, char *clevel)
{
struct md_personality *pers;
list_for_each_entry(pers, &pers_list, list) {
if (level != LEVEL_NONE && pers->level == level)
return pers;
if (strcmp(pers->name, clevel)==0)
return pers;
}
return NULL;
}
static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
{
return MD_NEW_SIZE_SECTORS(bdev_nr_sectors(rdev->bdev));
}
static int alloc_disk_sb(struct md_rdev *rdev)
{
rdev->sb_page = alloc_page(GFP_KERNEL);
if (!rdev->sb_page)
return -ENOMEM;
return 0;
}
void md_rdev_clear(struct md_rdev *rdev)
{
if (rdev->sb_page) {
put_page(rdev->sb_page);
rdev->sb_loaded = 0;
rdev->sb_page = NULL;
rdev->sb_start = 0;
rdev->sectors = 0;
}
if (rdev->bb_page) {
put_page(rdev->bb_page);
rdev->bb_page = NULL;
}
badblocks_exit(&rdev->badblocks);
}
EXPORT_SYMBOL_GPL(md_rdev_clear);
static void super_written(struct bio *bio)
{
struct md_rdev *rdev = bio->bi_private;
struct mddev *mddev = rdev->mddev;
if (bio->bi_status) {
pr_err("md: %s gets error=%d\n", __func__,
blk_status_to_errno(bio->bi_status));
md_error(mddev, rdev);
if (!test_bit(Faulty, &rdev->flags)
&& (bio->bi_opf & MD_FAILFAST)) {
set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
set_bit(LastDev, &rdev->flags);
}
} else
clear_bit(LastDev, &rdev->flags);
bio_put(bio);
rdev_dec_pending(rdev, mddev);
if (atomic_dec_and_test(&mddev->pending_writes))
wake_up(&mddev->sb_wait);
}
void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
sector_t sector, int size, struct page *page)
{
struct bio *bio;
if (!page)
return;
if (test_bit(Faulty, &rdev->flags))
return;
bio = bio_alloc_bioset(rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev,
1,
REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA,
GFP_NOIO, &mddev->sync_set);
atomic_inc(&rdev->nr_pending);
bio->bi_iter.bi_sector = sector;
__bio_add_page(bio, page, size, 0);
bio->bi_private = rdev;
bio->bi_end_io = super_written;
if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
test_bit(FailFast, &rdev->flags) &&
!test_bit(LastDev, &rdev->flags))
bio->bi_opf |= MD_FAILFAST;
atomic_inc(&mddev->pending_writes);
submit_bio(bio);
}
int md_super_wait(struct mddev *mddev)
{
wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
return -EAGAIN;
return 0;
}
int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
struct page *page, blk_opf_t opf, bool metadata_op)
{
struct bio bio;
struct bio_vec bvec;
if (metadata_op && rdev->meta_bdev)
bio_init(&bio, rdev->meta_bdev, &bvec, 1, opf);
else
bio_init(&bio, rdev->bdev, &bvec, 1, opf);
if (metadata_op)
bio.bi_iter.bi_sector = sector + rdev->sb_start;
else if (rdev->mddev->reshape_position != MaxSector &&
(rdev->mddev->reshape_backwards ==
(sector >= rdev->mddev->reshape_position)))
bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
else
bio.bi_iter.bi_sector = sector + rdev->data_offset;
__bio_add_page(&bio, page, size, 0);
submit_bio_wait(&bio);
return !bio.bi_status;
}
EXPORT_SYMBOL_GPL(sync_page_io);
static int read_disk_sb(struct md_rdev *rdev, int size)
{
if (rdev->sb_loaded)
return 0;
if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, true))
goto fail;
rdev->sb_loaded = 1;
return 0;
fail:
pr_err("md: disabled device %pg, could not read superblock.\n",
rdev->bdev);
return -EINVAL;
}
static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
{
return sb1->set_uuid0 == sb2->set_uuid0 &&
sb1->set_uuid1 == sb2->set_uuid1 &&
sb1->set_uuid2 == sb2->set_uuid2 &&
sb1->set_uuid3 == sb2->set_uuid3;
}
static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
{
int ret;
mdp_super_t *tmp1, *tmp2;
tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
if (!tmp1 || !tmp2) {
ret = 0;
goto abort;
}
*tmp1 = *sb1;
*tmp2 = *sb2;
tmp1->nr_disks = 0;
tmp2->nr_disks = 0;
ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
abort:
kfree(tmp1);
kfree(tmp2);
return ret;
}
static u32 md_csum_fold(u32 csum)
{
csum = (csum & 0xffff) + (csum >> 16);
return (csum & 0xffff) + (csum >> 16);
}
static unsigned int calc_sb_csum(mdp_super_t *sb)
{
u64 newcsum = 0;
u32 *sb32 = (u32*)sb;
int i;
unsigned int disk_csum, csum;
disk_csum = sb->sb_csum;
sb->sb_csum = 0;
for (i = 0; i < MD_SB_BYTES/4 ; i++)
newcsum += sb32[i];
csum = (newcsum & 0xffffffff) + (newcsum>>32);
#ifdef CONFIG_ALPHA
sb->sb_csum = md_csum_fold(disk_csum);
#else
sb->sb_csum = disk_csum;
#endif
return csum;
}
struct super_type {
char *name;
struct module *owner;
int (*load_super)(struct md_rdev *rdev,
struct md_rdev *refdev,
int minor_version);
int (*validate_super)(struct mddev *mddev,
struct md_rdev *rdev);
void (*sync_super)(struct mddev *mddev,
struct md_rdev *rdev);
unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
sector_t num_sectors);
int (*allow_new_offset)(struct md_rdev *rdev,
unsigned long long new_offset);
};
int md_check_no_bitmap(struct mddev *mddev)
{
if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
return 0;
pr_warn("%s: bitmaps are not supported for %s\n",
mdname(mddev), mddev->pers->name);
return 1;
}
EXPORT_SYMBOL(md_check_no_bitmap);
static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
{
mdp_super_t *sb;
int ret;
bool spare_disk = true;
rdev->sb_start = calc_dev_sboffset(rdev);
ret = read_disk_sb(rdev, MD_SB_BYTES);
if (ret)
return ret;
ret = -EINVAL;
sb = page_address(rdev->sb_page);
if (sb->md_magic != MD_SB_MAGIC) {
pr_warn("md: invalid raid superblock magic on %pg\n",
rdev->bdev);
goto abort;
}
if (sb->major_version != 0 ||
sb->minor_version < 90 ||
sb->minor_version > 91) {
pr_warn("Bad version number %d.%d on %pg\n",
sb->major_version, sb->minor_version, rdev->bdev);
goto abort;
}
if (sb->raid_disks <= 0)
goto abort;
if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
pr_warn("md: invalid superblock checksum on %pg\n", rdev->bdev);
goto abort;
}
rdev->preferred_minor = sb->md_minor;
rdev->data_offset = 0;
rdev->new_data_offset = 0;
rdev->sb_size = MD_SB_BYTES;
rdev->badblocks.shift = -1;
if (sb->level == LEVEL_MULTIPATH)
rdev->desc_nr = -1;
else
rdev->desc_nr = sb->this_disk.number;
if (sb->level == LEVEL_MULTIPATH ||
(rdev->desc_nr >= 0 &&
rdev->desc_nr < MD_SB_DISKS &&
sb->disks[rdev->desc_nr].state &
((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
spare_disk = false;
if (!refdev) {
if (!spare_disk)
ret = 1;
else
ret = 0;
} else {
__u64 ev1, ev2;
mdp_super_t *refsb = page_address(refdev->sb_page);
if (!md_uuid_equal(refsb, sb)) {
pr_warn("md: %pg has different UUID to %pg\n",
rdev->bdev, refdev->bdev);
goto abort;
}
if (!md_sb_equal(refsb, sb)) {
pr_warn("md: %pg has same UUID but different superblock to %pg\n",
rdev->bdev, refdev->bdev);
goto abort;
}
ev1 = md_event(sb);
ev2 = md_event(refsb);
if (!spare_disk && ev1 > ev2)
ret = 1;
else
ret = 0;
}
rdev->sectors = rdev->sb_start;
if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
rdev->sectors = (sector_t)(2ULL << 32) - 2;
if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
ret = -EINVAL;
abort:
return ret;
}
static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
{
mdp_disk_t *desc;
mdp_super_t *sb = page_address(rdev->sb_page);
__u64 ev1 = md_event(sb);
rdev->raid_disk = -1;
clear_bit(Faulty, &rdev->flags);
clear_bit(In_sync, &rdev->flags);
clear_bit(Bitmap_sync, &rdev->flags);
clear_bit(WriteMostly, &rdev->flags);
if (mddev->raid_disks == 0) {
mddev->major_version = 0;
mddev->minor_version = sb->minor_version;
mddev->patch_version = sb->patch_version;
mddev->external = 0;
mddev->chunk_sectors = sb->chunk_size >> 9;
mddev->ctime = sb->ctime;
mddev->utime = sb->utime;
mddev->level = sb->level;
mddev->clevel[0] = 0;
mddev->layout = sb->layout;
mddev->raid_disks = sb->raid_disks;
mddev->dev_sectors = ((sector_t)sb->size) * 2;
mddev->events = ev1;
mddev->bitmap_info.offset = 0;
mddev->bitmap_info.space = 0;
mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
mddev->reshape_backwards = 0;
if (mddev->minor_version >= 91) {
mddev->reshape_position = sb->reshape_position;
mddev->delta_disks = sb->delta_disks;
mddev->new_level = sb->new_level;
mddev->new_layout = sb->new_layout;
mddev->new_chunk_sectors = sb->new_chunk >> 9;
if (mddev->delta_disks < 0)
mddev->reshape_backwards = 1;
} else {
mddev->reshape_position = MaxSector;
mddev->delta_disks = 0;
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
mddev->new_chunk_sectors = mddev->chunk_sectors;
}
if (mddev->level == 0)
mddev->layout = -1;
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;
if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
mddev->bitmap_info.file == NULL) {
mddev->bitmap_info.offset =
mddev->bitmap_info.default_offset;
mddev->bitmap_info.space =
mddev->bitmap_info.default_space;
}
} else if (mddev->pers == NULL) {
++ev1;
if (sb->disks[rdev->desc_nr].state & (
(1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
if (ev1 < mddev->events)
return -EINVAL;
} else if (mddev->bitmap) {
if (ev1 < mddev->bitmap->events_cleared)
return 0;
if (ev1 < mddev->events)
set_bit(Bitmap_sync, &rdev->flags);
} else {
if (ev1 < mddev->events)
return 0;
}
if (mddev->level != LEVEL_MULTIPATH) {
desc = sb->disks + rdev->desc_nr;
if (desc->state & (1<<MD_DISK_FAULTY))
set_bit(Faulty, &rdev->flags);
else if (desc->state & (1<<MD_DISK_SYNC) ) {
set_bit(In_sync, &rdev->flags);
rdev->raid_disk = desc->raid_disk;
rdev->saved_raid_disk = desc->raid_disk;
} else if (desc->state & (1<<MD_DISK_ACTIVE)) {
if (mddev->minor_version >= 91) {
rdev->recovery_offset = 0;
rdev->raid_disk = desc->raid_disk;
}
}
if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
set_bit(WriteMostly, &rdev->flags);
if (desc->state & (1<<MD_DISK_FAILFAST))
set_bit(FailFast, &rdev->flags);
} else
set_bit(In_sync, &rdev->flags);
return 0;
}
static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
{
mdp_super_t *sb;
struct md_rdev *rdev2;
int next_spare = mddev->raid_disks;
int i;
int active=0, working=0,failed=0,spare=0,nr_disks=0;
rdev->sb_size = MD_SB_BYTES;
sb = page_address(rdev->sb_page);
memset(sb, 0, sizeof(*sb));
sb->md_magic = MD_SB_MAGIC;
sb->major_version = mddev->major_version;
sb->patch_version = mddev->patch_version;
sb->gvalid_words = 0;
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 = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
sb->level = mddev->level;
sb->size = mddev->dev_sectors / 2;
sb->raid_disks = mddev->raid_disks;
sb->md_minor = mddev->md_minor;
sb->not_persistent = 0;
sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
sb->state = 0;
sb->events_hi = (mddev->events>>32);
sb->events_lo = (u32)mddev->events;
if (mddev->reshape_position == MaxSector)
sb->minor_version = 90;
else {
sb->minor_version = 91;
sb->reshape_position = mddev->reshape_position;
sb->new_level = mddev->new_level;
sb->delta_disks = mddev->delta_disks;
sb->new_layout = mddev->new_layout;
sb->new_chunk = mddev->new_chunk_sectors << 9;
}
mddev->minor_version = sb->minor_version;
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_sectors << 9;
if (mddev->bitmap && mddev->bitmap_info.file == NULL)
sb->state |= (1<<MD_SB_BITMAP_PRESENT);
sb->disks[0].state = (1<<MD_DISK_REMOVED);
rdev_for_each(rdev2, mddev) {
mdp_disk_t *d;
int desc_nr;
int is_active = test_bit(In_sync, &rdev2->flags);
if (rdev2->raid_disk >= 0 &&
sb->minor_version >= 91)
is_active = 1;
if (rdev2->raid_disk < 0 ||
test_bit(Faulty, &rdev2->flags))
is_active = 0;
if (is_active)
desc_nr = rdev2->raid_disk;
else
desc_nr = next_spare++;
rdev2->desc_nr = desc_nr;
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 (is_active)
d->raid_disk = rdev2->raid_disk;
else
d->raid_disk = rdev2->desc_nr;
if (test_bit(Faulty, &rdev2->flags))
d->state = (1<<MD_DISK_FAULTY);
else if (is_active) {
d->state = (1<<MD_DISK_ACTIVE);
if (test_bit(In_sync, &rdev2->flags))
d->state |= (1<<MD_DISK_SYNC);
active++;
working++;
} else {
d->state = 0;
spare++;
working++;
}
if (test_bit(WriteMostly, &rdev2->flags))
d->state |= (1<<MD_DISK_WRITEMOSTLY);
if (test_bit(FailFast, &rdev2->flags))
d->state |= (1<<MD_DISK_FAILFAST);
}
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);
}
static unsigned long long
super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
{
if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
return 0;
if (rdev->mddev->bitmap_info.offset)
return 0;
rdev->sb_start = calc_dev_sboffset(rdev);
if (!num_sectors || num_sectors > rdev->sb_start)
num_sectors = rdev->sb_start;
if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
num_sectors = (sector_t)(2ULL << 32) - 2;
do {
md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
rdev->sb_page);
} while (md_super_wait(rdev->mddev) < 0);
return num_sectors;
}
static int
super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
{
return new_offset == 0;
}
static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
{
__le32 disk_csum;
u32 csum;
unsigned long long newcsum;
int size = 256 + le32_to_cpu(sb->max_dev)*2;
__le32 *isuper = (__le32*)sb;
disk_csum = sb->sb_csum;
sb->sb_csum = 0;
newcsum = 0;
for (; size >= 4; size -= 4)
newcsum += le32_to_cpu(*isuper++);
if (size == 2)
newcsum += le16_to_cpu(*(__le16*) isuper);
csum = (newcsum & 0xffffffff) + (newcsum >> 32);
sb->sb_csum = disk_csum;
return cpu_to_le32(csum);
}
static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
{
struct mdp_superblock_1 *sb;
int ret;
sector_t sb_start;
sector_t sectors;
int bmask;
bool spare_disk = true;
switch(minor_version) {
case 0:
sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2;
sb_start &= ~(sector_t)(4*2-1);
break;
case 1:
sb_start = 0;
break;
case 2:
sb_start = 8;
break;
default:
return -EINVAL;
}
rdev->sb_start = sb_start;
ret = read_disk_sb(rdev, 4096);
if (ret) return ret;
sb = 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_start ||
(le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
return -EINVAL;
if (calc_sb_1_csum(sb) != sb->sb_csum) {
pr_warn("md: invalid superblock checksum on %pg\n",
rdev->bdev);
return -EINVAL;
}
if (le64_to_cpu(sb->data_size) < 10) {
pr_warn("md: data_size too small on %pg\n",
rdev->bdev);
return -EINVAL;
}
if (sb->pad0 ||
sb->pad3[0] ||
memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
return -EINVAL;
rdev->preferred_minor = 0xffff;
rdev->data_offset = le64_to_cpu(sb->data_offset);
rdev->new_data_offset = rdev->data_offset;
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
(le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
if (rdev->sb_size & bmask)
rdev->sb_size = (rdev->sb_size | bmask) + 1;
if (minor_version
&& rdev->data_offset < sb_start + (rdev->sb_size/512))
return -EINVAL;
if (minor_version
&& rdev->new_data_offset < sb_start + (rdev->sb_size/512))
return -EINVAL;
if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
rdev->desc_nr = -1;
else
rdev->desc_nr = le32_to_cpu(sb->dev_number);
if (!rdev->bb_page) {
rdev->bb_page = alloc_page(GFP_KERNEL);
if (!rdev->bb_page)
return -ENOMEM;
}
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
rdev->badblocks.count == 0) {
s32 offset;
sector_t bb_sector;
__le64 *bbp;
int i;
int sectors = le16_to_cpu(sb->bblog_size);
if (sectors > (PAGE_SIZE / 512))
return -EINVAL;
offset = le32_to_cpu(sb->bblog_offset);
if (offset == 0)
return -EINVAL;
bb_sector = (long long)offset;
if (!sync_page_io(rdev, bb_sector, sectors << 9,
rdev->bb_page, REQ_OP_READ, true))
return -EIO;
bbp = (__le64 *)page_address(rdev->bb_page);
rdev->badblocks.shift = sb->bblog_shift;
for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
u64 bb = le64_to_cpu(*bbp);
int count = bb & (0x3ff);
u64 sector = bb >> 10;
sector <<= sb->bblog_shift;
count <<= sb->bblog_shift;
if (bb + 1 == 0)
break;
if (badblocks_set(&rdev->badblocks, sector, count, 1))
return -EINVAL;
}
} else if (sb->bblog_offset != 0)
rdev->badblocks.shift = 0;
if ((le32_to_cpu(sb->feature_map) &
(MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
rdev->ppl.size = le16_to_cpu(sb->ppl.size);
rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
}
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
sb->level != 0)
return -EINVAL;
if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
(rdev->desc_nr >= 0 &&
rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
(le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
spare_disk = false;
if (!refdev) {
if (!spare_disk)
ret = 1;
else
ret = 0;
} else {
__u64 ev1, ev2;
struct mdp_superblock_1 *refsb = 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) {
pr_warn("md: %pg has strangely different superblock to %pg\n",
rdev->bdev,
refdev->bdev);
return -EINVAL;
}
ev1 = le64_to_cpu(sb->events);
ev2 = le64_to_cpu(refsb->events);
if (!spare_disk && ev1 > ev2)
ret = 1;
else
ret = 0;
}
if (minor_version)
sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
else
sectors = rdev->sb_start;
if (sectors < le64_to_cpu(sb->data_size))
return -EINVAL;
rdev->sectors = le64_to_cpu(sb->data_size);
return ret;
}
static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
{
struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
__u64 ev1 = le64_to_cpu(sb->events);
rdev->raid_disk = -1;
clear_bit(Faulty, &rdev->flags);
clear_bit(In_sync, &rdev->flags);
clear_bit(Bitmap_sync, &rdev->flags);
clear_bit(WriteMostly, &rdev->flags);
if (mddev->raid_disks == 0) {
mddev->major_version = 1;
mddev->patch_version = 0;
mddev->external = 0;
mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
mddev->ctime = le64_to_cpu(sb->ctime);
mddev->utime = le64_to_cpu(sb->utime);
mddev->level = le32_to_cpu(sb->level);
mddev->clevel[0] = 0;
mddev->layout = le32_to_cpu(sb->layout);
mddev->raid_disks = le32_to_cpu(sb->raid_disks);
mddev->dev_sectors = le64_to_cpu(sb->size);
mddev->events = ev1;
mddev->bitmap_info.offset = 0;
mddev->bitmap_info.space = 0;
mddev->bitmap_info.default_offset = 1024 >> 9;
mddev->bitmap_info.default_space = (4096-1024) >> 9;
mddev->reshape_backwards = 0;
mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
memcpy(mddev->uuid, sb->set_uuid, 16);
mddev->max_disks = (4096-256)/2;
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
mddev->bitmap_info.file == NULL) {
mddev->bitmap_info.offset =
(__s32)le32_to_cpu(sb->bitmap_offset);
if (mddev->minor_version > 0)
mddev->bitmap_info.space = 0;
else if (mddev->bitmap_info.offset > 0)
mddev->bitmap_info.space =
8 - mddev->bitmap_info.offset;
else
mddev->bitmap_info.space =
-mddev->bitmap_info.offset;
}
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
mddev->reshape_position = le64_to_cpu(sb->reshape_position);
mddev->delta_disks = le32_to_cpu(sb->delta_disks);
mddev->new_level = le32_to_cpu(sb->new_level);
mddev->new_layout = le32_to_cpu(sb->new_layout);
mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
if (mddev->delta_disks < 0 ||
(mddev->delta_disks == 0 &&
(le32_to_cpu(sb->feature_map)
& MD_FEATURE_RESHAPE_BACKWARDS)))
mddev->reshape_backwards = 1;
} else {
mddev->reshape_position = MaxSector;
mddev->delta_disks = 0;
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
mddev->new_chunk_sectors = mddev->chunk_sectors;
}
if (mddev->level == 0 &&
!(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
mddev->layout = -1;
if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
set_bit(MD_HAS_JOURNAL, &mddev->flags);
if (le32_to_cpu(sb->feature_map) &
(MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
if (le32_to_cpu(sb->feature_map) &
(MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
return -EINVAL;
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
(le32_to_cpu(sb->feature_map) &
MD_FEATURE_MULTIPLE_PPLS))
return -EINVAL;
set_bit(MD_HAS_PPL, &mddev->flags);
}
} else if (mddev->pers == NULL) {
++ev1;
if (rdev->desc_nr >= 0 &&
rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
(le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
if (ev1 < mddev->events)
return -EINVAL;
} else if (mddev->bitmap) {
if (ev1 < mddev->bitmap->events_cleared)
return 0;
if (ev1 < mddev->events)
set_bit(Bitmap_sync, &rdev->flags);
} else {
if (ev1 < mddev->events)
return 0;
}
if (mddev->level != LEVEL_MULTIPATH) {
int role;
if (rdev->desc_nr < 0 ||
rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
role = MD_DISK_ROLE_SPARE;
rdev->desc_nr = -1;
} else
role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
switch(role) {
case MD_DISK_ROLE_SPARE:
break;
case MD_DISK_ROLE_FAULTY:
set_bit(Faulty, &rdev->flags);
break;
case MD_DISK_ROLE_JOURNAL:
if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
pr_warn("md: journal device provided without journal feature, ignoring the device\n");
return -EINVAL;
}
set_bit(Journal, &rdev->flags);
rdev->journal_tail = le64_to_cpu(sb->journal_tail);
rdev->raid_disk = 0;
break;
default:
rdev->saved_raid_disk = role;
if ((le32_to_cpu(sb->feature_map) &
MD_FEATURE_RECOVERY_OFFSET)) {
rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
if (!(le32_to_cpu(sb->feature_map) &
MD_FEATURE_RECOVERY_BITMAP))
rdev->saved_raid_disk = -1;
} else {
if (!test_bit(MD_RECOVERY_FROZEN,
&mddev->recovery))
set_bit(In_sync, &rdev->flags);
}
rdev->raid_disk = role;
break;
}
if (sb->devflags & WriteMostly1)
set_bit(WriteMostly, &rdev->flags);
if (sb->devflags & FailFast1)
set_bit(FailFast, &rdev->flags);
if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
set_bit(Replacement, &rdev->flags);
} else
set_bit(In_sync, &rdev->flags);
return 0;
}
static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
{
struct mdp_superblock_1 *sb;
struct md_rdev *rdev2;
int max_dev, i;
sb = page_address(rdev->sb_page);
sb->feature_map = 0;
sb->pad0 = 0;
sb->recovery_offset = cpu_to_le64(0);
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 if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
sb->resync_offset = cpu_to_le64(MaxSector);
else
sb->resync_offset = cpu_to_le64(0);
sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
sb->raid_disks = cpu_to_le32(mddev->raid_disks);
sb->size = cpu_to_le64(mddev->dev_sectors);
sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
sb->level = cpu_to_le32(mddev->level);
sb->layout = cpu_to_le32(mddev->layout);
if (test_bit(FailFast, &rdev->flags))
sb->devflags |= FailFast1;
else
sb->devflags &= ~FailFast1;
if (test_bit(WriteMostly, &rdev->flags))
sb->devflags |= WriteMostly1;
else
sb->devflags &= ~WriteMostly1;
sb->data_offset = cpu_to_le64(rdev->data_offset);
sb->data_size = cpu_to_le64(rdev->sectors);
if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
}
if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags)) {
sb->feature_map |=
cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
sb->recovery_offset =
cpu_to_le64(rdev->recovery_offset);
if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
sb->feature_map |=
cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
}
if (test_bit(Journal, &rdev->flags))
sb->journal_tail = cpu_to_le64(rdev->journal_tail);
if (test_bit(Replacement, &rdev->flags))
sb->feature_map |=
cpu_to_le32(MD_FEATURE_REPLACEMENT);
if (mddev->reshape_position != MaxSector) {
sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
sb->reshape_position = cpu_to_le64(mddev->reshape_position);
sb->new_layout = cpu_to_le32(mddev->new_layout);
sb->delta_disks = cpu_to_le32(mddev->delta_disks);
sb->new_level = cpu_to_le32(mddev->new_level);
sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
if (mddev->delta_disks == 0 &&
mddev->reshape_backwards)
sb->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
if (rdev->new_data_offset != rdev->data_offset) {
sb->feature_map
|= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
- rdev->data_offset));
}
}
if (mddev_is_clustered(mddev))
sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
if (rdev->badblocks.count == 0)
;
else if (sb->bblog_offset == 0)
md_error(mddev, rdev);
else {
struct badblocks *bb = &rdev->badblocks;
__le64 *bbp = (__le64 *)page_address(rdev->bb_page);
u64 *p = bb->page;
sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
if (bb->changed) {
unsigned seq;
retry:
seq = read_seqbegin(&bb->lock);
memset(bbp, 0xff, PAGE_SIZE);
for (i = 0 ; i < bb->count ; i++) {
u64 internal_bb = p[i];
u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
| BB_LEN(internal_bb));
bbp[i] = cpu_to_le64(store_bb);
}
bb->changed = 0;
if (read_seqretry(&bb->lock, seq))
goto retry;
bb->sector = (rdev->sb_start +
(int)le32_to_cpu(sb->bblog_offset));
bb->size = le16_to_cpu(sb->bblog_size);
}
}
max_dev = 0;
rdev_for_each(rdev2, mddev)
if (rdev2->desc_nr+1 > max_dev)
max_dev = rdev2->desc_nr+1;
if (max_dev > le32_to_cpu(sb->max_dev)) {
int bmask;
sb->max_dev = cpu_to_le32(max_dev);
rdev->sb_size = max_dev * 2 + 256;
bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
if (rdev->sb_size & bmask)
rdev->sb_size = (rdev->sb_size | bmask) + 1;
} else
max_dev = le32_to_cpu(sb->max_dev);
for (i=0; i<max_dev;i++)
sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
if (test_bit(MD_HAS_PPL, &mddev->flags)) {
if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
sb->feature_map |=
cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
else
sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
sb->ppl.size = cpu_to_le16(rdev->ppl.size);
}
rdev_for_each(rdev2, mddev) {
i = rdev2->desc_nr;
if (test_bit(Faulty, &rdev2->flags))
sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
else if (test_bit(In_sync, &rdev2->flags))
sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
else if (test_bit(Journal, &rdev2->flags))
sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
else if (rdev2->raid_disk >= 0)
sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
else
sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
}
sb->sb_csum = calc_sb_1_csum(sb);
}
static sector_t super_1_choose_bm_space(sector_t dev_size)
{
sector_t bm_space;
if (dev_size < 64*2)
bm_space = 0;
else if (dev_size - 64*2 >= 200*1024*1024*2)
bm_space = 128*2;
else if (dev_size - 4*2 > 8*1024*1024*2)
bm_space = 64*2;
else
bm_space = 4*2;
return bm_space;
}
static unsigned long long
super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
{
struct mdp_superblock_1 *sb;
sector_t max_sectors;
if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
return 0;
if (rdev->data_offset != rdev->new_data_offset)
return 0;
if (rdev->sb_start < rdev->data_offset) {
max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
if (!num_sectors || num_sectors > max_sectors)
num_sectors = max_sectors;
} else if (rdev->mddev->bitmap_info.offset) {
return 0;
} else {
sector_t sb_start, bm_space;
sector_t dev_size = bdev_nr_sectors(rdev->bdev);
sb_start = dev_size - 8*2;
sb_start &= ~(sector_t)(4*2 - 1);
bm_space = super_1_choose_bm_space(dev_size);
max_sectors = sb_start - bm_space - 4*2;
if (!num_sectors || num_sectors > max_sectors)
num_sectors = max_sectors;
rdev->sb_start = sb_start;
}
sb = page_address(rdev->sb_page);
sb->data_size = cpu_to_le64(num_sectors);
sb->super_offset = cpu_to_le64(rdev->sb_start);
sb->sb_csum = calc_sb_1_csum(sb);
do {
md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
rdev->sb_page);
} while (md_super_wait(rdev->mddev) < 0);
return num_sectors;
}
static int
super_1_allow_new_offset(struct md_rdev *rdev,
unsigned long long new_offset)
{
struct bitmap *bitmap;
if (new_offset >= rdev->data_offset)
return 1;
if (rdev->mddev->minor_version == 0)
return 1;
if (rdev->sb_start + (32+4)*2 > new_offset)
return 0;
bitmap = rdev->mddev->bitmap;
if (bitmap && !rdev->mddev->bitmap_info.file &&
rdev->sb_start + rdev->mddev->bitmap_info.offset +
bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
return 0;
if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
return 0;
return 1;
}
static 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,
.rdev_size_change = super_90_rdev_size_change,
.allow_new_offset = super_90_allow_new_offset,
},
[1] = {
.name = "md-1",
.owner = THIS_MODULE,
.load_super = super_1_load,
.validate_super = super_1_validate,
.sync_super = super_1_sync,
.rdev_size_change = super_1_rdev_size_change,
.allow_new_offset = super_1_allow_new_offset,
},
};
static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
{
if (mddev->sync_super) {
mddev->sync_super(mddev, rdev);
return;
}
BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
super_types[mddev->major_version].sync_super(mddev, rdev);
}
static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
{
struct md_rdev *rdev, *rdev2;
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev1) {
if (test_bit(Faulty, &rdev->flags) ||
test_bit(Journal, &rdev->flags) ||
rdev->raid_disk == -1)
continue;
rdev_for_each_rcu(rdev2, mddev2) {
if (test_bit(Faulty, &rdev2->flags) ||
test_bit(Journal, &rdev2->flags) ||
rdev2->raid_disk == -1)
continue;
if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
rcu_read_unlock();
return 1;
}
}
}
rcu_read_unlock();
return 0;
}
static LIST_HEAD(pending_raid_disks);
int md_integrity_register(struct mddev *mddev)
{
struct md_rdev *rdev, *reference = NULL;
if (list_empty(&mddev->disks))
return 0;
if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
return 0;
rdev_for_each(rdev, mddev) {
if (test_bit(Faulty, &rdev->flags))
continue;
if (rdev->raid_disk < 0)
continue;
if (!reference) {
reference = rdev;
continue;
}
if (blk_integrity_compare(reference->bdev->bd_disk,
rdev->bdev->bd_disk) < 0)
return -EINVAL;
}
if (!reference || !bdev_get_integrity(reference->bdev))
return 0;
blk_integrity_register(mddev->gendisk,
bdev_get_integrity(reference->bdev));
pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
(mddev->level != 1 && mddev->level != 10 &&
bioset_integrity_create(&mddev->io_clone_set, BIO_POOL_SIZE))) {
pr_err("md: failed to create integrity pool for %s\n",
mdname(mddev));
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL(md_integrity_register);
int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
{
struct blk_integrity *bi_mddev;
if (!mddev->gendisk)
return 0;
bi_mddev = blk_get_integrity(mddev->gendisk);
if (!bi_mddev)
return 0;
if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
pr_err("%s: incompatible integrity profile for %pg\n",
mdname(mddev), rdev->bdev);
return -ENXIO;
}
return 0;
}
EXPORT_SYMBOL(md_integrity_add_rdev);
static bool rdev_read_only(struct md_rdev *rdev)
{
return bdev_read_only(rdev->bdev) ||
(rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
}
static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
{
char b[BDEVNAME_SIZE];
int err;
if (find_rdev(mddev, rdev->bdev->bd_dev))
return -EEXIST;
if (rdev_read_only(rdev) && mddev->pers)
return -EROFS;
if (!test_bit(Journal, &rdev->flags) &&
rdev->sectors &&
(mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
if (mddev->pers) {
if (mddev->level > 0)
return -ENOSPC;
} else
mddev->dev_sectors = rdev->sectors;
}
rcu_read_lock();
if (rdev->desc_nr < 0) {
int choice = 0;
if (mddev->pers)
choice = mddev->raid_disks;
while (md_find_rdev_nr_rcu(mddev, choice))
choice++;
rdev->desc_nr = choice;
} else {
if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
rcu_read_unlock();
return -EBUSY;
}
}
rcu_read_unlock();
if (!test_bit(Journal, &rdev->flags) &&
mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
pr_warn("md: %s: array is limited to %d devices\n",
mdname(mddev), mddev->max_disks);
return -EBUSY;
}
snprintf(b, sizeof(b), "%pg", rdev->bdev);
strreplace(b, '/', '!');
rdev->mddev = mddev;
pr_debug("md: bind<%s>\n", b);
if (mddev->raid_disks)
mddev_create_serial_pool(mddev, rdev, false);
if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
goto fail;
err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
rdev->sysfs_unack_badblocks =
sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
rdev->sysfs_badblocks =
sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
list_add_rcu(&rdev->same_set, &mddev->disks);
bd_link_disk_holder(rdev->bdev, mddev->gendisk);
mddev->recovery_disabled++;
return 0;
fail:
pr_warn("md: failed to register dev-%s for %s\n",
b, mdname(mddev));
return err;
}
void md_autodetect_dev(dev_t dev);
static struct md_rdev claim_rdev;
static void export_rdev(struct md_rdev *rdev, struct mddev *mddev)
{
pr_debug("md: export_rdev(%pg)\n", rdev->bdev);
md_rdev_clear(rdev);
#ifndef MODULE
if (test_bit(AutoDetected, &rdev->flags))
md_autodetect_dev(rdev->bdev->bd_dev);
#endif
blkdev_put(rdev->bdev,
test_bit(Holder, &rdev->flags) ? rdev : &claim_rdev);
rdev->bdev = NULL;
kobject_put(&rdev->kobj);
}
static void md_kick_rdev_from_array(struct md_rdev *rdev)
{
struct mddev *mddev = rdev->mddev;
bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
list_del_rcu(&rdev->same_set);
pr_debug("md: unbind<%pg>\n", rdev->bdev);
mddev_destroy_serial_pool(rdev->mddev, rdev, false);
rdev->mddev = NULL;
sysfs_remove_link(&rdev->kobj, "block");
sysfs_put(rdev->sysfs_state);
sysfs_put(rdev->sysfs_unack_badblocks);
sysfs_put(rdev->sysfs_badblocks);
rdev->sysfs_state = NULL;
rdev->sysfs_unack_badblocks = NULL;
rdev->sysfs_badblocks = NULL;
rdev->badblocks.count = 0;
synchronize_rcu();
list_add(&rdev->same_set, &mddev->deleting);
}
static void export_array(struct mddev *mddev)
{
struct md_rdev *rdev;
while (!list_empty(&mddev->disks)) {
rdev = list_first_entry(&mddev->disks, struct md_rdev,
same_set);
md_kick_rdev_from_array(rdev);
}
mddev->raid_disks = 0;
mddev->major_version = 0;
}
static bool set_in_sync(struct mddev *mddev)
{
lockdep_assert_held(&mddev->lock);
if (!mddev->in_sync) {
mddev->sync_checkers++;
spin_unlock(&mddev->lock);
percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
spin_lock(&mddev->lock);
if (!mddev->in_sync &&
percpu_ref_is_zero(&mddev->writes_pending)) {
mddev->in_sync = 1;
smp_mb();
set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
sysfs_notify_dirent_safe(mddev->sysfs_state);
}
if (--mddev->sync_checkers == 0)
percpu_ref_switch_to_percpu(&mddev->writes_pending);
}
if (mddev->safemode == 1)
mddev->safemode = 0;
return mddev->in_sync;
}
static void sync_sbs(struct mddev *mddev, int nospares)
{
struct md_rdev *rdev;
rdev_for_each(rdev, mddev) {
if (rdev->sb_events == mddev->events ||
(nospares &&
rdev->raid_disk < 0 &&
rdev->sb_events+1 == mddev->events)) {
rdev->sb_loaded = 2;
} else {
sync_super(mddev, rdev);
rdev->sb_loaded = 1;
}
}
}
static bool does_sb_need_changing(struct mddev *mddev)
{
struct md_rdev *rdev = NULL, *iter;
struct mdp_superblock_1 *sb;
int role;
rdev_for_each(iter, mddev)
if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
rdev = iter;
break;
}
if (!rdev)
return false;
sb = page_address(rdev->sb_page);
rdev_for_each(rdev, mddev) {
role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
if (role == MD_DISK_ROLE_SPARE && rdev->raid_disk >= 0 &&
!test_bit(Faulty, &rdev->flags))
return true;
if (test_bit(Faulty, &rdev->flags) && (role < MD_DISK_ROLE_MAX))
return true;
}
if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
(mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
(mddev->layout != le32_to_cpu(sb->layout)) ||
(mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
(mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
return true;
return false;
}
void md_update_sb(struct mddev *mddev, int force_change)
{
struct md_rdev *rdev;
int sync_req;
int nospares = 0;
int any_badblocks_changed = 0;
int ret = -1;
if (!md_is_rdwr(mddev)) {
if (force_change)
set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
return;
}
repeat:
if (mddev_is_clustered(mddev)) {
if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
force_change = 1;
if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
nospares = 1;
ret = md_cluster_ops->metadata_update_start(mddev);
if (!does_sb_need_changing(mddev)) {
if (ret == 0)
md_cluster_ops->metadata_update_cancel(mddev);
bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
BIT(MD_SB_CHANGE_DEVS) |
BIT(MD_SB_CHANGE_CLEAN));
return;
}
}
rdev_for_each(rdev, mddev) {
if (rdev->raid_disk >= 0 &&
mddev->delta_disks >= 0 &&
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
!test_bit(Journal, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags) &&
mddev->curr_resync_completed > rdev->recovery_offset)
rdev->recovery_offset = mddev->curr_resync_completed;
}
if (!mddev->persistent) {
clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
if (!mddev->external) {
clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
rdev_for_each(rdev, mddev) {
if (rdev->badblocks.changed) {
rdev->badblocks.changed = 0;
ack_all_badblocks(&rdev->badblocks);
md_error(mddev, rdev);
}
clear_bit(Blocked, &rdev->flags);
clear_bit(BlockedBadBlocks, &rdev->flags);
wake_up(&rdev->blocked_wait);
}
}
wake_up(&mddev->sb_wait);
return;
}
spin_lock(&mddev->lock);
mddev->utime = ktime_get_real_seconds();
if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
force_change = 1;
if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
nospares = 1;
if (force_change)
nospares = 0;
if (mddev->degraded)
nospares = 0;
sync_req = mddev->in_sync;
if (nospares
&& (mddev->in_sync && mddev->recovery_cp == MaxSector)
&& mddev->can_decrease_events
&& mddev->events != 1) {
mddev->events--;
mddev->can_decrease_events = 0;
} else {
mddev->events ++;
mddev->can_decrease_events = nospares;
}
WARN_ON(mddev->events == 0);
rdev_for_each(rdev, mddev) {
if (rdev->badblocks.changed)
any_badblocks_changed++;
if (test_bit(Faulty, &rdev->flags))
set_bit(FaultRecorded, &rdev->flags);
}
sync_sbs(mddev, nospares);
spin_unlock(&mddev->lock);
pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
mdname(mddev), mddev->in_sync);
if (mddev->queue)
blk_add_trace_msg(mddev->queue, "md md_update_sb");
rewrite:
md_bitmap_update_sb(mddev->bitmap);
rdev_for_each(rdev, mddev) {
if (rdev->sb_loaded != 1)
continue;
if (!test_bit(Faulty, &rdev->flags)) {
md_super_write(mddev,rdev,
rdev->sb_start, rdev->sb_size,
rdev->sb_page);
pr_debug("md: (write) %pg's sb offset: %llu\n",
rdev->bdev,
(unsigned long long)rdev->sb_start);
rdev->sb_events = mddev->events;
if (rdev->badblocks.size) {
md_super_write(mddev, rdev,
rdev->badblocks.sector,
rdev->badblocks.size << 9,
rdev->bb_page);
rdev->badblocks.size = 0;
}
} else
pr_debug("md: %pg (skipping faulty)\n",
rdev->bdev);
if (mddev->level == LEVEL_MULTIPATH)
break;
}
if (md_super_wait(mddev) < 0)
goto rewrite;
if (mddev_is_clustered(mddev) && ret == 0)
md_cluster_ops->metadata_update_finish(mddev);
if (mddev->in_sync != sync_req ||
!bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
goto repeat;
wake_up(&mddev->sb_wait);
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
sysfs_notify_dirent_safe(mddev->sysfs_completed);
rdev_for_each(rdev, mddev) {
if (test_and_clear_bit(FaultRecorded, &rdev->flags))
clear_bit(Blocked, &rdev->flags);
if (any_badblocks_changed)
ack_all_badblocks(&rdev->badblocks);
clear_bit(BlockedBadBlocks, &rdev->flags);
wake_up(&rdev->blocked_wait);
}
}
EXPORT_SYMBOL(md_update_sb);
static int add_bound_rdev(struct md_rdev *rdev)
{
struct mddev *mddev = rdev->mddev;
int err = 0;
bool add_journal = test_bit(Journal, &rdev->flags);
if (!mddev->pers->hot_remove_disk || add_journal) {
super_types[mddev->major_version].
validate_super(mddev, rdev);
if (add_journal)
mddev_suspend(mddev);
err = mddev->pers->hot_add_disk(mddev, rdev);
if (add_journal)
mddev_resume(mddev);
if (err) {
md_kick_rdev_from_array(rdev);
return err;
}
}
sysfs_notify_dirent_safe(rdev->sysfs_state);
set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
if (mddev->degraded)
set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_new_event();
md_wakeup_thread(mddev->thread);
return 0;
}
static int cmd_match(const char *cmd, const char *str)
{
while (*cmd && *str && *cmd == *str) {
cmd++;
str++;
}
if (*cmd == '\n')
cmd++;
if (*str || *cmd)
return 0;
return 1;
}
struct rdev_sysfs_entry {
struct attribute attr;
ssize_t (*show)(struct md_rdev *, char *);
ssize_t (*store)(struct md_rdev *, const char *, size_t);
};
static ssize_t
state_show(struct md_rdev *rdev, char *page)
{
char *sep = ",";
size_t len = 0;
unsigned long flags = READ_ONCE(rdev->flags);
if (test_bit(Faulty, &flags) ||
(!test_bit(ExternalBbl, &flags) &&
rdev->badblocks.unacked_exist))
len += sprintf(page+len, "faulty%s", sep);
if (test_bit(In_sync, &flags))
len += sprintf(page+len, "in_sync%s", sep);
if (test_bit(Journal, &flags))
len += sprintf(page+len, "journal%s", sep);
if (test_bit(WriteMostly, &flags))
len += sprintf(page+len, "write_mostly%s", sep);
if (test_bit(Blocked, &flags) ||
(rdev->badblocks.unacked_exist
&& !test_bit(Faulty, &flags)))
len += sprintf(page+len, "blocked%s", sep);
if (!test_bit(Faulty, &flags) &&
!test_bit(Journal, &flags) &&
!test_bit(In_sync, &flags))
len += sprintf(page+len, "spare%s", sep);
if (test_bit(WriteErrorSeen, &flags))
len += sprintf(page+len, "write_error%s", sep);
if (test_bit(WantReplacement, &flags))
len += sprintf(page+len, "want_replacement%s", sep);
if (test_bit(Replacement, &flags))
len += sprintf(page+len, "replacement%s", sep);
if (test_bit(ExternalBbl, &flags))
len += sprintf(page+len, "external_bbl%s", sep);
if (test_bit(FailFast, &flags))
len += sprintf(page+len, "failfast%s", sep);
if (len)
len -= strlen(sep);
return len+sprintf(page+len, "\n");
}
static ssize_t
state_store(struct md_rdev *rdev, const char *buf, size_t len)
{
struct mddev *mddev = rdev->mddev;
int err = -EINVAL;
bool need_update_sb = false;
if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
md_error(rdev->mddev, rdev);
if (test_bit(MD_BROKEN, &rdev->mddev->flags))
err = -EBUSY;
else
err = 0;
} else if (cmd_match(buf, "remove")) {
if (rdev->mddev->pers) {
clear_bit(Blocked, &rdev->flags);
remove_and_add_spares(rdev->mddev, rdev);
}
if (rdev->raid_disk >= 0)
err = -EBUSY;
else {
err = 0;
if (mddev_is_clustered(mddev))
err = md_cluster_ops->remove_disk(mddev, rdev);
if (err == 0) {
md_kick_rdev_from_array(rdev);
if (mddev->pers) {
set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
md_wakeup_thread(mddev->thread);
}
md_new_event();
}
}
} else if (cmd_match(buf, "writemostly")) {
set_bit(WriteMostly, &rdev->flags);
mddev_create_serial_pool(rdev->mddev, rdev, false);
need_update_sb = true;
err = 0;
} else if (cmd_match(buf, "-writemostly")) {
mddev_destroy_serial_pool(rdev->mddev, rdev, false);
clear_bit(WriteMostly, &rdev->flags);
need_update_sb = true;
err = 0;
} else if (cmd_match(buf, "blocked")) {
set_bit(Blocked, &rdev->flags);
err = 0;
} else if (cmd_match(buf, "-blocked")) {
if (!test_bit(Faulty, &rdev->flags) &&
!test_bit(ExternalBbl, &rdev->flags) &&
rdev->badblocks.unacked_exist) {
md_error(rdev->mddev, rdev);
}
clear_bit(Blocked, &rdev->flags);
clear_bit(BlockedBadBlocks, &rdev->flags);
wake_up(&rdev->blocked_wait);
set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
md_wakeup_thread(rdev->mddev->thread);
err = 0;
} else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
set_bit(In_sync, &rdev->flags);
err = 0;
} else if (cmd_match(buf, "failfast")) {
set_bit(FailFast, &rdev->flags);
need_update_sb = true;
err = 0;
} else if (cmd_match(buf, "-failfast")) {
clear_bit(FailFast, &rdev->flags);
need_update_sb = true;
err = 0;
} else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
!test_bit(Journal, &rdev->flags)) {
if (rdev->mddev->pers == NULL) {
clear_bit(In_sync, &rdev->flags);
rdev->saved_raid_disk = rdev->raid_disk;
rdev->raid_disk = -1;
err = 0;
}
} else if (cmd_match(buf, "write_error")) {
set_bit(WriteErrorSeen, &rdev->flags);
err = 0;
} else if (cmd_match(buf, "-write_error")) {
clear_bit(WriteErrorSeen, &rdev->flags);
err = 0;
} else if (cmd_match(buf, "want_replacement")) {
if (rdev->raid_disk >= 0 &&
!test_bit(Journal, &rdev->flags) &&
!test_bit(Replacement, &rdev->flags))
set_bit(WantReplacement, &rdev->flags);
set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
md_wakeup_thread(rdev->mddev->thread);
err = 0;
} else if (cmd_match(buf, "-want_replacement")) {
err = 0;
clear_bit(WantReplacement, &rdev->flags);
} else if (cmd_match(buf, "replacement")) {
if (rdev->mddev->pers)
err = -EBUSY;
else {
set_bit(Replacement, &rdev->flags);
err = 0;
}
} else if (cmd_match(buf, "-replacement")) {
if (rdev->mddev->pers)
err = -EBUSY;
else {
clear_bit(Replacement, &rdev->flags);
err = 0;
}
} else if (cmd_match(buf, "re-add")) {
if (!rdev->mddev->pers)
err = -EINVAL;
else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
rdev->saved_raid_disk >= 0) {
if (!mddev_is_clustered(rdev->mddev) ||
(err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
clear_bit(Faulty, &rdev->flags);
err = add_bound_rdev(rdev);
}
} else
err = -EBUSY;
} else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
set_bit(ExternalBbl, &rdev->flags);
rdev->badblocks.shift = 0;
err = 0;
} else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
clear_bit(ExternalBbl, &rdev->flags);
err = 0;
}
if (need_update_sb)
md_update_sb(mddev, 1);
if (!err)
sysfs_notify_dirent_safe(rdev->sysfs_state);
return err ? err : len;
}
static struct rdev_sysfs_entry rdev_state =
__ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
static ssize_t
errors_show(struct md_rdev *rdev, char *page)
{
return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
}
static ssize_t
errors_store(struct md_rdev *rdev, const char *buf, size_t len)
{
unsigned int n;
int rv;
rv = kstrtouint(buf, 10, &n);
if (rv < 0)
return rv;
atomic_set(&rdev->corrected_errors, n);
return len;
}
static struct rdev_sysfs_entry rdev_errors =
__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
static ssize_t
slot_show(struct md_rdev *rdev, char *page)
{
if (test_bit(Journal, &rdev->flags))
return sprintf(page, "journal\n");
else if (rdev->raid_disk < 0)
return sprintf(page, "none\n");
else
return sprintf(page, "%d\n", rdev->raid_disk);
}
static ssize_t
slot_store(struct md_rdev *rdev, const char *buf, size_t len)
{
int slot;
int err;
if (test_bit(Journal, &rdev->flags))
return -EBUSY;
if (strncmp(buf, "none", 4)==0)
slot = -1;
else {
err = kstrtouint(buf, 10, (unsigned int *)&slot);
if (err < 0)
return err;
if (slot < 0)
return -ENOSPC;
}
if (rdev->mddev->pers && slot == -1) {
if (rdev->raid_disk == -1)
return -EEXIST;
if (rdev->mddev->pers->hot_remove_disk == NULL)
return -EINVAL;
clear_bit(Blocked, &rdev->flags);
remove_and_add_spares(rdev->mddev, rdev);
if (rdev->raid_disk >= 0)
return -EBUSY;
set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
md_wakeup_thread(rdev->mddev->thread);
} else if (rdev->mddev->pers) {
int err;
if (rdev->raid_disk != -1)
return -EBUSY;
if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
return -EBUSY;
if (rdev->mddev->pers->hot_add_disk == NULL)
return -EINVAL;
if (slot >= rdev->mddev->raid_disks &&
slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
return -ENOSPC;
rdev->raid_disk = slot;
if (test_bit(In_sync, &rdev->flags))
rdev->saved_raid_disk = slot;
else
rdev->saved_raid_disk = -1;
clear_bit(In_sync, &rdev->flags);
clear_bit(Bitmap_sync, &rdev->flags);
err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
if (err) {
rdev->raid_disk = -1;
return err;
} else
sysfs_notify_dirent_safe(rdev->sysfs_state);
;
sysfs_link_rdev(rdev->mddev, rdev);
} else {
if (slot >= rdev->mddev->raid_disks &&
slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
return -ENOSPC;
rdev->raid_disk = slot;
clear_bit(Faulty, &rdev->flags);
clear_bit(WriteMostly, &rdev->flags);
set_bit(In_sync, &rdev->flags);
sysfs_notify_dirent_safe(rdev->sysfs_state);
}
return len;
}
static struct rdev_sysfs_entry rdev_slot =
__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
static ssize_t
offset_show(struct md_rdev *rdev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
}
static ssize_t
offset_store(struct md_rdev *rdev, const char *buf, size_t len)
{
unsigned long long offset;
if (kstrtoull(buf, 10, &offset) < 0)
return -EINVAL;
if (rdev->mddev->pers && rdev->raid_disk >= 0)
return -EBUSY;
if (rdev->sectors && rdev->mddev->external)
return -EBUSY;
rdev->data_offset = offset;
rdev->new_data_offset = offset;
return len;
}
static struct rdev_sysfs_entry rdev_offset =
__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
{
return sprintf(page, "%llu\n",
(unsigned long long)rdev->new_data_offset);
}
static ssize_t new_offset_store(struct md_rdev *rdev,
const char *buf, size_t len)
{
unsigned long long new_offset;
struct mddev *mddev = rdev->mddev;
if (kstrtoull(buf, 10, &new_offset) < 0)
return -EINVAL;
if (mddev->sync_thread ||
test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
return -EBUSY;
if (new_offset == rdev->data_offset)
;
else if (new_offset > rdev->data_offset) {
if (new_offset - rdev->data_offset
+ mddev->dev_sectors > rdev->sectors)
return -E2BIG;
}
if (new_offset < rdev->data_offset &&
mddev->reshape_backwards)
return -EINVAL;
if (new_offset > rdev->data_offset &&
!mddev->reshape_backwards)
return -EINVAL;
if (mddev->pers && mddev->persistent &&
!super_types[mddev->major_version]
.allow_new_offset(rdev, new_offset))
return -E2BIG;
rdev->new_data_offset = new_offset;
if (new_offset > rdev->data_offset)
mddev->reshape_backwards = 1;
else if (new_offset < rdev->data_offset)
mddev->reshape_backwards = 0;
return len;
}
static struct rdev_sysfs_entry rdev_new_offset =
__ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
static ssize_t
rdev_size_show(struct md_rdev *rdev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
}
static int md_rdevs_overlap(struct md_rdev *a, struct md_rdev *b)
{
if (a->data_offset + a->sectors <= b->data_offset)
return false;
if (b->data_offset + b->sectors <= a->data_offset)
return false;
return true;
}
static bool md_rdev_overlaps(struct md_rdev *rdev)
{
struct mddev *mddev;
struct md_rdev *rdev2;
spin_lock(&all_mddevs_lock);
list_for_each_entry(mddev, &all_mddevs, all_mddevs) {
if (test_bit(MD_DELETED, &mddev->flags))
continue;
rdev_for_each(rdev2, mddev) {
if (rdev != rdev2 && rdev->bdev == rdev2->bdev &&
md_rdevs_overlap(rdev, rdev2)) {
spin_unlock(&all_mddevs_lock);
return true;
}
}
}
spin_unlock(&all_mddevs_lock);
return false;
}
static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
{
unsigned long long blocks;
sector_t new;
if (kstrtoull(buf, 10, &blocks) < 0)
return -EINVAL;
if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
return -EINVAL;
new = blocks * 2;
if (new != blocks * 2)
return -EINVAL;
*sectors = new;
return 0;
}
static ssize_t
rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
{
struct mddev *my_mddev = rdev->mddev;
sector_t oldsectors = rdev->sectors;
sector_t sectors;
if (test_bit(Journal, &rdev->flags))
return -EBUSY;
if (strict_blocks_to_sectors(buf, §ors) < 0)
return -EINVAL;
if (rdev->data_offset != rdev->new_data_offset)
return -EINVAL;
if (my_mddev->pers && rdev->raid_disk >= 0) {
if (my_mddev->persistent) {
sectors = super_types[my_mddev->major_version].
rdev_size_change(rdev, sectors);
if (!sectors)
return -EBUSY;
} else if (!sectors)
sectors = bdev_nr_sectors(rdev->bdev) -
rdev->data_offset;
if (!my_mddev->pers->resize)
return -EINVAL;
}
if (sectors < my_mddev->dev_sectors)
return -EINVAL;
rdev->sectors = sectors;
if (sectors > oldsectors && my_mddev->external &&
md_rdev_overlaps(rdev)) {
rdev->sectors = oldsectors;
return -EBUSY;
}
return len;
}
static struct rdev_sysfs_entry rdev_size =
__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
{
unsigned long long recovery_start = rdev->recovery_offset;
if (test_bit(In_sync, &rdev->flags) ||
recovery_start == MaxSector)
return sprintf(page, "none\n");
return sprintf(page, "%llu\n", recovery_start);
}
static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
{
unsigned long long recovery_start;
if (cmd_match(buf, "none"))
recovery_start = MaxSector;
else if (kstrtoull(buf, 10, &recovery_start))
return -EINVAL;
if (rdev->mddev->pers &&
rdev->raid_disk >= 0)
return -EBUSY;
rdev->recovery_offset = recovery_start;
if (recovery_start == MaxSector)
set_bit(In_sync, &rdev->flags);
else
clear_bit(In_sync, &rdev->flags);
return len;
}
static struct rdev_sysfs_entry rdev_recovery_start =
__ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
static ssize_t bb_show(struct md_rdev *rdev, char *page)
{
return badblocks_show(&rdev->badblocks, page, 0);
}
static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
{
int rv = badblocks_store(&rdev->badblocks, page, len, 0);
if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
wake_up(&rdev->blocked_wait);
return rv;
}
static struct rdev_sysfs_entry rdev_bad_blocks =
__ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
static ssize_t ubb_show(struct md_rdev *rdev, char *page)
{
return badblocks_show(&rdev->badblocks, page, 1);
}
static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
{
return badblocks_store(&rdev->badblocks, page, len, 1);
}
static struct rdev_sysfs_entry rdev_unack_bad_blocks =
__ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
static ssize_t
ppl_sector_show(struct md_rdev *rdev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
}
static ssize_t
ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
{
unsigned long long sector;
if (kstrtoull(buf, 10, §or) < 0)
return -EINVAL;
if (sector != (sector_t)sector)
return -EINVAL;
if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
rdev->raid_disk >= 0)
return -EBUSY;
if (rdev->mddev->persistent) {
if (rdev->mddev->major_version == 0)
return -EINVAL;
if ((sector > rdev->sb_start &&
sector - rdev->sb_start > S16_MAX) ||
(sector < rdev->sb_start &&
rdev->sb_start - sector > -S16_MIN))
return -EINVAL;
rdev->ppl.offset = sector - rdev->sb_start;
} else if (!rdev->mddev->external) {
return -EBUSY;
}
rdev->ppl.sector = sector;
return len;
}
static struct rdev_sysfs_entry rdev_ppl_sector =
__ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
static ssize_t
ppl_size_show(struct md_rdev *rdev, char *page)
{
return sprintf(page, "%u\n", rdev->ppl.size);
}
static ssize_t
ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
{
unsigned int size;
if (kstrtouint(buf, 10, &size) < 0)
return -EINVAL;
if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
rdev->raid_disk >= 0)
return -EBUSY;
if (rdev->mddev->persistent) {
if (rdev->mddev->major_version == 0)
return -EINVAL;
if (size > U16_MAX)
return -EINVAL;
} else if (!rdev->mddev->external) {
return -EBUSY;
}
rdev->ppl.size = size;
return len;
}
static struct rdev_sysfs_entry rdev_ppl_size =
__ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
static struct attribute *rdev_default_attrs[] = {
&rdev_state.attr,
&rdev_errors.attr,
&rdev_slot.attr,
&rdev_offset.attr,
&rdev_new_offset.attr,
&rdev_size.attr,
&rdev_recovery_start.attr,
&rdev_bad_blocks.attr,
&rdev_unack_bad_blocks.attr,
&rdev_ppl_sector.attr,
&rdev_ppl_size.attr,
NULL,
};
ATTRIBUTE_GROUPS(rdev_default);
static ssize_t
rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
if (!entry->show)
return -EIO;
if (!rdev->mddev)
return -ENODEV;
return entry->show(rdev, page);
}
static ssize_t
rdev_attr_store(struct kobject *kobj, struct attribute *attr,
const char *page, size_t length)
{
struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
struct kernfs_node *kn = NULL;
ssize_t rv;
struct mddev *mddev = rdev->mddev;
if (!entry->store)
return -EIO;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (entry->store == state_store && cmd_match(page, "remove"))
kn = sysfs_break_active_protection(kobj, attr);
rv = mddev ? mddev_lock(mddev) : -ENODEV;
if (!rv) {
if (rdev->mddev == NULL)
rv = -ENODEV;
else
rv = entry->store(rdev, page, length);
mddev_unlock(mddev);
}
if (kn)
sysfs_unbreak_active_protection(kn);
return rv;
}
static void rdev_free(struct kobject *ko)
{
struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
kfree(rdev);
}
static const struct sysfs_ops rdev_sysfs_ops = {
.show = rdev_attr_show,
.store = rdev_attr_store,
};
static const struct kobj_type rdev_ktype = {
.release = rdev_free,
.sysfs_ops = &rdev_sysfs_ops,
.default_groups = rdev_default_groups,
};
int md_rdev_init(struct md_rdev *rdev)
{
rdev->desc_nr = -1;
rdev->saved_raid_disk = -1;
rdev->raid_disk = -1;
rdev->flags = 0;
rdev->data_offset = 0;
rdev->new_data_offset = 0;
rdev->sb_events = 0;
rdev->last_read_error = 0;
rdev->sb_loaded = 0;
rdev->bb_page = NULL;
atomic_set(&rdev->nr_pending, 0);
atomic_set(&rdev->read_errors, 0);
atomic_set(&rdev->corrected_errors, 0);
INIT_LIST_HEAD(&rdev->same_set);
init_waitqueue_head(&rdev->blocked_wait);
return badblocks_init(&rdev->badblocks, 0);
}
EXPORT_SYMBOL_GPL(md_rdev_init);
static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
{
struct md_rdev *rdev;
struct md_rdev *holder;
sector_t size;
int err;
rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
if (!rdev)
return ERR_PTR(-ENOMEM);
err = md_rdev_init(rdev);
if (err)
goto out_free_rdev;
err = alloc_disk_sb(rdev);
if (err)
goto out_clear_rdev;
if (super_format == -2) {
holder = &claim_rdev;
} else {
holder = rdev;
set_bit(Holder, &rdev->flags);
}
rdev->bdev = blkdev_get_by_dev(newdev, BLK_OPEN_READ | BLK_OPEN_WRITE,
holder, NULL);
if (IS_ERR(rdev->bdev)) {
pr_warn("md: could not open device unknown-block(%u,%u).\n",
MAJOR(newdev), MINOR(newdev));
err = PTR_ERR(rdev->bdev);
goto out_clear_rdev;
}
kobject_init(&rdev->kobj, &rdev_ktype);
size = bdev_nr_bytes(rdev->bdev) >> BLOCK_SIZE_BITS;
if (!size) {
pr_warn("md: %pg has zero or unknown size, marking faulty!\n",
rdev->bdev);
err = -EINVAL;
goto out_blkdev_put;
}
if (super_format >= 0) {
err = super_types[super_format].
load_super(rdev, NULL, super_minor);
if (err == -EINVAL) {
pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n",
rdev->bdev,
super_format, super_minor);
goto out_blkdev_put;
}
if (err < 0) {
pr_warn("md: could not read %pg's sb, not importing!\n",
rdev->bdev);
goto out_blkdev_put;
}
}
return rdev;
out_blkdev_put:
blkdev_put(rdev->bdev, holder);
out_clear_rdev:
md_rdev_clear(rdev);
out_free_rdev:
kfree(rdev);
return ERR_PTR(err);
}
static int analyze_sbs(struct mddev *mddev)
{
int i;
struct md_rdev *rdev, *freshest, *tmp;
freshest = NULL;
rdev_for_each_safe(rdev, tmp, mddev)
switch (super_types[mddev->major_version].
load_super(rdev, freshest, mddev->minor_version)) {
case 1:
freshest = rdev;
break;
case 0:
break;
default:
pr_warn("md: fatal superblock inconsistency in %pg -- removing from array\n",
rdev->bdev);
md_kick_rdev_from_array(rdev);
}
if (!freshest) {
pr_warn("md: cannot find a valid disk\n");
return -EINVAL;
}
super_types[mddev->major_version].
validate_super(mddev, freshest);
i = 0;
rdev_for_each_safe(rdev, tmp, mddev) {
if (mddev->max_disks &&
(rdev->desc_nr >= mddev->max_disks ||
i > mddev->max_disks)) {
pr_warn("md: %s: %pg: only %d devices permitted\n",
mdname(mddev), rdev->bdev,
mddev->max_disks);
md_kick_rdev_from_array(rdev);
continue;
}
if (rdev != freshest) {
if (super_types[mddev->major_version].
validate_super(mddev, rdev)) {
pr_warn("md: kicking non-fresh %pg from array!\n",
rdev->bdev);
md_kick_rdev_from_array(rdev);
continue;
}
}
if (mddev->level == LEVEL_MULTIPATH) {
rdev->desc_nr = i++;
rdev->raid_disk = rdev->desc_nr;
set_bit(In_sync, &rdev->flags);
} else if (rdev->raid_disk >=
(mddev->raid_disks - min(0, mddev->delta_disks)) &&
!test_bit(Journal, &rdev->flags)) {
rdev->raid_disk = -1;
clear_bit(In_sync, &rdev->flags);
}
}
return 0;
}
int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
{
unsigned long result = 0;
long decimals = -1;
while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
if (*cp == '.')
decimals = 0;
else if (decimals < scale) {
unsigned int value;
value = *cp - '0';
result = result * 10 + value;
if (decimals >= 0)
decimals++;
}
cp++;
}
if (*cp == '\n')
cp++;
if (*cp)
return -EINVAL;
if (decimals < 0)
decimals = 0;
*res = result * int_pow(10, scale - decimals);
return 0;
}
static ssize_t
safe_delay_show(struct mddev *mddev, char *page)
{
unsigned int msec = ((unsigned long)mddev->safemode_delay*1000)/HZ;
return sprintf(page, "%u.%03u\n", msec/1000, msec%1000);
}
static ssize_t
safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
{
unsigned long msec;
if (mddev_is_clustered(mddev)) {
pr_warn("md: Safemode is disabled for clustered mode\n");
return -EINVAL;
}
if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ)
return -EINVAL;
if (msec == 0)
mddev->safemode_delay = 0;
else {
unsigned long old_delay = mddev->safemode_delay;
unsigned long new_delay = (msec*HZ)/1000;
if (new_delay == 0)
new_delay = 1;
mddev->safemode_delay = new_delay;
if (new_delay < old_delay || old_delay == 0)
mod_timer(&mddev->safemode_timer, jiffies+1);
}
return len;
}
static struct md_sysfs_entry md_safe_delay =
__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
static ssize_t
level_show(struct mddev *mddev, char *page)
{
struct md_personality *p;
int ret;
spin_lock(&mddev->lock);
p = mddev->pers;
if (p)
ret = sprintf(page, "%s\n", p->name);
else if (mddev->clevel[0])
ret = sprintf(page, "%s\n", mddev->clevel);
else if (mddev->level != LEVEL_NONE)
ret = sprintf(page, "%d\n", mddev->level);
else
ret = 0;
spin_unlock(&mddev->lock);
return ret;
}
static ssize_t
level_store(struct mddev *mddev, const char *buf, size_t len)
{
char clevel[16];
ssize_t rv;
size_t slen = len;
struct md_personality *pers, *oldpers;
long level;
void *priv, *oldpriv;
struct md_rdev *rdev;
if (slen == 0 || slen >= sizeof(clevel))
return -EINVAL;
rv = mddev_lock(mddev);
if (rv)
return rv;
if (mddev->pers == NULL) {
strncpy(mddev->clevel, buf, slen);
if (mddev->clevel[slen-1] == '\n')
slen--;
mddev->clevel[slen] = 0;
mddev->level = LEVEL_NONE;
rv = len;
goto out_unlock;
}
rv = -EROFS;
if (!md_is_rdwr(mddev))
goto out_unlock;
rv = -EBUSY;
if (mddev->sync_thread ||
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
mddev->reshape_position != MaxSector ||
mddev->sysfs_active)
goto out_unlock;
rv = -EINVAL;
if (!mddev->pers->quiesce) {
pr_warn("md: %s: %s does not support online personality change\n",
mdname(mddev), mddev->pers->name);
goto out_unlock;
}
strncpy(clevel, buf, slen);
if (clevel[slen-1] == '\n')
slen--;
clevel[slen] = 0;
if (kstrtol(clevel, 10, &level))
level = LEVEL_NONE;
if (request_module("md-%s", clevel) != 0)
request_module("md-level-%s", clevel);
spin_lock(&pers_lock);
pers = find_pers(level, clevel);
if (!pers || !try_module_get(pers->owner)) {
spin_unlock(&pers_lock);
pr_warn("md: personality %s not loaded\n", clevel);
rv = -EINVAL;
goto out_unlock;
}
spin_unlock(&pers_lock);
if (pers == mddev->pers) {
module_put(pers->owner);
rv = len;
goto out_unlock;
}
if (!pers->takeover) {
module_put(pers->owner);
pr_warn("md: %s: %s does not support personality takeover\n",
mdname(mddev), clevel);
rv = -EINVAL;
goto out_unlock;
}
rdev_for_each(rdev, mddev)
rdev->new_raid_disk = rdev->raid_disk;
priv = pers->takeover(mddev);
if (IS_ERR(priv)) {
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->raid_disks -= mddev->delta_disks;
mddev->delta_disks = 0;
mddev->reshape_backwards = 0;
module_put(pers->owner);
pr_warn("md: %s: %s would not accept array\n",
mdname(mddev), clevel);
rv = PTR_ERR(priv);
goto out_unlock;
}
mddev_suspend(mddev);
mddev_detach(mddev);
spin_lock(&mddev->lock);
oldpers = mddev->pers;
oldpriv = mddev->private;
mddev->pers = pers;
mddev->private = priv;
strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
mddev->level = mddev->new_level;
mddev->layout = mddev->new_layout;
mddev->chunk_sectors = mddev->new_chunk_sectors;
mddev->delta_disks = 0;
mddev->reshape_backwards = 0;
mddev->degraded = 0;
spin_unlock(&mddev->lock);
if (oldpers->sync_request == NULL &&
mddev->external) {
mddev->in_sync = 0;
mddev->safemode_delay = 0;
mddev->safemode = 0;
}
oldpers->free(mddev, oldpriv);
if (oldpers->sync_request == NULL &&
pers->sync_request != NULL) {
if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
pr_warn("md: cannot register extra attributes for %s\n",
mdname(mddev));
mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
}
if (oldpers->sync_request != NULL &&
pers->sync_request == NULL) {
if (mddev->to_remove == NULL)
mddev->to_remove = &md_redundancy_group;
}
module_put(oldpers->owner);
rdev_for_each(rdev, mddev) {
if (rdev->raid_disk < 0)
continue;
if (rdev->new_raid_disk >= mddev->raid_disks)
rdev->new_raid_disk = -1;
if (rdev->new_raid_disk == rdev->raid_disk)
continue;
sysfs_unlink_rdev(mddev, rdev);
}
rdev_for_each(rdev, mddev) {
if (rdev->raid_disk < 0)
continue;
if (rdev->new_raid_disk == rdev->raid_disk)
continue;
rdev->raid_disk = rdev->new_raid_disk;
if (rdev->raid_disk < 0)
clear_bit(In_sync, &rdev->flags);
else {
if (sysfs_link_rdev(mddev, rdev))
pr_warn("md: cannot register rd%d for %s after level change\n",
rdev->raid_disk, mdname(mddev));
}
}
if (pers->sync_request == NULL) {
mddev->in_sync = 1;
del_timer_sync(&mddev->safemode_timer);
}
blk_set_stacking_limits(&mddev->queue->limits);
pers->run(mddev);
set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
mddev_resume(mddev);
if (!mddev->thread)
md_update_sb(mddev, 1);
sysfs_notify_dirent_safe(mddev->sysfs_level);
md_new_event();
rv = len;
out_unlock:
mddev_unlock(mddev);
return rv;
}
static struct md_sysfs_entry md_level =
__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
static ssize_t
layout_show(struct mddev *mddev, char *page)
{
if (mddev->reshape_position != MaxSector &&
mddev->layout != mddev->new_layout)
return sprintf(page, "%d (%d)\n",
mddev->new_layout, mddev->layout);
return sprintf(page, "%d\n", mddev->layout);
}
static ssize_t
layout_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned int n;
int err;
err = kstrtouint(buf, 10, &n);
if (err < 0)
return err;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers) {
if (mddev->pers->check_reshape == NULL)
err = -EBUSY;
else if (!md_is_rdwr(mddev))
err = -EROFS;
else {
mddev->new_layout = n;
err = mddev->pers->check_reshape(mddev);
if (err)
mddev->new_layout = mddev->layout;
}
} else {
mddev->new_layout = n;
if (mddev->reshape_position == MaxSector)
mddev->layout = n;
}
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_layout =
__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
static ssize_t
raid_disks_show(struct mddev *mddev, char *page)
{
if (mddev->raid_disks == 0)
return 0;
if (mddev->reshape_position != MaxSector &&
mddev->delta_disks != 0)
return sprintf(page, "%d (%d)\n", mddev->raid_disks,
mddev->raid_disks - mddev->delta_disks);
return sprintf(page, "%d\n", mddev->raid_disks);
}
static int update_raid_disks(struct mddev *mddev, int raid_disks);
static ssize_t
raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned int n;
int err;
err = kstrtouint(buf, 10, &n);
if (err < 0)
return err;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers)
err = update_raid_disks(mddev, n);
else if (mddev->reshape_position != MaxSector) {
struct md_rdev *rdev;
int olddisks = mddev->raid_disks - mddev->delta_disks;
err = -EINVAL;
rdev_for_each(rdev, mddev) {
if (olddisks < n &&
rdev->data_offset < rdev->new_data_offset)
goto out_unlock;
if (olddisks > n &&
rdev->data_offset > rdev->new_data_offset)
goto out_unlock;
}
err = 0;
mddev->delta_disks = n - olddisks;
mddev->raid_disks = n;
mddev->reshape_backwards = (mddev->delta_disks < 0);
} else
mddev->raid_disks = n;
out_unlock:
mddev_unlock(mddev);
return err ? err : len;
}
static struct md_sysfs_entry md_raid_disks =
__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
static ssize_t
uuid_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%pU\n", mddev->uuid);
}
static struct md_sysfs_entry md_uuid =
__ATTR(uuid, S_IRUGO, uuid_show, NULL);
static ssize_t
chunk_size_show(struct mddev *mddev, char *page)
{
if (mddev->reshape_position != MaxSector &&
mddev->chunk_sectors != mddev->new_chunk_sectors)
return sprintf(page, "%d (%d)\n",
mddev->new_chunk_sectors << 9,
mddev->chunk_sectors << 9);
return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
}
static ssize_t
chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned long n;
int err;
err = kstrtoul(buf, 10, &n);
if (err < 0)
return err;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers) {
if (mddev->pers->check_reshape == NULL)
err = -EBUSY;
else if (!md_is_rdwr(mddev))
err = -EROFS;
else {
mddev->new_chunk_sectors = n >> 9;
err = mddev->pers->check_reshape(mddev);
if (err)
mddev->new_chunk_sectors = mddev->chunk_sectors;
}
} else {
mddev->new_chunk_sectors = n >> 9;
if (mddev->reshape_position == MaxSector)
mddev->chunk_sectors = n >> 9;
}
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_chunk_size =
__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
static ssize_t
resync_start_show(struct mddev *mddev, char *page)
{
if (mddev->recovery_cp == MaxSector)
return sprintf(page, "none\n");
return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
}
static ssize_t
resync_start_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned long long n;
int err;
if (cmd_match(buf, "none"))
n = MaxSector;
else {
err = kstrtoull(buf, 10, &n);
if (err < 0)
return err;
if (n != (sector_t)n)
return -EINVAL;
}
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
err = -EBUSY;
if (!err) {
mddev->recovery_cp = n;
if (mddev->pers)
set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
}
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_resync_start =
__ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
resync_start_show, resync_start_store);
enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
write_pending, active_idle, broken, bad_word};
static char *array_states[] = {
"clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
"write-pending", "active-idle", "broken", NULL };
static int match_word(const char *word, char **list)
{
int n;
for (n=0; list[n]; n++)
if (cmd_match(word, list[n]))
break;
return n;
}
static ssize_t
array_state_show(struct mddev *mddev, char *page)
{
enum array_state st = inactive;
if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
switch(mddev->ro) {
case MD_RDONLY:
st = readonly;
break;
case MD_AUTO_READ:
st = read_auto;
break;
case MD_RDWR:
spin_lock(&mddev->lock);
if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
st = write_pending;
else if (mddev->in_sync)
st = clean;
else if (mddev->safemode)
st = active_idle;
else
st = active;
spin_unlock(&mddev->lock);
}
if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
st = broken;
} else {
if (list_empty(&mddev->disks) &&
mddev->raid_disks == 0 &&
mddev->dev_sectors == 0)
st = clear;
else
st = inactive;
}
return sprintf(page, "%s\n", array_states[st]);
}
static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
static int restart_array(struct mddev *mddev);
static ssize_t
array_state_store(struct mddev *mddev, const char *buf, size_t len)
{
int err = 0;
enum array_state st = match_word(buf, array_states);
if (mddev->pers && (st == active || st == clean) &&
mddev->ro != MD_RDONLY) {
spin_lock(&mddev->lock);
if (st == active) {
restart_array(mddev);
clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
md_wakeup_thread(mddev->thread);
wake_up(&mddev->sb_wait);
} else {
restart_array(mddev);
if (!set_in_sync(mddev))
err = -EBUSY;
}
if (!err)
sysfs_notify_dirent_safe(mddev->sysfs_state);
spin_unlock(&mddev->lock);
return err ?: len;
}
err = mddev_lock(mddev);
if (err)
return err;
err = -EINVAL;
switch(st) {
case bad_word:
break;
case clear:
err = do_md_stop(mddev, 0, NULL);
break;
case inactive:
if (mddev->pers)
err = do_md_stop(mddev, 2, NULL);
else
err = 0;
break;
case suspended:
break;
case readonly:
if (mddev->pers)
err = md_set_readonly(mddev, NULL);
else {
mddev->ro = MD_RDONLY;
set_disk_ro(mddev->gendisk, 1);
err = do_md_run(mddev);
}
break;
case read_auto:
if (mddev->pers) {
if (md_is_rdwr(mddev))
err = md_set_readonly(mddev, NULL);
else if (mddev->ro == MD_RDONLY)
err = restart_array(mddev);
if (err == 0) {
mddev->ro = MD_AUTO_READ;
set_disk_ro(mddev->gendisk, 0);
}
} else {
mddev->ro = MD_AUTO_READ;
err = do_md_run(mddev);
}
break;
case clean:
if (mddev->pers) {
err = restart_array(mddev);
if (err)
break;
spin_lock(&mddev->lock);
if (!set_in_sync(mddev))
err = -EBUSY;
spin_unlock(&mddev->lock);
} else
err = -EINVAL;
break;
case active:
if (mddev->pers) {
err = restart_array(mddev);
if (err)
break;
clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
wake_up(&mddev->sb_wait);
err = 0;
} else {
mddev->ro = MD_RDWR;
set_disk_ro(mddev->gendisk, 0);
err = do_md_run(mddev);
}
break;
case write_pending:
case active_idle:
case broken:
break;
}
if (!err) {
if (mddev->hold_active == UNTIL_IOCTL)
mddev->hold_active = 0;
sysfs_notify_dirent_safe(mddev->sysfs_state);
}
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_array_state =
__ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
static ssize_t
max_corrected_read_errors_show(struct mddev *mddev, char *page) {
return sprintf(page, "%d\n",
atomic_read(&mddev->max_corr_read_errors));
}
static ssize_t
max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned int n;
int rv;
rv = kstrtouint(buf, 10, &n);
if (rv < 0)
return rv;
if (n > INT_MAX)
return -EINVAL;
atomic_set(&mddev->max_corr_read_errors, n);
return len;
}
static struct md_sysfs_entry max_corr_read_errors =
__ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
max_corrected_read_errors_store);
static ssize_t
null_show(struct mddev *mddev, char *page)
{
return -EINVAL;
}
static ssize_t
new_dev_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
int major = simple_strtoul(buf, &e, 10);
int minor;
dev_t dev;
struct md_rdev *rdev;
int err;
if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
return -EINVAL;
minor = simple_strtoul(e+1, &e, 10);
if (*e && *e != '\n')
return -EINVAL;
dev = MKDEV(major, minor);
if (major != MAJOR(dev) ||
minor != MINOR(dev))
return -EOVERFLOW;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->persistent) {
rdev = md_import_device(dev, mddev->major_version,
mddev->minor_version);
if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
struct md_rdev *rdev0
= list_entry(mddev->disks.next,
struct md_rdev, same_set);
err = super_types[mddev->major_version]
.load_super(rdev, rdev0, mddev->minor_version);
if (err < 0)
goto out;
}
} else if (mddev->external)
rdev = md_import_device(dev, -2, -1);
else
rdev = md_import_device(dev, -1, -1);
if (IS_ERR(rdev)) {
mddev_unlock(mddev);
return PTR_ERR(rdev);
}
err = bind_rdev_to_array(rdev, mddev);
out:
if (err)
export_rdev(rdev, mddev);
mddev_unlock(mddev);
if (!err)
md_new_event();
return err ? err : len;
}
static struct md_sysfs_entry md_new_device =
__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
static ssize_t
bitmap_store(struct mddev *mddev, const char *buf, size_t len)
{
char *end;
unsigned long chunk, end_chunk;
int err;
err = mddev_lock(mddev);
if (err)
return err;
if (!mddev->bitmap)
goto out;
while (*buf) {
chunk = end_chunk = simple_strtoul(buf, &end, 0);
if (buf == end) break;
if (*end == '-') {
buf = end + 1;
end_chunk = simple_strtoul(buf, &end, 0);
if (buf == end) break;
}
if (*end && !isspace(*end)) break;
md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
buf = skip_spaces(end);
}
md_bitmap_unplug(mddev->bitmap);
out:
mddev_unlock(mddev);
return len;
}
static struct md_sysfs_entry md_bitmap =
__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
static ssize_t
size_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%llu\n",
(unsigned long long)mddev->dev_sectors / 2);
}
static int update_size(struct mddev *mddev, sector_t num_sectors);
static ssize_t
size_store(struct mddev *mddev, const char *buf, size_t len)
{
sector_t sectors;
int err = strict_blocks_to_sectors(buf, §ors);
if (err < 0)
return err;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers) {
err = update_size(mddev, sectors);
if (err == 0)
md_update_sb(mddev, 1);
} else {
if (mddev->dev_sectors == 0 ||
mddev->dev_sectors > sectors)
mddev->dev_sectors = sectors;
else
err = -ENOSPC;
}
mddev_unlock(mddev);
return err ? err : len;
}
static struct md_sysfs_entry md_size =
__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
static ssize_t
metadata_show(struct mddev *mddev, char *page)
{
if (mddev->persistent)
return sprintf(page, "%d.%d\n",
mddev->major_version, mddev->minor_version);
else if (mddev->external)
return sprintf(page, "external:%s\n", mddev->metadata_type);
else
return sprintf(page, "none\n");
}
static ssize_t
metadata_store(struct mddev *mddev, const char *buf, size_t len)
{
int major, minor;
char *e;
int err;
err = mddev_lock(mddev);
if (err)
return err;
err = -EBUSY;
if (mddev->external && strncmp(buf, "external:", 9) == 0)
;
else if (!list_empty(&mddev->disks))
goto out_unlock;
err = 0;
if (cmd_match(buf, "none")) {
mddev->persistent = 0;
mddev->external = 0;
mddev->major_version = 0;
mddev->minor_version = 90;
goto out_unlock;
}
if (strncmp(buf, "external:", 9) == 0) {
size_t namelen = len-9;
if (namelen >= sizeof(mddev->metadata_type))
namelen = sizeof(mddev->metadata_type)-1;
strncpy(mddev->metadata_type, buf+9, namelen);
mddev->metadata_type[namelen] = 0;
if (namelen && mddev->metadata_type[namelen-1] == '\n')
mddev->metadata_type[--namelen] = 0;
mddev->persistent = 0;
mddev->external = 1;
mddev->major_version = 0;
mddev->minor_version = 90;
goto out_unlock;
}
major = simple_strtoul(buf, &e, 10);
err = -EINVAL;
if (e==buf || *e != '.')
goto out_unlock;
buf = e+1;
minor = simple_strtoul(buf, &e, 10);
if (e==buf || (*e && *e != '\n') )
goto out_unlock;
err = -ENOENT;
if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
goto out_unlock;
mddev->major_version = major;
mddev->minor_version = minor;
mddev->persistent = 1;
mddev->external = 0;
err = 0;
out_unlock:
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_metadata =
__ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
static ssize_t
action_show(struct mddev *mddev, char *page)
{
char *type = "idle";
unsigned long recovery = mddev->recovery;
if (test_bit(MD_RECOVERY_FROZEN, &recovery))
type = "frozen";
else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
(md_is_rdwr(mddev) && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
type = "reshape";
else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
type = "resync";
else if (test_bit(MD_RECOVERY_CHECK, &recovery))
type = "check";
else
type = "repair";
} else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
type = "recover";
else if (mddev->reshape_position != MaxSector)
type = "reshape";
}
return sprintf(page, "%s\n", type);
}
static void stop_sync_thread(struct mddev *mddev)
{
if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return;
if (mddev_lock(mddev))
return;
if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
mddev_unlock(mddev);
return;
}
if (work_pending(&mddev->del_work))
flush_workqueue(md_misc_wq);
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_wakeup_thread_directly(mddev->sync_thread);
mddev_unlock(mddev);
}
static void idle_sync_thread(struct mddev *mddev)
{
int sync_seq = atomic_read(&mddev->sync_seq);
mutex_lock(&mddev->sync_mutex);
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
stop_sync_thread(mddev);
wait_event(resync_wait, sync_seq != atomic_read(&mddev->sync_seq) ||
!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery));
mutex_unlock(&mddev->sync_mutex);
}
static void frozen_sync_thread(struct mddev *mddev)
{
mutex_lock(&mddev->sync_mutex);
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
stop_sync_thread(mddev);
wait_event(resync_wait, mddev->sync_thread == NULL &&
!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery));
mutex_unlock(&mddev->sync_mutex);
}
static ssize_t
action_store(struct mddev *mddev, const char *page, size_t len)
{
if (!mddev->pers || !mddev->pers->sync_request)
return -EINVAL;
if (cmd_match(page, "idle"))
idle_sync_thread(mddev);
else if (cmd_match(page, "frozen"))
frozen_sync_thread(mddev);
else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return -EBUSY;
else if (cmd_match(page, "resync"))
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
else if (cmd_match(page, "recover")) {
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
} else if (cmd_match(page, "reshape")) {
int err;
if (mddev->pers->start_reshape == NULL)
return -EINVAL;
err = mddev_lock(mddev);
if (!err) {
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
err = -EBUSY;
} else if (mddev->reshape_position == MaxSector ||
mddev->pers->check_reshape == NULL ||
mddev->pers->check_reshape(mddev)) {
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
err = mddev->pers->start_reshape(mddev);
} else {
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
}
mddev_unlock(mddev);
}
if (err)
return err;
sysfs_notify_dirent_safe(mddev->sysfs_degraded);
} else {
if (cmd_match(page, "check"))
set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
else if (!cmd_match(page, "repair"))
return -EINVAL;
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
}
if (mddev->ro == MD_AUTO_READ) {
mddev->ro = MD_RDWR;
md_wakeup_thread(mddev->sync_thread);
}
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
sysfs_notify_dirent_safe(mddev->sysfs_action);
return len;
}
static struct md_sysfs_entry md_scan_mode =
__ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
static ssize_t
last_sync_action_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%s\n", mddev->last_sync_action);
}
static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
static ssize_t
mismatch_cnt_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%llu\n",
(unsigned long long)
atomic64_read(&mddev->resync_mismatches));
}
static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
static ssize_t
sync_min_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%d (%s)\n", speed_min(mddev),
mddev->sync_speed_min ? "local": "system");
}
static ssize_t
sync_min_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned int min;
int rv;
if (strncmp(buf, "system", 6)==0) {
min = 0;
} else {
rv = kstrtouint(buf, 10, &min);
if (rv < 0)
return rv;
if (min == 0)
return -EINVAL;
}
mddev->sync_speed_min = min;
return len;
}
static struct md_sysfs_entry md_sync_min =
__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
static ssize_t
sync_max_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%d (%s)\n", speed_max(mddev),
mddev->sync_speed_max ? "local": "system");
}
static ssize_t
sync_max_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned int max;
int rv;
if (strncmp(buf, "system", 6)==0) {
max = 0;
} else {
rv = kstrtouint(buf, 10, &max);
if (rv < 0)
return rv;
if (max == 0)
return -EINVAL;
}
mddev->sync_speed_max = max;
return len;
}
static struct md_sysfs_entry md_sync_max =
__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
static ssize_t
degraded_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%d\n", mddev->degraded);
}
static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
static ssize_t
sync_force_parallel_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%d\n", mddev->parallel_resync);
}
static ssize_t
sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
{
long n;
if (kstrtol(buf, 10, &n))
return -EINVAL;
if (n != 0 && n != 1)
return -EINVAL;
mddev->parallel_resync = n;
if (mddev->sync_thread)
wake_up(&resync_wait);
return len;
}
static struct md_sysfs_entry md_sync_force_parallel =
__ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
sync_force_parallel_show, sync_force_parallel_store);
static ssize_t
sync_speed_show(struct mddev *mddev, char *page)
{
unsigned long resync, dt, db;
if (mddev->curr_resync == MD_RESYNC_NONE)
return sprintf(page, "none\n");
resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
dt = (jiffies - mddev->resync_mark) / HZ;
if (!dt) dt++;
db = resync - mddev->resync_mark_cnt;
return sprintf(page, "%lu\n", db/dt/2);
}
static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
static ssize_t
sync_completed_show(struct mddev *mddev, char *page)
{
unsigned long long max_sectors, resync;
if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return sprintf(page, "none\n");
if (mddev->curr_resync == MD_RESYNC_YIELDED ||
mddev->curr_resync == MD_RESYNC_DELAYED)
return sprintf(page, "delayed\n");
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
max_sectors = mddev->resync_max_sectors;
else
max_sectors = mddev->dev_sectors;
resync = mddev->curr_resync_completed;
return sprintf(page, "%llu / %llu\n", resync, max_sectors);
}
static struct md_sysfs_entry md_sync_completed =
__ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
static ssize_t
min_sync_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%llu\n",
(unsigned long long)mddev->resync_min);
}
static ssize_t
min_sync_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned long long min;
int err;
if (kstrtoull(buf, 10, &min))
return -EINVAL;
spin_lock(&mddev->lock);
err = -EINVAL;
if (min > mddev->resync_max)
goto out_unlock;
err = -EBUSY;
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
goto out_unlock;
mddev->resync_min = round_down(min, 8);
err = 0;
out_unlock:
spin_unlock(&mddev->lock);
return err ?: len;
}
static struct md_sysfs_entry md_min_sync =
__ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
static ssize_t
max_sync_show(struct mddev *mddev, char *page)
{
if (mddev->resync_max == MaxSector)
return sprintf(page, "max\n");
else
return sprintf(page, "%llu\n",
(unsigned long long)mddev->resync_max);
}
static ssize_t
max_sync_store(struct mddev *mddev, const char *buf, size_t len)
{
int err;
spin_lock(&mddev->lock);
if (strncmp(buf, "max", 3) == 0)
mddev->resync_max = MaxSector;
else {
unsigned long long max;
int chunk;
err = -EINVAL;
if (kstrtoull(buf, 10, &max))
goto out_unlock;
if (max < mddev->resync_min)
goto out_unlock;
err = -EBUSY;
if (max < mddev->resync_max && md_is_rdwr(mddev) &&
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
goto out_unlock;
chunk = mddev->chunk_sectors;
if (chunk) {
sector_t temp = max;
err = -EINVAL;
if (sector_div(temp, chunk))
goto out_unlock;
}
mddev->resync_max = max;
}
wake_up(&mddev->recovery_wait);
err = 0;
out_unlock:
spin_unlock(&mddev->lock);
return err ?: len;
}
static struct md_sysfs_entry md_max_sync =
__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
static ssize_t
suspend_lo_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
}
static ssize_t
suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned long long new;
int err;
err = kstrtoull(buf, 10, &new);
if (err < 0)
return err;
if (new != (sector_t)new)
return -EINVAL;
err = mddev_lock(mddev);
if (err)
return err;
err = -EINVAL;
if (mddev->pers == NULL ||
mddev->pers->quiesce == NULL)
goto unlock;
mddev_suspend(mddev);
mddev->suspend_lo = new;
mddev_resume(mddev);
err = 0;
unlock:
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_suspend_lo =
__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
static ssize_t
suspend_hi_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
}
static ssize_t
suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned long long new;
int err;
err = kstrtoull(buf, 10, &new);
if (err < 0)
return err;
if (new != (sector_t)new)
return -EINVAL;
err = mddev_lock(mddev);
if (err)
return err;
err = -EINVAL;
if (mddev->pers == NULL)
goto unlock;
mddev_suspend(mddev);
mddev->suspend_hi = new;
mddev_resume(mddev);
err = 0;
unlock:
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_suspend_hi =
__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
static ssize_t
reshape_position_show(struct mddev *mddev, char *page)
{
if (mddev->reshape_position != MaxSector)
return sprintf(page, "%llu\n",
(unsigned long long)mddev->reshape_position);
strcpy(page, "none\n");
return 5;
}
static ssize_t
reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
{
struct md_rdev *rdev;
unsigned long long new;
int err;
err = kstrtoull(buf, 10, &new);
if (err < 0)
return err;
if (new != (sector_t)new)
return -EINVAL;
err = mddev_lock(mddev);
if (err)
return err;
err = -EBUSY;
if (mddev->pers)
goto unlock;
mddev->reshape_position = new;
mddev->delta_disks = 0;
mddev->reshape_backwards = 0;
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
mddev->new_chunk_sectors = mddev->chunk_sectors;
rdev_for_each(rdev, mddev)
rdev->new_data_offset = rdev->data_offset;
err = 0;
unlock:
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_reshape_position =
__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
reshape_position_store);
static ssize_t
reshape_direction_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%s\n",
mddev->reshape_backwards ? "backwards" : "forwards");
}
static ssize_t
reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
{
int backwards = 0;
int err;
if (cmd_match(buf, "forwards"))
backwards = 0;
else if (cmd_match(buf, "backwards"))
backwards = 1;
else
return -EINVAL;
if (mddev->reshape_backwards == backwards)
return len;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->delta_disks)
err = -EBUSY;
else if (mddev->persistent &&
mddev->major_version == 0)
err = -EINVAL;
else
mddev->reshape_backwards = backwards;
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_reshape_direction =
__ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
reshape_direction_store);
static ssize_t
array_size_show(struct mddev *mddev, char *page)
{
if (mddev->external_size)
return sprintf(page, "%llu\n",
(unsigned long long)mddev->array_sectors/2);
else
return sprintf(page, "default\n");
}
static ssize_t
array_size_store(struct mddev *mddev, const char *buf, size_t len)
{
sector_t sectors;
int err;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev_is_clustered(mddev)) {
mddev_unlock(mddev);
return -EINVAL;
}
if (strncmp(buf, "default", 7) == 0) {
if (mddev->pers)
sectors = mddev->pers->size(mddev, 0, 0);
else
sectors = mddev->array_sectors;
mddev->external_size = 0;
} else {
if (strict_blocks_to_sectors(buf, §ors) < 0)
err = -EINVAL;
else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
err = -E2BIG;
else
mddev->external_size = 1;
}
if (!err) {
mddev->array_sectors = sectors;
if (mddev->pers)
set_capacity_and_notify(mddev->gendisk,
mddev->array_sectors);
}
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_array_size =
__ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
array_size_store);
static ssize_t
consistency_policy_show(struct mddev *mddev, char *page)
{
int ret;
if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
ret = sprintf(page, "journal\n");
} else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
ret = sprintf(page, "ppl\n");
} else if (mddev->bitmap) {
ret = sprintf(page, "bitmap\n");
} else if (mddev->pers) {
if (mddev->pers->sync_request)
ret = sprintf(page, "resync\n");
else
ret = sprintf(page, "none\n");
} else {
ret = sprintf(page, "unknown\n");
}
return ret;
}
static ssize_t
consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
{
int err = 0;
if (mddev->pers) {
if (mddev->pers->change_consistency_policy)
err = mddev->pers->change_consistency_policy(mddev, buf);
else
err = -EBUSY;
} else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
set_bit(MD_HAS_PPL, &mddev->flags);
} else {
err = -EINVAL;
}
return err ? err : len;
}
static struct md_sysfs_entry md_consistency_policy =
__ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
consistency_policy_store);
static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%d\n", mddev->fail_last_dev);
}
static ssize_t
fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
{
int ret;
bool value;
ret = kstrtobool(buf, &value);
if (ret)
return ret;
if (value != mddev->fail_last_dev)
mddev->fail_last_dev = value;
return len;
}
static struct md_sysfs_entry md_fail_last_dev =
__ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
fail_last_dev_store);
static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
{
if (mddev->pers == NULL || (mddev->pers->level != 1))
return sprintf(page, "n/a\n");
else
return sprintf(page, "%d\n", mddev->serialize_policy);
}
static ssize_t
serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
{
int err;
bool value;
err = kstrtobool(buf, &value);
if (err)
return err;
if (value == mddev->serialize_policy)
return len;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers == NULL || (mddev->pers->level != 1)) {
pr_err("md: serialize_policy is only effective for raid1\n");
err = -EINVAL;
goto unlock;
}
mddev_suspend(mddev);
if (value)
mddev_create_serial_pool(mddev, NULL, true);
else
mddev_destroy_serial_pool(mddev, NULL, true);
mddev->serialize_policy = value;
mddev_resume(mddev);
unlock:
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_serialize_policy =
__ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
serialize_policy_store);
static struct attribute *md_default_attrs[] = {
&md_level.attr,
&md_layout.attr,
&md_raid_disks.attr,
&md_uuid.attr,
&md_chunk_size.attr,
&md_size.attr,
&md_resync_start.attr,
&md_metadata.attr,
&md_new_device.attr,
&md_safe_delay.attr,
&md_array_state.attr,
&md_reshape_position.attr,
&md_reshape_direction.attr,
&md_array_size.attr,
&max_corr_read_errors.attr,
&md_consistency_policy.attr,
&md_fail_last_dev.attr,
&md_serialize_policy.attr,
NULL,
};
static const struct attribute_group md_default_group = {
.attrs = md_default_attrs,
};
static struct attribute *md_redundancy_attrs[] = {
&md_scan_mode.attr,
&md_last_scan_mode.attr,
&md_mismatches.attr,
&md_sync_min.attr,
&md_sync_max.attr,
&md_sync_speed.attr,
&md_sync_force_parallel.attr,
&md_sync_completed.attr,
&md_min_sync.attr,
&md_max_sync.attr,
&md_suspend_lo.attr,
&md_suspend_hi.attr,
&md_bitmap.attr,
&md_degraded.attr,
NULL,
};
static const struct attribute_group md_redundancy_group = {
.name = NULL,
.attrs = md_redundancy_attrs,
};
static const struct attribute_group *md_attr_groups[] = {
&md_default_group,
&md_bitmap_group,
NULL,
};
static ssize_t
md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
struct mddev *mddev = container_of(kobj, struct mddev, kobj);
ssize_t rv;
if (!entry->show)
return -EIO;
spin_lock(&all_mddevs_lock);
if (!mddev_get(mddev)) {
spin_unlock(&all_mddevs_lock);
return -EBUSY;
}
spin_unlock(&all_mddevs_lock);
rv = entry->show(mddev, page);
mddev_put(mddev);
return rv;
}
static ssize_t
md_attr_store(struct kobject *kobj, struct attribute *attr,
const char *page, size_t length)
{
struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
struct mddev *mddev = container_of(kobj, struct mddev, kobj);
ssize_t rv;
if (!entry->store)
return -EIO;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
spin_lock(&all_mddevs_lock);
if (!mddev_get(mddev)) {
spin_unlock(&all_mddevs_lock);
return -EBUSY;
}
spin_unlock(&all_mddevs_lock);
rv = entry->store(mddev, page, length);
mddev_put(mddev);
return rv;
}
static void md_kobj_release(struct kobject *ko)
{
struct mddev *mddev = container_of(ko, struct mddev, kobj);
if (mddev->sysfs_state)
sysfs_put(mddev->sysfs_state);
if (mddev->sysfs_level)
sysfs_put(mddev->sysfs_level);
del_gendisk(mddev->gendisk);
put_disk(mddev->gendisk);
}
static const struct sysfs_ops md_sysfs_ops = {
.show = md_attr_show,
.store = md_attr_store,
};
static const struct kobj_type md_ktype = {
.release = md_kobj_release,
.sysfs_ops = &md_sysfs_ops,
.default_groups = md_attr_groups,
};
int mdp_major = 0;
static void mddev_delayed_delete(struct work_struct *ws)
{
struct mddev *mddev = container_of(ws, struct mddev, del_work);
kobject_put(&mddev->kobj);
}
static void no_op(struct percpu_ref *r) {}
int mddev_init_writes_pending(struct mddev *mddev)
{
if (mddev->writes_pending.percpu_count_ptr)
return 0;
if (percpu_ref_init(&mddev->writes_pending, no_op,
PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
return -ENOMEM;
percpu_ref_put(&mddev->writes_pending);
return 0;
}
EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
struct mddev *md_alloc(dev_t dev, char *name)
{
static DEFINE_MUTEX(disks_mutex);
struct mddev *mddev;
struct gendisk *disk;
int partitioned;
int shift;
int unit;
int error ;
flush_workqueue(md_misc_wq);
mutex_lock(&disks_mutex);
mddev = mddev_alloc(dev);
if (IS_ERR(mddev)) {
error = PTR_ERR(mddev);
goto out_unlock;
}
partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
shift = partitioned ? MdpMinorShift : 0;
unit = MINOR(mddev->unit) >> shift;
if (name && !dev) {
struct mddev *mddev2;
spin_lock(&all_mddevs_lock);
list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
if (mddev2->gendisk &&
strcmp(mddev2->gendisk->disk_name, name) == 0) {
spin_unlock(&all_mddevs_lock);
error = -EEXIST;
goto out_free_mddev;
}
spin_unlock(&all_mddevs_lock);
}
if (name && dev)
mddev->hold_active = UNTIL_STOP;
error = -ENOMEM;
disk = blk_alloc_disk(NUMA_NO_NODE);
if (!disk)
goto out_free_mddev;
disk->major = MAJOR(mddev->unit);
disk->first_minor = unit << shift;
disk->minors = 1 << shift;
if (name)
strcpy(disk->disk_name, name);
else if (partitioned)
sprintf(disk->disk_name, "md_d%d", unit);
else
sprintf(disk->disk_name, "md%d", unit);
disk->fops = &md_fops;
disk->private_data = mddev;
mddev->queue = disk->queue;
blk_set_stacking_limits(&mddev->queue->limits);
blk_queue_write_cache(mddev->queue, true, true);
disk->events |= DISK_EVENT_MEDIA_CHANGE;
mddev->gendisk = disk;
error = add_disk(disk);
if (error)
goto out_put_disk;
kobject_init(&mddev->kobj, &md_ktype);
error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
if (error) {
mddev->hold_active = 0;
mutex_unlock(&disks_mutex);
mddev_put(mddev);
return ERR_PTR(error);
}
kobject_uevent(&mddev->kobj, KOBJ_ADD);
mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
mutex_unlock(&disks_mutex);
return mddev;
out_put_disk:
put_disk(disk);
out_free_mddev:
mddev_free(mddev);
out_unlock:
mutex_unlock(&disks_mutex);
return ERR_PTR(error);
}
static int md_alloc_and_put(dev_t dev, char *name)
{
struct mddev *mddev = md_alloc(dev, name);
if (IS_ERR(mddev))
return PTR_ERR(mddev);
mddev_put(mddev);
return 0;
}
static void md_probe(dev_t dev)
{
if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
return;
if (create_on_open)
md_alloc_and_put(dev, NULL);
}
static int add_named_array(const char *val, const struct kernel_param *kp)
{
int len = strlen(val);
char buf[DISK_NAME_LEN];
unsigned long devnum;
while (len && val[len-1] == '\n')
len--;
if (len >= DISK_NAME_LEN)
return -E2BIG;
strscpy(buf, val, len+1);
if (strncmp(buf, "md_", 3) == 0)
return md_alloc_and_put(0, buf);
if (strncmp(buf, "md", 2) == 0 &&
isdigit(buf[2]) &&
kstrtoul(buf+2, 10, &devnum) == 0 &&
devnum <= MINORMASK)
return md_alloc_and_put(MKDEV(MD_MAJOR, devnum), NULL);
return -EINVAL;
}
static void md_safemode_timeout(struct timer_list *t)
{
struct mddev *mddev = from_timer(mddev, t, safemode_timer);
mddev->safemode = 1;
if (mddev->external)
sysfs_notify_dirent_safe(mddev->sysfs_state);
md_wakeup_thread(mddev->thread);
}
static int start_dirty_degraded;
static void active_io_release(struct percpu_ref *ref)
{
struct mddev *mddev = container_of(ref, struct mddev, active_io);
wake_up(&mddev->sb_wait);
}
int md_run(struct mddev *mddev)
{
int err;
struct md_rdev *rdev;
struct md_personality *pers;
bool nowait = true;
if (list_empty(&mddev->disks))
return -EINVAL;
if (mddev->pers)
return -EBUSY;
if (mddev->sysfs_active)
return -EBUSY;
if (!mddev->raid_disks) {
if (!mddev->persistent)
return -EINVAL;
err = analyze_sbs(mddev);
if (err)
return -EINVAL;
}
if (mddev->level != LEVEL_NONE)
request_module("md-level-%d", mddev->level);
else if (mddev->clevel[0])
request_module("md-%s", mddev->clevel);
mddev->has_superblocks = false;
rdev_for_each(rdev, mddev) {
if (test_bit(Faulty, &rdev->flags))
continue;
sync_blockdev(rdev->bdev);
invalidate_bdev(rdev->bdev);
if (mddev->ro != MD_RDONLY && rdev_read_only(rdev)) {
mddev->ro = MD_RDONLY;
if (mddev->gendisk)
set_disk_ro(mddev->gendisk, 1);
}
if (rdev->sb_page)
mddev->has_superblocks = true;
if (rdev->meta_bdev) {
;
} else if (rdev->data_offset < rdev->sb_start) {
if (mddev->dev_sectors &&
rdev->data_offset + mddev->dev_sectors
> rdev->sb_start) {
pr_warn("md: %s: data overlaps metadata\n",
mdname(mddev));
return -EINVAL;
}
} else {
if (rdev->sb_start + rdev->sb_size/512
> rdev->data_offset) {
pr_warn("md: %s: metadata overlaps data\n",
mdname(mddev));
return -EINVAL;
}
}
sysfs_notify_dirent_safe(rdev->sysfs_state);
nowait = nowait && bdev_nowait(rdev->bdev);
}
err = percpu_ref_init(&mddev->active_io, active_io_release,
PERCPU_REF_ALLOW_REINIT, GFP_KERNEL);
if (err)
return err;
if (!bioset_initialized(&mddev->bio_set)) {
err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
if (err)
goto exit_active_io;
}
if (!bioset_initialized(&mddev->sync_set)) {
err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
if (err)
goto exit_bio_set;
}
if (!bioset_initialized(&mddev->io_clone_set)) {
err = bioset_init(&mddev->io_clone_set, BIO_POOL_SIZE,
offsetof(struct md_io_clone, bio_clone), 0);
if (err)
goto exit_sync_set;
}
spin_lock(&pers_lock);
pers = find_pers(mddev->level, mddev->clevel);
if (!pers || !try_module_get(pers->owner)) {
spin_unlock(&pers_lock);
if (mddev->level != LEVEL_NONE)
pr_warn("md: personality for level %d is not loaded!\n",
mddev->level);
else
pr_warn("md: personality for level %s is not loaded!\n",
mddev->clevel);
err = -EINVAL;
goto abort;
}
spin_unlock(&pers_lock);
if (mddev->level != pers->level) {
mddev->level = pers->level;
mddev->new_level = pers->level;
}
strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
if (mddev->reshape_position != MaxSector &&
pers->start_reshape == NULL) {
module_put(pers->owner);
err = -EINVAL;
goto abort;
}
if (pers->sync_request) {
struct md_rdev *rdev2;
int warned = 0;
rdev_for_each(rdev, mddev)
rdev_for_each(rdev2, mddev) {
if (rdev < rdev2 &&
rdev->bdev->bd_disk ==
rdev2->bdev->bd_disk) {
pr_warn("%s: WARNING: %pg appears to be on the same physical disk as %pg.\n",
mdname(mddev),
rdev->bdev,
rdev2->bdev);
warned = 1;
}
}
if (warned)
pr_warn("True protection against single-disk failure might be compromised.\n");
}
mddev->recovery = 0;
mddev->resync_max_sectors = mddev->dev_sectors;
mddev->ok_start_degraded = start_dirty_degraded;
if (start_readonly && md_is_rdwr(mddev))
mddev->ro = MD_AUTO_READ;
err = pers->run(mddev);
if (err)
pr_warn("md: pers->run() failed ...\n");
else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
WARN_ONCE(!mddev->external_size,
"%s: default size too small, but 'external_size' not in effect?\n",
__func__);
pr_warn("md: invalid array_size %llu > default size %llu\n",
(unsigned long long)mddev->array_sectors / 2,
(unsigned long long)pers->size(mddev, 0, 0) / 2);
err = -EINVAL;
}
if (err == 0 && pers->sync_request &&
(mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
struct bitmap *bitmap;
bitmap = md_bitmap_create(mddev, -1);
if (IS_ERR(bitmap)) {
err = PTR_ERR(bitmap);
pr_warn("%s: failed to create bitmap (%d)\n",
mdname(mddev), err);
} else
mddev->bitmap = bitmap;
}
if (err)
goto bitmap_abort;
if (mddev->bitmap_info.max_write_behind > 0) {
bool create_pool = false;
rdev_for_each(rdev, mddev) {
if (test_bit(WriteMostly, &rdev->flags) &&
rdev_init_serial(rdev))
create_pool = true;
}
if (create_pool && mddev->serial_info_pool == NULL) {
mddev->serial_info_pool =
mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
sizeof(struct serial_info));
if (!mddev->serial_info_pool) {
err = -ENOMEM;
goto bitmap_abort;
}
}
}
if (mddev->queue) {
bool nonrot = true;
rdev_for_each(rdev, mddev) {
if (rdev->raid_disk >= 0 && !bdev_nonrot(rdev->bdev)) {
nonrot = false;
break;
}
}
if (mddev->degraded)
nonrot = false;
if (nonrot)
blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
else
blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
if (nowait)
blk_queue_flag_set(QUEUE_FLAG_NOWAIT, mddev->queue);
}
if (pers->sync_request) {
if (mddev->kobj.sd &&
sysfs_create_group(&mddev->kobj, &md_redundancy_group))
pr_warn("md: cannot register extra attributes for %s\n",
mdname(mddev));
mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
} else if (mddev->ro == MD_AUTO_READ)
mddev->ro = MD_RDWR;
atomic_set(&mddev->max_corr_read_errors,
MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
mddev->safemode = 0;
if (mddev_is_clustered(mddev))
mddev->safemode_delay = 0;
else
mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
mddev->in_sync = 1;
smp_wmb();
spin_lock(&mddev->lock);
mddev->pers = pers;
spin_unlock(&mddev->lock);
rdev_for_each(rdev, mddev)
if (rdev->raid_disk >= 0)
sysfs_link_rdev(mddev, rdev);
if (mddev->degraded && md_is_rdwr(mddev))
set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
if (mddev->sb_flags)
md_update_sb(mddev, 0);
md_new_event();
return 0;
bitmap_abort:
mddev_detach(mddev);
if (mddev->private)
pers->free(mddev, mddev->private);
mddev->private = NULL;
module_put(pers->owner);
md_bitmap_destroy(mddev);
abort:
bioset_exit(&mddev->io_clone_set);
exit_sync_set:
bioset_exit(&mddev->sync_set);
exit_bio_set:
bioset_exit(&mddev->bio_set);
exit_active_io:
percpu_ref_exit(&mddev->active_io);
return err;
}
EXPORT_SYMBOL_GPL(md_run);
int do_md_run(struct mddev *mddev)
{
int err;
set_bit(MD_NOT_READY, &mddev->flags);
err = md_run(mddev);
if (err)
goto out;
err = md_bitmap_load(mddev);
if (err) {
md_bitmap_destroy(mddev);
goto out;
}
if (mddev_is_clustered(mddev))
md_allow_write(mddev);
md_start(mddev);
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread);
set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
clear_bit(MD_NOT_READY, &mddev->flags);
mddev->changed = 1;
kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
sysfs_notify_dirent_safe(mddev->sysfs_state);
sysfs_notify_dirent_safe(mddev->sysfs_action);
sysfs_notify_dirent_safe(mddev->sysfs_degraded);
out:
clear_bit(MD_NOT_READY, &mddev->flags);
return err;
}
int md_start(struct mddev *mddev)
{
int ret = 0;
if (mddev->pers->start) {
set_bit(MD_RECOVERY_WAIT, &