diff options
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 4127 |
1 files changed, 2492 insertions, 1635 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 02b0240e7c71..e5922a682953 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -65,45 +65,41 @@ #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" -/* pers_list is a list of registered personalities protected - * by pers_lock. - * pers_lock does extra service to protect accesses to - * mddev->thread when the mutex cannot be held. - */ -static LIST_HEAD(pers_list); -static DEFINE_SPINLOCK(pers_lock); +static const char *action_name[NR_SYNC_ACTIONS] = { + [ACTION_RESYNC] = "resync", + [ACTION_RECOVER] = "recover", + [ACTION_CHECK] = "check", + [ACTION_REPAIR] = "repair", + [ACTION_RESHAPE] = "reshape", + [ACTION_FROZEN] = "frozen", + [ACTION_IDLE] = "idle", +}; -static struct kobj_type md_ktype; +static DEFINE_XARRAY(md_submodule); -struct md_cluster_operations *md_cluster_ops; -EXPORT_SYMBOL(md_cluster_ops); -static struct module *md_cluster_mod; +static const struct kobj_type md_ktype; static DECLARE_WAIT_QUEUE_HEAD(resync_wait); static struct workqueue_struct *md_wq; + +/* + * This workqueue is used for sync_work to register new sync_thread, and for + * del_work to remove rdev, and for event_work that is only set by dm-raid. + * + * Noted that sync_work will grab reconfig_mutex, hence never flush this + * workqueue whith reconfig_mutex grabbed. + */ static struct workqueue_struct *md_misc_wq; -static struct workqueue_struct *md_rdev_misc_wq; static int remove_and_add_spares(struct mddev *mddev, struct md_rdev *this); static void mddev_detach(struct mddev *mddev); - -enum md_ro_state { - MD_RDWR, - MD_RDONLY, - MD_AUTO_READ, - MD_MAX_STATE -}; - -static bool md_is_rdwr(struct mddev *mddev) -{ - return (mddev->ro == MD_RDWR); -} +static void export_rdev(struct md_rdev *rdev, struct mddev *mddev); +static void md_wakeup_thread_directly(struct md_thread __rcu **thread); /* * Default number of read corrections we'll attempt on an rdev @@ -114,32 +110,48 @@ static bool md_is_rdwr(struct mddev *mddev) /* Default safemode delay: 200 msec */ #define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1) /* - * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' - * is 1000 KB/sec, so the extra system load does not show up that much. - * Increase it if you want to have more _guaranteed_ speed. Note that - * the RAID driver will use the maximum available bandwidth if the IO - * subsystem is idle. There is also an 'absolute maximum' reconstruction - * speed limit - in case reconstruction slows down your system despite - * idle IO detection. + * Current RAID-1,4,5,6,10 parallel reconstruction 'guaranteed speed limit' + * is sysctl_speed_limit_min, 1000 KB/sec by default, so the extra system load + * does not show up that much. Increase it if you want to have more guaranteed + * speed. Note that the RAID driver will use the maximum bandwidth + * sysctl_speed_limit_max, 200 MB/sec by default, if the IO subsystem is idle. + * + * Background sync IO speed control: + * + * - below speed min: + * no limit; + * - above speed min and below speed max: + * a) if mddev is idle, then no limit; + * b) if mddev is busy handling normal IO, then limit inflight sync IO + * to sync_io_depth; + * - above speed max: + * sync IO can't be issued; * - * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. - * or /sys/block/mdX/md/sync_speed_{min,max} + * Following configurations can be changed via /proc/sys/dev/raid/ for system + * or /sys/block/mdX/md/ for one array. */ - static int sysctl_speed_limit_min = 1000; static int sysctl_speed_limit_max = 200000; -static inline int speed_min(struct mddev *mddev) +static int sysctl_sync_io_depth = 32; + +static 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) +static int speed_max(struct mddev *mddev) { return mddev->sync_speed_max ? mddev->sync_speed_max : sysctl_speed_limit_max; } +static int sync_io_depth(struct mddev *mddev) +{ + return mddev->sync_io_depth ? + mddev->sync_io_depth : sysctl_sync_io_depth; +} + static void rdev_uninit_serial(struct md_rdev *rdev) { if (!test_and_clear_bit(CollisionCheck, &rdev->flags)) @@ -220,8 +232,7 @@ static int rdev_need_serial(struct md_rdev *rdev) * 1. rdev is the first device which return true from rdev_enable_serial. * 2. rdev is NULL, means we want to enable serialization for all rdevs. */ -void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev, - bool is_suspend) +void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev) { int ret = 0; @@ -229,15 +240,12 @@ void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *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; + return; if (mddev->serial_info_pool == NULL) { /* @@ -252,10 +260,6 @@ void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev, pr_err("can't alloc memory pool for serialization\n"); } } - -abort: - if (!is_suspend) - mddev_resume(mddev); } /* @@ -264,8 +268,7 @@ abort: * 2. when bitmap is destroyed while policy is not enabled. * 3. for disable policy, the pool is destroyed only when no rdev needs it. */ -void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev, - bool is_suspend) +void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev) { if (rdev && !test_bit(CollisionCheck, &rdev->flags)) return; @@ -274,8 +277,6 @@ void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev, struct md_rdev *temp; int num = 0; /* used to track if other rdevs need the pool */ - if (!is_suspend) - mddev_suspend(mddev); rdev_for_each(temp, mddev) { if (!rdev) { if (!mddev->serialize_policy || @@ -297,49 +298,33 @@ void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev, 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[] = { +static const struct ctl_table raid_table[] = { { .procname = "speed_limit_min", .data = &sysctl_speed_limit_min, .maxlen = sizeof(int), - .mode = S_IRUGO|S_IWUSR, + .mode = 0644, .proc_handler = proc_dointvec, }, { .procname = "speed_limit_max", .data = &sysctl_speed_limit_max, .maxlen = sizeof(int), - .mode = S_IRUGO|S_IWUSR, + .mode = 0644, .proc_handler = proc_dointvec, }, - { } -}; - -static struct ctl_table raid_dir_table[] = { - { - .procname = "raid", - .maxlen = 0, - .mode = S_IRUGO|S_IXUGO, - .child = raid_table, - }, - { } -}; - -static struct ctl_table raid_root_table[] = { { - .procname = "dev", - .maxlen = 0, - .mode = 0555, - .child = raid_dir_table, + .procname = "sync_io_depth", + .data = &sysctl_sync_io_depth, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, }, - { } }; static int start_readonly; @@ -353,6 +338,8 @@ static int start_readonly; * so all the races disappear. */ static bool create_on_open = true; +static bool legacy_async_del_gendisk = true; +static bool check_new_feature = true; /* * We have a system wide 'event count' that is incremented @@ -380,6 +367,10 @@ EXPORT_SYMBOL_GPL(md_new_event); static LIST_HEAD(all_mddevs); static DEFINE_SPINLOCK(all_mddevs_lock); +static bool is_md_suspended(struct mddev *mddev) +{ + return percpu_ref_is_dying(&mddev->active_io); +} /* Rather than calling directly into the personality make_request function, * IO requests come here first so that we can check if the device is * being suspended pending a reconfiguration. @@ -389,53 +380,50 @@ static DEFINE_SPINLOCK(all_mddevs_lock); */ static bool is_suspended(struct mddev *mddev, struct bio *bio) { - if (mddev->suspended) + if (is_md_suspended(mddev)) return true; if (bio_data_dir(bio) != WRITE) return false; - if (mddev->suspend_lo >= mddev->suspend_hi) + if (READ_ONCE(mddev->suspend_lo) >= READ_ONCE(mddev->suspend_hi)) return false; - if (bio->bi_iter.bi_sector >= mddev->suspend_hi) + if (bio->bi_iter.bi_sector >= READ_ONCE(mddev->suspend_hi)) return false; - if (bio_end_sector(bio) < mddev->suspend_lo) + if (bio_end_sector(bio) < READ_ONCE(mddev->suspend_lo)) return false; return true; } -void md_handle_request(struct mddev *mddev, struct bio *bio) +bool md_handle_request(struct mddev *mddev, struct bio *bio) { check_suspended: - rcu_read_lock(); if (is_suspended(mddev, bio)) { DEFINE_WAIT(__wait); /* Bail out if REQ_NOWAIT is set for the bio */ if (bio->bi_opf & REQ_NOWAIT) { - rcu_read_unlock(); bio_wouldblock_error(bio); - return; + return true; } for (;;) { prepare_to_wait(&mddev->sb_wait, &__wait, TASK_UNINTERRUPTIBLE); if (!is_suspended(mddev, bio)) break; - rcu_read_unlock(); schedule(); - rcu_read_lock(); } finish_wait(&mddev->sb_wait, &__wait); } - atomic_inc(&mddev->active_io); - rcu_read_unlock(); + if (!percpu_ref_tryget_live(&mddev->active_io)) + goto check_suspended; if (!mddev->pers->make_request(mddev, bio)) { - atomic_dec(&mddev->active_io); - wake_up(&mddev->sb_wait); + percpu_ref_put(&mddev->active_io); + if (!mddev->gendisk && mddev->pers->prepare_suspend) + return false; goto check_suspended; } - if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) - wake_up(&mddev->sb_wait); + percpu_ref_put(&mddev->active_io); + return true; } EXPORT_SYMBOL(md_handle_request); @@ -471,170 +459,163 @@ static void md_submit_bio(struct bio *bio) md_handle_request(mddev, bio); } -/* mddev_suspend makes sure no new requests are submitted - * to the device, and that any requests that have been submitted - * are completely handled. - * Once mddev_detach() is called and completes, the module will be - * completely unused. +/* + * Make sure no new requests are submitted to the device, and any requests that + * have been submitted are completely handled. */ -void mddev_suspend(struct mddev *mddev) +int mddev_suspend(struct mddev *mddev, bool interruptible) { - WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk); - lockdep_assert_held(&mddev->reconfig_mutex); - if (mddev->suspended++) - return; - synchronize_rcu(); - wake_up(&mddev->sb_wait); - set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags); - smp_mb__after_atomic(); - wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); - mddev->pers->quiesce(mddev, 1); - 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); + int err = 0; + + /* + * hold reconfig_mutex to wait for normal io will deadlock, because + * other context can't update super_block, and normal io can rely on + * updating super_block. + */ + lockdep_assert_not_held(&mddev->reconfig_mutex); + + if (interruptible) + err = mutex_lock_interruptible(&mddev->suspend_mutex); + else + mutex_lock(&mddev->suspend_mutex); + if (err) + return err; + + if (mddev->suspended) { + WRITE_ONCE(mddev->suspended, mddev->suspended + 1); + mutex_unlock(&mddev->suspend_mutex); + return 0; + } + + percpu_ref_kill(&mddev->active_io); + if (interruptible) + err = wait_event_interruptible(mddev->sb_wait, + percpu_ref_is_zero(&mddev->active_io)); + else + wait_event(mddev->sb_wait, + percpu_ref_is_zero(&mddev->active_io)); + if (err) { + percpu_ref_resurrect(&mddev->active_io); + mutex_unlock(&mddev->suspend_mutex); + return err; + } + + /* + * For raid456, io might be waiting for reshape to make progress, + * allow new reshape to start while waiting for io to be done to + * prevent deadlock. + */ + WRITE_ONCE(mddev->suspended, mddev->suspended + 1); + /* restrict memory reclaim I/O during raid array is suspend */ mddev->noio_flag = memalloc_noio_save(); + + mutex_unlock(&mddev->suspend_mutex); + return 0; } EXPORT_SYMBOL_GPL(mddev_suspend); -void mddev_resume(struct mddev *mddev) +static void __mddev_resume(struct mddev *mddev, bool recovery_needed) { + lockdep_assert_not_held(&mddev->reconfig_mutex); + + mutex_lock(&mddev->suspend_mutex); + WRITE_ONCE(mddev->suspended, mddev->suspended - 1); + if (mddev->suspended) { + mutex_unlock(&mddev->suspend_mutex); + return; + } + /* entred the memalloc scope from mddev_suspend() */ memalloc_noio_restore(mddev->noio_flag); - lockdep_assert_held(&mddev->reconfig_mutex); - if (--mddev->suspended) - return; + + percpu_ref_resurrect(&mddev->active_io); wake_up(&mddev->sb_wait); - mddev->pers->quiesce(mddev, 0); - set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + if (recovery_needed) + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); md_wakeup_thread(mddev->thread); md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ -} -EXPORT_SYMBOL_GPL(mddev_resume); -/* - * Generic flush handling for md - */ + mutex_unlock(&mddev->suspend_mutex); +} -static void md_end_flush(struct bio *bio) +void mddev_resume(struct mddev *mddev) { - 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)) { - /* The pre-request flush has finished */ - queue_work(md_wq, &mddev->flush_work); - } + return __mddev_resume(mddev, true); } +EXPORT_SYMBOL_GPL(mddev_resume); -static void md_submit_flush_data(struct work_struct *ws); - -static void submit_flushes(struct work_struct *ws) +/* sync bdev before setting device to readonly or stopping raid*/ +static int mddev_set_closing_and_sync_blockdev(struct mddev *mddev, int opener_num) { - struct mddev *mddev = container_of(ws, struct mddev, flush_work); - struct md_rdev *rdev; + mutex_lock(&mddev->open_mutex); + if (mddev->pers && atomic_read(&mddev->openers) > opener_num) { + mutex_unlock(&mddev->open_mutex); + return -EBUSY; + } + if (test_and_set_bit(MD_CLOSING, &mddev->flags)) { + mutex_unlock(&mddev->open_mutex); + return -EBUSY; + } + mutex_unlock(&mddev->open_mutex); - 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)) { - /* Take two references, one is dropped - * when request finishes, one after - * we reclaim rcu_read_lock - */ - 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); + sync_blockdev(mddev->gendisk->part0); + return 0; } -static void md_submit_flush_data(struct work_struct *ws) +/* + * The only difference from bio_chain_endio() is that the current + * bi_status of bio does not affect the bi_status of parent. + */ +static void md_end_flush(struct bio *bio) { - struct mddev *mddev = container_of(ws, struct mddev, flush_work); - struct bio *bio = mddev->flush_bio; + struct bio *parent = bio->bi_private; /* - * must reset flush_bio before calling into md_handle_request to avoid a - * deadlock, because other bios passed md_handle_request suspend check - * could wait for this and below md_handle_request could wait for those - * bios because of suspend check + * If any flush io error before the power failure, + * disk data may be lost. */ - 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_status) + pr_err("md: %pg flush io error %d\n", bio->bi_bdev, + blk_status_to_errno(bio->bi_status)); - if (bio->bi_iter.bi_size == 0) { - /* an empty barrier - all done */ - bio_endio(bio); - } else { - bio->bi_opf &= ~REQ_PREFLUSH; - md_handle_request(mddev, bio); - } + bio_put(bio); + bio_endio(parent); } -/* - * Manages consolidation of flushes and submitting any flushes needed for - * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is - * being finished in another context. Returns false if the flushing is - * complete but still needs the I/O portion of the bio to be processed. - */ bool md_flush_request(struct mddev *mddev, struct bio *bio) { - ktime_t req_start = ktime_get_boottime(); - spin_lock_irq(&mddev->lock); - /* flush requests wait until ongoing flush completes, - * hence coalescing all the pending requests. + struct md_rdev *rdev; + struct bio *new; + + /* + * md_flush_reqeust() should be called under md_handle_request() and + * 'active_io' is already grabbed. Hence it's safe to get rdev directly + * without rcu protection. */ - wait_event_lock_irq(mddev->sb_wait, - !mddev->flush_bio || - ktime_before(req_start, mddev->prev_flush_start), - mddev->lock); - /* new request after previous flush is completed */ - 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 { - /* flush was performed for some other bio while we waited. */ - if (bio->bi_iter.bi_size == 0) - /* an empty barrier - all done */ - bio_endio(bio); - else { - bio->bi_opf &= ~REQ_PREFLUSH; - return false; - } + WARN_ON(percpu_ref_is_zero(&mddev->active_io)); + + rdev_for_each(rdev, mddev) { + if (rdev->raid_disk < 0 || test_bit(Faulty, &rdev->flags)) + continue; + + new = bio_alloc_bioset(rdev->bdev, 0, + REQ_OP_WRITE | REQ_PREFLUSH, GFP_NOIO, + &mddev->bio_set); + new->bi_private = bio; + new->bi_end_io = md_end_flush; + bio_inc_remaining(bio); + submit_bio(new); } - return true; + + if (bio_sectors(bio) == 0) { + bio_endio(bio); + return true; + } + + bio->bi_opf &= ~REQ_PREFLUSH; + return false; } EXPORT_SYMBOL(md_flush_request); @@ -650,53 +631,187 @@ static inline struct mddev *mddev_get(struct mddev *mddev) static void mddev_delayed_delete(struct work_struct *ws); +static void __mddev_put(struct mddev *mddev) +{ + if (mddev->raid_disks || !list_empty(&mddev->disks) || + mddev->ctime || mddev->hold_active) + return; + + /* + * If array is freed by stopping array, MD_DELETED is set by + * do_md_stop(), MD_DELETED is still set here in case mddev is freed + * directly by closing a mddev that is created by create_on_open. + */ + set_bit(MD_DELETED, &mddev->flags); + /* + * Call queue_work inside the spinlock so that flush_workqueue() after + * mddev_find will succeed in waiting for the work to be done. + */ + queue_work(md_misc_wq, &mddev->del_work); +} + +static void mddev_put_locked(struct mddev *mddev) +{ + if (atomic_dec_and_test(&mddev->active)) + __mddev_put(mddev); +} + 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) { - /* Array is not configured at all, and not held active, - * so destroy it */ - set_bit(MD_DELETED, &mddev->flags); - /* - * Call queue_work inside the spinlock so that - * flush_workqueue() after mddev_find will succeed in waiting - * for the work to be done. - */ - INIT_WORK(&mddev->del_work, mddev_delayed_delete); - queue_work(md_misc_wq, &mddev->del_work); - } + __mddev_put(mddev); spin_unlock(&all_mddevs_lock); } static void md_safemode_timeout(struct timer_list *t); +static void md_start_sync(struct work_struct *ws); -void mddev_init(struct mddev *mddev) +static void active_io_release(struct percpu_ref *ref) { + struct mddev *mddev = container_of(ref, struct mddev, active_io); + + wake_up(&mddev->sb_wait); +} + +static void no_op(struct percpu_ref *r) {} + +static bool mddev_set_bitmap_ops(struct mddev *mddev) +{ + struct bitmap_operations *old = mddev->bitmap_ops; + struct md_submodule_head *head; + + if (mddev->bitmap_id == ID_BITMAP_NONE || + (old && old->head.id == mddev->bitmap_id)) + return true; + + xa_lock(&md_submodule); + head = xa_load(&md_submodule, mddev->bitmap_id); + + if (!head) { + pr_warn("md: can't find bitmap id %d\n", mddev->bitmap_id); + goto err; + } + + if (head->type != MD_BITMAP) { + pr_warn("md: invalid bitmap id %d\n", mddev->bitmap_id); + goto err; + } + + mddev->bitmap_ops = (void *)head; + xa_unlock(&md_submodule); + + if (!mddev_is_dm(mddev) && mddev->bitmap_ops->group) { + if (sysfs_create_group(&mddev->kobj, mddev->bitmap_ops->group)) + pr_warn("md: cannot register extra bitmap attributes for %s\n", + mdname(mddev)); + else + /* + * Inform user with KOBJ_CHANGE about new bitmap + * attributes. + */ + kobject_uevent(&mddev->kobj, KOBJ_CHANGE); + } + return true; + +err: + xa_unlock(&md_submodule); + return false; +} + +static void mddev_clear_bitmap_ops(struct mddev *mddev) +{ + if (!mddev_is_dm(mddev) && mddev->bitmap_ops && + mddev->bitmap_ops->group) + sysfs_remove_group(&mddev->kobj, mddev->bitmap_ops->group); + + mddev->bitmap_ops = NULL; +} + +int mddev_init(struct mddev *mddev) +{ + int err = 0; + + if (!IS_ENABLED(CONFIG_MD_BITMAP)) + mddev->bitmap_id = ID_BITMAP_NONE; + else + mddev->bitmap_id = ID_BITMAP; + + if (percpu_ref_init(&mddev->active_io, active_io_release, + PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) + return -ENOMEM; + + if (percpu_ref_init(&mddev->writes_pending, no_op, + PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { + err = -ENOMEM; + goto exit_acitve_io; + } + + err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); + if (err) + goto exit_writes_pending; + + err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); + if (err) + goto exit_bio_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; + + /* We want to start with the refcount at zero */ + percpu_ref_put(&mddev->writes_pending); + mutex_init(&mddev->open_mutex); mutex_init(&mddev->reconfig_mutex); + mutex_init(&mddev->suspend_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->active_io, 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->last_sync_action = ACTION_IDLE; mddev->resync_min = 0; mddev->resync_max = MaxSector; mddev->level = LEVEL_NONE; + + INIT_WORK(&mddev->sync_work, md_start_sync); + INIT_WORK(&mddev->del_work, mddev_delayed_delete); + + return 0; + +exit_sync_set: + bioset_exit(&mddev->sync_set); +exit_bio_set: + bioset_exit(&mddev->bio_set); +exit_writes_pending: + percpu_ref_exit(&mddev->writes_pending); +exit_acitve_io: + percpu_ref_exit(&mddev->active_io); + return err; } EXPORT_SYMBOL_GPL(mddev_init); +void mddev_destroy(struct mddev *mddev) +{ + bioset_exit(&mddev->bio_set); + bioset_exit(&mddev->sync_set); + bioset_exit(&mddev->io_clone_set); + percpu_ref_exit(&mddev->active_io); + percpu_ref_exit(&mddev->writes_pending); +} +EXPORT_SYMBOL_GPL(mddev_destroy); + static struct mddev *mddev_find_locked(dev_t unit) { struct mddev *mddev; @@ -740,13 +855,16 @@ static struct mddev *mddev_alloc(dev_t unit) new = kzalloc(sizeof(*new), GFP_KERNEL); if (!new) return ERR_PTR(-ENOMEM); - mddev_init(new); + + error = mddev_init(new); + if (error) + goto out_free_new; spin_lock(&all_mddevs_lock); if (unit) { error = -EEXIST; if (mddev_find_locked(unit)) - goto out_free_new; + goto out_destroy_new; new->unit = unit; if (MAJOR(unit) == MD_MAJOR) new->md_minor = MINOR(unit); @@ -757,7 +875,7 @@ static struct mddev *mddev_alloc(dev_t unit) error = -ENODEV; new->unit = mddev_alloc_unit(); if (!new->unit) - goto out_free_new; + goto out_destroy_new; new->md_minor = MINOR(new->unit); new->hold_active = UNTIL_STOP; } @@ -765,8 +883,11 @@ static struct mddev *mddev_alloc(dev_t unit) list_add(&new->all_mddevs, &all_mddevs); spin_unlock(&all_mddevs_lock); return new; -out_free_new: + +out_destroy_new: spin_unlock(&all_mddevs_lock); + mddev_destroy(new); +out_free_new: kfree(new); return ERR_PTR(error); } @@ -777,6 +898,7 @@ static void mddev_free(struct mddev *mddev) list_del(&mddev->all_mddevs); spin_unlock(&all_mddevs_lock); + mddev_destroy(mddev); kfree(mddev); } @@ -784,6 +906,13 @@ 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) { /* These cannot be removed under reconfig_mutex as * an access to the files will try to take reconfig_mutex @@ -823,13 +952,30 @@ void mddev_unlock(struct mddev *mddev) } else mutex_unlock(&mddev->reconfig_mutex); - /* As we've dropped the mutex we need a spinlock to - * make sure the thread doesn't disappear - */ - spin_lock(&pers_lock); md_wakeup_thread(mddev->thread); wake_up(&mddev->sb_wait); - spin_unlock(&pers_lock); + + list_for_each_entry_safe(rdev, tmp, &delete, same_set) { + list_del_init(&rdev->same_set); + kobject_del(&rdev->kobj); + export_rdev(rdev, mddev); + } + + if (!legacy_async_del_gendisk) { + /* + * Call del_gendisk after release reconfig_mutex to avoid + * deadlock (e.g. call del_gendisk under the lock and an + * access to sysfs files waits the lock) + * And MD_DELETED is only used for md raid which is set in + * do_md_stop. dm raid only uses md_stop to stop. So dm raid + * doesn't need to check MD_DELETED when getting reconfig lock + */ + if (test_bit(MD_DELETED, &mddev->flags) && + !test_and_set_bit(MD_DO_DELETE, &mddev->flags)) { + kobject_del(&mddev->kobj); + del_gendisk(mddev->gendisk); + } + } } EXPORT_SYMBOL_GPL(mddev_unlock); @@ -868,16 +1014,40 @@ struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev) } EXPORT_SYMBOL_GPL(md_find_rdev_rcu); -static struct md_personality *find_pers(int level, char *clevel) +static struct md_personality *get_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; + struct md_personality *ret = NULL; + struct md_submodule_head *head; + unsigned long i; + + xa_lock(&md_submodule); + xa_for_each(&md_submodule, i, head) { + if (head->type != MD_PERSONALITY) + continue; + if ((level != LEVEL_NONE && head->id == level) || + !strcmp(head->name, clevel)) { + if (try_module_get(head->owner)) + ret = (void *)head; + break; + } } - return NULL; + xa_unlock(&md_submodule); + + if (!ret) { + if (level != LEVEL_NONE) + pr_warn("md: personality for level %d is not loaded!\n", + level); + else + pr_warn("md: personality for level %s is not loaded!\n", + clevel); + } + + return ret; +} + +static void put_pers(struct md_personality *pers) +{ + module_put(pers->head.owner); } /* return the offset of the super block in 512byte sectors */ @@ -936,15 +1106,26 @@ static void super_written(struct bio *bio) wake_up(&mddev->sb_wait); } -void md_super_write(struct mddev *mddev, struct md_rdev *rdev, - sector_t sector, int size, struct page *page) +/** + * md_write_metadata - write metadata to underlying disk, including + * array superblock, badblocks, bitmap superblock and bitmap bits. + * @mddev: the array to write + * @rdev: the underlying disk to write + * @sector: the offset to @rdev + * @size: the length of the metadata + * @page: the metadata + * @offset: the offset to @page + * + * Write @size bytes of @page start from @offset, to @sector of @rdev, Increment + * mddev->pending_writes before returning, and decrement it on completion, + * waking up sb_wait. Caller must call md_super_wait() after issuing io to all + * rdev. If an error occurred, md_error() will be called, and the @rdev will be + * kicked out from @mddev. + */ +void md_write_metadata(struct mddev *mddev, struct md_rdev *rdev, + sector_t sector, int size, struct page *page, + unsigned int offset) { - /* write first size bytes of page to sector of rdev - * Increment mddev->pending_writes before returning - * and decrement it on completion, waking up sb_wait - * if zero is reached. - * If an error occurred, call md_error - */ struct bio *bio; if (!page) @@ -954,14 +1135,15 @@ void md_super_write(struct mddev *mddev, struct md_rdev *rdev, 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); + 1, + REQ_OP_WRITE | REQ_SYNC | REQ_IDLE | REQ_META + | 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_add_page(bio, page, size, offset); bio->bi_private = rdev; bio->bi_end_io = super_written; @@ -1002,7 +1184,7 @@ int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, 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); + __bio_add_page(&bio, page, size, 0); submit_bio_wait(&bio); @@ -1136,6 +1318,7 @@ struct super_type { struct md_rdev *refdev, int minor_version); int (*validate_super)(struct mddev *mddev, + struct md_rdev *freshest, struct md_rdev *rdev); void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); @@ -1158,7 +1341,7 @@ 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); + mdname(mddev), mddev->pers->head.name); return 1; } EXPORT_SYMBOL(md_check_no_bitmap); @@ -1216,17 +1399,11 @@ static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor 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; - - /* not spare disk, or LEVEL_MULTIPATH */ - 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)))) + rdev->desc_nr = sb->this_disk.number; + + /* not spare disk */ + if (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) { @@ -1271,10 +1448,26 @@ static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor return ret; } +static u64 md_bitmap_events_cleared(struct mddev *mddev) +{ + struct md_bitmap_stats stats; + int err; + + if (!md_bitmap_enabled(mddev, false)) + return 0; + + err = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats); + if (err) + return 0; + + return stats.events_cleared; +} + /* * validate_super for 0.90.0 + * note: we are not using "freshest" for 0.9 superblock */ -static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) +static int super_90_validate(struct mddev *mddev, struct md_rdev *freshest, struct md_rdev *rdev) { mdp_disk_t *desc; mdp_super_t *sb = page_address(rdev->sb_page); @@ -1326,13 +1519,13 @@ static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) mddev->layout = -1; if (sb->state & (1<<MD_SB_CLEAN)) - mddev->recovery_cp = MaxSector; + mddev->resync_offset = MaxSector; else { if (sb->events_hi == sb->cp_events_hi && sb->events_lo == sb->cp_events_lo) { - mddev->recovery_cp = sb->recovery_cp; + mddev->resync_offset = sb->recovery_cp; } else - mddev->recovery_cp = 0; + mddev->resync_offset = 0; } memcpy(mddev->uuid+0, &sb->set_uuid0, 4); @@ -1362,7 +1555,7 @@ static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) /* if adding to array with a bitmap, then we can accept an * older device ... but not too old. */ - if (ev1 < mddev->bitmap->events_cleared) + if (ev1 < md_bitmap_events_cleared(mddev)) return 0; if (ev1 < mddev->events) set_bit(Bitmap_sync, &rdev->flags); @@ -1372,31 +1565,28 @@ static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) return 0; } - if (mddev->level != LEVEL_MULTIPATH) { - desc = sb->disks + rdev->desc_nr; + 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) /* && - desc->raid_disk < mddev->raid_disks */) { - set_bit(In_sync, &rdev->flags); + 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)) { + /* active but not in sync implies recovery up to + * reshape position. We don't know exactly where + * that is, so set to zero for now + */ + if (mddev->minor_version >= 91) { + rdev->recovery_offset = 0; rdev->raid_disk = desc->raid_disk; - rdev->saved_raid_disk = desc->raid_disk; - } else if (desc->state & (1<<MD_DISK_ACTIVE)) { - /* active but not in sync implies recovery up to - * reshape position. We don't know exactly where - * that is, so set to zero for now */ - 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 /* MULTIPATH are always insync */ - set_bit(In_sync, &rdev->flags); + } + if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) + set_bit(WriteMostly, &rdev->flags); + if (desc->state & (1<<MD_DISK_FAILFAST)) + set_bit(FailFast, &rdev->flags); return 0; } @@ -1461,10 +1651,10 @@ static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) mddev->minor_version = sb->minor_version; if (mddev->in_sync) { - sb->recovery_cp = mddev->recovery_cp; + sb->recovery_cp = mddev->resync_offset; sb->cp_events_hi = (mddev->events>>32); sb->cp_events_lo = (u32)mddev->events; - if (mddev->recovery_cp == MaxSector) + if (mddev->resync_offset == MaxSector) sb->state = (1<< MD_SB_CLEAN); } else sb->recovery_cp = 0; @@ -1563,8 +1753,8 @@ super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 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); + md_write_metadata(rdev->mddev, rdev, rdev->sb_start, + rdev->sb_size, rdev->sb_page, 0); } while (md_super_wait(rdev->mddev) < 0); return num_sectors; } @@ -1662,9 +1852,13 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_ } if (sb->pad0 || sb->pad3[0] || - memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) - /* Some padding is non-zero, might be a new feature */ - return -EINVAL; + memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) { + pr_warn("Some padding is non-zero on %pg, might be a new feature\n", + rdev->bdev); + if (check_new_feature) + return -EINVAL; + pr_warn("check_new_feature is disabled, data corruption possible\n"); + } rdev->preferred_minor = 0xffff; rdev->data_offset = le64_to_cpu(sb->data_offset); @@ -1686,10 +1880,7 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_ && 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); + rdev->desc_nr = le32_to_cpu(sb->dev_number); if (!rdev->bb_page) { rdev->bb_page = alloc_page(GFP_KERNEL); @@ -1725,7 +1916,7 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_ count <<= sb->bblog_shift; if (bb + 1 == 0) break; - if (badblocks_set(&rdev->badblocks, sector, count, 1)) + if (!badblocks_set(&rdev->badblocks, sector, count, 1)) return -EINVAL; } } else if (sb->bblog_offset != 0) @@ -1742,12 +1933,10 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_ sb->level != 0) return -EINVAL; - /* not spare disk, or LEVEL_MULTIPATH */ - 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))) + /* not spare disk */ + 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)) spare_disk = false; if (!refdev) { @@ -1786,10 +1975,11 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_ return ret; } -static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) +static int super_1_validate(struct mddev *mddev, struct md_rdev *freshest, struct md_rdev *rdev) { struct mdp_superblock_1 *sb = page_address(rdev->sb_page); __u64 ev1 = le64_to_cpu(sb->events); + int role; rdev->raid_disk = -1; clear_bit(Faulty, &rdev->flags); @@ -1809,6 +1999,7 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) 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->logical_block_size = le32_to_cpu(sb->logical_block_size); mddev->events = ev1; mddev->bitmap_info.offset = 0; mddev->bitmap_info.space = 0; @@ -1819,7 +2010,7 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) mddev->bitmap_info.default_space = (4096-1024) >> 9; mddev->reshape_backwards = 0; - mddev->recovery_cp = le64_to_cpu(sb->resync_offset); + mddev->resync_offset = le64_to_cpu(sb->resync_offset); memcpy(mddev->uuid, sb->set_uuid, 16); mddev->max_disks = (4096-256)/2; @@ -1882,19 +2073,21 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) } } else if (mddev->pers == NULL) { /* Insist of good event counter while assembling, except for - * spares (which don't need an event count) */ - ++ev1; + * spares (which don't need an event count). + * Similar to mdadm, we allow event counter difference of 1 + * from the freshest device. + */ 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) + if (ev1 + 1 < mddev->events) return -EINVAL; } else if (mddev->bitmap) { /* If adding to array with a bitmap, then we can accept an * older device, but not too old. */ - if (ev1 < mddev->bitmap->events_cleared) + if (ev1 < md_bitmap_events_cleared(mddev)) return 0; if (ev1 < mddev->events) set_bit(Bitmap_sync, &rdev->flags); @@ -1903,58 +2096,85 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) /* just a hot-add of a new device, leave raid_disk at -1 */ 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: /* spare */ - break; - case MD_DISK_ROLE_FAULTY: /* faulty */ - set_bit(Faulty, &rdev->flags); - break; - case MD_DISK_ROLE_JOURNAL: /* journal device */ - if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) { - /* journal device without journal feature */ - 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 the array is FROZEN, then the device can't - * be in_sync with rest of array. - */ - if (!test_bit(MD_RECOVERY_FROZEN, - &mddev->recovery)) - set_bit(In_sync, &rdev->flags); - } - rdev->raid_disk = role; - break; + + if (rdev->desc_nr < 0 || + rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { + role = MD_DISK_ROLE_SPARE; + rdev->desc_nr = -1; + } else if (mddev->pers == NULL && freshest && ev1 < mddev->events) { + /* + * If we are assembling, and our event counter is smaller than the + * highest event counter, we cannot trust our superblock about the role. + * It could happen that our rdev was marked as Faulty, and all other + * superblocks were updated with +1 event counter. + * Then, before the next superblock update, which typically happens when + * remove_and_add_spares() removes the device from the array, there was + * a crash or reboot. + * If we allow current rdev without consulting the freshest superblock, + * we could cause data corruption. + * Note that in this case our event counter is smaller by 1 than the + * highest, otherwise, this rdev would not be allowed into array; + * both kernel and mdadm allow event counter difference of 1. + */ + struct mdp_superblock_1 *freshest_sb = page_address(freshest->sb_page); + u32 freshest_max_dev = le32_to_cpu(freshest_sb->max_dev); + + if (rdev->desc_nr >= freshest_max_dev) { + /* this is unexpected, better not proceed */ + pr_warn("md: %s: rdev[%pg]: desc_nr(%d) >= freshest(%pg)->sb->max_dev(%u)\n", + mdname(mddev), rdev->bdev, rdev->desc_nr, + freshest->bdev, freshest_max_dev); + return -EUCLEAN; } - 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 /* MULTIPATH are always insync */ - set_bit(In_sync, &rdev->flags); + + role = le16_to_cpu(freshest_sb->dev_roles[rdev->desc_nr]); + pr_debug("md: %s: rdev[%pg]: role=%d(0x%x) according to freshest %pg\n", + mdname(mddev), rdev->bdev, role, role, freshest->bdev); + } else { + role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); + } + switch (role) { + case MD_DISK_ROLE_SPARE: /* spare */ + break; + case MD_DISK_ROLE_FAULTY: /* faulty */ + set_bit(Faulty, &rdev->flags); + break; + case MD_DISK_ROLE_JOURNAL: /* journal device */ + if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) { + /* journal device without journal feature */ + 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 the array is FROZEN, then the device can't + * be in_sync with rest of array. + */ + 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); return 0; } @@ -1976,7 +2196,7 @@ static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) 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); + sb->resync_offset = cpu_to_le64(mddev->resync_offset); else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags)) sb->resync_offset = cpu_to_le64(MaxSector); else @@ -1989,6 +2209,7 @@ static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) sb->chunksize = cpu_to_le32(mddev->chunk_sectors); sb->level = cpu_to_le32(mddev->level); sb->layout = cpu_to_le32(mddev->layout); + sb->logical_block_size = cpu_to_le32(mddev->logical_block_size); if (test_bit(FailFast, &rdev->flags)) sb->devflags |= FailFast1; else @@ -2187,8 +2408,8 @@ super_1_rdev_size_change(struct md_rdev *rdev, sector_t 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); + md_write_metadata(rdev->mddev, rdev, rdev->sb_start, + rdev->sb_size, rdev->sb_page, 0); } while (md_super_wait(rdev->mddev) < 0); return num_sectors; @@ -2198,14 +2419,15 @@ static int super_1_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) { + struct mddev *mddev = rdev->mddev; + /* All necessary checks on new >= old have been done */ - struct bitmap *bitmap; if (new_offset >= rdev->data_offset) return 1; /* with 1.0 metadata, there is no metadata to tread on * so we can always move back */ - if (rdev->mddev->minor_version == 0) + if (mddev->minor_version == 0) return 1; /* otherwise we must be sure not to step on @@ -2216,11 +2438,17 @@ super_1_allow_new_offset(struct md_rdev *rdev, */ 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 (md_bitmap_registered(mddev) && !mddev->bitmap_info.file) { + struct md_bitmap_stats stats; + int err; + + err = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats); + if (!err && rdev->sb_start + mddev->bitmap_info.offset + + stats.file_pages * (PAGE_SIZE >> 9) > new_offset) + return 0; + } + if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) return 0; @@ -2296,81 +2524,16 @@ 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; /* nothing to do */ - if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) - return 0; /* shouldn't register, or already is */ - rdev_for_each(rdev, mddev) { - /* skip spares and non-functional disks */ - if (test_bit(Faulty, &rdev->flags)) - continue; - if (rdev->raid_disk < 0) - continue; - if (!reference) { - /* Use the first rdev as the reference */ - reference = rdev; - continue; - } - /* does this rdev's profile match the reference profile? */ - if (blk_integrity_compare(reference->bdev->bd_disk, - rdev->bdev->bd_disk) < 0) - return -EINVAL; - } - if (!reference || !bdev_get_integrity(reference->bdev)) - return 0; - /* - * All component devices are integrity capable and have matching - * profiles, register the common profile for the md device. - */ - blk_integrity_register(mddev->gendisk, - bdev_get_integrity(reference->bdev)); + if (mddev_is_dm(mddev) || !blk_get_integrity(mddev->gendisk)) + return 0; /* shouldn't register */ 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_acct_set, BIO_POOL_SIZE))) { - /* - * No need to handle the failure of bioset_integrity_create, - * because the function is called by md_run() -> pers->run(), - * md_run calls bioset_exit -> bioset_integrity_free in case - * of failure case. - */ - pr_err("md: failed to create integrity pool for %s\n", - mdname(mddev)); - return -EINVAL; - } return 0; } EXPORT_SYMBOL(md_integrity_register); -/* - * Attempt to add an rdev, but only if it is consistent with the current - * integrity profile - */ -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) /* nothing to do */ - 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) || @@ -2436,7 +2599,7 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) pr_debug("md: bind<%s>\n", b); if (mddev->raid_disks) - mddev_create_serial_pool(mddev, rdev, false); + mddev_create_serial_pool(mddev, rdev); if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) goto fail; @@ -2460,19 +2623,16 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) fail: pr_warn("md: failed to register dev-%s for %s\n", b, mdname(mddev)); + mddev_destroy_serial_pool(mddev, rdev); return err; } -static void rdev_delayed_delete(struct work_struct *ws) -{ - struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); - kobject_del(&rdev->kobj); - kobject_put(&rdev->kobj); -} - void md_autodetect_dev(dev_t dev); -static void export_rdev(struct md_rdev *rdev) +/* just for claiming the bdev */ +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); @@ -2480,18 +2640,20 @@ static void export_rdev(struct md_rdev *rdev) if (test_bit(AutoDetected, &rdev->flags)) md_autodetect_dev(rdev->bdev->bd_dev); #endif - blkdev_put(rdev->bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); + fput(rdev->bdev_file); 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; + mddev_destroy_serial_pool(rdev->mddev, rdev); + WRITE_ONCE(rdev->mddev, NULL); sysfs_remove_link(&rdev->kobj, "block"); sysfs_put(rdev->sysfs_state); sysfs_put(rdev->sysfs_unack_badblocks); @@ -2500,15 +2662,15 @@ static void md_kick_rdev_from_array(struct md_rdev *rdev) rdev->sysfs_unack_badblocks = NULL; rdev->sysfs_badblocks = NULL; rdev->badblocks.count = 0; - /* We need to delay this, otherwise we can deadlock when - * writing to 'remove' to "dev/state". We also need - * to delay it due to rcu usage. - */ + synchronize_rcu(); - INIT_WORK(&rdev->del_work, rdev_delayed_delete); - kobject_get(&rdev->kobj); - queue_work(md_rdev_misc_wq, &rdev->del_work); - export_rdev(rdev); + + /* + * kobject_del() will wait for all in progress writers to be done, where + * reconfig_mutex is held, hence it can't be called under + * reconfig_mutex and it's delayed to mddev_unlock(). + */ + list_add(&rdev->same_set, &mddev->deleting); } static void export_array(struct mddev *mddev) @@ -2626,6 +2788,7 @@ void md_update_sb(struct mddev *mddev, int force_change) if (!md_is_rdwr(mddev)) { if (force_change) set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + pr_err("%s: can't update sb for read-only array %s\n", __func__, mdname(mddev)); return; } @@ -2635,11 +2798,11 @@ repeat: 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); + ret = mddev->cluster_ops->metadata_update_start(mddev); /* Has someone else has updated the sb */ if (!does_sb_need_changing(mddev)) { if (ret == 0) - md_cluster_ops->metadata_update_cancel(mddev); + mddev->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)); @@ -2716,7 +2879,7 @@ repeat: /* If this is just a dirty<->clean transition, and the array is clean * and 'events' is odd, we can roll back to the previous clean state */ if (nospares - && (mddev->in_sync && mddev->recovery_cp == MaxSector) + && (mddev->in_sync && mddev->resync_offset == MaxSector) && mddev->can_decrease_events && mddev->events != 1) { mddev->events--; @@ -2747,44 +2910,39 @@ repeat: 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"); + mddev_add_trace_msg(mddev, "md md_update_sb"); rewrite: - md_bitmap_update_sb(mddev->bitmap); + if (md_bitmap_enabled(mddev, false)) + mddev->bitmap_ops->update_sb(mddev->bitmap); rdev_for_each(rdev, mddev) { if (rdev->sb_loaded != 1) continue; /* no noise on spare devices */ if (!test_bit(Faulty, &rdev->flags)) { - md_super_write(mddev,rdev, - rdev->sb_start, rdev->sb_size, - rdev->sb_page); + md_write_metadata(mddev, rdev, rdev->sb_start, + rdev->sb_size, rdev->sb_page, 0); 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); + md_write_metadata(mddev, rdev, + rdev->badblocks.sector, + rdev->badblocks.size << 9, + rdev->bb_page, 0); rdev->badblocks.size = 0; } } else pr_debug("md: %pg (skipping faulty)\n", rdev->bdev); - - if (mddev->level == LEVEL_MULTIPATH) - /* only need to write one superblock... */ - break; } if (md_super_wait(mddev) < 0) goto rewrite; /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */ if (mddev_is_clustered(mddev) && ret == 0) - md_cluster_ops->metadata_update_finish(mddev); + mddev->cluster_ops->metadata_update_finish(mddev); if (mddev->in_sync != sync_req || !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), @@ -2819,12 +2977,8 @@ static int add_bound_rdev(struct md_rdev *rdev) * and should be added immediately. */ super_types[mddev->major_version]. - validate_super(mddev, rdev); - if (add_journal) - mddev_suspend(mddev); + validate_super(mddev, NULL/*freshest*/, rdev); err = mddev->pers->hot_add_disk(mddev, rdev); - if (add_journal) - mddev_resume(mddev); if (err) { md_kick_rdev_from_array(rdev); return err; @@ -2837,7 +2991,6 @@ static int add_bound_rdev(struct md_rdev *rdev) set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); md_new_event(); - md_wakeup_thread(mddev->thread); return 0; } @@ -2948,24 +3101,22 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len) else { err = 0; if (mddev_is_clustered(mddev)) - err = md_cluster_ops->remove_disk(mddev, rdev); + err = mddev->cluster_ops->remove_disk(mddev, rdev); if (err == 0) { md_kick_rdev_from_array(rdev); - if (mddev->pers) { + 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); + mddev_create_serial_pool(rdev->mddev, rdev); need_update_sb = true; err = 0; } else if (cmd_match(buf, "-writemostly")) { - mddev_destroy_serial_pool(rdev->mddev, rdev, false); + mddev_destroy_serial_pool(rdev->mddev, rdev); clear_bit(WriteMostly, &rdev->flags); need_update_sb = true; err = 0; @@ -2985,7 +3136,6 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len) 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) { @@ -3023,7 +3173,6 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len) !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")) { /* Clearing 'want_replacement' is always allowed. @@ -3062,7 +3211,7 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len) * by this node eventually */ if (!mddev_is_clustered(rdev->mddev) || - (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { + (err = mddev->cluster_ops->gather_bitmaps(rdev)) == 0) { clear_bit(Faulty, &rdev->flags); err = add_bound_rdev(rdev); } @@ -3131,6 +3280,9 @@ slot_store(struct md_rdev *rdev, const char *buf, size_t len) err = kstrtouint(buf, 10, (unsigned int *)&slot); if (err < 0) return err; + if (slot < 0) + /* overflow */ + return -ENOSPC; } if (rdev->mddev->pers && slot == -1) { /* Setting 'slot' on an active array requires also @@ -3150,7 +3302,6 @@ slot_store(struct md_rdev *rdev, const char *buf, size_t len) 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) { /* Activating a spare .. or possibly reactivating * if we ever get bitmaps working here. @@ -3244,8 +3395,7 @@ static ssize_t new_offset_store(struct md_rdev *rdev, if (kstrtoull(buf, 10, &new_offset) < 0) return -EINVAL; - if (mddev->sync_thread || - test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) return -EBUSY; if (new_offset == rdev->data_offset) /* reset is always permitted */ @@ -3573,21 +3723,39 @@ rdev_attr_store(struct kobject *kobj, struct attribute *attr, { 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; + bool suspend = false; ssize_t rv; - struct mddev *mddev = rdev->mddev; + struct mddev *mddev = READ_ONCE(rdev->mddev); if (!entry->store) return -EIO; if (!capable(CAP_SYS_ADMIN)) return -EACCES; - rv = mddev ? mddev_lock(mddev) : -ENODEV; + if (!mddev) + return -ENODEV; + + if (entry->store == state_store) { + if (cmd_match(page, "remove")) + kn = sysfs_break_active_protection(kobj, attr); + if (cmd_match(page, "remove") || cmd_match(page, "re-add") || + cmd_match(page, "writemostly") || + cmd_match(page, "-writemostly")) + suspend = true; + } + + rv = suspend ? mddev_suspend_and_lock(mddev) : mddev_lock(mddev); if (!rv) { if (rdev->mddev == NULL) rv = -ENODEV; else rv = entry->store(rdev, page, length); - mddev_unlock(mddev); + suspend ? mddev_unlock_and_resume(mddev) : mddev_unlock(mddev); } + + if (kn) + sysfs_unbreak_active_protection(kn); + return rv; } @@ -3600,7 +3768,7 @@ static const struct sysfs_ops rdev_sysfs_ops = { .show = rdev_attr_show, .store = rdev_attr_store, }; -static struct kobj_type rdev_ktype = { +static const struct kobj_type rdev_ktype = { .release = rdev_free, .sysfs_ops = &rdev_sysfs_ops, .default_groups = rdev_default_groups, @@ -3632,6 +3800,7 @@ int md_rdev_init(struct md_rdev *rdev) return badblocks_init(&rdev->badblocks, 0); } EXPORT_SYMBOL_GPL(md_rdev_init); + /* * Import a device. If 'super_format' >= 0, then sanity check the superblock * @@ -3644,7 +3813,6 @@ EXPORT_SYMBOL_GPL(md_rdev_init); */ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) { - static struct md_rdev claim_rdev; /* just for claiming the bdev */ struct md_rdev *rdev; sector_t size; int err; @@ -3660,15 +3828,16 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe if (err) goto out_clear_rdev; - rdev->bdev = blkdev_get_by_dev(newdev, - FMODE_READ | FMODE_WRITE | FMODE_EXCL, - super_format == -2 ? &claim_rdev : rdev); - if (IS_ERR(rdev->bdev)) { + rdev->bdev_file = bdev_file_open_by_dev(newdev, + BLK_OPEN_READ | BLK_OPEN_WRITE, + super_format == -2 ? &claim_rdev : rdev, NULL); + if (IS_ERR(rdev->bdev_file)) { pr_warn("md: could not open device unknown-block(%u,%u).\n", MAJOR(newdev), MINOR(newdev)); - err = PTR_ERR(rdev->bdev); + err = PTR_ERR(rdev->bdev_file); goto out_clear_rdev; } + rdev->bdev = file_bdev(rdev->bdev_file); kobject_init(&rdev->kobj, &rdev_ktype); @@ -3699,7 +3868,7 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe return rdev; out_blkdev_put: - blkdev_put(rdev->bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); + fput(rdev->bdev_file); out_clear_rdev: md_rdev_clear(rdev); out_free_rdev: @@ -3738,7 +3907,7 @@ static int analyze_sbs(struct mddev *mddev) } super_types[mddev->major_version]. - validate_super(mddev, freshest); + validate_super(mddev, NULL/*freshest*/, freshest); i = 0; rdev_for_each_safe(rdev, tmp, mddev) { @@ -3753,20 +3922,15 @@ static int analyze_sbs(struct mddev *mddev) } if (rdev != freshest) { if (super_types[mddev->major_version]. - validate_super(mddev, rdev)) { + validate_super(mddev, freshest, 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)) { + 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); } @@ -3814,8 +3978,9 @@ int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) static ssize_t safe_delay_show(struct mddev *mddev, char *page) { - int msec = (mddev->safemode_delay*1000)/HZ; - return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); + 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) @@ -3827,7 +3992,7 @@ safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) return -EINVAL; } - if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) + if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ) return -EINVAL; if (msec == 0) mddev->safemode_delay = 0; @@ -3854,7 +4019,7 @@ level_show(struct mddev *mddev, char *page) spin_lock(&mddev->lock); p = mddev->pers; if (p) - ret = sprintf(page, "%s\n", p->name); + ret = sprintf(page, "%s\n", p->head.name); else if (mddev->clevel[0]) ret = sprintf(page, "%s\n", mddev->clevel); else if (mddev->level != LEVEL_NONE) @@ -3879,12 +4044,12 @@ level_store(struct mddev *mddev, const char *buf, size_t len) if (slen == 0 || slen >= sizeof(clevel)) return -EINVAL; - rv = mddev_lock(mddev); + rv = mddev_suspend_and_lock(mddev); if (rv) return rv; if (mddev->pers == NULL) { - strncpy(mddev->clevel, buf, slen); + memcpy(mddev->clevel, buf, slen); if (mddev->clevel[slen-1] == '\n') slen--; mddev->clevel[slen] = 0; @@ -3903,8 +4068,7 @@ level_store(struct mddev *mddev, const char *buf, size_t len) */ rv = -EBUSY; - if (mddev->sync_thread || - test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || mddev->reshape_position != MaxSector || mddev->sysfs_active) goto out_unlock; @@ -3912,12 +4076,12 @@ level_store(struct mddev *mddev, const char *buf, size_t len) rv = -EINVAL; if (!mddev->pers->quiesce) { pr_warn("md: %s: %s does not support online personality change\n", - mdname(mddev), mddev->pers->name); + mdname(mddev), mddev->pers->head.name); goto out_unlock; } /* Now find the new personality */ - strncpy(clevel, buf, slen); + memcpy(clevel, buf, slen); if (clevel[slen-1] == '\n') slen--; clevel[slen] = 0; @@ -3926,24 +4090,20 @@ level_store(struct mddev *mddev, const char *buf, size_t len) 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); + pers = get_pers(level, clevel); + if (!pers) { rv = -EINVAL; goto out_unlock; } - spin_unlock(&pers_lock); if (pers == mddev->pers) { /* Nothing to do! */ - module_put(pers->owner); + put_pers(pers); rv = len; goto out_unlock; } if (!pers->takeover) { - module_put(pers->owner); + put_pers(pers); pr_warn("md: %s: %s does not support personality takeover\n", mdname(mddev), clevel); rv = -EINVAL; @@ -3964,7 +4124,7 @@ level_store(struct mddev *mddev, const char *buf, size_t len) mddev->raid_disks -= mddev->delta_disks; mddev->delta_disks = 0; mddev->reshape_backwards = 0; - module_put(pers->owner); + put_pers(pers); pr_warn("md: %s: %s would not accept array\n", mdname(mddev), clevel); rv = PTR_ERR(priv); @@ -3972,7 +4132,6 @@ level_store(struct mddev *mddev, const char *buf, size_t len) } /* Looks like we have a winner */ - mddev_suspend(mddev); mddev_detach(mddev); spin_lock(&mddev->lock); @@ -3980,7 +4139,7 @@ level_store(struct mddev *mddev, const char *buf, size_t len) oldpriv = mddev->private; mddev->pers = pers; mddev->private = priv; - strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); + strscpy(mddev->clevel, pers->head.name, sizeof(mddev->clevel)); mddev->level = mddev->new_level; mddev->layout = mddev->new_layout; mddev->chunk_sectors = mddev->new_chunk_sectors; @@ -4022,7 +4181,7 @@ level_store(struct mddev *mddev, const char *buf, size_t len) mddev->to_remove = &md_redundancy_group; } - module_put(oldpers->owner); + put_pers(oldpers); rdev_for_each(rdev, mddev) { if (rdev->raid_disk < 0) @@ -4053,19 +4212,17 @@ level_store(struct mddev *mddev, const char *buf, size_t len) * it must always be in_sync */ mddev->in_sync = 1; - del_timer_sync(&mddev->safemode_timer); + timer_delete_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); + mddev_unlock_and_resume(mddev); return rv; } @@ -4073,6 +4230,114 @@ static struct md_sysfs_entry md_level = __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); static ssize_t +new_level_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%d\n", mddev->new_level); +} + +static ssize_t +new_level_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; + + mddev->new_level = n; + md_update_sb(mddev, 1); + + mddev_unlock(mddev); + return len; +} +static struct md_sysfs_entry md_new_level = +__ATTR(new_level, 0664, new_level_show, new_level_store); + +static ssize_t +bitmap_type_show(struct mddev *mddev, char *page) +{ + struct md_submodule_head *head; + unsigned long i; + ssize_t len = 0; + + if (mddev->bitmap_id == ID_BITMAP_NONE) + len += sprintf(page + len, "[none] "); + else + len += sprintf(page + len, "none "); + + xa_lock(&md_submodule); + xa_for_each(&md_submodule, i, head) { + if (head->type != MD_BITMAP) + continue; + + if (mddev->bitmap_id == head->id) + len += sprintf(page + len, "[%s] ", head->name); + else + len += sprintf(page + len, "%s ", head->name); + } + xa_unlock(&md_submodule); + + len += sprintf(page + len, "\n"); + return len; +} + +static ssize_t +bitmap_type_store(struct mddev *mddev, const char *buf, size_t len) +{ + struct md_submodule_head *head; + enum md_submodule_id id; + unsigned long i; + int err = 0; + + xa_lock(&md_submodule); + + if (mddev->bitmap_ops) { + err = -EBUSY; + goto out; + } + + if (cmd_match(buf, "none")) { + mddev->bitmap_id = ID_BITMAP_NONE; + goto out; + } + + xa_for_each(&md_submodule, i, head) { + if (head->type == MD_BITMAP && cmd_match(buf, head->name)) { + mddev->bitmap_id = head->id; + goto out; + } + } + + err = kstrtoint(buf, 10, &id); + if (err) + goto out; + + if (id == ID_BITMAP_NONE) { + mddev->bitmap_id = id; + goto out; + } + + head = xa_load(&md_submodule, id); + if (head && head->type == MD_BITMAP) { + mddev->bitmap_id = id; + goto out; + } + + err = -ENOENT; + +out: + xa_unlock(&md_submodule); + return err ? err : len; +} + +static struct md_sysfs_entry md_bitmap_type = +__ATTR(bitmap_type, 0664, bitmap_type_show, bitmap_type_store); + +static ssize_t layout_show(struct mddev *mddev, char *page) { /* just a number, not meaningful for all levels */ @@ -4230,9 +4495,9 @@ __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) + if (mddev->resync_offset == MaxSector) return sprintf(page, "none\n"); - return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); + return sprintf(page, "%llu\n", (unsigned long long)mddev->resync_offset); } static ssize_t @@ -4258,7 +4523,7 @@ resync_start_store(struct mddev *mddev, const char *buf, size_t len) err = -EBUSY; if (!err) { - mddev->recovery_cp = n; + mddev->resync_offset = n; if (mddev->pers) set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); } @@ -4363,8 +4628,8 @@ array_state_show(struct mddev *mddev, char *page) 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 do_md_stop(struct mddev *mddev, int ro); +static int md_set_readonly(struct mddev *mddev); static int restart_array(struct mddev *mddev); static ssize_t @@ -4373,6 +4638,29 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) int err = 0; enum array_state st = match_word(buf, array_states); + /* No lock dependent actions */ + switch (st) { + case suspended: /* not supported yet */ + case write_pending: /* cannot be set */ + case active_idle: /* cannot be set */ + case broken: /* cannot be set */ + case bad_word: + return -EINVAL; + case clear: + case readonly: + case inactive: + case read_auto: + if (!mddev->pers || !md_is_rdwr(mddev)) + break; + /* write sysfs will not open mddev and opener should be 0 */ + err = mddev_set_closing_and_sync_blockdev(mddev, 0); + if (err) + return err; + break; + default: + break; + } + if (mddev->pers && (st == active || st == clean) && mddev->ro != MD_RDONLY) { /* don't take reconfig_mutex when toggling between @@ -4397,26 +4685,19 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) err = mddev_lock(mddev); if (err) return err; - err = -EINVAL; - switch(st) { - case bad_word: - break; - case clear: - /* stopping an active array */ - err = do_md_stop(mddev, 0, NULL); - break; + + switch (st) { case inactive: - /* stopping an active array */ + /* stop an active array, return 0 otherwise */ if (mddev->pers) - err = do_md_stop(mddev, 2, NULL); - else - err = 0; /* already inactive */ + err = do_md_stop(mddev, 2); + break; + case clear: + err = do_md_stop(mddev, 0); break; - case suspended: - break; /* not supported yet */ case readonly: if (mddev->pers) - err = md_set_readonly(mddev, NULL); + err = md_set_readonly(mddev); else { mddev->ro = MD_RDONLY; set_disk_ro(mddev->gendisk, 1); @@ -4426,7 +4707,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) case read_auto: if (mddev->pers) { if (md_is_rdwr(mddev)) - err = md_set_readonly(mddev, NULL); + err = md_set_readonly(mddev); else if (mddev->ro == MD_RDONLY) err = restart_array(mddev); if (err == 0) { @@ -4464,10 +4745,8 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) err = do_md_run(mddev); } break; - case write_pending: - case active_idle: - case broken: - /* these cannot be set */ + default: + err = -EINVAL; break; } @@ -4477,6 +4756,11 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) sysfs_notify_dirent_safe(mddev->sysfs_state); } mddev_unlock(mddev); + + if (st == readonly || st == read_auto || st == inactive || + (err && st == clear)) + clear_bit(MD_CLOSING, &mddev->flags); + return err ?: len; } static struct md_sysfs_entry md_array_state = @@ -4497,6 +4781,8 @@ max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len 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; } @@ -4511,20 +4797,6 @@ null_show(struct mddev *mddev, char *page) return -EINVAL; } -/* need to ensure rdev_delayed_delete() has completed */ -static void flush_rdev_wq(struct mddev *mddev) -{ - struct md_rdev *rdev; - - rcu_read_lock(); - rdev_for_each_rcu(rdev, mddev) - if (work_pending(&rdev->del_work)) { - flush_workqueue(md_rdev_misc_wq); - break; - } - rcu_read_unlock(); -} - static ssize_t new_dev_store(struct mddev *mddev, const char *buf, size_t len) { @@ -4552,8 +4824,7 @@ new_dev_store(struct mddev *mddev, const char *buf, size_t len) minor != MINOR(dev)) return -EOVERFLOW; - flush_rdev_wq(mddev); - err = mddev_lock(mddev); + err = mddev_suspend_and_lock(mddev); if (err) return err; if (mddev->persistent) { @@ -4574,14 +4845,14 @@ new_dev_store(struct mddev *mddev, const char *buf, size_t len) rdev = md_import_device(dev, -1, -1); if (IS_ERR(rdev)) { - mddev_unlock(mddev); + mddev_unlock_and_resume(mddev); return PTR_ERR(rdev); } err = bind_rdev_to_array(rdev, mddev); out: if (err) - export_rdev(rdev); - mddev_unlock(mddev); + export_rdev(rdev, mddev); + mddev_unlock_and_resume(mddev); if (!err) md_new_event(); return err ? err : len; @@ -4597,6 +4868,9 @@ bitmap_store(struct mddev *mddev, const char *buf, size_t len) unsigned long chunk, end_chunk; int err; + if (!md_bitmap_enabled(mddev, false)) + return len; + err = mddev_lock(mddev); if (err) return err; @@ -4605,17 +4879,23 @@ bitmap_store(struct mddev *mddev, const char *buf, size_t len) /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ while (*buf) { chunk = end_chunk = simple_strtoul(buf, &end, 0); - if (buf == end) break; + if (buf == end) + break; + if (*end == '-') { /* range */ buf = end + 1; end_chunk = simple_strtoul(buf, &end, 0); - if (buf == end) break; + if (buf == end) + break; } - if (*end && !isspace(*end)) break; - md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); + + if (*end && !isspace(*end)) + break; + + mddev->bitmap_ops->dirty_bits(mddev, chunk, end_chunk); buf = skip_spaces(end); } - md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ + mddev->bitmap_ops->unplug(mddev, true); /* flush the bits to disk */ out: mddev_unlock(mddev); return len; @@ -4716,7 +4996,7 @@ metadata_store(struct mddev *mddev, const char *buf, size_t len) size_t namelen = len-9; if (namelen >= sizeof(mddev->metadata_type)) namelen = sizeof(mddev->metadata_type)-1; - strncpy(mddev->metadata_type, buf+9, namelen); + memcpy(mddev->metadata_type, buf+9, namelen); mddev->metadata_type[namelen] = 0; if (namelen && mddev->metadata_type[namelen-1] == '\n') mddev->metadata_type[--namelen] = 0; @@ -4750,100 +5030,296 @@ out_unlock: 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) +static bool rdev_needs_recovery(struct md_rdev *rdev, sector_t sectors) +{ + return rdev->raid_disk >= 0 && + !test_bit(Journal, &rdev->flags) && + !test_bit(Faulty, &rdev->flags) && + !test_bit(In_sync, &rdev->flags) && + rdev->recovery_offset < sectors; +} + +static enum sync_action md_get_active_sync_action(struct mddev *mddev) +{ + struct md_rdev *rdev; + bool is_recover = false; + + if (mddev->resync_offset < MaxSector) + return ACTION_RESYNC; + + if (mddev->reshape_position != MaxSector) + return ACTION_RESHAPE; + + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) { + if (rdev_needs_recovery(rdev, MaxSector)) { + is_recover = true; + break; + } + } + rcu_read_unlock(); + + return is_recover ? ACTION_RECOVER : ACTION_IDLE; +} + +enum sync_action md_sync_action(struct mddev *mddev) { - char *type = "idle"; unsigned long recovery = mddev->recovery; + enum sync_action active_action; + + /* + * frozen has the highest priority, means running sync_thread will be + * stopped immediately, and no new sync_thread can start. + */ 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 ACTION_FROZEN; + + /* + * read-only array can't register sync_thread, and it can only + * add/remove spares. + */ + if (!md_is_rdwr(mddev)) + return ACTION_IDLE; + + /* + * idle means no sync_thread is running, and no new sync_thread is + * requested. + */ + if (!test_bit(MD_RECOVERY_RUNNING, &recovery) && + !test_bit(MD_RECOVERY_NEEDED, &recovery)) + return ACTION_IDLE; + + /* + * Check if any sync operation (resync/recover/reshape) is + * currently active. This ensures that only one sync operation + * can run at a time. Returns the type of active operation, or + * ACTION_IDLE if none are active. + */ + active_action = md_get_active_sync_action(mddev); + if (active_action != ACTION_IDLE) + return active_action; + + if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) + return ACTION_RESHAPE; + + if (test_bit(MD_RECOVERY_RECOVER, &recovery)) + return ACTION_RECOVER; + + if (test_bit(MD_RECOVERY_SYNC, &recovery)) { + /* + * MD_RECOVERY_CHECK must be paired with + * MD_RECOVERY_REQUESTED. + */ + if (test_bit(MD_RECOVERY_CHECK, &recovery)) + return ACTION_CHECK; + if (test_bit(MD_RECOVERY_REQUESTED, &recovery)) + return ACTION_REPAIR; + return ACTION_RESYNC; } - return sprintf(page, "%s\n", type); + + /* + * MD_RECOVERY_NEEDED or MD_RECOVERY_RUNNING is set, however, no + * sync_action is specified. + */ + return ACTION_IDLE; +} + +enum sync_action md_sync_action_by_name(const char *page) +{ + enum sync_action action; + + for (action = 0; action < NR_SYNC_ACTIONS; ++action) { + if (cmd_match(page, action_name[action])) + return action; + } + + return NR_SYNC_ACTIONS; +} + +const char *md_sync_action_name(enum sync_action action) +{ + return action_name[action]; } static ssize_t -action_store(struct mddev *mddev, const char *page, size_t len) +action_show(struct mddev *mddev, char *page) { - if (!mddev->pers || !mddev->pers->sync_request) - return -EINVAL; + enum sync_action action = md_sync_action(mddev); + return sprintf(page, "%s\n", md_sync_action_name(action)); +} - if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { - if (cmd_match(page, "frozen")) - set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - else - clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && - mddev_lock(mddev) == 0) { - if (work_pending(&mddev->del_work)) - flush_workqueue(md_misc_wq); - if (mddev->sync_thread) { - sector_t save_rp = mddev->reshape_position; - - mddev_unlock(mddev); - set_bit(MD_RECOVERY_INTR, &mddev->recovery); - md_unregister_thread(&mddev->sync_thread); - mddev_lock_nointr(mddev); - /* - * set RECOVERY_INTR again and restore reshape - * position in case others changed them after - * got lock, eg, reshape_position_store and - * md_check_recovery. - */ - mddev->reshape_position = save_rp; - set_bit(MD_RECOVERY_INTR, &mddev->recovery); - md_reap_sync_thread(mddev); - } +/** + * stop_sync_thread() - wait for sync_thread to stop if it's running. + * @mddev: the array. + * @locked: if set, reconfig_mutex will still be held after this function + * return; if not set, reconfig_mutex will be released after this + * function return. + */ +static void stop_sync_thread(struct mddev *mddev, bool locked) +{ + int sync_seq = atomic_read(&mddev->sync_seq); + + if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { + if (!locked) mddev_unlock(mddev); - } - } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) - return -EBUSY; - else if (cmd_match(page, "resync")) + return; + } + + mddev_unlock(mddev); + + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + /* + * Thread might be blocked waiting for metadata update which will now + * never happen + */ + md_wakeup_thread_directly(&mddev->sync_thread); + if (work_pending(&mddev->sync_work)) + flush_work(&mddev->sync_work); + + wait_event(resync_wait, + !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || + (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery) && + sync_seq != atomic_read(&mddev->sync_seq))); + + if (locked) + mddev_lock_nointr(mddev); +} + +void md_idle_sync_thread(struct mddev *mddev) +{ + lockdep_assert_held(&mddev->reconfig_mutex); + + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + stop_sync_thread(mddev, true); +} +EXPORT_SYMBOL_GPL(md_idle_sync_thread); + +void md_frozen_sync_thread(struct mddev *mddev) +{ + lockdep_assert_held(&mddev->reconfig_mutex); + + set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + stop_sync_thread(mddev, true); +} +EXPORT_SYMBOL_GPL(md_frozen_sync_thread); + +void md_unfrozen_sync_thread(struct mddev *mddev) +{ + lockdep_assert_held(&mddev->reconfig_mutex); + + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + sysfs_notify_dirent_safe(mddev->sysfs_action); +} +EXPORT_SYMBOL_GPL(md_unfrozen_sync_thread); + +static int mddev_start_reshape(struct mddev *mddev) +{ + int ret; + + if (mddev->pers->start_reshape == NULL) + return -EINVAL; + + if (mddev->reshape_position == MaxSector || + mddev->pers->check_reshape == NULL || + mddev->pers->check_reshape(mddev)) { clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - else if (cmd_match(page, "recover")) { + ret = mddev->pers->start_reshape(mddev); + if (ret) + return ret; + } else { + /* + * If reshape is still in progress, and md_check_recovery() can + * continue to reshape, don't restart reshape because data can + * be corrupted for raid456. + */ 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 { - clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - err = mddev->pers->start_reshape(mddev); - } - mddev_unlock(mddev); + } + + sysfs_notify_dirent_safe(mddev->sysfs_degraded); + return 0; +} + +static ssize_t +action_store(struct mddev *mddev, const char *page, size_t len) +{ + int ret; + enum sync_action action; + + if (!mddev->pers || !mddev->pers->sync_request) + return -EINVAL; + +retry: + if (work_busy(&mddev->sync_work)) + flush_work(&mddev->sync_work); + + ret = mddev_lock(mddev); + if (ret) + return ret; + + if (work_busy(&mddev->sync_work)) { + mddev_unlock(mddev); + goto retry; + } + + action = md_sync_action_by_name(page); + + /* TODO: mdadm rely on "idle" to start sync_thread. */ + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { + switch (action) { + case ACTION_FROZEN: + md_frozen_sync_thread(mddev); + ret = len; + goto out; + case ACTION_IDLE: + md_idle_sync_thread(mddev); + break; + case ACTION_RESHAPE: + case ACTION_RECOVER: + case ACTION_CHECK: + case ACTION_REPAIR: + case ACTION_RESYNC: + ret = -EBUSY; + goto out; + default: + ret = -EINVAL; + goto out; } - if (err) - return err; - sysfs_notify_dirent_safe(mddev->sysfs_degraded); } else { - if (cmd_match(page, "check")) + switch (action) { + case ACTION_FROZEN: + set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + ret = len; + goto out; + case ACTION_RESHAPE: + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + ret = mddev_start_reshape(mddev); + if (ret) + goto out; + break; + case ACTION_RECOVER: + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + break; + case ACTION_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); + fallthrough; + case ACTION_REPAIR: + set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + set_bit(MD_RECOVERY_SYNC, &mddev->recovery); + fallthrough; + case ACTION_RESYNC: + case ACTION_IDLE: + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + break; + default: + ret = -EINVAL; + goto out; + } } + if (mddev->ro == MD_AUTO_READ) { /* A write to sync_action is enough to justify * canceling read-auto mode @@ -4851,10 +5327,15 @@ action_store(struct mddev *mddev, const char *page, size_t len) 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; + ret = len; + +out: + mddev_unlock(mddev); + return ret; } static struct md_sysfs_entry md_scan_mode = @@ -4863,7 +5344,8 @@ __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); + return sprintf(page, "%s\n", + md_sync_action_name(mddev->last_sync_action)); } static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); @@ -4882,7 +5364,7 @@ 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"); + mddev->sync_speed_min ? "local" : "system"); } static ssize_t @@ -4891,7 +5373,7 @@ sync_min_store(struct mddev *mddev, const char *buf, size_t len) unsigned int min; int rv; - if (strncmp(buf, "system", 6)==0) { + if (strncmp(buf, "system", 6) == 0) { min = 0; } else { rv = kstrtouint(buf, 10, &min); @@ -4911,7 +5393,7 @@ 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"); + mddev->sync_speed_max ? "local" : "system"); } static ssize_t @@ -4920,7 +5402,7 @@ sync_max_store(struct mddev *mddev, const char *buf, size_t len) unsigned int max; int rv; - if (strncmp(buf, "system", 6)==0) { + if (strncmp(buf, "system", 6) == 0) { max = 0; } else { rv = kstrtouint(buf, 10, &max); @@ -4937,6 +5419,35 @@ 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 +sync_io_depth_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%d (%s)\n", sync_io_depth(mddev), + mddev->sync_io_depth ? "local" : "system"); +} + +static ssize_t +sync_io_depth_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_io_depth = max; + return len; +} + +static struct md_sysfs_entry md_sync_io_depth = +__ATTR_RW(sync_io_depth); + +static ssize_t degraded_show(struct mddev *mddev, char *page) { return sprintf(page, "%d\n", mddev->degraded); @@ -5104,7 +5615,8 @@ __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); + return sprintf(page, "%llu\n", + (unsigned long long)READ_ONCE(mddev->suspend_lo)); } static ssize_t @@ -5119,21 +5631,14 @@ suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) if (new != (sector_t)new) return -EINVAL; - err = mddev_lock(mddev); + err = mddev_suspend(mddev, true); if (err) return err; - err = -EINVAL; - if (mddev->pers == NULL || - mddev->pers->quiesce == NULL) - goto unlock; - mddev_suspend(mddev); - mddev->suspend_lo = new; + + WRITE_ONCE(mddev->suspend_lo, new); mddev_resume(mddev); - err = 0; -unlock: - mddev_unlock(mddev); - return err ?: len; + return len; } static struct md_sysfs_entry md_suspend_lo = __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); @@ -5141,7 +5646,8 @@ __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); + return sprintf(page, "%llu\n", + (unsigned long long)READ_ONCE(mddev->suspend_hi)); } static ssize_t @@ -5156,21 +5662,14 @@ suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) if (new != (sector_t)new) return -EINVAL; - err = mddev_lock(mddev); + err = mddev_suspend(mddev, true); if (err) return err; - err = -EINVAL; - if (mddev->pers == NULL) - goto unlock; - mddev_suspend(mddev); - mddev->suspend_hi = new; + WRITE_ONCE(mddev->suspend_hi, new); mddev_resume(mddev); - err = 0; -unlock: - mddev_unlock(mddev); - return err ?: len; + return len; } static struct md_sysfs_entry md_suspend_hi = __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); @@ -5394,7 +5893,7 @@ __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show, static ssize_t serialize_policy_show(struct mddev *mddev, char *page) { - if (mddev->pers == NULL || (mddev->pers->level != 1)) + if (mddev->pers == NULL || (mddev->pers->head.id != ID_RAID1)) return sprintf(page, "n/a\n"); else return sprintf(page, "%d\n", mddev->serialize_policy); @@ -5417,24 +5916,22 @@ serialize_policy_store(struct mddev *mddev, const char *buf, size_t len) if (value == mddev->serialize_policy) return len; - err = mddev_lock(mddev); + err = mddev_suspend_and_lock(mddev); if (err) return err; - if (mddev->pers == NULL || (mddev->pers->level != 1)) { + if (mddev->pers == NULL || (mddev->pers->head.id != ID_RAID1)) { 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); + mddev_create_serial_pool(mddev, NULL); else - mddev_destroy_serial_pool(mddev, NULL, true); + mddev_destroy_serial_pool(mddev, NULL); mddev->serialize_policy = value; - mddev_resume(mddev); unlock: - mddev_unlock(mddev); + mddev_unlock_and_resume(mddev); return err ?: len; } @@ -5442,9 +5939,73 @@ static struct md_sysfs_entry md_serialize_policy = __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show, serialize_policy_store); +static int mddev_set_logical_block_size(struct mddev *mddev, + unsigned int lbs) +{ + int err = 0; + struct queue_limits lim; + + if (queue_logical_block_size(mddev->gendisk->queue) >= lbs) { + pr_err("%s: Cannot set LBS smaller than mddev LBS %u\n", + mdname(mddev), lbs); + return -EINVAL; + } + + lim = queue_limits_start_update(mddev->gendisk->queue); + lim.logical_block_size = lbs; + pr_info("%s: logical_block_size is changed, data may be lost\n", + mdname(mddev)); + err = queue_limits_commit_update(mddev->gendisk->queue, &lim); + if (err) + return err; + + mddev->logical_block_size = lbs; + /* New lbs will be written to superblock after array is running */ + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + return 0; +} + +static ssize_t +lbs_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%u\n", mddev->logical_block_size); +} + +static ssize_t +lbs_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned int lbs; + int err = -EBUSY; + + /* Only 1.x meta supports configurable LBS */ + if (mddev->major_version == 0) + return -EINVAL; + + if (mddev->pers) + return -EBUSY; + + err = kstrtouint(buf, 10, &lbs); + if (err < 0) + return -EINVAL; + + err = mddev_lock(mddev); + if (err) + goto unlock; + + err = mddev_set_logical_block_size(mddev, lbs); + +unlock: + mddev_unlock(mddev); + return err ?: len; +} + +static struct md_sysfs_entry md_logical_block_size = +__ATTR(logical_block_size, 0644, lbs_show, lbs_store); static struct attribute *md_default_attrs[] = { &md_level.attr, + &md_new_level.attr, + &md_bitmap_type.attr, &md_layout.attr, &md_raid_disks.attr, &md_uuid.attr, @@ -5462,6 +6023,7 @@ static struct attribute *md_default_attrs[] = { &md_consistency_policy.attr, &md_fail_last_dev.attr, &md_serialize_policy.attr, + &md_logical_block_size.attr, NULL, }; @@ -5475,6 +6037,7 @@ static struct attribute *md_redundancy_attrs[] = { &md_mismatches.attr, &md_sync_min.attr, &md_sync_max.attr, + &md_sync_io_depth.attr, &md_sync_speed.attr, &md_sync_force_parallel.attr, &md_sync_completed.attr, @@ -5493,7 +6056,6 @@ static const struct attribute_group md_redundancy_group = { static const struct attribute_group *md_attr_groups[] = { &md_default_group, - &md_bitmap_group, NULL, }; @@ -5525,19 +6087,30 @@ md_attr_store(struct kobject *kobj, struct attribute *attr, 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; + struct kernfs_node *kn = NULL; if (!entry->store) return -EIO; if (!capable(CAP_SYS_ADMIN)) return -EACCES; + + if (entry->store == array_state_store && cmd_match(page, "clear")) + kn = sysfs_break_active_protection(kobj, attr); + spin_lock(&all_mddevs_lock); if (!mddev_get(mddev)) { spin_unlock(&all_mddevs_lock); + if (kn) + sysfs_unbreak_active_protection(kn); return -EBUSY; } spin_unlock(&all_mddevs_lock); rv = entry->store(mddev, page, length); mddev_put(mddev); + + if (kn) + sysfs_unbreak_active_protection(kn); + return rv; } @@ -5545,12 +6118,13 @@ 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); + if (legacy_async_del_gendisk) { + 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); } @@ -5558,7 +6132,7 @@ static const struct sysfs_ops md_sysfs_ops = { .show = md_attr_show, .store = md_attr_store, }; -static struct kobj_type md_ktype = { +static const struct kobj_type md_ktype = { .release = md_kobj_release, .sysfs_ops = &md_sysfs_ops, .default_groups = md_attr_groups, @@ -5566,6 +6140,83 @@ static struct kobj_type md_ktype = { int mdp_major = 0; +/* stack the limit for all rdevs into lim */ +int mddev_stack_rdev_limits(struct mddev *mddev, struct queue_limits *lim, + unsigned int flags) +{ + struct md_rdev *rdev; + + rdev_for_each(rdev, mddev) { + queue_limits_stack_bdev(lim, rdev->bdev, rdev->data_offset, + mddev->gendisk->disk_name); + if ((flags & MDDEV_STACK_INTEGRITY) && + !queue_limits_stack_integrity_bdev(lim, rdev->bdev)) + return -EINVAL; + } + + /* + * Before RAID adding folio support, the logical_block_size + * should be smaller than the page size. + */ + if (lim->logical_block_size > PAGE_SIZE) { + pr_err("%s: logical_block_size must not larger than PAGE_SIZE\n", + mdname(mddev)); + return -EINVAL; + } + mddev->logical_block_size = lim->logical_block_size; + + return 0; +} +EXPORT_SYMBOL_GPL(mddev_stack_rdev_limits); + +/* apply the extra stacking limits from a new rdev into mddev */ +int mddev_stack_new_rdev(struct mddev *mddev, struct md_rdev *rdev) +{ + struct queue_limits lim; + + if (mddev_is_dm(mddev)) + return 0; + + if (queue_logical_block_size(rdev->bdev->bd_disk->queue) > + queue_logical_block_size(mddev->gendisk->queue)) { + pr_err("%s: incompatible logical_block_size, can not add\n", + mdname(mddev)); + return -EINVAL; + } + + lim = queue_limits_start_update(mddev->gendisk->queue); + queue_limits_stack_bdev(&lim, rdev->bdev, rdev->data_offset, + mddev->gendisk->disk_name); + + if (!queue_limits_stack_integrity_bdev(&lim, rdev->bdev)) { + pr_err("%s: incompatible integrity profile for %pg\n", + mdname(mddev), rdev->bdev); + queue_limits_cancel_update(mddev->gendisk->queue); + return -ENXIO; + } + + return queue_limits_commit_update(mddev->gendisk->queue, &lim); +} +EXPORT_SYMBOL_GPL(mddev_stack_new_rdev); + +/* update the optimal I/O size after a reshape */ +void mddev_update_io_opt(struct mddev *mddev, unsigned int nr_stripes) +{ + struct queue_limits lim; + + if (mddev_is_dm(mddev)) + return; + + /* don't bother updating io_opt if we can't suspend the array */ + if (mddev_suspend(mddev, false) < 0) + return; + lim = queue_limits_start_update(mddev->gendisk->queue); + lim.io_opt = lim.io_min * nr_stripes; + queue_limits_commit_update(mddev->gendisk->queue, &lim); + mddev_resume(mddev); +} +EXPORT_SYMBOL_GPL(mddev_update_io_opt); + static void mddev_delayed_delete(struct work_struct *ws) { struct mddev *mddev = container_of(ws, struct mddev, del_work); @@ -5573,20 +6224,13 @@ static void mddev_delayed_delete(struct work_struct *ws) kobject_put(&mddev->kobj); } -static void no_op(struct percpu_ref *r) {} - -int mddev_init_writes_pending(struct mddev *mddev) +void md_init_stacking_limits(struct queue_limits *lim) { - 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; - /* We want to start with the refcount at zero */ - percpu_ref_put(&mddev->writes_pending); - return 0; + blk_set_stacking_limits(lim); + lim->features = BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA | + BLK_FEAT_IO_STAT | BLK_FEAT_NOWAIT; } -EXPORT_SYMBOL_GPL(mddev_init_writes_pending); +EXPORT_SYMBOL_GPL(md_init_stacking_limits); struct mddev *md_alloc(dev_t dev, char *name) { @@ -5605,14 +6249,13 @@ struct mddev *md_alloc(dev_t dev, char *name) int partitioned; int shift; int unit; - int error ; + int error; /* * Wait for any previous instance of this device to be completely * removed (mddev_delayed_delete). */ flush_workqueue(md_misc_wq); - flush_workqueue(md_rdev_misc_wq); mutex_lock(&disks_mutex); mddev = mddev_alloc(dev); @@ -5646,10 +6289,11 @@ struct mddev *md_alloc(dev_t dev, char *name) */ mddev->hold_active = UNTIL_STOP; - error = -ENOMEM; - disk = blk_alloc_disk(NUMA_NO_NODE); - if (!disk) + disk = blk_alloc_disk(NULL, NUMA_NO_NODE); + if (IS_ERR(disk)) { + error = PTR_ERR(disk); goto out_free_mddev; + } disk->major = MAJOR(mddev->unit); disk->first_minor = unit << shift; @@ -5663,9 +6307,6 @@ struct mddev *md_alloc(dev_t dev, char *name) 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); @@ -5705,6 +6346,9 @@ static int md_alloc_and_put(dev_t dev, char *name) { struct mddev *mddev = md_alloc(dev, name); + if (legacy_async_del_gendisk) + pr_warn("md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+\n"); + if (IS_ERR(mddev)) return PTR_ERR(mddev); mddev_put(mddev); @@ -5750,7 +6394,7 @@ static int add_named_array(const char *val, const struct kernel_param *kp) static void md_safemode_timeout(struct timer_list *t) { - struct mddev *mddev = from_timer(mddev, t, safemode_timer); + struct mddev *mddev = timer_container_of(mddev, t, safemode_timer); mddev->safemode = 1; if (mddev->external) @@ -5761,6 +6405,26 @@ static void md_safemode_timeout(struct timer_list *t) static int start_dirty_degraded; +static int md_bitmap_create(struct mddev *mddev) +{ + if (mddev->bitmap_id == ID_BITMAP_NONE) + return -EINVAL; + + if (!mddev_set_bitmap_ops(mddev)) + return -ENOENT; + + return mddev->bitmap_ops->create(mddev); +} + +static void md_bitmap_destroy(struct mddev *mddev) +{ + if (!md_bitmap_registered(mddev)) + return; + + mddev->bitmap_ops->destroy(mddev); + mddev_clear_bitmap_ops(mddev); +} + int md_run(struct mddev *mddev) { int err; @@ -5807,7 +6471,7 @@ int md_run(struct mddev *mddev) invalidate_bdev(rdev->bdev); if (mddev->ro != MD_RDONLY && rdev_read_only(rdev)) { mddev->ro = MD_RDONLY; - if (mddev->gendisk) + if (!mddev_is_dm(mddev)) set_disk_ro(mddev->gendisk, 1); } @@ -5840,43 +6504,20 @@ int md_run(struct mddev *mddev) nowait = nowait && bdev_nowait(rdev->bdev); } - if (!bioset_initialized(&mddev->bio_set)) { - err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); - if (err) - return err; - } - 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; - } - - 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; + pers = get_pers(mddev->level, mddev->clevel); + if (!pers) + return -EINVAL; + if (mddev->level != pers->head.id) { + mddev->level = pers->head.id; + mddev->new_level = pers->head.id; } - strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); + strscpy(mddev->clevel, pers->head.name, sizeof(mddev->clevel)); if (mddev->reshape_position != MaxSector && pers->start_reshape == NULL) { /* This personality cannot handle reshaping... */ - module_put(pers->owner); - err = -EINVAL; - goto abort; + put_pers(pers); + return -EINVAL; } if (pers->sync_request) { @@ -5903,7 +6544,10 @@ int md_run(struct mddev *mddev) pr_warn("True protection against single-disk failure might be compromised.\n"); } - mddev->recovery = 0; + /* dm-raid expect sync_thread to be frozen until resume */ + if (mddev->gendisk) + mddev->recovery = 0; + /* may be over-ridden by personality */ mddev->resync_max_sectors = mddev->dev_sectors; @@ -5926,16 +6570,10 @@ int md_run(struct mddev *mddev) } 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); + err = md_bitmap_create(mddev); + if (err) pr_warn("%s: failed to create bitmap (%d)\n", mdname(mddev), err); - } else - mddev->bitmap = bitmap; - } if (err) goto bitmap_abort; @@ -5959,27 +6597,6 @@ int md_run(struct mddev *mddev) } } - 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); - - /* Set the NOWAIT flags if all underlying devices support it */ - 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)) @@ -6025,12 +6642,8 @@ bitmap_abort: if (mddev->private) pers->free(mddev, mddev->private); mddev->private = NULL; - module_put(pers->owner); + put_pers(pers); md_bitmap_destroy(mddev); -abort: - bioset_exit(&mddev->sync_set); -exit_bio_set: - bioset_exit(&mddev->bio_set); return err; } EXPORT_SYMBOL_GPL(md_run); @@ -6043,10 +6656,13 @@ int do_md_run(struct mddev *mddev) err = md_run(mddev); if (err) goto out; - err = md_bitmap_load(mddev); - if (err) { - md_bitmap_destroy(mddev); - goto out; + + if (md_bitmap_registered(mddev)) { + err = mddev->bitmap_ops->load(mddev); + if (err) { + md_bitmap_destroy(mddev); + goto out; + } } if (mddev_is_clustered(mddev)) @@ -6055,7 +6671,6 @@ int do_md_run(struct mddev *mddev) /* run start up tasks that require md_thread */ md_start(mddev); - md_wakeup_thread(mddev->thread); md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ set_capacity_and_notify(mddev->gendisk, mddev->array_sectors); @@ -6076,7 +6691,6 @@ int md_start(struct mddev *mddev) if (mddev->pers->start) { set_bit(MD_RECOVERY_WAIT, &mddev->recovery); - md_wakeup_thread(mddev->thread); ret = mddev->pers->start(mddev); clear_bit(MD_RECOVERY_WAIT, &mddev->recovery); md_wakeup_thread(mddev->sync_thread); @@ -6121,7 +6735,6 @@ static int restart_array(struct mddev *mddev) pr_debug("md: %s switched to read-write mode.\n", mdname(mddev)); /* Kick recovery or resync if necessary */ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - md_wakeup_thread(mddev->thread); md_wakeup_thread(mddev->sync_thread); sysfs_notify_dirent_safe(mddev->sysfs_state); return 0; @@ -6133,21 +6746,37 @@ static void md_clean(struct mddev *mddev) mddev->external_size = 0; mddev->dev_sectors = 0; mddev->raid_disks = 0; - mddev->recovery_cp = 0; + mddev->resync_offset = 0; mddev->resync_min = 0; mddev->resync_max = MaxSector; mddev->reshape_position = MaxSector; - mddev->external = 0; + /* we still need mddev->external in export_rdev, do not clear it yet */ mddev->persistent = 0; mddev->level = LEVEL_NONE; mddev->clevel[0] = 0; - mddev->flags = 0; + + /* + * For legacy_async_del_gendisk mode, it can stop the array in the + * middle of assembling it, then it still can access the array. So + * it needs to clear MD_CLOSING. If not legacy_async_del_gendisk, + * it can't open the array again after stopping it. So it doesn't + * clear MD_CLOSING. + */ + if (legacy_async_del_gendisk && mddev->hold_active) { + clear_bit(MD_CLOSING, &mddev->flags); + } else { + /* if UNTIL_STOP is set, it's cleared here */ + mddev->hold_active = 0; + /* Don't clear MD_CLOSING, or mddev can be opened again. */ + mddev->flags &= BIT_ULL_MASK(MD_CLOSING); + } mddev->sb_flags = 0; mddev->ro = MD_RDWR; mddev->metadata_type[0] = 0; mddev->chunk_sectors = 0; mddev->ctime = mddev->utime = 0; mddev->layout = 0; + mddev->logical_block_size = 0; mddev->max_disks = 0; mddev->events = 0; mddev->can_decrease_events = 0; @@ -6156,7 +6785,7 @@ static void md_clean(struct mddev *mddev) mddev->new_level = LEVEL_NONE; mddev->new_layout = 0; mddev->new_chunk_sectors = 0; - mddev->curr_resync = 0; + mddev->curr_resync = MD_RESYNC_NONE; atomic64_set(&mddev->resync_mismatches, 0); mddev->suspend_lo = mddev->suspend_hi = 0; mddev->sync_speed_min = mddev->sync_speed_max = 0; @@ -6178,22 +6807,15 @@ static void md_clean(struct mddev *mddev) static void __md_stop_writes(struct mddev *mddev) { - set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - if (work_pending(&mddev->del_work)) - flush_workqueue(md_misc_wq); - if (mddev->sync_thread) { - set_bit(MD_RECOVERY_INTR, &mddev->recovery); - md_unregister_thread(&mddev->sync_thread); - md_reap_sync_thread(mddev); - } - - del_timer_sync(&mddev->safemode_timer); + timer_delete_sync(&mddev->safemode_timer); if (mddev->pers && mddev->pers->quiesce) { mddev->pers->quiesce(mddev, 1); mddev->pers->quiesce(mddev, 0); } - md_bitmap_flush(mddev); + + if (md_bitmap_enabled(mddev, true)) + mddev->bitmap_ops->flush(mddev); if (md_is_rdwr(mddev) && ((!mddev->in_sync && !mddev_is_clustered(mddev)) || @@ -6205,12 +6827,14 @@ static void __md_stop_writes(struct mddev *mddev) } /* disable policy to guarantee rdevs free resources for serialization */ mddev->serialize_policy = 0; - mddev_destroy_serial_pool(mddev, NULL, true); + mddev_destroy_serial_pool(mddev, NULL); } void md_stop_writes(struct mddev *mddev) { mddev_lock_nointr(mddev); + set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + stop_sync_thread(mddev, true); __md_stop_writes(mddev); mddev_unlock(mddev); } @@ -6218,104 +6842,90 @@ EXPORT_SYMBOL_GPL(md_stop_writes); static void mddev_detach(struct mddev *mddev) { - md_bitmap_wait_behind_writes(mddev); - if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) { + if (md_bitmap_enabled(mddev, false)) + mddev->bitmap_ops->wait_behind_writes(mddev); + if (mddev->pers && mddev->pers->quiesce && !is_md_suspended(mddev)) { mddev->pers->quiesce(mddev, 1); mddev->pers->quiesce(mddev, 0); } - md_unregister_thread(&mddev->thread); - if (mddev->queue) - blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ + md_unregister_thread(mddev, &mddev->thread); + + /* the unplug fn references 'conf' */ + if (!mddev_is_dm(mddev)) + blk_sync_queue(mddev->gendisk->queue); } static void __md_stop(struct mddev *mddev) { struct md_personality *pers = mddev->pers; + md_bitmap_destroy(mddev); mddev_detach(mddev); - /* Ensure ->event_work is done */ - if (mddev->event_work.func) - flush_workqueue(md_misc_wq); spin_lock(&mddev->lock); mddev->pers = NULL; spin_unlock(&mddev->lock); if (mddev->private) pers->free(mddev, mddev->private); mddev->private = NULL; - if (pers->sync_request && mddev->to_remove == NULL) - mddev->to_remove = &md_redundancy_group; - module_put(pers->owner); + put_pers(pers); clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); } void md_stop(struct mddev *mddev) { + lockdep_assert_held(&mddev->reconfig_mutex); + /* stop the array and free an attached data structures. * This is called from dm-raid */ __md_stop_writes(mddev); __md_stop(mddev); - bioset_exit(&mddev->bio_set); - bioset_exit(&mddev->sync_set); } EXPORT_SYMBOL_GPL(md_stop); -static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) +/* ensure 'mddev->pers' exist before calling md_set_readonly() */ +static int md_set_readonly(struct mddev *mddev) { int err = 0; int did_freeze = 0; + if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) + return -EBUSY; + if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { did_freeze = 1; set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - md_wakeup_thread(mddev->thread); } - if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) - set_bit(MD_RECOVERY_INTR, &mddev->recovery); - if (mddev->sync_thread) - /* Thread might be blocked waiting for metadata update - * which will now never happen */ - wake_up_process(mddev->sync_thread->tsk); - if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) - return -EBUSY; - mddev_unlock(mddev); - wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, - &mddev->recovery)); + stop_sync_thread(mddev, false); wait_event(mddev->sb_wait, !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); mddev_lock_nointr(mddev); - mutex_lock(&mddev->open_mutex); - if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || - mddev->sync_thread || - test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { pr_warn("md: %s still in use.\n",mdname(mddev)); - if (did_freeze) { - clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - md_wakeup_thread(mddev->thread); - } err = -EBUSY; goto out; } - if (mddev->pers) { - __md_stop_writes(mddev); + __md_stop_writes(mddev); + + if (mddev->ro == MD_RDONLY) { err = -ENXIO; - if (mddev->ro == MD_RDONLY) - goto out; - mddev->ro = MD_RDONLY; - set_disk_ro(mddev->gendisk, 1); + goto out; + } + + mddev->ro = MD_RDONLY; + set_disk_ro(mddev->gendisk, 1); + +out: + if (!err || did_freeze) { clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - md_wakeup_thread(mddev->thread); sysfs_notify_dirent_safe(mddev->sysfs_state); - err = 0; } -out: - mutex_unlock(&mddev->open_mutex); + return err; } @@ -6323,8 +6933,7 @@ out: * 0 - completely stop and dis-assemble array * 2 - stop but do not disassemble array */ -static int do_md_stop(struct mddev *mddev, int mode, - struct block_device *bdev) +static int do_md_stop(struct mddev *mddev, int mode) { struct gendisk *disk = mddev->gendisk; struct md_rdev *rdev; @@ -6333,32 +6942,16 @@ static int do_md_stop(struct mddev *mddev, int mode, if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { did_freeze = 1; set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - md_wakeup_thread(mddev->thread); } - if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) - set_bit(MD_RECOVERY_INTR, &mddev->recovery); - if (mddev->sync_thread) - /* Thread might be blocked waiting for metadata update - * which will now never happen */ - wake_up_process(mddev->sync_thread->tsk); - mddev_unlock(mddev); - wait_event(resync_wait, (mddev->sync_thread == NULL && - !test_bit(MD_RECOVERY_RUNNING, - &mddev->recovery))); - mddev_lock_nointr(mddev); + stop_sync_thread(mddev, true); - mutex_lock(&mddev->open_mutex); - if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || - mddev->sysfs_active || - mddev->sync_thread || + if (mddev->sysfs_active || test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { pr_warn("md: %s still in use.\n",mdname(mddev)); - mutex_unlock(&mddev->open_mutex); if (did_freeze) { clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - md_wakeup_thread(mddev->thread); } return -EBUSY; } @@ -6366,6 +6959,10 @@ static int do_md_stop(struct mddev *mddev, int mode, if (!md_is_rdwr(mddev)) set_disk_ro(disk, 0); + if (mode == 2 && mddev->pers->sync_request && + mddev->to_remove == NULL) + mddev->to_remove = &md_redundancy_group; + __md_stop_writes(mddev); __md_stop(mddev); @@ -6377,13 +6974,11 @@ static int do_md_stop(struct mddev *mddev, int mode, sysfs_unlink_rdev(mddev, rdev); set_capacity_and_notify(disk, 0); - mutex_unlock(&mddev->open_mutex); mddev->changed = 1; if (!md_is_rdwr(mddev)) mddev->ro = MD_RDWR; - } else - mutex_unlock(&mddev->open_mutex); + } /* * Free resources if final stop */ @@ -6400,10 +6995,9 @@ static int do_md_stop(struct mddev *mddev, int mode, mddev->bitmap_info.offset = 0; export_array(mddev); - md_clean(mddev); - if (mddev->hold_active == UNTIL_STOP) - mddev->hold_active = 0; + if (!legacy_async_del_gendisk) + set_bit(MD_DELETED, &mddev->flags); } md_new_event(); sysfs_notify_dirent_safe(mddev->sysfs_state); @@ -6429,7 +7023,7 @@ static void autorun_array(struct mddev *mddev) err = do_md_run(mddev); if (err) { pr_warn("md: do_md_run() returned %d\n", err); - do_md_stop(mddev, 0, NULL); + do_md_stop(mddev, 0); } } @@ -6489,30 +7083,30 @@ static void autorun_devices(int part) if (IS_ERR(mddev)) break; - if (mddev_lock(mddev)) + if (mddev_suspend_and_lock(mddev)) pr_warn("md: %s locked, cannot run\n", mdname(mddev)); else if (mddev->raid_disks || mddev->major_version || !list_empty(&mddev->disks)) { pr_warn("md: %s already running, cannot run %pg\n", mdname(mddev), rdev0->bdev); - mddev_unlock(mddev); + mddev_unlock_and_resume(mddev); } else { pr_debug("md: created %s\n", mdname(mddev)); mddev->persistent = 1; rdev_for_each_list(rdev, tmp, &candidates) { list_del_init(&rdev->same_set); if (bind_rdev_to_array(rdev, mddev)) - export_rdev(rdev); + export_rdev(rdev, mddev); } autorun_array(mddev); - mddev_unlock(mddev); + mddev_unlock_and_resume(mddev); } /* on success, candidates will be empty, on error * it won't... */ rdev_for_each_list(rdev, tmp, &candidates) { list_del_init(&rdev->same_set); - export_rdev(rdev); + export_rdev(rdev, mddev); } mddev_put(mddev); } @@ -6700,13 +7294,13 @@ int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info) pr_warn("md: %pg has different UUID to %pg\n", rdev->bdev, rdev0->bdev); - export_rdev(rdev); + export_rdev(rdev, mddev); return -EINVAL; } } err = bind_rdev_to_array(rdev, mddev); if (err) - export_rdev(rdev); + export_rdev(rdev, mddev); return err; } @@ -6737,20 +7331,19 @@ int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info) if (info->state & (1<<MD_DISK_SYNC) && info->raid_disk < mddev->raid_disks) { rdev->raid_disk = info->raid_disk; - set_bit(In_sync, &rdev->flags); clear_bit(Bitmap_sync, &rdev->flags); } else rdev->raid_disk = -1; rdev->saved_raid_disk = rdev->raid_disk; } else super_types[mddev->major_version]. - validate_super(mddev, rdev); + validate_super(mddev, NULL/*freshest*/, rdev); if ((info->state & (1<<MD_DISK_SYNC)) && rdev->raid_disk != info->raid_disk) { /* This was a hot-add request, but events doesn't * match, so reject it. */ - export_rdev(rdev); + export_rdev(rdev, mddev); return -EINVAL; } @@ -6776,7 +7369,7 @@ int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info) } } if (has_journal || mddev->bitmap) { - export_rdev(rdev); + export_rdev(rdev, mddev); return -EBUSY; } set_bit(Journal, &rdev->flags); @@ -6789,9 +7382,9 @@ int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info) set_bit(Candidate, &rdev->flags); else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { /* --add initiated by this node */ - err = md_cluster_ops->add_new_disk(mddev, rdev); + err = mddev->cluster_ops->add_new_disk(mddev, rdev); if (err) { - export_rdev(rdev); + export_rdev(rdev, mddev); return err; } } @@ -6801,19 +7394,19 @@ int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info) err = bind_rdev_to_array(rdev, mddev); if (err) - export_rdev(rdev); + export_rdev(rdev, mddev); if (mddev_is_clustered(mddev)) { if (info->state & (1 << MD_DISK_CANDIDATE)) { if (!err) { - err = md_cluster_ops->new_disk_ack(mddev, - err == 0); + err = mddev->cluster_ops->new_disk_ack( + mddev, err == 0); if (err) md_kick_rdev_from_array(rdev); } } else { if (err) - md_cluster_ops->add_new_disk_cancel(mddev); + mddev->cluster_ops->add_new_disk_cancel(mddev); else err = add_bound_rdev(rdev); } @@ -6864,7 +7457,7 @@ int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info) err = bind_rdev_to_array(rdev, mddev); if (err) { - export_rdev(rdev); + export_rdev(rdev, mddev); return err; } } @@ -6893,16 +7486,13 @@ static int hot_remove_disk(struct mddev *mddev, dev_t dev) goto busy; kick_rdev: - if (mddev_is_clustered(mddev)) { - if (md_cluster_ops->remove_disk(mddev, rdev)) - goto busy; - } + if (mddev_is_clustered(mddev) && + mddev->cluster_ops->remove_disk(mddev, rdev)) + goto busy; md_kick_rdev_from_array(rdev); set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); - if (mddev->thread) - md_wakeup_thread(mddev->thread); - else + if (!mddev->thread) md_update_sb(mddev, 1); md_new_event(); @@ -6971,25 +7561,15 @@ static int hot_add_disk(struct mddev *mddev, dev_t dev) if (!mddev->thread) md_update_sb(mddev, 1); /* - * If the new disk does not support REQ_NOWAIT, - * disable on the whole MD. - */ - if (!bdev_nowait(rdev->bdev)) { - pr_info("%s: Disabling nowait because %pg does not support nowait\n", - mdname(mddev), rdev->bdev); - blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, mddev->queue); - } - /* * Kick recovery, maybe this spare has to be added to the * array immediately. */ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - md_wakeup_thread(mddev->thread); md_new_event(); return 0; abort_export: - export_rdev(rdev); + export_rdev(rdev, mddev); return err; } @@ -6997,6 +7577,9 @@ static int set_bitmap_file(struct mddev *mddev, int fd) { int err = 0; + if (!md_bitmap_registered(mddev)) + return -EINVAL; + if (mddev->pers) { if (!mddev->pers->quiesce || !mddev->thread) return -EBUSY; @@ -7011,6 +7594,15 @@ static int set_bitmap_file(struct mddev *mddev, int fd) if (mddev->bitmap || mddev->bitmap_info.file) return -EEXIST; /* cannot add when bitmap is present */ + + if (!IS_ENABLED(CONFIG_MD_BITMAP_FILE)) { + pr_warn("%s: bitmap files not supported by this kernel\n", + mdname(mddev)); + return -EINVAL; + } + pr_warn("%s: using deprecated bitmap file support\n", + mdname(mddev)); + f = fget(fd); if (f == NULL) { @@ -7044,26 +7636,19 @@ static int set_bitmap_file(struct mddev *mddev, int fd) err = 0; if (mddev->pers) { if (fd >= 0) { - struct bitmap *bitmap; + err = md_bitmap_create(mddev); + if (!err) + err = mddev->bitmap_ops->load(mddev); - bitmap = md_bitmap_create(mddev, -1); - mddev_suspend(mddev); - if (!IS_ERR(bitmap)) { - mddev->bitmap = bitmap; - err = md_bitmap_load(mddev); - } else - err = PTR_ERR(bitmap); if (err) { md_bitmap_destroy(mddev); fd = -1; } - mddev_resume(mddev); } else if (fd < 0) { - mddev_suspend(mddev); md_bitmap_destroy(mddev); - mddev_resume(mddev); } } + if (fd < 0) { struct file *f = mddev->bitmap_info.file; if (f) { @@ -7125,9 +7710,9 @@ int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info) * openned */ if (info->state & (1<<MD_SB_CLEAN)) - mddev->recovery_cp = MaxSector; + mddev->resync_offset = MaxSector; else - mddev->recovery_cp = 0; + mddev->resync_offset = 0; mddev->persistent = ! info->not_persistent; mddev->external = 0; @@ -7193,8 +7778,7 @@ static int update_size(struct mddev *mddev, sector_t num_sectors) * of each device. If num_sectors is zero, we find the largest size * that fits. */ - if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || - mddev->sync_thread) + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) return -EBUSY; if (!md_is_rdwr(mddev)) return -EROFS; @@ -7210,11 +7794,10 @@ static int update_size(struct mddev *mddev, sector_t num_sectors) rv = mddev->pers->resize(mddev, num_sectors); if (!rv) { if (mddev_is_clustered(mddev)) - md_cluster_ops->update_size(mddev, old_dev_sectors); - else if (mddev->queue) { + mddev->cluster_ops->update_size(mddev, old_dev_sectors); + else if (!mddev_is_dm(mddev)) set_capacity_and_notify(mddev->gendisk, mddev->array_sectors); - } } return rv; } @@ -7231,8 +7814,7 @@ static int update_raid_disks(struct mddev *mddev, int raid_disks) if (raid_disks <= 0 || (mddev->max_disks && raid_disks >= mddev->max_disks)) return -EINVAL; - if (mddev->sync_thread || - test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) || mddev->reshape_position != MaxSector) return -EBUSY; @@ -7260,6 +7842,28 @@ static int update_raid_disks(struct mddev *mddev, int raid_disks) return rv; } +static int get_cluster_ops(struct mddev *mddev) +{ + xa_lock(&md_submodule); + mddev->cluster_ops = xa_load(&md_submodule, ID_CLUSTER); + if (mddev->cluster_ops && + !try_module_get(mddev->cluster_ops->head.owner)) + mddev->cluster_ops = NULL; + xa_unlock(&md_submodule); + + return mddev->cluster_ops == NULL ? -ENOENT : 0; +} + +static void put_cluster_ops(struct mddev *mddev) +{ + if (!mddev->cluster_ops) + return; + + mddev->cluster_ops->leave(mddev); + module_put(mddev->cluster_ops->head.owner); + mddev->cluster_ops = NULL; +} + /* * update_array_info is used to change the configuration of an * on-line array. @@ -7335,7 +7939,6 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) goto err; } if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { - struct bitmap *bitmap; /* add the bitmap */ if (mddev->bitmap) { rv = -EEXIST; @@ -7349,43 +7952,38 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) mddev->bitmap_info.default_offset; mddev->bitmap_info.space = mddev->bitmap_info.default_space; - bitmap = md_bitmap_create(mddev, -1); - mddev_suspend(mddev); - if (!IS_ERR(bitmap)) { - mddev->bitmap = bitmap; - rv = md_bitmap_load(mddev); - } else - rv = PTR_ERR(bitmap); + rv = md_bitmap_create(mddev); + if (!rv) + rv = mddev->bitmap_ops->load(mddev); + if (rv) md_bitmap_destroy(mddev); - mddev_resume(mddev); } else { - /* remove the bitmap */ - if (!mddev->bitmap) { - rv = -ENOENT; + struct md_bitmap_stats stats; + + rv = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats); + if (rv) goto err; - } - if (mddev->bitmap->storage.file) { + + if (stats.file) { rv = -EINVAL; goto err; } + if (mddev->bitmap_info.nodes) { /* hold PW on all the bitmap lock */ - if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) { + if (mddev->cluster_ops->lock_all_bitmaps(mddev) <= 0) { pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n"); rv = -EPERM; - md_cluster_ops->unlock_all_bitmaps(mddev); + mddev->cluster_ops->unlock_all_bitmaps(mddev); goto err; } mddev->bitmap_info.nodes = 0; - md_cluster_ops->leave(mddev); - module_put(md_cluster_mod); + put_cluster_ops(mddev); mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY; } - mddev_suspend(mddev); md_bitmap_destroy(mddev); - mddev_resume(mddev); mddev->bitmap_info.offset = 0; } } @@ -7422,9 +8020,9 @@ static int set_disk_faulty(struct mddev *mddev, dev_t dev) * 4 sectors (with a BIG number of cylinders...). This drives * dosfs just mad... ;-) */ -static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) +static int md_getgeo(struct gendisk *disk, struct hd_geometry *geo) { - struct mddev *mddev = bdev->bd_disk->private_data; + struct mddev *mddev = disk->private_data; geo->heads = 2; geo->sectors = 4; @@ -7432,16 +8030,17 @@ static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) return 0; } -static inline bool md_ioctl_valid(unsigned int cmd) +static inline int md_ioctl_valid(unsigned int cmd) { switch (cmd) { - case ADD_NEW_DISK: case GET_ARRAY_INFO: - case GET_BITMAP_FILE: case GET_DISK_INFO: + case RAID_VERSION: + return 0; + case ADD_NEW_DISK: + case GET_BITMAP_FILE: case HOT_ADD_DISK: case HOT_REMOVE_DISK: - case RAID_VERSION: case RESTART_ARRAY_RW: case RUN_ARRAY: case SET_ARRAY_INFO: @@ -7450,6 +8049,22 @@ static inline bool md_ioctl_valid(unsigned int cmd) case STOP_ARRAY: case STOP_ARRAY_RO: case CLUSTERED_DISK_NACK: + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + return 0; + default: + return -ENOTTY; + } +} + +static bool md_ioctl_need_suspend(unsigned int cmd) +{ + switch (cmd) { + case ADD_NEW_DISK: + case HOT_ADD_DISK: + case HOT_REMOVE_DISK: + case SET_BITMAP_FILE: + case SET_ARRAY_INFO: return true; default: return false; @@ -7490,37 +8105,23 @@ static int __md_set_array_info(struct mddev *mddev, void __user *argp) return err; } -static int md_ioctl(struct block_device *bdev, fmode_t mode, +static int md_ioctl(struct block_device *bdev, blk_mode_t mode, unsigned int cmd, unsigned long arg) { int err = 0; void __user *argp = (void __user *)arg; struct mddev *mddev = NULL; - bool did_set_md_closing = false; - - if (!md_ioctl_valid(cmd)) - return -ENOTTY; - switch (cmd) { - case RAID_VERSION: - case GET_ARRAY_INFO: - case GET_DISK_INFO: - break; - default: - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; - } + err = md_ioctl_valid(cmd); + if (err) + return err; /* * Commands dealing with the RAID driver but not any * particular array: */ - switch (cmd) { - case RAID_VERSION: - err = get_version(argp); - goto out; - default:; - } + if (cmd == RAID_VERSION) + return get_version(argp); /* * Commands creating/starting a new array: @@ -7528,66 +8129,39 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode, mddev = bdev->bd_disk->private_data; - if (!mddev) { - BUG(); - goto out; - } - /* Some actions do not requires the mutex */ switch (cmd) { case GET_ARRAY_INFO: if (!mddev->raid_disks && !mddev->external) - err = -ENODEV; - else - err = get_array_info(mddev, argp); - goto out; + return -ENODEV; + return get_array_info(mddev, argp); case GET_DISK_INFO: if (!mddev->raid_disks && !mddev->external) - err = -ENODEV; - else - err = get_disk_info(mddev, argp); - goto out; + return -ENODEV; + return get_disk_info(mddev, argp); case SET_DISK_FAULTY: - err = set_disk_faulty(mddev, new_decode_dev(arg)); - goto out; + return set_disk_faulty(mddev, new_decode_dev(arg)); case GET_BITMAP_FILE: - err = get_bitmap_file(mddev, argp); - goto out; - + return get_bitmap_file(mddev, argp); } - if (cmd == ADD_NEW_DISK || cmd == HOT_ADD_DISK) - flush_rdev_wq(mddev); - - if (cmd == HOT_REMOVE_DISK) - /* need to ensure recovery thread has run */ - wait_event_interruptible_timeout(mddev->sb_wait, - !test_bit(MD_RECOVERY_NEEDED, - &mddev->recovery), - msecs_to_jiffies(5000)); if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { /* Need to flush page cache, and ensure no-one else opens * and writes */ - mutex_lock(&mddev->open_mutex); - if (mddev->pers && atomic_read(&mddev->openers) > 1) { - mutex_unlock(&mddev->open_mutex); - err = -EBUSY; - goto out; - } - if (test_and_set_bit(MD_CLOSING, &mddev->flags)) { - mutex_unlock(&mddev->open_mutex); - err = -EBUSY; - goto out; - } - did_set_md_closing = true; - mutex_unlock(&mddev->open_mutex); - sync_blockdev(bdev); + err = mddev_set_closing_and_sync_blockdev(mddev, 1); + if (err) + return err; } - err = mddev_lock(mddev); + + if (!md_is_rdwr(mddev)) + flush_work(&mddev->sync_work); + + err = md_ioctl_need_suspend(cmd) ? mddev_suspend_and_lock(mddev) : + mddev_lock(mddev); if (err) { pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n", err, cmd); @@ -7621,11 +8195,12 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode, goto unlock; case STOP_ARRAY: - err = do_md_stop(mddev, 0, bdev); + err = do_md_stop(mddev, 0); goto unlock; case STOP_ARRAY_RO: - err = md_set_readonly(mddev, bdev); + if (mddev->pers) + err = md_set_readonly(mddev); goto unlock; case HOT_REMOVE_DISK: @@ -7689,7 +8264,7 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode, case CLUSTERED_DISK_NACK: if (mddev_is_clustered(mddev)) - md_cluster_ops->new_disk_ack(mddev, false); + mddev->cluster_ops->new_disk_ack(mddev, false); else err = -EINVAL; goto unlock; @@ -7715,14 +8290,17 @@ unlock: if (mddev->hold_active == UNTIL_IOCTL && err != -EINVAL) mddev->hold_active = 0; - mddev_unlock(mddev); + + md_ioctl_need_suspend(cmd) ? mddev_unlock_and_resume(mddev) : + mddev_unlock(mddev); + out: - if(did_set_md_closing) + if (cmd == STOP_ARRAY_RO || (err && cmd == STOP_ARRAY)) clear_bit(MD_CLOSING, &mddev->flags); return err; } #ifdef CONFIG_COMPAT -static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, +static int md_compat_ioctl(struct block_device *bdev, blk_mode_t mode, unsigned int cmd, unsigned long arg) { switch (cmd) { @@ -7771,13 +8349,13 @@ out_unlock: return err; } -static int md_open(struct block_device *bdev, fmode_t mode) +static int md_open(struct gendisk *disk, blk_mode_t mode) { struct mddev *mddev; int err; spin_lock(&all_mddevs_lock); - mddev = mddev_get(bdev->bd_disk->private_data); + mddev = mddev_get(disk->private_data); spin_unlock(&all_mddevs_lock); if (!mddev) return -ENODEV; @@ -7793,7 +8371,7 @@ static int md_open(struct block_device *bdev, fmode_t mode) atomic_inc(&mddev->openers); mutex_unlock(&mddev->open_mutex); - bdev_check_media_change(bdev); + disk_check_media_change(disk); return 0; out_unlock: @@ -7803,7 +8381,7 @@ out: return err; } -static void md_release(struct gendisk *disk, fmode_t mode) +static void md_release(struct gendisk *disk) { struct mddev *mddev = disk->private_data; @@ -7827,10 +8405,6 @@ static void md_free_disk(struct gendisk *disk) { struct mddev *mddev = disk->private_data; - percpu_ref_exit(&mddev->writes_pending); - bioset_exit(&mddev->bio_set); - bioset_exit(&mddev->sync_set); - mddev_free(mddev); } @@ -7893,15 +8467,30 @@ static int md_thread(void *arg) return 0; } -void md_wakeup_thread(struct md_thread *thread) +static void md_wakeup_thread_directly(struct md_thread __rcu **thread) +{ + struct md_thread *t; + + rcu_read_lock(); + t = rcu_dereference(*thread); + if (t) + wake_up_process(t->tsk); + rcu_read_unlock(); +} + +void __md_wakeup_thread(struct md_thread __rcu *thread) { - if (thread) { - pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); - set_bit(THREAD_WAKEUP, &thread->flags); - wake_up(&thread->wqueue); + struct md_thread *t; + + t = rcu_dereference(thread); + if (t) { + pr_debug("md: waking up MD thread %s.\n", t->tsk->comm); + set_bit(THREAD_WAKEUP, &t->flags); + if (wq_has_sleeper(&t->wqueue)) + wake_up(&t->wqueue); } } -EXPORT_SYMBOL(md_wakeup_thread); +EXPORT_SYMBOL(__md_wakeup_thread); struct md_thread *md_register_thread(void (*run) (struct md_thread *), struct mddev *mddev, const char *name) @@ -7929,22 +8518,16 @@ struct md_thread *md_register_thread(void (*run) (struct md_thread *), } EXPORT_SYMBOL(md_register_thread); -void md_unregister_thread(struct md_thread **threadp) +void md_unregister_thread(struct mddev *mddev, struct md_thread __rcu **threadp) { - struct md_thread *thread; + struct md_thread *thread = rcu_dereference_protected(*threadp, + lockdep_is_held(&mddev->reconfig_mutex)); - /* - * Locking ensures that mddev_unlock does not wake_up a - * non-existent thread - */ - spin_lock(&pers_lock); - thread = *threadp; - if (!thread) { - spin_unlock(&pers_lock); + if (!thread) return; - } - *threadp = NULL; - spin_unlock(&pers_lock); + + rcu_assign_pointer(*threadp, NULL); + synchronize_rcu(); pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); kthread_stop(thread->tsk); @@ -7961,6 +8544,10 @@ void md_error(struct mddev *mddev, struct md_rdev *rdev) return; mddev->pers->error_handler(mddev, rdev); + if (mddev->pers->head.id == ID_RAID0 || + mddev->pers->head.id == ID_LINEAR) + return; + if (mddev->degraded && !test_bit(MD_BROKEN, &mddev->flags)) set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); sysfs_notify_dirent_safe(rdev->sysfs_state); @@ -7994,6 +8581,22 @@ static void status_unused(struct seq_file *seq) seq_printf(seq, "\n"); } +static void status_personalities(struct seq_file *seq) +{ + struct md_submodule_head *head; + unsigned long i; + + seq_puts(seq, "Personalities : "); + + xa_lock(&md_submodule); + xa_for_each(&md_submodule, i, head) + if (head->type == MD_PERSONALITY) + seq_printf(seq, "[%s] ", head->name); + xa_unlock(&md_submodule); + + seq_puts(seq, "\n"); +} + static int status_resync(struct seq_file *seq, struct mddev *mddev) { sector_t max_sectors, resync, res; @@ -8016,16 +8619,16 @@ static int status_resync(struct seq_file *seq, struct mddev *mddev) } else if (resync > max_sectors) { resync = max_sectors; } else { - resync -= atomic_read(&mddev->recovery_active); - if (resync < MD_RESYNC_ACTIVE) { - /* - * Resync has started, but the subtraction has - * yielded one of the special values. Force it - * to active to ensure the status reports an - * active resync. - */ + res = atomic_read(&mddev->recovery_active); + /* + * Resync has started, but the subtraction has overflowed or + * yielded one of the special values. Force it to active to + * ensure the status reports an active resync. + */ + if (resync < res || resync - res < MD_RESYNC_ACTIVE) resync = MD_RESYNC_ACTIVE; - } + else + resync -= res; } if (resync == MD_RESYNC_NONE) { @@ -8046,7 +8649,7 @@ static int status_resync(struct seq_file *seq, struct mddev *mddev) seq_printf(seq, "\tresync=REMOTE"); return 1; } - if (mddev->recovery_cp < MaxSector) { + if (mddev->resync_offset < MaxSector) { seq_printf(seq, "\tresync=PENDING"); return 1; } @@ -8133,115 +8736,92 @@ static int status_resync(struct seq_file *seq, struct mddev *mddev) } static void *md_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(&all_mddevs_lock) { - struct list_head *tmp; - loff_t l = *pos; - struct mddev *mddev; - - if (l == 0x10000) { - ++*pos; - return (void *)2; - } - if (l > 0x10000) - return NULL; - if (!l--) - /* header */ - return (void*)1; - + seq->poll_event = atomic_read(&md_event_count); spin_lock(&all_mddevs_lock); - list_for_each(tmp,&all_mddevs) - if (!l--) { - mddev = list_entry(tmp, struct mddev, all_mddevs); - if (!mddev_get(mddev)) - continue; - spin_unlock(&all_mddevs_lock); - return mddev; - } - spin_unlock(&all_mddevs_lock); - if (!l--) - return (void*)2;/* tail */ - return NULL; + + return seq_list_start_head(&all_mddevs, *pos); } static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) { - struct list_head *tmp; - struct mddev *next_mddev, *mddev = v; - struct mddev *to_put = NULL; + return seq_list_next(v, &all_mddevs, pos); +} + +static void md_seq_stop(struct seq_file *seq, void *v) + __releases(&all_mddevs_lock) +{ + spin_unlock(&all_mddevs_lock); +} - ++*pos; - if (v == (void*)2) - return NULL; +static void md_bitmap_status(struct seq_file *seq, struct mddev *mddev) +{ + struct md_bitmap_stats stats; + unsigned long used_pages; + unsigned long chunk_kb; + int err; - spin_lock(&all_mddevs_lock); - if (v == (void*)1) { - tmp = all_mddevs.next; - } else { - to_put = mddev; - tmp = mddev->all_mddevs.next; - } + if (!md_bitmap_enabled(mddev, false)) + return; - for (;;) { - if (tmp == &all_mddevs) { - next_mddev = (void*)2; - *pos = 0x10000; - break; - } - next_mddev = list_entry(tmp, struct mddev, all_mddevs); - if (mddev_get(next_mddev)) - break; - mddev = next_mddev; - tmp = mddev->all_mddevs.next; - } - spin_unlock(&all_mddevs_lock); + err = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats); + if (err) + return; - if (to_put) - mddev_put(mddev); - return next_mddev; + chunk_kb = mddev->bitmap_info.chunksize >> 10; + used_pages = stats.pages - stats.missing_pages; -} + seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], %lu%s chunk", + used_pages, stats.pages, used_pages << (PAGE_SHIFT - 10), + chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, + chunk_kb ? "KB" : "B"); -static void md_seq_stop(struct seq_file *seq, void *v) -{ - struct mddev *mddev = v; + if (stats.file) { + seq_puts(seq, ", file: "); + seq_file_path(seq, stats.file, " \t\n"); + } - if (mddev && v != (void*)1 && v != (void*)2) - mddev_put(mddev); + seq_putc(seq, '\n'); } static int md_seq_show(struct seq_file *seq, void *v) { - struct mddev *mddev = v; + struct mddev *mddev; sector_t sectors; struct md_rdev *rdev; - if (v == (void*)1) { - struct md_personality *pers; - seq_printf(seq, "Personalities : "); - spin_lock(&pers_lock); - list_for_each_entry(pers, &pers_list, list) - seq_printf(seq, "[%s] ", pers->name); - - spin_unlock(&pers_lock); - seq_printf(seq, "\n"); - seq->poll_event = atomic_read(&md_event_count); + if (v == &all_mddevs) { + status_personalities(seq); + if (list_empty(&all_mddevs)) + status_unused(seq); return 0; } - if (v == (void*)2) { - status_unused(seq); + + mddev = list_entry(v, struct mddev, all_mddevs); + if (!mddev_get(mddev)) return 0; - } + + spin_unlock(&all_mddevs_lock); + + /* prevent bitmap to be freed after checking */ + mutex_lock(&mddev->bitmap_info.mutex); spin_lock(&mddev->lock); if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { - seq_printf(seq, "%s : %sactive", mdname(mddev), - mddev->pers ? "" : "in"); + seq_printf(seq, "%s : ", mdname(mddev)); if (mddev->pers) { + if (test_bit(MD_BROKEN, &mddev->flags)) + seq_printf(seq, "broken"); + else + seq_printf(seq, "active"); if (mddev->ro == MD_RDONLY) seq_printf(seq, " (read-only)"); if (mddev->ro == MD_AUTO_READ) seq_printf(seq, " (auto-read-only)"); - seq_printf(seq, " %s", mddev->pers->name); + seq_printf(seq, " %s", mddev->pers->head.name); + } else { + seq_printf(seq, "inactive"); } sectors = 0; @@ -8297,12 +8877,18 @@ static int md_seq_show(struct seq_file *seq, void *v) } else seq_printf(seq, "\n "); - md_bitmap_status(seq, mddev->bitmap); + md_bitmap_status(seq, mddev); seq_printf(seq, "\n"); } spin_unlock(&mddev->lock); + mutex_unlock(&mddev->bitmap_info.mutex); + spin_lock(&all_mddevs_lock); + + if (mddev == list_last_entry(&all_mddevs, struct mddev, all_mddevs)) + status_unused(seq); + mddev_put_locked(mddev); return 0; } @@ -8353,67 +8939,34 @@ static const struct proc_ops mdstat_proc_ops = { .proc_poll = mdstat_poll, }; -int register_md_personality(struct md_personality *p) +int register_md_submodule(struct md_submodule_head *msh) { - pr_debug("md: %s personality registered for level %d\n", - p->name, p->level); - spin_lock(&pers_lock); - list_add_tail(&p->list, &pers_list); - spin_unlock(&pers_lock); - return 0; -} -EXPORT_SYMBOL(register_md_personality); - -int unregister_md_personality(struct md_personality *p) -{ - pr_debug("md: %s personality unregistered\n", p->name); - spin_lock(&pers_lock); - list_del_init(&p->list); - spin_unlock(&pers_lock); - return 0; -} -EXPORT_SYMBOL(unregister_md_personality); - -int register_md_cluster_operations(struct md_cluster_operations *ops, - struct module *module) -{ - int ret = 0; - spin_lock(&pers_lock); - if (md_cluster_ops != NULL) - ret = -EALREADY; - else { - md_cluster_ops = ops; - md_cluster_mod = module; - } - spin_unlock(&pers_lock); - return ret; + return xa_insert(&md_submodule, msh->id, msh, GFP_KERNEL); } -EXPORT_SYMBOL(register_md_cluster_operations); +EXPORT_SYMBOL_GPL(register_md_submodule); -int unregister_md_cluster_operations(void) +void unregister_md_submodule(struct md_submodule_head *msh) { - spin_lock(&pers_lock); - md_cluster_ops = NULL; - spin_unlock(&pers_lock); - return 0; + xa_erase(&md_submodule, msh->id); } -EXPORT_SYMBOL(unregister_md_cluster_operations); +EXPORT_SYMBOL_GPL(unregister_md_submodule); int md_setup_cluster(struct mddev *mddev, int nodes) { - int ret; - if (!md_cluster_ops) + int ret = get_cluster_ops(mddev); + + if (ret) { request_module("md-cluster"); - spin_lock(&pers_lock); + ret = get_cluster_ops(mddev); + } + /* ensure module won't be unloaded */ - if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { + if (ret) { pr_warn("can't find md-cluster module or get its reference.\n"); - spin_unlock(&pers_lock); - return -ENOENT; + return ret; } - spin_unlock(&pers_lock); - ret = md_cluster_ops->join(mddev, nodes); + ret = mddev->cluster_ops->join(mddev, nodes); if (!ret) mddev->safemode_delay = 0; return ret; @@ -8421,52 +8974,58 @@ int md_setup_cluster(struct mddev *mddev, int nodes) void md_cluster_stop(struct mddev *mddev) { - if (!md_cluster_ops) - return; - md_cluster_ops->leave(mddev); - module_put(md_cluster_mod); + put_cluster_ops(mddev); +} + +static bool is_rdev_holder_idle(struct md_rdev *rdev, bool init) +{ + unsigned long last_events = rdev->last_events; + + if (!bdev_is_partition(rdev->bdev)) + return true; + + /* + * If rdev is partition, and user doesn't issue IO to the array, the + * array is still not idle if user issues IO to other partitions. + */ + rdev->last_events = part_stat_read_accum(rdev->bdev->bd_disk->part0, + sectors) - + part_stat_read_accum(rdev->bdev, sectors); + + return init || rdev->last_events <= last_events; } -static int is_mddev_idle(struct mddev *mddev, int init) +/* + * mddev is idle if following conditions are matched since last check: + * 1) mddev doesn't have normal IO completed; + * 2) mddev doesn't have inflight normal IO; + * 3) if any member disk is partition, and other partitions don't have IO + * completed; + * + * Noted this checking rely on IO accounting is enabled. + */ +static bool is_mddev_idle(struct mddev *mddev, int init) { + unsigned long last_events = mddev->normal_io_events; + struct gendisk *disk; struct md_rdev *rdev; - int idle; - int curr_events; + bool idle = true; + + disk = mddev_is_dm(mddev) ? mddev->dm_gendisk : mddev->gendisk; + if (!disk) + return true; + + mddev->normal_io_events = part_stat_read_accum(disk->part0, sectors); + if (!init && (mddev->normal_io_events > last_events || + bdev_count_inflight(disk->part0))) + idle = false; - idle = 1; rcu_read_lock(); - rdev_for_each_rcu(rdev, mddev) { - struct gendisk *disk = rdev->bdev->bd_disk; - curr_events = (int)part_stat_read_accum(disk->part0, sectors) - - atomic_read(&disk->sync_io); - /* sync IO will cause sync_io to increase before the disk_stats - * as sync_io is counted when a request starts, and - * disk_stats is counted when it completes. - * So resync activity will cause curr_events to be smaller than - * when there was no such activity. - * non-sync IO will cause disk_stat to increase without - * increasing sync_io so curr_events will (eventually) - * be larger than it was before. Once it becomes - * substantially larger, the test below will cause - * the array to appear non-idle, and resync will slow - * down. - * If there is a lot of outstanding resync activity when - * we set last_event to curr_events, then all that activity - * completing might cause the array to appear non-idle - * and resync will be slowed down even though there might - * not have been non-resync activity. This will only - * happen once though. 'last_events' will soon reflect - * the state where there is little or no outstanding - * resync requests, and further resync activity will - * always make curr_events less than last_events. - * - */ - if (init || curr_events - rdev->last_events > 64) { - rdev->last_events = curr_events; - idle = 0; - } - } + rdev_for_each_rcu(rdev, mddev) + if (!is_rdev_holder_idle(rdev, init)) + idle = false; rcu_read_unlock(); + return idle; } @@ -8491,12 +9050,12 @@ EXPORT_SYMBOL(md_done_sync); * A return value of 'false' means that the write wasn't recorded * and cannot proceed as the array is being suspend. */ -bool md_write_start(struct mddev *mddev, struct bio *bi) +void md_write_start(struct mddev *mddev, struct bio *bi) { int did_change = 0; if (bio_data_dir(bi) != WRITE) - return true; + return; BUG_ON(mddev->ro == MD_RDONLY); if (mddev->ro == MD_AUTO_READ) { @@ -8528,15 +9087,9 @@ bool md_write_start(struct mddev *mddev, struct bio *bi) if (did_change) sysfs_notify_dirent_safe(mddev->sysfs_state); if (!mddev->has_superblocks) - return true; + return; wait_event(mddev->sb_wait, - !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) || - mddev->suspended); - if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { - percpu_ref_put(&mddev->writes_pending); - return false; - } - return true; + !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); } EXPORT_SYMBOL(md_write_start); @@ -8586,67 +9139,106 @@ void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev, bio_chain(discard_bio, bio); bio_clone_blkg_association(discard_bio, bio); - if (mddev->gendisk) - trace_block_bio_remap(discard_bio, - disk_devt(mddev->gendisk), - bio->bi_iter.bi_sector); + mddev_trace_remap(mddev, discard_bio, bio->bi_iter.bi_sector); submit_bio_noacct(discard_bio); } EXPORT_SYMBOL_GPL(md_submit_discard_bio); -int acct_bioset_init(struct mddev *mddev) +static void md_bitmap_start(struct mddev *mddev, + struct md_io_clone *md_io_clone) { - int err = 0; + md_bitmap_fn *fn = unlikely(md_io_clone->rw == STAT_DISCARD) ? + mddev->bitmap_ops->start_discard : + mddev->bitmap_ops->start_write; - if (!bioset_initialized(&mddev->io_acct_set)) - err = bioset_init(&mddev->io_acct_set, BIO_POOL_SIZE, - offsetof(struct md_io_acct, bio_clone), 0); - return err; + if (mddev->pers->bitmap_sector) + mddev->pers->bitmap_sector(mddev, &md_io_clone->offset, + &md_io_clone->sectors); + + fn(mddev, md_io_clone->offset, md_io_clone->sectors); } -EXPORT_SYMBOL_GPL(acct_bioset_init); -void acct_bioset_exit(struct mddev *mddev) +static void md_bitmap_end(struct mddev *mddev, struct md_io_clone *md_io_clone) { - bioset_exit(&mddev->io_acct_set); + md_bitmap_fn *fn = unlikely(md_io_clone->rw == STAT_DISCARD) ? + mddev->bitmap_ops->end_discard : + mddev->bitmap_ops->end_write; + + fn(mddev, md_io_clone->offset, md_io_clone->sectors); } -EXPORT_SYMBOL_GPL(acct_bioset_exit); -static void md_end_io_acct(struct bio *bio) +static void md_end_clone_io(struct bio *bio) { - struct md_io_acct *md_io_acct = bio->bi_private; - struct bio *orig_bio = md_io_acct->orig_bio; + struct md_io_clone *md_io_clone = bio->bi_private; + struct bio *orig_bio = md_io_clone->orig_bio; + struct mddev *mddev = md_io_clone->mddev; + + if (bio_data_dir(orig_bio) == WRITE && md_bitmap_enabled(mddev, false)) + md_bitmap_end(mddev, md_io_clone); - orig_bio->bi_status = bio->bi_status; + if (bio->bi_status && !orig_bio->bi_status) + orig_bio->bi_status = bio->bi_status; + + if (md_io_clone->start_time) + bio_end_io_acct(orig_bio, md_io_clone->start_time); - bio_end_io_acct(orig_bio, md_io_acct->start_time); bio_put(bio); bio_endio(orig_bio); + percpu_ref_put(&mddev->active_io); } -/* - * Used by personalities that don't already clone the bio and thus can't - * easily add the timestamp to their extended bio structure. - */ -void md_account_bio(struct mddev *mddev, struct bio **bio) +static void md_clone_bio(struct mddev *mddev, struct bio **bio) { struct block_device *bdev = (*bio)->bi_bdev; - struct md_io_acct *md_io_acct; - struct bio *clone; + struct md_io_clone *md_io_clone; + struct bio *clone = + bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_clone_set); - if (!blk_queue_io_stat(bdev->bd_disk->queue)) - return; + md_io_clone = container_of(clone, struct md_io_clone, bio_clone); + md_io_clone->orig_bio = *bio; + md_io_clone->mddev = mddev; + if (blk_queue_io_stat(bdev->bd_disk->queue)) + md_io_clone->start_time = bio_start_io_acct(*bio); - clone = bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_acct_set); - md_io_acct = container_of(clone, struct md_io_acct, bio_clone); - md_io_acct->orig_bio = *bio; - md_io_acct->start_time = bio_start_io_acct(*bio); + if (bio_data_dir(*bio) == WRITE && md_bitmap_enabled(mddev, false)) { + md_io_clone->offset = (*bio)->bi_iter.bi_sector; + md_io_clone->sectors = bio_sectors(*bio); + md_io_clone->rw = op_stat_group(bio_op(*bio)); + md_bitmap_start(mddev, md_io_clone); + } - clone->bi_end_io = md_end_io_acct; - clone->bi_private = md_io_acct; + clone->bi_end_io = md_end_clone_io; + clone->bi_private = md_io_clone; *bio = clone; } + +void md_account_bio(struct mddev *mddev, struct bio **bio) +{ + percpu_ref_get(&mddev->active_io); + md_clone_bio(mddev, bio); +} EXPORT_SYMBOL_GPL(md_account_bio); +void md_free_cloned_bio(struct bio *bio) +{ + struct md_io_clone *md_io_clone = bio->bi_private; + struct bio *orig_bio = md_io_clone->orig_bio; + struct mddev *mddev = md_io_clone->mddev; + + if (bio_data_dir(orig_bio) == WRITE && md_bitmap_enabled(mddev, false)) + md_bitmap_end(mddev, md_io_clone); + + if (bio->bi_status && !orig_bio->bi_status) + orig_bio->bi_status = bio->bi_status; + + if (md_io_clone->start_time) + bio_end_io_acct(orig_bio, md_io_clone->start_time); + + bio_put(bio); + percpu_ref_put(&mddev->active_io); +} +EXPORT_SYMBOL_GPL(md_free_cloned_bio); + /* md_allow_write(mddev) * Calling this ensures that the array is marked 'active' so that writes * may proceed without blocking. It is important to call this before @@ -8681,6 +9273,124 @@ void md_allow_write(struct mddev *mddev) } EXPORT_SYMBOL_GPL(md_allow_write); +static sector_t md_sync_max_sectors(struct mddev *mddev, + enum sync_action action) +{ + switch (action) { + case ACTION_RESYNC: + case ACTION_CHECK: + case ACTION_REPAIR: + atomic64_set(&mddev->resync_mismatches, 0); + fallthrough; + case ACTION_RESHAPE: + return mddev->resync_max_sectors; + case ACTION_RECOVER: + return mddev->dev_sectors; + default: + return 0; + } +} + +/* + * If lazy recovery is requested and all rdevs are in sync, select the rdev with + * the higest index to perfore recovery to build initial xor data, this is the + * same as old bitmap. + */ +static bool mddev_select_lazy_recover_rdev(struct mddev *mddev) +{ + struct md_rdev *recover_rdev = NULL; + struct md_rdev *rdev; + bool ret = false; + + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) { + if (rdev->raid_disk < 0) + continue; + + if (test_bit(Faulty, &rdev->flags) || + !test_bit(In_sync, &rdev->flags)) + break; + + if (!recover_rdev || recover_rdev->raid_disk < rdev->raid_disk) + recover_rdev = rdev; + } + + if (recover_rdev) { + clear_bit(In_sync, &recover_rdev->flags); + ret = true; + } + + rcu_read_unlock(); + return ret; +} + +static sector_t md_sync_position(struct mddev *mddev, enum sync_action action) +{ + sector_t start = 0; + struct md_rdev *rdev; + + switch (action) { + case ACTION_CHECK: + case ACTION_REPAIR: + return mddev->resync_min; + case ACTION_RESYNC: + if (!mddev->bitmap) + return mddev->resync_offset; + return 0; + case ACTION_RESHAPE: + /* + * If the original node aborts reshaping then we continue the + * reshaping, so set again to avoid restart reshape from the + * first beginning + */ + if (mddev_is_clustered(mddev) && + mddev->reshape_position != MaxSector) + return mddev->reshape_position; + return 0; + case ACTION_RECOVER: + start = MaxSector; + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) + if (rdev_needs_recovery(rdev, start)) + start = rdev->recovery_offset; + rcu_read_unlock(); + + /* + * If there are no spares, and raid456 lazy initial recover is + * requested. + */ + if (test_bit(MD_RECOVERY_LAZY_RECOVER, &mddev->recovery) && + start == MaxSector && mddev_select_lazy_recover_rdev(mddev)) + start = 0; + + /* If there is a bitmap, we need to make sure all + * writes that started before we added a spare + * complete before we start doing a recovery. + * Otherwise the write might complete and (via + * bitmap_endwrite) set a bit in the bitmap after the + * recovery has checked that bit and skipped that + * region. + */ + if (mddev->bitmap) { + mddev->pers->quiesce(mddev, 1); + mddev->pers->quiesce(mddev, 0); + } + return start; + default: + return MaxSector; + } +} + +static bool sync_io_within_limit(struct mddev *mddev) +{ + /* + * For raid456, sync IO is stripe(4k) per IO, for other levels, it's + * RESYNC_PAGES(64k) per IO. + */ + return atomic_read(&mddev->recovery_active) < + (raid_is_456(mddev) ? 8 : 128) * sync_io_depth(mddev); +} + #define SYNC_MARKS 10 #define SYNC_MARK_STEP (3*HZ) #define UPDATE_FREQUENCY (5*60*HZ) @@ -8697,21 +9407,26 @@ void md_do_sync(struct md_thread *thread) sector_t last_check; int skipped = 0; struct md_rdev *rdev; - char *desc, *action = NULL; + enum sync_action action; + const char *desc; struct blk_plug plug; int ret; /* just incase thread restarts... */ - if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) || - test_bit(MD_RECOVERY_WAIT, &mddev->recovery)) + if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) return; - if (!md_is_rdwr(mddev)) {/* never try to sync a read-only array */ + + if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) + goto skip; + + if (test_bit(MD_RECOVERY_WAIT, &mddev->recovery) || + !md_is_rdwr(mddev)) {/* never try to sync a read-only array */ set_bit(MD_RECOVERY_INTR, &mddev->recovery); - return; + goto skip; } if (mddev_is_clustered(mddev)) { - ret = md_cluster_ops->resync_start(mddev); + ret = mddev->cluster_ops->resync_start(mddev); if (ret) goto skip; @@ -8724,21 +9439,14 @@ void md_do_sync(struct md_thread *thread) goto skip; } - if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { - if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { - desc = "data-check"; - action = "check"; - } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { - desc = "requested-resync"; - action = "repair"; - } else - desc = "resync"; - } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) - desc = "reshape"; - else - desc = "recovery"; + action = md_sync_action(mddev); + if (action == ACTION_FROZEN || action == ACTION_IDLE) { + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + goto skip; + } - mddev->last_sync_action = action ?: desc; + desc = md_sync_action_name(action); + mddev->last_sync_action = action; /* * Before starting a resync we must have set curr_resync to @@ -8749,7 +9457,8 @@ void md_do_sync(struct md_thread *thread) * This will mean we have to start checking from the beginning again. * */ - + if (mddev_is_clustered(mddev)) + mddev->cluster_ops->resync_start_notify(mddev); do { int mddev2_minor = -1; mddev->curr_resync = MD_RESYNC_DELAYED; @@ -8806,56 +9515,8 @@ void md_do_sync(struct md_thread *thread) spin_unlock(&all_mddevs_lock); } while (mddev->curr_resync < MD_RESYNC_DELAYED); - j = 0; - if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { - /* resync follows the size requested by the personality, - * which defaults to physical size, but can be virtual size - */ - max_sectors = mddev->resync_max_sectors; - atomic64_set(&mddev->resync_mismatches, 0); - /* we don't use the checkpoint if there's a bitmap */ - if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) - j = mddev->resync_min; - else if (!mddev->bitmap) - j = mddev->recovery_cp; - - } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { - max_sectors = mddev->resync_max_sectors; - /* - * If the original node aborts reshaping then we continue the - * reshaping, so set j again to avoid restart reshape from the - * first beginning - */ - if (mddev_is_clustered(mddev) && - mddev->reshape_position != MaxSector) - j = mddev->reshape_position; - } else { - /* recovery follows the physical size of devices */ - max_sectors = mddev->dev_sectors; - j = MaxSector; - rcu_read_lock(); - rdev_for_each_rcu(rdev, mddev) - if (rdev->raid_disk >= 0 && - !test_bit(Journal, &rdev->flags) && - !test_bit(Faulty, &rdev->flags) && - !test_bit(In_sync, &rdev->flags) && - rdev->recovery_offset < j) - j = rdev->recovery_offset; - rcu_read_unlock(); - - /* If there is a bitmap, we need to make sure all - * writes that started before we added a spare - * complete before we start doing a recovery. - * Otherwise the write might complete and (via - * bitmap_endwrite) set a bit in the bitmap after the - * recovery has checked that bit and skipped that - * region. - */ - if (mddev->bitmap) { - mddev->pers->quiesce(mddev, 1); - mddev->pers->quiesce(mddev, 0); - } - } + max_sectors = md_sync_max_sectors(mddev, action); + j = md_sync_position(mddev, action); pr_info("md: %s of RAID array %s\n", desc, mdname(mddev)); pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev)); @@ -8883,7 +9544,7 @@ void md_do_sync(struct md_thread *thread) atomic_set(&mddev->recovery_active, 0); last_check = 0; - if (j>2) { + if (j >= MD_RESYNC_ACTIVE) { pr_debug("md: resuming %s of %s from checkpoint.\n", desc, mdname(mddev)); mddev->curr_resync = j; @@ -8914,8 +9575,8 @@ void md_do_sync(struct md_thread *thread) atomic_read(&mddev->recovery_active) == 0); mddev->curr_resync_completed = j; if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && - j > mddev->recovery_cp) - mddev->recovery_cp = j; + j > mddev->resync_offset) + mddev->resync_offset = j; update_time = jiffies; set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); sysfs_notify_dirent_safe(mddev->sysfs_completed); @@ -8937,7 +9598,14 @@ void md_do_sync(struct md_thread *thread) if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) break; - sectors = mddev->pers->sync_request(mddev, j, &skipped); + if (mddev->bitmap_ops && mddev->bitmap_ops->skip_sync_blocks) { + sectors = mddev->bitmap_ops->skip_sync_blocks(mddev, j); + if (sectors) + goto update; + } + + sectors = mddev->pers->sync_request(mddev, j, max_sectors, + &skipped); if (sectors == 0) { set_bit(MD_RECOVERY_INTR, &mddev->recovery); break; @@ -8951,11 +9619,12 @@ void md_do_sync(struct md_thread *thread) if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) break; +update: j += sectors; if (j > max_sectors) /* when skipping, extra large numbers can be returned. */ j = max_sectors; - if (j > 2) + if (j >= MD_RESYNC_ACTIVE) mddev->curr_resync = j; mddev->curr_mark_cnt = io_sectors; if (last_check == 0) @@ -9002,7 +9671,8 @@ void md_do_sync(struct md_thread *thread) msleep(500); goto repeat; } - if (!is_mddev_idle(mddev, 0)) { + if (!sync_io_within_limit(mddev) && + !is_mddev_idle(mddev, 0)) { /* * Give other IO more of a chance. * The faster the devices, the less we wait. @@ -9027,25 +9697,25 @@ void md_do_sync(struct md_thread *thread) mddev->curr_resync_completed = mddev->curr_resync; sysfs_notify_dirent_safe(mddev->sysfs_completed); } - mddev->pers->sync_request(mddev, max_sectors, &skipped); + mddev->pers->sync_request(mddev, max_sectors, max_sectors, &skipped); if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && - mddev->curr_resync >= MD_RESYNC_ACTIVE) { + mddev->curr_resync > MD_RESYNC_ACTIVE) { if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { - if (mddev->curr_resync >= mddev->recovery_cp) { + if (mddev->curr_resync >= mddev->resync_offset) { pr_debug("md: checkpointing %s of %s.\n", desc, mdname(mddev)); if (test_bit(MD_RECOVERY_ERROR, &mddev->recovery)) - mddev->recovery_cp = + mddev->resync_offset = mddev->curr_resync_completed; else - mddev->recovery_cp = + mddev->resync_offset = mddev->curr_resync; } } else - mddev->recovery_cp = MaxSector; + mddev->resync_offset = MaxSector; } else { if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) mddev->curr_resync = MaxSector; @@ -9053,12 +9723,8 @@ void md_do_sync(struct md_thread *thread) test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) { rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) - if (rdev->raid_disk >= 0 && - mddev->delta_disks >= 0 && - !test_bit(Journal, &rdev->flags) && - !test_bit(Faulty, &rdev->flags) && - !test_bit(In_sync, &rdev->flags) && - rdev->recovery_offset < mddev->curr_resync) + if (mddev->delta_disks >= 0 && + rdev_needs_recovery(rdev, mddev->curr_resync)) rdev->recovery_offset = mddev->curr_resync; rcu_read_unlock(); } @@ -9076,7 +9742,7 @@ void md_do_sync(struct md_thread *thread) mddev->delta_disks > 0 && mddev->pers->finish_reshape && mddev->pers->size && - mddev->queue) { + !mddev_is_dm(mddev)) { mddev_lock_nointr(mddev); md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0)); mddev_unlock(mddev); @@ -9103,84 +9769,141 @@ void md_do_sync(struct md_thread *thread) } EXPORT_SYMBOL_GPL(md_do_sync); -static int remove_and_add_spares(struct mddev *mddev, - struct md_rdev *this) +static bool rdev_removeable(struct md_rdev *rdev) { - struct md_rdev *rdev; - int spares = 0; - int removed = 0; - bool remove_some = false; + /* rdev is not used. */ + if (rdev->raid_disk < 0) + return false; - if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) - /* Mustn't remove devices when resync thread is running */ - return 0; + /* There are still inflight io, don't remove this rdev. */ + if (atomic_read(&rdev->nr_pending)) + return false; - rdev_for_each(rdev, mddev) { - if ((this == NULL || rdev == this) && - rdev->raid_disk >= 0 && - !test_bit(Blocked, &rdev->flags) && - test_bit(Faulty, &rdev->flags) && - atomic_read(&rdev->nr_pending)==0) { - /* Faulty non-Blocked devices with nr_pending == 0 - * never get nr_pending incremented, - * never get Faulty cleared, and never get Blocked set. - * So we can synchronize_rcu now rather than once per device - */ - remove_some = true; - set_bit(RemoveSynchronized, &rdev->flags); + /* + * An error occurred but has not yet been acknowledged by the metadata + * handler, don't remove this rdev. + */ + if (test_bit(Blocked, &rdev->flags)) + return false; + + /* Fautly rdev is not used, it's safe to remove it. */ + if (test_bit(Faulty, &rdev->flags)) + return true; + + /* Journal disk can only be removed if it's faulty. */ + if (test_bit(Journal, &rdev->flags)) + return false; + + /* + * 'In_sync' is cleared while 'raid_disk' is valid, which means + * replacement has just become active from pers->spare_active(), and + * then pers->hot_remove_disk() will replace this rdev with replacement. + */ + if (!test_bit(In_sync, &rdev->flags)) + return true; + + return false; +} + +static bool rdev_is_spare(struct md_rdev *rdev) +{ + return !test_bit(Candidate, &rdev->flags) && rdev->raid_disk >= 0 && + !test_bit(In_sync, &rdev->flags) && + !test_bit(Journal, &rdev->flags) && + !test_bit(Faulty, &rdev->flags); +} + +static bool rdev_addable(struct md_rdev *rdev) +{ + struct mddev *mddev; + + mddev = READ_ONCE(rdev->mddev); + if (!mddev) + return false; + + /* rdev is already used, don't add it again. */ + if (test_bit(Candidate, &rdev->flags) || rdev->raid_disk >= 0 || + test_bit(Faulty, &rdev->flags)) + return false; + + /* Allow to add journal disk. */ + if (test_bit(Journal, &rdev->flags)) + return true; + + /* Allow to add if array is read-write. */ + if (md_is_rdwr(mddev)) + return true; + + /* + * For read-only array, only allow to readd a rdev. And if bitmap is + * used, don't allow to readd a rdev that is too old. + */ + if (rdev->saved_raid_disk >= 0 && !test_bit(Bitmap_sync, &rdev->flags)) + return true; + + return false; +} + +static bool md_spares_need_change(struct mddev *mddev) +{ + struct md_rdev *rdev; + + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) { + if (rdev_removeable(rdev) || rdev_addable(rdev)) { + rcu_read_unlock(); + return true; } } + rcu_read_unlock(); + return false; +} + +static int remove_spares(struct mddev *mddev, struct md_rdev *this) +{ + struct md_rdev *rdev; + int removed = 0; - if (remove_some) - synchronize_rcu(); rdev_for_each(rdev, mddev) { - if ((this == NULL || rdev == this) && - rdev->raid_disk >= 0 && - !test_bit(Blocked, &rdev->flags) && - ((test_bit(RemoveSynchronized, &rdev->flags) || - (!test_bit(In_sync, &rdev->flags) && - !test_bit(Journal, &rdev->flags))) && - atomic_read(&rdev->nr_pending)==0)) { - if (mddev->pers->hot_remove_disk( - mddev, rdev) == 0) { - sysfs_unlink_rdev(mddev, rdev); - rdev->saved_raid_disk = rdev->raid_disk; - rdev->raid_disk = -1; - removed++; - } + if ((this == NULL || rdev == this) && rdev_removeable(rdev) && + !mddev->pers->hot_remove_disk(mddev, rdev)) { + sysfs_unlink_rdev(mddev, rdev); + rdev->saved_raid_disk = rdev->raid_disk; + rdev->raid_disk = -1; + removed++; } - if (remove_some && test_bit(RemoveSynchronized, &rdev->flags)) - clear_bit(RemoveSynchronized, &rdev->flags); } if (removed && mddev->kobj.sd) sysfs_notify_dirent_safe(mddev->sysfs_degraded); + return removed; +} + +static int remove_and_add_spares(struct mddev *mddev, + struct md_rdev *this) +{ + struct md_rdev *rdev; + int spares = 0; + int removed = 0; + + if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + /* Mustn't remove devices when resync thread is running */ + return 0; + + removed = remove_spares(mddev, this); if (this && removed) goto no_add; rdev_for_each(rdev, mddev) { if (this && this != rdev) continue; - if (test_bit(Candidate, &rdev->flags)) - continue; - if (rdev->raid_disk >= 0 && - !test_bit(In_sync, &rdev->flags) && - !test_bit(Journal, &rdev->flags) && - !test_bit(Faulty, &rdev->flags)) + if (rdev_is_spare(rdev)) spares++; - if (rdev->raid_disk >= 0) + if (!rdev_addable(rdev)) continue; - if (test_bit(Faulty, &rdev->flags)) - continue; - if (!test_bit(Journal, &rdev->flags)) { - if (!md_is_rdwr(mddev) && - !(rdev->saved_raid_disk >= 0 && - !test_bit(Bitmap_sync, &rdev->flags))) - continue; - + if (!test_bit(Journal, &rdev->flags)) rdev->recovery_offset = 0; - } if (mddev->pers->hot_add_disk(mddev, rdev) == 0) { /* failure here is OK */ sysfs_link_rdev(mddev, rdev); @@ -9196,31 +9919,201 @@ no_add: return spares; } +static bool md_choose_sync_action(struct mddev *mddev, int *spares) +{ + /* Check if reshape is in progress first. */ + if (mddev->reshape_position != MaxSector) { + if (mddev->pers->check_reshape == NULL || + mddev->pers->check_reshape(mddev) != 0) + return false; + + set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); + clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + clear_bit(MD_RECOVERY_LAZY_RECOVER, &mddev->recovery); + return true; + } + + /* Check if resync is in progress. */ + if (mddev->resync_offset < MaxSector) { + remove_spares(mddev, NULL); + set_bit(MD_RECOVERY_SYNC, &mddev->recovery); + clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + clear_bit(MD_RECOVERY_LAZY_RECOVER, &mddev->recovery); + return true; + } + + /* + * Remove any failed drives, then add spares if possible. Spares are + * also removed and re-added, to allow the personality to fail the + * re-add. + */ + *spares = remove_and_add_spares(mddev, NULL); + if (*spares || test_bit(MD_RECOVERY_LAZY_RECOVER, &mddev->recovery)) { + clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); + clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); + clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + + /* Start new recovery. */ + set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + return true; + } + + /* Delay to choose resync/check/repair in md_do_sync(). */ + if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) + return true; + + /* Nothing to be done */ + return false; +} + static void md_start_sync(struct work_struct *ws) { - struct mddev *mddev = container_of(ws, struct mddev, del_work); + struct mddev *mddev = container_of(ws, struct mddev, sync_work); + int spares = 0; + bool suspend = false; + char *name; + + /* + * If reshape is still in progress, spares won't be added or removed + * from conf until reshape is done. + */ + if (mddev->reshape_position == MaxSector && + md_spares_need_change(mddev)) { + suspend = true; + mddev_suspend(mddev, false); + } + + mddev_lock_nointr(mddev); + if (!md_is_rdwr(mddev)) { + /* + * On a read-only array we can: + * - remove failed devices + * - add already-in_sync devices if the array itself is in-sync. + * As we only add devices that are already in-sync, we can + * activate the spares immediately. + */ + remove_and_add_spares(mddev, NULL); + goto not_running; + } - mddev->sync_thread = md_register_thread(md_do_sync, - mddev, - "resync"); + if (!md_choose_sync_action(mddev, &spares)) + goto not_running; + + if (!mddev->pers->sync_request) + goto not_running; + + /* + * We are adding a device or devices to an array which has the bitmap + * stored on all devices. So make sure all bitmap pages get written. + */ + if (spares && md_bitmap_enabled(mddev, true)) + mddev->bitmap_ops->write_all(mddev); + + name = test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ? + "reshape" : "resync"; + rcu_assign_pointer(mddev->sync_thread, + md_register_thread(md_do_sync, mddev, name)); if (!mddev->sync_thread) { pr_warn("%s: could not start resync thread...\n", mdname(mddev)); /* leave the spares where they are, it shouldn't hurt */ - clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); - clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); - clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); - clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); - clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); - wake_up(&resync_wait); - if (test_and_clear_bit(MD_RECOVERY_RECOVER, - &mddev->recovery)) - if (mddev->sysfs_action) - sysfs_notify_dirent_safe(mddev->sysfs_action); - } else - md_wakeup_thread(mddev->sync_thread); + goto not_running; + } + + mddev_unlock(mddev); + /* + * md_start_sync was triggered by MD_RECOVERY_NEEDED, so we should + * not set it again. Otherwise, we may cause issue like this one: + * https://bugzilla.kernel.org/show_bug.cgi?id=218200 + * Therefore, use __mddev_resume(mddev, false). + */ + if (suspend) + __mddev_resume(mddev, false); + md_wakeup_thread(mddev->sync_thread); sysfs_notify_dirent_safe(mddev->sysfs_action); md_new_event(); + return; + +not_running: + clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); + clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); + clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); + clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); + mddev_unlock(mddev); + /* + * md_start_sync was triggered by MD_RECOVERY_NEEDED, so we should + * not set it again. Otherwise, we may cause issue like this one: + * https://bugzilla.kernel.org/show_bug.cgi?id=218200 + * Therefore, use __mddev_resume(mddev, false). + */ + if (suspend) + __mddev_resume(mddev, false); + + wake_up(&resync_wait); + if (test_and_clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery) && + mddev->sysfs_action) + sysfs_notify_dirent_safe(mddev->sysfs_action); +} + +static void unregister_sync_thread(struct mddev *mddev) +{ + if (!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { + /* resync/recovery still happening */ + clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + return; + } + + if (WARN_ON_ONCE(!mddev->sync_thread)) + return; + + md_reap_sync_thread(mddev); +} + +static bool md_should_do_recovery(struct mddev *mddev) +{ + /* + * As long as one of the following flags is set, + * recovery needs to do or cleanup. + */ + if (test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || + test_bit(MD_RECOVERY_DONE, &mddev->recovery)) + return true; + + /* + * If no flags are set and it is in read-only status, + * there is nothing to do. + */ + if (!md_is_rdwr(mddev)) + return false; + + /* + * MD_SB_CHANGE_PENDING indicates that the array is switching from clean to + * active, and no action is needed for now. + * All other MD_SB_* flags require to update the superblock. + */ + if (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) + return true; + + /* + * If the array is not using external metadata and there has been no data + * written for some time, then the array's status needs to be set to + * in_sync. + */ + if (mddev->external == 0 && mddev->safemode == 1) + return true; + + /* + * When the system is about to restart or the process receives an signal, + * the array needs to be synchronized as soon as possible. + * Once the data synchronization is completed, need to change the array + * status to in_sync. + */ + if (mddev->safemode == 2 && !mddev->in_sync && + mddev->resync_offset == MaxSector) + return true; + + return false; } /* @@ -9247,23 +10140,8 @@ static void md_start_sync(struct work_struct *ws) */ void md_check_recovery(struct mddev *mddev) { - if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) { - /* Write superblock - thread that called mddev_suspend() - * holds reconfig_mutex for us. - */ - set_bit(MD_UPDATING_SB, &mddev->flags); - smp_mb__after_atomic(); - if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags)) - md_update_sb(mddev, 0); - clear_bit_unlock(MD_UPDATING_SB, &mddev->flags); - wake_up(&mddev->sb_wait); - } - - if (mddev->suspended) - return; - - if (mddev->bitmap) - md_bitmap_daemon_work(mddev); + if (md_bitmap_enabled(mddev, false) && mddev->bitmap_ops->daemon_work) + mddev->bitmap_ops->daemon_work(mddev); if (signal_pending(current)) { if (mddev->pers->sync_request && !mddev->external) { @@ -9274,21 +10152,10 @@ void md_check_recovery(struct mddev *mddev) flush_signals(current); } - if (!md_is_rdwr(mddev) && - !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) - return; - if ( ! ( - (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) || - test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || - test_bit(MD_RECOVERY_DONE, &mddev->recovery) || - (mddev->external == 0 && mddev->safemode == 1) || - (mddev->safemode == 2 - && !mddev->in_sync && mddev->recovery_cp == MaxSector) - )) + if (!md_should_do_recovery(mddev)) return; if (mddev_trylock(mddev)) { - int spares = 0; bool try_set_sync = mddev->safemode != 0; if (!mddev->external && mddev->safemode == 1) @@ -9296,31 +10163,43 @@ void md_check_recovery(struct mddev *mddev) if (!md_is_rdwr(mddev)) { struct md_rdev *rdev; + + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { + unregister_sync_thread(mddev); + goto unlock; + } + if (!mddev->external && mddev->in_sync) - /* 'Blocked' flag not needed as failed devices + /* + * 'Blocked' flag not needed as failed devices * will be recorded if array switched to read/write. * Leaving it set will prevent the device * from being removed. */ rdev_for_each(rdev, mddev) clear_bit(Blocked, &rdev->flags); - /* On a read-only array we can: - * - remove failed devices - * - add already-in_sync devices if the array itself - * is in-sync. - * As we only add devices that are already in-sync, - * we can activate the spares immediately. - */ - remove_and_add_spares(mddev, NULL); - /* There is no thread, but we need to call + + /* + * There is no thread, but we need to call * ->spare_active and clear saved_raid_disk */ set_bit(MD_RECOVERY_INTR, &mddev->recovery); - md_unregister_thread(&mddev->sync_thread); md_reap_sync_thread(mddev); + + /* + * Let md_start_sync() to remove and add rdevs to the + * array. + */ + if (md_spares_need_change(mddev)) { + set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); + queue_work(md_misc_wq, &mddev->sync_work); + } + clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + clear_bit(MD_RECOVERY_LAZY_RECOVER, &mddev->recovery); clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); + goto unlock; } @@ -9330,8 +10209,8 @@ void md_check_recovery(struct mddev *mddev) * remove disk. */ rdev_for_each_safe(rdev, tmp, mddev) { - if (test_and_clear_bit(ClusterRemove, &rdev->flags) && - rdev->raid_disk < 0) + if (rdev->raid_disk < 0 && + test_and_clear_bit(ClusterRemove, &rdev->flags)) md_kick_rdev_from_array(rdev); } } @@ -9345,17 +10224,15 @@ void md_check_recovery(struct mddev *mddev) if (mddev->sb_flags) md_update_sb(mddev, 0); - if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && - !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { - /* resync/recovery still happening */ - clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - goto unlock; - } - if (mddev->sync_thread) { - md_unregister_thread(&mddev->sync_thread); - md_reap_sync_thread(mddev); + /* + * Never start a new sync thread if MD_RECOVERY_RUNNING is + * still set. + */ + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { + unregister_sync_thread(mddev); goto unlock; } + /* Set RUNNING before clearing NEEDED to avoid * any transients in the value of "sync_action". */ @@ -9369,56 +10246,14 @@ void md_check_recovery(struct mddev *mddev) clear_bit(MD_RECOVERY_INTR, &mddev->recovery); clear_bit(MD_RECOVERY_DONE, &mddev->recovery); - if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || - test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) - goto not_running; - /* no recovery is running. - * remove any failed drives, then - * add spares if possible. - * Spares are also removed and re-added, to allow - * the personality to fail the re-add. - */ - - if (mddev->reshape_position != MaxSector) { - if (mddev->pers->check_reshape == NULL || - mddev->pers->check_reshape(mddev) != 0) - /* Cannot proceed */ - goto not_running; - set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); - clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); - } else if ((spares = remove_and_add_spares(mddev, NULL))) { - clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); - clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); - clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); - set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); - } else if (mddev->recovery_cp < MaxSector) { - set_bit(MD_RECOVERY_SYNC, &mddev->recovery); - clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); - } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) - /* nothing to be done ... */ - goto not_running; - - if (mddev->pers->sync_request) { - if (spares) { - /* We are adding a device or devices to an array - * which has the bitmap stored on all devices. - * So make sure all bitmap pages get written - */ - md_bitmap_write_all(mddev->bitmap); - } - INIT_WORK(&mddev->del_work, md_start_sync); - queue_work(md_misc_wq, &mddev->del_work); - goto unlock; - } - not_running: - if (!mddev->sync_thread) { + if (test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) && + !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { + queue_work(md_misc_wq, &mddev->sync_work); + } else { clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); wake_up(&resync_wait); - if (test_and_clear_bit(MD_RECOVERY_RECOVER, - &mddev->recovery)) - if (mddev->sysfs_action) - sysfs_notify_dirent_safe(mddev->sysfs_action); } + unlock: wake_up(&mddev->sb_wait); mddev_unlock(mddev); @@ -9432,7 +10267,10 @@ void md_reap_sync_thread(struct mddev *mddev) sector_t old_dev_sectors = mddev->dev_sectors; bool is_reshaped = false; - /* sync_thread should be unregistered, collect result */ + /* resync has finished, collect result */ + md_unregister_thread(mddev, &mddev->sync_thread); + atomic_inc(&mddev->sync_seq); + if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && mddev->degraded != mddev->raid_disks) { @@ -9462,22 +10300,22 @@ void md_reap_sync_thread(struct mddev *mddev) * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by * clustered raid */ if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags)) - md_cluster_ops->resync_finish(mddev); + mddev->cluster_ops->resync_finish(mddev); clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); clear_bit(MD_RECOVERY_DONE, &mddev->recovery); clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); + clear_bit(MD_RECOVERY_LAZY_RECOVER, &mddev->recovery); /* - * We call md_cluster_ops->update_size here because sync_size could + * We call mddev->cluster_ops->update_size here because sync_size could * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared, * so it is time to update size across cluster. */ if (mddev_is_clustered(mddev) && is_reshaped && !test_bit(MD_CLOSING, &mddev->flags)) - md_cluster_ops->update_size(mddev, old_dev_sectors); - wake_up(&resync_wait); + mddev->cluster_ops->update_size(mddev, old_dev_sectors); /* flag recovery needed just to double check */ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); sysfs_notify_dirent_safe(mddev->sysfs_completed); @@ -9485,15 +10323,14 @@ void md_reap_sync_thread(struct mddev *mddev) md_new_event(); if (mddev->event_work.func) queue_work(md_misc_wq, &mddev->event_work); + wake_up(&resync_wait); } EXPORT_SYMBOL(md_reap_sync_thread); void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) { sysfs_notify_dirent_safe(rdev->sysfs_state); - wait_event_timeout(rdev->blocked_wait, - !test_bit(Blocked, &rdev->flags) && - !test_bit(BlockedBadBlocks, &rdev->flags), + wait_event_timeout(rdev->blocked_wait, !rdev_blocked(rdev), msecs_to_jiffies(5000)); rdev_dec_pending(rdev, mddev); } @@ -9516,54 +10353,64 @@ EXPORT_SYMBOL(md_finish_reshape); /* Bad block management */ -/* Returns 1 on success, 0 on failure */ -int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, - int is_new) +/* Returns true on success, false on failure */ +bool rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, + int is_new) { struct mddev *mddev = rdev->mddev; - int rv; + + /* + * Recording new badblocks for faulty rdev will force unnecessary + * super block updating. This is fragile for external management because + * userspace daemon may trying to remove this device and deadlock may + * occur. This will be probably solved in the mdadm, but it is safer to + * avoid it. + */ + if (test_bit(Faulty, &rdev->flags)) + return true; + if (is_new) s += rdev->new_data_offset; else s += rdev->data_offset; - rv = badblocks_set(&rdev->badblocks, s, sectors, 0); - if (rv == 0) { - /* Make sure they get written out promptly */ - if (test_bit(ExternalBbl, &rdev->flags)) - sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks); - sysfs_notify_dirent_safe(rdev->sysfs_state); - set_mask_bits(&mddev->sb_flags, 0, - BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING)); - md_wakeup_thread(rdev->mddev->thread); - return 1; - } else - return 0; + + if (!badblocks_set(&rdev->badblocks, s, sectors, 0)) + return false; + + /* Make sure they get written out promptly */ + if (test_bit(ExternalBbl, &rdev->flags)) + sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks); + sysfs_notify_dirent_safe(rdev->sysfs_state); + set_mask_bits(&mddev->sb_flags, 0, + BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING)); + md_wakeup_thread(rdev->mddev->thread); + return true; } EXPORT_SYMBOL_GPL(rdev_set_badblocks); -int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, - int is_new) +void rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, + int is_new) { - int rv; if (is_new) s += rdev->new_data_offset; else s += rdev->data_offset; - rv = badblocks_clear(&rdev->badblocks, s, sectors); - if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags)) + + if (!badblocks_clear(&rdev->badblocks, s, sectors)) + return; + + if (test_bit(ExternalBbl, &rdev->flags)) sysfs_notify_dirent_safe(rdev->sysfs_badblocks); - return rv; } EXPORT_SYMBOL_GPL(rdev_clear_badblocks); static int md_notify_reboot(struct notifier_block *this, unsigned long code, void *x) { - struct mddev *mddev, *n; - int need_delay = 0; + struct mddev *mddev; spin_lock(&all_mddevs_lock); - list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) { + list_for_each_entry(mddev, &all_mddevs, all_mddevs) { if (!mddev_get(mddev)) continue; spin_unlock(&all_mddevs_lock); @@ -9574,21 +10421,11 @@ static int md_notify_reboot(struct notifier_block *this, mddev->safemode = 2; mddev_unlock(mddev); } - need_delay = 1; - mddev_put(mddev); spin_lock(&all_mddevs_lock); + mddev_put_locked(mddev); } spin_unlock(&all_mddevs_lock); - /* - * certain more exotic SCSI devices are known to be - * volatile wrt too early system reboots. While the - * right place to handle this issue is the given - * driver, we do want to have a safe RAID driver ... - */ - if (need_delay) - msleep(1000); - return NOTIFY_DONE; } @@ -9607,8 +10444,16 @@ static void md_geninit(void) static int __init md_init(void) { - int ret = -ENOMEM; + int ret = md_bitmap_init(); + + if (ret) + return ret; + ret = md_llbitmap_init(); + if (ret) + goto err_bitmap; + + ret = -ENOMEM; md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); if (!md_wq) goto err_wq; @@ -9617,10 +10462,6 @@ static int __init md_init(void) if (!md_misc_wq) goto err_misc_wq; - md_rdev_misc_wq = alloc_workqueue("md_rdev_misc", 0, 0); - if (!md_rdev_misc_wq) - goto err_rdev_misc_wq; - ret = __register_blkdev(MD_MAJOR, "md", md_probe); if (ret < 0) goto err_md; @@ -9631,7 +10472,7 @@ static int __init md_init(void) mdp_major = ret; register_reboot_notifier(&md_notifier); - raid_table_header = register_sysctl_table(raid_root_table); + raid_table_header = register_sysctl("dev/raid", raid_table); md_geninit(); return 0; @@ -9639,12 +10480,13 @@ static int __init md_init(void) err_mdp: unregister_blkdev(MD_MAJOR, "md"); err_md: - destroy_workqueue(md_rdev_misc_wq); -err_rdev_misc_wq: destroy_workqueue(md_misc_wq); err_misc_wq: destroy_workqueue(md_wq); err_wq: + md_llbitmap_exit(); +err_bitmap: + md_bitmap_exit(); return ret; } @@ -9662,14 +10504,17 @@ static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size)); if (ret) pr_info("md-cluster: resize failed\n"); - else - md_bitmap_update_sb(mddev->bitmap); + else if (md_bitmap_enabled(mddev, false)) + mddev->bitmap_ops->update_sb(mddev->bitmap); } /* Check for change of roles in the active devices */ rdev_for_each_safe(rdev2, tmp, mddev) { - if (test_bit(Faulty, &rdev2->flags)) + if (test_bit(Faulty, &rdev2->flags)) { + if (test_bit(ClusterRemove, &rdev2->flags)) + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); continue; + } /* Check if the roles changed */ role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); @@ -9691,8 +10536,18 @@ static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) */ if (rdev2->raid_disk == -1 && role != MD_DISK_ROLE_SPARE && !(le32_to_cpu(sb->feature_map) & - MD_FEATURE_RESHAPE_ACTIVE)) { - rdev2->saved_raid_disk = role; + MD_FEATURE_RESHAPE_ACTIVE) && + !mddev->cluster_ops->resync_status_get(mddev)) { + /* + * -1 to make raid1_add_disk() set conf->fullsync + * to 1. This could avoid skipping sync when the + * remote node is down during resyncing. + */ + if ((le32_to_cpu(sb->feature_map) + & MD_FEATURE_RECOVERY_OFFSET)) + rdev2->saved_raid_disk = -1; + else + rdev2->saved_raid_disk = role; ret = remove_and_add_spares(mddev, rdev2); pr_info("Activated spare: %pg\n", rdev2->bdev); @@ -9898,7 +10753,7 @@ void md_autostart_arrays(int part) static __exit void md_exit(void) { - struct mddev *mddev, *n; + struct mddev *mddev; int delay = 1; unregister_blkdev(MD_MAJOR,"md"); @@ -9919,7 +10774,7 @@ static __exit void md_exit(void) remove_proc_entry("mdstat", NULL); spin_lock(&all_mddevs_lock); - list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) { + list_for_each_entry(mddev, &all_mddevs, all_mddevs) { if (!mddev_get(mddev)) continue; spin_unlock(&all_mddevs_lock); @@ -9931,14 +10786,14 @@ static __exit void md_exit(void) * the mddev for destruction by a workqueue, and the * destroy_workqueue() below will wait for that to complete. */ - mddev_put(mddev); spin_lock(&all_mddevs_lock); + mddev_put_locked(mddev); } spin_unlock(&all_mddevs_lock); - destroy_workqueue(md_rdev_misc_wq); destroy_workqueue(md_misc_wq); destroy_workqueue(md_wq); + md_bitmap_exit(); } subsys_initcall(md_init); @@ -9957,6 +10812,8 @@ module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); module_param(create_on_open, bool, S_IRUSR|S_IWUSR); +module_param(legacy_async_del_gendisk, bool, 0600); +module_param(check_new_feature, bool, 0600); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("MD RAID framework"); |